sctp_output.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/12.0/sys/netinet/sctp_output.c 339221 2018-10-07 15:13:47Z tuexen $");
   37 
   38 #include <netinet/sctp_os.h>
   39 #include <sys/proc.h>
   40 #include <netinet/sctp_var.h>
   41 #include <netinet/sctp_sysctl.h>
   42 #include <netinet/sctp_header.h>
   43 #include <netinet/sctp_pcb.h>
   44 #include <netinet/sctputil.h>
   45 #include <netinet/sctp_output.h>
   46 #include <netinet/sctp_uio.h>
   47 #include <netinet/sctputil.h>
   48 #include <netinet/sctp_auth.h>
   49 #include <netinet/sctp_timer.h>
   50 #include <netinet/sctp_asconf.h>
   51 #include <netinet/sctp_indata.h>
   52 #include <netinet/sctp_bsd_addr.h>
   53 #include <netinet/sctp_input.h>
   54 #include <netinet/sctp_crc32.h>
   55 #if defined(INET) || defined(INET6)
   56 #include <netinet/udp.h>
   57 #endif
   58 #include <netinet/udp_var.h>
   59 #include <machine/in_cksum.h>
   60 #include <netinet/in_kdtrace.h>
   61 
   62 
   63 
   64 #define SCTP_MAX_GAPS_INARRAY 4
   65 struct sack_track {
   66         uint8_t right_edge;     /* mergable on the right edge */
   67         uint8_t left_edge;      /* mergable on the left edge */
   68         uint8_t num_entries;
   69         uint8_t spare;
   70         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   71 };
   72 
   73 const struct sack_track sack_array[256] = {
   74         {0, 0, 0, 0,            /* 0x00 */
   75                 {{0, 0},
   76                 {0, 0},
   77                 {0, 0},
   78                 {0, 0}
   79                 }
   80         },
   81         {1, 0, 1, 0,            /* 0x01 */
   82                 {{0, 0},
   83                 {0, 0},
   84                 {0, 0},
   85                 {0, 0}
   86                 }
   87         },
   88         {0, 0, 1, 0,            /* 0x02 */
   89                 {{1, 1},
   90                 {0, 0},
   91                 {0, 0},
   92                 {0, 0}
   93                 }
   94         },
   95         {1, 0, 1, 0,            /* 0x03 */
   96                 {{0, 1},
   97                 {0, 0},
   98                 {0, 0},
   99                 {0, 0}
  100                 }
  101         },
  102         {0, 0, 1, 0,            /* 0x04 */
  103                 {{2, 2},
  104                 {0, 0},
  105                 {0, 0},
  106                 {0, 0}
  107                 }
  108         },
  109         {1, 0, 2, 0,            /* 0x05 */
  110                 {{0, 0},
  111                 {2, 2},
  112                 {0, 0},
  113                 {0, 0}
  114                 }
  115         },
  116         {0, 0, 1, 0,            /* 0x06 */
  117                 {{1, 2},
  118                 {0, 0},
  119                 {0, 0},
  120                 {0, 0}
  121                 }
  122         },
  123         {1, 0, 1, 0,            /* 0x07 */
  124                 {{0, 2},
  125                 {0, 0},
  126                 {0, 0},
  127                 {0, 0}
  128                 }
  129         },
  130         {0, 0, 1, 0,            /* 0x08 */
  131                 {{3, 3},
  132                 {0, 0},
  133                 {0, 0},
  134                 {0, 0}
  135                 }
  136         },
  137         {1, 0, 2, 0,            /* 0x09 */
  138                 {{0, 0},
  139                 {3, 3},
  140                 {0, 0},
  141                 {0, 0}
  142                 }
  143         },
  144         {0, 0, 2, 0,            /* 0x0a */
  145                 {{1, 1},
  146                 {3, 3},
  147                 {0, 0},
  148                 {0, 0}
  149                 }
  150         },
  151         {1, 0, 2, 0,            /* 0x0b */
  152                 {{0, 1},
  153                 {3, 3},
  154                 {0, 0},
  155                 {0, 0}
  156                 }
  157         },
  158         {0, 0, 1, 0,            /* 0x0c */
  159                 {{2, 3},
  160                 {0, 0},
  161                 {0, 0},
  162                 {0, 0}
  163                 }
  164         },
  165         {1, 0, 2, 0,            /* 0x0d */
  166                 {{0, 0},
  167                 {2, 3},
  168                 {0, 0},
  169                 {0, 0}
  170                 }
  171         },
  172         {0, 0, 1, 0,            /* 0x0e */
  173                 {{1, 3},
  174                 {0, 0},
  175                 {0, 0},
  176                 {0, 0}
  177                 }
  178         },
  179         {1, 0, 1, 0,            /* 0x0f */
  180                 {{0, 3},
  181                 {0, 0},
  182                 {0, 0},
  183                 {0, 0}
  184                 }
  185         },
  186         {0, 0, 1, 0,            /* 0x10 */
  187                 {{4, 4},
  188                 {0, 0},
  189                 {0, 0},
  190                 {0, 0}
  191                 }
  192         },
  193         {1, 0, 2, 0,            /* 0x11 */
  194                 {{0, 0},
  195                 {4, 4},
  196                 {0, 0},
  197                 {0, 0}
  198                 }
  199         },
  200         {0, 0, 2, 0,            /* 0x12 */
  201                 {{1, 1},
  202                 {4, 4},
  203                 {0, 0},
  204                 {0, 0}
  205                 }
  206         },
  207         {1, 0, 2, 0,            /* 0x13 */
  208                 {{0, 1},
  209                 {4, 4},
  210                 {0, 0},
  211                 {0, 0}
  212                 }
  213         },
  214         {0, 0, 2, 0,            /* 0x14 */
  215                 {{2, 2},
  216                 {4, 4},
  217                 {0, 0},
  218                 {0, 0}
  219                 }
  220         },
  221         {1, 0, 3, 0,            /* 0x15 */
  222                 {{0, 0},
  223                 {2, 2},
  224                 {4, 4},
  225                 {0, 0}
  226                 }
  227         },
  228         {0, 0, 2, 0,            /* 0x16 */
  229                 {{1, 2},
  230                 {4, 4},
  231                 {0, 0},
  232                 {0, 0}
  233                 }
  234         },
  235         {1, 0, 2, 0,            /* 0x17 */
  236                 {{0, 2},
  237                 {4, 4},
  238                 {0, 0},
  239                 {0, 0}
  240                 }
  241         },
  242         {0, 0, 1, 0,            /* 0x18 */
  243                 {{3, 4},
  244                 {0, 0},
  245                 {0, 0},
  246                 {0, 0}
  247                 }
  248         },
  249         {1, 0, 2, 0,            /* 0x19 */
  250                 {{0, 0},
  251                 {3, 4},
  252                 {0, 0},
  253                 {0, 0}
  254                 }
  255         },
  256         {0, 0, 2, 0,            /* 0x1a */
  257                 {{1, 1},
  258                 {3, 4},
  259                 {0, 0},
  260                 {0, 0}
  261                 }
  262         },
  263         {1, 0, 2, 0,            /* 0x1b */
  264                 {{0, 1},
  265                 {3, 4},
  266                 {0, 0},
  267                 {0, 0}
  268                 }
  269         },
  270         {0, 0, 1, 0,            /* 0x1c */
  271                 {{2, 4},
  272                 {0, 0},
  273                 {0, 0},
  274                 {0, 0}
  275                 }
  276         },
  277         {1, 0, 2, 0,            /* 0x1d */
  278                 {{0, 0},
  279                 {2, 4},
  280                 {0, 0},
  281                 {0, 0}
  282                 }
  283         },
  284         {0, 0, 1, 0,            /* 0x1e */
  285                 {{1, 4},
  286                 {0, 0},
  287                 {0, 0},
  288                 {0, 0}
  289                 }
  290         },
  291         {1, 0, 1, 0,            /* 0x1f */
  292                 {{0, 4},
  293                 {0, 0},
  294                 {0, 0},
  295                 {0, 0}
  296                 }
  297         },
  298         {0, 0, 1, 0,            /* 0x20 */
  299                 {{5, 5},
  300                 {0, 0},
  301                 {0, 0},
  302                 {0, 0}
  303                 }
  304         },
  305         {1, 0, 2, 0,            /* 0x21 */
  306                 {{0, 0},
  307                 {5, 5},
  308                 {0, 0},
  309                 {0, 0}
  310                 }
  311         },
  312         {0, 0, 2, 0,            /* 0x22 */
  313                 {{1, 1},
  314                 {5, 5},
  315                 {0, 0},
  316                 {0, 0}
  317                 }
  318         },
  319         {1, 0, 2, 0,            /* 0x23 */
  320                 {{0, 1},
  321                 {5, 5},
  322                 {0, 0},
  323                 {0, 0}
  324                 }
  325         },
  326         {0, 0, 2, 0,            /* 0x24 */
  327                 {{2, 2},
  328                 {5, 5},
  329                 {0, 0},
  330                 {0, 0}
  331                 }
  332         },
  333         {1, 0, 3, 0,            /* 0x25 */
  334                 {{0, 0},
  335                 {2, 2},
  336                 {5, 5},
  337                 {0, 0}
  338                 }
  339         },
  340         {0, 0, 2, 0,            /* 0x26 */
  341                 {{1, 2},
  342                 {5, 5},
  343                 {0, 0},
  344                 {0, 0}
  345                 }
  346         },
  347         {1, 0, 2, 0,            /* 0x27 */
  348                 {{0, 2},
  349                 {5, 5},
  350                 {0, 0},
  351                 {0, 0}
  352                 }
  353         },
  354         {0, 0, 2, 0,            /* 0x28 */
  355                 {{3, 3},
  356                 {5, 5},
  357                 {0, 0},
  358                 {0, 0}
  359                 }
  360         },
  361         {1, 0, 3, 0,            /* 0x29 */
  362                 {{0, 0},
  363                 {3, 3},
  364                 {5, 5},
  365                 {0, 0}
  366                 }
  367         },
  368         {0, 0, 3, 0,            /* 0x2a */
  369                 {{1, 1},
  370                 {3, 3},
  371                 {5, 5},
  372                 {0, 0}
  373                 }
  374         },
  375         {1, 0, 3, 0,            /* 0x2b */
  376                 {{0, 1},
  377                 {3, 3},
  378                 {5, 5},
  379                 {0, 0}
  380                 }
  381         },
  382         {0, 0, 2, 0,            /* 0x2c */
  383                 {{2, 3},
  384                 {5, 5},
  385                 {0, 0},
  386                 {0, 0}
  387                 }
  388         },
  389         {1, 0, 3, 0,            /* 0x2d */
  390                 {{0, 0},
  391                 {2, 3},
  392                 {5, 5},
  393                 {0, 0}
  394                 }
  395         },
  396         {0, 0, 2, 0,            /* 0x2e */
  397                 {{1, 3},
  398                 {5, 5},
  399                 {0, 0},
  400                 {0, 0}
  401                 }
  402         },
  403         {1, 0, 2, 0,            /* 0x2f */
  404                 {{0, 3},
  405                 {5, 5},
  406                 {0, 0},
  407                 {0, 0}
  408                 }
  409         },
  410         {0, 0, 1, 0,            /* 0x30 */
  411                 {{4, 5},
  412                 {0, 0},
  413                 {0, 0},
  414                 {0, 0}
  415                 }
  416         },
  417         {1, 0, 2, 0,            /* 0x31 */
  418                 {{0, 0},
  419                 {4, 5},
  420                 {0, 0},
  421                 {0, 0}
  422                 }
  423         },
  424         {0, 0, 2, 0,            /* 0x32 */
  425                 {{1, 1},
  426                 {4, 5},
  427                 {0, 0},
  428                 {0, 0}
  429                 }
  430         },
  431         {1, 0, 2, 0,            /* 0x33 */
  432                 {{0, 1},
  433                 {4, 5},
  434                 {0, 0},
  435                 {0, 0}
  436                 }
  437         },
  438         {0, 0, 2, 0,            /* 0x34 */
  439                 {{2, 2},
  440                 {4, 5},
  441                 {0, 0},
  442                 {0, 0}
  443                 }
  444         },
  445         {1, 0, 3, 0,            /* 0x35 */
  446                 {{0, 0},
  447                 {2, 2},
  448                 {4, 5},
  449                 {0, 0}
  450                 }
  451         },
  452         {0, 0, 2, 0,            /* 0x36 */
  453                 {{1, 2},
  454                 {4, 5},
  455                 {0, 0},
  456                 {0, 0}
  457                 }
  458         },
  459         {1, 0, 2, 0,            /* 0x37 */
  460                 {{0, 2},
  461                 {4, 5},
  462                 {0, 0},
  463                 {0, 0}
  464                 }
  465         },
  466         {0, 0, 1, 0,            /* 0x38 */
  467                 {{3, 5},
  468                 {0, 0},
  469                 {0, 0},
  470                 {0, 0}
  471                 }
  472         },
  473         {1, 0, 2, 0,            /* 0x39 */
  474                 {{0, 0},
  475                 {3, 5},
  476                 {0, 0},
  477                 {0, 0}
  478                 }
  479         },
  480         {0, 0, 2, 0,            /* 0x3a */
  481                 {{1, 1},
  482                 {3, 5},
  483                 {0, 0},
  484                 {0, 0}
  485                 }
  486         },
  487         {1, 0, 2, 0,            /* 0x3b */
  488                 {{0, 1},
  489                 {3, 5},
  490                 {0, 0},
  491                 {0, 0}
  492                 }
  493         },
  494         {0, 0, 1, 0,            /* 0x3c */
  495                 {{2, 5},
  496                 {0, 0},
  497                 {0, 0},
  498                 {0, 0}
  499                 }
  500         },
  501         {1, 0, 2, 0,            /* 0x3d */
  502                 {{0, 0},
  503                 {2, 5},
  504                 {0, 0},
  505                 {0, 0}
  506                 }
  507         },
  508         {0, 0, 1, 0,            /* 0x3e */
  509                 {{1, 5},
  510                 {0, 0},
  511                 {0, 0},
  512                 {0, 0}
  513                 }
  514         },
  515         {1, 0, 1, 0,            /* 0x3f */
  516                 {{0, 5},
  517                 {0, 0},
  518                 {0, 0},
  519                 {0, 0}
  520                 }
  521         },
  522         {0, 0, 1, 0,            /* 0x40 */
  523                 {{6, 6},
  524                 {0, 0},
  525                 {0, 0},
  526                 {0, 0}
  527                 }
  528         },
  529         {1, 0, 2, 0,            /* 0x41 */
  530                 {{0, 0},
  531                 {6, 6},
  532                 {0, 0},
  533                 {0, 0}
  534                 }
  535         },
  536         {0, 0, 2, 0,            /* 0x42 */
  537                 {{1, 1},
  538                 {6, 6},
  539                 {0, 0},
  540                 {0, 0}
  541                 }
  542         },
  543         {1, 0, 2, 0,            /* 0x43 */
  544                 {{0, 1},
  545                 {6, 6},
  546                 {0, 0},
  547                 {0, 0}
  548                 }
  549         },
  550         {0, 0, 2, 0,            /* 0x44 */
  551                 {{2, 2},
  552                 {6, 6},
  553                 {0, 0},
  554                 {0, 0}
  555                 }
  556         },
  557         {1, 0, 3, 0,            /* 0x45 */
  558                 {{0, 0},
  559                 {2, 2},
  560                 {6, 6},
  561                 {0, 0}
  562                 }
  563         },
  564         {0, 0, 2, 0,            /* 0x46 */
  565                 {{1, 2},
  566                 {6, 6},
  567                 {0, 0},
  568                 {0, 0}
  569                 }
  570         },
  571         {1, 0, 2, 0,            /* 0x47 */
  572                 {{0, 2},
  573                 {6, 6},
  574                 {0, 0},
  575                 {0, 0}
  576                 }
  577         },
  578         {0, 0, 2, 0,            /* 0x48 */
  579                 {{3, 3},
  580                 {6, 6},
  581                 {0, 0},
  582                 {0, 0}
  583                 }
  584         },
  585         {1, 0, 3, 0,            /* 0x49 */
  586                 {{0, 0},
  587                 {3, 3},
  588                 {6, 6},
  589                 {0, 0}
  590                 }
  591         },
  592         {0, 0, 3, 0,            /* 0x4a */
  593                 {{1, 1},
  594                 {3, 3},
  595                 {6, 6},
  596                 {0, 0}
  597                 }
  598         },
  599         {1, 0, 3, 0,            /* 0x4b */
  600                 {{0, 1},
  601                 {3, 3},
  602                 {6, 6},
  603                 {0, 0}
  604                 }
  605         },
  606         {0, 0, 2, 0,            /* 0x4c */
  607                 {{2, 3},
  608                 {6, 6},
  609                 {0, 0},
  610                 {0, 0}
  611                 }
  612         },
  613         {1, 0, 3, 0,            /* 0x4d */
  614                 {{0, 0},
  615                 {2, 3},
  616                 {6, 6},
  617                 {0, 0}
  618                 }
  619         },
  620         {0, 0, 2, 0,            /* 0x4e */
  621                 {{1, 3},
  622                 {6, 6},
  623                 {0, 0},
  624                 {0, 0}
  625                 }
  626         },
  627         {1, 0, 2, 0,            /* 0x4f */
  628                 {{0, 3},
  629                 {6, 6},
  630                 {0, 0},
  631                 {0, 0}
  632                 }
  633         },
  634         {0, 0, 2, 0,            /* 0x50 */
  635                 {{4, 4},
  636                 {6, 6},
  637                 {0, 0},
  638                 {0, 0}
  639                 }
  640         },
  641         {1, 0, 3, 0,            /* 0x51 */
  642                 {{0, 0},
  643                 {4, 4},
  644                 {6, 6},
  645                 {0, 0}
  646                 }
  647         },
  648         {0, 0, 3, 0,            /* 0x52 */
  649                 {{1, 1},
  650                 {4, 4},
  651                 {6, 6},
  652                 {0, 0}
  653                 }
  654         },
  655         {1, 0, 3, 0,            /* 0x53 */
  656                 {{0, 1},
  657                 {4, 4},
  658                 {6, 6},
  659                 {0, 0}
  660                 }
  661         },
  662         {0, 0, 3, 0,            /* 0x54 */
  663                 {{2, 2},
  664                 {4, 4},
  665                 {6, 6},
  666                 {0, 0}
  667                 }
  668         },
  669         {1, 0, 4, 0,            /* 0x55 */
  670                 {{0, 0},
  671                 {2, 2},
  672                 {4, 4},
  673                 {6, 6}
  674                 }
  675         },
  676         {0, 0, 3, 0,            /* 0x56 */
  677                 {{1, 2},
  678                 {4, 4},
  679                 {6, 6},
  680                 {0, 0}
  681                 }
  682         },
  683         {1, 0, 3, 0,            /* 0x57 */
  684                 {{0, 2},
  685                 {4, 4},
  686                 {6, 6},
  687                 {0, 0}
  688                 }
  689         },
  690         {0, 0, 2, 0,            /* 0x58 */
  691                 {{3, 4},
  692                 {6, 6},
  693                 {0, 0},
  694                 {0, 0}
  695                 }
  696         },
  697         {1, 0, 3, 0,            /* 0x59 */
  698                 {{0, 0},
  699                 {3, 4},
  700                 {6, 6},
  701                 {0, 0}
  702                 }
  703         },
  704         {0, 0, 3, 0,            /* 0x5a */
  705                 {{1, 1},
  706                 {3, 4},
  707                 {6, 6},
  708                 {0, 0}
  709                 }
  710         },
  711         {1, 0, 3, 0,            /* 0x5b */
  712                 {{0, 1},
  713                 {3, 4},
  714                 {6, 6},
  715                 {0, 0}
  716                 }
  717         },
  718         {0, 0, 2, 0,            /* 0x5c */
  719                 {{2, 4},
  720                 {6, 6},
  721                 {0, 0},
  722                 {0, 0}
  723                 }
  724         },
  725         {1, 0, 3, 0,            /* 0x5d */
  726                 {{0, 0},
  727                 {2, 4},
  728                 {6, 6},
  729                 {0, 0}
  730                 }
  731         },
  732         {0, 0, 2, 0,            /* 0x5e */
  733                 {{1, 4},
  734                 {6, 6},
  735                 {0, 0},
  736                 {0, 0}
  737                 }
  738         },
  739         {1, 0, 2, 0,            /* 0x5f */
  740                 {{0, 4},
  741                 {6, 6},
  742                 {0, 0},
  743                 {0, 0}
  744                 }
  745         },
  746         {0, 0, 1, 0,            /* 0x60 */
  747                 {{5, 6},
  748                 {0, 0},
  749                 {0, 0},
  750                 {0, 0}
  751                 }
  752         },
  753         {1, 0, 2, 0,            /* 0x61 */
  754                 {{0, 0},
  755                 {5, 6},
  756                 {0, 0},
  757                 {0, 0}
  758                 }
  759         },
  760         {0, 0, 2, 0,            /* 0x62 */
  761                 {{1, 1},
  762                 {5, 6},
  763                 {0, 0},
  764                 {0, 0}
  765                 }
  766         },
  767         {1, 0, 2, 0,            /* 0x63 */
  768                 {{0, 1},
  769                 {5, 6},
  770                 {0, 0},
  771                 {0, 0}
  772                 }
  773         },
  774         {0, 0, 2, 0,            /* 0x64 */
  775                 {{2, 2},
  776                 {5, 6},
  777                 {0, 0},
  778                 {0, 0}
  779                 }
  780         },
  781         {1, 0, 3, 0,            /* 0x65 */
  782                 {{0, 0},
  783                 {2, 2},
  784                 {5, 6},
  785                 {0, 0}
  786                 }
  787         },
  788         {0, 0, 2, 0,            /* 0x66 */
  789                 {{1, 2},
  790                 {5, 6},
  791                 {0, 0},
  792                 {0, 0}
  793                 }
  794         },
  795         {1, 0, 2, 0,            /* 0x67 */
  796                 {{0, 2},
  797                 {5, 6},
  798                 {0, 0},
  799                 {0, 0}
  800                 }
  801         },
  802         {0, 0, 2, 0,            /* 0x68 */
  803                 {{3, 3},
  804                 {5, 6},
  805                 {0, 0},
  806                 {0, 0}
  807                 }
  808         },
  809         {1, 0, 3, 0,            /* 0x69 */
  810                 {{0, 0},
  811                 {3, 3},
  812                 {5, 6},
  813                 {0, 0}
  814                 }
  815         },
  816         {0, 0, 3, 0,            /* 0x6a */
  817                 {{1, 1},
  818                 {3, 3},
  819                 {5, 6},
  820                 {0, 0}
  821                 }
  822         },
  823         {1, 0, 3, 0,            /* 0x6b */
  824                 {{0, 1},
  825                 {3, 3},
  826                 {5, 6},
  827                 {0, 0}
  828                 }
  829         },
  830         {0, 0, 2, 0,            /* 0x6c */
  831                 {{2, 3},
  832                 {5, 6},
  833                 {0, 0},
  834                 {0, 0}
  835                 }
  836         },
  837         {1, 0, 3, 0,            /* 0x6d */
  838                 {{0, 0},
  839                 {2, 3},
  840                 {5, 6},
  841                 {0, 0}
  842                 }
  843         },
  844         {0, 0, 2, 0,            /* 0x6e */
  845                 {{1, 3},
  846                 {5, 6},
  847                 {0, 0},
  848                 {0, 0}
  849                 }
  850         },
  851         {1, 0, 2, 0,            /* 0x6f */
  852                 {{0, 3},
  853                 {5, 6},
  854                 {0, 0},
  855                 {0, 0}
  856                 }
  857         },
  858         {0, 0, 1, 0,            /* 0x70 */
  859                 {{4, 6},
  860                 {0, 0},
  861                 {0, 0},
  862                 {0, 0}
  863                 }
  864         },
  865         {1, 0, 2, 0,            /* 0x71 */
  866                 {{0, 0},
  867                 {4, 6},
  868                 {0, 0},
  869                 {0, 0}
  870                 }
  871         },
  872         {0, 0, 2, 0,            /* 0x72 */
  873                 {{1, 1},
  874                 {4, 6},
  875                 {0, 0},
  876                 {0, 0}
  877                 }
  878         },
  879         {1, 0, 2, 0,            /* 0x73 */
  880                 {{0, 1},
  881                 {4, 6},
  882                 {0, 0},
  883                 {0, 0}
  884                 }
  885         },
  886         {0, 0, 2, 0,            /* 0x74 */
  887                 {{2, 2},
  888                 {4, 6},
  889                 {0, 0},
  890                 {0, 0}
  891                 }
  892         },
  893         {1, 0, 3, 0,            /* 0x75 */
  894                 {{0, 0},
  895                 {2, 2},
  896                 {4, 6},
  897                 {0, 0}
  898                 }
  899         },
  900         {0, 0, 2, 0,            /* 0x76 */
  901                 {{1, 2},
  902                 {4, 6},
  903                 {0, 0},
  904                 {0, 0}
  905                 }
  906         },
  907         {1, 0, 2, 0,            /* 0x77 */
  908                 {{0, 2},
  909                 {4, 6},
  910                 {0, 0},
  911                 {0, 0}
  912                 }
  913         },
  914         {0, 0, 1, 0,            /* 0x78 */
  915                 {{3, 6},
  916                 {0, 0},
  917                 {0, 0},
  918                 {0, 0}
  919                 }
  920         },
  921         {1, 0, 2, 0,            /* 0x79 */
  922                 {{0, 0},
  923                 {3, 6},
  924                 {0, 0},
  925                 {0, 0}
  926                 }
  927         },
  928         {0, 0, 2, 0,            /* 0x7a */
  929                 {{1, 1},
  930                 {3, 6},
  931                 {0, 0},
  932                 {0, 0}
  933                 }
  934         },
  935         {1, 0, 2, 0,            /* 0x7b */
  936                 {{0, 1},
  937                 {3, 6},
  938                 {0, 0},
  939                 {0, 0}
  940                 }
  941         },
  942         {0, 0, 1, 0,            /* 0x7c */
  943                 {{2, 6},
  944                 {0, 0},
  945                 {0, 0},
  946                 {0, 0}
  947                 }
  948         },
  949         {1, 0, 2, 0,            /* 0x7d */
  950                 {{0, 0},
  951                 {2, 6},
  952                 {0, 0},
  953                 {0, 0}
  954                 }
  955         },
  956         {0, 0, 1, 0,            /* 0x7e */
  957                 {{1, 6},
  958                 {0, 0},
  959                 {0, 0},
  960                 {0, 0}
  961                 }
  962         },
  963         {1, 0, 1, 0,            /* 0x7f */
  964                 {{0, 6},
  965                 {0, 0},
  966                 {0, 0},
  967                 {0, 0}
  968                 }
  969         },
  970         {0, 1, 1, 0,            /* 0x80 */
  971                 {{7, 7},
  972                 {0, 0},
  973                 {0, 0},
  974                 {0, 0}
  975                 }
  976         },
  977         {1, 1, 2, 0,            /* 0x81 */
  978                 {{0, 0},
  979                 {7, 7},
  980                 {0, 0},
  981                 {0, 0}
  982                 }
  983         },
  984         {0, 1, 2, 0,            /* 0x82 */
  985                 {{1, 1},
  986                 {7, 7},
  987                 {0, 0},
  988                 {0, 0}
  989                 }
  990         },
  991         {1, 1, 2, 0,            /* 0x83 */
  992                 {{0, 1},
  993                 {7, 7},
  994                 {0, 0},
  995                 {0, 0}
  996                 }
  997         },
  998         {0, 1, 2, 0,            /* 0x84 */
  999                 {{2, 2},
 1000                 {7, 7},
 1001                 {0, 0},
 1002                 {0, 0}
 1003                 }
 1004         },
 1005         {1, 1, 3, 0,            /* 0x85 */
 1006                 {{0, 0},
 1007                 {2, 2},
 1008                 {7, 7},
 1009                 {0, 0}
 1010                 }
 1011         },
 1012         {0, 1, 2, 0,            /* 0x86 */
 1013                 {{1, 2},
 1014                 {7, 7},
 1015                 {0, 0},
 1016                 {0, 0}
 1017                 }
 1018         },
 1019         {1, 1, 2, 0,            /* 0x87 */
 1020                 {{0, 2},
 1021                 {7, 7},
 1022                 {0, 0},
 1023                 {0, 0}
 1024                 }
 1025         },
 1026         {0, 1, 2, 0,            /* 0x88 */
 1027                 {{3, 3},
 1028                 {7, 7},
 1029                 {0, 0},
 1030                 {0, 0}
 1031                 }
 1032         },
 1033         {1, 1, 3, 0,            /* 0x89 */
 1034                 {{0, 0},
 1035                 {3, 3},
 1036                 {7, 7},
 1037                 {0, 0}
 1038                 }
 1039         },
 1040         {0, 1, 3, 0,            /* 0x8a */
 1041                 {{1, 1},
 1042                 {3, 3},
 1043                 {7, 7},
 1044                 {0, 0}
 1045                 }
 1046         },
 1047         {1, 1, 3, 0,            /* 0x8b */
 1048                 {{0, 1},
 1049                 {3, 3},
 1050                 {7, 7},
 1051                 {0, 0}
 1052                 }
 1053         },
 1054         {0, 1, 2, 0,            /* 0x8c */
 1055                 {{2, 3},
 1056                 {7, 7},
 1057                 {0, 0},
 1058                 {0, 0}
 1059                 }
 1060         },
 1061         {1, 1, 3, 0,            /* 0x8d */
 1062                 {{0, 0},
 1063                 {2, 3},
 1064                 {7, 7},
 1065                 {0, 0}
 1066                 }
 1067         },
 1068         {0, 1, 2, 0,            /* 0x8e */
 1069                 {{1, 3},
 1070                 {7, 7},
 1071                 {0, 0},
 1072                 {0, 0}
 1073                 }
 1074         },
 1075         {1, 1, 2, 0,            /* 0x8f */
 1076                 {{0, 3},
 1077                 {7, 7},
 1078                 {0, 0},
 1079                 {0, 0}
 1080                 }
 1081         },
 1082         {0, 1, 2, 0,            /* 0x90 */
 1083                 {{4, 4},
 1084                 {7, 7},
 1085                 {0, 0},
 1086                 {0, 0}
 1087                 }
 1088         },
 1089         {1, 1, 3, 0,            /* 0x91 */
 1090                 {{0, 0},
 1091                 {4, 4},
 1092                 {7, 7},
 1093                 {0, 0}
 1094                 }
 1095         },
 1096         {0, 1, 3, 0,            /* 0x92 */
 1097                 {{1, 1},
 1098                 {4, 4},
 1099                 {7, 7},
 1100                 {0, 0}
 1101                 }
 1102         },
 1103         {1, 1, 3, 0,            /* 0x93 */
 1104                 {{0, 1},
 1105                 {4, 4},
 1106                 {7, 7},
 1107                 {0, 0}
 1108                 }
 1109         },
 1110         {0, 1, 3, 0,            /* 0x94 */
 1111                 {{2, 2},
 1112                 {4, 4},
 1113                 {7, 7},
 1114                 {0, 0}
 1115                 }
 1116         },
 1117         {1, 1, 4, 0,            /* 0x95 */
 1118                 {{0, 0},
 1119                 {2, 2},
 1120                 {4, 4},
 1121                 {7, 7}
 1122                 }
 1123         },
 1124         {0, 1, 3, 0,            /* 0x96 */
 1125                 {{1, 2},
 1126                 {4, 4},
 1127                 {7, 7},
 1128                 {0, 0}
 1129                 }
 1130         },
 1131         {1, 1, 3, 0,            /* 0x97 */
 1132                 {{0, 2},
 1133                 {4, 4},
 1134                 {7, 7},
 1135                 {0, 0}
 1136                 }
 1137         },
 1138         {0, 1, 2, 0,            /* 0x98 */
 1139                 {{3, 4},
 1140                 {7, 7},
 1141                 {0, 0},
 1142                 {0, 0}
 1143                 }
 1144         },
 1145         {1, 1, 3, 0,            /* 0x99 */
 1146                 {{0, 0},
 1147                 {3, 4},
 1148                 {7, 7},
 1149                 {0, 0}
 1150                 }
 1151         },
 1152         {0, 1, 3, 0,            /* 0x9a */
 1153                 {{1, 1},
 1154                 {3, 4},
 1155                 {7, 7},
 1156                 {0, 0}
 1157                 }
 1158         },
 1159         {1, 1, 3, 0,            /* 0x9b */
 1160                 {{0, 1},
 1161                 {3, 4},
 1162                 {7, 7},
 1163                 {0, 0}
 1164                 }
 1165         },
 1166         {0, 1, 2, 0,            /* 0x9c */
 1167                 {{2, 4},
 1168                 {7, 7},
 1169                 {0, 0},
 1170                 {0, 0}
 1171                 }
 1172         },
 1173         {1, 1, 3, 0,            /* 0x9d */
 1174                 {{0, 0},
 1175                 {2, 4},
 1176                 {7, 7},
 1177                 {0, 0}
 1178                 }
 1179         },
 1180         {0, 1, 2, 0,            /* 0x9e */
 1181                 {{1, 4},
 1182                 {7, 7},
 1183                 {0, 0},
 1184                 {0, 0}
 1185                 }
 1186         },
 1187         {1, 1, 2, 0,            /* 0x9f */
 1188                 {{0, 4},
 1189                 {7, 7},
 1190                 {0, 0},
 1191                 {0, 0}
 1192                 }
 1193         },
 1194         {0, 1, 2, 0,            /* 0xa0 */
 1195                 {{5, 5},
 1196                 {7, 7},
 1197                 {0, 0},
 1198                 {0, 0}
 1199                 }
 1200         },
 1201         {1, 1, 3, 0,            /* 0xa1 */
 1202                 {{0, 0},
 1203                 {5, 5},
 1204                 {7, 7},
 1205                 {0, 0}
 1206                 }
 1207         },
 1208         {0, 1, 3, 0,            /* 0xa2 */
 1209                 {{1, 1},
 1210                 {5, 5},
 1211                 {7, 7},
 1212                 {0, 0}
 1213                 }
 1214         },
 1215         {1, 1, 3, 0,            /* 0xa3 */
 1216                 {{0, 1},
 1217                 {5, 5},
 1218                 {7, 7},
 1219                 {0, 0}
 1220                 }
 1221         },
 1222         {0, 1, 3, 0,            /* 0xa4 */
 1223                 {{2, 2},
 1224                 {5, 5},
 1225                 {7, 7},
 1226                 {0, 0}
 1227                 }
 1228         },
 1229         {1, 1, 4, 0,            /* 0xa5 */
 1230                 {{0, 0},
 1231                 {2, 2},
 1232                 {5, 5},
 1233                 {7, 7}
 1234                 }
 1235         },
 1236         {0, 1, 3, 0,            /* 0xa6 */
 1237                 {{1, 2},
 1238                 {5, 5},
 1239                 {7, 7},
 1240                 {0, 0}
 1241                 }
 1242         },
 1243         {1, 1, 3, 0,            /* 0xa7 */
 1244                 {{0, 2},
 1245                 {5, 5},
 1246                 {7, 7},
 1247                 {0, 0}
 1248                 }
 1249         },
 1250         {0, 1, 3, 0,            /* 0xa8 */
 1251                 {{3, 3},
 1252                 {5, 5},
 1253                 {7, 7},
 1254                 {0, 0}
 1255                 }
 1256         },
 1257         {1, 1, 4, 0,            /* 0xa9 */
 1258                 {{0, 0},
 1259                 {3, 3},
 1260                 {5, 5},
 1261                 {7, 7}
 1262                 }
 1263         },
 1264         {0, 1, 4, 0,            /* 0xaa */
 1265                 {{1, 1},
 1266                 {3, 3},
 1267                 {5, 5},
 1268                 {7, 7}
 1269                 }
 1270         },
 1271         {1, 1, 4, 0,            /* 0xab */
 1272                 {{0, 1},
 1273                 {3, 3},
 1274                 {5, 5},
 1275                 {7, 7}
 1276                 }
 1277         },
 1278         {0, 1, 3, 0,            /* 0xac */
 1279                 {{2, 3},
 1280                 {5, 5},
 1281                 {7, 7},
 1282                 {0, 0}
 1283                 }
 1284         },
 1285         {1, 1, 4, 0,            /* 0xad */
 1286                 {{0, 0},
 1287                 {2, 3},
 1288                 {5, 5},
 1289                 {7, 7}
 1290                 }
 1291         },
 1292         {0, 1, 3, 0,            /* 0xae */
 1293                 {{1, 3},
 1294                 {5, 5},
 1295                 {7, 7},
 1296                 {0, 0}
 1297                 }
 1298         },
 1299         {1, 1, 3, 0,            /* 0xaf */
 1300                 {{0, 3},
 1301                 {5, 5},
 1302                 {7, 7},
 1303                 {0, 0}
 1304                 }
 1305         },
 1306         {0, 1, 2, 0,            /* 0xb0 */
 1307                 {{4, 5},
 1308                 {7, 7},
 1309                 {0, 0},
 1310                 {0, 0}
 1311                 }
 1312         },
 1313         {1, 1, 3, 0,            /* 0xb1 */
 1314                 {{0, 0},
 1315                 {4, 5},
 1316                 {7, 7},
 1317                 {0, 0}
 1318                 }
 1319         },
 1320         {0, 1, 3, 0,            /* 0xb2 */
 1321                 {{1, 1},
 1322                 {4, 5},
 1323                 {7, 7},
 1324                 {0, 0}
 1325                 }
 1326         },
 1327         {1, 1, 3, 0,            /* 0xb3 */
 1328                 {{0, 1},
 1329                 {4, 5},
 1330                 {7, 7},
 1331                 {0, 0}
 1332                 }
 1333         },
 1334         {0, 1, 3, 0,            /* 0xb4 */
 1335                 {{2, 2},
 1336                 {4, 5},
 1337                 {7, 7},
 1338                 {0, 0}
 1339                 }
 1340         },
 1341         {1, 1, 4, 0,            /* 0xb5 */
 1342                 {{0, 0},
 1343                 {2, 2},
 1344                 {4, 5},
 1345                 {7, 7}
 1346                 }
 1347         },
 1348         {0, 1, 3, 0,            /* 0xb6 */
 1349                 {{1, 2},
 1350                 {4, 5},
 1351                 {7, 7},
 1352                 {0, 0}
 1353                 }
 1354         },
 1355         {1, 1, 3, 0,            /* 0xb7 */
 1356                 {{0, 2},
 1357                 {4, 5},
 1358                 {7, 7},
 1359                 {0, 0}
 1360                 }
 1361         },
 1362         {0, 1, 2, 0,            /* 0xb8 */
 1363                 {{3, 5},
 1364                 {7, 7},
 1365                 {0, 0},
 1366                 {0, 0}
 1367                 }
 1368         },
 1369         {1, 1, 3, 0,            /* 0xb9 */
 1370                 {{0, 0},
 1371                 {3, 5},
 1372                 {7, 7},
 1373                 {0, 0}
 1374                 }
 1375         },
 1376         {0, 1, 3, 0,            /* 0xba */
 1377                 {{1, 1},
 1378                 {3, 5},
 1379                 {7, 7},
 1380                 {0, 0}
 1381                 }
 1382         },
 1383         {1, 1, 3, 0,            /* 0xbb */
 1384                 {{0, 1},
 1385                 {3, 5},
 1386                 {7, 7},
 1387                 {0, 0}
 1388                 }
 1389         },
 1390         {0, 1, 2, 0,            /* 0xbc */
 1391                 {{2, 5},
 1392                 {7, 7},
 1393                 {0, 0},
 1394                 {0, 0}
 1395                 }
 1396         },
 1397         {1, 1, 3, 0,            /* 0xbd */
 1398                 {{0, 0},
 1399                 {2, 5},
 1400                 {7, 7},
 1401                 {0, 0}
 1402                 }
 1403         },
 1404         {0, 1, 2, 0,            /* 0xbe */
 1405                 {{1, 5},
 1406                 {7, 7},
 1407                 {0, 0},
 1408                 {0, 0}
 1409                 }
 1410         },
 1411         {1, 1, 2, 0,            /* 0xbf */
 1412                 {{0, 5},
 1413                 {7, 7},
 1414                 {0, 0},
 1415                 {0, 0}
 1416                 }
 1417         },
 1418         {0, 1, 1, 0,            /* 0xc0 */
 1419                 {{6, 7},
 1420                 {0, 0},
 1421                 {0, 0},
 1422                 {0, 0}
 1423                 }
 1424         },
 1425         {1, 1, 2, 0,            /* 0xc1 */
 1426                 {{0, 0},
 1427                 {6, 7},
 1428                 {0, 0},
 1429                 {0, 0}
 1430                 }
 1431         },
 1432         {0, 1, 2, 0,            /* 0xc2 */
 1433                 {{1, 1},
 1434                 {6, 7},
 1435                 {0, 0},
 1436                 {0, 0}
 1437                 }
 1438         },
 1439         {1, 1, 2, 0,            /* 0xc3 */
 1440                 {{0, 1},
 1441                 {6, 7},
 1442                 {0, 0},
 1443                 {0, 0}
 1444                 }
 1445         },
 1446         {0, 1, 2, 0,            /* 0xc4 */
 1447                 {{2, 2},
 1448                 {6, 7},
 1449                 {0, 0},
 1450                 {0, 0}
 1451                 }
 1452         },
 1453         {1, 1, 3, 0,            /* 0xc5 */
 1454                 {{0, 0},
 1455                 {2, 2},
 1456                 {6, 7},
 1457                 {0, 0}
 1458                 }
 1459         },
 1460         {0, 1, 2, 0,            /* 0xc6 */
 1461                 {{1, 2},
 1462                 {6, 7},
 1463                 {0, 0},
 1464                 {0, 0}
 1465                 }
 1466         },
 1467         {1, 1, 2, 0,            /* 0xc7 */
 1468                 {{0, 2},
 1469                 {6, 7},
 1470                 {0, 0},
 1471                 {0, 0}
 1472                 }
 1473         },
 1474         {0, 1, 2, 0,            /* 0xc8 */
 1475                 {{3, 3},
 1476                 {6, 7},
 1477                 {0, 0},
 1478                 {0, 0}
 1479                 }
 1480         },
 1481         {1, 1, 3, 0,            /* 0xc9 */
 1482                 {{0, 0},
 1483                 {3, 3},
 1484                 {6, 7},
 1485                 {0, 0}
 1486                 }
 1487         },
 1488         {0, 1, 3, 0,            /* 0xca */
 1489                 {{1, 1},
 1490                 {3, 3},
 1491                 {6, 7},
 1492                 {0, 0}
 1493                 }
 1494         },
 1495         {1, 1, 3, 0,            /* 0xcb */
 1496                 {{0, 1},
 1497                 {3, 3},
 1498                 {6, 7},
 1499                 {0, 0}
 1500                 }
 1501         },
 1502         {0, 1, 2, 0,            /* 0xcc */
 1503                 {{2, 3},
 1504                 {6, 7},
 1505                 {0, 0},
 1506                 {0, 0}
 1507                 }
 1508         },
 1509         {1, 1, 3, 0,            /* 0xcd */
 1510                 {{0, 0},
 1511                 {2, 3},
 1512                 {6, 7},
 1513                 {0, 0}
 1514                 }
 1515         },
 1516         {0, 1, 2, 0,            /* 0xce */
 1517                 {{1, 3},
 1518                 {6, 7},
 1519                 {0, 0},
 1520                 {0, 0}
 1521                 }
 1522         },
 1523         {1, 1, 2, 0,            /* 0xcf */
 1524                 {{0, 3},
 1525                 {6, 7},
 1526                 {0, 0},
 1527                 {0, 0}
 1528                 }
 1529         },
 1530         {0, 1, 2, 0,            /* 0xd0 */
 1531                 {{4, 4},
 1532                 {6, 7},
 1533                 {0, 0},
 1534                 {0, 0}
 1535                 }
 1536         },
 1537         {1, 1, 3, 0,            /* 0xd1 */
 1538                 {{0, 0},
 1539                 {4, 4},
 1540                 {6, 7},
 1541                 {0, 0}
 1542                 }
 1543         },
 1544         {0, 1, 3, 0,            /* 0xd2 */
 1545                 {{1, 1},
 1546                 {4, 4},
 1547                 {6, 7},
 1548                 {0, 0}
 1549                 }
 1550         },
 1551         {1, 1, 3, 0,            /* 0xd3 */
 1552                 {{0, 1},
 1553                 {4, 4},
 1554                 {6, 7},
 1555                 {0, 0}
 1556                 }
 1557         },
 1558         {0, 1, 3, 0,            /* 0xd4 */
 1559                 {{2, 2},
 1560                 {4, 4},
 1561                 {6, 7},
 1562                 {0, 0}
 1563                 }
 1564         },
 1565         {1, 1, 4, 0,            /* 0xd5 */
 1566                 {{0, 0},
 1567                 {2, 2},
 1568                 {4, 4},
 1569                 {6, 7}
 1570                 }
 1571         },
 1572         {0, 1, 3, 0,            /* 0xd6 */
 1573                 {{1, 2},
 1574                 {4, 4},
 1575                 {6, 7},
 1576                 {0, 0}
 1577                 }
 1578         },
 1579         {1, 1, 3, 0,            /* 0xd7 */
 1580                 {{0, 2},
 1581                 {4, 4},
 1582                 {6, 7},
 1583                 {0, 0}
 1584                 }
 1585         },
 1586         {0, 1, 2, 0,            /* 0xd8 */
 1587                 {{3, 4},
 1588                 {6, 7},
 1589                 {0, 0},
 1590                 {0, 0}
 1591                 }
 1592         },
 1593         {1, 1, 3, 0,            /* 0xd9 */
 1594                 {{0, 0},
 1595                 {3, 4},
 1596                 {6, 7},
 1597                 {0, 0}
 1598                 }
 1599         },
 1600         {0, 1, 3, 0,            /* 0xda */
 1601                 {{1, 1},
 1602                 {3, 4},
 1603                 {6, 7},
 1604                 {0, 0}
 1605                 }
 1606         },
 1607         {1, 1, 3, 0,            /* 0xdb */
 1608                 {{0, 1},
 1609                 {3, 4},
 1610                 {6, 7},
 1611                 {0, 0}
 1612                 }
 1613         },
 1614         {0, 1, 2, 0,            /* 0xdc */
 1615                 {{2, 4},
 1616                 {6, 7},
 1617                 {0, 0},
 1618                 {0, 0}
 1619                 }
 1620         },
 1621         {1, 1, 3, 0,            /* 0xdd */
 1622                 {{0, 0},
 1623                 {2, 4},
 1624                 {6, 7},
 1625                 {0, 0}
 1626                 }
 1627         },
 1628         {0, 1, 2, 0,            /* 0xde */
 1629                 {{1, 4},
 1630                 {6, 7},
 1631                 {0, 0},
 1632                 {0, 0}
 1633                 }
 1634         },
 1635         {1, 1, 2, 0,            /* 0xdf */
 1636                 {{0, 4},
 1637                 {6, 7},
 1638                 {0, 0},
 1639                 {0, 0}
 1640                 }
 1641         },
 1642         {0, 1, 1, 0,            /* 0xe0 */
 1643                 {{5, 7},
 1644                 {0, 0},
 1645                 {0, 0},
 1646                 {0, 0}
 1647                 }
 1648         },
 1649         {1, 1, 2, 0,            /* 0xe1 */
 1650                 {{0, 0},
 1651                 {5, 7},
 1652                 {0, 0},
 1653                 {0, 0}
 1654                 }
 1655         },
 1656         {0, 1, 2, 0,            /* 0xe2 */
 1657                 {{1, 1},
 1658                 {5, 7},
 1659                 {0, 0},
 1660                 {0, 0}
 1661                 }
 1662         },
 1663         {1, 1, 2, 0,            /* 0xe3 */
 1664                 {{0, 1},
 1665                 {5, 7},
 1666                 {0, 0},
 1667                 {0, 0}
 1668                 }
 1669         },
 1670         {0, 1, 2, 0,            /* 0xe4 */
 1671                 {{2, 2},
 1672                 {5, 7},
 1673                 {0, 0},
 1674                 {0, 0}
 1675                 }
 1676         },
 1677         {1, 1, 3, 0,            /* 0xe5 */
 1678                 {{0, 0},
 1679                 {2, 2},
 1680                 {5, 7},
 1681                 {0, 0}
 1682                 }
 1683         },
 1684         {0, 1, 2, 0,            /* 0xe6 */
 1685                 {{1, 2},
 1686                 {5, 7},
 1687                 {0, 0},
 1688                 {0, 0}
 1689                 }
 1690         },
 1691         {1, 1, 2, 0,            /* 0xe7 */
 1692                 {{0, 2},
 1693                 {5, 7},
 1694                 {0, 0},
 1695                 {0, 0}
 1696                 }
 1697         },
 1698         {0, 1, 2, 0,            /* 0xe8 */
 1699                 {{3, 3},
 1700                 {5, 7},
 1701                 {0, 0},
 1702                 {0, 0}
 1703                 }
 1704         },
 1705         {1, 1, 3, 0,            /* 0xe9 */
 1706                 {{0, 0},
 1707                 {3, 3},
 1708                 {5, 7},
 1709                 {0, 0}
 1710                 }
 1711         },
 1712         {0, 1, 3, 0,            /* 0xea */
 1713                 {{1, 1},
 1714                 {3, 3},
 1715                 {5, 7},
 1716                 {0, 0}
 1717                 }
 1718         },
 1719         {1, 1, 3, 0,            /* 0xeb */
 1720                 {{0, 1},
 1721                 {3, 3},
 1722                 {5, 7},
 1723                 {0, 0}
 1724                 }
 1725         },
 1726         {0, 1, 2, 0,            /* 0xec */
 1727                 {{2, 3},
 1728                 {5, 7},
 1729                 {0, 0},
 1730                 {0, 0}
 1731                 }
 1732         },
 1733         {1, 1, 3, 0,            /* 0xed */
 1734                 {{0, 0},
 1735                 {2, 3},
 1736                 {5, 7},
 1737                 {0, 0}
 1738                 }
 1739         },
 1740         {0, 1, 2, 0,            /* 0xee */
 1741                 {{1, 3},
 1742                 {5, 7},
 1743                 {0, 0},
 1744                 {0, 0}
 1745                 }
 1746         },
 1747         {1, 1, 2, 0,            /* 0xef */
 1748                 {{0, 3},
 1749                 {5, 7},
 1750                 {0, 0},
 1751                 {0, 0}
 1752                 }
 1753         },
 1754         {0, 1, 1, 0,            /* 0xf0 */
 1755                 {{4, 7},
 1756                 {0, 0},
 1757                 {0, 0},
 1758                 {0, 0}
 1759                 }
 1760         },
 1761         {1, 1, 2, 0,            /* 0xf1 */
 1762                 {{0, 0},
 1763                 {4, 7},
 1764                 {0, 0},
 1765                 {0, 0}
 1766                 }
 1767         },
 1768         {0, 1, 2, 0,            /* 0xf2 */
 1769                 {{1, 1},
 1770                 {4, 7},
 1771                 {0, 0},
 1772                 {0, 0}
 1773                 }
 1774         },
 1775         {1, 1, 2, 0,            /* 0xf3 */
 1776                 {{0, 1},
 1777                 {4, 7},
 1778                 {0, 0},
 1779                 {0, 0}
 1780                 }
 1781         },
 1782         {0, 1, 2, 0,            /* 0xf4 */
 1783                 {{2, 2},
 1784                 {4, 7},
 1785                 {0, 0},
 1786                 {0, 0}
 1787                 }
 1788         },
 1789         {1, 1, 3, 0,            /* 0xf5 */
 1790                 {{0, 0},
 1791                 {2, 2},
 1792                 {4, 7},
 1793                 {0, 0}
 1794                 }
 1795         },
 1796         {0, 1, 2, 0,            /* 0xf6 */
 1797                 {{1, 2},
 1798                 {4, 7},
 1799                 {0, 0},
 1800                 {0, 0}
 1801                 }
 1802         },
 1803         {1, 1, 2, 0,            /* 0xf7 */
 1804                 {{0, 2},
 1805                 {4, 7},
 1806                 {0, 0},
 1807                 {0, 0}
 1808                 }
 1809         },
 1810         {0, 1, 1, 0,            /* 0xf8 */
 1811                 {{3, 7},
 1812                 {0, 0},
 1813                 {0, 0},
 1814                 {0, 0}
 1815                 }
 1816         },
 1817         {1, 1, 2, 0,            /* 0xf9 */
 1818                 {{0, 0},
 1819                 {3, 7},
 1820                 {0, 0},
 1821                 {0, 0}
 1822                 }
 1823         },
 1824         {0, 1, 2, 0,            /* 0xfa */
 1825                 {{1, 1},
 1826                 {3, 7},
 1827                 {0, 0},
 1828                 {0, 0}
 1829                 }
 1830         },
 1831         {1, 1, 2, 0,            /* 0xfb */
 1832                 {{0, 1},
 1833                 {3, 7},
 1834                 {0, 0},
 1835                 {0, 0}
 1836                 }
 1837         },
 1838         {0, 1, 1, 0,            /* 0xfc */
 1839                 {{2, 7},
 1840                 {0, 0},
 1841                 {0, 0},
 1842                 {0, 0}
 1843                 }
 1844         },
 1845         {1, 1, 2, 0,            /* 0xfd */
 1846                 {{0, 0},
 1847                 {2, 7},
 1848                 {0, 0},
 1849                 {0, 0}
 1850                 }
 1851         },
 1852         {0, 1, 1, 0,            /* 0xfe */
 1853                 {{1, 7},
 1854                 {0, 0},
 1855                 {0, 0},
 1856                 {0, 0}
 1857                 }
 1858         },
 1859         {1, 1, 1, 0,            /* 0xff */
 1860                 {{0, 7},
 1861                 {0, 0},
 1862                 {0, 0},
 1863                 {0, 0}
 1864                 }
 1865         }
 1866 };
 1867 
 1868 
 1869 int
 1870 sctp_is_address_in_scope(struct sctp_ifa *ifa,
 1871     struct sctp_scoping *scope,
 1872     int do_update)
 1873 {
 1874         if ((scope->loopback_scope == 0) &&
 1875             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
 1876                 /*
 1877                  * skip loopback if not in scope *
 1878                  */
 1879                 return (0);
 1880         }
 1881         switch (ifa->address.sa.sa_family) {
 1882 #ifdef INET
 1883         case AF_INET:
 1884                 if (scope->ipv4_addr_legal) {
 1885                         struct sockaddr_in *sin;
 1886 
 1887                         sin = &ifa->address.sin;
 1888                         if (sin->sin_addr.s_addr == 0) {
 1889                                 /* not in scope , unspecified */
 1890                                 return (0);
 1891                         }
 1892                         if ((scope->ipv4_local_scope == 0) &&
 1893                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 1894                                 /* private address not in scope */
 1895                                 return (0);
 1896                         }
 1897                 } else {
 1898                         return (0);
 1899                 }
 1900                 break;
 1901 #endif
 1902 #ifdef INET6
 1903         case AF_INET6:
 1904                 if (scope->ipv6_addr_legal) {
 1905                         struct sockaddr_in6 *sin6;
 1906 
 1907                         /*
 1908                          * Must update the flags,  bummer, which means any
 1909                          * IFA locks must now be applied HERE <->
 1910                          */
 1911                         if (do_update) {
 1912                                 sctp_gather_internal_ifa_flags(ifa);
 1913                         }
 1914                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 1915                                 return (0);
 1916                         }
 1917                         /* ok to use deprecated addresses? */
 1918                         sin6 = &ifa->address.sin6;
 1919                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1920                                 /* skip unspecifed addresses */
 1921                                 return (0);
 1922                         }
 1923                         if (    /* (local_scope == 0) && */
 1924                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
 1925                                 return (0);
 1926                         }
 1927                         if ((scope->site_scope == 0) &&
 1928                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 1929                                 return (0);
 1930                         }
 1931                 } else {
 1932                         return (0);
 1933                 }
 1934                 break;
 1935 #endif
 1936         default:
 1937                 return (0);
 1938         }
 1939         return (1);
 1940 }
 1941 
 1942 static struct mbuf *
 1943 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
 1944 {
 1945 #if defined(INET) || defined(INET6)
 1946         struct sctp_paramhdr *paramh;
 1947         struct mbuf *mret;
 1948         uint16_t plen;
 1949 #endif
 1950 
 1951         switch (ifa->address.sa.sa_family) {
 1952 #ifdef INET
 1953         case AF_INET:
 1954                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
 1955                 break;
 1956 #endif
 1957 #ifdef INET6
 1958         case AF_INET6:
 1959                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
 1960                 break;
 1961 #endif
 1962         default:
 1963                 return (m);
 1964         }
 1965 #if defined(INET) || defined(INET6)
 1966         if (M_TRAILINGSPACE(m) >= plen) {
 1967                 /* easy side we just drop it on the end */
 1968                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
 1969                 mret = m;
 1970         } else {
 1971                 /* Need more space */
 1972                 mret = m;
 1973                 while (SCTP_BUF_NEXT(mret) != NULL) {
 1974                         mret = SCTP_BUF_NEXT(mret);
 1975                 }
 1976                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
 1977                 if (SCTP_BUF_NEXT(mret) == NULL) {
 1978                         /* We are hosed, can't add more addresses */
 1979                         return (m);
 1980                 }
 1981                 mret = SCTP_BUF_NEXT(mret);
 1982                 paramh = mtod(mret, struct sctp_paramhdr *);
 1983         }
 1984         /* now add the parameter */
 1985         switch (ifa->address.sa.sa_family) {
 1986 #ifdef INET
 1987         case AF_INET:
 1988                 {
 1989                         struct sctp_ipv4addr_param *ipv4p;
 1990                         struct sockaddr_in *sin;
 1991 
 1992                         sin = &ifa->address.sin;
 1993                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
 1994                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
 1995                         paramh->param_length = htons(plen);
 1996                         ipv4p->addr = sin->sin_addr.s_addr;
 1997                         SCTP_BUF_LEN(mret) += plen;
 1998                         break;
 1999                 }
 2000 #endif
 2001 #ifdef INET6
 2002         case AF_INET6:
 2003                 {
 2004                         struct sctp_ipv6addr_param *ipv6p;
 2005                         struct sockaddr_in6 *sin6;
 2006 
 2007                         sin6 = &ifa->address.sin6;
 2008                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
 2009                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
 2010                         paramh->param_length = htons(plen);
 2011                         memcpy(ipv6p->addr, &sin6->sin6_addr,
 2012                             sizeof(ipv6p->addr));
 2013                         /* clear embedded scope in the address */
 2014                         in6_clearscope((struct in6_addr *)ipv6p->addr);
 2015                         SCTP_BUF_LEN(mret) += plen;
 2016                         break;
 2017                 }
 2018 #endif
 2019         default:
 2020                 return (m);
 2021         }
 2022         if (len != NULL) {
 2023                 *len += plen;
 2024         }
 2025         return (mret);
 2026 #endif
 2027 }
 2028 
 2029 
 2030 struct mbuf *
 2031 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 2032     struct sctp_scoping *scope,
 2033     struct mbuf *m_at, int cnt_inits_to,
 2034     uint16_t *padding_len, uint16_t *chunk_len)
 2035 {
 2036         struct sctp_vrf *vrf = NULL;
 2037         int cnt, limit_out = 0, total_count;
 2038         uint32_t vrf_id;
 2039 
 2040         vrf_id = inp->def_vrf_id;
 2041         SCTP_IPI_ADDR_RLOCK();
 2042         vrf = sctp_find_vrf(vrf_id);
 2043         if (vrf == NULL) {
 2044                 SCTP_IPI_ADDR_RUNLOCK();
 2045                 return (m_at);
 2046         }
 2047         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 2048                 struct sctp_ifa *sctp_ifap;
 2049                 struct sctp_ifn *sctp_ifnp;
 2050 
 2051                 cnt = cnt_inits_to;
 2052                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 2053                         limit_out = 1;
 2054                         cnt = SCTP_ADDRESS_LIMIT;
 2055                         goto skip_count;
 2056                 }
 2057                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2058                         if ((scope->loopback_scope == 0) &&
 2059                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2060                                 /*
 2061                                  * Skip loopback devices if loopback_scope
 2062                                  * not set
 2063                                  */
 2064                                 continue;
 2065                         }
 2066                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2067 #ifdef INET
 2068                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2069                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2070                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
 2071                                         continue;
 2072                                 }
 2073 #endif
 2074 #ifdef INET6
 2075                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2076                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2077                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2078                                         continue;
 2079                                 }
 2080 #endif
 2081                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2082                                         continue;
 2083                                 }
 2084                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
 2085                                         continue;
 2086                                 }
 2087                                 cnt++;
 2088                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2089                                         break;
 2090                                 }
 2091                         }
 2092                         if (cnt > SCTP_ADDRESS_LIMIT) {
 2093                                 break;
 2094                         }
 2095                 }
 2096 skip_count:
 2097                 if (cnt > 1) {
 2098                         total_count = 0;
 2099                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2100                                 cnt = 0;
 2101                                 if ((scope->loopback_scope == 0) &&
 2102                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2103                                         /*
 2104                                          * Skip loopback devices if
 2105                                          * loopback_scope not set
 2106                                          */
 2107                                         continue;
 2108                                 }
 2109                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2110 #ifdef INET
 2111                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2112                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2113                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
 2114                                                 continue;
 2115                                         }
 2116 #endif
 2117 #ifdef INET6
 2118                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2119                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2120                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2121                                                 continue;
 2122                                         }
 2123 #endif
 2124                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2125                                                 continue;
 2126                                         }
 2127                                         if (sctp_is_address_in_scope(sctp_ifap,
 2128                                             scope, 0) == 0) {
 2129                                                 continue;
 2130                                         }
 2131                                         if ((chunk_len != NULL) &&
 2132                                             (padding_len != NULL) &&
 2133                                             (*padding_len > 0)) {
 2134                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2135                                                 SCTP_BUF_LEN(m_at) += *padding_len;
 2136                                                 *chunk_len += *padding_len;
 2137                                                 *padding_len = 0;
 2138                                         }
 2139                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
 2140                                         if (limit_out) {
 2141                                                 cnt++;
 2142                                                 total_count++;
 2143                                                 if (cnt >= 2) {
 2144                                                         /*
 2145                                                          * two from each
 2146                                                          * address
 2147                                                          */
 2148                                                         break;
 2149                                                 }
 2150                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 2151                                                         /* No more addresses */
 2152                                                         break;
 2153                                                 }
 2154                                         }
 2155                                 }
 2156                         }
 2157                 }
 2158         } else {
 2159                 struct sctp_laddr *laddr;
 2160 
 2161                 cnt = cnt_inits_to;
 2162                 /* First, how many ? */
 2163                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2164                         if (laddr->ifa == NULL) {
 2165                                 continue;
 2166                         }
 2167                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2168                                 /*
 2169                                  * Address being deleted by the system, dont
 2170                                  * list.
 2171                                  */
 2172                                 continue;
 2173                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2174                                 /*
 2175                                  * Address being deleted on this ep don't
 2176                                  * list.
 2177                                  */
 2178                                 continue;
 2179                         }
 2180                         if (sctp_is_address_in_scope(laddr->ifa,
 2181                             scope, 1) == 0) {
 2182                                 continue;
 2183                         }
 2184                         cnt++;
 2185                 }
 2186                 /*
 2187                  * To get through a NAT we only list addresses if we have
 2188                  * more than one. That way if you just bind a single address
 2189                  * we let the source of the init dictate our address.
 2190                  */
 2191                 if (cnt > 1) {
 2192                         cnt = cnt_inits_to;
 2193                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2194                                 if (laddr->ifa == NULL) {
 2195                                         continue;
 2196                                 }
 2197                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
 2198                                         continue;
 2199                                 }
 2200                                 if (sctp_is_address_in_scope(laddr->ifa,
 2201                                     scope, 0) == 0) {
 2202                                         continue;
 2203                                 }
 2204                                 if ((chunk_len != NULL) &&
 2205                                     (padding_len != NULL) &&
 2206                                     (*padding_len > 0)) {
 2207                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2208                                         SCTP_BUF_LEN(m_at) += *padding_len;
 2209                                         *chunk_len += *padding_len;
 2210                                         *padding_len = 0;
 2211                                 }
 2212                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
 2213                                 cnt++;
 2214                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 2215                                         break;
 2216                                 }
 2217                         }
 2218                 }
 2219         }
 2220         SCTP_IPI_ADDR_RUNLOCK();
 2221         return (m_at);
 2222 }
 2223 
 2224 static struct sctp_ifa *
 2225 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 2226     uint8_t dest_is_loop,
 2227     uint8_t dest_is_priv,
 2228     sa_family_t fam)
 2229 {
 2230         uint8_t dest_is_global = 0;
 2231 
 2232         /* dest_is_priv is true if destination is a private address */
 2233         /* dest_is_loop is true if destination is a loopback addresses */
 2234 
 2235         /**
 2236          * Here we determine if its a preferred address. A preferred address
 2237          * means it is the same scope or higher scope then the destination.
 2238          * L = loopback, P = private, G = global
 2239          * -----------------------------------------
 2240          *    src    |  dest | result
 2241          *  ----------------------------------------
 2242          *     L     |    L  |    yes
 2243          *  -----------------------------------------
 2244          *     P     |    L  |    yes-v4 no-v6
 2245          *  -----------------------------------------
 2246          *     G     |    L  |    yes-v4 no-v6
 2247          *  -----------------------------------------
 2248          *     L     |    P  |    no
 2249          *  -----------------------------------------
 2250          *     P     |    P  |    yes
 2251          *  -----------------------------------------
 2252          *     G     |    P  |    no
 2253          *   -----------------------------------------
 2254          *     L     |    G  |    no
 2255          *   -----------------------------------------
 2256          *     P     |    G  |    no
 2257          *    -----------------------------------------
 2258          *     G     |    G  |    yes
 2259          *    -----------------------------------------
 2260          */
 2261 
 2262         if (ifa->address.sa.sa_family != fam) {
 2263                 /* forget mis-matched family */
 2264                 return (NULL);
 2265         }
 2266         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 2267                 dest_is_global = 1;
 2268         }
 2269         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 2270         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 2271         /* Ok the address may be ok */
 2272 #ifdef INET6
 2273         if (fam == AF_INET6) {
 2274                 /* ok to use deprecated addresses? no lets not! */
 2275                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 2277                         return (NULL);
 2278                 }
 2279                 if (ifa->src_is_priv && !ifa->src_is_loop) {
 2280                         if (dest_is_loop) {
 2281                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 2282                                 return (NULL);
 2283                         }
 2284                 }
 2285                 if (ifa->src_is_glob) {
 2286                         if (dest_is_loop) {
 2287                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 2288                                 return (NULL);
 2289                         }
 2290                 }
 2291         }
 2292 #endif
 2293         /*
 2294          * Now that we know what is what, implement or table this could in
 2295          * theory be done slicker (it used to be), but this is
 2296          * straightforward and easier to validate :-)
 2297          */
 2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 2299             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 2300         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 2301             dest_is_loop, dest_is_priv, dest_is_global);
 2302 
 2303         if ((ifa->src_is_loop) && (dest_is_priv)) {
 2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 2305                 return (NULL);
 2306         }
 2307         if ((ifa->src_is_glob) && (dest_is_priv)) {
 2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 2309                 return (NULL);
 2310         }
 2311         if ((ifa->src_is_loop) && (dest_is_global)) {
 2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 2313                 return (NULL);
 2314         }
 2315         if ((ifa->src_is_priv) && (dest_is_global)) {
 2316                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 2317                 return (NULL);
 2318         }
 2319         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 2320         /* its a preferred address */
 2321         return (ifa);
 2322 }
 2323 
 2324 static struct sctp_ifa *
 2325 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 2326     uint8_t dest_is_loop,
 2327     uint8_t dest_is_priv,
 2328     sa_family_t fam)
 2329 {
 2330         uint8_t dest_is_global = 0;
 2331 
 2332         /**
 2333          * Here we determine if its a acceptable address. A acceptable
 2334          * address means it is the same scope or higher scope but we can
 2335          * allow for NAT which means its ok to have a global dest and a
 2336          * private src.
 2337          *
 2338          * L = loopback, P = private, G = global
 2339          * -----------------------------------------
 2340          *  src    |  dest | result
 2341          * -----------------------------------------
 2342          *   L     |   L   |    yes
 2343          *  -----------------------------------------
 2344          *   P     |   L   |    yes-v4 no-v6
 2345          *  -----------------------------------------
 2346          *   G     |   L   |    yes
 2347          * -----------------------------------------
 2348          *   L     |   P   |    no
 2349          * -----------------------------------------
 2350          *   P     |   P   |    yes
 2351          * -----------------------------------------
 2352          *   G     |   P   |    yes - May not work
 2353          * -----------------------------------------
 2354          *   L     |   G   |    no
 2355          * -----------------------------------------
 2356          *   P     |   G   |    yes - May not work
 2357          * -----------------------------------------
 2358          *   G     |   G   |    yes
 2359          * -----------------------------------------
 2360          */
 2361 
 2362         if (ifa->address.sa.sa_family != fam) {
 2363                 /* forget non matching family */
 2364                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
 2365                     ifa->address.sa.sa_family, fam);
 2366                 return (NULL);
 2367         }
 2368         /* Ok the address may be ok */
 2369         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
 2370         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
 2371             dest_is_loop, dest_is_priv);
 2372         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 2373                 dest_is_global = 1;
 2374         }
 2375 #ifdef INET6
 2376         if (fam == AF_INET6) {
 2377                 /* ok to use deprecated addresses? */
 2378                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2379                         return (NULL);
 2380                 }
 2381                 if (ifa->src_is_priv) {
 2382                         /* Special case, linklocal to loop */
 2383                         if (dest_is_loop)
 2384                                 return (NULL);
 2385                 }
 2386         }
 2387 #endif
 2388         /*
 2389          * Now that we know what is what, implement our table. This could in
 2390          * theory be done slicker (it used to be), but this is
 2391          * straightforward and easier to validate :-)
 2392          */
 2393         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
 2394             ifa->src_is_loop,
 2395             dest_is_priv);
 2396         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 2397                 return (NULL);
 2398         }
 2399         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
 2400             ifa->src_is_loop,
 2401             dest_is_global);
 2402         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 2403                 return (NULL);
 2404         }
 2405         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
 2406         /* its an acceptable address */
 2407         return (ifa);
 2408 }
 2409 
 2410 int
 2411 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 2412 {
 2413         struct sctp_laddr *laddr;
 2414 
 2415         if (stcb == NULL) {
 2416                 /* There are no restrictions, no TCB :-) */
 2417                 return (0);
 2418         }
 2419         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 2420                 if (laddr->ifa == NULL) {
 2421                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2422                             __func__);
 2423                         continue;
 2424                 }
 2425                 if (laddr->ifa == ifa) {
 2426                         /* Yes it is on the list */
 2427                         return (1);
 2428                 }
 2429         }
 2430         return (0);
 2431 }
 2432 
 2433 
 2434 int
 2435 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 2436 {
 2437         struct sctp_laddr *laddr;
 2438 
 2439         if (ifa == NULL)
 2440                 return (0);
 2441         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2442                 if (laddr->ifa == NULL) {
 2443                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2444                             __func__);
 2445                         continue;
 2446                 }
 2447                 if ((laddr->ifa == ifa) && laddr->action == 0)
 2448                         /* same pointer */
 2449                         return (1);
 2450         }
 2451         return (0);
 2452 }
 2453 
 2454 
 2455 
 2456 static struct sctp_ifa *
 2457 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 2458     sctp_route_t *ro,
 2459     uint32_t vrf_id,
 2460     int non_asoc_addr_ok,
 2461     uint8_t dest_is_priv,
 2462     uint8_t dest_is_loop,
 2463     sa_family_t fam)
 2464 {
 2465         struct sctp_laddr *laddr, *starting_point;
 2466         void *ifn;
 2467         int resettotop = 0;
 2468         struct sctp_ifn *sctp_ifn;
 2469         struct sctp_ifa *sctp_ifa, *sifa;
 2470         struct sctp_vrf *vrf;
 2471         uint32_t ifn_index;
 2472 
 2473         vrf = sctp_find_vrf(vrf_id);
 2474         if (vrf == NULL)
 2475                 return (NULL);
 2476 
 2477         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2478         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2479         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2480         /*
 2481          * first question, is the ifn we will emit on in our list, if so, we
 2482          * want such an address. Note that we first looked for a preferred
 2483          * address.
 2484          */
 2485         if (sctp_ifn) {
 2486                 /* is a preferred one on the interface we route out? */
 2487                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2488 #ifdef INET
 2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2490                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2491                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2492                                 continue;
 2493                         }
 2494 #endif
 2495 #ifdef INET6
 2496                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2497                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2498                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2499                                 continue;
 2500                         }
 2501 #endif
 2502                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2503                             (non_asoc_addr_ok == 0))
 2504                                 continue;
 2505                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 2506                             dest_is_loop,
 2507                             dest_is_priv, fam);
 2508                         if (sifa == NULL)
 2509                                 continue;
 2510                         if (sctp_is_addr_in_ep(inp, sifa)) {
 2511                                 atomic_add_int(&sifa->refcount, 1);
 2512                                 return (sifa);
 2513                         }
 2514                 }
 2515         }
 2516         /*
 2517          * ok, now we now need to find one on the list of the addresses. We
 2518          * can't get one on the emitting interface so let's find first a
 2519          * preferred one. If not that an acceptable one otherwise... we
 2520          * return NULL.
 2521          */
 2522         starting_point = inp->next_addr_touse;
 2523 once_again:
 2524         if (inp->next_addr_touse == NULL) {
 2525                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2526                 resettotop = 1;
 2527         }
 2528         for (laddr = inp->next_addr_touse; laddr;
 2529             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2530                 if (laddr->ifa == NULL) {
 2531                         /* address has been removed */
 2532                         continue;
 2533                 }
 2534                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2535                         /* address is being deleted */
 2536                         continue;
 2537                 }
 2538                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 2539                     dest_is_priv, fam);
 2540                 if (sifa == NULL)
 2541                         continue;
 2542                 atomic_add_int(&sifa->refcount, 1);
 2543                 return (sifa);
 2544         }
 2545         if (resettotop == 0) {
 2546                 inp->next_addr_touse = NULL;
 2547                 goto once_again;
 2548         }
 2549 
 2550         inp->next_addr_touse = starting_point;
 2551         resettotop = 0;
 2552 once_again_too:
 2553         if (inp->next_addr_touse == NULL) {
 2554                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2555                 resettotop = 1;
 2556         }
 2557 
 2558         /* ok, what about an acceptable address in the inp */
 2559         for (laddr = inp->next_addr_touse; laddr;
 2560             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2561                 if (laddr->ifa == NULL) {
 2562                         /* address has been removed */
 2563                         continue;
 2564                 }
 2565                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2566                         /* address is being deleted */
 2567                         continue;
 2568                 }
 2569                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2570                     dest_is_priv, fam);
 2571                 if (sifa == NULL)
 2572                         continue;
 2573                 atomic_add_int(&sifa->refcount, 1);
 2574                 return (sifa);
 2575         }
 2576         if (resettotop == 0) {
 2577                 inp->next_addr_touse = NULL;
 2578                 goto once_again_too;
 2579         }
 2580 
 2581         /*
 2582          * no address bound can be a source for the destination we are in
 2583          * trouble
 2584          */
 2585         return (NULL);
 2586 }
 2587 
 2588 
 2589 
 2590 static struct sctp_ifa *
 2591 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 2592     struct sctp_tcb *stcb,
 2593     sctp_route_t *ro,
 2594     uint32_t vrf_id,
 2595     uint8_t dest_is_priv,
 2596     uint8_t dest_is_loop,
 2597     int non_asoc_addr_ok,
 2598     sa_family_t fam)
 2599 {
 2600         struct sctp_laddr *laddr, *starting_point;
 2601         void *ifn;
 2602         struct sctp_ifn *sctp_ifn;
 2603         struct sctp_ifa *sctp_ifa, *sifa;
 2604         uint8_t start_at_beginning = 0;
 2605         struct sctp_vrf *vrf;
 2606         uint32_t ifn_index;
 2607 
 2608         /*
 2609          * first question, is the ifn we will emit on in our list, if so, we
 2610          * want that one.
 2611          */
 2612         vrf = sctp_find_vrf(vrf_id);
 2613         if (vrf == NULL)
 2614                 return (NULL);
 2615 
 2616         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2617         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2618         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2619 
 2620         /*
 2621          * first question, is the ifn we will emit on in our list?  If so,
 2622          * we want that one. First we look for a preferred. Second, we go
 2623          * for an acceptable.
 2624          */
 2625         if (sctp_ifn) {
 2626                 /* first try for a preferred address on the ep */
 2627                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2628 #ifdef INET
 2629                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2630                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2631                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2632                                 continue;
 2633                         }
 2634 #endif
 2635 #ifdef INET6
 2636                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2637                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2638                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2639                                 continue;
 2640                         }
 2641 #endif
 2642                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2643                                 continue;
 2644                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2645                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2646                                 if (sifa == NULL)
 2647                                         continue;
 2648                                 if (((non_asoc_addr_ok == 0) &&
 2649                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2650                                     (non_asoc_addr_ok &&
 2651                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2652                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2653                                         /* on the no-no list */
 2654                                         continue;
 2655                                 }
 2656                                 atomic_add_int(&sifa->refcount, 1);
 2657                                 return (sifa);
 2658                         }
 2659                 }
 2660                 /* next try for an acceptable address on the ep */
 2661                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2662 #ifdef INET
 2663                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2664                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2665                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2666                                 continue;
 2667                         }
 2668 #endif
 2669 #ifdef INET6
 2670                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2671                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2672                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2673                                 continue;
 2674                         }
 2675 #endif
 2676                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2677                                 continue;
 2678                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2679                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2680                                 if (sifa == NULL)
 2681                                         continue;
 2682                                 if (((non_asoc_addr_ok == 0) &&
 2683                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2684                                     (non_asoc_addr_ok &&
 2685                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2686                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2687                                         /* on the no-no list */
 2688                                         continue;
 2689                                 }
 2690                                 atomic_add_int(&sifa->refcount, 1);
 2691                                 return (sifa);
 2692                         }
 2693                 }
 2694 
 2695         }
 2696         /*
 2697          * if we can't find one like that then we must look at all addresses
 2698          * bound to pick one at first preferable then secondly acceptable.
 2699          */
 2700         starting_point = stcb->asoc.last_used_address;
 2701 sctp_from_the_top:
 2702         if (stcb->asoc.last_used_address == NULL) {
 2703                 start_at_beginning = 1;
 2704                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2705         }
 2706         /* search beginning with the last used address */
 2707         for (laddr = stcb->asoc.last_used_address; laddr;
 2708             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2709                 if (laddr->ifa == NULL) {
 2710                         /* address has been removed */
 2711                         continue;
 2712                 }
 2713                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2714                         /* address is being deleted */
 2715                         continue;
 2716                 }
 2717                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 2718                 if (sifa == NULL)
 2719                         continue;
 2720                 if (((non_asoc_addr_ok == 0) &&
 2721                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2722                     (non_asoc_addr_ok &&
 2723                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2724                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2725                         /* on the no-no list */
 2726                         continue;
 2727                 }
 2728                 stcb->asoc.last_used_address = laddr;
 2729                 atomic_add_int(&sifa->refcount, 1);
 2730                 return (sifa);
 2731         }
 2732         if (start_at_beginning == 0) {
 2733                 stcb->asoc.last_used_address = NULL;
 2734                 goto sctp_from_the_top;
 2735         }
 2736         /* now try for any higher scope than the destination */
 2737         stcb->asoc.last_used_address = starting_point;
 2738         start_at_beginning = 0;
 2739 sctp_from_the_top2:
 2740         if (stcb->asoc.last_used_address == NULL) {
 2741                 start_at_beginning = 1;
 2742                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2743         }
 2744         /* search beginning with the last used address */
 2745         for (laddr = stcb->asoc.last_used_address; laddr;
 2746             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2747                 if (laddr->ifa == NULL) {
 2748                         /* address has been removed */
 2749                         continue;
 2750                 }
 2751                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2752                         /* address is being deleted */
 2753                         continue;
 2754                 }
 2755                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2756                     dest_is_priv, fam);
 2757                 if (sifa == NULL)
 2758                         continue;
 2759                 if (((non_asoc_addr_ok == 0) &&
 2760                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2761                     (non_asoc_addr_ok &&
 2762                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2763                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2764                         /* on the no-no list */
 2765                         continue;
 2766                 }
 2767                 stcb->asoc.last_used_address = laddr;
 2768                 atomic_add_int(&sifa->refcount, 1);
 2769                 return (sifa);
 2770         }
 2771         if (start_at_beginning == 0) {
 2772                 stcb->asoc.last_used_address = NULL;
 2773                 goto sctp_from_the_top2;
 2774         }
 2775         return (NULL);
 2776 }
 2777 
 2778 static struct sctp_ifa *
 2779 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 2780     struct sctp_inpcb *inp,
 2781     struct sctp_tcb *stcb,
 2782     int non_asoc_addr_ok,
 2783     uint8_t dest_is_loop,
 2784     uint8_t dest_is_priv,
 2785     int addr_wanted,
 2786     sa_family_t fam,
 2787     sctp_route_t *ro
 2788 )
 2789 {
 2790         struct sctp_ifa *ifa, *sifa;
 2791         int num_eligible_addr = 0;
 2792 #ifdef INET6
 2793         struct sockaddr_in6 sin6, lsa6;
 2794 
 2795         if (fam == AF_INET6) {
 2796                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
 2797                 (void)sa6_recoverscope(&sin6);
 2798         }
 2799 #endif                          /* INET6 */
 2800         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2801 #ifdef INET
 2802                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2803                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2804                     &ifa->address.sin.sin_addr) != 0)) {
 2805                         continue;
 2806                 }
 2807 #endif
 2808 #ifdef INET6
 2809                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2810                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2811                     &ifa->address.sin6.sin6_addr) != 0)) {
 2812                         continue;
 2813                 }
 2814 #endif
 2815                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2816                     (non_asoc_addr_ok == 0))
 2817                         continue;
 2818                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2819                     dest_is_priv, fam);
 2820                 if (sifa == NULL)
 2821                         continue;
 2822 #ifdef INET6
 2823                 if (fam == AF_INET6 &&
 2824                     dest_is_loop &&
 2825                     sifa->src_is_loop && sifa->src_is_priv) {
 2826                         /*
 2827                          * don't allow fe80::1 to be a src on loop ::1, we
 2828                          * don't list it to the peer so we will get an
 2829                          * abort.
 2830                          */
 2831                         continue;
 2832                 }
 2833                 if (fam == AF_INET6 &&
 2834                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
 2835                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
 2836                         /*
 2837                          * link-local <-> link-local must belong to the same
 2838                          * scope.
 2839                          */
 2840                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
 2841                         (void)sa6_recoverscope(&lsa6);
 2842                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
 2843                                 continue;
 2844                         }
 2845                 }
 2846 #endif                          /* INET6 */
 2847 
 2848                 /*
 2849                  * Check if the IPv6 address matches to next-hop. In the
 2850                  * mobile case, old IPv6 address may be not deleted from the
 2851                  * interface. Then, the interface has previous and new
 2852                  * addresses.  We should use one corresponding to the
 2853                  * next-hop.  (by micchie)
 2854                  */
 2855 #ifdef INET6
 2856                 if (stcb && fam == AF_INET6 &&
 2857                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2858                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
 2859                             == 0) {
 2860                                 continue;
 2861                         }
 2862                 }
 2863 #endif
 2864 #ifdef INET
 2865                 /* Avoid topologically incorrect IPv4 address */
 2866                 if (stcb && fam == AF_INET &&
 2867                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2868                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 2869                                 continue;
 2870                         }
 2871                 }
 2872 #endif
 2873                 if (stcb) {
 2874                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2875                                 continue;
 2876                         }
 2877                         if (((non_asoc_addr_ok == 0) &&
 2878                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2879                             (non_asoc_addr_ok &&
 2880                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2881                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2882                                 /*
 2883                                  * It is restricted for some reason..
 2884                                  * probably not yet added.
 2885                                  */
 2886                                 continue;
 2887                         }
 2888                 }
 2889                 if (num_eligible_addr >= addr_wanted) {
 2890                         return (sifa);
 2891                 }
 2892                 num_eligible_addr++;
 2893         }
 2894         return (NULL);
 2895 }
 2896 
 2897 
 2898 static int
 2899 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 2900     struct sctp_inpcb *inp,
 2901     struct sctp_tcb *stcb,
 2902     int non_asoc_addr_ok,
 2903     uint8_t dest_is_loop,
 2904     uint8_t dest_is_priv,
 2905     sa_family_t fam)
 2906 {
 2907         struct sctp_ifa *ifa, *sifa;
 2908         int num_eligible_addr = 0;
 2909 
 2910         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2911 #ifdef INET
 2912                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2913                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2914                     &ifa->address.sin.sin_addr) != 0)) {
 2915                         continue;
 2916                 }
 2917 #endif
 2918 #ifdef INET6
 2919                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2920                     (stcb != NULL) &&
 2921                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2922                     &ifa->address.sin6.sin6_addr) != 0)) {
 2923                         continue;
 2924                 }
 2925 #endif
 2926                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2927                     (non_asoc_addr_ok == 0)) {
 2928                         continue;
 2929                 }
 2930                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2931                     dest_is_priv, fam);
 2932                 if (sifa == NULL) {
 2933                         continue;
 2934                 }
 2935                 if (stcb) {
 2936                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2937                                 continue;
 2938                         }
 2939                         if (((non_asoc_addr_ok == 0) &&
 2940                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2941                             (non_asoc_addr_ok &&
 2942                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2943                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2944                                 /*
 2945                                  * It is restricted for some reason..
 2946                                  * probably not yet added.
 2947                                  */
 2948                                 continue;
 2949                         }
 2950                 }
 2951                 num_eligible_addr++;
 2952         }
 2953         return (num_eligible_addr);
 2954 }
 2955 
 2956 static struct sctp_ifa *
 2957 sctp_choose_boundall(struct sctp_inpcb *inp,
 2958     struct sctp_tcb *stcb,
 2959     struct sctp_nets *net,
 2960     sctp_route_t *ro,
 2961     uint32_t vrf_id,
 2962     uint8_t dest_is_priv,
 2963     uint8_t dest_is_loop,
 2964     int non_asoc_addr_ok,
 2965     sa_family_t fam)
 2966 {
 2967         int cur_addr_num = 0, num_preferred = 0;
 2968         void *ifn;
 2969         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 2970         struct sctp_ifa *sctp_ifa, *sifa;
 2971         uint32_t ifn_index;
 2972         struct sctp_vrf *vrf;
 2973 #ifdef INET
 2974         int retried = 0;
 2975 #endif
 2976 
 2977         /*-
 2978          * For boundall we can use any address in the association.
 2979          * If non_asoc_addr_ok is set we can use any address (at least in
 2980          * theory). So we look for preferred addresses first. If we find one,
 2981          * we use it. Otherwise we next try to get an address on the
 2982          * interface, which we should be able to do (unless non_asoc_addr_ok
 2983          * is false and we are routed out that way). In these cases where we
 2984          * can't use the address of the interface we go through all the
 2985          * ifn's looking for an address we can use and fill that in. Punting
 2986          * means we send back address 0, which will probably cause problems
 2987          * actually since then IP will fill in the address of the route ifn,
 2988          * which means we probably already rejected it.. i.e. here comes an
 2989          * abort :-<.
 2990          */
 2991         vrf = sctp_find_vrf(vrf_id);
 2992         if (vrf == NULL)
 2993                 return (NULL);
 2994 
 2995         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2996         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2997         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
 2998         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2999         if (sctp_ifn == NULL) {
 3000                 /* ?? We don't have this guy ?? */
 3001                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 3002                 goto bound_all_plan_b;
 3003         }
 3004         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 3005             ifn_index, sctp_ifn->ifn_name);
 3006 
 3007         if (net) {
 3008                 cur_addr_num = net->indx_of_eligible_next_to_use;
 3009         }
 3010         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 3011             inp, stcb,
 3012             non_asoc_addr_ok,
 3013             dest_is_loop,
 3014             dest_is_priv, fam);
 3015         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 3016             num_preferred, sctp_ifn->ifn_name);
 3017         if (num_preferred == 0) {
 3018                 /*
 3019                  * no eligible addresses, we must use some other interface
 3020                  * address if we can find one.
 3021                  */
 3022                 goto bound_all_plan_b;
 3023         }
 3024         /*
 3025          * Ok we have num_eligible_addr set with how many we can use, this
 3026          * may vary from call to call due to addresses being deprecated
 3027          * etc..
 3028          */
 3029         if (cur_addr_num >= num_preferred) {
 3030                 cur_addr_num = 0;
 3031         }
 3032         /*
 3033          * select the nth address from the list (where cur_addr_num is the
 3034          * nth) and 0 is the first one, 1 is the second one etc...
 3035          */
 3036         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 3037 
 3038         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3039             dest_is_priv, cur_addr_num, fam, ro);
 3040 
 3041         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 3042         if (sctp_ifa) {
 3043                 atomic_add_int(&sctp_ifa->refcount, 1);
 3044                 if (net) {
 3045                         /* save off where the next one we will want */
 3046                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3047                 }
 3048                 return (sctp_ifa);
 3049         }
 3050         /*
 3051          * plan_b: Look at all interfaces and find a preferred address. If
 3052          * no preferred fall through to plan_c.
 3053          */
 3054 bound_all_plan_b:
 3055         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 3056         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3057                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 3058                     sctp_ifn->ifn_name);
 3059                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3060                         /* wrong base scope */
 3061                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 3062                         continue;
 3063                 }
 3064                 if ((sctp_ifn == looked_at) && looked_at) {
 3065                         /* already looked at this guy */
 3066                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 3067                         continue;
 3068                 }
 3069                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
 3070                     dest_is_loop, dest_is_priv, fam);
 3071                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3072                     "Found ifn:%p %d preferred source addresses\n",
 3073                     ifn, num_preferred);
 3074                 if (num_preferred == 0) {
 3075                         /* None on this interface. */
 3076                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
 3077                         continue;
 3078                 }
 3079                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3080                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 3081                     num_preferred, (void *)sctp_ifn, cur_addr_num);
 3082 
 3083                 /*
 3084                  * Ok we have num_eligible_addr set with how many we can
 3085                  * use, this may vary from call to call due to addresses
 3086                  * being deprecated etc..
 3087                  */
 3088                 if (cur_addr_num >= num_preferred) {
 3089                         cur_addr_num = 0;
 3090                 }
 3091                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3092                     dest_is_priv, cur_addr_num, fam, ro);
 3093                 if (sifa == NULL)
 3094                         continue;
 3095                 if (net) {
 3096                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 3098                             cur_addr_num);
 3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 3101                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 3102                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 3103                 }
 3104                 atomic_add_int(&sifa->refcount, 1);
 3105                 return (sifa);
 3106         }
 3107 #ifdef INET
 3108 again_with_private_addresses_allowed:
 3109 #endif
 3110         /* plan_c: do we have an acceptable address on the emit interface */
 3111         sifa = NULL;
 3112         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 3113         if (emit_ifn == NULL) {
 3114                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
 3115                 goto plan_d;
 3116         }
 3117         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 3118                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
 3119 #ifdef INET
 3120                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3121                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3122                     &sctp_ifa->address.sin.sin_addr) != 0)) {
 3123                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3124                         continue;
 3125                 }
 3126 #endif
 3127 #ifdef INET6
 3128                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3129                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3130                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3132                         continue;
 3133                 }
 3134 #endif
 3135                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3136                     (non_asoc_addr_ok == 0)) {
 3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
 3138                         continue;
 3139                 }
 3140                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 3141                     dest_is_priv, fam);
 3142                 if (sifa == NULL) {
 3143                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
 3144                         continue;
 3145                 }
 3146                 if (stcb) {
 3147                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
 3149                                 sifa = NULL;
 3150                                 continue;
 3151                         }
 3152                         if (((non_asoc_addr_ok == 0) &&
 3153                             (sctp_is_addr_restricted(stcb, sifa))) ||
 3154                             (non_asoc_addr_ok &&
 3155                             (sctp_is_addr_restricted(stcb, sifa)) &&
 3156                             (!sctp_is_addr_pending(stcb, sifa)))) {
 3157                                 /*
 3158                                  * It is restricted for some reason..
 3159                                  * probably not yet added.
 3160                                  */
 3161                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
 3162                                 sifa = NULL;
 3163                                 continue;
 3164                         }
 3165                 }
 3166                 atomic_add_int(&sifa->refcount, 1);
 3167                 goto out;
 3168         }
 3169 plan_d:
 3170         /*
 3171          * plan_d: We are in trouble. No preferred address on the emit
 3172          * interface. And not even a preferred address on all interfaces. Go
 3173          * out and see if we can find an acceptable address somewhere
 3174          * amongst all interfaces.
 3175          */
 3176         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
 3177         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3178                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3179                         /* wrong base scope */
 3180                         continue;
 3181                 }
 3182                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3183 #ifdef INET
 3184                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3185                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3186                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3187                                 continue;
 3188                         }
 3189 #endif
 3190 #ifdef INET6
 3191                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3192                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3193                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3194                                 continue;
 3195                         }
 3196 #endif
 3197                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3198                             (non_asoc_addr_ok == 0))
 3199                                 continue;
 3200                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3201                             dest_is_loop,
 3202                             dest_is_priv, fam);
 3203                         if (sifa == NULL)
 3204                                 continue;
 3205                         if (stcb) {
 3206                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3207                                         sifa = NULL;
 3208                                         continue;
 3209                                 }
 3210                                 if (((non_asoc_addr_ok == 0) &&
 3211                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 3212                                     (non_asoc_addr_ok &&
 3213                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 3214                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 3215                                         /*
 3216                                          * It is restricted for some
 3217                                          * reason.. probably not yet added.
 3218                                          */
 3219                                         sifa = NULL;
 3220                                         continue;
 3221                                 }
 3222                         }
 3223                         goto out;
 3224                 }
 3225         }
 3226 #ifdef INET
 3227         if (stcb) {
 3228                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
 3229                         stcb->asoc.scope.ipv4_local_scope = 1;
 3230                         retried = 1;
 3231                         goto again_with_private_addresses_allowed;
 3232                 } else if (retried == 1) {
 3233                         stcb->asoc.scope.ipv4_local_scope = 0;
 3234                 }
 3235         }
 3236 #endif
 3237 out:
 3238 #ifdef INET
 3239         if (sifa) {
 3240                 if (retried == 1) {
 3241                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3242                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3243                                         /* wrong base scope */
 3244                                         continue;
 3245                                 }
 3246                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3247                                         struct sctp_ifa *tmp_sifa;
 3248 
 3249 #ifdef INET
 3250                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3251                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3252                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3253                                                 continue;
 3254                                         }
 3255 #endif
 3256 #ifdef INET6
 3257                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3258                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3259                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3260                                                 continue;
 3261                                         }
 3262 #endif
 3263                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3264                                             (non_asoc_addr_ok == 0))
 3265                                                 continue;
 3266                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3267                                             dest_is_loop,
 3268                                             dest_is_priv, fam);
 3269                                         if (tmp_sifa == NULL) {
 3270                                                 continue;
 3271                                         }
 3272                                         if (tmp_sifa == sifa) {
 3273                                                 continue;
 3274                                         }
 3275                                         if (stcb) {
 3276                                                 if (sctp_is_address_in_scope(tmp_sifa,
 3277                                                     &stcb->asoc.scope, 0) == 0) {
 3278                                                         continue;
 3279                                                 }
 3280                                                 if (((non_asoc_addr_ok == 0) &&
 3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
 3282                                                     (non_asoc_addr_ok &&
 3283                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
 3284                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
 3285                                                         /*
 3286                                                          * It is restricted
 3287                                                          * for some reason..
 3288                                                          * probably not yet
 3289                                                          * added.
 3290                                                          */
 3291                                                         continue;
 3292                                                 }
 3293                                         }
 3294                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
 3295                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
 3296                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
 3297                                         }
 3298                                 }
 3299                         }
 3300                 }
 3301                 atomic_add_int(&sifa->refcount, 1);
 3302         }
 3303 #endif
 3304         return (sifa);
 3305 }
 3306 
 3307 
 3308 
 3309 /* tcb may be NULL */
 3310 struct sctp_ifa *
 3311 sctp_source_address_selection(struct sctp_inpcb *inp,
 3312     struct sctp_tcb *stcb,
 3313     sctp_route_t *ro,
 3314     struct sctp_nets *net,
 3315     int non_asoc_addr_ok, uint32_t vrf_id)
 3316 {
 3317         struct sctp_ifa *answer;
 3318         uint8_t dest_is_priv, dest_is_loop;
 3319         sa_family_t fam;
 3320 #ifdef INET
 3321         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 3322 #endif
 3323 #ifdef INET6
 3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 3325 #endif
 3326 
 3327         /**
 3328          * Rules:
 3329          * - Find the route if needed, cache if I can.
 3330          * - Look at interface address in route, Is it in the bound list. If so we
 3331          *   have the best source.
 3332          * - If not we must rotate amongst the addresses.
 3333          *
 3334          * Cavets and issues
 3335          *
 3336          * Do we need to pay attention to scope. We can have a private address
 3337          * or a global address we are sourcing or sending to. So if we draw
 3338          * it out
 3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3340          * For V4
 3341          * ------------------------------------------
 3342          *      source     *      dest  *  result
 3343          * -----------------------------------------
 3344          * <a>  Private    *    Global  *  NAT
 3345          * -----------------------------------------
 3346          * <b>  Private    *    Private *  No problem
 3347          * -----------------------------------------
 3348          * <c>  Global     *    Private *  Huh, How will this work?
 3349          * -----------------------------------------
 3350          * <d>  Global     *    Global  *  No Problem
 3351          *------------------------------------------
 3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3353          * For V6
 3354          *------------------------------------------
 3355          *      source     *      dest  *  result
 3356          * -----------------------------------------
 3357          * <a>  Linklocal  *    Global  *
 3358          * -----------------------------------------
 3359          * <b>  Linklocal  * Linklocal  *  No problem
 3360          * -----------------------------------------
 3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
 3362          * -----------------------------------------
 3363          * <d>  Global     *    Global  *  No Problem
 3364          *------------------------------------------
 3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3366          *
 3367          * And then we add to that what happens if there are multiple addresses
 3368          * assigned to an interface. Remember the ifa on a ifn is a linked
 3369          * list of addresses. So one interface can have more than one IP
 3370          * address. What happens if we have both a private and a global
 3371          * address? Do we then use context of destination to sort out which
 3372          * one is best? And what about NAT's sending P->G may get you a NAT
 3373          * translation, or should you select the G thats on the interface in
 3374          * preference.
 3375          *
 3376          * Decisions:
 3377          *
 3378          * - count the number of addresses on the interface.
 3379          * - if it is one, no problem except case <c>.
 3380          *   For <a> we will assume a NAT out there.
 3381          * - if there are more than one, then we need to worry about scope P
 3382          *   or G. We should prefer G -> G and P -> P if possible.
 3383          *   Then as a secondary fall back to mixed types G->P being a last
 3384          *   ditch one.
 3385          * - The above all works for bound all, but bound specific we need to
 3386          *   use the same concept but instead only consider the bound
 3387          *   addresses. If the bound set is NOT assigned to the interface then
 3388          *   we must use rotation amongst the bound addresses..
 3389          */
 3390         if (ro->ro_rt == NULL) {
 3391                 /*
 3392                  * Need a route to cache.
 3393                  */
 3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 3395         }
 3396         if (ro->ro_rt == NULL) {
 3397                 return (NULL);
 3398         }
 3399         fam = ro->ro_dst.sa_family;
 3400         dest_is_priv = dest_is_loop = 0;
 3401         /* Setup our scopes for the destination */
 3402         switch (fam) {
 3403 #ifdef INET
 3404         case AF_INET:
 3405                 /* Scope based on outbound address */
 3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 3407                         dest_is_loop = 1;
 3408                         if (net != NULL) {
 3409                                 /* mark it as local */
 3410                                 net->addr_is_local = 1;
 3411                         }
 3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 3413                         dest_is_priv = 1;
 3414                 }
 3415                 break;
 3416 #endif
 3417 #ifdef INET6
 3418         case AF_INET6:
 3419                 /* Scope based on outbound address */
 3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
 3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
 3422                         /*
 3423                          * If the address is a loopback address, which
 3424                          * consists of "::1" OR "fe80::1%lo0", we are
 3425                          * loopback scope. But we don't use dest_is_priv
 3426                          * (link local addresses).
 3427                          */
 3428                         dest_is_loop = 1;
 3429                         if (net != NULL) {
 3430                                 /* mark it as local */
 3431                                 net->addr_is_local = 1;
 3432                         }
 3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 3434                         dest_is_priv = 1;
 3435                 }
 3436                 break;
 3437 #endif
 3438         }
 3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
 3441         SCTP_IPI_ADDR_RLOCK();
 3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3443                 /*
 3444                  * Bound all case
 3445                  */
 3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 3447                     dest_is_priv, dest_is_loop,
 3448                     non_asoc_addr_ok, fam);
 3449                 SCTP_IPI_ADDR_RUNLOCK();
 3450                 return (answer);
 3451         }
 3452         /*
 3453          * Subset bound case
 3454          */
 3455         if (stcb) {
 3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
 3457                     vrf_id, dest_is_priv,
 3458                     dest_is_loop,
 3459                     non_asoc_addr_ok, fam);
 3460         } else {
 3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 3462                     non_asoc_addr_ok,
 3463                     dest_is_priv,
 3464                     dest_is_loop, fam);
 3465         }
 3466         SCTP_IPI_ADDR_RUNLOCK();
 3467         return (answer);
 3468 }
 3469 
 3470 static int
 3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
 3472 {
 3473         struct cmsghdr cmh;
 3474         struct sctp_sndinfo sndinfo;
 3475         struct sctp_prinfo prinfo;
 3476         struct sctp_authinfo authinfo;
 3477         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3478         int found;
 3479 
 3480         /*
 3481          * Independent of how many mbufs, find the c_type inside the control
 3482          * structure and copy out the data.
 3483          */
 3484         found = 0;
 3485         tot_len = SCTP_BUF_LEN(control);
 3486         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3487                 rem_len = tot_len - off;
 3488                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3489                         /* There is not enough room for one more. */
 3490                         return (found);
 3491                 }
 3492                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3493                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3494                         /* We dont't have a complete CMSG header. */
 3495                         return (found);
 3496                 }
 3497                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3498                         /* We don't have the complete CMSG. */
 3499                         return (found);
 3500                 }
 3501                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3502                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3503                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 3504                     ((c_type == cmh.cmsg_type) ||
 3505                     ((c_type == SCTP_SNDRCV) &&
 3506                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
 3507                     (cmh.cmsg_type == SCTP_PRINFO) ||
 3508                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
 3509                         if (c_type == cmh.cmsg_type) {
 3510                                 if (cpsize > INT_MAX) {
 3511                                         return (found);
 3512                                 }
 3513                                 if (cmsg_data_len < (int)cpsize) {
 3514                                         return (found);
 3515                                 }
 3516                                 /* It is exactly what we want. Copy it out. */
 3517                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
 3518                                 return (1);
 3519                         } else {
 3520                                 struct sctp_sndrcvinfo *sndrcvinfo;
 3521 
 3522                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
 3523                                 if (found == 0) {
 3524                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
 3525                                                 return (found);
 3526                                         }
 3527                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
 3528                                 }
 3529                                 switch (cmh.cmsg_type) {
 3530                                 case SCTP_SNDINFO:
 3531                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
 3532                                                 return (found);
 3533                                         }
 3534                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
 3535                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
 3536                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
 3537                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
 3538                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
 3539                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
 3540                                         break;
 3541                                 case SCTP_PRINFO:
 3542                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
 3543                                                 return (found);
 3544                                         }
 3545                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
 3546                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
 3547                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
 3548                                         } else {
 3549                                                 sndrcvinfo->sinfo_timetolive = 0;
 3550                                         }
 3551                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
 3552                                         break;
 3553                                 case SCTP_AUTHINFO:
 3554                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
 3555                                                 return (found);
 3556                                         }
 3557                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
 3558                                         sndrcvinfo->sinfo_keynumber_valid = 1;
 3559                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
 3560                                         break;
 3561                                 default:
 3562                                         return (found);
 3563                                 }
 3564                                 found = 1;
 3565                         }
 3566                 }
 3567         }
 3568         return (found);
 3569 }
 3570 
 3571 static int
 3572 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
 3573 {
 3574         struct cmsghdr cmh;
 3575         struct sctp_initmsg initmsg;
 3576 #ifdef INET
 3577         struct sockaddr_in sin;
 3578 #endif
 3579 #ifdef INET6
 3580         struct sockaddr_in6 sin6;
 3581 #endif
 3582         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3583 
 3584         tot_len = SCTP_BUF_LEN(control);
 3585         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3586                 rem_len = tot_len - off;
 3587                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3588                         /* There is not enough room for one more. */
 3589                         *error = EINVAL;
 3590                         return (1);
 3591                 }
 3592                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3593                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3594                         /* We dont't have a complete CMSG header. */
 3595                         *error = EINVAL;
 3596                         return (1);
 3597                 }
 3598                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3599                         /* We don't have the complete CMSG. */
 3600                         *error = EINVAL;
 3601                         return (1);
 3602                 }
 3603                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3604                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3605                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3606                         switch (cmh.cmsg_type) {
 3607                         case SCTP_INIT:
 3608                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
 3609                                         *error = EINVAL;
 3610                                         return (1);
 3611                                 }
 3612                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
 3613                                 if (initmsg.sinit_max_attempts)
 3614                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
 3615                                 if (initmsg.sinit_num_ostreams)
 3616                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
 3617                                 if (initmsg.sinit_max_instreams)
 3618                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
 3619                                 if (initmsg.sinit_max_init_timeo)
 3620                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
 3621                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
 3622                                         struct sctp_stream_out *tmp_str;
 3623                                         unsigned int i;
 3624 #if defined(SCTP_DETAILED_STR_STATS)
 3625                                         int j;
 3626 #endif
 3627 
 3628                                         /* Default is NOT correct */
 3629                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
 3630                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
 3631                                         SCTP_TCB_UNLOCK(stcb);
 3632                                         SCTP_MALLOC(tmp_str,
 3633                                             struct sctp_stream_out *,
 3634                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
 3635                                             SCTP_M_STRMO);
 3636                                         SCTP_TCB_LOCK(stcb);
 3637                                         if (tmp_str != NULL) {
 3638                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
 3639                                                 stcb->asoc.strmout = tmp_str;
 3640                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
 3641                                         } else {
 3642                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
 3643                                         }
 3644                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3645                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
 3646                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
 3647                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
 3648                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
 3649 #if defined(SCTP_DETAILED_STR_STATS)
 3650                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 3651                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
 3652                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
 3653                                                 }
 3654 #else
 3655                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
 3656                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
 3657 #endif
 3658                                                 stcb->asoc.strmout[i].sid = i;
 3659                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
 3660                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
 3661                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
 3662                                         }
 3663                                 }
 3664                                 break;
 3665 #ifdef INET
 3666                         case SCTP_DSTADDRV4:
 3667                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
 3668                                         *error = EINVAL;
 3669                                         return (1);
 3670                                 }
 3671                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3672                                 sin.sin_family = AF_INET;
 3673                                 sin.sin_len = sizeof(struct sockaddr_in);
 3674                                 sin.sin_port = stcb->rport;
 3675                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3676                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3677                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3678                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3679                                         *error = EINVAL;
 3680                                         return (1);
 3681                                 }
 3682                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3683                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3684                                         *error = ENOBUFS;
 3685                                         return (1);
 3686                                 }
 3687                                 break;
 3688 #endif
 3689 #ifdef INET6
 3690                         case SCTP_DSTADDRV6:
 3691                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
 3692                                         *error = EINVAL;
 3693                                         return (1);
 3694                                 }
 3695                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3696                                 sin6.sin6_family = AF_INET6;
 3697                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3698                                 sin6.sin6_port = stcb->rport;
 3699                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3700                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
 3701                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
 3702                                         *error = EINVAL;
 3703                                         return (1);
 3704                                 }
 3705 #ifdef INET
 3706                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3707                                         in6_sin6_2_sin(&sin, &sin6);
 3708                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3709                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3710                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3711                                                 *error = EINVAL;
 3712                                                 return (1);
 3713                                         }
 3714                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3715                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3716                                                 *error = ENOBUFS;
 3717                                                 return (1);
 3718                                         }
 3719                                 } else
 3720 #endif
 3721                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
 3722                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3723                                         *error = ENOBUFS;
 3724                                         return (1);
 3725                                 }
 3726                                 break;
 3727 #endif
 3728                         default:
 3729                                 break;
 3730                         }
 3731                 }
 3732         }
 3733         return (0);
 3734 }
 3735 
 3736 static struct sctp_tcb *
 3737 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
 3738     uint16_t port,
 3739     struct mbuf *control,
 3740     struct sctp_nets **net_p,
 3741     int *error)
 3742 {
 3743         struct cmsghdr cmh;
 3744         struct sctp_tcb *stcb;
 3745         struct sockaddr *addr;
 3746 #ifdef INET
 3747         struct sockaddr_in sin;
 3748 #endif
 3749 #ifdef INET6
 3750         struct sockaddr_in6 sin6;
 3751 #endif
 3752         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3753 
 3754         tot_len = SCTP_BUF_LEN(control);
 3755         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3756                 rem_len = tot_len - off;
 3757                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3758                         /* There is not enough room for one more. */
 3759                         *error = EINVAL;
 3760                         return (NULL);
 3761                 }
 3762                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3763                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3764                         /* We dont't have a complete CMSG header. */
 3765                         *error = EINVAL;
 3766                         return (NULL);
 3767                 }
 3768                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3769                         /* We don't have the complete CMSG. */
 3770                         *error = EINVAL;
 3771                         return (NULL);
 3772                 }
 3773                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3774                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3775                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3776                         switch (cmh.cmsg_type) {
 3777 #ifdef INET
 3778                         case SCTP_DSTADDRV4:
 3779                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
 3780                                         *error = EINVAL;
 3781                                         return (NULL);
 3782                                 }
 3783                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3784                                 sin.sin_family = AF_INET;
 3785                                 sin.sin_len = sizeof(struct sockaddr_in);
 3786                                 sin.sin_port = port;
 3787                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3788                                 addr = (struct sockaddr *)&sin;
 3789                                 break;
 3790 #endif
 3791 #ifdef INET6
 3792                         case SCTP_DSTADDRV6:
 3793                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
 3794                                         *error = EINVAL;
 3795                                         return (NULL);
 3796                                 }
 3797                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3798                                 sin6.sin6_family = AF_INET6;
 3799                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3800                                 sin6.sin6_port = port;
 3801                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3802 #ifdef INET
 3803                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3804                                         in6_sin6_2_sin(&sin, &sin6);
 3805                                         addr = (struct sockaddr *)&sin;
 3806                                 } else
 3807 #endif
 3808                                         addr = (struct sockaddr *)&sin6;
 3809                                 break;
 3810 #endif
 3811                         default:
 3812                                 addr = NULL;
 3813                                 break;
 3814                         }
 3815                         if (addr) {
 3816                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
 3817                                 if (stcb != NULL) {
 3818                                         return (stcb);
 3819                                 }
 3820                         }
 3821                 }
 3822         }
 3823         return (NULL);
 3824 }
 3825 
 3826 static struct mbuf *
 3827 sctp_add_cookie(struct mbuf *init, int init_offset,
 3828     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
 3829 {
 3830         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
 3831         struct sctp_state_cookie *stc;
 3832         struct sctp_paramhdr *ph;
 3833         uint8_t *foo;
 3834         int sig_offset;
 3835         uint16_t cookie_sz;
 3836 
 3837         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 3838             sizeof(struct sctp_paramhdr)), 0,
 3839             M_NOWAIT, 1, MT_DATA);
 3840         if (mret == NULL) {
 3841                 return (NULL);
 3842         }
 3843         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
 3844         if (copy_init == NULL) {
 3845                 sctp_m_freem(mret);
 3846                 return (NULL);
 3847         }
 3848 #ifdef SCTP_MBUF_LOGGING
 3849         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3850                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
 3851         }
 3852 #endif
 3853         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 3854             M_NOWAIT);
 3855         if (copy_initack == NULL) {
 3856                 sctp_m_freem(mret);
 3857                 sctp_m_freem(copy_init);
 3858                 return (NULL);
 3859         }
 3860 #ifdef SCTP_MBUF_LOGGING
 3861         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3862                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
 3863         }
 3864 #endif
 3865         /* easy side we just drop it on the end */
 3866         ph = mtod(mret, struct sctp_paramhdr *);
 3867         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 3868             sizeof(struct sctp_paramhdr);
 3869         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 3870             sizeof(struct sctp_paramhdr));
 3871         ph->param_type = htons(SCTP_STATE_COOKIE);
 3872         ph->param_length = 0;   /* fill in at the end */
 3873         /* Fill in the stc cookie data */
 3874         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 3875 
 3876         /* tack the INIT and then the INIT-ACK onto the chain */
 3877         cookie_sz = 0;
 3878         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3879                 cookie_sz += SCTP_BUF_LEN(m_at);
 3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3881                         SCTP_BUF_NEXT(m_at) = copy_init;
 3882                         break;
 3883                 }
 3884         }
 3885         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3886                 cookie_sz += SCTP_BUF_LEN(m_at);
 3887                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3888                         SCTP_BUF_NEXT(m_at) = copy_initack;
 3889                         break;
 3890                 }
 3891         }
 3892         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3893                 cookie_sz += SCTP_BUF_LEN(m_at);
 3894                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3895                         break;
 3896                 }
 3897         }
 3898         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
 3899         if (sig == NULL) {
 3900                 /* no space, so free the entire chain */
 3901                 sctp_m_freem(mret);
 3902                 return (NULL);
 3903         }
 3904         SCTP_BUF_LEN(sig) = 0;
 3905         SCTP_BUF_NEXT(m_at) = sig;
 3906         sig_offset = 0;
 3907         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
 3908         memset(foo, 0, SCTP_SIGNATURE_SIZE);
 3909         *signature = foo;
 3910         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
 3911         cookie_sz += SCTP_SIGNATURE_SIZE;
 3912         ph->param_length = htons(cookie_sz);
 3913         return (mret);
 3914 }
 3915 
 3916 
 3917 static uint8_t
 3918 sctp_get_ect(struct sctp_tcb *stcb)
 3919 {
 3920         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
 3921                 return (SCTP_ECT0_BIT);
 3922         } else {
 3923                 return (0);
 3924         }
 3925 }
 3926 
 3927 #if defined(INET) || defined(INET6)
 3928 static void
 3929 sctp_handle_no_route(struct sctp_tcb *stcb,
 3930     struct sctp_nets *net,
 3931     int so_locked)
 3932 {
 3933         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
 3934 
 3935         if (net) {
 3936                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
 3937                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
 3938                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 3939                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 3940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
 3941                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 3942                                     stcb, 0,
 3943                                     (void *)net,
 3944                                     so_locked);
 3945                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 3946                                 net->dest_state &= ~SCTP_ADDR_PF;
 3947                         }
 3948                 }
 3949                 if (stcb) {
 3950                         if (net == stcb->asoc.primary_destination) {
 3951                                 /* need a new primary */
 3952                                 struct sctp_nets *alt;
 3953 
 3954                                 alt = sctp_find_alternate_net(stcb, net, 0);
 3955                                 if (alt != net) {
 3956                                         if (stcb->asoc.alternate) {
 3957                                                 sctp_free_remote_addr(stcb->asoc.alternate);
 3958                                         }
 3959                                         stcb->asoc.alternate = alt;
 3960                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 3961                                         if (net->ro._s_addr) {
 3962                                                 sctp_free_ifa(net->ro._s_addr);
 3963                                                 net->ro._s_addr = NULL;
 3964                                         }
 3965                                         net->src_addr_selected = 0;
 3966                                 }
 3967                         }
 3968                 }
 3969         }
 3970 }
 3971 #endif
 3972 
 3973 static int
 3974 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 3975     struct sctp_tcb *stcb,      /* may be NULL */
 3976     struct sctp_nets *net,
 3977     struct sockaddr *to,
 3978     struct mbuf *m,
 3979     uint32_t auth_offset,
 3980     struct sctp_auth_chunk *auth,
 3981     uint16_t auth_keyid,
 3982     int nofragment_flag,
 3983     int ecn_ok,
 3984     int out_of_asoc_ok,
 3985     uint16_t src_port,
 3986     uint16_t dest_port,
 3987     uint32_t v_tag,
 3988     uint16_t port,
 3989     union sctp_sockstore *over_addr,
 3990     uint8_t mflowtype, uint32_t mflowid,
 3991 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 3992     int so_locked SCTP_UNUSED
 3993 #else
 3994     int so_locked
 3995 #endif
 3996 )
 3997 {
 3998 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 3999         /**
 4000          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
 4001          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
 4002          * - fill in the HMAC digest of any AUTH chunk in the packet.
 4003          * - calculate and fill in the SCTP checksum.
 4004          * - prepend an IP address header.
 4005          * - if boundall use INADDR_ANY.
 4006          * - if boundspecific do source address selection.
 4007          * - set fragmentation option for ipV4.
 4008          * - On return from IP output, check/adjust mtu size of output
 4009          *   interface and smallest_mtu size as well.
 4010          */
 4011         /* Will need ifdefs around this */
 4012         struct mbuf *newm;
 4013         struct sctphdr *sctphdr;
 4014         int packet_length;
 4015         int ret;
 4016 #if defined(INET) || defined(INET6)
 4017         uint32_t vrf_id;
 4018 #endif
 4019 #if defined(INET) || defined(INET6)
 4020         struct mbuf *o_pak;
 4021         sctp_route_t *ro = NULL;
 4022         struct udphdr *udp = NULL;
 4023 #endif
 4024         uint8_t tos_value;
 4025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4026         struct socket *so = NULL;
 4027 #endif
 4028 
 4029         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 4030                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4031                 sctp_m_freem(m);
 4032                 return (EFAULT);
 4033         }
 4034 #if defined(INET) || defined(INET6)
 4035         if (stcb) {
 4036                 vrf_id = stcb->asoc.vrf_id;
 4037         } else {
 4038                 vrf_id = inp->def_vrf_id;
 4039         }
 4040 #endif
 4041         /* fill in the HMAC digest for any AUTH chunk in the packet */
 4042         if ((auth != NULL) && (stcb != NULL)) {
 4043                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
 4044         }
 4045 
 4046         if (net) {
 4047                 tos_value = net->dscp;
 4048         } else if (stcb) {
 4049                 tos_value = stcb->asoc.default_dscp;
 4050         } else {
 4051                 tos_value = inp->sctp_ep.default_dscp;
 4052         }
 4053 
 4054         switch (to->sa_family) {
 4055 #ifdef INET
 4056         case AF_INET:
 4057                 {
 4058                         struct ip *ip = NULL;
 4059                         sctp_route_t iproute;
 4060                         int len;
 4061 
 4062                         len = SCTP_MIN_V4_OVERHEAD;
 4063                         if (port) {
 4064                                 len += sizeof(struct udphdr);
 4065                         }
 4066                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4067                         if (newm == NULL) {
 4068                                 sctp_m_freem(m);
 4069                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4070                                 return (ENOMEM);
 4071                         }
 4072                         SCTP_ALIGN_TO_END(newm, len);
 4073                         SCTP_BUF_LEN(newm) = len;
 4074                         SCTP_BUF_NEXT(newm) = m;
 4075                         m = newm;
 4076                         if (net != NULL) {
 4077                                 m->m_pkthdr.flowid = net->flowid;
 4078                                 M_HASHTYPE_SET(m, net->flowtype);
 4079                         } else {
 4080                                 m->m_pkthdr.flowid = mflowid;
 4081                                 M_HASHTYPE_SET(m, mflowtype);
 4082                         }
 4083                         packet_length = sctp_calculate_len(m);
 4084                         ip = mtod(m, struct ip *);
 4085                         ip->ip_v = IPVERSION;
 4086                         ip->ip_hl = (sizeof(struct ip) >> 2);
 4087                         if (tos_value == 0) {
 4088                                 /*
 4089                                  * This means especially, that it is not set
 4090                                  * at the SCTP layer. So use the value from
 4091                                  * the IP layer.
 4092                                  */
 4093                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
 4094                         }
 4095                         tos_value &= 0xfc;
 4096                         if (ecn_ok) {
 4097                                 tos_value |= sctp_get_ect(stcb);
 4098                         }
 4099                         if ((nofragment_flag) && (port == 0)) {
 4100                                 ip->ip_off = htons(IP_DF);
 4101                         } else {
 4102                                 ip->ip_off = htons(0);
 4103                         }
 4104                         /* FreeBSD has a function for ip_id's */
 4105                         ip_fillid(ip);
 4106 
 4107                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 4108                         ip->ip_len = htons(packet_length);
 4109                         ip->ip_tos = tos_value;
 4110                         if (port) {
 4111                                 ip->ip_p = IPPROTO_UDP;
 4112                         } else {
 4113                                 ip->ip_p = IPPROTO_SCTP;
 4114                         }
 4115                         ip->ip_sum = 0;
 4116                         if (net == NULL) {
 4117                                 ro = &iproute;
 4118                                 memset(&iproute, 0, sizeof(iproute));
 4119                                 memcpy(&ro->ro_dst, to, to->sa_len);
 4120                         } else {
 4121                                 ro = (sctp_route_t *)&net->ro;
 4122                         }
 4123                         /* Now the address selection part */
 4124                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 4125 
 4126                         /* call the routine to select the src address */
 4127                         if (net && out_of_asoc_ok == 0) {
 4128                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4129                                         sctp_free_ifa(net->ro._s_addr);
 4130                                         net->ro._s_addr = NULL;
 4131                                         net->src_addr_selected = 0;
 4132                                         if (ro->ro_rt) {
 4133                                                 RTFREE(ro->ro_rt);
 4134                                                 ro->ro_rt = NULL;
 4135                                         }
 4136                                 }
 4137                                 if (net->src_addr_selected == 0) {
 4138                                         /* Cache the source address */
 4139                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 4140                                             ro, net, 0,
 4141                                             vrf_id);
 4142                                         net->src_addr_selected = 1;
 4143                                 }
 4144                                 if (net->ro._s_addr == NULL) {
 4145                                         /* No route to host */
 4146                                         net->src_addr_selected = 0;
 4147                                         sctp_handle_no_route(stcb, net, so_locked);
 4148                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4149                                         sctp_m_freem(m);
 4150                                         return (EHOSTUNREACH);
 4151                                 }
 4152                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 4153                         } else {
 4154                                 if (over_addr == NULL) {
 4155                                         struct sctp_ifa *_lsrc;
 4156 
 4157                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4158                                             net,
 4159                                             out_of_asoc_ok,
 4160                                             vrf_id);
 4161                                         if (_lsrc == NULL) {
 4162                                                 sctp_handle_no_route(stcb, net, so_locked);
 4163                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4164                                                 sctp_m_freem(m);
 4165                                                 return (EHOSTUNREACH);
 4166                                         }
 4167                                         ip->ip_src = _lsrc->address.sin.sin_addr;
 4168                                         sctp_free_ifa(_lsrc);
 4169                                 } else {
 4170                                         ip->ip_src = over_addr->sin.sin_addr;
 4171                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4172                                 }
 4173                         }
 4174                         if (port) {
 4175                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4176                                         sctp_handle_no_route(stcb, net, so_locked);
 4177                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4178                                         sctp_m_freem(m);
 4179                                         return (EHOSTUNREACH);
 4180                                 }
 4181                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
 4182                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4183                                 udp->uh_dport = port;
 4184                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
 4185                                 if (V_udp_cksum) {
 4186                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
 4187                                 } else {
 4188                                         udp->uh_sum = 0;
 4189                                 }
 4190                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4191                         } else {
 4192                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
 4193                         }
 4194 
 4195                         sctphdr->src_port = src_port;
 4196                         sctphdr->dest_port = dest_port;
 4197                         sctphdr->v_tag = v_tag;
 4198                         sctphdr->checksum = 0;
 4199 
 4200                         /*
 4201                          * If source address selection fails and we find no
 4202                          * route then the ip_output should fail as well with
 4203                          * a NO_ROUTE_TO_HOST type error. We probably should
 4204                          * catch that somewhere and abort the association
 4205                          * right away (assuming this is an INIT being sent).
 4206                          */
 4207                         if (ro->ro_rt == NULL) {
 4208                                 /*
 4209                                  * src addr selection failed to find a route
 4210                                  * (or valid source addr), so we can't get
 4211                                  * there from here (yet)!
 4212                                  */
 4213                                 sctp_handle_no_route(stcb, net, so_locked);
 4214                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4215                                 sctp_m_freem(m);
 4216                                 return (EHOSTUNREACH);
 4217                         }
 4218                         if (ro != &iproute) {
 4219                                 memcpy(&iproute, ro, sizeof(*ro));
 4220                         }
 4221                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 4222                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
 4223                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 4224                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
 4225                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 4226                             (void *)ro->ro_rt);
 4227 
 4228                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4229                                 /* failed to prepend data, give up */
 4230                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4231                                 sctp_m_freem(m);
 4232                                 return (ENOMEM);
 4233                         }
 4234                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4235                         if (port) {
 4236                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
 4237                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4238                                 if (V_udp_cksum) {
 4239                                         SCTP_ENABLE_UDP_CSUM(o_pak);
 4240                                 }
 4241                         } else {
 4242                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
 4243                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4244                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4245                         }
 4246 #ifdef SCTP_PACKET_LOGGING
 4247                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4248                                 sctp_packet_log(o_pak);
 4249 #endif
 4250                         /* send it out.  table id is taken from stcb */
 4251 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4252                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4253                                 so = SCTP_INP_SO(inp);
 4254                                 SCTP_SOCKET_UNLOCK(so, 0);
 4255                         }
 4256 #endif
 4257                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
 4258                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
 4259 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4260                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4261                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4262                                 SCTP_TCB_UNLOCK(stcb);
 4263                                 SCTP_SOCKET_LOCK(so, 0);
 4264                                 SCTP_TCB_LOCK(stcb);
 4265                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4266                         }
 4267 #endif
 4268                         if (port) {
 4269                                 UDPSTAT_INC(udps_opackets);
 4270                         }
 4271                         SCTP_STAT_INCR(sctps_sendpackets);
 4272                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4273                         if (ret)
 4274                                 SCTP_STAT_INCR(sctps_senderrors);
 4275 
 4276                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 4277                         if (net == NULL) {
 4278                                 /* free tempy routes */
 4279                                 RO_RTFREE(ro);
 4280                         } else {
 4281                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
 4282                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
 4283                                         uint32_t mtu;
 4284 
 4285                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4286                                         if (mtu > 0) {
 4287                                                 if (net->port) {
 4288                                                         mtu -= sizeof(struct udphdr);
 4289                                                 }
 4290                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
 4291                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4292                                                 }
 4293                                                 net->mtu = mtu;
 4294                                         }
 4295                                 } else if (ro->ro_rt == NULL) {
 4296                                         /* route was freed */
 4297                                         if (net->ro._s_addr &&
 4298                                             net->src_addr_selected) {
 4299                                                 sctp_free_ifa(net->ro._s_addr);
 4300                                                 net->ro._s_addr = NULL;
 4301                                         }
 4302                                         net->src_addr_selected = 0;
 4303                                 }
 4304                         }
 4305                         return (ret);
 4306                 }
 4307 #endif
 4308 #ifdef INET6
 4309         case AF_INET6:
 4310                 {
 4311                         uint32_t flowlabel, flowinfo;
 4312                         struct ip6_hdr *ip6h;
 4313                         struct route_in6 ip6route;
 4314                         struct ifnet *ifp;
 4315                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 4316                         int prev_scope = 0;
 4317                         struct sockaddr_in6 lsa6_storage;
 4318                         int error;
 4319                         u_short prev_port = 0;
 4320                         int len;
 4321 
 4322                         if (net) {
 4323                                 flowlabel = net->flowlabel;
 4324                         } else if (stcb) {
 4325                                 flowlabel = stcb->asoc.default_flowlabel;
 4326                         } else {
 4327                                 flowlabel = inp->sctp_ep.default_flowlabel;
 4328                         }
 4329                         if (flowlabel == 0) {
 4330                                 /*
 4331                                  * This means especially, that it is not set
 4332                                  * at the SCTP layer. So use the value from
 4333                                  * the IP layer.
 4334                                  */
 4335                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
 4336                         }
 4337                         flowlabel &= 0x000fffff;
 4338                         len = SCTP_MIN_OVERHEAD;
 4339                         if (port) {
 4340                                 len += sizeof(struct udphdr);
 4341                         }
 4342                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4343                         if (newm == NULL) {
 4344                                 sctp_m_freem(m);
 4345                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4346                                 return (ENOMEM);
 4347                         }
 4348                         SCTP_ALIGN_TO_END(newm, len);
 4349                         SCTP_BUF_LEN(newm) = len;
 4350                         SCTP_BUF_NEXT(newm) = m;
 4351                         m = newm;
 4352                         if (net != NULL) {
 4353                                 m->m_pkthdr.flowid = net->flowid;
 4354                                 M_HASHTYPE_SET(m, net->flowtype);
 4355                         } else {
 4356                                 m->m_pkthdr.flowid = mflowid;
 4357                                 M_HASHTYPE_SET(m, mflowtype);
 4358                         }
 4359                         packet_length = sctp_calculate_len(m);
 4360 
 4361                         ip6h = mtod(m, struct ip6_hdr *);
 4362                         /* protect *sin6 from overwrite */
 4363                         sin6 = (struct sockaddr_in6 *)to;
 4364                         tmp = *sin6;
 4365                         sin6 = &tmp;
 4366 
 4367                         /* KAME hack: embed scopeid */
 4368                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4369                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4370                                 sctp_m_freem(m);
 4371                                 return (EINVAL);
 4372                         }
 4373                         if (net == NULL) {
 4374                                 memset(&ip6route, 0, sizeof(ip6route));
 4375                                 ro = (sctp_route_t *)&ip6route;
 4376                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 4377                         } else {
 4378                                 ro = (sctp_route_t *)&net->ro;
 4379                         }
 4380                         /*
 4381                          * We assume here that inp_flow is in host byte
 4382                          * order within the TCB!
 4383                          */
 4384                         if (tos_value == 0) {
 4385                                 /*
 4386                                  * This means especially, that it is not set
 4387                                  * at the SCTP layer. So use the value from
 4388                                  * the IP layer.
 4389                                  */
 4390                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
 4391                         }
 4392                         tos_value &= 0xfc;
 4393                         if (ecn_ok) {
 4394                                 tos_value |= sctp_get_ect(stcb);
 4395                         }
 4396                         flowinfo = 0x06;
 4397                         flowinfo <<= 8;
 4398                         flowinfo |= tos_value;
 4399                         flowinfo <<= 20;
 4400                         flowinfo |= flowlabel;
 4401                         ip6h->ip6_flow = htonl(flowinfo);
 4402                         if (port) {
 4403                                 ip6h->ip6_nxt = IPPROTO_UDP;
 4404                         } else {
 4405                                 ip6h->ip6_nxt = IPPROTO_SCTP;
 4406                         }
 4407                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
 4408                         ip6h->ip6_dst = sin6->sin6_addr;
 4409 
 4410                         /*
 4411                          * Add SRC address selection here: we can only reuse
 4412                          * to a limited degree the kame src-addr-sel, since
 4413                          * we can try their selection but it may not be
 4414                          * bound.
 4415                          */
 4416                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
 4417                         lsa6_tmp.sin6_family = AF_INET6;
 4418                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 4419                         lsa6 = &lsa6_tmp;
 4420                         if (net && out_of_asoc_ok == 0) {
 4421                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4422                                         sctp_free_ifa(net->ro._s_addr);
 4423                                         net->ro._s_addr = NULL;
 4424                                         net->src_addr_selected = 0;
 4425                                         if (ro->ro_rt) {
 4426                                                 RTFREE(ro->ro_rt);
 4427                                                 ro->ro_rt = NULL;
 4428                                         }
 4429                                 }
 4430                                 if (net->src_addr_selected == 0) {
 4431                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4432                                         /* KAME hack: embed scopeid */
 4433                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4434                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4435                                                 sctp_m_freem(m);
 4436                                                 return (EINVAL);
 4437                                         }
 4438                                         /* Cache the source address */
 4439                                         net->ro._s_addr = sctp_source_address_selection(inp,
 4440                                             stcb,
 4441                                             ro,
 4442                                             net,
 4443                                             0,
 4444                                             vrf_id);
 4445                                         (void)sa6_recoverscope(sin6);
 4446                                         net->src_addr_selected = 1;
 4447                                 }
 4448                                 if (net->ro._s_addr == NULL) {
 4449                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 4450                                         net->src_addr_selected = 0;
 4451                                         sctp_handle_no_route(stcb, net, so_locked);
 4452                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4453                                         sctp_m_freem(m);
 4454                                         return (EHOSTUNREACH);
 4455                                 }
 4456                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 4457                         } else {
 4458                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 4459                                 /* KAME hack: embed scopeid */
 4460                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4461                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4462                                         sctp_m_freem(m);
 4463                                         return (EINVAL);
 4464                                 }
 4465                                 if (over_addr == NULL) {
 4466                                         struct sctp_ifa *_lsrc;
 4467 
 4468                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4469                                             net,
 4470                                             out_of_asoc_ok,
 4471                                             vrf_id);
 4472                                         if (_lsrc == NULL) {
 4473                                                 sctp_handle_no_route(stcb, net, so_locked);
 4474                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4475                                                 sctp_m_freem(m);
 4476                                                 return (EHOSTUNREACH);
 4477                                         }
 4478                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 4479                                         sctp_free_ifa(_lsrc);
 4480                                 } else {
 4481                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
 4482                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4483                                 }
 4484                                 (void)sa6_recoverscope(sin6);
 4485                         }
 4486                         lsa6->sin6_port = inp->sctp_lport;
 4487 
 4488                         if (ro->ro_rt == NULL) {
 4489                                 /*
 4490                                  * src addr selection failed to find a route
 4491                                  * (or valid source addr), so we can't get
 4492                                  * there from here!
 4493                                  */
 4494                                 sctp_handle_no_route(stcb, net, so_locked);
 4495                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4496                                 sctp_m_freem(m);
 4497                                 return (EHOSTUNREACH);
 4498                         }
 4499                         /*
 4500                          * XXX: sa6 may not have a valid sin6_scope_id in
 4501                          * the non-SCOPEDROUTING case.
 4502                          */
 4503                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
 4504                         lsa6_storage.sin6_family = AF_INET6;
 4505                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
 4506                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4507                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 4508                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 4509                                 sctp_m_freem(m);
 4510                                 return (error);
 4511                         }
 4512                         /* XXX */
 4513                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4514                         lsa6_storage.sin6_port = inp->sctp_lport;
 4515                         lsa6 = &lsa6_storage;
 4516                         ip6h->ip6_src = lsa6->sin6_addr;
 4517 
 4518                         if (port) {
 4519                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4520                                         sctp_handle_no_route(stcb, net, so_locked);
 4521                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4522                                         sctp_m_freem(m);
 4523                                         return (EHOSTUNREACH);
 4524                                 }
 4525                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4526                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4527                                 udp->uh_dport = port;
 4528                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
 4529                                 udp->uh_sum = 0;
 4530                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4531                         } else {
 4532                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4533                         }
 4534 
 4535                         sctphdr->src_port = src_port;
 4536                         sctphdr->dest_port = dest_port;
 4537                         sctphdr->v_tag = v_tag;
 4538                         sctphdr->checksum = 0;
 4539 
 4540                         /*
 4541                          * We set the hop limit now since there is a good
 4542                          * chance that our ro pointer is now filled
 4543                          */
 4544                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 4545                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4546 
 4547 #ifdef SCTP_DEBUG
 4548                         /* Copy to be sure something bad is not happening */
 4549                         sin6->sin6_addr = ip6h->ip6_dst;
 4550                         lsa6->sin6_addr = ip6h->ip6_src;
 4551 #endif
 4552 
 4553                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 4554                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 4555                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 4556                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 4557                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 4558                         if (net) {
 4559                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4560                                 /*
 4561                                  * preserve the port and scope for link
 4562                                  * local send
 4563                                  */
 4564                                 prev_scope = sin6->sin6_scope_id;
 4565                                 prev_port = sin6->sin6_port;
 4566                         }
 4567 
 4568                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4569                                 /* failed to prepend data, give up */
 4570                                 sctp_m_freem(m);
 4571                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4572                                 return (ENOMEM);
 4573                         }
 4574                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4575                         if (port) {
 4576                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
 4577                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4578                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 4579                                         udp->uh_sum = 0xffff;
 4580                                 }
 4581                         } else {
 4582                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
 4583                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4584                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4585                         }
 4586                         /* send it out. table id is taken from stcb */
 4587 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4588                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4589                                 so = SCTP_INP_SO(inp);
 4590                                 SCTP_SOCKET_UNLOCK(so, 0);
 4591                         }
 4592 #endif
 4593 #ifdef SCTP_PACKET_LOGGING
 4594                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4595                                 sctp_packet_log(o_pak);
 4596 #endif
 4597                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
 4598                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
 4599 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4600                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4601                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4602                                 SCTP_TCB_UNLOCK(stcb);
 4603                                 SCTP_SOCKET_LOCK(so, 0);
 4604                                 SCTP_TCB_LOCK(stcb);
 4605                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4606                         }
 4607 #endif
 4608                         if (net) {
 4609                                 /* for link local this must be done */
 4610                                 sin6->sin6_scope_id = prev_scope;
 4611                                 sin6->sin6_port = prev_port;
 4612                         }
 4613                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 4614                         if (port) {
 4615                                 UDPSTAT_INC(udps_opackets);
 4616                         }
 4617                         SCTP_STAT_INCR(sctps_sendpackets);
 4618                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4619                         if (ret) {
 4620                                 SCTP_STAT_INCR(sctps_senderrors);
 4621                         }
 4622                         if (net == NULL) {
 4623                                 /* Now if we had a temp route free it */
 4624                                 RO_RTFREE(ro);
 4625                         } else {
 4626                                 /*
 4627                                  * PMTU check versus smallest asoc MTU goes
 4628                                  * here
 4629                                  */
 4630                                 if (ro->ro_rt == NULL) {
 4631                                         /* Route was freed */
 4632                                         if (net->ro._s_addr &&
 4633                                             net->src_addr_selected) {
 4634                                                 sctp_free_ifa(net->ro._s_addr);
 4635                                                 net->ro._s_addr = NULL;
 4636                                         }
 4637                                         net->src_addr_selected = 0;
 4638                                 }
 4639                                 if ((ro->ro_rt != NULL) && (net->ro._s_addr) &&
 4640                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
 4641                                         uint32_t mtu;
 4642 
 4643                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4644                                         if (mtu > 0) {
 4645                                                 if (net->port) {
 4646                                                         mtu -= sizeof(struct udphdr);
 4647                                                 }
 4648                                                 if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
 4649                                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4650                                                 }
 4651                                                 net->mtu = mtu;
 4652                                         }
 4653                                 } else if (ifp) {
 4654                                         if (ND_IFINFO(ifp)->linkmtu &&
 4655                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 4656                                                 sctp_mtu_size_reset(inp,
 4657                                                     &stcb->asoc,
 4658                                                     ND_IFINFO(ifp)->linkmtu);
 4659                                         }
 4660                                 }
 4661                         }
 4662                         return (ret);
 4663                 }
 4664 #endif
 4665         default:
 4666                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 4667                     ((struct sockaddr *)to)->sa_family);
 4668                 sctp_m_freem(m);
 4669                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4670                 return (EFAULT);
 4671         }
 4672 }
 4673 
 4674 
 4675 void
 4676 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
 4677 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 4678     SCTP_UNUSED
 4679 #endif
 4680 )
 4681 {
 4682         struct mbuf *m, *m_last;
 4683         struct sctp_nets *net;
 4684         struct sctp_init_chunk *init;
 4685         struct sctp_supported_addr_param *sup_addr;
 4686         struct sctp_adaptation_layer_indication *ali;
 4687         struct sctp_supported_chunk_types_param *pr_supported;
 4688         struct sctp_paramhdr *ph;
 4689         int cnt_inits_to = 0;
 4690         int error;
 4691         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 4692 
 4693         /* INIT's always go to the primary (and usually ONLY address) */
 4694         net = stcb->asoc.primary_destination;
 4695         if (net == NULL) {
 4696                 net = TAILQ_FIRST(&stcb->asoc.nets);
 4697                 if (net == NULL) {
 4698                         /* TSNH */
 4699                         return;
 4700                 }
 4701                 /* we confirm any address we send an INIT to */
 4702                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4703                 (void)sctp_set_primary_addr(stcb, NULL, net);
 4704         } else {
 4705                 /* we confirm any address we send an INIT to */
 4706                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4707         }
 4708         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 4709 #ifdef INET6
 4710         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 4711                 /*
 4712                  * special hook, if we are sending to link local it will not
 4713                  * show up in our private address count.
 4714                  */
 4715                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
 4716                         cnt_inits_to = 1;
 4717         }
 4718 #endif
 4719         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 4720                 /* This case should not happen */
 4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 4722                 return;
 4723         }
 4724         /* start the INIT timer */
 4725         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 4726 
 4727         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
 4728         if (m == NULL) {
 4729                 /* No memory, INIT timer will re-attempt. */
 4730                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 4731                 return;
 4732         }
 4733         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
 4734         padding_len = 0;
 4735         /* Now lets put the chunk header in place */
 4736         init = mtod(m, struct sctp_init_chunk *);
 4737         /* now the chunk header */
 4738         init->ch.chunk_type = SCTP_INITIATION;
 4739         init->ch.chunk_flags = 0;
 4740         /* fill in later from mbuf we build */
 4741         init->ch.chunk_length = 0;
 4742         /* place in my tag */
 4743         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
 4744         /* set up some of the credits. */
 4745         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
 4746             SCTP_MINIMAL_RWND));
 4747         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 4748         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 4749         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 4750 
 4751         /* Adaptation layer indication parameter */
 4752         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 4753                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 4754                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 4755                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 4756                 ali->ph.param_length = htons(parameter_len);
 4757                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 4758                 chunk_len += parameter_len;
 4759         }
 4760 
 4761         /* ECN parameter */
 4762         if (stcb->asoc.ecn_supported == 1) {
 4763                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4764                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4765                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 4766                 ph->param_length = htons(parameter_len);
 4767                 chunk_len += parameter_len;
 4768         }
 4769 
 4770         /* PR-SCTP supported parameter */
 4771         if (stcb->asoc.prsctp_supported == 1) {
 4772                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4774                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 4775                 ph->param_length = htons(parameter_len);
 4776                 chunk_len += parameter_len;
 4777         }
 4778 
 4779         /* Add NAT friendly parameter. */
 4780         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
 4781                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4782                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4783                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 4784                 ph->param_length = htons(parameter_len);
 4785                 chunk_len += parameter_len;
 4786         }
 4787 
 4788         /* And now tell the peer which extensions we support */
 4789         num_ext = 0;
 4790         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 4791         if (stcb->asoc.prsctp_supported == 1) {
 4792                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 4793                 if (stcb->asoc.idata_supported) {
 4794                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
 4795                 }
 4796         }
 4797         if (stcb->asoc.auth_supported == 1) {
 4798                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 4799         }
 4800         if (stcb->asoc.asconf_supported == 1) {
 4801                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 4802                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 4803         }
 4804         if (stcb->asoc.reconfig_supported == 1) {
 4805                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 4806         }
 4807         if (stcb->asoc.idata_supported) {
 4808                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
 4809         }
 4810         if (stcb->asoc.nrsack_supported == 1) {
 4811                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 4812         }
 4813         if (stcb->asoc.pktdrop_supported == 1) {
 4814                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 4815         }
 4816         if (num_ext > 0) {
 4817                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 4818                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 4819                 pr_supported->ph.param_length = htons(parameter_len);
 4820                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4821                 chunk_len += parameter_len;
 4822         }
 4823         /* add authentication parameters */
 4824         if (stcb->asoc.auth_supported) {
 4825                 /* attach RANDOM parameter, if available */
 4826                 if (stcb->asoc.authinfo.random != NULL) {
 4827                         struct sctp_auth_random *randp;
 4828 
 4829                         if (padding_len > 0) {
 4830                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4831                                 chunk_len += padding_len;
 4832                                 padding_len = 0;
 4833                         }
 4834                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 4835                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
 4836                         /* random key already contains the header */
 4837                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
 4838                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4839                         chunk_len += parameter_len;
 4840                 }
 4841                 /* add HMAC_ALGO parameter */
 4842                 if (stcb->asoc.local_hmacs != NULL) {
 4843                         struct sctp_auth_hmac_algo *hmacs;
 4844 
 4845                         if (padding_len > 0) {
 4846                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4847                                 chunk_len += padding_len;
 4848                                 padding_len = 0;
 4849                         }
 4850                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 4851                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
 4852                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
 4853                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 4854                         hmacs->ph.param_length = htons(parameter_len);
 4855                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
 4856                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4857                         chunk_len += parameter_len;
 4858                 }
 4859                 /* add CHUNKS parameter */
 4860                 if (stcb->asoc.local_auth_chunks != NULL) {
 4861                         struct sctp_auth_chunk_list *chunks;
 4862 
 4863                         if (padding_len > 0) {
 4864                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4865                                 chunk_len += padding_len;
 4866                                 padding_len = 0;
 4867                         }
 4868                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 4869                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
 4870                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
 4871                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 4872                         chunks->ph.param_length = htons(parameter_len);
 4873                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
 4874                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4875                         chunk_len += parameter_len;
 4876                 }
 4877         }
 4878 
 4879         /* now any cookie time extensions */
 4880         if (stcb->asoc.cookie_preserve_req) {
 4881                 struct sctp_cookie_perserve_param *cookie_preserve;
 4882 
 4883                 if (padding_len > 0) {
 4884                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4885                         chunk_len += padding_len;
 4886                         padding_len = 0;
 4887                 }
 4888                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
 4889                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
 4890                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 4891                 cookie_preserve->ph.param_length = htons(parameter_len);
 4892                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 4893                 stcb->asoc.cookie_preserve_req = 0;
 4894                 chunk_len += parameter_len;
 4895         }
 4896 
 4897         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
 4898                 uint8_t i;
 4899 
 4900                 if (padding_len > 0) {
 4901                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4902                         chunk_len += padding_len;
 4903                         padding_len = 0;
 4904                 }
 4905                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4906                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4907                         parameter_len += (uint16_t)sizeof(uint16_t);
 4908                 }
 4909                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4910                         parameter_len += (uint16_t)sizeof(uint16_t);
 4911                 }
 4912                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
 4913                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 4914                 sup_addr->ph.param_length = htons(parameter_len);
 4915                 i = 0;
 4916                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4917                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
 4918                 }
 4919                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4920                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
 4921                 }
 4922                 padding_len = 4 - 2 * i;
 4923                 chunk_len += parameter_len;
 4924         }
 4925 
 4926         SCTP_BUF_LEN(m) = chunk_len;
 4927         /* now the addresses */
 4928         /*
 4929          * To optimize this we could put the scoping stuff into a structure
 4930          * and remove the individual uint8's from the assoc structure. Then
 4931          * we could just sifa in the address within the stcb. But for now
 4932          * this is a quick hack to get the address stuff teased apart.
 4933          */
 4934         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
 4935             m, cnt_inits_to,
 4936             &padding_len, &chunk_len);
 4937 
 4938         init->ch.chunk_length = htons(chunk_len);
 4939         if (padding_len > 0) {
 4940                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 4941                         sctp_m_freem(m);
 4942                         return;
 4943                 }
 4944         }
 4945         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 4946         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 4947             (struct sockaddr *)&net->ro._l_addr,
 4948             m, 0, NULL, 0, 0, 0, 0,
 4949             inp->sctp_lport, stcb->rport, htonl(0),
 4950             net->port, NULL,
 4951             0, 0,
 4952             so_locked))) {
 4953                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 4954                 if (error == ENOBUFS) {
 4955                         stcb->asoc.ifp_had_enobuf = 1;
 4956                         SCTP_STAT_INCR(sctps_lowlevelerr);
 4957                 }
 4958         } else {
 4959                 stcb->asoc.ifp_had_enobuf = 0;
 4960         }
 4961         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 4962         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 4963 }
 4964 
 4965 struct mbuf *
 4966 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 4967     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
 4968 {
 4969         /*
 4970          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 4971          * being equal to the beginning of the params i.e. (iphlen +
 4972          * sizeof(struct sctp_init_msg) parse through the parameters to the
 4973          * end of the mbuf verifying that all parameters are known.
 4974          *
 4975          * For unknown parameters build and return a mbuf with
 4976          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 4977          * processing this chunk stop, and set *abort_processing to 1.
 4978          *
 4979          * By having param_offset be pre-set to where parameters begin it is
 4980          * hoped that this routine may be reused in the future by new
 4981          * features.
 4982          */
 4983         struct sctp_paramhdr *phdr, params;
 4984 
 4985         struct mbuf *mat, *op_err;
 4986         int at, limit, pad_needed;
 4987         uint16_t ptype, plen, padded_size;
 4988         int err_at;
 4989 
 4990         *abort_processing = 0;
 4991         mat = in_initpkt;
 4992         err_at = 0;
 4993         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 4994         at = param_offset;
 4995         op_err = NULL;
 4996         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 4997         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4998         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 4999                 ptype = ntohs(phdr->param_type);
 5000                 plen = ntohs(phdr->param_length);
 5001                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 5002                         /* wacked parameter */
 5003                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 5004                         goto invalid_size;
 5005                 }
 5006                 limit -= SCTP_SIZE32(plen);
 5007                 /*-
 5008                  * All parameters for all chunks that we know/understand are
 5009                  * listed here. We process them other places and make
 5010                  * appropriate stop actions per the upper bits. However this
 5011                  * is the generic routine processor's can call to get back
 5012                  * an operr.. to either incorporate (init-ack) or send.
 5013                  */
 5014                 padded_size = SCTP_SIZE32(plen);
 5015                 switch (ptype) {
 5016                         /* Param's with variable size */
 5017                 case SCTP_HEARTBEAT_INFO:
 5018                 case SCTP_STATE_COOKIE:
 5019                 case SCTP_UNRECOG_PARAM:
 5020                 case SCTP_ERROR_CAUSE_IND:
 5021                         /* ok skip fwd */
 5022                         at += padded_size;
 5023                         break;
 5024                         /* Param's with variable size within a range */
 5025                 case SCTP_CHUNK_LIST:
 5026                 case SCTP_SUPPORTED_CHUNK_EXT:
 5027                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 5028                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 5029                                 goto invalid_size;
 5030                         }
 5031                         at += padded_size;
 5032                         break;
 5033                 case SCTP_SUPPORTED_ADDRTYPE:
 5034                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 5035                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 5036                                 goto invalid_size;
 5037                         }
 5038                         at += padded_size;
 5039                         break;
 5040                 case SCTP_RANDOM:
 5041                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 5042                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 5043                                 goto invalid_size;
 5044                         }
 5045                         at += padded_size;
 5046                         break;
 5047                 case SCTP_SET_PRIM_ADDR:
 5048                 case SCTP_DEL_IP_ADDRESS:
 5049                 case SCTP_ADD_IP_ADDRESS:
 5050                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 5051                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 5053                                 goto invalid_size;
 5054                         }
 5055                         at += padded_size;
 5056                         break;
 5057                         /* Param's with a fixed size */
 5058                 case SCTP_IPV4_ADDRESS:
 5059                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 5060                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 5061                                 goto invalid_size;
 5062                         }
 5063                         at += padded_size;
 5064                         break;
 5065                 case SCTP_IPV6_ADDRESS:
 5066                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 5067                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 5068                                 goto invalid_size;
 5069                         }
 5070                         at += padded_size;
 5071                         break;
 5072                 case SCTP_COOKIE_PRESERVE:
 5073                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 5074                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 5075                                 goto invalid_size;
 5076                         }
 5077                         at += padded_size;
 5078                         break;
 5079                 case SCTP_HAS_NAT_SUPPORT:
 5080                         *nat_friendly = 1;
 5081                         /* fall through */
 5082                 case SCTP_PRSCTP_SUPPORTED:
 5083                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5084                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
 5085                                 goto invalid_size;
 5086                         }
 5087                         at += padded_size;
 5088                         break;
 5089                 case SCTP_ECN_CAPABLE:
 5090                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5091                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 5092                                 goto invalid_size;
 5093                         }
 5094                         at += padded_size;
 5095                         break;
 5096                 case SCTP_ULP_ADAPTATION:
 5097                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 5098                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 5099                                 goto invalid_size;
 5100                         }
 5101                         at += padded_size;
 5102                         break;
 5103                 case SCTP_SUCCESS_REPORT:
 5104                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 5105                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 5106                                 goto invalid_size;
 5107                         }
 5108                         at += padded_size;
 5109                         break;
 5110                 case SCTP_HOSTNAME_ADDRESS:
 5111                         {
 5112                                 /* We can NOT handle HOST NAME addresses!! */
 5113                                 int l_len;
 5114 
 5115                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 5116                                 *abort_processing = 1;
 5117                                 if (op_err == NULL) {
 5118                                         /* Ok need to try to get a mbuf */
 5119 #ifdef INET6
 5120                                         l_len = SCTP_MIN_OVERHEAD;
 5121 #else
 5122                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5123 #endif
 5124                                         l_len += sizeof(struct sctp_chunkhdr);
 5125                                         l_len += sizeof(struct sctp_gen_error_cause);
 5126                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5127                                         if (op_err) {
 5128                                                 SCTP_BUF_LEN(op_err) = 0;
 5129                                                 /*
 5130                                                  * Pre-reserve space for IP,
 5131                                                  * SCTP, and chunk header.
 5132                                                  */
 5133 #ifdef INET6
 5134                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5135 #else
 5136                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5137 #endif
 5138                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5139                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5140                                         }
 5141                                 }
 5142                                 if (op_err) {
 5143                                         /* If we have space */
 5144                                         struct sctp_gen_error_cause cause;
 5145 
 5146                                         if (err_at % 4) {
 5147                                                 uint32_t cpthis = 0;
 5148 
 5149                                                 pad_needed = 4 - (err_at % 4);
 5150                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5151                                                 err_at += pad_needed;
 5152                                         }
 5153                                         cause.code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 5154                                         cause.length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
 5155                                         m_copyback(op_err, err_at, sizeof(struct sctp_gen_error_cause), (caddr_t)&cause);
 5156                                         err_at += sizeof(struct sctp_gen_error_cause);
 5157                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
 5158                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
 5159                                                 sctp_m_freem(op_err);
 5160                                                 return (NULL);
 5161                                         }
 5162                                 }
 5163                                 return (op_err);
 5164                                 break;
 5165                         }
 5166                 default:
 5167                         /*
 5168                          * we do not recognize the parameter figure out what
 5169                          * we do.
 5170                          */
 5171                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 5172                         if ((ptype & 0x4000) == 0x4000) {
 5173                                 /* Report bit is set?? */
 5174                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 5175                                 if (op_err == NULL) {
 5176                                         int l_len;
 5177 
 5178                                         /* Ok need to try to get an mbuf */
 5179 #ifdef INET6
 5180                                         l_len = SCTP_MIN_OVERHEAD;
 5181 #else
 5182                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5183 #endif
 5184                                         l_len += sizeof(struct sctp_chunkhdr);
 5185                                         l_len += sizeof(struct sctp_paramhdr);
 5186                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5187                                         if (op_err) {
 5188                                                 SCTP_BUF_LEN(op_err) = 0;
 5189 #ifdef INET6
 5190                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5191 #else
 5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5193 #endif
 5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5195                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5196                                         }
 5197                                 }
 5198                                 if (op_err) {
 5199                                         /* If we have space */
 5200                                         struct sctp_paramhdr s;
 5201 
 5202                                         if (err_at % 4) {
 5203                                                 uint32_t cpthis = 0;
 5204 
 5205                                                 pad_needed = 4 - (err_at % 4);
 5206                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5207                                                 err_at += pad_needed;
 5208                                         }
 5209                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
 5210                                         s.param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
 5211                                         m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)&s);
 5212                                         err_at += sizeof(struct sctp_paramhdr);
 5213                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
 5214                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
 5215                                                 sctp_m_freem(op_err);
 5216                                                 /*
 5217                                                  * we are out of memory but
 5218                                                  * we still need to have a
 5219                                                  * look at what to do (the
 5220                                                  * system is in trouble
 5221                                                  * though).
 5222                                                  */
 5223                                                 op_err = NULL;
 5224                                                 goto more_processing;
 5225                                         }
 5226                                         err_at += plen;
 5227                                 }
 5228                         }
 5229         more_processing:
 5230                         if ((ptype & 0x8000) == 0x0000) {
 5231                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 5232                                 return (op_err);
 5233                         } else {
 5234                                 /* skip this chunk and continue processing */
 5235                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 5236                                 at += SCTP_SIZE32(plen);
 5237                         }
 5238                         break;
 5239 
 5240                 }
 5241                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 5242         }
 5243         return (op_err);
 5244 invalid_size:
 5245         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 5246         *abort_processing = 1;
 5247         if ((op_err == NULL) && phdr) {
 5248                 int l_len;
 5249 #ifdef INET6
 5250                 l_len = SCTP_MIN_OVERHEAD;
 5251 #else
 5252                 l_len = SCTP_MIN_V4_OVERHEAD;
 5253 #endif
 5254                 l_len += sizeof(struct sctp_chunkhdr);
 5255                 l_len += (2 * sizeof(struct sctp_paramhdr));
 5256                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5257                 if (op_err) {
 5258                         SCTP_BUF_LEN(op_err) = 0;
 5259 #ifdef INET6
 5260                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5261 #else
 5262                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5263 #endif
 5264                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5266                 }
 5267         }
 5268         if ((op_err) && phdr) {
 5269                 struct sctp_paramhdr s;
 5270 
 5271                 if (err_at % 4) {
 5272                         uint32_t cpthis = 0;
 5273 
 5274                         pad_needed = 4 - (err_at % 4);
 5275                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5276                         err_at += pad_needed;
 5277                 }
 5278                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 5279                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
 5280                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5281                 err_at += sizeof(s);
 5282                 /* Only copy back the p-hdr that caused the issue */
 5283                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
 5284         }
 5285         return (op_err);
 5286 }
 5287 
 5288 static int
 5289 sctp_are_there_new_addresses(struct sctp_association *asoc,
 5290     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
 5291 {
 5292         /*
 5293          * Given a INIT packet, look through the packet to verify that there
 5294          * are NO new addresses. As we go through the parameters add reports
 5295          * of any un-understood parameters that require an error.  Also we
 5296          * must return (1) to drop the packet if we see a un-understood
 5297          * parameter that tells us to drop the chunk.
 5298          */
 5299         struct sockaddr *sa_touse;
 5300         struct sockaddr *sa;
 5301         struct sctp_paramhdr *phdr, params;
 5302         uint16_t ptype, plen;
 5303         uint8_t fnd;
 5304         struct sctp_nets *net;
 5305         int check_src;
 5306 #ifdef INET
 5307         struct sockaddr_in sin4, *sa4;
 5308 #endif
 5309 #ifdef INET6
 5310         struct sockaddr_in6 sin6, *sa6;
 5311 #endif
 5312 
 5313 #ifdef INET
 5314         memset(&sin4, 0, sizeof(sin4));
 5315         sin4.sin_family = AF_INET;
 5316         sin4.sin_len = sizeof(sin4);
 5317 #endif
 5318 #ifdef INET6
 5319         memset(&sin6, 0, sizeof(sin6));
 5320         sin6.sin6_family = AF_INET6;
 5321         sin6.sin6_len = sizeof(sin6);
 5322 #endif
 5323         /* First what about the src address of the pkt ? */
 5324         check_src = 0;
 5325         switch (src->sa_family) {
 5326 #ifdef INET
 5327         case AF_INET:
 5328                 if (asoc->scope.ipv4_addr_legal) {
 5329                         check_src = 1;
 5330                 }
 5331                 break;
 5332 #endif
 5333 #ifdef INET6
 5334         case AF_INET6:
 5335                 if (asoc->scope.ipv6_addr_legal) {
 5336                         check_src = 1;
 5337                 }
 5338                 break;
 5339 #endif
 5340         default:
 5341                 /* TSNH */
 5342                 break;
 5343         }
 5344         if (check_src) {
 5345                 fnd = 0;
 5346                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5347                         sa = (struct sockaddr *)&net->ro._l_addr;
 5348                         if (sa->sa_family == src->sa_family) {
 5349 #ifdef INET
 5350                                 if (sa->sa_family == AF_INET) {
 5351                                         struct sockaddr_in *src4;
 5352 
 5353                                         sa4 = (struct sockaddr_in *)sa;
 5354                                         src4 = (struct sockaddr_in *)src;
 5355                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
 5356                                                 fnd = 1;
 5357                                                 break;
 5358                                         }
 5359                                 }
 5360 #endif
 5361 #ifdef INET6
 5362                                 if (sa->sa_family == AF_INET6) {
 5363                                         struct sockaddr_in6 *src6;
 5364 
 5365                                         sa6 = (struct sockaddr_in6 *)sa;
 5366                                         src6 = (struct sockaddr_in6 *)src;
 5367                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
 5368                                                 fnd = 1;
 5369                                                 break;
 5370                                         }
 5371                                 }
 5372 #endif
 5373                         }
 5374                 }
 5375                 if (fnd == 0) {
 5376                         /* New address added! no need to look further. */
 5377                         return (1);
 5378                 }
 5379         }
 5380         /* Ok so far lets munge through the rest of the packet */
 5381         offset += sizeof(struct sctp_init_chunk);
 5382         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5383         while (phdr) {
 5384                 sa_touse = NULL;
 5385                 ptype = ntohs(phdr->param_type);
 5386                 plen = ntohs(phdr->param_length);
 5387                 switch (ptype) {
 5388 #ifdef INET
 5389                 case SCTP_IPV4_ADDRESS:
 5390                         {
 5391                                 struct sctp_ipv4addr_param *p4, p4_buf;
 5392 
 5393                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
 5394                                         return (1);
 5395                                 }
 5396                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5397                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 5398                                 if (phdr == NULL) {
 5399                                         return (1);
 5400                                 }
 5401                                 if (asoc->scope.ipv4_addr_legal) {
 5402                                         p4 = (struct sctp_ipv4addr_param *)phdr;
 5403                                         sin4.sin_addr.s_addr = p4->addr;
 5404                                         sa_touse = (struct sockaddr *)&sin4;
 5405                                 }
 5406                                 break;
 5407                         }
 5408 #endif
 5409 #ifdef INET6
 5410                 case SCTP_IPV6_ADDRESS:
 5411                         {
 5412                                 struct sctp_ipv6addr_param *p6, p6_buf;
 5413 
 5414                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
 5415                                         return (1);
 5416                                 }
 5417                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5418                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 5419                                 if (phdr == NULL) {
 5420                                         return (1);
 5421                                 }
 5422                                 if (asoc->scope.ipv6_addr_legal) {
 5423                                         p6 = (struct sctp_ipv6addr_param *)phdr;
 5424                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 5425                                             sizeof(p6->addr));
 5426                                         sa_touse = (struct sockaddr *)&sin6;
 5427                                 }
 5428                                 break;
 5429                         }
 5430 #endif
 5431                 default:
 5432                         sa_touse = NULL;
 5433                         break;
 5434                 }
 5435                 if (sa_touse) {
 5436                         /* ok, sa_touse points to one to check */
 5437                         fnd = 0;
 5438                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5439                                 sa = (struct sockaddr *)&net->ro._l_addr;
 5440                                 if (sa->sa_family != sa_touse->sa_family) {
 5441                                         continue;
 5442                                 }
 5443 #ifdef INET
 5444                                 if (sa->sa_family == AF_INET) {
 5445                                         sa4 = (struct sockaddr_in *)sa;
 5446                                         if (sa4->sin_addr.s_addr ==
 5447                                             sin4.sin_addr.s_addr) {
 5448                                                 fnd = 1;
 5449                                                 break;
 5450                                         }
 5451                                 }
 5452 #endif
 5453 #ifdef INET6
 5454                                 if (sa->sa_family == AF_INET6) {
 5455                                         sa6 = (struct sockaddr_in6 *)sa;
 5456                                         if (SCTP6_ARE_ADDR_EQUAL(
 5457                                             sa6, &sin6)) {
 5458                                                 fnd = 1;
 5459                                                 break;
 5460                                         }
 5461                                 }
 5462 #endif
 5463                         }
 5464                         if (!fnd) {
 5465                                 /* New addr added! no need to look further */
 5466                                 return (1);
 5467                         }
 5468                 }
 5469                 offset += SCTP_SIZE32(plen);
 5470                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5471         }
 5472         return (0);
 5473 }
 5474 
 5475 /*
 5476  * Given a MBUF chain that was sent into us containing an INIT. Build a
 5477  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 5478  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 5479  * message (i.e. the struct sctp_init_msg).
 5480  */
 5481 void
 5482 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 5483     struct sctp_nets *src_net, struct mbuf *init_pkt,
 5484     int iphlen, int offset,
 5485     struct sockaddr *src, struct sockaddr *dst,
 5486     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
 5487     uint8_t mflowtype, uint32_t mflowid,
 5488     uint32_t vrf_id, uint16_t port)
 5489 {
 5490         struct sctp_association *asoc;
 5491         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
 5492         struct sctp_init_ack_chunk *initack;
 5493         struct sctp_adaptation_layer_indication *ali;
 5494         struct sctp_supported_chunk_types_param *pr_supported;
 5495         struct sctp_paramhdr *ph;
 5496         union sctp_sockstore *over_addr;
 5497         struct sctp_scoping scp;
 5498         struct timeval now;
 5499 #ifdef INET
 5500         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
 5501         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
 5502         struct sockaddr_in *sin;
 5503 #endif
 5504 #ifdef INET6
 5505         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
 5506         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
 5507         struct sockaddr_in6 *sin6;
 5508 #endif
 5509         struct sockaddr *to;
 5510         struct sctp_state_cookie stc;
 5511         struct sctp_nets *net = NULL;
 5512         uint8_t *signature = NULL;
 5513         int cnt_inits_to = 0;
 5514         uint16_t his_limit, i_want;
 5515         int abort_flag;
 5516         int nat_friendly = 0;
 5517         int error;
 5518         struct socket *so;
 5519         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 5520 
 5521         if (stcb) {
 5522                 asoc = &stcb->asoc;
 5523         } else {
 5524                 asoc = NULL;
 5525         }
 5526         if ((asoc != NULL) &&
 5527             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
 5528                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
 5529                         /*
 5530                          * new addresses, out of here in non-cookie-wait
 5531                          * states
 5532                          *
 5533                          * Send an ABORT, without the new address error
 5534                          * cause. This looks no different than if no
 5535                          * listener was present.
 5536                          */
 5537                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5538                             "Address added");
 5539                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5540                             mflowtype, mflowid, inp->fibnum,
 5541                             vrf_id, port);
 5542                         return;
 5543                 }
 5544                 if (src_net != NULL && (src_net->port != port)) {
 5545                         /*
 5546                          * change of remote encapsulation port, out of here
 5547                          * in non-cookie-wait states
 5548                          *
 5549                          * Send an ABORT, without an specific error cause.
 5550                          * This looks no different than if no listener was
 5551                          * present.
 5552                          */
 5553                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5554                             "Remote encapsulation port changed");
 5555                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5556                             mflowtype, mflowid, inp->fibnum,
 5557                             vrf_id, port);
 5558                         return;
 5559                 }
 5560         }
 5561         abort_flag = 0;
 5562         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 5563             (offset + sizeof(struct sctp_init_chunk)),
 5564             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
 5565         if (abort_flag) {
 5566 do_a_abort:
 5567                 if (op_err == NULL) {
 5568                         char msg[SCTP_DIAG_INFO_LEN];
 5569 
 5570                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
 5571                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5572                             msg);
 5573                 }
 5574                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
 5575                     init_chk->init.initiate_tag, op_err,
 5576                     mflowtype, mflowid, inp->fibnum,
 5577                     vrf_id, port);
 5578                 return;
 5579         }
 5580         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 5581         if (m == NULL) {
 5582                 /* No memory, INIT timer will re-attempt. */
 5583                 if (op_err)
 5584                         sctp_m_freem(op_err);
 5585                 return;
 5586         }
 5587         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
 5588         padding_len = 0;
 5589 
 5590         /*
 5591          * We might not overwrite the identification[] completely and on
 5592          * some platforms time_entered will contain some padding. Therefore
 5593          * zero out the cookie to avoid putting uninitialized memory on the
 5594          * wire.
 5595          */
 5596         memset(&stc, 0, sizeof(struct sctp_state_cookie));
 5597 
 5598         /* the time I built cookie */
 5599         (void)SCTP_GETTIME_TIMEVAL(&now);
 5600         stc.time_entered.tv_sec = now.tv_sec;
 5601         stc.time_entered.tv_usec = now.tv_usec;
 5602 
 5603         /* populate any tie tags */
 5604         if (asoc != NULL) {
 5605                 /* unlock before tag selections */
 5606                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
 5607                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
 5608                 stc.cookie_life = asoc->cookie_life;
 5609                 net = asoc->primary_destination;
 5610         } else {
 5611                 stc.tie_tag_my_vtag = 0;
 5612                 stc.tie_tag_peer_vtag = 0;
 5613                 /* life I will award this cookie */
 5614                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
 5615         }
 5616 
 5617         /* copy in the ports for later check */
 5618         stc.myport = sh->dest_port;
 5619         stc.peerport = sh->src_port;
 5620 
 5621         /*
 5622          * If we wanted to honor cookie life extensions, we would add to
 5623          * stc.cookie_life. For now we should NOT honor any extension
 5624          */
 5625         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
 5626         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 5627                 stc.ipv6_addr_legal = 1;
 5628                 if (SCTP_IPV6_V6ONLY(inp)) {
 5629                         stc.ipv4_addr_legal = 0;
 5630                 } else {
 5631                         stc.ipv4_addr_legal = 1;
 5632                 }
 5633         } else {
 5634                 stc.ipv6_addr_legal = 0;
 5635                 stc.ipv4_addr_legal = 1;
 5636         }
 5637         stc.ipv4_scope = 0;
 5638         if (net == NULL) {
 5639                 to = src;
 5640                 switch (dst->sa_family) {
 5641 #ifdef INET
 5642                 case AF_INET:
 5643                         {
 5644                                 /* lookup address */
 5645                                 stc.address[0] = src4->sin_addr.s_addr;
 5646                                 stc.address[1] = 0;
 5647                                 stc.address[2] = 0;
 5648                                 stc.address[3] = 0;
 5649                                 stc.addr_type = SCTP_IPV4_ADDRESS;
 5650                                 /* local from address */
 5651                                 stc.laddress[0] = dst4->sin_addr.s_addr;
 5652                                 stc.laddress[1] = 0;
 5653                                 stc.laddress[2] = 0;
 5654                                 stc.laddress[3] = 0;
 5655                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
 5656                                 /* scope_id is only for v6 */
 5657                                 stc.scope_id = 0;
 5658                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
 5659                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
 5660                                         stc.ipv4_scope = 1;
 5661                                 }
 5662                                 /* Must use the address in this case */
 5663                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5664                                         stc.loopback_scope = 1;
 5665                                         stc.ipv4_scope = 1;
 5666                                         stc.site_scope = 1;
 5667                                         stc.local_scope = 0;
 5668                                 }
 5669                                 break;
 5670                         }
 5671 #endif
 5672 #ifdef INET6
 5673                 case AF_INET6:
 5674                         {
 5675                                 stc.addr_type = SCTP_IPV6_ADDRESS;
 5676                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
 5677                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
 5678                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5679                                         stc.loopback_scope = 1;
 5680                                         stc.local_scope = 0;
 5681                                         stc.site_scope = 1;
 5682                                         stc.ipv4_scope = 1;
 5683                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
 5684                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
 5685                                         /*
 5686                                          * If the new destination or source
 5687                                          * is a LINK_LOCAL we must have
 5688                                          * common both site and local scope.
 5689                                          * Don't set local scope though
 5690                                          * since we must depend on the
 5691                                          * source to be added implicitly. We
 5692                                          * cannot assure just because we
 5693                                          * share one link that all links are
 5694                                          * common.
 5695                                          */
 5696                                         stc.local_scope = 0;
 5697                                         stc.site_scope = 1;
 5698                                         stc.ipv4_scope = 1;
 5699                                         /*
 5700                                          * we start counting for the private
 5701                                          * address stuff at 1. since the
 5702                                          * link local we source from won't
 5703                                          * show up in our scoped count.
 5704                                          */
 5705                                         cnt_inits_to = 1;
 5706                                         /*
 5707                                          * pull out the scope_id from
 5708                                          * incoming pkt
 5709                                          */
 5710                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
 5711                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
 5712                                         /*
 5713                                          * If the new destination or source
 5714                                          * is SITE_LOCAL then we must have
 5715                                          * site scope in common.
 5716                                          */
 5717                                         stc.site_scope = 1;
 5718                                 }
 5719                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
 5720                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
 5721                                 break;
 5722                         }
 5723 #endif
 5724                 default:
 5725                         /* TSNH */
 5726                         goto do_a_abort;
 5727                         break;
 5728                 }
 5729         } else {
 5730                 /* set the scope per the existing tcb */
 5731 
 5732 #ifdef INET6
 5733                 struct sctp_nets *lnet;
 5734 #endif
 5735 
 5736                 stc.loopback_scope = asoc->scope.loopback_scope;
 5737                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
 5738                 stc.site_scope = asoc->scope.site_scope;
 5739                 stc.local_scope = asoc->scope.local_scope;
 5740 #ifdef INET6
 5741                 /* Why do we not consider IPv4 LL addresses? */
 5742                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 5743                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
 5744                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
 5745                                         /*
 5746                                          * if we have a LL address, start
 5747                                          * counting at 1.
 5748                                          */
 5749                                         cnt_inits_to = 1;
 5750                                 }
 5751                         }
 5752                 }
 5753 #endif
 5754                 /* use the net pointer */
 5755                 to = (struct sockaddr *)&net->ro._l_addr;
 5756                 switch (to->sa_family) {
 5757 #ifdef INET
 5758                 case AF_INET:
 5759                         sin = (struct sockaddr_in *)to;
 5760                         stc.address[0] = sin->sin_addr.s_addr;
 5761                         stc.address[1] = 0;
 5762                         stc.address[2] = 0;
 5763                         stc.address[3] = 0;
 5764                         stc.addr_type = SCTP_IPV4_ADDRESS;
 5765                         if (net->src_addr_selected == 0) {
 5766                                 /*
 5767                                  * strange case here, the INIT should have
 5768                                  * did the selection.
 5769                                  */
 5770                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5771                                     stcb, (sctp_route_t *)&net->ro,
 5772                                     net, 0, vrf_id);
 5773                                 if (net->ro._s_addr == NULL)
 5774                                         return;
 5775 
 5776                                 net->src_addr_selected = 1;
 5777 
 5778                         }
 5779                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
 5780                         stc.laddress[1] = 0;
 5781                         stc.laddress[2] = 0;
 5782                         stc.laddress[3] = 0;
 5783                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 5784                         /* scope_id is only for v6 */
 5785                         stc.scope_id = 0;
 5786                         break;
 5787 #endif
 5788 #ifdef INET6
 5789                 case AF_INET6:
 5790                         sin6 = (struct sockaddr_in6 *)to;
 5791                         memcpy(&stc.address, &sin6->sin6_addr,
 5792                             sizeof(struct in6_addr));
 5793                         stc.addr_type = SCTP_IPV6_ADDRESS;
 5794                         stc.scope_id = sin6->sin6_scope_id;
 5795                         if (net->src_addr_selected == 0) {
 5796                                 /*
 5797                                  * strange case here, the INIT should have
 5798                                  * done the selection.
 5799                                  */
 5800                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5801                                     stcb, (sctp_route_t *)&net->ro,
 5802                                     net, 0, vrf_id);
 5803                                 if (net->ro._s_addr == NULL)
 5804                                         return;
 5805 
 5806                                 net->src_addr_selected = 1;
 5807                         }
 5808                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
 5809                             sizeof(struct in6_addr));
 5810                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 5811                         break;
 5812 #endif
 5813                 }
 5814         }
 5815         /* Now lets put the SCTP header in place */
 5816         initack = mtod(m, struct sctp_init_ack_chunk *);
 5817         /* Save it off for quick ref */
 5818         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
 5819         /* who are we */
 5820         memcpy(stc.identification, SCTP_VERSION_STRING,
 5821             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
 5822         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
 5823         /* now the chunk header */
 5824         initack->ch.chunk_type = SCTP_INITIATION_ACK;
 5825         initack->ch.chunk_flags = 0;
 5826         /* fill in later from mbuf we build */
 5827         initack->ch.chunk_length = 0;
 5828         /* place in my tag */
 5829         if ((asoc != NULL) &&
 5830             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 5831             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
 5832             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
 5833                 /* re-use the v-tags and init-seq here */
 5834                 initack->init.initiate_tag = htonl(asoc->my_vtag);
 5835                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
 5836         } else {
 5837                 uint32_t vtag, itsn;
 5838 
 5839                 if (asoc) {
 5840                         atomic_add_int(&asoc->refcnt, 1);
 5841                         SCTP_TCB_UNLOCK(stcb);
 5842         new_tag:
 5843                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5844                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
 5845                                 /*
 5846                                  * Got a duplicate vtag on some guy behind a
 5847                                  * nat make sure we don't use it.
 5848                                  */
 5849                                 goto new_tag;
 5850                         }
 5851                         initack->init.initiate_tag = htonl(vtag);
 5852                         /* get a TSN to use too */
 5853                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 5854                         initack->init.initial_tsn = htonl(itsn);
 5855                         SCTP_TCB_LOCK(stcb);
 5856                         atomic_add_int(&asoc->refcnt, -1);
 5857                 } else {
 5858                         SCTP_INP_INCR_REF(inp);
 5859                         SCTP_INP_RUNLOCK(inp);
 5860                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5861                         initack->init.initiate_tag = htonl(vtag);
 5862                         /* get a TSN to use too */
 5863                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 5864                         SCTP_INP_RLOCK(inp);
 5865                         SCTP_INP_DECR_REF(inp);
 5866                 }
 5867         }
 5868         /* save away my tag to */
 5869         stc.my_vtag = initack->init.initiate_tag;
 5870 
 5871         /* set up some of the credits. */
 5872         so = inp->sctp_socket;
 5873         if (so == NULL) {
 5874                 /* memory problem */
 5875                 sctp_m_freem(m);
 5876                 return;
 5877         } else {
 5878                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 5879         }
 5880         /* set what I want */
 5881         his_limit = ntohs(init_chk->init.num_inbound_streams);
 5882         /* choose what I want */
 5883         if (asoc != NULL) {
 5884                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
 5885                         i_want = asoc->streamoutcnt;
 5886                 } else {
 5887                         i_want = asoc->pre_open_streams;
 5888                 }
 5889         } else {
 5890                 i_want = inp->sctp_ep.pre_open_stream_count;
 5891         }
 5892         if (his_limit < i_want) {
 5893                 /* I Want more :< */
 5894                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
 5895         } else {
 5896                 /* I can have what I want :> */
 5897                 initack->init.num_outbound_streams = htons(i_want);
 5898         }
 5899         /* tell him his limit. */
 5900         initack->init.num_inbound_streams =
 5901             htons(inp->sctp_ep.max_open_streams_intome);
 5902 
 5903         /* adaptation layer indication parameter */
 5904         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 5905                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 5906                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 5907                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 5908                 ali->ph.param_length = htons(parameter_len);
 5909                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 5910                 chunk_len += parameter_len;
 5911         }
 5912 
 5913         /* ECN parameter */
 5914         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
 5915             ((asoc == NULL) && (inp->ecn_supported == 1))) {
 5916                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5917                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5918                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 5919                 ph->param_length = htons(parameter_len);
 5920                 chunk_len += parameter_len;
 5921         }
 5922 
 5923         /* PR-SCTP supported parameter */
 5924         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5925             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5926                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5927                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5928                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 5929                 ph->param_length = htons(parameter_len);
 5930                 chunk_len += parameter_len;
 5931         }
 5932 
 5933         /* Add NAT friendly parameter */
 5934         if (nat_friendly) {
 5935                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5936                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5937                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 5938                 ph->param_length = htons(parameter_len);
 5939                 chunk_len += parameter_len;
 5940         }
 5941 
 5942         /* And now tell the peer which extensions we support */
 5943         num_ext = 0;
 5944         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 5945         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5946             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5947                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 5948                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
 5949                     ((asoc == NULL) && (inp->idata_supported == 1))) {
 5950                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
 5951                 }
 5952         }
 5953         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5954             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5955                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 5956         }
 5957         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
 5958             ((asoc == NULL) && (inp->asconf_supported == 1))) {
 5959                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 5960                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 5961         }
 5962         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
 5963             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
 5964                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 5965         }
 5966         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
 5967             ((asoc == NULL) && (inp->idata_supported == 1))) {
 5968                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
 5969         }
 5970         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
 5971             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
 5972                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 5973         }
 5974         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
 5975             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
 5976                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 5977         }
 5978         if (num_ext > 0) {
 5979                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 5980                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 5981                 pr_supported->ph.param_length = htons(parameter_len);
 5982                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 5983                 chunk_len += parameter_len;
 5984         }
 5985 
 5986         /* add authentication parameters */
 5987         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5988             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5989                 struct sctp_auth_random *randp;
 5990                 struct sctp_auth_hmac_algo *hmacs;
 5991                 struct sctp_auth_chunk_list *chunks;
 5992 
 5993                 if (padding_len > 0) {
 5994                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 5995                         chunk_len += padding_len;
 5996                         padding_len = 0;
 5997                 }
 5998                 /* generate and add RANDOM parameter */
 5999                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 6000                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
 6001                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 6002                 randp->ph.param_type = htons(SCTP_RANDOM);
 6003                 randp->ph.param_length = htons(parameter_len);
 6004                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
 6005                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6006                 chunk_len += parameter_len;
 6007 
 6008                 if (padding_len > 0) {
 6009                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6010                         chunk_len += padding_len;
 6011                         padding_len = 0;
 6012                 }
 6013                 /* add HMAC_ALGO parameter */
 6014                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 6015                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
 6016                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 6017                     (uint8_t *)hmacs->hmac_ids);
 6018                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 6019                 hmacs->ph.param_length = htons(parameter_len);
 6020                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6021                 chunk_len += parameter_len;
 6022 
 6023                 if (padding_len > 0) {
 6024                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6025                         chunk_len += padding_len;
 6026                         padding_len = 0;
 6027                 }
 6028                 /* add CHUNKS parameter */
 6029                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 6030                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
 6031                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 6032                     chunks->chunk_types);
 6033                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 6034                 chunks->ph.param_length = htons(parameter_len);
 6035                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6036                 chunk_len += parameter_len;
 6037         }
 6038         SCTP_BUF_LEN(m) = chunk_len;
 6039         m_last = m;
 6040         /* now the addresses */
 6041         /*
 6042          * To optimize this we could put the scoping stuff into a structure
 6043          * and remove the individual uint8's from the stc structure. Then we
 6044          * could just sifa in the address within the stc.. but for now this
 6045          * is a quick hack to get the address stuff teased apart.
 6046          */
 6047         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 6048         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 6049         scp.loopback_scope = stc.loopback_scope;
 6050         scp.ipv4_local_scope = stc.ipv4_scope;
 6051         scp.local_scope = stc.local_scope;
 6052         scp.site_scope = stc.site_scope;
 6053         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
 6054             cnt_inits_to,
 6055             &padding_len, &chunk_len);
 6056         /* padding_len can only be positive, if no addresses have been added */
 6057         if (padding_len > 0) {
 6058                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6059                 chunk_len += padding_len;
 6060                 SCTP_BUF_LEN(m) += padding_len;
 6061                 padding_len = 0;
 6062         }
 6063 
 6064         /* tack on the operational error if present */
 6065         if (op_err) {
 6066                 parameter_len = 0;
 6067                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6068                         parameter_len += SCTP_BUF_LEN(m_tmp);
 6069                 }
 6070                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6071                 SCTP_BUF_NEXT(m_last) = op_err;
 6072                 while (SCTP_BUF_NEXT(m_last) != NULL) {
 6073                         m_last = SCTP_BUF_NEXT(m_last);
 6074                 }
 6075                 chunk_len += parameter_len;
 6076         }
 6077         if (padding_len > 0) {
 6078                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
 6079                 if (m_last == NULL) {
 6080                         /* Houston we have a problem, no space */
 6081                         sctp_m_freem(m);
 6082                         return;
 6083                 }
 6084                 chunk_len += padding_len;
 6085                 padding_len = 0;
 6086         }
 6087         /* Now we must build a cookie */
 6088         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
 6089         if (m_cookie == NULL) {
 6090                 /* memory problem */
 6091                 sctp_m_freem(m);
 6092                 return;
 6093         }
 6094         /* Now append the cookie to the end and update the space/size */
 6095         SCTP_BUF_NEXT(m_last) = m_cookie;
 6096         parameter_len = 0;
 6097         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6098                 parameter_len += SCTP_BUF_LEN(m_tmp);
 6099                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 6100                         m_last = m_tmp;
 6101                 }
 6102         }
 6103         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6104         chunk_len += parameter_len;
 6105 
 6106         /*
 6107          * Place in the size, but we don't include the last pad (if any) in
 6108          * the INIT-ACK.
 6109          */
 6110         initack->ch.chunk_length = htons(chunk_len);
 6111 
 6112         /*
 6113          * Time to sign the cookie, we don't sign over the cookie signature
 6114          * though thus we set trailer.
 6115          */
 6116         (void)sctp_hmac_m(SCTP_HMAC,
 6117             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 6118             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 6119             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
 6120         /*
 6121          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 6122          * here since the timer will drive a retranmission.
 6123          */
 6124         if (padding_len > 0) {
 6125                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 6126                         sctp_m_freem(m);
 6127                         return;
 6128                 }
 6129         }
 6130         if (stc.loopback_scope) {
 6131                 over_addr = (union sctp_sockstore *)dst;
 6132         } else {
 6133                 over_addr = NULL;
 6134         }
 6135 
 6136         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 6137             0, 0,
 6138             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
 6139             port, over_addr,
 6140             mflowtype, mflowid,
 6141             SCTP_SO_NOT_LOCKED))) {
 6142                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 6143                 if (error == ENOBUFS) {
 6144                         if (asoc != NULL) {
 6145                                 asoc->ifp_had_enobuf = 1;
 6146                         }
 6147                         SCTP_STAT_INCR(sctps_lowlevelerr);
 6148                 }
 6149         } else {
 6150                 if (asoc != NULL) {
 6151                         asoc->ifp_had_enobuf = 0;
 6152                 }
 6153         }
 6154         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 6155 }
 6156 
 6157 
 6158 static void
 6159 sctp_prune_prsctp(struct sctp_tcb *stcb,
 6160     struct sctp_association *asoc,
 6161     struct sctp_sndrcvinfo *srcv,
 6162     int dataout)
 6163 {
 6164         int freed_spc = 0;
 6165         struct sctp_tmit_chunk *chk, *nchk;
 6166 
 6167         SCTP_TCB_LOCK_ASSERT(stcb);
 6168         if ((asoc->prsctp_supported) &&
 6169             (asoc->sent_queue_cnt_removeable > 0)) {
 6170                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 6171                         /*
 6172                          * Look for chunks marked with the PR_SCTP flag AND
 6173                          * the buffer space flag. If the one being sent is
 6174                          * equal or greater priority then purge the old one
 6175                          * and free some space.
 6176                          */
 6177                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6178                                 /*
 6179                                  * This one is PR-SCTP AND buffer space
 6180                                  * limited type
 6181                                  */
 6182                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6183                                         /*
 6184                                          * Lower numbers equates to higher
 6185                                          * priority so if the one we are
 6186                                          * looking at has a larger or equal
 6187                                          * priority we want to drop the data
 6188                                          * and NOT retransmit it.
 6189                                          */
 6190                                         if (chk->data) {
 6191                                                 /*
 6192                                                  * We release the book_size
 6193                                                  * if the mbuf is here
 6194                                                  */
 6195                                                 int ret_spc;
 6196                                                 uint8_t sent;
 6197 
 6198                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 6199                                                         sent = 1;
 6200                                                 else
 6201                                                         sent = 0;
 6202                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6203                                                     sent,
 6204                                                     SCTP_SO_LOCKED);
 6205                                                 freed_spc += ret_spc;
 6206                                                 if (freed_spc >= dataout) {
 6207                                                         return;
 6208                                                 }
 6209                                         }       /* if chunk was present */
 6210                                 }       /* if of sufficient priority */
 6211                         }       /* if chunk has enabled */
 6212                 }               /* tailqforeach */
 6213 
 6214                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 6215                         /* Here we must move to the sent queue and mark */
 6216                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6217                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6218                                         if (chk->data) {
 6219                                                 /*
 6220                                                  * We release the book_size
 6221                                                  * if the mbuf is here
 6222                                                  */
 6223                                                 int ret_spc;
 6224 
 6225                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6226                                                     0, SCTP_SO_LOCKED);
 6227 
 6228                                                 freed_spc += ret_spc;
 6229                                                 if (freed_spc >= dataout) {
 6230                                                         return;
 6231                                                 }
 6232                                         }       /* end if chk->data */
 6233                                 }       /* end if right class */
 6234                         }       /* end if chk pr-sctp */
 6235                 }               /* tailqforeachsafe (chk) */
 6236         }                       /* if enabled in asoc */
 6237 }
 6238 
 6239 int
 6240 sctp_get_frag_point(struct sctp_tcb *stcb,
 6241     struct sctp_association *asoc)
 6242 {
 6243         int siz, ovh;
 6244 
 6245         /*
 6246          * For endpoints that have both v6 and v4 addresses we must reserve
 6247          * room for the ipv6 header, for those that are only dealing with V4
 6248          * we use a larger frag point.
 6249          */
 6250         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 6251                 ovh = SCTP_MIN_OVERHEAD;
 6252         } else {
 6253                 ovh = SCTP_MIN_V4_OVERHEAD;
 6254         }
 6255         ovh += SCTP_DATA_CHUNK_OVERHEAD(stcb);
 6256         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
 6257                 siz = asoc->smallest_mtu - ovh;
 6258         else
 6259                 siz = (stcb->asoc.sctp_frag_point - ovh);
 6260         /*
 6261          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
 6262          */
 6263         /* A data chunk MUST fit in a cluster */
 6264         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
 6265         /* } */
 6266 
 6267         /* adjust for an AUTH chunk if DATA requires auth */
 6268         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
 6269                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 6270 
 6271         if (siz % 4) {
 6272                 /* make it an even word boundary please */
 6273                 siz -= (siz % 4);
 6274         }
 6275         return (siz);
 6276 }
 6277 
 6278 static void
 6279 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
 6280 {
 6281         /*
 6282          * We assume that the user wants PR_SCTP_TTL if the user provides a
 6283          * positive lifetime but does not specify any PR_SCTP policy.
 6284          */
 6285         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 6286                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6287         } else if (sp->timetolive > 0) {
 6288                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
 6289                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6290         } else {
 6291                 return;
 6292         }
 6293         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 6294         case CHUNK_FLAGS_PR_SCTP_BUF:
 6295                 /*
 6296                  * Time to live is a priority stored in tv_sec when doing
 6297                  * the buffer drop thing.
 6298                  */
 6299                 sp->ts.tv_sec = sp->timetolive;
 6300                 sp->ts.tv_usec = 0;
 6301                 break;
 6302         case CHUNK_FLAGS_PR_SCTP_TTL:
 6303                 {
 6304                         struct timeval tv;
 6305 
 6306                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6307                         tv.tv_sec = sp->timetolive / 1000;
 6308                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 6309                         /*
 6310                          * TODO sctp_constants.h needs alternative time
 6311                          * macros when _KERNEL is undefined.
 6312                          */
 6313                         timevaladd(&sp->ts, &tv);
 6314                 }
 6315                 break;
 6316         case CHUNK_FLAGS_PR_SCTP_RTX:
 6317                 /*
 6318                  * Time to live is a the number or retransmissions stored in
 6319                  * tv_sec.
 6320                  */
 6321                 sp->ts.tv_sec = sp->timetolive;
 6322                 sp->ts.tv_usec = 0;
 6323                 break;
 6324         default:
 6325                 SCTPDBG(SCTP_DEBUG_USRREQ1,
 6326                     "Unknown PR_SCTP policy %u.\n",
 6327                     PR_SCTP_POLICY(sp->sinfo_flags));
 6328                 break;
 6329         }
 6330 }
 6331 
 6332 static int
 6333 sctp_msg_append(struct sctp_tcb *stcb,
 6334     struct sctp_nets *net,
 6335     struct mbuf *m,
 6336     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
 6337 {
 6338         int error = 0;
 6339         struct mbuf *at;
 6340         struct sctp_stream_queue_pending *sp = NULL;
 6341         struct sctp_stream_out *strm;
 6342 
 6343         /*
 6344          * Given an mbuf chain, put it into the association send queue and
 6345          * place it on the wheel
 6346          */
 6347         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 6348                 /* Invalid stream number */
 6349                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6350                 error = EINVAL;
 6351                 goto out_now;
 6352         }
 6353         if ((stcb->asoc.stream_locked) &&
 6354             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 6355                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6356                 error = EINVAL;
 6357                 goto out_now;
 6358         }
 6359         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 6360         /* Now can we send this? */
 6361         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
 6362             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 6363             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 6364             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 6365                 /* got data while shutting down */
 6366                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
 6367                 error = ECONNRESET;
 6368                 goto out_now;
 6369         }
 6370         sctp_alloc_a_strmoq(stcb, sp);
 6371         if (sp == NULL) {
 6372                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6373                 error = ENOMEM;
 6374                 goto out_now;
 6375         }
 6376         sp->sinfo_flags = srcv->sinfo_flags;
 6377         sp->timetolive = srcv->sinfo_timetolive;
 6378         sp->ppid = srcv->sinfo_ppid;
 6379         sp->context = srcv->sinfo_context;
 6380         sp->fsn = 0;
 6381         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 6382                 sp->net = net;
 6383                 atomic_add_int(&sp->net->ref_count, 1);
 6384         } else {
 6385                 sp->net = NULL;
 6386         }
 6387         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6388         sp->sid = srcv->sinfo_stream;
 6389         sp->msg_is_complete = 1;
 6390         sp->sender_all_done = 1;
 6391         sp->some_taken = 0;
 6392         sp->data = m;
 6393         sp->tail_mbuf = NULL;
 6394         sctp_set_prsctp_policy(sp);
 6395         /*
 6396          * We could in theory (for sendall) sifa the length in, but we would
 6397          * still have to hunt through the chain since we need to setup the
 6398          * tail_mbuf
 6399          */
 6400         sp->length = 0;
 6401         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
 6402                 if (SCTP_BUF_NEXT(at) == NULL)
 6403                         sp->tail_mbuf = at;
 6404                 sp->length += SCTP_BUF_LEN(at);
 6405         }
 6406         if (srcv->sinfo_keynumber_valid) {
 6407                 sp->auth_keyid = srcv->sinfo_keynumber;
 6408         } else {
 6409                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
 6410         }
 6411         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
 6412                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
 6413                 sp->holds_key_ref = 1;
 6414         }
 6415         if (hold_stcb_lock == 0) {
 6416                 SCTP_TCB_SEND_LOCK(stcb);
 6417         }
 6418         sctp_snd_sb_alloc(stcb, sp->length);
 6419         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 6420         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 6421         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
 6422         m = NULL;
 6423         if (hold_stcb_lock == 0) {
 6424                 SCTP_TCB_SEND_UNLOCK(stcb);
 6425         }
 6426 out_now:
 6427         if (m) {
 6428                 sctp_m_freem(m);
 6429         }
 6430         return (error);
 6431 }
 6432 
 6433 
 6434 static struct mbuf *
 6435 sctp_copy_mbufchain(struct mbuf *clonechain,
 6436     struct mbuf *outchain,
 6437     struct mbuf **endofchain,
 6438     int can_take_mbuf,
 6439     int sizeofcpy,
 6440     uint8_t copy_by_ref)
 6441 {
 6442         struct mbuf *m;
 6443         struct mbuf *appendchain;
 6444         caddr_t cp;
 6445         int len;
 6446 
 6447         if (endofchain == NULL) {
 6448                 /* error */
 6449 error_out:
 6450                 if (outchain)
 6451                         sctp_m_freem(outchain);
 6452                 return (NULL);
 6453         }
 6454         if (can_take_mbuf) {
 6455                 appendchain = clonechain;
 6456         } else {
 6457                 if (!copy_by_ref &&
 6458                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
 6459                     ) {
 6460                         /* Its not in a cluster */
 6461                         if (*endofchain == NULL) {
 6462                                 /* lets get a mbuf cluster */
 6463                                 if (outchain == NULL) {
 6464                                         /* This is the general case */
 6465                         new_mbuf:
 6466                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6467                                         if (outchain == NULL) {
 6468                                                 goto error_out;
 6469                                         }
 6470                                         SCTP_BUF_LEN(outchain) = 0;
 6471                                         *endofchain = outchain;
 6472                                         /* get the prepend space */
 6473                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 6474                                 } else {
 6475                                         /*
 6476                                          * We really should not get a NULL
 6477                                          * in endofchain
 6478                                          */
 6479                                         /* find end */
 6480                                         m = outchain;
 6481                                         while (m) {
 6482                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6483                                                         *endofchain = m;
 6484                                                         break;
 6485                                                 }
 6486                                                 m = SCTP_BUF_NEXT(m);
 6487                                         }
 6488                                         /* sanity */
 6489                                         if (*endofchain == NULL) {
 6490                                                 /*
 6491                                                  * huh, TSNH XXX maybe we
 6492                                                  * should panic
 6493                                                  */
 6494                                                 sctp_m_freem(outchain);
 6495                                                 goto new_mbuf;
 6496                                         }
 6497                                 }
 6498                                 /* get the new end of length */
 6499                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6500                         } else {
 6501                                 /* how much is left at the end? */
 6502                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6503                         }
 6504                         /* Find the end of the data, for appending */
 6505                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 6506 
 6507                         /* Now lets copy it out */
 6508                         if (len >= sizeofcpy) {
 6509                                 /* It all fits, copy it in */
 6510                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 6511                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6512                         } else {
 6513                                 /* fill up the end of the chain */
 6514                                 if (len > 0) {
 6515                                         m_copydata(clonechain, 0, len, cp);
 6516                                         SCTP_BUF_LEN((*endofchain)) += len;
 6517                                         /* now we need another one */
 6518                                         sizeofcpy -= len;
 6519                                 }
 6520                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6521                                 if (m == NULL) {
 6522                                         /* We failed */
 6523                                         goto error_out;
 6524                                 }
 6525                                 SCTP_BUF_NEXT((*endofchain)) = m;
 6526                                 *endofchain = m;
 6527                                 cp = mtod((*endofchain), caddr_t);
 6528                                 m_copydata(clonechain, len, sizeofcpy, cp);
 6529                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6530                         }
 6531                         return (outchain);
 6532                 } else {
 6533                         /* copy the old fashion way */
 6534                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
 6535 #ifdef SCTP_MBUF_LOGGING
 6536                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6537                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
 6538                         }
 6539 #endif
 6540                 }
 6541         }
 6542         if (appendchain == NULL) {
 6543                 /* error */
 6544                 if (outchain)
 6545                         sctp_m_freem(outchain);
 6546                 return (NULL);
 6547         }
 6548         if (outchain) {
 6549                 /* tack on to the end */
 6550                 if (*endofchain != NULL) {
 6551                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 6552                 } else {
 6553                         m = outchain;
 6554                         while (m) {
 6555                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6556                                         SCTP_BUF_NEXT(m) = appendchain;
 6557                                         break;
 6558                                 }
 6559                                 m = SCTP_BUF_NEXT(m);
 6560                         }
 6561                 }
 6562                 /*
 6563                  * save off the end and update the end-chain position
 6564                  */
 6565                 m = appendchain;
 6566                 while (m) {
 6567                         if (SCTP_BUF_NEXT(m) == NULL) {
 6568                                 *endofchain = m;
 6569                                 break;
 6570                         }
 6571                         m = SCTP_BUF_NEXT(m);
 6572                 }
 6573                 return (outchain);
 6574         } else {
 6575                 /* save off the end and update the end-chain position */
 6576                 m = appendchain;
 6577                 while (m) {
 6578                         if (SCTP_BUF_NEXT(m) == NULL) {
 6579                                 *endofchain = m;
 6580                                 break;
 6581                         }
 6582                         m = SCTP_BUF_NEXT(m);
 6583                 }
 6584                 return (appendchain);
 6585         }
 6586 }
 6587 
 6588 static int
 6589 sctp_med_chunk_output(struct sctp_inpcb *inp,
 6590     struct sctp_tcb *stcb,
 6591     struct sctp_association *asoc,
 6592     int *num_out,
 6593     int *reason_code,
 6594     int control_only, int from_where,
 6595     struct timeval *now, int *now_filled, int frag_point, int so_locked
 6596 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 6597     SCTP_UNUSED
 6598 #endif
 6599 );
 6600 
 6601 static void
 6602 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 6603     uint32_t val SCTP_UNUSED)
 6604 {
 6605         struct sctp_copy_all *ca;
 6606         struct mbuf *m;
 6607         int ret = 0;
 6608         int added_control = 0;
 6609         int un_sent, do_chunk_output = 1;
 6610         struct sctp_association *asoc;
 6611         struct sctp_nets *net;
 6612 
 6613         ca = (struct sctp_copy_all *)ptr;
 6614         if (ca->m == NULL) {
 6615                 return;
 6616         }
 6617         if (ca->inp != inp) {
 6618                 /* TSNH */
 6619                 return;
 6620         }
 6621         if (ca->sndlen > 0) {
 6622                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
 6623                 if (m == NULL) {
 6624                         /* can't copy so we are done */
 6625                         ca->cnt_failed++;
 6626                         return;
 6627                 }
 6628 #ifdef SCTP_MBUF_LOGGING
 6629                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6630                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
 6631                 }
 6632 #endif
 6633         } else {
 6634                 m = NULL;
 6635         }
 6636         SCTP_TCB_LOCK_ASSERT(stcb);
 6637         if (stcb->asoc.alternate) {
 6638                 net = stcb->asoc.alternate;
 6639         } else {
 6640                 net = stcb->asoc.primary_destination;
 6641         }
 6642         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 6643                 /* Abort this assoc with m as the user defined reason */
 6644                 if (m != NULL) {
 6645                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
 6646                 } else {
 6647                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 6648                             0, M_NOWAIT, 1, MT_DATA);
 6649                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
 6650                 }
 6651                 if (m != NULL) {
 6652                         struct sctp_paramhdr *ph;
 6653 
 6654                         ph = mtod(m, struct sctp_paramhdr *);
 6655                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 6656                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
 6657                 }
 6658                 /*
 6659                  * We add one here to keep the assoc from dis-appearing on
 6660                  * us.
 6661                  */
 6662                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6663                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
 6664                 /*
 6665                  * sctp_abort_an_association calls sctp_free_asoc() free
 6666                  * association will NOT free it since we incremented the
 6667                  * refcnt .. we do this to prevent it being freed and things
 6668                  * getting tricky since we could end up (from free_asoc)
 6669                  * calling inpcb_free which would get a recursive lock call
 6670                  * to the iterator lock.. But as a consequence of that the
 6671                  * stcb will return to us un-locked.. since free_asoc
 6672                  * returns with either no TCB or the TCB unlocked, we must
 6673                  * relock.. to unlock in the iterator timer :-0
 6674                  */
 6675                 SCTP_TCB_LOCK(stcb);
 6676                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6677                 goto no_chunk_output;
 6678         } else {
 6679                 if (m) {
 6680                         ret = sctp_msg_append(stcb, net, m,
 6681                             &ca->sndrcv, 1);
 6682                 }
 6683                 asoc = &stcb->asoc;
 6684                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 6685                         /* shutdown this assoc */
 6686                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6687                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6688                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
 6689                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6690                                         goto abort_anyway;
 6691                                 }
 6692                                 /*
 6693                                  * there is nothing queued to send, so I'm
 6694                                  * done...
 6695                                  */
 6696                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 6697                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6698                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6699                                         /*
 6700                                          * only send SHUTDOWN the first time
 6701                                          * through
 6702                                          */
 6703                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
 6704                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 6705                                         }
 6706                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 6707                                         sctp_stop_timers_for_shutdown(stcb);
 6708                                         sctp_send_shutdown(stcb, net);
 6709                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 6710                                             net);
 6711                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6712                                             asoc->primary_destination);
 6713                                         added_control = 1;
 6714                                         do_chunk_output = 0;
 6715                                 }
 6716                         } else {
 6717                                 /*
 6718                                  * we still got (or just got) data to send,
 6719                                  * so set SHUTDOWN_PENDING
 6720                                  */
 6721                                 /*
 6722                                  * XXX sockets draft says that SCTP_EOF
 6723                                  * should be sent with no data.  currently,
 6724                                  * we will allow user data to be sent first
 6725                                  * and move to SHUTDOWN-PENDING
 6726                                  */
 6727                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 6728                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6729                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6730                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6731                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
 6732                                         }
 6733                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
 6734                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6735                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6736                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 6737                                                 struct mbuf *op_err;
 6738                                                 char msg[SCTP_DIAG_INFO_LEN];
 6739 
 6740                                 abort_anyway:
 6741                                                 snprintf(msg, sizeof(msg),
 6742                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
 6743                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 6744                                                     msg);
 6745                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6746                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 6747                                                     op_err, SCTP_SO_NOT_LOCKED);
 6748                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6749                                                 goto no_chunk_output;
 6750                                         }
 6751                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6752                                             asoc->primary_destination);
 6753                                 }
 6754                         }
 6755 
 6756                 }
 6757         }
 6758         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 6759             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
 6760 
 6761         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 6762             (stcb->asoc.total_flight > 0) &&
 6763             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
 6764                 do_chunk_output = 0;
 6765         }
 6766         if (do_chunk_output)
 6767                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 6768         else if (added_control) {
 6769                 int num_out, reason, now_filled = 0;
 6770                 struct timeval now;
 6771                 int frag_point;
 6772 
 6773                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 6774                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 6775                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
 6776         }
 6777 no_chunk_output:
 6778         if (ret) {
 6779                 ca->cnt_failed++;
 6780         } else {
 6781                 ca->cnt_sent++;
 6782         }
 6783 }
 6784 
 6785 static void
 6786 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
 6787 {
 6788         struct sctp_copy_all *ca;
 6789 
 6790         ca = (struct sctp_copy_all *)ptr;
 6791         /*
 6792          * Do a notify here? Kacheong suggests that the notify be done at
 6793          * the send time.. so you would push up a notification if any send
 6794          * failed. Don't know if this is feasible since the only failures we
 6795          * have is "memory" related and if you cannot get an mbuf to send
 6796          * the data you surely can't get an mbuf to send up to notify the
 6797          * user you can't send the data :->
 6798          */
 6799 
 6800         /* now free everything */
 6801         sctp_m_freem(ca->m);
 6802         SCTP_FREE(ca, SCTP_M_COPYAL);
 6803 }
 6804 
 6805 static struct mbuf *
 6806 sctp_copy_out_all(struct uio *uio, int len)
 6807 {
 6808         struct mbuf *ret, *at;
 6809         int left, willcpy, cancpy, error;
 6810 
 6811         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
 6812         if (ret == NULL) {
 6813                 /* TSNH */
 6814                 return (NULL);
 6815         }
 6816         left = len;
 6817         SCTP_BUF_LEN(ret) = 0;
 6818         /* save space for the data chunk header */
 6819         cancpy = (int)M_TRAILINGSPACE(ret);
 6820         willcpy = min(cancpy, left);
 6821         at = ret;
 6822         while (left > 0) {
 6823                 /* Align data to the end */
 6824                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
 6825                 if (error) {
 6826         err_out_now:
 6827                         sctp_m_freem(at);
 6828                         return (NULL);
 6829                 }
 6830                 SCTP_BUF_LEN(at) = willcpy;
 6831                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 6832                 left -= willcpy;
 6833                 if (left > 0) {
 6834                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
 6835                         if (SCTP_BUF_NEXT(at) == NULL) {
 6836                                 goto err_out_now;
 6837                         }
 6838                         at = SCTP_BUF_NEXT(at);
 6839                         SCTP_BUF_LEN(at) = 0;
 6840                         cancpy = (int)M_TRAILINGSPACE(at);
 6841                         willcpy = min(cancpy, left);
 6842                 }
 6843         }
 6844         return (ret);
 6845 }
 6846 
 6847 static int
 6848 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 6849     struct sctp_sndrcvinfo *srcv)
 6850 {
 6851         int ret;
 6852         struct sctp_copy_all *ca;
 6853 
 6854         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 6855             SCTP_M_COPYAL);
 6856         if (ca == NULL) {
 6857                 sctp_m_freem(m);
 6858                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6859                 return (ENOMEM);
 6860         }
 6861         memset(ca, 0, sizeof(struct sctp_copy_all));
 6862 
 6863         ca->inp = inp;
 6864         if (srcv) {
 6865                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 6866         }
 6867         /*
 6868          * take off the sendall flag, it would be bad if we failed to do
 6869          * this :-0
 6870          */
 6871         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 6872         /* get length and mbuf chain */
 6873         if (uio) {
 6874                 ca->sndlen = (int)uio->uio_resid;
 6875                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 6876                 if (ca->m == NULL) {
 6877                         SCTP_FREE(ca, SCTP_M_COPYAL);
 6878                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6879                         return (ENOMEM);
 6880                 }
 6881         } else {
 6882                 /* Gather the length of the send */
 6883                 struct mbuf *mat;
 6884 
 6885                 ca->sndlen = 0;
 6886                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 6887                         ca->sndlen += SCTP_BUF_LEN(mat);
 6888                 }
 6889         }
 6890         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 6891             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 6892             SCTP_ASOC_ANY_STATE,
 6893             (void *)ca, 0,
 6894             sctp_sendall_completes, inp, 1);
 6895         if (ret) {
 6896                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
 6897                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6898                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 6899                 return (EFAULT);
 6900         }
 6901         return (0);
 6902 }
 6903 
 6904 
 6905 void
 6906 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6907 {
 6908         struct sctp_tmit_chunk *chk, *nchk;
 6909 
 6910         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 6911                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 6912                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6913                         asoc->ctrl_queue_cnt--;
 6914                         if (chk->data) {
 6915                                 sctp_m_freem(chk->data);
 6916                                 chk->data = NULL;
 6917                         }
 6918                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6919                 }
 6920         }
 6921 }
 6922 
 6923 void
 6924 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 6925 {
 6926         struct sctp_association *asoc;
 6927         struct sctp_tmit_chunk *chk, *nchk;
 6928         struct sctp_asconf_chunk *acp;
 6929 
 6930         asoc = &stcb->asoc;
 6931         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 6932                 /* find SCTP_ASCONF chunk in queue */
 6933                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 6934                         if (chk->data) {
 6935                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
 6936                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
 6937                                         /* Not Acked yet */
 6938                                         break;
 6939                                 }
 6940                         }
 6941                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
 6942                         asoc->ctrl_queue_cnt--;
 6943                         if (chk->data) {
 6944                                 sctp_m_freem(chk->data);
 6945                                 chk->data = NULL;
 6946                         }
 6947                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6948                 }
 6949         }
 6950 }
 6951 
 6952 
 6953 static void
 6954 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 6955     struct sctp_association *asoc,
 6956     struct sctp_tmit_chunk **data_list,
 6957     int bundle_at,
 6958     struct sctp_nets *net)
 6959 {
 6960         int i;
 6961         struct sctp_tmit_chunk *tp1;
 6962 
 6963         for (i = 0; i < bundle_at; i++) {
 6964                 /* off of the send queue */
 6965                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
 6966                 asoc->send_queue_cnt--;
 6967                 if (i > 0) {
 6968                         /*
 6969                          * Any chunk NOT 0 you zap the time chunk 0 gets
 6970                          * zapped or set based on if a RTO measurment is
 6971                          * needed.
 6972                          */
 6973                         data_list[i]->do_rtt = 0;
 6974                 }
 6975                 /* record time */
 6976                 data_list[i]->sent_rcv_time = net->last_sent_time;
 6977                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
 6978                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
 6979                 if (data_list[i]->whoTo == NULL) {
 6980                         data_list[i]->whoTo = net;
 6981                         atomic_add_int(&net->ref_count, 1);
 6982                 }
 6983                 /* on to the sent queue */
 6984                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 6985                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 6986                         struct sctp_tmit_chunk *tpp;
 6987 
 6988                         /* need to move back */
 6989         back_up_more:
 6990                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 6991                         if (tpp == NULL) {
 6992                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 6993                                 goto all_done;
 6994                         }
 6995                         tp1 = tpp;
 6996                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 6997                                 goto back_up_more;
 6998                         }
 6999                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 7000                 } else {
 7001                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 7002                             data_list[i],
 7003                             sctp_next);
 7004                 }
 7005 all_done:
 7006                 /* This does not lower until the cum-ack passes it */
 7007                 asoc->sent_queue_cnt++;
 7008                 if ((asoc->peers_rwnd <= 0) &&
 7009                     (asoc->total_flight == 0) &&
 7010                     (bundle_at == 1)) {
 7011                         /* Mark the chunk as being a window probe */
 7012                         SCTP_STAT_INCR(sctps_windowprobed);
 7013                 }
 7014 #ifdef SCTP_AUDITING_ENABLED
 7015                 sctp_audit_log(0xC2, 3);
 7016 #endif
 7017                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 7018                 data_list[i]->snd_count = 1;
 7019                 data_list[i]->rec.data.chunk_was_revoked = 0;
 7020                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 7021                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 7022                             data_list[i]->whoTo->flight_size,
 7023                             data_list[i]->book_size,
 7024                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 7025                             data_list[i]->rec.data.tsn);
 7026                 }
 7027                 sctp_flight_size_increase(data_list[i]);
 7028                 sctp_total_flight_increase(stcb, data_list[i]);
 7029                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 7030                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 7031                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 7032                 }
 7033                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 7034                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 7035                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 7036                         /* SWS sender side engages */
 7037                         asoc->peers_rwnd = 0;
 7038                 }
 7039         }
 7040         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
 7041                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
 7042         }
 7043 }
 7044 
 7045 static void
 7046 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
 7047 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7048     SCTP_UNUSED
 7049 #endif
 7050 )
 7051 {
 7052         struct sctp_tmit_chunk *chk, *nchk;
 7053 
 7054         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 7055                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7056                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 7057                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 7058                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 7059                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
 7060                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 7061                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 7062                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 7063                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 7064                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 7065                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 7066                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 7067                         /* Stray chunks must be cleaned up */
 7068         clean_up_anyway:
 7069                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 7070                         asoc->ctrl_queue_cnt--;
 7071                         if (chk->data) {
 7072                                 sctp_m_freem(chk->data);
 7073                                 chk->data = NULL;
 7074                         }
 7075                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 7076                                 asoc->fwd_tsn_cnt--;
 7077                         }
 7078                         sctp_free_a_chunk(stcb, chk, so_locked);
 7079                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 7080                         /* special handling, we must look into the param */
 7081                         if (chk != asoc->str_reset) {
 7082                                 goto clean_up_anyway;
 7083                         }
 7084                 }
 7085         }
 7086 }
 7087 
 7088 static uint32_t
 7089 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
 7090     uint32_t space_left, uint32_t frag_point, int eeor_on)
 7091 {
 7092         /*
 7093          * Make a decision on if I should split a msg into multiple parts.
 7094          * This is only asked of incomplete messages.
 7095          */
 7096         if (eeor_on) {
 7097                 /*
 7098                  * If we are doing EEOR we need to always send it if its the
 7099                  * entire thing, since it might be all the guy is putting in
 7100                  * the hopper.
 7101                  */
 7102                 if (space_left >= length) {
 7103                         /*-
 7104                          * If we have data outstanding,
 7105                          * we get another chance when the sack
 7106                          * arrives to transmit - wait for more data
 7107                          */
 7108                         if (stcb->asoc.total_flight == 0) {
 7109                                 /*
 7110                                  * If nothing is in flight, we zero the
 7111                                  * packet counter.
 7112                                  */
 7113                                 return (length);
 7114                         }
 7115                         return (0);
 7116 
 7117                 } else {
 7118                         /* You can fill the rest */
 7119                         return (space_left);
 7120                 }
 7121         }
 7122         /*-
 7123          * For those strange folk that make the send buffer
 7124          * smaller than our fragmentation point, we can't
 7125          * get a full msg in so we have to allow splitting.
 7126          */
 7127         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 7128                 return (length);
 7129         }
 7130         if ((length <= space_left) ||
 7131             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
 7132                 /* Sub-optimial residual don't split in non-eeor mode. */
 7133                 return (0);
 7134         }
 7135         /*
 7136          * If we reach here length is larger than the space_left. Do we wish
 7137          * to split it for the sake of packet putting together?
 7138          */
 7139         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
 7140                 /* Its ok to split it */
 7141                 return (min(space_left, frag_point));
 7142         }
 7143         /* Nope, can't split */
 7144         return (0);
 7145 }
 7146 
 7147 static uint32_t
 7148 sctp_move_to_outqueue(struct sctp_tcb *stcb,
 7149     struct sctp_stream_out *strq,
 7150     uint32_t space_left,
 7151     uint32_t frag_point,
 7152     int *giveup,
 7153     int eeor_mode,
 7154     int *bail,
 7155     int so_locked
 7156 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7157     SCTP_UNUSED
 7158 #endif
 7159 )
 7160 {
 7161         /* Move from the stream to the send_queue keeping track of the total */
 7162         struct sctp_association *asoc;
 7163         struct sctp_stream_queue_pending *sp;
 7164         struct sctp_tmit_chunk *chk;
 7165         struct sctp_data_chunk *dchkh = NULL;
 7166         struct sctp_idata_chunk *ndchkh = NULL;
 7167         uint32_t to_move, length;
 7168         int leading;
 7169         uint8_t rcv_flags = 0;
 7170         uint8_t some_taken;
 7171         uint8_t send_lock_up = 0;
 7172 
 7173         SCTP_TCB_LOCK_ASSERT(stcb);
 7174         asoc = &stcb->asoc;
 7175 one_more_time:
 7176         /* sa_ignore FREED_MEMORY */
 7177         sp = TAILQ_FIRST(&strq->outqueue);
 7178         if (sp == NULL) {
 7179                 if (send_lock_up == 0) {
 7180                         SCTP_TCB_SEND_LOCK(stcb);
 7181                         send_lock_up = 1;
 7182                 }
 7183                 sp = TAILQ_FIRST(&strq->outqueue);
 7184                 if (sp) {
 7185                         goto one_more_time;
 7186                 }
 7187                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
 7188                     (stcb->asoc.idata_supported == 0) &&
 7189                     (strq->last_msg_incomplete)) {
 7190                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 7191                             strq->sid,
 7192                             strq->last_msg_incomplete);
 7193                         strq->last_msg_incomplete = 0;
 7194                 }
 7195                 to_move = 0;
 7196                 if (send_lock_up) {
 7197                         SCTP_TCB_SEND_UNLOCK(stcb);
 7198                         send_lock_up = 0;
 7199                 }
 7200                 goto out_of;
 7201         }
 7202         if ((sp->msg_is_complete) && (sp->length == 0)) {
 7203                 if (sp->sender_all_done) {
 7204                         /*
 7205                          * We are doing deferred cleanup. Last time through
 7206                          * when we took all the data the sender_all_done was
 7207                          * not set.
 7208                          */
 7209                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
 7210                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 7211                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7212                                     sp->sender_all_done,
 7213                                     sp->length,
 7214                                     sp->msg_is_complete,
 7215                                     sp->put_last_out,
 7216                                     send_lock_up);
 7217                         }
 7218                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
 7219                                 SCTP_TCB_SEND_LOCK(stcb);
 7220                                 send_lock_up = 1;
 7221                         }
 7222                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7223                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 7224                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7225                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7226                             (strq->chunks_on_queues == 0) &&
 7227                             TAILQ_EMPTY(&strq->outqueue)) {
 7228                                 stcb->asoc.trigger_reset = 1;
 7229                         }
 7230                         if (sp->net) {
 7231                                 sctp_free_remote_addr(sp->net);
 7232                                 sp->net = NULL;
 7233                         }
 7234                         if (sp->data) {
 7235                                 sctp_m_freem(sp->data);
 7236                                 sp->data = NULL;
 7237                         }
 7238                         sctp_free_a_strmoq(stcb, sp, so_locked);
 7239                         /* we can't be locked to it */
 7240                         if (send_lock_up) {
 7241                                 SCTP_TCB_SEND_UNLOCK(stcb);
 7242                                 send_lock_up = 0;
 7243                         }
 7244                         /* back to get the next msg */
 7245                         goto one_more_time;
 7246                 } else {
 7247                         /*
 7248                          * sender just finished this but still holds a
 7249                          * reference
 7250                          */
 7251                         *giveup = 1;
 7252                         to_move = 0;
 7253                         goto out_of;
 7254                 }
 7255         } else {
 7256                 /* is there some to get */
 7257                 if (sp->length == 0) {
 7258                         /* no */
 7259                         *giveup = 1;
 7260                         to_move = 0;
 7261                         goto out_of;
 7262                 } else if (sp->discard_rest) {
 7263                         if (send_lock_up == 0) {
 7264                                 SCTP_TCB_SEND_LOCK(stcb);
 7265                                 send_lock_up = 1;
 7266                         }
 7267                         /* Whack down the size */
 7268                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
 7269                         if ((stcb->sctp_socket != NULL) &&
 7270                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 7271                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
 7272                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
 7273                         }
 7274                         if (sp->data) {
 7275                                 sctp_m_freem(sp->data);
 7276                                 sp->data = NULL;
 7277                                 sp->tail_mbuf = NULL;
 7278                         }
 7279                         sp->length = 0;
 7280                         sp->some_taken = 1;
 7281                         *giveup = 1;
 7282                         to_move = 0;
 7283                         goto out_of;
 7284                 }
 7285         }
 7286         some_taken = sp->some_taken;
 7287 re_look:
 7288         length = sp->length;
 7289         if (sp->msg_is_complete) {
 7290                 /* The message is complete */
 7291                 to_move = min(length, frag_point);
 7292                 if (to_move == length) {
 7293                         /* All of it fits in the MTU */
 7294                         if (sp->some_taken) {
 7295                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 7296                         } else {
 7297                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 7298                         }
 7299                         sp->put_last_out = 1;
 7300                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
 7301                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7302                         }
 7303                 } else {
 7304                         /* Not all of it fits, we fragment */
 7305                         if (sp->some_taken == 0) {
 7306                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7307                         }
 7308                         sp->some_taken = 1;
 7309                 }
 7310         } else {
 7311                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
 7312                 if (to_move) {
 7313                         /*-
 7314                          * We use a snapshot of length in case it
 7315                          * is expanding during the compare.
 7316                          */
 7317                         uint32_t llen;
 7318 
 7319                         llen = length;
 7320                         if (to_move >= llen) {
 7321                                 to_move = llen;
 7322                                 if (send_lock_up == 0) {
 7323                                         /*-
 7324                                          * We are taking all of an incomplete msg
 7325                                          * thus we need a send lock.
 7326                                          */
 7327                                         SCTP_TCB_SEND_LOCK(stcb);
 7328                                         send_lock_up = 1;
 7329                                         if (sp->msg_is_complete) {
 7330                                                 /*
 7331                                                  * the sender finished the
 7332                                                  * msg
 7333                                                  */
 7334                                                 goto re_look;
 7335                                         }
 7336                                 }
 7337                         }
 7338                         if (sp->some_taken == 0) {
 7339                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7340                                 sp->some_taken = 1;
 7341                         }
 7342                 } else {
 7343                         /* Nothing to take. */
 7344                         *giveup = 1;
 7345                         to_move = 0;
 7346                         goto out_of;
 7347                 }
 7348         }
 7349 
 7350         /* If we reach here, we can copy out a chunk */
 7351         sctp_alloc_a_chunk(stcb, chk);
 7352         if (chk == NULL) {
 7353                 /* No chunk memory */
 7354                 *giveup = 1;
 7355                 to_move = 0;
 7356                 goto out_of;
 7357         }
 7358         /*
 7359          * Setup for unordered if needed by looking at the user sent info
 7360          * flags.
 7361          */
 7362         if (sp->sinfo_flags & SCTP_UNORDERED) {
 7363                 rcv_flags |= SCTP_DATA_UNORDERED;
 7364         }
 7365         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 7366             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
 7367                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7368         }
 7369         /* clear out the chunk before setting up */
 7370         memset(chk, 0, sizeof(*chk));
 7371         chk->rec.data.rcv_flags = rcv_flags;
 7372 
 7373         if (to_move >= length) {
 7374                 /* we think we can steal the whole thing */
 7375                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
 7376                         SCTP_TCB_SEND_LOCK(stcb);
 7377                         send_lock_up = 1;
 7378                 }
 7379                 if (to_move < sp->length) {
 7380                         /* bail, it changed */
 7381                         goto dont_do_it;
 7382                 }
 7383                 chk->data = sp->data;
 7384                 chk->last_mbuf = sp->tail_mbuf;
 7385                 /* register the stealing */
 7386                 sp->data = sp->tail_mbuf = NULL;
 7387         } else {
 7388                 struct mbuf *m;
 7389 
 7390 dont_do_it:
 7391                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
 7392                 chk->last_mbuf = NULL;
 7393                 if (chk->data == NULL) {
 7394                         sp->some_taken = some_taken;
 7395                         sctp_free_a_chunk(stcb, chk, so_locked);
 7396                         *bail = 1;
 7397                         to_move = 0;
 7398                         goto out_of;
 7399                 }
 7400 #ifdef SCTP_MBUF_LOGGING
 7401                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7402                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
 7403                 }
 7404 #endif
 7405                 /* Pull off the data */
 7406                 m_adj(sp->data, to_move);
 7407                 /* Now lets work our way down and compact it */
 7408                 m = sp->data;
 7409                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 7410                         sp->data = SCTP_BUF_NEXT(m);
 7411                         SCTP_BUF_NEXT(m) = NULL;
 7412                         if (sp->tail_mbuf == m) {
 7413                                 /*-
 7414                                  * Freeing tail? TSNH since
 7415                                  * we supposedly were taking less
 7416                                  * than the sp->length.
 7417                                  */
 7418 #ifdef INVARIANTS
 7419                                 panic("Huh, freing tail? - TSNH");
 7420 #else
 7421                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 7422                                 sp->tail_mbuf = sp->data = NULL;
 7423                                 sp->length = 0;
 7424 #endif
 7425 
 7426                         }
 7427                         sctp_m_free(m);
 7428                         m = sp->data;
 7429                 }
 7430         }
 7431         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 7432                 chk->copy_by_ref = 1;
 7433         } else {
 7434                 chk->copy_by_ref = 0;
 7435         }
 7436         /*
 7437          * get last_mbuf and counts of mb usage This is ugly but hopefully
 7438          * its only one mbuf.
 7439          */
 7440         if (chk->last_mbuf == NULL) {
 7441                 chk->last_mbuf = chk->data;
 7442                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 7443                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 7444                 }
 7445         }
 7446 
 7447         if (to_move > length) {
 7448                 /*- This should not happen either
 7449                  * since we always lower to_move to the size
 7450                  * of sp->length if its larger.
 7451                  */
 7452 #ifdef INVARIANTS
 7453                 panic("Huh, how can to_move be larger?");
 7454 #else
 7455                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 7456                 sp->length = 0;
 7457 #endif
 7458         } else {
 7459                 atomic_subtract_int(&sp->length, to_move);
 7460         }
 7461         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7462         if (M_LEADINGSPACE(chk->data) < leading) {
 7463                 /* Not enough room for a chunk header, get some */
 7464                 struct mbuf *m;
 7465 
 7466                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
 7467                 if (m == NULL) {
 7468                         /*
 7469                          * we're in trouble here. _PREPEND below will free
 7470                          * all the data if there is no leading space, so we
 7471                          * must put the data back and restore.
 7472                          */
 7473                         if (send_lock_up == 0) {
 7474                                 SCTP_TCB_SEND_LOCK(stcb);
 7475                                 send_lock_up = 1;
 7476                         }
 7477                         if (sp->data == NULL) {
 7478                                 /* unsteal the data */
 7479                                 sp->data = chk->data;
 7480                                 sp->tail_mbuf = chk->last_mbuf;
 7481                         } else {
 7482                                 struct mbuf *m_tmp;
 7483 
 7484                                 /* reassemble the data */
 7485                                 m_tmp = sp->data;
 7486                                 sp->data = chk->data;
 7487                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 7488                         }
 7489                         sp->some_taken = some_taken;
 7490                         atomic_add_int(&sp->length, to_move);
 7491                         chk->data = NULL;
 7492                         *bail = 1;
 7493                         sctp_free_a_chunk(stcb, chk, so_locked);
 7494                         to_move = 0;
 7495                         goto out_of;
 7496                 } else {
 7497                         SCTP_BUF_LEN(m) = 0;
 7498                         SCTP_BUF_NEXT(m) = chk->data;
 7499                         chk->data = m;
 7500                         M_ALIGN(chk->data, 4);
 7501                 }
 7502         }
 7503         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
 7504         if (chk->data == NULL) {
 7505                 /* HELP, TSNH since we assured it would not above? */
 7506 #ifdef INVARIANTS
 7507                 panic("prepend failes HELP?");
 7508 #else
 7509                 SCTP_PRINTF("prepend fails HELP?\n");
 7510                 sctp_free_a_chunk(stcb, chk, so_locked);
 7511 #endif
 7512                 *bail = 1;
 7513                 to_move = 0;
 7514                 goto out_of;
 7515         }
 7516         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
 7517         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
 7518         chk->book_size_scale = 0;
 7519         chk->sent = SCTP_DATAGRAM_UNSENT;
 7520 
 7521         chk->flags = 0;
 7522         chk->asoc = &stcb->asoc;
 7523         chk->pad_inplace = 0;
 7524         chk->no_fr_allowed = 0;
 7525         if (stcb->asoc.idata_supported == 0) {
 7526                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7527                         /* Just use 0. The receiver ignores the values. */
 7528                         chk->rec.data.mid = 0;
 7529                 } else {
 7530                         chk->rec.data.mid = strq->next_mid_ordered;
 7531                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7532                                 strq->next_mid_ordered++;
 7533                         }
 7534                 }
 7535         } else {
 7536                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7537                         chk->rec.data.mid = strq->next_mid_unordered;
 7538                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7539                                 strq->next_mid_unordered++;
 7540                         }
 7541                 } else {
 7542                         chk->rec.data.mid = strq->next_mid_ordered;
 7543                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7544                                 strq->next_mid_ordered++;
 7545                         }
 7546                 }
 7547         }
 7548         chk->rec.data.sid = sp->sid;
 7549         chk->rec.data.ppid = sp->ppid;
 7550         chk->rec.data.context = sp->context;
 7551         chk->rec.data.doing_fast_retransmit = 0;
 7552 
 7553         chk->rec.data.timetodrop = sp->ts;
 7554         chk->flags = sp->act_flags;
 7555 
 7556         if (sp->net) {
 7557                 chk->whoTo = sp->net;
 7558                 atomic_add_int(&chk->whoTo->ref_count, 1);
 7559         } else
 7560                 chk->whoTo = NULL;
 7561 
 7562         if (sp->holds_key_ref) {
 7563                 chk->auth_keyid = sp->auth_keyid;
 7564                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
 7565                 chk->holds_key_ref = 1;
 7566         }
 7567         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
 7568         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
 7569                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 7570                     (uint32_t)(uintptr_t)stcb, sp->length,
 7571                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
 7572                     chk->rec.data.tsn);
 7573         }
 7574         if (stcb->asoc.idata_supported == 0) {
 7575                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
 7576         } else {
 7577                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
 7578         }
 7579         /*
 7580          * Put the rest of the things in place now. Size was done earlier in
 7581          * previous loop prior to padding.
 7582          */
 7583 
 7584 #ifdef SCTP_ASOCLOG_OF_TSNS
 7585         SCTP_TCB_LOCK_ASSERT(stcb);
 7586         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 7587                 asoc->tsn_out_at = 0;
 7588                 asoc->tsn_out_wrapped = 1;
 7589         }
 7590         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
 7591         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
 7592         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
 7593         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 7594         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 7595         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 7596         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 7597         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 7598         asoc->tsn_out_at++;
 7599 #endif
 7600         if (stcb->asoc.idata_supported == 0) {
 7601                 dchkh->ch.chunk_type = SCTP_DATA;
 7602                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7603                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7604                 dchkh->dp.sid = htons(strq->sid);
 7605                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
 7606                 dchkh->dp.ppid = chk->rec.data.ppid;
 7607                 dchkh->ch.chunk_length = htons(chk->send_size);
 7608         } else {
 7609                 ndchkh->ch.chunk_type = SCTP_IDATA;
 7610                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7611                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7612                 ndchkh->dp.sid = htons(strq->sid);
 7613                 ndchkh->dp.reserved = htons(0);
 7614                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
 7615                 if (sp->fsn == 0)
 7616                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
 7617                 else
 7618                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
 7619                 sp->fsn++;
 7620                 ndchkh->ch.chunk_length = htons(chk->send_size);
 7621         }
 7622         /* Now advance the chk->send_size by the actual pad needed. */
 7623         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 7624                 /* need a pad */
 7625                 struct mbuf *lm;
 7626                 int pads;
 7627 
 7628                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 7629                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
 7630                 if (lm != NULL) {
 7631                         chk->last_mbuf = lm;
 7632                         chk->pad_inplace = 1;
 7633                 }
 7634                 chk->send_size += pads;
 7635         }
 7636         if (PR_SCTP_ENABLED(chk->flags)) {
 7637                 asoc->pr_sctp_cnt++;
 7638         }
 7639         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 7640                 /* All done pull and kill the message */
 7641                 if (sp->put_last_out == 0) {
 7642                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 7643                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7644                             sp->sender_all_done,
 7645                             sp->length,
 7646                             sp->msg_is_complete,
 7647                             sp->put_last_out,
 7648                             send_lock_up);
 7649                 }
 7650                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
 7651                         SCTP_TCB_SEND_LOCK(stcb);
 7652                         send_lock_up = 1;
 7653                 }
 7654                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7655                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 7656                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7657                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7658                     (strq->chunks_on_queues == 0) &&
 7659                     TAILQ_EMPTY(&strq->outqueue)) {
 7660                         stcb->asoc.trigger_reset = 1;
 7661                 }
 7662                 if (sp->net) {
 7663                         sctp_free_remote_addr(sp->net);
 7664                         sp->net = NULL;
 7665                 }
 7666                 if (sp->data) {
 7667                         sctp_m_freem(sp->data);
 7668                         sp->data = NULL;
 7669                 }
 7670                 sctp_free_a_strmoq(stcb, sp, so_locked);
 7671         }
 7672         asoc->chunks_on_out_queue++;
 7673         strq->chunks_on_queues++;
 7674         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 7675         asoc->send_queue_cnt++;
 7676 out_of:
 7677         if (send_lock_up) {
 7678                 SCTP_TCB_SEND_UNLOCK(stcb);
 7679         }
 7680         return (to_move);
 7681 }
 7682 
 7683 
 7684 static void
 7685 sctp_fill_outqueue(struct sctp_tcb *stcb,
 7686     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
 7687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7688     SCTP_UNUSED
 7689 #endif
 7690 )
 7691 {
 7692         struct sctp_association *asoc;
 7693         struct sctp_stream_out *strq;
 7694         uint32_t space_left, moved, total_moved;
 7695         int bail, giveup;
 7696 
 7697         SCTP_TCB_LOCK_ASSERT(stcb);
 7698         asoc = &stcb->asoc;
 7699         total_moved = 0;
 7700         switch (net->ro._l_addr.sa.sa_family) {
 7701 #ifdef INET
 7702         case AF_INET:
 7703                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
 7704                 break;
 7705 #endif
 7706 #ifdef INET6
 7707         case AF_INET6:
 7708                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
 7709                 break;
 7710 #endif
 7711         default:
 7712                 /* TSNH */
 7713                 space_left = net->mtu;
 7714                 break;
 7715         }
 7716         /* Need an allowance for the data chunk header too */
 7717         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7718 
 7719         /* must make even word boundary */
 7720         space_left &= 0xfffffffc;
 7721         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7722         giveup = 0;
 7723         bail = 0;
 7724         while ((space_left > 0) && (strq != NULL)) {
 7725                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
 7726                     &giveup, eeor_mode, &bail, so_locked);
 7727                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
 7728                 if ((giveup != 0) || (bail != 0)) {
 7729                         break;
 7730                 }
 7731                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7732                 total_moved += moved;
 7733                 space_left -= moved;
 7734                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
 7735                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7736                 } else {
 7737                         space_left = 0;
 7738                 }
 7739                 space_left &= 0xfffffffc;
 7740         }
 7741         if (bail != 0)
 7742                 *quit_now = 1;
 7743 
 7744         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
 7745 
 7746         if (total_moved == 0) {
 7747                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
 7748                     (net == stcb->asoc.primary_destination)) {
 7749                         /* ran dry for primary network net */
 7750                         SCTP_STAT_INCR(sctps_primary_randry);
 7751                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
 7752                         /* ran dry with CMT on */
 7753                         SCTP_STAT_INCR(sctps_cmt_randry);
 7754                 }
 7755         }
 7756 }
 7757 
 7758 void
 7759 sctp_fix_ecn_echo(struct sctp_association *asoc)
 7760 {
 7761         struct sctp_tmit_chunk *chk;
 7762 
 7763         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7764                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 7765                         chk->sent = SCTP_DATAGRAM_UNSENT;
 7766                 }
 7767         }
 7768 }
 7769 
 7770 void
 7771 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
 7772 {
 7773         struct sctp_association *asoc;
 7774         struct sctp_tmit_chunk *chk;
 7775         struct sctp_stream_queue_pending *sp;
 7776         unsigned int i;
 7777 
 7778         if (net == NULL) {
 7779                 return;
 7780         }
 7781         asoc = &stcb->asoc;
 7782         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 7783                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 7784                         if (sp->net == net) {
 7785                                 sctp_free_remote_addr(sp->net);
 7786                                 sp->net = NULL;
 7787                         }
 7788                 }
 7789         }
 7790         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7791                 if (chk->whoTo == net) {
 7792                         sctp_free_remote_addr(chk->whoTo);
 7793                         chk->whoTo = NULL;
 7794                 }
 7795         }
 7796 }
 7797 
 7798 int
 7799 sctp_med_chunk_output(struct sctp_inpcb *inp,
 7800     struct sctp_tcb *stcb,
 7801     struct sctp_association *asoc,
 7802     int *num_out,
 7803     int *reason_code,
 7804     int control_only, int from_where,
 7805     struct timeval *now, int *now_filled, int frag_point, int so_locked
 7806 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7807     SCTP_UNUSED
 7808 #endif
 7809 )
 7810 {
 7811         /**
 7812          * Ok this is the generic chunk service queue. we must do the
 7813          * following:
 7814          * - Service the stream queue that is next, moving any
 7815          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
 7816          *   LAST to the out queue in one pass) and assigning TSN's. This
 7817          *   only applys though if the peer does not support NDATA. For NDATA
 7818          *   chunks its ok to not send the entire message ;-)
 7819          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
 7820          *   fomulate and send the low level chunks. Making sure to combine
 7821          *   any control in the control chunk queue also.
 7822          */
 7823         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
 7824         struct mbuf *outchain, *endoutchain;
 7825         struct sctp_tmit_chunk *chk, *nchk;
 7826 
 7827         /* temp arrays for unlinking */
 7828         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 7829         int no_fragmentflg, error;
 7830         unsigned int max_rwnd_per_dest, max_send_per_dest;
 7831         int one_chunk, hbflag, skip_data_for_this_net;
 7832         int asconf, cookie, no_out_cnt;
 7833         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
 7834         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 7835         int tsns_sent = 0;
 7836         uint32_t auth_offset = 0;
 7837         struct sctp_auth_chunk *auth = NULL;
 7838         uint16_t auth_keyid;
 7839         int override_ok = 1;
 7840         int skip_fill_up = 0;
 7841         int data_auth_reqd = 0;
 7842 
 7843         /*
 7844          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 7845          * destination.
 7846          */
 7847         int quit_now = 0;
 7848 
 7849         *num_out = 0;
 7850         *reason_code = 0;
 7851         auth_keyid = stcb->asoc.authinfo.active_keyid;
 7852         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 7853             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 7854             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 7855                 eeor_mode = 1;
 7856         } else {
 7857                 eeor_mode = 0;
 7858         }
 7859         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 7860         /*
 7861          * First lets prime the pump. For each destination, if there is room
 7862          * in the flight size, attempt to pull an MTU's worth out of the
 7863          * stream queues into the general send_queue
 7864          */
 7865 #ifdef SCTP_AUDITING_ENABLED
 7866         sctp_audit_log(0xC2, 2);
 7867 #endif
 7868         SCTP_TCB_LOCK_ASSERT(stcb);
 7869         hbflag = 0;
 7870         if (control_only)
 7871                 no_data_chunks = 1;
 7872         else
 7873                 no_data_chunks = 0;
 7874 
 7875         /* Nothing to possible to send? */
 7876         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
 7877             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
 7878             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7879             TAILQ_EMPTY(&asoc->send_queue) &&
 7880             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
 7881 nothing_to_send:
 7882                 *reason_code = 9;
 7883                 return (0);
 7884         }
 7885         if (asoc->peers_rwnd == 0) {
 7886                 /* No room in peers rwnd */
 7887                 *reason_code = 1;
 7888                 if (asoc->total_flight > 0) {
 7889                         /* we are allowed one chunk in flight */
 7890                         no_data_chunks = 1;
 7891                 }
 7892         }
 7893         if (stcb->asoc.ecn_echo_cnt_onq) {
 7894                 /* Record where a sack goes, if any */
 7895                 if (no_data_chunks &&
 7896                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
 7897                         /* Nothing but ECNe to send - we don't do that */
 7898                         goto nothing_to_send;
 7899                 }
 7900                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7901                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7902                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 7903                                 sack_goes_to = chk->whoTo;
 7904                                 break;
 7905                         }
 7906                 }
 7907         }
 7908         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
 7909         if (stcb->sctp_socket)
 7910                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
 7911         else
 7912                 max_send_per_dest = 0;
 7913         if (no_data_chunks == 0) {
 7914                 /* How many non-directed chunks are there? */
 7915                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7916                         if (chk->whoTo == NULL) {
 7917                                 /*
 7918                                  * We already have non-directed chunks on
 7919                                  * the queue, no need to do a fill-up.
 7920                                  */
 7921                                 skip_fill_up = 1;
 7922                                 break;
 7923                         }
 7924                 }
 7925 
 7926         }
 7927         if ((no_data_chunks == 0) &&
 7928             (skip_fill_up == 0) &&
 7929             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
 7930                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 7931                         /*
 7932                          * This for loop we are in takes in each net, if
 7933                          * its's got space in cwnd and has data sent to it
 7934                          * (when CMT is off) then it calls
 7935                          * sctp_fill_outqueue for the net. This gets data on
 7936                          * the send queue for that network.
 7937                          *
 7938                          * In sctp_fill_outqueue TSN's are assigned and data
 7939                          * is copied out of the stream buffers. Note mostly
 7940                          * copy by reference (we hope).
 7941                          */
 7942                         net->window_probe = 0;
 7943                         if ((net != stcb->asoc.alternate) &&
 7944                             ((net->dest_state & SCTP_ADDR_PF) ||
 7945                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 7946                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 7947                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7948                                         sctp_log_cwnd(stcb, net, 1,
 7949                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7950                                 }
 7951                                 continue;
 7952                         }
 7953                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 7954                             (net->flight_size == 0)) {
 7955                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 7956                         }
 7957                         if (net->flight_size >= net->cwnd) {
 7958                                 /* skip this network, no room - can't fill */
 7959                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7960                                         sctp_log_cwnd(stcb, net, 3,
 7961                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7962                                 }
 7963                                 continue;
 7964                         }
 7965                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7966                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7967                         }
 7968                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
 7969                         if (quit_now) {
 7970                                 /* memory alloc failure */
 7971                                 no_data_chunks = 1;
 7972                                 break;
 7973                         }
 7974                 }
 7975         }
 7976         /* now service each destination and send out what we can for it */
 7977         /* Nothing to send? */
 7978         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 7979             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7980             TAILQ_EMPTY(&asoc->send_queue)) {
 7981                 *reason_code = 8;
 7982                 return (0);
 7983         }
 7984 
 7985         if (asoc->sctp_cmt_on_off > 0) {
 7986                 /* get the last start point */
 7987                 start_at = asoc->last_net_cmt_send_started;
 7988                 if (start_at == NULL) {
 7989                         /* null so to beginning */
 7990                         start_at = TAILQ_FIRST(&asoc->nets);
 7991                 } else {
 7992                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
 7993                         if (start_at == NULL) {
 7994                                 start_at = TAILQ_FIRST(&asoc->nets);
 7995                         }
 7996                 }
 7997                 asoc->last_net_cmt_send_started = start_at;
 7998         } else {
 7999                 start_at = TAILQ_FIRST(&asoc->nets);
 8000         }
 8001         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 8002                 if (chk->whoTo == NULL) {
 8003                         if (asoc->alternate) {
 8004                                 chk->whoTo = asoc->alternate;
 8005                         } else {
 8006                                 chk->whoTo = asoc->primary_destination;
 8007                         }
 8008                         atomic_add_int(&chk->whoTo->ref_count, 1);
 8009                 }
 8010         }
 8011         old_start_at = NULL;
 8012 again_one_more_time:
 8013         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 8014                 /* how much can we send? */
 8015                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 8016                 if (old_start_at && (old_start_at == net)) {
 8017                         /* through list ocmpletely. */
 8018                         break;
 8019                 }
 8020                 tsns_sent = 0xa;
 8021                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 8022                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 8023                     (net->flight_size >= net->cwnd)) {
 8024                         /*
 8025                          * Nothing on control or asconf and flight is full,
 8026                          * we can skip even in the CMT case.
 8027                          */
 8028                         continue;
 8029                 }
 8030                 bundle_at = 0;
 8031                 endoutchain = outchain = NULL;
 8032                 no_fragmentflg = 1;
 8033                 one_chunk = 0;
 8034                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 8035                         skip_data_for_this_net = 1;
 8036                 } else {
 8037                         skip_data_for_this_net = 0;
 8038                 }
 8039                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8040 #ifdef INET
 8041                 case AF_INET:
 8042                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8043                         break;
 8044 #endif
 8045 #ifdef INET6
 8046                 case AF_INET6:
 8047                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8048                         break;
 8049 #endif
 8050                 default:
 8051                         /* TSNH */
 8052                         mtu = net->mtu;
 8053                         break;
 8054                 }
 8055                 mx_mtu = mtu;
 8056                 to_out = 0;
 8057                 if (mtu > asoc->peers_rwnd) {
 8058                         if (asoc->total_flight > 0) {
 8059                                 /* We have a packet in flight somewhere */
 8060                                 r_mtu = asoc->peers_rwnd;
 8061                         } else {
 8062                                 /* We are always allowed to send one MTU out */
 8063                                 one_chunk = 1;
 8064                                 r_mtu = mtu;
 8065                         }
 8066                 } else {
 8067                         r_mtu = mtu;
 8068                 }
 8069                 error = 0;
 8070                 /************************/
 8071                 /* ASCONF transmission */
 8072                 /************************/
 8073                 /* Now first lets go through the asconf queue */
 8074                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 8075                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
 8076                                 continue;
 8077                         }
 8078                         if (chk->whoTo == NULL) {
 8079                                 if (asoc->alternate == NULL) {
 8080                                         if (asoc->primary_destination != net) {
 8081                                                 break;
 8082                                         }
 8083                                 } else {
 8084                                         if (asoc->alternate != net) {
 8085                                                 break;
 8086                                         }
 8087                                 }
 8088                         } else {
 8089                                 if (chk->whoTo != net) {
 8090                                         break;
 8091                                 }
 8092                         }
 8093                         if (chk->data == NULL) {
 8094                                 break;
 8095                         }
 8096                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
 8097                             chk->sent != SCTP_DATAGRAM_RESEND) {
 8098                                 break;
 8099                         }
 8100                         /*
 8101                          * if no AUTH is yet included and this chunk
 8102                          * requires it, make sure to account for it.  We
 8103                          * don't apply the size until the AUTH chunk is
 8104                          * actually added below in case there is no room for
 8105                          * this chunk. NOTE: we overload the use of "omtu"
 8106                          * here
 8107                          */
 8108                         if ((auth == NULL) &&
 8109                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8110                             stcb->asoc.peer_auth_chunks)) {
 8111                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8112                         } else
 8113                                 omtu = 0;
 8114                         /* Here we do NOT factor the r_mtu */
 8115                         if ((chk->send_size < (int)(mtu - omtu)) ||
 8116                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8117                                 /*
 8118                                  * We probably should glom the mbuf chain
 8119                                  * from the chk->data for control but the
 8120                                  * problem is it becomes yet one more level
 8121                                  * of tracking to do if for some reason
 8122                                  * output fails. Then I have got to
 8123                                  * reconstruct the merged control chain.. el
 8124                                  * yucko.. for now we take the easy way and
 8125                                  * do the copy
 8126                                  */
 8127                                 /*
 8128                                  * Add an AUTH chunk, if chunk requires it
 8129                                  * save the offset into the chain for AUTH
 8130                                  */
 8131                                 if ((auth == NULL) &&
 8132                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8133                                     stcb->asoc.peer_auth_chunks))) {
 8134                                         outchain = sctp_add_auth_chunk(outchain,
 8135                                             &endoutchain,
 8136                                             &auth,
 8137                                             &auth_offset,
 8138                                             stcb,
 8139                                             chk->rec.chunk_id.id);
 8140                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8141                                 }
 8142                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8143                                     (int)chk->rec.chunk_id.can_take_data,
 8144                                     chk->send_size, chk->copy_by_ref);
 8145                                 if (outchain == NULL) {
 8146                                         *reason_code = 8;
 8147                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8148                                         return (ENOMEM);
 8149                                 }
 8150                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8151                                 /* update our MTU size */
 8152                                 if (mtu > (chk->send_size + omtu))
 8153                                         mtu -= (chk->send_size + omtu);
 8154                                 else
 8155                                         mtu = 0;
 8156                                 to_out += (chk->send_size + omtu);
 8157                                 /* Do clear IP_DF ? */
 8158                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8159                                         no_fragmentflg = 0;
 8160                                 }
 8161                                 if (chk->rec.chunk_id.can_take_data)
 8162                                         chk->data = NULL;
 8163                                 /*
 8164                                  * set hb flag since we can use these for
 8165                                  * RTO
 8166                                  */
 8167                                 hbflag = 1;
 8168                                 asconf = 1;
 8169                                 /*
 8170                                  * should sysctl this: don't bundle data
 8171                                  * with ASCONF since it requires AUTH
 8172                                  */
 8173                                 no_data_chunks = 1;
 8174                                 chk->sent = SCTP_DATAGRAM_SENT;
 8175                                 if (chk->whoTo == NULL) {
 8176                                         chk->whoTo = net;
 8177                                         atomic_add_int(&net->ref_count, 1);
 8178                                 }
 8179                                 chk->snd_count++;
 8180                                 if (mtu == 0) {
 8181                                         /*
 8182                                          * Ok we are out of room but we can
 8183                                          * output without effecting the
 8184                                          * flight size since this little guy
 8185                                          * is a control only packet.
 8186                                          */
 8187                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8188                                         /*
 8189                                          * do NOT clear the asconf flag as
 8190                                          * it is used to do appropriate
 8191                                          * source address selection.
 8192                                          */
 8193                                         if (*now_filled == 0) {
 8194                                                 (void)SCTP_GETTIME_TIMEVAL(now);
 8195                                                 *now_filled = 1;
 8196                                         }
 8197                                         net->last_sent_time = *now;
 8198                                         hbflag = 0;
 8199                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8200                                             (struct sockaddr *)&net->ro._l_addr,
 8201                                             outchain, auth_offset, auth,
 8202                                             stcb->asoc.authinfo.active_keyid,
 8203                                             no_fragmentflg, 0, asconf,
 8204                                             inp->sctp_lport, stcb->rport,
 8205                                             htonl(stcb->asoc.peer_vtag),
 8206                                             net->port, NULL,
 8207                                             0, 0,
 8208                                             so_locked))) {
 8209                                                 /*
 8210                                                  * error, we could not
 8211                                                  * output
 8212                                                  */
 8213                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8214                                                 if (from_where == 0) {
 8215                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8216                                                 }
 8217                                                 if (error == ENOBUFS) {
 8218                                                         asoc->ifp_had_enobuf = 1;
 8219                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8220                                                 }
 8221                                                 /* error, could not output */
 8222                                                 if (error == EHOSTUNREACH) {
 8223                                                         /*
 8224                                                          * Destination went
 8225                                                          * unreachable
 8226                                                          * during this send
 8227                                                          */
 8228                                                         sctp_move_chunks_from_net(stcb, net);
 8229                                                 }
 8230                                                 *reason_code = 7;
 8231                                                 break;
 8232                                         } else {
 8233                                                 asoc->ifp_had_enobuf = 0;
 8234                                         }
 8235                                         /*
 8236                                          * increase the number we sent, if a
 8237                                          * cookie is sent we don't tell them
 8238                                          * any was sent out.
 8239                                          */
 8240                                         outchain = endoutchain = NULL;
 8241                                         auth = NULL;
 8242                                         auth_offset = 0;
 8243                                         if (!no_out_cnt)
 8244                                                 *num_out += ctl_cnt;
 8245                                         /* recalc a clean slate and setup */
 8246                                         switch (net->ro._l_addr.sa.sa_family) {
 8247 #ifdef INET
 8248                                         case AF_INET:
 8249                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8250                                                 break;
 8251 #endif
 8252 #ifdef INET6
 8253                                         case AF_INET6:
 8254                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8255                                                 break;
 8256 #endif
 8257                                         default:
 8258                                                 /* TSNH */
 8259                                                 mtu = net->mtu;
 8260                                                 break;
 8261                                         }
 8262                                         to_out = 0;
 8263                                         no_fragmentflg = 1;
 8264                                 }
 8265                         }
 8266                 }
 8267                 if (error != 0) {
 8268                         /* try next net */
 8269                         continue;
 8270                 }
 8271                 /************************/
 8272                 /* Control transmission */
 8273                 /************************/
 8274                 /* Now first lets go through the control queue */
 8275                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 8276                         if ((sack_goes_to) &&
 8277                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
 8278                             (chk->whoTo != sack_goes_to)) {
 8279                                 /*
 8280                                  * if we have a sack in queue, and we are
 8281                                  * looking at an ecn echo that is NOT queued
 8282                                  * to where the sack is going..
 8283                                  */
 8284                                 if (chk->whoTo == net) {
 8285                                         /*
 8286                                          * Don't transmit it to where its
 8287                                          * going (current net)
 8288                                          */
 8289                                         continue;
 8290                                 } else if (sack_goes_to == net) {
 8291                                         /*
 8292                                          * But do transmit it to this
 8293                                          * address
 8294                                          */
 8295                                         goto skip_net_check;
 8296                                 }
 8297                         }
 8298                         if (chk->whoTo == NULL) {
 8299                                 if (asoc->alternate == NULL) {
 8300                                         if (asoc->primary_destination != net) {
 8301                                                 continue;
 8302                                         }
 8303                                 } else {
 8304                                         if (asoc->alternate != net) {
 8305                                                 continue;
 8306                                         }
 8307                                 }
 8308                         } else {
 8309                                 if (chk->whoTo != net) {
 8310                                         continue;
 8311                                 }
 8312                         }
 8313         skip_net_check:
 8314                         if (chk->data == NULL) {
 8315                                 continue;
 8316                         }
 8317                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 8318                                 /*
 8319                                  * It must be unsent. Cookies and ASCONF's
 8320                                  * hang around but there timers will force
 8321                                  * when marked for resend.
 8322                                  */
 8323                                 continue;
 8324                         }
 8325                         /*
 8326                          * if no AUTH is yet included and this chunk
 8327                          * requires it, make sure to account for it.  We
 8328                          * don't apply the size until the AUTH chunk is
 8329                          * actually added below in case there is no room for
 8330                          * this chunk. NOTE: we overload the use of "omtu"
 8331                          * here
 8332                          */
 8333                         if ((auth == NULL) &&
 8334                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8335                             stcb->asoc.peer_auth_chunks)) {
 8336                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8337                         } else
 8338                                 omtu = 0;
 8339                         /* Here we do NOT factor the r_mtu */
 8340                         if ((chk->send_size <= (int)(mtu - omtu)) ||
 8341                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8342                                 /*
 8343                                  * We probably should glom the mbuf chain
 8344                                  * from the chk->data for control but the
 8345                                  * problem is it becomes yet one more level
 8346                                  * of tracking to do if for some reason
 8347                                  * output fails. Then I have got to
 8348                                  * reconstruct the merged control chain.. el
 8349                                  * yucko.. for now we take the easy way and
 8350                                  * do the copy
 8351                                  */
 8352                                 /*
 8353                                  * Add an AUTH chunk, if chunk requires it
 8354                                  * save the offset into the chain for AUTH
 8355                                  */
 8356                                 if ((auth == NULL) &&
 8357                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8358                                     stcb->asoc.peer_auth_chunks))) {
 8359                                         outchain = sctp_add_auth_chunk(outchain,
 8360                                             &endoutchain,
 8361                                             &auth,
 8362                                             &auth_offset,
 8363                                             stcb,
 8364                                             chk->rec.chunk_id.id);
 8365                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8366                                 }
 8367                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8368                                     (int)chk->rec.chunk_id.can_take_data,
 8369                                     chk->send_size, chk->copy_by_ref);
 8370                                 if (outchain == NULL) {
 8371                                         *reason_code = 8;
 8372                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8373                                         return (ENOMEM);
 8374                                 }
 8375                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8376                                 /* update our MTU size */
 8377                                 if (mtu > (chk->send_size + omtu))
 8378                                         mtu -= (chk->send_size + omtu);
 8379                                 else
 8380                                         mtu = 0;
 8381                                 to_out += (chk->send_size + omtu);
 8382                                 /* Do clear IP_DF ? */
 8383                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8384                                         no_fragmentflg = 0;
 8385                                 }
 8386                                 if (chk->rec.chunk_id.can_take_data)
 8387                                         chk->data = NULL;
 8388                                 /* Mark things to be removed, if needed */
 8389                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8390                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 8391                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 8392                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 8393                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 8394                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 8395                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 8396                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 8397                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 8398                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 8399                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 8400                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 8401                                                 hbflag = 1;
 8402                                         }
 8403                                         /* remove these chunks at the end */
 8404                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8405                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 8406                                                 /* turn off the timer */
 8407                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 8408                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 8409                                                             inp, stcb, net,
 8410                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 8411                                                 }
 8412                                         }
 8413                                         ctl_cnt++;
 8414                                 } else {
 8415                                         /*
 8416                                          * Other chunks, since they have
 8417                                          * timers running (i.e. COOKIE) we
 8418                                          * just "trust" that it gets sent or
 8419                                          * retransmitted.
 8420                                          */
 8421                                         ctl_cnt++;
 8422                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8423                                                 cookie = 1;
 8424                                                 no_out_cnt = 1;
 8425                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 8426                                                 /*
 8427                                                  * Increment ecne send count
 8428                                                  * here this means we may be
 8429                                                  * over-zealous in our
 8430                                                  * counting if the send
 8431                                                  * fails, but its the best
 8432                                                  * place to do it (we used
 8433                                                  * to do it in the queue of
 8434                                                  * the chunk, but that did
 8435                                                  * not tell how many times
 8436                                                  * it was sent.
 8437                                                  */
 8438                                                 SCTP_STAT_INCR(sctps_sendecne);
 8439                                         }
 8440                                         chk->sent = SCTP_DATAGRAM_SENT;
 8441                                         if (chk->whoTo == NULL) {
 8442                                                 chk->whoTo = net;
 8443                                                 atomic_add_int(&net->ref_count, 1);
 8444                                         }
 8445                                         chk->snd_count++;
 8446                                 }
 8447                                 if (mtu == 0) {
 8448                                         /*
 8449                                          * Ok we are out of room but we can
 8450                                          * output without effecting the
 8451                                          * flight size since this little guy
 8452                                          * is a control only packet.
 8453                                          */
 8454                                         if (asconf) {
 8455                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8456                                                 /*
 8457                                                  * do NOT clear the asconf
 8458                                                  * flag as it is used to do
 8459                                                  * appropriate source
 8460                                                  * address selection.
 8461                                                  */
 8462                                         }
 8463                                         if (cookie) {
 8464                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8465                                                 cookie = 0;
 8466                                         }
 8467                                         /* Only HB or ASCONF advances time */
 8468                                         if (hbflag) {
 8469                                                 if (*now_filled == 0) {
 8470                                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8471                                                         *now_filled = 1;
 8472                                                 }
 8473                                                 net->last_sent_time = *now;
 8474                                                 hbflag = 0;
 8475                                         }
 8476                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8477                                             (struct sockaddr *)&net->ro._l_addr,
 8478                                             outchain,
 8479                                             auth_offset, auth,
 8480                                             stcb->asoc.authinfo.active_keyid,
 8481                                             no_fragmentflg, 0, asconf,
 8482                                             inp->sctp_lport, stcb->rport,
 8483                                             htonl(stcb->asoc.peer_vtag),
 8484                                             net->port, NULL,
 8485                                             0, 0,
 8486                                             so_locked))) {
 8487                                                 /*
 8488                                                  * error, we could not
 8489                                                  * output
 8490                                                  */
 8491                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8492                                                 if (from_where == 0) {
 8493                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8494                                                 }
 8495                                                 if (error == ENOBUFS) {
 8496                                                         asoc->ifp_had_enobuf = 1;
 8497                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8498                                                 }
 8499                                                 if (error == EHOSTUNREACH) {
 8500                                                         /*
 8501                                                          * Destination went
 8502                                                          * unreachable
 8503                                                          * during this send
 8504                                                          */
 8505                                                         sctp_move_chunks_from_net(stcb, net);
 8506                                                 }
 8507                                                 *reason_code = 7;
 8508                                                 break;
 8509                                         } else {
 8510                                                 asoc->ifp_had_enobuf = 0;
 8511                                         }
 8512                                         /*
 8513                                          * increase the number we sent, if a
 8514                                          * cookie is sent we don't tell them
 8515                                          * any was sent out.
 8516                                          */
 8517                                         outchain = endoutchain = NULL;
 8518                                         auth = NULL;
 8519                                         auth_offset = 0;
 8520                                         if (!no_out_cnt)
 8521                                                 *num_out += ctl_cnt;
 8522                                         /* recalc a clean slate and setup */
 8523                                         switch (net->ro._l_addr.sa.sa_family) {
 8524 #ifdef INET
 8525                                         case AF_INET:
 8526                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8527                                                 break;
 8528 #endif
 8529 #ifdef INET6
 8530                                         case AF_INET6:
 8531                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8532                                                 break;
 8533 #endif
 8534                                         default:
 8535                                                 /* TSNH */
 8536                                                 mtu = net->mtu;
 8537                                                 break;
 8538                                         }
 8539                                         to_out = 0;
 8540                                         no_fragmentflg = 1;
 8541                                 }
 8542                         }
 8543                 }
 8544                 if (error != 0) {
 8545                         /* try next net */
 8546                         continue;
 8547                 }
 8548                 /* JRI: if dest is in PF state, do not send data to it */
 8549                 if ((asoc->sctp_cmt_on_off > 0) &&
 8550                     (net != stcb->asoc.alternate) &&
 8551                     (net->dest_state & SCTP_ADDR_PF)) {
 8552                         goto no_data_fill;
 8553                 }
 8554                 if (net->flight_size >= net->cwnd) {
 8555                         goto no_data_fill;
 8556                 }
 8557                 if ((asoc->sctp_cmt_on_off > 0) &&
 8558                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
 8559                     (net->flight_size > max_rwnd_per_dest)) {
 8560                         goto no_data_fill;
 8561                 }
 8562                 /*
 8563                  * We need a specific accounting for the usage of the send
 8564                  * buffer. We also need to check the number of messages per
 8565                  * net. For now, this is better than nothing and it disabled
 8566                  * by default...
 8567                  */
 8568                 if ((asoc->sctp_cmt_on_off > 0) &&
 8569                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
 8570                     (max_send_per_dest > 0) &&
 8571                     (net->flight_size > max_send_per_dest)) {
 8572                         goto no_data_fill;
 8573                 }
 8574                 /*********************/
 8575                 /* Data transmission */
 8576                 /*********************/
 8577                 /*
 8578                  * if AUTH for DATA is required and no AUTH has been added
 8579                  * yet, account for this in the mtu now... if no data can be
 8580                  * bundled, this adjustment won't matter anyways since the
 8581                  * packet will be going out...
 8582                  */
 8583                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
 8584                     stcb->asoc.peer_auth_chunks);
 8585                 if (data_auth_reqd && (auth == NULL)) {
 8586                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8587                 }
 8588                 /* now lets add any data within the MTU constraints */
 8589                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8590 #ifdef INET
 8591                 case AF_INET:
 8592                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
 8593                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8594                         else
 8595                                 omtu = 0;
 8596                         break;
 8597 #endif
 8598 #ifdef INET6
 8599                 case AF_INET6:
 8600                         if (net->mtu > SCTP_MIN_OVERHEAD)
 8601                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
 8602                         else
 8603                                 omtu = 0;
 8604                         break;
 8605 #endif
 8606                 default:
 8607                         /* TSNH */
 8608                         omtu = 0;
 8609                         break;
 8610                 }
 8611                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 8612                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 8613                     (skip_data_for_this_net == 0)) ||
 8614                     (cookie)) {
 8615                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 8616                                 if (no_data_chunks) {
 8617                                         /* let only control go out */
 8618                                         *reason_code = 1;
 8619                                         break;
 8620                                 }
 8621                                 if (net->flight_size >= net->cwnd) {
 8622                                         /* skip this net, no room for data */
 8623                                         *reason_code = 2;
 8624                                         break;
 8625                                 }
 8626                                 if ((chk->whoTo != NULL) &&
 8627                                     (chk->whoTo != net)) {
 8628                                         /* Don't send the chunk on this net */
 8629                                         continue;
 8630                                 }
 8631 
 8632                                 if (asoc->sctp_cmt_on_off == 0) {
 8633                                         if ((asoc->alternate) &&
 8634                                             (asoc->alternate != net) &&
 8635                                             (chk->whoTo == NULL)) {
 8636                                                 continue;
 8637                                         } else if ((net != asoc->primary_destination) &&
 8638                                                     (asoc->alternate == NULL) &&
 8639                                             (chk->whoTo == NULL)) {
 8640                                                 continue;
 8641                                         }
 8642                                 }
 8643                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 8644                                         /*-
 8645                                          * strange, we have a chunk that is
 8646                                          * to big for its destination and
 8647                                          * yet no fragment ok flag.
 8648                                          * Something went wrong when the
 8649                                          * PMTU changed...we did not mark
 8650                                          * this chunk for some reason?? I
 8651                                          * will fix it here by letting IP
 8652                                          * fragment it for now and printing
 8653                                          * a warning. This really should not
 8654                                          * happen ...
 8655                                          */
 8656                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 8657                                             chk->send_size, mtu);
 8658                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 8659                                 }
 8660                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 8661                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
 8662                                         struct sctp_data_chunk *dchkh;
 8663 
 8664                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 8665                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 8666                                 }
 8667                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 8668                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 8669                                         /* ok we will add this one */
 8670 
 8671                                         /*
 8672                                          * Add an AUTH chunk, if chunk
 8673                                          * requires it, save the offset into
 8674                                          * the chain for AUTH
 8675                                          */
 8676                                         if (data_auth_reqd) {
 8677                                                 if (auth == NULL) {
 8678                                                         outchain = sctp_add_auth_chunk(outchain,
 8679                                                             &endoutchain,
 8680                                                             &auth,
 8681                                                             &auth_offset,
 8682                                                             stcb,
 8683                                                             SCTP_DATA);
 8684                                                         auth_keyid = chk->auth_keyid;
 8685                                                         override_ok = 0;
 8686                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8687                                                 } else if (override_ok) {
 8688                                                         /*
 8689                                                          * use this data's
 8690                                                          * keyid
 8691                                                          */
 8692                                                         auth_keyid = chk->auth_keyid;
 8693                                                         override_ok = 0;
 8694                                                 } else if (auth_keyid != chk->auth_keyid) {
 8695                                                         /*
 8696                                                          * different keyid,
 8697                                                          * so done bundling
 8698                                                          */
 8699                                                         break;
 8700                                                 }
 8701                                         }
 8702                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 8703                                             chk->send_size, chk->copy_by_ref);
 8704                                         if (outchain == NULL) {
 8705                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 8706                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8707                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8708                                                 }
 8709                                                 *reason_code = 3;
 8710                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8711                                                 return (ENOMEM);
 8712                                         }
 8713                                         /* upate our MTU size */
 8714                                         /* Do clear IP_DF ? */
 8715                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8716                                                 no_fragmentflg = 0;
 8717                                         }
 8718                                         /* unsigned subtraction of mtu */
 8719                                         if (mtu > chk->send_size)
 8720                                                 mtu -= chk->send_size;
 8721                                         else
 8722                                                 mtu = 0;
 8723                                         /* unsigned subtraction of r_mtu */
 8724                                         if (r_mtu > chk->send_size)
 8725                                                 r_mtu -= chk->send_size;
 8726                                         else
 8727                                                 r_mtu = 0;
 8728 
 8729                                         to_out += chk->send_size;
 8730                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 8731 #ifdef INVARIANTS
 8732                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
 8733 #else
 8734                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
 8735                                                     mx_mtu, to_out);
 8736 #endif
 8737                                         }
 8738                                         chk->window_probe = 0;
 8739                                         data_list[bundle_at++] = chk;
 8740                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 8741                                                 break;
 8742                                         }
 8743                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
 8744                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 8745                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
 8746                                                 } else {
 8747                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
 8748                                                 }
 8749                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
 8750                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
 8751                                                         /*
 8752                                                          * Count number of
 8753                                                          * user msg's that
 8754                                                          * were fragmented
 8755                                                          * we do this by
 8756                                                          * counting when we
 8757                                                          * see a LAST
 8758                                                          * fragment only.
 8759                                                          */
 8760                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
 8761                                         }
 8762                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
 8763                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
 8764                                                         data_list[0]->window_probe = 1;
 8765                                                         net->window_probe = 1;
 8766                                                 }
 8767                                                 break;
 8768                                         }
 8769                                 } else {
 8770                                         /*
 8771                                          * Must be sent in order of the
 8772                                          * TSN's (on a network)
 8773                                          */
 8774                                         break;
 8775                                 }
 8776                         }       /* for (chunk gather loop for this net) */
 8777                 }               /* if asoc.state OPEN */
 8778 no_data_fill:
 8779                 /* Is there something to send for this destination? */
 8780                 if (outchain) {
 8781                         /* We may need to start a control timer or two */
 8782                         if (asconf) {
 8783                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
 8784                                     stcb, net);
 8785                                 /*
 8786                                  * do NOT clear the asconf flag as it is
 8787                                  * used to do appropriate source address
 8788                                  * selection.
 8789                                  */
 8790                         }
 8791                         if (cookie) {
 8792                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8793                                 cookie = 0;
 8794                         }
 8795                         /* must start a send timer if data is being sent */
 8796                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 8797                                 /*
 8798                                  * no timer running on this destination
 8799                                  * restart it.
 8800                                  */
 8801                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8802                         }
 8803                         if (bundle_at || hbflag) {
 8804                                 /* For data/asconf and hb set time */
 8805                                 if (*now_filled == 0) {
 8806                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8807                                         *now_filled = 1;
 8808                                 }
 8809                                 net->last_sent_time = *now;
 8810                         }
 8811                         /* Now send it, if there is anything to send :> */
 8812                         if ((error = sctp_lowlevel_chunk_output(inp,
 8813                             stcb,
 8814                             net,
 8815                             (struct sockaddr *)&net->ro._l_addr,
 8816                             outchain,
 8817                             auth_offset,
 8818                             auth,
 8819                             auth_keyid,
 8820                             no_fragmentflg,
 8821                             bundle_at,
 8822                             asconf,
 8823                             inp->sctp_lport, stcb->rport,
 8824                             htonl(stcb->asoc.peer_vtag),
 8825                             net->port, NULL,
 8826                             0, 0,
 8827                             so_locked))) {
 8828                                 /* error, we could not output */
 8829                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8830                                 if (from_where == 0) {
 8831                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8832                                 }
 8833                                 if (error == ENOBUFS) {
 8834                                         asoc->ifp_had_enobuf = 1;
 8835                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8836                                 }
 8837                                 if (error == EHOSTUNREACH) {
 8838                                         /*
 8839                                          * Destination went unreachable
 8840                                          * during this send
 8841                                          */
 8842                                         sctp_move_chunks_from_net(stcb, net);
 8843                                 }
 8844                                 *reason_code = 6;
 8845                                 /*-
 8846                                  * I add this line to be paranoid. As far as
 8847                                  * I can tell the continue, takes us back to
 8848                                  * the top of the for, but just to make sure
 8849                                  * I will reset these again here.
 8850                                  */
 8851                                 ctl_cnt = bundle_at = 0;
 8852                                 continue;       /* This takes us back to the
 8853                                                  * for() for the nets. */
 8854                         } else {
 8855                                 asoc->ifp_had_enobuf = 0;
 8856                         }
 8857                         endoutchain = NULL;
 8858                         auth = NULL;
 8859                         auth_offset = 0;
 8860                         if (!no_out_cnt) {
 8861                                 *num_out += (ctl_cnt + bundle_at);
 8862                         }
 8863                         if (bundle_at) {
 8864                                 /* setup for a RTO measurement */
 8865                                 tsns_sent = data_list[0]->rec.data.tsn;
 8866                                 /* fill time if not already filled */
 8867                                 if (*now_filled == 0) {
 8868                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 8869                                         *now_filled = 1;
 8870                                         *now = asoc->time_last_sent;
 8871                                 } else {
 8872                                         asoc->time_last_sent = *now;
 8873                                 }
 8874                                 if (net->rto_needed) {
 8875                                         data_list[0]->do_rtt = 1;
 8876                                         net->rto_needed = 0;
 8877                                 }
 8878                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
 8879                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
 8880                         }
 8881                         if (one_chunk) {
 8882                                 break;
 8883                         }
 8884                 }
 8885                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8886                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
 8887                 }
 8888         }
 8889         if (old_start_at == NULL) {
 8890                 old_start_at = start_at;
 8891                 start_at = TAILQ_FIRST(&asoc->nets);
 8892                 if (old_start_at)
 8893                         goto again_one_more_time;
 8894         }
 8895 
 8896         /*
 8897          * At the end there should be no NON timed chunks hanging on this
 8898          * queue.
 8899          */
 8900         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8901                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
 8902         }
 8903         if ((*num_out == 0) && (*reason_code == 0)) {
 8904                 *reason_code = 4;
 8905         } else {
 8906                 *reason_code = 5;
 8907         }
 8908         sctp_clean_up_ctl(stcb, asoc, so_locked);
 8909         return (0);
 8910 }
 8911 
 8912 void
 8913 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
 8914 {
 8915         /*-
 8916          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 8917          * the control chunk queue.
 8918          */
 8919         struct sctp_chunkhdr *hdr;
 8920         struct sctp_tmit_chunk *chk;
 8921         struct mbuf *mat, *last_mbuf;
 8922         uint32_t chunk_length;
 8923         uint16_t padding_length;
 8924 
 8925         SCTP_TCB_LOCK_ASSERT(stcb);
 8926         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
 8927         if (op_err == NULL) {
 8928                 return;
 8929         }
 8930         last_mbuf = NULL;
 8931         chunk_length = 0;
 8932         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
 8933                 chunk_length += SCTP_BUF_LEN(mat);
 8934                 if (SCTP_BUF_NEXT(mat) == NULL) {
 8935                         last_mbuf = mat;
 8936                 }
 8937         }
 8938         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
 8939                 sctp_m_freem(op_err);
 8940                 return;
 8941         }
 8942         padding_length = chunk_length % 4;
 8943         if (padding_length != 0) {
 8944                 padding_length = 4 - padding_length;
 8945         }
 8946         if (padding_length != 0) {
 8947                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
 8948                         sctp_m_freem(op_err);
 8949                         return;
 8950                 }
 8951         }
 8952         sctp_alloc_a_chunk(stcb, chk);
 8953         if (chk == NULL) {
 8954                 /* no memory */
 8955                 sctp_m_freem(op_err);
 8956                 return;
 8957         }
 8958         chk->copy_by_ref = 0;
 8959         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
 8960         chk->rec.chunk_id.can_take_data = 0;
 8961         chk->flags = 0;
 8962         chk->send_size = (uint16_t)chunk_length;
 8963         chk->sent = SCTP_DATAGRAM_UNSENT;
 8964         chk->snd_count = 0;
 8965         chk->asoc = &stcb->asoc;
 8966         chk->data = op_err;
 8967         chk->whoTo = NULL;
 8968         hdr = mtod(op_err, struct sctp_chunkhdr *);
 8969         hdr->chunk_type = SCTP_OPERATION_ERROR;
 8970         hdr->chunk_flags = 0;
 8971         hdr->chunk_length = htons(chk->send_size);
 8972         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8973         chk->asoc->ctrl_queue_cnt++;
 8974 }
 8975 
 8976 int
 8977 sctp_send_cookie_echo(struct mbuf *m,
 8978     int offset,
 8979     struct sctp_tcb *stcb,
 8980     struct sctp_nets *net)
 8981 {
 8982         /*-
 8983          * pull out the cookie and put it at the front of the control chunk
 8984          * queue.
 8985          */
 8986         int at;
 8987         struct mbuf *cookie;
 8988         struct sctp_paramhdr param, *phdr;
 8989         struct sctp_chunkhdr *hdr;
 8990         struct sctp_tmit_chunk *chk;
 8991         uint16_t ptype, plen;
 8992 
 8993         SCTP_TCB_LOCK_ASSERT(stcb);
 8994         /* First find the cookie in the param area */
 8995         cookie = NULL;
 8996         at = offset + sizeof(struct sctp_init_chunk);
 8997         for (;;) {
 8998                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
 8999                 if (phdr == NULL) {
 9000                         return (-3);
 9001                 }
 9002                 ptype = ntohs(phdr->param_type);
 9003                 plen = ntohs(phdr->param_length);
 9004                 if (ptype == SCTP_STATE_COOKIE) {
 9005                         int pad;
 9006 
 9007                         /* found the cookie */
 9008                         if ((pad = (plen % 4))) {
 9009                                 plen += 4 - pad;
 9010                         }
 9011                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
 9012                         if (cookie == NULL) {
 9013                                 /* No memory */
 9014                                 return (-2);
 9015                         }
 9016 #ifdef SCTP_MBUF_LOGGING
 9017                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9018                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
 9019                         }
 9020 #endif
 9021                         break;
 9022                 }
 9023                 at += SCTP_SIZE32(plen);
 9024         }
 9025         /* ok, we got the cookie lets change it into a cookie echo chunk */
 9026         /* first the change from param to cookie */
 9027         hdr = mtod(cookie, struct sctp_chunkhdr *);
 9028         hdr->chunk_type = SCTP_COOKIE_ECHO;
 9029         hdr->chunk_flags = 0;
 9030         /* get the chunk stuff now and place it in the FRONT of the queue */
 9031         sctp_alloc_a_chunk(stcb, chk);
 9032         if (chk == NULL) {
 9033                 /* no memory */
 9034                 sctp_m_freem(cookie);
 9035                 return (-5);
 9036         }
 9037         chk->copy_by_ref = 0;
 9038         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
 9039         chk->rec.chunk_id.can_take_data = 0;
 9040         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9041         chk->send_size = plen;
 9042         chk->sent = SCTP_DATAGRAM_UNSENT;
 9043         chk->snd_count = 0;
 9044         chk->asoc = &stcb->asoc;
 9045         chk->data = cookie;
 9046         chk->whoTo = net;
 9047         atomic_add_int(&chk->whoTo->ref_count, 1);
 9048         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
 9049         chk->asoc->ctrl_queue_cnt++;
 9050         return (0);
 9051 }
 9052 
 9053 void
 9054 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
 9055     struct mbuf *m,
 9056     int offset,
 9057     int chk_length,
 9058     struct sctp_nets *net)
 9059 {
 9060         /*
 9061          * take a HB request and make it into a HB ack and send it.
 9062          */
 9063         struct mbuf *outchain;
 9064         struct sctp_chunkhdr *chdr;
 9065         struct sctp_tmit_chunk *chk;
 9066 
 9067 
 9068         if (net == NULL)
 9069                 /* must have a net pointer */
 9070                 return;
 9071 
 9072         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
 9073         if (outchain == NULL) {
 9074                 /* gak out of memory */
 9075                 return;
 9076         }
 9077 #ifdef SCTP_MBUF_LOGGING
 9078         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9079                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
 9080         }
 9081 #endif
 9082         chdr = mtod(outchain, struct sctp_chunkhdr *);
 9083         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
 9084         chdr->chunk_flags = 0;
 9085         if (chk_length % 4) {
 9086                 /* need pad */
 9087                 uint32_t cpthis = 0;
 9088                 int padlen;
 9089 
 9090                 padlen = 4 - (chk_length % 4);
 9091                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
 9092         }
 9093         sctp_alloc_a_chunk(stcb, chk);
 9094         if (chk == NULL) {
 9095                 /* no memory */
 9096                 sctp_m_freem(outchain);
 9097                 return;
 9098         }
 9099         chk->copy_by_ref = 0;
 9100         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
 9101         chk->rec.chunk_id.can_take_data = 1;
 9102         chk->flags = 0;
 9103         chk->send_size = chk_length;
 9104         chk->sent = SCTP_DATAGRAM_UNSENT;
 9105         chk->snd_count = 0;
 9106         chk->asoc = &stcb->asoc;
 9107         chk->data = outchain;
 9108         chk->whoTo = net;
 9109         atomic_add_int(&chk->whoTo->ref_count, 1);
 9110         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9111         chk->asoc->ctrl_queue_cnt++;
 9112 }
 9113 
 9114 void
 9115 sctp_send_cookie_ack(struct sctp_tcb *stcb)
 9116 {
 9117         /* formulate and queue a cookie-ack back to sender */
 9118         struct mbuf *cookie_ack;
 9119         struct sctp_chunkhdr *hdr;
 9120         struct sctp_tmit_chunk *chk;
 9121 
 9122         SCTP_TCB_LOCK_ASSERT(stcb);
 9123 
 9124         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
 9125         if (cookie_ack == NULL) {
 9126                 /* no mbuf's */
 9127                 return;
 9128         }
 9129         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
 9130         sctp_alloc_a_chunk(stcb, chk);
 9131         if (chk == NULL) {
 9132                 /* no memory */
 9133                 sctp_m_freem(cookie_ack);
 9134                 return;
 9135         }
 9136         chk->copy_by_ref = 0;
 9137         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
 9138         chk->rec.chunk_id.can_take_data = 1;
 9139         chk->flags = 0;
 9140         chk->send_size = sizeof(struct sctp_chunkhdr);
 9141         chk->sent = SCTP_DATAGRAM_UNSENT;
 9142         chk->snd_count = 0;
 9143         chk->asoc = &stcb->asoc;
 9144         chk->data = cookie_ack;
 9145         if (chk->asoc->last_control_chunk_from != NULL) {
 9146                 chk->whoTo = chk->asoc->last_control_chunk_from;
 9147                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9148         } else {
 9149                 chk->whoTo = NULL;
 9150         }
 9151         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
 9152         hdr->chunk_type = SCTP_COOKIE_ACK;
 9153         hdr->chunk_flags = 0;
 9154         hdr->chunk_length = htons(chk->send_size);
 9155         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
 9156         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9157         chk->asoc->ctrl_queue_cnt++;
 9158         return;
 9159 }
 9160 
 9161 
 9162 void
 9163 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
 9164 {
 9165         /* formulate and queue a SHUTDOWN-ACK back to the sender */
 9166         struct mbuf *m_shutdown_ack;
 9167         struct sctp_shutdown_ack_chunk *ack_cp;
 9168         struct sctp_tmit_chunk *chk;
 9169 
 9170         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9171         if (m_shutdown_ack == NULL) {
 9172                 /* no mbuf's */
 9173                 return;
 9174         }
 9175         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
 9176         sctp_alloc_a_chunk(stcb, chk);
 9177         if (chk == NULL) {
 9178                 /* no memory */
 9179                 sctp_m_freem(m_shutdown_ack);
 9180                 return;
 9181         }
 9182         chk->copy_by_ref = 0;
 9183         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
 9184         chk->rec.chunk_id.can_take_data = 1;
 9185         chk->flags = 0;
 9186         chk->send_size = sizeof(struct sctp_chunkhdr);
 9187         chk->sent = SCTP_DATAGRAM_UNSENT;
 9188         chk->snd_count = 0;
 9189         chk->asoc = &stcb->asoc;
 9190         chk->data = m_shutdown_ack;
 9191         chk->whoTo = net;
 9192         if (chk->whoTo) {
 9193                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9194         }
 9195         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
 9196         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
 9197         ack_cp->ch.chunk_flags = 0;
 9198         ack_cp->ch.chunk_length = htons(chk->send_size);
 9199         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
 9200         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9201         chk->asoc->ctrl_queue_cnt++;
 9202         return;
 9203 }
 9204 
 9205 void
 9206 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
 9207 {
 9208         /* formulate and queue a SHUTDOWN to the sender */
 9209         struct mbuf *m_shutdown;
 9210         struct sctp_shutdown_chunk *shutdown_cp;
 9211         struct sctp_tmit_chunk *chk;
 9212 
 9213         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 9214                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
 9215                         /* We already have a SHUTDOWN queued. Reuse it. */
 9216                         if (chk->whoTo) {
 9217                                 sctp_free_remote_addr(chk->whoTo);
 9218                                 chk->whoTo = NULL;
 9219                         }
 9220                         break;
 9221                 }
 9222         }
 9223         if (chk == NULL) {
 9224                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9225                 if (m_shutdown == NULL) {
 9226                         /* no mbuf's */
 9227                         return;
 9228                 }
 9229                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
 9230                 sctp_alloc_a_chunk(stcb, chk);
 9231                 if (chk == NULL) {
 9232                         /* no memory */
 9233                         sctp_m_freem(m_shutdown);
 9234                         return;
 9235                 }
 9236                 chk->copy_by_ref = 0;
 9237                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
 9238                 chk->rec.chunk_id.can_take_data = 1;
 9239                 chk->flags = 0;
 9240                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
 9241                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9242                 chk->snd_count = 0;
 9243                 chk->asoc = &stcb->asoc;
 9244                 chk->data = m_shutdown;
 9245                 chk->whoTo = net;
 9246                 if (chk->whoTo) {
 9247                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9248                 }
 9249                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
 9250                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
 9251                 shutdown_cp->ch.chunk_flags = 0;
 9252                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
 9253                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9254                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
 9255                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9256                 chk->asoc->ctrl_queue_cnt++;
 9257         } else {
 9258                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
 9259                 chk->whoTo = net;
 9260                 if (chk->whoTo) {
 9261                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9262                 }
 9263                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
 9264                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9265                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
 9266         }
 9267         return;
 9268 }
 9269 
 9270 void
 9271 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
 9272 {
 9273         /*
 9274          * formulate and queue an ASCONF to the peer. ASCONF parameters
 9275          * should be queued on the assoc queue.
 9276          */
 9277         struct sctp_tmit_chunk *chk;
 9278         struct mbuf *m_asconf;
 9279         int len;
 9280 
 9281         SCTP_TCB_LOCK_ASSERT(stcb);
 9282 
 9283         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
 9284             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
 9285                 /* can't send a new one if there is one in flight already */
 9286                 return;
 9287         }
 9288 
 9289         /* compose an ASCONF chunk, maximum length is PMTU */
 9290         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
 9291         if (m_asconf == NULL) {
 9292                 return;
 9293         }
 9294 
 9295         sctp_alloc_a_chunk(stcb, chk);
 9296         if (chk == NULL) {
 9297                 /* no memory */
 9298                 sctp_m_freem(m_asconf);
 9299                 return;
 9300         }
 9301 
 9302         chk->copy_by_ref = 0;
 9303         chk->rec.chunk_id.id = SCTP_ASCONF;
 9304         chk->rec.chunk_id.can_take_data = 0;
 9305         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9306         chk->data = m_asconf;
 9307         chk->send_size = len;
 9308         chk->sent = SCTP_DATAGRAM_UNSENT;
 9309         chk->snd_count = 0;
 9310         chk->asoc = &stcb->asoc;
 9311         chk->whoTo = net;
 9312         if (chk->whoTo) {
 9313                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9314         }
 9315         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
 9316         chk->asoc->ctrl_queue_cnt++;
 9317         return;
 9318 }
 9319 
 9320 void
 9321 sctp_send_asconf_ack(struct sctp_tcb *stcb)
 9322 {
 9323         /*
 9324          * formulate and queue a asconf-ack back to sender. the asconf-ack
 9325          * must be stored in the tcb.
 9326          */
 9327         struct sctp_tmit_chunk *chk;
 9328         struct sctp_asconf_ack *ack, *latest_ack;
 9329         struct mbuf *m_ack;
 9330         struct sctp_nets *net = NULL;
 9331 
 9332         SCTP_TCB_LOCK_ASSERT(stcb);
 9333         /* Get the latest ASCONF-ACK */
 9334         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
 9335         if (latest_ack == NULL) {
 9336                 return;
 9337         }
 9338         if (latest_ack->last_sent_to != NULL &&
 9339             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
 9340                 /* we're doing a retransmission */
 9341                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
 9342                 if (net == NULL) {
 9343                         /* no alternate */
 9344                         if (stcb->asoc.last_control_chunk_from == NULL) {
 9345                                 if (stcb->asoc.alternate) {
 9346                                         net = stcb->asoc.alternate;
 9347                                 } else {
 9348                                         net = stcb->asoc.primary_destination;
 9349                                 }
 9350                         } else {
 9351                                 net = stcb->asoc.last_control_chunk_from;
 9352                         }
 9353                 }
 9354         } else {
 9355                 /* normal case */
 9356                 if (stcb->asoc.last_control_chunk_from == NULL) {
 9357                         if (stcb->asoc.alternate) {
 9358                                 net = stcb->asoc.alternate;
 9359                         } else {
 9360                                 net = stcb->asoc.primary_destination;
 9361                         }
 9362                 } else {
 9363                         net = stcb->asoc.last_control_chunk_from;
 9364                 }
 9365         }
 9366         latest_ack->last_sent_to = net;
 9367 
 9368         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
 9369                 if (ack->data == NULL) {
 9370                         continue;
 9371                 }
 9372 
 9373                 /* copy the asconf_ack */
 9374                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
 9375                 if (m_ack == NULL) {
 9376                         /* couldn't copy it */
 9377                         return;
 9378                 }
 9379 #ifdef SCTP_MBUF_LOGGING
 9380                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9381                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
 9382                 }
 9383 #endif
 9384 
 9385                 sctp_alloc_a_chunk(stcb, chk);
 9386                 if (chk == NULL) {
 9387                         /* no memory */
 9388                         if (m_ack)
 9389                                 sctp_m_freem(m_ack);
 9390                         return;
 9391                 }
 9392                 chk->copy_by_ref = 0;
 9393                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
 9394                 chk->rec.chunk_id.can_take_data = 1;
 9395                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9396                 chk->whoTo = net;
 9397                 if (chk->whoTo) {
 9398                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9399                 }
 9400                 chk->data = m_ack;
 9401                 chk->send_size = ack->len;
 9402                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9403                 chk->snd_count = 0;
 9404                 chk->asoc = &stcb->asoc;
 9405 
 9406                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9407                 chk->asoc->ctrl_queue_cnt++;
 9408         }
 9409         return;
 9410 }
 9411 
 9412 
 9413 static int
 9414 sctp_chunk_retransmission(struct sctp_inpcb *inp,
 9415     struct sctp_tcb *stcb,
 9416     struct sctp_association *asoc,
 9417     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
 9418 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9419     SCTP_UNUSED
 9420 #endif
 9421 )
 9422 {
 9423         /*-
 9424          * send out one MTU of retransmission. If fast_retransmit is
 9425          * happening we ignore the cwnd. Otherwise we obey the cwnd and
 9426          * rwnd. For a Cookie or Asconf in the control chunk queue we
 9427          * retransmit them by themselves.
 9428          *
 9429          * For data chunks we will pick out the lowest TSN's in the sent_queue
 9430          * marked for resend and bundle them all together (up to a MTU of
 9431          * destination). The address to send to should have been
 9432          * selected/changed where the retransmission was marked (i.e. in FR
 9433          * or t3-timeout routines).
 9434          */
 9435         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 9436         struct sctp_tmit_chunk *chk, *fwd;
 9437         struct mbuf *m, *endofchain;
 9438         struct sctp_nets *net = NULL;
 9439         uint32_t tsns_sent = 0;
 9440         int no_fragmentflg, bundle_at, cnt_thru;
 9441         unsigned int mtu;
 9442         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
 9443         struct sctp_auth_chunk *auth = NULL;
 9444         uint32_t auth_offset = 0;
 9445         uint16_t auth_keyid;
 9446         int override_ok = 1;
 9447         int data_auth_reqd = 0;
 9448         uint32_t dmtu = 0;
 9449 
 9450         SCTP_TCB_LOCK_ASSERT(stcb);
 9451         tmr_started = ctl_cnt = bundle_at = error = 0;
 9452         no_fragmentflg = 1;
 9453         fwd_tsn = 0;
 9454         *cnt_out = 0;
 9455         fwd = NULL;
 9456         endofchain = m = NULL;
 9457         auth_keyid = stcb->asoc.authinfo.active_keyid;
 9458 #ifdef SCTP_AUDITING_ENABLED
 9459         sctp_audit_log(0xC3, 1);
 9460 #endif
 9461         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
 9462             (TAILQ_EMPTY(&asoc->control_send_queue))) {
 9463                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
 9464                     asoc->sent_queue_retran_cnt);
 9465                 asoc->sent_queue_cnt = 0;
 9466                 asoc->sent_queue_cnt_removeable = 0;
 9467                 /* send back 0/0 so we enter normal transmission */
 9468                 *cnt_out = 0;
 9469                 return (0);
 9470         }
 9471         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9472                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
 9473                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
 9474                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
 9475                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9476                                 continue;
 9477                         }
 9478                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 9479                                 if (chk != asoc->str_reset) {
 9480                                         /*
 9481                                          * not eligible for retran if its
 9482                                          * not ours
 9483                                          */
 9484                                         continue;
 9485                                 }
 9486                         }
 9487                         ctl_cnt++;
 9488                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 9489                                 fwd_tsn = 1;
 9490                         }
 9491                         /*
 9492                          * Add an AUTH chunk, if chunk requires it save the
 9493                          * offset into the chain for AUTH
 9494                          */
 9495                         if ((auth == NULL) &&
 9496                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9497                             stcb->asoc.peer_auth_chunks))) {
 9498                                 m = sctp_add_auth_chunk(m, &endofchain,
 9499                                     &auth, &auth_offset,
 9500                                     stcb,
 9501                                     chk->rec.chunk_id.id);
 9502                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9503                         }
 9504                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9505                         break;
 9506                 }
 9507         }
 9508         one_chunk = 0;
 9509         cnt_thru = 0;
 9510         /* do we have control chunks to retransmit? */
 9511         if (m != NULL) {
 9512                 /* Start a timer no matter if we succeed or fail */
 9513                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 9514                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
 9515                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
 9516                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
 9517                 chk->snd_count++;       /* update our count */
 9518                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
 9519                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
 9520                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9521                     no_fragmentflg, 0, 0,
 9522                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9523                     chk->whoTo->port, NULL,
 9524                     0, 0,
 9525                     so_locked))) {
 9526                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9527                         if (error == ENOBUFS) {
 9528                                 asoc->ifp_had_enobuf = 1;
 9529                                 SCTP_STAT_INCR(sctps_lowlevelerr);
 9530                         }
 9531                         return (error);
 9532                 } else {
 9533                         asoc->ifp_had_enobuf = 0;
 9534                 }
 9535                 endofchain = NULL;
 9536                 auth = NULL;
 9537                 auth_offset = 0;
 9538                 /*
 9539                  * We don't want to mark the net->sent time here since this
 9540                  * we use this for HB and retrans cannot measure RTT
 9541                  */
 9542                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
 9543                 *cnt_out += 1;
 9544                 chk->sent = SCTP_DATAGRAM_SENT;
 9545                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
 9546                 if (fwd_tsn == 0) {
 9547                         return (0);
 9548                 } else {
 9549                         /* Clean up the fwd-tsn list */
 9550                         sctp_clean_up_ctl(stcb, asoc, so_locked);
 9551                         return (0);
 9552                 }
 9553         }
 9554         /*
 9555          * Ok, it is just data retransmission we need to do or that and a
 9556          * fwd-tsn with it all.
 9557          */
 9558         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 9559                 return (SCTP_RETRAN_DONE);
 9560         }
 9561         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
 9562             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
 9563                 /* not yet open, resend the cookie and that is it */
 9564                 return (1);
 9565         }
 9566 #ifdef SCTP_AUDITING_ENABLED
 9567         sctp_auditing(20, inp, stcb, NULL);
 9568 #endif
 9569         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
 9570         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 9571                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9572                         /* No, not sent to this net or not ready for rtx */
 9573                         continue;
 9574                 }
 9575                 if (chk->data == NULL) {
 9576                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
 9577                             chk->rec.data.tsn, chk->snd_count, chk->sent);
 9578                         continue;
 9579                 }
 9580                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
 9581                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
 9582                         struct mbuf *op_err;
 9583                         char msg[SCTP_DIAG_INFO_LEN];
 9584 
 9585                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
 9586                             chk->rec.data.tsn, chk->snd_count);
 9587                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 9588                             msg);
 9589                         atomic_add_int(&stcb->asoc.refcnt, 1);
 9590                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
 9591                             so_locked);
 9592                         SCTP_TCB_LOCK(stcb);
 9593                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 9594                         return (SCTP_RETRAN_EXIT);
 9595                 }
 9596                 /* pick up the net */
 9597                 net = chk->whoTo;
 9598                 switch (net->ro._l_addr.sa.sa_family) {
 9599 #ifdef INET
 9600                 case AF_INET:
 9601                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 9602                         break;
 9603 #endif
 9604 #ifdef INET6
 9605                 case AF_INET6:
 9606                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9607                         break;
 9608 #endif
 9609                 default:
 9610                         /* TSNH */
 9611                         mtu = net->mtu;
 9612                         break;
 9613                 }
 9614 
 9615                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
 9616                         /* No room in peers rwnd */
 9617                         uint32_t tsn;
 9618 
 9619                         tsn = asoc->last_acked_seq + 1;
 9620                         if (tsn == chk->rec.data.tsn) {
 9621                                 /*
 9622                                  * we make a special exception for this
 9623                                  * case. The peer has no rwnd but is missing
 9624                                  * the lowest chunk.. which is probably what
 9625                                  * is holding up the rwnd.
 9626                                  */
 9627                                 goto one_chunk_around;
 9628                         }
 9629                         return (1);
 9630                 }
 9631 one_chunk_around:
 9632                 if (asoc->peers_rwnd < mtu) {
 9633                         one_chunk = 1;
 9634                         if ((asoc->peers_rwnd == 0) &&
 9635                             (asoc->total_flight == 0)) {
 9636                                 chk->window_probe = 1;
 9637                                 chk->whoTo->window_probe = 1;
 9638                         }
 9639                 }
 9640 #ifdef SCTP_AUDITING_ENABLED
 9641                 sctp_audit_log(0xC3, 2);
 9642 #endif
 9643                 bundle_at = 0;
 9644                 m = NULL;
 9645                 net->fast_retran_ip = 0;
 9646                 if (chk->rec.data.doing_fast_retransmit == 0) {
 9647                         /*
 9648                          * if no FR in progress skip destination that have
 9649                          * flight_size > cwnd.
 9650                          */
 9651                         if (net->flight_size >= net->cwnd) {
 9652                                 continue;
 9653                         }
 9654                 } else {
 9655                         /*
 9656                          * Mark the destination net to have FR recovery
 9657                          * limits put on it.
 9658                          */
 9659                         *fr_done = 1;
 9660                         net->fast_retran_ip = 1;
 9661                 }
 9662 
 9663                 /*
 9664                  * if no AUTH is yet included and this chunk requires it,
 9665                  * make sure to account for it.  We don't apply the size
 9666                  * until the AUTH chunk is actually added below in case
 9667                  * there is no room for this chunk.
 9668                  */
 9669                 if (data_auth_reqd && (auth == NULL)) {
 9670                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9671                 } else
 9672                         dmtu = 0;
 9673 
 9674                 if ((chk->send_size <= (mtu - dmtu)) ||
 9675                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9676                         /* ok we will add this one */
 9677                         if (data_auth_reqd) {
 9678                                 if (auth == NULL) {
 9679                                         m = sctp_add_auth_chunk(m,
 9680                                             &endofchain,
 9681                                             &auth,
 9682                                             &auth_offset,
 9683                                             stcb,
 9684                                             SCTP_DATA);
 9685                                         auth_keyid = chk->auth_keyid;
 9686                                         override_ok = 0;
 9687                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9688                                 } else if (override_ok) {
 9689                                         auth_keyid = chk->auth_keyid;
 9690                                         override_ok = 0;
 9691                                 } else if (chk->auth_keyid != auth_keyid) {
 9692                                         /* different keyid, so done bundling */
 9693                                         break;
 9694                                 }
 9695                         }
 9696                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9697                         if (m == NULL) {
 9698                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9699                                 return (ENOMEM);
 9700                         }
 9701                         /* Do clear IP_DF ? */
 9702                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9703                                 no_fragmentflg = 0;
 9704                         }
 9705                         /* upate our MTU size */
 9706                         if (mtu > (chk->send_size + dmtu))
 9707                                 mtu -= (chk->send_size + dmtu);
 9708                         else
 9709                                 mtu = 0;
 9710                         data_list[bundle_at++] = chk;
 9711                         if (one_chunk && (asoc->total_flight <= 0)) {
 9712                                 SCTP_STAT_INCR(sctps_windowprobed);
 9713                         }
 9714                 }
 9715                 if (one_chunk == 0) {
 9716                         /*
 9717                          * now are there anymore forward from chk to pick
 9718                          * up?
 9719                          */
 9720                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
 9721                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
 9722                                         /* Nope, not for retran */
 9723                                         continue;
 9724                                 }
 9725                                 if (fwd->whoTo != net) {
 9726                                         /* Nope, not the net in question */
 9727                                         continue;
 9728                                 }
 9729                                 if (data_auth_reqd && (auth == NULL)) {
 9730                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9731                                 } else
 9732                                         dmtu = 0;
 9733                                 if (fwd->send_size <= (mtu - dmtu)) {
 9734                                         if (data_auth_reqd) {
 9735                                                 if (auth == NULL) {
 9736                                                         m = sctp_add_auth_chunk(m,
 9737                                                             &endofchain,
 9738                                                             &auth,
 9739                                                             &auth_offset,
 9740                                                             stcb,
 9741                                                             SCTP_DATA);
 9742                                                         auth_keyid = fwd->auth_keyid;
 9743                                                         override_ok = 0;
 9744                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9745                                                 } else if (override_ok) {
 9746                                                         auth_keyid = fwd->auth_keyid;
 9747                                                         override_ok = 0;
 9748                                                 } else if (fwd->auth_keyid != auth_keyid) {
 9749                                                         /*
 9750                                                          * different keyid,
 9751                                                          * so done bundling
 9752                                                          */
 9753                                                         break;
 9754                                                 }
 9755                                         }
 9756                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
 9757                                         if (m == NULL) {
 9758                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9759                                                 return (ENOMEM);
 9760                                         }
 9761                                         /* Do clear IP_DF ? */
 9762                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9763                                                 no_fragmentflg = 0;
 9764                                         }
 9765                                         /* upate our MTU size */
 9766                                         if (mtu > (fwd->send_size + dmtu))
 9767                                                 mtu -= (fwd->send_size + dmtu);
 9768                                         else
 9769                                                 mtu = 0;
 9770                                         data_list[bundle_at++] = fwd;
 9771                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 9772                                                 break;
 9773                                         }
 9774                                 } else {
 9775                                         /* can't fit so we are done */
 9776                                         break;
 9777                                 }
 9778                         }
 9779                 }
 9780                 /* Is there something to send for this destination? */
 9781                 if (m) {
 9782                         /*
 9783                          * No matter if we fail/or succeed we should start a
 9784                          * timer. A failure is like a lost IP packet :-)
 9785                          */
 9786                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9787                                 /*
 9788                                  * no timer running on this destination
 9789                                  * restart it.
 9790                                  */
 9791                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9792                                 tmr_started = 1;
 9793                         }
 9794                         /* Now lets send it, if there is anything to send :> */
 9795                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9796                             (struct sockaddr *)&net->ro._l_addr, m,
 9797                             auth_offset, auth, auth_keyid,
 9798                             no_fragmentflg, 0, 0,
 9799                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9800                             net->port, NULL,
 9801                             0, 0,
 9802                             so_locked))) {
 9803                                 /* error, we could not output */
 9804                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9805                                 if (error == ENOBUFS) {
 9806                                         asoc->ifp_had_enobuf = 1;
 9807                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9808                                 }
 9809                                 return (error);
 9810                         } else {
 9811                                 asoc->ifp_had_enobuf = 0;
 9812                         }
 9813                         endofchain = NULL;
 9814                         auth = NULL;
 9815                         auth_offset = 0;
 9816                         /* For HB's */
 9817                         /*
 9818                          * We don't want to mark the net->sent time here
 9819                          * since this we use this for HB and retrans cannot
 9820                          * measure RTT
 9821                          */
 9822                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
 9823 
 9824                         /* For auto-close */
 9825                         cnt_thru++;
 9826                         if (*now_filled == 0) {
 9827                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 9828                                 *now = asoc->time_last_sent;
 9829                                 *now_filled = 1;
 9830                         } else {
 9831                                 asoc->time_last_sent = *now;
 9832                         }
 9833                         *cnt_out += bundle_at;
 9834 #ifdef SCTP_AUDITING_ENABLED
 9835                         sctp_audit_log(0xC4, bundle_at);
 9836 #endif
 9837                         if (bundle_at) {
 9838                                 tsns_sent = data_list[0]->rec.data.tsn;
 9839                         }
 9840                         for (i = 0; i < bundle_at; i++) {
 9841                                 SCTP_STAT_INCR(sctps_sendretransdata);
 9842                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 9843                                 /*
 9844                                  * When we have a revoked data, and we
 9845                                  * retransmit it, then we clear the revoked
 9846                                  * flag since this flag dictates if we
 9847                                  * subtracted from the fs
 9848                                  */
 9849                                 if (data_list[i]->rec.data.chunk_was_revoked) {
 9850                                         /* Deflate the cwnd */
 9851                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
 9852                                         data_list[i]->rec.data.chunk_was_revoked = 0;
 9853                                 }
 9854                                 data_list[i]->snd_count++;
 9855                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 9856                                 /* record the time */
 9857                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
 9858                                 if (data_list[i]->book_size_scale) {
 9859                                         /*
 9860                                          * need to double the book size on
 9861                                          * this one
 9862                                          */
 9863                                         data_list[i]->book_size_scale = 0;
 9864                                         /*
 9865                                          * Since we double the booksize, we
 9866                                          * must also double the output queue
 9867                                          * size, since this get shrunk when
 9868                                          * we free by this amount.
 9869                                          */
 9870                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
 9871                                         data_list[i]->book_size *= 2;
 9872 
 9873 
 9874                                 } else {
 9875                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 9876                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 9877                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 9878                                         }
 9879                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 9880                                             (uint32_t)(data_list[i]->send_size +
 9881                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 9882                                 }
 9883                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 9884                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
 9885                                             data_list[i]->whoTo->flight_size,
 9886                                             data_list[i]->book_size,
 9887                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 9888                                             data_list[i]->rec.data.tsn);
 9889                                 }
 9890                                 sctp_flight_size_increase(data_list[i]);
 9891                                 sctp_total_flight_increase(stcb, data_list[i]);
 9892                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 9893                                         /* SWS sender side engages */
 9894                                         asoc->peers_rwnd = 0;
 9895                                 }
 9896                                 if ((i == 0) &&
 9897                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
 9898                                         SCTP_STAT_INCR(sctps_sendfastretrans);
 9899                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
 9900                                             (tmr_started == 0)) {
 9901                                                 /*-
 9902                                                  * ok we just fast-retrans'd
 9903                                                  * the lowest TSN, i.e the
 9904                                                  * first on the list. In
 9905                                                  * this case we want to give
 9906                                                  * some more time to get a
 9907                                                  * SACK back without a
 9908                                                  * t3-expiring.
 9909                                                  */
 9910                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
 9911                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
 9912                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9913                                         }
 9914                                 }
 9915                         }
 9916                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 9917                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
 9918                         }
 9919 #ifdef SCTP_AUDITING_ENABLED
 9920                         sctp_auditing(21, inp, stcb, NULL);
 9921 #endif
 9922                 } else {
 9923                         /* None will fit */
 9924                         return (1);
 9925                 }
 9926                 if (asoc->sent_queue_retran_cnt <= 0) {
 9927                         /* all done we have no more to retran */
 9928                         asoc->sent_queue_retran_cnt = 0;
 9929                         break;
 9930                 }
 9931                 if (one_chunk) {
 9932                         /* No more room in rwnd */
 9933                         return (1);
 9934                 }
 9935                 /* stop the for loop here. we sent out a packet */
 9936                 break;
 9937         }
 9938         return (0);
 9939 }
 9940 
 9941 static void
 9942 sctp_timer_validation(struct sctp_inpcb *inp,
 9943     struct sctp_tcb *stcb,
 9944     struct sctp_association *asoc)
 9945 {
 9946         struct sctp_nets *net;
 9947 
 9948         /* Validate that a timer is running somewhere */
 9949         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 9950                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9951                         /* Here is a timer */
 9952                         return;
 9953                 }
 9954         }
 9955         SCTP_TCB_LOCK_ASSERT(stcb);
 9956         /* Gak, we did not have a timer somewhere */
 9957         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
 9958         if (asoc->alternate) {
 9959                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
 9960         } else {
 9961                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 9962         }
 9963         return;
 9964 }
 9965 
 9966 void
 9967 sctp_chunk_output(struct sctp_inpcb *inp,
 9968     struct sctp_tcb *stcb,
 9969     int from_where,
 9970     int so_locked
 9971 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9972     SCTP_UNUSED
 9973 #endif
 9974 )
 9975 {
 9976         /*-
 9977          * Ok this is the generic chunk service queue. we must do the
 9978          * following:
 9979          * - See if there are retransmits pending, if so we must
 9980          *   do these first.
 9981          * - Service the stream queue that is next, moving any
 9982          *   message (note I must get a complete message i.e.
 9983          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
 9984          *   TSN's
 9985          * - Check to see if the cwnd/rwnd allows any output, if so we
 9986          *   go ahead and fomulate and send the low level chunks. Making sure
 9987          *   to combine any control in the control chunk queue also.
 9988          */
 9989         struct sctp_association *asoc;
 9990         struct sctp_nets *net;
 9991         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
 9992         unsigned int burst_cnt = 0;
 9993         struct timeval now;
 9994         int now_filled = 0;
 9995         int nagle_on;
 9996         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 9997         int un_sent = 0;
 9998         int fr_done;
 9999         unsigned int tot_frs = 0;
10000 
10001         asoc = &stcb->asoc;
10002 do_it_again:
10003         /* The Nagle algorithm is only applied when handling a send call. */
10004         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10005                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10006                         nagle_on = 0;
10007                 } else {
10008                         nagle_on = 1;
10009                 }
10010         } else {
10011                 nagle_on = 0;
10012         }
10013         SCTP_TCB_LOCK_ASSERT(stcb);
10014 
10015         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10016 
10017         if ((un_sent <= 0) &&
10018             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10019             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10020             (asoc->sent_queue_retran_cnt == 0) &&
10021             (asoc->trigger_reset == 0)) {
10022                 /* Nothing to do unless there is something to be sent left */
10023                 return;
10024         }
10025         /*
10026          * Do we have something to send, data or control AND a sack timer
10027          * running, if so piggy-back the sack.
10028          */
10029         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10030                 sctp_send_sack(stcb, so_locked);
10031                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10032         }
10033         while (asoc->sent_queue_retran_cnt) {
10034                 /*-
10035                  * Ok, it is retransmission time only, we send out only ONE
10036                  * packet with a single call off to the retran code.
10037                  */
10038                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10039                         /*-
10040                          * Special hook for handling cookiess discarded
10041                          * by peer that carried data. Send cookie-ack only
10042                          * and then the next call with get the retran's.
10043                          */
10044                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10045                             from_where,
10046                             &now, &now_filled, frag_point, so_locked);
10047                         return;
10048                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10049                         /* if its not from a HB then do it */
10050                         fr_done = 0;
10051                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10052                         if (fr_done) {
10053                                 tot_frs++;
10054                         }
10055                 } else {
10056                         /*
10057                          * its from any other place, we don't allow retran
10058                          * output (only control)
10059                          */
10060                         ret = 1;
10061                 }
10062                 if (ret > 0) {
10063                         /* Can't send anymore */
10064                         /*-
10065                          * now lets push out control by calling med-level
10066                          * output once. this assures that we WILL send HB's
10067                          * if queued too.
10068                          */
10069                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10070                             from_where,
10071                             &now, &now_filled, frag_point, so_locked);
10072 #ifdef SCTP_AUDITING_ENABLED
10073                         sctp_auditing(8, inp, stcb, NULL);
10074 #endif
10075                         sctp_timer_validation(inp, stcb, asoc);
10076                         return;
10077                 }
10078                 if (ret < 0) {
10079                         /*-
10080                          * The count was off.. retran is not happening so do
10081                          * the normal retransmission.
10082                          */
10083 #ifdef SCTP_AUDITING_ENABLED
10084                         sctp_auditing(9, inp, stcb, NULL);
10085 #endif
10086                         if (ret == SCTP_RETRAN_EXIT) {
10087                                 return;
10088                         }
10089                         break;
10090                 }
10091                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10092                         /* Only one transmission allowed out of a timeout */
10093 #ifdef SCTP_AUDITING_ENABLED
10094                         sctp_auditing(10, inp, stcb, NULL);
10095 #endif
10096                         /* Push out any control */
10097                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10098                             &now, &now_filled, frag_point, so_locked);
10099                         return;
10100                 }
10101                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10102                         /* Hit FR burst limit */
10103                         return;
10104                 }
10105                 if ((num_out == 0) && (ret == 0)) {
10106                         /* No more retrans to send */
10107                         break;
10108                 }
10109         }
10110 #ifdef SCTP_AUDITING_ENABLED
10111         sctp_auditing(12, inp, stcb, NULL);
10112 #endif
10113         /* Check for bad destinations, if they exist move chunks around. */
10114         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10115                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10116                         /*-
10117                          * if possible move things off of this address we
10118                          * still may send below due to the dormant state but
10119                          * we try to find an alternate address to send to
10120                          * and if we have one we move all queued data on the
10121                          * out wheel to this alternate address.
10122                          */
10123                         if (net->ref_count > 1)
10124                                 sctp_move_chunks_from_net(stcb, net);
10125                 } else {
10126                         /*-
10127                          * if ((asoc->sat_network) || (net->addr_is_local))
10128                          * { burst_limit = asoc->max_burst *
10129                          * SCTP_SAT_NETWORK_BURST_INCR; }
10130                          */
10131                         if (asoc->max_burst > 0) {
10132                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10133                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10134                                                 /*
10135                                                  * JRS - Use the congestion
10136                                                  * control given in the
10137                                                  * congestion control module
10138                                                  */
10139                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10140                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10141                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10142                                                 }
10143                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10144                                         }
10145                                         net->fast_retran_ip = 0;
10146                                 } else {
10147                                         if (net->flight_size == 0) {
10148                                                 /*
10149                                                  * Should be decaying the
10150                                                  * cwnd here
10151                                                  */
10152                                                 ;
10153                                         }
10154                                 }
10155                         }
10156                 }
10157 
10158         }
10159         burst_cnt = 0;
10160         do {
10161                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10162                     &reason_code, 0, from_where,
10163                     &now, &now_filled, frag_point, so_locked);
10164                 if (error) {
10165                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10166                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10167                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10168                         }
10169                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10170                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10171                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10172                         }
10173                         break;
10174                 }
10175                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10176 
10177                 tot_out += num_out;
10178                 burst_cnt++;
10179                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10180                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10181                         if (num_out == 0) {
10182                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10183                         }
10184                 }
10185                 if (nagle_on) {
10186                         /*
10187                          * When the Nagle algorithm is used, look at how
10188                          * much is unsent, then if its smaller than an MTU
10189                          * and we have data in flight we stop, except if we
10190                          * are handling a fragmented user message.
10191                          */
10192                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10193                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10194                             (stcb->asoc.total_flight > 0)) {
10195 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10196                                 break;
10197                         }
10198                 }
10199                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10200                     TAILQ_EMPTY(&asoc->send_queue) &&
10201                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10202                         /* Nothing left to send */
10203                         break;
10204                 }
10205                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10206                         /* Nothing left to send */
10207                         break;
10208                 }
10209         } while (num_out &&
10210             ((asoc->max_burst == 0) ||
10211             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10212             (burst_cnt < asoc->max_burst)));
10213 
10214         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10215                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10216                         SCTP_STAT_INCR(sctps_maxburstqueued);
10217                         asoc->burst_limit_applied = 1;
10218                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10219                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10220                         }
10221                 } else {
10222                         asoc->burst_limit_applied = 0;
10223                 }
10224         }
10225         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10226                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10227         }
10228         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10229             tot_out);
10230 
10231         /*-
10232          * Now we need to clean up the control chunk chain if a ECNE is on
10233          * it. It must be marked as UNSENT again so next call will continue
10234          * to send it until such time that we get a CWR, to remove it.
10235          */
10236         if (stcb->asoc.ecn_echo_cnt_onq)
10237                 sctp_fix_ecn_echo(asoc);
10238 
10239         if (stcb->asoc.trigger_reset) {
10240                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10241                         goto do_it_again;
10242                 }
10243         }
10244         return;
10245 }
10246 
10247 
10248 int
10249 sctp_output(
10250     struct sctp_inpcb *inp,
10251     struct mbuf *m,
10252     struct sockaddr *addr,
10253     struct mbuf *control,
10254     struct thread *p,
10255     int flags)
10256 {
10257         if (inp == NULL) {
10258                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10259                 return (EINVAL);
10260         }
10261 
10262         if (inp->sctp_socket == NULL) {
10263                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10264                 return (EINVAL);
10265         }
10266         return (sctp_sosend(inp->sctp_socket,
10267             addr,
10268             (struct uio *)NULL,
10269             m,
10270             control,
10271             flags, p
10272             ));
10273 }
10274 
10275 void
10276 send_forward_tsn(struct sctp_tcb *stcb,
10277     struct sctp_association *asoc)
10278 {
10279         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10280         struct sctp_forward_tsn_chunk *fwdtsn;
10281         struct sctp_strseq *strseq;
10282         struct sctp_strseq_mid *strseq_m;
10283         uint32_t advance_peer_ack_point;
10284         unsigned int cnt_of_space, i, ovh;
10285         unsigned int space_needed;
10286         unsigned int cnt_of_skipped = 0;
10287 
10288         SCTP_TCB_LOCK_ASSERT(stcb);
10289         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10290                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10291                         /* mark it to unsent */
10292                         chk->sent = SCTP_DATAGRAM_UNSENT;
10293                         chk->snd_count = 0;
10294                         /* Do we correct its output location? */
10295                         if (chk->whoTo) {
10296                                 sctp_free_remote_addr(chk->whoTo);
10297                                 chk->whoTo = NULL;
10298                         }
10299                         goto sctp_fill_in_rest;
10300                 }
10301         }
10302         /* Ok if we reach here we must build one */
10303         sctp_alloc_a_chunk(stcb, chk);
10304         if (chk == NULL) {
10305                 return;
10306         }
10307         asoc->fwd_tsn_cnt++;
10308         chk->copy_by_ref = 0;
10309         /*
10310          * We don't do the old thing here since this is used not for on-wire
10311          * but to tell if we are sending a fwd-tsn by the stack during
10312          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10313          */
10314         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10315         chk->rec.chunk_id.can_take_data = 0;
10316         chk->flags = 0;
10317         chk->asoc = asoc;
10318         chk->whoTo = NULL;
10319         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10320         if (chk->data == NULL) {
10321                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10322                 return;
10323         }
10324         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10325         chk->sent = SCTP_DATAGRAM_UNSENT;
10326         chk->snd_count = 0;
10327         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10328         asoc->ctrl_queue_cnt++;
10329 sctp_fill_in_rest:
10330         /*-
10331          * Here we go through and fill out the part that deals with
10332          * stream/seq of the ones we skip.
10333          */
10334         SCTP_BUF_LEN(chk->data) = 0;
10335         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10336                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10337                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10338                         /* no more to look at */
10339                         break;
10340                 }
10341                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10342                         /* We don't report these */
10343                         continue;
10344                 }
10345                 cnt_of_skipped++;
10346         }
10347         if (asoc->idata_supported) {
10348                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10349                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10350         } else {
10351                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10352                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10353         }
10354         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10355 
10356         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10357                 ovh = SCTP_MIN_OVERHEAD;
10358         } else {
10359                 ovh = SCTP_MIN_V4_OVERHEAD;
10360         }
10361         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10362                 /* trim to a mtu size */
10363                 cnt_of_space = asoc->smallest_mtu - ovh;
10364         }
10365         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10366                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10367                     0xff, 0, cnt_of_skipped,
10368                     asoc->advanced_peer_ack_point);
10369         }
10370         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10371         if (cnt_of_space < space_needed) {
10372                 /*-
10373                  * ok we must trim down the chunk by lowering the
10374                  * advance peer ack point.
10375                  */
10376                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10377                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10378                             0xff, 0xff, cnt_of_space,
10379                             space_needed);
10380                 }
10381                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10382                 if (asoc->idata_supported) {
10383                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10384                 } else {
10385                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10386                 }
10387                 /*-
10388                  * Go through and find the TSN that will be the one
10389                  * we report.
10390                  */
10391                 at = TAILQ_FIRST(&asoc->sent_queue);
10392                 if (at != NULL) {
10393                         for (i = 0; i < cnt_of_skipped; i++) {
10394                                 tp1 = TAILQ_NEXT(at, sctp_next);
10395                                 if (tp1 == NULL) {
10396                                         break;
10397                                 }
10398                                 at = tp1;
10399                         }
10400                 }
10401                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10402                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10403                             0xff, cnt_of_skipped, at->rec.data.tsn,
10404                             asoc->advanced_peer_ack_point);
10405                 }
10406                 last = at;
10407                 /*-
10408                  * last now points to last one I can report, update
10409                  * peer ack point
10410                  */
10411                 if (last) {
10412                         advance_peer_ack_point = last->rec.data.tsn;
10413                 }
10414                 if (asoc->idata_supported) {
10415                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10416                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10417                 } else {
10418                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10419                             cnt_of_skipped * sizeof(struct sctp_strseq);
10420                 }
10421         }
10422         chk->send_size = space_needed;
10423         /* Setup the chunk */
10424         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10425         fwdtsn->ch.chunk_length = htons(chk->send_size);
10426         fwdtsn->ch.chunk_flags = 0;
10427         if (asoc->idata_supported) {
10428                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10429         } else {
10430                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10431         }
10432         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10433         SCTP_BUF_LEN(chk->data) = chk->send_size;
10434         fwdtsn++;
10435         /*-
10436          * Move pointer to after the fwdtsn and transfer to the
10437          * strseq pointer.
10438          */
10439         if (asoc->idata_supported) {
10440                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10441                 strseq = NULL;
10442         } else {
10443                 strseq = (struct sctp_strseq *)fwdtsn;
10444                 strseq_m = NULL;
10445         }
10446         /*-
10447          * Now populate the strseq list. This is done blindly
10448          * without pulling out duplicate stream info. This is
10449          * inefficent but won't harm the process since the peer will
10450          * look at these in sequence and will thus release anything.
10451          * It could mean we exceed the PMTU and chop off some that
10452          * we could have included.. but this is unlikely (aka 1432/4
10453          * would mean 300+ stream seq's would have to be reported in
10454          * one FWD-TSN. With a bit of work we can later FIX this to
10455          * optimize and pull out duplicates.. but it does add more
10456          * overhead. So for now... not!
10457          */
10458         i = 0;
10459         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10460                 if (i >= cnt_of_skipped) {
10461                         break;
10462                 }
10463                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10464                         /* We don't report these */
10465                         continue;
10466                 }
10467                 if (at->rec.data.tsn == advance_peer_ack_point) {
10468                         at->rec.data.fwd_tsn_cnt = 0;
10469                 }
10470                 if (asoc->idata_supported) {
10471                         strseq_m->sid = htons(at->rec.data.sid);
10472                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10473                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10474                         } else {
10475                                 strseq_m->flags = 0;
10476                         }
10477                         strseq_m->mid = htonl(at->rec.data.mid);
10478                         strseq_m++;
10479                 } else {
10480                         strseq->sid = htons(at->rec.data.sid);
10481                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10482                         strseq++;
10483                 }
10484                 i++;
10485         }
10486         return;
10487 }
10488 
10489 void
10490 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10491 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10492     SCTP_UNUSED
10493 #endif
10494 )
10495 {
10496         /*-
10497          * Queue up a SACK or NR-SACK in the control queue.
10498          * We must first check to see if a SACK or NR-SACK is
10499          * somehow on the control queue.
10500          * If so, we will take and and remove the old one.
10501          */
10502         struct sctp_association *asoc;
10503         struct sctp_tmit_chunk *chk, *a_chk;
10504         struct sctp_sack_chunk *sack;
10505         struct sctp_nr_sack_chunk *nr_sack;
10506         struct sctp_gap_ack_block *gap_descriptor;
10507         const struct sack_track *selector;
10508         int mergeable = 0;
10509         int offset;
10510         caddr_t limit;
10511         uint32_t *dup;
10512         int limit_reached = 0;
10513         unsigned int i, siz, j;
10514         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10515         int num_dups = 0;
10516         int space_req;
10517         uint32_t highest_tsn;
10518         uint8_t flags;
10519         uint8_t type;
10520         uint8_t tsn_map;
10521 
10522         if (stcb->asoc.nrsack_supported == 1) {
10523                 type = SCTP_NR_SELECTIVE_ACK;
10524         } else {
10525                 type = SCTP_SELECTIVE_ACK;
10526         }
10527         a_chk = NULL;
10528         asoc = &stcb->asoc;
10529         SCTP_TCB_LOCK_ASSERT(stcb);
10530         if (asoc->last_data_chunk_from == NULL) {
10531                 /* Hmm we never received anything */
10532                 return;
10533         }
10534         sctp_slide_mapping_arrays(stcb);
10535         sctp_set_rwnd(stcb, asoc);
10536         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10537                 if (chk->rec.chunk_id.id == type) {
10538                         /* Hmm, found a sack already on queue, remove it */
10539                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10540                         asoc->ctrl_queue_cnt--;
10541                         a_chk = chk;
10542                         if (a_chk->data) {
10543                                 sctp_m_freem(a_chk->data);
10544                                 a_chk->data = NULL;
10545                         }
10546                         if (a_chk->whoTo) {
10547                                 sctp_free_remote_addr(a_chk->whoTo);
10548                                 a_chk->whoTo = NULL;
10549                         }
10550                         break;
10551                 }
10552         }
10553         if (a_chk == NULL) {
10554                 sctp_alloc_a_chunk(stcb, a_chk);
10555                 if (a_chk == NULL) {
10556                         /* No memory so we drop the idea, and set a timer */
10557                         if (stcb->asoc.delayed_ack) {
10558                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10559                                     stcb->sctp_ep, stcb, NULL,
10560                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10561                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10562                                     stcb->sctp_ep, stcb, NULL);
10563                         } else {
10564                                 stcb->asoc.send_sack = 1;
10565                         }
10566                         return;
10567                 }
10568                 a_chk->copy_by_ref = 0;
10569                 a_chk->rec.chunk_id.id = type;
10570                 a_chk->rec.chunk_id.can_take_data = 1;
10571         }
10572         /* Clear our pkt counts */
10573         asoc->data_pkts_seen = 0;
10574 
10575         a_chk->flags = 0;
10576         a_chk->asoc = asoc;
10577         a_chk->snd_count = 0;
10578         a_chk->send_size = 0;   /* fill in later */
10579         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10580         a_chk->whoTo = NULL;
10581 
10582         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10583                 /*-
10584                  * Ok, the destination for the SACK is unreachable, lets see if
10585                  * we can select an alternate to asoc->last_data_chunk_from
10586                  */
10587                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10588                 if (a_chk->whoTo == NULL) {
10589                         /* Nope, no alternate */
10590                         a_chk->whoTo = asoc->last_data_chunk_from;
10591                 }
10592         } else {
10593                 a_chk->whoTo = asoc->last_data_chunk_from;
10594         }
10595         if (a_chk->whoTo) {
10596                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10597         }
10598         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10599                 highest_tsn = asoc->highest_tsn_inside_map;
10600         } else {
10601                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10602         }
10603         if (highest_tsn == asoc->cumulative_tsn) {
10604                 /* no gaps */
10605                 if (type == SCTP_SELECTIVE_ACK) {
10606                         space_req = sizeof(struct sctp_sack_chunk);
10607                 } else {
10608                         space_req = sizeof(struct sctp_nr_sack_chunk);
10609                 }
10610         } else {
10611                 /* gaps get a cluster */
10612                 space_req = MCLBYTES;
10613         }
10614         /* Ok now lets formulate a MBUF with our sack */
10615         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10616         if ((a_chk->data == NULL) ||
10617             (a_chk->whoTo == NULL)) {
10618                 /* rats, no mbuf memory */
10619                 if (a_chk->data) {
10620                         /* was a problem with the destination */
10621                         sctp_m_freem(a_chk->data);
10622                         a_chk->data = NULL;
10623                 }
10624                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10625                 /* sa_ignore NO_NULL_CHK */
10626                 if (stcb->asoc.delayed_ack) {
10627                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10628                             stcb->sctp_ep, stcb, NULL,
10629                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10630                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10631                             stcb->sctp_ep, stcb, NULL);
10632                 } else {
10633                         stcb->asoc.send_sack = 1;
10634                 }
10635                 return;
10636         }
10637         /* ok, lets go through and fill it in */
10638         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10639         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10640         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10641                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10642         }
10643         limit = mtod(a_chk->data, caddr_t);
10644         limit += space;
10645 
10646         flags = 0;
10647 
10648         if ((asoc->sctp_cmt_on_off > 0) &&
10649             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10650                 /*-
10651                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10652                  * received, then set high bit to 1, else 0. Reset
10653                  * pkts_rcvd.
10654                  */
10655                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10656                 asoc->cmt_dac_pkts_rcvd = 0;
10657         }
10658 #ifdef SCTP_ASOCLOG_OF_TSNS
10659         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10660         stcb->asoc.cumack_log_atsnt++;
10661         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10662                 stcb->asoc.cumack_log_atsnt = 0;
10663         }
10664 #endif
10665         /* reset the readers interpretation */
10666         stcb->freed_by_sorcv_sincelast = 0;
10667 
10668         if (type == SCTP_SELECTIVE_ACK) {
10669                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10670                 nr_sack = NULL;
10671                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10672                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10673                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10674                 } else {
10675                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10676                 }
10677         } else {
10678                 sack = NULL;
10679                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10680                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10681                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10682                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10683                 } else {
10684                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10685                 }
10686         }
10687 
10688         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10689                 offset = 1;
10690         } else {
10691                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10692         }
10693         if (((type == SCTP_SELECTIVE_ACK) &&
10694             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10695             ((type == SCTP_NR_SELECTIVE_ACK) &&
10696             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10697                 /* we have a gap .. maybe */
10698                 for (i = 0; i < siz; i++) {
10699                         tsn_map = asoc->mapping_array[i];
10700                         if (type == SCTP_SELECTIVE_ACK) {
10701                                 tsn_map |= asoc->nr_mapping_array[i];
10702                         }
10703                         if (i == 0) {
10704                                 /*
10705                                  * Clear all bits corresponding to TSNs
10706                                  * smaller or equal to the cumulative TSN.
10707                                  */
10708                                 tsn_map &= (~0U << (1 - offset));
10709                         }
10710                         selector = &sack_array[tsn_map];
10711                         if (mergeable && selector->right_edge) {
10712                                 /*
10713                                  * Backup, left and right edges were ok to
10714                                  * merge.
10715                                  */
10716                                 num_gap_blocks--;
10717                                 gap_descriptor--;
10718                         }
10719                         if (selector->num_entries == 0)
10720                                 mergeable = 0;
10721                         else {
10722                                 for (j = 0; j < selector->num_entries; j++) {
10723                                         if (mergeable && selector->right_edge) {
10724                                                 /*
10725                                                  * do a merge by NOT setting
10726                                                  * the left side
10727                                                  */
10728                                                 mergeable = 0;
10729                                         } else {
10730                                                 /*
10731                                                  * no merge, set the left
10732                                                  * side
10733                                                  */
10734                                                 mergeable = 0;
10735                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10736                                         }
10737                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10738                                         num_gap_blocks++;
10739                                         gap_descriptor++;
10740                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10741                                                 /* no more room */
10742                                                 limit_reached = 1;
10743                                                 break;
10744                                         }
10745                                 }
10746                                 if (selector->left_edge) {
10747                                         mergeable = 1;
10748                                 }
10749                         }
10750                         if (limit_reached) {
10751                                 /* Reached the limit stop */
10752                                 break;
10753                         }
10754                         offset += 8;
10755                 }
10756         }
10757         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10758             (limit_reached == 0)) {
10759 
10760                 mergeable = 0;
10761 
10762                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10763                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10764                 } else {
10765                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10766                 }
10767 
10768                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10769                         offset = 1;
10770                 } else {
10771                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10772                 }
10773                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10774                         /* we have a gap .. maybe */
10775                         for (i = 0; i < siz; i++) {
10776                                 tsn_map = asoc->nr_mapping_array[i];
10777                                 if (i == 0) {
10778                                         /*
10779                                          * Clear all bits corresponding to
10780                                          * TSNs smaller or equal to the
10781                                          * cumulative TSN.
10782                                          */
10783                                         tsn_map &= (~0U << (1 - offset));
10784                                 }
10785                                 selector = &sack_array[tsn_map];
10786                                 if (mergeable && selector->right_edge) {
10787                                         /*
10788                                          * Backup, left and right edges were
10789                                          * ok to merge.
10790                                          */
10791                                         num_nr_gap_blocks--;
10792                                         gap_descriptor--;
10793                                 }
10794                                 if (selector->num_entries == 0)
10795                                         mergeable = 0;
10796                                 else {
10797                                         for (j = 0; j < selector->num_entries; j++) {
10798                                                 if (mergeable && selector->right_edge) {
10799                                                         /*
10800                                                          * do a merge by NOT
10801                                                          * setting the left
10802                                                          * side
10803                                                          */
10804                                                         mergeable = 0;
10805                                                 } else {
10806                                                         /*
10807                                                          * no merge, set the
10808                                                          * left side
10809                                                          */
10810                                                         mergeable = 0;
10811                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10812                                                 }
10813                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10814                                                 num_nr_gap_blocks++;
10815                                                 gap_descriptor++;
10816                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10817                                                         /* no more room */
10818                                                         limit_reached = 1;
10819                                                         break;
10820                                                 }
10821                                         }
10822                                         if (selector->left_edge) {
10823                                                 mergeable = 1;
10824                                         }
10825                                 }
10826                                 if (limit_reached) {
10827                                         /* Reached the limit stop */
10828                                         break;
10829                                 }
10830                                 offset += 8;
10831                         }
10832                 }
10833         }
10834         /* now we must add any dups we are going to report. */
10835         if ((limit_reached == 0) && (asoc->numduptsns)) {
10836                 dup = (uint32_t *)gap_descriptor;
10837                 for (i = 0; i < asoc->numduptsns; i++) {
10838                         *dup = htonl(asoc->dup_tsns[i]);
10839                         dup++;
10840                         num_dups++;
10841                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10842                                 /* no more room */
10843                                 break;
10844                         }
10845                 }
10846                 asoc->numduptsns = 0;
10847         }
10848         /*
10849          * now that the chunk is prepared queue it to the control chunk
10850          * queue.
10851          */
10852         if (type == SCTP_SELECTIVE_ACK) {
10853                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10854                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10855                     num_dups * sizeof(int32_t));
10856                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10857                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10858                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10859                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10860                 sack->sack.num_dup_tsns = htons(num_dups);
10861                 sack->ch.chunk_type = type;
10862                 sack->ch.chunk_flags = flags;
10863                 sack->ch.chunk_length = htons(a_chk->send_size);
10864         } else {
10865                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10866                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10867                     num_dups * sizeof(int32_t));
10868                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10869                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10870                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10871                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10872                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10873                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10874                 nr_sack->nr_sack.reserved = 0;
10875                 nr_sack->ch.chunk_type = type;
10876                 nr_sack->ch.chunk_flags = flags;
10877                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10878         }
10879         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10880         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10881         asoc->ctrl_queue_cnt++;
10882         asoc->send_sack = 0;
10883         SCTP_STAT_INCR(sctps_sendsacks);
10884         return;
10885 }
10886 
10887 void
10888 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10889 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10890     SCTP_UNUSED
10891 #endif
10892 )
10893 {
10894         struct mbuf *m_abort, *m, *m_last;
10895         struct mbuf *m_out, *m_end = NULL;
10896         struct sctp_abort_chunk *abort;
10897         struct sctp_auth_chunk *auth = NULL;
10898         struct sctp_nets *net;
10899         uint32_t vtag;
10900         uint32_t auth_offset = 0;
10901         int error;
10902         uint16_t cause_len, chunk_len, padding_len;
10903 
10904         SCTP_TCB_LOCK_ASSERT(stcb);
10905         /*-
10906          * Add an AUTH chunk, if chunk requires it and save the offset into
10907          * the chain for AUTH
10908          */
10909         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10910             stcb->asoc.peer_auth_chunks)) {
10911                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10912                     stcb, SCTP_ABORT_ASSOCIATION);
10913                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10914         } else {
10915                 m_out = NULL;
10916         }
10917         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10918         if (m_abort == NULL) {
10919                 if (m_out) {
10920                         sctp_m_freem(m_out);
10921                 }
10922                 if (operr) {
10923                         sctp_m_freem(operr);
10924                 }
10925                 return;
10926         }
10927         /* link in any error */
10928         SCTP_BUF_NEXT(m_abort) = operr;
10929         cause_len = 0;
10930         m_last = NULL;
10931         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10932                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10933                 if (SCTP_BUF_NEXT(m) == NULL) {
10934                         m_last = m;
10935                 }
10936         }
10937         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10938         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10939         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10940         if (m_out == NULL) {
10941                 /* NO Auth chunk prepended, so reserve space in front */
10942                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10943                 m_out = m_abort;
10944         } else {
10945                 /* Put AUTH chunk at the front of the chain */
10946                 SCTP_BUF_NEXT(m_end) = m_abort;
10947         }
10948         if (stcb->asoc.alternate) {
10949                 net = stcb->asoc.alternate;
10950         } else {
10951                 net = stcb->asoc.primary_destination;
10952         }
10953         /* Fill in the ABORT chunk header. */
10954         abort = mtod(m_abort, struct sctp_abort_chunk *);
10955         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10956         if (stcb->asoc.peer_vtag == 0) {
10957                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10958                 vtag = stcb->asoc.my_vtag;
10959                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10960         } else {
10961                 vtag = stcb->asoc.peer_vtag;
10962                 abort->ch.chunk_flags = 0;
10963         }
10964         abort->ch.chunk_length = htons(chunk_len);
10965         /* Add padding, if necessary. */
10966         if (padding_len > 0) {
10967                 if ((m_last == NULL) ||
10968                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10969                         sctp_m_freem(m_out);
10970                         return;
10971                 }
10972         }
10973         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10974             (struct sockaddr *)&net->ro._l_addr,
10975             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10976             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10977             stcb->asoc.primary_destination->port, NULL,
10978             0, 0,
10979             so_locked))) {
10980                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10981                 if (error == ENOBUFS) {
10982                         stcb->asoc.ifp_had_enobuf = 1;
10983                         SCTP_STAT_INCR(sctps_lowlevelerr);
10984                 }
10985         } else {
10986                 stcb->asoc.ifp_had_enobuf = 0;
10987         }
10988         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10989 }
10990 
10991 void
10992 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10993     struct sctp_nets *net,
10994     int reflect_vtag)
10995 {
10996         /* formulate and SEND a SHUTDOWN-COMPLETE */
10997         struct mbuf *m_shutdown_comp;
10998         struct sctp_shutdown_complete_chunk *shutdown_complete;
10999         uint32_t vtag;
11000         int error;
11001         uint8_t flags;
11002 
11003         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11004         if (m_shutdown_comp == NULL) {
11005                 /* no mbuf's */
11006                 return;
11007         }
11008         if (reflect_vtag) {
11009                 flags = SCTP_HAD_NO_TCB;
11010                 vtag = stcb->asoc.my_vtag;
11011         } else {
11012                 flags = 0;
11013                 vtag = stcb->asoc.peer_vtag;
11014         }
11015         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11016         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11017         shutdown_complete->ch.chunk_flags = flags;
11018         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11019         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11020         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11021             (struct sockaddr *)&net->ro._l_addr,
11022             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11023             stcb->sctp_ep->sctp_lport, stcb->rport,
11024             htonl(vtag),
11025             net->port, NULL,
11026             0, 0,
11027             SCTP_SO_NOT_LOCKED))) {
11028                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11029                 if (error == ENOBUFS) {
11030                         stcb->asoc.ifp_had_enobuf = 1;
11031                         SCTP_STAT_INCR(sctps_lowlevelerr);
11032                 }
11033         } else {
11034                 stcb->asoc.ifp_had_enobuf = 0;
11035         }
11036         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11037         return;
11038 }
11039 
11040 static void
11041 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11042     struct sctphdr *sh, uint32_t vtag,
11043     uint8_t type, struct mbuf *cause,
11044     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11045     uint32_t vrf_id, uint16_t port)
11046 {
11047         struct mbuf *o_pak;
11048         struct mbuf *mout;
11049         struct sctphdr *shout;
11050         struct sctp_chunkhdr *ch;
11051 #if defined(INET) || defined(INET6)
11052         struct udphdr *udp;
11053 #endif
11054         int ret, len, cause_len, padding_len;
11055 #ifdef INET
11056         struct sockaddr_in *src_sin, *dst_sin;
11057         struct ip *ip;
11058 #endif
11059 #ifdef INET6
11060         struct sockaddr_in6 *src_sin6, *dst_sin6;
11061         struct ip6_hdr *ip6;
11062 #endif
11063 
11064         /* Compute the length of the cause and add final padding. */
11065         cause_len = 0;
11066         if (cause != NULL) {
11067                 struct mbuf *m_at, *m_last = NULL;
11068 
11069                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11070                         if (SCTP_BUF_NEXT(m_at) == NULL)
11071                                 m_last = m_at;
11072                         cause_len += SCTP_BUF_LEN(m_at);
11073                 }
11074                 padding_len = cause_len % 4;
11075                 if (padding_len != 0) {
11076                         padding_len = 4 - padding_len;
11077                 }
11078                 if (padding_len != 0) {
11079                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11080                                 sctp_m_freem(cause);
11081                                 return;
11082                         }
11083                 }
11084         } else {
11085                 padding_len = 0;
11086         }
11087         /* Get an mbuf for the header. */
11088         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11089         switch (dst->sa_family) {
11090 #ifdef INET
11091         case AF_INET:
11092                 len += sizeof(struct ip);
11093                 break;
11094 #endif
11095 #ifdef INET6
11096         case AF_INET6:
11097                 len += sizeof(struct ip6_hdr);
11098                 break;
11099 #endif
11100         default:
11101                 break;
11102         }
11103 #if defined(INET) || defined(INET6)
11104         if (port) {
11105                 len += sizeof(struct udphdr);
11106         }
11107 #endif
11108         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11109         if (mout == NULL) {
11110                 if (cause) {
11111                         sctp_m_freem(cause);
11112                 }
11113                 return;
11114         }
11115         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11116         SCTP_BUF_LEN(mout) = len;
11117         SCTP_BUF_NEXT(mout) = cause;
11118         M_SETFIB(mout, fibnum);
11119         mout->m_pkthdr.flowid = mflowid;
11120         M_HASHTYPE_SET(mout, mflowtype);
11121 #ifdef INET
11122         ip = NULL;
11123 #endif
11124 #ifdef INET6
11125         ip6 = NULL;
11126 #endif
11127         switch (dst->sa_family) {
11128 #ifdef INET
11129         case AF_INET:
11130                 src_sin = (struct sockaddr_in *)src;
11131                 dst_sin = (struct sockaddr_in *)dst;
11132                 ip = mtod(mout, struct ip *);
11133                 ip->ip_v = IPVERSION;
11134                 ip->ip_hl = (sizeof(struct ip) >> 2);
11135                 ip->ip_tos = 0;
11136                 ip->ip_off = htons(IP_DF);
11137                 ip_fillid(ip);
11138                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11139                 if (port) {
11140                         ip->ip_p = IPPROTO_UDP;
11141                 } else {
11142                         ip->ip_p = IPPROTO_SCTP;
11143                 }
11144                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11145                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11146                 ip->ip_sum = 0;
11147                 len = sizeof(struct ip);
11148                 shout = (struct sctphdr *)((caddr_t)ip + len);
11149                 break;
11150 #endif
11151 #ifdef INET6
11152         case AF_INET6:
11153                 src_sin6 = (struct sockaddr_in6 *)src;
11154                 dst_sin6 = (struct sockaddr_in6 *)dst;
11155                 ip6 = mtod(mout, struct ip6_hdr *);
11156                 ip6->ip6_flow = htonl(0x60000000);
11157                 if (V_ip6_auto_flowlabel) {
11158                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11159                 }
11160                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11161                 if (port) {
11162                         ip6->ip6_nxt = IPPROTO_UDP;
11163                 } else {
11164                         ip6->ip6_nxt = IPPROTO_SCTP;
11165                 }
11166                 ip6->ip6_src = dst_sin6->sin6_addr;
11167                 ip6->ip6_dst = src_sin6->sin6_addr;
11168                 len = sizeof(struct ip6_hdr);
11169                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11170                 break;
11171 #endif
11172         default:
11173                 len = 0;
11174                 shout = mtod(mout, struct sctphdr *);
11175                 break;
11176         }
11177 #if defined(INET) || defined(INET6)
11178         if (port) {
11179                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11180                         sctp_m_freem(mout);
11181                         return;
11182                 }
11183                 udp = (struct udphdr *)shout;
11184                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11185                 udp->uh_dport = port;
11186                 udp->uh_sum = 0;
11187                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11188                     sizeof(struct sctphdr) +
11189                     sizeof(struct sctp_chunkhdr) +
11190                     cause_len + padding_len));
11191                 len += sizeof(struct udphdr);
11192                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11193         } else {
11194                 udp = NULL;
11195         }
11196 #endif
11197         shout->src_port = sh->dest_port;
11198         shout->dest_port = sh->src_port;
11199         shout->checksum = 0;
11200         if (vtag) {
11201                 shout->v_tag = htonl(vtag);
11202         } else {
11203                 shout->v_tag = sh->v_tag;
11204         }
11205         len += sizeof(struct sctphdr);
11206         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11207         ch->chunk_type = type;
11208         if (vtag) {
11209                 ch->chunk_flags = 0;
11210         } else {
11211                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11212         }
11213         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11214         len += sizeof(struct sctp_chunkhdr);
11215         len += cause_len + padding_len;
11216 
11217         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11218                 sctp_m_freem(mout);
11219                 return;
11220         }
11221         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11222         switch (dst->sa_family) {
11223 #ifdef INET
11224         case AF_INET:
11225                 if (port) {
11226                         if (V_udp_cksum) {
11227                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11228                         } else {
11229                                 udp->uh_sum = 0;
11230                         }
11231                 }
11232                 ip->ip_len = htons(len);
11233                 if (port) {
11234                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11235                         SCTP_STAT_INCR(sctps_sendswcrc);
11236                         if (V_udp_cksum) {
11237                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11238                         }
11239                 } else {
11240                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11241                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11242                         SCTP_STAT_INCR(sctps_sendhwcrc);
11243                 }
11244 #ifdef SCTP_PACKET_LOGGING
11245                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11246                         sctp_packet_log(o_pak);
11247                 }
11248 #endif
11249                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11250                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11251                 break;
11252 #endif
11253 #ifdef INET6
11254         case AF_INET6:
11255                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11256                 if (port) {
11257                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11258                         SCTP_STAT_INCR(sctps_sendswcrc);
11259                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11260                                 udp->uh_sum = 0xffff;
11261                         }
11262                 } else {
11263                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11264                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11265                         SCTP_STAT_INCR(sctps_sendhwcrc);
11266                 }
11267 #ifdef SCTP_PACKET_LOGGING
11268                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11269                         sctp_packet_log(o_pak);
11270                 }
11271 #endif
11272                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11273                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11274                 break;
11275 #endif
11276         default:
11277                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11278                     dst->sa_family);
11279                 sctp_m_freem(mout);
11280                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11281                 return;
11282         }
11283         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11284         if (port) {
11285                 UDPSTAT_INC(udps_opackets);
11286         }
11287         SCTP_STAT_INCR(sctps_sendpackets);
11288         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11289         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11290         if (ret) {
11291                 SCTP_STAT_INCR(sctps_senderrors);
11292         }
11293         return;
11294 }
11295 
11296 void
11297 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11298     struct sctphdr *sh,
11299     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11300     uint32_t vrf_id, uint16_t port)
11301 {
11302         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11303             mflowtype, mflowid, fibnum,
11304             vrf_id, port);
11305 }
11306 
11307 void
11308 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11309 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11310     SCTP_UNUSED
11311 #endif
11312 )
11313 {
11314         struct sctp_tmit_chunk *chk;
11315         struct sctp_heartbeat_chunk *hb;
11316         struct timeval now;
11317 
11318         SCTP_TCB_LOCK_ASSERT(stcb);
11319         if (net == NULL) {
11320                 return;
11321         }
11322         (void)SCTP_GETTIME_TIMEVAL(&now);
11323         switch (net->ro._l_addr.sa.sa_family) {
11324 #ifdef INET
11325         case AF_INET:
11326                 break;
11327 #endif
11328 #ifdef INET6
11329         case AF_INET6:
11330                 break;
11331 #endif
11332         default:
11333                 return;
11334         }
11335         sctp_alloc_a_chunk(stcb, chk);
11336         if (chk == NULL) {
11337                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11338                 return;
11339         }
11340 
11341         chk->copy_by_ref = 0;
11342         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11343         chk->rec.chunk_id.can_take_data = 1;
11344         chk->flags = 0;
11345         chk->asoc = &stcb->asoc;
11346         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11347 
11348         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11349         if (chk->data == NULL) {
11350                 sctp_free_a_chunk(stcb, chk, so_locked);
11351                 return;
11352         }
11353         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11354         SCTP_BUF_LEN(chk->data) = chk->send_size;
11355         chk->sent = SCTP_DATAGRAM_UNSENT;
11356         chk->snd_count = 0;
11357         chk->whoTo = net;
11358         atomic_add_int(&chk->whoTo->ref_count, 1);
11359         /* Now we have a mbuf that we can fill in with the details */
11360         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11361         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11362         /* fill out chunk header */
11363         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11364         hb->ch.chunk_flags = 0;
11365         hb->ch.chunk_length = htons(chk->send_size);
11366         /* Fill out hb parameter */
11367         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11368         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11369         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11370         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11371         /* Did our user request this one, put it in */
11372         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11373         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11374         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11375                 /*
11376                  * we only take from the entropy pool if the address is not
11377                  * confirmed.
11378                  */
11379                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11380                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11381         } else {
11382                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11383                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11384         }
11385         switch (net->ro._l_addr.sa.sa_family) {
11386 #ifdef INET
11387         case AF_INET:
11388                 memcpy(hb->heartbeat.hb_info.address,
11389                     &net->ro._l_addr.sin.sin_addr,
11390                     sizeof(net->ro._l_addr.sin.sin_addr));
11391                 break;
11392 #endif
11393 #ifdef INET6
11394         case AF_INET6:
11395                 memcpy(hb->heartbeat.hb_info.address,
11396                     &net->ro._l_addr.sin6.sin6_addr,
11397                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11398                 break;
11399 #endif
11400         default:
11401                 if (chk->data) {
11402                         sctp_m_freem(chk->data);
11403                         chk->data = NULL;
11404                 }
11405                 sctp_free_a_chunk(stcb, chk, so_locked);
11406                 return;
11407                 break;
11408         }
11409         net->hb_responded = 0;
11410         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11411         stcb->asoc.ctrl_queue_cnt++;
11412         SCTP_STAT_INCR(sctps_sendheartbeat);
11413         return;
11414 }
11415 
11416 void
11417 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11418     uint32_t high_tsn)
11419 {
11420         struct sctp_association *asoc;
11421         struct sctp_ecne_chunk *ecne;
11422         struct sctp_tmit_chunk *chk;
11423 
11424         if (net == NULL) {
11425                 return;
11426         }
11427         asoc = &stcb->asoc;
11428         SCTP_TCB_LOCK_ASSERT(stcb);
11429         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11430                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11431                         /* found a previous ECN_ECHO update it if needed */
11432                         uint32_t cnt, ctsn;
11433 
11434                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11435                         ctsn = ntohl(ecne->tsn);
11436                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11437                                 ecne->tsn = htonl(high_tsn);
11438                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11439                         }
11440                         cnt = ntohl(ecne->num_pkts_since_cwr);
11441                         cnt++;
11442                         ecne->num_pkts_since_cwr = htonl(cnt);
11443                         return;
11444                 }
11445         }
11446         /* nope could not find one to update so we must build one */
11447         sctp_alloc_a_chunk(stcb, chk);
11448         if (chk == NULL) {
11449                 return;
11450         }
11451         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11452         chk->copy_by_ref = 0;
11453         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11454         chk->rec.chunk_id.can_take_data = 0;
11455         chk->flags = 0;
11456         chk->asoc = &stcb->asoc;
11457         chk->send_size = sizeof(struct sctp_ecne_chunk);
11458         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11459         if (chk->data == NULL) {
11460                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11461                 return;
11462         }
11463         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11464         SCTP_BUF_LEN(chk->data) = chk->send_size;
11465         chk->sent = SCTP_DATAGRAM_UNSENT;
11466         chk->snd_count = 0;
11467         chk->whoTo = net;
11468         atomic_add_int(&chk->whoTo->ref_count, 1);
11469 
11470         stcb->asoc.ecn_echo_cnt_onq++;
11471         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11472         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11473         ecne->ch.chunk_flags = 0;
11474         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11475         ecne->tsn = htonl(high_tsn);
11476         ecne->num_pkts_since_cwr = htonl(1);
11477         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11478         asoc->ctrl_queue_cnt++;
11479 }
11480 
11481 void
11482 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11483     struct mbuf *m, int len, int iphlen, int bad_crc)
11484 {
11485         struct sctp_association *asoc;
11486         struct sctp_pktdrop_chunk *drp;
11487         struct sctp_tmit_chunk *chk;
11488         uint8_t *datap;
11489         int was_trunc = 0;
11490         int fullsz = 0;
11491         long spc;
11492         int offset;
11493         struct sctp_chunkhdr *ch, chunk_buf;
11494         unsigned int chk_length;
11495 
11496         if (!stcb) {
11497                 return;
11498         }
11499         asoc = &stcb->asoc;
11500         SCTP_TCB_LOCK_ASSERT(stcb);
11501         if (asoc->pktdrop_supported == 0) {
11502                 /*-
11503                  * peer must declare support before I send one.
11504                  */
11505                 return;
11506         }
11507         if (stcb->sctp_socket == NULL) {
11508                 return;
11509         }
11510         sctp_alloc_a_chunk(stcb, chk);
11511         if (chk == NULL) {
11512                 return;
11513         }
11514         chk->copy_by_ref = 0;
11515         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11516         chk->rec.chunk_id.can_take_data = 1;
11517         chk->flags = 0;
11518         len -= iphlen;
11519         chk->send_size = len;
11520         /* Validate that we do not have an ABORT in here. */
11521         offset = iphlen + sizeof(struct sctphdr);
11522         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11523             sizeof(*ch), (uint8_t *)&chunk_buf);
11524         while (ch != NULL) {
11525                 chk_length = ntohs(ch->chunk_length);
11526                 if (chk_length < sizeof(*ch)) {
11527                         /* break to abort land */
11528                         break;
11529                 }
11530                 switch (ch->chunk_type) {
11531                 case SCTP_PACKET_DROPPED:
11532                 case SCTP_ABORT_ASSOCIATION:
11533                 case SCTP_INITIATION_ACK:
11534                         /**
11535                          * We don't respond with an PKT-DROP to an ABORT
11536                          * or PKT-DROP. We also do not respond to an
11537                          * INIT-ACK, because we can't know if the initiation
11538                          * tag is correct or not.
11539                          */
11540                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11541                         return;
11542                 default:
11543                         break;
11544                 }
11545                 offset += SCTP_SIZE32(chk_length);
11546                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11547                     sizeof(*ch), (uint8_t *)&chunk_buf);
11548         }
11549 
11550         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11551             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11552                 /*
11553                  * only send 1 mtu worth, trim off the excess on the end.
11554                  */
11555                 fullsz = len;
11556                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11557                 was_trunc = 1;
11558         }
11559         chk->asoc = &stcb->asoc;
11560         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11561         if (chk->data == NULL) {
11562 jump_out:
11563                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11564                 return;
11565         }
11566         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11567         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11568         if (drp == NULL) {
11569                 sctp_m_freem(chk->data);
11570                 chk->data = NULL;
11571                 goto jump_out;
11572         }
11573         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11574             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11575         chk->book_size_scale = 0;
11576         if (was_trunc) {
11577                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11578                 drp->trunc_len = htons(fullsz);
11579                 /*
11580                  * Len is already adjusted to size minus overhead above take
11581                  * out the pkt_drop chunk itself from it.
11582                  */
11583                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11584                 len = chk->send_size;
11585         } else {
11586                 /* no truncation needed */
11587                 drp->ch.chunk_flags = 0;
11588                 drp->trunc_len = htons(0);
11589         }
11590         if (bad_crc) {
11591                 drp->ch.chunk_flags |= SCTP_BADCRC;
11592         }
11593         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11594         SCTP_BUF_LEN(chk->data) = chk->send_size;
11595         chk->sent = SCTP_DATAGRAM_UNSENT;
11596         chk->snd_count = 0;
11597         if (net) {
11598                 /* we should hit here */
11599                 chk->whoTo = net;
11600                 atomic_add_int(&chk->whoTo->ref_count, 1);
11601         } else {
11602                 chk->whoTo = NULL;
11603         }
11604         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11605         drp->ch.chunk_length = htons(chk->send_size);
11606         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11607         if (spc < 0) {
11608                 spc = 0;
11609         }
11610         drp->bottle_bw = htonl(spc);
11611         if (asoc->my_rwnd) {
11612                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11613                     asoc->size_on_all_streams +
11614                     asoc->my_rwnd_control_len +
11615                     stcb->sctp_socket->so_rcv.sb_cc);
11616         } else {
11617                 /*-
11618                  * If my rwnd is 0, possibly from mbuf depletion as well as
11619                  * space used, tell the peer there is NO space aka onq == bw
11620                  */
11621                 drp->current_onq = htonl(spc);
11622         }
11623         drp->reserved = 0;
11624         datap = drp->data;
11625         m_copydata(m, iphlen, len, (caddr_t)datap);
11626         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11627         asoc->ctrl_queue_cnt++;
11628 }
11629 
11630 void
11631 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11632 {
11633         struct sctp_association *asoc;
11634         struct sctp_cwr_chunk *cwr;
11635         struct sctp_tmit_chunk *chk;
11636 
11637         SCTP_TCB_LOCK_ASSERT(stcb);
11638         if (net == NULL) {
11639                 return;
11640         }
11641         asoc = &stcb->asoc;
11642         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11643                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11644                         /*
11645                          * found a previous CWR queued to same destination
11646                          * update it if needed
11647                          */
11648                         uint32_t ctsn;
11649 
11650                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11651                         ctsn = ntohl(cwr->tsn);
11652                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11653                                 cwr->tsn = htonl(high_tsn);
11654                         }
11655                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11656                                 /* Make sure override is carried */
11657                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11658                         }
11659                         return;
11660                 }
11661         }
11662         sctp_alloc_a_chunk(stcb, chk);
11663         if (chk == NULL) {
11664                 return;
11665         }
11666         chk->copy_by_ref = 0;
11667         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11668         chk->rec.chunk_id.can_take_data = 1;
11669         chk->flags = 0;
11670         chk->asoc = &stcb->asoc;
11671         chk->send_size = sizeof(struct sctp_cwr_chunk);
11672         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11673         if (chk->data == NULL) {
11674                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11675                 return;
11676         }
11677         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11678         SCTP_BUF_LEN(chk->data) = chk->send_size;
11679         chk->sent = SCTP_DATAGRAM_UNSENT;
11680         chk->snd_count = 0;
11681         chk->whoTo = net;
11682         atomic_add_int(&chk->whoTo->ref_count, 1);
11683         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11684         cwr->ch.chunk_type = SCTP_ECN_CWR;
11685         cwr->ch.chunk_flags = override;
11686         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11687         cwr->tsn = htonl(high_tsn);
11688         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11689         asoc->ctrl_queue_cnt++;
11690 }
11691 
11692 static int
11693 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11694     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11695 {
11696         uint16_t len, old_len, i;
11697         struct sctp_stream_reset_out_request *req_out;
11698         struct sctp_chunkhdr *ch;
11699         int at;
11700         int number_entries = 0;
11701 
11702         ch = mtod(chk->data, struct sctp_chunkhdr *);
11703         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11704         /* get to new offset for the param. */
11705         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11706         /* now how long will this param be? */
11707         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11708                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11709                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11710                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11711                         number_entries++;
11712                 }
11713         }
11714         if (number_entries == 0) {
11715                 return (0);
11716         }
11717         if (number_entries == stcb->asoc.streamoutcnt) {
11718                 number_entries = 0;
11719         }
11720         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11721                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11722         }
11723         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11724         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11725         req_out->ph.param_length = htons(len);
11726         req_out->request_seq = htonl(seq);
11727         req_out->response_seq = htonl(resp_seq);
11728         req_out->send_reset_at_tsn = htonl(last_sent);
11729         at = 0;
11730         if (number_entries) {
11731                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11732                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11733                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11734                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11735                                 req_out->list_of_streams[at] = htons(i);
11736                                 at++;
11737                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11738                                 if (at >= number_entries) {
11739                                         break;
11740                                 }
11741                         }
11742                 }
11743         } else {
11744                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11745                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11746                 }
11747         }
11748         if (SCTP_SIZE32(len) > len) {
11749                 /*-
11750                  * Need to worry about the pad we may end up adding to the
11751                  * end. This is easy since the struct is either aligned to 4
11752                  * bytes or 2 bytes off.
11753                  */
11754                 req_out->list_of_streams[number_entries] = 0;
11755         }
11756         /* now fix the chunk length */
11757         ch->chunk_length = htons(len + old_len);
11758         chk->book_size = len + old_len;
11759         chk->book_size_scale = 0;
11760         chk->send_size = SCTP_SIZE32(chk->book_size);
11761         SCTP_BUF_LEN(chk->data) = chk->send_size;
11762         return (1);
11763 }
11764 
11765 static void
11766 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11767     int number_entries, uint16_t *list,
11768     uint32_t seq)
11769 {
11770         uint16_t len, old_len, i;
11771         struct sctp_stream_reset_in_request *req_in;
11772         struct sctp_chunkhdr *ch;
11773 
11774         ch = mtod(chk->data, struct sctp_chunkhdr *);
11775         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11776 
11777         /* get to new offset for the param. */
11778         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11779         /* now how long will this param be? */
11780         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11781         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11782         req_in->ph.param_length = htons(len);
11783         req_in->request_seq = htonl(seq);
11784         if (number_entries) {
11785                 for (i = 0; i < number_entries; i++) {
11786                         req_in->list_of_streams[i] = htons(list[i]);
11787                 }
11788         }
11789         if (SCTP_SIZE32(len) > len) {
11790                 /*-
11791                  * Need to worry about the pad we may end up adding to the
11792                  * end. This is easy since the struct is either aligned to 4
11793                  * bytes or 2 bytes off.
11794                  */
11795                 req_in->list_of_streams[number_entries] = 0;
11796         }
11797         /* now fix the chunk length */
11798         ch->chunk_length = htons(len + old_len);
11799         chk->book_size = len + old_len;
11800         chk->book_size_scale = 0;
11801         chk->send_size = SCTP_SIZE32(chk->book_size);
11802         SCTP_BUF_LEN(chk->data) = chk->send_size;
11803         return;
11804 }
11805 
11806 static void
11807 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11808     uint32_t seq)
11809 {
11810         uint16_t len, old_len;
11811         struct sctp_stream_reset_tsn_request *req_tsn;
11812         struct sctp_chunkhdr *ch;
11813 
11814         ch = mtod(chk->data, struct sctp_chunkhdr *);
11815         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11816 
11817         /* get to new offset for the param. */
11818         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11819         /* now how long will this param be? */
11820         len = sizeof(struct sctp_stream_reset_tsn_request);
11821         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11822         req_tsn->ph.param_length = htons(len);
11823         req_tsn->request_seq = htonl(seq);
11824 
11825         /* now fix the chunk length */
11826         ch->chunk_length = htons(len + old_len);
11827         chk->send_size = len + old_len;
11828         chk->book_size = SCTP_SIZE32(chk->send_size);
11829         chk->book_size_scale = 0;
11830         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11831         return;
11832 }
11833 
11834 void
11835 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11836     uint32_t resp_seq, uint32_t result)
11837 {
11838         uint16_t len, old_len;
11839         struct sctp_stream_reset_response *resp;
11840         struct sctp_chunkhdr *ch;
11841 
11842         ch = mtod(chk->data, struct sctp_chunkhdr *);
11843         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11844 
11845         /* get to new offset for the param. */
11846         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11847         /* now how long will this param be? */
11848         len = sizeof(struct sctp_stream_reset_response);
11849         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11850         resp->ph.param_length = htons(len);
11851         resp->response_seq = htonl(resp_seq);
11852         resp->result = ntohl(result);
11853 
11854         /* now fix the chunk length */
11855         ch->chunk_length = htons(len + old_len);
11856         chk->book_size = len + old_len;
11857         chk->book_size_scale = 0;
11858         chk->send_size = SCTP_SIZE32(chk->book_size);
11859         SCTP_BUF_LEN(chk->data) = chk->send_size;
11860         return;
11861 }
11862 
11863 void
11864 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11865     struct sctp_stream_reset_list *ent,
11866     int response)
11867 {
11868         struct sctp_association *asoc;
11869         struct sctp_tmit_chunk *chk;
11870         struct sctp_chunkhdr *ch;
11871 
11872         asoc = &stcb->asoc;
11873 
11874         /*
11875          * Reset our last reset action to the new one IP -> response
11876          * (PERFORMED probably). This assures that if we fail to send, a
11877          * retran from the peer will get the new response.
11878          */
11879         asoc->last_reset_action[0] = response;
11880         if (asoc->stream_reset_outstanding) {
11881                 return;
11882         }
11883         sctp_alloc_a_chunk(stcb, chk);
11884         if (chk == NULL) {
11885                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11886                 return;
11887         }
11888         chk->copy_by_ref = 0;
11889         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11890         chk->rec.chunk_id.can_take_data = 0;
11891         chk->flags = 0;
11892         chk->asoc = &stcb->asoc;
11893         chk->book_size = sizeof(struct sctp_chunkhdr);
11894         chk->send_size = SCTP_SIZE32(chk->book_size);
11895         chk->book_size_scale = 0;
11896         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11897         if (chk->data == NULL) {
11898                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11899                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11900                 return;
11901         }
11902         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11903         /* setup chunk parameters */
11904         chk->sent = SCTP_DATAGRAM_UNSENT;
11905         chk->snd_count = 0;
11906         if (stcb->asoc.alternate) {
11907                 chk->whoTo = stcb->asoc.alternate;
11908         } else {
11909                 chk->whoTo = stcb->asoc.primary_destination;
11910         }
11911         ch = mtod(chk->data, struct sctp_chunkhdr *);
11912         ch->chunk_type = SCTP_STREAM_RESET;
11913         ch->chunk_flags = 0;
11914         ch->chunk_length = htons(chk->book_size);
11915         atomic_add_int(&chk->whoTo->ref_count, 1);
11916         SCTP_BUF_LEN(chk->data) = chk->send_size;
11917         sctp_add_stream_reset_result(chk, ent->seq, response);
11918         /* insert the chunk for sending */
11919         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11920             chk,
11921             sctp_next);
11922         asoc->ctrl_queue_cnt++;
11923 }
11924 
11925 void
11926 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11927     uint32_t resp_seq, uint32_t result,
11928     uint32_t send_una, uint32_t recv_next)
11929 {
11930         uint16_t len, old_len;
11931         struct sctp_stream_reset_response_tsn *resp;
11932         struct sctp_chunkhdr *ch;
11933 
11934         ch = mtod(chk->data, struct sctp_chunkhdr *);
11935         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11936 
11937         /* get to new offset for the param. */
11938         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11939         /* now how long will this param be? */
11940         len = sizeof(struct sctp_stream_reset_response_tsn);
11941         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11942         resp->ph.param_length = htons(len);
11943         resp->response_seq = htonl(resp_seq);
11944         resp->result = htonl(result);
11945         resp->senders_next_tsn = htonl(send_una);
11946         resp->receivers_next_tsn = htonl(recv_next);
11947 
11948         /* now fix the chunk length */
11949         ch->chunk_length = htons(len + old_len);
11950         chk->book_size = len + old_len;
11951         chk->send_size = SCTP_SIZE32(chk->book_size);
11952         chk->book_size_scale = 0;
11953         SCTP_BUF_LEN(chk->data) = chk->send_size;
11954         return;
11955 }
11956 
11957 static void
11958 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11959     uint32_t seq,
11960     uint16_t adding)
11961 {
11962         uint16_t len, old_len;
11963         struct sctp_chunkhdr *ch;
11964         struct sctp_stream_reset_add_strm *addstr;
11965 
11966         ch = mtod(chk->data, struct sctp_chunkhdr *);
11967         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11968 
11969         /* get to new offset for the param. */
11970         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11971         /* now how long will this param be? */
11972         len = sizeof(struct sctp_stream_reset_add_strm);
11973 
11974         /* Fill it out. */
11975         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11976         addstr->ph.param_length = htons(len);
11977         addstr->request_seq = htonl(seq);
11978         addstr->number_of_streams = htons(adding);
11979         addstr->reserved = 0;
11980 
11981         /* now fix the chunk length */
11982         ch->chunk_length = htons(len + old_len);
11983         chk->send_size = len + old_len;
11984         chk->book_size = SCTP_SIZE32(chk->send_size);
11985         chk->book_size_scale = 0;
11986         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11987         return;
11988 }
11989 
11990 static void
11991 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11992     uint32_t seq,
11993     uint16_t adding)
11994 {
11995         uint16_t len, old_len;
11996         struct sctp_chunkhdr *ch;
11997         struct sctp_stream_reset_add_strm *addstr;
11998 
11999         ch = mtod(chk->data, struct sctp_chunkhdr *);
12000         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12001 
12002         /* get to new offset for the param. */
12003         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12004         /* now how long will this param be? */
12005         len = sizeof(struct sctp_stream_reset_add_strm);
12006         /* Fill it out. */
12007         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12008         addstr->ph.param_length = htons(len);
12009         addstr->request_seq = htonl(seq);
12010         addstr->number_of_streams = htons(adding);
12011         addstr->reserved = 0;
12012 
12013         /* now fix the chunk length */
12014         ch->chunk_length = htons(len + old_len);
12015         chk->send_size = len + old_len;
12016         chk->book_size = SCTP_SIZE32(chk->send_size);
12017         chk->book_size_scale = 0;
12018         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12019         return;
12020 }
12021 
12022 int
12023 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12024 {
12025         struct sctp_association *asoc;
12026         struct sctp_tmit_chunk *chk;
12027         struct sctp_chunkhdr *ch;
12028         uint32_t seq;
12029 
12030         asoc = &stcb->asoc;
12031         asoc->trigger_reset = 0;
12032         if (asoc->stream_reset_outstanding) {
12033                 return (EALREADY);
12034         }
12035         sctp_alloc_a_chunk(stcb, chk);
12036         if (chk == NULL) {
12037                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12038                 return (ENOMEM);
12039         }
12040         chk->copy_by_ref = 0;
12041         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12042         chk->rec.chunk_id.can_take_data = 0;
12043         chk->flags = 0;
12044         chk->asoc = &stcb->asoc;
12045         chk->book_size = sizeof(struct sctp_chunkhdr);
12046         chk->send_size = SCTP_SIZE32(chk->book_size);
12047         chk->book_size_scale = 0;
12048         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12049         if (chk->data == NULL) {
12050                 sctp_free_a_chunk(stcb, chk, so_locked);
12051                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12052                 return (ENOMEM);
12053         }
12054         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12055 
12056         /* setup chunk parameters */
12057         chk->sent = SCTP_DATAGRAM_UNSENT;
12058         chk->snd_count = 0;
12059         if (stcb->asoc.alternate) {
12060                 chk->whoTo = stcb->asoc.alternate;
12061         } else {
12062                 chk->whoTo = stcb->asoc.primary_destination;
12063         }
12064         ch = mtod(chk->data, struct sctp_chunkhdr *);
12065         ch->chunk_type = SCTP_STREAM_RESET;
12066         ch->chunk_flags = 0;
12067         ch->chunk_length = htons(chk->book_size);
12068         atomic_add_int(&chk->whoTo->ref_count, 1);
12069         SCTP_BUF_LEN(chk->data) = chk->send_size;
12070         seq = stcb->asoc.str_reset_seq_out;
12071         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12072                 seq++;
12073                 asoc->stream_reset_outstanding++;
12074         } else {
12075                 m_freem(chk->data);
12076                 chk->data = NULL;
12077                 sctp_free_a_chunk(stcb, chk, so_locked);
12078                 return (ENOENT);
12079         }
12080         asoc->str_reset = chk;
12081         /* insert the chunk for sending */
12082         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12083             chk,
12084             sctp_next);
12085         asoc->ctrl_queue_cnt++;
12086 
12087         if (stcb->asoc.send_sack) {
12088                 sctp_send_sack(stcb, so_locked);
12089         }
12090         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12091         return (0);
12092 }
12093 
12094 int
12095 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12096     uint16_t number_entries, uint16_t *list,
12097     uint8_t send_in_req,
12098     uint8_t send_tsn_req,
12099     uint8_t add_stream,
12100     uint16_t adding_o,
12101     uint16_t adding_i, uint8_t peer_asked)
12102 {
12103         struct sctp_association *asoc;
12104         struct sctp_tmit_chunk *chk;
12105         struct sctp_chunkhdr *ch;
12106         int can_send_out_req = 0;
12107         uint32_t seq;
12108 
12109         asoc = &stcb->asoc;
12110         if (asoc->stream_reset_outstanding) {
12111                 /*-
12112                  * Already one pending, must get ACK back to clear the flag.
12113                  */
12114                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12115                 return (EBUSY);
12116         }
12117         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12118             (add_stream == 0)) {
12119                 /* nothing to do */
12120                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12121                 return (EINVAL);
12122         }
12123         if (send_tsn_req && send_in_req) {
12124                 /* error, can't do that */
12125                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12126                 return (EINVAL);
12127         } else if (send_in_req) {
12128                 can_send_out_req = 1;
12129         }
12130         if (number_entries > (MCLBYTES -
12131             SCTP_MIN_OVERHEAD -
12132             sizeof(struct sctp_chunkhdr) -
12133             sizeof(struct sctp_stream_reset_out_request)) /
12134             sizeof(uint16_t)) {
12135                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12136                 return (ENOMEM);
12137         }
12138         sctp_alloc_a_chunk(stcb, chk);
12139         if (chk == NULL) {
12140                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12141                 return (ENOMEM);
12142         }
12143         chk->copy_by_ref = 0;
12144         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12145         chk->rec.chunk_id.can_take_data = 0;
12146         chk->flags = 0;
12147         chk->asoc = &stcb->asoc;
12148         chk->book_size = sizeof(struct sctp_chunkhdr);
12149         chk->send_size = SCTP_SIZE32(chk->book_size);
12150         chk->book_size_scale = 0;
12151         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12152         if (chk->data == NULL) {
12153                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12154                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12155                 return (ENOMEM);
12156         }
12157         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12158 
12159         /* setup chunk parameters */
12160         chk->sent = SCTP_DATAGRAM_UNSENT;
12161         chk->snd_count = 0;
12162         if (stcb->asoc.alternate) {
12163                 chk->whoTo = stcb->asoc.alternate;
12164         } else {
12165                 chk->whoTo = stcb->asoc.primary_destination;
12166         }
12167         atomic_add_int(&chk->whoTo->ref_count, 1);
12168         ch = mtod(chk->data, struct sctp_chunkhdr *);
12169         ch->chunk_type = SCTP_STREAM_RESET;
12170         ch->chunk_flags = 0;
12171         ch->chunk_length = htons(chk->book_size);
12172         SCTP_BUF_LEN(chk->data) = chk->send_size;
12173 
12174         seq = stcb->asoc.str_reset_seq_out;
12175         if (can_send_out_req) {
12176                 int ret;
12177 
12178                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12179                 if (ret) {
12180                         seq++;
12181                         asoc->stream_reset_outstanding++;
12182                 }
12183         }
12184         if ((add_stream & 1) &&
12185             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12186                 /* Need to allocate more */
12187                 struct sctp_stream_out *oldstream;
12188                 struct sctp_stream_queue_pending *sp, *nsp;
12189                 int i;
12190 #if defined(SCTP_DETAILED_STR_STATS)
12191                 int j;
12192 #endif
12193 
12194                 oldstream = stcb->asoc.strmout;
12195                 /* get some more */
12196                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12197                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12198                     SCTP_M_STRMO);
12199                 if (stcb->asoc.strmout == NULL) {
12200                         uint8_t x;
12201 
12202                         stcb->asoc.strmout = oldstream;
12203                         /* Turn off the bit */
12204                         x = add_stream & 0xfe;
12205                         add_stream = x;
12206                         goto skip_stuff;
12207                 }
12208                 /*
12209                  * Ok now we proceed with copying the old out stuff and
12210                  * initializing the new stuff.
12211                  */
12212                 SCTP_TCB_SEND_LOCK(stcb);
12213                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12214                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12215                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12216                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12217                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12218                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12219                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12220                         stcb->asoc.strmout[i].sid = i;
12221                         stcb->asoc.strmout[i].state = oldstream[i].state;
12222                         /* FIX ME FIX ME */
12223                         /*
12224                          * This should be a SS_COPY operation FIX ME STREAM
12225                          * SCHEDULER EXPERT
12226                          */
12227                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12228                         /* now anything on those queues? */
12229                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12230                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12231                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12232                         }
12233 
12234                 }
12235                 /* now the new streams */
12236                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12237                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12238                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12239                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12240 #if defined(SCTP_DETAILED_STR_STATS)
12241                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12242                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12243                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12244                         }
12245 #else
12246                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12247                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12248 #endif
12249                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12250                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12251                         stcb->asoc.strmout[i].sid = i;
12252                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12253                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12254                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12255                 }
12256                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12257                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12258                 SCTP_TCB_SEND_UNLOCK(stcb);
12259         }
12260 skip_stuff:
12261         if ((add_stream & 1) && (adding_o > 0)) {
12262                 asoc->strm_pending_add_size = adding_o;
12263                 asoc->peer_req_out = peer_asked;
12264                 sctp_add_an_out_stream(chk, seq, adding_o);
12265                 seq++;
12266                 asoc->stream_reset_outstanding++;
12267         }
12268         if ((add_stream & 2) && (adding_i > 0)) {
12269                 sctp_add_an_in_stream(chk, seq, adding_i);
12270                 seq++;
12271                 asoc->stream_reset_outstanding++;
12272         }
12273         if (send_in_req) {
12274                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12275                 seq++;
12276                 asoc->stream_reset_outstanding++;
12277         }
12278         if (send_tsn_req) {
12279                 sctp_add_stream_reset_tsn(chk, seq);
12280                 asoc->stream_reset_outstanding++;
12281         }
12282         asoc->str_reset = chk;
12283         /* insert the chunk for sending */
12284         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12285             chk,
12286             sctp_next);
12287         asoc->ctrl_queue_cnt++;
12288         if (stcb->asoc.send_sack) {
12289                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12290         }
12291         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12292         return (0);
12293 }
12294 
12295 void
12296 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12297     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12298     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12299     uint32_t vrf_id, uint16_t port)
12300 {
12301         /* Don't respond to an ABORT with an ABORT. */
12302         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12303                 if (cause)
12304                         sctp_m_freem(cause);
12305                 return;
12306         }
12307         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12308             mflowtype, mflowid, fibnum,
12309             vrf_id, port);
12310         return;
12311 }
12312 
12313 void
12314 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12315     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12316     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12317     uint32_t vrf_id, uint16_t port)
12318 {
12319         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12320             mflowtype, mflowid, fibnum,
12321             vrf_id, port);
12322         return;
12323 }
12324 
12325 static struct mbuf *
12326 sctp_copy_resume(struct uio *uio,
12327     int max_send_len,
12328     int user_marks_eor,
12329     int *error,
12330     uint32_t *sndout,
12331     struct mbuf **new_tail)
12332 {
12333         struct mbuf *m;
12334 
12335         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12336             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12337         if (m == NULL) {
12338                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12339                 *error = ENOBUFS;
12340         } else {
12341                 *sndout = m_length(m, NULL);
12342                 *new_tail = m_last(m);
12343         }
12344         return (m);
12345 }
12346 
12347 static int
12348 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12349     struct uio *uio,
12350     int resv_upfront)
12351 {
12352         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12353             resv_upfront, 0);
12354         if (sp->data == NULL) {
12355                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12356                 return (ENOBUFS);
12357         }
12358 
12359         sp->tail_mbuf = m_last(sp->data);
12360         return (0);
12361 }
12362 
12363 
12364 
12365 static struct sctp_stream_queue_pending *
12366 sctp_copy_it_in(struct sctp_tcb *stcb,
12367     struct sctp_association *asoc,
12368     struct sctp_sndrcvinfo *srcv,
12369     struct uio *uio,
12370     struct sctp_nets *net,
12371     int max_send_len,
12372     int user_marks_eor,
12373     int *error)
12374 {
12375 
12376         /*-
12377          * This routine must be very careful in its work. Protocol
12378          * processing is up and running so care must be taken to spl...()
12379          * when you need to do something that may effect the stcb/asoc. The
12380          * sb is locked however. When data is copied the protocol processing
12381          * should be enabled since this is a slower operation...
12382          */
12383         struct sctp_stream_queue_pending *sp = NULL;
12384         int resv_in_first;
12385 
12386         *error = 0;
12387         /* Now can we send this? */
12388         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12389             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12390             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12391             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12392                 /* got data while shutting down */
12393                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12394                 *error = ECONNRESET;
12395                 goto out_now;
12396         }
12397         sctp_alloc_a_strmoq(stcb, sp);
12398         if (sp == NULL) {
12399                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12400                 *error = ENOMEM;
12401                 goto out_now;
12402         }
12403         sp->act_flags = 0;
12404         sp->sender_all_done = 0;
12405         sp->sinfo_flags = srcv->sinfo_flags;
12406         sp->timetolive = srcv->sinfo_timetolive;
12407         sp->ppid = srcv->sinfo_ppid;
12408         sp->context = srcv->sinfo_context;
12409         sp->fsn = 0;
12410         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12411 
12412         sp->sid = srcv->sinfo_stream;
12413         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12414         if ((sp->length == (uint32_t)uio->uio_resid) &&
12415             ((user_marks_eor == 0) ||
12416             (srcv->sinfo_flags & SCTP_EOF) ||
12417             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12418                 sp->msg_is_complete = 1;
12419         } else {
12420                 sp->msg_is_complete = 0;
12421         }
12422         sp->sender_all_done = 0;
12423         sp->some_taken = 0;
12424         sp->put_last_out = 0;
12425         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12426         sp->data = sp->tail_mbuf = NULL;
12427         if (sp->length == 0) {
12428                 goto skip_copy;
12429         }
12430         if (srcv->sinfo_keynumber_valid) {
12431                 sp->auth_keyid = srcv->sinfo_keynumber;
12432         } else {
12433                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12434         }
12435         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12436                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12437                 sp->holds_key_ref = 1;
12438         }
12439         *error = sctp_copy_one(sp, uio, resv_in_first);
12440 skip_copy:
12441         if (*error) {
12442                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12443                 sp = NULL;
12444         } else {
12445                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12446                         sp->net = net;
12447                         atomic_add_int(&sp->net->ref_count, 1);
12448                 } else {
12449                         sp->net = NULL;
12450                 }
12451                 sctp_set_prsctp_policy(sp);
12452         }
12453 out_now:
12454         return (sp);
12455 }
12456 
12457 
12458 int
12459 sctp_sosend(struct socket *so,
12460     struct sockaddr *addr,
12461     struct uio *uio,
12462     struct mbuf *top,
12463     struct mbuf *control,
12464     int flags,
12465     struct thread *p
12466 )
12467 {
12468         int error, use_sndinfo = 0;
12469         struct sctp_sndrcvinfo sndrcvninfo;
12470         struct sockaddr *addr_to_use;
12471 #if defined(INET) && defined(INET6)
12472         struct sockaddr_in sin;
12473 #endif
12474 
12475         if (control) {
12476                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12477                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12478                     sizeof(sndrcvninfo))) {
12479                         /* got one */
12480                         use_sndinfo = 1;
12481                 }
12482         }
12483         addr_to_use = addr;
12484 #if defined(INET) && defined(INET6)
12485         if ((addr) && (addr->sa_family == AF_INET6)) {
12486                 struct sockaddr_in6 *sin6;
12487 
12488                 sin6 = (struct sockaddr_in6 *)addr;
12489                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12490                         in6_sin6_2_sin(&sin, sin6);
12491                         addr_to_use = (struct sockaddr *)&sin;
12492                 }
12493         }
12494 #endif
12495         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12496             control,
12497             flags,
12498             use_sndinfo ? &sndrcvninfo : NULL
12499             ,p
12500             );
12501         return (error);
12502 }
12503 
12504 
12505 int
12506 sctp_lower_sosend(struct socket *so,
12507     struct sockaddr *addr,
12508     struct uio *uio,
12509     struct mbuf *i_pak,
12510     struct mbuf *control,
12511     int flags,
12512     struct sctp_sndrcvinfo *srcv
12513     ,
12514     struct thread *p
12515 )
12516 {
12517         unsigned int sndlen = 0, max_len;
12518         int error, len;
12519         struct mbuf *top = NULL;
12520         int queue_only = 0, queue_only_for_init = 0;
12521         int free_cnt_applied = 0;
12522         int un_sent;
12523         int now_filled = 0;
12524         unsigned int inqueue_bytes = 0;
12525         struct sctp_block_entry be;
12526         struct sctp_inpcb *inp;
12527         struct sctp_tcb *stcb = NULL;
12528         struct timeval now;
12529         struct sctp_nets *net;
12530         struct sctp_association *asoc;
12531         struct sctp_inpcb *t_inp;
12532         int user_marks_eor;
12533         int create_lock_applied = 0;
12534         int nagle_applies = 0;
12535         int some_on_control = 0;
12536         int got_all_of_the_send = 0;
12537         int hold_tcblock = 0;
12538         int non_blocking = 0;
12539         uint32_t local_add_more, local_soresv = 0;
12540         uint16_t port;
12541         uint16_t sinfo_flags;
12542         sctp_assoc_t sinfo_assoc_id;
12543 
12544         error = 0;
12545         net = NULL;
12546         stcb = NULL;
12547         asoc = NULL;
12548 
12549         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12550         if (inp == NULL) {
12551                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12552                 error = EINVAL;
12553                 if (i_pak) {
12554                         SCTP_RELEASE_PKT(i_pak);
12555                 }
12556                 return (error);
12557         }
12558         if ((uio == NULL) && (i_pak == NULL)) {
12559                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12560                 return (EINVAL);
12561         }
12562         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12563         atomic_add_int(&inp->total_sends, 1);
12564         if (uio) {
12565                 if (uio->uio_resid < 0) {
12566                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12567                         return (EINVAL);
12568                 }
12569                 sndlen = (unsigned int)uio->uio_resid;
12570         } else {
12571                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12572                 sndlen = SCTP_HEADER_LEN(i_pak);
12573         }
12574         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12575             (void *)addr,
12576             sndlen);
12577         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12578             SCTP_IS_LISTENING(inp)) {
12579                 /* The listener can NOT send */
12580                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12581                 error = ENOTCONN;
12582                 goto out_unlocked;
12583         }
12584         /**
12585          * Pre-screen address, if one is given the sin-len
12586          * must be set correctly!
12587          */
12588         if (addr) {
12589                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12590 
12591                 switch (raddr->sa.sa_family) {
12592 #ifdef INET
12593                 case AF_INET:
12594                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12595                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12596                                 error = EINVAL;
12597                                 goto out_unlocked;
12598                         }
12599                         port = raddr->sin.sin_port;
12600                         break;
12601 #endif
12602 #ifdef INET6
12603                 case AF_INET6:
12604                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12605                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                                 error = EINVAL;
12607                                 goto out_unlocked;
12608                         }
12609                         port = raddr->sin6.sin6_port;
12610                         break;
12611 #endif
12612                 default:
12613                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12614                         error = EAFNOSUPPORT;
12615                         goto out_unlocked;
12616                 }
12617         } else
12618                 port = 0;
12619 
12620         if (srcv) {
12621                 sinfo_flags = srcv->sinfo_flags;
12622                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12623                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12624                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12625                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12626                         error = EINVAL;
12627                         goto out_unlocked;
12628                 }
12629                 if (srcv->sinfo_flags)
12630                         SCTP_STAT_INCR(sctps_sends_with_flags);
12631         } else {
12632                 sinfo_flags = inp->def_send.sinfo_flags;
12633                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12634         }
12635         if (sinfo_flags & SCTP_SENDALL) {
12636                 /* its a sendall */
12637                 error = sctp_sendall(inp, uio, top, srcv);
12638                 top = NULL;
12639                 goto out_unlocked;
12640         }
12641         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12642                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12643                 error = EINVAL;
12644                 goto out_unlocked;
12645         }
12646         /* now we must find the assoc */
12647         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12648             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12649                 SCTP_INP_RLOCK(inp);
12650                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12651                 if (stcb) {
12652                         SCTP_TCB_LOCK(stcb);
12653                         hold_tcblock = 1;
12654                 }
12655                 SCTP_INP_RUNLOCK(inp);
12656         } else if (sinfo_assoc_id) {
12657                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12658                 if (stcb != NULL) {
12659                         hold_tcblock = 1;
12660                 }
12661         } else if (addr) {
12662                 /*-
12663                  * Since we did not use findep we must
12664                  * increment it, and if we don't find a tcb
12665                  * decrement it.
12666                  */
12667                 SCTP_INP_WLOCK(inp);
12668                 SCTP_INP_INCR_REF(inp);
12669                 SCTP_INP_WUNLOCK(inp);
12670                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12671                 if (stcb == NULL) {
12672                         SCTP_INP_WLOCK(inp);
12673                         SCTP_INP_DECR_REF(inp);
12674                         SCTP_INP_WUNLOCK(inp);
12675                 } else {
12676                         hold_tcblock = 1;
12677                 }
12678         }
12679         if ((stcb == NULL) && (addr)) {
12680                 /* Possible implicit send? */
12681                 SCTP_ASOC_CREATE_LOCK(inp);
12682                 create_lock_applied = 1;
12683                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12684                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12685                         /* Should I really unlock ? */
12686                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12687                         error = EINVAL;
12688                         goto out_unlocked;
12689 
12690                 }
12691                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12692                     (addr->sa_family == AF_INET6)) {
12693                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12694                         error = EINVAL;
12695                         goto out_unlocked;
12696                 }
12697                 SCTP_INP_WLOCK(inp);
12698                 SCTP_INP_INCR_REF(inp);
12699                 SCTP_INP_WUNLOCK(inp);
12700                 /* With the lock applied look again */
12701                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12702                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12703                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12704                 }
12705                 if (stcb == NULL) {
12706                         SCTP_INP_WLOCK(inp);
12707                         SCTP_INP_DECR_REF(inp);
12708                         SCTP_INP_WUNLOCK(inp);
12709                 } else {
12710                         hold_tcblock = 1;
12711                 }
12712                 if (error) {
12713                         goto out_unlocked;
12714                 }
12715                 if (t_inp != inp) {
12716                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12717                         error = ENOTCONN;
12718                         goto out_unlocked;
12719                 }
12720         }
12721         if (stcb == NULL) {
12722                 if (addr == NULL) {
12723                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12724                         error = ENOENT;
12725                         goto out_unlocked;
12726                 } else {
12727                         /* We must go ahead and start the INIT process */
12728                         uint32_t vrf_id;
12729 
12730                         if ((sinfo_flags & SCTP_ABORT) ||
12731                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12732                                 /*-
12733                                  * User asks to abort a non-existant assoc,
12734                                  * or EOF a non-existant assoc with no data
12735                                  */
12736                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12737                                 error = ENOENT;
12738                                 goto out_unlocked;
12739                         }
12740                         /* get an asoc/stcb struct */
12741                         vrf_id = inp->def_vrf_id;
12742 #ifdef INVARIANTS
12743                         if (create_lock_applied == 0) {
12744                                 panic("Error, should hold create lock and I don't?");
12745                         }
12746 #endif
12747                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12748                             inp->sctp_ep.pre_open_stream_count,
12749                             inp->sctp_ep.port,
12750                             p);
12751                         if (stcb == NULL) {
12752                                 /* Error is setup for us in the call */
12753                                 goto out_unlocked;
12754                         }
12755                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12756                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12757                                 /*
12758                                  * Set the connected flag so we can queue
12759                                  * data
12760                                  */
12761                                 soisconnecting(so);
12762                         }
12763                         hold_tcblock = 1;
12764                         if (create_lock_applied) {
12765                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12766                                 create_lock_applied = 0;
12767                         } else {
12768                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12769                         }
12770                         /*
12771                          * Turn on queue only flag to prevent data from
12772                          * being sent
12773                          */
12774                         queue_only = 1;
12775                         asoc = &stcb->asoc;
12776                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12777                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12778 
12779                         /* initialize authentication params for the assoc */
12780                         sctp_initialize_auth_params(inp, stcb);
12781 
12782                         if (control) {
12783                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12784                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12785                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12786                                         hold_tcblock = 0;
12787                                         stcb = NULL;
12788                                         goto out_unlocked;
12789                                 }
12790                         }
12791                         /* out with the INIT */
12792                         queue_only_for_init = 1;
12793                         /*-
12794                          * we may want to dig in after this call and adjust the MTU
12795                          * value. It defaulted to 1500 (constant) but the ro
12796                          * structure may now have an update and thus we may need to
12797                          * change it BEFORE we append the message.
12798                          */
12799                 }
12800         } else
12801                 asoc = &stcb->asoc;
12802         if (srcv == NULL)
12803                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12804         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12805                 if (addr)
12806                         net = sctp_findnet(stcb, addr);
12807                 else
12808                         net = NULL;
12809                 if ((net == NULL) ||
12810                     ((port != 0) && (port != stcb->rport))) {
12811                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12812                         error = EINVAL;
12813                         goto out_unlocked;
12814                 }
12815         } else {
12816                 if (stcb->asoc.alternate) {
12817                         net = stcb->asoc.alternate;
12818                 } else {
12819                         net = stcb->asoc.primary_destination;
12820                 }
12821         }
12822         atomic_add_int(&stcb->total_sends, 1);
12823         /* Keep the stcb from being freed under our feet */
12824         atomic_add_int(&asoc->refcnt, 1);
12825         free_cnt_applied = 1;
12826 
12827         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12828                 if (sndlen > asoc->smallest_mtu) {
12829                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12830                         error = EMSGSIZE;
12831                         goto out_unlocked;
12832                 }
12833         }
12834         if (SCTP_SO_IS_NBIO(so)
12835             || (flags & MSG_NBIO)
12836             ) {
12837                 non_blocking = 1;
12838         }
12839         /* would we block? */
12840         if (non_blocking) {
12841                 uint32_t amount;
12842 
12843                 if (hold_tcblock == 0) {
12844                         SCTP_TCB_LOCK(stcb);
12845                         hold_tcblock = 1;
12846                 }
12847                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12848                 if (user_marks_eor == 0) {
12849                         amount = sndlen;
12850                 } else {
12851                         amount = 1;
12852                 }
12853                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12854                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12855                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12856                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12857                                 error = EMSGSIZE;
12858                         else
12859                                 error = EWOULDBLOCK;
12860                         goto out_unlocked;
12861                 }
12862                 stcb->asoc.sb_send_resv += sndlen;
12863                 SCTP_TCB_UNLOCK(stcb);
12864                 hold_tcblock = 0;
12865         } else {
12866                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12867         }
12868         local_soresv = sndlen;
12869         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12870                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12871                 error = ECONNRESET;
12872                 goto out_unlocked;
12873         }
12874         if (create_lock_applied) {
12875                 SCTP_ASOC_CREATE_UNLOCK(inp);
12876                 create_lock_applied = 0;
12877         }
12878         /* Is the stream no. valid? */
12879         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12880                 /* Invalid stream number */
12881                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12882                 error = EINVAL;
12883                 goto out_unlocked;
12884         }
12885         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12886             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12887                 /*
12888                  * Can't queue any data while stream reset is underway.
12889                  */
12890                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12891                         error = EAGAIN;
12892                 } else {
12893                         error = EINVAL;
12894                 }
12895                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12896                 goto out_unlocked;
12897         }
12898         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12899             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12900                 queue_only = 1;
12901         }
12902         /* we are now done with all control */
12903         if (control) {
12904                 sctp_m_freem(control);
12905                 control = NULL;
12906         }
12907         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
12908             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12909             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12910             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12911                 if (srcv->sinfo_flags & SCTP_ABORT) {
12912                         ;
12913                 } else {
12914                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12915                         error = ECONNRESET;
12916                         goto out_unlocked;
12917                 }
12918         }
12919         /* Ok, we will attempt a msgsnd :> */
12920         if (p) {
12921                 p->td_ru.ru_msgsnd++;
12922         }
12923         /* Are we aborting? */
12924         if (srcv->sinfo_flags & SCTP_ABORT) {
12925                 struct mbuf *mm;
12926                 int tot_demand, tot_out = 0, max_out;
12927 
12928                 SCTP_STAT_INCR(sctps_sends_with_abort);
12929                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12930                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12931                         /* It has to be up before we abort */
12932                         /* how big is the user initiated abort? */
12933                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12934                         error = EINVAL;
12935                         goto out;
12936                 }
12937                 if (hold_tcblock) {
12938                         SCTP_TCB_UNLOCK(stcb);
12939                         hold_tcblock = 0;
12940                 }
12941                 if (top) {
12942                         struct mbuf *cntm = NULL;
12943 
12944                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12945                         if (sndlen != 0) {
12946                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12947                                         tot_out += SCTP_BUF_LEN(cntm);
12948                                 }
12949                         }
12950                 } else {
12951                         /* Must fit in a MTU */
12952                         tot_out = sndlen;
12953                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12954                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12955                                 /* To big */
12956                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12957                                 error = EMSGSIZE;
12958                                 goto out;
12959                         }
12960                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12961                 }
12962                 if (mm == NULL) {
12963                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12964                         error = ENOMEM;
12965                         goto out;
12966                 }
12967                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12968                 max_out -= sizeof(struct sctp_abort_msg);
12969                 if (tot_out > max_out) {
12970                         tot_out = max_out;
12971                 }
12972                 if (mm) {
12973                         struct sctp_paramhdr *ph;
12974 
12975                         /* now move forward the data pointer */
12976                         ph = mtod(mm, struct sctp_paramhdr *);
12977                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12978                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12979                         ph++;
12980                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12981                         if (top == NULL) {
12982                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12983                                 if (error) {
12984                                         /*-
12985                                          * Here if we can't get his data we
12986                                          * still abort we just don't get to
12987                                          * send the users note :-0
12988                                          */
12989                                         sctp_m_freem(mm);
12990                                         mm = NULL;
12991                                 }
12992                         } else {
12993                                 if (sndlen != 0) {
12994                                         SCTP_BUF_NEXT(mm) = top;
12995                                 }
12996                         }
12997                 }
12998                 if (hold_tcblock == 0) {
12999                         SCTP_TCB_LOCK(stcb);
13000                 }
13001                 atomic_add_int(&stcb->asoc.refcnt, -1);
13002                 free_cnt_applied = 0;
13003                 /* release this lock, otherwise we hang on ourselves */
13004                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13005                 /* now relock the stcb so everything is sane */
13006                 hold_tcblock = 0;
13007                 stcb = NULL;
13008                 /*
13009                  * In this case top is already chained to mm avoid double
13010                  * free, since we free it below if top != NULL and driver
13011                  * would free it after sending the packet out
13012                  */
13013                 if (sndlen != 0) {
13014                         top = NULL;
13015                 }
13016                 goto out_unlocked;
13017         }
13018         /* Calculate the maximum we can send */
13019         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13020         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13021                 if (non_blocking) {
13022                         /* we already checked for non-blocking above. */
13023                         max_len = sndlen;
13024                 } else {
13025                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13026                 }
13027         } else {
13028                 max_len = 0;
13029         }
13030         if (hold_tcblock) {
13031                 SCTP_TCB_UNLOCK(stcb);
13032                 hold_tcblock = 0;
13033         }
13034         if (asoc->strmout == NULL) {
13035                 /* huh? software error */
13036                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13037                 error = EFAULT;
13038                 goto out_unlocked;
13039         }
13040 
13041         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13042         if ((user_marks_eor == 0) &&
13043             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13044                 /* It will NEVER fit */
13045                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13046                 error = EMSGSIZE;
13047                 goto out_unlocked;
13048         }
13049         if ((uio == NULL) && user_marks_eor) {
13050                 /*-
13051                  * We do not support eeor mode for
13052                  * sending with mbuf chains (like sendfile).
13053                  */
13054                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13055                 error = EINVAL;
13056                 goto out_unlocked;
13057         }
13058 
13059         if (user_marks_eor) {
13060                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13061         } else {
13062                 /*-
13063                  * For non-eeor the whole message must fit in
13064                  * the socket send buffer.
13065                  */
13066                 local_add_more = sndlen;
13067         }
13068         len = 0;
13069         if (non_blocking) {
13070                 goto skip_preblock;
13071         }
13072         if (((max_len <= local_add_more) &&
13073             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13074             (max_len == 0) ||
13075             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13076                 /* No room right now ! */
13077                 SOCKBUF_LOCK(&so->so_snd);
13078                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13079                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13080                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13081                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13082                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13083                             inqueue_bytes,
13084                             local_add_more,
13085                             stcb->asoc.stream_queue_cnt,
13086                             stcb->asoc.chunks_on_out_queue,
13087                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13088                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13089                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13090                         }
13091                         be.error = 0;
13092                         stcb->block_entry = &be;
13093                         error = sbwait(&so->so_snd);
13094                         stcb->block_entry = NULL;
13095                         if (error || so->so_error || be.error) {
13096                                 if (error == 0) {
13097                                         if (so->so_error)
13098                                                 error = so->so_error;
13099                                         if (be.error) {
13100                                                 error = be.error;
13101                                         }
13102                                 }
13103                                 SOCKBUF_UNLOCK(&so->so_snd);
13104                                 goto out_unlocked;
13105                         }
13106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13108                                     asoc, stcb->asoc.total_output_queue_size);
13109                         }
13110                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13111                                 SOCKBUF_UNLOCK(&so->so_snd);
13112                                 goto out_unlocked;
13113                         }
13114                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13115                 }
13116                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13117                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13118                 } else {
13119                         max_len = 0;
13120                 }
13121                 SOCKBUF_UNLOCK(&so->so_snd);
13122         }
13123 
13124 skip_preblock:
13125         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13126                 goto out_unlocked;
13127         }
13128         /*
13129          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13130          * case NOTE: uio will be null when top/mbuf is passed
13131          */
13132         if (sndlen == 0) {
13133                 if (srcv->sinfo_flags & SCTP_EOF) {
13134                         got_all_of_the_send = 1;
13135                         goto dataless_eof;
13136                 } else {
13137                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13138                         error = EINVAL;
13139                         goto out;
13140                 }
13141         }
13142         if (top == NULL) {
13143                 struct sctp_stream_queue_pending *sp;
13144                 struct sctp_stream_out *strm;
13145                 uint32_t sndout;
13146 
13147                 SCTP_TCB_SEND_LOCK(stcb);
13148                 if ((asoc->stream_locked) &&
13149                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13150                         SCTP_TCB_SEND_UNLOCK(stcb);
13151                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13152                         error = EINVAL;
13153                         goto out;
13154                 }
13155                 SCTP_TCB_SEND_UNLOCK(stcb);
13156 
13157                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13158                 if (strm->last_msg_incomplete == 0) {
13159         do_a_copy_in:
13160                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13161                         if (error) {
13162                                 goto out;
13163                         }
13164                         SCTP_TCB_SEND_LOCK(stcb);
13165                         if (sp->msg_is_complete) {
13166                                 strm->last_msg_incomplete = 0;
13167                                 asoc->stream_locked = 0;
13168                         } else {
13169                                 /*
13170                                  * Just got locked to this guy in case of an
13171                                  * interrupt.
13172                                  */
13173                                 strm->last_msg_incomplete = 1;
13174                                 if (stcb->asoc.idata_supported == 0) {
13175                                         asoc->stream_locked = 1;
13176                                         asoc->stream_locked_on = srcv->sinfo_stream;
13177                                 }
13178                                 sp->sender_all_done = 0;
13179                         }
13180                         sctp_snd_sb_alloc(stcb, sp->length);
13181                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13182                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13183                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13184                         }
13185                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13186                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13187                         SCTP_TCB_SEND_UNLOCK(stcb);
13188                 } else {
13189                         SCTP_TCB_SEND_LOCK(stcb);
13190                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13191                         SCTP_TCB_SEND_UNLOCK(stcb);
13192                         if (sp == NULL) {
13193                                 /* ???? Huh ??? last msg is gone */
13194 #ifdef INVARIANTS
13195                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13196 #else
13197                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13198                                 strm->last_msg_incomplete = 0;
13199 #endif
13200                                 goto do_a_copy_in;
13201 
13202                         }
13203                 }
13204                 while (uio->uio_resid > 0) {
13205                         /* How much room do we have? */
13206                         struct mbuf *new_tail, *mm;
13207 
13208                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13209                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13210                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13211                         else
13212                                 max_len = 0;
13213 
13214                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13215                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13216                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13217                                 sndout = 0;
13218                                 new_tail = NULL;
13219                                 if (hold_tcblock) {
13220                                         SCTP_TCB_UNLOCK(stcb);
13221                                         hold_tcblock = 0;
13222                                 }
13223                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13224                                 if ((mm == NULL) || error) {
13225                                         if (mm) {
13226                                                 sctp_m_freem(mm);
13227                                         }
13228                                         goto out;
13229                                 }
13230                                 /* Update the mbuf and count */
13231                                 SCTP_TCB_SEND_LOCK(stcb);
13232                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13233                                         /*
13234                                          * we need to get out. Peer probably
13235                                          * aborted.
13236                                          */
13237                                         sctp_m_freem(mm);
13238                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13239                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13240                                                 error = ECONNRESET;
13241                                         }
13242                                         SCTP_TCB_SEND_UNLOCK(stcb);
13243                                         goto out;
13244                                 }
13245                                 if (sp->tail_mbuf) {
13246                                         /* tack it to the end */
13247                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13248                                         sp->tail_mbuf = new_tail;
13249                                 } else {
13250                                         /* A stolen mbuf */
13251                                         sp->data = mm;
13252                                         sp->tail_mbuf = new_tail;
13253                                 }
13254                                 sctp_snd_sb_alloc(stcb, sndout);
13255                                 atomic_add_int(&sp->length, sndout);
13256                                 len += sndout;
13257                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13258                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13259                                 }
13260 
13261                                 /* Did we reach EOR? */
13262                                 if ((uio->uio_resid == 0) &&
13263                                     ((user_marks_eor == 0) ||
13264                                     (srcv->sinfo_flags & SCTP_EOF) ||
13265                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13266                                         sp->msg_is_complete = 1;
13267                                 } else {
13268                                         sp->msg_is_complete = 0;
13269                                 }
13270                                 SCTP_TCB_SEND_UNLOCK(stcb);
13271                         }
13272                         if (uio->uio_resid == 0) {
13273                                 /* got it all? */
13274                                 continue;
13275                         }
13276                         /* PR-SCTP? */
13277                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13278                                 /*
13279                                  * This is ugly but we must assure locking
13280                                  * order
13281                                  */
13282                                 if (hold_tcblock == 0) {
13283                                         SCTP_TCB_LOCK(stcb);
13284                                         hold_tcblock = 1;
13285                                 }
13286                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13287                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13288                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13289                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13290                                 else
13291                                         max_len = 0;
13292                                 if (max_len > 0) {
13293                                         continue;
13294                                 }
13295                                 SCTP_TCB_UNLOCK(stcb);
13296                                 hold_tcblock = 0;
13297                         }
13298                         /* wait for space now */
13299                         if (non_blocking) {
13300                                 /* Non-blocking io in place out */
13301                                 goto skip_out_eof;
13302                         }
13303                         /* What about the INIT, send it maybe */
13304                         if (queue_only_for_init) {
13305                                 if (hold_tcblock == 0) {
13306                                         SCTP_TCB_LOCK(stcb);
13307                                         hold_tcblock = 1;
13308                                 }
13309                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13310                                         /* a collision took us forward? */
13311                                         queue_only = 0;
13312                                 } else {
13313                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13314                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13315                                         queue_only = 1;
13316                                 }
13317                         }
13318                         if ((net->flight_size > net->cwnd) &&
13319                             (asoc->sctp_cmt_on_off == 0)) {
13320                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13321                                 queue_only = 1;
13322                         } else if (asoc->ifp_had_enobuf) {
13323                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13324                                 if (net->flight_size > (2 * net->mtu)) {
13325                                         queue_only = 1;
13326                                 }
13327                                 asoc->ifp_had_enobuf = 0;
13328                         }
13329                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13330                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13331                             (stcb->asoc.total_flight > 0) &&
13332                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13333                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13334 
13335                                 /*-
13336                                  * Ok, Nagle is set on and we have data outstanding.
13337                                  * Don't send anything and let SACKs drive out the
13338                                  * data unless we have a "full" segment to send.
13339                                  */
13340                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13341                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13342                                 }
13343                                 SCTP_STAT_INCR(sctps_naglequeued);
13344                                 nagle_applies = 1;
13345                         } else {
13346                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13347                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13348                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13349                                 }
13350                                 SCTP_STAT_INCR(sctps_naglesent);
13351                                 nagle_applies = 0;
13352                         }
13353                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13354 
13355                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13356                                     nagle_applies, un_sent);
13357                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13358                                     stcb->asoc.total_flight,
13359                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13360                         }
13361                         if (queue_only_for_init)
13362                                 queue_only_for_init = 0;
13363                         if ((queue_only == 0) && (nagle_applies == 0)) {
13364                                 /*-
13365                                  * need to start chunk output
13366                                  * before blocking.. note that if
13367                                  * a lock is already applied, then
13368                                  * the input via the net is happening
13369                                  * and I don't need to start output :-D
13370                                  */
13371                                 if (hold_tcblock == 0) {
13372                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13373                                                 hold_tcblock = 1;
13374                                                 sctp_chunk_output(inp,
13375                                                     stcb,
13376                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13377                                         }
13378                                 } else {
13379                                         sctp_chunk_output(inp,
13380                                             stcb,
13381                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13382                                 }
13383                                 if (hold_tcblock == 1) {
13384                                         SCTP_TCB_UNLOCK(stcb);
13385                                         hold_tcblock = 0;
13386                                 }
13387                         }
13388                         SOCKBUF_LOCK(&so->so_snd);
13389                         /*-
13390                          * This is a bit strange, but I think it will
13391                          * work. The total_output_queue_size is locked and
13392                          * protected by the TCB_LOCK, which we just released.
13393                          * There is a race that can occur between releasing it
13394                          * above, and me getting the socket lock, where sacks
13395                          * come in but we have not put the SB_WAIT on the
13396                          * so_snd buffer to get the wakeup. After the LOCK
13397                          * is applied the sack_processing will also need to
13398                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13399                          * once we have the socket buffer lock if we recheck the
13400                          * size we KNOW we will get to sleep safely with the
13401                          * wakeup flag in place.
13402                          */
13403                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13404                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13405                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13406                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13407                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13408                                             asoc, (size_t)uio->uio_resid);
13409                                 }
13410                                 be.error = 0;
13411                                 stcb->block_entry = &be;
13412                                 error = sbwait(&so->so_snd);
13413                                 stcb->block_entry = NULL;
13414 
13415                                 if (error || so->so_error || be.error) {
13416                                         if (error == 0) {
13417                                                 if (so->so_error)
13418                                                         error = so->so_error;
13419                                                 if (be.error) {
13420                                                         error = be.error;
13421                                                 }
13422                                         }
13423                                         SOCKBUF_UNLOCK(&so->so_snd);
13424                                         goto out_unlocked;
13425                                 }
13426 
13427                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13428                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13429                                             asoc, stcb->asoc.total_output_queue_size);
13430                                 }
13431                         }
13432                         SOCKBUF_UNLOCK(&so->so_snd);
13433                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13434                                 goto out_unlocked;
13435                         }
13436                 }
13437                 SCTP_TCB_SEND_LOCK(stcb);
13438                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13439                         SCTP_TCB_SEND_UNLOCK(stcb);
13440                         goto out_unlocked;
13441                 }
13442                 if (sp) {
13443                         if (sp->msg_is_complete == 0) {
13444                                 strm->last_msg_incomplete = 1;
13445                                 if (stcb->asoc.idata_supported == 0) {
13446                                         asoc->stream_locked = 1;
13447                                         asoc->stream_locked_on = srcv->sinfo_stream;
13448                                 }
13449                         } else {
13450                                 sp->sender_all_done = 1;
13451                                 strm->last_msg_incomplete = 0;
13452                                 asoc->stream_locked = 0;
13453                         }
13454                 } else {
13455                         SCTP_PRINTF("Huh no sp TSNH?\n");
13456                         strm->last_msg_incomplete = 0;
13457                         asoc->stream_locked = 0;
13458                 }
13459                 SCTP_TCB_SEND_UNLOCK(stcb);
13460                 if (uio->uio_resid == 0) {
13461                         got_all_of_the_send = 1;
13462                 }
13463         } else {
13464                 /* We send in a 0, since we do NOT have any locks */
13465                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13466                 top = NULL;
13467                 if (srcv->sinfo_flags & SCTP_EOF) {
13468                         /*
13469                          * This should only happen for Panda for the mbuf
13470                          * send case, which does NOT yet support EEOR mode.
13471                          * Thus, we can just set this flag to do the proper
13472                          * EOF handling.
13473                          */
13474                         got_all_of_the_send = 1;
13475                 }
13476         }
13477         if (error) {
13478                 goto out;
13479         }
13480 dataless_eof:
13481         /* EOF thing ? */
13482         if ((srcv->sinfo_flags & SCTP_EOF) &&
13483             (got_all_of_the_send == 1)) {
13484                 SCTP_STAT_INCR(sctps_sends_with_eof);
13485                 error = 0;
13486                 if (hold_tcblock == 0) {
13487                         SCTP_TCB_LOCK(stcb);
13488                         hold_tcblock = 1;
13489                 }
13490                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13491                     TAILQ_EMPTY(&asoc->sent_queue) &&
13492                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13493                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13494                                 goto abort_anyway;
13495                         }
13496                         /* there is nothing queued to send, so I'm done... */
13497                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13498                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13499                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13500                                 struct sctp_nets *netp;
13501 
13502                                 /* only send SHUTDOWN the first time through */
13503                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13504                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13505                                 }
13506                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13507                                 sctp_stop_timers_for_shutdown(stcb);
13508                                 if (stcb->asoc.alternate) {
13509                                         netp = stcb->asoc.alternate;
13510                                 } else {
13511                                         netp = stcb->asoc.primary_destination;
13512                                 }
13513                                 sctp_send_shutdown(stcb, netp);
13514                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13515                                     netp);
13516                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13517                                     asoc->primary_destination);
13518                         }
13519                 } else {
13520                         /*-
13521                          * we still got (or just got) data to send, so set
13522                          * SHUTDOWN_PENDING
13523                          */
13524                         /*-
13525                          * XXX sockets draft says that SCTP_EOF should be
13526                          * sent with no data.  currently, we will allow user
13527                          * data to be sent first and move to
13528                          * SHUTDOWN-PENDING
13529                          */
13530                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13531                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13532                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13533                                 if (hold_tcblock == 0) {
13534                                         SCTP_TCB_LOCK(stcb);
13535                                         hold_tcblock = 1;
13536                                 }
13537                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13538                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13539                                 }
13540                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13541                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13542                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13543                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13544                                         struct mbuf *op_err;
13545                                         char msg[SCTP_DIAG_INFO_LEN];
13546 
13547                         abort_anyway:
13548                                         if (free_cnt_applied) {
13549                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13550                                                 free_cnt_applied = 0;
13551                                         }
13552                                         snprintf(msg, sizeof(msg),
13553                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13554                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13555                                             msg);
13556                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13557                                             op_err, SCTP_SO_LOCKED);
13558                                         /*
13559                                          * now relock the stcb so everything
13560                                          * is sane
13561                                          */
13562                                         hold_tcblock = 0;
13563                                         stcb = NULL;
13564                                         goto out;
13565                                 }
13566                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13567                                     asoc->primary_destination);
13568                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13569                         }
13570                 }
13571         }
13572 skip_out_eof:
13573         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13574                 some_on_control = 1;
13575         }
13576         if (queue_only_for_init) {
13577                 if (hold_tcblock == 0) {
13578                         SCTP_TCB_LOCK(stcb);
13579                         hold_tcblock = 1;
13580                 }
13581                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13582                         /* a collision took us forward? */
13583                         queue_only = 0;
13584                 } else {
13585                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13586                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13587                         queue_only = 1;
13588                 }
13589         }
13590         if ((net->flight_size > net->cwnd) &&
13591             (stcb->asoc.sctp_cmt_on_off == 0)) {
13592                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13593                 queue_only = 1;
13594         } else if (asoc->ifp_had_enobuf) {
13595                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13596                 if (net->flight_size > (2 * net->mtu)) {
13597                         queue_only = 1;
13598                 }
13599                 asoc->ifp_had_enobuf = 0;
13600         }
13601         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
13602         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13603             (stcb->asoc.total_flight > 0) &&
13604             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13605             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13606                 /*-
13607                  * Ok, Nagle is set on and we have data outstanding.
13608                  * Don't send anything and let SACKs drive out the
13609                  * data unless wen have a "full" segment to send.
13610                  */
13611                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13612                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13613                 }
13614                 SCTP_STAT_INCR(sctps_naglequeued);
13615                 nagle_applies = 1;
13616         } else {
13617                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13618                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13619                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13620                 }
13621                 SCTP_STAT_INCR(sctps_naglesent);
13622                 nagle_applies = 0;
13623         }
13624         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13625                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13626                     nagle_applies, un_sent);
13627                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13628                     stcb->asoc.total_flight,
13629                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13630         }
13631         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13632                 /* we can attempt to send too. */
13633                 if (hold_tcblock == 0) {
13634                         /*
13635                          * If there is activity recv'ing sacks no need to
13636                          * send
13637                          */
13638                         if (SCTP_TCB_TRYLOCK(stcb)) {
13639                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13640                                 hold_tcblock = 1;
13641                         }
13642                 } else {
13643                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13644                 }
13645         } else if ((queue_only == 0) &&
13646                     (stcb->asoc.peers_rwnd == 0) &&
13647             (stcb->asoc.total_flight == 0)) {
13648                 /* We get to have a probe outstanding */
13649                 if (hold_tcblock == 0) {
13650                         hold_tcblock = 1;
13651                         SCTP_TCB_LOCK(stcb);
13652                 }
13653                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13654         } else if (some_on_control) {
13655                 int num_out, reason, frag_point;
13656 
13657                 /* Here we do control only */
13658                 if (hold_tcblock == 0) {
13659                         hold_tcblock = 1;
13660                         SCTP_TCB_LOCK(stcb);
13661                 }
13662                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13663                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13664                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13665         }
13666         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13667             queue_only, stcb->asoc.peers_rwnd, un_sent,
13668             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13669             stcb->asoc.total_output_queue_size, error);
13670 
13671 out:
13672 out_unlocked:
13673 
13674         if (local_soresv && stcb) {
13675                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13676         }
13677         if (create_lock_applied) {
13678                 SCTP_ASOC_CREATE_UNLOCK(inp);
13679         }
13680         if ((stcb) && hold_tcblock) {
13681                 SCTP_TCB_UNLOCK(stcb);
13682         }
13683         if (stcb && free_cnt_applied) {
13684                 atomic_add_int(&stcb->asoc.refcnt, -1);
13685         }
13686 #ifdef INVARIANTS
13687         if (stcb) {
13688                 if (mtx_owned(&stcb->tcb_mtx)) {
13689                         panic("Leaving with tcb mtx owned?");
13690                 }
13691                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13692                         panic("Leaving with tcb send mtx owned?");
13693                 }
13694         }
13695 #endif
13696         if (top) {
13697                 sctp_m_freem(top);
13698         }
13699         if (control) {
13700                 sctp_m_freem(control);
13701         }
13702         return (error);
13703 }
13704 
13705 
13706 /*
13707  * generate an AUTHentication chunk, if required
13708  */
13709 struct mbuf *
13710 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13711     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13712     struct sctp_tcb *stcb, uint8_t chunk)
13713 {
13714         struct mbuf *m_auth;
13715         struct sctp_auth_chunk *auth;
13716         int chunk_len;
13717         struct mbuf *cn;
13718 
13719         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13720             (stcb == NULL))
13721                 return (m);
13722 
13723         if (stcb->asoc.auth_supported == 0) {
13724                 return (m);
13725         }
13726         /* does the requested chunk require auth? */
13727         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13728                 return (m);
13729         }
13730         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13731         if (m_auth == NULL) {
13732                 /* no mbuf's */
13733                 return (m);
13734         }
13735         /* reserve some space if this will be the first mbuf */
13736         if (m == NULL)
13737                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13738         /* fill in the AUTH chunk details */
13739         auth = mtod(m_auth, struct sctp_auth_chunk *);
13740         memset(auth, 0, sizeof(*auth));
13741         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13742         auth->ch.chunk_flags = 0;
13743         chunk_len = sizeof(*auth) +
13744             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13745         auth->ch.chunk_length = htons(chunk_len);
13746         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13747         /* key id and hmac digest will be computed and filled in upon send */
13748 
13749         /* save the offset where the auth was inserted into the chain */
13750         *offset = 0;
13751         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13752                 *offset += SCTP_BUF_LEN(cn);
13753         }
13754 
13755         /* update length and return pointer to the auth chunk */
13756         SCTP_BUF_LEN(m_auth) = chunk_len;
13757         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13758         if (auth_ret != NULL)
13759                 *auth_ret = auth;
13760 
13761         return (m);
13762 }
13763 
13764 #ifdef INET6
13765 int
13766 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13767 {
13768         struct nd_prefix *pfx = NULL;
13769         struct nd_pfxrouter *pfxrtr = NULL;
13770         struct sockaddr_in6 gw6;
13771 
13772         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13773                 return (0);
13774 
13775         /* get prefix entry of address */
13776         ND6_RLOCK();
13777         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13778                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13779                         continue;
13780                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13781                     &src6->sin6_addr, &pfx->ndpr_mask))
13782                         break;
13783         }
13784         /* no prefix entry in the prefix list */
13785         if (pfx == NULL) {
13786                 ND6_RUNLOCK();
13787                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13788                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13789                 return (0);
13790         }
13791 
13792         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13793         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13794 
13795         /* search installed gateway from prefix entry */
13796         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13797                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13798                 gw6.sin6_family = AF_INET6;
13799                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13800                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13801                     sizeof(struct in6_addr));
13802                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13803                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13804                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13805                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13806                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13807                         ND6_RUNLOCK();
13808                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13809                         return (1);
13810                 }
13811         }
13812         ND6_RUNLOCK();
13813         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13814         return (0);
13815 }
13816 #endif
13817 
13818 int
13819 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13820 {
13821 #ifdef INET
13822         struct sockaddr_in *sin, *mask;
13823         struct ifaddr *ifa;
13824         struct in_addr srcnetaddr, gwnetaddr;
13825 
13826         if (ro == NULL || ro->ro_rt == NULL ||
13827             sifa->address.sa.sa_family != AF_INET) {
13828                 return (0);
13829         }
13830         ifa = (struct ifaddr *)sifa->ifa;
13831         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13832         sin = &sifa->address.sin;
13833         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13834         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13835         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13836         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13837 
13838         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13839         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13840         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13841         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13842         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13843         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13844                 return (1);
13845         }
13846 #endif
13847         return (0);
13848 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_output.c

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