sctp_output.c

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/7.3/sys/netinet/sctp_output.c 202716 2010-01-20 19:20:31Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <sys/proc.h>
   38 #include <netinet/sctp_var.h>
   39 #include <netinet/sctp_sysctl.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_uio.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_bsd_addr.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/udp.h>
   53 #include <machine/in_cksum.h>
   54 
   55 
   56 
   57 #define SCTP_MAX_GAPS_INARRAY 4
   58 struct sack_track {
   59         uint8_t right_edge;     /* mergable on the right edge */
   60         uint8_t left_edge;      /* mergable on the left edge */
   61         uint8_t num_entries;
   62         uint8_t spare;
   63         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   64 };
   65 
   66 struct sack_track sack_array[256] = {
   67         {0, 0, 0, 0,            /* 0x00 */
   68                 {{0, 0},
   69                 {0, 0},
   70                 {0, 0},
   71                 {0, 0}
   72                 }
   73         },
   74         {1, 0, 1, 0,            /* 0x01 */
   75                 {{0, 0},
   76                 {0, 0},
   77                 {0, 0},
   78                 {0, 0}
   79                 }
   80         },
   81         {0, 0, 1, 0,            /* 0x02 */
   82                 {{1, 1},
   83                 {0, 0},
   84                 {0, 0},
   85                 {0, 0}
   86                 }
   87         },
   88         {1, 0, 1, 0,            /* 0x03 */
   89                 {{0, 1},
   90                 {0, 0},
   91                 {0, 0},
   92                 {0, 0}
   93                 }
   94         },
   95         {0, 0, 1, 0,            /* 0x04 */
   96                 {{2, 2},
   97                 {0, 0},
   98                 {0, 0},
   99                 {0, 0}
  100                 }
  101         },
  102         {1, 0, 2, 0,            /* 0x05 */
  103                 {{0, 0},
  104                 {2, 2},
  105                 {0, 0},
  106                 {0, 0}
  107                 }
  108         },
  109         {0, 0, 1, 0,            /* 0x06 */
  110                 {{1, 2},
  111                 {0, 0},
  112                 {0, 0},
  113                 {0, 0}
  114                 }
  115         },
  116         {1, 0, 1, 0,            /* 0x07 */
  117                 {{0, 2},
  118                 {0, 0},
  119                 {0, 0},
  120                 {0, 0}
  121                 }
  122         },
  123         {0, 0, 1, 0,            /* 0x08 */
  124                 {{3, 3},
  125                 {0, 0},
  126                 {0, 0},
  127                 {0, 0}
  128                 }
  129         },
  130         {1, 0, 2, 0,            /* 0x09 */
  131                 {{0, 0},
  132                 {3, 3},
  133                 {0, 0},
  134                 {0, 0}
  135                 }
  136         },
  137         {0, 0, 2, 0,            /* 0x0a */
  138                 {{1, 1},
  139                 {3, 3},
  140                 {0, 0},
  141                 {0, 0}
  142                 }
  143         },
  144         {1, 0, 2, 0,            /* 0x0b */
  145                 {{0, 1},
  146                 {3, 3},
  147                 {0, 0},
  148                 {0, 0}
  149                 }
  150         },
  151         {0, 0, 1, 0,            /* 0x0c */
  152                 {{2, 3},
  153                 {0, 0},
  154                 {0, 0},
  155                 {0, 0}
  156                 }
  157         },
  158         {1, 0, 2, 0,            /* 0x0d */
  159                 {{0, 0},
  160                 {2, 3},
  161                 {0, 0},
  162                 {0, 0}
  163                 }
  164         },
  165         {0, 0, 1, 0,            /* 0x0e */
  166                 {{1, 3},
  167                 {0, 0},
  168                 {0, 0},
  169                 {0, 0}
  170                 }
  171         },
  172         {1, 0, 1, 0,            /* 0x0f */
  173                 {{0, 3},
  174                 {0, 0},
  175                 {0, 0},
  176                 {0, 0}
  177                 }
  178         },
  179         {0, 0, 1, 0,            /* 0x10 */
  180                 {{4, 4},
  181                 {0, 0},
  182                 {0, 0},
  183                 {0, 0}
  184                 }
  185         },
  186         {1, 0, 2, 0,            /* 0x11 */
  187                 {{0, 0},
  188                 {4, 4},
  189                 {0, 0},
  190                 {0, 0}
  191                 }
  192         },
  193         {0, 0, 2, 0,            /* 0x12 */
  194                 {{1, 1},
  195                 {4, 4},
  196                 {0, 0},
  197                 {0, 0}
  198                 }
  199         },
  200         {1, 0, 2, 0,            /* 0x13 */
  201                 {{0, 1},
  202                 {4, 4},
  203                 {0, 0},
  204                 {0, 0}
  205                 }
  206         },
  207         {0, 0, 2, 0,            /* 0x14 */
  208                 {{2, 2},
  209                 {4, 4},
  210                 {0, 0},
  211                 {0, 0}
  212                 }
  213         },
  214         {1, 0, 3, 0,            /* 0x15 */
  215                 {{0, 0},
  216                 {2, 2},
  217                 {4, 4},
  218                 {0, 0}
  219                 }
  220         },
  221         {0, 0, 2, 0,            /* 0x16 */
  222                 {{1, 2},
  223                 {4, 4},
  224                 {0, 0},
  225                 {0, 0}
  226                 }
  227         },
  228         {1, 0, 2, 0,            /* 0x17 */
  229                 {{0, 2},
  230                 {4, 4},
  231                 {0, 0},
  232                 {0, 0}
  233                 }
  234         },
  235         {0, 0, 1, 0,            /* 0x18 */
  236                 {{3, 4},
  237                 {0, 0},
  238                 {0, 0},
  239                 {0, 0}
  240                 }
  241         },
  242         {1, 0, 2, 0,            /* 0x19 */
  243                 {{0, 0},
  244                 {3, 4},
  245                 {0, 0},
  246                 {0, 0}
  247                 }
  248         },
  249         {0, 0, 2, 0,            /* 0x1a */
  250                 {{1, 1},
  251                 {3, 4},
  252                 {0, 0},
  253                 {0, 0}
  254                 }
  255         },
  256         {1, 0, 2, 0,            /* 0x1b */
  257                 {{0, 1},
  258                 {3, 4},
  259                 {0, 0},
  260                 {0, 0}
  261                 }
  262         },
  263         {0, 0, 1, 0,            /* 0x1c */
  264                 {{2, 4},
  265                 {0, 0},
  266                 {0, 0},
  267                 {0, 0}
  268                 }
  269         },
  270         {1, 0, 2, 0,            /* 0x1d */
  271                 {{0, 0},
  272                 {2, 4},
  273                 {0, 0},
  274                 {0, 0}
  275                 }
  276         },
  277         {0, 0, 1, 0,            /* 0x1e */
  278                 {{1, 4},
  279                 {0, 0},
  280                 {0, 0},
  281                 {0, 0}
  282                 }
  283         },
  284         {1, 0, 1, 0,            /* 0x1f */
  285                 {{0, 4},
  286                 {0, 0},
  287                 {0, 0},
  288                 {0, 0}
  289                 }
  290         },
  291         {0, 0, 1, 0,            /* 0x20 */
  292                 {{5, 5},
  293                 {0, 0},
  294                 {0, 0},
  295                 {0, 0}
  296                 }
  297         },
  298         {1, 0, 2, 0,            /* 0x21 */
  299                 {{0, 0},
  300                 {5, 5},
  301                 {0, 0},
  302                 {0, 0}
  303                 }
  304         },
  305         {0, 0, 2, 0,            /* 0x22 */
  306                 {{1, 1},
  307                 {5, 5},
  308                 {0, 0},
  309                 {0, 0}
  310                 }
  311         },
  312         {1, 0, 2, 0,            /* 0x23 */
  313                 {{0, 1},
  314                 {5, 5},
  315                 {0, 0},
  316                 {0, 0}
  317                 }
  318         },
  319         {0, 0, 2, 0,            /* 0x24 */
  320                 {{2, 2},
  321                 {5, 5},
  322                 {0, 0},
  323                 {0, 0}
  324                 }
  325         },
  326         {1, 0, 3, 0,            /* 0x25 */
  327                 {{0, 0},
  328                 {2, 2},
  329                 {5, 5},
  330                 {0, 0}
  331                 }
  332         },
  333         {0, 0, 2, 0,            /* 0x26 */
  334                 {{1, 2},
  335                 {5, 5},
  336                 {0, 0},
  337                 {0, 0}
  338                 }
  339         },
  340         {1, 0, 2, 0,            /* 0x27 */
  341                 {{0, 2},
  342                 {5, 5},
  343                 {0, 0},
  344                 {0, 0}
  345                 }
  346         },
  347         {0, 0, 2, 0,            /* 0x28 */
  348                 {{3, 3},
  349                 {5, 5},
  350                 {0, 0},
  351                 {0, 0}
  352                 }
  353         },
  354         {1, 0, 3, 0,            /* 0x29 */
  355                 {{0, 0},
  356                 {3, 3},
  357                 {5, 5},
  358                 {0, 0}
  359                 }
  360         },
  361         {0, 0, 3, 0,            /* 0x2a */
  362                 {{1, 1},
  363                 {3, 3},
  364                 {5, 5},
  365                 {0, 0}
  366                 }
  367         },
  368         {1, 0, 3, 0,            /* 0x2b */
  369                 {{0, 1},
  370                 {3, 3},
  371                 {5, 5},
  372                 {0, 0}
  373                 }
  374         },
  375         {0, 0, 2, 0,            /* 0x2c */
  376                 {{2, 3},
  377                 {5, 5},
  378                 {0, 0},
  379                 {0, 0}
  380                 }
  381         },
  382         {1, 0, 3, 0,            /* 0x2d */
  383                 {{0, 0},
  384                 {2, 3},
  385                 {5, 5},
  386                 {0, 0}
  387                 }
  388         },
  389         {0, 0, 2, 0,            /* 0x2e */
  390                 {{1, 3},
  391                 {5, 5},
  392                 {0, 0},
  393                 {0, 0}
  394                 }
  395         },
  396         {1, 0, 2, 0,            /* 0x2f */
  397                 {{0, 3},
  398                 {5, 5},
  399                 {0, 0},
  400                 {0, 0}
  401                 }
  402         },
  403         {0, 0, 1, 0,            /* 0x30 */
  404                 {{4, 5},
  405                 {0, 0},
  406                 {0, 0},
  407                 {0, 0}
  408                 }
  409         },
  410         {1, 0, 2, 0,            /* 0x31 */
  411                 {{0, 0},
  412                 {4, 5},
  413                 {0, 0},
  414                 {0, 0}
  415                 }
  416         },
  417         {0, 0, 2, 0,            /* 0x32 */
  418                 {{1, 1},
  419                 {4, 5},
  420                 {0, 0},
  421                 {0, 0}
  422                 }
  423         },
  424         {1, 0, 2, 0,            /* 0x33 */
  425                 {{0, 1},
  426                 {4, 5},
  427                 {0, 0},
  428                 {0, 0}
  429                 }
  430         },
  431         {0, 0, 2, 0,            /* 0x34 */
  432                 {{2, 2},
  433                 {4, 5},
  434                 {0, 0},
  435                 {0, 0}
  436                 }
  437         },
  438         {1, 0, 3, 0,            /* 0x35 */
  439                 {{0, 0},
  440                 {2, 2},
  441                 {4, 5},
  442                 {0, 0}
  443                 }
  444         },
  445         {0, 0, 2, 0,            /* 0x36 */
  446                 {{1, 2},
  447                 {4, 5},
  448                 {0, 0},
  449                 {0, 0}
  450                 }
  451         },
  452         {1, 0, 2, 0,            /* 0x37 */
  453                 {{0, 2},
  454                 {4, 5},
  455                 {0, 0},
  456                 {0, 0}
  457                 }
  458         },
  459         {0, 0, 1, 0,            /* 0x38 */
  460                 {{3, 5},
  461                 {0, 0},
  462                 {0, 0},
  463                 {0, 0}
  464                 }
  465         },
  466         {1, 0, 2, 0,            /* 0x39 */
  467                 {{0, 0},
  468                 {3, 5},
  469                 {0, 0},
  470                 {0, 0}
  471                 }
  472         },
  473         {0, 0, 2, 0,            /* 0x3a */
  474                 {{1, 1},
  475                 {3, 5},
  476                 {0, 0},
  477                 {0, 0}
  478                 }
  479         },
  480         {1, 0, 2, 0,            /* 0x3b */
  481                 {{0, 1},
  482                 {3, 5},
  483                 {0, 0},
  484                 {0, 0}
  485                 }
  486         },
  487         {0, 0, 1, 0,            /* 0x3c */
  488                 {{2, 5},
  489                 {0, 0},
  490                 {0, 0},
  491                 {0, 0}
  492                 }
  493         },
  494         {1, 0, 2, 0,            /* 0x3d */
  495                 {{0, 0},
  496                 {2, 5},
  497                 {0, 0},
  498                 {0, 0}
  499                 }
  500         },
  501         {0, 0, 1, 0,            /* 0x3e */
  502                 {{1, 5},
  503                 {0, 0},
  504                 {0, 0},
  505                 {0, 0}
  506                 }
  507         },
  508         {1, 0, 1, 0,            /* 0x3f */
  509                 {{0, 5},
  510                 {0, 0},
  511                 {0, 0},
  512                 {0, 0}
  513                 }
  514         },
  515         {0, 0, 1, 0,            /* 0x40 */
  516                 {{6, 6},
  517                 {0, 0},
  518                 {0, 0},
  519                 {0, 0}
  520                 }
  521         },
  522         {1, 0, 2, 0,            /* 0x41 */
  523                 {{0, 0},
  524                 {6, 6},
  525                 {0, 0},
  526                 {0, 0}
  527                 }
  528         },
  529         {0, 0, 2, 0,            /* 0x42 */
  530                 {{1, 1},
  531                 {6, 6},
  532                 {0, 0},
  533                 {0, 0}
  534                 }
  535         },
  536         {1, 0, 2, 0,            /* 0x43 */
  537                 {{0, 1},
  538                 {6, 6},
  539                 {0, 0},
  540                 {0, 0}
  541                 }
  542         },
  543         {0, 0, 2, 0,            /* 0x44 */
  544                 {{2, 2},
  545                 {6, 6},
  546                 {0, 0},
  547                 {0, 0}
  548                 }
  549         },
  550         {1, 0, 3, 0,            /* 0x45 */
  551                 {{0, 0},
  552                 {2, 2},
  553                 {6, 6},
  554                 {0, 0}
  555                 }
  556         },
  557         {0, 0, 2, 0,            /* 0x46 */
  558                 {{1, 2},
  559                 {6, 6},
  560                 {0, 0},
  561                 {0, 0}
  562                 }
  563         },
  564         {1, 0, 2, 0,            /* 0x47 */
  565                 {{0, 2},
  566                 {6, 6},
  567                 {0, 0},
  568                 {0, 0}
  569                 }
  570         },
  571         {0, 0, 2, 0,            /* 0x48 */
  572                 {{3, 3},
  573                 {6, 6},
  574                 {0, 0},
  575                 {0, 0}
  576                 }
  577         },
  578         {1, 0, 3, 0,            /* 0x49 */
  579                 {{0, 0},
  580                 {3, 3},
  581                 {6, 6},
  582                 {0, 0}
  583                 }
  584         },
  585         {0, 0, 3, 0,            /* 0x4a */
  586                 {{1, 1},
  587                 {3, 3},
  588                 {6, 6},
  589                 {0, 0}
  590                 }
  591         },
  592         {1, 0, 3, 0,            /* 0x4b */
  593                 {{0, 1},
  594                 {3, 3},
  595                 {6, 6},
  596                 {0, 0}
  597                 }
  598         },
  599         {0, 0, 2, 0,            /* 0x4c */
  600                 {{2, 3},
  601                 {6, 6},
  602                 {0, 0},
  603                 {0, 0}
  604                 }
  605         },
  606         {1, 0, 3, 0,            /* 0x4d */
  607                 {{0, 0},
  608                 {2, 3},
  609                 {6, 6},
  610                 {0, 0}
  611                 }
  612         },
  613         {0, 0, 2, 0,            /* 0x4e */
  614                 {{1, 3},
  615                 {6, 6},
  616                 {0, 0},
  617                 {0, 0}
  618                 }
  619         },
  620         {1, 0, 2, 0,            /* 0x4f */
  621                 {{0, 3},
  622                 {6, 6},
  623                 {0, 0},
  624                 {0, 0}
  625                 }
  626         },
  627         {0, 0, 2, 0,            /* 0x50 */
  628                 {{4, 4},
  629                 {6, 6},
  630                 {0, 0},
  631                 {0, 0}
  632                 }
  633         },
  634         {1, 0, 3, 0,            /* 0x51 */
  635                 {{0, 0},
  636                 {4, 4},
  637                 {6, 6},
  638                 {0, 0}
  639                 }
  640         },
  641         {0, 0, 3, 0,            /* 0x52 */
  642                 {{1, 1},
  643                 {4, 4},
  644                 {6, 6},
  645                 {0, 0}
  646                 }
  647         },
  648         {1, 0, 3, 0,            /* 0x53 */
  649                 {{0, 1},
  650                 {4, 4},
  651                 {6, 6},
  652                 {0, 0}
  653                 }
  654         },
  655         {0, 0, 3, 0,            /* 0x54 */
  656                 {{2, 2},
  657                 {4, 4},
  658                 {6, 6},
  659                 {0, 0}
  660                 }
  661         },
  662         {1, 0, 4, 0,            /* 0x55 */
  663                 {{0, 0},
  664                 {2, 2},
  665                 {4, 4},
  666                 {6, 6}
  667                 }
  668         },
  669         {0, 0, 3, 0,            /* 0x56 */
  670                 {{1, 2},
  671                 {4, 4},
  672                 {6, 6},
  673                 {0, 0}
  674                 }
  675         },
  676         {1, 0, 3, 0,            /* 0x57 */
  677                 {{0, 2},
  678                 {4, 4},
  679                 {6, 6},
  680                 {0, 0}
  681                 }
  682         },
  683         {0, 0, 2, 0,            /* 0x58 */
  684                 {{3, 4},
  685                 {6, 6},
  686                 {0, 0},
  687                 {0, 0}
  688                 }
  689         },
  690         {1, 0, 3, 0,            /* 0x59 */
  691                 {{0, 0},
  692                 {3, 4},
  693                 {6, 6},
  694                 {0, 0}
  695                 }
  696         },
  697         {0, 0, 3, 0,            /* 0x5a */
  698                 {{1, 1},
  699                 {3, 4},
  700                 {6, 6},
  701                 {0, 0}
  702                 }
  703         },
  704         {1, 0, 3, 0,            /* 0x5b */
  705                 {{0, 1},
  706                 {3, 4},
  707                 {6, 6},
  708                 {0, 0}
  709                 }
  710         },
  711         {0, 0, 2, 0,            /* 0x5c */
  712                 {{2, 4},
  713                 {6, 6},
  714                 {0, 0},
  715                 {0, 0}
  716                 }
  717         },
  718         {1, 0, 3, 0,            /* 0x5d */
  719                 {{0, 0},
  720                 {2, 4},
  721                 {6, 6},
  722                 {0, 0}
  723                 }
  724         },
  725         {0, 0, 2, 0,            /* 0x5e */
  726                 {{1, 4},
  727                 {6, 6},
  728                 {0, 0},
  729                 {0, 0}
  730                 }
  731         },
  732         {1, 0, 2, 0,            /* 0x5f */
  733                 {{0, 4},
  734                 {6, 6},
  735                 {0, 0},
  736                 {0, 0}
  737                 }
  738         },
  739         {0, 0, 1, 0,            /* 0x60 */
  740                 {{5, 6},
  741                 {0, 0},
  742                 {0, 0},
  743                 {0, 0}
  744                 }
  745         },
  746         {1, 0, 2, 0,            /* 0x61 */
  747                 {{0, 0},
  748                 {5, 6},
  749                 {0, 0},
  750                 {0, 0}
  751                 }
  752         },
  753         {0, 0, 2, 0,            /* 0x62 */
  754                 {{1, 1},
  755                 {5, 6},
  756                 {0, 0},
  757                 {0, 0}
  758                 }
  759         },
  760         {1, 0, 2, 0,            /* 0x63 */
  761                 {{0, 1},
  762                 {5, 6},
  763                 {0, 0},
  764                 {0, 0}
  765                 }
  766         },
  767         {0, 0, 2, 0,            /* 0x64 */
  768                 {{2, 2},
  769                 {5, 6},
  770                 {0, 0},
  771                 {0, 0}
  772                 }
  773         },
  774         {1, 0, 3, 0,            /* 0x65 */
  775                 {{0, 0},
  776                 {2, 2},
  777                 {5, 6},
  778                 {0, 0}
  779                 }
  780         },
  781         {0, 0, 2, 0,            /* 0x66 */
  782                 {{1, 2},
  783                 {5, 6},
  784                 {0, 0},
  785                 {0, 0}
  786                 }
  787         },
  788         {1, 0, 2, 0,            /* 0x67 */
  789                 {{0, 2},
  790                 {5, 6},
  791                 {0, 0},
  792                 {0, 0}
  793                 }
  794         },
  795         {0, 0, 2, 0,            /* 0x68 */
  796                 {{3, 3},
  797                 {5, 6},
  798                 {0, 0},
  799                 {0, 0}
  800                 }
  801         },
  802         {1, 0, 3, 0,            /* 0x69 */
  803                 {{0, 0},
  804                 {3, 3},
  805                 {5, 6},
  806                 {0, 0}
  807                 }
  808         },
  809         {0, 0, 3, 0,            /* 0x6a */
  810                 {{1, 1},
  811                 {3, 3},
  812                 {5, 6},
  813                 {0, 0}
  814                 }
  815         },
  816         {1, 0, 3, 0,            /* 0x6b */
  817                 {{0, 1},
  818                 {3, 3},
  819                 {5, 6},
  820                 {0, 0}
  821                 }
  822         },
  823         {0, 0, 2, 0,            /* 0x6c */
  824                 {{2, 3},
  825                 {5, 6},
  826                 {0, 0},
  827                 {0, 0}
  828                 }
  829         },
  830         {1, 0, 3, 0,            /* 0x6d */
  831                 {{0, 0},
  832                 {2, 3},
  833                 {5, 6},
  834                 {0, 0}
  835                 }
  836         },
  837         {0, 0, 2, 0,            /* 0x6e */
  838                 {{1, 3},
  839                 {5, 6},
  840                 {0, 0},
  841                 {0, 0}
  842                 }
  843         },
  844         {1, 0, 2, 0,            /* 0x6f */
  845                 {{0, 3},
  846                 {5, 6},
  847                 {0, 0},
  848                 {0, 0}
  849                 }
  850         },
  851         {0, 0, 1, 0,            /* 0x70 */
  852                 {{4, 6},
  853                 {0, 0},
  854                 {0, 0},
  855                 {0, 0}
  856                 }
  857         },
  858         {1, 0, 2, 0,            /* 0x71 */
  859                 {{0, 0},
  860                 {4, 6},
  861                 {0, 0},
  862                 {0, 0}
  863                 }
  864         },
  865         {0, 0, 2, 0,            /* 0x72 */
  866                 {{1, 1},
  867                 {4, 6},
  868                 {0, 0},
  869                 {0, 0}
  870                 }
  871         },
  872         {1, 0, 2, 0,            /* 0x73 */
  873                 {{0, 1},
  874                 {4, 6},
  875                 {0, 0},
  876                 {0, 0}
  877                 }
  878         },
  879         {0, 0, 2, 0,            /* 0x74 */
  880                 {{2, 2},
  881                 {4, 6},
  882                 {0, 0},
  883                 {0, 0}
  884                 }
  885         },
  886         {1, 0, 3, 0,            /* 0x75 */
  887                 {{0, 0},
  888                 {2, 2},
  889                 {4, 6},
  890                 {0, 0}
  891                 }
  892         },
  893         {0, 0, 2, 0,            /* 0x76 */
  894                 {{1, 2},
  895                 {4, 6},
  896                 {0, 0},
  897                 {0, 0}
  898                 }
  899         },
  900         {1, 0, 2, 0,            /* 0x77 */
  901                 {{0, 2},
  902                 {4, 6},
  903                 {0, 0},
  904                 {0, 0}
  905                 }
  906         },
  907         {0, 0, 1, 0,            /* 0x78 */
  908                 {{3, 6},
  909                 {0, 0},
  910                 {0, 0},
  911                 {0, 0}
  912                 }
  913         },
  914         {1, 0, 2, 0,            /* 0x79 */
  915                 {{0, 0},
  916                 {3, 6},
  917                 {0, 0},
  918                 {0, 0}
  919                 }
  920         },
  921         {0, 0, 2, 0,            /* 0x7a */
  922                 {{1, 1},
  923                 {3, 6},
  924                 {0, 0},
  925                 {0, 0}
  926                 }
  927         },
  928         {1, 0, 2, 0,            /* 0x7b */
  929                 {{0, 1},
  930                 {3, 6},
  931                 {0, 0},
  932                 {0, 0}
  933                 }
  934         },
  935         {0, 0, 1, 0,            /* 0x7c */
  936                 {{2, 6},
  937                 {0, 0},
  938                 {0, 0},
  939                 {0, 0}
  940                 }
  941         },
  942         {1, 0, 2, 0,            /* 0x7d */
  943                 {{0, 0},
  944                 {2, 6},
  945                 {0, 0},
  946                 {0, 0}
  947                 }
  948         },
  949         {0, 0, 1, 0,            /* 0x7e */
  950                 {{1, 6},
  951                 {0, 0},
  952                 {0, 0},
  953                 {0, 0}
  954                 }
  955         },
  956         {1, 0, 1, 0,            /* 0x7f */
  957                 {{0, 6},
  958                 {0, 0},
  959                 {0, 0},
  960                 {0, 0}
  961                 }
  962         },
  963         {0, 1, 1, 0,            /* 0x80 */
  964                 {{7, 7},
  965                 {0, 0},
  966                 {0, 0},
  967                 {0, 0}
  968                 }
  969         },
  970         {1, 1, 2, 0,            /* 0x81 */
  971                 {{0, 0},
  972                 {7, 7},
  973                 {0, 0},
  974                 {0, 0}
  975                 }
  976         },
  977         {0, 1, 2, 0,            /* 0x82 */
  978                 {{1, 1},
  979                 {7, 7},
  980                 {0, 0},
  981                 {0, 0}
  982                 }
  983         },
  984         {1, 1, 2, 0,            /* 0x83 */
  985                 {{0, 1},
  986                 {7, 7},
  987                 {0, 0},
  988                 {0, 0}
  989                 }
  990         },
  991         {0, 1, 2, 0,            /* 0x84 */
  992                 {{2, 2},
  993                 {7, 7},
  994                 {0, 0},
  995                 {0, 0}
  996                 }
  997         },
  998         {1, 1, 3, 0,            /* 0x85 */
  999                 {{0, 0},
 1000                 {2, 2},
 1001                 {7, 7},
 1002                 {0, 0}
 1003                 }
 1004         },
 1005         {0, 1, 2, 0,            /* 0x86 */
 1006                 {{1, 2},
 1007                 {7, 7},
 1008                 {0, 0},
 1009                 {0, 0}
 1010                 }
 1011         },
 1012         {1, 1, 2, 0,            /* 0x87 */
 1013                 {{0, 2},
 1014                 {7, 7},
 1015                 {0, 0},
 1016                 {0, 0}
 1017                 }
 1018         },
 1019         {0, 1, 2, 0,            /* 0x88 */
 1020                 {{3, 3},
 1021                 {7, 7},
 1022                 {0, 0},
 1023                 {0, 0}
 1024                 }
 1025         },
 1026         {1, 1, 3, 0,            /* 0x89 */
 1027                 {{0, 0},
 1028                 {3, 3},
 1029                 {7, 7},
 1030                 {0, 0}
 1031                 }
 1032         },
 1033         {0, 1, 3, 0,            /* 0x8a */
 1034                 {{1, 1},
 1035                 {3, 3},
 1036                 {7, 7},
 1037                 {0, 0}
 1038                 }
 1039         },
 1040         {1, 1, 3, 0,            /* 0x8b */
 1041                 {{0, 1},
 1042                 {3, 3},
 1043                 {7, 7},
 1044                 {0, 0}
 1045                 }
 1046         },
 1047         {0, 1, 2, 0,            /* 0x8c */
 1048                 {{2, 3},
 1049                 {7, 7},
 1050                 {0, 0},
 1051                 {0, 0}
 1052                 }
 1053         },
 1054         {1, 1, 3, 0,            /* 0x8d */
 1055                 {{0, 0},
 1056                 {2, 3},
 1057                 {7, 7},
 1058                 {0, 0}
 1059                 }
 1060         },
 1061         {0, 1, 2, 0,            /* 0x8e */
 1062                 {{1, 3},
 1063                 {7, 7},
 1064                 {0, 0},
 1065                 {0, 0}
 1066                 }
 1067         },
 1068         {1, 1, 2, 0,            /* 0x8f */
 1069                 {{0, 3},
 1070                 {7, 7},
 1071                 {0, 0},
 1072                 {0, 0}
 1073                 }
 1074         },
 1075         {0, 1, 2, 0,            /* 0x90 */
 1076                 {{4, 4},
 1077                 {7, 7},
 1078                 {0, 0},
 1079                 {0, 0}
 1080                 }
 1081         },
 1082         {1, 1, 3, 0,            /* 0x91 */
 1083                 {{0, 0},
 1084                 {4, 4},
 1085                 {7, 7},
 1086                 {0, 0}
 1087                 }
 1088         },
 1089         {0, 1, 3, 0,            /* 0x92 */
 1090                 {{1, 1},
 1091                 {4, 4},
 1092                 {7, 7},
 1093                 {0, 0}
 1094                 }
 1095         },
 1096         {1, 1, 3, 0,            /* 0x93 */
 1097                 {{0, 1},
 1098                 {4, 4},
 1099                 {7, 7},
 1100                 {0, 0}
 1101                 }
 1102         },
 1103         {0, 1, 3, 0,            /* 0x94 */
 1104                 {{2, 2},
 1105                 {4, 4},
 1106                 {7, 7},
 1107                 {0, 0}
 1108                 }
 1109         },
 1110         {1, 1, 4, 0,            /* 0x95 */
 1111                 {{0, 0},
 1112                 {2, 2},
 1113                 {4, 4},
 1114                 {7, 7}
 1115                 }
 1116         },
 1117         {0, 1, 3, 0,            /* 0x96 */
 1118                 {{1, 2},
 1119                 {4, 4},
 1120                 {7, 7},
 1121                 {0, 0}
 1122                 }
 1123         },
 1124         {1, 1, 3, 0,            /* 0x97 */
 1125                 {{0, 2},
 1126                 {4, 4},
 1127                 {7, 7},
 1128                 {0, 0}
 1129                 }
 1130         },
 1131         {0, 1, 2, 0,            /* 0x98 */
 1132                 {{3, 4},
 1133                 {7, 7},
 1134                 {0, 0},
 1135                 {0, 0}
 1136                 }
 1137         },
 1138         {1, 1, 3, 0,            /* 0x99 */
 1139                 {{0, 0},
 1140                 {3, 4},
 1141                 {7, 7},
 1142                 {0, 0}
 1143                 }
 1144         },
 1145         {0, 1, 3, 0,            /* 0x9a */
 1146                 {{1, 1},
 1147                 {3, 4},
 1148                 {7, 7},
 1149                 {0, 0}
 1150                 }
 1151         },
 1152         {1, 1, 3, 0,            /* 0x9b */
 1153                 {{0, 1},
 1154                 {3, 4},
 1155                 {7, 7},
 1156                 {0, 0}
 1157                 }
 1158         },
 1159         {0, 1, 2, 0,            /* 0x9c */
 1160                 {{2, 4},
 1161                 {7, 7},
 1162                 {0, 0},
 1163                 {0, 0}
 1164                 }
 1165         },
 1166         {1, 1, 3, 0,            /* 0x9d */
 1167                 {{0, 0},
 1168                 {2, 4},
 1169                 {7, 7},
 1170                 {0, 0}
 1171                 }
 1172         },
 1173         {0, 1, 2, 0,            /* 0x9e */
 1174                 {{1, 4},
 1175                 {7, 7},
 1176                 {0, 0},
 1177                 {0, 0}
 1178                 }
 1179         },
 1180         {1, 1, 2, 0,            /* 0x9f */
 1181                 {{0, 4},
 1182                 {7, 7},
 1183                 {0, 0},
 1184                 {0, 0}
 1185                 }
 1186         },
 1187         {0, 1, 2, 0,            /* 0xa0 */
 1188                 {{5, 5},
 1189                 {7, 7},
 1190                 {0, 0},
 1191                 {0, 0}
 1192                 }
 1193         },
 1194         {1, 1, 3, 0,            /* 0xa1 */
 1195                 {{0, 0},
 1196                 {5, 5},
 1197                 {7, 7},
 1198                 {0, 0}
 1199                 }
 1200         },
 1201         {0, 1, 3, 0,            /* 0xa2 */
 1202                 {{1, 1},
 1203                 {5, 5},
 1204                 {7, 7},
 1205                 {0, 0}
 1206                 }
 1207         },
 1208         {1, 1, 3, 0,            /* 0xa3 */
 1209                 {{0, 1},
 1210                 {5, 5},
 1211                 {7, 7},
 1212                 {0, 0}
 1213                 }
 1214         },
 1215         {0, 1, 3, 0,            /* 0xa4 */
 1216                 {{2, 2},
 1217                 {5, 5},
 1218                 {7, 7},
 1219                 {0, 0}
 1220                 }
 1221         },
 1222         {1, 1, 4, 0,            /* 0xa5 */
 1223                 {{0, 0},
 1224                 {2, 2},
 1225                 {5, 5},
 1226                 {7, 7}
 1227                 }
 1228         },
 1229         {0, 1, 3, 0,            /* 0xa6 */
 1230                 {{1, 2},
 1231                 {5, 5},
 1232                 {7, 7},
 1233                 {0, 0}
 1234                 }
 1235         },
 1236         {1, 1, 3, 0,            /* 0xa7 */
 1237                 {{0, 2},
 1238                 {5, 5},
 1239                 {7, 7},
 1240                 {0, 0}
 1241                 }
 1242         },
 1243         {0, 1, 3, 0,            /* 0xa8 */
 1244                 {{3, 3},
 1245                 {5, 5},
 1246                 {7, 7},
 1247                 {0, 0}
 1248                 }
 1249         },
 1250         {1, 1, 4, 0,            /* 0xa9 */
 1251                 {{0, 0},
 1252                 {3, 3},
 1253                 {5, 5},
 1254                 {7, 7}
 1255                 }
 1256         },
 1257         {0, 1, 4, 0,            /* 0xaa */
 1258                 {{1, 1},
 1259                 {3, 3},
 1260                 {5, 5},
 1261                 {7, 7}
 1262                 }
 1263         },
 1264         {1, 1, 4, 0,            /* 0xab */
 1265                 {{0, 1},
 1266                 {3, 3},
 1267                 {5, 5},
 1268                 {7, 7}
 1269                 }
 1270         },
 1271         {0, 1, 3, 0,            /* 0xac */
 1272                 {{2, 3},
 1273                 {5, 5},
 1274                 {7, 7},
 1275                 {0, 0}
 1276                 }
 1277         },
 1278         {1, 1, 4, 0,            /* 0xad */
 1279                 {{0, 0},
 1280                 {2, 3},
 1281                 {5, 5},
 1282                 {7, 7}
 1283                 }
 1284         },
 1285         {0, 1, 3, 0,            /* 0xae */
 1286                 {{1, 3},
 1287                 {5, 5},
 1288                 {7, 7},
 1289                 {0, 0}
 1290                 }
 1291         },
 1292         {1, 1, 3, 0,            /* 0xaf */
 1293                 {{0, 3},
 1294                 {5, 5},
 1295                 {7, 7},
 1296                 {0, 0}
 1297                 }
 1298         },
 1299         {0, 1, 2, 0,            /* 0xb0 */
 1300                 {{4, 5},
 1301                 {7, 7},
 1302                 {0, 0},
 1303                 {0, 0}
 1304                 }
 1305         },
 1306         {1, 1, 3, 0,            /* 0xb1 */
 1307                 {{0, 0},
 1308                 {4, 5},
 1309                 {7, 7},
 1310                 {0, 0}
 1311                 }
 1312         },
 1313         {0, 1, 3, 0,            /* 0xb2 */
 1314                 {{1, 1},
 1315                 {4, 5},
 1316                 {7, 7},
 1317                 {0, 0}
 1318                 }
 1319         },
 1320         {1, 1, 3, 0,            /* 0xb3 */
 1321                 {{0, 1},
 1322                 {4, 5},
 1323                 {7, 7},
 1324                 {0, 0}
 1325                 }
 1326         },
 1327         {0, 1, 3, 0,            /* 0xb4 */
 1328                 {{2, 2},
 1329                 {4, 5},
 1330                 {7, 7},
 1331                 {0, 0}
 1332                 }
 1333         },
 1334         {1, 1, 4, 0,            /* 0xb5 */
 1335                 {{0, 0},
 1336                 {2, 2},
 1337                 {4, 5},
 1338                 {7, 7}
 1339                 }
 1340         },
 1341         {0, 1, 3, 0,            /* 0xb6 */
 1342                 {{1, 2},
 1343                 {4, 5},
 1344                 {7, 7},
 1345                 {0, 0}
 1346                 }
 1347         },
 1348         {1, 1, 3, 0,            /* 0xb7 */
 1349                 {{0, 2},
 1350                 {4, 5},
 1351                 {7, 7},
 1352                 {0, 0}
 1353                 }
 1354         },
 1355         {0, 1, 2, 0,            /* 0xb8 */
 1356                 {{3, 5},
 1357                 {7, 7},
 1358                 {0, 0},
 1359                 {0, 0}
 1360                 }
 1361         },
 1362         {1, 1, 3, 0,            /* 0xb9 */
 1363                 {{0, 0},
 1364                 {3, 5},
 1365                 {7, 7},
 1366                 {0, 0}
 1367                 }
 1368         },
 1369         {0, 1, 3, 0,            /* 0xba */
 1370                 {{1, 1},
 1371                 {3, 5},
 1372                 {7, 7},
 1373                 {0, 0}
 1374                 }
 1375         },
 1376         {1, 1, 3, 0,            /* 0xbb */
 1377                 {{0, 1},
 1378                 {3, 5},
 1379                 {7, 7},
 1380                 {0, 0}
 1381                 }
 1382         },
 1383         {0, 1, 2, 0,            /* 0xbc */
 1384                 {{2, 5},
 1385                 {7, 7},
 1386                 {0, 0},
 1387                 {0, 0}
 1388                 }
 1389         },
 1390         {1, 1, 3, 0,            /* 0xbd */
 1391                 {{0, 0},
 1392                 {2, 5},
 1393                 {7, 7},
 1394                 {0, 0}
 1395                 }
 1396         },
 1397         {0, 1, 2, 0,            /* 0xbe */
 1398                 {{1, 5},
 1399                 {7, 7},
 1400                 {0, 0},
 1401                 {0, 0}
 1402                 }
 1403         },
 1404         {1, 1, 2, 0,            /* 0xbf */
 1405                 {{0, 5},
 1406                 {7, 7},
 1407                 {0, 0},
 1408                 {0, 0}
 1409                 }
 1410         },
 1411         {0, 1, 1, 0,            /* 0xc0 */
 1412                 {{6, 7},
 1413                 {0, 0},
 1414                 {0, 0},
 1415                 {0, 0}
 1416                 }
 1417         },
 1418         {1, 1, 2, 0,            /* 0xc1 */
 1419                 {{0, 0},
 1420                 {6, 7},
 1421                 {0, 0},
 1422                 {0, 0}
 1423                 }
 1424         },
 1425         {0, 1, 2, 0,            /* 0xc2 */
 1426                 {{1, 1},
 1427                 {6, 7},
 1428                 {0, 0},
 1429                 {0, 0}
 1430                 }
 1431         },
 1432         {1, 1, 2, 0,            /* 0xc3 */
 1433                 {{0, 1},
 1434                 {6, 7},
 1435                 {0, 0},
 1436                 {0, 0}
 1437                 }
 1438         },
 1439         {0, 1, 2, 0,            /* 0xc4 */
 1440                 {{2, 2},
 1441                 {6, 7},
 1442                 {0, 0},
 1443                 {0, 0}
 1444                 }
 1445         },
 1446         {1, 1, 3, 0,            /* 0xc5 */
 1447                 {{0, 0},
 1448                 {2, 2},
 1449                 {6, 7},
 1450                 {0, 0}
 1451                 }
 1452         },
 1453         {0, 1, 2, 0,            /* 0xc6 */
 1454                 {{1, 2},
 1455                 {6, 7},
 1456                 {0, 0},
 1457                 {0, 0}
 1458                 }
 1459         },
 1460         {1, 1, 2, 0,            /* 0xc7 */
 1461                 {{0, 2},
 1462                 {6, 7},
 1463                 {0, 0},
 1464                 {0, 0}
 1465                 }
 1466         },
 1467         {0, 1, 2, 0,            /* 0xc8 */
 1468                 {{3, 3},
 1469                 {6, 7},
 1470                 {0, 0},
 1471                 {0, 0}
 1472                 }
 1473         },
 1474         {1, 1, 3, 0,            /* 0xc9 */
 1475                 {{0, 0},
 1476                 {3, 3},
 1477                 {6, 7},
 1478                 {0, 0}
 1479                 }
 1480         },
 1481         {0, 1, 3, 0,            /* 0xca */
 1482                 {{1, 1},
 1483                 {3, 3},
 1484                 {6, 7},
 1485                 {0, 0}
 1486                 }
 1487         },
 1488         {1, 1, 3, 0,            /* 0xcb */
 1489                 {{0, 1},
 1490                 {3, 3},
 1491                 {6, 7},
 1492                 {0, 0}
 1493                 }
 1494         },
 1495         {0, 1, 2, 0,            /* 0xcc */
 1496                 {{2, 3},
 1497                 {6, 7},
 1498                 {0, 0},
 1499                 {0, 0}
 1500                 }
 1501         },
 1502         {1, 1, 3, 0,            /* 0xcd */
 1503                 {{0, 0},
 1504                 {2, 3},
 1505                 {6, 7},
 1506                 {0, 0}
 1507                 }
 1508         },
 1509         {0, 1, 2, 0,            /* 0xce */
 1510                 {{1, 3},
 1511                 {6, 7},
 1512                 {0, 0},
 1513                 {0, 0}
 1514                 }
 1515         },
 1516         {1, 1, 2, 0,            /* 0xcf */
 1517                 {{0, 3},
 1518                 {6, 7},
 1519                 {0, 0},
 1520                 {0, 0}
 1521                 }
 1522         },
 1523         {0, 1, 2, 0,            /* 0xd0 */
 1524                 {{4, 4},
 1525                 {6, 7},
 1526                 {0, 0},
 1527                 {0, 0}
 1528                 }
 1529         },
 1530         {1, 1, 3, 0,            /* 0xd1 */
 1531                 {{0, 0},
 1532                 {4, 4},
 1533                 {6, 7},
 1534                 {0, 0}
 1535                 }
 1536         },
 1537         {0, 1, 3, 0,            /* 0xd2 */
 1538                 {{1, 1},
 1539                 {4, 4},
 1540                 {6, 7},
 1541                 {0, 0}
 1542                 }
 1543         },
 1544         {1, 1, 3, 0,            /* 0xd3 */
 1545                 {{0, 1},
 1546                 {4, 4},
 1547                 {6, 7},
 1548                 {0, 0}
 1549                 }
 1550         },
 1551         {0, 1, 3, 0,            /* 0xd4 */
 1552                 {{2, 2},
 1553                 {4, 4},
 1554                 {6, 7},
 1555                 {0, 0}
 1556                 }
 1557         },
 1558         {1, 1, 4, 0,            /* 0xd5 */
 1559                 {{0, 0},
 1560                 {2, 2},
 1561                 {4, 4},
 1562                 {6, 7}
 1563                 }
 1564         },
 1565         {0, 1, 3, 0,            /* 0xd6 */
 1566                 {{1, 2},
 1567                 {4, 4},
 1568                 {6, 7},
 1569                 {0, 0}
 1570                 }
 1571         },
 1572         {1, 1, 3, 0,            /* 0xd7 */
 1573                 {{0, 2},
 1574                 {4, 4},
 1575                 {6, 7},
 1576                 {0, 0}
 1577                 }
 1578         },
 1579         {0, 1, 2, 0,            /* 0xd8 */
 1580                 {{3, 4},
 1581                 {6, 7},
 1582                 {0, 0},
 1583                 {0, 0}
 1584                 }
 1585         },
 1586         {1, 1, 3, 0,            /* 0xd9 */
 1587                 {{0, 0},
 1588                 {3, 4},
 1589                 {6, 7},
 1590                 {0, 0}
 1591                 }
 1592         },
 1593         {0, 1, 3, 0,            /* 0xda */
 1594                 {{1, 1},
 1595                 {3, 4},
 1596                 {6, 7},
 1597                 {0, 0}
 1598                 }
 1599         },
 1600         {1, 1, 3, 0,            /* 0xdb */
 1601                 {{0, 1},
 1602                 {3, 4},
 1603                 {6, 7},
 1604                 {0, 0}
 1605                 }
 1606         },
 1607         {0, 1, 2, 0,            /* 0xdc */
 1608                 {{2, 4},
 1609                 {6, 7},
 1610                 {0, 0},
 1611                 {0, 0}
 1612                 }
 1613         },
 1614         {1, 1, 3, 0,            /* 0xdd */
 1615                 {{0, 0},
 1616                 {2, 4},
 1617                 {6, 7},
 1618                 {0, 0}
 1619                 }
 1620         },
 1621         {0, 1, 2, 0,            /* 0xde */
 1622                 {{1, 4},
 1623                 {6, 7},
 1624                 {0, 0},
 1625                 {0, 0}
 1626                 }
 1627         },
 1628         {1, 1, 2, 0,            /* 0xdf */
 1629                 {{0, 4},
 1630                 {6, 7},
 1631                 {0, 0},
 1632                 {0, 0}
 1633                 }
 1634         },
 1635         {0, 1, 1, 0,            /* 0xe0 */
 1636                 {{5, 7},
 1637                 {0, 0},
 1638                 {0, 0},
 1639                 {0, 0}
 1640                 }
 1641         },
 1642         {1, 1, 2, 0,            /* 0xe1 */
 1643                 {{0, 0},
 1644                 {5, 7},
 1645                 {0, 0},
 1646                 {0, 0}
 1647                 }
 1648         },
 1649         {0, 1, 2, 0,            /* 0xe2 */
 1650                 {{1, 1},
 1651                 {5, 7},
 1652                 {0, 0},
 1653                 {0, 0}
 1654                 }
 1655         },
 1656         {1, 1, 2, 0,            /* 0xe3 */
 1657                 {{0, 1},
 1658                 {5, 7},
 1659                 {0, 0},
 1660                 {0, 0}
 1661                 }
 1662         },
 1663         {0, 1, 2, 0,            /* 0xe4 */
 1664                 {{2, 2},
 1665                 {5, 7},
 1666                 {0, 0},
 1667                 {0, 0}
 1668                 }
 1669         },
 1670         {1, 1, 3, 0,            /* 0xe5 */
 1671                 {{0, 0},
 1672                 {2, 2},
 1673                 {5, 7},
 1674                 {0, 0}
 1675                 }
 1676         },
 1677         {0, 1, 2, 0,            /* 0xe6 */
 1678                 {{1, 2},
 1679                 {5, 7},
 1680                 {0, 0},
 1681                 {0, 0}
 1682                 }
 1683         },
 1684         {1, 1, 2, 0,            /* 0xe7 */
 1685                 {{0, 2},
 1686                 {5, 7},
 1687                 {0, 0},
 1688                 {0, 0}
 1689                 }
 1690         },
 1691         {0, 1, 2, 0,            /* 0xe8 */
 1692                 {{3, 3},
 1693                 {5, 7},
 1694                 {0, 0},
 1695                 {0, 0}
 1696                 }
 1697         },
 1698         {1, 1, 3, 0,            /* 0xe9 */
 1699                 {{0, 0},
 1700                 {3, 3},
 1701                 {5, 7},
 1702                 {0, 0}
 1703                 }
 1704         },
 1705         {0, 1, 3, 0,            /* 0xea */
 1706                 {{1, 1},
 1707                 {3, 3},
 1708                 {5, 7},
 1709                 {0, 0}
 1710                 }
 1711         },
 1712         {1, 1, 3, 0,            /* 0xeb */
 1713                 {{0, 1},
 1714                 {3, 3},
 1715                 {5, 7},
 1716                 {0, 0}
 1717                 }
 1718         },
 1719         {0, 1, 2, 0,            /* 0xec */
 1720                 {{2, 3},
 1721                 {5, 7},
 1722                 {0, 0},
 1723                 {0, 0}
 1724                 }
 1725         },
 1726         {1, 1, 3, 0,            /* 0xed */
 1727                 {{0, 0},
 1728                 {2, 3},
 1729                 {5, 7},
 1730                 {0, 0}
 1731                 }
 1732         },
 1733         {0, 1, 2, 0,            /* 0xee */
 1734                 {{1, 3},
 1735                 {5, 7},
 1736                 {0, 0},
 1737                 {0, 0}
 1738                 }
 1739         },
 1740         {1, 1, 2, 0,            /* 0xef */
 1741                 {{0, 3},
 1742                 {5, 7},
 1743                 {0, 0},
 1744                 {0, 0}
 1745                 }
 1746         },
 1747         {0, 1, 1, 0,            /* 0xf0 */
 1748                 {{4, 7},
 1749                 {0, 0},
 1750                 {0, 0},
 1751                 {0, 0}
 1752                 }
 1753         },
 1754         {1, 1, 2, 0,            /* 0xf1 */
 1755                 {{0, 0},
 1756                 {4, 7},
 1757                 {0, 0},
 1758                 {0, 0}
 1759                 }
 1760         },
 1761         {0, 1, 2, 0,            /* 0xf2 */
 1762                 {{1, 1},
 1763                 {4, 7},
 1764                 {0, 0},
 1765                 {0, 0}
 1766                 }
 1767         },
 1768         {1, 1, 2, 0,            /* 0xf3 */
 1769                 {{0, 1},
 1770                 {4, 7},
 1771                 {0, 0},
 1772                 {0, 0}
 1773                 }
 1774         },
 1775         {0, 1, 2, 0,            /* 0xf4 */
 1776                 {{2, 2},
 1777                 {4, 7},
 1778                 {0, 0},
 1779                 {0, 0}
 1780                 }
 1781         },
 1782         {1, 1, 3, 0,            /* 0xf5 */
 1783                 {{0, 0},
 1784                 {2, 2},
 1785                 {4, 7},
 1786                 {0, 0}
 1787                 }
 1788         },
 1789         {0, 1, 2, 0,            /* 0xf6 */
 1790                 {{1, 2},
 1791                 {4, 7},
 1792                 {0, 0},
 1793                 {0, 0}
 1794                 }
 1795         },
 1796         {1, 1, 2, 0,            /* 0xf7 */
 1797                 {{0, 2},
 1798                 {4, 7},
 1799                 {0, 0},
 1800                 {0, 0}
 1801                 }
 1802         },
 1803         {0, 1, 1, 0,            /* 0xf8 */
 1804                 {{3, 7},
 1805                 {0, 0},
 1806                 {0, 0},
 1807                 {0, 0}
 1808                 }
 1809         },
 1810         {1, 1, 2, 0,            /* 0xf9 */
 1811                 {{0, 0},
 1812                 {3, 7},
 1813                 {0, 0},
 1814                 {0, 0}
 1815                 }
 1816         },
 1817         {0, 1, 2, 0,            /* 0xfa */
 1818                 {{1, 1},
 1819                 {3, 7},
 1820                 {0, 0},
 1821                 {0, 0}
 1822                 }
 1823         },
 1824         {1, 1, 2, 0,            /* 0xfb */
 1825                 {{0, 1},
 1826                 {3, 7},
 1827                 {0, 0},
 1828                 {0, 0}
 1829                 }
 1830         },
 1831         {0, 1, 1, 0,            /* 0xfc */
 1832                 {{2, 7},
 1833                 {0, 0},
 1834                 {0, 0},
 1835                 {0, 0}
 1836                 }
 1837         },
 1838         {1, 1, 2, 0,            /* 0xfd */
 1839                 {{0, 0},
 1840                 {2, 7},
 1841                 {0, 0},
 1842                 {0, 0}
 1843                 }
 1844         },
 1845         {0, 1, 1, 0,            /* 0xfe */
 1846                 {{1, 7},
 1847                 {0, 0},
 1848                 {0, 0},
 1849                 {0, 0}
 1850                 }
 1851         },
 1852         {1, 1, 1, 0,            /* 0xff */
 1853                 {{0, 7},
 1854                 {0, 0},
 1855                 {0, 0},
 1856                 {0, 0}
 1857                 }
 1858         }
 1859 };
 1860 
 1861 /* EY  below are nr_sacks version of the preceeding two data structures, identical except their names */
 1862 #define SCTP_MAX_NR_GAPS_INARRAY 4
 1863 struct nr_sack_track {
 1864         uint8_t right_edge;     /* mergable on the right edge */
 1865         uint8_t left_edge;      /* mergable on the left edge */
 1866         uint8_t num_entries;
 1867         uint8_t spare;
 1868         struct sctp_nr_gap_ack_block nr_gaps[SCTP_MAX_NR_GAPS_INARRAY];
 1869 };
 1870 
 1871 struct nr_sack_track nr_sack_array[256] = {
 1872         {0, 0, 0, 0,            /* 0x00 */
 1873                 {{0, 0},
 1874                 {0, 0},
 1875                 {0, 0},
 1876                 {0, 0}
 1877                 }
 1878         },
 1879         {1, 0, 1, 0,            /* 0x01 */
 1880                 {{0, 0},
 1881                 {0, 0},
 1882                 {0, 0},
 1883                 {0, 0}
 1884                 }
 1885         },
 1886         {0, 0, 1, 0,            /* 0x02 */
 1887                 {{1, 1},
 1888                 {0, 0},
 1889                 {0, 0},
 1890                 {0, 0}
 1891                 }
 1892         },
 1893         {1, 0, 1, 0,            /* 0x03 */
 1894                 {{0, 1},
 1895                 {0, 0},
 1896                 {0, 0},
 1897                 {0, 0}
 1898                 }
 1899         },
 1900         {0, 0, 1, 0,            /* 0x04 */
 1901                 {{2, 2},
 1902                 {0, 0},
 1903                 {0, 0},
 1904                 {0, 0}
 1905                 }
 1906         },
 1907         {1, 0, 2, 0,            /* 0x05 */
 1908                 {{0, 0},
 1909                 {2, 2},
 1910                 {0, 0},
 1911                 {0, 0}
 1912                 }
 1913         },
 1914         {0, 0, 1, 0,            /* 0x06 */
 1915                 {{1, 2},
 1916                 {0, 0},
 1917                 {0, 0},
 1918                 {0, 0}
 1919                 }
 1920         },
 1921         {1, 0, 1, 0,            /* 0x07 */
 1922                 {{0, 2},
 1923                 {0, 0},
 1924                 {0, 0},
 1925                 {0, 0}
 1926                 }
 1927         },
 1928         {0, 0, 1, 0,            /* 0x08 */
 1929                 {{3, 3},
 1930                 {0, 0},
 1931                 {0, 0},
 1932                 {0, 0}
 1933                 }
 1934         },
 1935         {1, 0, 2, 0,            /* 0x09 */
 1936                 {{0, 0},
 1937                 {3, 3},
 1938                 {0, 0},
 1939                 {0, 0}
 1940                 }
 1941         },
 1942         {0, 0, 2, 0,            /* 0x0a */
 1943                 {{1, 1},
 1944                 {3, 3},
 1945                 {0, 0},
 1946                 {0, 0}
 1947                 }
 1948         },
 1949         {1, 0, 2, 0,            /* 0x0b */
 1950                 {{0, 1},
 1951                 {3, 3},
 1952                 {0, 0},
 1953                 {0, 0}
 1954                 }
 1955         },
 1956         {0, 0, 1, 0,            /* 0x0c */
 1957                 {{2, 3},
 1958                 {0, 0},
 1959                 {0, 0},
 1960                 {0, 0}
 1961                 }
 1962         },
 1963         {1, 0, 2, 0,            /* 0x0d */
 1964                 {{0, 0},
 1965                 {2, 3},
 1966                 {0, 0},
 1967                 {0, 0}
 1968                 }
 1969         },
 1970         {0, 0, 1, 0,            /* 0x0e */
 1971                 {{1, 3},
 1972                 {0, 0},
 1973                 {0, 0},
 1974                 {0, 0}
 1975                 }
 1976         },
 1977         {1, 0, 1, 0,            /* 0x0f */
 1978                 {{0, 3},
 1979                 {0, 0},
 1980                 {0, 0},
 1981                 {0, 0}
 1982                 }
 1983         },
 1984         {0, 0, 1, 0,            /* 0x10 */
 1985                 {{4, 4},
 1986                 {0, 0},
 1987                 {0, 0},
 1988                 {0, 0}
 1989                 }
 1990         },
 1991         {1, 0, 2, 0,            /* 0x11 */
 1992                 {{0, 0},
 1993                 {4, 4},
 1994                 {0, 0},
 1995                 {0, 0}
 1996                 }
 1997         },
 1998         {0, 0, 2, 0,            /* 0x12 */
 1999                 {{1, 1},
 2000                 {4, 4},
 2001                 {0, 0},
 2002                 {0, 0}
 2003                 }
 2004         },
 2005         {1, 0, 2, 0,            /* 0x13 */
 2006                 {{0, 1},
 2007                 {4, 4},
 2008                 {0, 0},
 2009                 {0, 0}
 2010                 }
 2011         },
 2012         {0, 0, 2, 0,            /* 0x14 */
 2013                 {{2, 2},
 2014                 {4, 4},
 2015                 {0, 0},
 2016                 {0, 0}
 2017                 }
 2018         },
 2019         {1, 0, 3, 0,            /* 0x15 */
 2020                 {{0, 0},
 2021                 {2, 2},
 2022                 {4, 4},
 2023                 {0, 0}
 2024                 }
 2025         },
 2026         {0, 0, 2, 0,            /* 0x16 */
 2027                 {{1, 2},
 2028                 {4, 4},
 2029                 {0, 0},
 2030                 {0, 0}
 2031                 }
 2032         },
 2033         {1, 0, 2, 0,            /* 0x17 */
 2034                 {{0, 2},
 2035                 {4, 4},
 2036                 {0, 0},
 2037                 {0, 0}
 2038                 }
 2039         },
 2040         {0, 0, 1, 0,            /* 0x18 */
 2041                 {{3, 4},
 2042                 {0, 0},
 2043                 {0, 0},
 2044                 {0, 0}
 2045                 }
 2046         },
 2047         {1, 0, 2, 0,            /* 0x19 */
 2048                 {{0, 0},
 2049                 {3, 4},
 2050                 {0, 0},
 2051                 {0, 0}
 2052                 }
 2053         },
 2054         {0, 0, 2, 0,            /* 0x1a */
 2055                 {{1, 1},
 2056                 {3, 4},
 2057                 {0, 0},
 2058                 {0, 0}
 2059                 }
 2060         },
 2061         {1, 0, 2, 0,            /* 0x1b */
 2062                 {{0, 1},
 2063                 {3, 4},
 2064                 {0, 0},
 2065                 {0, 0}
 2066                 }
 2067         },
 2068         {0, 0, 1, 0,            /* 0x1c */
 2069                 {{2, 4},
 2070                 {0, 0},
 2071                 {0, 0},
 2072                 {0, 0}
 2073                 }
 2074         },
 2075         {1, 0, 2, 0,            /* 0x1d */
 2076                 {{0, 0},
 2077                 {2, 4},
 2078                 {0, 0},
 2079                 {0, 0}
 2080                 }
 2081         },
 2082         {0, 0, 1, 0,            /* 0x1e */
 2083                 {{1, 4},
 2084                 {0, 0},
 2085                 {0, 0},
 2086                 {0, 0}
 2087                 }
 2088         },
 2089         {1, 0, 1, 0,            /* 0x1f */
 2090                 {{0, 4},
 2091                 {0, 0},
 2092                 {0, 0},
 2093                 {0, 0}
 2094                 }
 2095         },
 2096         {0, 0, 1, 0,            /* 0x20 */
 2097                 {{5, 5},
 2098                 {0, 0},
 2099                 {0, 0},
 2100                 {0, 0}
 2101                 }
 2102         },
 2103         {1, 0, 2, 0,            /* 0x21 */
 2104                 {{0, 0},
 2105                 {5, 5},
 2106                 {0, 0},
 2107                 {0, 0}
 2108                 }
 2109         },
 2110         {0, 0, 2, 0,            /* 0x22 */
 2111                 {{1, 1},
 2112                 {5, 5},
 2113                 {0, 0},
 2114                 {0, 0}
 2115                 }
 2116         },
 2117         {1, 0, 2, 0,            /* 0x23 */
 2118                 {{0, 1},
 2119                 {5, 5},
 2120                 {0, 0},
 2121                 {0, 0}
 2122                 }
 2123         },
 2124         {0, 0, 2, 0,            /* 0x24 */
 2125                 {{2, 2},
 2126                 {5, 5},
 2127                 {0, 0},
 2128                 {0, 0}
 2129                 }
 2130         },
 2131         {1, 0, 3, 0,            /* 0x25 */
 2132                 {{0, 0},
 2133                 {2, 2},
 2134                 {5, 5},
 2135                 {0, 0}
 2136                 }
 2137         },
 2138         {0, 0, 2, 0,            /* 0x26 */
 2139                 {{1, 2},
 2140                 {5, 5},
 2141                 {0, 0},
 2142                 {0, 0}
 2143                 }
 2144         },
 2145         {1, 0, 2, 0,            /* 0x27 */
 2146                 {{0, 2},
 2147                 {5, 5},
 2148                 {0, 0},
 2149                 {0, 0}
 2150                 }
 2151         },
 2152         {0, 0, 2, 0,            /* 0x28 */
 2153                 {{3, 3},
 2154                 {5, 5},
 2155                 {0, 0},
 2156                 {0, 0}
 2157                 }
 2158         },
 2159         {1, 0, 3, 0,            /* 0x29 */
 2160                 {{0, 0},
 2161                 {3, 3},
 2162                 {5, 5},
 2163                 {0, 0}
 2164                 }
 2165         },
 2166         {0, 0, 3, 0,            /* 0x2a */
 2167                 {{1, 1},
 2168                 {3, 3},
 2169                 {5, 5},
 2170                 {0, 0}
 2171                 }
 2172         },
 2173         {1, 0, 3, 0,            /* 0x2b */
 2174                 {{0, 1},
 2175                 {3, 3},
 2176                 {5, 5},
 2177                 {0, 0}
 2178                 }
 2179         },
 2180         {0, 0, 2, 0,            /* 0x2c */
 2181                 {{2, 3},
 2182                 {5, 5},
 2183                 {0, 0},
 2184                 {0, 0}
 2185                 }
 2186         },
 2187         {1, 0, 3, 0,            /* 0x2d */
 2188                 {{0, 0},
 2189                 {2, 3},
 2190                 {5, 5},
 2191                 {0, 0}
 2192                 }
 2193         },
 2194         {0, 0, 2, 0,            /* 0x2e */
 2195                 {{1, 3},
 2196                 {5, 5},
 2197                 {0, 0},
 2198                 {0, 0}
 2199                 }
 2200         },
 2201         {1, 0, 2, 0,            /* 0x2f */
 2202                 {{0, 3},
 2203                 {5, 5},
 2204                 {0, 0},
 2205                 {0, 0}
 2206                 }
 2207         },
 2208         {0, 0, 1, 0,            /* 0x30 */
 2209                 {{4, 5},
 2210                 {0, 0},
 2211                 {0, 0},
 2212                 {0, 0}
 2213                 }
 2214         },
 2215         {1, 0, 2, 0,            /* 0x31 */
 2216                 {{0, 0},
 2217                 {4, 5},
 2218                 {0, 0},
 2219                 {0, 0}
 2220                 }
 2221         },
 2222         {0, 0, 2, 0,            /* 0x32 */
 2223                 {{1, 1},
 2224                 {4, 5},
 2225                 {0, 0},
 2226                 {0, 0}
 2227                 }
 2228         },
 2229         {1, 0, 2, 0,            /* 0x33 */
 2230                 {{0, 1},
 2231                 {4, 5},
 2232                 {0, 0},
 2233                 {0, 0}
 2234                 }
 2235         },
 2236         {0, 0, 2, 0,            /* 0x34 */
 2237                 {{2, 2},
 2238                 {4, 5},
 2239                 {0, 0},
 2240                 {0, 0}
 2241                 }
 2242         },
 2243         {1, 0, 3, 0,            /* 0x35 */
 2244                 {{0, 0},
 2245                 {2, 2},
 2246                 {4, 5},
 2247                 {0, 0}
 2248                 }
 2249         },
 2250         {0, 0, 2, 0,            /* 0x36 */
 2251                 {{1, 2},
 2252                 {4, 5},
 2253                 {0, 0},
 2254                 {0, 0}
 2255                 }
 2256         },
 2257         {1, 0, 2, 0,            /* 0x37 */
 2258                 {{0, 2},
 2259                 {4, 5},
 2260                 {0, 0},
 2261                 {0, 0}
 2262                 }
 2263         },
 2264         {0, 0, 1, 0,            /* 0x38 */
 2265                 {{3, 5},
 2266                 {0, 0},
 2267                 {0, 0},
 2268                 {0, 0}
 2269                 }
 2270         },
 2271         {1, 0, 2, 0,            /* 0x39 */
 2272                 {{0, 0},
 2273                 {3, 5},
 2274                 {0, 0},
 2275                 {0, 0}
 2276                 }
 2277         },
 2278         {0, 0, 2, 0,            /* 0x3a */
 2279                 {{1, 1},
 2280                 {3, 5},
 2281                 {0, 0},
 2282                 {0, 0}
 2283                 }
 2284         },
 2285         {1, 0, 2, 0,            /* 0x3b */
 2286                 {{0, 1},
 2287                 {3, 5},
 2288                 {0, 0},
 2289                 {0, 0}
 2290                 }
 2291         },
 2292         {0, 0, 1, 0,            /* 0x3c */
 2293                 {{2, 5},
 2294                 {0, 0},
 2295                 {0, 0},
 2296                 {0, 0}
 2297                 }
 2298         },
 2299         {1, 0, 2, 0,            /* 0x3d */
 2300                 {{0, 0},
 2301                 {2, 5},
 2302                 {0, 0},
 2303                 {0, 0}
 2304                 }
 2305         },
 2306         {0, 0, 1, 0,            /* 0x3e */
 2307                 {{1, 5},
 2308                 {0, 0},
 2309                 {0, 0},
 2310                 {0, 0}
 2311                 }
 2312         },
 2313         {1, 0, 1, 0,            /* 0x3f */
 2314                 {{0, 5},
 2315                 {0, 0},
 2316                 {0, 0},
 2317                 {0, 0}
 2318                 }
 2319         },
 2320         {0, 0, 1, 0,            /* 0x40 */
 2321                 {{6, 6},
 2322                 {0, 0},
 2323                 {0, 0},
 2324                 {0, 0}
 2325                 }
 2326         },
 2327         {1, 0, 2, 0,            /* 0x41 */
 2328                 {{0, 0},
 2329                 {6, 6},
 2330                 {0, 0},
 2331                 {0, 0}
 2332                 }
 2333         },
 2334         {0, 0, 2, 0,            /* 0x42 */
 2335                 {{1, 1},
 2336                 {6, 6},
 2337                 {0, 0},
 2338                 {0, 0}
 2339                 }
 2340         },
 2341         {1, 0, 2, 0,            /* 0x43 */
 2342                 {{0, 1},
 2343                 {6, 6},
 2344                 {0, 0},
 2345                 {0, 0}
 2346                 }
 2347         },
 2348         {0, 0, 2, 0,            /* 0x44 */
 2349                 {{2, 2},
 2350                 {6, 6},
 2351                 {0, 0},
 2352                 {0, 0}
 2353                 }
 2354         },
 2355         {1, 0, 3, 0,            /* 0x45 */
 2356                 {{0, 0},
 2357                 {2, 2},
 2358                 {6, 6},
 2359                 {0, 0}
 2360                 }
 2361         },
 2362         {0, 0, 2, 0,            /* 0x46 */
 2363                 {{1, 2},
 2364                 {6, 6},
 2365                 {0, 0},
 2366                 {0, 0}
 2367                 }
 2368         },
 2369         {1, 0, 2, 0,            /* 0x47 */
 2370                 {{0, 2},
 2371                 {6, 6},
 2372                 {0, 0},
 2373                 {0, 0}
 2374                 }
 2375         },
 2376         {0, 0, 2, 0,            /* 0x48 */
 2377                 {{3, 3},
 2378                 {6, 6},
 2379                 {0, 0},
 2380                 {0, 0}
 2381                 }
 2382         },
 2383         {1, 0, 3, 0,            /* 0x49 */
 2384                 {{0, 0},
 2385                 {3, 3},
 2386                 {6, 6},
 2387                 {0, 0}
 2388                 }
 2389         },
 2390         {0, 0, 3, 0,            /* 0x4a */
 2391                 {{1, 1},
 2392                 {3, 3},
 2393                 {6, 6},
 2394                 {0, 0}
 2395                 }
 2396         },
 2397         {1, 0, 3, 0,            /* 0x4b */
 2398                 {{0, 1},
 2399                 {3, 3},
 2400                 {6, 6},
 2401                 {0, 0}
 2402                 }
 2403         },
 2404         {0, 0, 2, 0,            /* 0x4c */
 2405                 {{2, 3},
 2406                 {6, 6},
 2407                 {0, 0},
 2408                 {0, 0}
 2409                 }
 2410         },
 2411         {1, 0, 3, 0,            /* 0x4d */
 2412                 {{0, 0},
 2413                 {2, 3},
 2414                 {6, 6},
 2415                 {0, 0}
 2416                 }
 2417         },
 2418         {0, 0, 2, 0,            /* 0x4e */
 2419                 {{1, 3},
 2420                 {6, 6},
 2421                 {0, 0},
 2422                 {0, 0}
 2423                 }
 2424         },
 2425         {1, 0, 2, 0,            /* 0x4f */
 2426                 {{0, 3},
 2427                 {6, 6},
 2428                 {0, 0},
 2429                 {0, 0}
 2430                 }
 2431         },
 2432         {0, 0, 2, 0,            /* 0x50 */
 2433                 {{4, 4},
 2434                 {6, 6},
 2435                 {0, 0},
 2436                 {0, 0}
 2437                 }
 2438         },
 2439         {1, 0, 3, 0,            /* 0x51 */
 2440                 {{0, 0},
 2441                 {4, 4},
 2442                 {6, 6},
 2443                 {0, 0}
 2444                 }
 2445         },
 2446         {0, 0, 3, 0,            /* 0x52 */
 2447                 {{1, 1},
 2448                 {4, 4},
 2449                 {6, 6},
 2450                 {0, 0}
 2451                 }
 2452         },
 2453         {1, 0, 3, 0,            /* 0x53 */
 2454                 {{0, 1},
 2455                 {4, 4},
 2456                 {6, 6},
 2457                 {0, 0}
 2458                 }
 2459         },
 2460         {0, 0, 3, 0,            /* 0x54 */
 2461                 {{2, 2},
 2462                 {4, 4},
 2463                 {6, 6},
 2464                 {0, 0}
 2465                 }
 2466         },
 2467         {1, 0, 4, 0,            /* 0x55 */
 2468                 {{0, 0},
 2469                 {2, 2},
 2470                 {4, 4},
 2471                 {6, 6}
 2472                 }
 2473         },
 2474         {0, 0, 3, 0,            /* 0x56 */
 2475                 {{1, 2},
 2476                 {4, 4},
 2477                 {6, 6},
 2478                 {0, 0}
 2479                 }
 2480         },
 2481         {1, 0, 3, 0,            /* 0x57 */
 2482                 {{0, 2},
 2483                 {4, 4},
 2484                 {6, 6},
 2485                 {0, 0}
 2486                 }
 2487         },
 2488         {0, 0, 2, 0,            /* 0x58 */
 2489                 {{3, 4},
 2490                 {6, 6},
 2491                 {0, 0},
 2492                 {0, 0}
 2493                 }
 2494         },
 2495         {1, 0, 3, 0,            /* 0x59 */
 2496                 {{0, 0},
 2497                 {3, 4},
 2498                 {6, 6},
 2499                 {0, 0}
 2500                 }
 2501         },
 2502         {0, 0, 3, 0,            /* 0x5a */
 2503                 {{1, 1},
 2504                 {3, 4},
 2505                 {6, 6},
 2506                 {0, 0}
 2507                 }
 2508         },
 2509         {1, 0, 3, 0,            /* 0x5b */
 2510                 {{0, 1},
 2511                 {3, 4},
 2512                 {6, 6},
 2513                 {0, 0}
 2514                 }
 2515         },
 2516         {0, 0, 2, 0,            /* 0x5c */
 2517                 {{2, 4},
 2518                 {6, 6},
 2519                 {0, 0},
 2520                 {0, 0}
 2521                 }
 2522         },
 2523         {1, 0, 3, 0,            /* 0x5d */
 2524                 {{0, 0},
 2525                 {2, 4},
 2526                 {6, 6},
 2527                 {0, 0}
 2528                 }
 2529         },
 2530         {0, 0, 2, 0,            /* 0x5e */
 2531                 {{1, 4},
 2532                 {6, 6},
 2533                 {0, 0},
 2534                 {0, 0}
 2535                 }
 2536         },
 2537         {1, 0, 2, 0,            /* 0x5f */
 2538                 {{0, 4},
 2539                 {6, 6},
 2540                 {0, 0},
 2541                 {0, 0}
 2542                 }
 2543         },
 2544         {0, 0, 1, 0,            /* 0x60 */
 2545                 {{5, 6},
 2546                 {0, 0},
 2547                 {0, 0},
 2548                 {0, 0}
 2549                 }
 2550         },
 2551         {1, 0, 2, 0,            /* 0x61 */
 2552                 {{0, 0},
 2553                 {5, 6},
 2554                 {0, 0},
 2555                 {0, 0}
 2556                 }
 2557         },
 2558         {0, 0, 2, 0,            /* 0x62 */
 2559                 {{1, 1},
 2560                 {5, 6},
 2561                 {0, 0},
 2562                 {0, 0}
 2563                 }
 2564         },
 2565         {1, 0, 2, 0,            /* 0x63 */
 2566                 {{0, 1},
 2567                 {5, 6},
 2568                 {0, 0},
 2569                 {0, 0}
 2570                 }
 2571         },
 2572         {0, 0, 2, 0,            /* 0x64 */
 2573                 {{2, 2},
 2574                 {5, 6},
 2575                 {0, 0},
 2576                 {0, 0}
 2577                 }
 2578         },
 2579         {1, 0, 3, 0,            /* 0x65 */
 2580                 {{0, 0},
 2581                 {2, 2},
 2582                 {5, 6},
 2583                 {0, 0}
 2584                 }
 2585         },
 2586         {0, 0, 2, 0,            /* 0x66 */
 2587                 {{1, 2},
 2588                 {5, 6},
 2589                 {0, 0},
 2590                 {0, 0}
 2591                 }
 2592         },
 2593         {1, 0, 2, 0,            /* 0x67 */
 2594                 {{0, 2},
 2595                 {5, 6},
 2596                 {0, 0},
 2597                 {0, 0}
 2598                 }
 2599         },
 2600         {0, 0, 2, 0,            /* 0x68 */
 2601                 {{3, 3},
 2602                 {5, 6},
 2603                 {0, 0},
 2604                 {0, 0}
 2605                 }
 2606         },
 2607         {1, 0, 3, 0,            /* 0x69 */
 2608                 {{0, 0},
 2609                 {3, 3},
 2610                 {5, 6},
 2611                 {0, 0}
 2612                 }
 2613         },
 2614         {0, 0, 3, 0,            /* 0x6a */
 2615                 {{1, 1},
 2616                 {3, 3},
 2617                 {5, 6},
 2618                 {0, 0}
 2619                 }
 2620         },
 2621         {1, 0, 3, 0,            /* 0x6b */
 2622                 {{0, 1},
 2623                 {3, 3},
 2624                 {5, 6},
 2625                 {0, 0}
 2626                 }
 2627         },
 2628         {0, 0, 2, 0,            /* 0x6c */
 2629                 {{2, 3},
 2630                 {5, 6},
 2631                 {0, 0},
 2632                 {0, 0}
 2633                 }
 2634         },
 2635         {1, 0, 3, 0,            /* 0x6d */
 2636                 {{0, 0},
 2637                 {2, 3},
 2638                 {5, 6},
 2639                 {0, 0}
 2640                 }
 2641         },
 2642         {0, 0, 2, 0,            /* 0x6e */
 2643                 {{1, 3},
 2644                 {5, 6},
 2645                 {0, 0},
 2646                 {0, 0}
 2647                 }
 2648         },
 2649         {1, 0, 2, 0,            /* 0x6f */
 2650                 {{0, 3},
 2651                 {5, 6},
 2652                 {0, 0},
 2653                 {0, 0}
 2654                 }
 2655         },
 2656         {0, 0, 1, 0,            /* 0x70 */
 2657                 {{4, 6},
 2658                 {0, 0},
 2659                 {0, 0},
 2660                 {0, 0}
 2661                 }
 2662         },
 2663         {1, 0, 2, 0,            /* 0x71 */
 2664                 {{0, 0},
 2665                 {4, 6},
 2666                 {0, 0},
 2667                 {0, 0}
 2668                 }
 2669         },
 2670         {0, 0, 2, 0,            /* 0x72 */
 2671                 {{1, 1},
 2672                 {4, 6},
 2673                 {0, 0},
 2674                 {0, 0}
 2675                 }
 2676         },
 2677         {1, 0, 2, 0,            /* 0x73 */
 2678                 {{0, 1},
 2679                 {4, 6},
 2680                 {0, 0},
 2681                 {0, 0}
 2682                 }
 2683         },
 2684         {0, 0, 2, 0,            /* 0x74 */
 2685                 {{2, 2},
 2686                 {4, 6},
 2687                 {0, 0},
 2688                 {0, 0}
 2689                 }
 2690         },
 2691         {1, 0, 3, 0,            /* 0x75 */
 2692                 {{0, 0},
 2693                 {2, 2},
 2694                 {4, 6},
 2695                 {0, 0}
 2696                 }
 2697         },
 2698         {0, 0, 2, 0,            /* 0x76 */
 2699                 {{1, 2},
 2700                 {4, 6},
 2701                 {0, 0},
 2702                 {0, 0}
 2703                 }
 2704         },
 2705         {1, 0, 2, 0,            /* 0x77 */
 2706                 {{0, 2},
 2707                 {4, 6},
 2708                 {0, 0},
 2709                 {0, 0}
 2710                 }
 2711         },
 2712         {0, 0, 1, 0,            /* 0x78 */
 2713                 {{3, 6},
 2714                 {0, 0},
 2715                 {0, 0},
 2716                 {0, 0}
 2717                 }
 2718         },
 2719         {1, 0, 2, 0,            /* 0x79 */
 2720                 {{0, 0},
 2721                 {3, 6},
 2722                 {0, 0},
 2723                 {0, 0}
 2724                 }
 2725         },
 2726         {0, 0, 2, 0,            /* 0x7a */
 2727                 {{1, 1},
 2728                 {3, 6},
 2729                 {0, 0},
 2730                 {0, 0}
 2731                 }
 2732         },
 2733         {1, 0, 2, 0,            /* 0x7b */
 2734                 {{0, 1},
 2735                 {3, 6},
 2736                 {0, 0},
 2737                 {0, 0}
 2738                 }
 2739         },
 2740         {0, 0, 1, 0,            /* 0x7c */
 2741                 {{2, 6},
 2742                 {0, 0},
 2743                 {0, 0},
 2744                 {0, 0}
 2745                 }
 2746         },
 2747         {1, 0, 2, 0,            /* 0x7d */
 2748                 {{0, 0},
 2749                 {2, 6},
 2750                 {0, 0},
 2751                 {0, 0}
 2752                 }
 2753         },
 2754         {0, 0, 1, 0,            /* 0x7e */
 2755                 {{1, 6},
 2756                 {0, 0},
 2757                 {0, 0},
 2758                 {0, 0}
 2759                 }
 2760         },
 2761         {1, 0, 1, 0,            /* 0x7f */
 2762                 {{0, 6},
 2763                 {0, 0},
 2764                 {0, 0},
 2765                 {0, 0}
 2766                 }
 2767         },
 2768         {0, 1, 1, 0,            /* 0x80 */
 2769                 {{7, 7},
 2770                 {0, 0},
 2771                 {0, 0},
 2772                 {0, 0}
 2773                 }
 2774         },
 2775         {1, 1, 2, 0,            /* 0x81 */
 2776                 {{0, 0},
 2777                 {7, 7},
 2778                 {0, 0},
 2779                 {0, 0}
 2780                 }
 2781         },
 2782         {0, 1, 2, 0,            /* 0x82 */
 2783                 {{1, 1},
 2784                 {7, 7},
 2785                 {0, 0},
 2786                 {0, 0}
 2787                 }
 2788         },
 2789         {1, 1, 2, 0,            /* 0x83 */
 2790                 {{0, 1},
 2791                 {7, 7},
 2792                 {0, 0},
 2793                 {0, 0}
 2794                 }
 2795         },
 2796         {0, 1, 2, 0,            /* 0x84 */
 2797                 {{2, 2},
 2798                 {7, 7},
 2799                 {0, 0},
 2800                 {0, 0}
 2801                 }
 2802         },
 2803         {1, 1, 3, 0,            /* 0x85 */
 2804                 {{0, 0},
 2805                 {2, 2},
 2806                 {7, 7},
 2807                 {0, 0}
 2808                 }
 2809         },
 2810         {0, 1, 2, 0,            /* 0x86 */
 2811                 {{1, 2},
 2812                 {7, 7},
 2813                 {0, 0},
 2814                 {0, 0}
 2815                 }
 2816         },
 2817         {1, 1, 2, 0,            /* 0x87 */
 2818                 {{0, 2},
 2819                 {7, 7},
 2820                 {0, 0},
 2821                 {0, 0}
 2822                 }
 2823         },
 2824         {0, 1, 2, 0,            /* 0x88 */
 2825                 {{3, 3},
 2826                 {7, 7},
 2827                 {0, 0},
 2828                 {0, 0}
 2829                 }
 2830         },
 2831         {1, 1, 3, 0,            /* 0x89 */
 2832                 {{0, 0},
 2833                 {3, 3},
 2834                 {7, 7},
 2835                 {0, 0}
 2836                 }
 2837         },
 2838         {0, 1, 3, 0,            /* 0x8a */
 2839                 {{1, 1},
 2840                 {3, 3},
 2841                 {7, 7},
 2842                 {0, 0}
 2843                 }
 2844         },
 2845         {1, 1, 3, 0,            /* 0x8b */
 2846                 {{0, 1},
 2847                 {3, 3},
 2848                 {7, 7},
 2849                 {0, 0}
 2850                 }
 2851         },
 2852         {0, 1, 2, 0,            /* 0x8c */
 2853                 {{2, 3},
 2854                 {7, 7},
 2855                 {0, 0},
 2856                 {0, 0}
 2857                 }
 2858         },
 2859         {1, 1, 3, 0,            /* 0x8d */
 2860                 {{0, 0},
 2861                 {2, 3},
 2862                 {7, 7},
 2863                 {0, 0}
 2864                 }
 2865         },
 2866         {0, 1, 2, 0,            /* 0x8e */
 2867                 {{1, 3},
 2868                 {7, 7},
 2869                 {0, 0},
 2870                 {0, 0}
 2871                 }
 2872         },
 2873         {1, 1, 2, 0,            /* 0x8f */
 2874                 {{0, 3},
 2875                 {7, 7},
 2876                 {0, 0},
 2877                 {0, 0}
 2878                 }
 2879         },
 2880         {0, 1, 2, 0,            /* 0x90 */
 2881                 {{4, 4},
 2882                 {7, 7},
 2883                 {0, 0},
 2884                 {0, 0}
 2885                 }
 2886         },
 2887         {1, 1, 3, 0,            /* 0x91 */
 2888                 {{0, 0},
 2889                 {4, 4},
 2890                 {7, 7},
 2891                 {0, 0}
 2892                 }
 2893         },
 2894         {0, 1, 3, 0,            /* 0x92 */
 2895                 {{1, 1},
 2896                 {4, 4},
 2897                 {7, 7},
 2898                 {0, 0}
 2899                 }
 2900         },
 2901         {1, 1, 3, 0,            /* 0x93 */
 2902                 {{0, 1},
 2903                 {4, 4},
 2904                 {7, 7},
 2905                 {0, 0}
 2906                 }
 2907         },
 2908         {0, 1, 3, 0,            /* 0x94 */
 2909                 {{2, 2},
 2910                 {4, 4},
 2911                 {7, 7},
 2912                 {0, 0}
 2913                 }
 2914         },
 2915         {1, 1, 4, 0,            /* 0x95 */
 2916                 {{0, 0},
 2917                 {2, 2},
 2918                 {4, 4},
 2919                 {7, 7}
 2920                 }
 2921         },
 2922         {0, 1, 3, 0,            /* 0x96 */
 2923                 {{1, 2},
 2924                 {4, 4},
 2925                 {7, 7},
 2926                 {0, 0}
 2927                 }
 2928         },
 2929         {1, 1, 3, 0,            /* 0x97 */
 2930                 {{0, 2},
 2931                 {4, 4},
 2932                 {7, 7},
 2933                 {0, 0}
 2934                 }
 2935         },
 2936         {0, 1, 2, 0,            /* 0x98 */
 2937                 {{3, 4},
 2938                 {7, 7},
 2939                 {0, 0},
 2940                 {0, 0}
 2941                 }
 2942         },
 2943         {1, 1, 3, 0,            /* 0x99 */
 2944                 {{0, 0},
 2945                 {3, 4},
 2946                 {7, 7},
 2947                 {0, 0}
 2948                 }
 2949         },
 2950         {0, 1, 3, 0,            /* 0x9a */
 2951                 {{1, 1},
 2952                 {3, 4},
 2953                 {7, 7},
 2954                 {0, 0}
 2955                 }
 2956         },
 2957         {1, 1, 3, 0,            /* 0x9b */
 2958                 {{0, 1},
 2959                 {3, 4},
 2960                 {7, 7},
 2961                 {0, 0}
 2962                 }
 2963         },
 2964         {0, 1, 2, 0,            /* 0x9c */
 2965                 {{2, 4},
 2966                 {7, 7},
 2967                 {0, 0},
 2968                 {0, 0}
 2969                 }
 2970         },
 2971         {1, 1, 3, 0,            /* 0x9d */
 2972                 {{0, 0},
 2973                 {2, 4},
 2974                 {7, 7},
 2975                 {0, 0}
 2976                 }
 2977         },
 2978         {0, 1, 2, 0,            /* 0x9e */
 2979                 {{1, 4},
 2980                 {7, 7},
 2981                 {0, 0},
 2982                 {0, 0}
 2983                 }
 2984         },
 2985         {1, 1, 2, 0,            /* 0x9f */
 2986                 {{0, 4},
 2987                 {7, 7},
 2988                 {0, 0},
 2989                 {0, 0}
 2990                 }
 2991         },
 2992         {0, 1, 2, 0,            /* 0xa0 */
 2993                 {{5, 5},
 2994                 {7, 7},
 2995                 {0, 0},
 2996                 {0, 0}
 2997                 }
 2998         },
 2999         {1, 1, 3, 0,            /* 0xa1 */
 3000                 {{0, 0},
 3001                 {5, 5},
 3002                 {7, 7},
 3003                 {0, 0}
 3004                 }
 3005         },
 3006         {0, 1, 3, 0,            /* 0xa2 */
 3007                 {{1, 1},
 3008                 {5, 5},
 3009                 {7, 7},
 3010                 {0, 0}
 3011                 }
 3012         },
 3013         {1, 1, 3, 0,            /* 0xa3 */
 3014                 {{0, 1},
 3015                 {5, 5},
 3016                 {7, 7},
 3017                 {0, 0}
 3018                 }
 3019         },
 3020         {0, 1, 3, 0,            /* 0xa4 */
 3021                 {{2, 2},
 3022                 {5, 5},
 3023                 {7, 7},
 3024                 {0, 0}
 3025                 }
 3026         },
 3027         {1, 1, 4, 0,            /* 0xa5 */
 3028                 {{0, 0},
 3029                 {2, 2},
 3030                 {5, 5},
 3031                 {7, 7}
 3032                 }
 3033         },
 3034         {0, 1, 3, 0,            /* 0xa6 */
 3035                 {{1, 2},
 3036                 {5, 5},
 3037                 {7, 7},
 3038                 {0, 0}
 3039                 }
 3040         },
 3041         {1, 1, 3, 0,            /* 0xa7 */
 3042                 {{0, 2},
 3043                 {5, 5},
 3044                 {7, 7},
 3045                 {0, 0}
 3046                 }
 3047         },
 3048         {0, 1, 3, 0,            /* 0xa8 */
 3049                 {{3, 3},
 3050                 {5, 5},
 3051                 {7, 7},
 3052                 {0, 0}
 3053                 }
 3054         },
 3055         {1, 1, 4, 0,            /* 0xa9 */
 3056                 {{0, 0},
 3057                 {3, 3},
 3058                 {5, 5},
 3059                 {7, 7}
 3060                 }
 3061         },
 3062         {0, 1, 4, 0,            /* 0xaa */
 3063                 {{1, 1},
 3064                 {3, 3},
 3065                 {5, 5},
 3066                 {7, 7}
 3067                 }
 3068         },
 3069         {1, 1, 4, 0,            /* 0xab */
 3070                 {{0, 1},
 3071                 {3, 3},
 3072                 {5, 5},
 3073                 {7, 7}
 3074                 }
 3075         },
 3076         {0, 1, 3, 0,            /* 0xac */
 3077                 {{2, 3},
 3078                 {5, 5},
 3079                 {7, 7},
 3080                 {0, 0}
 3081                 }
 3082         },
 3083         {1, 1, 4, 0,            /* 0xad */
 3084                 {{0, 0},
 3085                 {2, 3},
 3086                 {5, 5},
 3087                 {7, 7}
 3088                 }
 3089         },
 3090         {0, 1, 3, 0,            /* 0xae */
 3091                 {{1, 3},
 3092                 {5, 5},
 3093                 {7, 7},
 3094                 {0, 0}
 3095                 }
 3096         },
 3097         {1, 1, 3, 0,            /* 0xaf */
 3098                 {{0, 3},
 3099                 {5, 5},
 3100                 {7, 7},
 3101                 {0, 0}
 3102                 }
 3103         },
 3104         {0, 1, 2, 0,            /* 0xb0 */
 3105                 {{4, 5},
 3106                 {7, 7},
 3107                 {0, 0},
 3108                 {0, 0}
 3109                 }
 3110         },
 3111         {1, 1, 3, 0,            /* 0xb1 */
 3112                 {{0, 0},
 3113                 {4, 5},
 3114                 {7, 7},
 3115                 {0, 0}
 3116                 }
 3117         },
 3118         {0, 1, 3, 0,            /* 0xb2 */
 3119                 {{1, 1},
 3120                 {4, 5},
 3121                 {7, 7},
 3122                 {0, 0}
 3123                 }
 3124         },
 3125         {1, 1, 3, 0,            /* 0xb3 */
 3126                 {{0, 1},
 3127                 {4, 5},
 3128                 {7, 7},
 3129                 {0, 0}
 3130                 }
 3131         },
 3132         {0, 1, 3, 0,            /* 0xb4 */
 3133                 {{2, 2},
 3134                 {4, 5},
 3135                 {7, 7},
 3136                 {0, 0}
 3137                 }
 3138         },
 3139         {1, 1, 4, 0,            /* 0xb5 */
 3140                 {{0, 0},
 3141                 {2, 2},
 3142                 {4, 5},
 3143                 {7, 7}
 3144                 }
 3145         },
 3146         {0, 1, 3, 0,            /* 0xb6 */
 3147                 {{1, 2},
 3148                 {4, 5},
 3149                 {7, 7},
 3150                 {0, 0}
 3151                 }
 3152         },
 3153         {1, 1, 3, 0,            /* 0xb7 */
 3154                 {{0, 2},
 3155                 {4, 5},
 3156                 {7, 7},
 3157                 {0, 0}
 3158                 }
 3159         },
 3160         {0, 1, 2, 0,            /* 0xb8 */
 3161                 {{3, 5},
 3162                 {7, 7},
 3163                 {0, 0},
 3164                 {0, 0}
 3165                 }
 3166         },
 3167         {1, 1, 3, 0,            /* 0xb9 */
 3168                 {{0, 0},
 3169                 {3, 5},
 3170                 {7, 7},
 3171                 {0, 0}
 3172                 }
 3173         },
 3174         {0, 1, 3, 0,            /* 0xba */
 3175                 {{1, 1},
 3176                 {3, 5},
 3177                 {7, 7},
 3178                 {0, 0}
 3179                 }
 3180         },
 3181         {1, 1, 3, 0,            /* 0xbb */
 3182                 {{0, 1},
 3183                 {3, 5},
 3184                 {7, 7},
 3185                 {0, 0}
 3186                 }
 3187         },
 3188         {0, 1, 2, 0,            /* 0xbc */
 3189                 {{2, 5},
 3190                 {7, 7},
 3191                 {0, 0},
 3192                 {0, 0}
 3193                 }
 3194         },
 3195         {1, 1, 3, 0,            /* 0xbd */
 3196                 {{0, 0},
 3197                 {2, 5},
 3198                 {7, 7},
 3199                 {0, 0}
 3200                 }
 3201         },
 3202         {0, 1, 2, 0,            /* 0xbe */
 3203                 {{1, 5},
 3204                 {7, 7},
 3205                 {0, 0},
 3206                 {0, 0}
 3207                 }
 3208         },
 3209         {1, 1, 2, 0,            /* 0xbf */
 3210                 {{0, 5},
 3211                 {7, 7},
 3212                 {0, 0},
 3213                 {0, 0}
 3214                 }
 3215         },
 3216         {0, 1, 1, 0,            /* 0xc0 */
 3217                 {{6, 7},
 3218                 {0, 0},
 3219                 {0, 0},
 3220                 {0, 0}
 3221                 }
 3222         },
 3223         {1, 1, 2, 0,            /* 0xc1 */
 3224                 {{0, 0},
 3225                 {6, 7},
 3226                 {0, 0},
 3227                 {0, 0}
 3228                 }
 3229         },
 3230         {0, 1, 2, 0,            /* 0xc2 */
 3231                 {{1, 1},
 3232                 {6, 7},
 3233                 {0, 0},
 3234                 {0, 0}
 3235                 }
 3236         },
 3237         {1, 1, 2, 0,            /* 0xc3 */
 3238                 {{0, 1},
 3239                 {6, 7},
 3240                 {0, 0},
 3241                 {0, 0}
 3242                 }
 3243         },
 3244         {0, 1, 2, 0,            /* 0xc4 */
 3245                 {{2, 2},
 3246                 {6, 7},
 3247                 {0, 0},
 3248                 {0, 0}
 3249                 }
 3250         },
 3251         {1, 1, 3, 0,            /* 0xc5 */
 3252                 {{0, 0},
 3253                 {2, 2},
 3254                 {6, 7},
 3255                 {0, 0}
 3256                 }
 3257         },
 3258         {0, 1, 2, 0,            /* 0xc6 */
 3259                 {{1, 2},
 3260                 {6, 7},
 3261                 {0, 0},
 3262                 {0, 0}
 3263                 }
 3264         },
 3265         {1, 1, 2, 0,            /* 0xc7 */
 3266                 {{0, 2},
 3267                 {6, 7},
 3268                 {0, 0},
 3269                 {0, 0}
 3270                 }
 3271         },
 3272         {0, 1, 2, 0,            /* 0xc8 */
 3273                 {{3, 3},
 3274                 {6, 7},
 3275                 {0, 0},
 3276                 {0, 0}
 3277                 }
 3278         },
 3279         {1, 1, 3, 0,            /* 0xc9 */
 3280                 {{0, 0},
 3281                 {3, 3},
 3282                 {6, 7},
 3283                 {0, 0}
 3284                 }
 3285         },
 3286         {0, 1, 3, 0,            /* 0xca */
 3287                 {{1, 1},
 3288                 {3, 3},
 3289                 {6, 7},
 3290                 {0, 0}
 3291                 }
 3292         },
 3293         {1, 1, 3, 0,            /* 0xcb */
 3294                 {{0, 1},
 3295                 {3, 3},
 3296                 {6, 7},
 3297                 {0, 0}
 3298                 }
 3299         },
 3300         {0, 1, 2, 0,            /* 0xcc */
 3301                 {{2, 3},
 3302                 {6, 7},
 3303                 {0, 0},
 3304                 {0, 0}
 3305                 }
 3306         },
 3307         {1, 1, 3, 0,            /* 0xcd */
 3308                 {{0, 0},
 3309                 {2, 3},
 3310                 {6, 7},
 3311                 {0, 0}
 3312                 }
 3313         },
 3314         {0, 1, 2, 0,            /* 0xce */
 3315                 {{1, 3},
 3316                 {6, 7},
 3317                 {0, 0},
 3318                 {0, 0}
 3319                 }
 3320         },
 3321         {1, 1, 2, 0,            /* 0xcf */
 3322                 {{0, 3},
 3323                 {6, 7},
 3324                 {0, 0},
 3325                 {0, 0}
 3326                 }
 3327         },
 3328         {0, 1, 2, 0,            /* 0xd0 */
 3329                 {{4, 4},
 3330                 {6, 7},
 3331                 {0, 0},
 3332                 {0, 0}
 3333                 }
 3334         },
 3335         {1, 1, 3, 0,            /* 0xd1 */
 3336                 {{0, 0},
 3337                 {4, 4},
 3338                 {6, 7},
 3339                 {0, 0}
 3340                 }
 3341         },
 3342         {0, 1, 3, 0,            /* 0xd2 */
 3343                 {{1, 1},
 3344                 {4, 4},
 3345                 {6, 7},
 3346                 {0, 0}
 3347                 }
 3348         },
 3349         {1, 1, 3, 0,            /* 0xd3 */
 3350                 {{0, 1},
 3351                 {4, 4},
 3352                 {6, 7},
 3353                 {0, 0}
 3354                 }
 3355         },
 3356         {0, 1, 3, 0,            /* 0xd4 */
 3357                 {{2, 2},
 3358                 {4, 4},
 3359                 {6, 7},
 3360                 {0, 0}
 3361                 }
 3362         },
 3363         {1, 1, 4, 0,            /* 0xd5 */
 3364                 {{0, 0},
 3365                 {2, 2},
 3366                 {4, 4},
 3367                 {6, 7}
 3368                 }
 3369         },
 3370         {0, 1, 3, 0,            /* 0xd6 */
 3371                 {{1, 2},
 3372                 {4, 4},
 3373                 {6, 7},
 3374                 {0, 0}
 3375                 }
 3376         },
 3377         {1, 1, 3, 0,            /* 0xd7 */
 3378                 {{0, 2},
 3379                 {4, 4},
 3380                 {6, 7},
 3381                 {0, 0}
 3382                 }
 3383         },
 3384         {0, 1, 2, 0,            /* 0xd8 */
 3385                 {{3, 4},
 3386                 {6, 7},
 3387                 {0, 0},
 3388                 {0, 0}
 3389                 }
 3390         },
 3391         {1, 1, 3, 0,            /* 0xd9 */
 3392                 {{0, 0},
 3393                 {3, 4},
 3394                 {6, 7},
 3395                 {0, 0}
 3396                 }
 3397         },
 3398         {0, 1, 3, 0,            /* 0xda */
 3399                 {{1, 1},
 3400                 {3, 4},
 3401                 {6, 7},
 3402                 {0, 0}
 3403                 }
 3404         },
 3405         {1, 1, 3, 0,            /* 0xdb */
 3406                 {{0, 1},
 3407                 {3, 4},
 3408                 {6, 7},
 3409                 {0, 0}
 3410                 }
 3411         },
 3412         {0, 1, 2, 0,            /* 0xdc */
 3413                 {{2, 4},
 3414                 {6, 7},
 3415                 {0, 0},
 3416                 {0, 0}
 3417                 }
 3418         },
 3419         {1, 1, 3, 0,            /* 0xdd */
 3420                 {{0, 0},
 3421                 {2, 4},
 3422                 {6, 7},
 3423                 {0, 0}
 3424                 }
 3425         },
 3426         {0, 1, 2, 0,            /* 0xde */
 3427                 {{1, 4},
 3428                 {6, 7},
 3429                 {0, 0},
 3430                 {0, 0}
 3431                 }
 3432         },
 3433         {1, 1, 2, 0,            /* 0xdf */
 3434                 {{0, 4},
 3435                 {6, 7},
 3436                 {0, 0},
 3437                 {0, 0}
 3438                 }
 3439         },
 3440         {0, 1, 1, 0,            /* 0xe0 */
 3441                 {{5, 7},
 3442                 {0, 0},
 3443                 {0, 0},
 3444                 {0, 0}
 3445                 }
 3446         },
 3447         {1, 1, 2, 0,            /* 0xe1 */
 3448                 {{0, 0},
 3449                 {5, 7},
 3450                 {0, 0},
 3451                 {0, 0}
 3452                 }
 3453         },
 3454         {0, 1, 2, 0,            /* 0xe2 */
 3455                 {{1, 1},
 3456                 {5, 7},
 3457                 {0, 0},
 3458                 {0, 0}
 3459                 }
 3460         },
 3461         {1, 1, 2, 0,            /* 0xe3 */
 3462                 {{0, 1},
 3463                 {5, 7},
 3464                 {0, 0},
 3465                 {0, 0}
 3466                 }
 3467         },
 3468         {0, 1, 2, 0,            /* 0xe4 */
 3469                 {{2, 2},
 3470                 {5, 7},
 3471                 {0, 0},
 3472                 {0, 0}
 3473                 }
 3474         },
 3475         {1, 1, 3, 0,            /* 0xe5 */
 3476                 {{0, 0},
 3477                 {2, 2},
 3478                 {5, 7},
 3479                 {0, 0}
 3480                 }
 3481         },
 3482         {0, 1, 2, 0,            /* 0xe6 */
 3483                 {{1, 2},
 3484                 {5, 7},
 3485                 {0, 0},
 3486                 {0, 0}
 3487                 }
 3488         },
 3489         {1, 1, 2, 0,            /* 0xe7 */
 3490                 {{0, 2},
 3491                 {5, 7},
 3492                 {0, 0},
 3493                 {0, 0}
 3494                 }
 3495         },
 3496         {0, 1, 2, 0,            /* 0xe8 */
 3497                 {{3, 3},
 3498                 {5, 7},
 3499                 {0, 0},
 3500                 {0, 0}
 3501                 }
 3502         },
 3503         {1, 1, 3, 0,            /* 0xe9 */
 3504                 {{0, 0},
 3505                 {3, 3},
 3506                 {5, 7},
 3507                 {0, 0}
 3508                 }
 3509         },
 3510         {0, 1, 3, 0,            /* 0xea */
 3511                 {{1, 1},
 3512                 {3, 3},
 3513                 {5, 7},
 3514                 {0, 0}
 3515                 }
 3516         },
 3517         {1, 1, 3, 0,            /* 0xeb */
 3518                 {{0, 1},
 3519                 {3, 3},
 3520                 {5, 7},
 3521                 {0, 0}
 3522                 }
 3523         },
 3524         {0, 1, 2, 0,            /* 0xec */
 3525                 {{2, 3},
 3526                 {5, 7},
 3527                 {0, 0},
 3528                 {0, 0}
 3529                 }
 3530         },
 3531         {1, 1, 3, 0,            /* 0xed */
 3532                 {{0, 0},
 3533                 {2, 3},
 3534                 {5, 7},
 3535                 {0, 0}
 3536                 }
 3537         },
 3538         {0, 1, 2, 0,            /* 0xee */
 3539                 {{1, 3},
 3540                 {5, 7},
 3541                 {0, 0},
 3542                 {0, 0}
 3543                 }
 3544         },
 3545         {1, 1, 2, 0,            /* 0xef */
 3546                 {{0, 3},
 3547                 {5, 7},
 3548                 {0, 0},
 3549                 {0, 0}
 3550                 }
 3551         },
 3552         {0, 1, 1, 0,            /* 0xf0 */
 3553                 {{4, 7},
 3554                 {0, 0},
 3555                 {0, 0},
 3556                 {0, 0}
 3557                 }
 3558         },
 3559         {1, 1, 2, 0,            /* 0xf1 */
 3560                 {{0, 0},
 3561                 {4, 7},
 3562                 {0, 0},
 3563                 {0, 0}
 3564                 }
 3565         },
 3566         {0, 1, 2, 0,            /* 0xf2 */
 3567                 {{1, 1},
 3568                 {4, 7},
 3569                 {0, 0},
 3570                 {0, 0}
 3571                 }
 3572         },
 3573         {1, 1, 2, 0,            /* 0xf3 */
 3574                 {{0, 1},
 3575                 {4, 7},
 3576                 {0, 0},
 3577                 {0, 0}
 3578                 }
 3579         },
 3580         {0, 1, 2, 0,            /* 0xf4 */
 3581                 {{2, 2},
 3582                 {4, 7},
 3583                 {0, 0},
 3584                 {0, 0}
 3585                 }
 3586         },
 3587         {1, 1, 3, 0,            /* 0xf5 */
 3588                 {{0, 0},
 3589                 {2, 2},
 3590                 {4, 7},
 3591                 {0, 0}
 3592                 }
 3593         },
 3594         {0, 1, 2, 0,            /* 0xf6 */
 3595                 {{1, 2},
 3596                 {4, 7},
 3597                 {0, 0},
 3598                 {0, 0}
 3599                 }
 3600         },
 3601         {1, 1, 2, 0,            /* 0xf7 */
 3602                 {{0, 2},
 3603                 {4, 7},
 3604                 {0, 0},
 3605                 {0, 0}
 3606                 }
 3607         },
 3608         {0, 1, 1, 0,            /* 0xf8 */
 3609                 {{3, 7},
 3610                 {0, 0},
 3611                 {0, 0},
 3612                 {0, 0}
 3613                 }
 3614         },
 3615         {1, 1, 2, 0,            /* 0xf9 */
 3616                 {{0, 0},
 3617                 {3, 7},
 3618                 {0, 0},
 3619                 {0, 0}
 3620                 }
 3621         },
 3622         {0, 1, 2, 0,            /* 0xfa */
 3623                 {{1, 1},
 3624                 {3, 7},
 3625                 {0, 0},
 3626                 {0, 0}
 3627                 }
 3628         },
 3629         {1, 1, 2, 0,            /* 0xfb */
 3630                 {{0, 1},
 3631                 {3, 7},
 3632                 {0, 0},
 3633                 {0, 0}
 3634                 }
 3635         },
 3636         {0, 1, 1, 0,            /* 0xfc */
 3637                 {{2, 7},
 3638                 {0, 0},
 3639                 {0, 0},
 3640                 {0, 0}
 3641                 }
 3642         },
 3643         {1, 1, 2, 0,            /* 0xfd */
 3644                 {{0, 0},
 3645                 {2, 7},
 3646                 {0, 0},
 3647                 {0, 0}
 3648                 }
 3649         },
 3650         {0, 1, 1, 0,            /* 0xfe */
 3651                 {{1, 7},
 3652                 {0, 0},
 3653                 {0, 0},
 3654                 {0, 0}
 3655                 }
 3656         },
 3657         {1, 1, 1, 0,            /* 0xff */
 3658                 {{0, 7},
 3659                 {0, 0},
 3660                 {0, 0},
 3661                 {0, 0}
 3662                 }
 3663         }
 3664 };
 3665 
 3666 
 3667 
 3668 int
 3669 sctp_is_address_in_scope(struct sctp_ifa *ifa,
 3670     int ipv4_addr_legal,
 3671     int ipv6_addr_legal,
 3672     int loopback_scope,
 3673     int ipv4_local_scope,
 3674     int local_scope,
 3675     int site_scope,
 3676     int do_update)
 3677 {
 3678         if ((loopback_scope == 0) &&
 3679             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
 3680                 /*
 3681                  * skip loopback if not in scope *
 3682                  */
 3683                 return (0);
 3684         }
 3685         switch (ifa->address.sa.sa_family) {
 3686         case AF_INET:
 3687                 if (ipv4_addr_legal) {
 3688                         struct sockaddr_in *sin;
 3689 
 3690                         sin = (struct sockaddr_in *)&ifa->address.sin;
 3691                         if (sin->sin_addr.s_addr == 0) {
 3692                                 /* not in scope , unspecified */
 3693                                 return (0);
 3694                         }
 3695                         if ((ipv4_local_scope == 0) &&
 3696                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 3697                                 /* private address not in scope */
 3698                                 return (0);
 3699                         }
 3700                 } else {
 3701                         return (0);
 3702                 }
 3703                 break;
 3704 #ifdef INET6
 3705         case AF_INET6:
 3706                 if (ipv6_addr_legal) {
 3707                         struct sockaddr_in6 *sin6;
 3708 
 3709                         /*
 3710                          * Must update the flags,  bummer, which means any
 3711                          * IFA locks must now be applied HERE <->
 3712                          */
 3713                         if (do_update) {
 3714                                 sctp_gather_internal_ifa_flags(ifa);
 3715                         }
 3716                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 3717                                 return (0);
 3718                         }
 3719                         /* ok to use deprecated addresses? */
 3720                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
 3721                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 3722                                 /* skip unspecifed addresses */
 3723                                 return (0);
 3724                         }
 3725                         if (    /* (local_scope == 0) && */
 3726                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
 3727                                 return (0);
 3728                         }
 3729                         if ((site_scope == 0) &&
 3730                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 3731                                 return (0);
 3732                         }
 3733                 } else {
 3734                         return (0);
 3735                 }
 3736                 break;
 3737 #endif
 3738         default:
 3739                 return (0);
 3740         }
 3741         return (1);
 3742 }
 3743 
 3744 static struct mbuf *
 3745 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
 3746 {
 3747         struct sctp_paramhdr *parmh;
 3748         struct mbuf *mret;
 3749         int len;
 3750 
 3751         if (ifa->address.sa.sa_family == AF_INET) {
 3752                 len = sizeof(struct sctp_ipv4addr_param);
 3753         } else if (ifa->address.sa.sa_family == AF_INET6) {
 3754                 len = sizeof(struct sctp_ipv6addr_param);
 3755         } else {
 3756                 /* unknown type */
 3757                 return (m);
 3758         }
 3759         if (M_TRAILINGSPACE(m) >= len) {
 3760                 /* easy side we just drop it on the end */
 3761                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
 3762                 mret = m;
 3763         } else {
 3764                 /* Need more space */
 3765                 mret = m;
 3766                 while (SCTP_BUF_NEXT(mret) != NULL) {
 3767                         mret = SCTP_BUF_NEXT(mret);
 3768                 }
 3769                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
 3770                 if (SCTP_BUF_NEXT(mret) == NULL) {
 3771                         /* We are hosed, can't add more addresses */
 3772                         return (m);
 3773                 }
 3774                 mret = SCTP_BUF_NEXT(mret);
 3775                 parmh = mtod(mret, struct sctp_paramhdr *);
 3776         }
 3777         /* now add the parameter */
 3778         switch (ifa->address.sa.sa_family) {
 3779         case AF_INET:
 3780                 {
 3781                         struct sctp_ipv4addr_param *ipv4p;
 3782                         struct sockaddr_in *sin;
 3783 
 3784                         sin = (struct sockaddr_in *)&ifa->address.sin;
 3785                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
 3786                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
 3787                         parmh->param_length = htons(len);
 3788                         ipv4p->addr = sin->sin_addr.s_addr;
 3789                         SCTP_BUF_LEN(mret) += len;
 3790                         break;
 3791                 }
 3792 #ifdef INET6
 3793         case AF_INET6:
 3794                 {
 3795                         struct sctp_ipv6addr_param *ipv6p;
 3796                         struct sockaddr_in6 *sin6;
 3797 
 3798                         sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
 3799                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
 3800                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
 3801                         parmh->param_length = htons(len);
 3802                         memcpy(ipv6p->addr, &sin6->sin6_addr,
 3803                             sizeof(ipv6p->addr));
 3804                         /* clear embedded scope in the address */
 3805                         in6_clearscope((struct in6_addr *)ipv6p->addr);
 3806                         SCTP_BUF_LEN(mret) += len;
 3807                         break;
 3808                 }
 3809 #endif
 3810         default:
 3811                 return (m);
 3812         }
 3813         return (mret);
 3814 }
 3815 
 3816 
 3817 struct mbuf *
 3818 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
 3819     struct mbuf *m_at, int cnt_inits_to)
 3820 {
 3821         struct sctp_vrf *vrf = NULL;
 3822         int cnt, limit_out = 0, total_count;
 3823         uint32_t vrf_id;
 3824 
 3825         vrf_id = inp->def_vrf_id;
 3826         SCTP_IPI_ADDR_RLOCK();
 3827         vrf = sctp_find_vrf(vrf_id);
 3828         if (vrf == NULL) {
 3829                 SCTP_IPI_ADDR_RUNLOCK();
 3830                 return (m_at);
 3831         }
 3832         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3833                 struct sctp_ifa *sctp_ifap;
 3834                 struct sctp_ifn *sctp_ifnp;
 3835 
 3836                 cnt = cnt_inits_to;
 3837                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 3838                         limit_out = 1;
 3839                         cnt = SCTP_ADDRESS_LIMIT;
 3840                         goto skip_count;
 3841                 }
 3842                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 3843                         if ((scope->loopback_scope == 0) &&
 3844                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 3845                                 /*
 3846                                  * Skip loopback devices if loopback_scope
 3847                                  * not set
 3848                                  */
 3849                                 continue;
 3850                         }
 3851                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 3852                                 if (sctp_is_address_in_scope(sctp_ifap,
 3853                                     scope->ipv4_addr_legal,
 3854                                     scope->ipv6_addr_legal,
 3855                                     scope->loopback_scope,
 3856                                     scope->ipv4_local_scope,
 3857                                     scope->local_scope,
 3858                                     scope->site_scope, 1) == 0) {
 3859                                         continue;
 3860                                 }
 3861                                 cnt++;
 3862                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 3863                                         break;
 3864                                 }
 3865                         }
 3866                         if (cnt > SCTP_ADDRESS_LIMIT) {
 3867                                 break;
 3868                         }
 3869                 }
 3870 skip_count:
 3871                 if (cnt > 1) {
 3872                         total_count = 0;
 3873                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 3874                                 cnt = 0;
 3875                                 if ((scope->loopback_scope == 0) &&
 3876                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 3877                                         /*
 3878                                          * Skip loopback devices if
 3879                                          * loopback_scope not set
 3880                                          */
 3881                                         continue;
 3882                                 }
 3883                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 3884                                         if (sctp_is_address_in_scope(sctp_ifap,
 3885                                             scope->ipv4_addr_legal,
 3886                                             scope->ipv6_addr_legal,
 3887                                             scope->loopback_scope,
 3888                                             scope->ipv4_local_scope,
 3889                                             scope->local_scope,
 3890                                             scope->site_scope, 0) == 0) {
 3891                                                 continue;
 3892                                         }
 3893                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
 3894                                         if (limit_out) {
 3895                                                 cnt++;
 3896                                                 total_count++;
 3897                                                 if (cnt >= 2) {
 3898                                                         /*
 3899                                                          * two from each
 3900                                                          * address
 3901                                                          */
 3902                                                         break;
 3903                                                 }
 3904                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 3905                                                         /* No more addresses */
 3906                                                         break;
 3907                                                 }
 3908                                         }
 3909                                 }
 3910                         }
 3911                 }
 3912         } else {
 3913                 struct sctp_laddr *laddr;
 3914 
 3915                 cnt = cnt_inits_to;
 3916                 /* First, how many ? */
 3917                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 3918                         if (laddr->ifa == NULL) {
 3919                                 continue;
 3920                         }
 3921                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 3922                                 /*
 3923                                  * Address being deleted by the system, dont
 3924                                  * list.
 3925                                  */
 3926                                 continue;
 3927                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 3928                                 /*
 3929                                  * Address being deleted on this ep don't
 3930                                  * list.
 3931                                  */
 3932                                 continue;
 3933                         }
 3934                         if (sctp_is_address_in_scope(laddr->ifa,
 3935                             scope->ipv4_addr_legal,
 3936                             scope->ipv6_addr_legal,
 3937                             scope->loopback_scope,
 3938                             scope->ipv4_local_scope,
 3939                             scope->local_scope,
 3940                             scope->site_scope, 1) == 0) {
 3941                                 continue;
 3942                         }
 3943                         cnt++;
 3944                 }
 3945                 if (cnt > SCTP_ADDRESS_LIMIT) {
 3946                         limit_out = 1;
 3947                 }
 3948                 /*
 3949                  * To get through a NAT we only list addresses if we have
 3950                  * more than one. That way if you just bind a single address
 3951                  * we let the source of the init dictate our address.
 3952                  */
 3953                 if (cnt > 1) {
 3954                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 3955                                 cnt = 0;
 3956                                 if (laddr->ifa == NULL) {
 3957                                         continue;
 3958                                 }
 3959                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 3960                                         continue;
 3961 
 3962                                 if (sctp_is_address_in_scope(laddr->ifa,
 3963                                     scope->ipv4_addr_legal,
 3964                                     scope->ipv6_addr_legal,
 3965                                     scope->loopback_scope,
 3966                                     scope->ipv4_local_scope,
 3967                                     scope->local_scope,
 3968                                     scope->site_scope, 0) == 0) {
 3969                                         continue;
 3970                                 }
 3971                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
 3972                                 cnt++;
 3973                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 3974                                         break;
 3975                                 }
 3976                         }
 3977                 }
 3978         }
 3979         SCTP_IPI_ADDR_RUNLOCK();
 3980         return (m_at);
 3981 }
 3982 
 3983 static struct sctp_ifa *
 3984 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 3985     uint8_t dest_is_loop,
 3986     uint8_t dest_is_priv,
 3987     sa_family_t fam)
 3988 {
 3989         uint8_t dest_is_global = 0;
 3990 
 3991         /* dest_is_priv is true if destination is a private address */
 3992         /* dest_is_loop is true if destination is a loopback addresses */
 3993 
 3994         /*
 3995          * Here we determine if its a preferred address. A preferred address
 3996          * means it is the same scope or higher scope then the destination.
 3997          * L = loopback, P = private, G = global
 3998          * ----------------------------------------- src    |  dest | result
 3999          * ---------------------------------------- L     |    L  |    yes
 4000          * ----------------------------------------- P     |    L  |
 4001          * yes-v4 no-v6 ----------------------------------------- G     |
 4002          * L  |    yes-v4 no-v6 ----------------------------------------- L
 4003          * |    P  |    no ----------------------------------------- P     |
 4004          * P  |    yes ----------------------------------------- G     |
 4005          * P  |    no ----------------------------------------- L     |    G
 4006          * |    no ----------------------------------------- P     |    G  |
 4007          * no ----------------------------------------- G     |    G  |
 4008          * yes -----------------------------------------
 4009          */
 4010 
 4011         if (ifa->address.sa.sa_family != fam) {
 4012                 /* forget mis-matched family */
 4013                 return (NULL);
 4014         }
 4015         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 4016                 dest_is_global = 1;
 4017         }
 4018         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 4019         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 4020         /* Ok the address may be ok */
 4021         if (fam == AF_INET6) {
 4022                 /* ok to use deprecated addresses? no lets not! */
 4023                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 4024                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 4025                         return (NULL);
 4026                 }
 4027                 if (ifa->src_is_priv && !ifa->src_is_loop) {
 4028                         if (dest_is_loop) {
 4029                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 4030                                 return (NULL);
 4031                         }
 4032                 }
 4033                 if (ifa->src_is_glob) {
 4034                         if (dest_is_loop) {
 4035                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 4036                                 return (NULL);
 4037                         }
 4038                 }
 4039         }
 4040         /*
 4041          * Now that we know what is what, implement or table this could in
 4042          * theory be done slicker (it used to be), but this is
 4043          * straightforward and easier to validate :-)
 4044          */
 4045         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 4046             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 4047         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 4048             dest_is_loop, dest_is_priv, dest_is_global);
 4049 
 4050         if ((ifa->src_is_loop) && (dest_is_priv)) {
 4051                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 4052                 return (NULL);
 4053         }
 4054         if ((ifa->src_is_glob) && (dest_is_priv)) {
 4055                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 4056                 return (NULL);
 4057         }
 4058         if ((ifa->src_is_loop) && (dest_is_global)) {
 4059                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 4060                 return (NULL);
 4061         }
 4062         if ((ifa->src_is_priv) && (dest_is_global)) {
 4063                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 4064                 return (NULL);
 4065         }
 4066         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 4067         /* its a preferred address */
 4068         return (ifa);
 4069 }
 4070 
 4071 static struct sctp_ifa *
 4072 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 4073     uint8_t dest_is_loop,
 4074     uint8_t dest_is_priv,
 4075     sa_family_t fam)
 4076 {
 4077         uint8_t dest_is_global = 0;
 4078 
 4079 
 4080         /*
 4081          * Here we determine if its a acceptable address. A acceptable
 4082          * address means it is the same scope or higher scope but we can
 4083          * allow for NAT which means its ok to have a global dest and a
 4084          * private src.
 4085          * 
 4086          * L = loopback, P = private, G = global
 4087          * ----------------------------------------- src    |  dest | result
 4088          * ----------------------------------------- L     |   L   |    yes
 4089          * ----------------------------------------- P     |   L   |
 4090          * yes-v4 no-v6 ----------------------------------------- G     |
 4091          * L   |    yes ----------------------------------------- L     |
 4092          * P   |    no ----------------------------------------- P     |   P
 4093          * |    yes ----------------------------------------- G     |   P
 4094          * |    yes - May not work -----------------------------------------
 4095          * L     |   G   |    no ----------------------------------------- P
 4096          * |   G   |    yes - May not work
 4097          * ----------------------------------------- G     |   G   |    yes
 4098          * -----------------------------------------
 4099          */
 4100 
 4101         if (ifa->address.sa.sa_family != fam) {
 4102                 /* forget non matching family */
 4103                 return (NULL);
 4104         }
 4105         /* Ok the address may be ok */
 4106         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 4107                 dest_is_global = 1;
 4108         }
 4109         if (fam == AF_INET6) {
 4110                 /* ok to use deprecated addresses? */
 4111                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 4112                         return (NULL);
 4113                 }
 4114                 if (ifa->src_is_priv) {
 4115                         /* Special case, linklocal to loop */
 4116                         if (dest_is_loop)
 4117                                 return (NULL);
 4118                 }
 4119         }
 4120         /*
 4121          * Now that we know what is what, implement our table. This could in
 4122          * theory be done slicker (it used to be), but this is
 4123          * straightforward and easier to validate :-)
 4124          */
 4125         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 4126                 return (NULL);
 4127         }
 4128         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 4129                 return (NULL);
 4130         }
 4131         /* its an acceptable address */
 4132         return (ifa);
 4133 }
 4134 
 4135 int
 4136 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 4137 {
 4138         struct sctp_laddr *laddr;
 4139 
 4140         if (stcb == NULL) {
 4141                 /* There are no restrictions, no TCB :-) */
 4142                 return (0);
 4143         }
 4144         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 4145                 if (laddr->ifa == NULL) {
 4146                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 4147                             __FUNCTION__);
 4148                         continue;
 4149                 }
 4150                 if (laddr->ifa == ifa) {
 4151                         /* Yes it is on the list */
 4152                         return (1);
 4153                 }
 4154         }
 4155         return (0);
 4156 }
 4157 
 4158 
 4159 int
 4160 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 4161 {
 4162         struct sctp_laddr *laddr;
 4163 
 4164         if (ifa == NULL)
 4165                 return (0);
 4166         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 4167                 if (laddr->ifa == NULL) {
 4168                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 4169                             __FUNCTION__);
 4170                         continue;
 4171                 }
 4172                 if ((laddr->ifa == ifa) && laddr->action == 0)
 4173                         /* same pointer */
 4174                         return (1);
 4175         }
 4176         return (0);
 4177 }
 4178 
 4179 
 4180 
 4181 static struct sctp_ifa *
 4182 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 4183     sctp_route_t * ro,
 4184     uint32_t vrf_id,
 4185     int non_asoc_addr_ok,
 4186     uint8_t dest_is_priv,
 4187     uint8_t dest_is_loop,
 4188     sa_family_t fam)
 4189 {
 4190         struct sctp_laddr *laddr, *starting_point;
 4191         void *ifn;
 4192         int resettotop = 0;
 4193         struct sctp_ifn *sctp_ifn;
 4194         struct sctp_ifa *sctp_ifa, *sifa;
 4195         struct sctp_vrf *vrf;
 4196         uint32_t ifn_index;
 4197 
 4198         vrf = sctp_find_vrf(vrf_id);
 4199         if (vrf == NULL)
 4200                 return (NULL);
 4201 
 4202         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4203         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 4204         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 4205         /*
 4206          * first question, is the ifn we will emit on in our list, if so, we
 4207          * want such an address. Note that we first looked for a preferred
 4208          * address.
 4209          */
 4210         if (sctp_ifn) {
 4211                 /* is a preferred one on the interface we route out? */
 4212                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 4213                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 4214                             (non_asoc_addr_ok == 0))
 4215                                 continue;
 4216                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 4217                             dest_is_loop,
 4218                             dest_is_priv, fam);
 4219                         if (sifa == NULL)
 4220                                 continue;
 4221                         if (sctp_is_addr_in_ep(inp, sifa)) {
 4222                                 atomic_add_int(&sifa->refcount, 1);
 4223                                 return (sifa);
 4224                         }
 4225                 }
 4226         }
 4227         /*
 4228          * ok, now we now need to find one on the list of the addresses. We
 4229          * can't get one on the emitting interface so let's find first a
 4230          * preferred one. If not that an acceptable one otherwise... we
 4231          * return NULL.
 4232          */
 4233         starting_point = inp->next_addr_touse;
 4234 once_again:
 4235         if (inp->next_addr_touse == NULL) {
 4236                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 4237                 resettotop = 1;
 4238         }
 4239         for (laddr = inp->next_addr_touse; laddr;
 4240             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 4241                 if (laddr->ifa == NULL) {
 4242                         /* address has been removed */
 4243                         continue;
 4244                 }
 4245                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 4246                         /* address is being deleted */
 4247                         continue;
 4248                 }
 4249                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 4250                     dest_is_priv, fam);
 4251                 if (sifa == NULL)
 4252                         continue;
 4253                 atomic_add_int(&sifa->refcount, 1);
 4254                 return (sifa);
 4255         }
 4256         if (resettotop == 0) {
 4257                 inp->next_addr_touse = NULL;
 4258                 goto once_again;
 4259         }
 4260         inp->next_addr_touse = starting_point;
 4261         resettotop = 0;
 4262 once_again_too:
 4263         if (inp->next_addr_touse == NULL) {
 4264                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 4265                 resettotop = 1;
 4266         }
 4267         /* ok, what about an acceptable address in the inp */
 4268         for (laddr = inp->next_addr_touse; laddr;
 4269             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 4270                 if (laddr->ifa == NULL) {
 4271                         /* address has been removed */
 4272                         continue;
 4273                 }
 4274                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 4275                         /* address is being deleted */
 4276                         continue;
 4277                 }
 4278                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 4279                     dest_is_priv, fam);
 4280                 if (sifa == NULL)
 4281                         continue;
 4282                 atomic_add_int(&sifa->refcount, 1);
 4283                 return (sifa);
 4284         }
 4285         if (resettotop == 0) {
 4286                 inp->next_addr_touse = NULL;
 4287                 goto once_again_too;
 4288         }
 4289         /*
 4290          * no address bound can be a source for the destination we are in
 4291          * trouble
 4292          */
 4293         return (NULL);
 4294 }
 4295 
 4296 
 4297 
 4298 static struct sctp_ifa *
 4299 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 4300     struct sctp_tcb *stcb,
 4301     struct sctp_nets *net,
 4302     sctp_route_t * ro,
 4303     uint32_t vrf_id,
 4304     uint8_t dest_is_priv,
 4305     uint8_t dest_is_loop,
 4306     int non_asoc_addr_ok,
 4307     sa_family_t fam)
 4308 {
 4309         struct sctp_laddr *laddr, *starting_point;
 4310         void *ifn;
 4311         struct sctp_ifn *sctp_ifn;
 4312         struct sctp_ifa *sctp_ifa, *sifa;
 4313         uint8_t start_at_beginning = 0;
 4314         struct sctp_vrf *vrf;
 4315         uint32_t ifn_index;
 4316 
 4317         /*
 4318          * first question, is the ifn we will emit on in our list, if so, we
 4319          * want that one.
 4320          */
 4321         vrf = sctp_find_vrf(vrf_id);
 4322         if (vrf == NULL)
 4323                 return (NULL);
 4324 
 4325         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4326         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 4327         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 4328 
 4329         /*
 4330          * first question, is the ifn we will emit on in our list?  If so,
 4331          * we want that one. First we look for a preferred. Second, we go
 4332          * for an acceptable.
 4333          */
 4334         if (sctp_ifn) {
 4335                 /* first try for a preferred address on the ep */
 4336                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 4337                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 4338                                 continue;
 4339                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 4340                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 4341                                 if (sifa == NULL)
 4342                                         continue;
 4343                                 if (((non_asoc_addr_ok == 0) &&
 4344                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 4345                                     (non_asoc_addr_ok &&
 4346                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 4347                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 4348                                         /* on the no-no list */
 4349                                         continue;
 4350                                 }
 4351                                 atomic_add_int(&sifa->refcount, 1);
 4352                                 return (sifa);
 4353                         }
 4354                 }
 4355                 /* next try for an acceptable address on the ep */
 4356                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 4357                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 4358                                 continue;
 4359                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 4360                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 4361                                 if (sifa == NULL)
 4362                                         continue;
 4363                                 if (((non_asoc_addr_ok == 0) &&
 4364                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 4365                                     (non_asoc_addr_ok &&
 4366                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 4367                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 4368                                         /* on the no-no list */
 4369                                         continue;
 4370                                 }
 4371                                 atomic_add_int(&sifa->refcount, 1);
 4372                                 return (sifa);
 4373                         }
 4374                 }
 4375 
 4376         }
 4377         /*
 4378          * if we can't find one like that then we must look at all addresses
 4379          * bound to pick one at first preferable then secondly acceptable.
 4380          */
 4381         starting_point = stcb->asoc.last_used_address;
 4382 sctp_from_the_top:
 4383         if (stcb->asoc.last_used_address == NULL) {
 4384                 start_at_beginning = 1;
 4385                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 4386         }
 4387         /* search beginning with the last used address */
 4388         for (laddr = stcb->asoc.last_used_address; laddr;
 4389             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 4390                 if (laddr->ifa == NULL) {
 4391                         /* address has been removed */
 4392                         continue;
 4393                 }
 4394                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 4395                         /* address is being deleted */
 4396                         continue;
 4397                 }
 4398                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 4399                 if (sifa == NULL)
 4400                         continue;
 4401                 if (((non_asoc_addr_ok == 0) &&
 4402                     (sctp_is_addr_restricted(stcb, sifa))) ||
 4403                     (non_asoc_addr_ok &&
 4404                     (sctp_is_addr_restricted(stcb, sifa)) &&
 4405                     (!sctp_is_addr_pending(stcb, sifa)))) {
 4406                         /* on the no-no list */
 4407                         continue;
 4408                 }
 4409                 stcb->asoc.last_used_address = laddr;
 4410                 atomic_add_int(&sifa->refcount, 1);
 4411                 return (sifa);
 4412         }
 4413         if (start_at_beginning == 0) {
 4414                 stcb->asoc.last_used_address = NULL;
 4415                 goto sctp_from_the_top;
 4416         }
 4417         /* now try for any higher scope than the destination */
 4418         stcb->asoc.last_used_address = starting_point;
 4419         start_at_beginning = 0;
 4420 sctp_from_the_top2:
 4421         if (stcb->asoc.last_used_address == NULL) {
 4422                 start_at_beginning = 1;
 4423                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 4424         }
 4425         /* search beginning with the last used address */
 4426         for (laddr = stcb->asoc.last_used_address; laddr;
 4427             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 4428                 if (laddr->ifa == NULL) {
 4429                         /* address has been removed */
 4430                         continue;
 4431                 }
 4432                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 4433                         /* address is being deleted */
 4434                         continue;
 4435                 }
 4436                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 4437                     dest_is_priv, fam);
 4438                 if (sifa == NULL)
 4439                         continue;
 4440                 if (((non_asoc_addr_ok == 0) &&
 4441                     (sctp_is_addr_restricted(stcb, sifa))) ||
 4442                     (non_asoc_addr_ok &&
 4443                     (sctp_is_addr_restricted(stcb, sifa)) &&
 4444                     (!sctp_is_addr_pending(stcb, sifa)))) {
 4445                         /* on the no-no list */
 4446                         continue;
 4447                 }
 4448                 stcb->asoc.last_used_address = laddr;
 4449                 atomic_add_int(&sifa->refcount, 1);
 4450                 return (sifa);
 4451         }
 4452         if (start_at_beginning == 0) {
 4453                 stcb->asoc.last_used_address = NULL;
 4454                 goto sctp_from_the_top2;
 4455         }
 4456         return (NULL);
 4457 }
 4458 
 4459 static struct sctp_ifa *
 4460 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 4461     struct sctp_tcb *stcb,
 4462     int non_asoc_addr_ok,
 4463     uint8_t dest_is_loop,
 4464     uint8_t dest_is_priv,
 4465     int addr_wanted,
 4466     sa_family_t fam,
 4467     sctp_route_t * ro
 4468 )
 4469 {
 4470         struct sctp_ifa *ifa, *sifa;
 4471         int num_eligible_addr = 0;
 4472 
 4473 #ifdef INET6
 4474         struct sockaddr_in6 sin6, lsa6;
 4475 
 4476         if (fam == AF_INET6) {
 4477                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
 4478                 (void)sa6_recoverscope(&sin6);
 4479         }
 4480 #endif                          /* INET6 */
 4481         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 4482                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 4483                     (non_asoc_addr_ok == 0))
 4484                         continue;
 4485                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 4486                     dest_is_priv, fam);
 4487                 if (sifa == NULL)
 4488                         continue;
 4489 #ifdef INET6
 4490                 if (fam == AF_INET6 &&
 4491                     dest_is_loop &&
 4492                     sifa->src_is_loop && sifa->src_is_priv) {
 4493                         /*
 4494                          * don't allow fe80::1 to be a src on loop ::1, we
 4495                          * don't list it to the peer so we will get an
 4496                          * abort.
 4497                          */
 4498                         continue;
 4499                 }
 4500                 if (fam == AF_INET6 &&
 4501                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
 4502                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
 4503                         /*
 4504                          * link-local <-> link-local must belong to the same
 4505                          * scope.
 4506                          */
 4507                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
 4508                         (void)sa6_recoverscope(&lsa6);
 4509                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
 4510                                 continue;
 4511                         }
 4512                 }
 4513 #endif                          /* INET6 */
 4514 
 4515                 /*
 4516                  * Check if the IPv6 address matches to next-hop. In the
 4517                  * mobile case, old IPv6 address may be not deleted from the
 4518                  * interface. Then, the interface has previous and new
 4519                  * addresses.  We should use one corresponding to the
 4520                  * next-hop.  (by micchie)
 4521                  */
 4522 #ifdef INET6
 4523                 if (stcb && fam == AF_INET6 &&
 4524                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 4525                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
 4526                             == 0) {
 4527                                 continue;
 4528                         }
 4529                 }
 4530 #endif
 4531                 /* Avoid topologically incorrect IPv4 address */
 4532                 if (stcb && fam == AF_INET &&
 4533                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 4534                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 4535                                 continue;
 4536                         }
 4537                 }
 4538                 if (stcb) {
 4539                         if (((non_asoc_addr_ok == 0) &&
 4540                             (sctp_is_addr_restricted(stcb, sifa))) ||
 4541                             (non_asoc_addr_ok &&
 4542                             (sctp_is_addr_restricted(stcb, sifa)) &&
 4543                             (!sctp_is_addr_pending(stcb, sifa)))) {
 4544                                 /*
 4545                                  * It is restricted for some reason..
 4546                                  * probably not yet added.
 4547                                  */
 4548                                 continue;
 4549                         }
 4550                 }
 4551                 if (num_eligible_addr >= addr_wanted) {
 4552                         return (sifa);
 4553                 }
 4554                 num_eligible_addr++;
 4555         }
 4556         return (NULL);
 4557 }
 4558 
 4559 
 4560 static int
 4561 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 4562     struct sctp_tcb *stcb,
 4563     int non_asoc_addr_ok,
 4564     uint8_t dest_is_loop,
 4565     uint8_t dest_is_priv,
 4566     sa_family_t fam)
 4567 {
 4568         struct sctp_ifa *ifa, *sifa;
 4569         int num_eligible_addr = 0;
 4570 
 4571         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 4572                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 4573                     (non_asoc_addr_ok == 0)) {
 4574                         continue;
 4575                 }
 4576                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 4577                     dest_is_priv, fam);
 4578                 if (sifa == NULL) {
 4579                         continue;
 4580                 }
 4581                 if (stcb) {
 4582                         if (((non_asoc_addr_ok == 0) &&
 4583                             (sctp_is_addr_restricted(stcb, sifa))) ||
 4584                             (non_asoc_addr_ok &&
 4585                             (sctp_is_addr_restricted(stcb, sifa)) &&
 4586                             (!sctp_is_addr_pending(stcb, sifa)))) {
 4587                                 /*
 4588                                  * It is restricted for some reason..
 4589                                  * probably not yet added.
 4590                                  */
 4591                                 continue;
 4592                         }
 4593                 }
 4594                 num_eligible_addr++;
 4595         }
 4596         return (num_eligible_addr);
 4597 }
 4598 
 4599 static struct sctp_ifa *
 4600 sctp_choose_boundall(struct sctp_inpcb *inp,
 4601     struct sctp_tcb *stcb,
 4602     struct sctp_nets *net,
 4603     sctp_route_t * ro,
 4604     uint32_t vrf_id,
 4605     uint8_t dest_is_priv,
 4606     uint8_t dest_is_loop,
 4607     int non_asoc_addr_ok,
 4608     sa_family_t fam)
 4609 {
 4610         int cur_addr_num = 0, num_preferred = 0;
 4611         void *ifn;
 4612         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 4613         struct sctp_ifa *sctp_ifa, *sifa;
 4614         uint32_t ifn_index;
 4615         struct sctp_vrf *vrf;
 4616 
 4617         /*-
 4618          * For boundall we can use any address in the association.
 4619          * If non_asoc_addr_ok is set we can use any address (at least in
 4620          * theory). So we look for preferred addresses first. If we find one,
 4621          * we use it. Otherwise we next try to get an address on the
 4622          * interface, which we should be able to do (unless non_asoc_addr_ok
 4623          * is false and we are routed out that way). In these cases where we
 4624          * can't use the address of the interface we go through all the
 4625          * ifn's looking for an address we can use and fill that in. Punting
 4626          * means we send back address 0, which will probably cause problems
 4627          * actually since then IP will fill in the address of the route ifn,
 4628          * which means we probably already rejected it.. i.e. here comes an
 4629          * abort :-<.
 4630          */
 4631         vrf = sctp_find_vrf(vrf_id);
 4632         if (vrf == NULL)
 4633                 return (NULL);
 4634 
 4635         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4636         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 4637         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 4638         if (sctp_ifn == NULL) {
 4639                 /* ?? We don't have this guy ?? */
 4640                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 4641                 goto bound_all_plan_b;
 4642         }
 4643         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 4644             ifn_index, sctp_ifn->ifn_name);
 4645 
 4646         if (net) {
 4647                 cur_addr_num = net->indx_of_eligible_next_to_use;
 4648         }
 4649         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 4650             stcb,
 4651             non_asoc_addr_ok,
 4652             dest_is_loop,
 4653             dest_is_priv, fam);
 4654         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 4655             num_preferred, sctp_ifn->ifn_name);
 4656         if (num_preferred == 0) {
 4657                 /*
 4658                  * no eligible addresses, we must use some other interface
 4659                  * address if we can find one.
 4660                  */
 4661                 goto bound_all_plan_b;
 4662         }
 4663         /*
 4664          * Ok we have num_eligible_addr set with how many we can use, this
 4665          * may vary from call to call due to addresses being deprecated
 4666          * etc..
 4667          */
 4668         if (cur_addr_num >= num_preferred) {
 4669                 cur_addr_num = 0;
 4670         }
 4671         /*
 4672          * select the nth address from the list (where cur_addr_num is the
 4673          * nth) and 0 is the first one, 1 is the second one etc...
 4674          */
 4675         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 4676 
 4677         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
 4678             dest_is_priv, cur_addr_num, fam, ro);
 4679 
 4680         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 4681         if (sctp_ifa) {
 4682                 atomic_add_int(&sctp_ifa->refcount, 1);
 4683                 if (net) {
 4684                         /* save off where the next one we will want */
 4685                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 4686                 }
 4687                 return (sctp_ifa);
 4688         }
 4689         /*
 4690          * plan_b: Look at all interfaces and find a preferred address. If
 4691          * no preferred fall through to plan_c.
 4692          */
 4693 bound_all_plan_b:
 4694         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 4695         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 4696                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 4697                     sctp_ifn->ifn_name);
 4698                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 4699                         /* wrong base scope */
 4700                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 4701                         continue;
 4702                 }
 4703                 if ((sctp_ifn == looked_at) && looked_at) {
 4704                         /* already looked at this guy */
 4705                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 4706                         continue;
 4707                 }
 4708                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
 4709                     dest_is_loop, dest_is_priv, fam);
 4710                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 4711                     "Found ifn:%p %d preferred source addresses\n",
 4712                     ifn, num_preferred);
 4713                 if (num_preferred == 0) {
 4714                         /* None on this interface. */
 4715                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
 4716                         continue;
 4717                 }
 4718                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 4719                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 4720                     num_preferred, sctp_ifn, cur_addr_num);
 4721 
 4722                 /*
 4723                  * Ok we have num_eligible_addr set with how many we can
 4724                  * use, this may vary from call to call due to addresses
 4725                  * being deprecated etc..
 4726                  */
 4727                 if (cur_addr_num >= num_preferred) {
 4728                         cur_addr_num = 0;
 4729                 }
 4730                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
 4731                     dest_is_priv, cur_addr_num, fam, ro);
 4732                 if (sifa == NULL)
 4733                         continue;
 4734                 if (net) {
 4735                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 4736                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 4737                             cur_addr_num);
 4738                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 4739                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 4740                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 4741                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 4742                 }
 4743                 atomic_add_int(&sifa->refcount, 1);
 4744                 return (sifa);
 4745 
 4746         }
 4747 
 4748         /* plan_c: do we have an acceptable address on the emit interface */
 4749         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 4750         if (emit_ifn == NULL) {
 4751                 goto plan_d;
 4752         }
 4753         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 4754                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 4755                     (non_asoc_addr_ok == 0))
 4756                         continue;
 4757                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 4758                     dest_is_priv, fam);
 4759                 if (sifa == NULL)
 4760                         continue;
 4761                 if (stcb) {
 4762                         if (((non_asoc_addr_ok == 0) &&
 4763                             (sctp_is_addr_restricted(stcb, sifa))) ||
 4764                             (non_asoc_addr_ok &&
 4765                             (sctp_is_addr_restricted(stcb, sifa)) &&
 4766                             (!sctp_is_addr_pending(stcb, sifa)))) {
 4767                                 /*
 4768                                  * It is restricted for some reason..
 4769                                  * probably not yet added.
 4770                                  */
 4771                                 continue;
 4772                         }
 4773                 }
 4774                 atomic_add_int(&sifa->refcount, 1);
 4775                 return (sifa);
 4776         }
 4777 plan_d:
 4778         /*
 4779          * plan_d: We are in trouble. No preferred address on the emit
 4780          * interface. And not even a preferred address on all interfaces. Go
 4781          * out and see if we can find an acceptable address somewhere
 4782          * amongst all interfaces.
 4783          */
 4784         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
 4785         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 4786                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 4787                         /* wrong base scope */
 4788                         continue;
 4789                 }
 4790                 if ((sctp_ifn == looked_at) && looked_at)
 4791                         /* already looked at this guy */
 4792                         continue;
 4793 
 4794                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 4795                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 4796                             (non_asoc_addr_ok == 0))
 4797                                 continue;
 4798                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 4799                             dest_is_loop,
 4800                             dest_is_priv, fam);
 4801                         if (sifa == NULL)
 4802                                 continue;
 4803                         if (stcb) {
 4804                                 if (((non_asoc_addr_ok == 0) &&
 4805                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 4806                                     (non_asoc_addr_ok &&
 4807                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 4808                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 4809                                         /*
 4810                                          * It is restricted for some
 4811                                          * reason.. probably not yet added.
 4812                                          */
 4813                                         continue;
 4814                                 }
 4815                         }
 4816                         atomic_add_int(&sifa->refcount, 1);
 4817                         return (sifa);
 4818                 }
 4819         }
 4820         /*
 4821          * Ok we can find NO address to source from that is not on our
 4822          * restricted list and non_asoc_address is NOT ok, or it is on our
 4823          * restricted list. We can't source to it :-(
 4824          */
 4825         return (NULL);
 4826 }
 4827 
 4828 
 4829 
 4830 /* tcb may be NULL */
 4831 struct sctp_ifa *
 4832 sctp_source_address_selection(struct sctp_inpcb *inp,
 4833     struct sctp_tcb *stcb,
 4834     sctp_route_t * ro,
 4835     struct sctp_nets *net,
 4836     int non_asoc_addr_ok, uint32_t vrf_id)
 4837 {
 4838         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 4839 
 4840 #ifdef INET6
 4841         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 4842 
 4843 #endif
 4844         struct sctp_ifa *answer;
 4845         uint8_t dest_is_priv, dest_is_loop;
 4846         sa_family_t fam;
 4847 
 4848         /*-
 4849          * Rules: - Find the route if needed, cache if I can. - Look at
 4850          * interface address in route, Is it in the bound list. If so we
 4851          * have the best source. - If not we must rotate amongst the
 4852          * addresses.
 4853          *
 4854          * Cavets and issues
 4855          *
 4856          * Do we need to pay attention to scope. We can have a private address
 4857          * or a global address we are sourcing or sending to. So if we draw
 4858          * it out
 4859          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 4860          * For V4
 4861          *------------------------------------------
 4862          *      source     *      dest  *  result
 4863          * -----------------------------------------
 4864          * <a>  Private    *    Global  *  NAT
 4865          * -----------------------------------------
 4866          * <b>  Private    *    Private *  No problem
 4867          * -----------------------------------------
 4868          * <c>  Global     *    Private *  Huh, How will this work?
 4869          * -----------------------------------------
 4870          * <d>  Global     *    Global  *  No Problem
 4871          *------------------------------------------
 4872          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 4873          * For V6
 4874          *------------------------------------------
 4875          *      source     *      dest  *  result
 4876          * -----------------------------------------
 4877          * <a>  Linklocal  *    Global  *
 4878          * -----------------------------------------
 4879          * <b>  Linklocal  * Linklocal  *  No problem
 4880          * -----------------------------------------
 4881          * <c>  Global     * Linklocal  *  Huh, How will this work?
 4882          * -----------------------------------------
 4883          * <d>  Global     *    Global  *  No Problem
 4884          *------------------------------------------
 4885          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 4886          *
 4887          * And then we add to that what happens if there are multiple addresses
 4888          * assigned to an interface. Remember the ifa on a ifn is a linked
 4889          * list of addresses. So one interface can have more than one IP
 4890          * address. What happens if we have both a private and a global
 4891          * address? Do we then use context of destination to sort out which
 4892          * one is best? And what about NAT's sending P->G may get you a NAT
 4893          * translation, or should you select the G thats on the interface in
 4894          * preference.
 4895          *
 4896          * Decisions:
 4897          *
 4898          * - count the number of addresses on the interface.
 4899          * - if it is one, no problem except case <c>.
 4900          *   For <a> we will assume a NAT out there.
 4901          * - if there are more than one, then we need to worry about scope P
 4902          *   or G. We should prefer G -> G and P -> P if possible.
 4903          *   Then as a secondary fall back to mixed types G->P being a last
 4904          *   ditch one.
 4905          * - The above all works for bound all, but bound specific we need to
 4906          *   use the same concept but instead only consider the bound
 4907          *   addresses. If the bound set is NOT assigned to the interface then
 4908          *   we must use rotation amongst the bound addresses..
 4909          */
 4910         if (ro->ro_rt == NULL) {
 4911                 /*
 4912                  * Need a route to cache.
 4913                  */
 4914                 SCTP_RTALLOC(ro, vrf_id);
 4915         }
 4916         if (ro->ro_rt == NULL) {
 4917                 return (NULL);
 4918         }
 4919         fam = to->sin_family;
 4920         dest_is_priv = dest_is_loop = 0;
 4921         /* Setup our scopes for the destination */
 4922         switch (fam) {
 4923         case AF_INET:
 4924                 /* Scope based on outbound address */
 4925                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 4926                         dest_is_loop = 1;
 4927                         if (net != NULL) {
 4928                                 /* mark it as local */
 4929                                 net->addr_is_local = 1;
 4930                         }
 4931                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 4932                         dest_is_priv = 1;
 4933                 }
 4934                 break;
 4935 #ifdef INET6
 4936         case AF_INET6:
 4937                 /* Scope based on outbound address */
 4938                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
 4939                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
 4940                         /*
 4941                          * If the address is a loopback address, which
 4942                          * consists of "::1" OR "fe80::1%lo0", we are
 4943                          * loopback scope. But we don't use dest_is_priv
 4944                          * (link local addresses).
 4945                          */
 4946                         dest_is_loop = 1;
 4947                         if (net != NULL) {
 4948                                 /* mark it as local */
 4949                                 net->addr_is_local = 1;
 4950                         }
 4951                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 4952                         dest_is_priv = 1;
 4953                 }
 4954                 break;
 4955 #endif
 4956         }
 4957         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 4958         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
 4959         SCTP_IPI_ADDR_RLOCK();
 4960         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 4961                 /*
 4962                  * Bound all case
 4963                  */
 4964                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 4965                     dest_is_priv, dest_is_loop,
 4966                     non_asoc_addr_ok, fam);
 4967                 SCTP_IPI_ADDR_RUNLOCK();
 4968                 return (answer);
 4969         }
 4970         /*
 4971          * Subset bound case
 4972          */
 4973         if (stcb) {
 4974                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
 4975                     vrf_id, dest_is_priv,
 4976                     dest_is_loop,
 4977                     non_asoc_addr_ok, fam);
 4978         } else {
 4979                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 4980                     non_asoc_addr_ok,
 4981                     dest_is_priv,
 4982                     dest_is_loop, fam);
 4983         }
 4984         SCTP_IPI_ADDR_RUNLOCK();
 4985         return (answer);
 4986 }
 4987 
 4988 static int
 4989 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
 4990 {
 4991         struct cmsghdr cmh;
 4992         int tlen, at;
 4993 
 4994         tlen = SCTP_BUF_LEN(control);
 4995         at = 0;
 4996         /*
 4997          * Independent of how many mbufs, find the c_type inside the control
 4998          * structure and copy out the data.
 4999          */
 5000         while (at < tlen) {
 5001                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 5002                         /* not enough room for one more we are done. */
 5003                         return (0);
 5004                 }
 5005                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 5006                 if (((int)cmh.cmsg_len + at) > tlen) {
 5007                         /*
 5008                          * this is real messed up since there is not enough
 5009                          * data here to cover the cmsg header. We are done.
 5010                          */
 5011                         return (0);
 5012                 }
 5013                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 5014                     (c_type == cmh.cmsg_type)) {
 5015                         /* found the one we want, copy it out */
 5016                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
 5017                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
 5018                                 /*
 5019                                  * space of cmsg_len after header not big
 5020                                  * enough
 5021                                  */
 5022                                 return (0);
 5023                         }
 5024                         m_copydata(control, at, cpsize, data);
 5025                         return (1);
 5026                 } else {
 5027                         at += CMSG_ALIGN(cmh.cmsg_len);
 5028                         if (cmh.cmsg_len == 0) {
 5029                                 break;
 5030                         }
 5031                 }
 5032         }
 5033         /* not found */
 5034         return (0);
 5035 }
 5036 
 5037 static struct mbuf *
 5038 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
 5039     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
 5040 {
 5041         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
 5042         struct sctp_state_cookie *stc;
 5043         struct sctp_paramhdr *ph;
 5044         uint8_t *foo;
 5045         int sig_offset;
 5046         uint16_t cookie_sz;
 5047 
 5048         mret = NULL;
 5049         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 5050             sizeof(struct sctp_paramhdr)), 0,
 5051             M_DONTWAIT, 1, MT_DATA);
 5052         if (mret == NULL) {
 5053                 return (NULL);
 5054         }
 5055         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
 5056         if (copy_init == NULL) {
 5057                 sctp_m_freem(mret);
 5058                 return (NULL);
 5059         }
 5060 #ifdef SCTP_MBUF_LOGGING
 5061         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5062                 struct mbuf *mat;
 5063 
 5064                 mat = copy_init;
 5065                 while (mat) {
 5066                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 5067                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 5068                         }
 5069                         mat = SCTP_BUF_NEXT(mat);
 5070                 }
 5071         }
 5072 #endif
 5073         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 5074             M_DONTWAIT);
 5075         if (copy_initack == NULL) {
 5076                 sctp_m_freem(mret);
 5077                 sctp_m_freem(copy_init);
 5078                 return (NULL);
 5079         }
 5080 #ifdef SCTP_MBUF_LOGGING
 5081         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 5082                 struct mbuf *mat;
 5083 
 5084                 mat = copy_initack;
 5085                 while (mat) {
 5086                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 5087                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 5088                         }
 5089                         mat = SCTP_BUF_NEXT(mat);
 5090                 }
 5091         }
 5092 #endif
 5093         /* easy side we just drop it on the end */
 5094         ph = mtod(mret, struct sctp_paramhdr *);
 5095         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 5096             sizeof(struct sctp_paramhdr);
 5097         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 5098             sizeof(struct sctp_paramhdr));
 5099         ph->param_type = htons(SCTP_STATE_COOKIE);
 5100         ph->param_length = 0;   /* fill in at the end */
 5101         /* Fill in the stc cookie data */
 5102         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 5103 
 5104         /* tack the INIT and then the INIT-ACK onto the chain */
 5105         cookie_sz = 0;
 5106         m_at = mret;
 5107         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 5108                 cookie_sz += SCTP_BUF_LEN(m_at);
 5109                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 5110                         SCTP_BUF_NEXT(m_at) = copy_init;
 5111                         break;
 5112                 }
 5113         }
 5114 
 5115         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 5116                 cookie_sz += SCTP_BUF_LEN(m_at);
 5117                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 5118                         SCTP_BUF_NEXT(m_at) = copy_initack;
 5119                         break;
 5120                 }
 5121         }
 5122 
 5123         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 5124                 cookie_sz += SCTP_BUF_LEN(m_at);
 5125                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 5126                         break;
 5127                 }
 5128         }
 5129         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
 5130         if (sig == NULL) {
 5131                 /* no space, so free the entire chain */
 5132                 sctp_m_freem(mret);
 5133                 return (NULL);
 5134         }
 5135         SCTP_BUF_LEN(sig) = 0;
 5136         SCTP_BUF_NEXT(m_at) = sig;
 5137         sig_offset = 0;
 5138         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
 5139         memset(foo, 0, SCTP_SIGNATURE_SIZE);
 5140         *signature = foo;
 5141         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
 5142         cookie_sz += SCTP_SIGNATURE_SIZE;
 5143         ph->param_length = htons(cookie_sz);
 5144         return (mret);
 5145 }
 5146 
 5147 
 5148 static uint8_t
 5149 sctp_get_ect(struct sctp_tcb *stcb,
 5150     struct sctp_tmit_chunk *chk)
 5151 {
 5152         uint8_t this_random;
 5153 
 5154         /* Huh? */
 5155         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 0)
 5156                 return (0);
 5157 
 5158         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce) == 0)
 5159                 /* no nonce, always return ECT0 */
 5160                 return (SCTP_ECT0_BIT);
 5161 
 5162         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
 5163                 /* Peer does NOT support it, so we send a ECT0 only */
 5164                 return (SCTP_ECT0_BIT);
 5165         }
 5166         if (chk == NULL)
 5167                 return (SCTP_ECT0_BIT);
 5168 
 5169         if ((stcb->asoc.hb_random_idx > 3) ||
 5170             ((stcb->asoc.hb_random_idx == 3) &&
 5171             (stcb->asoc.hb_ect_randombit > 7))) {
 5172                 uint32_t rndval;
 5173 
 5174 warp_drive_sa:
 5175                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 5176                 memcpy(stcb->asoc.hb_random_values, &rndval,
 5177                     sizeof(stcb->asoc.hb_random_values));
 5178                 this_random = stcb->asoc.hb_random_values[0];
 5179                 stcb->asoc.hb_random_idx = 0;
 5180                 stcb->asoc.hb_ect_randombit = 0;
 5181         } else {
 5182                 if (stcb->asoc.hb_ect_randombit > 7) {
 5183                         stcb->asoc.hb_ect_randombit = 0;
 5184                         stcb->asoc.hb_random_idx++;
 5185                         if (stcb->asoc.hb_random_idx > 3) {
 5186                                 goto warp_drive_sa;
 5187                         }
 5188                 }
 5189                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 5190         }
 5191         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
 5192                 if (chk != NULL)
 5193                         /* ECN Nonce stuff */
 5194                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
 5195                 stcb->asoc.hb_ect_randombit++;
 5196                 return (SCTP_ECT1_BIT);
 5197         } else {
 5198                 stcb->asoc.hb_ect_randombit++;
 5199                 return (SCTP_ECT0_BIT);
 5200         }
 5201 }
 5202 
 5203 static int
 5204 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 5205     struct sctp_tcb *stcb,      /* may be NULL */
 5206     struct sctp_nets *net,
 5207     struct sockaddr *to,
 5208     struct mbuf *m,
 5209     uint32_t auth_offset,
 5210     struct sctp_auth_chunk *auth,
 5211     uint16_t auth_keyid,
 5212     int nofragment_flag,
 5213     int ecn_ok,
 5214     struct sctp_tmit_chunk *chk,
 5215     int out_of_asoc_ok,
 5216     uint16_t port,
 5217     int so_locked,
 5218 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 5219     SCTP_UNUSED
 5220 #endif
 5221     union sctp_sockstore *over_addr
 5222 )
 5223 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 5224 {
 5225         /*
 5226          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
 5227          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
 5228          * structure: - fill in the HMAC digest of any AUTH chunk in the
 5229          * packet. - calculate and fill in the SCTP checksum. - prepend an
 5230          * IP address header. - if boundall use INADDR_ANY. - if
 5231          * boundspecific do source address selection. - set fragmentation
 5232          * option for ipV4. - On return from IP output, check/adjust mtu
 5233          * size of output interface and smallest_mtu size as well.
 5234          */
 5235         /* Will need ifdefs around this */
 5236         struct mbuf *o_pak;
 5237         struct mbuf *newm;
 5238         struct sctphdr *sctphdr;
 5239         int packet_length;
 5240         uint32_t csum;
 5241         int ret;
 5242         uint32_t vrf_id;
 5243         sctp_route_t *ro = NULL;
 5244         struct udphdr *udp = NULL;
 5245 
 5246 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5247         struct socket *so = NULL;
 5248 
 5249 #endif
 5250 
 5251         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 5252                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 5253                 sctp_m_freem(m);
 5254                 return (EFAULT);
 5255         }
 5256         if (stcb) {
 5257                 vrf_id = stcb->asoc.vrf_id;
 5258         } else {
 5259                 vrf_id = inp->def_vrf_id;
 5260         }
 5261 
 5262         /* fill in the HMAC digest for any AUTH chunk in the packet */
 5263         if ((auth != NULL) && (stcb != NULL)) {
 5264                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
 5265         }
 5266         /* Calculate the csum and fill in the length of the packet */
 5267         sctphdr = mtod(m, struct sctphdr *);
 5268         if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
 5269             (stcb) &&
 5270             (to->sa_family == AF_INET) &&
 5271             (stcb->asoc.loopback_scope)) {
 5272                 sctphdr->checksum = 0;
 5273                 /*
 5274                  * This can probably now be taken out since my audit shows
 5275                  * no more bad pktlen's coming in. But we will wait a while
 5276                  * yet.
 5277                  */
 5278                 packet_length = sctp_calculate_len(m);
 5279         } else {
 5280                 sctphdr->checksum = 0;
 5281                 csum = sctp_calculate_sum(m, &packet_length, 0);
 5282                 sctphdr->checksum = csum;
 5283         }
 5284 
 5285         if (to->sa_family == AF_INET) {
 5286                 struct ip *ip = NULL;
 5287                 sctp_route_t iproute;
 5288                 uint8_t tos_value;
 5289 
 5290                 if (port) {
 5291                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
 5292                 } else {
 5293                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
 5294                 }
 5295                 if (newm == NULL) {
 5296                         sctp_m_freem(m);
 5297                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5298                         return (ENOMEM);
 5299                 }
 5300                 if (port) {
 5301                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip) + sizeof(struct udphdr));
 5302                         SCTP_BUF_LEN(newm) = sizeof(struct ip) + sizeof(struct udphdr);
 5303                         packet_length += sizeof(struct ip) + sizeof(struct udphdr);
 5304                 } else {
 5305                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
 5306                         SCTP_BUF_LEN(newm) = sizeof(struct ip);
 5307                         packet_length += sizeof(struct ip);
 5308                 }
 5309                 SCTP_BUF_NEXT(newm) = m;
 5310                 m = newm;
 5311                 ip = mtod(m, struct ip *);
 5312                 ip->ip_v = IPVERSION;
 5313                 ip->ip_hl = (sizeof(struct ip) >> 2);
 5314                 if (net) {
 5315                         tos_value = net->tos_flowlabel & 0x000000ff;
 5316                 } else {
 5317                         tos_value = inp->ip_inp.inp.inp_ip_tos;
 5318                 }
 5319                 if ((nofragment_flag) && (port == 0)) {
 5320 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__) || defined(__Userspace__)
 5321                         ip->ip_off = IP_DF;
 5322 #else
 5323                         ip->ip_off = htons(IP_DF);
 5324 #endif
 5325                 } else
 5326                         ip->ip_off = 0;
 5327 
 5328                 /* FreeBSD has a function for ip_id's */
 5329                 ip->ip_id = ip_newid();
 5330 
 5331                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 5332                 ip->ip_len = packet_length;
 5333                 if (stcb) {
 5334                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
 5335                                 /* Enable ECN */
 5336                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
 5337                         } else {
 5338                                 /* No ECN */
 5339                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
 5340                         }
 5341                 } else {
 5342                         /* no association at all */
 5343                         ip->ip_tos = (tos_value & 0xfc);
 5344                 }
 5345                 if (port) {
 5346                         ip->ip_p = IPPROTO_UDP;
 5347                 } else {
 5348                         ip->ip_p = IPPROTO_SCTP;
 5349                 }
 5350                 ip->ip_sum = 0;
 5351                 if (net == NULL) {
 5352                         ro = &iproute;
 5353                         memset(&iproute, 0, sizeof(iproute));
 5354                         memcpy(&ro->ro_dst, to, to->sa_len);
 5355                 } else {
 5356                         ro = (sctp_route_t *) & net->ro;
 5357                 }
 5358                 /* Now the address selection part */
 5359                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 5360 
 5361                 /* call the routine to select the src address */
 5362                 if (net && out_of_asoc_ok == 0) {
 5363                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 5364                                 sctp_free_ifa(net->ro._s_addr);
 5365                                 net->ro._s_addr = NULL;
 5366                                 net->src_addr_selected = 0;
 5367                                 if (ro->ro_rt) {
 5368                                         RTFREE(ro->ro_rt);
 5369                                         ro->ro_rt = NULL;
 5370                                 }
 5371                         }
 5372                         if (net->src_addr_selected == 0) {
 5373                                 /* Cache the source address */
 5374                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 5375                                     ro, net, 0,
 5376                                     vrf_id);
 5377                                 net->src_addr_selected = 1;
 5378                         }
 5379                         if (net->ro._s_addr == NULL) {
 5380                                 /* No route to host */
 5381                                 net->src_addr_selected = 0;
 5382                                 goto no_route;
 5383                         }
 5384                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 5385                 } else {
 5386                         if (over_addr == NULL) {
 5387                                 struct sctp_ifa *_lsrc;
 5388 
 5389                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
 5390                                     net,
 5391                                     out_of_asoc_ok,
 5392                                     vrf_id);
 5393                                 if (_lsrc == NULL) {
 5394                                         goto no_route;
 5395                                 }
 5396                                 ip->ip_src = _lsrc->address.sin.sin_addr;
 5397                                 sctp_free_ifa(_lsrc);
 5398                         } else {
 5399                                 ip->ip_src = over_addr->sin.sin_addr;
 5400                                 SCTP_RTALLOC(ro, vrf_id);
 5401                         }
 5402                 }
 5403                 if (port) {
 5404                         udp = (struct udphdr *)(ip + 1);
 5405                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 5406                         udp->uh_dport = port;
 5407                         udp->uh_ulen = htons(packet_length - sizeof(struct ip));
 5408                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
 5409                 }
 5410                 /*
 5411                  * If source address selection fails and we find no route
 5412                  * then the ip_output should fail as well with a
 5413                  * NO_ROUTE_TO_HOST type error. We probably should catch
 5414                  * that somewhere and abort the association right away
 5415                  * (assuming this is an INIT being sent).
 5416                  */
 5417                 if ((ro->ro_rt == NULL)) {
 5418                         /*
 5419                          * src addr selection failed to find a route (or
 5420                          * valid source addr), so we can't get there from
 5421                          * here (yet)!
 5422                          */
 5423         no_route:
 5424                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
 5425                             "%s: dropped packet - no valid source addr\n",
 5426                             __FUNCTION__);
 5427                         if (net) {
 5428                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
 5429                                     "Destination was ");
 5430                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
 5431                                     &net->ro._l_addr.sa);
 5432                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 5433                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 5434                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
 5435                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 5436                                                     stcb,
 5437                                                     SCTP_FAILED_THRESHOLD,
 5438                                                     (void *)net,
 5439                                                     so_locked);
 5440                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 5441                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 5442                                                 /*
 5443                                                  * JRS 5/14/07 - If a
 5444                                                  * destination is
 5445                                                  * unreachable, the PF bit
 5446                                                  * is turned off.  This
 5447                                                  * allows an unambiguous use
 5448                                                  * of the PF bit for
 5449                                                  * destinations that are
 5450                                                  * reachable but potentially
 5451                                                  * failed. If the
 5452                                                  * destination is set to the
 5453                                                  * unreachable state, also
 5454                                                  * set the destination to
 5455                                                  * the PF state.
 5456                                                  */
 5457                                                 /*
 5458                                                  * Add debug message here if
 5459                                                  * destination is not in PF
 5460                                                  * state.
 5461                                                  */
 5462                                                 /*
 5463                                                  * Stop any running T3
 5464                                                  * timers here?
 5465                                                  */
 5466                                                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
 5467                                                         net->dest_state &= ~SCTP_ADDR_PF;
 5468                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
 5469                                                             net);
 5470                                                 }
 5471                                         }
 5472                                 }
 5473                                 if (stcb) {
 5474                                         if (net == stcb->asoc.primary_destination) {
 5475                                                 /* need a new primary */
 5476                                                 struct sctp_nets *alt;
 5477 
 5478                                                 alt = sctp_find_alternate_net(stcb, net, 0);
 5479                                                 if (alt != net) {
 5480                                                         if (sctp_set_primary_addr(stcb,
 5481                                                             (struct sockaddr *)NULL,
 5482                                                             alt) == 0) {
 5483                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
 5484                                                                 if (net->ro._s_addr) {
 5485                                                                         sctp_free_ifa(net->ro._s_addr);
 5486                                                                         net->ro._s_addr = NULL;
 5487                                                                 }
 5488                                                                 net->src_addr_selected = 0;
 5489                                                         }
 5490                                                 }
 5491                                         }
 5492                                 }
 5493                         }
 5494                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 5495                         sctp_m_freem(m);
 5496                         return (EHOSTUNREACH);
 5497                 }
 5498                 if (ro != &iproute) {
 5499                         memcpy(&iproute, ro, sizeof(*ro));
 5500                 }
 5501                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 5502                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
 5503                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 5504                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
 5505                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 5506                     ro->ro_rt);
 5507 
 5508                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 5509                         /* failed to prepend data, give up */
 5510                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5511                         sctp_m_freem(m);
 5512                         return (ENOMEM);
 5513                 }
 5514 #ifdef  SCTP_PACKET_LOGGING
 5515                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 5516                         sctp_packet_log(m, packet_length);
 5517 #endif
 5518                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 5519                 if (port) {
 5520                         SCTP_ENABLE_UDP_CSUM(o_pak);
 5521                 }
 5522                 /* send it out.  table id is taken from stcb */
 5523 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5524                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 5525                         so = SCTP_INP_SO(inp);
 5526                         SCTP_SOCKET_UNLOCK(so, 0);
 5527                 }
 5528 #endif
 5529                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
 5530 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5531                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 5532                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5533                         SCTP_TCB_UNLOCK(stcb);
 5534                         SCTP_SOCKET_LOCK(so, 0);
 5535                         SCTP_TCB_LOCK(stcb);
 5536                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5537                 }
 5538 #endif
 5539                 SCTP_STAT_INCR(sctps_sendpackets);
 5540                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 5541                 if (ret)
 5542                         SCTP_STAT_INCR(sctps_senderrors);
 5543 
 5544                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 5545                 if (net == NULL) {
 5546                         /* free tempy routes */
 5547                         if (ro->ro_rt) {
 5548                                 RTFREE(ro->ro_rt);
 5549                                 ro->ro_rt = NULL;
 5550                         }
 5551                 } else {
 5552                         /* PMTU check versus smallest asoc MTU goes here */
 5553                         if ((ro->ro_rt != NULL) &&
 5554                             (net->ro._s_addr)) {
 5555                                 uint32_t mtu;
 5556 
 5557                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 5558                                 if (net->port) {
 5559                                         mtu -= sizeof(struct udphdr);
 5560                                 }
 5561                                 if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
 5562 #ifdef SCTP_PRINT_FOR_B_AND_M
 5563                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n", mtu);
 5564 #endif
 5565                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 5566                                         net->mtu = mtu;
 5567                                 }
 5568                         } else if (ro->ro_rt == NULL) {
 5569                                 /* route was freed */
 5570                                 if (net->ro._s_addr &&
 5571                                     net->src_addr_selected) {
 5572                                         sctp_free_ifa(net->ro._s_addr);
 5573                                         net->ro._s_addr = NULL;
 5574                                 }
 5575                                 net->src_addr_selected = 0;
 5576                         }
 5577                 }
 5578                 return (ret);
 5579         }
 5580 #ifdef INET6
 5581         else if (to->sa_family == AF_INET6) {
 5582                 uint32_t flowlabel;
 5583                 struct ip6_hdr *ip6h;
 5584                 struct route_in6 ip6route;
 5585                 struct ifnet *ifp;
 5586                 u_char flowTop;
 5587                 uint16_t flowBottom;
 5588                 u_char tosBottom, tosTop;
 5589                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 5590                 int prev_scope = 0;
 5591                 struct sockaddr_in6 lsa6_storage;
 5592                 int error;
 5593                 u_short prev_port = 0;
 5594 
 5595                 if (net != NULL) {
 5596                         flowlabel = net->tos_flowlabel;
 5597                 } else {
 5598                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
 5599                 }
 5600 
 5601                 if (port) {
 5602                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
 5603                 } else {
 5604                         newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
 5605                 }
 5606                 if (newm == NULL) {
 5607                         sctp_m_freem(m);
 5608                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5609                         return (ENOMEM);
 5610                 }
 5611                 if (port) {
 5612                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
 5613                         SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr) + sizeof(struct udphdr);
 5614                         packet_length += sizeof(struct ip6_hdr) + sizeof(struct udphdr);
 5615                 } else {
 5616                         SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
 5617                         SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
 5618                         packet_length += sizeof(struct ip6_hdr);
 5619                 }
 5620                 SCTP_BUF_NEXT(newm) = m;
 5621                 m = newm;
 5622 
 5623                 ip6h = mtod(m, struct ip6_hdr *);
 5624                 /*
 5625                  * We assume here that inp_flow is in host byte order within
 5626                  * the TCB!
 5627                  */
 5628                 flowBottom = flowlabel & 0x0000ffff;
 5629                 flowTop = ((flowlabel & 0x000f0000) >> 16);
 5630                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
 5631                 /* protect *sin6 from overwrite */
 5632                 sin6 = (struct sockaddr_in6 *)to;
 5633                 tmp = *sin6;
 5634                 sin6 = &tmp;
 5635 
 5636                 /* KAME hack: embed scopeid */
 5637                 if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
 5638                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 5639                         return (EINVAL);
 5640                 }
 5641                 if (net == NULL) {
 5642                         memset(&ip6route, 0, sizeof(ip6route));
 5643                         ro = (sctp_route_t *) & ip6route;
 5644                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 5645                 } else {
 5646                         ro = (sctp_route_t *) & net->ro;
 5647                 }
 5648                 if (stcb != NULL) {
 5649                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
 5650                                 /* Enable ECN */
 5651                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
 5652                         } else {
 5653                                 /* No ECN */
 5654                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
 5655                         }
 5656                 } else {
 5657                         /* we could get no asoc if it is a O-O-T-B packet */
 5658                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
 5659                 }
 5660                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
 5661                 if (port) {
 5662                         ip6h->ip6_nxt = IPPROTO_UDP;
 5663                 } else {
 5664                         ip6h->ip6_nxt = IPPROTO_SCTP;
 5665                 }
 5666                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
 5667                 ip6h->ip6_dst = sin6->sin6_addr;
 5668 
 5669                 /*
 5670                  * Add SRC address selection here: we can only reuse to a
 5671                  * limited degree the kame src-addr-sel, since we can try
 5672                  * their selection but it may not be bound.
 5673                  */
 5674                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
 5675                 lsa6_tmp.sin6_family = AF_INET6;
 5676                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 5677                 lsa6 = &lsa6_tmp;
 5678                 if (net && out_of_asoc_ok == 0) {
 5679                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 5680                                 sctp_free_ifa(net->ro._s_addr);
 5681                                 net->ro._s_addr = NULL;
 5682                                 net->src_addr_selected = 0;
 5683                                 if (ro->ro_rt) {
 5684                                         RTFREE(ro->ro_rt);
 5685                                         ro->ro_rt = NULL;
 5686                                 }
 5687                         }
 5688                         if (net->src_addr_selected == 0) {
 5689                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 5690                                 /* KAME hack: embed scopeid */
 5691                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
 5692                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 5693                                         return (EINVAL);
 5694                                 }
 5695                                 /* Cache the source address */
 5696                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5697                                     stcb,
 5698                                     ro,
 5699                                     net,
 5700                                     0,
 5701                                     vrf_id);
 5702                                 (void)sa6_recoverscope(sin6);
 5703                                 net->src_addr_selected = 1;
 5704                         }
 5705                         if (net->ro._s_addr == NULL) {
 5706                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 5707                                 net->src_addr_selected = 0;
 5708                                 goto no_route;
 5709                         }
 5710                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 5711                 } else {
 5712                         sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 5713                         /* KAME hack: embed scopeid */
 5714                         if (sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone)) != 0) {
 5715                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 5716                                 return (EINVAL);
 5717                         }
 5718                         if (over_addr == NULL) {
 5719                                 struct sctp_ifa *_lsrc;
 5720 
 5721                                 _lsrc = sctp_source_address_selection(inp, stcb, ro,
 5722                                     net,
 5723                                     out_of_asoc_ok,
 5724                                     vrf_id);
 5725                                 if (_lsrc == NULL) {
 5726                                         goto no_route;
 5727                                 }
 5728                                 lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 5729                                 sctp_free_ifa(_lsrc);
 5730                         } else {
 5731                                 lsa6->sin6_addr = over_addr->sin6.sin6_addr;
 5732                                 SCTP_RTALLOC(ro, vrf_id);
 5733                         }
 5734                         (void)sa6_recoverscope(sin6);
 5735                 }
 5736                 lsa6->sin6_port = inp->sctp_lport;
 5737 
 5738                 if (ro->ro_rt == NULL) {
 5739                         /*
 5740                          * src addr selection failed to find a route (or
 5741                          * valid source addr), so we can't get there from
 5742                          * here!
 5743                          */
 5744                         goto no_route;
 5745                 }
 5746                 /*
 5747                  * XXX: sa6 may not have a valid sin6_scope_id in the
 5748                  * non-SCOPEDROUTING case.
 5749                  */
 5750                 bzero(&lsa6_storage, sizeof(lsa6_storage));
 5751                 lsa6_storage.sin6_family = AF_INET6;
 5752                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
 5753                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
 5754                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 5755                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 5756                         sctp_m_freem(m);
 5757                         return (error);
 5758                 }
 5759                 /* XXX */
 5760                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
 5761                 lsa6_storage.sin6_port = inp->sctp_lport;
 5762                 lsa6 = &lsa6_storage;
 5763                 ip6h->ip6_src = lsa6->sin6_addr;
 5764 
 5765                 if (port) {
 5766                         udp = (struct udphdr *)(ip6h + 1);
 5767                         udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 5768                         udp->uh_dport = port;
 5769                         udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
 5770                         udp->uh_sum = 0;
 5771                 }
 5772                 /*
 5773                  * We set the hop limit now since there is a good chance
 5774                  * that our ro pointer is now filled
 5775                  */
 5776                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 5777                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 5778 
 5779 #ifdef SCTP_DEBUG
 5780                 /* Copy to be sure something bad is not happening */
 5781                 sin6->sin6_addr = ip6h->ip6_dst;
 5782                 lsa6->sin6_addr = ip6h->ip6_src;
 5783 #endif
 5784 
 5785                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 5786                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 5787                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 5788                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 5789                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 5790                 if (net) {
 5791                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 5792                         /* preserve the port and scope for link local send */
 5793                         prev_scope = sin6->sin6_scope_id;
 5794                         prev_port = sin6->sin6_port;
 5795                 }
 5796                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 5797                         /* failed to prepend data, give up */
 5798                         sctp_m_freem(m);
 5799                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5800                         return (ENOMEM);
 5801                 }
 5802 #ifdef  SCTP_PACKET_LOGGING
 5803                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 5804                         sctp_packet_log(m, packet_length);
 5805 #endif
 5806                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 5807                 if (port) {
 5808                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 5809                                 udp->uh_sum = 0xffff;
 5810                         }
 5811                 }
 5812                 /* send it out. table id is taken from stcb */
 5813 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5814                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 5815                         so = SCTP_INP_SO(inp);
 5816                         SCTP_SOCKET_UNLOCK(so, 0);
 5817                 }
 5818 #endif
 5819                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
 5820 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 5821                 if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 5822                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5823                         SCTP_TCB_UNLOCK(stcb);
 5824                         SCTP_SOCKET_LOCK(so, 0);
 5825                         SCTP_TCB_LOCK(stcb);
 5826                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 5827                 }
 5828 #endif
 5829                 if (net) {
 5830                         /* for link local this must be done */
 5831                         sin6->sin6_scope_id = prev_scope;
 5832                         sin6->sin6_port = prev_port;
 5833                 }
 5834                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 5835                 SCTP_STAT_INCR(sctps_sendpackets);
 5836                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 5837                 if (ret) {
 5838                         SCTP_STAT_INCR(sctps_senderrors);
 5839                 }
 5840                 if (net == NULL) {
 5841                         /* Now if we had a temp route free it */
 5842                         if (ro->ro_rt) {
 5843                                 RTFREE(ro->ro_rt);
 5844                         }
 5845                 } else {
 5846                         /* PMTU check versus smallest asoc MTU goes here */
 5847                         if (ro->ro_rt == NULL) {
 5848                                 /* Route was freed */
 5849                                 if (net->ro._s_addr &&
 5850                                     net->src_addr_selected) {
 5851                                         sctp_free_ifa(net->ro._s_addr);
 5852                                         net->ro._s_addr = NULL;
 5853                                 }
 5854                                 net->src_addr_selected = 0;
 5855                         }
 5856                         if ((ro->ro_rt != NULL) &&
 5857                             (net->ro._s_addr)) {
 5858                                 uint32_t mtu;
 5859 
 5860                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 5861                                 if (mtu &&
 5862                                     (stcb->asoc.smallest_mtu > mtu)) {
 5863 #ifdef SCTP_PRINT_FOR_B_AND_M
 5864                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
 5865                                             mtu);
 5866 #endif
 5867                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 5868                                         net->mtu = mtu;
 5869                                         if (net->port) {
 5870                                                 net->mtu -= sizeof(struct udphdr);
 5871                                         }
 5872                                 }
 5873                         } else if (ifp) {
 5874                                 if (ND_IFINFO(ifp)->linkmtu &&
 5875                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 5876 #ifdef SCTP_PRINT_FOR_B_AND_M
 5877                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
 5878                                             ND_IFINFO(ifp)->linkmtu);
 5879 #endif
 5880                                         sctp_mtu_size_reset(inp,
 5881                                             &stcb->asoc,
 5882                                             ND_IFINFO(ifp)->linkmtu);
 5883                                 }
 5884                         }
 5885                 }
 5886                 return (ret);
 5887         }
 5888 #endif
 5889         else {
 5890                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 5891                     ((struct sockaddr *)to)->sa_family);
 5892                 sctp_m_freem(m);
 5893                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 5894                 return (EFAULT);
 5895         }
 5896 }
 5897 
 5898 
 5899 void
 5900 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
 5901 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 5902     SCTP_UNUSED
 5903 #endif
 5904 )
 5905 {
 5906         struct mbuf *m, *m_at, *mp_last;
 5907         struct sctp_nets *net;
 5908         struct sctp_init_msg *initm;
 5909         struct sctp_supported_addr_param *sup_addr;
 5910         struct sctp_ecn_supported_param *ecn;
 5911         struct sctp_prsctp_supported_param *prsctp;
 5912         struct sctp_ecn_nonce_supported_param *ecn_nonce;
 5913         struct sctp_supported_chunk_types_param *pr_supported;
 5914         int cnt_inits_to = 0;
 5915         int padval, ret;
 5916         int num_ext;
 5917         int p_len;
 5918 
 5919         /* INIT's always go to the primary (and usually ONLY address) */
 5920         mp_last = NULL;
 5921         net = stcb->asoc.primary_destination;
 5922         if (net == NULL) {
 5923                 net = TAILQ_FIRST(&stcb->asoc.nets);
 5924                 if (net == NULL) {
 5925                         /* TSNH */
 5926                         return;
 5927                 }
 5928                 /* we confirm any address we send an INIT to */
 5929                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 5930                 (void)sctp_set_primary_addr(stcb, NULL, net);
 5931         } else {
 5932                 /* we confirm any address we send an INIT to */
 5933                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 5934         }
 5935         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 5936 #ifdef INET6
 5937         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
 5938                 /*
 5939                  * special hook, if we are sending to link local it will not
 5940                  * show up in our private address count.
 5941                  */
 5942                 struct sockaddr_in6 *sin6l;
 5943 
 5944                 sin6l = &net->ro._l_addr.sin6;
 5945                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
 5946                         cnt_inits_to = 1;
 5947         }
 5948 #endif
 5949         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 5950                 /* This case should not happen */
 5951                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 5952                 return;
 5953         }
 5954         /* start the INIT timer */
 5955         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 5956 
 5957         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
 5958         if (m == NULL) {
 5959                 /* No memory, INIT timer will re-attempt. */
 5960                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 5961                 return;
 5962         }
 5963         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
 5964         /*
 5965          * assume peer supports asconf in order to be able to queue local
 5966          * address changes while an INIT is in flight and before the assoc
 5967          * is established.
 5968          */
 5969         stcb->asoc.peer_supports_asconf = 1;
 5970         /* Now lets put the SCTP header in place */
 5971         initm = mtod(m, struct sctp_init_msg *);
 5972         initm->sh.src_port = inp->sctp_lport;
 5973         initm->sh.dest_port = stcb->rport;
 5974         initm->sh.v_tag = 0;
 5975         initm->sh.checksum = 0; /* calculate later */
 5976         /* now the chunk header */
 5977         initm->msg.ch.chunk_type = SCTP_INITIATION;
 5978         initm->msg.ch.chunk_flags = 0;
 5979         /* fill in later from mbuf we build */
 5980         initm->msg.ch.chunk_length = 0;
 5981         /* place in my tag */
 5982         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
 5983         /* set up some of the credits. */
 5984         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
 5985             SCTP_MINIMAL_RWND));
 5986 
 5987         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 5988         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 5989         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 5990         /* now the address restriction */
 5991         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
 5992             sizeof(*initm));
 5993         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 5994 #ifdef INET6
 5995         /* we support 2 types: IPv6/IPv4 */
 5996         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint16_t));
 5997         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
 5998         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
 5999 #else
 6000         /* we support 1 type: IPv4 */
 6001         sup_addr->ph.param_length = htons(sizeof(*sup_addr) + sizeof(uint8_t));
 6002         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
 6003         sup_addr->addr_type[1] = htons(0);      /* this is the padding */
 6004 #endif
 6005         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
 6006 
 6007         if (inp->sctp_ep.adaptation_layer_indicator) {
 6008                 struct sctp_adaptation_layer_indication *ali;
 6009 
 6010                 ali = (struct sctp_adaptation_layer_indication *)(
 6011                     (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
 6012                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 6013                 ali->ph.param_length = htons(sizeof(*ali));
 6014                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
 6015                 SCTP_BUF_LEN(m) += sizeof(*ali);
 6016                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
 6017                     sizeof(*ali));
 6018         } else {
 6019                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
 6020                     sizeof(*sup_addr) + sizeof(uint16_t));
 6021         }
 6022 
 6023         /* now any cookie time extensions */
 6024         if (stcb->asoc.cookie_preserve_req) {
 6025                 struct sctp_cookie_perserve_param *cookie_preserve;
 6026 
 6027                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
 6028                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 6029                 cookie_preserve->ph.param_length = htons(
 6030                     sizeof(*cookie_preserve));
 6031                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 6032                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
 6033                 ecn = (struct sctp_ecn_supported_param *)(
 6034                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
 6035                 stcb->asoc.cookie_preserve_req = 0;
 6036         }
 6037         /* ECN parameter */
 6038         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
 6039                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
 6040                 ecn->ph.param_length = htons(sizeof(*ecn));
 6041                 SCTP_BUF_LEN(m) += sizeof(*ecn);
 6042                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
 6043                     sizeof(*ecn));
 6044         } else {
 6045                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
 6046         }
 6047         /* And now tell the peer we do pr-sctp */
 6048         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
 6049         prsctp->ph.param_length = htons(sizeof(*prsctp));
 6050         SCTP_BUF_LEN(m) += sizeof(*prsctp);
 6051 
 6052         /* And now tell the peer we do all the extensions */
 6053         pr_supported = (struct sctp_supported_chunk_types_param *)
 6054             ((caddr_t)prsctp + sizeof(*prsctp));
 6055         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 6056         num_ext = 0;
 6057         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 6058         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 6059         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 6060         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 6061         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 6062         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
 6063                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 6064         /*
 6065          * EY  if the initiator supports nr_sacks, need to report that to
 6066          * responder in INIT chunk
 6067          */
 6068         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
 6069                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 6070         p_len = sizeof(*pr_supported) + num_ext;
 6071         pr_supported->ph.param_length = htons(p_len);
 6072         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
 6073         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 6074 
 6075         /* ECN nonce: And now tell the peer we support ECN nonce */
 6076         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
 6077                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
 6078                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
 6079                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
 6080                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
 6081                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
 6082         }
 6083         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
 6084                 /* Add NAT friendly parameter */
 6085                 struct sctp_paramhdr *ph;
 6086 
 6087                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 6088                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 6089                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
 6090                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
 6091         }
 6092         /* add authentication parameters */
 6093         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
 6094                 struct sctp_auth_random *randp;
 6095                 struct sctp_auth_hmac_algo *hmacs;
 6096                 struct sctp_auth_chunk_list *chunks;
 6097 
 6098                 /* attach RANDOM parameter, if available */
 6099                 if (stcb->asoc.authinfo.random != NULL) {
 6100                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 6101                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
 6102 #ifdef SCTP_AUTH_DRAFT_04
 6103                         randp->ph.param_type = htons(SCTP_RANDOM);
 6104                         randp->ph.param_length = htons(p_len);
 6105                         bcopy(stcb->asoc.authinfo.random->key,
 6106                             randp->random_data,
 6107                             stcb->asoc.authinfo.random_len);
 6108 #else
 6109                         /* random key already contains the header */
 6110                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
 6111 #endif
 6112                         /* zero out any padding required */
 6113                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
 6114                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 6115                 }
 6116                 /* add HMAC_ALGO parameter */
 6117                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 6118                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
 6119                     (uint8_t *) hmacs->hmac_ids);
 6120                 if (p_len > 0) {
 6121                         p_len += sizeof(*hmacs);
 6122                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 6123                         hmacs->ph.param_length = htons(p_len);
 6124                         /* zero out any padding required */
 6125                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
 6126                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 6127                 }
 6128                 /* add CHUNKS parameter */
 6129                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 6130                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
 6131                     chunks->chunk_types);
 6132                 if (p_len > 0) {
 6133                         p_len += sizeof(*chunks);
 6134                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 6135                         chunks->ph.param_length = htons(p_len);
 6136                         /* zero out any padding required */
 6137                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
 6138                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 6139                 }
 6140         }
 6141         m_at = m;
 6142         /* now the addresses */
 6143         {
 6144                 struct sctp_scoping scp;
 6145 
 6146                 /*
 6147                  * To optimize this we could put the scoping stuff into a
 6148                  * structure and remove the individual uint8's from the
 6149                  * assoc structure. Then we could just sifa in the address
 6150                  * within the stcb.. but for now this is a quick hack to get
 6151                  * the address stuff teased apart.
 6152                  */
 6153                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
 6154                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
 6155                 scp.loopback_scope = stcb->asoc.loopback_scope;
 6156                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
 6157                 scp.local_scope = stcb->asoc.local_scope;
 6158                 scp.site_scope = stcb->asoc.site_scope;
 6159 
 6160                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
 6161         }
 6162 
 6163         /* calulate the size and update pkt header and chunk header */
 6164         p_len = 0;
 6165         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 6166                 if (SCTP_BUF_NEXT(m_at) == NULL)
 6167                         mp_last = m_at;
 6168                 p_len += SCTP_BUF_LEN(m_at);
 6169         }
 6170         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
 6171         /*
 6172          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 6173          * here since the timer will drive a retranmission.
 6174          */
 6175 
 6176         /* I don't expect this to execute but we will be safe here */
 6177         padval = p_len % 4;
 6178         if ((padval) && (mp_last)) {
 6179                 /*
 6180                  * The compiler worries that mp_last may not be set even
 6181                  * though I think it is impossible :-> however we add
 6182                  * mp_last here just in case.
 6183                  */
 6184                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
 6185                 if (ret) {
 6186                         /* Houston we have a problem, no space */
 6187                         sctp_m_freem(m);
 6188                         return;
 6189                 }
 6190                 p_len += padval;
 6191         }
 6192         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 6193         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
 6194             (struct sockaddr *)&net->ro._l_addr,
 6195             m, 0, NULL, 0, 0, 0, NULL, 0, net->port, so_locked, NULL);
 6196         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
 6197         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 6198         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 6199         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 6200 }
 6201 
 6202 struct mbuf *
 6203 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 6204     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
 6205 {
 6206         /*
 6207          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 6208          * being equal to the beginning of the params i.e. (iphlen +
 6209          * sizeof(struct sctp_init_msg) parse through the parameters to the
 6210          * end of the mbuf verifying that all parameters are known.
 6211          * 
 6212          * For unknown parameters build and return a mbuf with
 6213          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 6214          * processing this chunk stop, and set *abort_processing to 1.
 6215          * 
 6216          * By having param_offset be pre-set to where parameters begin it is
 6217          * hoped that this routine may be reused in the future by new
 6218          * features.
 6219          */
 6220         struct sctp_paramhdr *phdr, params;
 6221 
 6222         struct mbuf *mat, *op_err;
 6223         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
 6224         int at, limit, pad_needed;
 6225         uint16_t ptype, plen, padded_size;
 6226         int err_at;
 6227 
 6228         *abort_processing = 0;
 6229         mat = in_initpkt;
 6230         err_at = 0;
 6231         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 6232         at = param_offset;
 6233         op_err = NULL;
 6234         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 6235         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 6236         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 6237                 ptype = ntohs(phdr->param_type);
 6238                 plen = ntohs(phdr->param_length);
 6239                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 6240                         /* wacked parameter */
 6241                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 6242                         goto invalid_size;
 6243                 }
 6244                 limit -= SCTP_SIZE32(plen);
 6245                 /*-
 6246                  * All parameters for all chunks that we know/understand are
 6247                  * listed here. We process them other places and make
 6248                  * appropriate stop actions per the upper bits. However this
 6249                  * is the generic routine processor's can call to get back
 6250                  * an operr.. to either incorporate (init-ack) or send.
 6251                  */
 6252                 padded_size = SCTP_SIZE32(plen);
 6253                 switch (ptype) {
 6254                         /* Param's with variable size */
 6255                 case SCTP_HEARTBEAT_INFO:
 6256                 case SCTP_STATE_COOKIE:
 6257                 case SCTP_UNRECOG_PARAM:
 6258                 case SCTP_ERROR_CAUSE_IND:
 6259                         /* ok skip fwd */
 6260                         at += padded_size;
 6261                         break;
 6262                         /* Param's with variable size within a range */
 6263                 case SCTP_CHUNK_LIST:
 6264                 case SCTP_SUPPORTED_CHUNK_EXT:
 6265                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 6266                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 6267                                 goto invalid_size;
 6268                         }
 6269                         at += padded_size;
 6270                         break;
 6271                 case SCTP_SUPPORTED_ADDRTYPE:
 6272                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 6273                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 6274                                 goto invalid_size;
 6275                         }
 6276                         at += padded_size;
 6277                         break;
 6278                 case SCTP_RANDOM:
 6279                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 6280                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 6281                                 goto invalid_size;
 6282                         }
 6283                         at += padded_size;
 6284                         break;
 6285                 case SCTP_SET_PRIM_ADDR:
 6286                 case SCTP_DEL_IP_ADDRESS:
 6287                 case SCTP_ADD_IP_ADDRESS:
 6288                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 6289                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 6290                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 6291                                 goto invalid_size;
 6292                         }
 6293                         at += padded_size;
 6294                         break;
 6295                         /* Param's with a fixed size */
 6296                 case SCTP_IPV4_ADDRESS:
 6297                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 6298                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 6299                                 goto invalid_size;
 6300                         }
 6301                         at += padded_size;
 6302                         break;
 6303                 case SCTP_IPV6_ADDRESS:
 6304                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 6305                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 6306                                 goto invalid_size;
 6307                         }
 6308                         at += padded_size;
 6309                         break;
 6310                 case SCTP_COOKIE_PRESERVE:
 6311                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 6312                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 6313                                 goto invalid_size;
 6314                         }
 6315                         at += padded_size;
 6316                         break;
 6317                 case SCTP_HAS_NAT_SUPPORT:
 6318                         *nat_friendly = 1;
 6319                         /* fall through */
 6320                 case SCTP_ECN_NONCE_SUPPORTED:
 6321                 case SCTP_PRSCTP_SUPPORTED:
 6322 
 6323                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 6324                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp/nat support %d\n", plen);
 6325                                 goto invalid_size;
 6326                         }
 6327                         at += padded_size;
 6328                         break;
 6329                 case SCTP_ECN_CAPABLE:
 6330                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
 6331                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 6332                                 goto invalid_size;
 6333                         }
 6334                         at += padded_size;
 6335                         break;
 6336                 case SCTP_ULP_ADAPTATION:
 6337                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 6338                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 6339                                 goto invalid_size;
 6340                         }
 6341                         at += padded_size;
 6342                         break;
 6343                 case SCTP_SUCCESS_REPORT:
 6344                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 6345                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 6346                                 goto invalid_size;
 6347                         }
 6348                         at += padded_size;
 6349                         break;
 6350                 case SCTP_HOSTNAME_ADDRESS:
 6351                         {
 6352                                 /* We can NOT handle HOST NAME addresses!! */
 6353                                 int l_len;
 6354 
 6355                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 6356                                 *abort_processing = 1;
 6357                                 if (op_err == NULL) {
 6358                                         /* Ok need to try to get a mbuf */
 6359 #ifdef INET6
 6360                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6361 #else
 6362                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6363 #endif
 6364                                         l_len += plen;
 6365                                         l_len += sizeof(struct sctp_paramhdr);
 6366                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 6367                                         if (op_err) {
 6368                                                 SCTP_BUF_LEN(op_err) = 0;
 6369                                                 /*
 6370                                                  * pre-reserve space for ip
 6371                                                  * and sctp header  and
 6372                                                  * chunk hdr
 6373                                                  */
 6374 #ifdef INET6
 6375                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 6376 #else
 6377                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 6378 #endif
 6379                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 6380                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 6381                                         }
 6382                                 }
 6383                                 if (op_err) {
 6384                                         /* If we have space */
 6385                                         struct sctp_paramhdr s;
 6386 
 6387                                         if (err_at % 4) {
 6388                                                 uint32_t cpthis = 0;
 6389 
 6390                                                 pad_needed = 4 - (err_at % 4);
 6391                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 6392                                                 err_at += pad_needed;
 6393                                         }
 6394                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 6395                                         s.param_length = htons(sizeof(s) + plen);
 6396                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 6397                                         err_at += sizeof(s);
 6398                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 6399                                         if (phdr == NULL) {
 6400                                                 sctp_m_freem(op_err);
 6401                                                 /*
 6402                                                  * we are out of memory but
 6403                                                  * we still need to have a
 6404                                                  * look at what to do (the
 6405                                                  * system is in trouble
 6406                                                  * though).
 6407                                                  */
 6408                                                 return (NULL);
 6409                                         }
 6410                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 6411                                         err_at += plen;
 6412                                 }
 6413                                 return (op_err);
 6414                                 break;
 6415                         }
 6416                 default:
 6417                         /*
 6418                          * we do not recognize the parameter figure out what
 6419                          * we do.
 6420                          */
 6421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 6422                         if ((ptype & 0x4000) == 0x4000) {
 6423                                 /* Report bit is set?? */
 6424                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 6425                                 if (op_err == NULL) {
 6426                                         int l_len;
 6427 
 6428                                         /* Ok need to try to get an mbuf */
 6429 #ifdef INET6
 6430                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6431 #else
 6432                                         l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6433 #endif
 6434                                         l_len += plen;
 6435                                         l_len += sizeof(struct sctp_paramhdr);
 6436                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 6437                                         if (op_err) {
 6438                                                 SCTP_BUF_LEN(op_err) = 0;
 6439 #ifdef INET6
 6440                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 6441 #else
 6442                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 6443 #endif
 6444                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 6445                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 6446                                         }
 6447                                 }
 6448                                 if (op_err) {
 6449                                         /* If we have space */
 6450                                         struct sctp_paramhdr s;
 6451 
 6452                                         if (err_at % 4) {
 6453                                                 uint32_t cpthis = 0;
 6454 
 6455                                                 pad_needed = 4 - (err_at % 4);
 6456                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 6457                                                 err_at += pad_needed;
 6458                                         }
 6459                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
 6460                                         s.param_length = htons(sizeof(s) + plen);
 6461                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 6462                                         err_at += sizeof(s);
 6463                                         if (plen > sizeof(tempbuf)) {
 6464                                                 plen = sizeof(tempbuf);
 6465                                         }
 6466                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 6467                                         if (phdr == NULL) {
 6468                                                 sctp_m_freem(op_err);
 6469                                                 /*
 6470                                                  * we are out of memory but
 6471                                                  * we still need to have a
 6472                                                  * look at what to do (the
 6473                                                  * system is in trouble
 6474                                                  * though).
 6475                                                  */
 6476                                                 op_err = NULL;
 6477                                                 goto more_processing;
 6478                                         }
 6479                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 6480                                         err_at += plen;
 6481                                 }
 6482                         }
 6483         more_processing:
 6484                         if ((ptype & 0x8000) == 0x0000) {
 6485                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 6486                                 return (op_err);
 6487                         } else {
 6488                                 /* skip this chunk and continue processing */
 6489                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 6490                                 at += SCTP_SIZE32(plen);
 6491                         }
 6492                         break;
 6493 
 6494                 }
 6495                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 6496         }
 6497         return (op_err);
 6498 invalid_size:
 6499         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 6500         *abort_processing = 1;
 6501         if ((op_err == NULL) && phdr) {
 6502                 int l_len;
 6503 
 6504 #ifdef INET6
 6505                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6506 #else
 6507                 l_len = sizeof(struct ip) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 6508 #endif
 6509                 l_len += (2 * sizeof(struct sctp_paramhdr));
 6510                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 6511                 if (op_err) {
 6512                         SCTP_BUF_LEN(op_err) = 0;
 6513 #ifdef INET6
 6514                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 6515 #else
 6516                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 6517 #endif
 6518                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 6519                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 6520                 }
 6521         }
 6522         if ((op_err) && phdr) {
 6523                 struct sctp_paramhdr s;
 6524 
 6525                 if (err_at % 4) {
 6526                         uint32_t cpthis = 0;
 6527 
 6528                         pad_needed = 4 - (err_at % 4);
 6529                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 6530                         err_at += pad_needed;
 6531                 }
 6532                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 6533                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
 6534                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 6535                 err_at += sizeof(s);
 6536                 /* Only copy back the p-hdr that caused the issue */
 6537                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
 6538         }
 6539         return (op_err);
 6540 }
 6541 
 6542 static int
 6543 sctp_are_there_new_addresses(struct sctp_association *asoc,
 6544     struct mbuf *in_initpkt, int iphlen, int offset)
 6545 {
 6546         /*
 6547          * Given a INIT packet, look through the packet to verify that there
 6548          * are NO new addresses. As we go through the parameters add reports
 6549          * of any un-understood parameters that require an error.  Also we
 6550          * must return (1) to drop the packet if we see a un-understood
 6551          * parameter that tells us to drop the chunk.
 6552          */
 6553         struct sockaddr_in sin4, *sa4;
 6554 
 6555 #ifdef INET6
 6556         struct sockaddr_in6 sin6, *sa6;
 6557 
 6558 #endif
 6559         struct sockaddr *sa_touse;
 6560         struct sockaddr *sa;
 6561         struct sctp_paramhdr *phdr, params;
 6562         struct ip *iph;
 6563 
 6564 #ifdef INET6
 6565         struct ip6_hdr *ip6h;
 6566 
 6567 #endif
 6568         struct mbuf *mat;
 6569         uint16_t ptype, plen;
 6570         int err_at;
 6571         uint8_t fnd;
 6572         struct sctp_nets *net;
 6573 
 6574         memset(&sin4, 0, sizeof(sin4));
 6575 #ifdef INET6
 6576         memset(&sin6, 0, sizeof(sin6));
 6577 #endif
 6578         sin4.sin_family = AF_INET;
 6579         sin4.sin_len = sizeof(sin4);
 6580 #ifdef INET6
 6581         sin6.sin6_family = AF_INET6;
 6582         sin6.sin6_len = sizeof(sin6);
 6583 #endif
 6584         sa_touse = NULL;
 6585         /* First what about the src address of the pkt ? */
 6586         iph = mtod(in_initpkt, struct ip *);
 6587         switch (iph->ip_v) {
 6588         case IPVERSION:
 6589                 /* source addr is IPv4 */
 6590                 sin4.sin_addr = iph->ip_src;
 6591                 sa_touse = (struct sockaddr *)&sin4;
 6592                 break;
 6593 #ifdef INET6
 6594         case IPV6_VERSION >> 4:
 6595                 /* source addr is IPv6 */
 6596                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
 6597                 sin6.sin6_addr = ip6h->ip6_src;
 6598                 sa_touse = (struct sockaddr *)&sin6;
 6599                 break;
 6600 #endif
 6601         default:
 6602                 return (1);
 6603         }
 6604 
 6605         fnd = 0;
 6606         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 6607                 sa = (struct sockaddr *)&net->ro._l_addr;
 6608                 if (sa->sa_family == sa_touse->sa_family) {
 6609                         if (sa->sa_family == AF_INET) {
 6610                                 sa4 = (struct sockaddr_in *)sa;
 6611                                 if (sa4->sin_addr.s_addr ==
 6612                                     sin4.sin_addr.s_addr) {
 6613                                         fnd = 1;
 6614                                         break;
 6615                                 }
 6616                         }
 6617 #ifdef INET6
 6618                         if (sa->sa_family == AF_INET6) {
 6619                                 sa6 = (struct sockaddr_in6 *)sa;
 6620                                 if (SCTP6_ARE_ADDR_EQUAL(sa6,
 6621                                     &sin6)) {
 6622                                         fnd = 1;
 6623                                         break;
 6624                                 }
 6625                         }
 6626 #endif
 6627                 }
 6628         }
 6629         if (fnd == 0) {
 6630                 /* New address added! no need to look futher. */
 6631                 return (1);
 6632         }
 6633         /* Ok so far lets munge through the rest of the packet */
 6634         mat = in_initpkt;
 6635         err_at = 0;
 6636         sa_touse = NULL;
 6637         offset += sizeof(struct sctp_init_chunk);
 6638         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
 6639         while (phdr) {
 6640                 ptype = ntohs(phdr->param_type);
 6641                 plen = ntohs(phdr->param_length);
 6642                 if (ptype == SCTP_IPV4_ADDRESS) {
 6643                         struct sctp_ipv4addr_param *p4, p4_buf;
 6644 
 6645                         phdr = sctp_get_next_param(mat, offset,
 6646                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 6647                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
 6648                             phdr == NULL) {
 6649                                 return (1);
 6650                         }
 6651                         p4 = (struct sctp_ipv4addr_param *)phdr;
 6652                         sin4.sin_addr.s_addr = p4->addr;
 6653                         sa_touse = (struct sockaddr *)&sin4;
 6654                 } else if (ptype == SCTP_IPV6_ADDRESS) {
 6655                         struct sctp_ipv6addr_param *p6, p6_buf;
 6656 
 6657                         phdr = sctp_get_next_param(mat, offset,
 6658                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 6659                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
 6660                             phdr == NULL) {
 6661                                 return (1);
 6662                         }
 6663                         p6 = (struct sctp_ipv6addr_param *)phdr;
 6664 #ifdef INET6
 6665                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 6666                             sizeof(p6->addr));
 6667 #endif
 6668                         sa_touse = (struct sockaddr *)&sin4;
 6669                 }
 6670                 if (sa_touse) {
 6671                         /* ok, sa_touse points to one to check */
 6672                         fnd = 0;
 6673                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 6674                                 sa = (struct sockaddr *)&net->ro._l_addr;
 6675                                 if (sa->sa_family != sa_touse->sa_family) {
 6676                                         continue;
 6677                                 }
 6678                                 if (sa->sa_family == AF_INET) {
 6679                                         sa4 = (struct sockaddr_in *)sa;
 6680                                         if (sa4->sin_addr.s_addr ==
 6681                                             sin4.sin_addr.s_addr) {
 6682                                                 fnd = 1;
 6683                                                 break;
 6684                                         }
 6685                                 }
 6686 #ifdef INET6
 6687                                 if (sa->sa_family == AF_INET6) {
 6688                                         sa6 = (struct sockaddr_in6 *)sa;
 6689                                         if (SCTP6_ARE_ADDR_EQUAL(
 6690                                             sa6, &sin6)) {
 6691                                                 fnd = 1;
 6692                                                 break;
 6693                                         }
 6694                                 }
 6695 #endif
 6696                         }
 6697                         if (!fnd) {
 6698                                 /* New addr added! no need to look further */
 6699                                 return (1);
 6700                         }
 6701                 }
 6702                 offset += SCTP_SIZE32(plen);
 6703                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
 6704         }
 6705         return (0);
 6706 }
 6707 
 6708 /*
 6709  * Given a MBUF chain that was sent into us containing an INIT. Build a
 6710  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 6711  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 6712  * message (i.e. the struct sctp_init_msg).
 6713  */
 6714 void
 6715 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 6716     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
 6717     struct sctp_init_chunk *init_chk, uint32_t vrf_id, uint16_t port, int hold_inp_lock)
 6718 {
 6719         struct sctp_association *asoc;
 6720         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
 6721         struct sctp_init_msg *initackm_out;
 6722         struct sctp_ecn_supported_param *ecn;
 6723         struct sctp_prsctp_supported_param *prsctp;
 6724         struct sctp_ecn_nonce_supported_param *ecn_nonce;
 6725         struct sctp_supported_chunk_types_param *pr_supported;
 6726         union sctp_sockstore store, store1, *over_addr;
 6727         struct sockaddr_in *sin, *to_sin;
 6728 
 6729 #ifdef INET6
 6730         struct sockaddr_in6 *sin6, *to_sin6;
 6731 
 6732 #endif
 6733         struct ip *iph;
 6734 
 6735 #ifdef INET6
 6736         struct ip6_hdr *ip6;
 6737 
 6738 #endif
 6739         struct sockaddr *to;
 6740         struct sctp_state_cookie stc;
 6741         struct sctp_nets *net = NULL;
 6742         uint8_t *signature = NULL;
 6743         int cnt_inits_to = 0;
 6744         uint16_t his_limit, i_want;
 6745         int abort_flag, padval;
 6746         int num_ext;
 6747         int p_len;
 6748         int nat_friendly = 0;
 6749         struct socket *so;
 6750 
 6751         if (stcb)
 6752                 asoc = &stcb->asoc;
 6753         else
 6754                 asoc = NULL;
 6755         mp_last = NULL;
 6756         if ((asoc != NULL) &&
 6757             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
 6758             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
 6759                 /* new addresses, out of here in non-cookie-wait states */
 6760                 /*
 6761                  * Send a ABORT, we don't add the new address error clause
 6762                  * though we even set the T bit and copy in the 0 tag.. this
 6763                  * looks no different than if no listener was present.
 6764                  */
 6765                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id, port);
 6766                 return;
 6767         }
 6768         abort_flag = 0;
 6769         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 6770             (offset + sizeof(struct sctp_init_chunk)),
 6771             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
 6772         if (abort_flag) {
 6773 do_a_abort:
 6774                 sctp_send_abort(init_pkt, iphlen, sh,
 6775                     init_chk->init.initiate_tag, op_err, vrf_id, port);
 6776                 return;
 6777         }
 6778         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
 6779         if (m == NULL) {
 6780                 /* No memory, INIT timer will re-attempt. */
 6781                 if (op_err)
 6782                         sctp_m_freem(op_err);
 6783                 return;
 6784         }
 6785         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
 6786 
 6787         /* the time I built cookie */
 6788         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
 6789 
 6790         /* populate any tie tags */
 6791         if (asoc != NULL) {
 6792                 /* unlock before tag selections */
 6793                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
 6794                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
 6795                 stc.cookie_life = asoc->cookie_life;
 6796                 net = asoc->primary_destination;
 6797         } else {
 6798                 stc.tie_tag_my_vtag = 0;
 6799                 stc.tie_tag_peer_vtag = 0;
 6800                 /* life I will award this cookie */
 6801                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
 6802         }
 6803 
 6804         /* copy in the ports for later check */
 6805         stc.myport = sh->dest_port;
 6806         stc.peerport = sh->src_port;
 6807 
 6808         /*
 6809          * If we wanted to honor cookie life extentions, we would add to
 6810          * stc.cookie_life. For now we should NOT honor any extension
 6811          */
 6812         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
 6813         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 6814                 struct inpcb *in_inp;
 6815 
 6816                 /* Its a V6 socket */
 6817                 in_inp = (struct inpcb *)inp;
 6818                 stc.ipv6_addr_legal = 1;
 6819                 /* Now look at the binding flag to see if V4 will be legal */
 6820                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
 6821                         stc.ipv4_addr_legal = 1;
 6822                 } else {
 6823                         /* V4 addresses are NOT legal on the association */
 6824                         stc.ipv4_addr_legal = 0;
 6825                 }
 6826         } else {
 6827                 /* Its a V4 socket, no - V6 */
 6828                 stc.ipv4_addr_legal = 1;
 6829                 stc.ipv6_addr_legal = 0;
 6830         }
 6831 
 6832 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
 6833         stc.ipv4_scope = 1;
 6834 #else
 6835         stc.ipv4_scope = 0;
 6836 #endif
 6837         /* now for scope setup */
 6838         memset((caddr_t)&store, 0, sizeof(store));
 6839         memset((caddr_t)&store1, 0, sizeof(store1));
 6840         sin = &store.sin;
 6841         to_sin = &store1.sin;
 6842 #ifdef INET6
 6843         sin6 = &store.sin6;
 6844         to_sin6 = &store1.sin6;
 6845 #endif
 6846         iph = mtod(init_pkt, struct ip *);
 6847         /* establish the to_addr's */
 6848         switch (iph->ip_v) {
 6849         case IPVERSION:
 6850                 to_sin->sin_port = sh->dest_port;
 6851                 to_sin->sin_family = AF_INET;
 6852                 to_sin->sin_len = sizeof(struct sockaddr_in);
 6853                 to_sin->sin_addr = iph->ip_dst;
 6854                 break;
 6855 #ifdef INET6
 6856         case IPV6_VERSION >> 4:
 6857                 ip6 = mtod(init_pkt, struct ip6_hdr *);
 6858                 to_sin6->sin6_addr = ip6->ip6_dst;
 6859                 to_sin6->sin6_scope_id = 0;
 6860                 to_sin6->sin6_port = sh->dest_port;
 6861                 to_sin6->sin6_family = AF_INET6;
 6862                 to_sin6->sin6_len = sizeof(struct sockaddr_in6);
 6863                 break;
 6864 #endif
 6865         default:
 6866                 goto do_a_abort;
 6867                 break;
 6868         };
 6869 
 6870         if (net == NULL) {
 6871                 to = (struct sockaddr *)&store;
 6872                 switch (iph->ip_v) {
 6873                 case IPVERSION:
 6874                         {
 6875                                 sin->sin_family = AF_INET;
 6876                                 sin->sin_len = sizeof(struct sockaddr_in);
 6877                                 sin->sin_port = sh->src_port;
 6878                                 sin->sin_addr = iph->ip_src;
 6879                                 /* lookup address */
 6880                                 stc.address[0] = sin->sin_addr.s_addr;
 6881                                 stc.address[1] = 0;
 6882                                 stc.address[2] = 0;
 6883                                 stc.address[3] = 0;
 6884                                 stc.addr_type = SCTP_IPV4_ADDRESS;
 6885                                 /* local from address */
 6886                                 stc.laddress[0] = to_sin->sin_addr.s_addr;
 6887                                 stc.laddress[1] = 0;
 6888                                 stc.laddress[2] = 0;
 6889                                 stc.laddress[3] = 0;
 6890                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
 6891                                 /* scope_id is only for v6 */
 6892                                 stc.scope_id = 0;
 6893 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
 6894                                 if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
 6895                                         stc.ipv4_scope = 1;
 6896                                 }
 6897 #else
 6898                                 stc.ipv4_scope = 1;
 6899 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
 6900                                 /* Must use the address in this case */
 6901                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
 6902                                         stc.loopback_scope = 1;
 6903                                         stc.ipv4_scope = 1;
 6904                                         stc.site_scope = 1;
 6905                                         stc.local_scope = 0;
 6906                                 }
 6907                                 break;
 6908                         }
 6909 #ifdef INET6
 6910                 case IPV6_VERSION >> 4:
 6911                         {
 6912                                 ip6 = mtod(init_pkt, struct ip6_hdr *);
 6913                                 sin6->sin6_family = AF_INET6;
 6914                                 sin6->sin6_len = sizeof(struct sockaddr_in6);
 6915                                 sin6->sin6_port = sh->src_port;
 6916                                 sin6->sin6_addr = ip6->ip6_src;
 6917                                 /* lookup address */
 6918                                 memcpy(&stc.address, &sin6->sin6_addr,
 6919                                     sizeof(struct in6_addr));
 6920                                 sin6->sin6_scope_id = 0;
 6921                                 stc.addr_type = SCTP_IPV6_ADDRESS;
 6922                                 stc.scope_id = 0;
 6923                                 if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
 6924                                         /*
 6925                                          * FIX ME: does this have scope from
 6926                                          * rcvif?
 6927                                          */
 6928                                         (void)sa6_recoverscope(sin6);
 6929                                         stc.scope_id = sin6->sin6_scope_id;
 6930                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
 6931                                         stc.loopback_scope = 1;
 6932                                         stc.local_scope = 0;
 6933                                         stc.site_scope = 1;
 6934                                         stc.ipv4_scope = 1;
 6935                                 } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 6936                                         /*
 6937                                          * If the new destination is a
 6938                                          * LINK_LOCAL we must have common
 6939                                          * both site and local scope. Don't
 6940                                          * set local scope though since we
 6941                                          * must depend on the source to be
 6942                                          * added implicitly. We cannot
 6943                                          * assure just because we share one
 6944                                          * link that all links are common.
 6945                                          */
 6946                                         stc.local_scope = 0;
 6947                                         stc.site_scope = 1;
 6948                                         stc.ipv4_scope = 1;
 6949                                         /*
 6950                                          * we start counting for the private
 6951                                          * address stuff at 1. since the
 6952                                          * link local we source from won't
 6953                                          * show up in our scoped count.
 6954                                          */
 6955                                         cnt_inits_to = 1;
 6956                                         /*
 6957                                          * pull out the scope_id from
 6958                                          * incoming pkt
 6959                                          */
 6960                                         /*
 6961                                          * FIX ME: does this have scope from
 6962                                          * rcvif?
 6963                                          */
 6964                                         (void)sa6_recoverscope(sin6);
 6965                                         stc.scope_id = sin6->sin6_scope_id;
 6966                                         sa6_embedscope(sin6, MODULE_GLOBAL(MOD_INET6, ip6_use_defzone));
 6967                                 } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
 6968                                         /*
 6969                                          * If the new destination is
 6970                                          * SITE_LOCAL then we must have site
 6971                                          * scope in common.
 6972                                          */
 6973                                         stc.site_scope = 1;
 6974                                 }
 6975                                 memcpy(&stc.laddress, &to_sin6->sin6_addr, sizeof(struct in6_addr));
 6976                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
 6977                                 break;
 6978                         }
 6979 #endif
 6980                 default:
 6981                         /* TSNH */
 6982                         goto do_a_abort;
 6983                         break;
 6984                 }
 6985         } else {
 6986                 /* set the scope per the existing tcb */
 6987 
 6988 #ifdef INET6
 6989                 struct sctp_nets *lnet;
 6990 
 6991 #endif
 6992 
 6993                 stc.loopback_scope = asoc->loopback_scope;
 6994                 stc.ipv4_scope = asoc->ipv4_local_scope;
 6995                 stc.site_scope = asoc->site_scope;
 6996                 stc.local_scope = asoc->local_scope;
 6997 #ifdef INET6
 6998                 /* Why do we not consider IPv4 LL addresses? */
 6999                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 7000                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
 7001                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
 7002                                         /*
 7003                                          * if we have a LL address, start
 7004                                          * counting at 1.
 7005                                          */
 7006                                         cnt_inits_to = 1;
 7007                                 }
 7008                         }
 7009                 }
 7010 #endif
 7011                 /* use the net pointer */
 7012                 to = (struct sockaddr *)&net->ro._l_addr;
 7013                 switch (to->sa_family) {
 7014                 case AF_INET:
 7015                         sin = (struct sockaddr_in *)to;
 7016                         stc.address[0] = sin->sin_addr.s_addr;
 7017                         stc.address[1] = 0;
 7018                         stc.address[2] = 0;
 7019                         stc.address[3] = 0;
 7020                         stc.addr_type = SCTP_IPV4_ADDRESS;
 7021                         if (net->src_addr_selected == 0) {
 7022                                 /*
 7023                                  * strange case here, the INIT should have
 7024                                  * did the selection.
 7025                                  */
 7026                                 net->ro._s_addr = sctp_source_address_selection(inp,
 7027                                     stcb, (sctp_route_t *) & net->ro,
 7028                                     net, 0, vrf_id);
 7029                                 if (net->ro._s_addr == NULL)
 7030                                         return;
 7031 
 7032                                 net->src_addr_selected = 1;
 7033 
 7034                         }
 7035                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
 7036                         stc.laddress[1] = 0;
 7037                         stc.laddress[2] = 0;
 7038                         stc.laddress[3] = 0;
 7039                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 7040                         break;
 7041 #ifdef INET6
 7042                 case AF_INET6:
 7043                         sin6 = (struct sockaddr_in6 *)to;
 7044                         memcpy(&stc.address, &sin6->sin6_addr,
 7045                             sizeof(struct in6_addr));
 7046                         stc.addr_type = SCTP_IPV6_ADDRESS;
 7047                         if (net->src_addr_selected == 0) {
 7048                                 /*
 7049                                  * strange case here, the INIT should have
 7050                                  * did the selection.
 7051                                  */
 7052                                 net->ro._s_addr = sctp_source_address_selection(inp,
 7053                                     stcb, (sctp_route_t *) & net->ro,
 7054                                     net, 0, vrf_id);
 7055                                 if (net->ro._s_addr == NULL)
 7056                                         return;
 7057 
 7058                                 net->src_addr_selected = 1;
 7059                         }
 7060                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
 7061                             sizeof(struct in6_addr));
 7062                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 7063                         break;
 7064 #endif
 7065                 }
 7066         }
 7067         /* Now lets put the SCTP header in place */
 7068         initackm_out = mtod(m, struct sctp_init_msg *);
 7069         initackm_out->sh.src_port = inp->sctp_lport;
 7070         initackm_out->sh.dest_port = sh->src_port;
 7071         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
 7072         /* Save it off for quick ref */
 7073         stc.peers_vtag = init_chk->init.initiate_tag;
 7074         initackm_out->sh.checksum = 0;  /* calculate later */
 7075         /* who are we */
 7076         memcpy(stc.identification, SCTP_VERSION_STRING,
 7077             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
 7078         /* now the chunk header */
 7079         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
 7080         initackm_out->msg.ch.chunk_flags = 0;
 7081         /* fill in later from mbuf we build */
 7082         initackm_out->msg.ch.chunk_length = 0;
 7083         /* place in my tag */
 7084         if ((asoc != NULL) &&
 7085             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 7086             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
 7087             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
 7088                 /* re-use the v-tags and init-seq here */
 7089                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
 7090                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
 7091         } else {
 7092                 uint32_t vtag, itsn;
 7093 
 7094                 if (hold_inp_lock) {
 7095                         SCTP_INP_INCR_REF(inp);
 7096                         SCTP_INP_RUNLOCK(inp);
 7097                 }
 7098                 if (asoc) {
 7099                         atomic_add_int(&asoc->refcnt, 1);
 7100                         SCTP_TCB_UNLOCK(stcb);
 7101         new_tag:
 7102                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 7103                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
 7104                                 /*
 7105                                  * Got a duplicate vtag on some guy behind a
 7106                                  * nat make sure we don't use it.
 7107                                  */
 7108                                 goto new_tag;
 7109                         }
 7110                         initackm_out->msg.init.initiate_tag = htonl(vtag);
 7111                         /* get a TSN to use too */
 7112                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 7113                         initackm_out->msg.init.initial_tsn = htonl(itsn);
 7114                         SCTP_TCB_LOCK(stcb);
 7115                         atomic_add_int(&asoc->refcnt, -1);
 7116                 } else {
 7117                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 7118                         initackm_out->msg.init.initiate_tag = htonl(vtag);
 7119                         /* get a TSN to use too */
 7120                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 7121                 }
 7122                 if (hold_inp_lock) {
 7123                         SCTP_INP_RLOCK(inp);
 7124                         SCTP_INP_DECR_REF(inp);
 7125                 }
 7126         }
 7127         /* save away my tag to */
 7128         stc.my_vtag = initackm_out->msg.init.initiate_tag;
 7129 
 7130         /* set up some of the credits. */
 7131         so = inp->sctp_socket;
 7132         if (so == NULL) {
 7133                 /* memory problem */
 7134                 sctp_m_freem(m);
 7135                 return;
 7136         } else {
 7137                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 7138         }
 7139         /* set what I want */
 7140         his_limit = ntohs(init_chk->init.num_inbound_streams);
 7141         /* choose what I want */
 7142         if (asoc != NULL) {
 7143                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
 7144                         i_want = asoc->streamoutcnt;
 7145                 } else {
 7146                         i_want = inp->sctp_ep.pre_open_stream_count;
 7147                 }
 7148         } else {
 7149                 i_want = inp->sctp_ep.pre_open_stream_count;
 7150         }
 7151         if (his_limit < i_want) {
 7152                 /* I Want more :< */
 7153                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
 7154         } else {
 7155                 /* I can have what I want :> */
 7156                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
 7157         }
 7158         /* tell him his limt. */
 7159         initackm_out->msg.init.num_inbound_streams =
 7160             htons(inp->sctp_ep.max_open_streams_intome);
 7161         /* setup the ECN pointer */
 7162 
 7163         if (inp->sctp_ep.adaptation_layer_indicator) {
 7164                 struct sctp_adaptation_layer_indication *ali;
 7165 
 7166                 ali = (struct sctp_adaptation_layer_indication *)(
 7167                     (caddr_t)initackm_out + sizeof(*initackm_out));
 7168                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 7169                 ali->ph.param_length = htons(sizeof(*ali));
 7170                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
 7171                 SCTP_BUF_LEN(m) += sizeof(*ali);
 7172                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
 7173                     sizeof(*ali));
 7174         } else {
 7175                 ecn = (struct sctp_ecn_supported_param *)(
 7176                     (caddr_t)initackm_out + sizeof(*initackm_out));
 7177         }
 7178 
 7179         /* ECN parameter */
 7180         if (SCTP_BASE_SYSCTL(sctp_ecn_enable) == 1) {
 7181                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
 7182                 ecn->ph.param_length = htons(sizeof(*ecn));
 7183                 SCTP_BUF_LEN(m) += sizeof(*ecn);
 7184 
 7185                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
 7186                     sizeof(*ecn));
 7187         } else {
 7188                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
 7189         }
 7190         /* And now tell the peer we do  pr-sctp */
 7191         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
 7192         prsctp->ph.param_length = htons(sizeof(*prsctp));
 7193         SCTP_BUF_LEN(m) += sizeof(*prsctp);
 7194         if (nat_friendly) {
 7195                 /* Add NAT friendly parameter */
 7196                 struct sctp_paramhdr *ph;
 7197 
 7198                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 7199                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 7200                 ph->param_length = htons(sizeof(struct sctp_paramhdr));
 7201                 SCTP_BUF_LEN(m) += sizeof(struct sctp_paramhdr);
 7202         }
 7203         /* And now tell the peer we do all the extensions */
 7204         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 7205         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 7206         num_ext = 0;
 7207         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 7208         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 7209         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 7210         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 7211         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 7212         if (!SCTP_BASE_SYSCTL(sctp_auth_disable))
 7213                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 7214         /*
 7215          * EY  if the sysctl variable is set, tell the assoc. initiator that
 7216          * we do nr_sack
 7217          */
 7218         if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off))
 7219                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 7220         p_len = sizeof(*pr_supported) + num_ext;
 7221         pr_supported->ph.param_length = htons(p_len);
 7222         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
 7223         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 7224 
 7225         /* ECN nonce: And now tell the peer we support ECN nonce */
 7226         if (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) {
 7227                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
 7228                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
 7229                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
 7230                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
 7231                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
 7232         }
 7233         /* add authentication parameters */
 7234         if (!SCTP_BASE_SYSCTL(sctp_auth_disable)) {
 7235                 struct sctp_auth_random *randp;
 7236                 struct sctp_auth_hmac_algo *hmacs;
 7237                 struct sctp_auth_chunk_list *chunks;
 7238                 uint16_t random_len;
 7239 
 7240                 /* generate and add RANDOM parameter */
 7241                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 7242                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 7243                 randp->ph.param_type = htons(SCTP_RANDOM);
 7244                 p_len = sizeof(*randp) + random_len;
 7245                 randp->ph.param_length = htons(p_len);
 7246                 SCTP_READ_RANDOM(randp->random_data, random_len);
 7247                 /* zero out any padding required */
 7248                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
 7249                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 7250 
 7251                 /* add HMAC_ALGO parameter */
 7252                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 7253                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 7254                     (uint8_t *) hmacs->hmac_ids);
 7255                 if (p_len > 0) {
 7256                         p_len += sizeof(*hmacs);
 7257                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 7258                         hmacs->ph.param_length = htons(p_len);
 7259                         /* zero out any padding required */
 7260                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
 7261                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 7262                 }
 7263                 /* add CHUNKS parameter */
 7264                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 7265                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 7266                     chunks->chunk_types);
 7267                 if (p_len > 0) {
 7268                         p_len += sizeof(*chunks);
 7269                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 7270                         chunks->ph.param_length = htons(p_len);
 7271                         /* zero out any padding required */
 7272                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
 7273                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 7274                 }
 7275         }
 7276         m_at = m;
 7277         /* now the addresses */
 7278         {
 7279                 struct sctp_scoping scp;
 7280 
 7281                 /*
 7282                  * To optimize this we could put the scoping stuff into a
 7283                  * structure and remove the individual uint8's from the stc
 7284                  * structure. Then we could just sifa in the address within
 7285                  * the stc.. but for now this is a quick hack to get the
 7286                  * address stuff teased apart.
 7287                  */
 7288                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 7289                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 7290                 scp.loopback_scope = stc.loopback_scope;
 7291                 scp.ipv4_local_scope = stc.ipv4_scope;
 7292                 scp.local_scope = stc.local_scope;
 7293                 scp.site_scope = stc.site_scope;
 7294                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
 7295         }
 7296 
 7297         /* tack on the operational error if present */
 7298         if (op_err) {
 7299                 struct mbuf *ol;
 7300                 int llen;
 7301 
 7302                 llen = 0;
 7303                 ol = op_err;
 7304                 while (ol) {
 7305                         llen += SCTP_BUF_LEN(ol);
 7306                         ol = SCTP_BUF_NEXT(ol);
 7307                 }
 7308                 if (llen % 4) {
 7309                         /* must add a pad to the param */
 7310                         uint32_t cpthis = 0;
 7311                         int padlen;
 7312 
 7313                         padlen = 4 - (llen % 4);
 7314                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
 7315                 }
 7316                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 7317                         m_at = SCTP_BUF_NEXT(m_at);
 7318                 }
 7319                 SCTP_BUF_NEXT(m_at) = op_err;
 7320                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 7321                         m_at = SCTP_BUF_NEXT(m_at);
 7322                 }
 7323         }
 7324         /* pre-calulate the size and update pkt header and chunk header */
 7325         p_len = 0;
 7326         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 7327                 p_len += SCTP_BUF_LEN(m_tmp);
 7328                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 7329                         /* m_tmp should now point to last one */
 7330                         break;
 7331                 }
 7332         }
 7333 
 7334         /* Now we must build a cookie */
 7335         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
 7336             sizeof(struct sctphdr), &stc, &signature);
 7337         if (m_cookie == NULL) {
 7338                 /* memory problem */
 7339                 sctp_m_freem(m);
 7340                 return;
 7341         }
 7342         /* Now append the cookie to the end and update the space/size */
 7343         SCTP_BUF_NEXT(m_tmp) = m_cookie;
 7344 
 7345         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 7346                 p_len += SCTP_BUF_LEN(m_tmp);
 7347                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 7348                         /* m_tmp should now point to last one */
 7349                         mp_last = m_tmp;
 7350                         break;
 7351                 }
 7352         }
 7353         /*
 7354          * Place in the size, but we don't include the last pad (if any) in
 7355          * the INIT-ACK.
 7356          */
 7357         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
 7358 
 7359         /*
 7360          * Time to sign the cookie, we don't sign over the cookie signature
 7361          * though thus we set trailer.
 7362          */
 7363         (void)sctp_hmac_m(SCTP_HMAC,
 7364             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 7365             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 7366             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
 7367         /*
 7368          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 7369          * here since the timer will drive a retranmission.
 7370          */
 7371         padval = p_len % 4;
 7372         if ((padval) && (mp_last)) {
 7373                 /* see my previous comments on mp_last */
 7374                 int ret;
 7375 
 7376                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
 7377                 if (ret) {
 7378                         /* Houston we have a problem, no space */
 7379                         sctp_m_freem(m);
 7380                         return;
 7381                 }
 7382                 p_len += padval;
 7383         }
 7384         if (stc.loopback_scope) {
 7385                 over_addr = &store1;
 7386         } else {
 7387                 over_addr = NULL;
 7388 
 7389         }
 7390 
 7391         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 7392             0, NULL, 0, port, SCTP_SO_NOT_LOCKED, over_addr);
 7393         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 7394 }
 7395 
 7396 
 7397 void
 7398 sctp_insert_on_wheel(struct sctp_tcb *stcb,
 7399     struct sctp_association *asoc,
 7400     struct sctp_stream_out *strq, int holds_lock)
 7401 {
 7402         struct sctp_stream_out *stre, *strn;
 7403 
 7404         if (holds_lock == 0) {
 7405                 SCTP_TCB_SEND_LOCK(stcb);
 7406         }
 7407         if ((strq->next_spoke.tqe_next) ||
 7408             (strq->next_spoke.tqe_prev)) {
 7409                 /* already on wheel */
 7410                 goto outof_here;
 7411         }
 7412         stre = TAILQ_FIRST(&asoc->out_wheel);
 7413         if (stre == NULL) {
 7414                 /* only one on wheel */
 7415                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
 7416                 goto outof_here;
 7417         }
 7418         for (; stre; stre = strn) {
 7419                 strn = TAILQ_NEXT(stre, next_spoke);
 7420                 if (stre->stream_no > strq->stream_no) {
 7421                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
 7422                         goto outof_here;
 7423                 } else if (stre->stream_no == strq->stream_no) {
 7424                         /* huh, should not happen */
 7425                         goto outof_here;
 7426                 } else if (strn == NULL) {
 7427                         /* next one is null */
 7428                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
 7429                             next_spoke);
 7430                 }
 7431         }
 7432 outof_here:
 7433         if (holds_lock == 0) {
 7434                 SCTP_TCB_SEND_UNLOCK(stcb);
 7435         }
 7436 }
 7437 
 7438 static void
 7439 sctp_remove_from_wheel(struct sctp_tcb *stcb,
 7440     struct sctp_association *asoc,
 7441     struct sctp_stream_out *strq)
 7442 {
 7443         /* take off and then setup so we know it is not on the wheel */
 7444         SCTP_TCB_SEND_LOCK(stcb);
 7445         if (TAILQ_FIRST(&strq->outqueue)) {
 7446                 /* more was added */
 7447                 SCTP_TCB_SEND_UNLOCK(stcb);
 7448                 return;
 7449         }
 7450         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
 7451         strq->next_spoke.tqe_next = NULL;
 7452         strq->next_spoke.tqe_prev = NULL;
 7453         SCTP_TCB_SEND_UNLOCK(stcb);
 7454 }
 7455 
 7456 static void
 7457 sctp_prune_prsctp(struct sctp_tcb *stcb,
 7458     struct sctp_association *asoc,
 7459     struct sctp_sndrcvinfo *srcv,
 7460     int dataout)
 7461 {
 7462         int freed_spc = 0;
 7463         struct sctp_tmit_chunk *chk, *nchk;
 7464 
 7465         SCTP_TCB_LOCK_ASSERT(stcb);
 7466         if ((asoc->peer_supports_prsctp) &&
 7467             (asoc->sent_queue_cnt_removeable > 0)) {
 7468                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 7469                         /*
 7470                          * Look for chunks marked with the PR_SCTP flag AND
 7471                          * the buffer space flag. If the one being sent is
 7472                          * equal or greater priority then purge the old one
 7473                          * and free some space.
 7474                          */
 7475                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 7476                                 /*
 7477                                  * This one is PR-SCTP AND buffer space
 7478                                  * limited type
 7479                                  */
 7480                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 7481                                         /*
 7482                                          * Lower numbers equates to higher
 7483                                          * priority so if the one we are
 7484                                          * looking at has a larger or equal
 7485                                          * priority we want to drop the data
 7486                                          * and NOT retransmit it.
 7487                                          */
 7488                                         if (chk->data) {
 7489                                                 /*
 7490                                                  * We release the book_size
 7491                                                  * if the mbuf is here
 7492                                                  */
 7493                                                 int ret_spc;
 7494                                                 int cause;
 7495 
 7496                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 7497                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
 7498                                                 else
 7499                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
 7500                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 7501                                                     cause,
 7502                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
 7503                                                 freed_spc += ret_spc;
 7504                                                 if (freed_spc >= dataout) {
 7505                                                         return;
 7506                                                 }
 7507                                         }       /* if chunk was present */
 7508                                 }       /* if of sufficent priority */
 7509                         }       /* if chunk has enabled */
 7510                 }               /* tailqforeach */
 7511 
 7512                 chk = TAILQ_FIRST(&asoc->send_queue);
 7513                 while (chk) {
 7514                         nchk = TAILQ_NEXT(chk, sctp_next);
 7515                         /* Here we must move to the sent queue and mark */
 7516                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
 7517                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 7518                                         if (chk->data) {
 7519                                                 /*
 7520                                                  * We release the book_size
 7521                                                  * if the mbuf is here
 7522                                                  */
 7523                                                 int ret_spc;
 7524 
 7525                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 7526                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
 7527                                                     &asoc->send_queue, SCTP_SO_LOCKED);
 7528 
 7529                                                 freed_spc += ret_spc;
 7530                                                 if (freed_spc >= dataout) {
 7531                                                         return;
 7532                                                 }
 7533                                         }       /* end if chk->data */
 7534                                 }       /* end if right class */
 7535                         }       /* end if chk pr-sctp */
 7536                         chk = nchk;
 7537                 }               /* end while (chk) */
 7538         }                       /* if enabled in asoc */
 7539 }
 7540 
 7541 int
 7542 sctp_get_frag_point(struct sctp_tcb *stcb,
 7543     struct sctp_association *asoc)
 7544 {
 7545         int siz, ovh;
 7546 
 7547         /*
 7548          * For endpoints that have both v6 and v4 addresses we must reserve
 7549          * room for the ipv6 header, for those that are only dealing with V4
 7550          * we use a larger frag point.
 7551          */
 7552         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 7553                 ovh = SCTP_MED_OVERHEAD;
 7554         } else {
 7555                 ovh = SCTP_MED_V4_OVERHEAD;
 7556         }
 7557 
 7558         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
 7559                 siz = asoc->smallest_mtu - ovh;
 7560         else
 7561                 siz = (stcb->asoc.sctp_frag_point - ovh);
 7562         /*
 7563          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
 7564          */
 7565         /* A data chunk MUST fit in a cluster */
 7566         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
 7567         /* } */
 7568 
 7569         /* adjust for an AUTH chunk if DATA requires auth */
 7570         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
 7571                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 7572 
 7573         if (siz % 4) {
 7574                 /* make it an even word boundary please */
 7575                 siz -= (siz % 4);
 7576         }
 7577         return (siz);
 7578 }
 7579 
 7580 static void
 7581 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
 7582     struct sctp_stream_queue_pending *sp)
 7583 {
 7584         sp->pr_sctp_on = 0;
 7585         if (stcb->asoc.peer_supports_prsctp) {
 7586                 /*
 7587                  * We assume that the user wants PR_SCTP_TTL if the user
 7588                  * provides a positive lifetime but does not specify any
 7589                  * PR_SCTP policy. This is a BAD assumption and causes
 7590                  * problems at least with the U-Vancovers MPI folks. I will
 7591                  * change this to be no policy means NO PR-SCTP.
 7592                  */
 7593                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 7594                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 7595                         sp->pr_sctp_on = 1;
 7596                 } else {
 7597                         return;
 7598                 }
 7599                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 7600                 case CHUNK_FLAGS_PR_SCTP_BUF:
 7601                         /*
 7602                          * Time to live is a priority stored in tv_sec when
 7603                          * doing the buffer drop thing.
 7604                          */
 7605                         sp->ts.tv_sec = sp->timetolive;
 7606                         sp->ts.tv_usec = 0;
 7607                         break;
 7608                 case CHUNK_FLAGS_PR_SCTP_TTL:
 7609                         {
 7610                                 struct timeval tv;
 7611 
 7612                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 7613                                 tv.tv_sec = sp->timetolive / 1000;
 7614                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 7615                                 /*
 7616                                  * TODO sctp_constants.h needs alternative
 7617                                  * time macros when _KERNEL is undefined.
 7618                                  */
 7619                                 timevaladd(&sp->ts, &tv);
 7620                         }
 7621                         break;
 7622                 case CHUNK_FLAGS_PR_SCTP_RTX:
 7623                         /*
 7624                          * Time to live is a the number or retransmissions
 7625                          * stored in tv_sec.
 7626                          */
 7627                         sp->ts.tv_sec = sp->timetolive;
 7628                         sp->ts.tv_usec = 0;
 7629                         break;
 7630                 default:
 7631                         SCTPDBG(SCTP_DEBUG_USRREQ1,
 7632                             "Unknown PR_SCTP policy %u.\n",
 7633                             PR_SCTP_POLICY(sp->sinfo_flags));
 7634                         break;
 7635                 }
 7636         }
 7637 }
 7638 
 7639 static int
 7640 sctp_msg_append(struct sctp_tcb *stcb,
 7641     struct sctp_nets *net,
 7642     struct mbuf *m,
 7643     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
 7644 {
 7645         int error = 0, holds_lock;
 7646         struct mbuf *at;
 7647         struct sctp_stream_queue_pending *sp = NULL;
 7648         struct sctp_stream_out *strm;
 7649 
 7650         /*
 7651          * Given an mbuf chain, put it into the association send queue and
 7652          * place it on the wheel
 7653          */
 7654         holds_lock = hold_stcb_lock;
 7655         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 7656                 /* Invalid stream number */
 7657                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 7658                 error = EINVAL;
 7659                 goto out_now;
 7660         }
 7661         if ((stcb->asoc.stream_locked) &&
 7662             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 7663                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 7664                 error = EINVAL;
 7665                 goto out_now;
 7666         }
 7667         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 7668         /* Now can we send this? */
 7669         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
 7670             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 7671             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 7672             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 7673                 /* got data while shutting down */
 7674                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
 7675                 error = ECONNRESET;
 7676                 goto out_now;
 7677         }
 7678         sctp_alloc_a_strmoq(stcb, sp);
 7679         if (sp == NULL) {
 7680                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 7681                 error = ENOMEM;
 7682                 goto out_now;
 7683         }
 7684         sp->sinfo_flags = srcv->sinfo_flags;
 7685         sp->timetolive = srcv->sinfo_timetolive;
 7686         sp->ppid = srcv->sinfo_ppid;
 7687         sp->context = srcv->sinfo_context;
 7688         sp->strseq = 0;
 7689         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 7690                 sp->net = net;
 7691                 sp->addr_over = 1;
 7692         } else {
 7693                 sp->net = stcb->asoc.primary_destination;
 7694                 sp->addr_over = 0;
 7695         }
 7696         atomic_add_int(&sp->net->ref_count, 1);
 7697         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 7698         sp->stream = srcv->sinfo_stream;
 7699         sp->msg_is_complete = 1;
 7700         sp->sender_all_done = 1;
 7701         sp->some_taken = 0;
 7702         sp->data = m;
 7703         sp->tail_mbuf = NULL;
 7704         sp->length = 0;
 7705         at = m;
 7706         sctp_set_prsctp_policy(stcb, sp);
 7707         /*
 7708          * We could in theory (for sendall) sifa the length in, but we would
 7709          * still have to hunt through the chain since we need to setup the
 7710          * tail_mbuf
 7711          */
 7712         while (at) {
 7713                 if (SCTP_BUF_NEXT(at) == NULL)
 7714                         sp->tail_mbuf = at;
 7715                 sp->length += SCTP_BUF_LEN(at);
 7716                 at = SCTP_BUF_NEXT(at);
 7717         }
 7718         SCTP_TCB_SEND_LOCK(stcb);
 7719         sctp_snd_sb_alloc(stcb, sp->length);
 7720         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 7721         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 7722         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
 7723                 sp->strseq = strm->next_sequence_sent;
 7724                 strm->next_sequence_sent++;
 7725         }
 7726         if ((strm->next_spoke.tqe_next == NULL) &&
 7727             (strm->next_spoke.tqe_prev == NULL)) {
 7728                 /* Not on wheel, insert */
 7729                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
 7730         }
 7731         m = NULL;
 7732         SCTP_TCB_SEND_UNLOCK(stcb);
 7733 out_now:
 7734         if (m) {
 7735                 sctp_m_freem(m);
 7736         }
 7737         return (error);
 7738 }
 7739 
 7740 
 7741 static struct mbuf *
 7742 sctp_copy_mbufchain(struct mbuf *clonechain,
 7743     struct mbuf *outchain,
 7744     struct mbuf **endofchain,
 7745     int can_take_mbuf,
 7746     int sizeofcpy,
 7747     uint8_t copy_by_ref)
 7748 {
 7749         struct mbuf *m;
 7750         struct mbuf *appendchain;
 7751         caddr_t cp;
 7752         int len;
 7753 
 7754         if (endofchain == NULL) {
 7755                 /* error */
 7756 error_out:
 7757                 if (outchain)
 7758                         sctp_m_freem(outchain);
 7759                 return (NULL);
 7760         }
 7761         if (can_take_mbuf) {
 7762                 appendchain = clonechain;
 7763         } else {
 7764                 if (!copy_by_ref &&
 7765                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
 7766                     ) {
 7767                         /* Its not in a cluster */
 7768                         if (*endofchain == NULL) {
 7769                                 /* lets get a mbuf cluster */
 7770                                 if (outchain == NULL) {
 7771                                         /* This is the general case */
 7772                         new_mbuf:
 7773                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
 7774                                         if (outchain == NULL) {
 7775                                                 goto error_out;
 7776                                         }
 7777                                         SCTP_BUF_LEN(outchain) = 0;
 7778                                         *endofchain = outchain;
 7779                                         /* get the prepend space */
 7780                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 7781                                 } else {
 7782                                         /*
 7783                                          * We really should not get a NULL
 7784                                          * in endofchain
 7785                                          */
 7786                                         /* find end */
 7787                                         m = outchain;
 7788                                         while (m) {
 7789                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 7790                                                         *endofchain = m;
 7791                                                         break;
 7792                                                 }
 7793                                                 m = SCTP_BUF_NEXT(m);
 7794                                         }
 7795                                         /* sanity */
 7796                                         if (*endofchain == NULL) {
 7797                                                 /*
 7798                                                  * huh, TSNH XXX maybe we
 7799                                                  * should panic
 7800                                                  */
 7801                                                 sctp_m_freem(outchain);
 7802                                                 goto new_mbuf;
 7803                                         }
 7804                                 }
 7805                                 /* get the new end of length */
 7806                                 len = M_TRAILINGSPACE(*endofchain);
 7807                         } else {
 7808                                 /* how much is left at the end? */
 7809                                 len = M_TRAILINGSPACE(*endofchain);
 7810                         }
 7811                         /* Find the end of the data, for appending */
 7812                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 7813 
 7814                         /* Now lets copy it out */
 7815                         if (len >= sizeofcpy) {
 7816                                 /* It all fits, copy it in */
 7817                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 7818                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 7819                         } else {
 7820                                 /* fill up the end of the chain */
 7821                                 if (len > 0) {
 7822                                         m_copydata(clonechain, 0, len, cp);
 7823                                         SCTP_BUF_LEN((*endofchain)) += len;
 7824                                         /* now we need another one */
 7825                                         sizeofcpy -= len;
 7826                                 }
 7827                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
 7828                                 if (m == NULL) {
 7829                                         /* We failed */
 7830                                         goto error_out;
 7831                                 }
 7832                                 SCTP_BUF_NEXT((*endofchain)) = m;
 7833                                 *endofchain = m;
 7834                                 cp = mtod((*endofchain), caddr_t);
 7835                                 m_copydata(clonechain, len, sizeofcpy, cp);
 7836                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 7837                         }
 7838                         return (outchain);
 7839                 } else {
 7840                         /* copy the old fashion way */
 7841                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
 7842 #ifdef SCTP_MBUF_LOGGING
 7843                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7844                                 struct mbuf *mat;
 7845 
 7846                                 mat = appendchain;
 7847                                 while (mat) {
 7848                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
 7849                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 7850                                         }
 7851                                         mat = SCTP_BUF_NEXT(mat);
 7852                                 }
 7853                         }
 7854 #endif
 7855                 }
 7856         }
 7857         if (appendchain == NULL) {
 7858                 /* error */
 7859                 if (outchain)
 7860                         sctp_m_freem(outchain);
 7861                 return (NULL);
 7862         }
 7863         if (outchain) {
 7864                 /* tack on to the end */
 7865                 if (*endofchain != NULL) {
 7866                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 7867                 } else {
 7868                         m = outchain;
 7869                         while (m) {
 7870                                 if (SCTP_BUF_NEXT(m) == NULL) {
 7871                                         SCTP_BUF_NEXT(m) = appendchain;
 7872                                         break;
 7873                                 }
 7874                                 m = SCTP_BUF_NEXT(m);
 7875                         }
 7876                 }
 7877                 /*
 7878                  * save off the end and update the end-chain postion
 7879                  */
 7880                 m = appendchain;
 7881                 while (m) {
 7882                         if (SCTP_BUF_NEXT(m) == NULL) {
 7883                                 *endofchain = m;
 7884                                 break;
 7885                         }
 7886                         m = SCTP_BUF_NEXT(m);
 7887                 }
 7888                 return (outchain);
 7889         } else {
 7890                 /* save off the end and update the end-chain postion */
 7891                 m = appendchain;
 7892                 while (m) {
 7893                         if (SCTP_BUF_NEXT(m) == NULL) {
 7894                                 *endofchain = m;
 7895                                 break;
 7896                         }
 7897                         m = SCTP_BUF_NEXT(m);
 7898                 }
 7899                 return (appendchain);
 7900         }
 7901 }
 7902 
 7903 int
 7904 sctp_med_chunk_output(struct sctp_inpcb *inp,
 7905     struct sctp_tcb *stcb,
 7906     struct sctp_association *asoc,
 7907     int *num_out,
 7908     int *reason_code,
 7909     int control_only, int *cwnd_full, int from_where,
 7910     struct timeval *now, int *now_filled, int frag_point, int so_locked
 7911 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7912     SCTP_UNUSED
 7913 #endif
 7914 );
 7915 
 7916 static void
 7917 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 7918     uint32_t val)
 7919 {
 7920         struct sctp_copy_all *ca;
 7921         struct mbuf *m;
 7922         int ret = 0;
 7923         int added_control = 0;
 7924         int un_sent, do_chunk_output = 1;
 7925         struct sctp_association *asoc;
 7926 
 7927         ca = (struct sctp_copy_all *)ptr;
 7928         if (ca->m == NULL) {
 7929                 return;
 7930         }
 7931         if (ca->inp != inp) {
 7932                 /* TSNH */
 7933                 return;
 7934         }
 7935         if ((ca->m) && ca->sndlen) {
 7936                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
 7937                 if (m == NULL) {
 7938                         /* can't copy so we are done */
 7939                         ca->cnt_failed++;
 7940                         return;
 7941                 }
 7942 #ifdef SCTP_MBUF_LOGGING
 7943                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7944                         struct mbuf *mat;
 7945 
 7946                         mat = m;
 7947                         while (mat) {
 7948                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
 7949                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 7950                                 }
 7951                                 mat = SCTP_BUF_NEXT(mat);
 7952                         }
 7953                 }
 7954 #endif
 7955         } else {
 7956                 m = NULL;
 7957         }
 7958         SCTP_TCB_LOCK_ASSERT(stcb);
 7959         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 7960                 /* Abort this assoc with m as the user defined reason */
 7961                 if (m) {
 7962                         struct sctp_paramhdr *ph;
 7963 
 7964                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
 7965                         if (m) {
 7966                                 ph = mtod(m, struct sctp_paramhdr *);
 7967                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 7968                                 ph->param_length = htons(ca->sndlen);
 7969                         }
 7970                         /*
 7971                          * We add one here to keep the assoc from
 7972                          * dis-appearing on us.
 7973                          */
 7974                         atomic_add_int(&stcb->asoc.refcnt, 1);
 7975                         sctp_abort_an_association(inp, stcb,
 7976                             SCTP_RESPONSE_TO_USER_REQ,
 7977                             m, SCTP_SO_NOT_LOCKED);
 7978                         /*
 7979                          * sctp_abort_an_association calls sctp_free_asoc()
 7980                          * free association will NOT free it since we
 7981                          * incremented the refcnt .. we do this to prevent
 7982                          * it being freed and things getting tricky since we
 7983                          * could end up (from free_asoc) calling inpcb_free
 7984                          * which would get a recursive lock call to the
 7985                          * iterator lock.. But as a consequence of that the
 7986                          * stcb will return to us un-locked.. since
 7987                          * free_asoc returns with either no TCB or the TCB
 7988                          * unlocked, we must relock.. to unlock in the
 7989                          * iterator timer :-0
 7990                          */
 7991                         SCTP_TCB_LOCK(stcb);
 7992                         atomic_add_int(&stcb->asoc.refcnt, -1);
 7993                         goto no_chunk_output;
 7994                 }
 7995         } else {
 7996                 if (m) {
 7997                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
 7998                             &ca->sndrcv, 1);
 7999                 }
 8000                 asoc = &stcb->asoc;
 8001                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 8002                         /* shutdown this assoc */
 8003                         int cnt;
 8004 
 8005                         cnt = sctp_is_there_unsent_data(stcb);
 8006 
 8007                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 8008                             TAILQ_EMPTY(&asoc->sent_queue) &&
 8009                             (cnt == 0)) {
 8010                                 if (asoc->locked_on_sending) {
 8011                                         goto abort_anyway;
 8012                                 }
 8013                                 /*
 8014                                  * there is nothing queued to send, so I'm
 8015                                  * done...
 8016                                  */
 8017                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 8018                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 8019                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 8020                                         /*
 8021                                          * only send SHUTDOWN the first time
 8022                                          * through
 8023                                          */
 8024                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
 8025                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 8026                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 8027                                         }
 8028                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 8029                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 8030                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 8031                                             asoc->primary_destination);
 8032                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 8033                                             asoc->primary_destination);
 8034                                         added_control = 1;
 8035                                         do_chunk_output = 0;
 8036                                 }
 8037                         } else {
 8038                                 /*
 8039                                  * we still got (or just got) data to send,
 8040                                  * so set SHUTDOWN_PENDING
 8041                                  */
 8042                                 /*
 8043                                  * XXX sockets draft says that SCTP_EOF
 8044                                  * should be sent with no data.  currently,
 8045                                  * we will allow user data to be sent first
 8046                                  * and move to SHUTDOWN-PENDING
 8047                                  */
 8048                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 8049                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 8050                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 8051                                         if (asoc->locked_on_sending) {
 8052                                                 /*
 8053                                                  * Locked to send out the
 8054                                                  * data
 8055                                                  */
 8056                                                 struct sctp_stream_queue_pending *sp;
 8057 
 8058                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
 8059                                                 if (sp) {
 8060                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
 8061                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 8062                                                 }
 8063                                         }
 8064                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
 8065                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 8066                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 8067                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 8068                                 abort_anyway:
 8069                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 8070                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 8071                                                     SCTP_RESPONSE_TO_USER_REQ,
 8072                                                     NULL, SCTP_SO_NOT_LOCKED);
 8073                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 8074                                                 goto no_chunk_output;
 8075                                         }
 8076                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 8077                                             asoc->primary_destination);
 8078                                 }
 8079                         }
 8080 
 8081                 }
 8082         }
 8083         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 8084             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
 8085 
 8086         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 8087             (stcb->asoc.total_flight > 0) &&
 8088             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
 8089             ) {
 8090                 do_chunk_output = 0;
 8091         }
 8092         if (do_chunk_output)
 8093                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 8094         else if (added_control) {
 8095                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
 8096                 struct timeval now;
 8097                 int frag_point;
 8098 
 8099                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 8100                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 8101                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
 8102         }
 8103 no_chunk_output:
 8104         if (ret) {
 8105                 ca->cnt_failed++;
 8106         } else {
 8107                 ca->cnt_sent++;
 8108         }
 8109 }
 8110 
 8111 static void
 8112 sctp_sendall_completes(void *ptr, uint32_t val)
 8113 {
 8114         struct sctp_copy_all *ca;
 8115 
 8116         ca = (struct sctp_copy_all *)ptr;
 8117         /*
 8118          * Do a notify here? Kacheong suggests that the notify be done at
 8119          * the send time.. so you would push up a notification if any send
 8120          * failed. Don't know if this is feasable since the only failures we
 8121          * have is "memory" related and if you cannot get an mbuf to send
 8122          * the data you surely can't get an mbuf to send up to notify the
 8123          * user you can't send the data :->
 8124          */
 8125 
 8126         /* now free everything */
 8127         sctp_m_freem(ca->m);
 8128         SCTP_FREE(ca, SCTP_M_COPYAL);
 8129 }
 8130 
 8131 
 8132 #define MC_ALIGN(m, len) do {                                           \
 8133         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
 8134 } while (0)
 8135 
 8136 
 8137 
 8138 static struct mbuf *
 8139 sctp_copy_out_all(struct uio *uio, int len)
 8140 {
 8141         struct mbuf *ret, *at;
 8142         int left, willcpy, cancpy, error;
 8143 
 8144         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
 8145         if (ret == NULL) {
 8146                 /* TSNH */
 8147                 return (NULL);
 8148         }
 8149         left = len;
 8150         SCTP_BUF_LEN(ret) = 0;
 8151         /* save space for the data chunk header */
 8152         cancpy = M_TRAILINGSPACE(ret);
 8153         willcpy = min(cancpy, left);
 8154         at = ret;
 8155         while (left > 0) {
 8156                 /* Align data to the end */
 8157                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
 8158                 if (error) {
 8159         err_out_now:
 8160                         sctp_m_freem(at);
 8161                         return (NULL);
 8162                 }
 8163                 SCTP_BUF_LEN(at) = willcpy;
 8164                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 8165                 left -= willcpy;
 8166                 if (left > 0) {
 8167                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
 8168                         if (SCTP_BUF_NEXT(at) == NULL) {
 8169                                 goto err_out_now;
 8170                         }
 8171                         at = SCTP_BUF_NEXT(at);
 8172                         SCTP_BUF_LEN(at) = 0;
 8173                         cancpy = M_TRAILINGSPACE(at);
 8174                         willcpy = min(cancpy, left);
 8175                 }
 8176         }
 8177         return (ret);
 8178 }
 8179 
 8180 static int
 8181 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 8182     struct sctp_sndrcvinfo *srcv)
 8183 {
 8184         int ret;
 8185         struct sctp_copy_all *ca;
 8186 
 8187         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 8188             SCTP_M_COPYAL);
 8189         if (ca == NULL) {
 8190                 sctp_m_freem(m);
 8191                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8192                 return (ENOMEM);
 8193         }
 8194         memset(ca, 0, sizeof(struct sctp_copy_all));
 8195 
 8196         ca->inp = inp;
 8197         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 8198         /*
 8199          * take off the sendall flag, it would be bad if we failed to do
 8200          * this :-0
 8201          */
 8202         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 8203         /* get length and mbuf chain */
 8204         if (uio) {
 8205                 ca->sndlen = uio->uio_resid;
 8206                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 8207                 if (ca->m == NULL) {
 8208                         SCTP_FREE(ca, SCTP_M_COPYAL);
 8209                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8210                         return (ENOMEM);
 8211                 }
 8212         } else {
 8213                 /* Gather the length of the send */
 8214                 struct mbuf *mat;
 8215 
 8216                 mat = m;
 8217                 ca->sndlen = 0;
 8218                 while (m) {
 8219                         ca->sndlen += SCTP_BUF_LEN(m);
 8220                         m = SCTP_BUF_NEXT(m);
 8221                 }
 8222                 ca->m = mat;
 8223         }
 8224         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 8225             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 8226             SCTP_ASOC_ANY_STATE,
 8227             (void *)ca, 0,
 8228             sctp_sendall_completes, inp, 1);
 8229         if (ret) {
 8230                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
 8231                 SCTP_FREE(ca, SCTP_M_COPYAL);
 8232                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 8233                 return (EFAULT);
 8234         }
 8235         return (0);
 8236 }
 8237 
 8238 
 8239 void
 8240 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 8241 {
 8242         struct sctp_tmit_chunk *chk, *nchk;
 8243 
 8244         chk = TAILQ_FIRST(&asoc->control_send_queue);
 8245         while (chk) {
 8246                 nchk = TAILQ_NEXT(chk, sctp_next);
 8247                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8248                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 8249                         if (chk->data) {
 8250                                 sctp_m_freem(chk->data);
 8251                                 chk->data = NULL;
 8252                         }
 8253                         asoc->ctrl_queue_cnt--;
 8254                         sctp_free_a_chunk(stcb, chk);
 8255                 }
 8256                 chk = nchk;
 8257         }
 8258 }
 8259 
 8260 void
 8261 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 8262 {
 8263         struct sctp_association *asoc;
 8264         struct sctp_tmit_chunk *chk, *chk_tmp;
 8265         struct sctp_asconf_chunk *acp;
 8266 
 8267         asoc = &stcb->asoc;
 8268         for (chk = TAILQ_FIRST(&asoc->asconf_send_queue); chk != NULL;
 8269             chk = chk_tmp) {
 8270                 /* get next chk */
 8271                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
 8272                 /* find SCTP_ASCONF chunk in queue */
 8273                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 8274                         if (chk->data) {
 8275                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
 8276                                 if (compare_with_wrap(ntohl(acp->serial_number), stcb->asoc.asconf_seq_out_acked, MAX_SEQ)) {
 8277                                         /* Not Acked yet */
 8278                                         break;
 8279                                 }
 8280                         }
 8281                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
 8282                         if (chk->data) {
 8283                                 sctp_m_freem(chk->data);
 8284                                 chk->data = NULL;
 8285                         }
 8286                         asoc->ctrl_queue_cnt--;
 8287                         sctp_free_a_chunk(stcb, chk);
 8288                 }
 8289         }
 8290 }
 8291 
 8292 
 8293 static void
 8294 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 8295 
 8296     struct sctp_association *asoc,
 8297     struct sctp_tmit_chunk **data_list,
 8298     int bundle_at,
 8299     struct sctp_nets *net)
 8300 {
 8301         int i;
 8302         struct sctp_tmit_chunk *tp1;
 8303 
 8304         for (i = 0; i < bundle_at; i++) {
 8305                 /* off of the send queue */
 8306                 if (i) {
 8307                         /*
 8308                          * Any chunk NOT 0 you zap the time chunk 0 gets
 8309                          * zapped or set based on if a RTO measurment is
 8310                          * needed.
 8311                          */
 8312                         data_list[i]->do_rtt = 0;
 8313                 }
 8314                 /* record time */
 8315                 data_list[i]->sent_rcv_time = net->last_sent_time;
 8316                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
 8317                 TAILQ_REMOVE(&asoc->send_queue,
 8318                     data_list[i],
 8319                     sctp_next);
 8320                 /* on to the sent queue */
 8321                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 8322                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
 8323                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
 8324                         struct sctp_tmit_chunk *tpp;
 8325 
 8326                         /* need to move back */
 8327         back_up_more:
 8328                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 8329                         if (tpp == NULL) {
 8330                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 8331                                 goto all_done;
 8332                         }
 8333                         tp1 = tpp;
 8334                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
 8335                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
 8336                                 goto back_up_more;
 8337                         }
 8338                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 8339                 } else {
 8340                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 8341                             data_list[i],
 8342                             sctp_next);
 8343                 }
 8344 all_done:
 8345                 /* This does not lower until the cum-ack passes it */
 8346                 asoc->sent_queue_cnt++;
 8347                 asoc->send_queue_cnt--;
 8348                 if ((asoc->peers_rwnd <= 0) &&
 8349                     (asoc->total_flight == 0) &&
 8350                     (bundle_at == 1)) {
 8351                         /* Mark the chunk as being a window probe */
 8352                         SCTP_STAT_INCR(sctps_windowprobed);
 8353                 }
 8354 #ifdef SCTP_AUDITING_ENABLED
 8355                 sctp_audit_log(0xC2, 3);
 8356 #endif
 8357                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 8358                 data_list[i]->snd_count = 1;
 8359                 data_list[i]->rec.data.chunk_was_revoked = 0;
 8360                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 8361                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 8362                             data_list[i]->whoTo->flight_size,
 8363                             data_list[i]->book_size,
 8364                             (uintptr_t) data_list[i]->whoTo,
 8365                             data_list[i]->rec.data.TSN_seq);
 8366                 }
 8367                 sctp_flight_size_increase(data_list[i]);
 8368                 sctp_total_flight_increase(stcb, data_list[i]);
 8369                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 8370                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 8371                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 8372                 }
 8373                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 8374                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 8375                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 8376                         /* SWS sender side engages */
 8377                         asoc->peers_rwnd = 0;
 8378                 }
 8379         }
 8380 }
 8381 
 8382 static void
 8383 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
 8384 {
 8385         struct sctp_tmit_chunk *chk, *nchk;
 8386 
 8387         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
 8388             chk; chk = nchk) {
 8389                 nchk = TAILQ_NEXT(chk, sctp_next);
 8390                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8391                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 8392                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 8393                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 8394                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 8395                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 8396                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 8397                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 8398                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 8399                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 8400                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 8401                         /* Stray chunks must be cleaned up */
 8402         clean_up_anyway:
 8403                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 8404                         if (chk->data) {
 8405                                 sctp_m_freem(chk->data);
 8406                                 chk->data = NULL;
 8407                         }
 8408                         asoc->ctrl_queue_cnt--;
 8409                         sctp_free_a_chunk(stcb, chk);
 8410                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 8411                         /* special handling, we must look into the param */
 8412                         if (chk != asoc->str_reset) {
 8413                                 goto clean_up_anyway;
 8414                         }
 8415                 }
 8416         }
 8417 }
 8418 
 8419 
 8420 static int
 8421 sctp_can_we_split_this(struct sctp_tcb *stcb,
 8422     uint32_t length,
 8423     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
 8424 {
 8425         /*
 8426          * Make a decision on if I should split a msg into multiple parts.
 8427          * This is only asked of incomplete messages.
 8428          */
 8429         if (eeor_on) {
 8430                 /*
 8431                  * If we are doing EEOR we need to always send it if its the
 8432                  * entire thing, since it might be all the guy is putting in
 8433                  * the hopper.
 8434                  */
 8435                 if (goal_mtu >= length) {
 8436                         /*-
 8437                          * If we have data outstanding,
 8438                          * we get another chance when the sack
 8439                          * arrives to transmit - wait for more data
 8440                          */
 8441                         if (stcb->asoc.total_flight == 0) {
 8442                                 /*
 8443                                  * If nothing is in flight, we zero the
 8444                                  * packet counter.
 8445                                  */
 8446                                 return (length);
 8447                         }
 8448                         return (0);
 8449 
 8450                 } else {
 8451                         /* You can fill the rest */
 8452                         return (goal_mtu);
 8453                 }
 8454         }
 8455         /*-
 8456          * For those strange folk that make the send buffer
 8457          * smaller than our fragmentation point, we can't
 8458          * get a full msg in so we have to allow splitting.
 8459          */
 8460         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 8461                 return (length);
 8462         }
 8463         if ((length <= goal_mtu) ||
 8464             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
 8465                 /* Sub-optimial residual don't split in non-eeor mode. */
 8466                 return (0);
 8467         }
 8468         /*
 8469          * If we reach here length is larger than the goal_mtu. Do we wish
 8470          * to split it for the sake of packet putting together?
 8471          */
 8472         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
 8473                 /* Its ok to split it */
 8474                 return (min(goal_mtu, frag_point));
 8475         }
 8476         /* Nope, can't split */
 8477         return (0);
 8478 
 8479 }
 8480 
 8481 static uint32_t
 8482 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
 8483     struct sctp_stream_out *strq,
 8484     uint32_t goal_mtu,
 8485     uint32_t frag_point,
 8486     int *locked,
 8487     int *giveup,
 8488     int eeor_mode,
 8489     int *bail)
 8490 {
 8491         /* Move from the stream to the send_queue keeping track of the total */
 8492         struct sctp_association *asoc;
 8493         struct sctp_stream_queue_pending *sp;
 8494         struct sctp_tmit_chunk *chk;
 8495         struct sctp_data_chunk *dchkh;
 8496         uint32_t to_move, length;
 8497         uint8_t rcv_flags = 0;
 8498         uint8_t some_taken;
 8499         uint8_t send_lock_up = 0;
 8500 
 8501         SCTP_TCB_LOCK_ASSERT(stcb);
 8502         asoc = &stcb->asoc;
 8503 one_more_time:
 8504         /* sa_ignore FREED_MEMORY */
 8505         sp = TAILQ_FIRST(&strq->outqueue);
 8506         if (sp == NULL) {
 8507                 *locked = 0;
 8508                 if (send_lock_up == 0) {
 8509                         SCTP_TCB_SEND_LOCK(stcb);
 8510                         send_lock_up = 1;
 8511                 }
 8512                 sp = TAILQ_FIRST(&strq->outqueue);
 8513                 if (sp) {
 8514                         goto one_more_time;
 8515                 }
 8516                 if (strq->last_msg_incomplete) {
 8517                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 8518                             strq->stream_no,
 8519                             strq->last_msg_incomplete);
 8520                         strq->last_msg_incomplete = 0;
 8521                 }
 8522                 to_move = 0;
 8523                 if (send_lock_up) {
 8524                         SCTP_TCB_SEND_UNLOCK(stcb);
 8525                         send_lock_up = 0;
 8526                 }
 8527                 goto out_of;
 8528         }
 8529         if ((sp->msg_is_complete) && (sp->length == 0)) {
 8530                 if (sp->sender_all_done) {
 8531                         /*
 8532                          * We are doing differed cleanup. Last time through
 8533                          * when we took all the data the sender_all_done was
 8534                          * not set.
 8535                          */
 8536                         if (sp->put_last_out == 0) {
 8537                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 8538                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 8539                                     sp->sender_all_done,
 8540                                     sp->length,
 8541                                     sp->msg_is_complete,
 8542                                     sp->put_last_out,
 8543                                     send_lock_up);
 8544                         }
 8545                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
 8546                                 SCTP_TCB_SEND_LOCK(stcb);
 8547                                 send_lock_up = 1;
 8548                         }
 8549                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 8550                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 8551                         sctp_free_remote_addr(sp->net);
 8552                         if (sp->data) {
 8553                                 sctp_m_freem(sp->data);
 8554                                 sp->data = NULL;
 8555                         }
 8556                         sctp_free_a_strmoq(stcb, sp);
 8557 
 8558                         /* we can't be locked to it */
 8559                         *locked = 0;
 8560                         stcb->asoc.locked_on_sending = NULL;
 8561                         if (send_lock_up) {
 8562                                 SCTP_TCB_SEND_UNLOCK(stcb);
 8563                                 send_lock_up = 0;
 8564                         }
 8565                         /* back to get the next msg */
 8566                         goto one_more_time;
 8567                 } else {
 8568                         /*
 8569                          * sender just finished this but still holds a
 8570                          * reference
 8571                          */
 8572                         *locked = 1;
 8573                         *giveup = 1;
 8574                         to_move = 0;
 8575                         goto out_of;
 8576                 }
 8577         } else {
 8578                 /* is there some to get */
 8579                 if (sp->length == 0) {
 8580                         /* no */
 8581                         *locked = 1;
 8582                         *giveup = 1;
 8583                         to_move = 0;
 8584                         goto out_of;
 8585                 }
 8586         }
 8587         some_taken = sp->some_taken;
 8588         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 8589                 sp->msg_is_complete = 1;
 8590         }
 8591 re_look:
 8592         length = sp->length;
 8593         if (sp->msg_is_complete) {
 8594                 /* The message is complete */
 8595                 to_move = min(length, frag_point);
 8596                 if (to_move == length) {
 8597                         /* All of it fits in the MTU */
 8598                         if (sp->some_taken) {
 8599                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 8600                                 sp->put_last_out = 1;
 8601                         } else {
 8602                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 8603                                 sp->put_last_out = 1;
 8604                         }
 8605                 } else {
 8606                         /* Not all of it fits, we fragment */
 8607                         if (sp->some_taken == 0) {
 8608                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 8609                         }
 8610                         sp->some_taken = 1;
 8611                 }
 8612         } else {
 8613                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
 8614                     frag_point, eeor_mode);
 8615                 if (to_move) {
 8616                         /*-
 8617                          * We use a snapshot of length in case it
 8618                          * is expanding during the compare.
 8619                          */
 8620                         uint32_t llen;
 8621 
 8622                         llen = length;
 8623                         if (to_move >= llen) {
 8624                                 to_move = llen;
 8625                                 if (send_lock_up == 0) {
 8626                                         /*-
 8627                                          * We are taking all of an incomplete msg
 8628                                          * thus we need a send lock.
 8629                                          */
 8630                                         SCTP_TCB_SEND_LOCK(stcb);
 8631                                         send_lock_up = 1;
 8632                                         if (sp->msg_is_complete) {
 8633                                                 /*
 8634                                                  * the sender finished the
 8635                                                  * msg
 8636                                                  */
 8637                                                 goto re_look;
 8638                                         }
 8639                                 }
 8640                         }
 8641                         if (sp->some_taken == 0) {
 8642                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 8643                                 sp->some_taken = 1;
 8644                         }
 8645                 } else {
 8646                         /* Nothing to take. */
 8647                         if (sp->some_taken) {
 8648                                 *locked = 1;
 8649                         }
 8650                         *giveup = 1;
 8651                         to_move = 0;
 8652                         goto out_of;
 8653                 }
 8654         }
 8655 
 8656         /* If we reach here, we can copy out a chunk */
 8657         sctp_alloc_a_chunk(stcb, chk);
 8658         if (chk == NULL) {
 8659                 /* No chunk memory */
 8660                 *giveup = 1;
 8661                 to_move = 0;
 8662                 goto out_of;
 8663         }
 8664         /*
 8665          * Setup for unordered if needed by looking at the user sent info
 8666          * flags.
 8667          */
 8668         if (sp->sinfo_flags & SCTP_UNORDERED) {
 8669                 rcv_flags |= SCTP_DATA_UNORDERED;
 8670         }
 8671         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
 8672             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
 8673                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 8674         }
 8675         /* clear out the chunk before setting up */
 8676         memset(chk, 0, sizeof(*chk));
 8677         chk->rec.data.rcv_flags = rcv_flags;
 8678 
 8679         if (to_move >= length) {
 8680                 /* we think we can steal the whole thing */
 8681                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
 8682                         SCTP_TCB_SEND_LOCK(stcb);
 8683                         send_lock_up = 1;
 8684                 }
 8685                 if (to_move < sp->length) {
 8686                         /* bail, it changed */
 8687                         goto dont_do_it;
 8688                 }
 8689                 chk->data = sp->data;
 8690                 chk->last_mbuf = sp->tail_mbuf;
 8691                 /* register the stealing */
 8692                 sp->data = sp->tail_mbuf = NULL;
 8693         } else {
 8694                 struct mbuf *m;
 8695 
 8696 dont_do_it:
 8697                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
 8698                 chk->last_mbuf = NULL;
 8699                 if (chk->data == NULL) {
 8700                         sp->some_taken = some_taken;
 8701                         sctp_free_a_chunk(stcb, chk);
 8702                         *bail = 1;
 8703                         to_move = 0;
 8704                         goto out_of;
 8705                 }
 8706 #ifdef SCTP_MBUF_LOGGING
 8707                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 8708                         struct mbuf *mat;
 8709 
 8710                         mat = chk->data;
 8711                         while (mat) {
 8712                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
 8713                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
 8714                                 }
 8715                                 mat = SCTP_BUF_NEXT(mat);
 8716                         }
 8717                 }
 8718 #endif
 8719                 /* Pull off the data */
 8720                 m_adj(sp->data, to_move);
 8721                 /* Now lets work our way down and compact it */
 8722                 m = sp->data;
 8723                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 8724                         sp->data = SCTP_BUF_NEXT(m);
 8725                         SCTP_BUF_NEXT(m) = NULL;
 8726                         if (sp->tail_mbuf == m) {
 8727                                 /*-
 8728                                  * Freeing tail? TSNH since
 8729                                  * we supposedly were taking less
 8730                                  * than the sp->length.
 8731                                  */
 8732 #ifdef INVARIANTS
 8733                                 panic("Huh, freing tail? - TSNH");
 8734 #else
 8735                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 8736                                 sp->tail_mbuf = sp->data = NULL;
 8737                                 sp->length = 0;
 8738 #endif
 8739 
 8740                         }
 8741                         sctp_m_free(m);
 8742                         m = sp->data;
 8743                 }
 8744         }
 8745         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 8746                 chk->copy_by_ref = 1;
 8747         } else {
 8748                 chk->copy_by_ref = 0;
 8749         }
 8750         /*
 8751          * get last_mbuf and counts of mb useage This is ugly but hopefully
 8752          * its only one mbuf.
 8753          */
 8754         if (chk->last_mbuf == NULL) {
 8755                 chk->last_mbuf = chk->data;
 8756                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 8757                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 8758                 }
 8759         }
 8760         if (to_move > length) {
 8761                 /*- This should not happen either
 8762                  * since we always lower to_move to the size
 8763                  * of sp->length if its larger.
 8764                  */
 8765 #ifdef INVARIANTS
 8766                 panic("Huh, how can to_move be larger?");
 8767 #else
 8768                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 8769                 sp->length = 0;
 8770 #endif
 8771         } else {
 8772                 atomic_subtract_int(&sp->length, to_move);
 8773         }
 8774         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
 8775                 /* Not enough room for a chunk header, get some */
 8776                 struct mbuf *m;
 8777 
 8778                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
 8779                 if (m == NULL) {
 8780                         /*
 8781                          * we're in trouble here. _PREPEND below will free
 8782                          * all the data if there is no leading space, so we
 8783                          * must put the data back and restore.
 8784                          */
 8785                         if (send_lock_up == 0) {
 8786                                 SCTP_TCB_SEND_LOCK(stcb);
 8787                                 send_lock_up = 1;
 8788                         }
 8789                         if (chk->data == NULL) {
 8790                                 /* unsteal the data */
 8791                                 sp->data = chk->data;
 8792                                 sp->tail_mbuf = chk->last_mbuf;
 8793                         } else {
 8794                                 struct mbuf *m_tmp;
 8795 
 8796                                 /* reassemble the data */
 8797                                 m_tmp = sp->data;
 8798                                 sp->data = chk->data;
 8799                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 8800                         }
 8801                         sp->some_taken = some_taken;
 8802                         atomic_add_int(&sp->length, to_move);
 8803                         chk->data = NULL;
 8804                         *bail = 1;
 8805                         sctp_free_a_chunk(stcb, chk);
 8806                         to_move = 0;
 8807                         goto out_of;
 8808                 } else {
 8809                         SCTP_BUF_LEN(m) = 0;
 8810                         SCTP_BUF_NEXT(m) = chk->data;
 8811                         chk->data = m;
 8812                         M_ALIGN(chk->data, 4);
 8813                 }
 8814         }
 8815         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
 8816         if (chk->data == NULL) {
 8817                 /* HELP, TSNH since we assured it would not above? */
 8818 #ifdef INVARIANTS
 8819                 panic("prepend failes HELP?");
 8820 #else
 8821                 SCTP_PRINTF("prepend fails HELP?\n");
 8822                 sctp_free_a_chunk(stcb, chk);
 8823 #endif
 8824                 *bail = 1;
 8825                 to_move = 0;
 8826                 goto out_of;
 8827         }
 8828         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
 8829         chk->book_size = chk->send_size = (to_move +
 8830             sizeof(struct sctp_data_chunk));
 8831         chk->book_size_scale = 0;
 8832         chk->sent = SCTP_DATAGRAM_UNSENT;
 8833 
 8834         chk->flags = 0;
 8835         chk->asoc = &stcb->asoc;
 8836         chk->pad_inplace = 0;
 8837         chk->no_fr_allowed = 0;
 8838         chk->rec.data.stream_seq = sp->strseq;
 8839         chk->rec.data.stream_number = sp->stream;
 8840         chk->rec.data.payloadtype = sp->ppid;
 8841         chk->rec.data.context = sp->context;
 8842         chk->rec.data.doing_fast_retransmit = 0;
 8843         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
 8844 
 8845         chk->rec.data.timetodrop = sp->ts;
 8846         chk->flags = sp->act_flags;
 8847         chk->addr_over = sp->addr_over;
 8848 
 8849         chk->whoTo = net;
 8850         atomic_add_int(&chk->whoTo->ref_count, 1);
 8851 
 8852         if (sp->holds_key_ref) {
 8853                 chk->auth_keyid = sp->auth_keyid;
 8854                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
 8855                 chk->holds_key_ref = 1;
 8856         }
 8857         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
 8858         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
 8859                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 8860                     (uintptr_t) stcb, sp->length,
 8861                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
 8862                     chk->rec.data.TSN_seq);
 8863         }
 8864         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 8865         /*
 8866          * Put the rest of the things in place now. Size was done earlier in
 8867          * previous loop prior to padding.
 8868          */
 8869 
 8870 #ifdef SCTP_ASOCLOG_OF_TSNS
 8871         SCTP_TCB_LOCK_ASSERT(stcb);
 8872         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 8873                 asoc->tsn_out_at = 0;
 8874                 asoc->tsn_out_wrapped = 1;
 8875         }
 8876         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
 8877         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
 8878         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
 8879         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 8880         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 8881         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 8882         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 8883         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 8884         asoc->tsn_out_at++;
 8885 #endif
 8886 
 8887         dchkh->ch.chunk_type = SCTP_DATA;
 8888         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 8889         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
 8890         dchkh->dp.stream_id = htons(strq->stream_no);
 8891         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
 8892         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
 8893         dchkh->ch.chunk_length = htons(chk->send_size);
 8894         /* Now advance the chk->send_size by the actual pad needed. */
 8895         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 8896                 /* need a pad */
 8897                 struct mbuf *lm;
 8898                 int pads;
 8899 
 8900                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 8901                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
 8902                         chk->pad_inplace = 1;
 8903                 }
 8904                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
 8905                         /* pad added an mbuf */
 8906                         chk->last_mbuf = lm;
 8907                 }
 8908                 chk->send_size += pads;
 8909         }
 8910         /* We only re-set the policy if it is on */
 8911         if (sp->pr_sctp_on) {
 8912                 sctp_set_prsctp_policy(stcb, sp);
 8913                 asoc->pr_sctp_cnt++;
 8914                 chk->pr_sctp_on = 1;
 8915         } else {
 8916                 chk->pr_sctp_on = 0;
 8917         }
 8918         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 8919                 /* All done pull and kill the message */
 8920                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 8921                 if (sp->put_last_out == 0) {
 8922                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 8923                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 8924                             sp->sender_all_done,
 8925                             sp->length,
 8926                             sp->msg_is_complete,
 8927                             sp->put_last_out,
 8928                             send_lock_up);
 8929                 }
 8930                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
 8931                         SCTP_TCB_SEND_LOCK(stcb);
 8932                         send_lock_up = 1;
 8933                 }
 8934                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 8935                 sctp_free_remote_addr(sp->net);
 8936                 if (sp->data) {
 8937                         sctp_m_freem(sp->data);
 8938                         sp->data = NULL;
 8939                 }
 8940                 sctp_free_a_strmoq(stcb, sp);
 8941 
 8942                 /* we can't be locked to it */
 8943                 *locked = 0;
 8944                 stcb->asoc.locked_on_sending = NULL;
 8945         } else {
 8946                 /* more to go, we are locked */
 8947                 *locked = 1;
 8948         }
 8949         asoc->chunks_on_out_queue++;
 8950         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 8951         asoc->send_queue_cnt++;
 8952 out_of:
 8953         if (send_lock_up) {
 8954                 SCTP_TCB_SEND_UNLOCK(stcb);
 8955                 send_lock_up = 0;
 8956         }
 8957         return (to_move);
 8958 }
 8959 
 8960 
 8961 static struct sctp_stream_out *
 8962 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
 8963 {
 8964         struct sctp_stream_out *strq;
 8965 
 8966         /* Find the next stream to use */
 8967         if (asoc->last_out_stream == NULL) {
 8968                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
 8969                 if (asoc->last_out_stream == NULL) {
 8970                         /* huh nothing on the wheel, TSNH */
 8971                         return (NULL);
 8972                 }
 8973                 goto done_it;
 8974         }
 8975         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
 8976 done_it:
 8977         if (strq == NULL) {
 8978                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
 8979         }
 8980         /* Save off the last stream */
 8981         asoc->last_out_stream = strq;
 8982         return (strq);
 8983 
 8984 }
 8985 
 8986 
 8987 static void
 8988 sctp_fill_outqueue(struct sctp_tcb *stcb,
 8989     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
 8990 {
 8991         struct sctp_association *asoc;
 8992         struct sctp_stream_out *strq, *strqn, *strqt;
 8993         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
 8994         int locked, giveup;
 8995         struct sctp_stream_queue_pending *sp;
 8996 
 8997         SCTP_TCB_LOCK_ASSERT(stcb);
 8998         asoc = &stcb->asoc;
 8999 #ifdef INET6
 9000         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
 9001                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9002         } else {
 9003                 /* ?? not sure what else to do */
 9004                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 9005         }
 9006 #else
 9007         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9008 #endif
 9009         /* Need an allowance for the data chunk header too */
 9010         goal_mtu -= sizeof(struct sctp_data_chunk);
 9011 
 9012         /* must make even word boundary */
 9013         goal_mtu &= 0xfffffffc;
 9014         if (asoc->locked_on_sending) {
 9015                 /* We are stuck on one stream until the message completes. */
 9016                 strqn = strq = asoc->locked_on_sending;
 9017                 locked = 1;
 9018         } else {
 9019                 strqn = strq = sctp_select_a_stream(stcb, asoc);
 9020                 locked = 0;
 9021         }
 9022 
 9023         while ((goal_mtu > 0) && strq) {
 9024                 sp = TAILQ_FIRST(&strq->outqueue);
 9025                 /*
 9026                  * If CMT is off, we must validate that the stream in
 9027                  * question has the first item pointed towards are network
 9028                  * destionation requested by the caller. Note that if we
 9029                  * turn out to be locked to a stream (assigning TSN's then
 9030                  * we must stop, since we cannot look for another stream
 9031                  * with data to send to that destination). In CMT's case, by
 9032                  * skipping this check, we will send one data packet towards
 9033                  * the requested net.
 9034                  */
 9035                 if (sp == NULL) {
 9036                         break;
 9037                 }
 9038                 if ((sp->net != net) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
 9039                         /* none for this network */
 9040                         if (locked) {
 9041                                 break;
 9042                         } else {
 9043                                 strq = sctp_select_a_stream(stcb, asoc);
 9044                                 if (strq == NULL)
 9045                                         /* none left */
 9046                                         break;
 9047                                 if (strqn == strq) {
 9048                                         /* I have circled */
 9049                                         break;
 9050                                 }
 9051                                 continue;
 9052                         }
 9053                 }
 9054                 giveup = 0;
 9055                 bail = 0;
 9056                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
 9057                     &giveup, eeor_mode, &bail);
 9058                 asoc->last_out_stream = strq;
 9059                 if (locked) {
 9060                         asoc->locked_on_sending = strq;
 9061                         if ((moved_how_much == 0) || (giveup) || bail)
 9062                                 /* no more to move for now */
 9063                                 break;
 9064                 } else {
 9065                         asoc->locked_on_sending = NULL;
 9066                         strqt = sctp_select_a_stream(stcb, asoc);
 9067                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
 9068                                 if (strq == strqn) {
 9069                                         /* Must move start to next one */
 9070                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
 9071                                         if (strqn == NULL) {
 9072                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
 9073                                                 if (strqn == NULL) {
 9074                                                         break;
 9075                                                 }
 9076                                         }
 9077                                 }
 9078                                 sctp_remove_from_wheel(stcb, asoc, strq);
 9079                         }
 9080                         if ((giveup) || bail) {
 9081                                 break;
 9082                         }
 9083                         strq = strqt;
 9084                         if (strq == NULL) {
 9085                                 break;
 9086                         }
 9087                 }
 9088                 total_moved += moved_how_much;
 9089                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
 9090                 goal_mtu &= 0xfffffffc;
 9091         }
 9092         if (bail)
 9093                 *quit_now = 1;
 9094 
 9095         if (total_moved == 0) {
 9096                 if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) &&
 9097                     (net == stcb->asoc.primary_destination)) {
 9098                         /* ran dry for primary network net */
 9099                         SCTP_STAT_INCR(sctps_primary_randry);
 9100                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
 9101                         /* ran dry with CMT on */
 9102                         SCTP_STAT_INCR(sctps_cmt_randry);
 9103                 }
 9104         }
 9105 }
 9106 
 9107 void
 9108 sctp_fix_ecn_echo(struct sctp_association *asoc)
 9109 {
 9110         struct sctp_tmit_chunk *chk;
 9111 
 9112         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9113                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 9114                         chk->sent = SCTP_DATAGRAM_UNSENT;
 9115                 }
 9116         }
 9117 }
 9118 
 9119 static void
 9120 sctp_move_to_an_alt(struct sctp_tcb *stcb,
 9121     struct sctp_association *asoc,
 9122     struct sctp_nets *net)
 9123 {
 9124         struct sctp_tmit_chunk *chk;
 9125         struct sctp_nets *a_net;
 9126 
 9127         SCTP_TCB_LOCK_ASSERT(stcb);
 9128         /*
 9129          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
 9130          * destination using the PF algorithm for finding alternate
 9131          * destinations.
 9132          */
 9133         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) {
 9134                 a_net = sctp_find_alternate_net(stcb, net, 2);
 9135         } else {
 9136                 a_net = sctp_find_alternate_net(stcb, net, 0);
 9137         }
 9138         if ((a_net != net) &&
 9139             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
 9140                 /*
 9141                  * We only proceed if a valid alternate is found that is not
 9142                  * this one and is reachable. Here we must move all chunks
 9143                  * queued in the send queue off of the destination address
 9144                  * to our alternate.
 9145                  */
 9146                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 9147                         if (chk->whoTo == net) {
 9148                                 /* Move the chunk to our alternate */
 9149                                 sctp_free_remote_addr(chk->whoTo);
 9150                                 chk->whoTo = a_net;
 9151                                 atomic_add_int(&a_net->ref_count, 1);
 9152                         }
 9153                 }
 9154         }
 9155 }
 9156 
 9157 int
 9158 sctp_med_chunk_output(struct sctp_inpcb *inp,
 9159     struct sctp_tcb *stcb,
 9160     struct sctp_association *asoc,
 9161     int *num_out,
 9162     int *reason_code,
 9163     int control_only, int *cwnd_full, int from_where,
 9164     struct timeval *now, int *now_filled, int frag_point, int so_locked
 9165 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9166     SCTP_UNUSED
 9167 #endif
 9168 )
 9169 {
 9170         /*
 9171          * Ok this is the generic chunk service queue. we must do the
 9172          * following: - Service the stream queue that is next, moving any
 9173          * message (note I must get a complete message i.e. FIRST/MIDDLE and
 9174          * LAST to the out queue in one pass) and assigning TSN's - Check to
 9175          * see if the cwnd/rwnd allows any output, if so we go ahead and
 9176          * fomulate and send the low level chunks. Making sure to combine
 9177          * any control in the control chunk queue also.
 9178          */
 9179         struct sctp_nets *net;
 9180         struct mbuf *outchain, *endoutchain;
 9181         struct sctp_tmit_chunk *chk, *nchk;
 9182         struct sctphdr *shdr;
 9183 
 9184         /* temp arrays for unlinking */
 9185         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 9186         int no_fragmentflg, error;
 9187         int one_chunk, hbflag, skip_data_for_this_net;
 9188         int asconf, cookie, no_out_cnt;
 9189         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
 9190         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 9191         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
 9192         int tsns_sent = 0;
 9193         uint32_t auth_offset = 0;
 9194         struct sctp_auth_chunk *auth = NULL;
 9195         uint16_t auth_keyid = 0;
 9196         int data_auth_reqd = 0;
 9197 
 9198         /*
 9199          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 9200          * destination.
 9201          */
 9202         int pf_hbflag = 0;
 9203         int quit_now = 0;
 9204 
 9205         *num_out = 0;
 9206         cwnd_full_ind = 0;
 9207 
 9208         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 9209             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
 9210             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 9211                 eeor_mode = 1;
 9212         } else {
 9213                 eeor_mode = 0;
 9214         }
 9215         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 9216         /*
 9217          * First lets prime the pump. For each destination, if there is room
 9218          * in the flight size, attempt to pull an MTU's worth out of the
 9219          * stream queues into the general send_queue
 9220          */
 9221 #ifdef SCTP_AUDITING_ENABLED
 9222         sctp_audit_log(0xC2, 2);
 9223 #endif
 9224         SCTP_TCB_LOCK_ASSERT(stcb);
 9225         hbflag = 0;
 9226         if ((control_only) || (asoc->stream_reset_outstanding))
 9227                 no_data_chunks = 1;
 9228         else
 9229                 no_data_chunks = 0;
 9230 
 9231         /* Nothing to possible to send? */
 9232         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 9233             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 9234             TAILQ_EMPTY(&asoc->send_queue) &&
 9235             TAILQ_EMPTY(&asoc->out_wheel)) {
 9236                 *reason_code = 9;
 9237                 return (0);
 9238         }
 9239         if (asoc->peers_rwnd == 0) {
 9240                 /* No room in peers rwnd */
 9241                 *cwnd_full = 1;
 9242                 *reason_code = 1;
 9243                 if (asoc->total_flight > 0) {
 9244                         /* we are allowed one chunk in flight */
 9245                         no_data_chunks = 1;
 9246                 }
 9247         }
 9248         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
 9249                 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) {
 9250                         /*
 9251                          * for CMT we start at the next one past the one we
 9252                          * last added data to.
 9253                          */
 9254                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
 9255                                 goto skip_the_fill_from_streams;
 9256                         }
 9257                         if (asoc->last_net_data_came_from) {
 9258                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
 9259                                 if (net == NULL) {
 9260                                         net = TAILQ_FIRST(&asoc->nets);
 9261                                 }
 9262                         } else {
 9263                                 /* back to start */
 9264                                 net = TAILQ_FIRST(&asoc->nets);
 9265                         }
 9266 
 9267                         /*
 9268                          * JRI-TODO: CMT-MPI. Simply set the first
 9269                          * destination (net) to be optimized for the next
 9270                          * message to be pulled out of the outwheel. 1. peek
 9271                          * at outwheel 2. If large message, set net =
 9272                          * highest_cwnd 3. If small message, set net =
 9273                          * lowest rtt
 9274                          */
 9275                 } else {
 9276                         net = asoc->primary_destination;
 9277                         if (net == NULL) {
 9278                                 /* TSNH */
 9279                                 net = TAILQ_FIRST(&asoc->nets);
 9280                         }
 9281                 }
 9282                 start_at = net;
 9283 
 9284 one_more_time:
 9285                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 9286                         net->window_probe = 0;
 9287                         if (old_startat && (old_startat == net)) {
 9288                                 break;
 9289                         }
 9290                         /*
 9291                          * JRI: if dest is unreachable or unconfirmed, do
 9292                          * not send data to it
 9293                          */
 9294                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 9295                                 continue;
 9296                         }
 9297                         /*
 9298                          * JRI: if dest is in PF state, do not send data to
 9299                          * it
 9300                          */
 9301                         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
 9302                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
 9303                             (net->dest_state & SCTP_ADDR_PF)) {
 9304                                 continue;
 9305                         }
 9306                         if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0) && (net->ref_count < 2)) {
 9307                                 /* nothing can be in queue for this guy */
 9308                                 continue;
 9309                         }
 9310                         if (net->flight_size >= net->cwnd) {
 9311                                 /* skip this network, no room */
 9312                                 cwnd_full_ind++;
 9313                                 continue;
 9314                         }
 9315                         /*
 9316                          * JRI : this for loop we are in takes in each net,
 9317                          * if its's got space in cwnd and has data sent to
 9318                          * it (when CMT is off) then it calls
 9319                          * sctp_fill_outqueue for the net. This gets data on
 9320                          * the send queue for that network.
 9321                          * 
 9322                          * In sctp_fill_outqueue TSN's are assigned and data is
 9323                          * copied out of the stream buffers. Note mostly
 9324                          * copy by reference (we hope).
 9325                          */
 9326                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 9327                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 9328                         }
 9329                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
 9330                         if (quit_now) {
 9331                                 /* memory alloc failure */
 9332                                 no_data_chunks = 1;
 9333                                 goto skip_the_fill_from_streams;
 9334                         }
 9335                 }
 9336                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
 9337                         /* got to pick up the beginning stuff. */
 9338                         old_startat = start_at;
 9339                         start_at = net = TAILQ_FIRST(&asoc->nets);
 9340                         if (old_startat)
 9341                                 goto one_more_time;
 9342                 }
 9343         }
 9344 skip_the_fill_from_streams:
 9345         *cwnd_full = cwnd_full_ind;
 9346 
 9347         /* now service each destination and send out what we can for it */
 9348         /* Nothing to send? */
 9349         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
 9350             (TAILQ_FIRST(&asoc->asconf_send_queue) == NULL) &&
 9351             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
 9352                 *reason_code = 8;
 9353                 return (0);
 9354         }
 9355         if (no_data_chunks) {
 9356                 chk = TAILQ_FIRST(&asoc->asconf_send_queue);
 9357                 if (chk == NULL)
 9358                         chk = TAILQ_FIRST(&asoc->control_send_queue);
 9359         } else {
 9360                 chk = TAILQ_FIRST(&asoc->send_queue);
 9361         }
 9362         if (chk) {
 9363                 send_start_at = chk->whoTo;
 9364         } else {
 9365                 send_start_at = TAILQ_FIRST(&asoc->nets);
 9366         }
 9367         old_startat = NULL;
 9368 again_one_more_time:
 9369         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 9370                 /* how much can we send? */
 9371                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 9372                 if (old_startat && (old_startat == net)) {
 9373                         /* through list ocmpletely. */
 9374                         break;
 9375                 }
 9376                 tsns_sent = 0;
 9377                 if (net->ref_count < 2) {
 9378                         /*
 9379                          * Ref-count of 1 so we cannot have data or control
 9380                          * queued to this address. Skip it.
 9381                          */
 9382                         continue;
 9383                 }
 9384                 ctl_cnt = bundle_at = 0;
 9385                 endoutchain = outchain = NULL;
 9386                 no_fragmentflg = 1;
 9387                 one_chunk = 0;
 9388                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 9389                         skip_data_for_this_net = 1;
 9390                 } else {
 9391                         skip_data_for_this_net = 0;
 9392                 }
 9393                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
 9394                         /*
 9395                          * if we have a route and an ifp check to see if we
 9396                          * have room to send to this guy
 9397                          */
 9398                         struct ifnet *ifp;
 9399 
 9400                         ifp = net->ro.ro_rt->rt_ifp;
 9401                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
 9402                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
 9403                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
 9404                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
 9405                                 }
 9406                                 continue;
 9407                         }
 9408                 }
 9409                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 9410                 case AF_INET:
 9411                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
 9412                         break;
 9413 #ifdef INET6
 9414                 case AF_INET6:
 9415                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
 9416                         break;
 9417 #endif
 9418                 default:
 9419                         /* TSNH */
 9420                         mtu = net->mtu;
 9421                         break;
 9422                 }
 9423                 mx_mtu = mtu;
 9424                 to_out = 0;
 9425                 if (mtu > asoc->peers_rwnd) {
 9426                         if (asoc->total_flight > 0) {
 9427                                 /* We have a packet in flight somewhere */
 9428                                 r_mtu = asoc->peers_rwnd;
 9429                         } else {
 9430                                 /* We are always allowed to send one MTU out */
 9431                                 one_chunk = 1;
 9432                                 r_mtu = mtu;
 9433                         }
 9434                 } else {
 9435                         r_mtu = mtu;
 9436                 }
 9437                 /************************/
 9438                 /* ASCONF transmission */
 9439                 /************************/
 9440                 /* Now first lets go through the asconf queue */
 9441                 for (chk = TAILQ_FIRST(&asoc->asconf_send_queue);
 9442                     chk; chk = nchk) {
 9443                         nchk = TAILQ_NEXT(chk, sctp_next);
 9444                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
 9445                                 continue;
 9446                         }
 9447                         if (chk->whoTo != net) {
 9448                                 /*
 9449                                  * No, not sent to the network we are
 9450                                  * looking at
 9451                                  */
 9452                                 break;
 9453                         }
 9454                         if (chk->data == NULL) {
 9455                                 break;
 9456                         }
 9457                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
 9458                             chk->sent != SCTP_DATAGRAM_RESEND) {
 9459                                 break;
 9460                         }
 9461                         /*
 9462                          * if no AUTH is yet included and this chunk
 9463                          * requires it, make sure to account for it.  We
 9464                          * don't apply the size until the AUTH chunk is
 9465                          * actually added below in case there is no room for
 9466                          * this chunk. NOTE: we overload the use of "omtu"
 9467                          * here
 9468                          */
 9469                         if ((auth == NULL) &&
 9470                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9471                             stcb->asoc.peer_auth_chunks)) {
 9472                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9473                         } else
 9474                                 omtu = 0;
 9475                         /* Here we do NOT factor the r_mtu */
 9476                         if ((chk->send_size < (int)(mtu - omtu)) ||
 9477                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9478                                 /*
 9479                                  * We probably should glom the mbuf chain
 9480                                  * from the chk->data for control but the
 9481                                  * problem is it becomes yet one more level
 9482                                  * of tracking to do if for some reason
 9483                                  * output fails. Then I have got to
 9484                                  * reconstruct the merged control chain.. el
 9485                                  * yucko.. for now we take the easy way and
 9486                                  * do the copy
 9487                                  */
 9488                                 /*
 9489                                  * Add an AUTH chunk, if chunk requires it
 9490                                  * save the offset into the chain for AUTH
 9491                                  */
 9492                                 if ((auth == NULL) &&
 9493                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9494                                     stcb->asoc.peer_auth_chunks))) {
 9495                                         outchain = sctp_add_auth_chunk(outchain,
 9496                                             &endoutchain,
 9497                                             &auth,
 9498                                             &auth_offset,
 9499                                             stcb,
 9500                                             chk->rec.chunk_id.id);
 9501                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9502                                 }
 9503                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 9504                                     (int)chk->rec.chunk_id.can_take_data,
 9505                                     chk->send_size, chk->copy_by_ref);
 9506                                 if (outchain == NULL) {
 9507                                         *reason_code = 8;
 9508                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9509                                         return (ENOMEM);
 9510                                 }
 9511                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9512                                 /* update our MTU size */
 9513                                 if (mtu > (chk->send_size + omtu))
 9514                                         mtu -= (chk->send_size + omtu);
 9515                                 else
 9516                                         mtu = 0;
 9517                                 to_out += (chk->send_size + omtu);
 9518                                 /* Do clear IP_DF ? */
 9519                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9520                                         no_fragmentflg = 0;
 9521                                 }
 9522                                 if (chk->rec.chunk_id.can_take_data)
 9523                                         chk->data = NULL;
 9524                                 /*
 9525                                  * set hb flag since we can use these for
 9526                                  * RTO
 9527                                  */
 9528                                 hbflag = 1;
 9529                                 asconf = 1;
 9530                                 /*
 9531                                  * should sysctl this: don't bundle data
 9532                                  * with ASCONF since it requires AUTH
 9533                                  */
 9534                                 no_data_chunks = 1;
 9535                                 chk->sent = SCTP_DATAGRAM_SENT;
 9536                                 chk->snd_count++;
 9537                                 if (mtu == 0) {
 9538                                         /*
 9539                                          * Ok we are out of room but we can
 9540                                          * output without effecting the
 9541                                          * flight size since this little guy
 9542                                          * is a control only packet.
 9543                                          */
 9544                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 9545                                         /*
 9546                                          * do NOT clear the asconf flag as
 9547                                          * it is used to do appropriate
 9548                                          * source address selection.
 9549                                          */
 9550                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
 9551                                         if (outchain == NULL) {
 9552                                                 /* no memory */
 9553                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 9554                                                 error = ENOBUFS;
 9555                                                 *reason_code = 7;
 9556                                                 continue;
 9557                                         }
 9558                                         shdr = mtod(outchain, struct sctphdr *);
 9559                                         shdr->src_port = inp->sctp_lport;
 9560                                         shdr->dest_port = stcb->rport;
 9561                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 9562                                         shdr->checksum = 0;
 9563                                         auth_offset += sizeof(struct sctphdr);
 9564                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9565                                             (struct sockaddr *)&net->ro._l_addr,
 9566                                             outchain, auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9567                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
 9568                                                 if (error == ENOBUFS) {
 9569                                                         asoc->ifp_had_enobuf = 1;
 9570                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9571                                                 }
 9572                                                 if (from_where == 0) {
 9573                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 9574                                                 }
 9575                                                 if (*now_filled == 0) {
 9576                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 9577                                                         *now_filled = 1;
 9578                                                         *now = net->last_sent_time;
 9579                                                 } else {
 9580                                                         net->last_sent_time = *now;
 9581                                                 }
 9582                                                 hbflag = 0;
 9583                                                 /* error, could not output */
 9584                                                 if (error == EHOSTUNREACH) {
 9585                                                         /*
 9586                                                          * Destination went
 9587                                                          * unreachable
 9588                                                          * during this send
 9589                                                          */
 9590                                                         sctp_move_to_an_alt(stcb, asoc, net);
 9591                                                 }
 9592                                                 *reason_code = 7;
 9593                                                 continue;
 9594                                         } else
 9595                                                 asoc->ifp_had_enobuf = 0;
 9596                                         if (*now_filled == 0) {
 9597                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 9598                                                 *now_filled = 1;
 9599                                                 *now = net->last_sent_time;
 9600                                         } else {
 9601                                                 net->last_sent_time = *now;
 9602                                         }
 9603                                         hbflag = 0;
 9604                                         /*
 9605                                          * increase the number we sent, if a
 9606                                          * cookie is sent we don't tell them
 9607                                          * any was sent out.
 9608                                          */
 9609                                         outchain = endoutchain = NULL;
 9610                                         auth = NULL;
 9611                                         auth_offset = 0;
 9612                                         if (!no_out_cnt)
 9613                                                 *num_out += ctl_cnt;
 9614                                         /* recalc a clean slate and setup */
 9615                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 9616                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
 9617                                         } else {
 9618                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
 9619                                         }
 9620                                         to_out = 0;
 9621                                         no_fragmentflg = 1;
 9622                                 }
 9623                         }
 9624                 }
 9625                 /************************/
 9626                 /* Control transmission */
 9627                 /************************/
 9628                 /* Now first lets go through the control queue */
 9629                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
 9630                     chk; chk = nchk) {
 9631                         nchk = TAILQ_NEXT(chk, sctp_next);
 9632                         if (chk->whoTo != net) {
 9633                                 /*
 9634                                  * No, not sent to the network we are
 9635                                  * looking at
 9636                                  */
 9637                                 continue;
 9638                         }
 9639                         if (chk->data == NULL) {
 9640                                 continue;
 9641                         }
 9642                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 9643                                 /*
 9644                                  * It must be unsent. Cookies and ASCONF's
 9645                                  * hang around but there timers will force
 9646                                  * when marked for resend.
 9647                                  */
 9648                                 continue;
 9649                         }
 9650                         /*
 9651                          * if no AUTH is yet included and this chunk
 9652                          * requires it, make sure to account for it.  We
 9653                          * don't apply the size until the AUTH chunk is
 9654                          * actually added below in case there is no room for
 9655                          * this chunk. NOTE: we overload the use of "omtu"
 9656                          * here
 9657                          */
 9658                         if ((auth == NULL) &&
 9659                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9660                             stcb->asoc.peer_auth_chunks)) {
 9661                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9662                         } else
 9663                                 omtu = 0;
 9664                         /* Here we do NOT factor the r_mtu */
 9665                         if ((chk->send_size < (int)(mtu - omtu)) ||
 9666                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9667                                 /*
 9668                                  * We probably should glom the mbuf chain
 9669                                  * from the chk->data for control but the
 9670                                  * problem is it becomes yet one more level
 9671                                  * of tracking to do if for some reason
 9672                                  * output fails. Then I have got to
 9673                                  * reconstruct the merged control chain.. el
 9674                                  * yucko.. for now we take the easy way and
 9675                                  * do the copy
 9676                                  */
 9677                                 /*
 9678                                  * Add an AUTH chunk, if chunk requires it
 9679                                  * save the offset into the chain for AUTH
 9680                                  */
 9681                                 if ((auth == NULL) &&
 9682                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9683                                     stcb->asoc.peer_auth_chunks))) {
 9684                                         outchain = sctp_add_auth_chunk(outchain,
 9685                                             &endoutchain,
 9686                                             &auth,
 9687                                             &auth_offset,
 9688                                             stcb,
 9689                                             chk->rec.chunk_id.id);
 9690                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9691                                 }
 9692                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 9693                                     (int)chk->rec.chunk_id.can_take_data,
 9694                                     chk->send_size, chk->copy_by_ref);
 9695                                 if (outchain == NULL) {
 9696                                         *reason_code = 8;
 9697                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9698                                         return (ENOMEM);
 9699                                 }
 9700                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9701                                 /* update our MTU size */
 9702                                 if (mtu > (chk->send_size + omtu))
 9703                                         mtu -= (chk->send_size + omtu);
 9704                                 else
 9705                                         mtu = 0;
 9706                                 to_out += (chk->send_size + omtu);
 9707                                 /* Do clear IP_DF ? */
 9708                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9709                                         no_fragmentflg = 0;
 9710                                 }
 9711                                 if (chk->rec.chunk_id.can_take_data)
 9712                                         chk->data = NULL;
 9713                                 /* Mark things to be removed, if needed */
 9714                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 9715                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 9716                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 9717                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 9718                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 9719                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 9720                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 9721                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 9722                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 9723                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 9724                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 9725 
 9726                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 9727                                                 hbflag = 1;
 9728                                                 /*
 9729                                                  * JRS 5/14/07 - Set the
 9730                                                  * flag to say a heartbeat
 9731                                                  * is being sent.
 9732                                                  */
 9733                                                 pf_hbflag = 1;
 9734                                         }
 9735                                         /* remove these chunks at the end */
 9736                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
 9737                                                 /* turn off the timer */
 9738                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 9739                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 9740                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 9741                                                 }
 9742                                         }
 9743                                         /*
 9744                                          * EY -Nr-sack version of the above
 9745                                          * if statement
 9746                                          */
 9747                                         if ((SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) &&
 9748                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {  /* EY !?! */
 9749                                                 /* turn off the timer */
 9750                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 9751                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 9752                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 9753                                                 }
 9754                                         }
 9755                                         ctl_cnt++;
 9756                                 } else {
 9757                                         /*
 9758                                          * Other chunks, since they have
 9759                                          * timers running (i.e. COOKIE) we
 9760                                          * just "trust" that it gets sent or
 9761                                          * retransmitted.
 9762                                          */
 9763                                         ctl_cnt++;
 9764                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 9765                                                 cookie = 1;
 9766                                                 no_out_cnt = 1;
 9767                                         }
 9768                                         chk->sent = SCTP_DATAGRAM_SENT;
 9769                                         chk->snd_count++;
 9770                                 }
 9771                                 if (mtu == 0) {
 9772                                         /*
 9773                                          * Ok we are out of room but we can
 9774                                          * output without effecting the
 9775                                          * flight size since this little guy
 9776                                          * is a control only packet.
 9777                                          */
 9778                                         if (asconf) {
 9779                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 9780                                                 /*
 9781                                                  * do NOT clear the asconf
 9782                                                  * flag as it is used to do
 9783                                                  * appropriate source
 9784                                                  * address selection.
 9785                                                  */
 9786                                         }
 9787                                         if (cookie) {
 9788                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 9789                                                 cookie = 0;
 9790                                         }
 9791                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
 9792                                         if (outchain == NULL) {
 9793                                                 /* no memory */
 9794                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 9795                                                 error = ENOBUFS;
 9796                                                 goto error_out_again;
 9797                                         }
 9798                                         shdr = mtod(outchain, struct sctphdr *);
 9799                                         shdr->src_port = inp->sctp_lport;
 9800                                         shdr->dest_port = stcb->rport;
 9801                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 9802                                         shdr->checksum = 0;
 9803                                         auth_offset += sizeof(struct sctphdr);
 9804                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9805                                             (struct sockaddr *)&net->ro._l_addr,
 9806                                             outchain,
 9807                                             auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9808                                             no_fragmentflg, 0, NULL, asconf, net->port, so_locked, NULL))) {
 9809                                                 if (error == ENOBUFS) {
 9810                                                         asoc->ifp_had_enobuf = 1;
 9811                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9812                                                 }
 9813                                                 if (from_where == 0) {
 9814                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 9815                                                 }
 9816                                 error_out_again:
 9817                                                 /* error, could not output */
 9818                                                 if (hbflag) {
 9819                                                         if (*now_filled == 0) {
 9820                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 9821                                                                 *now_filled = 1;
 9822                                                                 *now = net->last_sent_time;
 9823                                                         } else {
 9824                                                                 net->last_sent_time = *now;
 9825                                                         }
 9826                                                         hbflag = 0;
 9827                                                 }
 9828                                                 if (error == EHOSTUNREACH) {
 9829                                                         /*
 9830                                                          * Destination went
 9831                                                          * unreachable
 9832                                                          * during this send
 9833                                                          */
 9834                                                         sctp_move_to_an_alt(stcb, asoc, net);
 9835                                                 }
 9836                                                 *reason_code = 7;
 9837                                                 continue;
 9838                                         } else
 9839                                                 asoc->ifp_had_enobuf = 0;
 9840                                         /* Only HB or ASCONF advances time */
 9841                                         if (hbflag) {
 9842                                                 if (*now_filled == 0) {
 9843                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 9844                                                         *now_filled = 1;
 9845                                                         *now = net->last_sent_time;
 9846                                                 } else {
 9847                                                         net->last_sent_time = *now;
 9848                                                 }
 9849                                                 hbflag = 0;
 9850                                         }
 9851                                         /*
 9852                                          * increase the number we sent, if a
 9853                                          * cookie is sent we don't tell them
 9854                                          * any was sent out.
 9855                                          */
 9856                                         outchain = endoutchain = NULL;
 9857                                         auth = NULL;
 9858                                         auth_offset = 0;
 9859                                         if (!no_out_cnt)
 9860                                                 *num_out += ctl_cnt;
 9861                                         /* recalc a clean slate and setup */
 9862                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 9863                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
 9864                                         } else {
 9865                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
 9866                                         }
 9867                                         to_out = 0;
 9868                                         no_fragmentflg = 1;
 9869                                 }
 9870                         }
 9871                 }
 9872                 /*********************/
 9873                 /* Data transmission */
 9874                 /*********************/
 9875                 /*
 9876                  * if AUTH for DATA is required and no AUTH has been added
 9877                  * yet, account for this in the mtu now... if no data can be
 9878                  * bundled, this adjustment won't matter anyways since the
 9879                  * packet will be going out...
 9880                  */
 9881                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
 9882                     stcb->asoc.peer_auth_chunks);
 9883                 if (data_auth_reqd && (auth == NULL)) {
 9884                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9885                 }
 9886                 /* now lets add any data within the MTU constraints */
 9887                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 9888                 case AF_INET:
 9889                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
 9890                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
 9891                         else
 9892                                 omtu = 0;
 9893                         break;
 9894 #ifdef INET6
 9895                 case AF_INET6:
 9896                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
 9897                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
 9898                         else
 9899                                 omtu = 0;
 9900                         break;
 9901 #endif
 9902                 default:
 9903                         /* TSNH */
 9904                         omtu = 0;
 9905                         break;
 9906                 }
 9907                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
 9908                     (cookie)) {
 9909                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
 9910                                 if (no_data_chunks) {
 9911                                         /* let only control go out */
 9912                                         *reason_code = 1;
 9913                                         break;
 9914                                 }
 9915                                 if (net->flight_size >= net->cwnd) {
 9916                                         /* skip this net, no room for data */
 9917                                         *reason_code = 2;
 9918                                         break;
 9919                                 }
 9920                                 nchk = TAILQ_NEXT(chk, sctp_next);
 9921                                 if (chk->whoTo != net) {
 9922                                         /* No, not sent to this net */
 9923                                         continue;
 9924                                 }
 9925                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 9926                                         /*-
 9927                                          * strange, we have a chunk that is
 9928                                          * to big for its destination and
 9929                                          * yet no fragment ok flag.
 9930                                          * Something went wrong when the
 9931                                          * PMTU changed...we did not mark
 9932                                          * this chunk for some reason?? I
 9933                                          * will fix it here by letting IP
 9934                                          * fragment it for now and printing
 9935                                          * a warning. This really should not
 9936                                          * happen ...
 9937                                          */
 9938                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 9939                                             chk->send_size, mtu);
 9940                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 9941                                 }
 9942                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 9943                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 9944                                         /* ok we will add this one */
 9945 
 9946                                         /*
 9947                                          * Add an AUTH chunk, if chunk
 9948                                          * requires it, save the offset into
 9949                                          * the chain for AUTH
 9950                                          */
 9951                                         if (data_auth_reqd) {
 9952                                                 if (auth == NULL) {
 9953                                                         outchain = sctp_add_auth_chunk(outchain,
 9954                                                             &endoutchain,
 9955                                                             &auth,
 9956                                                             &auth_offset,
 9957                                                             stcb,
 9958                                                             SCTP_DATA);
 9959                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9960                                                         auth_keyid = chk->auth_keyid;
 9961                                                 } else if (auth_keyid != chk->auth_keyid) {
 9962                                                         /*
 9963                                                          * different keyid,
 9964                                                          * so done bundling
 9965                                                          */
 9966                                                         break;
 9967                                                 }
 9968                                         }
 9969                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 9970                                             chk->send_size, chk->copy_by_ref);
 9971                                         if (outchain == NULL) {
 9972                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 9973                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9974                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9975                                                 }
 9976                                                 *reason_code = 3;
 9977                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9978                                                 return (ENOMEM);
 9979                                         }
 9980                                         /* upate our MTU size */
 9981                                         /* Do clear IP_DF ? */
 9982                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9983                                                 no_fragmentflg = 0;
 9984                                         }
 9985                                         /* unsigned subtraction of mtu */
 9986                                         if (mtu > chk->send_size)
 9987                                                 mtu -= chk->send_size;
 9988                                         else
 9989                                                 mtu = 0;
 9990                                         /* unsigned subtraction of r_mtu */
 9991                                         if (r_mtu > chk->send_size)
 9992                                                 r_mtu -= chk->send_size;
 9993                                         else
 9994                                                 r_mtu = 0;
 9995 
 9996                                         to_out += chk->send_size;
 9997                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 9998 #ifdef INVARIANTS
 9999                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
10000 #else
10001                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
10002                                                     mx_mtu, to_out);
10003 #endif
10004                                         }
10005                                         chk->window_probe = 0;
10006                                         data_list[bundle_at++] = chk;
10007                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
10008                                                 mtu = 0;
10009                                                 break;
10010                                         }
10011                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
10012                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
10013                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
10014                                                 } else {
10015                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
10016                                                 }
10017                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
10018                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
10019                                                         /*
10020                                                          * Count number of
10021                                                          * user msg's that
10022                                                          * were fragmented
10023                                                          * we do this by
10024                                                          * counting when we
10025                                                          * see a LAST
10026                                                          * fragment only.
10027                                                          */
10028                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
10029                                         }
10030                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
10031                                                 if (one_chunk) {
10032                                                         data_list[0]->window_probe = 1;
10033                                                         net->window_probe = 1;
10034                                                 }
10035                                                 break;
10036                                         }
10037                                 } else {
10038                                         /*
10039                                          * Must be sent in order of the
10040                                          * TSN's (on a network)
10041                                          */
10042                                         break;
10043                                 }
10044                         }       /* for (chunk gather loop for this net) */
10045                 }               /* if asoc.state OPEN */
10046                 /* Is there something to send for this destination? */
10047                 if (outchain) {
10048                         /* We may need to start a control timer or two */
10049                         if (asconf) {
10050                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
10051                                     stcb, net);
10052                                 /*
10053                                  * do NOT clear the asconf flag as it is
10054                                  * used to do appropriate source address
10055                                  * selection.
10056                                  */
10057                         }
10058                         if (cookie) {
10059                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
10060                                 cookie = 0;
10061                         }
10062                         /* must start a send timer if data is being sent */
10063                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
10064                                 /*
10065                                  * no timer running on this destination
10066                                  * restart it.
10067                                  */
10068                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
10069                         } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
10070                                     SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
10071                                     pf_hbflag &&
10072                                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) &&
10073                             (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
10074                                 /*
10075                                  * JRS 5/14/07 - If a HB has been sent to a
10076                                  * PF destination and no T3 timer is
10077                                  * currently running, start the T3 timer to
10078                                  * track the HBs that were sent.
10079                                  */
10080                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
10081                         }
10082                         /* Now send it, if there is anything to send :> */
10083                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
10084                         if (outchain == NULL) {
10085                                 /* out of mbufs */
10086                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
10087                                 error = ENOBUFS;
10088                                 goto errored_send;
10089                         }
10090                         shdr = mtod(outchain, struct sctphdr *);
10091                         shdr->src_port = inp->sctp_lport;
10092                         shdr->dest_port = stcb->rport;
10093                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
10094                         shdr->checksum = 0;
10095                         auth_offset += sizeof(struct sctphdr);
10096                         /*
10097                          * if data auth isn't needed, use the assoc active
10098                          * key
10099                          */
10100                         if (!data_auth_reqd)
10101                                 auth_keyid = stcb->asoc.authinfo.active_keyid;
10102                         if ((error = sctp_lowlevel_chunk_output(inp,
10103                             stcb,
10104                             net,
10105                             (struct sockaddr *)&net->ro._l_addr,
10106                             outchain,
10107                             auth_offset,
10108                             auth,
10109                             auth_keyid,
10110                             no_fragmentflg,
10111                             bundle_at,
10112                             data_list[0],
10113                             asconf, net->port, so_locked, NULL))) {
10114                                 /* error, we could not output */
10115                                 if (error == ENOBUFS) {
10116                                         SCTP_STAT_INCR(sctps_lowlevelerr);
10117                                         asoc->ifp_had_enobuf = 1;
10118                                 }
10119                                 if (from_where == 0) {
10120                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
10121                                 }
10122                 errored_send:
10123                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10124                                 if (hbflag) {
10125                                         if (*now_filled == 0) {
10126                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
10127                                                 *now_filled = 1;
10128                                                 *now = net->last_sent_time;
10129                                         } else {
10130                                                 net->last_sent_time = *now;
10131                                         }
10132                                         hbflag = 0;
10133                                 }
10134                                 if (error == EHOSTUNREACH) {
10135                                         /*
10136                                          * Destination went unreachable
10137                                          * during this send
10138                                          */
10139                                         sctp_move_to_an_alt(stcb, asoc, net);
10140                                 }
10141                                 *reason_code = 6;
10142                                 /*-
10143                                  * I add this line to be paranoid. As far as
10144                                  * I can tell the continue, takes us back to
10145                                  * the top of the for, but just to make sure
10146                                  * I will reset these again here.
10147                                  */
10148                                 ctl_cnt = bundle_at = 0;
10149                                 continue;       /* This takes us back to the
10150                                                  * for() for the nets. */
10151                         } else {
10152                                 asoc->ifp_had_enobuf = 0;
10153                         }
10154                         outchain = endoutchain = NULL;
10155                         auth = NULL;
10156                         auth_offset = 0;
10157                         if (bundle_at || hbflag) {
10158                                 /* For data/asconf and hb set time */
10159                                 if (*now_filled == 0) {
10160                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
10161                                         *now_filled = 1;
10162                                         *now = net->last_sent_time;
10163                                 } else {
10164                                         net->last_sent_time = *now;
10165                                 }
10166                         }
10167                         if (!no_out_cnt) {
10168                                 *num_out += (ctl_cnt + bundle_at);
10169                         }
10170                         if (bundle_at) {
10171                                 /* setup for a RTO measurement */
10172                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
10173                                 /* fill time if not already filled */
10174                                 if (*now_filled == 0) {
10175                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
10176                                         *now_filled = 1;
10177                                         *now = asoc->time_last_sent;
10178                                 } else {
10179                                         asoc->time_last_sent = *now;
10180                                 }
10181                                 data_list[0]->do_rtt = 1;
10182                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
10183                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
10184                                 if (SCTP_BASE_SYSCTL(sctp_early_fr)) {
10185                                         if (net->flight_size < net->cwnd) {
10186                                                 /* start or restart it */
10187                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
10188                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
10189                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
10190                                                 }
10191                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
10192                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
10193                                         } else {
10194                                                 /* stop it if its running */
10195                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
10196                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
10197                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
10198                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10199                                                 }
10200                                         }
10201                                 }
10202                         }
10203                         if (one_chunk) {
10204                                 break;
10205                         }
10206                 }
10207                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10208                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
10209                 }
10210         }
10211         if (old_startat == NULL) {
10212                 old_startat = send_start_at;
10213                 send_start_at = TAILQ_FIRST(&asoc->nets);
10214                 if (old_startat)
10215                         goto again_one_more_time;
10216         }
10217         /*
10218          * At the end there should be no NON timed chunks hanging on this
10219          * queue.
10220          */
10221         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10222                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
10223         }
10224         if ((*num_out == 0) && (*reason_code == 0)) {
10225                 *reason_code = 4;
10226         } else {
10227                 *reason_code = 5;
10228         }
10229         sctp_clean_up_ctl(stcb, asoc);
10230         return (0);
10231 }
10232 
10233 void
10234 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
10235 {
10236         /*-
10237          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
10238          * the control chunk queue.
10239          */
10240         struct sctp_chunkhdr *hdr;
10241         struct sctp_tmit_chunk *chk;
10242         struct mbuf *mat;
10243 
10244         SCTP_TCB_LOCK_ASSERT(stcb);
10245         sctp_alloc_a_chunk(stcb, chk);
10246         if (chk == NULL) {
10247                 /* no memory */
10248                 sctp_m_freem(op_err);
10249                 return;
10250         }
10251         chk->copy_by_ref = 0;
10252         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
10253         if (op_err == NULL) {
10254                 sctp_free_a_chunk(stcb, chk);
10255                 return;
10256         }
10257         chk->send_size = 0;
10258         mat = op_err;
10259         while (mat != NULL) {
10260                 chk->send_size += SCTP_BUF_LEN(mat);
10261                 mat = SCTP_BUF_NEXT(mat);
10262         }
10263         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
10264         chk->rec.chunk_id.can_take_data = 1;
10265         chk->sent = SCTP_DATAGRAM_UNSENT;
10266         chk->snd_count = 0;
10267         chk->flags = 0;
10268         chk->asoc = &stcb->asoc;
10269         chk->data = op_err;
10270         chk->whoTo = chk->asoc->primary_destination;
10271         atomic_add_int(&chk->whoTo->ref_count, 1);
10272         hdr = mtod(op_err, struct sctp_chunkhdr *);
10273         hdr->chunk_type = SCTP_OPERATION_ERROR;
10274         hdr->chunk_flags = 0;
10275         hdr->chunk_length = htons(chk->send_size);
10276         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
10277             chk,
10278             sctp_next);
10279         chk->asoc->ctrl_queue_cnt++;
10280 }
10281 
10282 int
10283 sctp_send_cookie_echo(struct mbuf *m,
10284     int offset,
10285     struct sctp_tcb *stcb,
10286     struct sctp_nets *net)
10287 {
10288         /*-
10289          * pull out the cookie and put it at the front of the control chunk
10290          * queue.
10291          */
10292         int at;
10293         struct mbuf *cookie;
10294         struct sctp_paramhdr parm, *phdr;
10295         struct sctp_chunkhdr *hdr;
10296         struct sctp_tmit_chunk *chk;
10297         uint16_t ptype, plen;
10298 
10299         /* First find the cookie in the param area */
10300         cookie = NULL;
10301         at = offset + sizeof(struct sctp_init_chunk);
10302 
10303         SCTP_TCB_LOCK_ASSERT(stcb);
10304         do {
10305                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
10306                 if (phdr == NULL) {
10307                         return (-3);
10308                 }
10309                 ptype = ntohs(phdr->param_type);
10310                 plen = ntohs(phdr->param_length);
10311                 if (ptype == SCTP_STATE_COOKIE) {
10312                         int pad;
10313 
10314                         /* found the cookie */
10315                         if ((pad = (plen % 4))) {
10316                                 plen += 4 - pad;
10317                         }
10318                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
10319                         if (cookie == NULL) {
10320                                 /* No memory */
10321                                 return (-2);
10322                         }
10323 #ifdef SCTP_MBUF_LOGGING
10324                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
10325                                 struct mbuf *mat;
10326 
10327                                 mat = cookie;
10328                                 while (mat) {
10329                                         if (SCTP_BUF_IS_EXTENDED(mat)) {
10330                                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
10331                                         }
10332                                         mat = SCTP_BUF_NEXT(mat);
10333                                 }
10334                         }
10335 #endif
10336                         break;
10337                 }
10338                 at += SCTP_SIZE32(plen);
10339         } while (phdr);
10340         if (cookie == NULL) {
10341                 /* Did not find the cookie */
10342                 return (-3);
10343         }
10344         /* ok, we got the cookie lets change it into a cookie echo chunk */
10345 
10346         /* first the change from param to cookie */
10347         hdr = mtod(cookie, struct sctp_chunkhdr *);
10348         hdr->chunk_type = SCTP_COOKIE_ECHO;
10349         hdr->chunk_flags = 0;
10350         /* get the chunk stuff now and place it in the FRONT of the queue */
10351         sctp_alloc_a_chunk(stcb, chk);
10352         if (chk == NULL) {
10353                 /* no memory */
10354                 sctp_m_freem(cookie);
10355                 return (-5);
10356         }
10357         chk->copy_by_ref = 0;
10358         chk->send_size = plen;
10359         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
10360         chk->rec.chunk_id.can_take_data = 0;
10361         chk->sent = SCTP_DATAGRAM_UNSENT;
10362         chk->snd_count = 0;
10363         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
10364         chk->asoc = &stcb->asoc;
10365         chk->data = cookie;
10366         chk->whoTo = chk->asoc->primary_destination;
10367         atomic_add_int(&chk->whoTo->ref_count, 1);
10368         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
10369         chk->asoc->ctrl_queue_cnt++;
10370         return (0);
10371 }
10372 
10373 void
10374 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
10375     struct mbuf *m,
10376     int offset,
10377     int chk_length,
10378     struct sctp_nets *net)
10379 {
10380         /*
10381          * take a HB request and make it into a HB ack and send it.
10382          */
10383         struct mbuf *outchain;
10384         struct sctp_chunkhdr *chdr;
10385         struct sctp_tmit_chunk *chk;
10386 
10387 
10388         if (net == NULL)
10389                 /* must have a net pointer */
10390                 return;
10391 
10392         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
10393         if (outchain == NULL) {
10394                 /* gak out of memory */
10395                 return;
10396         }
10397 #ifdef SCTP_MBUF_LOGGING
10398         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
10399                 struct mbuf *mat;
10400 
10401                 mat = outchain;
10402                 while (mat) {
10403                         if (SCTP_BUF_IS_EXTENDED(mat)) {
10404                                 sctp_log_mb(mat, SCTP_MBUF_ICOPY);
10405                         }
10406                         mat = SCTP_BUF_NEXT(mat);
10407                 }
10408         }
10409 #endif
10410         chdr = mtod(outchain, struct sctp_chunkhdr *);
10411         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
10412         chdr->chunk_flags = 0;
10413         if (chk_length % 4) {
10414                 /* need pad */
10415                 uint32_t cpthis = 0;
10416                 int padlen;
10417 
10418                 padlen = 4 - (chk_length % 4);
10419                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
10420         }
10421         sctp_alloc_a_chunk(stcb, chk);
10422         if (chk == NULL) {
10423                 /* no memory */
10424                 sctp_m_freem(outchain);
10425                 return;
10426         }
10427         chk->copy_by_ref = 0;
10428         chk->send_size = chk_length;
10429         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
10430         chk->rec.chunk_id.can_take_data = 1;
10431         chk->sent = SCTP_DATAGRAM_UNSENT;
10432         chk->snd_count = 0;
10433         chk->flags = 0;
10434         chk->asoc = &stcb->asoc;
10435         chk->data = outchain;
10436         chk->whoTo = net;
10437         atomic_add_int(&chk->whoTo->ref_count, 1);
10438         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
10439         chk->asoc->ctrl_queue_cnt++;
10440 }
10441 
10442 void
10443 sctp_send_cookie_ack(struct sctp_tcb *stcb)
10444 {
10445         /* formulate and queue a cookie-ack back to sender */
10446         struct mbuf *cookie_ack;
10447         struct sctp_chunkhdr *hdr;
10448         struct sctp_tmit_chunk *chk;
10449 
10450         cookie_ack = NULL;
10451         SCTP_TCB_LOCK_ASSERT(stcb);
10452 
10453         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
10454         if (cookie_ack == NULL) {
10455                 /* no mbuf's */
10456                 return;
10457         }
10458         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
10459         sctp_alloc_a_chunk(stcb, chk);
10460         if (chk == NULL) {
10461                 /* no memory */
10462                 sctp_m_freem(cookie_ack);
10463                 return;
10464         }
10465         chk->copy_by_ref = 0;
10466         chk->send_size = sizeof(struct sctp_chunkhdr);
10467         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
10468         chk->rec.chunk_id.can_take_data = 1;
10469         chk->sent = SCTP_DATAGRAM_UNSENT;
10470         chk->snd_count = 0;
10471         chk->flags = 0;
10472         chk->asoc = &stcb->asoc;
10473         chk->data = cookie_ack;
10474         if (chk->asoc->last_control_chunk_from != NULL) {
10475                 chk->whoTo = chk->asoc->last_control_chunk_from;
10476         } else {
10477                 chk->whoTo = chk->asoc->primary_destination;
10478         }
10479         atomic_add_int(&chk->whoTo->ref_count, 1);
10480         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
10481         hdr->chunk_type = SCTP_COOKIE_ACK;
10482         hdr->chunk_flags = 0;
10483         hdr->chunk_length = htons(chk->send_size);
10484         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
10485         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
10486         chk->asoc->ctrl_queue_cnt++;
10487         return;
10488 }
10489 
10490 
10491 void
10492 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
10493 {
10494         /* formulate and queue a SHUTDOWN-ACK back to the sender */
10495         struct mbuf *m_shutdown_ack;
10496         struct sctp_shutdown_ack_chunk *ack_cp;
10497         struct sctp_tmit_chunk *chk;
10498 
10499         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10500         if (m_shutdown_ack == NULL) {
10501                 /* no mbuf's */
10502                 return;
10503         }
10504         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
10505         sctp_alloc_a_chunk(stcb, chk);
10506         if (chk == NULL) {
10507                 /* no memory */
10508                 sctp_m_freem(m_shutdown_ack);
10509                 return;
10510         }
10511         chk->copy_by_ref = 0;
10512         chk->send_size = sizeof(struct sctp_chunkhdr);
10513         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
10514         chk->rec.chunk_id.can_take_data = 1;
10515         chk->sent = SCTP_DATAGRAM_UNSENT;
10516         chk->snd_count = 0;
10517         chk->flags = 0;
10518         chk->asoc = &stcb->asoc;
10519         chk->data = m_shutdown_ack;
10520         chk->whoTo = net;
10521         atomic_add_int(&net->ref_count, 1);
10522 
10523         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
10524         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
10525         ack_cp->ch.chunk_flags = 0;
10526         ack_cp->ch.chunk_length = htons(chk->send_size);
10527         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
10528         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
10529         chk->asoc->ctrl_queue_cnt++;
10530         return;
10531 }
10532 
10533 void
10534 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
10535 {
10536         /* formulate and queue a SHUTDOWN to the sender */
10537         struct mbuf *m_shutdown;
10538         struct sctp_shutdown_chunk *shutdown_cp;
10539         struct sctp_tmit_chunk *chk;
10540 
10541         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
10542         if (m_shutdown == NULL) {
10543                 /* no mbuf's */
10544                 return;
10545         }
10546         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
10547         sctp_alloc_a_chunk(stcb, chk);
10548         if (chk == NULL) {
10549                 /* no memory */
10550                 sctp_m_freem(m_shutdown);
10551                 return;
10552         }
10553         chk->copy_by_ref = 0;
10554         chk->send_size = sizeof(struct sctp_shutdown_chunk);
10555         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
10556         chk->rec.chunk_id.can_take_data = 1;
10557         chk->sent = SCTP_DATAGRAM_UNSENT;
10558         chk->snd_count = 0;
10559         chk->flags = 0;
10560         chk->asoc = &stcb->asoc;
10561         chk->data = m_shutdown;
10562         chk->whoTo = net;
10563         atomic_add_int(&net->ref_count, 1);
10564 
10565         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
10566         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
10567         shutdown_cp->ch.chunk_flags = 0;
10568         shutdown_cp->ch.chunk_length = htons(chk->send_size);
10569         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
10570         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
10571         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
10572         chk->asoc->ctrl_queue_cnt++;
10573         return;
10574 }
10575 
10576 void
10577 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
10578 {
10579         /*
10580          * formulate and queue an ASCONF to the peer. ASCONF parameters
10581          * should be queued on the assoc queue.
10582          */
10583         struct sctp_tmit_chunk *chk;
10584         struct mbuf *m_asconf;
10585         int len;
10586 
10587         SCTP_TCB_LOCK_ASSERT(stcb);
10588 
10589         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
10590             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
10591                 /* can't send a new one if there is one in flight already */
10592                 return;
10593         }
10594         /* compose an ASCONF chunk, maximum length is PMTU */
10595         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
10596         if (m_asconf == NULL) {
10597                 return;
10598         }
10599         sctp_alloc_a_chunk(stcb, chk);
10600         if (chk == NULL) {
10601                 /* no memory */
10602                 sctp_m_freem(m_asconf);
10603                 return;
10604         }
10605         chk->copy_by_ref = 0;
10606         chk->data = m_asconf;
10607         chk->send_size = len;
10608         chk->rec.chunk_id.id = SCTP_ASCONF;
10609         chk->rec.chunk_id.can_take_data = 0;
10610         chk->sent = SCTP_DATAGRAM_UNSENT;
10611         chk->snd_count = 0;
10612         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
10613         chk->asoc = &stcb->asoc;
10614         chk->whoTo = net;
10615         atomic_add_int(&chk->whoTo->ref_count, 1);
10616         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
10617         chk->asoc->ctrl_queue_cnt++;
10618         return;
10619 }
10620 
10621 void
10622 sctp_send_asconf_ack(struct sctp_tcb *stcb)
10623 {
10624         /*
10625          * formulate and queue a asconf-ack back to sender. the asconf-ack
10626          * must be stored in the tcb.
10627          */
10628         struct sctp_tmit_chunk *chk;
10629         struct sctp_asconf_ack *ack, *latest_ack;
10630         struct mbuf *m_ack, *m;
10631         struct sctp_nets *net = NULL;
10632 
10633         SCTP_TCB_LOCK_ASSERT(stcb);
10634         /* Get the latest ASCONF-ACK */
10635         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
10636         if (latest_ack == NULL) {
10637                 return;
10638         }
10639         if (latest_ack->last_sent_to != NULL &&
10640             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
10641                 /* we're doing a retransmission */
10642                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
10643                 if (net == NULL) {
10644                         /* no alternate */
10645                         if (stcb->asoc.last_control_chunk_from == NULL)
10646                                 net = stcb->asoc.primary_destination;
10647                         else
10648                                 net = stcb->asoc.last_control_chunk_from;
10649                 }
10650         } else {
10651                 /* normal case */
10652                 if (stcb->asoc.last_control_chunk_from == NULL)
10653                         net = stcb->asoc.primary_destination;
10654                 else
10655                         net = stcb->asoc.last_control_chunk_from;
10656         }
10657         latest_ack->last_sent_to = net;
10658 
10659         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
10660                 if (ack->data == NULL) {
10661                         continue;
10662                 }
10663                 /* copy the asconf_ack */
10664                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
10665                 if (m_ack == NULL) {
10666                         /* couldn't copy it */
10667                         return;
10668                 }
10669 #ifdef SCTP_MBUF_LOGGING
10670                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
10671                         struct mbuf *mat;
10672 
10673                         mat = m_ack;
10674                         while (mat) {
10675                                 if (SCTP_BUF_IS_EXTENDED(mat)) {
10676                                         sctp_log_mb(mat, SCTP_MBUF_ICOPY);
10677                                 }
10678                                 mat = SCTP_BUF_NEXT(mat);
10679                         }
10680                 }
10681 #endif
10682 
10683                 sctp_alloc_a_chunk(stcb, chk);
10684                 if (chk == NULL) {
10685                         /* no memory */
10686                         if (m_ack)
10687                                 sctp_m_freem(m_ack);
10688                         return;
10689                 }
10690                 chk->copy_by_ref = 0;
10691 
10692                 chk->whoTo = net;
10693                 chk->data = m_ack;
10694                 chk->send_size = 0;
10695                 /* Get size */
10696                 m = m_ack;
10697                 chk->send_size = ack->len;
10698                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
10699                 chk->rec.chunk_id.can_take_data = 1;
10700                 chk->sent = SCTP_DATAGRAM_UNSENT;
10701                 chk->snd_count = 0;
10702                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
10703                 chk->asoc = &stcb->asoc;
10704                 atomic_add_int(&chk->whoTo->ref_count, 1);
10705 
10706                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
10707                 chk->asoc->ctrl_queue_cnt++;
10708         }
10709         return;
10710 }
10711 
10712 
10713 static int
10714 sctp_chunk_retransmission(struct sctp_inpcb *inp,
10715     struct sctp_tcb *stcb,
10716     struct sctp_association *asoc,
10717     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
10718 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10719     SCTP_UNUSED
10720 #endif
10721 )
10722 {
10723         /*-
10724          * send out one MTU of retransmission. If fast_retransmit is
10725          * happening we ignore the cwnd. Otherwise we obey the cwnd and
10726          * rwnd. For a Cookie or Asconf in the control chunk queue we
10727          * retransmit them by themselves.
10728          *
10729          * For data chunks we will pick out the lowest TSN's in the sent_queue
10730          * marked for resend and bundle them all together (up to a MTU of
10731          * destination). The address to send to should have been
10732          * selected/changed where the retransmission was marked (i.e. in FR
10733          * or t3-timeout routines).
10734          */
10735         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
10736         struct sctp_tmit_chunk *chk, *fwd;
10737         struct mbuf *m, *endofchain;
10738         struct sctphdr *shdr;
10739         struct sctp_nets *net = NULL;
10740         uint32_t tsns_sent = 0;
10741         int no_fragmentflg, bundle_at, cnt_thru;
10742         unsigned int mtu;
10743         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
10744         struct sctp_auth_chunk *auth = NULL;
10745         uint32_t auth_offset = 0;
10746         uint16_t auth_keyid = 0;
10747         int data_auth_reqd = 0;
10748         uint32_t dmtu = 0;
10749 
10750         SCTP_TCB_LOCK_ASSERT(stcb);
10751         tmr_started = ctl_cnt = bundle_at = error = 0;
10752         no_fragmentflg = 1;
10753         fwd_tsn = 0;
10754         *cnt_out = 0;
10755         fwd = NULL;
10756         endofchain = m = NULL;
10757 #ifdef SCTP_AUDITING_ENABLED
10758         sctp_audit_log(0xC3, 1);
10759 #endif
10760         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
10761             (TAILQ_EMPTY(&asoc->control_send_queue))) {
10762                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
10763                     asoc->sent_queue_retran_cnt);
10764                 asoc->sent_queue_cnt = 0;
10765                 asoc->sent_queue_cnt_removeable = 0;
10766                 /* send back 0/0 so we enter normal transmission */
10767                 *cnt_out = 0;
10768                 return (0);
10769         }
10770         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10771                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
10772                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
10773                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
10774                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
10775                                 if (chk != asoc->str_reset) {
10776                                         /*
10777                                          * not eligible for retran if its
10778                                          * not ours
10779                                          */
10780                                         continue;
10781                                 }
10782                         }
10783                         ctl_cnt++;
10784                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10785                                 fwd_tsn = 1;
10786                                 fwd = chk;
10787                         }
10788                         /*
10789                          * Add an AUTH chunk, if chunk requires it save the
10790                          * offset into the chain for AUTH
10791                          */
10792                         if ((auth == NULL) &&
10793                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
10794                             stcb->asoc.peer_auth_chunks))) {
10795                                 m = sctp_add_auth_chunk(m, &endofchain,
10796                                     &auth, &auth_offset,
10797                                     stcb,
10798                                     chk->rec.chunk_id.id);
10799                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10800                         }
10801                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
10802                         break;
10803                 }
10804         }
10805         one_chunk = 0;
10806         cnt_thru = 0;
10807         /* do we have control chunks to retransmit? */
10808         if (m != NULL) {
10809                 /* Start a timer no matter if we suceed or fail */
10810                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
10811                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
10812                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
10813                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
10814 
10815                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
10816                 if (m == NULL) {
10817                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
10818                         return (ENOBUFS);
10819                 }
10820                 shdr = mtod(m, struct sctphdr *);
10821                 shdr->src_port = inp->sctp_lport;
10822                 shdr->dest_port = stcb->rport;
10823                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
10824                 shdr->checksum = 0;
10825                 auth_offset += sizeof(struct sctphdr);
10826                 chk->snd_count++;       /* update our count */
10827 
10828                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
10829                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
10830                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
10831                     no_fragmentflg, 0, NULL, 0, chk->whoTo->port, so_locked, NULL))) {
10832                         SCTP_STAT_INCR(sctps_lowlevelerr);
10833                         return (error);
10834                 }
10835                 m = endofchain = NULL;
10836                 auth = NULL;
10837                 auth_offset = 0;
10838                 /*
10839                  * We don't want to mark the net->sent time here since this
10840                  * we use this for HB and retrans cannot measure RTT
10841                  */
10842                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
10843                 *cnt_out += 1;
10844                 chk->sent = SCTP_DATAGRAM_SENT;
10845                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
10846                 if (fwd_tsn == 0) {
10847                         return (0);
10848                 } else {
10849                         /* Clean up the fwd-tsn list */
10850                         sctp_clean_up_ctl(stcb, asoc);
10851                         return (0);
10852                 }
10853         }
10854         /*
10855          * Ok, it is just data retransmission we need to do or that and a
10856          * fwd-tsn with it all.
10857          */
10858         if (TAILQ_EMPTY(&asoc->sent_queue)) {
10859                 return (SCTP_RETRAN_DONE);
10860         }
10861         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
10862             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
10863                 /* not yet open, resend the cookie and that is it */
10864                 return (1);
10865         }
10866 #ifdef SCTP_AUDITING_ENABLED
10867         sctp_auditing(20, inp, stcb, NULL);
10868 #endif
10869         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
10870         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
10871                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
10872                         /* No, not sent to this net or not ready for rtx */
10873                         continue;
10874                 }
10875                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
10876                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
10877                         /* Gak, we have exceeded max unlucky retran, abort! */
10878                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
10879                             chk->snd_count,
10880                             SCTP_BASE_SYSCTL(sctp_max_retran_chunk));
10881                         atomic_add_int(&stcb->asoc.refcnt, 1);
10882                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
10883                         SCTP_TCB_LOCK(stcb);
10884                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
10885                         return (SCTP_RETRAN_EXIT);
10886                 }
10887                 /* pick up the net */
10888                 net = chk->whoTo;
10889                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10890                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
10891                 } else {
10892                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
10893                 }
10894 
10895                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
10896                         /* No room in peers rwnd */
10897                         uint32_t tsn;
10898 
10899                         tsn = asoc->last_acked_seq + 1;
10900                         if (tsn == chk->rec.data.TSN_seq) {
10901                                 /*
10902                                  * we make a special exception for this
10903                                  * case. The peer has no rwnd but is missing
10904                                  * the lowest chunk.. which is probably what
10905                                  * is holding up the rwnd.
10906                                  */
10907                                 goto one_chunk_around;
10908                         }
10909                         return (1);
10910                 }
10911 one_chunk_around:
10912                 if (asoc->peers_rwnd < mtu) {
10913                         one_chunk = 1;
10914                         if ((asoc->peers_rwnd == 0) &&
10915                             (asoc->total_flight == 0)) {
10916                                 chk->window_probe = 1;
10917                                 chk->whoTo->window_probe = 1;
10918                         }
10919                 }
10920 #ifdef SCTP_AUDITING_ENABLED
10921                 sctp_audit_log(0xC3, 2);
10922 #endif
10923                 bundle_at = 0;
10924                 m = NULL;
10925                 net->fast_retran_ip = 0;
10926                 if (chk->rec.data.doing_fast_retransmit == 0) {
10927                         /*
10928                          * if no FR in progress skip destination that have
10929                          * flight_size > cwnd.
10930                          */
10931                         if (net->flight_size >= net->cwnd) {
10932                                 continue;
10933                         }
10934                 } else {
10935                         /*
10936                          * Mark the destination net to have FR recovery
10937                          * limits put on it.
10938                          */
10939                         *fr_done = 1;
10940                         net->fast_retran_ip = 1;
10941                 }
10942 
10943                 /*
10944                  * if no AUTH is yet included and this chunk requires it,
10945                  * make sure to account for it.  We don't apply the size
10946                  * until the AUTH chunk is actually added below in case
10947                  * there is no room for this chunk.
10948                  */
10949                 if (data_auth_reqd && (auth == NULL)) {
10950                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
10951                 } else
10952                         dmtu = 0;
10953 
10954                 if ((chk->send_size <= (mtu - dmtu)) ||
10955                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
10956                         /* ok we will add this one */
10957                         if (data_auth_reqd) {
10958                                 if (auth == NULL) {
10959                                         m = sctp_add_auth_chunk(m,
10960                                             &endofchain,
10961                                             &auth,
10962                                             &auth_offset,
10963                                             stcb,
10964                                             SCTP_DATA);
10965                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10966                                         auth_keyid = chk->auth_keyid;
10967                                 } else if (chk->auth_keyid != auth_keyid) {
10968                                         /* different keyid, so done bundling */
10969                                         break;
10970                                 }
10971                         }
10972                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
10973                         if (m == NULL) {
10974                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10975                                 return (ENOMEM);
10976                         }
10977                         /* Do clear IP_DF ? */
10978                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
10979                                 no_fragmentflg = 0;
10980                         }
10981                         /* upate our MTU size */
10982                         if (mtu > (chk->send_size + dmtu))
10983                                 mtu -= (chk->send_size + dmtu);
10984                         else
10985                                 mtu = 0;
10986                         data_list[bundle_at++] = chk;
10987                         if (one_chunk && (asoc->total_flight <= 0)) {
10988                                 SCTP_STAT_INCR(sctps_windowprobed);
10989                         }
10990                 }
10991                 if (one_chunk == 0) {
10992                         /*
10993                          * now are there anymore forward from chk to pick
10994                          * up?
10995                          */
10996                         fwd = TAILQ_NEXT(chk, sctp_next);
10997                         while (fwd) {
10998                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
10999                                         /* Nope, not for retran */
11000                                         fwd = TAILQ_NEXT(fwd, sctp_next);
11001                                         continue;
11002                                 }
11003                                 if (fwd->whoTo != net) {
11004                                         /* Nope, not the net in question */
11005                                         fwd = TAILQ_NEXT(fwd, sctp_next);
11006                                         continue;
11007                                 }
11008                                 if (data_auth_reqd && (auth == NULL)) {
11009                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
11010                                 } else
11011                                         dmtu = 0;
11012                                 if (fwd->send_size <= (mtu - dmtu)) {
11013                                         if (data_auth_reqd) {
11014                                                 if (auth == NULL) {
11015                                                         m = sctp_add_auth_chunk(m,
11016                                                             &endofchain,
11017                                                             &auth,
11018                                                             &auth_offset,
11019                                                             stcb,
11020                                                             SCTP_DATA);
11021                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11022                                                         auth_keyid = fwd->auth_keyid;
11023                                                 } else if (fwd->auth_keyid != auth_keyid) {
11024                                                         /*
11025                                                          * different keyid,
11026                                                          * so done bundling
11027                                                          */
11028                                                         break;
11029                                                 }
11030                                         }
11031                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
11032                                         if (m == NULL) {
11033                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11034                                                 return (ENOMEM);
11035                                         }
11036                                         /* Do clear IP_DF ? */
11037                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
11038                                                 no_fragmentflg = 0;
11039                                         }
11040                                         /* upate our MTU size */
11041                                         if (mtu > (fwd->send_size + dmtu))
11042                                                 mtu -= (fwd->send_size + dmtu);
11043                                         else
11044                                                 mtu = 0;
11045                                         data_list[bundle_at++] = fwd;
11046                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
11047                                                 break;
11048                                         }
11049                                         fwd = TAILQ_NEXT(fwd, sctp_next);
11050                                 } else {
11051                                         /* can't fit so we are done */
11052                                         break;
11053                                 }
11054                         }
11055                 }
11056                 /* Is there something to send for this destination? */
11057                 if (m) {
11058                         /*
11059                          * No matter if we fail/or suceed we should start a
11060                          * timer. A failure is like a lost IP packet :-)
11061                          */
11062                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
11063                                 /*
11064                                  * no timer running on this destination
11065                                  * restart it.
11066                                  */
11067                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
11068                                 tmr_started = 1;
11069                         }
11070                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
11071                         if (m == NULL) {
11072                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
11073                                 return (ENOBUFS);
11074                         }
11075                         shdr = mtod(m, struct sctphdr *);
11076                         shdr->src_port = inp->sctp_lport;
11077                         shdr->dest_port = stcb->rport;
11078                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
11079                         shdr->checksum = 0;
11080                         auth_offset += sizeof(struct sctphdr);
11081                         /*
11082                          * if doing DATA auth, use the data chunk(s) key id,
11083                          * otherwise use the assoc's active key id
11084                          */
11085                         if (!data_auth_reqd)
11086                                 auth_keyid = stcb->asoc.authinfo.active_keyid;
11087                         /* Now lets send it, if there is anything to send :> */
11088                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
11089                             (struct sockaddr *)&net->ro._l_addr, m,
11090                             auth_offset, auth, auth_keyid,
11091                             no_fragmentflg, 0, NULL, 0, net->port, so_locked, NULL))) {
11092                                 /* error, we could not output */
11093                                 SCTP_STAT_INCR(sctps_lowlevelerr);
11094                                 return (error);
11095                         }
11096                         m = endofchain = NULL;
11097                         auth = NULL;
11098                         auth_offset = 0;
11099                         /* For HB's */
11100                         /*
11101                          * We don't want to mark the net->sent time here
11102                          * since this we use this for HB and retrans cannot
11103                          * measure RTT
11104                          */
11105                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
11106 
11107                         /* For auto-close */
11108                         cnt_thru++;
11109                         if (*now_filled == 0) {
11110                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
11111                                 *now = asoc->time_last_sent;
11112                                 *now_filled = 1;
11113                         } else {
11114                                 asoc->time_last_sent = *now;
11115                         }
11116                         *cnt_out += bundle_at;
11117 #ifdef SCTP_AUDITING_ENABLED
11118                         sctp_audit_log(0xC4, bundle_at);
11119 #endif
11120                         if (bundle_at) {
11121                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
11122                         }
11123                         for (i = 0; i < bundle_at; i++) {
11124                                 SCTP_STAT_INCR(sctps_sendretransdata);
11125                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
11126                                 /*
11127                                  * When we have a revoked data, and we
11128                                  * retransmit it, then we clear the revoked
11129                                  * flag since this flag dictates if we
11130                                  * subtracted from the fs
11131                                  */
11132                                 if (data_list[i]->rec.data.chunk_was_revoked) {
11133                                         /* Deflate the cwnd */
11134                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
11135                                         data_list[i]->rec.data.chunk_was_revoked = 0;
11136                                 }
11137                                 data_list[i]->snd_count++;
11138                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
11139                                 /* record the time */
11140                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
11141                                 if (data_list[i]->book_size_scale) {
11142                                         /*
11143                                          * need to double the book size on
11144                                          * this one
11145                                          */
11146                                         data_list[i]->book_size_scale = 0;
11147                                         /*
11148                                          * Since we double the booksize, we
11149                                          * must also double the output queue
11150                                          * size, since this get shrunk when
11151                                          * we free by this amount.
11152                                          */
11153                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
11154                                         data_list[i]->book_size *= 2;
11155 
11156 
11157                                 } else {
11158                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
11159                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
11160                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
11161                                         }
11162                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
11163                                             (uint32_t) (data_list[i]->send_size +
11164                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
11165                                 }
11166                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
11167                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
11168                                             data_list[i]->whoTo->flight_size,
11169                                             data_list[i]->book_size,
11170                                             (uintptr_t) data_list[i]->whoTo,
11171                                             data_list[i]->rec.data.TSN_seq);
11172                                 }
11173                                 sctp_flight_size_increase(data_list[i]);
11174                                 sctp_total_flight_increase(stcb, data_list[i]);
11175                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
11176                                         /* SWS sender side engages */
11177                                         asoc->peers_rwnd = 0;
11178                                 }
11179                                 if ((i == 0) &&
11180                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
11181                                         SCTP_STAT_INCR(sctps_sendfastretrans);
11182                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
11183                                             (tmr_started == 0)) {
11184                                                 /*-
11185                                                  * ok we just fast-retrans'd
11186                                                  * the lowest TSN, i.e the
11187                                                  * first on the list. In
11188                                                  * this case we want to give
11189                                                  * some more time to get a
11190                                                  * SACK back without a
11191                                                  * t3-expiring.
11192                                                  */
11193                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
11194                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
11195                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
11196                                         }
11197                                 }
11198                         }
11199                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
11200                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
11201                         }
11202 #ifdef SCTP_AUDITING_ENABLED
11203                         sctp_auditing(21, inp, stcb, NULL);
11204 #endif
11205                 } else {
11206                         /* None will fit */
11207                         return (1);
11208                 }
11209                 if (asoc->sent_queue_retran_cnt <= 0) {
11210                         /* all done we have no more to retran */
11211                         asoc->sent_queue_retran_cnt = 0;
11212                         break;
11213                 }
11214                 if (one_chunk) {
11215                         /* No more room in rwnd */
11216                         return (1);
11217                 }
11218                 /* stop the for loop here. we sent out a packet */
11219                 break;
11220         }
11221         return (0);
11222 }
11223 
11224 
11225 static int
11226 sctp_timer_validation(struct sctp_inpcb *inp,
11227     struct sctp_tcb *stcb,
11228     struct sctp_association *asoc,
11229     int ret)
11230 {
11231         struct sctp_nets *net;
11232 
11233         /* Validate that a timer is running somewhere */
11234         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
11235                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
11236                         /* Here is a timer */
11237                         return (ret);
11238                 }
11239         }
11240         SCTP_TCB_LOCK_ASSERT(stcb);
11241         /* Gak, we did not have a timer somewhere */
11242         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
11243         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
11244         return (ret);
11245 }
11246 
11247 void
11248 sctp_chunk_output(struct sctp_inpcb *inp,
11249     struct sctp_tcb *stcb,
11250     int from_where,
11251     int so_locked
11252 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11253     SCTP_UNUSED
11254 #endif
11255 )
11256 {
11257         /*-
11258          * Ok this is the generic chunk service queue. we must do the
11259          * following:
11260          * - See if there are retransmits pending, if so we must
11261          *   do these first.
11262          * - Service the stream queue that is next, moving any
11263          *   message (note I must get a complete message i.e.
11264          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
11265          *   TSN's
11266          * - Check to see if the cwnd/rwnd allows any output, if so we
11267          *   go ahead and fomulate and send the low level chunks. Making sure
11268          *   to combine any control in the control chunk queue also.
11269          */
11270         struct sctp_association *asoc;
11271         struct sctp_nets *net;
11272         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
11273             burst_cnt = 0, burst_limit = 0;
11274         struct timeval now;
11275         int now_filled = 0;
11276         int cwnd_full = 0;
11277         int nagle_on = 0;
11278         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
11279         int un_sent = 0;
11280         int fr_done, tot_frs = 0;
11281 
11282         asoc = &stcb->asoc;
11283         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
11284                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
11285                         nagle_on = 0;
11286                 } else {
11287                         nagle_on = 1;
11288                 }
11289         }
11290         SCTP_TCB_LOCK_ASSERT(stcb);
11291 
11292         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
11293 
11294         if ((un_sent <= 0) &&
11295             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
11296             (asoc->sent_queue_retran_cnt == 0)) {
11297                 /* Nothing to do unless there is something to be sent left */
11298                 return;
11299         }
11300         /*
11301          * Do we have something to send, data or control AND a sack timer
11302          * running, if so piggy-back the sack.
11303          */
11304         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
11305                 /*
11306                  * EY if nr_sacks used then send an nr-sack , a sack
11307                  * otherwise
11308                  */
11309                 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack)
11310                         sctp_send_nr_sack(stcb);
11311                 else
11312                         sctp_send_sack(stcb);
11313                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
11314         }
11315         while (asoc->sent_queue_retran_cnt) {
11316                 /*-
11317                  * Ok, it is retransmission time only, we send out only ONE
11318                  * packet with a single call off to the retran code.
11319                  */
11320                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
11321                         /*-
11322                          * Special hook for handling cookiess discarded
11323                          * by peer that carried data. Send cookie-ack only
11324                          * and then the next call with get the retran's.
11325                          */
11326                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
11327                             &cwnd_full, from_where,
11328                             &now, &now_filled, frag_point, so_locked);
11329                         return;
11330                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
11331                         /* if its not from a HB then do it */
11332                         fr_done = 0;
11333                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
11334                         if (fr_done) {
11335                                 tot_frs++;
11336                         }
11337                 } else {
11338                         /*
11339                          * its from any other place, we don't allow retran
11340                          * output (only control)
11341                          */
11342                         ret = 1;
11343                 }
11344                 if (ret > 0) {
11345                         /* Can't send anymore */
11346                         /*-
11347                          * now lets push out control by calling med-level
11348                          * output once. this assures that we WILL send HB's
11349                          * if queued too.
11350                          */
11351                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
11352                             &cwnd_full, from_where,
11353                             &now, &now_filled, frag_point, so_locked);
11354 #ifdef SCTP_AUDITING_ENABLED
11355                         sctp_auditing(8, inp, stcb, NULL);
11356 #endif
11357                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
11358                         return;
11359                 }
11360                 if (ret < 0) {
11361                         /*-
11362                          * The count was off.. retran is not happening so do
11363                          * the normal retransmission.
11364                          */
11365 #ifdef SCTP_AUDITING_ENABLED
11366                         sctp_auditing(9, inp, stcb, NULL);
11367 #endif
11368                         if (ret == SCTP_RETRAN_EXIT) {
11369                                 return;
11370                         }
11371                         break;
11372                 }
11373                 if (from_where == SCTP_OUTPUT_FROM_T3) {
11374                         /* Only one transmission allowed out of a timeout */
11375 #ifdef SCTP_AUDITING_ENABLED
11376                         sctp_auditing(10, inp, stcb, NULL);
11377 #endif
11378                         /* Push out any control */
11379                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
11380                             &now, &now_filled, frag_point, so_locked);
11381                         return;
11382                 }
11383                 if (tot_frs > asoc->max_burst) {
11384                         /* Hit FR burst limit */
11385                         return;
11386                 }
11387                 if ((num_out == 0) && (ret == 0)) {
11388 
11389                         /* No more retrans to send */
11390                         break;
11391                 }
11392         }
11393 #ifdef SCTP_AUDITING_ENABLED
11394         sctp_auditing(12, inp, stcb, NULL);
11395 #endif
11396         /* Check for bad destinations, if they exist move chunks around. */
11397         burst_limit = asoc->max_burst;
11398         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
11399                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
11400                     SCTP_ADDR_NOT_REACHABLE) {
11401                         /*-
11402                          * if possible move things off of this address we
11403                          * still may send below due to the dormant state but
11404                          * we try to find an alternate address to send to
11405                          * and if we have one we move all queued data on the
11406                          * out wheel to this alternate address.
11407                          */
11408                         if (net->ref_count > 1)
11409                                 sctp_move_to_an_alt(stcb, asoc, net);
11410                 } else if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) &&
11411                             SCTP_BASE_SYSCTL(sctp_cmt_pf) &&
11412                     ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) {
11413                         /*
11414                          * JRS 5/14/07 - If CMT PF is on and the current
11415                          * destination is in PF state, move all queued data
11416                          * to an alternate desination.
11417                          */
11418                         if (net->ref_count > 1)
11419                                 sctp_move_to_an_alt(stcb, asoc, net);
11420                 } else {
11421                         /*-
11422                          * if ((asoc->sat_network) || (net->addr_is_local))
11423                          * { burst_limit = asoc->max_burst *
11424                          * SCTP_SAT_NETWORK_BURST_INCR; }
11425                          */
11426                         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
11427                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
11428                                         /*
11429                                          * JRS - Use the congestion control
11430                                          * given in the congestion control
11431                                          * module
11432                                          */
11433                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
11434                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
11435                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
11436                                         }
11437                                         SCTP_STAT_INCR(sctps_maxburstqueued);
11438                                 }
11439                                 net->fast_retran_ip = 0;
11440                         } else {
11441                                 if (net->flight_size == 0) {
11442                                         /* Should be decaying the cwnd here */
11443                                         ;
11444                                 }
11445                         }
11446                 }
11447 
11448         }
11449         burst_cnt = 0;
11450         cwnd_full = 0;
11451         do {
11452                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
11453                     &reason_code, 0, &cwnd_full, from_where,
11454                     &now, &now_filled, frag_point, so_locked);
11455                 if (error) {
11456                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
11457                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
11458                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
11459                         }
11460                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
11461                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
11462                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
11463                         }
11464                         break;
11465                 }
11466                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
11467 
11468                 tot_out += num_out;
11469                 burst_cnt++;
11470                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
11471                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
11472                         if (num_out == 0) {
11473                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
11474                         }
11475                 }
11476                 if (nagle_on) {
11477                         /*-
11478                          * When nagle is on, we look at how much is un_sent, then
11479                          * if its smaller than an MTU and we have data in
11480                          * flight we stop.
11481                          */
11482                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11483                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
11484                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
11485                             (stcb->asoc.total_flight > 0)) {
11486                                 break;
11487                         }
11488                 }
11489                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
11490                     TAILQ_EMPTY(&asoc->send_queue) &&
11491                     TAILQ_EMPTY(&asoc->out_wheel)) {
11492                         /* Nothing left to send */
11493                         break;
11494                 }
11495                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
11496                         /* Nothing left to send */
11497                         break;
11498                 }
11499         } while (num_out && (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
11500             (burst_cnt < burst_limit)));
11501 
11502         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
11503                 if (burst_cnt >= burst_limit) {
11504                         SCTP_STAT_INCR(sctps_maxburstqueued);
11505                         asoc->burst_limit_applied = 1;
11506                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
11507                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
11508                         }
11509                 } else {
11510                         asoc->burst_limit_applied = 0;
11511                 }
11512         }
11513         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
11514                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
11515         }
11516         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
11517             tot_out);
11518 
11519         /*-
11520          * Now we need to clean up the control chunk chain if a ECNE is on
11521          * it. It must be marked as UNSENT again so next call will continue
11522          * to send it until such time that we get a CWR, to remove it.
11523          */
11524         if (stcb->asoc.ecn_echo_cnt_onq)
11525                 sctp_fix_ecn_echo(asoc);
11526         return;
11527 }
11528 
11529 
11530 int
11531 sctp_output(inp, m, addr, control, p, flags)
11532         struct sctp_inpcb *inp;
11533         struct mbuf *m;
11534         struct sockaddr *addr;
11535         struct mbuf *control;
11536         struct thread *p;
11537         int flags;
11538 {
11539         if (inp == NULL) {
11540                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11541                 return (EINVAL);
11542         }
11543         if (inp->sctp_socket == NULL) {
11544                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11545                 return (EINVAL);
11546         }
11547         return (sctp_sosend(inp->sctp_socket,
11548             addr,
11549             (struct uio *)NULL,
11550             m,
11551             control,
11552             flags, p
11553             ));
11554 }
11555 
11556 void
11557 send_forward_tsn(struct sctp_tcb *stcb,
11558     struct sctp_association *asoc)
11559 {
11560         struct sctp_tmit_chunk *chk;
11561         struct sctp_forward_tsn_chunk *fwdtsn;
11562 
11563         SCTP_TCB_LOCK_ASSERT(stcb);
11564         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11565                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
11566                         /* mark it to unsent */
11567                         chk->sent = SCTP_DATAGRAM_UNSENT;
11568                         chk->snd_count = 0;
11569                         /* Do we correct its output location? */
11570                         if (chk->whoTo != asoc->primary_destination) {
11571                                 sctp_free_remote_addr(chk->whoTo);
11572                                 chk->whoTo = asoc->primary_destination;
11573                                 atomic_add_int(&chk->whoTo->ref_count, 1);
11574                         }
11575                         goto sctp_fill_in_rest;
11576                 }
11577         }
11578         /* Ok if we reach here we must build one */
11579         sctp_alloc_a_chunk(stcb, chk);
11580         if (chk == NULL) {
11581                 return;
11582         }
11583         chk->copy_by_ref = 0;
11584         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
11585         chk->rec.chunk_id.can_take_data = 0;
11586         chk->asoc = asoc;
11587         chk->whoTo = NULL;
11588 
11589         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
11590         if (chk->data == NULL) {
11591                 sctp_free_a_chunk(stcb, chk);
11592                 return;
11593         }
11594         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11595         chk->sent = SCTP_DATAGRAM_UNSENT;
11596         chk->snd_count = 0;
11597         chk->whoTo = asoc->primary_destination;
11598         atomic_add_int(&chk->whoTo->ref_count, 1);
11599         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
11600         asoc->ctrl_queue_cnt++;
11601 sctp_fill_in_rest:
11602         /*-
11603          * Here we go through and fill out the part that deals with
11604          * stream/seq of the ones we skip.
11605          */
11606         SCTP_BUF_LEN(chk->data) = 0;
11607         {
11608                 struct sctp_tmit_chunk *at, *tp1, *last;
11609                 struct sctp_strseq *strseq;
11610                 unsigned int cnt_of_space, i, ovh;
11611                 unsigned int space_needed;
11612                 unsigned int cnt_of_skipped = 0;
11613 
11614                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
11615                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
11616                                 /* no more to look at */
11617                                 break;
11618                         }
11619                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
11620                                 /* We don't report these */
11621                                 continue;
11622                         }
11623                         cnt_of_skipped++;
11624                 }
11625                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
11626                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
11627 
11628                 cnt_of_space = M_TRAILINGSPACE(chk->data);
11629 
11630                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
11631                         ovh = SCTP_MIN_OVERHEAD;
11632                 } else {
11633                         ovh = SCTP_MIN_V4_OVERHEAD;
11634                 }
11635                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
11636                         /* trim to a mtu size */
11637                         cnt_of_space = asoc->smallest_mtu - ovh;
11638                 }
11639                 if (cnt_of_space < space_needed) {
11640                         /*-
11641                          * ok we must trim down the chunk by lowering the
11642                          * advance peer ack point.
11643                          */
11644                         cnt_of_skipped = (cnt_of_space -
11645                             ((sizeof(struct sctp_forward_tsn_chunk)) /
11646                             sizeof(struct sctp_strseq)));
11647                         /*-
11648                          * Go through and find the TSN that will be the one
11649                          * we report.
11650                          */
11651                         at = TAILQ_FIRST(&asoc->sent_queue);
11652                         for (i = 0; i < cnt_of_skipped; i++) {
11653                                 tp1 = TAILQ_NEXT(at, sctp_next);
11654                                 at = tp1;
11655                         }
11656                         last = at;
11657                         /*-
11658                          * last now points to last one I can report, update
11659                          * peer ack point
11660                          */
11661                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
11662                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
11663                 }
11664                 chk->send_size = space_needed;
11665                 /* Setup the chunk */
11666                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
11667                 fwdtsn->ch.chunk_length = htons(chk->send_size);
11668                 fwdtsn->ch.chunk_flags = 0;
11669                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
11670                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
11671                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
11672                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
11673                 SCTP_BUF_LEN(chk->data) = chk->send_size;
11674                 fwdtsn++;
11675                 /*-
11676                  * Move pointer to after the fwdtsn and transfer to the
11677                  * strseq pointer.
11678                  */
11679                 strseq = (struct sctp_strseq *)fwdtsn;
11680                 /*-
11681                  * Now populate the strseq list. This is done blindly
11682                  * without pulling out duplicate stream info. This is
11683                  * inefficent but won't harm the process since the peer will
11684                  * look at these in sequence and will thus release anything.
11685                  * It could mean we exceed the PMTU and chop off some that
11686                  * we could have included.. but this is unlikely (aka 1432/4
11687                  * would mean 300+ stream seq's would have to be reported in
11688                  * one FWD-TSN. With a bit of work we can later FIX this to
11689                  * optimize and pull out duplcates.. but it does add more
11690                  * overhead. So for now... not!
11691                  */
11692                 at = TAILQ_FIRST(&asoc->sent_queue);
11693                 for (i = 0; i < cnt_of_skipped; i++) {
11694                         tp1 = TAILQ_NEXT(at, sctp_next);
11695                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
11696                                 /* We don't report these */
11697                                 i--;
11698                                 at = tp1;
11699                                 continue;
11700                         }
11701                         strseq->stream = ntohs(at->rec.data.stream_number);
11702                         strseq->sequence = ntohs(at->rec.data.stream_seq);
11703                         strseq++;
11704                         at = tp1;
11705                 }
11706         }
11707         return;
11708 
11709 }
11710 
11711 void
11712 sctp_send_sack(struct sctp_tcb *stcb)
11713 {
11714         /*-
11715          * Queue up a SACK in the control queue. We must first check to see
11716          * if a SACK is somehow on the control queue. If so, we will take
11717          * and and remove the old one.
11718          */
11719         struct sctp_association *asoc;
11720         struct sctp_tmit_chunk *chk, *a_chk;
11721         struct sctp_sack_chunk *sack;
11722         struct sctp_gap_ack_block *gap_descriptor;
11723         struct sack_track *selector;
11724         int mergeable = 0;
11725         int offset;
11726         caddr_t limit;
11727         uint32_t *dup;
11728         int limit_reached = 0;
11729         unsigned int i, jstart, siz, j;
11730         unsigned int num_gap_blocks = 0, space;
11731         int num_dups = 0;
11732         int space_req;
11733 
11734         a_chk = NULL;
11735         asoc = &stcb->asoc;
11736         SCTP_TCB_LOCK_ASSERT(stcb);
11737         if (asoc->last_data_chunk_from == NULL) {
11738                 /* Hmm we never received anything */
11739                 return;
11740         }
11741         sctp_set_rwnd(stcb, asoc);
11742         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11743                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
11744                         /* Hmm, found a sack already on queue, remove it */
11745                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
11746                         asoc->ctrl_queue_cnt++;
11747                         a_chk = chk;
11748                         if (a_chk->data) {
11749                                 sctp_m_freem(a_chk->data);
11750                                 a_chk->data = NULL;
11751                         }
11752                         sctp_free_remote_addr(a_chk->whoTo);
11753                         a_chk->whoTo = NULL;
11754                         break;
11755                 }
11756         }
11757         if (a_chk == NULL) {
11758                 sctp_alloc_a_chunk(stcb, a_chk);
11759                 if (a_chk == NULL) {
11760                         /* No memory so we drop the idea, and set a timer */
11761                         if (stcb->asoc.delayed_ack) {
11762                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
11763                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
11764                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
11765                                     stcb->sctp_ep, stcb, NULL);
11766                         } else {
11767                                 stcb->asoc.send_sack = 1;
11768                         }
11769                         return;
11770                 }
11771                 a_chk->copy_by_ref = 0;
11772                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
11773                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
11774                 a_chk->rec.chunk_id.can_take_data = 1;
11775         }
11776         /* Clear our pkt counts */
11777         asoc->data_pkts_seen = 0;
11778 
11779         a_chk->asoc = asoc;
11780         a_chk->snd_count = 0;
11781         a_chk->send_size = 0;   /* fill in later */
11782         a_chk->sent = SCTP_DATAGRAM_UNSENT;
11783         a_chk->whoTo = NULL;
11784 
11785         if ((asoc->numduptsns) ||
11786             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
11787             ) {
11788                 /*-
11789                  * Ok, we have some duplicates or the destination for the
11790                  * sack is unreachable, lets see if we can select an
11791                  * alternate than asoc->last_data_chunk_from
11792                  */
11793                 if ((!(asoc->last_data_chunk_from->dest_state &
11794                     SCTP_ADDR_NOT_REACHABLE)) &&
11795                     (asoc->used_alt_onsack > asoc->numnets)) {
11796                         /* We used an alt last time, don't this time */
11797                         a_chk->whoTo = NULL;
11798                 } else {
11799                         asoc->used_alt_onsack++;
11800                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
11801                 }
11802                 if (a_chk->whoTo == NULL) {
11803                         /* Nope, no alternate */
11804                         a_chk->whoTo = asoc->last_data_chunk_from;
11805                         asoc->used_alt_onsack = 0;
11806                 }
11807         } else {
11808                 /*
11809                  * No duplicates so we use the last place we received data
11810                  * from.
11811                  */
11812                 asoc->used_alt_onsack = 0;
11813                 a_chk->whoTo = asoc->last_data_chunk_from;
11814         }
11815         if (a_chk->whoTo) {
11816                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
11817         }
11818         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
11819                 /* no gaps */
11820                 space_req = sizeof(struct sctp_sack_chunk);
11821         } else {
11822                 /* gaps get a cluster */
11823                 space_req = MCLBYTES;
11824         }
11825         /* Ok now lets formulate a MBUF with our sack */
11826         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
11827         if ((a_chk->data == NULL) ||
11828             (a_chk->whoTo == NULL)) {
11829                 /* rats, no mbuf memory */
11830                 if (a_chk->data) {
11831                         /* was a problem with the destination */
11832                         sctp_m_freem(a_chk->data);
11833                         a_chk->data = NULL;
11834                 }
11835                 sctp_free_a_chunk(stcb, a_chk);
11836                 /* sa_ignore NO_NULL_CHK */
11837                 if (stcb->asoc.delayed_ack) {
11838                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
11839                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
11840                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
11841                             stcb->sctp_ep, stcb, NULL);
11842                 } else {
11843                         stcb->asoc.send_sack = 1;
11844                 }
11845                 return;
11846         }
11847         /* ok, lets go through and fill it in */
11848         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
11849         space = M_TRAILINGSPACE(a_chk->data);
11850         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
11851                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
11852         }
11853         limit = mtod(a_chk->data, caddr_t);
11854         limit += space;
11855 
11856         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
11857         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
11858         /* 0x01 is used by nonce for ecn */
11859         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
11860             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
11861             (asoc->peer_supports_ecn_nonce))
11862                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
11863         else
11864                 sack->ch.chunk_flags = 0;
11865 
11866         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
11867                 /*-
11868                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
11869                  * received, then set high bit to 1, else 0. Reset
11870                  * pkts_rcvd.
11871                  */
11872                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
11873                 asoc->cmt_dac_pkts_rcvd = 0;
11874         }
11875 #ifdef SCTP_ASOCLOG_OF_TSNS
11876         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
11877         stcb->asoc.cumack_log_atsnt++;
11878         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
11879                 stcb->asoc.cumack_log_atsnt = 0;
11880         }
11881 #endif
11882         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
11883         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
11884         asoc->my_last_reported_rwnd = asoc->my_rwnd;
11885 
11886         /* reset the readers interpretation */
11887         stcb->freed_by_sorcv_sincelast = 0;
11888 
11889         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
11890 
11891         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
11892         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
11893                 offset = 1;
11894                 /*-
11895                  * cum-ack behind the mapping array, so we start and use all
11896                  * entries.
11897                  */
11898                 jstart = 0;
11899         } else {
11900                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
11901                 /*-
11902                  * we skip the first one when the cum-ack is at or above the
11903                  * mapping array base. Note this only works if
11904                  */
11905                 jstart = 1;
11906         }
11907         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
11908                 /* we have a gap .. maybe */
11909                 for (i = 0; i < siz; i++) {
11910                         selector = &sack_array[asoc->mapping_array[i]];
11911                         if (mergeable && selector->right_edge) {
11912                                 /*
11913                                  * Backup, left and right edges were ok to
11914                                  * merge.
11915                                  */
11916                                 num_gap_blocks--;
11917                                 gap_descriptor--;
11918                         }
11919                         if (selector->num_entries == 0)
11920                                 mergeable = 0;
11921                         else {
11922                                 for (j = jstart; j < selector->num_entries; j++) {
11923                                         if (mergeable && selector->right_edge) {
11924                                                 /*
11925                                                  * do a merge by NOT setting
11926                                                  * the left side
11927                                                  */
11928                                                 mergeable = 0;
11929                                         } else {
11930                                                 /*
11931                                                  * no merge, set the left
11932                                                  * side
11933                                                  */
11934                                                 mergeable = 0;
11935                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
11936                                         }
11937                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
11938                                         num_gap_blocks++;
11939                                         gap_descriptor++;
11940                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
11941                                                 /* no more room */
11942                                                 limit_reached = 1;
11943                                                 break;
11944                                         }
11945                                 }
11946                                 if (selector->left_edge) {
11947                                         mergeable = 1;
11948                                 }
11949                         }
11950                         if (limit_reached) {
11951                                 /* Reached the limit stop */
11952                                 break;
11953                         }
11954                         jstart = 0;
11955                         offset += 8;
11956                 }
11957                 if (num_gap_blocks == 0) {
11958                         /*
11959                          * slide not yet happened, and somehow we got called
11960                          * to send a sack. Cumack needs to move up.
11961                          */
11962                         int abort_flag = 0;
11963 
11964                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
11965                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
11966                         sctp_sack_check(stcb, 0, 0, &abort_flag);
11967                 }
11968         }
11969         /* now we must add any dups we are going to report. */
11970         if ((limit_reached == 0) && (asoc->numduptsns)) {
11971                 dup = (uint32_t *) gap_descriptor;
11972                 for (i = 0; i < asoc->numduptsns; i++) {
11973                         *dup = htonl(asoc->dup_tsns[i]);
11974                         dup++;
11975                         num_dups++;
11976                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
11977                                 /* no more room */
11978                                 break;
11979                         }
11980                 }
11981                 asoc->numduptsns = 0;
11982         }
11983         /*
11984          * now that the chunk is prepared queue it to the control chunk
11985          * queue.
11986          */
11987         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
11988             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
11989             (num_dups * sizeof(int32_t)));
11990         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
11991         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
11992         sack->sack.num_dup_tsns = htons(num_dups);
11993         sack->ch.chunk_length = htons(a_chk->send_size);
11994         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
11995         asoc->ctrl_queue_cnt++;
11996         asoc->send_sack = 0;
11997         SCTP_STAT_INCR(sctps_sendsacks);
11998         return;
11999 }
12000 
12001 /* EY - This method will replace sctp_send_sack method if nr_sacks negotiated*/
12002 void
12003 sctp_send_nr_sack(struct sctp_tcb *stcb)
12004 {
12005         /*-
12006          * Queue up an NR-SACK in the control queue. We must first check to see
12007          * if an NR-SACK is somehow on the control queue. If so, we will take
12008          * and and remove the old one.
12009          */
12010         struct sctp_association *asoc;
12011         struct sctp_tmit_chunk *chk, *a_chk;
12012 
12013         struct sctp_nr_sack_chunk *nr_sack;
12014 
12015         struct sctp_gap_ack_block *gap_descriptor;
12016         struct sctp_nr_gap_ack_block *nr_gap_descriptor;
12017 
12018         struct sack_track *selector;
12019         struct nr_sack_track *nr_selector;
12020 
12021         /* EY do we need nr_mergeable, NO */
12022         int mergeable = 0;
12023         int offset;
12024         caddr_t limit;
12025         uint32_t *dup;
12026         int limit_reached = 0;
12027         unsigned int i, jstart, siz, j;
12028         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
12029         int num_dups = 0;
12030         int space_req;
12031         unsigned int reserved = 0;
12032 
12033         a_chk = NULL;
12034         asoc = &stcb->asoc;
12035         SCTP_TCB_LOCK_ASSERT(stcb);
12036         if (asoc->last_data_chunk_from == NULL) {
12037                 /* Hmm we never received anything */
12038                 return;
12039         }
12040         sctp_set_rwnd(stcb, asoc);
12041         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
12042                 if (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) {
12043                         /* Hmm, found a sack already on queue, remove it */
12044                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
12045                         asoc->ctrl_queue_cnt++;
12046                         a_chk = chk;
12047                         if (a_chk->data) {
12048                                 sctp_m_freem(a_chk->data);
12049                                 a_chk->data = NULL;
12050                         }
12051                         sctp_free_remote_addr(a_chk->whoTo);
12052                         a_chk->whoTo = NULL;
12053                         break;
12054                 }
12055         }
12056         if (a_chk == NULL) {
12057                 sctp_alloc_a_chunk(stcb, a_chk);
12058                 if (a_chk == NULL) {
12059                         /* No memory so we drop the idea, and set a timer */
12060                         if (stcb->asoc.delayed_ack) {
12061                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
12062                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12063                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
12064                                     stcb->sctp_ep, stcb, NULL);
12065                         } else {
12066                                 stcb->asoc.send_sack = 1;
12067                         }
12068                         return;
12069                 }
12070                 a_chk->copy_by_ref = 0;
12071                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
12072                 a_chk->rec.chunk_id.id = SCTP_NR_SELECTIVE_ACK;
12073                 a_chk->rec.chunk_id.can_take_data = 1;
12074         }
12075         /* Clear our pkt counts */
12076         asoc->data_pkts_seen = 0;
12077 
12078         a_chk->asoc = asoc;
12079         a_chk->snd_count = 0;
12080         a_chk->send_size = 0;   /* fill in later */
12081         a_chk->sent = SCTP_DATAGRAM_UNSENT;
12082         a_chk->whoTo = NULL;
12083 
12084         if ((asoc->numduptsns) ||
12085             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
12086             ) {
12087                 /*-
12088                  * Ok, we have some duplicates or the destination for the
12089                  * sack is unreachable, lets see if we can select an
12090                  * alternate than asoc->last_data_chunk_from
12091                  */
12092                 if ((!(asoc->last_data_chunk_from->dest_state &
12093                     SCTP_ADDR_NOT_REACHABLE)) &&
12094                     (asoc->used_alt_onsack > asoc->numnets)) {
12095                         /* We used an alt last time, don't this time */
12096                         a_chk->whoTo = NULL;
12097                 } else {
12098                         asoc->used_alt_onsack++;
12099                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
12100                 }
12101                 if (a_chk->whoTo == NULL) {
12102                         /* Nope, no alternate */
12103                         a_chk->whoTo = asoc->last_data_chunk_from;
12104                         asoc->used_alt_onsack = 0;
12105                 }
12106         } else {
12107                 /*
12108                  * No duplicates so we use the last place we received data
12109                  * from.
12110                  */
12111                 asoc->used_alt_onsack = 0;
12112                 a_chk->whoTo = asoc->last_data_chunk_from;
12113         }
12114         if (a_chk->whoTo) {
12115                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
12116         }
12117         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
12118                 /* no gaps */
12119                 space_req = sizeof(struct sctp_nr_sack_chunk);
12120         } else {
12121                 /* EY - what is this about? */
12122                 /* gaps get a cluster */
12123                 space_req = MCLBYTES;
12124         }
12125         /* Ok now lets formulate a MBUF with our sack */
12126         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
12127         if ((a_chk->data == NULL) ||
12128             (a_chk->whoTo == NULL)) {
12129                 /* rats, no mbuf memory */
12130                 if (a_chk->data) {
12131                         /* was a problem with the destination */
12132                         sctp_m_freem(a_chk->data);
12133                         a_chk->data = NULL;
12134                 }
12135                 sctp_free_a_chunk(stcb, a_chk);
12136                 /* sa_ignore NO_NULL_CHK */
12137                 if (stcb->asoc.delayed_ack) {
12138                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
12139                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12140                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
12141                             stcb->sctp_ep, stcb, NULL);
12142                 } else {
12143                         stcb->asoc.send_sack = 1;
12144                 }
12145                 return;
12146         }
12147         /* ok, lets go through and fill it in */
12148         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
12149         space = M_TRAILINGSPACE(a_chk->data);
12150         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
12151                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
12152         }
12153         limit = mtod(a_chk->data, caddr_t);
12154         limit += space;
12155 
12156         nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
12157         nr_sack->ch.chunk_type = SCTP_NR_SELECTIVE_ACK;
12158         /* EYJ */
12159         /* 0x01 is used by nonce for ecn */
12160         if ((SCTP_BASE_SYSCTL(sctp_ecn_enable)) &&
12161             (SCTP_BASE_SYSCTL(sctp_ecn_nonce)) &&
12162             (asoc->peer_supports_ecn_nonce))
12163                 nr_sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
12164         else
12165                 nr_sack->ch.chunk_flags = 0;
12166 
12167         if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
12168                 /*-
12169                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
12170                  * received, then set high bit to 1, else 0. Reset
12171                  * pkts_rcvd.
12172                  */
12173                 /* EY - TODO: which chunk flag is used in here? -The LSB */
12174                 nr_sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
12175                 asoc->cmt_dac_pkts_rcvd = 0;
12176         }
12177         /*
12178          * EY - this is a never reneging receiver, that makes all gaps are
12179          * nr-gaps, set the All bit
12180          */
12181         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
12182                 nr_sack->ch.chunk_flags |= SCTP_NR_SACK_ALL_BIT;
12183         }
12184 #ifdef SCTP_ASOCLOG_OF_TSNS
12185         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
12186         stcb->asoc.cumack_log_atsnt++;
12187         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
12188                 stcb->asoc.cumack_log_atsnt = 0;
12189         }
12190 #endif
12191         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
12192         nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
12193         asoc->my_last_reported_rwnd = asoc->my_rwnd;
12194 
12195         /* reset the readers interpretation */
12196         stcb->freed_by_sorcv_sincelast = 0;
12197 
12198         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
12199         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
12200 
12201         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
12202         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
12203                 offset = 1;
12204                 /*-
12205                  * cum-ack behind the mapping array, so we start and use all
12206                  * entries.
12207                  */
12208                 jstart = 0;
12209         } else {
12210                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
12211                 /*-
12212                  * we skip the first one when the cum-ack is at or above the
12213                  * mapping array base. Note this only works if
12214                  */
12215                 jstart = 1;
12216         }
12217         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
12218                 /* we have a gap .. maybe */
12219                 for (i = 0; i < siz; i++) {
12220                         selector = &sack_array[asoc->mapping_array[i]];
12221                         if (mergeable && selector->right_edge) {
12222                                 /*
12223                                  * Backup, left and right edges were ok to
12224                                  * merge.
12225                                  */
12226                                 num_gap_blocks--;
12227                                 gap_descriptor--;
12228                         }
12229                         if (selector->num_entries == 0)
12230                                 mergeable = 0;
12231                         else {
12232                                 for (j = jstart; j < selector->num_entries; j++) {
12233                                         if (mergeable && selector->right_edge) {
12234                                                 /*
12235                                                  * do a merge by NOT setting
12236                                                  * the left side
12237                                                  */
12238                                                 mergeable = 0;
12239                                         } else {
12240                                                 /*
12241                                                  * no merge, set the left
12242                                                  * side
12243                                                  */
12244                                                 mergeable = 0;
12245                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
12246                                         }
12247                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
12248                                         num_gap_blocks++;
12249                                         gap_descriptor++;
12250                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
12251                                                 /* no more room */
12252                                                 limit_reached = 1;
12253                                                 break;
12254                                         }
12255                                 }
12256                                 if (selector->left_edge) {
12257                                         mergeable = 1;
12258                                 }
12259                         }
12260                         if (limit_reached) {
12261                                 /* Reached the limit stop */
12262                                 break;
12263                         }
12264                         jstart = 0;
12265                         offset += 8;
12266                 }
12267                 if (num_gap_blocks == 0) {
12268                         /*
12269                          * slide not yet happened, and somehow we got called
12270                          * to send a sack. Cumack needs to move up.
12271                          */
12272                         int abort_flag = 0;
12273 
12274                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
12275                         nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
12276                         sctp_sack_check(stcb, 0, 0, &abort_flag);
12277                 }
12278         }
12279         /*---------------------------------------------------------filling the nr_gap_ack blocks----------------------------------------------------*/
12280 
12281         nr_gap_descriptor = (struct sctp_nr_gap_ack_block *)gap_descriptor;
12282 
12283         /* EY - there will be gaps + nr_gaps if draining is possible */
12284         if (SCTP_BASE_SYSCTL(sctp_do_drain)) {
12285 
12286                 mergeable = 0;
12287 
12288                 siz = (((asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn) + 1) + 7) / 8;
12289                 if (compare_with_wrap(asoc->nr_mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
12290                         offset = 1;
12291                         /*-
12292                         * cum-ack behind the mapping array, so we start and use all
12293                         * entries.
12294                         */
12295                         jstart = 0;
12296                 } else {
12297                         offset = asoc->nr_mapping_array_base_tsn - asoc->cumulative_tsn;
12298                         /*-
12299                         * we skip the first one when the cum-ack is at or above the
12300                         * mapping array base. Note this only works if
12301                         */
12302                         jstart = 1;
12303                 }
12304                 if (compare_with_wrap(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn, MAX_TSN)) {
12305                         /* we have a gap .. maybe */
12306                         for (i = 0; i < siz; i++) {
12307                                 nr_selector = &nr_sack_array[asoc->nr_mapping_array[i]];
12308                                 if (mergeable && nr_selector->right_edge) {
12309                                         /*
12310                                          * Backup, left and right edges were
12311                                          * ok to merge.
12312                                          */
12313                                         num_nr_gap_blocks--;
12314                                         nr_gap_descriptor--;
12315                                 }
12316                                 if (nr_selector->num_entries == 0)
12317                                         mergeable = 0;
12318                                 else {
12319                                         for (j = jstart; j < nr_selector->num_entries; j++) {
12320                                                 if (mergeable && nr_selector->right_edge) {
12321                                                         /*
12322                                                          * do a merge by NOT
12323                                                          * setting the left
12324                                                          * side
12325                                                          */
12326                                                         mergeable = 0;
12327                                                 } else {
12328                                                         /*
12329                                                          * no merge, set the
12330                                                          * left side
12331                                                          */
12332                                                         mergeable = 0;
12333                                                         nr_gap_descriptor->start = htons((nr_selector->nr_gaps[j].start + offset));
12334                                                 }
12335                                                 nr_gap_descriptor->end = htons((nr_selector->nr_gaps[j].end + offset));
12336                                                 num_nr_gap_blocks++;
12337                                                 nr_gap_descriptor++;
12338                                                 if (((caddr_t)nr_gap_descriptor + sizeof(struct sctp_nr_gap_ack_block)) > limit) {
12339                                                         /* no more room */
12340                                                         limit_reached = 1;
12341                                                         break;
12342                                                 }
12343                                         }
12344                                         if (nr_selector->left_edge) {
12345                                                 mergeable = 1;
12346                                         }
12347                                 }
12348                                 if (limit_reached) {
12349                                         /* Reached the limit stop */
12350                                         break;
12351                                 }
12352                                 jstart = 0;
12353                                 offset += 8;
12354                         }
12355                 }
12356         }
12357         /*---------------------------------------------------End of---filling the nr_gap_ack blocks----------------------------------------------------*/
12358 
12359         /* now we must add any dups we are going to report. */
12360         if ((limit_reached == 0) && (asoc->numduptsns)) {
12361                 dup = (uint32_t *) nr_gap_descriptor;
12362                 for (i = 0; i < asoc->numduptsns; i++) {
12363                         *dup = htonl(asoc->dup_tsns[i]);
12364                         dup++;
12365                         num_dups++;
12366                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
12367                                 /* no more room */
12368                                 break;
12369                         }
12370                 }
12371                 asoc->numduptsns = 0;
12372         }
12373         /*
12374          * now that the chunk is prepared queue it to the control chunk
12375          * queue.
12376          */
12377         if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
12378                 num_nr_gap_blocks = num_gap_blocks;
12379                 num_gap_blocks = 0;
12380         }
12381         a_chk->send_size = (sizeof(struct sctp_nr_sack_chunk) +
12382             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
12383             (num_nr_gap_blocks * sizeof(struct sctp_nr_gap_ack_block)) +
12384             (num_dups * sizeof(int32_t)));
12385 
12386         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
12387         nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
12388         nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
12389         nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
12390         nr_sack->nr_sack.reserved = htons(reserved);
12391         nr_sack->ch.chunk_length = htons(a_chk->send_size);
12392         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
12393         asoc->ctrl_queue_cnt++;
12394         asoc->send_sack = 0;
12395         SCTP_STAT_INCR(sctps_sendsacks);
12396         return;
12397 }
12398 
12399 void
12400 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
12401 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
12402     SCTP_UNUSED
12403 #endif
12404 )
12405 {
12406         struct mbuf *m_abort;
12407         struct mbuf *m_out = NULL, *m_end = NULL;
12408         struct sctp_abort_chunk *abort = NULL;
12409         int sz;
12410         uint32_t auth_offset = 0;
12411         struct sctp_auth_chunk *auth = NULL;
12412         struct sctphdr *shdr;
12413 
12414         /*-
12415          * Add an AUTH chunk, if chunk requires it and save the offset into
12416          * the chain for AUTH
12417          */
12418         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
12419             stcb->asoc.peer_auth_chunks)) {
12420                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
12421                     stcb, SCTP_ABORT_ASSOCIATION);
12422                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12423         }
12424         SCTP_TCB_LOCK_ASSERT(stcb);
12425         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
12426         if (m_abort == NULL) {
12427                 /* no mbuf's */
12428                 if (m_out)
12429                         sctp_m_freem(m_out);
12430                 return;
12431         }
12432         /* link in any error */
12433         SCTP_BUF_NEXT(m_abort) = operr;
12434         sz = 0;
12435         if (operr) {
12436                 struct mbuf *n;
12437 
12438                 n = operr;
12439                 while (n) {
12440                         sz += SCTP_BUF_LEN(n);
12441                         n = SCTP_BUF_NEXT(n);
12442                 }
12443         }
12444         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
12445         if (m_out == NULL) {
12446                 /* NO Auth chunk prepended, so reserve space in front */
12447                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
12448                 m_out = m_abort;
12449         } else {
12450                 /* Put AUTH chunk at the front of the chain */
12451                 SCTP_BUF_NEXT(m_end) = m_abort;
12452         }
12453 
12454         /* fill in the ABORT chunk */
12455         abort = mtod(m_abort, struct sctp_abort_chunk *);
12456         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
12457         abort->ch.chunk_flags = 0;
12458         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
12459 
12460         /* prepend and fill in the SCTP header */
12461         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
12462         if (m_out == NULL) {
12463                 /* TSNH: no memory */
12464                 return;
12465         }
12466         shdr = mtod(m_out, struct sctphdr *);
12467         shdr->src_port = stcb->sctp_ep->sctp_lport;
12468         shdr->dest_port = stcb->rport;
12469         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
12470         shdr->checksum = 0;
12471         auth_offset += sizeof(struct sctphdr);
12472 
12473         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
12474             stcb->asoc.primary_destination,
12475             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
12476             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, NULL, 0, stcb->asoc.primary_destination->port, so_locked, NULL);
12477         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12478 }
12479 
12480 void
12481 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
12482     struct sctp_nets *net)
12483 {
12484         /* formulate and SEND a SHUTDOWN-COMPLETE */
12485         struct mbuf *m_shutdown_comp;
12486         struct sctp_shutdown_complete_msg *comp_cp;
12487 
12488         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
12489         if (m_shutdown_comp == NULL) {
12490                 /* no mbuf's */
12491                 return;
12492         }
12493         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
12494         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
12495         comp_cp->shut_cmp.ch.chunk_flags = 0;
12496         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
12497         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
12498         comp_cp->sh.dest_port = stcb->rport;
12499         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
12500         comp_cp->sh.checksum = 0;
12501 
12502         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
12503         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
12504             (struct sockaddr *)&net->ro._l_addr,
12505             m_shutdown_comp, 0, NULL, 0, 1, 0, NULL, 0, net->port, SCTP_SO_NOT_LOCKED, NULL);
12506         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12507         return;
12508 }
12509 
12510 void
12511 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
12512     uint32_t vrf_id, uint16_t port)
12513 {
12514         /* formulate and SEND a SHUTDOWN-COMPLETE */
12515         struct mbuf *o_pak;
12516         struct mbuf *mout;
12517         struct ip *iph, *iph_out;
12518         struct udphdr *udp = NULL;
12519 
12520 #ifdef INET6
12521         struct ip6_hdr *ip6, *ip6_out;
12522 
12523 #endif
12524         int offset_out, len, mlen;
12525         struct sctp_shutdown_complete_msg *comp_cp;
12526 
12527         iph = mtod(m, struct ip *);
12528         switch (iph->ip_v) {
12529         case IPVERSION:
12530                 len = (sizeof(struct ip) + sizeof(struct sctp_shutdown_complete_msg));
12531                 break;
12532 #ifdef INET6
12533         case IPV6_VERSION >> 4:
12534                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
12535                 break;
12536 #endif
12537         default:
12538                 return;
12539         }
12540         if (port) {
12541                 len += sizeof(struct udphdr);
12542         }
12543         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
12544         if (mout == NULL) {
12545                 return;
12546         }
12547         SCTP_BUF_LEN(mout) = len;
12548         SCTP_BUF_NEXT(mout) = NULL;
12549         iph_out = NULL;
12550 #ifdef INET6
12551         ip6_out = NULL;
12552 #endif
12553         offset_out = 0;
12554 
12555         switch (iph->ip_v) {
12556         case IPVERSION:
12557                 iph_out = mtod(mout, struct ip *);
12558 
12559                 /* Fill in the IP header for the ABORT */
12560                 iph_out->ip_v = IPVERSION;
12561                 iph_out->ip_hl = (sizeof(struct ip) / 4);
12562                 iph_out->ip_tos = (u_char)0;
12563                 iph_out->ip_id = 0;
12564                 iph_out->ip_off = 0;
12565                 iph_out->ip_ttl = MAXTTL;
12566                 if (port) {
12567                         iph_out->ip_p = IPPROTO_UDP;
12568                 } else {
12569                         iph_out->ip_p = IPPROTO_SCTP;
12570                 }
12571                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
12572                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
12573 
12574                 /* let IP layer calculate this */
12575                 iph_out->ip_sum = 0;
12576                 offset_out += sizeof(*iph_out);
12577                 comp_cp = (struct sctp_shutdown_complete_msg *)(
12578                     (caddr_t)iph_out + offset_out);
12579                 break;
12580 #ifdef INET6
12581         case IPV6_VERSION >> 4:
12582                 ip6 = (struct ip6_hdr *)iph;
12583                 ip6_out = mtod(mout, struct ip6_hdr *);
12584 
12585                 /* Fill in the IPv6 header for the ABORT */
12586                 ip6_out->ip6_flow = ip6->ip6_flow;
12587                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
12588                 if (port) {
12589                         ip6_out->ip6_nxt = IPPROTO_UDP;
12590                 } else {
12591                         ip6_out->ip6_nxt = IPPROTO_SCTP;
12592                 }
12593                 ip6_out->ip6_src = ip6->ip6_dst;
12594                 ip6_out->ip6_dst = ip6->ip6_src;
12595                 /*
12596                  * ?? The old code had both the iph len + payload, I think
12597                  * this is wrong and would never have worked
12598                  */
12599                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
12600                 offset_out += sizeof(*ip6_out);
12601                 comp_cp = (struct sctp_shutdown_complete_msg *)(
12602                     (caddr_t)ip6_out + offset_out);
12603                 break;
12604 #endif                          /* INET6 */
12605         default:
12606                 /* Currently not supported. */
12607                 return;
12608         }
12609         if (port) {
12610                 udp = (struct udphdr *)comp_cp;
12611                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
12612                 udp->uh_dport = port;
12613                 udp->uh_ulen = htons(sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr));
12614                 udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
12615                 offset_out += sizeof(struct udphdr);
12616                 comp_cp = (struct sctp_shutdown_complete_msg *)((caddr_t)comp_cp + sizeof(struct udphdr));
12617         }
12618         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
12619                 /* no mbuf's */
12620                 sctp_m_freem(mout);
12621                 return;
12622         }
12623         /* Now copy in and fill in the ABORT tags etc. */
12624         comp_cp->sh.src_port = sh->dest_port;
12625         comp_cp->sh.dest_port = sh->src_port;
12626         comp_cp->sh.checksum = 0;
12627         comp_cp->sh.v_tag = sh->v_tag;
12628         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
12629         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
12630         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
12631 
12632         /* add checksum */
12633         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
12634         if (iph_out != NULL) {
12635                 sctp_route_t ro;
12636                 int ret;
12637                 struct sctp_tcb *stcb = NULL;
12638 
12639                 mlen = SCTP_BUF_LEN(mout);
12640                 bzero(&ro, sizeof ro);
12641                 /* set IPv4 length */
12642                 iph_out->ip_len = mlen;
12643 #ifdef  SCTP_PACKET_LOGGING
12644                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12645                         sctp_packet_log(mout, mlen);
12646 #endif
12647                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
12648                 if (port) {
12649                         SCTP_ENABLE_UDP_CSUM(o_pak);
12650                 }
12651                 /* out it goes */
12652                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
12653 
12654                 /* Free the route if we got one back */
12655                 if (ro.ro_rt)
12656                         RTFREE(ro.ro_rt);
12657         }
12658 #ifdef INET6
12659         if (ip6_out != NULL) {
12660                 struct route_in6 ro;
12661                 int ret;
12662                 struct sctp_tcb *stcb = NULL;
12663                 struct ifnet *ifp = NULL;
12664 
12665                 bzero(&ro, sizeof(ro));
12666                 mlen = SCTP_BUF_LEN(mout);
12667 #ifdef  SCTP_PACKET_LOGGING
12668                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
12669                         sctp_packet_log(mout, mlen);
12670 #endif
12671                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
12672                 if (port) {
12673                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr),
12674                             sizeof(struct sctp_shutdown_complete_msg) + sizeof(struct udphdr))) == 0) {
12675                                 udp->uh_sum = 0xffff;
12676                         }
12677                 }
12678                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
12679 
12680                 /* Free the route if we got one back */
12681                 if (ro.ro_rt)
12682                         RTFREE(ro.ro_rt);
12683         }
12684 #endif
12685         SCTP_STAT_INCR(sctps_sendpackets);
12686         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
12687         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
12688         return;
12689 
12690 }
12691 
12692 static struct sctp_nets *
12693 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
12694 {
12695         struct sctp_nets *net, *hnet;
12696         int ms_goneby, highest_ms, state_overide = 0;
12697 
12698         (void)SCTP_GETTIME_TIMEVAL(now);
12699         highest_ms = 0;
12700         hnet = NULL;
12701         SCTP_TCB_LOCK_ASSERT(stcb);
12702         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
12703                 if (
12704                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
12705                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
12706                     ) {
12707                         /*
12708                          * Skip this guy from consideration if HB is off AND
12709                          * its confirmed
12710                          */
12711                         continue;
12712                 }
12713                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
12714                         /* skip this dest net from consideration */
12715                         continue;
12716                 }
12717                 if (net->last_sent_time.tv_sec) {
12718                         /* Sent to so we subtract */
12719                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
12720                 } else
12721                         /* Never been sent to */
12722                         ms_goneby = 0x7fffffff;
12723                 /*-
12724                  * When the address state is unconfirmed but still
12725                  * considered reachable, we HB at a higher rate. Once it
12726                  * goes confirmed OR reaches the "unreachable" state, thenw
12727                  * we cut it back to HB at a more normal pace.
12728                  */
12729                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
12730                         state_overide = 1;
12731                 } else {
12732                         state_overide = 0;
12733                 }
12734 
12735                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
12736                     (ms_goneby > highest_ms)) {
12737                         highest_ms = ms_goneby;
12738                         hnet = net;
12739                 }
12740         }
12741         if (hnet &&
12742             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
12743                 state_overide = 1;
12744         } else {
12745                 state_overide = 0;
12746         }
12747 
12748         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
12749                 /*-
12750                  * Found the one with longest delay bounds OR it is
12751                  * unconfirmed and still not marked unreachable.
12752                  */
12753                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
12754 #ifdef SCTP_DEBUG
12755                 if (hnet) {
12756                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
12757                             (struct sockaddr *)&hnet->ro._l_addr);
12758                 } else {
12759                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
12760                 }
12761 #endif
12762                 /* update the timer now */
12763                 hnet->last_sent_time = *now;
12764                 return (hnet);
12765         }
12766         /* Nothing to HB */
12767         return (NULL);
12768 }
12769 
12770 int
12771 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
12772 {
12773         struct sctp_tmit_chunk *chk;
12774         struct sctp_nets *net;
12775         struct sctp_heartbeat_chunk *hb;
12776         struct timeval now;
12777         struct sockaddr_in *sin;
12778         struct sockaddr_in6 *sin6;
12779 
12780         SCTP_TCB_LOCK_ASSERT(stcb);
12781         if (user_req == 0) {
12782                 net = sctp_select_hb_destination(stcb, &now);
12783                 if (net == NULL) {
12784                         /*-
12785                          * All our busy none to send to, just start the
12786                          * timer again.
12787                          */
12788                         if (stcb->asoc.state == 0) {
12789                                 return (0);
12790                         }
12791                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
12792                             stcb->sctp_ep,
12793                             stcb,
12794                             net);
12795                         return (0);
12796                 }
12797         } else {
12798                 net = u_net;
12799                 if (net == NULL) {
12800                         return (0);
12801                 }
12802                 (void)SCTP_GETTIME_TIMEVAL(&now);
12803         }
12804         sin = (struct sockaddr_in *)&net->ro._l_addr;
12805         if (sin->sin_family != AF_INET) {
12806                 if (sin->sin_family != AF_INET6) {
12807                         /* huh */
12808                         return (0);
12809                 }
12810         }
12811         sctp_alloc_a_chunk(stcb, chk);
12812         if (chk == NULL) {
12813                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
12814                 return (0);
12815         }
12816         chk->copy_by_ref = 0;
12817         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
12818         chk->rec.chunk_id.can_take_data = 1;
12819         chk->asoc = &stcb->asoc;
12820         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
12821 
12822         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
12823         if (chk->data == NULL) {
12824                 sctp_free_a_chunk(stcb, chk);
12825                 return (0);
12826         }
12827         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12828         SCTP_BUF_LEN(chk->data) = chk->send_size;
12829         chk->sent = SCTP_DATAGRAM_UNSENT;
12830         chk->snd_count = 0;
12831         chk->whoTo = net;
12832         atomic_add_int(&chk->whoTo->ref_count, 1);
12833         /* Now we have a mbuf that we can fill in with the details */
12834         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
12835         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
12836         /* fill out chunk header */
12837         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
12838         hb->ch.chunk_flags = 0;
12839         hb->ch.chunk_length = htons(chk->send_size);
12840         /* Fill out hb parameter */
12841         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
12842         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
12843         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
12844         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
12845         /* Did our user request this one, put it in */
12846         hb->heartbeat.hb_info.user_req = user_req;
12847         hb->heartbeat.hb_info.addr_family = sin->sin_family;
12848         hb->heartbeat.hb_info.addr_len = sin->sin_len;
12849         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
12850                 /*
12851                  * we only take from the entropy pool if the address is not
12852                  * confirmed.
12853                  */
12854                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
12855                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
12856         } else {
12857                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
12858                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
12859         }
12860         if (sin->sin_family == AF_INET) {
12861                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
12862         } else if (sin->sin_family == AF_INET6) {
12863                 /* We leave the scope the way it is in our lookup table. */
12864                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
12865                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
12866         } else {
12867                 /* huh compiler bug */
12868                 return (0);
12869         }
12870 
12871         /*
12872          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
12873          * PF-heartbeats.  Because of this, threshold management is done by
12874          * the t3 timer handler, and does not need to be done upon the send
12875          * of a PF-heartbeat. If CMT PF is on and the destination to which a
12876          * heartbeat is being sent is in PF state, do NOT do threshold
12877          * management.
12878          */
12879         if ((SCTP_BASE_SYSCTL(sctp_cmt_pf) == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
12880                 /* ok we have a destination that needs a beat */
12881                 /* lets do the theshold management Qiaobing style */
12882                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
12883                     stcb->asoc.max_send_times)) {
12884                         /*-
12885                          * we have lost the association, in a way this is
12886                          * quite bad since we really are one less time since
12887                          * we really did not send yet. This is the down side
12888                          * to the Q's style as defined in the RFC and not my
12889                          * alternate style defined in the RFC.
12890                          */
12891                         if (chk->data != NULL) {
12892                                 sctp_m_freem(chk->data);
12893                                 chk->data = NULL;
12894                         }
12895                         /*
12896                          * Here we do NOT use the macro since the
12897                          * association is now gone.
12898                          */
12899                         if (chk->whoTo) {
12900                                 sctp_free_remote_addr(chk->whoTo);
12901                                 chk->whoTo = NULL;
12902                         }
12903                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
12904                         return (-1);
12905                 }
12906         }
12907         net->hb_responded = 0;
12908         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
12909         stcb->asoc.ctrl_queue_cnt++;
12910         SCTP_STAT_INCR(sctps_sendheartbeat);
12911         /*-
12912          * Call directly med level routine to put out the chunk. It will
12913          * always tumble out control chunks aka HB but it may even tumble
12914          * out data too.
12915          */
12916         return (1);
12917 }
12918 
12919 void
12920 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
12921     uint32_t high_tsn)
12922 {
12923         struct sctp_association *asoc;
12924         struct sctp_ecne_chunk *ecne;
12925         struct sctp_tmit_chunk *chk;
12926 
12927         asoc = &stcb->asoc;
12928         SCTP_TCB_LOCK_ASSERT(stcb);
12929         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
12930                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
12931                         /* found a previous ECN_ECHO update it if needed */
12932                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
12933                         ecne->tsn = htonl(high_tsn);
12934                         return;
12935                 }
12936         }
12937         /* nope could not find one to update so we must build one */
12938         sctp_alloc_a_chunk(stcb, chk);
12939         if (chk == NULL) {
12940                 return;
12941         }
12942         chk->copy_by_ref = 0;
12943         SCTP_STAT_INCR(sctps_sendecne);
12944         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
12945         chk->rec.chunk_id.can_take_data = 0;
12946         chk->asoc = &stcb->asoc;
12947         chk->send_size = sizeof(struct sctp_ecne_chunk);
12948         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
12949         if (chk->data == NULL) {
12950                 sctp_free_a_chunk(stcb, chk);
12951                 return;
12952         }
12953         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12954         SCTP_BUF_LEN(chk->data) = chk->send_size;
12955         chk->sent = SCTP_DATAGRAM_UNSENT;
12956         chk->snd_count = 0;
12957         chk->whoTo = net;
12958         atomic_add_int(&chk->whoTo->ref_count, 1);
12959         stcb->asoc.ecn_echo_cnt_onq++;
12960         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
12961         ecne->ch.chunk_type = SCTP_ECN_ECHO;
12962         ecne->ch.chunk_flags = 0;
12963         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
12964         ecne->tsn = htonl(high_tsn);
12965         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
12966         asoc->ctrl_queue_cnt++;
12967 }
12968 
12969 void
12970 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
12971     struct mbuf *m, int iphlen, int bad_crc)
12972 {
12973         struct sctp_association *asoc;
12974         struct sctp_pktdrop_chunk *drp;
12975         struct sctp_tmit_chunk *chk;
12976         uint8_t *datap;
12977         int len;
12978         int was_trunc = 0;
12979         struct ip *iph;
12980 
12981 #ifdef INET6
12982         struct ip6_hdr *ip6h;
12983 
12984 #endif
12985         int fullsz = 0, extra = 0;
12986         long spc;
12987         int offset;
12988         struct sctp_chunkhdr *ch, chunk_buf;
12989         unsigned int chk_length;
12990 
12991         if (!stcb) {
12992                 return;
12993         }
12994         asoc = &stcb->asoc;
12995         SCTP_TCB_LOCK_ASSERT(stcb);
12996         if (asoc->peer_supports_pktdrop == 0) {
12997                 /*-
12998                  * peer must declare support before I send one.
12999                  */
13000                 return;
13001         }
13002         if (stcb->sctp_socket == NULL) {
13003                 return;
13004         }
13005         sctp_alloc_a_chunk(stcb, chk);
13006         if (chk == NULL) {
13007                 return;
13008         }
13009         chk->copy_by_ref = 0;
13010         iph = mtod(m, struct ip *);
13011         if (iph == NULL) {
13012                 sctp_free_a_chunk(stcb, chk);
13013                 return;
13014         }
13015         switch (iph->ip_v) {
13016         case IPVERSION:
13017                 /* IPv4 */
13018                 len = chk->send_size = iph->ip_len;
13019                 break;
13020 #ifdef INET6
13021         case IPV6_VERSION >> 4:
13022                 /* IPv6 */
13023                 ip6h = mtod(m, struct ip6_hdr *);
13024                 len = chk->send_size = htons(ip6h->ip6_plen);
13025                 break;
13026 #endif
13027         default:
13028                 return;
13029         }
13030         /* Validate that we do not have an ABORT in here. */
13031         offset = iphlen + sizeof(struct sctphdr);
13032         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
13033             sizeof(*ch), (uint8_t *) & chunk_buf);
13034         while (ch != NULL) {
13035                 chk_length = ntohs(ch->chunk_length);
13036                 if (chk_length < sizeof(*ch)) {
13037                         /* break to abort land */
13038                         break;
13039                 }
13040                 switch (ch->chunk_type) {
13041                 case SCTP_PACKET_DROPPED:
13042                 case SCTP_ABORT_ASSOCIATION:
13043                         /*-
13044                          * we don't respond with an PKT-DROP to an ABORT
13045                          * or PKT-DROP
13046                          */
13047                         sctp_free_a_chunk(stcb, chk);
13048                         return;
13049                 default:
13050                         break;
13051                 }
13052                 offset += SCTP_SIZE32(chk_length);
13053                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
13054                     sizeof(*ch), (uint8_t *) & chunk_buf);
13055         }
13056 
13057         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
13058             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
13059                 /*
13060                  * only send 1 mtu worth, trim off the excess on the end.
13061                  */
13062                 fullsz = len - extra;
13063                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
13064                 was_trunc = 1;
13065         }
13066         chk->asoc = &stcb->asoc;
13067         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
13068         if (chk->data == NULL) {
13069 jump_out:
13070                 sctp_free_a_chunk(stcb, chk);
13071                 return;
13072         }
13073         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
13074         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
13075         if (drp == NULL) {
13076                 sctp_m_freem(chk->data);
13077                 chk->data = NULL;
13078                 goto jump_out;
13079         }
13080         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
13081             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
13082         chk->book_size_scale = 0;
13083         if (was_trunc) {
13084                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
13085                 drp->trunc_len = htons(fullsz);
13086                 /*
13087                  * Len is already adjusted to size minus overhead above take
13088                  * out the pkt_drop chunk itself from it.
13089                  */
13090                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
13091                 len = chk->send_size;
13092         } else {
13093                 /* no truncation needed */
13094                 drp->ch.chunk_flags = 0;
13095                 drp->trunc_len = htons(0);
13096         }
13097         if (bad_crc) {
13098                 drp->ch.chunk_flags |= SCTP_BADCRC;
13099         }
13100         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
13101         SCTP_BUF_LEN(chk->data) = chk->send_size;
13102         chk->sent = SCTP_DATAGRAM_UNSENT;
13103         chk->snd_count = 0;
13104         if (net) {
13105                 /* we should hit here */
13106                 chk->whoTo = net;
13107         } else {
13108                 chk->whoTo = asoc->primary_destination;
13109         }
13110         atomic_add_int(&chk->whoTo->ref_count, 1);
13111         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
13112         chk->rec.chunk_id.can_take_data = 1;
13113         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
13114         drp->ch.chunk_length = htons(chk->send_size);
13115         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
13116         if (spc < 0) {
13117                 spc = 0;
13118         }
13119         drp->bottle_bw = htonl(spc);
13120         if (asoc->my_rwnd) {
13121                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
13122                     asoc->size_on_all_streams +
13123                     asoc->my_rwnd_control_len +
13124                     stcb->sctp_socket->so_rcv.sb_cc);
13125         } else {
13126                 /*-
13127                  * If my rwnd is 0, possibly from mbuf depletion as well as
13128                  * space used, tell the peer there is NO space aka onq == bw
13129                  */
13130                 drp->current_onq = htonl(spc);
13131         }
13132         drp->reserved = 0;
13133         datap = drp->data;
13134         m_copydata(m, iphlen, len, (caddr_t)datap);
13135         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
13136         asoc->ctrl_queue_cnt++;
13137 }
13138 
13139 void
13140 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
13141 {
13142         struct sctp_association *asoc;
13143         struct sctp_cwr_chunk *cwr;
13144         struct sctp_tmit_chunk *chk;
13145 
13146         asoc = &stcb->asoc;
13147         SCTP_TCB_LOCK_ASSERT(stcb);
13148         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
13149                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
13150                         /* found a previous ECN_CWR update it if needed */
13151                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
13152                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
13153                             MAX_TSN)) {
13154                                 cwr->tsn = htonl(high_tsn);
13155                         }
13156                         return;
13157                 }
13158         }
13159         /* nope could not find one to update so we must build one */
13160         sctp_alloc_a_chunk(stcb, chk);
13161         if (chk == NULL) {
13162                 return;
13163         }
13164         chk->copy_by_ref = 0;
13165         chk->rec.chunk_id.id = SCTP_ECN_CWR;
13166         chk->rec.chunk_id.can_take_data = 1;
13167         chk->asoc = &stcb->asoc;
13168         chk->send_size = sizeof(struct sctp_cwr_chunk);
13169         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
13170         if (chk->data == NULL) {
13171                 sctp_free_a_chunk(stcb, chk);
13172                 return;
13173         }
13174         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
13175         SCTP_BUF_LEN(chk->data) = chk->send_size;
13176         chk->sent = SCTP_DATAGRAM_UNSENT;
13177         chk->snd_count = 0;
13178         chk->whoTo = net;
13179         atomic_add_int(&chk->whoTo->ref_count, 1);
13180         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
13181         cwr->ch.chunk_type = SCTP_ECN_CWR;
13182         cwr->ch.chunk_flags = 0;
13183         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
13184         cwr->tsn = htonl(high_tsn);
13185         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
13186         asoc->ctrl_queue_cnt++;
13187 }
13188 
13189 void
13190 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
13191     int number_entries, uint16_t * list,
13192     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
13193 {
13194         int len, old_len, i;
13195         struct sctp_stream_reset_out_request *req_out;
13196         struct sctp_chunkhdr *ch;
13197 
13198         ch = mtod(chk->data, struct sctp_chunkhdr *);
13199 
13200 
13201         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
13202 
13203         /* get to new offset for the param. */
13204         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
13205         /* now how long will this param be? */
13206         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
13207         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
13208         req_out->ph.param_length = htons(len);
13209         req_out->request_seq = htonl(seq);
13210         req_out->response_seq = htonl(resp_seq);
13211         req_out->send_reset_at_tsn = htonl(last_sent);
13212         if (number_entries) {
13213                 for (i = 0; i < number_entries; i++) {
13214                         req_out->list_of_streams[i] = htons(list[i]);
13215                 }
13216         }
13217         if (SCTP_SIZE32(len) > len) {
13218                 /*-
13219                  * Need to worry about the pad we may end up adding to the
13220                  * end. This is easy since the struct is either aligned to 4
13221                  * bytes or 2 bytes off.
13222                  */
13223                 req_out->list_of_streams[number_entries] = 0;
13224         }
13225         /* now fix the chunk length */
13226         ch->chunk_length = htons(len + old_len);
13227         chk->book_size = len + old_len;
13228         chk->book_size_scale = 0;
13229         chk->send_size = SCTP_SIZE32(chk->book_size);
13230         SCTP_BUF_LEN(chk->data) = chk->send_size;
13231         return;
13232 }
13233 
13234 
13235 void
13236 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
13237     int number_entries, uint16_t * list,
13238     uint32_t seq)
13239 {
13240         int len, old_len, i;
13241         struct sctp_stream_reset_in_request *req_in;
13242         struct sctp_chunkhdr *ch;
13243 
13244         ch = mtod(chk->data, struct sctp_chunkhdr *);
13245 
13246 
13247         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
13248 
13249         /* get to new offset for the param. */
13250         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
13251         /* now how long will this param be? */
13252         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
13253         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
13254         req_in->ph.param_length = htons(len);
13255         req_in->request_seq = htonl(seq);
13256         if (number_entries) {
13257                 for (i = 0; i < number_entries; i++) {
13258                         req_in->list_of_streams[i] = htons(list[i]);
13259                 }
13260         }
13261         if (SCTP_SIZE32(len) > len) {
13262                 /*-
13263                  * Need to worry about the pad we may end up adding to the
13264                  * end. This is easy since the struct is either aligned to 4
13265                  * bytes or 2 bytes off.
13266                  */
13267                 req_in->list_of_streams[number_entries] = 0;
13268         }
13269         /* now fix the chunk length */
13270         ch->chunk_length = htons(len + old_len);
13271         chk->book_size = len + old_len;
13272         chk->book_size_scale = 0;
13273         chk->send_size = SCTP_SIZE32(chk->book_size);
13274         SCTP_BUF_LEN(chk->data) = chk->send_size;
13275         return;
13276 }
13277 
13278 
13279 void
13280 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
13281     uint32_t seq)
13282 {
13283         int len, old_len;
13284         struct sctp_stream_reset_tsn_request *req_tsn;
13285         struct sctp_chunkhdr *ch;
13286 
13287         ch = mtod(chk->data, struct sctp_chunkhdr *);
13288 
13289 
13290         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
13291 
13292         /* get to new offset for the param. */
13293         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
13294         /* now how long will this param be? */
13295         len = sizeof(struct sctp_stream_reset_tsn_request);
13296         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
13297         req_tsn->ph.param_length = htons(len);
13298         req_tsn->request_seq = htonl(seq);
13299 
13300         /* now fix the chunk length */
13301         ch->chunk_length = htons(len + old_len);
13302         chk->send_size = len + old_len;
13303         chk->book_size = SCTP_SIZE32(chk->send_size);
13304         chk->book_size_scale = 0;
13305         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
13306         return;
13307 }
13308 
13309 void
13310 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
13311     uint32_t resp_seq, uint32_t result)
13312 {
13313         int len, old_len;
13314         struct sctp_stream_reset_response *resp;
13315         struct sctp_chunkhdr *ch;
13316 
13317         ch = mtod(chk->data, struct sctp_chunkhdr *);
13318 
13319 
13320         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
13321 
13322         /* get to new offset for the param. */
13323         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
13324         /* now how long will this param be? */
13325         len = sizeof(struct sctp_stream_reset_response);
13326         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
13327         resp->ph.param_length = htons(len);
13328         resp->response_seq = htonl(resp_seq);
13329         resp->result = ntohl(result);
13330 
13331         /* now fix the chunk length */
13332         ch->chunk_length = htons(len + old_len);
13333         chk->book_size = len + old_len;
13334         chk->book_size_scale = 0;
13335         chk->send_size = SCTP_SIZE32(chk->book_size);
13336         SCTP_BUF_LEN(chk->data) = chk->send_size;
13337         return;
13338 
13339 }
13340 
13341 
13342 void
13343 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
13344     uint32_t resp_seq, uint32_t result,
13345     uint32_t send_una, uint32_t recv_next)
13346 {
13347         int len, old_len;
13348         struct sctp_stream_reset_response_tsn *resp;
13349         struct sctp_chunkhdr *ch;
13350 
13351         ch = mtod(chk->data, struct sctp_chunkhdr *);
13352 
13353 
13354         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
13355 
13356         /* get to new offset for the param. */
13357         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
13358         /* now how long will this param be? */
13359         len = sizeof(struct sctp_stream_reset_response_tsn);
13360         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
13361         resp->ph.param_length = htons(len);
13362         resp->response_seq = htonl(resp_seq);
13363         resp->result = htonl(result);
13364         resp->senders_next_tsn = htonl(send_una);
13365         resp->receivers_next_tsn = htonl(recv_next);
13366 
13367         /* now fix the chunk length */
13368         ch->chunk_length = htons(len + old_len);
13369         chk->book_size = len + old_len;
13370         chk->send_size = SCTP_SIZE32(chk->book_size);
13371         chk->book_size_scale = 0;
13372         SCTP_BUF_LEN(chk->data) = chk->send_size;
13373         return;
13374 }
13375 
13376 
13377 int
13378 sctp_send_str_reset_req(struct sctp_tcb *stcb,
13379     int number_entries, uint16_t * list,
13380     uint8_t send_out_req, uint32_t resp_seq,
13381     uint8_t send_in_req,
13382     uint8_t send_tsn_req)
13383 {
13384 
13385         struct sctp_association *asoc;
13386         struct sctp_tmit_chunk *chk;
13387         struct sctp_chunkhdr *ch;
13388         uint32_t seq;
13389 
13390         asoc = &stcb->asoc;
13391         if (asoc->stream_reset_outstanding) {
13392                 /*-
13393                  * Already one pending, must get ACK back to clear the flag.
13394                  */
13395                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
13396                 return (EBUSY);
13397         }
13398         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
13399                 /* nothing to do */
13400                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13401                 return (EINVAL);
13402         }
13403         if (send_tsn_req && (send_out_req || send_in_req)) {
13404                 /* error, can't do that */
13405                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13406                 return (EINVAL);
13407         }
13408         sctp_alloc_a_chunk(stcb, chk);
13409         if (chk == NULL) {
13410                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13411                 return (ENOMEM);
13412         }
13413         chk->copy_by_ref = 0;
13414         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
13415         chk->rec.chunk_id.can_take_data = 0;
13416         chk->asoc = &stcb->asoc;
13417         chk->book_size = sizeof(struct sctp_chunkhdr);
13418         chk->send_size = SCTP_SIZE32(chk->book_size);
13419         chk->book_size_scale = 0;
13420 
13421         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
13422         if (chk->data == NULL) {
13423                 sctp_free_a_chunk(stcb, chk);
13424                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13425                 return (ENOMEM);
13426         }
13427         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
13428 
13429         /* setup chunk parameters */
13430         chk->sent = SCTP_DATAGRAM_UNSENT;
13431         chk->snd_count = 0;
13432         chk->whoTo = asoc->primary_destination;
13433         atomic_add_int(&chk->whoTo->ref_count, 1);
13434 
13435         ch = mtod(chk->data, struct sctp_chunkhdr *);
13436         ch->chunk_type = SCTP_STREAM_RESET;
13437         ch->chunk_flags = 0;
13438         ch->chunk_length = htons(chk->book_size);
13439         SCTP_BUF_LEN(chk->data) = chk->send_size;
13440 
13441         seq = stcb->asoc.str_reset_seq_out;
13442         if (send_out_req) {
13443                 sctp_add_stream_reset_out(chk, number_entries, list,
13444                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
13445                 asoc->stream_reset_out_is_outstanding = 1;
13446                 seq++;
13447                 asoc->stream_reset_outstanding++;
13448         }
13449         if (send_in_req) {
13450                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
13451                 asoc->stream_reset_outstanding++;
13452         }
13453         if (send_tsn_req) {
13454                 sctp_add_stream_reset_tsn(chk, seq);
13455                 asoc->stream_reset_outstanding++;
13456         }
13457         asoc->str_reset = chk;
13458 
13459         /* insert the chunk for sending */
13460         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
13461             chk,
13462             sctp_next);
13463         asoc->ctrl_queue_cnt++;
13464         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
13465         return (0);
13466 }
13467 
13468 void
13469 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
13470     struct mbuf *err_cause, uint32_t vrf_id, uint16_t port)
13471 {
13472         /*-
13473          * Formulate the abort message, and send it back down.
13474          */
13475         struct mbuf *o_pak;
13476         struct mbuf *mout;
13477         struct sctp_abort_msg *abm;
13478         struct ip *iph, *iph_out;
13479         struct udphdr *udp;
13480 
13481 #ifdef INET6
13482         struct ip6_hdr *ip6, *ip6_out;
13483 
13484 #endif
13485         int iphlen_out, len;
13486 
13487         /* don't respond to ABORT with ABORT */
13488         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
13489                 if (err_cause)
13490                         sctp_m_freem(err_cause);
13491                 return;
13492         }
13493         iph = mtod(m, struct ip *);
13494         switch (iph->ip_v) {
13495         case IPVERSION:
13496                 len = (sizeof(struct ip) + sizeof(struct sctp_abort_msg));
13497                 break;
13498 #ifdef INET6
13499         case IPV6_VERSION >> 4:
13500                 len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
13501                 break;
13502 #endif
13503         default:
13504                 return;
13505         }
13506         if (port) {
13507                 len += sizeof(struct udphdr);
13508         }
13509         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
13510         if (mout == NULL) {
13511                 if (err_cause)
13512                         sctp_m_freem(err_cause);
13513                 return;
13514         }
13515         SCTP_BUF_LEN(mout) = len;
13516         SCTP_BUF_NEXT(mout) = err_cause;
13517         iph_out = NULL;
13518 #ifdef INET6
13519         ip6_out = NULL;
13520 #endif
13521         switch (iph->ip_v) {
13522         case IPVERSION:
13523                 iph_out = mtod(mout, struct ip *);
13524 
13525                 /* Fill in the IP header for the ABORT */
13526                 iph_out->ip_v = IPVERSION;
13527                 iph_out->ip_hl = (sizeof(struct ip) / 4);
13528                 iph_out->ip_tos = (u_char)0;
13529                 iph_out->ip_id = 0;
13530                 iph_out->ip_off = 0;
13531                 iph_out->ip_ttl = MAXTTL;
13532                 if (port) {
13533                         iph_out->ip_p = IPPROTO_UDP;
13534                 } else {
13535                         iph_out->ip_p = IPPROTO_SCTP;
13536                 }
13537                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
13538                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
13539                 /* let IP layer calculate this */
13540                 iph_out->ip_sum = 0;
13541 
13542                 iphlen_out = sizeof(*iph_out);
13543                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
13544                 break;
13545 #ifdef INET6
13546         case IPV6_VERSION >> 4:
13547                 ip6 = (struct ip6_hdr *)iph;
13548                 ip6_out = mtod(mout, struct ip6_hdr *);
13549 
13550                 /* Fill in the IP6 header for the ABORT */
13551                 ip6_out->ip6_flow = ip6->ip6_flow;
13552                 ip6_out->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
13553                 if (port) {
13554                         ip6_out->ip6_nxt = IPPROTO_UDP;
13555                 } else {
13556                         ip6_out->ip6_nxt = IPPROTO_SCTP;
13557                 }
13558                 ip6_out->ip6_src = ip6->ip6_dst;
13559                 ip6_out->ip6_dst = ip6->ip6_src;
13560 
13561                 iphlen_out = sizeof(*ip6_out);
13562                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
13563                 break;
13564 #endif                          /* INET6 */
13565         default:
13566                 /* Currently not supported */
13567                 if (err_cause)
13568                         sctp_m_freem(err_cause);
13569                 sctp_m_freem(mout);
13570                 return;
13571         }
13572 
13573         udp = (struct udphdr *)abm;
13574         if (port) {
13575                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
13576                 udp->uh_dport = port;
13577                 /* set udp->uh_ulen later */
13578                 udp->uh_sum = 0;
13579                 iphlen_out += sizeof(struct udphdr);
13580                 abm = (struct sctp_abort_msg *)((caddr_t)abm + sizeof(struct udphdr));
13581         }
13582         abm->sh.src_port = sh->dest_port;
13583         abm->sh.dest_port = sh->src_port;
13584         abm->sh.checksum = 0;
13585         if (vtag == 0) {
13586                 abm->sh.v_tag = sh->v_tag;
13587                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
13588         } else {
13589                 abm->sh.v_tag = htonl(vtag);
13590                 abm->msg.ch.chunk_flags = 0;
13591         }
13592         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
13593 
13594         if (err_cause) {
13595                 struct mbuf *m_tmp = err_cause;
13596                 int err_len = 0;
13597 
13598                 /* get length of the err_cause chain */
13599                 while (m_tmp != NULL) {
13600                         err_len += SCTP_BUF_LEN(m_tmp);
13601                         m_tmp = SCTP_BUF_NEXT(m_tmp);
13602                 }
13603                 len = SCTP_BUF_LEN(mout) + err_len;
13604                 if (err_len % 4) {
13605                         /* need pad at end of chunk */
13606                         uint32_t cpthis = 0;
13607                         int padlen;
13608 
13609                         padlen = 4 - (len % 4);
13610                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
13611                         len += padlen;
13612                 }
13613                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
13614         } else {
13615                 len = SCTP_BUF_LEN(mout);
13616                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
13617         }
13618 
13619         /* add checksum */
13620         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
13621         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
13622                 /* no mbuf's */
13623                 sctp_m_freem(mout);
13624                 return;
13625         }
13626         if (iph_out != NULL) {
13627                 sctp_route_t ro;
13628                 struct sctp_tcb *stcb = NULL;
13629                 int ret;
13630 
13631                 /* zap the stack pointer to the route */
13632                 bzero(&ro, sizeof ro);
13633                 if (port) {
13634                         udp->uh_ulen = htons(len - sizeof(struct ip));
13635                         udp->uh_sum = in_pseudo(iph_out->ip_src.s_addr, iph_out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
13636                 }
13637                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
13638                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
13639                 /* set IPv4 length */
13640                 iph_out->ip_len = len;
13641                 /* out it goes */
13642 #ifdef  SCTP_PACKET_LOGGING
13643                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
13644                         sctp_packet_log(mout, len);
13645 #endif
13646                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
13647                 if (port) {
13648                         SCTP_ENABLE_UDP_CSUM(o_pak);
13649                 }
13650                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
13651 
13652                 /* Free the route if we got one back */
13653                 if (ro.ro_rt)
13654                         RTFREE(ro.ro_rt);
13655         }
13656 #ifdef INET6
13657         if (ip6_out != NULL) {
13658                 struct route_in6 ro;
13659                 int ret;
13660                 struct sctp_tcb *stcb = NULL;
13661                 struct ifnet *ifp = NULL;
13662 
13663                 /* zap the stack pointer to the route */
13664                 bzero(&ro, sizeof(ro));
13665                 if (port) {
13666                         udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
13667                 }
13668                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
13669                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
13670                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
13671 #ifdef  SCTP_PACKET_LOGGING
13672                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
13673                         sctp_packet_log(mout, len);
13674 #endif
13675                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
13676                 if (port) {
13677                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
13678                                 udp->uh_sum = 0xffff;
13679                         }
13680                 }
13681                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
13682 
13683                 /* Free the route if we got one back */
13684                 if (ro.ro_rt)
13685                         RTFREE(ro.ro_rt);
13686         }
13687 #endif
13688         SCTP_STAT_INCR(sctps_sendpackets);
13689         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
13690 }
13691 
13692 void
13693 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
13694     uint32_t vrf_id, uint16_t port)
13695 {
13696         struct mbuf *o_pak;
13697         struct sctphdr *ihdr;
13698         int retcode;
13699         struct sctphdr *ohdr;
13700         struct sctp_chunkhdr *ophdr;
13701         struct ip *iph;
13702         struct udphdr *udp = NULL;
13703         struct mbuf *mout;
13704 
13705 #ifdef INET6
13706 #ifdef SCTP_DEBUG
13707         struct sockaddr_in6 lsa6, fsa6;
13708 
13709 #endif
13710 #endif
13711         uint32_t val;
13712         struct mbuf *at;
13713         int len;
13714 
13715         iph = mtod(m, struct ip *);
13716         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
13717 
13718         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
13719         if (scm == NULL) {
13720                 /* can't send because we can't add a mbuf */
13721                 return;
13722         }
13723         ohdr = mtod(scm, struct sctphdr *);
13724         ohdr->src_port = ihdr->dest_port;
13725         ohdr->dest_port = ihdr->src_port;
13726         ohdr->v_tag = vtag;
13727         ohdr->checksum = 0;
13728         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
13729         ophdr->chunk_type = SCTP_OPERATION_ERROR;
13730         ophdr->chunk_flags = 0;
13731         len = 0;
13732         at = scm;
13733         while (at) {
13734                 len += SCTP_BUF_LEN(at);
13735                 at = SCTP_BUF_NEXT(at);
13736         }
13737         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
13738         if (len % 4) {
13739                 /* need padding */
13740                 uint32_t cpthis = 0;
13741                 int padlen;
13742 
13743                 padlen = 4 - (len % 4);
13744                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
13745                 len += padlen;
13746         }
13747         val = sctp_calculate_sum(scm, NULL, 0);
13748 #ifdef INET6
13749         if (port) {
13750                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
13751         } else {
13752                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
13753         }
13754 #else
13755         if (port) {
13756                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip) + sizeof(struct udphdr), 1, M_DONTWAIT, 1, MT_DATA);
13757         } else {
13758                 mout = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
13759         }
13760 #endif
13761         if (mout == NULL) {
13762                 sctp_m_freem(scm);
13763                 return;
13764         }
13765         SCTP_BUF_NEXT(mout) = scm;
13766         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
13767                 sctp_m_freem(mout);
13768                 return;
13769         }
13770         ohdr->checksum = val;
13771         switch (iph->ip_v) {
13772         case IPVERSION:
13773                 {
13774                         /* V4 */
13775                         struct ip *out;
13776                         sctp_route_t ro;
13777                         struct sctp_tcb *stcb = NULL;
13778 
13779                         SCTP_BUF_LEN(mout) = sizeof(struct ip);
13780                         len += sizeof(struct ip);
13781                         if (port) {
13782                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
13783                                 len += sizeof(struct udphdr);
13784                         }
13785                         bzero(&ro, sizeof ro);
13786                         out = mtod(mout, struct ip *);
13787                         out->ip_v = iph->ip_v;
13788                         out->ip_hl = (sizeof(struct ip) / 4);
13789                         out->ip_tos = iph->ip_tos;
13790                         out->ip_id = iph->ip_id;
13791                         out->ip_off = 0;
13792                         out->ip_ttl = MAXTTL;
13793                         if (port) {
13794                                 out->ip_p = IPPROTO_UDP;
13795                         } else {
13796                                 out->ip_p = IPPROTO_SCTP;
13797                         }
13798                         out->ip_sum = 0;
13799                         out->ip_src = iph->ip_dst;
13800                         out->ip_dst = iph->ip_src;
13801                         out->ip_len = len;
13802                         if (port) {
13803                                 udp = (struct udphdr *)(out + 1);
13804                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
13805                                 udp->uh_dport = port;
13806                                 udp->uh_ulen = htons(len - sizeof(struct ip));
13807                                 udp->uh_sum = in_pseudo(out->ip_src.s_addr, out->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
13808                         }
13809 #ifdef  SCTP_PACKET_LOGGING
13810                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
13811                                 sctp_packet_log(mout, len);
13812 #endif
13813                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
13814                         if (port) {
13815                                 SCTP_ENABLE_UDP_CSUM(o_pak);
13816                         }
13817                         SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
13818 
13819                         SCTP_STAT_INCR(sctps_sendpackets);
13820                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
13821                         /* Free the route if we got one back */
13822                         if (ro.ro_rt)
13823                                 RTFREE(ro.ro_rt);
13824                         break;
13825                 }
13826 #ifdef INET6
13827         case IPV6_VERSION >> 4:
13828                 {
13829                         /* V6 */
13830                         struct route_in6 ro;
13831                         int ret;
13832                         struct sctp_tcb *stcb = NULL;
13833                         struct ifnet *ifp = NULL;
13834                         struct ip6_hdr *out6, *in6;
13835 
13836                         SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
13837                         len += sizeof(struct ip6_hdr);
13838                         bzero(&ro, sizeof ro);
13839                         if (port) {
13840                                 SCTP_BUF_LEN(mout) += sizeof(struct udphdr);
13841                                 len += sizeof(struct udphdr);
13842                         }
13843                         in6 = mtod(m, struct ip6_hdr *);
13844                         out6 = mtod(mout, struct ip6_hdr *);
13845                         out6->ip6_flow = in6->ip6_flow;
13846                         out6->ip6_hlim = MODULE_GLOBAL(MOD_INET6, ip6_defhlim);
13847                         if (port) {
13848                                 out6->ip6_nxt = IPPROTO_UDP;
13849                         } else {
13850                                 out6->ip6_nxt = IPPROTO_SCTP;
13851                         }
13852                         out6->ip6_src = in6->ip6_dst;
13853                         out6->ip6_dst = in6->ip6_src;
13854                         out6->ip6_plen = len - sizeof(struct ip6_hdr);
13855                         if (port) {
13856                                 udp = (struct udphdr *)(out6 + 1);
13857                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
13858                                 udp->uh_dport = port;
13859                                 udp->uh_ulen = htons(len - sizeof(struct ip6_hdr));
13860                                 udp->uh_sum = 0;
13861                         }
13862 #ifdef SCTP_DEBUG
13863                         bzero(&lsa6, sizeof(lsa6));
13864                         lsa6.sin6_len = sizeof(lsa6);
13865                         lsa6.sin6_family = AF_INET6;
13866                         lsa6.sin6_addr = out6->ip6_src;
13867                         bzero(&fsa6, sizeof(fsa6));
13868                         fsa6.sin6_len = sizeof(fsa6);
13869                         fsa6.sin6_family = AF_INET6;
13870                         fsa6.sin6_addr = out6->ip6_dst;
13871 #endif
13872                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
13873                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
13874                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
13875                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
13876                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
13877 
13878 #ifdef  SCTP_PACKET_LOGGING
13879                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
13880                                 sctp_packet_log(mout, len);
13881 #endif
13882                         SCTP_ATTACH_CHAIN(o_pak, mout, len);
13883                         if (port) {
13884                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
13885                                         udp->uh_sum = 0xffff;
13886                                 }
13887                         }
13888                         SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
13889 
13890                         SCTP_STAT_INCR(sctps_sendpackets);
13891                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
13892                         /* Free the route if we got one back */
13893                         if (ro.ro_rt)
13894                                 RTFREE(ro.ro_rt);
13895                         break;
13896                 }
13897 #endif                          /* INET6 */
13898         default:
13899                 /* TSNH */
13900                 break;
13901         }
13902 }
13903 
13904 static struct mbuf *
13905 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
13906     struct uio *uio,
13907     struct sctp_sndrcvinfo *srcv,
13908     int max_send_len,
13909     int user_marks_eor,
13910     int *error,
13911     uint32_t * sndout,
13912     struct mbuf **new_tail)
13913 {
13914         struct mbuf *m;
13915 
13916         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
13917             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
13918         if (m == NULL) {
13919                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13920                 *error = ENOMEM;
13921         } else {
13922                 *sndout = m_length(m, NULL);
13923                 *new_tail = m_last(m);
13924         }
13925         return (m);
13926 }
13927 
13928 static int
13929 sctp_copy_one(struct sctp_stream_queue_pending *sp,
13930     struct uio *uio,
13931     int resv_upfront)
13932 {
13933         int left;
13934 
13935         left = sp->length;
13936         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
13937             resv_upfront, 0);
13938         if (sp->data == NULL) {
13939                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13940                 return (ENOMEM);
13941         }
13942         sp->tail_mbuf = m_last(sp->data);
13943         return (0);
13944 }
13945 
13946 
13947 
13948 static struct sctp_stream_queue_pending *
13949 sctp_copy_it_in(struct sctp_tcb *stcb,
13950     struct sctp_association *asoc,
13951     struct sctp_sndrcvinfo *srcv,
13952     struct uio *uio,
13953     struct sctp_nets *net,
13954     int max_send_len,
13955     int user_marks_eor,
13956     int *error,
13957     int non_blocking)
13958 {
13959         /*-
13960          * This routine must be very careful in its work. Protocol
13961          * processing is up and running so care must be taken to spl...()
13962          * when you need to do something that may effect the stcb/asoc. The
13963          * sb is locked however. When data is copied the protocol processing
13964          * should be enabled since this is a slower operation...
13965          */
13966         struct sctp_stream_queue_pending *sp = NULL;
13967         int resv_in_first;
13968 
13969         *error = 0;
13970         /* Now can we send this? */
13971         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
13972             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13973             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13974             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13975                 /* got data while shutting down */
13976                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13977                 *error = ECONNRESET;
13978                 goto out_now;
13979         }
13980         sctp_alloc_a_strmoq(stcb, sp);
13981         if (sp == NULL) {
13982                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
13983                 *error = ENOMEM;
13984                 goto out_now;
13985         }
13986         sp->act_flags = 0;
13987         sp->sender_all_done = 0;
13988         sp->sinfo_flags = srcv->sinfo_flags;
13989         sp->timetolive = srcv->sinfo_timetolive;
13990         sp->ppid = srcv->sinfo_ppid;
13991         sp->context = srcv->sinfo_context;
13992         sp->strseq = 0;
13993         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
13994 
13995         sp->stream = srcv->sinfo_stream;
13996         sp->length = min(uio->uio_resid, max_send_len);
13997         if ((sp->length == (uint32_t) uio->uio_resid) &&
13998             ((user_marks_eor == 0) ||
13999             (srcv->sinfo_flags & SCTP_EOF) ||
14000             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
14001                 sp->msg_is_complete = 1;
14002         } else {
14003                 sp->msg_is_complete = 0;
14004         }
14005         sp->sender_all_done = 0;
14006         sp->some_taken = 0;
14007         sp->put_last_out = 0;
14008         resv_in_first = sizeof(struct sctp_data_chunk);
14009         sp->data = sp->tail_mbuf = NULL;
14010         if (sp->length == 0) {
14011                 *error = 0;
14012                 goto skip_copy;
14013         }
14014         sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
14015         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
14016                 sctp_auth_key_acquire(stcb, stcb->asoc.authinfo.active_keyid);
14017                 sp->holds_key_ref = 1;
14018         }
14019         *error = sctp_copy_one(sp, uio, resv_in_first);
14020 skip_copy:
14021         if (*error) {
14022                 sctp_free_a_strmoq(stcb, sp);
14023                 sp = NULL;
14024         } else {
14025                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
14026                         sp->net = net;
14027                         sp->addr_over = 1;
14028                 } else {
14029                         sp->net = asoc->primary_destination;
14030                         sp->addr_over = 0;
14031                 }
14032                 atomic_add_int(&sp->net->ref_count, 1);
14033                 sctp_set_prsctp_policy(stcb, sp);
14034         }
14035 out_now:
14036         return (sp);
14037 }
14038 
14039 
14040 int
14041 sctp_sosend(struct socket *so,
14042     struct sockaddr *addr,
14043     struct uio *uio,
14044     struct mbuf *top,
14045     struct mbuf *control,
14046     int flags,
14047     struct thread *p
14048 )
14049 {
14050         struct sctp_inpcb *inp;
14051         int error, use_rcvinfo = 0;
14052         struct sctp_sndrcvinfo srcv;
14053         struct sockaddr *addr_to_use;
14054 
14055 #ifdef INET6
14056         struct sockaddr_in sin;
14057 
14058 #endif
14059 
14060         inp = (struct sctp_inpcb *)so->so_pcb;
14061         if (control) {
14062                 /* process cmsg snd/rcv info (maybe a assoc-id) */
14063                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
14064                     sizeof(srcv))) {
14065                         /* got one */
14066                         use_rcvinfo = 1;
14067                 }
14068         }
14069         addr_to_use = addr;
14070 #ifdef INET6
14071         if ((addr) && (addr->sa_family == AF_INET6)) {
14072                 struct sockaddr_in6 *sin6;
14073 
14074                 sin6 = (struct sockaddr_in6 *)addr;
14075                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
14076                         in6_sin6_2_sin(&sin, sin6);
14077                         addr_to_use = (struct sockaddr *)&sin;
14078                 }
14079         }
14080 #endif
14081         error = sctp_lower_sosend(so, addr_to_use, uio, top,
14082             control,
14083             flags,
14084             use_rcvinfo, &srcv
14085             ,p
14086             );
14087         return (error);
14088 }
14089 
14090 
14091 int
14092 sctp_lower_sosend(struct socket *so,
14093     struct sockaddr *addr,
14094     struct uio *uio,
14095     struct mbuf *i_pak,
14096     struct mbuf *control,
14097     int flags,
14098     int use_rcvinfo,
14099     struct sctp_sndrcvinfo *srcv
14100     ,
14101     struct thread *p
14102 )
14103 {
14104         unsigned int sndlen = 0, max_len;
14105         int error, len;
14106         struct mbuf *top = NULL;
14107 
14108         int queue_only = 0, queue_only_for_init = 0;
14109         int free_cnt_applied = 0;
14110         int un_sent = 0;
14111         int now_filled = 0;
14112         unsigned int inqueue_bytes = 0;
14113         struct sctp_block_entry be;
14114         struct sctp_inpcb *inp;
14115         struct sctp_tcb *stcb = NULL;
14116         struct timeval now;
14117         struct sctp_nets *net;
14118         struct sctp_association *asoc;
14119         struct sctp_inpcb *t_inp;
14120         int user_marks_eor;
14121         int create_lock_applied = 0;
14122         int nagle_applies = 0;
14123         int some_on_control = 0;
14124         int got_all_of_the_send = 0;
14125         int hold_tcblock = 0;
14126         int non_blocking = 0;
14127         int temp_flags = 0;
14128         uint32_t local_add_more, local_soresv = 0;
14129 
14130         error = 0;
14131         net = NULL;
14132         stcb = NULL;
14133         asoc = NULL;
14134 
14135         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
14136         if (inp == NULL) {
14137                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
14138                 error = EFAULT;
14139                 if (i_pak) {
14140                         SCTP_RELEASE_PKT(i_pak);
14141                 }
14142                 return (error);
14143         }
14144         if ((uio == NULL) && (i_pak == NULL)) {
14145                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14146                 return (EINVAL);
14147         }
14148         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
14149         atomic_add_int(&inp->total_sends, 1);
14150         if (uio) {
14151                 if (uio->uio_resid < 0) {
14152                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14153                         return (EINVAL);
14154                 }
14155                 sndlen = uio->uio_resid;
14156         } else {
14157                 top = SCTP_HEADER_TO_CHAIN(i_pak);
14158                 sndlen = SCTP_HEADER_LEN(i_pak);
14159         }
14160         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
14161             addr,
14162             sndlen);
14163         /*-
14164          * Pre-screen address, if one is given the sin-len
14165          * must be set correctly!
14166          */
14167         if (addr) {
14168                 if ((addr->sa_family == AF_INET) &&
14169                     (addr->sa_len != sizeof(struct sockaddr_in))) {
14170                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14171                         error = EINVAL;
14172                         goto out_unlocked;
14173                 } else if ((addr->sa_family == AF_INET6) &&
14174                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
14175                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14176                         error = EINVAL;
14177                         goto out_unlocked;
14178                 }
14179         }
14180         hold_tcblock = 0;
14181 
14182         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
14183             (inp->sctp_socket->so_qlimit)) {
14184                 /* The listener can NOT send */
14185                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
14186                 error = EFAULT;
14187                 goto out_unlocked;
14188         }
14189         if ((use_rcvinfo) && srcv) {
14190                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
14191                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
14192                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14193                         error = EINVAL;
14194                         goto out_unlocked;
14195                 }
14196                 if (srcv->sinfo_flags)
14197                         SCTP_STAT_INCR(sctps_sends_with_flags);
14198 
14199                 if (srcv->sinfo_flags & SCTP_SENDALL) {
14200                         /* its a sendall */
14201                         error = sctp_sendall(inp, uio, top, srcv);
14202                         top = NULL;
14203                         goto out_unlocked;
14204                 }
14205         }
14206         /* now we must find the assoc */
14207         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
14208             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
14209                 SCTP_INP_RLOCK(inp);
14210                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
14211                 if (stcb == NULL) {
14212                         SCTP_INP_RUNLOCK(inp);
14213                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
14214                         error = ENOTCONN;
14215                         goto out_unlocked;
14216                 }
14217                 hold_tcblock = 0;
14218                 SCTP_INP_RUNLOCK(inp);
14219                 if (addr) {
14220                         /* Must locate the net structure if addr given */
14221                         net = sctp_findnet(stcb, addr);
14222                         if (net) {
14223                                 /* validate port was 0 or correct */
14224                                 struct sockaddr_in *sin;
14225 
14226                                 sin = (struct sockaddr_in *)addr;
14227                                 if ((sin->sin_port != 0) &&
14228                                     (sin->sin_port != stcb->rport)) {
14229                                         net = NULL;
14230                                 }
14231                         }
14232                         temp_flags |= SCTP_ADDR_OVER;
14233                 } else
14234                         net = stcb->asoc.primary_destination;
14235                 if (addr && (net == NULL)) {
14236                         /* Could not find address, was it legal */
14237                         if (addr->sa_family == AF_INET) {
14238                                 struct sockaddr_in *sin;
14239 
14240                                 sin = (struct sockaddr_in *)addr;
14241                                 if (sin->sin_addr.s_addr == 0) {
14242                                         if ((sin->sin_port == 0) ||
14243                                             (sin->sin_port == stcb->rport)) {
14244                                                 net = stcb->asoc.primary_destination;
14245                                         }
14246                                 }
14247                         } else {
14248                                 struct sockaddr_in6 *sin6;
14249 
14250                                 sin6 = (struct sockaddr_in6 *)addr;
14251                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
14252                                         if ((sin6->sin6_port == 0) ||
14253                                             (sin6->sin6_port == stcb->rport)) {
14254                                                 net = stcb->asoc.primary_destination;
14255                                         }
14256                                 }
14257                         }
14258                 }
14259                 if (net == NULL) {
14260                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14261                         error = EINVAL;
14262                         goto out_unlocked;
14263                 }
14264         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
14265                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
14266                 if (stcb) {
14267                         if (addr)
14268                                 /*
14269                                  * Must locate the net structure if addr
14270                                  * given
14271                                  */
14272                                 net = sctp_findnet(stcb, addr);
14273                         else
14274                                 net = stcb->asoc.primary_destination;
14275                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
14276                             ((net == NULL) || (addr == NULL))) {
14277                                 struct sockaddr_in *sin;
14278 
14279                                 if (addr == NULL) {
14280                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14281                                         error = EINVAL;
14282                                         goto out_unlocked;
14283                                 }
14284                                 sin = (struct sockaddr_in *)addr;
14285                                 /* Validate port is 0 or correct */
14286                                 if ((sin->sin_port != 0) &&
14287                                     (sin->sin_port != stcb->rport)) {
14288                                         net = NULL;
14289                                 }
14290                         }
14291                 }
14292                 hold_tcblock = 0;
14293         } else if (addr) {
14294                 /*-
14295                  * Since we did not use findep we must
14296                  * increment it, and if we don't find a tcb
14297                  * decrement it.
14298                  */
14299                 SCTP_INP_WLOCK(inp);
14300                 SCTP_INP_INCR_REF(inp);
14301                 SCTP_INP_WUNLOCK(inp);
14302                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
14303                 if (stcb == NULL) {
14304                         SCTP_INP_WLOCK(inp);
14305                         SCTP_INP_DECR_REF(inp);
14306                         SCTP_INP_WUNLOCK(inp);
14307                 } else {
14308                         hold_tcblock = 1;
14309                 }
14310         }
14311         if ((stcb == NULL) && (addr)) {
14312                 /* Possible implicit send? */
14313                 SCTP_ASOC_CREATE_LOCK(inp);
14314                 create_lock_applied = 1;
14315                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
14316                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
14317                         /* Should I really unlock ? */
14318                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
14319                         error = EFAULT;
14320                         goto out_unlocked;
14321 
14322                 }
14323                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
14324                     (addr->sa_family == AF_INET6)) {
14325                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14326                         error = EINVAL;
14327                         goto out_unlocked;
14328                 }
14329                 SCTP_INP_WLOCK(inp);
14330                 SCTP_INP_INCR_REF(inp);
14331                 SCTP_INP_WUNLOCK(inp);
14332                 /* With the lock applied look again */
14333                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
14334                 if (stcb == NULL) {
14335                         SCTP_INP_WLOCK(inp);
14336                         SCTP_INP_DECR_REF(inp);
14337                         SCTP_INP_WUNLOCK(inp);
14338                 } else {
14339                         hold_tcblock = 1;
14340                 }
14341                 if (t_inp != inp) {
14342                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
14343                         error = ENOTCONN;
14344                         goto out_unlocked;
14345                 }
14346         }
14347         if (stcb == NULL) {
14348                 if (addr == NULL) {
14349                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
14350                         error = ENOENT;
14351                         goto out_unlocked;
14352                 } else {
14353                         /*
14354                          * UDP style, we must go ahead and start the INIT
14355                          * process
14356                          */
14357                         uint32_t vrf_id;
14358 
14359                         if ((use_rcvinfo) && (srcv) &&
14360                             ((srcv->sinfo_flags & SCTP_ABORT) ||
14361                             ((srcv->sinfo_flags & SCTP_EOF) &&
14362                             (sndlen == 0)))) {
14363                                 /*-
14364                                  * User asks to abort a non-existant assoc,
14365                                  * or EOF a non-existant assoc with no data
14366                                  */
14367                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
14368                                 error = ENOENT;
14369                                 goto out_unlocked;
14370                         }
14371                         /* get an asoc/stcb struct */
14372                         vrf_id = inp->def_vrf_id;
14373 #ifdef INVARIANTS
14374                         if (create_lock_applied == 0) {
14375                                 panic("Error, should hold create lock and I don't?");
14376                         }
14377 #endif
14378                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
14379                             p
14380                             );
14381                         if (stcb == NULL) {
14382                                 /* Error is setup for us in the call */
14383                                 goto out_unlocked;
14384                         }
14385                         if (create_lock_applied) {
14386                                 SCTP_ASOC_CREATE_UNLOCK(inp);
14387                                 create_lock_applied = 0;
14388                         } else {
14389                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
14390                         }
14391                         /*
14392                          * Turn on queue only flag to prevent data from
14393                          * being sent
14394                          */
14395                         queue_only = 1;
14396                         asoc = &stcb->asoc;
14397                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
14398                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
14399 
14400                         /* initialize authentication params for the assoc */
14401                         sctp_initialize_auth_params(inp, stcb);
14402 
14403                         if (control) {
14404                                 /*
14405                                  * see if a init structure exists in cmsg
14406                                  * headers
14407                                  */
14408                                 struct sctp_initmsg initm;
14409                                 int i;
14410 
14411                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
14412                                     sizeof(initm))) {
14413                                         /*
14414                                          * we have an INIT override of the
14415                                          * default
14416                                          */
14417                                         if (initm.sinit_max_attempts)
14418                                                 asoc->max_init_times = initm.sinit_max_attempts;
14419                                         if (initm.sinit_num_ostreams)
14420                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
14421                                         if (initm.sinit_max_instreams)
14422                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
14423                                         if (initm.sinit_max_init_timeo)
14424                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
14425                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
14426                                                 struct sctp_stream_out *tmp_str;
14427                                                 int had_lock = 0;
14428 
14429                                                 /* Default is NOT correct */
14430                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
14431                                                     asoc->streamoutcnt, asoc->pre_open_streams);
14432                                                 /*
14433                                                  * What happens if this
14434                                                  * fails? we panic ...
14435                                                  */
14436 
14437                                                 if (hold_tcblock) {
14438                                                         had_lock = 1;
14439                                                         SCTP_TCB_UNLOCK(stcb);
14440                                                 }
14441                                                 SCTP_MALLOC(tmp_str,
14442                                                     struct sctp_stream_out *,
14443                                                     (asoc->pre_open_streams *
14444                                                     sizeof(struct sctp_stream_out)),
14445                                                     SCTP_M_STRMO);
14446                                                 if (had_lock) {
14447                                                         SCTP_TCB_LOCK(stcb);
14448                                                 }
14449                                                 if (tmp_str != NULL) {
14450                                                         SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
14451                                                         asoc->strmout = tmp_str;
14452                                                         asoc->streamoutcnt = asoc->pre_open_streams;
14453                                                 } else {
14454                                                         asoc->pre_open_streams = asoc->streamoutcnt;
14455                                                 }
14456                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
14457                                                         /*-
14458                                                          * inbound side must be set
14459                                                          * to 0xffff, also NOTE when
14460                                                          * we get the INIT-ACK back
14461                                                          * (for INIT sender) we MUST
14462                                                          * reduce the count
14463                                                          * (streamoutcnt) but first
14464                                                          * check if we sent to any
14465                                                          * of the upper streams that
14466                                                          * were dropped (if some
14467                                                          * were). Those that were
14468                                                          * dropped must be notified
14469                                                          * to the upper layer as
14470                                                          * failed to send.
14471                                                          */
14472                                                         asoc->strmout[i].next_sequence_sent = 0x0;
14473                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
14474                                                         asoc->strmout[i].stream_no = i;
14475                                                         asoc->strmout[i].last_msg_incomplete = 0;
14476                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
14477                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
14478                                                 }
14479                                         }
14480                                 }
14481                         }
14482                         hold_tcblock = 1;
14483                         /* out with the INIT */
14484                         queue_only_for_init = 1;
14485                         /*-
14486                          * we may want to dig in after this call and adjust the MTU
14487                          * value. It defaulted to 1500 (constant) but the ro
14488                          * structure may now have an update and thus we may need to
14489                          * change it BEFORE we append the message.
14490                          */
14491                         net = stcb->asoc.primary_destination;
14492                         asoc = &stcb->asoc;
14493                 }
14494         }
14495         if ((SCTP_SO_IS_NBIO(so)
14496             || (flags & MSG_NBIO)
14497             )) {
14498                 non_blocking = 1;
14499         }
14500         asoc = &stcb->asoc;
14501         atomic_add_int(&stcb->total_sends, 1);
14502 
14503         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
14504                 if (sndlen > asoc->smallest_mtu) {
14505                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
14506                         error = EMSGSIZE;
14507                         goto out_unlocked;
14508                 }
14509         }
14510         /* would we block? */
14511         if (non_blocking) {
14512                 if (hold_tcblock == 0) {
14513                         SCTP_TCB_LOCK(stcb);
14514                         hold_tcblock = 1;
14515                 }
14516                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
14517                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
14518                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
14519                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
14520                         if (sndlen > SCTP_SB_LIMIT_SND(so))
14521                                 error = EMSGSIZE;
14522                         else
14523                                 error = EWOULDBLOCK;
14524                         goto out_unlocked;
14525                 }
14526                 stcb->asoc.sb_send_resv += sndlen;
14527                 SCTP_TCB_UNLOCK(stcb);
14528                 hold_tcblock = 0;
14529         } else {
14530                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
14531         }
14532         local_soresv = sndlen;
14533         /* Keep the stcb from being freed under our feet */
14534         if (free_cnt_applied) {
14535 #ifdef INVARIANTS
14536                 panic("refcnt already incremented");
14537 #else
14538                 printf("refcnt:1 already incremented?\n");
14539 #endif
14540         } else {
14541                 atomic_add_int(&stcb->asoc.refcnt, 1);
14542                 free_cnt_applied = 1;
14543         }
14544         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
14545                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
14546                 error = ECONNRESET;
14547                 goto out_unlocked;
14548         }
14549         if (create_lock_applied) {
14550                 SCTP_ASOC_CREATE_UNLOCK(inp);
14551                 create_lock_applied = 0;
14552         }
14553         if (asoc->stream_reset_outstanding) {
14554                 /*
14555                  * Can't queue any data while stream reset is underway.
14556                  */
14557                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
14558                 error = EAGAIN;
14559                 goto out_unlocked;
14560         }
14561         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
14562             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
14563                 queue_only = 1;
14564         }
14565         if ((use_rcvinfo == 0) || (srcv == NULL)) {
14566                 /* Grab the default stuff from the asoc */
14567                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
14568         }
14569         /* we are now done with all control */
14570         if (control) {
14571                 sctp_m_freem(control);
14572                 control = NULL;
14573         }
14574         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
14575             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
14576             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
14577             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
14578                 if ((use_rcvinfo) &&
14579                     (srcv->sinfo_flags & SCTP_ABORT)) {
14580                         ;
14581                 } else {
14582                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
14583                         error = ECONNRESET;
14584                         goto out_unlocked;
14585                 }
14586         }
14587         /* Ok, we will attempt a msgsnd :> */
14588         if (p) {
14589                 p->td_ru.ru_msgsnd++;
14590         }
14591         if (stcb) {
14592                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
14593                         net = stcb->asoc.primary_destination;
14594                 }
14595         }
14596         if (net == NULL) {
14597                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14598                 error = EINVAL;
14599                 goto out_unlocked;
14600         }
14601         if ((net->flight_size > net->cwnd) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
14602                 /*-
14603                  * CMT: Added check for CMT above. net above is the primary
14604                  * dest. If CMT is ON, sender should always attempt to send
14605                  * with the output routine sctp_fill_outqueue() that loops
14606                  * through all destination addresses. Therefore, if CMT is
14607                  * ON, queue_only is NOT set to 1 here, so that
14608                  * sctp_chunk_output() can be called below.
14609                  */
14610                 queue_only = 1;
14611         } else if (asoc->ifp_had_enobuf) {
14612                 SCTP_STAT_INCR(sctps_ifnomemqueued);
14613                 if (net->flight_size > (net->mtu * 2))
14614                         queue_only = 1;
14615                 asoc->ifp_had_enobuf = 0;
14616         } else {
14617                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
14618                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
14619         }
14620         /* Are we aborting? */
14621         if (srcv->sinfo_flags & SCTP_ABORT) {
14622                 struct mbuf *mm;
14623                 int tot_demand, tot_out = 0, max_out;
14624 
14625                 SCTP_STAT_INCR(sctps_sends_with_abort);
14626                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
14627                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
14628                         /* It has to be up before we abort */
14629                         /* how big is the user initiated abort? */
14630                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14631                         error = EINVAL;
14632                         goto out;
14633                 }
14634                 if (hold_tcblock) {
14635                         SCTP_TCB_UNLOCK(stcb);
14636                         hold_tcblock = 0;
14637                 }
14638                 if (top) {
14639                         struct mbuf *cntm = NULL;
14640 
14641                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
14642                         if (sndlen != 0) {
14643                                 cntm = top;
14644                                 while (cntm) {
14645                                         tot_out += SCTP_BUF_LEN(cntm);
14646                                         cntm = SCTP_BUF_NEXT(cntm);
14647                                 }
14648                         }
14649                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
14650                 } else {
14651                         /* Must fit in a MTU */
14652                         tot_out = sndlen;
14653                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
14654                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
14655                                 /* To big */
14656                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
14657                                 error = EMSGSIZE;
14658                                 goto out;
14659                         }
14660                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
14661                 }
14662                 if (mm == NULL) {
14663                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
14664                         error = ENOMEM;
14665                         goto out;
14666                 }
14667                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
14668                 max_out -= sizeof(struct sctp_abort_msg);
14669                 if (tot_out > max_out) {
14670                         tot_out = max_out;
14671                 }
14672                 if (mm) {
14673                         struct sctp_paramhdr *ph;
14674 
14675                         /* now move forward the data pointer */
14676                         ph = mtod(mm, struct sctp_paramhdr *);
14677                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
14678                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
14679                         ph++;
14680                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
14681                         if (top == NULL) {
14682                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
14683                                 if (error) {
14684                                         /*-
14685                                          * Here if we can't get his data we
14686                                          * still abort we just don't get to
14687                                          * send the users note :-0
14688                                          */
14689                                         sctp_m_freem(mm);
14690                                         mm = NULL;
14691                                 }
14692                         } else {
14693                                 if (sndlen != 0) {
14694                                         SCTP_BUF_NEXT(mm) = top;
14695                                 }
14696                         }
14697                 }
14698                 if (hold_tcblock == 0) {
14699                         SCTP_TCB_LOCK(stcb);
14700                         hold_tcblock = 1;
14701                 }
14702                 atomic_add_int(&stcb->asoc.refcnt, -1);
14703                 free_cnt_applied = 0;
14704                 /* release this lock, otherwise we hang on ourselves */
14705                 sctp_abort_an_association(stcb->sctp_ep, stcb,
14706                     SCTP_RESPONSE_TO_USER_REQ,
14707                     mm, SCTP_SO_LOCKED);
14708                 /* now relock the stcb so everything is sane */
14709                 hold_tcblock = 0;
14710                 stcb = NULL;
14711                 /*
14712                  * In this case top is already chained to mm avoid double
14713                  * free, since we free it below if top != NULL and driver
14714                  * would free it after sending the packet out
14715                  */
14716                 if (sndlen != 0) {
14717                         top = NULL;
14718                 }
14719                 goto out_unlocked;
14720         }
14721         /* Calculate the maximum we can send */
14722         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
14723         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
14724                 if (non_blocking) {
14725                         /* we already checked for non-blocking above. */
14726                         max_len = sndlen;
14727                 } else {
14728                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
14729                 }
14730         } else {
14731                 max_len = 0;
14732         }
14733         if (hold_tcblock) {
14734                 SCTP_TCB_UNLOCK(stcb);
14735                 hold_tcblock = 0;
14736         }
14737         /* Is the stream no. valid? */
14738         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
14739                 /* Invalid stream number */
14740                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14741                 error = EINVAL;
14742                 goto out_unlocked;
14743         }
14744         if (asoc->strmout == NULL) {
14745                 /* huh? software error */
14746                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
14747                 error = EFAULT;
14748                 goto out_unlocked;
14749         }
14750         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
14751         if ((user_marks_eor == 0) &&
14752             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
14753                 /* It will NEVER fit */
14754                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
14755                 error = EMSGSIZE;
14756                 goto out_unlocked;
14757         }
14758         if ((uio == NULL) && user_marks_eor) {
14759                 /*-
14760                  * We do not support eeor mode for
14761                  * sending with mbuf chains (like sendfile).
14762                  */
14763                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14764                 error = EINVAL;
14765                 goto out_unlocked;
14766         }
14767         if (user_marks_eor) {
14768                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
14769         } else {
14770                 /*-
14771                  * For non-eeor the whole message must fit in
14772                  * the socket send buffer.
14773                  */
14774                 local_add_more = sndlen;
14775         }
14776         len = 0;
14777         if (non_blocking) {
14778                 goto skip_preblock;
14779         }
14780         if (((max_len <= local_add_more) &&
14781             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
14782             (max_len == 0) ||
14783             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
14784                 /* No room right now ! */
14785                 SOCKBUF_LOCK(&so->so_snd);
14786                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
14787                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
14788                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
14789                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
14790                             (unsigned int)SCTP_SB_LIMIT_SND(so),
14791                             inqueue_bytes,
14792                             local_add_more,
14793                             stcb->asoc.stream_queue_cnt,
14794                             stcb->asoc.chunks_on_out_queue,
14795                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
14796                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
14797                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, so, asoc, sndlen);
14798                         }
14799                         be.error = 0;
14800                         stcb->block_entry = &be;
14801                         error = sbwait(&so->so_snd);
14802                         stcb->block_entry = NULL;
14803                         if (error || so->so_error || be.error) {
14804                                 if (error == 0) {
14805                                         if (so->so_error)
14806                                                 error = so->so_error;
14807                                         if (be.error) {
14808                                                 error = be.error;
14809                                         }
14810                                 }
14811                                 SOCKBUF_UNLOCK(&so->so_snd);
14812                                 goto out_unlocked;
14813                         }
14814                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
14815                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
14816                                     so, asoc, stcb->asoc.total_output_queue_size);
14817                         }
14818                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
14819                                 goto out_unlocked;
14820                         }
14821                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
14822                 }
14823                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
14824                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
14825                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
14826                 } else {
14827                         max_len = 0;
14828                 }
14829                 SOCKBUF_UNLOCK(&so->so_snd);
14830         }
14831 skip_preblock:
14832         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
14833                 goto out_unlocked;
14834         }
14835         /*
14836          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
14837          * case NOTE: uio will be null when top/mbuf is passed
14838          */
14839         if (sndlen == 0) {
14840                 if (srcv->sinfo_flags & SCTP_EOF) {
14841                         got_all_of_the_send = 1;
14842                         goto dataless_eof;
14843                 } else {
14844                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14845                         error = EINVAL;
14846                         goto out;
14847                 }
14848         }
14849         if (top == NULL) {
14850                 struct sctp_stream_queue_pending *sp;
14851                 struct sctp_stream_out *strm;
14852                 uint32_t sndout, initial_out;
14853 
14854                 initial_out = uio->uio_resid;
14855 
14856                 SCTP_TCB_SEND_LOCK(stcb);
14857                 if ((asoc->stream_locked) &&
14858                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
14859                         SCTP_TCB_SEND_UNLOCK(stcb);
14860                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
14861                         error = EINVAL;
14862                         goto out;
14863                 }
14864                 SCTP_TCB_SEND_UNLOCK(stcb);
14865 
14866                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
14867                 if (strm->last_msg_incomplete == 0) {
14868         do_a_copy_in:
14869                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
14870                         if ((sp == NULL) || (error)) {
14871                                 goto out;
14872                         }
14873                         SCTP_TCB_SEND_LOCK(stcb);
14874                         if (sp->msg_is_complete) {
14875                                 strm->last_msg_incomplete = 0;
14876                                 asoc->stream_locked = 0;
14877                         } else {
14878                                 /*
14879                                  * Just got locked to this guy in case of an
14880                                  * interrupt.
14881                                  */
14882                                 strm->last_msg_incomplete = 1;
14883                                 asoc->stream_locked = 1;
14884                                 asoc->stream_locked_on = srcv->sinfo_stream;
14885                                 sp->sender_all_done = 0;
14886                         }
14887                         sctp_snd_sb_alloc(stcb, sp->length);
14888                         atomic_add_int(&asoc->stream_queue_cnt, 1);
14889                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
14890                                 sp->strseq = strm->next_sequence_sent;
14891                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_SCTP) {
14892                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
14893                                             (uintptr_t) stcb, sp->length,
14894                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
14895                                 }
14896                                 strm->next_sequence_sent++;
14897                         } else {
14898                                 SCTP_STAT_INCR(sctps_sends_with_unord);
14899                         }
14900                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
14901                         if ((strm->next_spoke.tqe_next == NULL) &&
14902                             (strm->next_spoke.tqe_prev == NULL)) {
14903                                 /* Not on wheel, insert */
14904                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
14905                         }
14906                         SCTP_TCB_SEND_UNLOCK(stcb);
14907                 } else {
14908                         SCTP_TCB_SEND_LOCK(stcb);
14909                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
14910                         SCTP_TCB_SEND_UNLOCK(stcb);
14911                         if (sp == NULL) {
14912                                 /* ???? Huh ??? last msg is gone */
14913 #ifdef INVARIANTS
14914                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
14915 #else
14916                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
14917                                 strm->last_msg_incomplete = 0;
14918 #endif
14919                                 goto do_a_copy_in;
14920 
14921                         }
14922                 }
14923                 while (uio->uio_resid > 0) {
14924                         /* How much room do we have? */
14925                         struct mbuf *new_tail, *mm;
14926 
14927                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
14928                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
14929                         else
14930                                 max_len = 0;
14931 
14932                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
14933                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
14934                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
14935                                 sndout = 0;
14936                                 new_tail = NULL;
14937                                 if (hold_tcblock) {
14938                                         SCTP_TCB_UNLOCK(stcb);
14939                                         hold_tcblock = 0;
14940                                 }
14941                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
14942                                 if ((mm == NULL) || error) {
14943                                         if (mm) {
14944                                                 sctp_m_freem(mm);
14945                                         }
14946                                         goto out;
14947                                 }
14948                                 /* Update the mbuf and count */
14949                                 SCTP_TCB_SEND_LOCK(stcb);
14950                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
14951                                         /*
14952                                          * we need to get out. Peer probably
14953                                          * aborted.
14954                                          */
14955                                         sctp_m_freem(mm);
14956                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
14957                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
14958                                                 error = ECONNRESET;
14959                                         }
14960                                         SCTP_TCB_SEND_UNLOCK(stcb);
14961                                         goto out;
14962                                 }
14963                                 if (sp->tail_mbuf) {
14964                                         /* tack it to the end */
14965                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
14966                                         sp->tail_mbuf = new_tail;
14967                                 } else {
14968                                         /* A stolen mbuf */
14969                                         sp->data = mm;
14970                                         sp->tail_mbuf = new_tail;
14971                                 }
14972                                 sctp_snd_sb_alloc(stcb, sndout);
14973                                 atomic_add_int(&sp->length, sndout);
14974                                 len += sndout;
14975 
14976                                 /* Did we reach EOR? */
14977                                 if ((uio->uio_resid == 0) &&
14978                                     ((user_marks_eor == 0) ||
14979                                     (srcv->sinfo_flags & SCTP_EOF) ||
14980                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
14981                                         sp->msg_is_complete = 1;
14982                                 } else {
14983                                         sp->msg_is_complete = 0;
14984                                 }
14985                                 SCTP_TCB_SEND_UNLOCK(stcb);
14986                         }
14987                         if (uio->uio_resid == 0) {
14988                                 /* got it all? */
14989                                 continue;
14990                         }
14991                         /* PR-SCTP? */
14992                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
14993                                 /*
14994                                  * This is ugly but we must assure locking
14995                                  * order
14996                                  */
14997                                 if (hold_tcblock == 0) {
14998                                         SCTP_TCB_LOCK(stcb);
14999                                         hold_tcblock = 1;
15000                                 }
15001                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
15002                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
15003                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
15004                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
15005                                 else
15006                                         max_len = 0;
15007                                 if (max_len > 0) {
15008                                         continue;
15009                                 }
15010                                 SCTP_TCB_UNLOCK(stcb);
15011                                 hold_tcblock = 0;
15012                         }
15013                         /* wait for space now */
15014                         if (non_blocking) {
15015                                 /* Non-blocking io in place out */
15016                                 goto skip_out_eof;
15017                         }
15018                         if ((net->flight_size > net->cwnd) &&
15019                             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
15020                                 queue_only = 1;
15021                         } else if (asoc->ifp_had_enobuf) {
15022                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
15023                                 if (net->flight_size > (net->mtu * 2)) {
15024                                         queue_only = 1;
15025                                 } else {
15026                                         queue_only = 0;
15027                                 }
15028                                 asoc->ifp_had_enobuf = 0;
15029                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
15030                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
15031                         } else {
15032                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
15033                                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
15034                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
15035                                         queue_only = 1;
15036                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
15037                                 } else if (net->flight_size > net->cwnd) {
15038                                         queue_only = 1;
15039                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
15040                                 } else {
15041                                         queue_only = 0;
15042                                 }
15043                         }
15044                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
15045                             (stcb->asoc.total_flight > 0) &&
15046                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
15047                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
15048 
15049                                 /*-
15050                                  * Ok, Nagle is set on and we have data outstanding.
15051                                  * Don't send anything and let SACKs drive out the
15052                                  * data unless wen have a "full" segment to send.
15053                                  */
15054                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
15055                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
15056                                 }
15057                                 SCTP_STAT_INCR(sctps_naglequeued);
15058                                 nagle_applies = 1;
15059                         } else {
15060                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
15061                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
15062                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
15063                                 }
15064                                 SCTP_STAT_INCR(sctps_naglesent);
15065                                 nagle_applies = 0;
15066                         }
15067                         /* What about the INIT, send it maybe */
15068                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
15069 
15070                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
15071                                     nagle_applies, un_sent);
15072                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
15073                                     stcb->asoc.total_flight,
15074                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
15075                         }
15076                         if (queue_only_for_init) {
15077                                 if (hold_tcblock == 0) {
15078                                         SCTP_TCB_LOCK(stcb);
15079                                         hold_tcblock = 1;
15080                                 }
15081                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
15082                                         /* a collision took us forward? */
15083                                         queue_only_for_init = 0;
15084                                         queue_only = 0;
15085                                 } else {
15086                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
15087                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
15088                                         queue_only_for_init = 0;
15089                                         queue_only = 1;
15090                                 }
15091                         }
15092                         if ((queue_only == 0) && (nagle_applies == 0)) {
15093                                 /*-
15094                                  * need to start chunk output
15095                                  * before blocking.. note that if
15096                                  * a lock is already applied, then
15097                                  * the input via the net is happening
15098                                  * and I don't need to start output :-D
15099                                  */
15100                                 if (hold_tcblock == 0) {
15101                                         if (SCTP_TCB_TRYLOCK(stcb)) {
15102                                                 hold_tcblock = 1;
15103                                                 sctp_chunk_output(inp,
15104                                                     stcb,
15105                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
15106                                         }
15107                                 } else {
15108                                         sctp_chunk_output(inp,
15109                                             stcb,
15110                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
15111                                 }
15112                                 if (hold_tcblock == 1) {
15113                                         SCTP_TCB_UNLOCK(stcb);
15114                                         hold_tcblock = 0;
15115                                 }
15116                         }
15117                         SOCKBUF_LOCK(&so->so_snd);
15118                         /*-
15119                          * This is a bit strange, but I think it will
15120                          * work. The total_output_queue_size is locked and
15121                          * protected by the TCB_LOCK, which we just released.
15122                          * There is a race that can occur between releasing it
15123                          * above, and me getting the socket lock, where sacks
15124                          * come in but we have not put the SB_WAIT on the
15125                          * so_snd buffer to get the wakeup. After the LOCK
15126                          * is applied the sack_processing will also need to
15127                          * LOCK the so->so_snd to do the actual sowwakeup(). So
15128                          * once we have the socket buffer lock if we recheck the
15129                          * size we KNOW we will get to sleep safely with the
15130                          * wakeup flag in place.
15131                          */
15132                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
15133                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
15134                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
15135                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
15136                                             so, asoc, uio->uio_resid);
15137                                 }
15138                                 be.error = 0;
15139                                 stcb->block_entry = &be;
15140                                 error = sbwait(&so->so_snd);
15141                                 stcb->block_entry = NULL;
15142 
15143                                 if (error || so->so_error || be.error) {
15144                                         if (error == 0) {
15145                                                 if (so->so_error)
15146                                                         error = so->so_error;
15147                                                 if (be.error) {
15148                                                         error = be.error;
15149                                                 }
15150                                         }
15151                                         SOCKBUF_UNLOCK(&so->so_snd);
15152                                         goto out_unlocked;
15153                                 }
15154                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
15155                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
15156                                             so, asoc, stcb->asoc.total_output_queue_size);
15157                                 }
15158                         }
15159                         SOCKBUF_UNLOCK(&so->so_snd);
15160                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
15161                                 goto out_unlocked;
15162                         }
15163                 }
15164                 SCTP_TCB_SEND_LOCK(stcb);
15165                 if (sp) {
15166                         if (sp->msg_is_complete == 0) {
15167                                 strm->last_msg_incomplete = 1;
15168                                 asoc->stream_locked = 1;
15169                                 asoc->stream_locked_on = srcv->sinfo_stream;
15170                         } else {
15171                                 sp->sender_all_done = 1;
15172                                 strm->last_msg_incomplete = 0;
15173                                 asoc->stream_locked = 0;
15174                         }
15175                 } else {
15176                         SCTP_PRINTF("Huh no sp TSNH?\n");
15177                         strm->last_msg_incomplete = 0;
15178                         asoc->stream_locked = 0;
15179                 }
15180                 SCTP_TCB_SEND_UNLOCK(stcb);
15181                 if (uio->uio_resid == 0) {
15182                         got_all_of_the_send = 1;
15183                 }
15184         } else if (top) {
15185                 /* We send in a 0, since we do NOT have any locks */
15186                 error = sctp_msg_append(stcb, net, top, srcv, 0);
15187                 top = NULL;
15188                 if (srcv->sinfo_flags & SCTP_EOF) {
15189                         /*
15190                          * This should only happen for Panda for the mbuf
15191                          * send case, which does NOT yet support EEOR mode.
15192                          * Thus, we can just set this flag to do the proper
15193                          * EOF handling.
15194                          */
15195                         got_all_of_the_send = 1;
15196                 }
15197         }
15198         if (error) {
15199                 goto out;
15200         }
15201 dataless_eof:
15202         /* EOF thing ? */
15203         if ((srcv->sinfo_flags & SCTP_EOF) &&
15204             (got_all_of_the_send == 1) &&
15205             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
15206                 int cnt;
15207 
15208                 SCTP_STAT_INCR(sctps_sends_with_eof);
15209                 error = 0;
15210                 if (hold_tcblock == 0) {
15211                         SCTP_TCB_LOCK(stcb);
15212                         hold_tcblock = 1;
15213                 }
15214                 cnt = sctp_is_there_unsent_data(stcb);
15215                 if (TAILQ_EMPTY(&asoc->send_queue) &&
15216                     TAILQ_EMPTY(&asoc->sent_queue) &&
15217                     (cnt == 0)) {
15218                         if (asoc->locked_on_sending) {
15219                                 goto abort_anyway;
15220                         }
15221                         /* there is nothing queued to send, so I'm done... */
15222                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
15223                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
15224                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
15225                                 /* only send SHUTDOWN the first time through */
15226                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
15227                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
15228                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
15229                                 }
15230                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
15231                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
15232                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
15233                                     asoc->primary_destination);
15234                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
15235                                     asoc->primary_destination);
15236                         }
15237                 } else {
15238                         /*-
15239                          * we still got (or just got) data to send, so set
15240                          * SHUTDOWN_PENDING
15241                          */
15242                         /*-
15243                          * XXX sockets draft says that SCTP_EOF should be
15244                          * sent with no data.  currently, we will allow user
15245                          * data to be sent first and move to
15246                          * SHUTDOWN-PENDING
15247                          */
15248                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
15249                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
15250                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
15251                                 if (hold_tcblock == 0) {
15252                                         SCTP_TCB_LOCK(stcb);
15253                                         hold_tcblock = 1;
15254                                 }
15255                                 if (asoc->locked_on_sending) {
15256                                         /* Locked to send out the data */
15257                                         struct sctp_stream_queue_pending *sp;
15258 
15259                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
15260                                         if (sp) {
15261                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
15262                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
15263                                         }
15264                                 }
15265                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
15266                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
15267                                     TAILQ_EMPTY(&asoc->sent_queue) &&
15268                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
15269                         abort_anyway:
15270                                         if (free_cnt_applied) {
15271                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
15272                                                 free_cnt_applied = 0;
15273                                         }
15274                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
15275                                             SCTP_RESPONSE_TO_USER_REQ,
15276                                             NULL, SCTP_SO_LOCKED);
15277                                         /*
15278                                          * now relock the stcb so everything
15279                                          * is sane
15280                                          */
15281                                         hold_tcblock = 0;
15282                                         stcb = NULL;
15283                                         goto out;
15284                                 }
15285                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
15286                                     asoc->primary_destination);
15287                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
15288                         }
15289                 }
15290         }
15291 skip_out_eof:
15292         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
15293                 some_on_control = 1;
15294         }
15295         if ((net->flight_size > net->cwnd) &&
15296             (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) {
15297                 queue_only = 1;
15298         } else if (asoc->ifp_had_enobuf) {
15299                 SCTP_STAT_INCR(sctps_ifnomemqueued);
15300                 if (net->flight_size > (net->mtu * 2)) {
15301                         queue_only = 1;
15302                 } else {
15303                         queue_only = 0;
15304                 }
15305                 asoc->ifp_had_enobuf = 0;
15306                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
15307                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
15308         } else {
15309                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
15310                     (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
15311                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
15312                         queue_only = 1;
15313                         SCTP_STAT_INCR(sctps_send_burst_avoid);
15314                 } else if (net->flight_size > net->cwnd) {
15315                         queue_only = 1;
15316                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
15317                 } else {
15318                         queue_only = 0;
15319                 }
15320         }
15321         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
15322             (stcb->asoc.total_flight > 0) &&
15323             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
15324             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
15325                 /*-
15326                  * Ok, Nagle is set on and we have data outstanding.
15327                  * Don't send anything and let SACKs drive out the
15328                  * data unless wen have a "full" segment to send.
15329                  */
15330                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
15331                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
15332                 }
15333                 SCTP_STAT_INCR(sctps_naglequeued);
15334                 nagle_applies = 1;
15335         } else {
15336                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
15337                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
15338                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
15339                 }
15340                 SCTP_STAT_INCR(sctps_naglesent);
15341                 nagle_applies = 0;
15342         }
15343         if (queue_only_for_init) {
15344                 if (hold_tcblock == 0) {
15345                         SCTP_TCB_LOCK(stcb);
15346                         hold_tcblock = 1;
15347                 }
15348                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
15349                         /* a collision took us forward? */
15350                         queue_only_for_init = 0;
15351                         queue_only = 0;
15352                 } else {
15353                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
15354                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
15355                         queue_only_for_init = 0;
15356                         queue_only = 1;
15357                 }
15358         }
15359         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
15360                 /* we can attempt to send too. */
15361                 if (hold_tcblock == 0) {
15362                         /*
15363                          * If there is activity recv'ing sacks no need to
15364                          * send
15365                          */
15366                         if (SCTP_TCB_TRYLOCK(stcb)) {
15367                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
15368                                 hold_tcblock = 1;
15369                         }
15370                 } else {
15371                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
15372                 }
15373         } else if ((queue_only == 0) &&
15374                     (stcb->asoc.peers_rwnd == 0) &&
15375             (stcb->asoc.total_flight == 0)) {
15376                 /* We get to have a probe outstanding */
15377                 if (hold_tcblock == 0) {
15378                         hold_tcblock = 1;
15379                         SCTP_TCB_LOCK(stcb);
15380                 }
15381                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
15382         } else if (some_on_control) {
15383                 int num_out, reason, cwnd_full, frag_point;
15384 
15385                 /* Here we do control only */
15386                 if (hold_tcblock == 0) {
15387                         hold_tcblock = 1;
15388                         SCTP_TCB_LOCK(stcb);
15389                 }
15390                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
15391                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
15392                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
15393         }
15394         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
15395             queue_only, stcb->asoc.peers_rwnd, un_sent,
15396             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
15397             stcb->asoc.total_output_queue_size, error);
15398 
15399 out:
15400 out_unlocked:
15401 
15402         if (local_soresv && stcb) {
15403                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
15404                 local_soresv = 0;
15405         }
15406         if (create_lock_applied) {
15407                 SCTP_ASOC_CREATE_UNLOCK(inp);
15408                 create_lock_applied = 0;
15409         }
15410         if ((stcb) && hold_tcblock) {
15411                 SCTP_TCB_UNLOCK(stcb);
15412         }
15413         if (stcb && free_cnt_applied) {
15414                 atomic_add_int(&stcb->asoc.refcnt, -1);
15415         }
15416 #ifdef INVARIANTS
15417         if (stcb) {
15418                 if (mtx_owned(&stcb->tcb_mtx)) {
15419                         panic("Leaving with tcb mtx owned?");
15420                 }
15421                 if (mtx_owned(&stcb->tcb_send_mtx)) {
15422                         panic("Leaving with tcb send mtx owned?");
15423                 }
15424         }
15425 #endif
15426         if (top) {
15427                 sctp_m_freem(top);
15428         }
15429         if (control) {
15430                 sctp_m_freem(control);
15431         }
15432         return (error);
15433 }
15434 
15435 
15436 /*
15437  * generate an AUTHentication chunk, if required
15438  */
15439 struct mbuf *
15440 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
15441     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
15442     struct sctp_tcb *stcb, uint8_t chunk)
15443 {
15444         struct mbuf *m_auth;
15445         struct sctp_auth_chunk *auth;
15446         int chunk_len;
15447 
15448         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
15449             (stcb == NULL))
15450                 return (m);
15451 
15452         /* sysctl disabled auth? */
15453         if (SCTP_BASE_SYSCTL(sctp_auth_disable))
15454                 return (m);
15455 
15456         /* peer doesn't do auth... */
15457         if (!stcb->asoc.peer_supports_auth) {
15458                 return (m);
15459         }
15460         /* does the requested chunk require auth? */
15461         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
15462                 return (m);
15463         }
15464         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
15465         if (m_auth == NULL) {
15466                 /* no mbuf's */
15467                 return (m);
15468         }
15469         /* reserve some space if this will be the first mbuf */
15470         if (m == NULL)
15471                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
15472         /* fill in the AUTH chunk details */
15473         auth = mtod(m_auth, struct sctp_auth_chunk *);
15474         bzero(auth, sizeof(*auth));
15475         auth->ch.chunk_type = SCTP_AUTHENTICATION;
15476         auth->ch.chunk_flags = 0;
15477         chunk_len = sizeof(*auth) +
15478             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
15479         auth->ch.chunk_length = htons(chunk_len);
15480         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
15481         /* key id and hmac digest will be computed and filled in upon send */
15482 
15483         /* save the offset where the auth was inserted into the chain */
15484         if (m != NULL) {
15485                 struct mbuf *cn;
15486 
15487                 *offset = 0;
15488                 cn = m;
15489                 while (cn) {
15490                         *offset += SCTP_BUF_LEN(cn);
15491                         cn = SCTP_BUF_NEXT(cn);
15492                 }
15493         } else
15494                 *offset = 0;
15495 
15496         /* update length and return pointer to the auth chunk */
15497         SCTP_BUF_LEN(m_auth) = chunk_len;
15498         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
15499         if (auth_ret != NULL)
15500                 *auth_ret = auth;
15501 
15502         return (m);
15503 }
15504 
15505 #ifdef INET6
15506 int
15507 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
15508 {
15509         struct nd_prefix *pfx = NULL;
15510         struct nd_pfxrouter *pfxrtr = NULL;
15511         struct sockaddr_in6 gw6;
15512 
15513         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
15514                 return (0);
15515 
15516         /* get prefix entry of address */
15517         LIST_FOREACH(pfx, &MODULE_GLOBAL(MOD_INET6, nd_prefix), ndpr_entry) {
15518                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
15519                         continue;
15520                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
15521                     &src6->sin6_addr, &pfx->ndpr_mask))
15522                         break;
15523         }
15524         /* no prefix entry in the prefix list */
15525         if (pfx == NULL) {
15526                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
15527                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
15528                 return (0);
15529         }
15530         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
15531         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
15532 
15533         /* search installed gateway from prefix entry */
15534         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
15535             pfxrtr->pfr_next) {
15536                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
15537                 gw6.sin6_family = AF_INET6;
15538                 gw6.sin6_len = sizeof(struct sockaddr_in6);
15539                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
15540                     sizeof(struct in6_addr));
15541                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
15542                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
15543                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
15544                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
15545                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
15546                     ro->ro_rt->rt_gateway)) {
15547                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
15548                         return (1);
15549                 }
15550         }
15551         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
15552         return (0);
15553 }
15554 
15555 #endif
15556 
15557 int
15558 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
15559 {
15560         struct sockaddr_in *sin, *mask;
15561         struct ifaddr *ifa;
15562         struct in_addr srcnetaddr, gwnetaddr;
15563 
15564         if (ro == NULL || ro->ro_rt == NULL ||
15565             sifa->address.sa.sa_family != AF_INET) {
15566                 return (0);
15567         }
15568         ifa = (struct ifaddr *)sifa->ifa;
15569         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
15570         sin = (struct sockaddr_in *)&sifa->address.sin;
15571         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
15572         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
15573         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
15574         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
15575 
15576         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
15577         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
15578         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
15579         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
15580         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
15581         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
15582                 return (1);
15583         }
15584         return (0);
15585 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_output.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_output.c
