sctp_output.c

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.1/sys/netinet/sctp_output.c 320457 2017-06-28 21:08:21Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <sys/proc.h>
   38 #include <netinet/sctp_var.h>
   39 #include <netinet/sctp_sysctl.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_uio.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_bsd_addr.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp_crc32.h>
   53 #if defined(INET) || defined(INET6)
   54 #include <netinet/udp.h>
   55 #endif
   56 #include <netinet/udp_var.h>
   57 #include <machine/in_cksum.h>
   58 
   59 
   60 
   61 #define SCTP_MAX_GAPS_INARRAY 4
   62 struct sack_track {
   63         uint8_t right_edge;     /* mergable on the right edge */
   64         uint8_t left_edge;      /* mergable on the left edge */
   65         uint8_t num_entries;
   66         uint8_t spare;
   67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   68 };
   69 
   70 const struct sack_track sack_array[256] = {
   71         {0, 0, 0, 0,            /* 0x00 */
   72                 {{0, 0},
   73                 {0, 0},
   74                 {0, 0},
   75                 {0, 0}
   76                 }
   77         },
   78         {1, 0, 1, 0,            /* 0x01 */
   79                 {{0, 0},
   80                 {0, 0},
   81                 {0, 0},
   82                 {0, 0}
   83                 }
   84         },
   85         {0, 0, 1, 0,            /* 0x02 */
   86                 {{1, 1},
   87                 {0, 0},
   88                 {0, 0},
   89                 {0, 0}
   90                 }
   91         },
   92         {1, 0, 1, 0,            /* 0x03 */
   93                 {{0, 1},
   94                 {0, 0},
   95                 {0, 0},
   96                 {0, 0}
   97                 }
   98         },
   99         {0, 0, 1, 0,            /* 0x04 */
  100                 {{2, 2},
  101                 {0, 0},
  102                 {0, 0},
  103                 {0, 0}
  104                 }
  105         },
  106         {1, 0, 2, 0,            /* 0x05 */
  107                 {{0, 0},
  108                 {2, 2},
  109                 {0, 0},
  110                 {0, 0}
  111                 }
  112         },
  113         {0, 0, 1, 0,            /* 0x06 */
  114                 {{1, 2},
  115                 {0, 0},
  116                 {0, 0},
  117                 {0, 0}
  118                 }
  119         },
  120         {1, 0, 1, 0,            /* 0x07 */
  121                 {{0, 2},
  122                 {0, 0},
  123                 {0, 0},
  124                 {0, 0}
  125                 }
  126         },
  127         {0, 0, 1, 0,            /* 0x08 */
  128                 {{3, 3},
  129                 {0, 0},
  130                 {0, 0},
  131                 {0, 0}
  132                 }
  133         },
  134         {1, 0, 2, 0,            /* 0x09 */
  135                 {{0, 0},
  136                 {3, 3},
  137                 {0, 0},
  138                 {0, 0}
  139                 }
  140         },
  141         {0, 0, 2, 0,            /* 0x0a */
  142                 {{1, 1},
  143                 {3, 3},
  144                 {0, 0},
  145                 {0, 0}
  146                 }
  147         },
  148         {1, 0, 2, 0,            /* 0x0b */
  149                 {{0, 1},
  150                 {3, 3},
  151                 {0, 0},
  152                 {0, 0}
  153                 }
  154         },
  155         {0, 0, 1, 0,            /* 0x0c */
  156                 {{2, 3},
  157                 {0, 0},
  158                 {0, 0},
  159                 {0, 0}
  160                 }
  161         },
  162         {1, 0, 2, 0,            /* 0x0d */
  163                 {{0, 0},
  164                 {2, 3},
  165                 {0, 0},
  166                 {0, 0}
  167                 }
  168         },
  169         {0, 0, 1, 0,            /* 0x0e */
  170                 {{1, 3},
  171                 {0, 0},
  172                 {0, 0},
  173                 {0, 0}
  174                 }
  175         },
  176         {1, 0, 1, 0,            /* 0x0f */
  177                 {{0, 3},
  178                 {0, 0},
  179                 {0, 0},
  180                 {0, 0}
  181                 }
  182         },
  183         {0, 0, 1, 0,            /* 0x10 */
  184                 {{4, 4},
  185                 {0, 0},
  186                 {0, 0},
  187                 {0, 0}
  188                 }
  189         },
  190         {1, 0, 2, 0,            /* 0x11 */
  191                 {{0, 0},
  192                 {4, 4},
  193                 {0, 0},
  194                 {0, 0}
  195                 }
  196         },
  197         {0, 0, 2, 0,            /* 0x12 */
  198                 {{1, 1},
  199                 {4, 4},
  200                 {0, 0},
  201                 {0, 0}
  202                 }
  203         },
  204         {1, 0, 2, 0,            /* 0x13 */
  205                 {{0, 1},
  206                 {4, 4},
  207                 {0, 0},
  208                 {0, 0}
  209                 }
  210         },
  211         {0, 0, 2, 0,            /* 0x14 */
  212                 {{2, 2},
  213                 {4, 4},
  214                 {0, 0},
  215                 {0, 0}
  216                 }
  217         },
  218         {1, 0, 3, 0,            /* 0x15 */
  219                 {{0, 0},
  220                 {2, 2},
  221                 {4, 4},
  222                 {0, 0}
  223                 }
  224         },
  225         {0, 0, 2, 0,            /* 0x16 */
  226                 {{1, 2},
  227                 {4, 4},
  228                 {0, 0},
  229                 {0, 0}
  230                 }
  231         },
  232         {1, 0, 2, 0,            /* 0x17 */
  233                 {{0, 2},
  234                 {4, 4},
  235                 {0, 0},
  236                 {0, 0}
  237                 }
  238         },
  239         {0, 0, 1, 0,            /* 0x18 */
  240                 {{3, 4},
  241                 {0, 0},
  242                 {0, 0},
  243                 {0, 0}
  244                 }
  245         },
  246         {1, 0, 2, 0,            /* 0x19 */
  247                 {{0, 0},
  248                 {3, 4},
  249                 {0, 0},
  250                 {0, 0}
  251                 }
  252         },
  253         {0, 0, 2, 0,            /* 0x1a */
  254                 {{1, 1},
  255                 {3, 4},
  256                 {0, 0},
  257                 {0, 0}
  258                 }
  259         },
  260         {1, 0, 2, 0,            /* 0x1b */
  261                 {{0, 1},
  262                 {3, 4},
  263                 {0, 0},
  264                 {0, 0}
  265                 }
  266         },
  267         {0, 0, 1, 0,            /* 0x1c */
  268                 {{2, 4},
  269                 {0, 0},
  270                 {0, 0},
  271                 {0, 0}
  272                 }
  273         },
  274         {1, 0, 2, 0,            /* 0x1d */
  275                 {{0, 0},
  276                 {2, 4},
  277                 {0, 0},
  278                 {0, 0}
  279                 }
  280         },
  281         {0, 0, 1, 0,            /* 0x1e */
  282                 {{1, 4},
  283                 {0, 0},
  284                 {0, 0},
  285                 {0, 0}
  286                 }
  287         },
  288         {1, 0, 1, 0,            /* 0x1f */
  289                 {{0, 4},
  290                 {0, 0},
  291                 {0, 0},
  292                 {0, 0}
  293                 }
  294         },
  295         {0, 0, 1, 0,            /* 0x20 */
  296                 {{5, 5},
  297                 {0, 0},
  298                 {0, 0},
  299                 {0, 0}
  300                 }
  301         },
  302         {1, 0, 2, 0,            /* 0x21 */
  303                 {{0, 0},
  304                 {5, 5},
  305                 {0, 0},
  306                 {0, 0}
  307                 }
  308         },
  309         {0, 0, 2, 0,            /* 0x22 */
  310                 {{1, 1},
  311                 {5, 5},
  312                 {0, 0},
  313                 {0, 0}
  314                 }
  315         },
  316         {1, 0, 2, 0,            /* 0x23 */
  317                 {{0, 1},
  318                 {5, 5},
  319                 {0, 0},
  320                 {0, 0}
  321                 }
  322         },
  323         {0, 0, 2, 0,            /* 0x24 */
  324                 {{2, 2},
  325                 {5, 5},
  326                 {0, 0},
  327                 {0, 0}
  328                 }
  329         },
  330         {1, 0, 3, 0,            /* 0x25 */
  331                 {{0, 0},
  332                 {2, 2},
  333                 {5, 5},
  334                 {0, 0}
  335                 }
  336         },
  337         {0, 0, 2, 0,            /* 0x26 */
  338                 {{1, 2},
  339                 {5, 5},
  340                 {0, 0},
  341                 {0, 0}
  342                 }
  343         },
  344         {1, 0, 2, 0,            /* 0x27 */
  345                 {{0, 2},
  346                 {5, 5},
  347                 {0, 0},
  348                 {0, 0}
  349                 }
  350         },
  351         {0, 0, 2, 0,            /* 0x28 */
  352                 {{3, 3},
  353                 {5, 5},
  354                 {0, 0},
  355                 {0, 0}
  356                 }
  357         },
  358         {1, 0, 3, 0,            /* 0x29 */
  359                 {{0, 0},
  360                 {3, 3},
  361                 {5, 5},
  362                 {0, 0}
  363                 }
  364         },
  365         {0, 0, 3, 0,            /* 0x2a */
  366                 {{1, 1},
  367                 {3, 3},
  368                 {5, 5},
  369                 {0, 0}
  370                 }
  371         },
  372         {1, 0, 3, 0,            /* 0x2b */
  373                 {{0, 1},
  374                 {3, 3},
  375                 {5, 5},
  376                 {0, 0}
  377                 }
  378         },
  379         {0, 0, 2, 0,            /* 0x2c */
  380                 {{2, 3},
  381                 {5, 5},
  382                 {0, 0},
  383                 {0, 0}
  384                 }
  385         },
  386         {1, 0, 3, 0,            /* 0x2d */
  387                 {{0, 0},
  388                 {2, 3},
  389                 {5, 5},
  390                 {0, 0}
  391                 }
  392         },
  393         {0, 0, 2, 0,            /* 0x2e */
  394                 {{1, 3},
  395                 {5, 5},
  396                 {0, 0},
  397                 {0, 0}
  398                 }
  399         },
  400         {1, 0, 2, 0,            /* 0x2f */
  401                 {{0, 3},
  402                 {5, 5},
  403                 {0, 0},
  404                 {0, 0}
  405                 }
  406         },
  407         {0, 0, 1, 0,            /* 0x30 */
  408                 {{4, 5},
  409                 {0, 0},
  410                 {0, 0},
  411                 {0, 0}
  412                 }
  413         },
  414         {1, 0, 2, 0,            /* 0x31 */
  415                 {{0, 0},
  416                 {4, 5},
  417                 {0, 0},
  418                 {0, 0}
  419                 }
  420         },
  421         {0, 0, 2, 0,            /* 0x32 */
  422                 {{1, 1},
  423                 {4, 5},
  424                 {0, 0},
  425                 {0, 0}
  426                 }
  427         },
  428         {1, 0, 2, 0,            /* 0x33 */
  429                 {{0, 1},
  430                 {4, 5},
  431                 {0, 0},
  432                 {0, 0}
  433                 }
  434         },
  435         {0, 0, 2, 0,            /* 0x34 */
  436                 {{2, 2},
  437                 {4, 5},
  438                 {0, 0},
  439                 {0, 0}
  440                 }
  441         },
  442         {1, 0, 3, 0,            /* 0x35 */
  443                 {{0, 0},
  444                 {2, 2},
  445                 {4, 5},
  446                 {0, 0}
  447                 }
  448         },
  449         {0, 0, 2, 0,            /* 0x36 */
  450                 {{1, 2},
  451                 {4, 5},
  452                 {0, 0},
  453                 {0, 0}
  454                 }
  455         },
  456         {1, 0, 2, 0,            /* 0x37 */
  457                 {{0, 2},
  458                 {4, 5},
  459                 {0, 0},
  460                 {0, 0}
  461                 }
  462         },
  463         {0, 0, 1, 0,            /* 0x38 */
  464                 {{3, 5},
  465                 {0, 0},
  466                 {0, 0},
  467                 {0, 0}
  468                 }
  469         },
  470         {1, 0, 2, 0,            /* 0x39 */
  471                 {{0, 0},
  472                 {3, 5},
  473                 {0, 0},
  474                 {0, 0}
  475                 }
  476         },
  477         {0, 0, 2, 0,            /* 0x3a */
  478                 {{1, 1},
  479                 {3, 5},
  480                 {0, 0},
  481                 {0, 0}
  482                 }
  483         },
  484         {1, 0, 2, 0,            /* 0x3b */
  485                 {{0, 1},
  486                 {3, 5},
  487                 {0, 0},
  488                 {0, 0}
  489                 }
  490         },
  491         {0, 0, 1, 0,            /* 0x3c */
  492                 {{2, 5},
  493                 {0, 0},
  494                 {0, 0},
  495                 {0, 0}
  496                 }
  497         },
  498         {1, 0, 2, 0,            /* 0x3d */
  499                 {{0, 0},
  500                 {2, 5},
  501                 {0, 0},
  502                 {0, 0}
  503                 }
  504         },
  505         {0, 0, 1, 0,            /* 0x3e */
  506                 {{1, 5},
  507                 {0, 0},
  508                 {0, 0},
  509                 {0, 0}
  510                 }
  511         },
  512         {1, 0, 1, 0,            /* 0x3f */
  513                 {{0, 5},
  514                 {0, 0},
  515                 {0, 0},
  516                 {0, 0}
  517                 }
  518         },
  519         {0, 0, 1, 0,            /* 0x40 */
  520                 {{6, 6},
  521                 {0, 0},
  522                 {0, 0},
  523                 {0, 0}
  524                 }
  525         },
  526         {1, 0, 2, 0,            /* 0x41 */
  527                 {{0, 0},
  528                 {6, 6},
  529                 {0, 0},
  530                 {0, 0}
  531                 }
  532         },
  533         {0, 0, 2, 0,            /* 0x42 */
  534                 {{1, 1},
  535                 {6, 6},
  536                 {0, 0},
  537                 {0, 0}
  538                 }
  539         },
  540         {1, 0, 2, 0,            /* 0x43 */
  541                 {{0, 1},
  542                 {6, 6},
  543                 {0, 0},
  544                 {0, 0}
  545                 }
  546         },
  547         {0, 0, 2, 0,            /* 0x44 */
  548                 {{2, 2},
  549                 {6, 6},
  550                 {0, 0},
  551                 {0, 0}
  552                 }
  553         },
  554         {1, 0, 3, 0,            /* 0x45 */
  555                 {{0, 0},
  556                 {2, 2},
  557                 {6, 6},
  558                 {0, 0}
  559                 }
  560         },
  561         {0, 0, 2, 0,            /* 0x46 */
  562                 {{1, 2},
  563                 {6, 6},
  564                 {0, 0},
  565                 {0, 0}
  566                 }
  567         },
  568         {1, 0, 2, 0,            /* 0x47 */
  569                 {{0, 2},
  570                 {6, 6},
  571                 {0, 0},
  572                 {0, 0}
  573                 }
  574         },
  575         {0, 0, 2, 0,            /* 0x48 */
  576                 {{3, 3},
  577                 {6, 6},
  578                 {0, 0},
  579                 {0, 0}
  580                 }
  581         },
  582         {1, 0, 3, 0,            /* 0x49 */
  583                 {{0, 0},
  584                 {3, 3},
  585                 {6, 6},
  586                 {0, 0}
  587                 }
  588         },
  589         {0, 0, 3, 0,            /* 0x4a */
  590                 {{1, 1},
  591                 {3, 3},
  592                 {6, 6},
  593                 {0, 0}
  594                 }
  595         },
  596         {1, 0, 3, 0,            /* 0x4b */
  597                 {{0, 1},
  598                 {3, 3},
  599                 {6, 6},
  600                 {0, 0}
  601                 }
  602         },
  603         {0, 0, 2, 0,            /* 0x4c */
  604                 {{2, 3},
  605                 {6, 6},
  606                 {0, 0},
  607                 {0, 0}
  608                 }
  609         },
  610         {1, 0, 3, 0,            /* 0x4d */
  611                 {{0, 0},
  612                 {2, 3},
  613                 {6, 6},
  614                 {0, 0}
  615                 }
  616         },
  617         {0, 0, 2, 0,            /* 0x4e */
  618                 {{1, 3},
  619                 {6, 6},
  620                 {0, 0},
  621                 {0, 0}
  622                 }
  623         },
  624         {1, 0, 2, 0,            /* 0x4f */
  625                 {{0, 3},
  626                 {6, 6},
  627                 {0, 0},
  628                 {0, 0}
  629                 }
  630         },
  631         {0, 0, 2, 0,            /* 0x50 */
  632                 {{4, 4},
  633                 {6, 6},
  634                 {0, 0},
  635                 {0, 0}
  636                 }
  637         },
  638         {1, 0, 3, 0,            /* 0x51 */
  639                 {{0, 0},
  640                 {4, 4},
  641                 {6, 6},
  642                 {0, 0}
  643                 }
  644         },
  645         {0, 0, 3, 0,            /* 0x52 */
  646                 {{1, 1},
  647                 {4, 4},
  648                 {6, 6},
  649                 {0, 0}
  650                 }
  651         },
  652         {1, 0, 3, 0,            /* 0x53 */
  653                 {{0, 1},
  654                 {4, 4},
  655                 {6, 6},
  656                 {0, 0}
  657                 }
  658         },
  659         {0, 0, 3, 0,            /* 0x54 */
  660                 {{2, 2},
  661                 {4, 4},
  662                 {6, 6},
  663                 {0, 0}
  664                 }
  665         },
  666         {1, 0, 4, 0,            /* 0x55 */
  667                 {{0, 0},
  668                 {2, 2},
  669                 {4, 4},
  670                 {6, 6}
  671                 }
  672         },
  673         {0, 0, 3, 0,            /* 0x56 */
  674                 {{1, 2},
  675                 {4, 4},
  676                 {6, 6},
  677                 {0, 0}
  678                 }
  679         },
  680         {1, 0, 3, 0,            /* 0x57 */
  681                 {{0, 2},
  682                 {4, 4},
  683                 {6, 6},
  684                 {0, 0}
  685                 }
  686         },
  687         {0, 0, 2, 0,            /* 0x58 */
  688                 {{3, 4},
  689                 {6, 6},
  690                 {0, 0},
  691                 {0, 0}
  692                 }
  693         },
  694         {1, 0, 3, 0,            /* 0x59 */
  695                 {{0, 0},
  696                 {3, 4},
  697                 {6, 6},
  698                 {0, 0}
  699                 }
  700         },
  701         {0, 0, 3, 0,            /* 0x5a */
  702                 {{1, 1},
  703                 {3, 4},
  704                 {6, 6},
  705                 {0, 0}
  706                 }
  707         },
  708         {1, 0, 3, 0,            /* 0x5b */
  709                 {{0, 1},
  710                 {3, 4},
  711                 {6, 6},
  712                 {0, 0}
  713                 }
  714         },
  715         {0, 0, 2, 0,            /* 0x5c */
  716                 {{2, 4},
  717                 {6, 6},
  718                 {0, 0},
  719                 {0, 0}
  720                 }
  721         },
  722         {1, 0, 3, 0,            /* 0x5d */
  723                 {{0, 0},
  724                 {2, 4},
  725                 {6, 6},
  726                 {0, 0}
  727                 }
  728         },
  729         {0, 0, 2, 0,            /* 0x5e */
  730                 {{1, 4},
  731                 {6, 6},
  732                 {0, 0},
  733                 {0, 0}
  734                 }
  735         },
  736         {1, 0, 2, 0,            /* 0x5f */
  737                 {{0, 4},
  738                 {6, 6},
  739                 {0, 0},
  740                 {0, 0}
  741                 }
  742         },
  743         {0, 0, 1, 0,            /* 0x60 */
  744                 {{5, 6},
  745                 {0, 0},
  746                 {0, 0},
  747                 {0, 0}
  748                 }
  749         },
  750         {1, 0, 2, 0,            /* 0x61 */
  751                 {{0, 0},
  752                 {5, 6},
  753                 {0, 0},
  754                 {0, 0}
  755                 }
  756         },
  757         {0, 0, 2, 0,            /* 0x62 */
  758                 {{1, 1},
  759                 {5, 6},
  760                 {0, 0},
  761                 {0, 0}
  762                 }
  763         },
  764         {1, 0, 2, 0,            /* 0x63 */
  765                 {{0, 1},
  766                 {5, 6},
  767                 {0, 0},
  768                 {0, 0}
  769                 }
  770         },
  771         {0, 0, 2, 0,            /* 0x64 */
  772                 {{2, 2},
  773                 {5, 6},
  774                 {0, 0},
  775                 {0, 0}
  776                 }
  777         },
  778         {1, 0, 3, 0,            /* 0x65 */
  779                 {{0, 0},
  780                 {2, 2},
  781                 {5, 6},
  782                 {0, 0}
  783                 }
  784         },
  785         {0, 0, 2, 0,            /* 0x66 */
  786                 {{1, 2},
  787                 {5, 6},
  788                 {0, 0},
  789                 {0, 0}
  790                 }
  791         },
  792         {1, 0, 2, 0,            /* 0x67 */
  793                 {{0, 2},
  794                 {5, 6},
  795                 {0, 0},
  796                 {0, 0}
  797                 }
  798         },
  799         {0, 0, 2, 0,            /* 0x68 */
  800                 {{3, 3},
  801                 {5, 6},
  802                 {0, 0},
  803                 {0, 0}
  804                 }
  805         },
  806         {1, 0, 3, 0,            /* 0x69 */
  807                 {{0, 0},
  808                 {3, 3},
  809                 {5, 6},
  810                 {0, 0}
  811                 }
  812         },
  813         {0, 0, 3, 0,            /* 0x6a */
  814                 {{1, 1},
  815                 {3, 3},
  816                 {5, 6},
  817                 {0, 0}
  818                 }
  819         },
  820         {1, 0, 3, 0,            /* 0x6b */
  821                 {{0, 1},
  822                 {3, 3},
  823                 {5, 6},
  824                 {0, 0}
  825                 }
  826         },
  827         {0, 0, 2, 0,            /* 0x6c */
  828                 {{2, 3},
  829                 {5, 6},
  830                 {0, 0},
  831                 {0, 0}
  832                 }
  833         },
  834         {1, 0, 3, 0,            /* 0x6d */
  835                 {{0, 0},
  836                 {2, 3},
  837                 {5, 6},
  838                 {0, 0}
  839                 }
  840         },
  841         {0, 0, 2, 0,            /* 0x6e */
  842                 {{1, 3},
  843                 {5, 6},
  844                 {0, 0},
  845                 {0, 0}
  846                 }
  847         },
  848         {1, 0, 2, 0,            /* 0x6f */
  849                 {{0, 3},
  850                 {5, 6},
  851                 {0, 0},
  852                 {0, 0}
  853                 }
  854         },
  855         {0, 0, 1, 0,            /* 0x70 */
  856                 {{4, 6},
  857                 {0, 0},
  858                 {0, 0},
  859                 {0, 0}
  860                 }
  861         },
  862         {1, 0, 2, 0,            /* 0x71 */
  863                 {{0, 0},
  864                 {4, 6},
  865                 {0, 0},
  866                 {0, 0}
  867                 }
  868         },
  869         {0, 0, 2, 0,            /* 0x72 */
  870                 {{1, 1},
  871                 {4, 6},
  872                 {0, 0},
  873                 {0, 0}
  874                 }
  875         },
  876         {1, 0, 2, 0,            /* 0x73 */
  877                 {{0, 1},
  878                 {4, 6},
  879                 {0, 0},
  880                 {0, 0}
  881                 }
  882         },
  883         {0, 0, 2, 0,            /* 0x74 */
  884                 {{2, 2},
  885                 {4, 6},
  886                 {0, 0},
  887                 {0, 0}
  888                 }
  889         },
  890         {1, 0, 3, 0,            /* 0x75 */
  891                 {{0, 0},
  892                 {2, 2},
  893                 {4, 6},
  894                 {0, 0}
  895                 }
  896         },
  897         {0, 0, 2, 0,            /* 0x76 */
  898                 {{1, 2},
  899                 {4, 6},
  900                 {0, 0},
  901                 {0, 0}
  902                 }
  903         },
  904         {1, 0, 2, 0,            /* 0x77 */
  905                 {{0, 2},
  906                 {4, 6},
  907                 {0, 0},
  908                 {0, 0}
  909                 }
  910         },
  911         {0, 0, 1, 0,            /* 0x78 */
  912                 {{3, 6},
  913                 {0, 0},
  914                 {0, 0},
  915                 {0, 0}
  916                 }
  917         },
  918         {1, 0, 2, 0,            /* 0x79 */
  919                 {{0, 0},
  920                 {3, 6},
  921                 {0, 0},
  922                 {0, 0}
  923                 }
  924         },
  925         {0, 0, 2, 0,            /* 0x7a */
  926                 {{1, 1},
  927                 {3, 6},
  928                 {0, 0},
  929                 {0, 0}
  930                 }
  931         },
  932         {1, 0, 2, 0,            /* 0x7b */
  933                 {{0, 1},
  934                 {3, 6},
  935                 {0, 0},
  936                 {0, 0}
  937                 }
  938         },
  939         {0, 0, 1, 0,            /* 0x7c */
  940                 {{2, 6},
  941                 {0, 0},
  942                 {0, 0},
  943                 {0, 0}
  944                 }
  945         },
  946         {1, 0, 2, 0,            /* 0x7d */
  947                 {{0, 0},
  948                 {2, 6},
  949                 {0, 0},
  950                 {0, 0}
  951                 }
  952         },
  953         {0, 0, 1, 0,            /* 0x7e */
  954                 {{1, 6},
  955                 {0, 0},
  956                 {0, 0},
  957                 {0, 0}
  958                 }
  959         },
  960         {1, 0, 1, 0,            /* 0x7f */
  961                 {{0, 6},
  962                 {0, 0},
  963                 {0, 0},
  964                 {0, 0}
  965                 }
  966         },
  967         {0, 1, 1, 0,            /* 0x80 */
  968                 {{7, 7},
  969                 {0, 0},
  970                 {0, 0},
  971                 {0, 0}
  972                 }
  973         },
  974         {1, 1, 2, 0,            /* 0x81 */
  975                 {{0, 0},
  976                 {7, 7},
  977                 {0, 0},
  978                 {0, 0}
  979                 }
  980         },
  981         {0, 1, 2, 0,            /* 0x82 */
  982                 {{1, 1},
  983                 {7, 7},
  984                 {0, 0},
  985                 {0, 0}
  986                 }
  987         },
  988         {1, 1, 2, 0,            /* 0x83 */
  989                 {{0, 1},
  990                 {7, 7},
  991                 {0, 0},
  992                 {0, 0}
  993                 }
  994         },
  995         {0, 1, 2, 0,            /* 0x84 */
  996                 {{2, 2},
  997                 {7, 7},
  998                 {0, 0},
  999                 {0, 0}
 1000                 }
 1001         },
 1002         {1, 1, 3, 0,            /* 0x85 */
 1003                 {{0, 0},
 1004                 {2, 2},
 1005                 {7, 7},
 1006                 {0, 0}
 1007                 }
 1008         },
 1009         {0, 1, 2, 0,            /* 0x86 */
 1010                 {{1, 2},
 1011                 {7, 7},
 1012                 {0, 0},
 1013                 {0, 0}
 1014                 }
 1015         },
 1016         {1, 1, 2, 0,            /* 0x87 */
 1017                 {{0, 2},
 1018                 {7, 7},
 1019                 {0, 0},
 1020                 {0, 0}
 1021                 }
 1022         },
 1023         {0, 1, 2, 0,            /* 0x88 */
 1024                 {{3, 3},
 1025                 {7, 7},
 1026                 {0, 0},
 1027                 {0, 0}
 1028                 }
 1029         },
 1030         {1, 1, 3, 0,            /* 0x89 */
 1031                 {{0, 0},
 1032                 {3, 3},
 1033                 {7, 7},
 1034                 {0, 0}
 1035                 }
 1036         },
 1037         {0, 1, 3, 0,            /* 0x8a */
 1038                 {{1, 1},
 1039                 {3, 3},
 1040                 {7, 7},
 1041                 {0, 0}
 1042                 }
 1043         },
 1044         {1, 1, 3, 0,            /* 0x8b */
 1045                 {{0, 1},
 1046                 {3, 3},
 1047                 {7, 7},
 1048                 {0, 0}
 1049                 }
 1050         },
 1051         {0, 1, 2, 0,            /* 0x8c */
 1052                 {{2, 3},
 1053                 {7, 7},
 1054                 {0, 0},
 1055                 {0, 0}
 1056                 }
 1057         },
 1058         {1, 1, 3, 0,            /* 0x8d */
 1059                 {{0, 0},
 1060                 {2, 3},
 1061                 {7, 7},
 1062                 {0, 0}
 1063                 }
 1064         },
 1065         {0, 1, 2, 0,            /* 0x8e */
 1066                 {{1, 3},
 1067                 {7, 7},
 1068                 {0, 0},
 1069                 {0, 0}
 1070                 }
 1071         },
 1072         {1, 1, 2, 0,            /* 0x8f */
 1073                 {{0, 3},
 1074                 {7, 7},
 1075                 {0, 0},
 1076                 {0, 0}
 1077                 }
 1078         },
 1079         {0, 1, 2, 0,            /* 0x90 */
 1080                 {{4, 4},
 1081                 {7, 7},
 1082                 {0, 0},
 1083                 {0, 0}
 1084                 }
 1085         },
 1086         {1, 1, 3, 0,            /* 0x91 */
 1087                 {{0, 0},
 1088                 {4, 4},
 1089                 {7, 7},
 1090                 {0, 0}
 1091                 }
 1092         },
 1093         {0, 1, 3, 0,            /* 0x92 */
 1094                 {{1, 1},
 1095                 {4, 4},
 1096                 {7, 7},
 1097                 {0, 0}
 1098                 }
 1099         },
 1100         {1, 1, 3, 0,            /* 0x93 */
 1101                 {{0, 1},
 1102                 {4, 4},
 1103                 {7, 7},
 1104                 {0, 0}
 1105                 }
 1106         },
 1107         {0, 1, 3, 0,            /* 0x94 */
 1108                 {{2, 2},
 1109                 {4, 4},
 1110                 {7, 7},
 1111                 {0, 0}
 1112                 }
 1113         },
 1114         {1, 1, 4, 0,            /* 0x95 */
 1115                 {{0, 0},
 1116                 {2, 2},
 1117                 {4, 4},
 1118                 {7, 7}
 1119                 }
 1120         },
 1121         {0, 1, 3, 0,            /* 0x96 */
 1122                 {{1, 2},
 1123                 {4, 4},
 1124                 {7, 7},
 1125                 {0, 0}
 1126                 }
 1127         },
 1128         {1, 1, 3, 0,            /* 0x97 */
 1129                 {{0, 2},
 1130                 {4, 4},
 1131                 {7, 7},
 1132                 {0, 0}
 1133                 }
 1134         },
 1135         {0, 1, 2, 0,            /* 0x98 */
 1136                 {{3, 4},
 1137                 {7, 7},
 1138                 {0, 0},
 1139                 {0, 0}
 1140                 }
 1141         },
 1142         {1, 1, 3, 0,            /* 0x99 */
 1143                 {{0, 0},
 1144                 {3, 4},
 1145                 {7, 7},
 1146                 {0, 0}
 1147                 }
 1148         },
 1149         {0, 1, 3, 0,            /* 0x9a */
 1150                 {{1, 1},
 1151                 {3, 4},
 1152                 {7, 7},
 1153                 {0, 0}
 1154                 }
 1155         },
 1156         {1, 1, 3, 0,            /* 0x9b */
 1157                 {{0, 1},
 1158                 {3, 4},
 1159                 {7, 7},
 1160                 {0, 0}
 1161                 }
 1162         },
 1163         {0, 1, 2, 0,            /* 0x9c */
 1164                 {{2, 4},
 1165                 {7, 7},
 1166                 {0, 0},
 1167                 {0, 0}
 1168                 }
 1169         },
 1170         {1, 1, 3, 0,            /* 0x9d */
 1171                 {{0, 0},
 1172                 {2, 4},
 1173                 {7, 7},
 1174                 {0, 0}
 1175                 }
 1176         },
 1177         {0, 1, 2, 0,            /* 0x9e */
 1178                 {{1, 4},
 1179                 {7, 7},
 1180                 {0, 0},
 1181                 {0, 0}
 1182                 }
 1183         },
 1184         {1, 1, 2, 0,            /* 0x9f */
 1185                 {{0, 4},
 1186                 {7, 7},
 1187                 {0, 0},
 1188                 {0, 0}
 1189                 }
 1190         },
 1191         {0, 1, 2, 0,            /* 0xa0 */
 1192                 {{5, 5},
 1193                 {7, 7},
 1194                 {0, 0},
 1195                 {0, 0}
 1196                 }
 1197         },
 1198         {1, 1, 3, 0,            /* 0xa1 */
 1199                 {{0, 0},
 1200                 {5, 5},
 1201                 {7, 7},
 1202                 {0, 0}
 1203                 }
 1204         },
 1205         {0, 1, 3, 0,            /* 0xa2 */
 1206                 {{1, 1},
 1207                 {5, 5},
 1208                 {7, 7},
 1209                 {0, 0}
 1210                 }
 1211         },
 1212         {1, 1, 3, 0,            /* 0xa3 */
 1213                 {{0, 1},
 1214                 {5, 5},
 1215                 {7, 7},
 1216                 {0, 0}
 1217                 }
 1218         },
 1219         {0, 1, 3, 0,            /* 0xa4 */
 1220                 {{2, 2},
 1221                 {5, 5},
 1222                 {7, 7},
 1223                 {0, 0}
 1224                 }
 1225         },
 1226         {1, 1, 4, 0,            /* 0xa5 */
 1227                 {{0, 0},
 1228                 {2, 2},
 1229                 {5, 5},
 1230                 {7, 7}
 1231                 }
 1232         },
 1233         {0, 1, 3, 0,            /* 0xa6 */
 1234                 {{1, 2},
 1235                 {5, 5},
 1236                 {7, 7},
 1237                 {0, 0}
 1238                 }
 1239         },
 1240         {1, 1, 3, 0,            /* 0xa7 */
 1241                 {{0, 2},
 1242                 {5, 5},
 1243                 {7, 7},
 1244                 {0, 0}
 1245                 }
 1246         },
 1247         {0, 1, 3, 0,            /* 0xa8 */
 1248                 {{3, 3},
 1249                 {5, 5},
 1250                 {7, 7},
 1251                 {0, 0}
 1252                 }
 1253         },
 1254         {1, 1, 4, 0,            /* 0xa9 */
 1255                 {{0, 0},
 1256                 {3, 3},
 1257                 {5, 5},
 1258                 {7, 7}
 1259                 }
 1260         },
 1261         {0, 1, 4, 0,            /* 0xaa */
 1262                 {{1, 1},
 1263                 {3, 3},
 1264                 {5, 5},
 1265                 {7, 7}
 1266                 }
 1267         },
 1268         {1, 1, 4, 0,            /* 0xab */
 1269                 {{0, 1},
 1270                 {3, 3},
 1271                 {5, 5},
 1272                 {7, 7}
 1273                 }
 1274         },
 1275         {0, 1, 3, 0,            /* 0xac */
 1276                 {{2, 3},
 1277                 {5, 5},
 1278                 {7, 7},
 1279                 {0, 0}
 1280                 }
 1281         },
 1282         {1, 1, 4, 0,            /* 0xad */
 1283                 {{0, 0},
 1284                 {2, 3},
 1285                 {5, 5},
 1286                 {7, 7}
 1287                 }
 1288         },
 1289         {0, 1, 3, 0,            /* 0xae */
 1290                 {{1, 3},
 1291                 {5, 5},
 1292                 {7, 7},
 1293                 {0, 0}
 1294                 }
 1295         },
 1296         {1, 1, 3, 0,            /* 0xaf */
 1297                 {{0, 3},
 1298                 {5, 5},
 1299                 {7, 7},
 1300                 {0, 0}
 1301                 }
 1302         },
 1303         {0, 1, 2, 0,            /* 0xb0 */
 1304                 {{4, 5},
 1305                 {7, 7},
 1306                 {0, 0},
 1307                 {0, 0}
 1308                 }
 1309         },
 1310         {1, 1, 3, 0,            /* 0xb1 */
 1311                 {{0, 0},
 1312                 {4, 5},
 1313                 {7, 7},
 1314                 {0, 0}
 1315                 }
 1316         },
 1317         {0, 1, 3, 0,            /* 0xb2 */
 1318                 {{1, 1},
 1319                 {4, 5},
 1320                 {7, 7},
 1321                 {0, 0}
 1322                 }
 1323         },
 1324         {1, 1, 3, 0,            /* 0xb3 */
 1325                 {{0, 1},
 1326                 {4, 5},
 1327                 {7, 7},
 1328                 {0, 0}
 1329                 }
 1330         },
 1331         {0, 1, 3, 0,            /* 0xb4 */
 1332                 {{2, 2},
 1333                 {4, 5},
 1334                 {7, 7},
 1335                 {0, 0}
 1336                 }
 1337         },
 1338         {1, 1, 4, 0,            /* 0xb5 */
 1339                 {{0, 0},
 1340                 {2, 2},
 1341                 {4, 5},
 1342                 {7, 7}
 1343                 }
 1344         },
 1345         {0, 1, 3, 0,            /* 0xb6 */
 1346                 {{1, 2},
 1347                 {4, 5},
 1348                 {7, 7},
 1349                 {0, 0}
 1350                 }
 1351         },
 1352         {1, 1, 3, 0,            /* 0xb7 */
 1353                 {{0, 2},
 1354                 {4, 5},
 1355                 {7, 7},
 1356                 {0, 0}
 1357                 }
 1358         },
 1359         {0, 1, 2, 0,            /* 0xb8 */
 1360                 {{3, 5},
 1361                 {7, 7},
 1362                 {0, 0},
 1363                 {0, 0}
 1364                 }
 1365         },
 1366         {1, 1, 3, 0,            /* 0xb9 */
 1367                 {{0, 0},
 1368                 {3, 5},
 1369                 {7, 7},
 1370                 {0, 0}
 1371                 }
 1372         },
 1373         {0, 1, 3, 0,            /* 0xba */
 1374                 {{1, 1},
 1375                 {3, 5},
 1376                 {7, 7},
 1377                 {0, 0}
 1378                 }
 1379         },
 1380         {1, 1, 3, 0,            /* 0xbb */
 1381                 {{0, 1},
 1382                 {3, 5},
 1383                 {7, 7},
 1384                 {0, 0}
 1385                 }
 1386         },
 1387         {0, 1, 2, 0,            /* 0xbc */
 1388                 {{2, 5},
 1389                 {7, 7},
 1390                 {0, 0},
 1391                 {0, 0}
 1392                 }
 1393         },
 1394         {1, 1, 3, 0,            /* 0xbd */
 1395                 {{0, 0},
 1396                 {2, 5},
 1397                 {7, 7},
 1398                 {0, 0}
 1399                 }
 1400         },
 1401         {0, 1, 2, 0,            /* 0xbe */
 1402                 {{1, 5},
 1403                 {7, 7},
 1404                 {0, 0},
 1405                 {0, 0}
 1406                 }
 1407         },
 1408         {1, 1, 2, 0,            /* 0xbf */
 1409                 {{0, 5},
 1410                 {7, 7},
 1411                 {0, 0},
 1412                 {0, 0}
 1413                 }
 1414         },
 1415         {0, 1, 1, 0,            /* 0xc0 */
 1416                 {{6, 7},
 1417                 {0, 0},
 1418                 {0, 0},
 1419                 {0, 0}
 1420                 }
 1421         },
 1422         {1, 1, 2, 0,            /* 0xc1 */
 1423                 {{0, 0},
 1424                 {6, 7},
 1425                 {0, 0},
 1426                 {0, 0}
 1427                 }
 1428         },
 1429         {0, 1, 2, 0,            /* 0xc2 */
 1430                 {{1, 1},
 1431                 {6, 7},
 1432                 {0, 0},
 1433                 {0, 0}
 1434                 }
 1435         },
 1436         {1, 1, 2, 0,            /* 0xc3 */
 1437                 {{0, 1},
 1438                 {6, 7},
 1439                 {0, 0},
 1440                 {0, 0}
 1441                 }
 1442         },
 1443         {0, 1, 2, 0,            /* 0xc4 */
 1444                 {{2, 2},
 1445                 {6, 7},
 1446                 {0, 0},
 1447                 {0, 0}
 1448                 }
 1449         },
 1450         {1, 1, 3, 0,            /* 0xc5 */
 1451                 {{0, 0},
 1452                 {2, 2},
 1453                 {6, 7},
 1454                 {0, 0}
 1455                 }
 1456         },
 1457         {0, 1, 2, 0,            /* 0xc6 */
 1458                 {{1, 2},
 1459                 {6, 7},
 1460                 {0, 0},
 1461                 {0, 0}
 1462                 }
 1463         },
 1464         {1, 1, 2, 0,            /* 0xc7 */
 1465                 {{0, 2},
 1466                 {6, 7},
 1467                 {0, 0},
 1468                 {0, 0}
 1469                 }
 1470         },
 1471         {0, 1, 2, 0,            /* 0xc8 */
 1472                 {{3, 3},
 1473                 {6, 7},
 1474                 {0, 0},
 1475                 {0, 0}
 1476                 }
 1477         },
 1478         {1, 1, 3, 0,            /* 0xc9 */
 1479                 {{0, 0},
 1480                 {3, 3},
 1481                 {6, 7},
 1482                 {0, 0}
 1483                 }
 1484         },
 1485         {0, 1, 3, 0,            /* 0xca */
 1486                 {{1, 1},
 1487                 {3, 3},
 1488                 {6, 7},
 1489                 {0, 0}
 1490                 }
 1491         },
 1492         {1, 1, 3, 0,            /* 0xcb */
 1493                 {{0, 1},
 1494                 {3, 3},
 1495                 {6, 7},
 1496                 {0, 0}
 1497                 }
 1498         },
 1499         {0, 1, 2, 0,            /* 0xcc */
 1500                 {{2, 3},
 1501                 {6, 7},
 1502                 {0, 0},
 1503                 {0, 0}
 1504                 }
 1505         },
 1506         {1, 1, 3, 0,            /* 0xcd */
 1507                 {{0, 0},
 1508                 {2, 3},
 1509                 {6, 7},
 1510                 {0, 0}
 1511                 }
 1512         },
 1513         {0, 1, 2, 0,            /* 0xce */
 1514                 {{1, 3},
 1515                 {6, 7},
 1516                 {0, 0},
 1517                 {0, 0}
 1518                 }
 1519         },
 1520         {1, 1, 2, 0,            /* 0xcf */
 1521                 {{0, 3},
 1522                 {6, 7},
 1523                 {0, 0},
 1524                 {0, 0}
 1525                 }
 1526         },
 1527         {0, 1, 2, 0,            /* 0xd0 */
 1528                 {{4, 4},
 1529                 {6, 7},
 1530                 {0, 0},
 1531                 {0, 0}
 1532                 }
 1533         },
 1534         {1, 1, 3, 0,            /* 0xd1 */
 1535                 {{0, 0},
 1536                 {4, 4},
 1537                 {6, 7},
 1538                 {0, 0}
 1539                 }
 1540         },
 1541         {0, 1, 3, 0,            /* 0xd2 */
 1542                 {{1, 1},
 1543                 {4, 4},
 1544                 {6, 7},
 1545                 {0, 0}
 1546                 }
 1547         },
 1548         {1, 1, 3, 0,            /* 0xd3 */
 1549                 {{0, 1},
 1550                 {4, 4},
 1551                 {6, 7},
 1552                 {0, 0}
 1553                 }
 1554         },
 1555         {0, 1, 3, 0,            /* 0xd4 */
 1556                 {{2, 2},
 1557                 {4, 4},
 1558                 {6, 7},
 1559                 {0, 0}
 1560                 }
 1561         },
 1562         {1, 1, 4, 0,            /* 0xd5 */
 1563                 {{0, 0},
 1564                 {2, 2},
 1565                 {4, 4},
 1566                 {6, 7}
 1567                 }
 1568         },
 1569         {0, 1, 3, 0,            /* 0xd6 */
 1570                 {{1, 2},
 1571                 {4, 4},
 1572                 {6, 7},
 1573                 {0, 0}
 1574                 }
 1575         },
 1576         {1, 1, 3, 0,            /* 0xd7 */
 1577                 {{0, 2},
 1578                 {4, 4},
 1579                 {6, 7},
 1580                 {0, 0}
 1581                 }
 1582         },
 1583         {0, 1, 2, 0,            /* 0xd8 */
 1584                 {{3, 4},
 1585                 {6, 7},
 1586                 {0, 0},
 1587                 {0, 0}
 1588                 }
 1589         },
 1590         {1, 1, 3, 0,            /* 0xd9 */
 1591                 {{0, 0},
 1592                 {3, 4},
 1593                 {6, 7},
 1594                 {0, 0}
 1595                 }
 1596         },
 1597         {0, 1, 3, 0,            /* 0xda */
 1598                 {{1, 1},
 1599                 {3, 4},
 1600                 {6, 7},
 1601                 {0, 0}
 1602                 }
 1603         },
 1604         {1, 1, 3, 0,            /* 0xdb */
 1605                 {{0, 1},
 1606                 {3, 4},
 1607                 {6, 7},
 1608                 {0, 0}
 1609                 }
 1610         },
 1611         {0, 1, 2, 0,            /* 0xdc */
 1612                 {{2, 4},
 1613                 {6, 7},
 1614                 {0, 0},
 1615                 {0, 0}
 1616                 }
 1617         },
 1618         {1, 1, 3, 0,            /* 0xdd */
 1619                 {{0, 0},
 1620                 {2, 4},
 1621                 {6, 7},
 1622                 {0, 0}
 1623                 }
 1624         },
 1625         {0, 1, 2, 0,            /* 0xde */
 1626                 {{1, 4},
 1627                 {6, 7},
 1628                 {0, 0},
 1629                 {0, 0}
 1630                 }
 1631         },
 1632         {1, 1, 2, 0,            /* 0xdf */
 1633                 {{0, 4},
 1634                 {6, 7},
 1635                 {0, 0},
 1636                 {0, 0}
 1637                 }
 1638         },
 1639         {0, 1, 1, 0,            /* 0xe0 */
 1640                 {{5, 7},
 1641                 {0, 0},
 1642                 {0, 0},
 1643                 {0, 0}
 1644                 }
 1645         },
 1646         {1, 1, 2, 0,            /* 0xe1 */
 1647                 {{0, 0},
 1648                 {5, 7},
 1649                 {0, 0},
 1650                 {0, 0}
 1651                 }
 1652         },
 1653         {0, 1, 2, 0,            /* 0xe2 */
 1654                 {{1, 1},
 1655                 {5, 7},
 1656                 {0, 0},
 1657                 {0, 0}
 1658                 }
 1659         },
 1660         {1, 1, 2, 0,            /* 0xe3 */
 1661                 {{0, 1},
 1662                 {5, 7},
 1663                 {0, 0},
 1664                 {0, 0}
 1665                 }
 1666         },
 1667         {0, 1, 2, 0,            /* 0xe4 */
 1668                 {{2, 2},
 1669                 {5, 7},
 1670                 {0, 0},
 1671                 {0, 0}
 1672                 }
 1673         },
 1674         {1, 1, 3, 0,            /* 0xe5 */
 1675                 {{0, 0},
 1676                 {2, 2},
 1677                 {5, 7},
 1678                 {0, 0}
 1679                 }
 1680         },
 1681         {0, 1, 2, 0,            /* 0xe6 */
 1682                 {{1, 2},
 1683                 {5, 7},
 1684                 {0, 0},
 1685                 {0, 0}
 1686                 }
 1687         },
 1688         {1, 1, 2, 0,            /* 0xe7 */
 1689                 {{0, 2},
 1690                 {5, 7},
 1691                 {0, 0},
 1692                 {0, 0}
 1693                 }
 1694         },
 1695         {0, 1, 2, 0,            /* 0xe8 */
 1696                 {{3, 3},
 1697                 {5, 7},
 1698                 {0, 0},
 1699                 {0, 0}
 1700                 }
 1701         },
 1702         {1, 1, 3, 0,            /* 0xe9 */
 1703                 {{0, 0},
 1704                 {3, 3},
 1705                 {5, 7},
 1706                 {0, 0}
 1707                 }
 1708         },
 1709         {0, 1, 3, 0,            /* 0xea */
 1710                 {{1, 1},
 1711                 {3, 3},
 1712                 {5, 7},
 1713                 {0, 0}
 1714                 }
 1715         },
 1716         {1, 1, 3, 0,            /* 0xeb */
 1717                 {{0, 1},
 1718                 {3, 3},
 1719                 {5, 7},
 1720                 {0, 0}
 1721                 }
 1722         },
 1723         {0, 1, 2, 0,            /* 0xec */
 1724                 {{2, 3},
 1725                 {5, 7},
 1726                 {0, 0},
 1727                 {0, 0}
 1728                 }
 1729         },
 1730         {1, 1, 3, 0,            /* 0xed */
 1731                 {{0, 0},
 1732                 {2, 3},
 1733                 {5, 7},
 1734                 {0, 0}
 1735                 }
 1736         },
 1737         {0, 1, 2, 0,            /* 0xee */
 1738                 {{1, 3},
 1739                 {5, 7},
 1740                 {0, 0},
 1741                 {0, 0}
 1742                 }
 1743         },
 1744         {1, 1, 2, 0,            /* 0xef */
 1745                 {{0, 3},
 1746                 {5, 7},
 1747                 {0, 0},
 1748                 {0, 0}
 1749                 }
 1750         },
 1751         {0, 1, 1, 0,            /* 0xf0 */
 1752                 {{4, 7},
 1753                 {0, 0},
 1754                 {0, 0},
 1755                 {0, 0}
 1756                 }
 1757         },
 1758         {1, 1, 2, 0,            /* 0xf1 */
 1759                 {{0, 0},
 1760                 {4, 7},
 1761                 {0, 0},
 1762                 {0, 0}
 1763                 }
 1764         },
 1765         {0, 1, 2, 0,            /* 0xf2 */
 1766                 {{1, 1},
 1767                 {4, 7},
 1768                 {0, 0},
 1769                 {0, 0}
 1770                 }
 1771         },
 1772         {1, 1, 2, 0,            /* 0xf3 */
 1773                 {{0, 1},
 1774                 {4, 7},
 1775                 {0, 0},
 1776                 {0, 0}
 1777                 }
 1778         },
 1779         {0, 1, 2, 0,            /* 0xf4 */
 1780                 {{2, 2},
 1781                 {4, 7},
 1782                 {0, 0},
 1783                 {0, 0}
 1784                 }
 1785         },
 1786         {1, 1, 3, 0,            /* 0xf5 */
 1787                 {{0, 0},
 1788                 {2, 2},
 1789                 {4, 7},
 1790                 {0, 0}
 1791                 }
 1792         },
 1793         {0, 1, 2, 0,            /* 0xf6 */
 1794                 {{1, 2},
 1795                 {4, 7},
 1796                 {0, 0},
 1797                 {0, 0}
 1798                 }
 1799         },
 1800         {1, 1, 2, 0,            /* 0xf7 */
 1801                 {{0, 2},
 1802                 {4, 7},
 1803                 {0, 0},
 1804                 {0, 0}
 1805                 }
 1806         },
 1807         {0, 1, 1, 0,            /* 0xf8 */
 1808                 {{3, 7},
 1809                 {0, 0},
 1810                 {0, 0},
 1811                 {0, 0}
 1812                 }
 1813         },
 1814         {1, 1, 2, 0,            /* 0xf9 */
 1815                 {{0, 0},
 1816                 {3, 7},
 1817                 {0, 0},
 1818                 {0, 0}
 1819                 }
 1820         },
 1821         {0, 1, 2, 0,            /* 0xfa */
 1822                 {{1, 1},
 1823                 {3, 7},
 1824                 {0, 0},
 1825                 {0, 0}
 1826                 }
 1827         },
 1828         {1, 1, 2, 0,            /* 0xfb */
 1829                 {{0, 1},
 1830                 {3, 7},
 1831                 {0, 0},
 1832                 {0, 0}
 1833                 }
 1834         },
 1835         {0, 1, 1, 0,            /* 0xfc */
 1836                 {{2, 7},
 1837                 {0, 0},
 1838                 {0, 0},
 1839                 {0, 0}
 1840                 }
 1841         },
 1842         {1, 1, 2, 0,            /* 0xfd */
 1843                 {{0, 0},
 1844                 {2, 7},
 1845                 {0, 0},
 1846                 {0, 0}
 1847                 }
 1848         },
 1849         {0, 1, 1, 0,            /* 0xfe */
 1850                 {{1, 7},
 1851                 {0, 0},
 1852                 {0, 0},
 1853                 {0, 0}
 1854                 }
 1855         },
 1856         {1, 1, 1, 0,            /* 0xff */
 1857                 {{0, 7},
 1858                 {0, 0},
 1859                 {0, 0},
 1860                 {0, 0}
 1861                 }
 1862         }
 1863 };
 1864 
 1865 
 1866 int
 1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
 1868     struct sctp_scoping *scope,
 1869     int do_update)
 1870 {
 1871         if ((scope->loopback_scope == 0) &&
 1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
 1873                 /*
 1874                  * skip loopback if not in scope *
 1875                  */
 1876                 return (0);
 1877         }
 1878         switch (ifa->address.sa.sa_family) {
 1879 #ifdef INET
 1880         case AF_INET:
 1881                 if (scope->ipv4_addr_legal) {
 1882                         struct sockaddr_in *sin;
 1883 
 1884                         sin = &ifa->address.sin;
 1885                         if (sin->sin_addr.s_addr == 0) {
 1886                                 /* not in scope , unspecified */
 1887                                 return (0);
 1888                         }
 1889                         if ((scope->ipv4_local_scope == 0) &&
 1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 1891                                 /* private address not in scope */
 1892                                 return (0);
 1893                         }
 1894                 } else {
 1895                         return (0);
 1896                 }
 1897                 break;
 1898 #endif
 1899 #ifdef INET6
 1900         case AF_INET6:
 1901                 if (scope->ipv6_addr_legal) {
 1902                         struct sockaddr_in6 *sin6;
 1903 
 1904                         /*
 1905                          * Must update the flags,  bummer, which means any
 1906                          * IFA locks must now be applied HERE <->
 1907                          */
 1908                         if (do_update) {
 1909                                 sctp_gather_internal_ifa_flags(ifa);
 1910                         }
 1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 1912                                 return (0);
 1913                         }
 1914                         /* ok to use deprecated addresses? */
 1915                         sin6 = &ifa->address.sin6;
 1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1917                                 /* skip unspecifed addresses */
 1918                                 return (0);
 1919                         }
 1920                         if (    /* (local_scope == 0) && */
 1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
 1922                                 return (0);
 1923                         }
 1924                         if ((scope->site_scope == 0) &&
 1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 1926                                 return (0);
 1927                         }
 1928                 } else {
 1929                         return (0);
 1930                 }
 1931                 break;
 1932 #endif
 1933         default:
 1934                 return (0);
 1935         }
 1936         return (1);
 1937 }
 1938 
 1939 static struct mbuf *
 1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t *len)
 1941 {
 1942 #if defined(INET) || defined(INET6)
 1943         struct sctp_paramhdr *paramh;
 1944         struct mbuf *mret;
 1945         uint16_t plen;
 1946 #endif
 1947 
 1948         switch (ifa->address.sa.sa_family) {
 1949 #ifdef INET
 1950         case AF_INET:
 1951                 plen = (uint16_t)sizeof(struct sctp_ipv4addr_param);
 1952                 break;
 1953 #endif
 1954 #ifdef INET6
 1955         case AF_INET6:
 1956                 plen = (uint16_t)sizeof(struct sctp_ipv6addr_param);
 1957                 break;
 1958 #endif
 1959         default:
 1960                 return (m);
 1961         }
 1962 #if defined(INET) || defined(INET6)
 1963         if (M_TRAILINGSPACE(m) >= plen) {
 1964                 /* easy side we just drop it on the end */
 1965                 paramh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
 1966                 mret = m;
 1967         } else {
 1968                 /* Need more space */
 1969                 mret = m;
 1970                 while (SCTP_BUF_NEXT(mret) != NULL) {
 1971                         mret = SCTP_BUF_NEXT(mret);
 1972                 }
 1973                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
 1974                 if (SCTP_BUF_NEXT(mret) == NULL) {
 1975                         /* We are hosed, can't add more addresses */
 1976                         return (m);
 1977                 }
 1978                 mret = SCTP_BUF_NEXT(mret);
 1979                 paramh = mtod(mret, struct sctp_paramhdr *);
 1980         }
 1981         /* now add the parameter */
 1982         switch (ifa->address.sa.sa_family) {
 1983 #ifdef INET
 1984         case AF_INET:
 1985                 {
 1986                         struct sctp_ipv4addr_param *ipv4p;
 1987                         struct sockaddr_in *sin;
 1988 
 1989                         sin = &ifa->address.sin;
 1990                         ipv4p = (struct sctp_ipv4addr_param *)paramh;
 1991                         paramh->param_type = htons(SCTP_IPV4_ADDRESS);
 1992                         paramh->param_length = htons(plen);
 1993                         ipv4p->addr = sin->sin_addr.s_addr;
 1994                         SCTP_BUF_LEN(mret) += plen;
 1995                         break;
 1996                 }
 1997 #endif
 1998 #ifdef INET6
 1999         case AF_INET6:
 2000                 {
 2001                         struct sctp_ipv6addr_param *ipv6p;
 2002                         struct sockaddr_in6 *sin6;
 2003 
 2004                         sin6 = &ifa->address.sin6;
 2005                         ipv6p = (struct sctp_ipv6addr_param *)paramh;
 2006                         paramh->param_type = htons(SCTP_IPV6_ADDRESS);
 2007                         paramh->param_length = htons(plen);
 2008                         memcpy(ipv6p->addr, &sin6->sin6_addr,
 2009                             sizeof(ipv6p->addr));
 2010                         /* clear embedded scope in the address */
 2011                         in6_clearscope((struct in6_addr *)ipv6p->addr);
 2012                         SCTP_BUF_LEN(mret) += plen;
 2013                         break;
 2014                 }
 2015 #endif
 2016         default:
 2017                 return (m);
 2018         }
 2019         if (len != NULL) {
 2020                 *len += plen;
 2021         }
 2022         return (mret);
 2023 #endif
 2024 }
 2025 
 2026 
 2027 struct mbuf *
 2028 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 2029     struct sctp_scoping *scope,
 2030     struct mbuf *m_at, int cnt_inits_to,
 2031     uint16_t *padding_len, uint16_t *chunk_len)
 2032 {
 2033         struct sctp_vrf *vrf = NULL;
 2034         int cnt, limit_out = 0, total_count;
 2035         uint32_t vrf_id;
 2036 
 2037         vrf_id = inp->def_vrf_id;
 2038         SCTP_IPI_ADDR_RLOCK();
 2039         vrf = sctp_find_vrf(vrf_id);
 2040         if (vrf == NULL) {
 2041                 SCTP_IPI_ADDR_RUNLOCK();
 2042                 return (m_at);
 2043         }
 2044         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 2045                 struct sctp_ifa *sctp_ifap;
 2046                 struct sctp_ifn *sctp_ifnp;
 2047 
 2048                 cnt = cnt_inits_to;
 2049                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 2050                         limit_out = 1;
 2051                         cnt = SCTP_ADDRESS_LIMIT;
 2052                         goto skip_count;
 2053                 }
 2054                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2055                         if ((scope->loopback_scope == 0) &&
 2056                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2057                                 /*
 2058                                  * Skip loopback devices if loopback_scope
 2059                                  * not set
 2060                                  */
 2061                                 continue;
 2062                         }
 2063                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2064 #ifdef INET
 2065                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2066                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2067                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
 2068                                         continue;
 2069                                 }
 2070 #endif
 2071 #ifdef INET6
 2072                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2073                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2074                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2075                                         continue;
 2076                                 }
 2077 #endif
 2078                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2079                                         continue;
 2080                                 }
 2081                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
 2082                                         continue;
 2083                                 }
 2084                                 cnt++;
 2085                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2086                                         break;
 2087                                 }
 2088                         }
 2089                         if (cnt > SCTP_ADDRESS_LIMIT) {
 2090                                 break;
 2091                         }
 2092                 }
 2093 skip_count:
 2094                 if (cnt > 1) {
 2095                         total_count = 0;
 2096                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2097                                 cnt = 0;
 2098                                 if ((scope->loopback_scope == 0) &&
 2099                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2100                                         /*
 2101                                          * Skip loopback devices if
 2102                                          * loopback_scope not set
 2103                                          */
 2104                                         continue;
 2105                                 }
 2106                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2107 #ifdef INET
 2108                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2109                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2110                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
 2111                                                 continue;
 2112                                         }
 2113 #endif
 2114 #ifdef INET6
 2115                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2116                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2117                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2118                                                 continue;
 2119                                         }
 2120 #endif
 2121                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2122                                                 continue;
 2123                                         }
 2124                                         if (sctp_is_address_in_scope(sctp_ifap,
 2125                                             scope, 0) == 0) {
 2126                                                 continue;
 2127                                         }
 2128                                         if ((chunk_len != NULL) &&
 2129                                             (padding_len != NULL) &&
 2130                                             (*padding_len > 0)) {
 2131                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2132                                                 SCTP_BUF_LEN(m_at) += *padding_len;
 2133                                                 *chunk_len += *padding_len;
 2134                                                 *padding_len = 0;
 2135                                         }
 2136                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
 2137                                         if (limit_out) {
 2138                                                 cnt++;
 2139                                                 total_count++;
 2140                                                 if (cnt >= 2) {
 2141                                                         /*
 2142                                                          * two from each
 2143                                                          * address
 2144                                                          */
 2145                                                         break;
 2146                                                 }
 2147                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 2148                                                         /* No more addresses */
 2149                                                         break;
 2150                                                 }
 2151                                         }
 2152                                 }
 2153                         }
 2154                 }
 2155         } else {
 2156                 struct sctp_laddr *laddr;
 2157 
 2158                 cnt = cnt_inits_to;
 2159                 /* First, how many ? */
 2160                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2161                         if (laddr->ifa == NULL) {
 2162                                 continue;
 2163                         }
 2164                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2165                                 /*
 2166                                  * Address being deleted by the system, dont
 2167                                  * list.
 2168                                  */
 2169                                 continue;
 2170                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2171                                 /*
 2172                                  * Address being deleted on this ep don't
 2173                                  * list.
 2174                                  */
 2175                                 continue;
 2176                         }
 2177                         if (sctp_is_address_in_scope(laddr->ifa,
 2178                             scope, 1) == 0) {
 2179                                 continue;
 2180                         }
 2181                         cnt++;
 2182                 }
 2183                 /*
 2184                  * To get through a NAT we only list addresses if we have
 2185                  * more than one. That way if you just bind a single address
 2186                  * we let the source of the init dictate our address.
 2187                  */
 2188                 if (cnt > 1) {
 2189                         cnt = cnt_inits_to;
 2190                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2191                                 if (laddr->ifa == NULL) {
 2192                                         continue;
 2193                                 }
 2194                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
 2195                                         continue;
 2196                                 }
 2197                                 if (sctp_is_address_in_scope(laddr->ifa,
 2198                                     scope, 0) == 0) {
 2199                                         continue;
 2200                                 }
 2201                                 if ((chunk_len != NULL) &&
 2202                                     (padding_len != NULL) &&
 2203                                     (*padding_len > 0)) {
 2204                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2205                                         SCTP_BUF_LEN(m_at) += *padding_len;
 2206                                         *chunk_len += *padding_len;
 2207                                         *padding_len = 0;
 2208                                 }
 2209                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
 2210                                 cnt++;
 2211                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 2212                                         break;
 2213                                 }
 2214                         }
 2215                 }
 2216         }
 2217         SCTP_IPI_ADDR_RUNLOCK();
 2218         return (m_at);
 2219 }
 2220 
 2221 static struct sctp_ifa *
 2222 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 2223     uint8_t dest_is_loop,
 2224     uint8_t dest_is_priv,
 2225     sa_family_t fam)
 2226 {
 2227         uint8_t dest_is_global = 0;
 2228 
 2229         /* dest_is_priv is true if destination is a private address */
 2230         /* dest_is_loop is true if destination is a loopback addresses */
 2231 
 2232         /**
 2233          * Here we determine if its a preferred address. A preferred address
 2234          * means it is the same scope or higher scope then the destination.
 2235          * L = loopback, P = private, G = global
 2236          * -----------------------------------------
 2237          *    src    |  dest | result
 2238          *  ----------------------------------------
 2239          *     L     |    L  |    yes
 2240          *  -----------------------------------------
 2241          *     P     |    L  |    yes-v4 no-v6
 2242          *  -----------------------------------------
 2243          *     G     |    L  |    yes-v4 no-v6
 2244          *  -----------------------------------------
 2245          *     L     |    P  |    no
 2246          *  -----------------------------------------
 2247          *     P     |    P  |    yes
 2248          *  -----------------------------------------
 2249          *     G     |    P  |    no
 2250          *   -----------------------------------------
 2251          *     L     |    G  |    no
 2252          *   -----------------------------------------
 2253          *     P     |    G  |    no
 2254          *    -----------------------------------------
 2255          *     G     |    G  |    yes
 2256          *    -----------------------------------------
 2257          */
 2258 
 2259         if (ifa->address.sa.sa_family != fam) {
 2260                 /* forget mis-matched family */
 2261                 return (NULL);
 2262         }
 2263         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 2264                 dest_is_global = 1;
 2265         }
 2266         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 2267         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 2268         /* Ok the address may be ok */
 2269 #ifdef INET6
 2270         if (fam == AF_INET6) {
 2271                 /* ok to use deprecated addresses? no lets not! */
 2272                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2273                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 2274                         return (NULL);
 2275                 }
 2276                 if (ifa->src_is_priv && !ifa->src_is_loop) {
 2277                         if (dest_is_loop) {
 2278                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 2279                                 return (NULL);
 2280                         }
 2281                 }
 2282                 if (ifa->src_is_glob) {
 2283                         if (dest_is_loop) {
 2284                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 2285                                 return (NULL);
 2286                         }
 2287                 }
 2288         }
 2289 #endif
 2290         /*
 2291          * Now that we know what is what, implement or table this could in
 2292          * theory be done slicker (it used to be), but this is
 2293          * straightforward and easier to validate :-)
 2294          */
 2295         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 2296             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 2297         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 2298             dest_is_loop, dest_is_priv, dest_is_global);
 2299 
 2300         if ((ifa->src_is_loop) && (dest_is_priv)) {
 2301                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 2302                 return (NULL);
 2303         }
 2304         if ((ifa->src_is_glob) && (dest_is_priv)) {
 2305                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 2306                 return (NULL);
 2307         }
 2308         if ((ifa->src_is_loop) && (dest_is_global)) {
 2309                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 2310                 return (NULL);
 2311         }
 2312         if ((ifa->src_is_priv) && (dest_is_global)) {
 2313                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 2314                 return (NULL);
 2315         }
 2316         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 2317         /* its a preferred address */
 2318         return (ifa);
 2319 }
 2320 
 2321 static struct sctp_ifa *
 2322 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 2323     uint8_t dest_is_loop,
 2324     uint8_t dest_is_priv,
 2325     sa_family_t fam)
 2326 {
 2327         uint8_t dest_is_global = 0;
 2328 
 2329         /**
 2330          * Here we determine if its a acceptable address. A acceptable
 2331          * address means it is the same scope or higher scope but we can
 2332          * allow for NAT which means its ok to have a global dest and a
 2333          * private src.
 2334          *
 2335          * L = loopback, P = private, G = global
 2336          * -----------------------------------------
 2337          *  src    |  dest | result
 2338          * -----------------------------------------
 2339          *   L     |   L   |    yes
 2340          *  -----------------------------------------
 2341          *   P     |   L   |    yes-v4 no-v6
 2342          *  -----------------------------------------
 2343          *   G     |   L   |    yes
 2344          * -----------------------------------------
 2345          *   L     |   P   |    no
 2346          * -----------------------------------------
 2347          *   P     |   P   |    yes
 2348          * -----------------------------------------
 2349          *   G     |   P   |    yes - May not work
 2350          * -----------------------------------------
 2351          *   L     |   G   |    no
 2352          * -----------------------------------------
 2353          *   P     |   G   |    yes - May not work
 2354          * -----------------------------------------
 2355          *   G     |   G   |    yes
 2356          * -----------------------------------------
 2357          */
 2358 
 2359         if (ifa->address.sa.sa_family != fam) {
 2360                 /* forget non matching family */
 2361                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
 2362                     ifa->address.sa.sa_family, fam);
 2363                 return (NULL);
 2364         }
 2365         /* Ok the address may be ok */
 2366         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
 2367         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
 2368             dest_is_loop, dest_is_priv);
 2369         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 2370                 dest_is_global = 1;
 2371         }
 2372 #ifdef INET6
 2373         if (fam == AF_INET6) {
 2374                 /* ok to use deprecated addresses? */
 2375                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2376                         return (NULL);
 2377                 }
 2378                 if (ifa->src_is_priv) {
 2379                         /* Special case, linklocal to loop */
 2380                         if (dest_is_loop)
 2381                                 return (NULL);
 2382                 }
 2383         }
 2384 #endif
 2385         /*
 2386          * Now that we know what is what, implement our table. This could in
 2387          * theory be done slicker (it used to be), but this is
 2388          * straightforward and easier to validate :-)
 2389          */
 2390         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
 2391             ifa->src_is_loop,
 2392             dest_is_priv);
 2393         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 2394                 return (NULL);
 2395         }
 2396         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
 2397             ifa->src_is_loop,
 2398             dest_is_global);
 2399         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 2400                 return (NULL);
 2401         }
 2402         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
 2403         /* its an acceptable address */
 2404         return (ifa);
 2405 }
 2406 
 2407 int
 2408 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 2409 {
 2410         struct sctp_laddr *laddr;
 2411 
 2412         if (stcb == NULL) {
 2413                 /* There are no restrictions, no TCB :-) */
 2414                 return (0);
 2415         }
 2416         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 2417                 if (laddr->ifa == NULL) {
 2418                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2419                             __func__);
 2420                         continue;
 2421                 }
 2422                 if (laddr->ifa == ifa) {
 2423                         /* Yes it is on the list */
 2424                         return (1);
 2425                 }
 2426         }
 2427         return (0);
 2428 }
 2429 
 2430 
 2431 int
 2432 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 2433 {
 2434         struct sctp_laddr *laddr;
 2435 
 2436         if (ifa == NULL)
 2437                 return (0);
 2438         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2439                 if (laddr->ifa == NULL) {
 2440                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2441                             __func__);
 2442                         continue;
 2443                 }
 2444                 if ((laddr->ifa == ifa) && laddr->action == 0)
 2445                         /* same pointer */
 2446                         return (1);
 2447         }
 2448         return (0);
 2449 }
 2450 
 2451 
 2452 
 2453 static struct sctp_ifa *
 2454 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 2455     sctp_route_t *ro,
 2456     uint32_t vrf_id,
 2457     int non_asoc_addr_ok,
 2458     uint8_t dest_is_priv,
 2459     uint8_t dest_is_loop,
 2460     sa_family_t fam)
 2461 {
 2462         struct sctp_laddr *laddr, *starting_point;
 2463         void *ifn;
 2464         int resettotop = 0;
 2465         struct sctp_ifn *sctp_ifn;
 2466         struct sctp_ifa *sctp_ifa, *sifa;
 2467         struct sctp_vrf *vrf;
 2468         uint32_t ifn_index;
 2469 
 2470         vrf = sctp_find_vrf(vrf_id);
 2471         if (vrf == NULL)
 2472                 return (NULL);
 2473 
 2474         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2475         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2476         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2477         /*
 2478          * first question, is the ifn we will emit on in our list, if so, we
 2479          * want such an address. Note that we first looked for a preferred
 2480          * address.
 2481          */
 2482         if (sctp_ifn) {
 2483                 /* is a preferred one on the interface we route out? */
 2484                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2485 #ifdef INET
 2486                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2487                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2488                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2489                                 continue;
 2490                         }
 2491 #endif
 2492 #ifdef INET6
 2493                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2494                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2495                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2496                                 continue;
 2497                         }
 2498 #endif
 2499                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2500                             (non_asoc_addr_ok == 0))
 2501                                 continue;
 2502                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 2503                             dest_is_loop,
 2504                             dest_is_priv, fam);
 2505                         if (sifa == NULL)
 2506                                 continue;
 2507                         if (sctp_is_addr_in_ep(inp, sifa)) {
 2508                                 atomic_add_int(&sifa->refcount, 1);
 2509                                 return (sifa);
 2510                         }
 2511                 }
 2512         }
 2513         /*
 2514          * ok, now we now need to find one on the list of the addresses. We
 2515          * can't get one on the emitting interface so let's find first a
 2516          * preferred one. If not that an acceptable one otherwise... we
 2517          * return NULL.
 2518          */
 2519         starting_point = inp->next_addr_touse;
 2520 once_again:
 2521         if (inp->next_addr_touse == NULL) {
 2522                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2523                 resettotop = 1;
 2524         }
 2525         for (laddr = inp->next_addr_touse; laddr;
 2526             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2527                 if (laddr->ifa == NULL) {
 2528                         /* address has been removed */
 2529                         continue;
 2530                 }
 2531                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2532                         /* address is being deleted */
 2533                         continue;
 2534                 }
 2535                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 2536                     dest_is_priv, fam);
 2537                 if (sifa == NULL)
 2538                         continue;
 2539                 atomic_add_int(&sifa->refcount, 1);
 2540                 return (sifa);
 2541         }
 2542         if (resettotop == 0) {
 2543                 inp->next_addr_touse = NULL;
 2544                 goto once_again;
 2545         }
 2546         inp->next_addr_touse = starting_point;
 2547         resettotop = 0;
 2548 once_again_too:
 2549         if (inp->next_addr_touse == NULL) {
 2550                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2551                 resettotop = 1;
 2552         }
 2553         /* ok, what about an acceptable address in the inp */
 2554         for (laddr = inp->next_addr_touse; laddr;
 2555             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2556                 if (laddr->ifa == NULL) {
 2557                         /* address has been removed */
 2558                         continue;
 2559                 }
 2560                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2561                         /* address is being deleted */
 2562                         continue;
 2563                 }
 2564                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2565                     dest_is_priv, fam);
 2566                 if (sifa == NULL)
 2567                         continue;
 2568                 atomic_add_int(&sifa->refcount, 1);
 2569                 return (sifa);
 2570         }
 2571         if (resettotop == 0) {
 2572                 inp->next_addr_touse = NULL;
 2573                 goto once_again_too;
 2574         }
 2575         /*
 2576          * no address bound can be a source for the destination we are in
 2577          * trouble
 2578          */
 2579         return (NULL);
 2580 }
 2581 
 2582 
 2583 
 2584 static struct sctp_ifa *
 2585 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 2586     struct sctp_tcb *stcb,
 2587     sctp_route_t *ro,
 2588     uint32_t vrf_id,
 2589     uint8_t dest_is_priv,
 2590     uint8_t dest_is_loop,
 2591     int non_asoc_addr_ok,
 2592     sa_family_t fam)
 2593 {
 2594         struct sctp_laddr *laddr, *starting_point;
 2595         void *ifn;
 2596         struct sctp_ifn *sctp_ifn;
 2597         struct sctp_ifa *sctp_ifa, *sifa;
 2598         uint8_t start_at_beginning = 0;
 2599         struct sctp_vrf *vrf;
 2600         uint32_t ifn_index;
 2601 
 2602         /*
 2603          * first question, is the ifn we will emit on in our list, if so, we
 2604          * want that one.
 2605          */
 2606         vrf = sctp_find_vrf(vrf_id);
 2607         if (vrf == NULL)
 2608                 return (NULL);
 2609 
 2610         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2611         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2612         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2613 
 2614         /*
 2615          * first question, is the ifn we will emit on in our list?  If so,
 2616          * we want that one. First we look for a preferred. Second, we go
 2617          * for an acceptable.
 2618          */
 2619         if (sctp_ifn) {
 2620                 /* first try for a preferred address on the ep */
 2621                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2622 #ifdef INET
 2623                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2624                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2625                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2626                                 continue;
 2627                         }
 2628 #endif
 2629 #ifdef INET6
 2630                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2631                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2632                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2633                                 continue;
 2634                         }
 2635 #endif
 2636                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2637                                 continue;
 2638                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2639                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2640                                 if (sifa == NULL)
 2641                                         continue;
 2642                                 if (((non_asoc_addr_ok == 0) &&
 2643                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2644                                     (non_asoc_addr_ok &&
 2645                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2646                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2647                                         /* on the no-no list */
 2648                                         continue;
 2649                                 }
 2650                                 atomic_add_int(&sifa->refcount, 1);
 2651                                 return (sifa);
 2652                         }
 2653                 }
 2654                 /* next try for an acceptable address on the ep */
 2655                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2656 #ifdef INET
 2657                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2658                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2659                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2660                                 continue;
 2661                         }
 2662 #endif
 2663 #ifdef INET6
 2664                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2665                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2666                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2667                                 continue;
 2668                         }
 2669 #endif
 2670                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2671                                 continue;
 2672                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2673                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2674                                 if (sifa == NULL)
 2675                                         continue;
 2676                                 if (((non_asoc_addr_ok == 0) &&
 2677                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2678                                     (non_asoc_addr_ok &&
 2679                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2680                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2681                                         /* on the no-no list */
 2682                                         continue;
 2683                                 }
 2684                                 atomic_add_int(&sifa->refcount, 1);
 2685                                 return (sifa);
 2686                         }
 2687                 }
 2688 
 2689         }
 2690         /*
 2691          * if we can't find one like that then we must look at all addresses
 2692          * bound to pick one at first preferable then secondly acceptable.
 2693          */
 2694         starting_point = stcb->asoc.last_used_address;
 2695 sctp_from_the_top:
 2696         if (stcb->asoc.last_used_address == NULL) {
 2697                 start_at_beginning = 1;
 2698                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2699         }
 2700         /* search beginning with the last used address */
 2701         for (laddr = stcb->asoc.last_used_address; laddr;
 2702             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2703                 if (laddr->ifa == NULL) {
 2704                         /* address has been removed */
 2705                         continue;
 2706                 }
 2707                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2708                         /* address is being deleted */
 2709                         continue;
 2710                 }
 2711                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 2712                 if (sifa == NULL)
 2713                         continue;
 2714                 if (((non_asoc_addr_ok == 0) &&
 2715                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2716                     (non_asoc_addr_ok &&
 2717                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2718                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2719                         /* on the no-no list */
 2720                         continue;
 2721                 }
 2722                 stcb->asoc.last_used_address = laddr;
 2723                 atomic_add_int(&sifa->refcount, 1);
 2724                 return (sifa);
 2725         }
 2726         if (start_at_beginning == 0) {
 2727                 stcb->asoc.last_used_address = NULL;
 2728                 goto sctp_from_the_top;
 2729         }
 2730         /* now try for any higher scope than the destination */
 2731         stcb->asoc.last_used_address = starting_point;
 2732         start_at_beginning = 0;
 2733 sctp_from_the_top2:
 2734         if (stcb->asoc.last_used_address == NULL) {
 2735                 start_at_beginning = 1;
 2736                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2737         }
 2738         /* search beginning with the last used address */
 2739         for (laddr = stcb->asoc.last_used_address; laddr;
 2740             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2741                 if (laddr->ifa == NULL) {
 2742                         /* address has been removed */
 2743                         continue;
 2744                 }
 2745                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2746                         /* address is being deleted */
 2747                         continue;
 2748                 }
 2749                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2750                     dest_is_priv, fam);
 2751                 if (sifa == NULL)
 2752                         continue;
 2753                 if (((non_asoc_addr_ok == 0) &&
 2754                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2755                     (non_asoc_addr_ok &&
 2756                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2757                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2758                         /* on the no-no list */
 2759                         continue;
 2760                 }
 2761                 stcb->asoc.last_used_address = laddr;
 2762                 atomic_add_int(&sifa->refcount, 1);
 2763                 return (sifa);
 2764         }
 2765         if (start_at_beginning == 0) {
 2766                 stcb->asoc.last_used_address = NULL;
 2767                 goto sctp_from_the_top2;
 2768         }
 2769         return (NULL);
 2770 }
 2771 
 2772 static struct sctp_ifa *
 2773 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 2774     struct sctp_inpcb *inp,
 2775     struct sctp_tcb *stcb,
 2776     int non_asoc_addr_ok,
 2777     uint8_t dest_is_loop,
 2778     uint8_t dest_is_priv,
 2779     int addr_wanted,
 2780     sa_family_t fam,
 2781     sctp_route_t *ro
 2782 )
 2783 {
 2784         struct sctp_ifa *ifa, *sifa;
 2785         int num_eligible_addr = 0;
 2786 #ifdef INET6
 2787         struct sockaddr_in6 sin6, lsa6;
 2788 
 2789         if (fam == AF_INET6) {
 2790                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
 2791                 (void)sa6_recoverscope(&sin6);
 2792         }
 2793 #endif                          /* INET6 */
 2794         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2795 #ifdef INET
 2796                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2797                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2798                     &ifa->address.sin.sin_addr) != 0)) {
 2799                         continue;
 2800                 }
 2801 #endif
 2802 #ifdef INET6
 2803                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2804                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2805                     &ifa->address.sin6.sin6_addr) != 0)) {
 2806                         continue;
 2807                 }
 2808 #endif
 2809                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2810                     (non_asoc_addr_ok == 0))
 2811                         continue;
 2812                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2813                     dest_is_priv, fam);
 2814                 if (sifa == NULL)
 2815                         continue;
 2816 #ifdef INET6
 2817                 if (fam == AF_INET6 &&
 2818                     dest_is_loop &&
 2819                     sifa->src_is_loop && sifa->src_is_priv) {
 2820                         /*
 2821                          * don't allow fe80::1 to be a src on loop ::1, we
 2822                          * don't list it to the peer so we will get an
 2823                          * abort.
 2824                          */
 2825                         continue;
 2826                 }
 2827                 if (fam == AF_INET6 &&
 2828                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
 2829                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
 2830                         /*
 2831                          * link-local <-> link-local must belong to the same
 2832                          * scope.
 2833                          */
 2834                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
 2835                         (void)sa6_recoverscope(&lsa6);
 2836                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
 2837                                 continue;
 2838                         }
 2839                 }
 2840 #endif                          /* INET6 */
 2841 
 2842                 /*
 2843                  * Check if the IPv6 address matches to next-hop. In the
 2844                  * mobile case, old IPv6 address may be not deleted from the
 2845                  * interface. Then, the interface has previous and new
 2846                  * addresses.  We should use one corresponding to the
 2847                  * next-hop.  (by micchie)
 2848                  */
 2849 #ifdef INET6
 2850                 if (stcb && fam == AF_INET6 &&
 2851                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2852                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
 2853                             == 0) {
 2854                                 continue;
 2855                         }
 2856                 }
 2857 #endif
 2858 #ifdef INET
 2859                 /* Avoid topologically incorrect IPv4 address */
 2860                 if (stcb && fam == AF_INET &&
 2861                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2862                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 2863                                 continue;
 2864                         }
 2865                 }
 2866 #endif
 2867                 if (stcb) {
 2868                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2869                                 continue;
 2870                         }
 2871                         if (((non_asoc_addr_ok == 0) &&
 2872                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2873                             (non_asoc_addr_ok &&
 2874                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2875                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2876                                 /*
 2877                                  * It is restricted for some reason..
 2878                                  * probably not yet added.
 2879                                  */
 2880                                 continue;
 2881                         }
 2882                 }
 2883                 if (num_eligible_addr >= addr_wanted) {
 2884                         return (sifa);
 2885                 }
 2886                 num_eligible_addr++;
 2887         }
 2888         return (NULL);
 2889 }
 2890 
 2891 
 2892 static int
 2893 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 2894     struct sctp_inpcb *inp,
 2895     struct sctp_tcb *stcb,
 2896     int non_asoc_addr_ok,
 2897     uint8_t dest_is_loop,
 2898     uint8_t dest_is_priv,
 2899     sa_family_t fam)
 2900 {
 2901         struct sctp_ifa *ifa, *sifa;
 2902         int num_eligible_addr = 0;
 2903 
 2904         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2905 #ifdef INET
 2906                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2907                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2908                     &ifa->address.sin.sin_addr) != 0)) {
 2909                         continue;
 2910                 }
 2911 #endif
 2912 #ifdef INET6
 2913                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2914                     (stcb != NULL) &&
 2915                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2916                     &ifa->address.sin6.sin6_addr) != 0)) {
 2917                         continue;
 2918                 }
 2919 #endif
 2920                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2921                     (non_asoc_addr_ok == 0)) {
 2922                         continue;
 2923                 }
 2924                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2925                     dest_is_priv, fam);
 2926                 if (sifa == NULL) {
 2927                         continue;
 2928                 }
 2929                 if (stcb) {
 2930                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2931                                 continue;
 2932                         }
 2933                         if (((non_asoc_addr_ok == 0) &&
 2934                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2935                             (non_asoc_addr_ok &&
 2936                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2937                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2938                                 /*
 2939                                  * It is restricted for some reason..
 2940                                  * probably not yet added.
 2941                                  */
 2942                                 continue;
 2943                         }
 2944                 }
 2945                 num_eligible_addr++;
 2946         }
 2947         return (num_eligible_addr);
 2948 }
 2949 
 2950 static struct sctp_ifa *
 2951 sctp_choose_boundall(struct sctp_inpcb *inp,
 2952     struct sctp_tcb *stcb,
 2953     struct sctp_nets *net,
 2954     sctp_route_t *ro,
 2955     uint32_t vrf_id,
 2956     uint8_t dest_is_priv,
 2957     uint8_t dest_is_loop,
 2958     int non_asoc_addr_ok,
 2959     sa_family_t fam)
 2960 {
 2961         int cur_addr_num = 0, num_preferred = 0;
 2962         void *ifn;
 2963         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 2964         struct sctp_ifa *sctp_ifa, *sifa;
 2965         uint32_t ifn_index;
 2966         struct sctp_vrf *vrf;
 2967 #ifdef INET
 2968         int retried = 0;
 2969 #endif
 2970 
 2971         /*-
 2972          * For boundall we can use any address in the association.
 2973          * If non_asoc_addr_ok is set we can use any address (at least in
 2974          * theory). So we look for preferred addresses first. If we find one,
 2975          * we use it. Otherwise we next try to get an address on the
 2976          * interface, which we should be able to do (unless non_asoc_addr_ok
 2977          * is false and we are routed out that way). In these cases where we
 2978          * can't use the address of the interface we go through all the
 2979          * ifn's looking for an address we can use and fill that in. Punting
 2980          * means we send back address 0, which will probably cause problems
 2981          * actually since then IP will fill in the address of the route ifn,
 2982          * which means we probably already rejected it.. i.e. here comes an
 2983          * abort :-<.
 2984          */
 2985         vrf = sctp_find_vrf(vrf_id);
 2986         if (vrf == NULL)
 2987                 return (NULL);
 2988 
 2989         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2990         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
 2992         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2993         if (sctp_ifn == NULL) {
 2994                 /* ?? We don't have this guy ?? */
 2995                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 2996                 goto bound_all_plan_b;
 2997         }
 2998         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 2999             ifn_index, sctp_ifn->ifn_name);
 3000 
 3001         if (net) {
 3002                 cur_addr_num = net->indx_of_eligible_next_to_use;
 3003         }
 3004         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 3005             inp, stcb,
 3006             non_asoc_addr_ok,
 3007             dest_is_loop,
 3008             dest_is_priv, fam);
 3009         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 3010             num_preferred, sctp_ifn->ifn_name);
 3011         if (num_preferred == 0) {
 3012                 /*
 3013                  * no eligible addresses, we must use some other interface
 3014                  * address if we can find one.
 3015                  */
 3016                 goto bound_all_plan_b;
 3017         }
 3018         /*
 3019          * Ok we have num_eligible_addr set with how many we can use, this
 3020          * may vary from call to call due to addresses being deprecated
 3021          * etc..
 3022          */
 3023         if (cur_addr_num >= num_preferred) {
 3024                 cur_addr_num = 0;
 3025         }
 3026         /*
 3027          * select the nth address from the list (where cur_addr_num is the
 3028          * nth) and 0 is the first one, 1 is the second one etc...
 3029          */
 3030         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 3031 
 3032         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3033             dest_is_priv, cur_addr_num, fam, ro);
 3034 
 3035         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 3036         if (sctp_ifa) {
 3037                 atomic_add_int(&sctp_ifa->refcount, 1);
 3038                 if (net) {
 3039                         /* save off where the next one we will want */
 3040                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3041                 }
 3042                 return (sctp_ifa);
 3043         }
 3044         /*
 3045          * plan_b: Look at all interfaces and find a preferred address. If
 3046          * no preferred fall through to plan_c.
 3047          */
 3048 bound_all_plan_b:
 3049         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 3050         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3051                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 3052                     sctp_ifn->ifn_name);
 3053                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3054                         /* wrong base scope */
 3055                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 3056                         continue;
 3057                 }
 3058                 if ((sctp_ifn == looked_at) && looked_at) {
 3059                         /* already looked at this guy */
 3060                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 3061                         continue;
 3062                 }
 3063                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
 3064                     dest_is_loop, dest_is_priv, fam);
 3065                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3066                     "Found ifn:%p %d preferred source addresses\n",
 3067                     ifn, num_preferred);
 3068                 if (num_preferred == 0) {
 3069                         /* None on this interface. */
 3070                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
 3071                         continue;
 3072                 }
 3073                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3074                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 3075                     num_preferred, (void *)sctp_ifn, cur_addr_num);
 3076 
 3077                 /*
 3078                  * Ok we have num_eligible_addr set with how many we can
 3079                  * use, this may vary from call to call due to addresses
 3080                  * being deprecated etc..
 3081                  */
 3082                 if (cur_addr_num >= num_preferred) {
 3083                         cur_addr_num = 0;
 3084                 }
 3085                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3086                     dest_is_priv, cur_addr_num, fam, ro);
 3087                 if (sifa == NULL)
 3088                         continue;
 3089                 if (net) {
 3090                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3091                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 3092                             cur_addr_num);
 3093                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 3094                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 3096                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 3097                 }
 3098                 atomic_add_int(&sifa->refcount, 1);
 3099                 return (sifa);
 3100         }
 3101 #ifdef INET
 3102 again_with_private_addresses_allowed:
 3103 #endif
 3104         /* plan_c: do we have an acceptable address on the emit interface */
 3105         sifa = NULL;
 3106         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 3107         if (emit_ifn == NULL) {
 3108                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
 3109                 goto plan_d;
 3110         }
 3111         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
 3113 #ifdef INET
 3114                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3115                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3116                     &sctp_ifa->address.sin.sin_addr) != 0)) {
 3117                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3118                         continue;
 3119                 }
 3120 #endif
 3121 #ifdef INET6
 3122                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3123                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3124                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3125                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3126                         continue;
 3127                 }
 3128 #endif
 3129                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3130                     (non_asoc_addr_ok == 0)) {
 3131                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
 3132                         continue;
 3133                 }
 3134                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 3135                     dest_is_priv, fam);
 3136                 if (sifa == NULL) {
 3137                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
 3138                         continue;
 3139                 }
 3140                 if (stcb) {
 3141                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3142                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
 3143                                 sifa = NULL;
 3144                                 continue;
 3145                         }
 3146                         if (((non_asoc_addr_ok == 0) &&
 3147                             (sctp_is_addr_restricted(stcb, sifa))) ||
 3148                             (non_asoc_addr_ok &&
 3149                             (sctp_is_addr_restricted(stcb, sifa)) &&
 3150                             (!sctp_is_addr_pending(stcb, sifa)))) {
 3151                                 /*
 3152                                  * It is restricted for some reason..
 3153                                  * probably not yet added.
 3154                                  */
 3155                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
 3156                                 sifa = NULL;
 3157                                 continue;
 3158                         }
 3159                 }
 3160                 atomic_add_int(&sifa->refcount, 1);
 3161                 goto out;
 3162         }
 3163 plan_d:
 3164         /*
 3165          * plan_d: We are in trouble. No preferred address on the emit
 3166          * interface. And not even a preferred address on all interfaces. Go
 3167          * out and see if we can find an acceptable address somewhere
 3168          * amongst all interfaces.
 3169          */
 3170         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
 3171         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3172                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3173                         /* wrong base scope */
 3174                         continue;
 3175                 }
 3176                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3177 #ifdef INET
 3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3179                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3180                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3181                                 continue;
 3182                         }
 3183 #endif
 3184 #ifdef INET6
 3185                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3186                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3187                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3188                                 continue;
 3189                         }
 3190 #endif
 3191                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3192                             (non_asoc_addr_ok == 0))
 3193                                 continue;
 3194                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3195                             dest_is_loop,
 3196                             dest_is_priv, fam);
 3197                         if (sifa == NULL)
 3198                                 continue;
 3199                         if (stcb) {
 3200                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3201                                         sifa = NULL;
 3202                                         continue;
 3203                                 }
 3204                                 if (((non_asoc_addr_ok == 0) &&
 3205                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 3206                                     (non_asoc_addr_ok &&
 3207                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 3208                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 3209                                         /*
 3210                                          * It is restricted for some
 3211                                          * reason.. probably not yet added.
 3212                                          */
 3213                                         sifa = NULL;
 3214                                         continue;
 3215                                 }
 3216                         }
 3217                         goto out;
 3218                 }
 3219         }
 3220 #ifdef INET
 3221         if (stcb) {
 3222                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
 3223                         stcb->asoc.scope.ipv4_local_scope = 1;
 3224                         retried = 1;
 3225                         goto again_with_private_addresses_allowed;
 3226                 } else if (retried == 1) {
 3227                         stcb->asoc.scope.ipv4_local_scope = 0;
 3228                 }
 3229         }
 3230 #endif
 3231 out:
 3232 #ifdef INET
 3233         if (sifa) {
 3234                 if (retried == 1) {
 3235                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3236                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3237                                         /* wrong base scope */
 3238                                         continue;
 3239                                 }
 3240                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3241                                         struct sctp_ifa *tmp_sifa;
 3242 
 3243 #ifdef INET
 3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3245                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3246                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3247                                                 continue;
 3248                                         }
 3249 #endif
 3250 #ifdef INET6
 3251                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3252                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3253                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3254                                                 continue;
 3255                                         }
 3256 #endif
 3257                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3258                                             (non_asoc_addr_ok == 0))
 3259                                                 continue;
 3260                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3261                                             dest_is_loop,
 3262                                             dest_is_priv, fam);
 3263                                         if (tmp_sifa == NULL) {
 3264                                                 continue;
 3265                                         }
 3266                                         if (tmp_sifa == sifa) {
 3267                                                 continue;
 3268                                         }
 3269                                         if (stcb) {
 3270                                                 if (sctp_is_address_in_scope(tmp_sifa,
 3271                                                     &stcb->asoc.scope, 0) == 0) {
 3272                                                         continue;
 3273                                                 }
 3274                                                 if (((non_asoc_addr_ok == 0) &&
 3275                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
 3276                                                     (non_asoc_addr_ok &&
 3277                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
 3278                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
 3279                                                         /*
 3280                                                          * It is restricted
 3281                                                          * for some reason..
 3282                                                          * probably not yet
 3283                                                          * added.
 3284                                                          */
 3285                                                         continue;
 3286                                                 }
 3287                                         }
 3288                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
 3289                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
 3290                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
 3291                                         }
 3292                                 }
 3293                         }
 3294                 }
 3295                 atomic_add_int(&sifa->refcount, 1);
 3296         }
 3297 #endif
 3298         return (sifa);
 3299 }
 3300 
 3301 
 3302 
 3303 /* tcb may be NULL */
 3304 struct sctp_ifa *
 3305 sctp_source_address_selection(struct sctp_inpcb *inp,
 3306     struct sctp_tcb *stcb,
 3307     sctp_route_t *ro,
 3308     struct sctp_nets *net,
 3309     int non_asoc_addr_ok, uint32_t vrf_id)
 3310 {
 3311         struct sctp_ifa *answer;
 3312         uint8_t dest_is_priv, dest_is_loop;
 3313         sa_family_t fam;
 3314 #ifdef INET
 3315         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 3316 #endif
 3317 #ifdef INET6
 3318         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 3319 #endif
 3320 
 3321         /**
 3322          * Rules:
 3323          * - Find the route if needed, cache if I can.
 3324          * - Look at interface address in route, Is it in the bound list. If so we
 3325          *   have the best source.
 3326          * - If not we must rotate amongst the addresses.
 3327          *
 3328          * Cavets and issues
 3329          *
 3330          * Do we need to pay attention to scope. We can have a private address
 3331          * or a global address we are sourcing or sending to. So if we draw
 3332          * it out
 3333          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3334          * For V4
 3335          * ------------------------------------------
 3336          *      source     *      dest  *  result
 3337          * -----------------------------------------
 3338          * <a>  Private    *    Global  *  NAT
 3339          * -----------------------------------------
 3340          * <b>  Private    *    Private *  No problem
 3341          * -----------------------------------------
 3342          * <c>  Global     *    Private *  Huh, How will this work?
 3343          * -----------------------------------------
 3344          * <d>  Global     *    Global  *  No Problem
 3345          *------------------------------------------
 3346          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3347          * For V6
 3348          *------------------------------------------
 3349          *      source     *      dest  *  result
 3350          * -----------------------------------------
 3351          * <a>  Linklocal  *    Global  *
 3352          * -----------------------------------------
 3353          * <b>  Linklocal  * Linklocal  *  No problem
 3354          * -----------------------------------------
 3355          * <c>  Global     * Linklocal  *  Huh, How will this work?
 3356          * -----------------------------------------
 3357          * <d>  Global     *    Global  *  No Problem
 3358          *------------------------------------------
 3359          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3360          *
 3361          * And then we add to that what happens if there are multiple addresses
 3362          * assigned to an interface. Remember the ifa on a ifn is a linked
 3363          * list of addresses. So one interface can have more than one IP
 3364          * address. What happens if we have both a private and a global
 3365          * address? Do we then use context of destination to sort out which
 3366          * one is best? And what about NAT's sending P->G may get you a NAT
 3367          * translation, or should you select the G thats on the interface in
 3368          * preference.
 3369          *
 3370          * Decisions:
 3371          *
 3372          * - count the number of addresses on the interface.
 3373          * - if it is one, no problem except case <c>.
 3374          *   For <a> we will assume a NAT out there.
 3375          * - if there are more than one, then we need to worry about scope P
 3376          *   or G. We should prefer G -> G and P -> P if possible.
 3377          *   Then as a secondary fall back to mixed types G->P being a last
 3378          *   ditch one.
 3379          * - The above all works for bound all, but bound specific we need to
 3380          *   use the same concept but instead only consider the bound
 3381          *   addresses. If the bound set is NOT assigned to the interface then
 3382          *   we must use rotation amongst the bound addresses..
 3383          */
 3384         if (ro->ro_rt == NULL) {
 3385                 /*
 3386                  * Need a route to cache.
 3387                  */
 3388                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 3389         }
 3390         if (ro->ro_rt == NULL) {
 3391                 return (NULL);
 3392         }
 3393         fam = ro->ro_dst.sa_family;
 3394         dest_is_priv = dest_is_loop = 0;
 3395         /* Setup our scopes for the destination */
 3396         switch (fam) {
 3397 #ifdef INET
 3398         case AF_INET:
 3399                 /* Scope based on outbound address */
 3400                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 3401                         dest_is_loop = 1;
 3402                         if (net != NULL) {
 3403                                 /* mark it as local */
 3404                                 net->addr_is_local = 1;
 3405                         }
 3406                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 3407                         dest_is_priv = 1;
 3408                 }
 3409                 break;
 3410 #endif
 3411 #ifdef INET6
 3412         case AF_INET6:
 3413                 /* Scope based on outbound address */
 3414                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
 3415                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
 3416                         /*
 3417                          * If the address is a loopback address, which
 3418                          * consists of "::1" OR "fe80::1%lo0", we are
 3419                          * loopback scope. But we don't use dest_is_priv
 3420                          * (link local addresses).
 3421                          */
 3422                         dest_is_loop = 1;
 3423                         if (net != NULL) {
 3424                                 /* mark it as local */
 3425                                 net->addr_is_local = 1;
 3426                         }
 3427                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 3428                         dest_is_priv = 1;
 3429                 }
 3430                 break;
 3431 #endif
 3432         }
 3433         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 3434         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
 3435         SCTP_IPI_ADDR_RLOCK();
 3436         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3437                 /*
 3438                  * Bound all case
 3439                  */
 3440                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 3441                     dest_is_priv, dest_is_loop,
 3442                     non_asoc_addr_ok, fam);
 3443                 SCTP_IPI_ADDR_RUNLOCK();
 3444                 return (answer);
 3445         }
 3446         /*
 3447          * Subset bound case
 3448          */
 3449         if (stcb) {
 3450                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
 3451                     vrf_id, dest_is_priv,
 3452                     dest_is_loop,
 3453                     non_asoc_addr_ok, fam);
 3454         } else {
 3455                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 3456                     non_asoc_addr_ok,
 3457                     dest_is_priv,
 3458                     dest_is_loop, fam);
 3459         }
 3460         SCTP_IPI_ADDR_RUNLOCK();
 3461         return (answer);
 3462 }
 3463 
 3464 static int
 3465 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
 3466 {
 3467         struct cmsghdr cmh;
 3468         int tlen, at, found;
 3469         struct sctp_sndinfo sndinfo;
 3470         struct sctp_prinfo prinfo;
 3471         struct sctp_authinfo authinfo;
 3472 
 3473         tlen = SCTP_BUF_LEN(control);
 3474         at = 0;
 3475         found = 0;
 3476         /*
 3477          * Independent of how many mbufs, find the c_type inside the control
 3478          * structure and copy out the data.
 3479          */
 3480         while (at < tlen) {
 3481                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3482                         /* There is not enough room for one more. */
 3483                         return (found);
 3484                 }
 3485                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3486                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3487                         /* We dont't have a complete CMSG header. */
 3488                         return (found);
 3489                 }
 3490                 if (((int)cmh.cmsg_len + at) > tlen) {
 3491                         /* We don't have the complete CMSG. */
 3492                         return (found);
 3493                 }
 3494                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 3495                     ((c_type == cmh.cmsg_type) ||
 3496                     ((c_type == SCTP_SNDRCV) &&
 3497                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
 3498                     (cmh.cmsg_type == SCTP_PRINFO) ||
 3499                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
 3500                         if (c_type == cmh.cmsg_type) {
 3501                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
 3502                                         return (found);
 3503                                 }
 3504                                 /* It is exactly what we want. Copy it out. */
 3505                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), (int)cpsize, (caddr_t)data);
 3506                                 return (1);
 3507                         } else {
 3508                                 struct sctp_sndrcvinfo *sndrcvinfo;
 3509 
 3510                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
 3511                                 if (found == 0) {
 3512                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
 3513                                                 return (found);
 3514                                         }
 3515                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
 3516                                 }
 3517                                 switch (cmh.cmsg_type) {
 3518                                 case SCTP_SNDINFO:
 3519                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
 3520                                                 return (found);
 3521                                         }
 3522                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
 3523                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
 3524                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
 3525                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
 3526                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
 3527                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
 3528                                         break;
 3529                                 case SCTP_PRINFO:
 3530                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
 3531                                                 return (found);
 3532                                         }
 3533                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
 3534                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
 3535                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
 3536                                         } else {
 3537                                                 sndrcvinfo->sinfo_timetolive = 0;
 3538                                         }
 3539                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
 3540                                         break;
 3541                                 case SCTP_AUTHINFO:
 3542                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
 3543                                                 return (found);
 3544                                         }
 3545                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
 3546                                         sndrcvinfo->sinfo_keynumber_valid = 1;
 3547                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
 3548                                         break;
 3549                                 default:
 3550                                         return (found);
 3551                                 }
 3552                                 found = 1;
 3553                         }
 3554                 }
 3555                 at += CMSG_ALIGN(cmh.cmsg_len);
 3556         }
 3557         return (found);
 3558 }
 3559 
 3560 static int
 3561 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
 3562 {
 3563         struct cmsghdr cmh;
 3564         int tlen, at;
 3565         struct sctp_initmsg initmsg;
 3566 #ifdef INET
 3567         struct sockaddr_in sin;
 3568 #endif
 3569 #ifdef INET6
 3570         struct sockaddr_in6 sin6;
 3571 #endif
 3572 
 3573         tlen = SCTP_BUF_LEN(control);
 3574         at = 0;
 3575         while (at < tlen) {
 3576                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3577                         /* There is not enough room for one more. */
 3578                         *error = EINVAL;
 3579                         return (1);
 3580                 }
 3581                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3582                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3583                         /* We dont't have a complete CMSG header. */
 3584                         *error = EINVAL;
 3585                         return (1);
 3586                 }
 3587                 if (((int)cmh.cmsg_len + at) > tlen) {
 3588                         /* We don't have the complete CMSG. */
 3589                         *error = EINVAL;
 3590                         return (1);
 3591                 }
 3592                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3593                         switch (cmh.cmsg_type) {
 3594                         case SCTP_INIT:
 3595                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
 3596                                         *error = EINVAL;
 3597                                         return (1);
 3598                                 }
 3599                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
 3600                                 if (initmsg.sinit_max_attempts)
 3601                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
 3602                                 if (initmsg.sinit_num_ostreams)
 3603                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
 3604                                 if (initmsg.sinit_max_instreams)
 3605                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
 3606                                 if (initmsg.sinit_max_init_timeo)
 3607                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
 3608                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
 3609                                         struct sctp_stream_out *tmp_str;
 3610                                         unsigned int i;
 3611 #if defined(SCTP_DETAILED_STR_STATS)
 3612                                         int j;
 3613 #endif
 3614 
 3615                                         /* Default is NOT correct */
 3616                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
 3617                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
 3618                                         SCTP_TCB_UNLOCK(stcb);
 3619                                         SCTP_MALLOC(tmp_str,
 3620                                             struct sctp_stream_out *,
 3621                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
 3622                                             SCTP_M_STRMO);
 3623                                         SCTP_TCB_LOCK(stcb);
 3624                                         if (tmp_str != NULL) {
 3625                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
 3626                                                 stcb->asoc.strmout = tmp_str;
 3627                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
 3628                                         } else {
 3629                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
 3630                                         }
 3631                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3632                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
 3633                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
 3634                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
 3635                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
 3636 #if defined(SCTP_DETAILED_STR_STATS)
 3637                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 3638                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
 3639                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
 3640                                                 }
 3641 #else
 3642                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
 3643                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
 3644 #endif
 3645                                                 stcb->asoc.strmout[i].sid = i;
 3646                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
 3647                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
 3648                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
 3649                                         }
 3650                                 }
 3651                                 break;
 3652 #ifdef INET
 3653                         case SCTP_DSTADDRV4:
 3654                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
 3655                                         *error = EINVAL;
 3656                                         return (1);
 3657                                 }
 3658                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3659                                 sin.sin_family = AF_INET;
 3660                                 sin.sin_len = sizeof(struct sockaddr_in);
 3661                                 sin.sin_port = stcb->rport;
 3662                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3663                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3664                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3665                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3666                                         *error = EINVAL;
 3667                                         return (1);
 3668                                 }
 3669                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3670                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3671                                         *error = ENOBUFS;
 3672                                         return (1);
 3673                                 }
 3674                                 break;
 3675 #endif
 3676 #ifdef INET6
 3677                         case SCTP_DSTADDRV6:
 3678                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
 3679                                         *error = EINVAL;
 3680                                         return (1);
 3681                                 }
 3682                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3683                                 sin6.sin6_family = AF_INET6;
 3684                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3685                                 sin6.sin6_port = stcb->rport;
 3686                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3687                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
 3688                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
 3689                                         *error = EINVAL;
 3690                                         return (1);
 3691                                 }
 3692 #ifdef INET
 3693                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3694                                         in6_sin6_2_sin(&sin, &sin6);
 3695                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3696                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3697                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3698                                                 *error = EINVAL;
 3699                                                 return (1);
 3700                                         }
 3701                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3702                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3703                                                 *error = ENOBUFS;
 3704                                                 return (1);
 3705                                         }
 3706                                 } else
 3707 #endif
 3708                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
 3709                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3710                                         *error = ENOBUFS;
 3711                                         return (1);
 3712                                 }
 3713                                 break;
 3714 #endif
 3715                         default:
 3716                                 break;
 3717                         }
 3718                 }
 3719                 at += CMSG_ALIGN(cmh.cmsg_len);
 3720         }
 3721         return (0);
 3722 }
 3723 
 3724 static struct sctp_tcb *
 3725 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
 3726     uint16_t port,
 3727     struct mbuf *control,
 3728     struct sctp_nets **net_p,
 3729     int *error)
 3730 {
 3731         struct cmsghdr cmh;
 3732         int tlen, at;
 3733         struct sctp_tcb *stcb;
 3734         struct sockaddr *addr;
 3735 #ifdef INET
 3736         struct sockaddr_in sin;
 3737 #endif
 3738 #ifdef INET6
 3739         struct sockaddr_in6 sin6;
 3740 #endif
 3741 
 3742         tlen = SCTP_BUF_LEN(control);
 3743         at = 0;
 3744         while (at < tlen) {
 3745                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3746                         /* There is not enough room for one more. */
 3747                         *error = EINVAL;
 3748                         return (NULL);
 3749                 }
 3750                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3751                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3752                         /* We dont't have a complete CMSG header. */
 3753                         *error = EINVAL;
 3754                         return (NULL);
 3755                 }
 3756                 if (((int)cmh.cmsg_len + at) > tlen) {
 3757                         /* We don't have the complete CMSG. */
 3758                         *error = EINVAL;
 3759                         return (NULL);
 3760                 }
 3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3762                         switch (cmh.cmsg_type) {
 3763 #ifdef INET
 3764                         case SCTP_DSTADDRV4:
 3765                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
 3766                                         *error = EINVAL;
 3767                                         return (NULL);
 3768                                 }
 3769                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3770                                 sin.sin_family = AF_INET;
 3771                                 sin.sin_len = sizeof(struct sockaddr_in);
 3772                                 sin.sin_port = port;
 3773                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3774                                 addr = (struct sockaddr *)&sin;
 3775                                 break;
 3776 #endif
 3777 #ifdef INET6
 3778                         case SCTP_DSTADDRV6:
 3779                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
 3780                                         *error = EINVAL;
 3781                                         return (NULL);
 3782                                 }
 3783                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3784                                 sin6.sin6_family = AF_INET6;
 3785                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3786                                 sin6.sin6_port = port;
 3787                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3788 #ifdef INET
 3789                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3790                                         in6_sin6_2_sin(&sin, &sin6);
 3791                                         addr = (struct sockaddr *)&sin;
 3792                                 } else
 3793 #endif
 3794                                         addr = (struct sockaddr *)&sin6;
 3795                                 break;
 3796 #endif
 3797                         default:
 3798                                 addr = NULL;
 3799                                 break;
 3800                         }
 3801                         if (addr) {
 3802                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
 3803                                 if (stcb != NULL) {
 3804                                         return (stcb);
 3805                                 }
 3806                         }
 3807                 }
 3808                 at += CMSG_ALIGN(cmh.cmsg_len);
 3809         }
 3810         return (NULL);
 3811 }
 3812 
 3813 static struct mbuf *
 3814 sctp_add_cookie(struct mbuf *init, int init_offset,
 3815     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t **signature)
 3816 {
 3817         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
 3818         struct sctp_state_cookie *stc;
 3819         struct sctp_paramhdr *ph;
 3820         uint8_t *foo;
 3821         int sig_offset;
 3822         uint16_t cookie_sz;
 3823 
 3824         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 3825             sizeof(struct sctp_paramhdr)), 0,
 3826             M_NOWAIT, 1, MT_DATA);
 3827         if (mret == NULL) {
 3828                 return (NULL);
 3829         }
 3830         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
 3831         if (copy_init == NULL) {
 3832                 sctp_m_freem(mret);
 3833                 return (NULL);
 3834         }
 3835 #ifdef SCTP_MBUF_LOGGING
 3836         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3837                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
 3838         }
 3839 #endif
 3840         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 3841             M_NOWAIT);
 3842         if (copy_initack == NULL) {
 3843                 sctp_m_freem(mret);
 3844                 sctp_m_freem(copy_init);
 3845                 return (NULL);
 3846         }
 3847 #ifdef SCTP_MBUF_LOGGING
 3848         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3849                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
 3850         }
 3851 #endif
 3852         /* easy side we just drop it on the end */
 3853         ph = mtod(mret, struct sctp_paramhdr *);
 3854         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 3855             sizeof(struct sctp_paramhdr);
 3856         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 3857             sizeof(struct sctp_paramhdr));
 3858         ph->param_type = htons(SCTP_STATE_COOKIE);
 3859         ph->param_length = 0;   /* fill in at the end */
 3860         /* Fill in the stc cookie data */
 3861         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 3862 
 3863         /* tack the INIT and then the INIT-ACK onto the chain */
 3864         cookie_sz = 0;
 3865         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3866                 cookie_sz += SCTP_BUF_LEN(m_at);
 3867                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3868                         SCTP_BUF_NEXT(m_at) = copy_init;
 3869                         break;
 3870                 }
 3871         }
 3872         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3873                 cookie_sz += SCTP_BUF_LEN(m_at);
 3874                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3875                         SCTP_BUF_NEXT(m_at) = copy_initack;
 3876                         break;
 3877                 }
 3878         }
 3879         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3880                 cookie_sz += SCTP_BUF_LEN(m_at);
 3881                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3882                         break;
 3883                 }
 3884         }
 3885         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
 3886         if (sig == NULL) {
 3887                 /* no space, so free the entire chain */
 3888                 sctp_m_freem(mret);
 3889                 return (NULL);
 3890         }
 3891         SCTP_BUF_LEN(sig) = 0;
 3892         SCTP_BUF_NEXT(m_at) = sig;
 3893         sig_offset = 0;
 3894         foo = (uint8_t *)(mtod(sig, caddr_t)+sig_offset);
 3895         memset(foo, 0, SCTP_SIGNATURE_SIZE);
 3896         *signature = foo;
 3897         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
 3898         cookie_sz += SCTP_SIGNATURE_SIZE;
 3899         ph->param_length = htons(cookie_sz);
 3900         return (mret);
 3901 }
 3902 
 3903 
 3904 static uint8_t
 3905 sctp_get_ect(struct sctp_tcb *stcb)
 3906 {
 3907         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
 3908                 return (SCTP_ECT0_BIT);
 3909         } else {
 3910                 return (0);
 3911         }
 3912 }
 3913 
 3914 #if defined(INET) || defined(INET6)
 3915 static void
 3916 sctp_handle_no_route(struct sctp_tcb *stcb,
 3917     struct sctp_nets *net,
 3918     int so_locked)
 3919 {
 3920         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
 3921 
 3922         if (net) {
 3923                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
 3924                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
 3925                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 3926                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 3927                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
 3928                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 3929                                     stcb, 0,
 3930                                     (void *)net,
 3931                                     so_locked);
 3932                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 3933                                 net->dest_state &= ~SCTP_ADDR_PF;
 3934                         }
 3935                 }
 3936                 if (stcb) {
 3937                         if (net == stcb->asoc.primary_destination) {
 3938                                 /* need a new primary */
 3939                                 struct sctp_nets *alt;
 3940 
 3941                                 alt = sctp_find_alternate_net(stcb, net, 0);
 3942                                 if (alt != net) {
 3943                                         if (stcb->asoc.alternate) {
 3944                                                 sctp_free_remote_addr(stcb->asoc.alternate);
 3945                                         }
 3946                                         stcb->asoc.alternate = alt;
 3947                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 3948                                         if (net->ro._s_addr) {
 3949                                                 sctp_free_ifa(net->ro._s_addr);
 3950                                                 net->ro._s_addr = NULL;
 3951                                         }
 3952                                         net->src_addr_selected = 0;
 3953                                 }
 3954                         }
 3955                 }
 3956         }
 3957 }
 3958 #endif
 3959 
 3960 static int
 3961 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 3962     struct sctp_tcb *stcb,      /* may be NULL */
 3963     struct sctp_nets *net,
 3964     struct sockaddr *to,
 3965     struct mbuf *m,
 3966     uint32_t auth_offset,
 3967     struct sctp_auth_chunk *auth,
 3968     uint16_t auth_keyid,
 3969     int nofragment_flag,
 3970     int ecn_ok,
 3971     int out_of_asoc_ok,
 3972     uint16_t src_port,
 3973     uint16_t dest_port,
 3974     uint32_t v_tag,
 3975     uint16_t port,
 3976     union sctp_sockstore *over_addr,
 3977     uint8_t mflowtype, uint32_t mflowid,
 3978 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 3979     int so_locked SCTP_UNUSED
 3980 #else
 3981     int so_locked
 3982 #endif
 3983 )
 3984 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 3985 {
 3986         /**
 3987          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
 3988          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
 3989          * - fill in the HMAC digest of any AUTH chunk in the packet.
 3990          * - calculate and fill in the SCTP checksum.
 3991          * - prepend an IP address header.
 3992          * - if boundall use INADDR_ANY.
 3993          * - if boundspecific do source address selection.
 3994          * - set fragmentation option for ipV4.
 3995          * - On return from IP output, check/adjust mtu size of output
 3996          *   interface and smallest_mtu size as well.
 3997          */
 3998         /* Will need ifdefs around this */
 3999         struct mbuf *newm;
 4000         struct sctphdr *sctphdr;
 4001         int packet_length;
 4002         int ret;
 4003 #if defined(INET) || defined(INET6)
 4004         uint32_t vrf_id;
 4005 #endif
 4006 #if defined(INET) || defined(INET6)
 4007         struct mbuf *o_pak;
 4008         sctp_route_t *ro = NULL;
 4009         struct udphdr *udp = NULL;
 4010 #endif
 4011         uint8_t tos_value;
 4012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4013         struct socket *so = NULL;
 4014 #endif
 4015 
 4016         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 4017                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4018                 sctp_m_freem(m);
 4019                 return (EFAULT);
 4020         }
 4021 #if defined(INET) || defined(INET6)
 4022         if (stcb) {
 4023                 vrf_id = stcb->asoc.vrf_id;
 4024         } else {
 4025                 vrf_id = inp->def_vrf_id;
 4026         }
 4027 #endif
 4028         /* fill in the HMAC digest for any AUTH chunk in the packet */
 4029         if ((auth != NULL) && (stcb != NULL)) {
 4030                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
 4031         }
 4032         if (net) {
 4033                 tos_value = net->dscp;
 4034         } else if (stcb) {
 4035                 tos_value = stcb->asoc.default_dscp;
 4036         } else {
 4037                 tos_value = inp->sctp_ep.default_dscp;
 4038         }
 4039 
 4040         switch (to->sa_family) {
 4041 #ifdef INET
 4042         case AF_INET:
 4043                 {
 4044                         struct ip *ip = NULL;
 4045                         sctp_route_t iproute;
 4046                         int len;
 4047 
 4048                         len = SCTP_MIN_V4_OVERHEAD;
 4049                         if (port) {
 4050                                 len += sizeof(struct udphdr);
 4051                         }
 4052                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4053                         if (newm == NULL) {
 4054                                 sctp_m_freem(m);
 4055                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4056                                 return (ENOMEM);
 4057                         }
 4058                         SCTP_ALIGN_TO_END(newm, len);
 4059                         SCTP_BUF_LEN(newm) = len;
 4060                         SCTP_BUF_NEXT(newm) = m;
 4061                         m = newm;
 4062                         if (net != NULL) {
 4063                                 m->m_pkthdr.flowid = net->flowid;
 4064                                 M_HASHTYPE_SET(m, net->flowtype);
 4065                         } else {
 4066                                 m->m_pkthdr.flowid = mflowid;
 4067                                 M_HASHTYPE_SET(m, mflowtype);
 4068                         }
 4069                         packet_length = sctp_calculate_len(m);
 4070                         ip = mtod(m, struct ip *);
 4071                         ip->ip_v = IPVERSION;
 4072                         ip->ip_hl = (sizeof(struct ip) >> 2);
 4073                         if (tos_value == 0) {
 4074                                 /*
 4075                                  * This means especially, that it is not set
 4076                                  * at the SCTP layer. So use the value from
 4077                                  * the IP layer.
 4078                                  */
 4079                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
 4080                         }
 4081                         tos_value &= 0xfc;
 4082                         if (ecn_ok) {
 4083                                 tos_value |= sctp_get_ect(stcb);
 4084                         }
 4085                         if ((nofragment_flag) && (port == 0)) {
 4086                                 ip->ip_off = htons(IP_DF);
 4087                         } else {
 4088                                 ip->ip_off = htons(0);
 4089                         }
 4090                         /* FreeBSD has a function for ip_id's */
 4091                         ip_fillid(ip);
 4092 
 4093                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 4094                         ip->ip_len = htons(packet_length);
 4095                         ip->ip_tos = tos_value;
 4096                         if (port) {
 4097                                 ip->ip_p = IPPROTO_UDP;
 4098                         } else {
 4099                                 ip->ip_p = IPPROTO_SCTP;
 4100                         }
 4101                         ip->ip_sum = 0;
 4102                         if (net == NULL) {
 4103                                 ro = &iproute;
 4104                                 memset(&iproute, 0, sizeof(iproute));
 4105                                 memcpy(&ro->ro_dst, to, to->sa_len);
 4106                         } else {
 4107                                 ro = (sctp_route_t *)&net->ro;
 4108                         }
 4109                         /* Now the address selection part */
 4110                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 4111 
 4112                         /* call the routine to select the src address */
 4113                         if (net && out_of_asoc_ok == 0) {
 4114                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4115                                         sctp_free_ifa(net->ro._s_addr);
 4116                                         net->ro._s_addr = NULL;
 4117                                         net->src_addr_selected = 0;
 4118                                         if (ro->ro_rt) {
 4119                                                 RTFREE(ro->ro_rt);
 4120                                                 ro->ro_rt = NULL;
 4121                                         }
 4122                                 }
 4123                                 if (net->src_addr_selected == 0) {
 4124                                         /* Cache the source address */
 4125                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 4126                                             ro, net, 0,
 4127                                             vrf_id);
 4128                                         net->src_addr_selected = 1;
 4129                                 }
 4130                                 if (net->ro._s_addr == NULL) {
 4131                                         /* No route to host */
 4132                                         net->src_addr_selected = 0;
 4133                                         sctp_handle_no_route(stcb, net, so_locked);
 4134                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4135                                         sctp_m_freem(m);
 4136                                         return (EHOSTUNREACH);
 4137                                 }
 4138                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 4139                         } else {
 4140                                 if (over_addr == NULL) {
 4141                                         struct sctp_ifa *_lsrc;
 4142 
 4143                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4144                                             net,
 4145                                             out_of_asoc_ok,
 4146                                             vrf_id);
 4147                                         if (_lsrc == NULL) {
 4148                                                 sctp_handle_no_route(stcb, net, so_locked);
 4149                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4150                                                 sctp_m_freem(m);
 4151                                                 return (EHOSTUNREACH);
 4152                                         }
 4153                                         ip->ip_src = _lsrc->address.sin.sin_addr;
 4154                                         sctp_free_ifa(_lsrc);
 4155                                 } else {
 4156                                         ip->ip_src = over_addr->sin.sin_addr;
 4157                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4158                                 }
 4159                         }
 4160                         if (port) {
 4161                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 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                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
 4168                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4169                                 udp->uh_dport = port;
 4170                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
 4171                                 if (V_udp_cksum) {
 4172                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
 4173                                 } else {
 4174                                         udp->uh_sum = 0;
 4175                                 }
 4176                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4177                         } else {
 4178                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
 4179                         }
 4180 
 4181                         sctphdr->src_port = src_port;
 4182                         sctphdr->dest_port = dest_port;
 4183                         sctphdr->v_tag = v_tag;
 4184                         sctphdr->checksum = 0;
 4185 
 4186                         /*
 4187                          * If source address selection fails and we find no
 4188                          * route then the ip_output should fail as well with
 4189                          * a NO_ROUTE_TO_HOST type error. We probably should
 4190                          * catch that somewhere and abort the association
 4191                          * right away (assuming this is an INIT being sent).
 4192                          */
 4193                         if (ro->ro_rt == NULL) {
 4194                                 /*
 4195                                  * src addr selection failed to find a route
 4196                                  * (or valid source addr), so we can't get
 4197                                  * there from here (yet)!
 4198                                  */
 4199                                 sctp_handle_no_route(stcb, net, so_locked);
 4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4201                                 sctp_m_freem(m);
 4202                                 return (EHOSTUNREACH);
 4203                         }
 4204                         if (ro != &iproute) {
 4205                                 memcpy(&iproute, ro, sizeof(*ro));
 4206                         }
 4207                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 4208                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
 4209                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 4210                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
 4211                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 4212                             (void *)ro->ro_rt);
 4213 
 4214                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4215                                 /* failed to prepend data, give up */
 4216                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4217                                 sctp_m_freem(m);
 4218                                 return (ENOMEM);
 4219                         }
 4220                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4221                         if (port) {
 4222 #if defined(SCTP_WITH_NO_CSUM)
 4223                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4224 #else
 4225                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
 4226                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4227 #endif
 4228                                 if (V_udp_cksum) {
 4229                                         SCTP_ENABLE_UDP_CSUM(o_pak);
 4230                                 }
 4231                         } else {
 4232 #if defined(SCTP_WITH_NO_CSUM)
 4233                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4234 #else
 4235                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
 4236                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4237                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4238 #endif
 4239                         }
 4240 #ifdef SCTP_PACKET_LOGGING
 4241                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4242                                 sctp_packet_log(o_pak);
 4243 #endif
 4244                         /* send it out.  table id is taken from stcb */
 4245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4246                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4247                                 so = SCTP_INP_SO(inp);
 4248                                 SCTP_SOCKET_UNLOCK(so, 0);
 4249                         }
 4250 #endif
 4251                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
 4252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4253                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4254                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4255                                 SCTP_TCB_UNLOCK(stcb);
 4256                                 SCTP_SOCKET_LOCK(so, 0);
 4257                                 SCTP_TCB_LOCK(stcb);
 4258                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4259                         }
 4260 #endif
 4261                         SCTP_STAT_INCR(sctps_sendpackets);
 4262                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4263                         if (ret)
 4264                                 SCTP_STAT_INCR(sctps_senderrors);
 4265 
 4266                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 4267                         if (net == NULL) {
 4268                                 /* free tempy routes */
 4269                                 RO_RTFREE(ro);
 4270                         } else {
 4271                                 /*
 4272                                  * PMTU check versus smallest asoc MTU goes
 4273                                  * here
 4274                                  */
 4275                                 if ((ro->ro_rt != NULL) &&
 4276                                     (net->ro._s_addr)) {
 4277                                         uint32_t mtu;
 4278 
 4279                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4280                                         if (net->port) {
 4281                                                 mtu -= sizeof(struct udphdr);
 4282                                         }
 4283                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
 4284                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4285                                                 net->mtu = mtu;
 4286                                         }
 4287                                 } else if (ro->ro_rt == NULL) {
 4288                                         /* route was freed */
 4289                                         if (net->ro._s_addr &&
 4290                                             net->src_addr_selected) {
 4291                                                 sctp_free_ifa(net->ro._s_addr);
 4292                                                 net->ro._s_addr = NULL;
 4293                                         }
 4294                                         net->src_addr_selected = 0;
 4295                                 }
 4296                         }
 4297                         return (ret);
 4298                 }
 4299 #endif
 4300 #ifdef INET6
 4301         case AF_INET6:
 4302                 {
 4303                         uint32_t flowlabel, flowinfo;
 4304                         struct ip6_hdr *ip6h;
 4305                         struct route_in6 ip6route;
 4306                         struct ifnet *ifp;
 4307                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 4308                         int prev_scope = 0;
 4309                         struct sockaddr_in6 lsa6_storage;
 4310                         int error;
 4311                         u_short prev_port = 0;
 4312                         int len;
 4313 
 4314                         if (net) {
 4315                                 flowlabel = net->flowlabel;
 4316                         } else if (stcb) {
 4317                                 flowlabel = stcb->asoc.default_flowlabel;
 4318                         } else {
 4319                                 flowlabel = inp->sctp_ep.default_flowlabel;
 4320                         }
 4321                         if (flowlabel == 0) {
 4322                                 /*
 4323                                  * This means especially, that it is not set
 4324                                  * at the SCTP layer. So use the value from
 4325                                  * the IP layer.
 4326                                  */
 4327                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
 4328                         }
 4329                         flowlabel &= 0x000fffff;
 4330                         len = SCTP_MIN_OVERHEAD;
 4331                         if (port) {
 4332                                 len += sizeof(struct udphdr);
 4333                         }
 4334                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4335                         if (newm == NULL) {
 4336                                 sctp_m_freem(m);
 4337                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4338                                 return (ENOMEM);
 4339                         }
 4340                         SCTP_ALIGN_TO_END(newm, len);
 4341                         SCTP_BUF_LEN(newm) = len;
 4342                         SCTP_BUF_NEXT(newm) = m;
 4343                         m = newm;
 4344                         if (net != NULL) {
 4345                                 m->m_pkthdr.flowid = net->flowid;
 4346                                 M_HASHTYPE_SET(m, net->flowtype);
 4347                         } else {
 4348                                 m->m_pkthdr.flowid = mflowid;
 4349                                 M_HASHTYPE_SET(m, mflowtype);
 4350                         }
 4351                         packet_length = sctp_calculate_len(m);
 4352 
 4353                         ip6h = mtod(m, struct ip6_hdr *);
 4354                         /* protect *sin6 from overwrite */
 4355                         sin6 = (struct sockaddr_in6 *)to;
 4356                         tmp = *sin6;
 4357                         sin6 = &tmp;
 4358 
 4359                         /* KAME hack: embed scopeid */
 4360                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4361                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4362                                 return (EINVAL);
 4363                         }
 4364                         if (net == NULL) {
 4365                                 memset(&ip6route, 0, sizeof(ip6route));
 4366                                 ro = (sctp_route_t *)&ip6route;
 4367                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 4368                         } else {
 4369                                 ro = (sctp_route_t *)&net->ro;
 4370                         }
 4371                         /*
 4372                          * We assume here that inp_flow is in host byte
 4373                          * order within the TCB!
 4374                          */
 4375                         if (tos_value == 0) {
 4376                                 /*
 4377                                  * This means especially, that it is not set
 4378                                  * at the SCTP layer. So use the value from
 4379                                  * the IP layer.
 4380                                  */
 4381                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
 4382                         }
 4383                         tos_value &= 0xfc;
 4384                         if (ecn_ok) {
 4385                                 tos_value |= sctp_get_ect(stcb);
 4386                         }
 4387                         flowinfo = 0x06;
 4388                         flowinfo <<= 8;
 4389                         flowinfo |= tos_value;
 4390                         flowinfo <<= 20;
 4391                         flowinfo |= flowlabel;
 4392                         ip6h->ip6_flow = htonl(flowinfo);
 4393                         if (port) {
 4394                                 ip6h->ip6_nxt = IPPROTO_UDP;
 4395                         } else {
 4396                                 ip6h->ip6_nxt = IPPROTO_SCTP;
 4397                         }
 4398                         ip6h->ip6_plen = (uint16_t)(packet_length - sizeof(struct ip6_hdr));
 4399                         ip6h->ip6_dst = sin6->sin6_addr;
 4400 
 4401                         /*
 4402                          * Add SRC address selection here: we can only reuse
 4403                          * to a limited degree the kame src-addr-sel, since
 4404                          * we can try their selection but it may not be
 4405                          * bound.
 4406                          */
 4407                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
 4408                         lsa6_tmp.sin6_family = AF_INET6;
 4409                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 4410                         lsa6 = &lsa6_tmp;
 4411                         if (net && out_of_asoc_ok == 0) {
 4412                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4413                                         sctp_free_ifa(net->ro._s_addr);
 4414                                         net->ro._s_addr = NULL;
 4415                                         net->src_addr_selected = 0;
 4416                                         if (ro->ro_rt) {
 4417                                                 RTFREE(ro->ro_rt);
 4418                                                 ro->ro_rt = NULL;
 4419                                         }
 4420                                 }
 4421                                 if (net->src_addr_selected == 0) {
 4422                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4423                                         /* KAME hack: embed scopeid */
 4424                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4425                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4426                                                 return (EINVAL);
 4427                                         }
 4428                                         /* Cache the source address */
 4429                                         net->ro._s_addr = sctp_source_address_selection(inp,
 4430                                             stcb,
 4431                                             ro,
 4432                                             net,
 4433                                             0,
 4434                                             vrf_id);
 4435                                         (void)sa6_recoverscope(sin6);
 4436                                         net->src_addr_selected = 1;
 4437                                 }
 4438                                 if (net->ro._s_addr == NULL) {
 4439                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 4440                                         net->src_addr_selected = 0;
 4441                                         sctp_handle_no_route(stcb, net, so_locked);
 4442                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4443                                         sctp_m_freem(m);
 4444                                         return (EHOSTUNREACH);
 4445                                 }
 4446                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 4447                         } else {
 4448                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 4449                                 /* KAME hack: embed scopeid */
 4450                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4451                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4452                                         return (EINVAL);
 4453                                 }
 4454                                 if (over_addr == NULL) {
 4455                                         struct sctp_ifa *_lsrc;
 4456 
 4457                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4458                                             net,
 4459                                             out_of_asoc_ok,
 4460                                             vrf_id);
 4461                                         if (_lsrc == NULL) {
 4462                                                 sctp_handle_no_route(stcb, net, so_locked);
 4463                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4464                                                 sctp_m_freem(m);
 4465                                                 return (EHOSTUNREACH);
 4466                                         }
 4467                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 4468                                         sctp_free_ifa(_lsrc);
 4469                                 } else {
 4470                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
 4471                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4472                                 }
 4473                                 (void)sa6_recoverscope(sin6);
 4474                         }
 4475                         lsa6->sin6_port = inp->sctp_lport;
 4476 
 4477                         if (ro->ro_rt == NULL) {
 4478                                 /*
 4479                                  * src addr selection failed to find a route
 4480                                  * (or valid source addr), so we can't get
 4481                                  * there from here!
 4482                                  */
 4483                                 sctp_handle_no_route(stcb, net, so_locked);
 4484                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4485                                 sctp_m_freem(m);
 4486                                 return (EHOSTUNREACH);
 4487                         }
 4488                         /*
 4489                          * XXX: sa6 may not have a valid sin6_scope_id in
 4490                          * the non-SCOPEDROUTING case.
 4491                          */
 4492                         bzero(&lsa6_storage, sizeof(lsa6_storage));
 4493                         lsa6_storage.sin6_family = AF_INET6;
 4494                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
 4495                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4496                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 4497                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 4498                                 sctp_m_freem(m);
 4499                                 return (error);
 4500                         }
 4501                         /* XXX */
 4502                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4503                         lsa6_storage.sin6_port = inp->sctp_lport;
 4504                         lsa6 = &lsa6_storage;
 4505                         ip6h->ip6_src = lsa6->sin6_addr;
 4506 
 4507                         if (port) {
 4508                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4509                                         sctp_handle_no_route(stcb, net, so_locked);
 4510                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4511                                         sctp_m_freem(m);
 4512                                         return (EHOSTUNREACH);
 4513                                 }
 4514                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4515                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4516                                 udp->uh_dport = port;
 4517                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
 4518                                 udp->uh_sum = 0;
 4519                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4520                         } else {
 4521                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4522                         }
 4523 
 4524                         sctphdr->src_port = src_port;
 4525                         sctphdr->dest_port = dest_port;
 4526                         sctphdr->v_tag = v_tag;
 4527                         sctphdr->checksum = 0;
 4528 
 4529                         /*
 4530                          * We set the hop limit now since there is a good
 4531                          * chance that our ro pointer is now filled
 4532                          */
 4533                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 4534                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4535 
 4536 #ifdef SCTP_DEBUG
 4537                         /* Copy to be sure something bad is not happening */
 4538                         sin6->sin6_addr = ip6h->ip6_dst;
 4539                         lsa6->sin6_addr = ip6h->ip6_src;
 4540 #endif
 4541 
 4542                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 4543                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 4544                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 4545                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 4546                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 4547                         if (net) {
 4548                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4549                                 /*
 4550                                  * preserve the port and scope for link
 4551                                  * local send
 4552                                  */
 4553                                 prev_scope = sin6->sin6_scope_id;
 4554                                 prev_port = sin6->sin6_port;
 4555                         }
 4556                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4557                                 /* failed to prepend data, give up */
 4558                                 sctp_m_freem(m);
 4559                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4560                                 return (ENOMEM);
 4561                         }
 4562                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4563                         if (port) {
 4564 #if defined(SCTP_WITH_NO_CSUM)
 4565                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4566 #else
 4567                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
 4568                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4569 #endif
 4570                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 4571                                         udp->uh_sum = 0xffff;
 4572                                 }
 4573                         } else {
 4574 #if defined(SCTP_WITH_NO_CSUM)
 4575                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4576 #else
 4577                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
 4578                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4579                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4580 #endif
 4581                         }
 4582                         /* send it out. table id is taken from stcb */
 4583 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4584                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4585                                 so = SCTP_INP_SO(inp);
 4586                                 SCTP_SOCKET_UNLOCK(so, 0);
 4587                         }
 4588 #endif
 4589 #ifdef SCTP_PACKET_LOGGING
 4590                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4591                                 sctp_packet_log(o_pak);
 4592 #endif
 4593                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
 4594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4595                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4596                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4597                                 SCTP_TCB_UNLOCK(stcb);
 4598                                 SCTP_SOCKET_LOCK(so, 0);
 4599                                 SCTP_TCB_LOCK(stcb);
 4600                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4601                         }
 4602 #endif
 4603                         if (net) {
 4604                                 /* for link local this must be done */
 4605                                 sin6->sin6_scope_id = prev_scope;
 4606                                 sin6->sin6_port = prev_port;
 4607                         }
 4608                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 4609                         SCTP_STAT_INCR(sctps_sendpackets);
 4610                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4611                         if (ret) {
 4612                                 SCTP_STAT_INCR(sctps_senderrors);
 4613                         }
 4614                         if (net == NULL) {
 4615                                 /* Now if we had a temp route free it */
 4616                                 RO_RTFREE(ro);
 4617                         } else {
 4618                                 /*
 4619                                  * PMTU check versus smallest asoc MTU goes
 4620                                  * here
 4621                                  */
 4622                                 if (ro->ro_rt == NULL) {
 4623                                         /* Route was freed */
 4624                                         if (net->ro._s_addr &&
 4625                                             net->src_addr_selected) {
 4626                                                 sctp_free_ifa(net->ro._s_addr);
 4627                                                 net->ro._s_addr = NULL;
 4628                                         }
 4629                                         net->src_addr_selected = 0;
 4630                                 }
 4631                                 if ((ro->ro_rt != NULL) &&
 4632                                     (net->ro._s_addr)) {
 4633                                         uint32_t mtu;
 4634 
 4635                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4636                                         if (mtu &&
 4637                                             (stcb->asoc.smallest_mtu > mtu)) {
 4638                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4639                                                 net->mtu = mtu;
 4640                                                 if (net->port) {
 4641                                                         net->mtu -= sizeof(struct udphdr);
 4642                                                 }
 4643                                         }
 4644                                 } else if (ifp) {
 4645                                         if (ND_IFINFO(ifp)->linkmtu &&
 4646                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 4647                                                 sctp_mtu_size_reset(inp,
 4648                                                     &stcb->asoc,
 4649                                                     ND_IFINFO(ifp)->linkmtu);
 4650                                         }
 4651                                 }
 4652                         }
 4653                         return (ret);
 4654                 }
 4655 #endif
 4656         default:
 4657                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 4658                     ((struct sockaddr *)to)->sa_family);
 4659                 sctp_m_freem(m);
 4660                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4661                 return (EFAULT);
 4662         }
 4663 }
 4664 
 4665 
 4666 void
 4667 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
 4668 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 4669     SCTP_UNUSED
 4670 #endif
 4671 )
 4672 {
 4673         struct mbuf *m, *m_last;
 4674         struct sctp_nets *net;
 4675         struct sctp_init_chunk *init;
 4676         struct sctp_supported_addr_param *sup_addr;
 4677         struct sctp_adaptation_layer_indication *ali;
 4678         struct sctp_supported_chunk_types_param *pr_supported;
 4679         struct sctp_paramhdr *ph;
 4680         int cnt_inits_to = 0;
 4681         int error;
 4682         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 4683 
 4684         /* INIT's always go to the primary (and usually ONLY address) */
 4685         net = stcb->asoc.primary_destination;
 4686         if (net == NULL) {
 4687                 net = TAILQ_FIRST(&stcb->asoc.nets);
 4688                 if (net == NULL) {
 4689                         /* TSNH */
 4690                         return;
 4691                 }
 4692                 /* we confirm any address we send an INIT to */
 4693                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4694                 (void)sctp_set_primary_addr(stcb, NULL, net);
 4695         } else {
 4696                 /* we confirm any address we send an INIT to */
 4697                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4698         }
 4699         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 4700 #ifdef INET6
 4701         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 4702                 /*
 4703                  * special hook, if we are sending to link local it will not
 4704                  * show up in our private address count.
 4705                  */
 4706                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
 4707                         cnt_inits_to = 1;
 4708         }
 4709 #endif
 4710         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 4711                 /* This case should not happen */
 4712                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 4713                 return;
 4714         }
 4715         /* start the INIT timer */
 4716         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 4717 
 4718         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
 4719         if (m == NULL) {
 4720                 /* No memory, INIT timer will re-attempt. */
 4721                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 4722                 return;
 4723         }
 4724         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
 4725         padding_len = 0;
 4726         /* Now lets put the chunk header in place */
 4727         init = mtod(m, struct sctp_init_chunk *);
 4728         /* now the chunk header */
 4729         init->ch.chunk_type = SCTP_INITIATION;
 4730         init->ch.chunk_flags = 0;
 4731         /* fill in later from mbuf we build */
 4732         init->ch.chunk_length = 0;
 4733         /* place in my tag */
 4734         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
 4735         /* set up some of the credits. */
 4736         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
 4737             SCTP_MINIMAL_RWND));
 4738         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 4739         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 4740         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 4741 
 4742         /* Adaptation layer indication parameter */
 4743         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 4744                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 4745                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 4746                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 4747                 ali->ph.param_length = htons(parameter_len);
 4748                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 4749                 chunk_len += parameter_len;
 4750         }
 4751         /* ECN parameter */
 4752         if (stcb->asoc.ecn_supported == 1) {
 4753                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4754                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4755                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 4756                 ph->param_length = htons(parameter_len);
 4757                 chunk_len += parameter_len;
 4758         }
 4759         /* PR-SCTP supported parameter */
 4760         if (stcb->asoc.prsctp_supported == 1) {
 4761                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4762                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4763                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 4764                 ph->param_length = htons(parameter_len);
 4765                 chunk_len += parameter_len;
 4766         }
 4767         /* Add NAT friendly parameter. */
 4768         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
 4769                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4770                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4771                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 4772                 ph->param_length = htons(parameter_len);
 4773                 chunk_len += parameter_len;
 4774         }
 4775         /* And now tell the peer which extensions we support */
 4776         num_ext = 0;
 4777         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 4778         if (stcb->asoc.prsctp_supported == 1) {
 4779                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 4780                 if (stcb->asoc.idata_supported) {
 4781                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
 4782                 }
 4783         }
 4784         if (stcb->asoc.auth_supported == 1) {
 4785                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 4786         }
 4787         if (stcb->asoc.asconf_supported == 1) {
 4788                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 4789                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 4790         }
 4791         if (stcb->asoc.reconfig_supported == 1) {
 4792                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 4793         }
 4794         if (stcb->asoc.idata_supported) {
 4795                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
 4796         }
 4797         if (stcb->asoc.nrsack_supported == 1) {
 4798                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 4799         }
 4800         if (stcb->asoc.pktdrop_supported == 1) {
 4801                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 4802         }
 4803         if (num_ext > 0) {
 4804                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 4805                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 4806                 pr_supported->ph.param_length = htons(parameter_len);
 4807                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4808                 chunk_len += parameter_len;
 4809         }
 4810         /* add authentication parameters */
 4811         if (stcb->asoc.auth_supported) {
 4812                 /* attach RANDOM parameter, if available */
 4813                 if (stcb->asoc.authinfo.random != NULL) {
 4814                         struct sctp_auth_random *randp;
 4815 
 4816                         if (padding_len > 0) {
 4817                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4818                                 chunk_len += padding_len;
 4819                                 padding_len = 0;
 4820                         }
 4821                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 4822                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
 4823                         /* random key already contains the header */
 4824                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
 4825                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4826                         chunk_len += parameter_len;
 4827                 }
 4828                 /* add HMAC_ALGO parameter */
 4829                 if (stcb->asoc.local_hmacs != NULL) {
 4830                         struct sctp_auth_hmac_algo *hmacs;
 4831 
 4832                         if (padding_len > 0) {
 4833                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4834                                 chunk_len += padding_len;
 4835                                 padding_len = 0;
 4836                         }
 4837                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 4838                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
 4839                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
 4840                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 4841                         hmacs->ph.param_length = htons(parameter_len);
 4842                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
 4843                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4844                         chunk_len += parameter_len;
 4845                 }
 4846                 /* add CHUNKS parameter */
 4847                 if (stcb->asoc.local_auth_chunks != NULL) {
 4848                         struct sctp_auth_chunk_list *chunks;
 4849 
 4850                         if (padding_len > 0) {
 4851                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4852                                 chunk_len += padding_len;
 4853                                 padding_len = 0;
 4854                         }
 4855                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 4856                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
 4857                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
 4858                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 4859                         chunks->ph.param_length = htons(parameter_len);
 4860                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
 4861                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4862                         chunk_len += parameter_len;
 4863                 }
 4864         }
 4865         /* now any cookie time extensions */
 4866         if (stcb->asoc.cookie_preserve_req) {
 4867                 struct sctp_cookie_perserve_param *cookie_preserve;
 4868 
 4869                 if (padding_len > 0) {
 4870                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4871                         chunk_len += padding_len;
 4872                         padding_len = 0;
 4873                 }
 4874                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
 4875                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
 4876                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 4877                 cookie_preserve->ph.param_length = htons(parameter_len);
 4878                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 4879                 stcb->asoc.cookie_preserve_req = 0;
 4880                 chunk_len += parameter_len;
 4881         }
 4882         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
 4883                 uint8_t i;
 4884 
 4885                 if (padding_len > 0) {
 4886                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4887                         chunk_len += padding_len;
 4888                         padding_len = 0;
 4889                 }
 4890                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4891                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4892                         parameter_len += (uint16_t)sizeof(uint16_t);
 4893                 }
 4894                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4895                         parameter_len += (uint16_t)sizeof(uint16_t);
 4896                 }
 4897                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
 4898                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 4899                 sup_addr->ph.param_length = htons(parameter_len);
 4900                 i = 0;
 4901                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4902                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
 4903                 }
 4904                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4905                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
 4906                 }
 4907                 padding_len = 4 - 2 * i;
 4908                 chunk_len += parameter_len;
 4909         }
 4910         SCTP_BUF_LEN(m) = chunk_len;
 4911         /* now the addresses */
 4912         /*
 4913          * To optimize this we could put the scoping stuff into a structure
 4914          * and remove the individual uint8's from the assoc structure. Then
 4915          * we could just sifa in the address within the stcb. But for now
 4916          * this is a quick hack to get the address stuff teased apart.
 4917          */
 4918         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
 4919             m, cnt_inits_to,
 4920             &padding_len, &chunk_len);
 4921 
 4922         init->ch.chunk_length = htons(chunk_len);
 4923         if (padding_len > 0) {
 4924                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 4925                         sctp_m_freem(m);
 4926                         return;
 4927                 }
 4928         }
 4929         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 4930         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 4931             (struct sockaddr *)&net->ro._l_addr,
 4932             m, 0, NULL, 0, 0, 0, 0,
 4933             inp->sctp_lport, stcb->rport, htonl(0),
 4934             net->port, NULL,
 4935             0, 0,
 4936             so_locked))) {
 4937                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 4938                 if (error == ENOBUFS) {
 4939                         stcb->asoc.ifp_had_enobuf = 1;
 4940                         SCTP_STAT_INCR(sctps_lowlevelerr);
 4941                 }
 4942         } else {
 4943                 stcb->asoc.ifp_had_enobuf = 0;
 4944         }
 4945         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 4946         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 4947 }
 4948 
 4949 struct mbuf *
 4950 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 4951     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
 4952 {
 4953         /*
 4954          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 4955          * being equal to the beginning of the params i.e. (iphlen +
 4956          * sizeof(struct sctp_init_msg) parse through the parameters to the
 4957          * end of the mbuf verifying that all parameters are known.
 4958          *
 4959          * For unknown parameters build and return a mbuf with
 4960          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 4961          * processing this chunk stop, and set *abort_processing to 1.
 4962          *
 4963          * By having param_offset be pre-set to where parameters begin it is
 4964          * hoped that this routine may be reused in the future by new
 4965          * features.
 4966          */
 4967         struct sctp_paramhdr *phdr, params;
 4968 
 4969         struct mbuf *mat, *op_err;
 4970         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
 4971         int at, limit, pad_needed;
 4972         uint16_t ptype, plen, padded_size;
 4973         int err_at;
 4974 
 4975         *abort_processing = 0;
 4976         mat = in_initpkt;
 4977         err_at = 0;
 4978         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 4979         at = param_offset;
 4980         op_err = NULL;
 4981         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 4982         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4983         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 4984                 ptype = ntohs(phdr->param_type);
 4985                 plen = ntohs(phdr->param_length);
 4986                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 4987                         /* wacked parameter */
 4988                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 4989                         goto invalid_size;
 4990                 }
 4991                 limit -= SCTP_SIZE32(plen);
 4992                 /*-
 4993                  * All parameters for all chunks that we know/understand are
 4994                  * listed here. We process them other places and make
 4995                  * appropriate stop actions per the upper bits. However this
 4996                  * is the generic routine processor's can call to get back
 4997                  * an operr.. to either incorporate (init-ack) or send.
 4998                  */
 4999                 padded_size = SCTP_SIZE32(plen);
 5000                 switch (ptype) {
 5001                         /* Param's with variable size */
 5002                 case SCTP_HEARTBEAT_INFO:
 5003                 case SCTP_STATE_COOKIE:
 5004                 case SCTP_UNRECOG_PARAM:
 5005                 case SCTP_ERROR_CAUSE_IND:
 5006                         /* ok skip fwd */
 5007                         at += padded_size;
 5008                         break;
 5009                         /* Param's with variable size within a range */
 5010                 case SCTP_CHUNK_LIST:
 5011                 case SCTP_SUPPORTED_CHUNK_EXT:
 5012                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 5013                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 5014                                 goto invalid_size;
 5015                         }
 5016                         at += padded_size;
 5017                         break;
 5018                 case SCTP_SUPPORTED_ADDRTYPE:
 5019                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 5020                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 5021                                 goto invalid_size;
 5022                         }
 5023                         at += padded_size;
 5024                         break;
 5025                 case SCTP_RANDOM:
 5026                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 5027                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 5028                                 goto invalid_size;
 5029                         }
 5030                         at += padded_size;
 5031                         break;
 5032                 case SCTP_SET_PRIM_ADDR:
 5033                 case SCTP_DEL_IP_ADDRESS:
 5034                 case SCTP_ADD_IP_ADDRESS:
 5035                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 5036                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 5037                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 5038                                 goto invalid_size;
 5039                         }
 5040                         at += padded_size;
 5041                         break;
 5042                         /* Param's with a fixed size */
 5043                 case SCTP_IPV4_ADDRESS:
 5044                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 5045                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 5046                                 goto invalid_size;
 5047                         }
 5048                         at += padded_size;
 5049                         break;
 5050                 case SCTP_IPV6_ADDRESS:
 5051                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 5052                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 5053                                 goto invalid_size;
 5054                         }
 5055                         at += padded_size;
 5056                         break;
 5057                 case SCTP_COOKIE_PRESERVE:
 5058                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 5059                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 5060                                 goto invalid_size;
 5061                         }
 5062                         at += padded_size;
 5063                         break;
 5064                 case SCTP_HAS_NAT_SUPPORT:
 5065                         *nat_friendly = 1;
 5066                         /* fall through */
 5067                 case SCTP_PRSCTP_SUPPORTED:
 5068                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5069                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
 5070                                 goto invalid_size;
 5071                         }
 5072                         at += padded_size;
 5073                         break;
 5074                 case SCTP_ECN_CAPABLE:
 5075                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5076                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 5077                                 goto invalid_size;
 5078                         }
 5079                         at += padded_size;
 5080                         break;
 5081                 case SCTP_ULP_ADAPTATION:
 5082                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 5083                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 5084                                 goto invalid_size;
 5085                         }
 5086                         at += padded_size;
 5087                         break;
 5088                 case SCTP_SUCCESS_REPORT:
 5089                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 5090                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 5091                                 goto invalid_size;
 5092                         }
 5093                         at += padded_size;
 5094                         break;
 5095                 case SCTP_HOSTNAME_ADDRESS:
 5096                         {
 5097                                 /* We can NOT handle HOST NAME addresses!! */
 5098                                 int l_len;
 5099 
 5100                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 5101                                 *abort_processing = 1;
 5102                                 if (op_err == NULL) {
 5103                                         /* Ok need to try to get a mbuf */
 5104 #ifdef INET6
 5105                                         l_len = SCTP_MIN_OVERHEAD;
 5106 #else
 5107                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5108 #endif
 5109                                         l_len += sizeof(struct sctp_chunkhdr);
 5110                                         l_len += plen;
 5111                                         l_len += sizeof(struct sctp_paramhdr);
 5112                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5113                                         if (op_err) {
 5114                                                 SCTP_BUF_LEN(op_err) = 0;
 5115                                                 /*
 5116                                                  * pre-reserve space for ip
 5117                                                  * and sctp header  and
 5118                                                  * chunk hdr
 5119                                                  */
 5120 #ifdef INET6
 5121                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5122 #else
 5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5124 #endif
 5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5126                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5127                                         }
 5128                                 }
 5129                                 if (op_err) {
 5130                                         /* If we have space */
 5131                                         struct sctp_paramhdr s;
 5132 
 5133                                         if (err_at % 4) {
 5134                                                 uint32_t cpthis = 0;
 5135 
 5136                                                 pad_needed = 4 - (err_at % 4);
 5137                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5138                                                 err_at += pad_needed;
 5139                                         }
 5140                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 5141                                         s.param_length = htons(sizeof(s) + plen);
 5142                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5143                                         err_at += sizeof(s);
 5144                                         if (plen > sizeof(tempbuf)) {
 5145                                                 plen = sizeof(tempbuf);
 5146                                         }
 5147                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
 5148                                         if (phdr == NULL) {
 5149                                                 sctp_m_freem(op_err);
 5150                                                 /*
 5151                                                  * we are out of memory but
 5152                                                  * we still need to have a
 5153                                                  * look at what to do (the
 5154                                                  * system is in trouble
 5155                                                  * though).
 5156                                                  */
 5157                                                 return (NULL);
 5158                                         }
 5159                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 5160                                 }
 5161                                 return (op_err);
 5162                                 break;
 5163                         }
 5164                 default:
 5165                         /*
 5166                          * we do not recognize the parameter figure out what
 5167                          * we do.
 5168                          */
 5169                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 5170                         if ((ptype & 0x4000) == 0x4000) {
 5171                                 /* Report bit is set?? */
 5172                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 5173                                 if (op_err == NULL) {
 5174                                         int l_len;
 5175 
 5176                                         /* Ok need to try to get an mbuf */
 5177 #ifdef INET6
 5178                                         l_len = SCTP_MIN_OVERHEAD;
 5179 #else
 5180                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5181 #endif
 5182                                         l_len += sizeof(struct sctp_chunkhdr);
 5183                                         l_len += plen;
 5184                                         l_len += sizeof(struct sctp_paramhdr);
 5185                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5186                                         if (op_err) {
 5187                                                 SCTP_BUF_LEN(op_err) = 0;
 5188 #ifdef INET6
 5189                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5190 #else
 5191                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5192 #endif
 5193                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5195                                         }
 5196                                 }
 5197                                 if (op_err) {
 5198                                         /* If we have space */
 5199                                         struct sctp_paramhdr s;
 5200 
 5201                                         if (err_at % 4) {
 5202                                                 uint32_t cpthis = 0;
 5203 
 5204                                                 pad_needed = 4 - (err_at % 4);
 5205                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5206                                                 err_at += pad_needed;
 5207                                         }
 5208                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
 5209                                         s.param_length = htons(sizeof(s) + plen);
 5210                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5211                                         err_at += sizeof(s);
 5212                                         if (plen > sizeof(tempbuf)) {
 5213                                                 plen = sizeof(tempbuf);
 5214                                         }
 5215                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, plen);
 5216                                         if (phdr == NULL) {
 5217                                                 sctp_m_freem(op_err);
 5218                                                 /*
 5219                                                  * we are out of memory but
 5220                                                  * we still need to have a
 5221                                                  * look at what to do (the
 5222                                                  * system is in trouble
 5223                                                  * though).
 5224                                                  */
 5225                                                 op_err = NULL;
 5226                                                 goto more_processing;
 5227                                         }
 5228                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 5229                                         err_at += plen;
 5230                                 }
 5231                         }
 5232         more_processing:
 5233                         if ((ptype & 0x8000) == 0x0000) {
 5234                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 5235                                 return (op_err);
 5236                         } else {
 5237                                 /* skip this chunk and continue processing */
 5238                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 5239                                 at += SCTP_SIZE32(plen);
 5240                         }
 5241                         break;
 5242 
 5243                 }
 5244                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 5245         }
 5246         return (op_err);
 5247 invalid_size:
 5248         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 5249         *abort_processing = 1;
 5250         if ((op_err == NULL) && phdr) {
 5251                 int l_len;
 5252 #ifdef INET6
 5253                 l_len = SCTP_MIN_OVERHEAD;
 5254 #else
 5255                 l_len = SCTP_MIN_V4_OVERHEAD;
 5256 #endif
 5257                 l_len += sizeof(struct sctp_chunkhdr);
 5258                 l_len += (2 * sizeof(struct sctp_paramhdr));
 5259                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5260                 if (op_err) {
 5261                         SCTP_BUF_LEN(op_err) = 0;
 5262 #ifdef INET6
 5263                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5264 #else
 5265                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5266 #endif
 5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5268                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5269                 }
 5270         }
 5271         if ((op_err) && phdr) {
 5272                 struct sctp_paramhdr s;
 5273 
 5274                 if (err_at % 4) {
 5275                         uint32_t cpthis = 0;
 5276 
 5277                         pad_needed = 4 - (err_at % 4);
 5278                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5279                         err_at += pad_needed;
 5280                 }
 5281                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 5282                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
 5283                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5284                 err_at += sizeof(s);
 5285                 /* Only copy back the p-hdr that caused the issue */
 5286                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
 5287         }
 5288         return (op_err);
 5289 }
 5290 
 5291 static int
 5292 sctp_are_there_new_addresses(struct sctp_association *asoc,
 5293     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
 5294 {
 5295         /*
 5296          * Given a INIT packet, look through the packet to verify that there
 5297          * are NO new addresses. As we go through the parameters add reports
 5298          * of any un-understood parameters that require an error.  Also we
 5299          * must return (1) to drop the packet if we see a un-understood
 5300          * parameter that tells us to drop the chunk.
 5301          */
 5302         struct sockaddr *sa_touse;
 5303         struct sockaddr *sa;
 5304         struct sctp_paramhdr *phdr, params;
 5305         uint16_t ptype, plen;
 5306         uint8_t fnd;
 5307         struct sctp_nets *net;
 5308         int check_src;
 5309 #ifdef INET
 5310         struct sockaddr_in sin4, *sa4;
 5311 #endif
 5312 #ifdef INET6
 5313         struct sockaddr_in6 sin6, *sa6;
 5314 #endif
 5315 
 5316 #ifdef INET
 5317         memset(&sin4, 0, sizeof(sin4));
 5318         sin4.sin_family = AF_INET;
 5319         sin4.sin_len = sizeof(sin4);
 5320 #endif
 5321 #ifdef INET6
 5322         memset(&sin6, 0, sizeof(sin6));
 5323         sin6.sin6_family = AF_INET6;
 5324         sin6.sin6_len = sizeof(sin6);
 5325 #endif
 5326         /* First what about the src address of the pkt ? */
 5327         check_src = 0;
 5328         switch (src->sa_family) {
 5329 #ifdef INET
 5330         case AF_INET:
 5331                 if (asoc->scope.ipv4_addr_legal) {
 5332                         check_src = 1;
 5333                 }
 5334                 break;
 5335 #endif
 5336 #ifdef INET6
 5337         case AF_INET6:
 5338                 if (asoc->scope.ipv6_addr_legal) {
 5339                         check_src = 1;
 5340                 }
 5341                 break;
 5342 #endif
 5343         default:
 5344                 /* TSNH */
 5345                 break;
 5346         }
 5347         if (check_src) {
 5348                 fnd = 0;
 5349                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5350                         sa = (struct sockaddr *)&net->ro._l_addr;
 5351                         if (sa->sa_family == src->sa_family) {
 5352 #ifdef INET
 5353                                 if (sa->sa_family == AF_INET) {
 5354                                         struct sockaddr_in *src4;
 5355 
 5356                                         sa4 = (struct sockaddr_in *)sa;
 5357                                         src4 = (struct sockaddr_in *)src;
 5358                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
 5359                                                 fnd = 1;
 5360                                                 break;
 5361                                         }
 5362                                 }
 5363 #endif
 5364 #ifdef INET6
 5365                                 if (sa->sa_family == AF_INET6) {
 5366                                         struct sockaddr_in6 *src6;
 5367 
 5368                                         sa6 = (struct sockaddr_in6 *)sa;
 5369                                         src6 = (struct sockaddr_in6 *)src;
 5370                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
 5371                                                 fnd = 1;
 5372                                                 break;
 5373                                         }
 5374                                 }
 5375 #endif
 5376                         }
 5377                 }
 5378                 if (fnd == 0) {
 5379                         /* New address added! no need to look further. */
 5380                         return (1);
 5381                 }
 5382         }
 5383         /* Ok so far lets munge through the rest of the packet */
 5384         offset += sizeof(struct sctp_init_chunk);
 5385         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5386         while (phdr) {
 5387                 sa_touse = NULL;
 5388                 ptype = ntohs(phdr->param_type);
 5389                 plen = ntohs(phdr->param_length);
 5390                 switch (ptype) {
 5391 #ifdef INET
 5392                 case SCTP_IPV4_ADDRESS:
 5393                         {
 5394                                 struct sctp_ipv4addr_param *p4, p4_buf;
 5395 
 5396                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
 5397                                         return (1);
 5398                                 }
 5399                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5400                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 5401                                 if (phdr == NULL) {
 5402                                         return (1);
 5403                                 }
 5404                                 if (asoc->scope.ipv4_addr_legal) {
 5405                                         p4 = (struct sctp_ipv4addr_param *)phdr;
 5406                                         sin4.sin_addr.s_addr = p4->addr;
 5407                                         sa_touse = (struct sockaddr *)&sin4;
 5408                                 }
 5409                                 break;
 5410                         }
 5411 #endif
 5412 #ifdef INET6
 5413                 case SCTP_IPV6_ADDRESS:
 5414                         {
 5415                                 struct sctp_ipv6addr_param *p6, p6_buf;
 5416 
 5417                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
 5418                                         return (1);
 5419                                 }
 5420                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5421                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 5422                                 if (phdr == NULL) {
 5423                                         return (1);
 5424                                 }
 5425                                 if (asoc->scope.ipv6_addr_legal) {
 5426                                         p6 = (struct sctp_ipv6addr_param *)phdr;
 5427                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 5428                                             sizeof(p6->addr));
 5429                                         sa_touse = (struct sockaddr *)&sin6;
 5430                                 }
 5431                                 break;
 5432                         }
 5433 #endif
 5434                 default:
 5435                         sa_touse = NULL;
 5436                         break;
 5437                 }
 5438                 if (sa_touse) {
 5439                         /* ok, sa_touse points to one to check */
 5440                         fnd = 0;
 5441                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5442                                 sa = (struct sockaddr *)&net->ro._l_addr;
 5443                                 if (sa->sa_family != sa_touse->sa_family) {
 5444                                         continue;
 5445                                 }
 5446 #ifdef INET
 5447                                 if (sa->sa_family == AF_INET) {
 5448                                         sa4 = (struct sockaddr_in *)sa;
 5449                                         if (sa4->sin_addr.s_addr ==
 5450                                             sin4.sin_addr.s_addr) {
 5451                                                 fnd = 1;
 5452                                                 break;
 5453                                         }
 5454                                 }
 5455 #endif
 5456 #ifdef INET6
 5457                                 if (sa->sa_family == AF_INET6) {
 5458                                         sa6 = (struct sockaddr_in6 *)sa;
 5459                                         if (SCTP6_ARE_ADDR_EQUAL(
 5460                                             sa6, &sin6)) {
 5461                                                 fnd = 1;
 5462                                                 break;
 5463                                         }
 5464                                 }
 5465 #endif
 5466                         }
 5467                         if (!fnd) {
 5468                                 /* New addr added! no need to look further */
 5469                                 return (1);
 5470                         }
 5471                 }
 5472                 offset += SCTP_SIZE32(plen);
 5473                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5474         }
 5475         return (0);
 5476 }
 5477 
 5478 /*
 5479  * Given a MBUF chain that was sent into us containing an INIT. Build a
 5480  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 5481  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 5482  * message (i.e. the struct sctp_init_msg).
 5483  */
 5484 void
 5485 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 5486     struct sctp_nets *src_net, struct mbuf *init_pkt,
 5487     int iphlen, int offset,
 5488     struct sockaddr *src, struct sockaddr *dst,
 5489     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
 5490     uint8_t mflowtype, uint32_t mflowid,
 5491     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
 5492 {
 5493         struct sctp_association *asoc;
 5494         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
 5495         struct sctp_init_ack_chunk *initack;
 5496         struct sctp_adaptation_layer_indication *ali;
 5497         struct sctp_supported_chunk_types_param *pr_supported;
 5498         struct sctp_paramhdr *ph;
 5499         union sctp_sockstore *over_addr;
 5500         struct sctp_scoping scp;
 5501 #ifdef INET
 5502         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
 5503         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
 5504         struct sockaddr_in *sin;
 5505 #endif
 5506 #ifdef INET6
 5507         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
 5508         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
 5509         struct sockaddr_in6 *sin6;
 5510 #endif
 5511         struct sockaddr *to;
 5512         struct sctp_state_cookie stc;
 5513         struct sctp_nets *net = NULL;
 5514         uint8_t *signature = NULL;
 5515         int cnt_inits_to = 0;
 5516         uint16_t his_limit, i_want;
 5517         int abort_flag;
 5518         int nat_friendly = 0;
 5519         int error;
 5520         struct socket *so;
 5521         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 5522 
 5523         if (stcb) {
 5524                 asoc = &stcb->asoc;
 5525         } else {
 5526                 asoc = NULL;
 5527         }
 5528         if ((asoc != NULL) &&
 5529             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
 5530                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
 5531                         /*
 5532                          * new addresses, out of here in non-cookie-wait
 5533                          * states
 5534                          *
 5535                          * Send an ABORT, without the new address error
 5536                          * cause. This looks no different than if no
 5537                          * listener was present.
 5538                          */
 5539                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5540                             "Address added");
 5541                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5542                             mflowtype, mflowid, inp->fibnum,
 5543                             vrf_id, port);
 5544                         return;
 5545                 }
 5546                 if (src_net != NULL && (src_net->port != port)) {
 5547                         /*
 5548                          * change of remote encapsulation port, out of here
 5549                          * in non-cookie-wait states
 5550                          *
 5551                          * Send an ABORT, without an specific error cause.
 5552                          * This looks no different than if no listener was
 5553                          * present.
 5554                          */
 5555                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5556                             "Remote encapsulation port changed");
 5557                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5558                             mflowtype, mflowid, inp->fibnum,
 5559                             vrf_id, port);
 5560                         return;
 5561                 }
 5562         }
 5563         abort_flag = 0;
 5564         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 5565             (offset + sizeof(struct sctp_init_chunk)),
 5566             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
 5567         if (abort_flag) {
 5568 do_a_abort:
 5569                 if (op_err == NULL) {
 5570                         char msg[SCTP_DIAG_INFO_LEN];
 5571 
 5572                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
 5573                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5574                             msg);
 5575                 }
 5576                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
 5577                     init_chk->init.initiate_tag, op_err,
 5578                     mflowtype, mflowid, inp->fibnum,
 5579                     vrf_id, port);
 5580                 return;
 5581         }
 5582         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 5583         if (m == NULL) {
 5584                 /* No memory, INIT timer will re-attempt. */
 5585                 if (op_err)
 5586                         sctp_m_freem(op_err);
 5587                 return;
 5588         }
 5589         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
 5590         padding_len = 0;
 5591 
 5592         /*
 5593          * We might not overwrite the identification[] completely and on
 5594          * some platforms time_entered will contain some padding. Therefore
 5595          * zero out the cookie to avoid putting uninitialized memory on the
 5596          * wire.
 5597          */
 5598         memset(&stc, 0, sizeof(struct sctp_state_cookie));
 5599 
 5600         /* the time I built cookie */
 5601         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
 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(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 5831             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
 5832             (SCTP_GET_STATE(asoc) == 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 (hold_inp_lock) {
 5840                         SCTP_INP_INCR_REF(inp);
 5841                         SCTP_INP_RUNLOCK(inp);
 5842                 }
 5843                 if (asoc) {
 5844                         atomic_add_int(&asoc->refcnt, 1);
 5845                         SCTP_TCB_UNLOCK(stcb);
 5846         new_tag:
 5847                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5848                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
 5849                                 /*
 5850                                  * Got a duplicate vtag on some guy behind a
 5851                                  * nat make sure we don't use it.
 5852                                  */
 5853                                 goto new_tag;
 5854                         }
 5855                         initack->init.initiate_tag = htonl(vtag);
 5856                         /* get a TSN to use too */
 5857                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 5858                         initack->init.initial_tsn = htonl(itsn);
 5859                         SCTP_TCB_LOCK(stcb);
 5860                         atomic_add_int(&asoc->refcnt, -1);
 5861                 } else {
 5862                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5863                         initack->init.initiate_tag = htonl(vtag);
 5864                         /* get a TSN to use too */
 5865                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 5866                 }
 5867                 if (hold_inp_lock) {
 5868                         SCTP_INP_RLOCK(inp);
 5869                         SCTP_INP_DECR_REF(inp);
 5870                 }
 5871         }
 5872         /* save away my tag to */
 5873         stc.my_vtag = initack->init.initiate_tag;
 5874 
 5875         /* set up some of the credits. */
 5876         so = inp->sctp_socket;
 5877         if (so == NULL) {
 5878                 /* memory problem */
 5879                 sctp_m_freem(m);
 5880                 return;
 5881         } else {
 5882                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 5883         }
 5884         /* set what I want */
 5885         his_limit = ntohs(init_chk->init.num_inbound_streams);
 5886         /* choose what I want */
 5887         if (asoc != NULL) {
 5888                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
 5889                         i_want = asoc->streamoutcnt;
 5890                 } else {
 5891                         i_want = asoc->pre_open_streams;
 5892                 }
 5893         } else {
 5894                 i_want = inp->sctp_ep.pre_open_stream_count;
 5895         }
 5896         if (his_limit < i_want) {
 5897                 /* I Want more :< */
 5898                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
 5899         } else {
 5900                 /* I can have what I want :> */
 5901                 initack->init.num_outbound_streams = htons(i_want);
 5902         }
 5903         /* tell him his limit. */
 5904         initack->init.num_inbound_streams =
 5905             htons(inp->sctp_ep.max_open_streams_intome);
 5906 
 5907         /* adaptation layer indication parameter */
 5908         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 5909                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 5910                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 5911                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 5912                 ali->ph.param_length = htons(parameter_len);
 5913                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 5914                 chunk_len += parameter_len;
 5915         }
 5916         /* ECN parameter */
 5917         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
 5918             ((asoc == NULL) && (inp->ecn_supported == 1))) {
 5919                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5920                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5921                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 5922                 ph->param_length = htons(parameter_len);
 5923                 chunk_len += parameter_len;
 5924         }
 5925         /* PR-SCTP supported parameter */
 5926         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5927             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5928                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5929                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5930                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 5931                 ph->param_length = htons(parameter_len);
 5932                 chunk_len += parameter_len;
 5933         }
 5934         /* Add NAT friendly parameter */
 5935         if (nat_friendly) {
 5936                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5937                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5938                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 5939                 ph->param_length = htons(parameter_len);
 5940                 chunk_len += parameter_len;
 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         /* add authentication parameters */
 5986         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5987             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5988                 struct sctp_auth_random *randp;
 5989                 struct sctp_auth_hmac_algo *hmacs;
 5990                 struct sctp_auth_chunk_list *chunks;
 5991 
 5992                 if (padding_len > 0) {
 5993                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 5994                         chunk_len += padding_len;
 5995                         padding_len = 0;
 5996                 }
 5997                 /* generate and add RANDOM parameter */
 5998                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 5999                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
 6000                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 6001                 randp->ph.param_type = htons(SCTP_RANDOM);
 6002                 randp->ph.param_length = htons(parameter_len);
 6003                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
 6004                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6005                 chunk_len += parameter_len;
 6006 
 6007                 if (padding_len > 0) {
 6008                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6009                         chunk_len += padding_len;
 6010                         padding_len = 0;
 6011                 }
 6012                 /* add HMAC_ALGO parameter */
 6013                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 6014                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
 6015                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 6016                     (uint8_t *)hmacs->hmac_ids);
 6017                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 6018                 hmacs->ph.param_length = htons(parameter_len);
 6019                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6020                 chunk_len += parameter_len;
 6021 
 6022                 if (padding_len > 0) {
 6023                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6024                         chunk_len += padding_len;
 6025                         padding_len = 0;
 6026                 }
 6027                 /* add CHUNKS parameter */
 6028                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 6029                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
 6030                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 6031                     chunks->chunk_types);
 6032                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 6033                 chunks->ph.param_length = htons(parameter_len);
 6034                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6035                 chunk_len += parameter_len;
 6036         }
 6037         SCTP_BUF_LEN(m) = chunk_len;
 6038         m_last = m;
 6039         /* now the addresses */
 6040         /*
 6041          * To optimize this we could put the scoping stuff into a structure
 6042          * and remove the individual uint8's from the stc structure. Then we
 6043          * could just sifa in the address within the stc.. but for now this
 6044          * is a quick hack to get the address stuff teased apart.
 6045          */
 6046         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 6047         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 6048         scp.loopback_scope = stc.loopback_scope;
 6049         scp.ipv4_local_scope = stc.ipv4_scope;
 6050         scp.local_scope = stc.local_scope;
 6051         scp.site_scope = stc.site_scope;
 6052         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
 6053             cnt_inits_to,
 6054             &padding_len, &chunk_len);
 6055         /* padding_len can only be positive, if no addresses have been added */
 6056         if (padding_len > 0) {
 6057                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6058                 chunk_len += padding_len;
 6059                 SCTP_BUF_LEN(m) += padding_len;
 6060                 padding_len = 0;
 6061         }
 6062         /* tack on the operational error if present */
 6063         if (op_err) {
 6064                 parameter_len = 0;
 6065                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6066                         parameter_len += SCTP_BUF_LEN(m_tmp);
 6067                 }
 6068                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6069                 SCTP_BUF_NEXT(m_last) = op_err;
 6070                 while (SCTP_BUF_NEXT(m_last) != NULL) {
 6071                         m_last = SCTP_BUF_NEXT(m_last);
 6072                 }
 6073                 chunk_len += parameter_len;
 6074         }
 6075         if (padding_len > 0) {
 6076                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
 6077                 if (m_last == NULL) {
 6078                         /* Houston we have a problem, no space */
 6079                         sctp_m_freem(m);
 6080                         return;
 6081                 }
 6082                 chunk_len += padding_len;
 6083                 padding_len = 0;
 6084         }
 6085         /* Now we must build a cookie */
 6086         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
 6087         if (m_cookie == NULL) {
 6088                 /* memory problem */
 6089                 sctp_m_freem(m);
 6090                 return;
 6091         }
 6092         /* Now append the cookie to the end and update the space/size */
 6093         SCTP_BUF_NEXT(m_last) = m_cookie;
 6094         parameter_len = 0;
 6095         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6096                 parameter_len += SCTP_BUF_LEN(m_tmp);
 6097                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 6098                         m_last = m_tmp;
 6099                 }
 6100         }
 6101         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6102         chunk_len += parameter_len;
 6103 
 6104         /*
 6105          * Place in the size, but we don't include the last pad (if any) in
 6106          * the INIT-ACK.
 6107          */
 6108         initack->ch.chunk_length = htons(chunk_len);
 6109 
 6110         /*
 6111          * Time to sign the cookie, we don't sign over the cookie signature
 6112          * though thus we set trailer.
 6113          */
 6114         (void)sctp_hmac_m(SCTP_HMAC,
 6115             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 6116             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 6117             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
 6118         /*
 6119          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 6120          * here since the timer will drive a retranmission.
 6121          */
 6122         if (padding_len > 0) {
 6123                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 6124                         sctp_m_freem(m);
 6125                         return;
 6126                 }
 6127         }
 6128         if (stc.loopback_scope) {
 6129                 over_addr = (union sctp_sockstore *)dst;
 6130         } else {
 6131                 over_addr = NULL;
 6132         }
 6133 
 6134         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 6135             0, 0,
 6136             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
 6137             port, over_addr,
 6138             mflowtype, mflowid,
 6139             SCTP_SO_NOT_LOCKED))) {
 6140                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 6141                 if (error == ENOBUFS) {
 6142                         if (asoc != NULL) {
 6143                                 asoc->ifp_had_enobuf = 1;
 6144                         }
 6145                         SCTP_STAT_INCR(sctps_lowlevelerr);
 6146                 }
 6147         } else {
 6148                 if (asoc != NULL) {
 6149                         asoc->ifp_had_enobuf = 0;
 6150                 }
 6151         }
 6152         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 6153 }
 6154 
 6155 
 6156 static void
 6157 sctp_prune_prsctp(struct sctp_tcb *stcb,
 6158     struct sctp_association *asoc,
 6159     struct sctp_sndrcvinfo *srcv,
 6160     int dataout)
 6161 {
 6162         int freed_spc = 0;
 6163         struct sctp_tmit_chunk *chk, *nchk;
 6164 
 6165         SCTP_TCB_LOCK_ASSERT(stcb);
 6166         if ((asoc->prsctp_supported) &&
 6167             (asoc->sent_queue_cnt_removeable > 0)) {
 6168                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 6169                         /*
 6170                          * Look for chunks marked with the PR_SCTP flag AND
 6171                          * the buffer space flag. If the one being sent is
 6172                          * equal or greater priority then purge the old one
 6173                          * and free some space.
 6174                          */
 6175                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6176                                 /*
 6177                                  * This one is PR-SCTP AND buffer space
 6178                                  * limited type
 6179                                  */
 6180                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6181                                         /*
 6182                                          * Lower numbers equates to higher
 6183                                          * priority so if the one we are
 6184                                          * looking at has a larger or equal
 6185                                          * priority we want to drop the data
 6186                                          * and NOT retransmit it.
 6187                                          */
 6188                                         if (chk->data) {
 6189                                                 /*
 6190                                                  * We release the book_size
 6191                                                  * if the mbuf is here
 6192                                                  */
 6193                                                 int ret_spc;
 6194                                                 uint8_t sent;
 6195 
 6196                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 6197                                                         sent = 1;
 6198                                                 else
 6199                                                         sent = 0;
 6200                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6201                                                     sent,
 6202                                                     SCTP_SO_LOCKED);
 6203                                                 freed_spc += ret_spc;
 6204                                                 if (freed_spc >= dataout) {
 6205                                                         return;
 6206                                                 }
 6207                                         }       /* if chunk was present */
 6208                                 }       /* if of sufficient priority */
 6209                         }       /* if chunk has enabled */
 6210                 }               /* tailqforeach */
 6211 
 6212                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 6213                         /* Here we must move to the sent queue and mark */
 6214                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6215                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6216                                         if (chk->data) {
 6217                                                 /*
 6218                                                  * We release the book_size
 6219                                                  * if the mbuf is here
 6220                                                  */
 6221                                                 int ret_spc;
 6222 
 6223                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6224                                                     0, SCTP_SO_LOCKED);
 6225 
 6226                                                 freed_spc += ret_spc;
 6227                                                 if (freed_spc >= dataout) {
 6228                                                         return;
 6229                                                 }
 6230                                         }       /* end if chk->data */
 6231                                 }       /* end if right class */
 6232                         }       /* end if chk pr-sctp */
 6233                 }               /* tailqforeachsafe (chk) */
 6234         }                       /* if enabled in asoc */
 6235 }
 6236 
 6237 int
 6238 sctp_get_frag_point(struct sctp_tcb *stcb,
 6239     struct sctp_association *asoc)
 6240 {
 6241         int siz, ovh;
 6242 
 6243         /*
 6244          * For endpoints that have both v6 and v4 addresses we must reserve
 6245          * room for the ipv6 header, for those that are only dealing with V4
 6246          * we use a larger frag point.
 6247          */
 6248         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 6249                 ovh = SCTP_MIN_OVERHEAD;
 6250         } else {
 6251                 ovh = SCTP_MIN_V4_OVERHEAD;
 6252         }
 6253         if (stcb->asoc.idata_supported) {
 6254                 ovh += sizeof(struct sctp_idata_chunk);
 6255         } else {
 6256                 ovh += sizeof(struct sctp_data_chunk);
 6257         }
 6258         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
 6259                 siz = asoc->smallest_mtu - ovh;
 6260         else
 6261                 siz = (stcb->asoc.sctp_frag_point - ovh);
 6262         /*
 6263          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
 6264          */
 6265         /* A data chunk MUST fit in a cluster */
 6266         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
 6267         /* } */
 6268 
 6269         /* adjust for an AUTH chunk if DATA requires auth */
 6270         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
 6271                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 6272 
 6273         if (siz % 4) {
 6274                 /* make it an even word boundary please */
 6275                 siz -= (siz % 4);
 6276         }
 6277         return (siz);
 6278 }
 6279 
 6280 static void
 6281 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
 6282 {
 6283         /*
 6284          * We assume that the user wants PR_SCTP_TTL if the user provides a
 6285          * positive lifetime but does not specify any PR_SCTP policy.
 6286          */
 6287         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 6288                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6289         } else if (sp->timetolive > 0) {
 6290                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
 6291                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6292         } else {
 6293                 return;
 6294         }
 6295         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 6296         case CHUNK_FLAGS_PR_SCTP_BUF:
 6297                 /*
 6298                  * Time to live is a priority stored in tv_sec when doing
 6299                  * the buffer drop thing.
 6300                  */
 6301                 sp->ts.tv_sec = sp->timetolive;
 6302                 sp->ts.tv_usec = 0;
 6303                 break;
 6304         case CHUNK_FLAGS_PR_SCTP_TTL:
 6305                 {
 6306                         struct timeval tv;
 6307 
 6308                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6309                         tv.tv_sec = sp->timetolive / 1000;
 6310                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 6311                         /*
 6312                          * TODO sctp_constants.h needs alternative time
 6313                          * macros when _KERNEL is undefined.
 6314                          */
 6315                         timevaladd(&sp->ts, &tv);
 6316                 }
 6317                 break;
 6318         case CHUNK_FLAGS_PR_SCTP_RTX:
 6319                 /*
 6320                  * Time to live is a the number or retransmissions stored in
 6321                  * tv_sec.
 6322                  */
 6323                 sp->ts.tv_sec = sp->timetolive;
 6324                 sp->ts.tv_usec = 0;
 6325                 break;
 6326         default:
 6327                 SCTPDBG(SCTP_DEBUG_USRREQ1,
 6328                     "Unknown PR_SCTP policy %u.\n",
 6329                     PR_SCTP_POLICY(sp->sinfo_flags));
 6330                 break;
 6331         }
 6332 }
 6333 
 6334 static int
 6335 sctp_msg_append(struct sctp_tcb *stcb,
 6336     struct sctp_nets *net,
 6337     struct mbuf *m,
 6338     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
 6339 {
 6340         int error = 0;
 6341         struct mbuf *at;
 6342         struct sctp_stream_queue_pending *sp = NULL;
 6343         struct sctp_stream_out *strm;
 6344 
 6345         /*
 6346          * Given an mbuf chain, put it into the association send queue and
 6347          * place it on the wheel
 6348          */
 6349         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 6350                 /* Invalid stream number */
 6351                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6352                 error = EINVAL;
 6353                 goto out_now;
 6354         }
 6355         if ((stcb->asoc.stream_locked) &&
 6356             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 6357                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6358                 error = EINVAL;
 6359                 goto out_now;
 6360         }
 6361         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 6362         /* Now can we send this? */
 6363         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
 6364             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 6365             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 6366             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 6367                 /* got data while shutting down */
 6368                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
 6369                 error = ECONNRESET;
 6370                 goto out_now;
 6371         }
 6372         sctp_alloc_a_strmoq(stcb, sp);
 6373         if (sp == NULL) {
 6374                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6375                 error = ENOMEM;
 6376                 goto out_now;
 6377         }
 6378         sp->sinfo_flags = srcv->sinfo_flags;
 6379         sp->timetolive = srcv->sinfo_timetolive;
 6380         sp->ppid = srcv->sinfo_ppid;
 6381         sp->context = srcv->sinfo_context;
 6382         sp->fsn = 0;
 6383         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 6384                 sp->net = net;
 6385                 atomic_add_int(&sp->net->ref_count, 1);
 6386         } else {
 6387                 sp->net = NULL;
 6388         }
 6389         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6390         sp->sid = srcv->sinfo_stream;
 6391         sp->msg_is_complete = 1;
 6392         sp->sender_all_done = 1;
 6393         sp->some_taken = 0;
 6394         sp->data = m;
 6395         sp->tail_mbuf = NULL;
 6396         sctp_set_prsctp_policy(sp);
 6397         /*
 6398          * We could in theory (for sendall) sifa the length in, but we would
 6399          * still have to hunt through the chain since we need to setup the
 6400          * tail_mbuf
 6401          */
 6402         sp->length = 0;
 6403         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
 6404                 if (SCTP_BUF_NEXT(at) == NULL)
 6405                         sp->tail_mbuf = at;
 6406                 sp->length += SCTP_BUF_LEN(at);
 6407         }
 6408         if (srcv->sinfo_keynumber_valid) {
 6409                 sp->auth_keyid = srcv->sinfo_keynumber;
 6410         } else {
 6411                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
 6412         }
 6413         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
 6414                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
 6415                 sp->holds_key_ref = 1;
 6416         }
 6417         if (hold_stcb_lock == 0) {
 6418                 SCTP_TCB_SEND_LOCK(stcb);
 6419         }
 6420         sctp_snd_sb_alloc(stcb, sp->length);
 6421         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 6422         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 6423         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
 6424         m = NULL;
 6425         if (hold_stcb_lock == 0) {
 6426                 SCTP_TCB_SEND_UNLOCK(stcb);
 6427         }
 6428 out_now:
 6429         if (m) {
 6430                 sctp_m_freem(m);
 6431         }
 6432         return (error);
 6433 }
 6434 
 6435 
 6436 static struct mbuf *
 6437 sctp_copy_mbufchain(struct mbuf *clonechain,
 6438     struct mbuf *outchain,
 6439     struct mbuf **endofchain,
 6440     int can_take_mbuf,
 6441     int sizeofcpy,
 6442     uint8_t copy_by_ref)
 6443 {
 6444         struct mbuf *m;
 6445         struct mbuf *appendchain;
 6446         caddr_t cp;
 6447         int len;
 6448 
 6449         if (endofchain == NULL) {
 6450                 /* error */
 6451 error_out:
 6452                 if (outchain)
 6453                         sctp_m_freem(outchain);
 6454                 return (NULL);
 6455         }
 6456         if (can_take_mbuf) {
 6457                 appendchain = clonechain;
 6458         } else {
 6459                 if (!copy_by_ref &&
 6460                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
 6461                     ) {
 6462                         /* Its not in a cluster */
 6463                         if (*endofchain == NULL) {
 6464                                 /* lets get a mbuf cluster */
 6465                                 if (outchain == NULL) {
 6466                                         /* This is the general case */
 6467                         new_mbuf:
 6468                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6469                                         if (outchain == NULL) {
 6470                                                 goto error_out;
 6471                                         }
 6472                                         SCTP_BUF_LEN(outchain) = 0;
 6473                                         *endofchain = outchain;
 6474                                         /* get the prepend space */
 6475                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 6476                                 } else {
 6477                                         /*
 6478                                          * We really should not get a NULL
 6479                                          * in endofchain
 6480                                          */
 6481                                         /* find end */
 6482                                         m = outchain;
 6483                                         while (m) {
 6484                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6485                                                         *endofchain = m;
 6486                                                         break;
 6487                                                 }
 6488                                                 m = SCTP_BUF_NEXT(m);
 6489                                         }
 6490                                         /* sanity */
 6491                                         if (*endofchain == NULL) {
 6492                                                 /*
 6493                                                  * huh, TSNH XXX maybe we
 6494                                                  * should panic
 6495                                                  */
 6496                                                 sctp_m_freem(outchain);
 6497                                                 goto new_mbuf;
 6498                                         }
 6499                                 }
 6500                                 /* get the new end of length */
 6501                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6502                         } else {
 6503                                 /* how much is left at the end? */
 6504                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6505                         }
 6506                         /* Find the end of the data, for appending */
 6507                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 6508 
 6509                         /* Now lets copy it out */
 6510                         if (len >= sizeofcpy) {
 6511                                 /* It all fits, copy it in */
 6512                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 6513                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6514                         } else {
 6515                                 /* fill up the end of the chain */
 6516                                 if (len > 0) {
 6517                                         m_copydata(clonechain, 0, len, cp);
 6518                                         SCTP_BUF_LEN((*endofchain)) += len;
 6519                                         /* now we need another one */
 6520                                         sizeofcpy -= len;
 6521                                 }
 6522                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6523                                 if (m == NULL) {
 6524                                         /* We failed */
 6525                                         goto error_out;
 6526                                 }
 6527                                 SCTP_BUF_NEXT((*endofchain)) = m;
 6528                                 *endofchain = m;
 6529                                 cp = mtod((*endofchain), caddr_t);
 6530                                 m_copydata(clonechain, len, sizeofcpy, cp);
 6531                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6532                         }
 6533                         return (outchain);
 6534                 } else {
 6535                         /* copy the old fashion way */
 6536                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
 6537 #ifdef SCTP_MBUF_LOGGING
 6538                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6539                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
 6540                         }
 6541 #endif
 6542                 }
 6543         }
 6544         if (appendchain == NULL) {
 6545                 /* error */
 6546                 if (outchain)
 6547                         sctp_m_freem(outchain);
 6548                 return (NULL);
 6549         }
 6550         if (outchain) {
 6551                 /* tack on to the end */
 6552                 if (*endofchain != NULL) {
 6553                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 6554                 } else {
 6555                         m = outchain;
 6556                         while (m) {
 6557                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6558                                         SCTP_BUF_NEXT(m) = appendchain;
 6559                                         break;
 6560                                 }
 6561                                 m = SCTP_BUF_NEXT(m);
 6562                         }
 6563                 }
 6564                 /*
 6565                  * save off the end and update the end-chain position
 6566                  */
 6567                 m = appendchain;
 6568                 while (m) {
 6569                         if (SCTP_BUF_NEXT(m) == NULL) {
 6570                                 *endofchain = m;
 6571                                 break;
 6572                         }
 6573                         m = SCTP_BUF_NEXT(m);
 6574                 }
 6575                 return (outchain);
 6576         } else {
 6577                 /* save off the end and update the end-chain position */
 6578                 m = appendchain;
 6579                 while (m) {
 6580                         if (SCTP_BUF_NEXT(m) == NULL) {
 6581                                 *endofchain = m;
 6582                                 break;
 6583                         }
 6584                         m = SCTP_BUF_NEXT(m);
 6585                 }
 6586                 return (appendchain);
 6587         }
 6588 }
 6589 
 6590 static int
 6591 sctp_med_chunk_output(struct sctp_inpcb *inp,
 6592     struct sctp_tcb *stcb,
 6593     struct sctp_association *asoc,
 6594     int *num_out,
 6595     int *reason_code,
 6596     int control_only, int from_where,
 6597     struct timeval *now, int *now_filled, int frag_point, int so_locked
 6598 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 6599     SCTP_UNUSED
 6600 #endif
 6601 );
 6602 
 6603 static void
 6604 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 6605     uint32_t val SCTP_UNUSED)
 6606 {
 6607         struct sctp_copy_all *ca;
 6608         struct mbuf *m;
 6609         int ret = 0;
 6610         int added_control = 0;
 6611         int un_sent, do_chunk_output = 1;
 6612         struct sctp_association *asoc;
 6613         struct sctp_nets *net;
 6614 
 6615         ca = (struct sctp_copy_all *)ptr;
 6616         if (ca->m == NULL) {
 6617                 return;
 6618         }
 6619         if (ca->inp != inp) {
 6620                 /* TSNH */
 6621                 return;
 6622         }
 6623         if (ca->sndlen > 0) {
 6624                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
 6625                 if (m == NULL) {
 6626                         /* can't copy so we are done */
 6627                         ca->cnt_failed++;
 6628                         return;
 6629                 }
 6630 #ifdef SCTP_MBUF_LOGGING
 6631                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6632                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
 6633                 }
 6634 #endif
 6635         } else {
 6636                 m = NULL;
 6637         }
 6638         SCTP_TCB_LOCK_ASSERT(stcb);
 6639         if (stcb->asoc.alternate) {
 6640                 net = stcb->asoc.alternate;
 6641         } else {
 6642                 net = stcb->asoc.primary_destination;
 6643         }
 6644         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 6645                 /* Abort this assoc with m as the user defined reason */
 6646                 if (m != NULL) {
 6647                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
 6648                 } else {
 6649                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 6650                             0, M_NOWAIT, 1, MT_DATA);
 6651                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
 6652                 }
 6653                 if (m != NULL) {
 6654                         struct sctp_paramhdr *ph;
 6655 
 6656                         ph = mtod(m, struct sctp_paramhdr *);
 6657                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 6658                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
 6659                 }
 6660                 /*
 6661                  * We add one here to keep the assoc from dis-appearing on
 6662                  * us.
 6663                  */
 6664                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6665                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
 6666                 /*
 6667                  * sctp_abort_an_association calls sctp_free_asoc() free
 6668                  * association will NOT free it since we incremented the
 6669                  * refcnt .. we do this to prevent it being freed and things
 6670                  * getting tricky since we could end up (from free_asoc)
 6671                  * calling inpcb_free which would get a recursive lock call
 6672                  * to the iterator lock.. But as a consequence of that the
 6673                  * stcb will return to us un-locked.. since free_asoc
 6674                  * returns with either no TCB or the TCB unlocked, we must
 6675                  * relock.. to unlock in the iterator timer :-0
 6676                  */
 6677                 SCTP_TCB_LOCK(stcb);
 6678                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6679                 goto no_chunk_output;
 6680         } else {
 6681                 if (m) {
 6682                         ret = sctp_msg_append(stcb, net, m,
 6683                             &ca->sndrcv, 1);
 6684                 }
 6685                 asoc = &stcb->asoc;
 6686                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 6687                         /* shutdown this assoc */
 6688                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6689                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6690                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
 6691                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6692                                         goto abort_anyway;
 6693                                 }
 6694                                 /*
 6695                                  * there is nothing queued to send, so I'm
 6696                                  * done...
 6697                                  */
 6698                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 6699                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6700                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6701                                         /*
 6702                                          * only send SHUTDOWN the first time
 6703                                          * through
 6704                                          */
 6705                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 6706                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 6707                                         }
 6708                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 6709                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 6710                                         sctp_stop_timers_for_shutdown(stcb);
 6711                                         sctp_send_shutdown(stcb, net);
 6712                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 6713                                             net);
 6714                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6715                                             asoc->primary_destination);
 6716                                         added_control = 1;
 6717                                         do_chunk_output = 0;
 6718                                 }
 6719                         } else {
 6720                                 /*
 6721                                  * we still got (or just got) data to send,
 6722                                  * so set SHUTDOWN_PENDING
 6723                                  */
 6724                                 /*
 6725                                  * XXX sockets draft says that SCTP_EOF
 6726                                  * should be sent with no data.  currently,
 6727                                  * we will allow user data to be sent first
 6728                                  * and move to SHUTDOWN-PENDING
 6729                                  */
 6730                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 6731                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6732                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6733                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6734                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 6735                                         }
 6736                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
 6737                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6738                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6739                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 6740                                                 struct mbuf *op_err;
 6741                                                 char msg[SCTP_DIAG_INFO_LEN];
 6742 
 6743                                 abort_anyway:
 6744                                                 snprintf(msg, sizeof(msg),
 6745                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
 6746                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 6747                                                     msg);
 6748                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6749                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 6750                                                     op_err, SCTP_SO_NOT_LOCKED);
 6751                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6752                                                 goto no_chunk_output;
 6753                                         }
 6754                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6755                                             asoc->primary_destination);
 6756                                 }
 6757                         }
 6758 
 6759                 }
 6760         }
 6761         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 6762             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
 6763 
 6764         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 6765             (stcb->asoc.total_flight > 0) &&
 6766             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
 6767                 do_chunk_output = 0;
 6768         }
 6769         if (do_chunk_output)
 6770                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 6771         else if (added_control) {
 6772                 int num_out, reason, now_filled = 0;
 6773                 struct timeval now;
 6774                 int frag_point;
 6775 
 6776                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 6777                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 6778                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
 6779         }
 6780 no_chunk_output:
 6781         if (ret) {
 6782                 ca->cnt_failed++;
 6783         } else {
 6784                 ca->cnt_sent++;
 6785         }
 6786 }
 6787 
 6788 static void
 6789 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
 6790 {
 6791         struct sctp_copy_all *ca;
 6792 
 6793         ca = (struct sctp_copy_all *)ptr;
 6794         /*
 6795          * Do a notify here? Kacheong suggests that the notify be done at
 6796          * the send time.. so you would push up a notification if any send
 6797          * failed. Don't know if this is feasible since the only failures we
 6798          * have is "memory" related and if you cannot get an mbuf to send
 6799          * the data you surely can't get an mbuf to send up to notify the
 6800          * user you can't send the data :->
 6801          */
 6802 
 6803         /* now free everything */
 6804         sctp_m_freem(ca->m);
 6805         SCTP_FREE(ca, SCTP_M_COPYAL);
 6806 }
 6807 
 6808 static struct mbuf *
 6809 sctp_copy_out_all(struct uio *uio, int len)
 6810 {
 6811         struct mbuf *ret, *at;
 6812         int left, willcpy, cancpy, error;
 6813 
 6814         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
 6815         if (ret == NULL) {
 6816                 /* TSNH */
 6817                 return (NULL);
 6818         }
 6819         left = len;
 6820         SCTP_BUF_LEN(ret) = 0;
 6821         /* save space for the data chunk header */
 6822         cancpy = (int)M_TRAILINGSPACE(ret);
 6823         willcpy = min(cancpy, left);
 6824         at = ret;
 6825         while (left > 0) {
 6826                 /* Align data to the end */
 6827                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
 6828                 if (error) {
 6829         err_out_now:
 6830                         sctp_m_freem(at);
 6831                         return (NULL);
 6832                 }
 6833                 SCTP_BUF_LEN(at) = willcpy;
 6834                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 6835                 left -= willcpy;
 6836                 if (left > 0) {
 6837                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
 6838                         if (SCTP_BUF_NEXT(at) == NULL) {
 6839                                 goto err_out_now;
 6840                         }
 6841                         at = SCTP_BUF_NEXT(at);
 6842                         SCTP_BUF_LEN(at) = 0;
 6843                         cancpy = (int)M_TRAILINGSPACE(at);
 6844                         willcpy = min(cancpy, left);
 6845                 }
 6846         }
 6847         return (ret);
 6848 }
 6849 
 6850 static int
 6851 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 6852     struct sctp_sndrcvinfo *srcv)
 6853 {
 6854         int ret;
 6855         struct sctp_copy_all *ca;
 6856 
 6857         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 6858             SCTP_M_COPYAL);
 6859         if (ca == NULL) {
 6860                 sctp_m_freem(m);
 6861                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6862                 return (ENOMEM);
 6863         }
 6864         memset(ca, 0, sizeof(struct sctp_copy_all));
 6865 
 6866         ca->inp = inp;
 6867         if (srcv) {
 6868                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 6869         }
 6870         /*
 6871          * take off the sendall flag, it would be bad if we failed to do
 6872          * this :-0
 6873          */
 6874         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 6875         /* get length and mbuf chain */
 6876         if (uio) {
 6877                 ca->sndlen = (int)uio->uio_resid;
 6878                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 6879                 if (ca->m == NULL) {
 6880                         SCTP_FREE(ca, SCTP_M_COPYAL);
 6881                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6882                         return (ENOMEM);
 6883                 }
 6884         } else {
 6885                 /* Gather the length of the send */
 6886                 struct mbuf *mat;
 6887 
 6888                 ca->sndlen = 0;
 6889                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 6890                         ca->sndlen += SCTP_BUF_LEN(mat);
 6891                 }
 6892         }
 6893         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 6894             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 6895             SCTP_ASOC_ANY_STATE,
 6896             (void *)ca, 0,
 6897             sctp_sendall_completes, inp, 1);
 6898         if (ret) {
 6899                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
 6900                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6901                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 6902                 return (EFAULT);
 6903         }
 6904         return (0);
 6905 }
 6906 
 6907 
 6908 void
 6909 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6910 {
 6911         struct sctp_tmit_chunk *chk, *nchk;
 6912 
 6913         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 6914                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 6915                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6916                         if (chk->data) {
 6917                                 sctp_m_freem(chk->data);
 6918                                 chk->data = NULL;
 6919                         }
 6920                         asoc->ctrl_queue_cnt--;
 6921                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6922                 }
 6923         }
 6924 }
 6925 
 6926 void
 6927 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 6928 {
 6929         struct sctp_association *asoc;
 6930         struct sctp_tmit_chunk *chk, *nchk;
 6931         struct sctp_asconf_chunk *acp;
 6932 
 6933         asoc = &stcb->asoc;
 6934         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 6935                 /* find SCTP_ASCONF chunk in queue */
 6936                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 6937                         if (chk->data) {
 6938                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
 6939                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
 6940                                         /* Not Acked yet */
 6941                                         break;
 6942                                 }
 6943                         }
 6944                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
 6945                         if (chk->data) {
 6946                                 sctp_m_freem(chk->data);
 6947                                 chk->data = NULL;
 6948                         }
 6949                         asoc->ctrl_queue_cnt--;
 6950                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6951                 }
 6952         }
 6953 }
 6954 
 6955 
 6956 static void
 6957 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 6958     struct sctp_association *asoc,
 6959     struct sctp_tmit_chunk **data_list,
 6960     int bundle_at,
 6961     struct sctp_nets *net)
 6962 {
 6963         int i;
 6964         struct sctp_tmit_chunk *tp1;
 6965 
 6966         for (i = 0; i < bundle_at; i++) {
 6967                 /* off of the send queue */
 6968                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
 6969                 asoc->send_queue_cnt--;
 6970                 if (i > 0) {
 6971                         /*
 6972                          * Any chunk NOT 0 you zap the time chunk 0 gets
 6973                          * zapped or set based on if a RTO measurment is
 6974                          * needed.
 6975                          */
 6976                         data_list[i]->do_rtt = 0;
 6977                 }
 6978                 /* record time */
 6979                 data_list[i]->sent_rcv_time = net->last_sent_time;
 6980                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
 6981                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
 6982                 if (data_list[i]->whoTo == NULL) {
 6983                         data_list[i]->whoTo = net;
 6984                         atomic_add_int(&net->ref_count, 1);
 6985                 }
 6986                 /* on to the sent queue */
 6987                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 6988                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 6989                         struct sctp_tmit_chunk *tpp;
 6990 
 6991                         /* need to move back */
 6992         back_up_more:
 6993                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 6994                         if (tpp == NULL) {
 6995                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 6996                                 goto all_done;
 6997                         }
 6998                         tp1 = tpp;
 6999                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 7000                                 goto back_up_more;
 7001                         }
 7002                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 7003                 } else {
 7004                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 7005                             data_list[i],
 7006                             sctp_next);
 7007                 }
 7008 all_done:
 7009                 /* This does not lower until the cum-ack passes it */
 7010                 asoc->sent_queue_cnt++;
 7011                 if ((asoc->peers_rwnd <= 0) &&
 7012                     (asoc->total_flight == 0) &&
 7013                     (bundle_at == 1)) {
 7014                         /* Mark the chunk as being a window probe */
 7015                         SCTP_STAT_INCR(sctps_windowprobed);
 7016                 }
 7017 #ifdef SCTP_AUDITING_ENABLED
 7018                 sctp_audit_log(0xC2, 3);
 7019 #endif
 7020                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 7021                 data_list[i]->snd_count = 1;
 7022                 data_list[i]->rec.data.chunk_was_revoked = 0;
 7023                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 7024                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 7025                             data_list[i]->whoTo->flight_size,
 7026                             data_list[i]->book_size,
 7027                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 7028                             data_list[i]->rec.data.tsn);
 7029                 }
 7030                 sctp_flight_size_increase(data_list[i]);
 7031                 sctp_total_flight_increase(stcb, data_list[i]);
 7032                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 7033                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 7034                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 7035                 }
 7036                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 7037                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 7038                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 7039                         /* SWS sender side engages */
 7040                         asoc->peers_rwnd = 0;
 7041                 }
 7042         }
 7043         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
 7044                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
 7045         }
 7046 }
 7047 
 7048 static void
 7049 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
 7050 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7051     SCTP_UNUSED
 7052 #endif
 7053 )
 7054 {
 7055         struct sctp_tmit_chunk *chk, *nchk;
 7056 
 7057         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 7058                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7059                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 7060                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 7061                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 7062                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
 7063                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 7064                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 7065                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 7066                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 7067                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 7068                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 7069                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 7070                         /* Stray chunks must be cleaned up */
 7071         clean_up_anyway:
 7072                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 7073                         if (chk->data) {
 7074                                 sctp_m_freem(chk->data);
 7075                                 chk->data = NULL;
 7076                         }
 7077                         asoc->ctrl_queue_cnt--;
 7078                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
 7079                                 asoc->fwd_tsn_cnt--;
 7080                         sctp_free_a_chunk(stcb, chk, so_locked);
 7081                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 7082                         /* special handling, we must look into the param */
 7083                         if (chk != asoc->str_reset) {
 7084                                 goto clean_up_anyway;
 7085                         }
 7086                 }
 7087         }
 7088 }
 7089 
 7090 static uint32_t
 7091 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
 7092     uint32_t space_left, uint32_t frag_point, int eeor_on)
 7093 {
 7094         /*
 7095          * Make a decision on if I should split a msg into multiple parts.
 7096          * This is only asked of incomplete messages.
 7097          */
 7098         if (eeor_on) {
 7099                 /*
 7100                  * If we are doing EEOR we need to always send it if its the
 7101                  * entire thing, since it might be all the guy is putting in
 7102                  * the hopper.
 7103                  */
 7104                 if (space_left >= length) {
 7105                         /*-
 7106                          * If we have data outstanding,
 7107                          * we get another chance when the sack
 7108                          * arrives to transmit - wait for more data
 7109                          */
 7110                         if (stcb->asoc.total_flight == 0) {
 7111                                 /*
 7112                                  * If nothing is in flight, we zero the
 7113                                  * packet counter.
 7114                                  */
 7115                                 return (length);
 7116                         }
 7117                         return (0);
 7118 
 7119                 } else {
 7120                         /* You can fill the rest */
 7121                         return (space_left);
 7122                 }
 7123         }
 7124         /*-
 7125          * For those strange folk that make the send buffer
 7126          * smaller than our fragmentation point, we can't
 7127          * get a full msg in so we have to allow splitting.
 7128          */
 7129         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 7130                 return (length);
 7131         }
 7132         if ((length <= space_left) ||
 7133             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
 7134                 /* Sub-optimial residual don't split in non-eeor mode. */
 7135                 return (0);
 7136         }
 7137         /*
 7138          * If we reach here length is larger than the space_left. Do we wish
 7139          * to split it for the sake of packet putting together?
 7140          */
 7141         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
 7142                 /* Its ok to split it */
 7143                 return (min(space_left, frag_point));
 7144         }
 7145         /* Nope, can't split */
 7146         return (0);
 7147 }
 7148 
 7149 static uint32_t
 7150 sctp_move_to_outqueue(struct sctp_tcb *stcb,
 7151     struct sctp_stream_out *strq,
 7152     uint32_t space_left,
 7153     uint32_t frag_point,
 7154     int *giveup,
 7155     int eeor_mode,
 7156     int *bail,
 7157     int so_locked
 7158 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7159     SCTP_UNUSED
 7160 #endif
 7161 )
 7162 {
 7163         /* Move from the stream to the send_queue keeping track of the total */
 7164         struct sctp_association *asoc;
 7165         struct sctp_stream_queue_pending *sp;
 7166         struct sctp_tmit_chunk *chk;
 7167         struct sctp_data_chunk *dchkh = NULL;
 7168         struct sctp_idata_chunk *ndchkh = NULL;
 7169         uint32_t to_move, length;
 7170         int leading;
 7171         uint8_t rcv_flags = 0;
 7172         uint8_t some_taken;
 7173         uint8_t send_lock_up = 0;
 7174 
 7175         SCTP_TCB_LOCK_ASSERT(stcb);
 7176         asoc = &stcb->asoc;
 7177 one_more_time:
 7178         /* sa_ignore FREED_MEMORY */
 7179         sp = TAILQ_FIRST(&strq->outqueue);
 7180         if (sp == NULL) {
 7181                 if (send_lock_up == 0) {
 7182                         SCTP_TCB_SEND_LOCK(stcb);
 7183                         send_lock_up = 1;
 7184                 }
 7185                 sp = TAILQ_FIRST(&strq->outqueue);
 7186                 if (sp) {
 7187                         goto one_more_time;
 7188                 }
 7189                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
 7190                     (stcb->asoc.idata_supported == 0) &&
 7191                     (strq->last_msg_incomplete)) {
 7192                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 7193                             strq->sid,
 7194                             strq->last_msg_incomplete);
 7195                         strq->last_msg_incomplete = 0;
 7196                 }
 7197                 to_move = 0;
 7198                 if (send_lock_up) {
 7199                         SCTP_TCB_SEND_UNLOCK(stcb);
 7200                         send_lock_up = 0;
 7201                 }
 7202                 goto out_of;
 7203         }
 7204         if ((sp->msg_is_complete) && (sp->length == 0)) {
 7205                 if (sp->sender_all_done) {
 7206                         /*
 7207                          * We are doing differed cleanup. Last time through
 7208                          * when we took all the data the sender_all_done was
 7209                          * not set.
 7210                          */
 7211                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
 7212                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 7213                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7214                                     sp->sender_all_done,
 7215                                     sp->length,
 7216                                     sp->msg_is_complete,
 7217                                     sp->put_last_out,
 7218                                     send_lock_up);
 7219                         }
 7220                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
 7221                                 SCTP_TCB_SEND_LOCK(stcb);
 7222                                 send_lock_up = 1;
 7223                         }
 7224                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7225                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 7226                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7227                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7228                             (strq->chunks_on_queues == 0) &&
 7229                             TAILQ_EMPTY(&strq->outqueue)) {
 7230                                 stcb->asoc.trigger_reset = 1;
 7231                         }
 7232                         if (sp->net) {
 7233                                 sctp_free_remote_addr(sp->net);
 7234                                 sp->net = NULL;
 7235                         }
 7236                         if (sp->data) {
 7237                                 sctp_m_freem(sp->data);
 7238                                 sp->data = NULL;
 7239                         }
 7240                         sctp_free_a_strmoq(stcb, sp, so_locked);
 7241                         /* we can't be locked to it */
 7242                         if (send_lock_up) {
 7243                                 SCTP_TCB_SEND_UNLOCK(stcb);
 7244                                 send_lock_up = 0;
 7245                         }
 7246                         /* back to get the next msg */
 7247                         goto one_more_time;
 7248                 } else {
 7249                         /*
 7250                          * sender just finished this but still holds a
 7251                          * reference
 7252                          */
 7253                         *giveup = 1;
 7254                         to_move = 0;
 7255                         goto out_of;
 7256                 }
 7257         } else {
 7258                 /* is there some to get */
 7259                 if (sp->length == 0) {
 7260                         /* no */
 7261                         *giveup = 1;
 7262                         to_move = 0;
 7263                         goto out_of;
 7264                 } else if (sp->discard_rest) {
 7265                         if (send_lock_up == 0) {
 7266                                 SCTP_TCB_SEND_LOCK(stcb);
 7267                                 send_lock_up = 1;
 7268                         }
 7269                         /* Whack down the size */
 7270                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
 7271                         if ((stcb->sctp_socket != NULL) &&
 7272                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 7273                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
 7274                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
 7275                         }
 7276                         if (sp->data) {
 7277                                 sctp_m_freem(sp->data);
 7278                                 sp->data = NULL;
 7279                                 sp->tail_mbuf = NULL;
 7280                         }
 7281                         sp->length = 0;
 7282                         sp->some_taken = 1;
 7283                         *giveup = 1;
 7284                         to_move = 0;
 7285                         goto out_of;
 7286                 }
 7287         }
 7288         some_taken = sp->some_taken;
 7289 re_look:
 7290         length = sp->length;
 7291         if (sp->msg_is_complete) {
 7292                 /* The message is complete */
 7293                 to_move = min(length, frag_point);
 7294                 if (to_move == length) {
 7295                         /* All of it fits in the MTU */
 7296                         if (sp->some_taken) {
 7297                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 7298                         } else {
 7299                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 7300                         }
 7301                         sp->put_last_out = 1;
 7302                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
 7303                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7304                         }
 7305                 } else {
 7306                         /* Not all of it fits, we fragment */
 7307                         if (sp->some_taken == 0) {
 7308                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7309                         }
 7310                         sp->some_taken = 1;
 7311                 }
 7312         } else {
 7313                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
 7314                 if (to_move) {
 7315                         /*-
 7316                          * We use a snapshot of length in case it
 7317                          * is expanding during the compare.
 7318                          */
 7319                         uint32_t llen;
 7320 
 7321                         llen = length;
 7322                         if (to_move >= llen) {
 7323                                 to_move = llen;
 7324                                 if (send_lock_up == 0) {
 7325                                         /*-
 7326                                          * We are taking all of an incomplete msg
 7327                                          * thus we need a send lock.
 7328                                          */
 7329                                         SCTP_TCB_SEND_LOCK(stcb);
 7330                                         send_lock_up = 1;
 7331                                         if (sp->msg_is_complete) {
 7332                                                 /*
 7333                                                  * the sender finished the
 7334                                                  * msg
 7335                                                  */
 7336                                                 goto re_look;
 7337                                         }
 7338                                 }
 7339                         }
 7340                         if (sp->some_taken == 0) {
 7341                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7342                                 sp->some_taken = 1;
 7343                         }
 7344                 } else {
 7345                         /* Nothing to take. */
 7346                         *giveup = 1;
 7347                         to_move = 0;
 7348                         goto out_of;
 7349                 }
 7350         }
 7351 
 7352         /* If we reach here, we can copy out a chunk */
 7353         sctp_alloc_a_chunk(stcb, chk);
 7354         if (chk == NULL) {
 7355                 /* No chunk memory */
 7356                 *giveup = 1;
 7357                 to_move = 0;
 7358                 goto out_of;
 7359         }
 7360         /*
 7361          * Setup for unordered if needed by looking at the user sent info
 7362          * flags.
 7363          */
 7364         if (sp->sinfo_flags & SCTP_UNORDERED) {
 7365                 rcv_flags |= SCTP_DATA_UNORDERED;
 7366         }
 7367         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 7368             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
 7369                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7370         }
 7371         /* clear out the chunk before setting up */
 7372         memset(chk, 0, sizeof(*chk));
 7373         chk->rec.data.rcv_flags = rcv_flags;
 7374 
 7375         if (to_move >= length) {
 7376                 /* we think we can steal the whole thing */
 7377                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
 7378                         SCTP_TCB_SEND_LOCK(stcb);
 7379                         send_lock_up = 1;
 7380                 }
 7381                 if (to_move < sp->length) {
 7382                         /* bail, it changed */
 7383                         goto dont_do_it;
 7384                 }
 7385                 chk->data = sp->data;
 7386                 chk->last_mbuf = sp->tail_mbuf;
 7387                 /* register the stealing */
 7388                 sp->data = sp->tail_mbuf = NULL;
 7389         } else {
 7390                 struct mbuf *m;
 7391 
 7392 dont_do_it:
 7393                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
 7394                 chk->last_mbuf = NULL;
 7395                 if (chk->data == NULL) {
 7396                         sp->some_taken = some_taken;
 7397                         sctp_free_a_chunk(stcb, chk, so_locked);
 7398                         *bail = 1;
 7399                         to_move = 0;
 7400                         goto out_of;
 7401                 }
 7402 #ifdef SCTP_MBUF_LOGGING
 7403                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7404                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
 7405                 }
 7406 #endif
 7407                 /* Pull off the data */
 7408                 m_adj(sp->data, to_move);
 7409                 /* Now lets work our way down and compact it */
 7410                 m = sp->data;
 7411                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 7412                         sp->data = SCTP_BUF_NEXT(m);
 7413                         SCTP_BUF_NEXT(m) = NULL;
 7414                         if (sp->tail_mbuf == m) {
 7415                                 /*-
 7416                                  * Freeing tail? TSNH since
 7417                                  * we supposedly were taking less
 7418                                  * than the sp->length.
 7419                                  */
 7420 #ifdef INVARIANTS
 7421                                 panic("Huh, freing tail? - TSNH");
 7422 #else
 7423                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 7424                                 sp->tail_mbuf = sp->data = NULL;
 7425                                 sp->length = 0;
 7426 #endif
 7427 
 7428                         }
 7429                         sctp_m_free(m);
 7430                         m = sp->data;
 7431                 }
 7432         }
 7433         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 7434                 chk->copy_by_ref = 1;
 7435         } else {
 7436                 chk->copy_by_ref = 0;
 7437         }
 7438         /*
 7439          * get last_mbuf and counts of mb usage This is ugly but hopefully
 7440          * its only one mbuf.
 7441          */
 7442         if (chk->last_mbuf == NULL) {
 7443                 chk->last_mbuf = chk->data;
 7444                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 7445                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 7446                 }
 7447         }
 7448         if (to_move > length) {
 7449                 /*- This should not happen either
 7450                  * since we always lower to_move to the size
 7451                  * of sp->length if its larger.
 7452                  */
 7453 #ifdef INVARIANTS
 7454                 panic("Huh, how can to_move be larger?");
 7455 #else
 7456                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 7457                 sp->length = 0;
 7458 #endif
 7459         } else {
 7460                 atomic_subtract_int(&sp->length, to_move);
 7461         }
 7462         if (stcb->asoc.idata_supported == 0) {
 7463                 leading = sizeof(struct sctp_data_chunk);
 7464         } else {
 7465                 leading = sizeof(struct sctp_idata_chunk);
 7466         }
 7467         if (M_LEADINGSPACE(chk->data) < leading) {
 7468                 /* Not enough room for a chunk header, get some */
 7469                 struct mbuf *m;
 7470 
 7471                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
 7472                 if (m == NULL) {
 7473                         /*
 7474                          * we're in trouble here. _PREPEND below will free
 7475                          * all the data if there is no leading space, so we
 7476                          * must put the data back and restore.
 7477                          */
 7478                         if (send_lock_up == 0) {
 7479                                 SCTP_TCB_SEND_LOCK(stcb);
 7480                                 send_lock_up = 1;
 7481                         }
 7482                         if (sp->data == NULL) {
 7483                                 /* unsteal the data */
 7484                                 sp->data = chk->data;
 7485                                 sp->tail_mbuf = chk->last_mbuf;
 7486                         } else {
 7487                                 struct mbuf *m_tmp;
 7488 
 7489                                 /* reassemble the data */
 7490                                 m_tmp = sp->data;
 7491                                 sp->data = chk->data;
 7492                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 7493                         }
 7494                         sp->some_taken = some_taken;
 7495                         atomic_add_int(&sp->length, to_move);
 7496                         chk->data = NULL;
 7497                         *bail = 1;
 7498                         sctp_free_a_chunk(stcb, chk, so_locked);
 7499                         to_move = 0;
 7500                         goto out_of;
 7501                 } else {
 7502                         SCTP_BUF_LEN(m) = 0;
 7503                         SCTP_BUF_NEXT(m) = chk->data;
 7504                         chk->data = m;
 7505                         M_ALIGN(chk->data, 4);
 7506                 }
 7507         }
 7508         if (stcb->asoc.idata_supported == 0) {
 7509                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
 7510         } else {
 7511                 SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_idata_chunk), M_NOWAIT);
 7512         }
 7513         if (chk->data == NULL) {
 7514                 /* HELP, TSNH since we assured it would not above? */
 7515 #ifdef INVARIANTS
 7516                 panic("prepend failes HELP?");
 7517 #else
 7518                 SCTP_PRINTF("prepend fails HELP?\n");
 7519                 sctp_free_a_chunk(stcb, chk, so_locked);
 7520 #endif
 7521                 *bail = 1;
 7522                 to_move = 0;
 7523                 goto out_of;
 7524         }
 7525         if (stcb->asoc.idata_supported == 0) {
 7526                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
 7527                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_data_chunk));
 7528         } else {
 7529                 sctp_snd_sb_alloc(stcb, sizeof(struct sctp_idata_chunk));
 7530                 chk->book_size = chk->send_size = (uint16_t)(to_move + sizeof(struct sctp_idata_chunk));
 7531         }
 7532         chk->book_size_scale = 0;
 7533         chk->sent = SCTP_DATAGRAM_UNSENT;
 7534 
 7535         chk->flags = 0;
 7536         chk->asoc = &stcb->asoc;
 7537         chk->pad_inplace = 0;
 7538         chk->no_fr_allowed = 0;
 7539         if (stcb->asoc.idata_supported == 0) {
 7540                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7541                         /* Just use 0. The receiver ignores the values. */
 7542                         chk->rec.data.mid = 0;
 7543                 } else {
 7544                         chk->rec.data.mid = strq->next_mid_ordered;
 7545                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7546                                 strq->next_mid_ordered++;
 7547                         }
 7548                 }
 7549         } else {
 7550                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7551                         chk->rec.data.mid = strq->next_mid_unordered;
 7552                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7553                                 strq->next_mid_unordered++;
 7554                         }
 7555                 } else {
 7556                         chk->rec.data.mid = strq->next_mid_ordered;
 7557                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7558                                 strq->next_mid_ordered++;
 7559                         }
 7560                 }
 7561         }
 7562         chk->rec.data.sid = sp->sid;
 7563         chk->rec.data.ppid = sp->ppid;
 7564         chk->rec.data.context = sp->context;
 7565         chk->rec.data.doing_fast_retransmit = 0;
 7566 
 7567         chk->rec.data.timetodrop = sp->ts;
 7568         chk->flags = sp->act_flags;
 7569 
 7570         if (sp->net) {
 7571                 chk->whoTo = sp->net;
 7572                 atomic_add_int(&chk->whoTo->ref_count, 1);
 7573         } else
 7574                 chk->whoTo = NULL;
 7575 
 7576         if (sp->holds_key_ref) {
 7577                 chk->auth_keyid = sp->auth_keyid;
 7578                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
 7579                 chk->holds_key_ref = 1;
 7580         }
 7581         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
 7582         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
 7583                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 7584                     (uint32_t)(uintptr_t)stcb, sp->length,
 7585                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
 7586                     chk->rec.data.tsn);
 7587         }
 7588         if (stcb->asoc.idata_supported == 0) {
 7589                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
 7590         } else {
 7591                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
 7592         }
 7593         /*
 7594          * Put the rest of the things in place now. Size was done earlier in
 7595          * previous loop prior to padding.
 7596          */
 7597 
 7598 #ifdef SCTP_ASOCLOG_OF_TSNS
 7599         SCTP_TCB_LOCK_ASSERT(stcb);
 7600         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 7601                 asoc->tsn_out_at = 0;
 7602                 asoc->tsn_out_wrapped = 1;
 7603         }
 7604         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
 7605         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
 7606         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
 7607         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 7608         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 7609         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 7610         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 7611         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 7612         asoc->tsn_out_at++;
 7613 #endif
 7614         if (stcb->asoc.idata_supported == 0) {
 7615                 dchkh->ch.chunk_type = SCTP_DATA;
 7616                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7617                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7618                 dchkh->dp.sid = htons(strq->sid);
 7619                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
 7620                 dchkh->dp.ppid = chk->rec.data.ppid;
 7621                 dchkh->ch.chunk_length = htons(chk->send_size);
 7622         } else {
 7623                 ndchkh->ch.chunk_type = SCTP_IDATA;
 7624                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7625                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7626                 ndchkh->dp.sid = htons(strq->sid);
 7627                 ndchkh->dp.reserved = htons(0);
 7628                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
 7629                 if (sp->fsn == 0)
 7630                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
 7631                 else
 7632                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
 7633                 sp->fsn++;
 7634                 ndchkh->ch.chunk_length = htons(chk->send_size);
 7635         }
 7636         /* Now advance the chk->send_size by the actual pad needed. */
 7637         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 7638                 /* need a pad */
 7639                 struct mbuf *lm;
 7640                 int pads;
 7641 
 7642                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 7643                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
 7644                 if (lm != NULL) {
 7645                         chk->last_mbuf = lm;
 7646                         chk->pad_inplace = 1;
 7647                 }
 7648                 chk->send_size += pads;
 7649         }
 7650         if (PR_SCTP_ENABLED(chk->flags)) {
 7651                 asoc->pr_sctp_cnt++;
 7652         }
 7653         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 7654                 /* All done pull and kill the message */
 7655                 if (sp->put_last_out == 0) {
 7656                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 7657                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7658                             sp->sender_all_done,
 7659                             sp->length,
 7660                             sp->msg_is_complete,
 7661                             sp->put_last_out,
 7662                             send_lock_up);
 7663                 }
 7664                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
 7665                         SCTP_TCB_SEND_LOCK(stcb);
 7666                         send_lock_up = 1;
 7667                 }
 7668                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7669                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 7670                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7671                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7672                     (strq->chunks_on_queues == 0) &&
 7673                     TAILQ_EMPTY(&strq->outqueue)) {
 7674                         stcb->asoc.trigger_reset = 1;
 7675                 }
 7676                 if (sp->net) {
 7677                         sctp_free_remote_addr(sp->net);
 7678                         sp->net = NULL;
 7679                 }
 7680                 if (sp->data) {
 7681                         sctp_m_freem(sp->data);
 7682                         sp->data = NULL;
 7683                 }
 7684                 sctp_free_a_strmoq(stcb, sp, so_locked);
 7685         }
 7686         asoc->chunks_on_out_queue++;
 7687         strq->chunks_on_queues++;
 7688         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 7689         asoc->send_queue_cnt++;
 7690 out_of:
 7691         if (send_lock_up) {
 7692                 SCTP_TCB_SEND_UNLOCK(stcb);
 7693         }
 7694         return (to_move);
 7695 }
 7696 
 7697 
 7698 static void
 7699 sctp_fill_outqueue(struct sctp_tcb *stcb,
 7700     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
 7701 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7702     SCTP_UNUSED
 7703 #endif
 7704 )
 7705 {
 7706         struct sctp_association *asoc;
 7707         struct sctp_stream_out *strq;
 7708         uint32_t space_left, moved, total_moved;
 7709         int bail, giveup;
 7710 
 7711         SCTP_TCB_LOCK_ASSERT(stcb);
 7712         asoc = &stcb->asoc;
 7713         total_moved = 0;
 7714         switch (net->ro._l_addr.sa.sa_family) {
 7715 #ifdef INET
 7716         case AF_INET:
 7717                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
 7718                 break;
 7719 #endif
 7720 #ifdef INET6
 7721         case AF_INET6:
 7722                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
 7723                 break;
 7724 #endif
 7725         default:
 7726                 /* TSNH */
 7727                 space_left = net->mtu;
 7728                 break;
 7729         }
 7730         /* Need an allowance for the data chunk header too */
 7731         if (stcb->asoc.idata_supported == 0) {
 7732                 space_left -= sizeof(struct sctp_data_chunk);
 7733         } else {
 7734                 space_left -= sizeof(struct sctp_idata_chunk);
 7735         }
 7736 
 7737         /* must make even word boundary */
 7738         space_left &= 0xfffffffc;
 7739         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7740         giveup = 0;
 7741         bail = 0;
 7742         while ((space_left > 0) && (strq != NULL)) {
 7743                 moved = sctp_move_to_outqueue(stcb, strq, space_left, frag_point,
 7744                     &giveup, eeor_mode, &bail, so_locked);
 7745                 stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved);
 7746                 if ((giveup != 0) || (bail != 0)) {
 7747                         break;
 7748                 }
 7749                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7750                 total_moved += moved;
 7751                 space_left -= moved;
 7752                 if (stcb->asoc.idata_supported == 0) {
 7753                         if (space_left >= sizeof(struct sctp_data_chunk)) {
 7754                                 space_left -= sizeof(struct sctp_data_chunk);
 7755                         } else {
 7756                                 space_left = 0;
 7757                         }
 7758                 } else {
 7759                         if (space_left >= sizeof(struct sctp_idata_chunk)) {
 7760                                 space_left -= sizeof(struct sctp_idata_chunk);
 7761                         } else {
 7762                                 space_left = 0;
 7763                         }
 7764                 }
 7765                 space_left &= 0xfffffffc;
 7766         }
 7767         if (bail != 0)
 7768                 *quit_now = 1;
 7769 
 7770         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
 7771 
 7772         if (total_moved == 0) {
 7773                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
 7774                     (net == stcb->asoc.primary_destination)) {
 7775                         /* ran dry for primary network net */
 7776                         SCTP_STAT_INCR(sctps_primary_randry);
 7777                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
 7778                         /* ran dry with CMT on */
 7779                         SCTP_STAT_INCR(sctps_cmt_randry);
 7780                 }
 7781         }
 7782 }
 7783 
 7784 void
 7785 sctp_fix_ecn_echo(struct sctp_association *asoc)
 7786 {
 7787         struct sctp_tmit_chunk *chk;
 7788 
 7789         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7790                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 7791                         chk->sent = SCTP_DATAGRAM_UNSENT;
 7792                 }
 7793         }
 7794 }
 7795 
 7796 void
 7797 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
 7798 {
 7799         struct sctp_association *asoc;
 7800         struct sctp_tmit_chunk *chk;
 7801         struct sctp_stream_queue_pending *sp;
 7802         unsigned int i;
 7803 
 7804         if (net == NULL) {
 7805                 return;
 7806         }
 7807         asoc = &stcb->asoc;
 7808         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 7809                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 7810                         if (sp->net == net) {
 7811                                 sctp_free_remote_addr(sp->net);
 7812                                 sp->net = NULL;
 7813                         }
 7814                 }
 7815         }
 7816         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7817                 if (chk->whoTo == net) {
 7818                         sctp_free_remote_addr(chk->whoTo);
 7819                         chk->whoTo = NULL;
 7820                 }
 7821         }
 7822 }
 7823 
 7824 int
 7825 sctp_med_chunk_output(struct sctp_inpcb *inp,
 7826     struct sctp_tcb *stcb,
 7827     struct sctp_association *asoc,
 7828     int *num_out,
 7829     int *reason_code,
 7830     int control_only, int from_where,
 7831     struct timeval *now, int *now_filled, int frag_point, int so_locked
 7832 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7833     SCTP_UNUSED
 7834 #endif
 7835 )
 7836 {
 7837         /**
 7838          * Ok this is the generic chunk service queue. we must do the
 7839          * following:
 7840          * - Service the stream queue that is next, moving any
 7841          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
 7842          *   LAST to the out queue in one pass) and assigning TSN's. This
 7843          *   only applys though if the peer does not support NDATA. For NDATA
 7844          *   chunks its ok to not send the entire message ;-)
 7845          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
 7846          *   fomulate and send the low level chunks. Making sure to combine
 7847          *   any control in the control chunk queue also.
 7848          */
 7849         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
 7850         struct mbuf *outchain, *endoutchain;
 7851         struct sctp_tmit_chunk *chk, *nchk;
 7852 
 7853         /* temp arrays for unlinking */
 7854         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 7855         int no_fragmentflg, error;
 7856         unsigned int max_rwnd_per_dest, max_send_per_dest;
 7857         int one_chunk, hbflag, skip_data_for_this_net;
 7858         int asconf, cookie, no_out_cnt;
 7859         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
 7860         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 7861         int tsns_sent = 0;
 7862         uint32_t auth_offset = 0;
 7863         struct sctp_auth_chunk *auth = NULL;
 7864         uint16_t auth_keyid;
 7865         int override_ok = 1;
 7866         int skip_fill_up = 0;
 7867         int data_auth_reqd = 0;
 7868 
 7869         /*
 7870          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 7871          * destination.
 7872          */
 7873         int quit_now = 0;
 7874 
 7875         *num_out = 0;
 7876         *reason_code = 0;
 7877         auth_keyid = stcb->asoc.authinfo.active_keyid;
 7878         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 7879             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
 7880             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 7881                 eeor_mode = 1;
 7882         } else {
 7883                 eeor_mode = 0;
 7884         }
 7885         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 7886         /*
 7887          * First lets prime the pump. For each destination, if there is room
 7888          * in the flight size, attempt to pull an MTU's worth out of the
 7889          * stream queues into the general send_queue
 7890          */
 7891 #ifdef SCTP_AUDITING_ENABLED
 7892         sctp_audit_log(0xC2, 2);
 7893 #endif
 7894         SCTP_TCB_LOCK_ASSERT(stcb);
 7895         hbflag = 0;
 7896         if (control_only)
 7897                 no_data_chunks = 1;
 7898         else
 7899                 no_data_chunks = 0;
 7900 
 7901         /* Nothing to possible to send? */
 7902         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
 7903             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
 7904             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7905             TAILQ_EMPTY(&asoc->send_queue) &&
 7906             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
 7907 nothing_to_send:
 7908                 *reason_code = 9;
 7909                 return (0);
 7910         }
 7911         if (asoc->peers_rwnd == 0) {
 7912                 /* No room in peers rwnd */
 7913                 *reason_code = 1;
 7914                 if (asoc->total_flight > 0) {
 7915                         /* we are allowed one chunk in flight */
 7916                         no_data_chunks = 1;
 7917                 }
 7918         }
 7919         if (stcb->asoc.ecn_echo_cnt_onq) {
 7920                 /* Record where a sack goes, if any */
 7921                 if (no_data_chunks &&
 7922                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
 7923                         /* Nothing but ECNe to send - we don't do that */
 7924                         goto nothing_to_send;
 7925                 }
 7926                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7927                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7928                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 7929                                 sack_goes_to = chk->whoTo;
 7930                                 break;
 7931                         }
 7932                 }
 7933         }
 7934         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
 7935         if (stcb->sctp_socket)
 7936                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
 7937         else
 7938                 max_send_per_dest = 0;
 7939         if (no_data_chunks == 0) {
 7940                 /* How many non-directed chunks are there? */
 7941                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7942                         if (chk->whoTo == NULL) {
 7943                                 /*
 7944                                  * We already have non-directed chunks on
 7945                                  * the queue, no need to do a fill-up.
 7946                                  */
 7947                                 skip_fill_up = 1;
 7948                                 break;
 7949                         }
 7950                 }
 7951 
 7952         }
 7953         if ((no_data_chunks == 0) &&
 7954             (skip_fill_up == 0) &&
 7955             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
 7956                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 7957                         /*
 7958                          * This for loop we are in takes in each net, if
 7959                          * its's got space in cwnd and has data sent to it
 7960                          * (when CMT is off) then it calls
 7961                          * sctp_fill_outqueue for the net. This gets data on
 7962                          * the send queue for that network.
 7963                          *
 7964                          * In sctp_fill_outqueue TSN's are assigned and data
 7965                          * is copied out of the stream buffers. Note mostly
 7966                          * copy by reference (we hope).
 7967                          */
 7968                         net->window_probe = 0;
 7969                         if ((net != stcb->asoc.alternate) &&
 7970                             ((net->dest_state & SCTP_ADDR_PF) ||
 7971                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 7972                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 7973                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7974                                         sctp_log_cwnd(stcb, net, 1,
 7975                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7976                                 }
 7977                                 continue;
 7978                         }
 7979                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 7980                             (net->flight_size == 0)) {
 7981                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 7982                         }
 7983                         if (net->flight_size >= net->cwnd) {
 7984                                 /* skip this network, no room - can't fill */
 7985                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7986                                         sctp_log_cwnd(stcb, net, 3,
 7987                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7988                                 }
 7989                                 continue;
 7990                         }
 7991                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7992                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7993                         }
 7994                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
 7995                         if (quit_now) {
 7996                                 /* memory alloc failure */
 7997                                 no_data_chunks = 1;
 7998                                 break;
 7999                         }
 8000                 }
 8001         }
 8002         /* now service each destination and send out what we can for it */
 8003         /* Nothing to send? */
 8004         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 8005             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 8006             TAILQ_EMPTY(&asoc->send_queue)) {
 8007                 *reason_code = 8;
 8008                 return (0);
 8009         }
 8010         if (asoc->sctp_cmt_on_off > 0) {
 8011                 /* get the last start point */
 8012                 start_at = asoc->last_net_cmt_send_started;
 8013                 if (start_at == NULL) {
 8014                         /* null so to beginning */
 8015                         start_at = TAILQ_FIRST(&asoc->nets);
 8016                 } else {
 8017                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
 8018                         if (start_at == NULL) {
 8019                                 start_at = TAILQ_FIRST(&asoc->nets);
 8020                         }
 8021                 }
 8022                 asoc->last_net_cmt_send_started = start_at;
 8023         } else {
 8024                 start_at = TAILQ_FIRST(&asoc->nets);
 8025         }
 8026         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 8027                 if (chk->whoTo == NULL) {
 8028                         if (asoc->alternate) {
 8029                                 chk->whoTo = asoc->alternate;
 8030                         } else {
 8031                                 chk->whoTo = asoc->primary_destination;
 8032                         }
 8033                         atomic_add_int(&chk->whoTo->ref_count, 1);
 8034                 }
 8035         }
 8036         old_start_at = NULL;
 8037 again_one_more_time:
 8038         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 8039                 /* how much can we send? */
 8040                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 8041                 if (old_start_at && (old_start_at == net)) {
 8042                         /* through list ocmpletely. */
 8043                         break;
 8044                 }
 8045                 tsns_sent = 0xa;
 8046                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 8047                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 8048                     (net->flight_size >= net->cwnd)) {
 8049                         /*
 8050                          * Nothing on control or asconf and flight is full,
 8051                          * we can skip even in the CMT case.
 8052                          */
 8053                         continue;
 8054                 }
 8055                 bundle_at = 0;
 8056                 endoutchain = outchain = NULL;
 8057                 no_fragmentflg = 1;
 8058                 one_chunk = 0;
 8059                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 8060                         skip_data_for_this_net = 1;
 8061                 } else {
 8062                         skip_data_for_this_net = 0;
 8063                 }
 8064                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8065 #ifdef INET
 8066                 case AF_INET:
 8067                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8068                         break;
 8069 #endif
 8070 #ifdef INET6
 8071                 case AF_INET6:
 8072                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8073                         break;
 8074 #endif
 8075                 default:
 8076                         /* TSNH */
 8077                         mtu = net->mtu;
 8078                         break;
 8079                 }
 8080                 mx_mtu = mtu;
 8081                 to_out = 0;
 8082                 if (mtu > asoc->peers_rwnd) {
 8083                         if (asoc->total_flight > 0) {
 8084                                 /* We have a packet in flight somewhere */
 8085                                 r_mtu = asoc->peers_rwnd;
 8086                         } else {
 8087                                 /* We are always allowed to send one MTU out */
 8088                                 one_chunk = 1;
 8089                                 r_mtu = mtu;
 8090                         }
 8091                 } else {
 8092                         r_mtu = mtu;
 8093                 }
 8094                 error = 0;
 8095                 /************************/
 8096                 /* ASCONF transmission */
 8097                 /************************/
 8098                 /* Now first lets go through the asconf queue */
 8099                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 8100                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
 8101                                 continue;
 8102                         }
 8103                         if (chk->whoTo == NULL) {
 8104                                 if (asoc->alternate == NULL) {
 8105                                         if (asoc->primary_destination != net) {
 8106                                                 break;
 8107                                         }
 8108                                 } else {
 8109                                         if (asoc->alternate != net) {
 8110                                                 break;
 8111                                         }
 8112                                 }
 8113                         } else {
 8114                                 if (chk->whoTo != net) {
 8115                                         break;
 8116                                 }
 8117                         }
 8118                         if (chk->data == NULL) {
 8119                                 break;
 8120                         }
 8121                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
 8122                             chk->sent != SCTP_DATAGRAM_RESEND) {
 8123                                 break;
 8124                         }
 8125                         /*
 8126                          * if no AUTH is yet included and this chunk
 8127                          * requires it, make sure to account for it.  We
 8128                          * don't apply the size until the AUTH chunk is
 8129                          * actually added below in case there is no room for
 8130                          * this chunk. NOTE: we overload the use of "omtu"
 8131                          * here
 8132                          */
 8133                         if ((auth == NULL) &&
 8134                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8135                             stcb->asoc.peer_auth_chunks)) {
 8136                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8137                         } else
 8138                                 omtu = 0;
 8139                         /* Here we do NOT factor the r_mtu */
 8140                         if ((chk->send_size < (int)(mtu - omtu)) ||
 8141                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8142                                 /*
 8143                                  * We probably should glom the mbuf chain
 8144                                  * from the chk->data for control but the
 8145                                  * problem is it becomes yet one more level
 8146                                  * of tracking to do if for some reason
 8147                                  * output fails. Then I have got to
 8148                                  * reconstruct the merged control chain.. el
 8149                                  * yucko.. for now we take the easy way and
 8150                                  * do the copy
 8151                                  */
 8152                                 /*
 8153                                  * Add an AUTH chunk, if chunk requires it
 8154                                  * save the offset into the chain for AUTH
 8155                                  */
 8156                                 if ((auth == NULL) &&
 8157                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8158                                     stcb->asoc.peer_auth_chunks))) {
 8159                                         outchain = sctp_add_auth_chunk(outchain,
 8160                                             &endoutchain,
 8161                                             &auth,
 8162                                             &auth_offset,
 8163                                             stcb,
 8164                                             chk->rec.chunk_id.id);
 8165                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8166                                 }
 8167                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8168                                     (int)chk->rec.chunk_id.can_take_data,
 8169                                     chk->send_size, chk->copy_by_ref);
 8170                                 if (outchain == NULL) {
 8171                                         *reason_code = 8;
 8172                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8173                                         return (ENOMEM);
 8174                                 }
 8175                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8176                                 /* update our MTU size */
 8177                                 if (mtu > (chk->send_size + omtu))
 8178                                         mtu -= (chk->send_size + omtu);
 8179                                 else
 8180                                         mtu = 0;
 8181                                 to_out += (chk->send_size + omtu);
 8182                                 /* Do clear IP_DF ? */
 8183                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8184                                         no_fragmentflg = 0;
 8185                                 }
 8186                                 if (chk->rec.chunk_id.can_take_data)
 8187                                         chk->data = NULL;
 8188                                 /*
 8189                                  * set hb flag since we can use these for
 8190                                  * RTO
 8191                                  */
 8192                                 hbflag = 1;
 8193                                 asconf = 1;
 8194                                 /*
 8195                                  * should sysctl this: don't bundle data
 8196                                  * with ASCONF since it requires AUTH
 8197                                  */
 8198                                 no_data_chunks = 1;
 8199                                 chk->sent = SCTP_DATAGRAM_SENT;
 8200                                 if (chk->whoTo == NULL) {
 8201                                         chk->whoTo = net;
 8202                                         atomic_add_int(&net->ref_count, 1);
 8203                                 }
 8204                                 chk->snd_count++;
 8205                                 if (mtu == 0) {
 8206                                         /*
 8207                                          * Ok we are out of room but we can
 8208                                          * output without effecting the
 8209                                          * flight size since this little guy
 8210                                          * is a control only packet.
 8211                                          */
 8212                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8213                                         /*
 8214                                          * do NOT clear the asconf flag as
 8215                                          * it is used to do appropriate
 8216                                          * source address selection.
 8217                                          */
 8218                                         if (*now_filled == 0) {
 8219                                                 (void)SCTP_GETTIME_TIMEVAL(now);
 8220                                                 *now_filled = 1;
 8221                                         }
 8222                                         net->last_sent_time = *now;
 8223                                         hbflag = 0;
 8224                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8225                                             (struct sockaddr *)&net->ro._l_addr,
 8226                                             outchain, auth_offset, auth,
 8227                                             stcb->asoc.authinfo.active_keyid,
 8228                                             no_fragmentflg, 0, asconf,
 8229                                             inp->sctp_lport, stcb->rport,
 8230                                             htonl(stcb->asoc.peer_vtag),
 8231                                             net->port, NULL,
 8232                                             0, 0,
 8233                                             so_locked))) {
 8234                                                 /*
 8235                                                  * error, we could not
 8236                                                  * output
 8237                                                  */
 8238                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8239                                                 if (from_where == 0) {
 8240                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8241                                                 }
 8242                                                 if (error == ENOBUFS) {
 8243                                                         asoc->ifp_had_enobuf = 1;
 8244                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8245                                                 }
 8246                                                 /* error, could not output */
 8247                                                 if (error == EHOSTUNREACH) {
 8248                                                         /*
 8249                                                          * Destination went
 8250                                                          * unreachable
 8251                                                          * during this send
 8252                                                          */
 8253                                                         sctp_move_chunks_from_net(stcb, net);
 8254                                                 }
 8255                                                 *reason_code = 7;
 8256                                                 break;
 8257                                         } else {
 8258                                                 asoc->ifp_had_enobuf = 0;
 8259                                         }
 8260                                         /*
 8261                                          * increase the number we sent, if a
 8262                                          * cookie is sent we don't tell them
 8263                                          * any was sent out.
 8264                                          */
 8265                                         outchain = endoutchain = NULL;
 8266                                         auth = NULL;
 8267                                         auth_offset = 0;
 8268                                         if (!no_out_cnt)
 8269                                                 *num_out += ctl_cnt;
 8270                                         /* recalc a clean slate and setup */
 8271                                         switch (net->ro._l_addr.sa.sa_family) {
 8272 #ifdef INET
 8273                                         case AF_INET:
 8274                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8275                                                 break;
 8276 #endif
 8277 #ifdef INET6
 8278                                         case AF_INET6:
 8279                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8280                                                 break;
 8281 #endif
 8282                                         default:
 8283                                                 /* TSNH */
 8284                                                 mtu = net->mtu;
 8285                                                 break;
 8286                                         }
 8287                                         to_out = 0;
 8288                                         no_fragmentflg = 1;
 8289                                 }
 8290                         }
 8291                 }
 8292                 if (error != 0) {
 8293                         /* try next net */
 8294                         continue;
 8295                 }
 8296                 /************************/
 8297                 /* Control transmission */
 8298                 /************************/
 8299                 /* Now first lets go through the control queue */
 8300                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 8301                         if ((sack_goes_to) &&
 8302                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
 8303                             (chk->whoTo != sack_goes_to)) {
 8304                                 /*
 8305                                  * if we have a sack in queue, and we are
 8306                                  * looking at an ecn echo that is NOT queued
 8307                                  * to where the sack is going..
 8308                                  */
 8309                                 if (chk->whoTo == net) {
 8310                                         /*
 8311                                          * Don't transmit it to where its
 8312                                          * going (current net)
 8313                                          */
 8314                                         continue;
 8315                                 } else if (sack_goes_to == net) {
 8316                                         /*
 8317                                          * But do transmit it to this
 8318                                          * address
 8319                                          */
 8320                                         goto skip_net_check;
 8321                                 }
 8322                         }
 8323                         if (chk->whoTo == NULL) {
 8324                                 if (asoc->alternate == NULL) {
 8325                                         if (asoc->primary_destination != net) {
 8326                                                 continue;
 8327                                         }
 8328                                 } else {
 8329                                         if (asoc->alternate != net) {
 8330                                                 continue;
 8331                                         }
 8332                                 }
 8333                         } else {
 8334                                 if (chk->whoTo != net) {
 8335                                         continue;
 8336                                 }
 8337                         }
 8338         skip_net_check:
 8339                         if (chk->data == NULL) {
 8340                                 continue;
 8341                         }
 8342                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 8343                                 /*
 8344                                  * It must be unsent. Cookies and ASCONF's
 8345                                  * hang around but there timers will force
 8346                                  * when marked for resend.
 8347                                  */
 8348                                 continue;
 8349                         }
 8350                         /*
 8351                          * if no AUTH is yet included and this chunk
 8352                          * requires it, make sure to account for it.  We
 8353                          * don't apply the size until the AUTH chunk is
 8354                          * actually added below in case there is no room for
 8355                          * this chunk. NOTE: we overload the use of "omtu"
 8356                          * here
 8357                          */
 8358                         if ((auth == NULL) &&
 8359                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8360                             stcb->asoc.peer_auth_chunks)) {
 8361                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8362                         } else
 8363                                 omtu = 0;
 8364                         /* Here we do NOT factor the r_mtu */
 8365                         if ((chk->send_size <= (int)(mtu - omtu)) ||
 8366                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8367                                 /*
 8368                                  * We probably should glom the mbuf chain
 8369                                  * from the chk->data for control but the
 8370                                  * problem is it becomes yet one more level
 8371                                  * of tracking to do if for some reason
 8372                                  * output fails. Then I have got to
 8373                                  * reconstruct the merged control chain.. el
 8374                                  * yucko.. for now we take the easy way and
 8375                                  * do the copy
 8376                                  */
 8377                                 /*
 8378                                  * Add an AUTH chunk, if chunk requires it
 8379                                  * save the offset into the chain for AUTH
 8380                                  */
 8381                                 if ((auth == NULL) &&
 8382                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8383                                     stcb->asoc.peer_auth_chunks))) {
 8384                                         outchain = sctp_add_auth_chunk(outchain,
 8385                                             &endoutchain,
 8386                                             &auth,
 8387                                             &auth_offset,
 8388                                             stcb,
 8389                                             chk->rec.chunk_id.id);
 8390                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8391                                 }
 8392                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8393                                     (int)chk->rec.chunk_id.can_take_data,
 8394                                     chk->send_size, chk->copy_by_ref);
 8395                                 if (outchain == NULL) {
 8396                                         *reason_code = 8;
 8397                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8398                                         return (ENOMEM);
 8399                                 }
 8400                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8401                                 /* update our MTU size */
 8402                                 if (mtu > (chk->send_size + omtu))
 8403                                         mtu -= (chk->send_size + omtu);
 8404                                 else
 8405                                         mtu = 0;
 8406                                 to_out += (chk->send_size + omtu);
 8407                                 /* Do clear IP_DF ? */
 8408                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8409                                         no_fragmentflg = 0;
 8410                                 }
 8411                                 if (chk->rec.chunk_id.can_take_data)
 8412                                         chk->data = NULL;
 8413                                 /* Mark things to be removed, if needed */
 8414                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8415                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 8416                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 8417                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 8418                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 8419                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 8420                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 8421                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 8422                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 8423                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 8424                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 8425                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 8426                                                 hbflag = 1;
 8427                                         }
 8428                                         /* remove these chunks at the end */
 8429                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8430                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 8431                                                 /* turn off the timer */
 8432                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 8433                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 8434                                                             inp, stcb, net,
 8435                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 8436                                                 }
 8437                                         }
 8438                                         ctl_cnt++;
 8439                                 } else {
 8440                                         /*
 8441                                          * Other chunks, since they have
 8442                                          * timers running (i.e. COOKIE) we
 8443                                          * just "trust" that it gets sent or
 8444                                          * retransmitted.
 8445                                          */
 8446                                         ctl_cnt++;
 8447                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8448                                                 cookie = 1;
 8449                                                 no_out_cnt = 1;
 8450                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 8451                                                 /*
 8452                                                  * Increment ecne send count
 8453                                                  * here this means we may be
 8454                                                  * over-zealous in our
 8455                                                  * counting if the send
 8456                                                  * fails, but its the best
 8457                                                  * place to do it (we used
 8458                                                  * to do it in the queue of
 8459                                                  * the chunk, but that did
 8460                                                  * not tell how many times
 8461                                                  * it was sent.
 8462                                                  */
 8463                                                 SCTP_STAT_INCR(sctps_sendecne);
 8464                                         }
 8465                                         chk->sent = SCTP_DATAGRAM_SENT;
 8466                                         if (chk->whoTo == NULL) {
 8467                                                 chk->whoTo = net;
 8468                                                 atomic_add_int(&net->ref_count, 1);
 8469                                         }
 8470                                         chk->snd_count++;
 8471                                 }
 8472                                 if (mtu == 0) {
 8473                                         /*
 8474                                          * Ok we are out of room but we can
 8475                                          * output without effecting the
 8476                                          * flight size since this little guy
 8477                                          * is a control only packet.
 8478                                          */
 8479                                         if (asconf) {
 8480                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8481                                                 /*
 8482                                                  * do NOT clear the asconf
 8483                                                  * flag as it is used to do
 8484                                                  * appropriate source
 8485                                                  * address selection.
 8486                                                  */
 8487                                         }
 8488                                         if (cookie) {
 8489                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8490                                                 cookie = 0;
 8491                                         }
 8492                                         /* Only HB or ASCONF advances time */
 8493                                         if (hbflag) {
 8494                                                 if (*now_filled == 0) {
 8495                                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8496                                                         *now_filled = 1;
 8497                                                 }
 8498                                                 net->last_sent_time = *now;
 8499                                                 hbflag = 0;
 8500                                         }
 8501                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8502                                             (struct sockaddr *)&net->ro._l_addr,
 8503                                             outchain,
 8504                                             auth_offset, auth,
 8505                                             stcb->asoc.authinfo.active_keyid,
 8506                                             no_fragmentflg, 0, asconf,
 8507                                             inp->sctp_lport, stcb->rport,
 8508                                             htonl(stcb->asoc.peer_vtag),
 8509                                             net->port, NULL,
 8510                                             0, 0,
 8511                                             so_locked))) {
 8512                                                 /*
 8513                                                  * error, we could not
 8514                                                  * output
 8515                                                  */
 8516                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8517                                                 if (from_where == 0) {
 8518                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8519                                                 }
 8520                                                 if (error == ENOBUFS) {
 8521                                                         asoc->ifp_had_enobuf = 1;
 8522                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8523                                                 }
 8524                                                 if (error == EHOSTUNREACH) {
 8525                                                         /*
 8526                                                          * Destination went
 8527                                                          * unreachable
 8528                                                          * during this send
 8529                                                          */
 8530                                                         sctp_move_chunks_from_net(stcb, net);
 8531                                                 }
 8532                                                 *reason_code = 7;
 8533                                                 break;
 8534                                         } else {
 8535                                                 asoc->ifp_had_enobuf = 0;
 8536                                         }
 8537                                         /*
 8538                                          * increase the number we sent, if a
 8539                                          * cookie is sent we don't tell them
 8540                                          * any was sent out.
 8541                                          */
 8542                                         outchain = endoutchain = NULL;
 8543                                         auth = NULL;
 8544                                         auth_offset = 0;
 8545                                         if (!no_out_cnt)
 8546                                                 *num_out += ctl_cnt;
 8547                                         /* recalc a clean slate and setup */
 8548                                         switch (net->ro._l_addr.sa.sa_family) {
 8549 #ifdef INET
 8550                                         case AF_INET:
 8551                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8552                                                 break;
 8553 #endif
 8554 #ifdef INET6
 8555                                         case AF_INET6:
 8556                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8557                                                 break;
 8558 #endif
 8559                                         default:
 8560                                                 /* TSNH */
 8561                                                 mtu = net->mtu;
 8562                                                 break;
 8563                                         }
 8564                                         to_out = 0;
 8565                                         no_fragmentflg = 1;
 8566                                 }
 8567                         }
 8568                 }
 8569                 if (error != 0) {
 8570                         /* try next net */
 8571                         continue;
 8572                 }
 8573                 /* JRI: if dest is in PF state, do not send data to it */
 8574                 if ((asoc->sctp_cmt_on_off > 0) &&
 8575                     (net != stcb->asoc.alternate) &&
 8576                     (net->dest_state & SCTP_ADDR_PF)) {
 8577                         goto no_data_fill;
 8578                 }
 8579                 if (net->flight_size >= net->cwnd) {
 8580                         goto no_data_fill;
 8581                 }
 8582                 if ((asoc->sctp_cmt_on_off > 0) &&
 8583                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
 8584                     (net->flight_size > max_rwnd_per_dest)) {
 8585                         goto no_data_fill;
 8586                 }
 8587                 /*
 8588                  * We need a specific accounting for the usage of the send
 8589                  * buffer. We also need to check the number of messages per
 8590                  * net. For now, this is better than nothing and it disabled
 8591                  * by default...
 8592                  */
 8593                 if ((asoc->sctp_cmt_on_off > 0) &&
 8594                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
 8595                     (max_send_per_dest > 0) &&
 8596                     (net->flight_size > max_send_per_dest)) {
 8597                         goto no_data_fill;
 8598                 }
 8599                 /*********************/
 8600                 /* Data transmission */
 8601                 /*********************/
 8602                 /*
 8603                  * if AUTH for DATA is required and no AUTH has been added
 8604                  * yet, account for this in the mtu now... if no data can be
 8605                  * bundled, this adjustment won't matter anyways since the
 8606                  * packet will be going out...
 8607                  */
 8608                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
 8609                     stcb->asoc.peer_auth_chunks);
 8610                 if (data_auth_reqd && (auth == NULL)) {
 8611                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8612                 }
 8613                 /* now lets add any data within the MTU constraints */
 8614                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8615 #ifdef INET
 8616                 case AF_INET:
 8617                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
 8618                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8619                         else
 8620                                 omtu = 0;
 8621                         break;
 8622 #endif
 8623 #ifdef INET6
 8624                 case AF_INET6:
 8625                         if (net->mtu > SCTP_MIN_OVERHEAD)
 8626                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
 8627                         else
 8628                                 omtu = 0;
 8629                         break;
 8630 #endif
 8631                 default:
 8632                         /* TSNH */
 8633                         omtu = 0;
 8634                         break;
 8635                 }
 8636                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 8637                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 8638                     (skip_data_for_this_net == 0)) ||
 8639                     (cookie)) {
 8640                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 8641                                 if (no_data_chunks) {
 8642                                         /* let only control go out */
 8643                                         *reason_code = 1;
 8644                                         break;
 8645                                 }
 8646                                 if (net->flight_size >= net->cwnd) {
 8647                                         /* skip this net, no room for data */
 8648                                         *reason_code = 2;
 8649                                         break;
 8650                                 }
 8651                                 if ((chk->whoTo != NULL) &&
 8652                                     (chk->whoTo != net)) {
 8653                                         /* Don't send the chunk on this net */
 8654                                         continue;
 8655                                 }
 8656                                 if (asoc->sctp_cmt_on_off == 0) {
 8657                                         if ((asoc->alternate) &&
 8658                                             (asoc->alternate != net) &&
 8659                                             (chk->whoTo == NULL)) {
 8660                                                 continue;
 8661                                         } else if ((net != asoc->primary_destination) &&
 8662                                                     (asoc->alternate == NULL) &&
 8663                                             (chk->whoTo == NULL)) {
 8664                                                 continue;
 8665                                         }
 8666                                 }
 8667                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 8668                                         /*-
 8669                                          * strange, we have a chunk that is
 8670                                          * to big for its destination and
 8671                                          * yet no fragment ok flag.
 8672                                          * Something went wrong when the
 8673                                          * PMTU changed...we did not mark
 8674                                          * this chunk for some reason?? I
 8675                                          * will fix it here by letting IP
 8676                                          * fragment it for now and printing
 8677                                          * a warning. This really should not
 8678                                          * happen ...
 8679                                          */
 8680                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 8681                                             chk->send_size, mtu);
 8682                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 8683                                 }
 8684                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 8685                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
 8686                                         struct sctp_data_chunk *dchkh;
 8687 
 8688                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 8689                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 8690                                 }
 8691                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 8692                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 8693                                         /* ok we will add this one */
 8694 
 8695                                         /*
 8696                                          * Add an AUTH chunk, if chunk
 8697                                          * requires it, save the offset into
 8698                                          * the chain for AUTH
 8699                                          */
 8700                                         if (data_auth_reqd) {
 8701                                                 if (auth == NULL) {
 8702                                                         outchain = sctp_add_auth_chunk(outchain,
 8703                                                             &endoutchain,
 8704                                                             &auth,
 8705                                                             &auth_offset,
 8706                                                             stcb,
 8707                                                             SCTP_DATA);
 8708                                                         auth_keyid = chk->auth_keyid;
 8709                                                         override_ok = 0;
 8710                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8711                                                 } else if (override_ok) {
 8712                                                         /*
 8713                                                          * use this data's
 8714                                                          * keyid
 8715                                                          */
 8716                                                         auth_keyid = chk->auth_keyid;
 8717                                                         override_ok = 0;
 8718                                                 } else if (auth_keyid != chk->auth_keyid) {
 8719                                                         /*
 8720                                                          * different keyid,
 8721                                                          * so done bundling
 8722                                                          */
 8723                                                         break;
 8724                                                 }
 8725                                         }
 8726                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 8727                                             chk->send_size, chk->copy_by_ref);
 8728                                         if (outchain == NULL) {
 8729                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 8730                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8731                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8732                                                 }
 8733                                                 *reason_code = 3;
 8734                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8735                                                 return (ENOMEM);
 8736                                         }
 8737                                         /* upate our MTU size */
 8738                                         /* Do clear IP_DF ? */
 8739                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8740                                                 no_fragmentflg = 0;
 8741                                         }
 8742                                         /* unsigned subtraction of mtu */
 8743                                         if (mtu > chk->send_size)
 8744                                                 mtu -= chk->send_size;
 8745                                         else
 8746                                                 mtu = 0;
 8747                                         /* unsigned subtraction of r_mtu */
 8748                                         if (r_mtu > chk->send_size)
 8749                                                 r_mtu -= chk->send_size;
 8750                                         else
 8751                                                 r_mtu = 0;
 8752 
 8753                                         to_out += chk->send_size;
 8754                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 8755 #ifdef INVARIANTS
 8756                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
 8757 #else
 8758                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
 8759                                                     mx_mtu, to_out);
 8760 #endif
 8761                                         }
 8762                                         chk->window_probe = 0;
 8763                                         data_list[bundle_at++] = chk;
 8764                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 8765                                                 break;
 8766                                         }
 8767                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
 8768                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 8769                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
 8770                                                 } else {
 8771                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
 8772                                                 }
 8773                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
 8774                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
 8775                                                         /*
 8776                                                          * Count number of
 8777                                                          * user msg's that
 8778                                                          * were fragmented
 8779                                                          * we do this by
 8780                                                          * counting when we
 8781                                                          * see a LAST
 8782                                                          * fragment only.
 8783                                                          */
 8784                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
 8785                                         }
 8786                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
 8787                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
 8788                                                         data_list[0]->window_probe = 1;
 8789                                                         net->window_probe = 1;
 8790                                                 }
 8791                                                 break;
 8792                                         }
 8793                                 } else {
 8794                                         /*
 8795                                          * Must be sent in order of the
 8796                                          * TSN's (on a network)
 8797                                          */
 8798                                         break;
 8799                                 }
 8800                         }       /* for (chunk gather loop for this net) */
 8801                 }               /* if asoc.state OPEN */
 8802 no_data_fill:
 8803                 /* Is there something to send for this destination? */
 8804                 if (outchain) {
 8805                         /* We may need to start a control timer or two */
 8806                         if (asconf) {
 8807                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
 8808                                     stcb, net);
 8809                                 /*
 8810                                  * do NOT clear the asconf flag as it is
 8811                                  * used to do appropriate source address
 8812                                  * selection.
 8813                                  */
 8814                         }
 8815                         if (cookie) {
 8816                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8817                                 cookie = 0;
 8818                         }
 8819                         /* must start a send timer if data is being sent */
 8820                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 8821                                 /*
 8822                                  * no timer running on this destination
 8823                                  * restart it.
 8824                                  */
 8825                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8826                         }
 8827                         if (bundle_at || hbflag) {
 8828                                 /* For data/asconf and hb set time */
 8829                                 if (*now_filled == 0) {
 8830                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8831                                         *now_filled = 1;
 8832                                 }
 8833                                 net->last_sent_time = *now;
 8834                         }
 8835                         /* Now send it, if there is anything to send :> */
 8836                         if ((error = sctp_lowlevel_chunk_output(inp,
 8837                             stcb,
 8838                             net,
 8839                             (struct sockaddr *)&net->ro._l_addr,
 8840                             outchain,
 8841                             auth_offset,
 8842                             auth,
 8843                             auth_keyid,
 8844                             no_fragmentflg,
 8845                             bundle_at,
 8846                             asconf,
 8847                             inp->sctp_lport, stcb->rport,
 8848                             htonl(stcb->asoc.peer_vtag),
 8849                             net->port, NULL,
 8850                             0, 0,
 8851                             so_locked))) {
 8852                                 /* error, we could not output */
 8853                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8854                                 if (from_where == 0) {
 8855                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8856                                 }
 8857                                 if (error == ENOBUFS) {
 8858                                         asoc->ifp_had_enobuf = 1;
 8859                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8860                                 }
 8861                                 if (error == EHOSTUNREACH) {
 8862                                         /*
 8863                                          * Destination went unreachable
 8864                                          * during this send
 8865                                          */
 8866                                         sctp_move_chunks_from_net(stcb, net);
 8867                                 }
 8868                                 *reason_code = 6;
 8869                                 /*-
 8870                                  * I add this line to be paranoid. As far as
 8871                                  * I can tell the continue, takes us back to
 8872                                  * the top of the for, but just to make sure
 8873                                  * I will reset these again here.
 8874                                  */
 8875                                 ctl_cnt = bundle_at = 0;
 8876                                 continue;       /* This takes us back to the
 8877                                                  * for() for the nets. */
 8878                         } else {
 8879                                 asoc->ifp_had_enobuf = 0;
 8880                         }
 8881                         endoutchain = NULL;
 8882                         auth = NULL;
 8883                         auth_offset = 0;
 8884                         if (!no_out_cnt) {
 8885                                 *num_out += (ctl_cnt + bundle_at);
 8886                         }
 8887                         if (bundle_at) {
 8888                                 /* setup for a RTO measurement */
 8889                                 tsns_sent = data_list[0]->rec.data.tsn;
 8890                                 /* fill time if not already filled */
 8891                                 if (*now_filled == 0) {
 8892                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 8893                                         *now_filled = 1;
 8894                                         *now = asoc->time_last_sent;
 8895                                 } else {
 8896                                         asoc->time_last_sent = *now;
 8897                                 }
 8898                                 if (net->rto_needed) {
 8899                                         data_list[0]->do_rtt = 1;
 8900                                         net->rto_needed = 0;
 8901                                 }
 8902                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
 8903                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
 8904                         }
 8905                         if (one_chunk) {
 8906                                 break;
 8907                         }
 8908                 }
 8909                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8910                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
 8911                 }
 8912         }
 8913         if (old_start_at == NULL) {
 8914                 old_start_at = start_at;
 8915                 start_at = TAILQ_FIRST(&asoc->nets);
 8916                 if (old_start_at)
 8917                         goto again_one_more_time;
 8918         }
 8919         /*
 8920          * At the end there should be no NON timed chunks hanging on this
 8921          * queue.
 8922          */
 8923         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8924                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
 8925         }
 8926         if ((*num_out == 0) && (*reason_code == 0)) {
 8927                 *reason_code = 4;
 8928         } else {
 8929                 *reason_code = 5;
 8930         }
 8931         sctp_clean_up_ctl(stcb, asoc, so_locked);
 8932         return (0);
 8933 }
 8934 
 8935 void
 8936 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
 8937 {
 8938         /*-
 8939          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 8940          * the control chunk queue.
 8941          */
 8942         struct sctp_chunkhdr *hdr;
 8943         struct sctp_tmit_chunk *chk;
 8944         struct mbuf *mat, *last_mbuf;
 8945         uint32_t chunk_length;
 8946         uint16_t padding_length;
 8947 
 8948         SCTP_TCB_LOCK_ASSERT(stcb);
 8949         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
 8950         if (op_err == NULL) {
 8951                 return;
 8952         }
 8953         last_mbuf = NULL;
 8954         chunk_length = 0;
 8955         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
 8956                 chunk_length += SCTP_BUF_LEN(mat);
 8957                 if (SCTP_BUF_NEXT(mat) == NULL) {
 8958                         last_mbuf = mat;
 8959                 }
 8960         }
 8961         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
 8962                 sctp_m_freem(op_err);
 8963                 return;
 8964         }
 8965         padding_length = chunk_length % 4;
 8966         if (padding_length != 0) {
 8967                 padding_length = 4 - padding_length;
 8968         }
 8969         if (padding_length != 0) {
 8970                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
 8971                         sctp_m_freem(op_err);
 8972                         return;
 8973                 }
 8974         }
 8975         sctp_alloc_a_chunk(stcb, chk);
 8976         if (chk == NULL) {
 8977                 /* no memory */
 8978                 sctp_m_freem(op_err);
 8979                 return;
 8980         }
 8981         chk->copy_by_ref = 0;
 8982         chk->send_size = (uint16_t)chunk_length;
 8983         chk->sent = SCTP_DATAGRAM_UNSENT;
 8984         chk->snd_count = 0;
 8985         chk->asoc = &stcb->asoc;
 8986         chk->data = op_err;
 8987         chk->whoTo = NULL;
 8988         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
 8989         chk->rec.chunk_id.can_take_data = 0;
 8990         hdr = mtod(op_err, struct sctp_chunkhdr *);
 8991         hdr->chunk_type = SCTP_OPERATION_ERROR;
 8992         hdr->chunk_flags = 0;
 8993         hdr->chunk_length = htons(chk->send_size);
 8994         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8995         chk->asoc->ctrl_queue_cnt++;
 8996 }
 8997 
 8998 int
 8999 sctp_send_cookie_echo(struct mbuf *m,
 9000     int offset,
 9001     struct sctp_tcb *stcb,
 9002     struct sctp_nets *net)
 9003 {
 9004         /*-
 9005          * pull out the cookie and put it at the front of the control chunk
 9006          * queue.
 9007          */
 9008         int at;
 9009         struct mbuf *cookie;
 9010         struct sctp_paramhdr param, *phdr;
 9011         struct sctp_chunkhdr *hdr;
 9012         struct sctp_tmit_chunk *chk;
 9013         uint16_t ptype, plen;
 9014 
 9015         SCTP_TCB_LOCK_ASSERT(stcb);
 9016         /* First find the cookie in the param area */
 9017         cookie = NULL;
 9018         at = offset + sizeof(struct sctp_init_chunk);
 9019         for (;;) {
 9020                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
 9021                 if (phdr == NULL) {
 9022                         return (-3);
 9023                 }
 9024                 ptype = ntohs(phdr->param_type);
 9025                 plen = ntohs(phdr->param_length);
 9026                 if (ptype == SCTP_STATE_COOKIE) {
 9027                         int pad;
 9028 
 9029                         /* found the cookie */
 9030                         if ((pad = (plen % 4))) {
 9031                                 plen += 4 - pad;
 9032                         }
 9033                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
 9034                         if (cookie == NULL) {
 9035                                 /* No memory */
 9036                                 return (-2);
 9037                         }
 9038 #ifdef SCTP_MBUF_LOGGING
 9039                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9040                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
 9041                         }
 9042 #endif
 9043                         break;
 9044                 }
 9045                 at += SCTP_SIZE32(plen);
 9046         }
 9047         /* ok, we got the cookie lets change it into a cookie echo chunk */
 9048         /* first the change from param to cookie */
 9049         hdr = mtod(cookie, struct sctp_chunkhdr *);
 9050         hdr->chunk_type = SCTP_COOKIE_ECHO;
 9051         hdr->chunk_flags = 0;
 9052         /* get the chunk stuff now and place it in the FRONT of the queue */
 9053         sctp_alloc_a_chunk(stcb, chk);
 9054         if (chk == NULL) {
 9055                 /* no memory */
 9056                 sctp_m_freem(cookie);
 9057                 return (-5);
 9058         }
 9059         chk->copy_by_ref = 0;
 9060         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
 9061         chk->rec.chunk_id.can_take_data = 0;
 9062         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9063         chk->send_size = plen;
 9064         chk->sent = SCTP_DATAGRAM_UNSENT;
 9065         chk->snd_count = 0;
 9066         chk->asoc = &stcb->asoc;
 9067         chk->data = cookie;
 9068         chk->whoTo = net;
 9069         atomic_add_int(&chk->whoTo->ref_count, 1);
 9070         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
 9071         chk->asoc->ctrl_queue_cnt++;
 9072         return (0);
 9073 }
 9074 
 9075 void
 9076 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
 9077     struct mbuf *m,
 9078     int offset,
 9079     int chk_length,
 9080     struct sctp_nets *net)
 9081 {
 9082         /*
 9083          * take a HB request and make it into a HB ack and send it.
 9084          */
 9085         struct mbuf *outchain;
 9086         struct sctp_chunkhdr *chdr;
 9087         struct sctp_tmit_chunk *chk;
 9088 
 9089 
 9090         if (net == NULL)
 9091                 /* must have a net pointer */
 9092                 return;
 9093 
 9094         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
 9095         if (outchain == NULL) {
 9096                 /* gak out of memory */
 9097                 return;
 9098         }
 9099 #ifdef SCTP_MBUF_LOGGING
 9100         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9101                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
 9102         }
 9103 #endif
 9104         chdr = mtod(outchain, struct sctp_chunkhdr *);
 9105         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
 9106         chdr->chunk_flags = 0;
 9107         if (chk_length % 4) {
 9108                 /* need pad */
 9109                 uint32_t cpthis = 0;
 9110                 int padlen;
 9111 
 9112                 padlen = 4 - (chk_length % 4);
 9113                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
 9114         }
 9115         sctp_alloc_a_chunk(stcb, chk);
 9116         if (chk == NULL) {
 9117                 /* no memory */
 9118                 sctp_m_freem(outchain);
 9119                 return;
 9120         }
 9121         chk->copy_by_ref = 0;
 9122         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
 9123         chk->rec.chunk_id.can_take_data = 1;
 9124         chk->flags = 0;
 9125         chk->send_size = chk_length;
 9126         chk->sent = SCTP_DATAGRAM_UNSENT;
 9127         chk->snd_count = 0;
 9128         chk->asoc = &stcb->asoc;
 9129         chk->data = outchain;
 9130         chk->whoTo = net;
 9131         atomic_add_int(&chk->whoTo->ref_count, 1);
 9132         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9133         chk->asoc->ctrl_queue_cnt++;
 9134 }
 9135 
 9136 void
 9137 sctp_send_cookie_ack(struct sctp_tcb *stcb)
 9138 {
 9139         /* formulate and queue a cookie-ack back to sender */
 9140         struct mbuf *cookie_ack;
 9141         struct sctp_chunkhdr *hdr;
 9142         struct sctp_tmit_chunk *chk;
 9143 
 9144         SCTP_TCB_LOCK_ASSERT(stcb);
 9145 
 9146         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
 9147         if (cookie_ack == NULL) {
 9148                 /* no mbuf's */
 9149                 return;
 9150         }
 9151         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
 9152         sctp_alloc_a_chunk(stcb, chk);
 9153         if (chk == NULL) {
 9154                 /* no memory */
 9155                 sctp_m_freem(cookie_ack);
 9156                 return;
 9157         }
 9158         chk->copy_by_ref = 0;
 9159         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
 9160         chk->rec.chunk_id.can_take_data = 1;
 9161         chk->flags = 0;
 9162         chk->send_size = sizeof(struct sctp_chunkhdr);
 9163         chk->sent = SCTP_DATAGRAM_UNSENT;
 9164         chk->snd_count = 0;
 9165         chk->asoc = &stcb->asoc;
 9166         chk->data = cookie_ack;
 9167         if (chk->asoc->last_control_chunk_from != NULL) {
 9168                 chk->whoTo = chk->asoc->last_control_chunk_from;
 9169                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9170         } else {
 9171                 chk->whoTo = NULL;
 9172         }
 9173         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
 9174         hdr->chunk_type = SCTP_COOKIE_ACK;
 9175         hdr->chunk_flags = 0;
 9176         hdr->chunk_length = htons(chk->send_size);
 9177         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
 9178         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9179         chk->asoc->ctrl_queue_cnt++;
 9180         return;
 9181 }
 9182 
 9183 
 9184 void
 9185 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
 9186 {
 9187         /* formulate and queue a SHUTDOWN-ACK back to the sender */
 9188         struct mbuf *m_shutdown_ack;
 9189         struct sctp_shutdown_ack_chunk *ack_cp;
 9190         struct sctp_tmit_chunk *chk;
 9191 
 9192         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9193         if (m_shutdown_ack == NULL) {
 9194                 /* no mbuf's */
 9195                 return;
 9196         }
 9197         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
 9198         sctp_alloc_a_chunk(stcb, chk);
 9199         if (chk == NULL) {
 9200                 /* no memory */
 9201                 sctp_m_freem(m_shutdown_ack);
 9202                 return;
 9203         }
 9204         chk->copy_by_ref = 0;
 9205         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
 9206         chk->rec.chunk_id.can_take_data = 1;
 9207         chk->flags = 0;
 9208         chk->send_size = sizeof(struct sctp_chunkhdr);
 9209         chk->sent = SCTP_DATAGRAM_UNSENT;
 9210         chk->snd_count = 0;
 9211         chk->flags = 0;
 9212         chk->asoc = &stcb->asoc;
 9213         chk->data = m_shutdown_ack;
 9214         chk->whoTo = net;
 9215         if (chk->whoTo) {
 9216                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9217         }
 9218         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
 9219         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
 9220         ack_cp->ch.chunk_flags = 0;
 9221         ack_cp->ch.chunk_length = htons(chk->send_size);
 9222         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
 9223         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9224         chk->asoc->ctrl_queue_cnt++;
 9225         return;
 9226 }
 9227 
 9228 void
 9229 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
 9230 {
 9231         /* formulate and queue a SHUTDOWN to the sender */
 9232         struct mbuf *m_shutdown;
 9233         struct sctp_shutdown_chunk *shutdown_cp;
 9234         struct sctp_tmit_chunk *chk;
 9235 
 9236         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 9237                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
 9238                         /* We already have a SHUTDOWN queued. Reuse it. */
 9239                         if (chk->whoTo) {
 9240                                 sctp_free_remote_addr(chk->whoTo);
 9241                                 chk->whoTo = NULL;
 9242                         }
 9243                         break;
 9244                 }
 9245         }
 9246         if (chk == NULL) {
 9247                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9248                 if (m_shutdown == NULL) {
 9249                         /* no mbuf's */
 9250                         return;
 9251                 }
 9252                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
 9253                 sctp_alloc_a_chunk(stcb, chk);
 9254                 if (chk == NULL) {
 9255                         /* no memory */
 9256                         sctp_m_freem(m_shutdown);
 9257                         return;
 9258                 }
 9259                 chk->copy_by_ref = 0;
 9260                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
 9261                 chk->rec.chunk_id.can_take_data = 1;
 9262                 chk->flags = 0;
 9263                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
 9264                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9265                 chk->snd_count = 0;
 9266                 chk->flags = 0;
 9267                 chk->asoc = &stcb->asoc;
 9268                 chk->data = m_shutdown;
 9269                 chk->whoTo = net;
 9270                 if (chk->whoTo) {
 9271                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9272                 }
 9273                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
 9274                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
 9275                 shutdown_cp->ch.chunk_flags = 0;
 9276                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
 9277                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9278                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
 9279                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9280                 chk->asoc->ctrl_queue_cnt++;
 9281         } else {
 9282                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
 9283                 chk->whoTo = net;
 9284                 if (chk->whoTo) {
 9285                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9286                 }
 9287                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
 9288                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9289                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
 9290         }
 9291         return;
 9292 }
 9293 
 9294 void
 9295 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
 9296 {
 9297         /*
 9298          * formulate and queue an ASCONF to the peer. ASCONF parameters
 9299          * should be queued on the assoc queue.
 9300          */
 9301         struct sctp_tmit_chunk *chk;
 9302         struct mbuf *m_asconf;
 9303         int len;
 9304 
 9305         SCTP_TCB_LOCK_ASSERT(stcb);
 9306 
 9307         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
 9308             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
 9309                 /* can't send a new one if there is one in flight already */
 9310                 return;
 9311         }
 9312         /* compose an ASCONF chunk, maximum length is PMTU */
 9313         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
 9314         if (m_asconf == NULL) {
 9315                 return;
 9316         }
 9317         sctp_alloc_a_chunk(stcb, chk);
 9318         if (chk == NULL) {
 9319                 /* no memory */
 9320                 sctp_m_freem(m_asconf);
 9321                 return;
 9322         }
 9323         chk->copy_by_ref = 0;
 9324         chk->rec.chunk_id.id = SCTP_ASCONF;
 9325         chk->rec.chunk_id.can_take_data = 0;
 9326         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9327         chk->data = m_asconf;
 9328         chk->send_size = len;
 9329         chk->sent = SCTP_DATAGRAM_UNSENT;
 9330         chk->snd_count = 0;
 9331         chk->asoc = &stcb->asoc;
 9332         chk->whoTo = net;
 9333         if (chk->whoTo) {
 9334                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9335         }
 9336         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
 9337         chk->asoc->ctrl_queue_cnt++;
 9338         return;
 9339 }
 9340 
 9341 void
 9342 sctp_send_asconf_ack(struct sctp_tcb *stcb)
 9343 {
 9344         /*
 9345          * formulate and queue a asconf-ack back to sender. the asconf-ack
 9346          * must be stored in the tcb.
 9347          */
 9348         struct sctp_tmit_chunk *chk;
 9349         struct sctp_asconf_ack *ack, *latest_ack;
 9350         struct mbuf *m_ack;
 9351         struct sctp_nets *net = NULL;
 9352 
 9353         SCTP_TCB_LOCK_ASSERT(stcb);
 9354         /* Get the latest ASCONF-ACK */
 9355         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
 9356         if (latest_ack == NULL) {
 9357                 return;
 9358         }
 9359         if (latest_ack->last_sent_to != NULL &&
 9360             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
 9361                 /* we're doing a retransmission */
 9362                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
 9363                 if (net == NULL) {
 9364                         /* no alternate */
 9365                         if (stcb->asoc.last_control_chunk_from == NULL) {
 9366                                 if (stcb->asoc.alternate) {
 9367                                         net = stcb->asoc.alternate;
 9368                                 } else {
 9369                                         net = stcb->asoc.primary_destination;
 9370                                 }
 9371                         } else {
 9372                                 net = stcb->asoc.last_control_chunk_from;
 9373                         }
 9374                 }
 9375         } else {
 9376                 /* normal case */
 9377                 if (stcb->asoc.last_control_chunk_from == NULL) {
 9378                         if (stcb->asoc.alternate) {
 9379                                 net = stcb->asoc.alternate;
 9380                         } else {
 9381                                 net = stcb->asoc.primary_destination;
 9382                         }
 9383                 } else {
 9384                         net = stcb->asoc.last_control_chunk_from;
 9385                 }
 9386         }
 9387         latest_ack->last_sent_to = net;
 9388 
 9389         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
 9390                 if (ack->data == NULL) {
 9391                         continue;
 9392                 }
 9393                 /* copy the asconf_ack */
 9394                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
 9395                 if (m_ack == NULL) {
 9396                         /* couldn't copy it */
 9397                         return;
 9398                 }
 9399 #ifdef SCTP_MBUF_LOGGING
 9400                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9401                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
 9402                 }
 9403 #endif
 9404 
 9405                 sctp_alloc_a_chunk(stcb, chk);
 9406                 if (chk == NULL) {
 9407                         /* no memory */
 9408                         if (m_ack)
 9409                                 sctp_m_freem(m_ack);
 9410                         return;
 9411                 }
 9412                 chk->copy_by_ref = 0;
 9413                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
 9414                 chk->rec.chunk_id.can_take_data = 1;
 9415                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9416                 chk->whoTo = net;
 9417                 if (chk->whoTo) {
 9418                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9419                 }
 9420                 chk->data = m_ack;
 9421                 chk->send_size = ack->len;
 9422                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9423                 chk->snd_count = 0;
 9424                 chk->asoc = &stcb->asoc;
 9425 
 9426                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9427                 chk->asoc->ctrl_queue_cnt++;
 9428         }
 9429         return;
 9430 }
 9431 
 9432 
 9433 static int
 9434 sctp_chunk_retransmission(struct sctp_inpcb *inp,
 9435     struct sctp_tcb *stcb,
 9436     struct sctp_association *asoc,
 9437     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
 9438 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9439     SCTP_UNUSED
 9440 #endif
 9441 )
 9442 {
 9443         /*-
 9444          * send out one MTU of retransmission. If fast_retransmit is
 9445          * happening we ignore the cwnd. Otherwise we obey the cwnd and
 9446          * rwnd. For a Cookie or Asconf in the control chunk queue we
 9447          * retransmit them by themselves.
 9448          *
 9449          * For data chunks we will pick out the lowest TSN's in the sent_queue
 9450          * marked for resend and bundle them all together (up to a MTU of
 9451          * destination). The address to send to should have been
 9452          * selected/changed where the retransmission was marked (i.e. in FR
 9453          * or t3-timeout routines).
 9454          */
 9455         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 9456         struct sctp_tmit_chunk *chk, *fwd;
 9457         struct mbuf *m, *endofchain;
 9458         struct sctp_nets *net = NULL;
 9459         uint32_t tsns_sent = 0;
 9460         int no_fragmentflg, bundle_at, cnt_thru;
 9461         unsigned int mtu;
 9462         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
 9463         struct sctp_auth_chunk *auth = NULL;
 9464         uint32_t auth_offset = 0;
 9465         uint16_t auth_keyid;
 9466         int override_ok = 1;
 9467         int data_auth_reqd = 0;
 9468         uint32_t dmtu = 0;
 9469 
 9470         SCTP_TCB_LOCK_ASSERT(stcb);
 9471         tmr_started = ctl_cnt = bundle_at = error = 0;
 9472         no_fragmentflg = 1;
 9473         fwd_tsn = 0;
 9474         *cnt_out = 0;
 9475         fwd = NULL;
 9476         endofchain = m = NULL;
 9477         auth_keyid = stcb->asoc.authinfo.active_keyid;
 9478 #ifdef SCTP_AUDITING_ENABLED
 9479         sctp_audit_log(0xC3, 1);
 9480 #endif
 9481         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
 9482             (TAILQ_EMPTY(&asoc->control_send_queue))) {
 9483                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
 9484                     asoc->sent_queue_retran_cnt);
 9485                 asoc->sent_queue_cnt = 0;
 9486                 asoc->sent_queue_cnt_removeable = 0;
 9487                 /* send back 0/0 so we enter normal transmission */
 9488                 *cnt_out = 0;
 9489                 return (0);
 9490         }
 9491         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9492                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
 9493                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
 9494                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
 9495                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9496                                 continue;
 9497                         }
 9498                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 9499                                 if (chk != asoc->str_reset) {
 9500                                         /*
 9501                                          * not eligible for retran if its
 9502                                          * not ours
 9503                                          */
 9504                                         continue;
 9505                                 }
 9506                         }
 9507                         ctl_cnt++;
 9508                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 9509                                 fwd_tsn = 1;
 9510                         }
 9511                         /*
 9512                          * Add an AUTH chunk, if chunk requires it save the
 9513                          * offset into the chain for AUTH
 9514                          */
 9515                         if ((auth == NULL) &&
 9516                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9517                             stcb->asoc.peer_auth_chunks))) {
 9518                                 m = sctp_add_auth_chunk(m, &endofchain,
 9519                                     &auth, &auth_offset,
 9520                                     stcb,
 9521                                     chk->rec.chunk_id.id);
 9522                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9523                         }
 9524                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9525                         break;
 9526                 }
 9527         }
 9528         one_chunk = 0;
 9529         cnt_thru = 0;
 9530         /* do we have control chunks to retransmit? */
 9531         if (m != NULL) {
 9532                 /* Start a timer no matter if we succeed or fail */
 9533                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 9534                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
 9535                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
 9536                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
 9537                 chk->snd_count++;       /* update our count */
 9538                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
 9539                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
 9540                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9541                     no_fragmentflg, 0, 0,
 9542                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9543                     chk->whoTo->port, NULL,
 9544                     0, 0,
 9545                     so_locked))) {
 9546                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9547                         if (error == ENOBUFS) {
 9548                                 asoc->ifp_had_enobuf = 1;
 9549                                 SCTP_STAT_INCR(sctps_lowlevelerr);
 9550                         }
 9551                         return (error);
 9552                 } else {
 9553                         asoc->ifp_had_enobuf = 0;
 9554                 }
 9555                 endofchain = NULL;
 9556                 auth = NULL;
 9557                 auth_offset = 0;
 9558                 /*
 9559                  * We don't want to mark the net->sent time here since this
 9560                  * we use this for HB and retrans cannot measure RTT
 9561                  */
 9562                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
 9563                 *cnt_out += 1;
 9564                 chk->sent = SCTP_DATAGRAM_SENT;
 9565                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
 9566                 if (fwd_tsn == 0) {
 9567                         return (0);
 9568                 } else {
 9569                         /* Clean up the fwd-tsn list */
 9570                         sctp_clean_up_ctl(stcb, asoc, so_locked);
 9571                         return (0);
 9572                 }
 9573         }
 9574         /*
 9575          * Ok, it is just data retransmission we need to do or that and a
 9576          * fwd-tsn with it all.
 9577          */
 9578         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 9579                 return (SCTP_RETRAN_DONE);
 9580         }
 9581         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
 9582             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
 9583                 /* not yet open, resend the cookie and that is it */
 9584                 return (1);
 9585         }
 9586 #ifdef SCTP_AUDITING_ENABLED
 9587         sctp_auditing(20, inp, stcb, NULL);
 9588 #endif
 9589         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
 9590         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 9591                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9592                         /* No, not sent to this net or not ready for rtx */
 9593                         continue;
 9594                 }
 9595                 if (chk->data == NULL) {
 9596                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
 9597                             chk->rec.data.tsn, chk->snd_count, chk->sent);
 9598                         continue;
 9599                 }
 9600                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
 9601                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
 9602                         struct mbuf *op_err;
 9603                         char msg[SCTP_DIAG_INFO_LEN];
 9604 
 9605                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
 9606                             chk->rec.data.tsn, chk->snd_count);
 9607                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 9608                             msg);
 9609                         atomic_add_int(&stcb->asoc.refcnt, 1);
 9610                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
 9611                             so_locked);
 9612                         SCTP_TCB_LOCK(stcb);
 9613                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 9614                         return (SCTP_RETRAN_EXIT);
 9615                 }
 9616                 /* pick up the net */
 9617                 net = chk->whoTo;
 9618                 switch (net->ro._l_addr.sa.sa_family) {
 9619 #ifdef INET
 9620                 case AF_INET:
 9621                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 9622                         break;
 9623 #endif
 9624 #ifdef INET6
 9625                 case AF_INET6:
 9626                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9627                         break;
 9628 #endif
 9629                 default:
 9630                         /* TSNH */
 9631                         mtu = net->mtu;
 9632                         break;
 9633                 }
 9634 
 9635                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
 9636                         /* No room in peers rwnd */
 9637                         uint32_t tsn;
 9638 
 9639                         tsn = asoc->last_acked_seq + 1;
 9640                         if (tsn == chk->rec.data.tsn) {
 9641                                 /*
 9642                                  * we make a special exception for this
 9643                                  * case. The peer has no rwnd but is missing
 9644                                  * the lowest chunk.. which is probably what
 9645                                  * is holding up the rwnd.
 9646                                  */
 9647                                 goto one_chunk_around;
 9648                         }
 9649                         return (1);
 9650                 }
 9651 one_chunk_around:
 9652                 if (asoc->peers_rwnd < mtu) {
 9653                         one_chunk = 1;
 9654                         if ((asoc->peers_rwnd == 0) &&
 9655                             (asoc->total_flight == 0)) {
 9656                                 chk->window_probe = 1;
 9657                                 chk->whoTo->window_probe = 1;
 9658                         }
 9659                 }
 9660 #ifdef SCTP_AUDITING_ENABLED
 9661                 sctp_audit_log(0xC3, 2);
 9662 #endif
 9663                 bundle_at = 0;
 9664                 m = NULL;
 9665                 net->fast_retran_ip = 0;
 9666                 if (chk->rec.data.doing_fast_retransmit == 0) {
 9667                         /*
 9668                          * if no FR in progress skip destination that have
 9669                          * flight_size > cwnd.
 9670                          */
 9671                         if (net->flight_size >= net->cwnd) {
 9672                                 continue;
 9673                         }
 9674                 } else {
 9675                         /*
 9676                          * Mark the destination net to have FR recovery
 9677                          * limits put on it.
 9678                          */
 9679                         *fr_done = 1;
 9680                         net->fast_retran_ip = 1;
 9681                 }
 9682 
 9683                 /*
 9684                  * if no AUTH is yet included and this chunk requires it,
 9685                  * make sure to account for it.  We don't apply the size
 9686                  * until the AUTH chunk is actually added below in case
 9687                  * there is no room for this chunk.
 9688                  */
 9689                 if (data_auth_reqd && (auth == NULL)) {
 9690                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9691                 } else
 9692                         dmtu = 0;
 9693 
 9694                 if ((chk->send_size <= (mtu - dmtu)) ||
 9695                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9696                         /* ok we will add this one */
 9697                         if (data_auth_reqd) {
 9698                                 if (auth == NULL) {
 9699                                         m = sctp_add_auth_chunk(m,
 9700                                             &endofchain,
 9701                                             &auth,
 9702                                             &auth_offset,
 9703                                             stcb,
 9704                                             SCTP_DATA);
 9705                                         auth_keyid = chk->auth_keyid;
 9706                                         override_ok = 0;
 9707                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9708                                 } else if (override_ok) {
 9709                                         auth_keyid = chk->auth_keyid;
 9710                                         override_ok = 0;
 9711                                 } else if (chk->auth_keyid != auth_keyid) {
 9712                                         /* different keyid, so done bundling */
 9713                                         break;
 9714                                 }
 9715                         }
 9716                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9717                         if (m == NULL) {
 9718                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9719                                 return (ENOMEM);
 9720                         }
 9721                         /* Do clear IP_DF ? */
 9722                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9723                                 no_fragmentflg = 0;
 9724                         }
 9725                         /* upate our MTU size */
 9726                         if (mtu > (chk->send_size + dmtu))
 9727                                 mtu -= (chk->send_size + dmtu);
 9728                         else
 9729                                 mtu = 0;
 9730                         data_list[bundle_at++] = chk;
 9731                         if (one_chunk && (asoc->total_flight <= 0)) {
 9732                                 SCTP_STAT_INCR(sctps_windowprobed);
 9733                         }
 9734                 }
 9735                 if (one_chunk == 0) {
 9736                         /*
 9737                          * now are there anymore forward from chk to pick
 9738                          * up?
 9739                          */
 9740                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
 9741                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
 9742                                         /* Nope, not for retran */
 9743                                         continue;
 9744                                 }
 9745                                 if (fwd->whoTo != net) {
 9746                                         /* Nope, not the net in question */
 9747                                         continue;
 9748                                 }
 9749                                 if (data_auth_reqd && (auth == NULL)) {
 9750                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9751                                 } else
 9752                                         dmtu = 0;
 9753                                 if (fwd->send_size <= (mtu - dmtu)) {
 9754                                         if (data_auth_reqd) {
 9755                                                 if (auth == NULL) {
 9756                                                         m = sctp_add_auth_chunk(m,
 9757                                                             &endofchain,
 9758                                                             &auth,
 9759                                                             &auth_offset,
 9760                                                             stcb,
 9761                                                             SCTP_DATA);
 9762                                                         auth_keyid = fwd->auth_keyid;
 9763                                                         override_ok = 0;
 9764                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9765                                                 } else if (override_ok) {
 9766                                                         auth_keyid = fwd->auth_keyid;
 9767                                                         override_ok = 0;
 9768                                                 } else if (fwd->auth_keyid != auth_keyid) {
 9769                                                         /*
 9770                                                          * different keyid,
 9771                                                          * so done bundling
 9772                                                          */
 9773                                                         break;
 9774                                                 }
 9775                                         }
 9776                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
 9777                                         if (m == NULL) {
 9778                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9779                                                 return (ENOMEM);
 9780                                         }
 9781                                         /* Do clear IP_DF ? */
 9782                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9783                                                 no_fragmentflg = 0;
 9784                                         }
 9785                                         /* upate our MTU size */
 9786                                         if (mtu > (fwd->send_size + dmtu))
 9787                                                 mtu -= (fwd->send_size + dmtu);
 9788                                         else
 9789                                                 mtu = 0;
 9790                                         data_list[bundle_at++] = fwd;
 9791                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 9792                                                 break;
 9793                                         }
 9794                                 } else {
 9795                                         /* can't fit so we are done */
 9796                                         break;
 9797                                 }
 9798                         }
 9799                 }
 9800                 /* Is there something to send for this destination? */
 9801                 if (m) {
 9802                         /*
 9803                          * No matter if we fail/or succeed we should start a
 9804                          * timer. A failure is like a lost IP packet :-)
 9805                          */
 9806                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9807                                 /*
 9808                                  * no timer running on this destination
 9809                                  * restart it.
 9810                                  */
 9811                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9812                                 tmr_started = 1;
 9813                         }
 9814                         /* Now lets send it, if there is anything to send :> */
 9815                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9816                             (struct sockaddr *)&net->ro._l_addr, m,
 9817                             auth_offset, auth, auth_keyid,
 9818                             no_fragmentflg, 0, 0,
 9819                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9820                             net->port, NULL,
 9821                             0, 0,
 9822                             so_locked))) {
 9823                                 /* error, we could not output */
 9824                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9825                                 if (error == ENOBUFS) {
 9826                                         asoc->ifp_had_enobuf = 1;
 9827                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9828                                 }
 9829                                 return (error);
 9830                         } else {
 9831                                 asoc->ifp_had_enobuf = 0;
 9832                         }
 9833                         endofchain = NULL;
 9834                         auth = NULL;
 9835                         auth_offset = 0;
 9836                         /* For HB's */
 9837                         /*
 9838                          * We don't want to mark the net->sent time here
 9839                          * since this we use this for HB and retrans cannot
 9840                          * measure RTT
 9841                          */
 9842                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
 9843 
 9844                         /* For auto-close */
 9845                         cnt_thru++;
 9846                         if (*now_filled == 0) {
 9847                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 9848                                 *now = asoc->time_last_sent;
 9849                                 *now_filled = 1;
 9850                         } else {
 9851                                 asoc->time_last_sent = *now;
 9852                         }
 9853                         *cnt_out += bundle_at;
 9854 #ifdef SCTP_AUDITING_ENABLED
 9855                         sctp_audit_log(0xC4, bundle_at);
 9856 #endif
 9857                         if (bundle_at) {
 9858                                 tsns_sent = data_list[0]->rec.data.tsn;
 9859                         }
 9860                         for (i = 0; i < bundle_at; i++) {
 9861                                 SCTP_STAT_INCR(sctps_sendretransdata);
 9862                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 9863                                 /*
 9864                                  * When we have a revoked data, and we
 9865                                  * retransmit it, then we clear the revoked
 9866                                  * flag since this flag dictates if we
 9867                                  * subtracted from the fs
 9868                                  */
 9869                                 if (data_list[i]->rec.data.chunk_was_revoked) {
 9870                                         /* Deflate the cwnd */
 9871                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
 9872                                         data_list[i]->rec.data.chunk_was_revoked = 0;
 9873                                 }
 9874                                 data_list[i]->snd_count++;
 9875                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 9876                                 /* record the time */
 9877                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
 9878                                 if (data_list[i]->book_size_scale) {
 9879                                         /*
 9880                                          * need to double the book size on
 9881                                          * this one
 9882                                          */
 9883                                         data_list[i]->book_size_scale = 0;
 9884                                         /*
 9885                                          * Since we double the booksize, we
 9886                                          * must also double the output queue
 9887                                          * size, since this get shrunk when
 9888                                          * we free by this amount.
 9889                                          */
 9890                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
 9891                                         data_list[i]->book_size *= 2;
 9892 
 9893 
 9894                                 } else {
 9895                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 9896                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 9897                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 9898                                         }
 9899                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 9900                                             (uint32_t)(data_list[i]->send_size +
 9901                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 9902                                 }
 9903                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 9904                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
 9905                                             data_list[i]->whoTo->flight_size,
 9906                                             data_list[i]->book_size,
 9907                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 9908                                             data_list[i]->rec.data.tsn);
 9909                                 }
 9910                                 sctp_flight_size_increase(data_list[i]);
 9911                                 sctp_total_flight_increase(stcb, data_list[i]);
 9912                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 9913                                         /* SWS sender side engages */
 9914                                         asoc->peers_rwnd = 0;
 9915                                 }
 9916                                 if ((i == 0) &&
 9917                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
 9918                                         SCTP_STAT_INCR(sctps_sendfastretrans);
 9919                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
 9920                                             (tmr_started == 0)) {
 9921                                                 /*-
 9922                                                  * ok we just fast-retrans'd
 9923                                                  * the lowest TSN, i.e the
 9924                                                  * first on the list. In
 9925                                                  * this case we want to give
 9926                                                  * some more time to get a
 9927                                                  * SACK back without a
 9928                                                  * t3-expiring.
 9929                                                  */
 9930                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
 9931                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
 9932                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9933                                         }
 9934                                 }
 9935                         }
 9936                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 9937                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
 9938                         }
 9939 #ifdef SCTP_AUDITING_ENABLED
 9940                         sctp_auditing(21, inp, stcb, NULL);
 9941 #endif
 9942                 } else {
 9943                         /* None will fit */
 9944                         return (1);
 9945                 }
 9946                 if (asoc->sent_queue_retran_cnt <= 0) {
 9947                         /* all done we have no more to retran */
 9948                         asoc->sent_queue_retran_cnt = 0;
 9949                         break;
 9950                 }
 9951                 if (one_chunk) {
 9952                         /* No more room in rwnd */
 9953                         return (1);
 9954                 }
 9955                 /* stop the for loop here. we sent out a packet */
 9956                 break;
 9957         }
 9958         return (0);
 9959 }
 9960 
 9961 static void
 9962 sctp_timer_validation(struct sctp_inpcb *inp,
 9963     struct sctp_tcb *stcb,
 9964     struct sctp_association *asoc)
 9965 {
 9966         struct sctp_nets *net;
 9967 
 9968         /* Validate that a timer is running somewhere */
 9969         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 9970                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9971                         /* Here is a timer */
 9972                         return;
 9973                 }
 9974         }
 9975         SCTP_TCB_LOCK_ASSERT(stcb);
 9976         /* Gak, we did not have a timer somewhere */
 9977         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
 9978         if (asoc->alternate) {
 9979                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
 9980         } else {
 9981                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 9982         }
 9983         return;
 9984 }
 9985 
 9986 void
 9987 sctp_chunk_output(struct sctp_inpcb *inp,
 9988     struct sctp_tcb *stcb,
 9989     int from_where,
 9990     int so_locked
 9991 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9992     SCTP_UNUSED
 9993 #endif
 9994 )
 9995 {
 9996         /*-
 9997          * Ok this is the generic chunk service queue. we must do the
 9998          * following:
 9999          * - See if there are retransmits pending, if so we must
10000          *   do these first.
10001          * - Service the stream queue that is next, moving any
10002          *   message (note I must get a complete message i.e.
10003          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
10004          *   TSN's
10005          * - Check to see if the cwnd/rwnd allows any output, if so we
10006          *   go ahead and fomulate and send the low level chunks. Making sure
10007          *   to combine any control in the control chunk queue also.
10008          */
10009         struct sctp_association *asoc;
10010         struct sctp_nets *net;
10011         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
10012         unsigned int burst_cnt = 0;
10013         struct timeval now;
10014         int now_filled = 0;
10015         int nagle_on;
10016         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
10017         int un_sent = 0;
10018         int fr_done;
10019         unsigned int tot_frs = 0;
10020 
10021         asoc = &stcb->asoc;
10022 do_it_again:
10023         /* The Nagle algorithm is only applied when handling a send call. */
10024         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
10025                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
10026                         nagle_on = 0;
10027                 } else {
10028                         nagle_on = 1;
10029                 }
10030         } else {
10031                 nagle_on = 0;
10032         }
10033         SCTP_TCB_LOCK_ASSERT(stcb);
10034 
10035         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
10036 
10037         if ((un_sent <= 0) &&
10038             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
10039             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
10040             (asoc->sent_queue_retran_cnt == 0) &&
10041             (asoc->trigger_reset == 0)) {
10042                 /* Nothing to do unless there is something to be sent left */
10043                 return;
10044         }
10045         /*
10046          * Do we have something to send, data or control AND a sack timer
10047          * running, if so piggy-back the sack.
10048          */
10049         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
10050                 sctp_send_sack(stcb, so_locked);
10051                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
10052         }
10053         while (asoc->sent_queue_retran_cnt) {
10054                 /*-
10055                  * Ok, it is retransmission time only, we send out only ONE
10056                  * packet with a single call off to the retran code.
10057                  */
10058                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
10059                         /*-
10060                          * Special hook for handling cookiess discarded
10061                          * by peer that carried data. Send cookie-ack only
10062                          * and then the next call with get the retran's.
10063                          */
10064                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10065                             from_where,
10066                             &now, &now_filled, frag_point, so_locked);
10067                         return;
10068                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10069                         /* if its not from a HB then do it */
10070                         fr_done = 0;
10071                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10072                         if (fr_done) {
10073                                 tot_frs++;
10074                         }
10075                 } else {
10076                         /*
10077                          * its from any other place, we don't allow retran
10078                          * output (only control)
10079                          */
10080                         ret = 1;
10081                 }
10082                 if (ret > 0) {
10083                         /* Can't send anymore */
10084                         /*-
10085                          * now lets push out control by calling med-level
10086                          * output once. this assures that we WILL send HB's
10087                          * if queued too.
10088                          */
10089                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10090                             from_where,
10091                             &now, &now_filled, frag_point, so_locked);
10092 #ifdef SCTP_AUDITING_ENABLED
10093                         sctp_auditing(8, inp, stcb, NULL);
10094 #endif
10095                         sctp_timer_validation(inp, stcb, asoc);
10096                         return;
10097                 }
10098                 if (ret < 0) {
10099                         /*-
10100                          * The count was off.. retran is not happening so do
10101                          * the normal retransmission.
10102                          */
10103 #ifdef SCTP_AUDITING_ENABLED
10104                         sctp_auditing(9, inp, stcb, NULL);
10105 #endif
10106                         if (ret == SCTP_RETRAN_EXIT) {
10107                                 return;
10108                         }
10109                         break;
10110                 }
10111                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10112                         /* Only one transmission allowed out of a timeout */
10113 #ifdef SCTP_AUDITING_ENABLED
10114                         sctp_auditing(10, inp, stcb, NULL);
10115 #endif
10116                         /* Push out any control */
10117                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10118                             &now, &now_filled, frag_point, so_locked);
10119                         return;
10120                 }
10121                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10122                         /* Hit FR burst limit */
10123                         return;
10124                 }
10125                 if ((num_out == 0) && (ret == 0)) {
10126                         /* No more retrans to send */
10127                         break;
10128                 }
10129         }
10130 #ifdef SCTP_AUDITING_ENABLED
10131         sctp_auditing(12, inp, stcb, NULL);
10132 #endif
10133         /* Check for bad destinations, if they exist move chunks around. */
10134         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10135                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10136                         /*-
10137                          * if possible move things off of this address we
10138                          * still may send below due to the dormant state but
10139                          * we try to find an alternate address to send to
10140                          * and if we have one we move all queued data on the
10141                          * out wheel to this alternate address.
10142                          */
10143                         if (net->ref_count > 1)
10144                                 sctp_move_chunks_from_net(stcb, net);
10145                 } else {
10146                         /*-
10147                          * if ((asoc->sat_network) || (net->addr_is_local))
10148                          * { burst_limit = asoc->max_burst *
10149                          * SCTP_SAT_NETWORK_BURST_INCR; }
10150                          */
10151                         if (asoc->max_burst > 0) {
10152                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10153                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10154                                                 /*
10155                                                  * JRS - Use the congestion
10156                                                  * control given in the
10157                                                  * congestion control module
10158                                                  */
10159                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10160                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10161                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10162                                                 }
10163                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10164                                         }
10165                                         net->fast_retran_ip = 0;
10166                                 } else {
10167                                         if (net->flight_size == 0) {
10168                                                 /*
10169                                                  * Should be decaying the
10170                                                  * cwnd here
10171                                                  */
10172                                                 ;
10173                                         }
10174                                 }
10175                         }
10176                 }
10177 
10178         }
10179         burst_cnt = 0;
10180         do {
10181                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10182                     &reason_code, 0, from_where,
10183                     &now, &now_filled, frag_point, so_locked);
10184                 if (error) {
10185                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10186                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10187                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10188                         }
10189                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10190                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10191                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10192                         }
10193                         break;
10194                 }
10195                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10196 
10197                 tot_out += num_out;
10198                 burst_cnt++;
10199                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10200                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10201                         if (num_out == 0) {
10202                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10203                         }
10204                 }
10205                 if (nagle_on) {
10206                         /*
10207                          * When the Nagle algorithm is used, look at how
10208                          * much is unsent, then if its smaller than an MTU
10209                          * and we have data in flight we stop, except if we
10210                          * are handling a fragmented user message.
10211                          */
10212                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10213                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10214                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10215                             (stcb->asoc.total_flight > 0)) {
10216 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10217                                 break;
10218                         }
10219                 }
10220                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10221                     TAILQ_EMPTY(&asoc->send_queue) &&
10222                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10223                         /* Nothing left to send */
10224                         break;
10225                 }
10226                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10227                         /* Nothing left to send */
10228                         break;
10229                 }
10230         } while (num_out &&
10231             ((asoc->max_burst == 0) ||
10232             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10233             (burst_cnt < asoc->max_burst)));
10234 
10235         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10236                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10237                         SCTP_STAT_INCR(sctps_maxburstqueued);
10238                         asoc->burst_limit_applied = 1;
10239                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10240                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10241                         }
10242                 } else {
10243                         asoc->burst_limit_applied = 0;
10244                 }
10245         }
10246         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10247                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10248         }
10249         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10250             tot_out);
10251 
10252         /*-
10253          * Now we need to clean up the control chunk chain if a ECNE is on
10254          * it. It must be marked as UNSENT again so next call will continue
10255          * to send it until such time that we get a CWR, to remove it.
10256          */
10257         if (stcb->asoc.ecn_echo_cnt_onq)
10258                 sctp_fix_ecn_echo(asoc);
10259 
10260         if (stcb->asoc.trigger_reset) {
10261                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10262                         goto do_it_again;
10263                 }
10264         }
10265         return;
10266 }
10267 
10268 
10269 int
10270 sctp_output(
10271     struct sctp_inpcb *inp,
10272     struct mbuf *m,
10273     struct sockaddr *addr,
10274     struct mbuf *control,
10275     struct thread *p,
10276     int flags)
10277 {
10278         if (inp == NULL) {
10279                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10280                 return (EINVAL);
10281         }
10282         if (inp->sctp_socket == NULL) {
10283                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10284                 return (EINVAL);
10285         }
10286         return (sctp_sosend(inp->sctp_socket,
10287             addr,
10288             (struct uio *)NULL,
10289             m,
10290             control,
10291             flags, p
10292             ));
10293 }
10294 
10295 void
10296 send_forward_tsn(struct sctp_tcb *stcb,
10297     struct sctp_association *asoc)
10298 {
10299         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10300         struct sctp_forward_tsn_chunk *fwdtsn;
10301         struct sctp_strseq *strseq;
10302         struct sctp_strseq_mid *strseq_m;
10303         uint32_t advance_peer_ack_point;
10304         unsigned int cnt_of_space, i, ovh;
10305         unsigned int space_needed;
10306         unsigned int cnt_of_skipped = 0;
10307 
10308         SCTP_TCB_LOCK_ASSERT(stcb);
10309         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10310                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10311                         /* mark it to unsent */
10312                         chk->sent = SCTP_DATAGRAM_UNSENT;
10313                         chk->snd_count = 0;
10314                         /* Do we correct its output location? */
10315                         if (chk->whoTo) {
10316                                 sctp_free_remote_addr(chk->whoTo);
10317                                 chk->whoTo = NULL;
10318                         }
10319                         goto sctp_fill_in_rest;
10320                 }
10321         }
10322         /* Ok if we reach here we must build one */
10323         sctp_alloc_a_chunk(stcb, chk);
10324         if (chk == NULL) {
10325                 return;
10326         }
10327         asoc->fwd_tsn_cnt++;
10328         chk->copy_by_ref = 0;
10329         /*
10330          * We don't do the old thing here since this is used not for on-wire
10331          * but to tell if we are sending a fwd-tsn by the stack during
10332          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10333          */
10334         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10335         chk->rec.chunk_id.can_take_data = 0;
10336         chk->flags = 0;
10337         chk->asoc = asoc;
10338         chk->whoTo = NULL;
10339         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10340         if (chk->data == NULL) {
10341                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10342                 return;
10343         }
10344         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10345         chk->sent = SCTP_DATAGRAM_UNSENT;
10346         chk->snd_count = 0;
10347         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10348         asoc->ctrl_queue_cnt++;
10349 sctp_fill_in_rest:
10350         /*-
10351          * Here we go through and fill out the part that deals with
10352          * stream/seq of the ones we skip.
10353          */
10354         SCTP_BUF_LEN(chk->data) = 0;
10355         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10356                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10357                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10358                         /* no more to look at */
10359                         break;
10360                 }
10361                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10362                         /* We don't report these */
10363                         continue;
10364                 }
10365                 cnt_of_skipped++;
10366         }
10367         if (asoc->idata_supported) {
10368                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10369                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10370         } else {
10371                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10372                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10373         }
10374         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10375 
10376         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10377                 ovh = SCTP_MIN_OVERHEAD;
10378         } else {
10379                 ovh = SCTP_MIN_V4_OVERHEAD;
10380         }
10381         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10382                 /* trim to a mtu size */
10383                 cnt_of_space = asoc->smallest_mtu - ovh;
10384         }
10385         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10386                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10387                     0xff, 0, cnt_of_skipped,
10388                     asoc->advanced_peer_ack_point);
10389         }
10390         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10391         if (cnt_of_space < space_needed) {
10392                 /*-
10393                  * ok we must trim down the chunk by lowering the
10394                  * advance peer ack point.
10395                  */
10396                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10397                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10398                             0xff, 0xff, cnt_of_space,
10399                             space_needed);
10400                 }
10401                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10402                 if (asoc->idata_supported) {
10403                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10404                 } else {
10405                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10406                 }
10407                 /*-
10408                  * Go through and find the TSN that will be the one
10409                  * we report.
10410                  */
10411                 at = TAILQ_FIRST(&asoc->sent_queue);
10412                 if (at != NULL) {
10413                         for (i = 0; i < cnt_of_skipped; i++) {
10414                                 tp1 = TAILQ_NEXT(at, sctp_next);
10415                                 if (tp1 == NULL) {
10416                                         break;
10417                                 }
10418                                 at = tp1;
10419                         }
10420                 }
10421                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10422                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10423                             0xff, cnt_of_skipped, at->rec.data.tsn,
10424                             asoc->advanced_peer_ack_point);
10425                 }
10426                 last = at;
10427                 /*-
10428                  * last now points to last one I can report, update
10429                  * peer ack point
10430                  */
10431                 if (last) {
10432                         advance_peer_ack_point = last->rec.data.tsn;
10433                 }
10434                 if (asoc->idata_supported) {
10435                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10436                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10437                 } else {
10438                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10439                             cnt_of_skipped * sizeof(struct sctp_strseq);
10440                 }
10441         }
10442         chk->send_size = space_needed;
10443         /* Setup the chunk */
10444         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10445         fwdtsn->ch.chunk_length = htons(chk->send_size);
10446         fwdtsn->ch.chunk_flags = 0;
10447         if (asoc->idata_supported) {
10448                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10449         } else {
10450                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10451         }
10452         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10453         SCTP_BUF_LEN(chk->data) = chk->send_size;
10454         fwdtsn++;
10455         /*-
10456          * Move pointer to after the fwdtsn and transfer to the
10457          * strseq pointer.
10458          */
10459         if (asoc->idata_supported) {
10460                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10461                 strseq = NULL;
10462         } else {
10463                 strseq = (struct sctp_strseq *)fwdtsn;
10464                 strseq_m = NULL;
10465         }
10466         /*-
10467          * Now populate the strseq list. This is done blindly
10468          * without pulling out duplicate stream info. This is
10469          * inefficent but won't harm the process since the peer will
10470          * look at these in sequence and will thus release anything.
10471          * It could mean we exceed the PMTU and chop off some that
10472          * we could have included.. but this is unlikely (aka 1432/4
10473          * would mean 300+ stream seq's would have to be reported in
10474          * one FWD-TSN. With a bit of work we can later FIX this to
10475          * optimize and pull out duplicates.. but it does add more
10476          * overhead. So for now... not!
10477          */
10478         i = 0;
10479         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10480                 if (i >= cnt_of_skipped) {
10481                         break;
10482                 }
10483                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10484                         /* We don't report these */
10485                         continue;
10486                 }
10487                 if (at->rec.data.tsn == advance_peer_ack_point) {
10488                         at->rec.data.fwd_tsn_cnt = 0;
10489                 }
10490                 if (asoc->idata_supported) {
10491                         strseq_m->sid = htons(at->rec.data.sid);
10492                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10493                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10494                         } else {
10495                                 strseq_m->flags = 0;
10496                         }
10497                         strseq_m->mid = htonl(at->rec.data.mid);
10498                         strseq_m++;
10499                 } else {
10500                         strseq->sid = htons(at->rec.data.sid);
10501                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10502                         strseq++;
10503                 }
10504                 i++;
10505         }
10506         return;
10507 }
10508 
10509 void
10510 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10511 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10512     SCTP_UNUSED
10513 #endif
10514 )
10515 {
10516         /*-
10517          * Queue up a SACK or NR-SACK in the control queue.
10518          * We must first check to see if a SACK or NR-SACK is
10519          * somehow on the control queue.
10520          * If so, we will take and and remove the old one.
10521          */
10522         struct sctp_association *asoc;
10523         struct sctp_tmit_chunk *chk, *a_chk;
10524         struct sctp_sack_chunk *sack;
10525         struct sctp_nr_sack_chunk *nr_sack;
10526         struct sctp_gap_ack_block *gap_descriptor;
10527         const struct sack_track *selector;
10528         int mergeable = 0;
10529         int offset;
10530         caddr_t limit;
10531         uint32_t *dup;
10532         int limit_reached = 0;
10533         unsigned int i, siz, j;
10534         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10535         int num_dups = 0;
10536         int space_req;
10537         uint32_t highest_tsn;
10538         uint8_t flags;
10539         uint8_t type;
10540         uint8_t tsn_map;
10541 
10542         if (stcb->asoc.nrsack_supported == 1) {
10543                 type = SCTP_NR_SELECTIVE_ACK;
10544         } else {
10545                 type = SCTP_SELECTIVE_ACK;
10546         }
10547         a_chk = NULL;
10548         asoc = &stcb->asoc;
10549         SCTP_TCB_LOCK_ASSERT(stcb);
10550         if (asoc->last_data_chunk_from == NULL) {
10551                 /* Hmm we never received anything */
10552                 return;
10553         }
10554         sctp_slide_mapping_arrays(stcb);
10555         sctp_set_rwnd(stcb, asoc);
10556         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10557                 if (chk->rec.chunk_id.id == type) {
10558                         /* Hmm, found a sack already on queue, remove it */
10559                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10560                         asoc->ctrl_queue_cnt--;
10561                         a_chk = chk;
10562                         if (a_chk->data) {
10563                                 sctp_m_freem(a_chk->data);
10564                                 a_chk->data = NULL;
10565                         }
10566                         if (a_chk->whoTo) {
10567                                 sctp_free_remote_addr(a_chk->whoTo);
10568                                 a_chk->whoTo = NULL;
10569                         }
10570                         break;
10571                 }
10572         }
10573         if (a_chk == NULL) {
10574                 sctp_alloc_a_chunk(stcb, a_chk);
10575                 if (a_chk == NULL) {
10576                         /* No memory so we drop the idea, and set a timer */
10577                         if (stcb->asoc.delayed_ack) {
10578                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10579                                     stcb->sctp_ep, stcb, NULL,
10580                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10581                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10582                                     stcb->sctp_ep, stcb, NULL);
10583                         } else {
10584                                 stcb->asoc.send_sack = 1;
10585                         }
10586                         return;
10587                 }
10588                 a_chk->copy_by_ref = 0;
10589                 a_chk->rec.chunk_id.id = type;
10590                 a_chk->rec.chunk_id.can_take_data = 1;
10591         }
10592         /* Clear our pkt counts */
10593         asoc->data_pkts_seen = 0;
10594 
10595         a_chk->flags = 0;
10596         a_chk->asoc = asoc;
10597         a_chk->snd_count = 0;
10598         a_chk->send_size = 0;   /* fill in later */
10599         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10600         a_chk->whoTo = NULL;
10601 
10602         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10603                 /*-
10604                  * Ok, the destination for the SACK is unreachable, lets see if
10605                  * we can select an alternate to asoc->last_data_chunk_from
10606                  */
10607                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10608                 if (a_chk->whoTo == NULL) {
10609                         /* Nope, no alternate */
10610                         a_chk->whoTo = asoc->last_data_chunk_from;
10611                 }
10612         } else {
10613                 a_chk->whoTo = asoc->last_data_chunk_from;
10614         }
10615         if (a_chk->whoTo) {
10616                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10617         }
10618         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10619                 highest_tsn = asoc->highest_tsn_inside_map;
10620         } else {
10621                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10622         }
10623         if (highest_tsn == asoc->cumulative_tsn) {
10624                 /* no gaps */
10625                 if (type == SCTP_SELECTIVE_ACK) {
10626                         space_req = sizeof(struct sctp_sack_chunk);
10627                 } else {
10628                         space_req = sizeof(struct sctp_nr_sack_chunk);
10629                 }
10630         } else {
10631                 /* gaps get a cluster */
10632                 space_req = MCLBYTES;
10633         }
10634         /* Ok now lets formulate a MBUF with our sack */
10635         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10636         if ((a_chk->data == NULL) ||
10637             (a_chk->whoTo == NULL)) {
10638                 /* rats, no mbuf memory */
10639                 if (a_chk->data) {
10640                         /* was a problem with the destination */
10641                         sctp_m_freem(a_chk->data);
10642                         a_chk->data = NULL;
10643                 }
10644                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10645                 /* sa_ignore NO_NULL_CHK */
10646                 if (stcb->asoc.delayed_ack) {
10647                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10648                             stcb->sctp_ep, stcb, NULL,
10649                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10650                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10651                             stcb->sctp_ep, stcb, NULL);
10652                 } else {
10653                         stcb->asoc.send_sack = 1;
10654                 }
10655                 return;
10656         }
10657         /* ok, lets go through and fill it in */
10658         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10659         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10660         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10661                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10662         }
10663         limit = mtod(a_chk->data, caddr_t);
10664         limit += space;
10665 
10666         flags = 0;
10667 
10668         if ((asoc->sctp_cmt_on_off > 0) &&
10669             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10670                 /*-
10671                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10672                  * received, then set high bit to 1, else 0. Reset
10673                  * pkts_rcvd.
10674                  */
10675                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10676                 asoc->cmt_dac_pkts_rcvd = 0;
10677         }
10678 #ifdef SCTP_ASOCLOG_OF_TSNS
10679         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10680         stcb->asoc.cumack_log_atsnt++;
10681         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10682                 stcb->asoc.cumack_log_atsnt = 0;
10683         }
10684 #endif
10685         /* reset the readers interpretation */
10686         stcb->freed_by_sorcv_sincelast = 0;
10687 
10688         if (type == SCTP_SELECTIVE_ACK) {
10689                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10690                 nr_sack = NULL;
10691                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10692                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10693                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10694                 } else {
10695                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10696                 }
10697         } else {
10698                 sack = NULL;
10699                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10700                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10701                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10702                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10703                 } else {
10704                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10705                 }
10706         }
10707 
10708         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10709                 offset = 1;
10710         } else {
10711                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10712         }
10713         if (((type == SCTP_SELECTIVE_ACK) &&
10714             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10715             ((type == SCTP_NR_SELECTIVE_ACK) &&
10716             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10717                 /* we have a gap .. maybe */
10718                 for (i = 0; i < siz; i++) {
10719                         tsn_map = asoc->mapping_array[i];
10720                         if (type == SCTP_SELECTIVE_ACK) {
10721                                 tsn_map |= asoc->nr_mapping_array[i];
10722                         }
10723                         if (i == 0) {
10724                                 /*
10725                                  * Clear all bits corresponding to TSNs
10726                                  * smaller or equal to the cumulative TSN.
10727                                  */
10728                                 tsn_map &= (~0U << (1 - offset));
10729                         }
10730                         selector = &sack_array[tsn_map];
10731                         if (mergeable && selector->right_edge) {
10732                                 /*
10733                                  * Backup, left and right edges were ok to
10734                                  * merge.
10735                                  */
10736                                 num_gap_blocks--;
10737                                 gap_descriptor--;
10738                         }
10739                         if (selector->num_entries == 0)
10740                                 mergeable = 0;
10741                         else {
10742                                 for (j = 0; j < selector->num_entries; j++) {
10743                                         if (mergeable && selector->right_edge) {
10744                                                 /*
10745                                                  * do a merge by NOT setting
10746                                                  * the left side
10747                                                  */
10748                                                 mergeable = 0;
10749                                         } else {
10750                                                 /*
10751                                                  * no merge, set the left
10752                                                  * side
10753                                                  */
10754                                                 mergeable = 0;
10755                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10756                                         }
10757                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10758                                         num_gap_blocks++;
10759                                         gap_descriptor++;
10760                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10761                                                 /* no more room */
10762                                                 limit_reached = 1;
10763                                                 break;
10764                                         }
10765                                 }
10766                                 if (selector->left_edge) {
10767                                         mergeable = 1;
10768                                 }
10769                         }
10770                         if (limit_reached) {
10771                                 /* Reached the limit stop */
10772                                 break;
10773                         }
10774                         offset += 8;
10775                 }
10776         }
10777         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10778             (limit_reached == 0)) {
10779 
10780                 mergeable = 0;
10781 
10782                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10783                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10784                 } else {
10785                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10786                 }
10787 
10788                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10789                         offset = 1;
10790                 } else {
10791                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10792                 }
10793                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10794                         /* we have a gap .. maybe */
10795                         for (i = 0; i < siz; i++) {
10796                                 tsn_map = asoc->nr_mapping_array[i];
10797                                 if (i == 0) {
10798                                         /*
10799                                          * Clear all bits corresponding to
10800                                          * TSNs smaller or equal to the
10801                                          * cumulative TSN.
10802                                          */
10803                                         tsn_map &= (~0U << (1 - offset));
10804                                 }
10805                                 selector = &sack_array[tsn_map];
10806                                 if (mergeable && selector->right_edge) {
10807                                         /*
10808                                          * Backup, left and right edges were
10809                                          * ok to merge.
10810                                          */
10811                                         num_nr_gap_blocks--;
10812                                         gap_descriptor--;
10813                                 }
10814                                 if (selector->num_entries == 0)
10815                                         mergeable = 0;
10816                                 else {
10817                                         for (j = 0; j < selector->num_entries; j++) {
10818                                                 if (mergeable && selector->right_edge) {
10819                                                         /*
10820                                                          * do a merge by NOT
10821                                                          * setting the left
10822                                                          * side
10823                                                          */
10824                                                         mergeable = 0;
10825                                                 } else {
10826                                                         /*
10827                                                          * no merge, set the
10828                                                          * left side
10829                                                          */
10830                                                         mergeable = 0;
10831                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10832                                                 }
10833                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10834                                                 num_nr_gap_blocks++;
10835                                                 gap_descriptor++;
10836                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10837                                                         /* no more room */
10838                                                         limit_reached = 1;
10839                                                         break;
10840                                                 }
10841                                         }
10842                                         if (selector->left_edge) {
10843                                                 mergeable = 1;
10844                                         }
10845                                 }
10846                                 if (limit_reached) {
10847                                         /* Reached the limit stop */
10848                                         break;
10849                                 }
10850                                 offset += 8;
10851                         }
10852                 }
10853         }
10854         /* now we must add any dups we are going to report. */
10855         if ((limit_reached == 0) && (asoc->numduptsns)) {
10856                 dup = (uint32_t *)gap_descriptor;
10857                 for (i = 0; i < asoc->numduptsns; i++) {
10858                         *dup = htonl(asoc->dup_tsns[i]);
10859                         dup++;
10860                         num_dups++;
10861                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10862                                 /* no more room */
10863                                 break;
10864                         }
10865                 }
10866                 asoc->numduptsns = 0;
10867         }
10868         /*
10869          * now that the chunk is prepared queue it to the control chunk
10870          * queue.
10871          */
10872         if (type == SCTP_SELECTIVE_ACK) {
10873                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10874                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10875                     num_dups * sizeof(int32_t));
10876                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10877                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10878                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10879                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10880                 sack->sack.num_dup_tsns = htons(num_dups);
10881                 sack->ch.chunk_type = type;
10882                 sack->ch.chunk_flags = flags;
10883                 sack->ch.chunk_length = htons(a_chk->send_size);
10884         } else {
10885                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10886                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10887                     num_dups * sizeof(int32_t));
10888                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10889                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10890                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10891                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10892                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10893                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10894                 nr_sack->nr_sack.reserved = 0;
10895                 nr_sack->ch.chunk_type = type;
10896                 nr_sack->ch.chunk_flags = flags;
10897                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10898         }
10899         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10900         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10901         asoc->ctrl_queue_cnt++;
10902         asoc->send_sack = 0;
10903         SCTP_STAT_INCR(sctps_sendsacks);
10904         return;
10905 }
10906 
10907 void
10908 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10909 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10910     SCTP_UNUSED
10911 #endif
10912 )
10913 {
10914         struct mbuf *m_abort, *m, *m_last;
10915         struct mbuf *m_out, *m_end = NULL;
10916         struct sctp_abort_chunk *abort;
10917         struct sctp_auth_chunk *auth = NULL;
10918         struct sctp_nets *net;
10919         uint32_t vtag;
10920         uint32_t auth_offset = 0;
10921         int error;
10922         uint16_t cause_len, chunk_len, padding_len;
10923 
10924         SCTP_TCB_LOCK_ASSERT(stcb);
10925         /*-
10926          * Add an AUTH chunk, if chunk requires it and save the offset into
10927          * the chain for AUTH
10928          */
10929         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10930             stcb->asoc.peer_auth_chunks)) {
10931                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10932                     stcb, SCTP_ABORT_ASSOCIATION);
10933                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10934         } else {
10935                 m_out = NULL;
10936         }
10937         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10938         if (m_abort == NULL) {
10939                 if (m_out) {
10940                         sctp_m_freem(m_out);
10941                 }
10942                 if (operr) {
10943                         sctp_m_freem(operr);
10944                 }
10945                 return;
10946         }
10947         /* link in any error */
10948         SCTP_BUF_NEXT(m_abort) = operr;
10949         cause_len = 0;
10950         m_last = NULL;
10951         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10952                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10953                 if (SCTP_BUF_NEXT(m) == NULL) {
10954                         m_last = m;
10955                 }
10956         }
10957         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10958         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10959         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10960         if (m_out == NULL) {
10961                 /* NO Auth chunk prepended, so reserve space in front */
10962                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10963                 m_out = m_abort;
10964         } else {
10965                 /* Put AUTH chunk at the front of the chain */
10966                 SCTP_BUF_NEXT(m_end) = m_abort;
10967         }
10968         if (stcb->asoc.alternate) {
10969                 net = stcb->asoc.alternate;
10970         } else {
10971                 net = stcb->asoc.primary_destination;
10972         }
10973         /* Fill in the ABORT chunk header. */
10974         abort = mtod(m_abort, struct sctp_abort_chunk *);
10975         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10976         if (stcb->asoc.peer_vtag == 0) {
10977                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10978                 vtag = stcb->asoc.my_vtag;
10979                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10980         } else {
10981                 vtag = stcb->asoc.peer_vtag;
10982                 abort->ch.chunk_flags = 0;
10983         }
10984         abort->ch.chunk_length = htons(chunk_len);
10985         /* Add padding, if necessary. */
10986         if (padding_len > 0) {
10987                 if ((m_last == NULL) ||
10988                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10989                         sctp_m_freem(m_out);
10990                         return;
10991                 }
10992         }
10993         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10994             (struct sockaddr *)&net->ro._l_addr,
10995             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10996             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10997             stcb->asoc.primary_destination->port, NULL,
10998             0, 0,
10999             so_locked))) {
11000                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11001                 if (error == ENOBUFS) {
11002                         stcb->asoc.ifp_had_enobuf = 1;
11003                         SCTP_STAT_INCR(sctps_lowlevelerr);
11004                 }
11005         } else {
11006                 stcb->asoc.ifp_had_enobuf = 0;
11007         }
11008         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11009 }
11010 
11011 void
11012 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
11013     struct sctp_nets *net,
11014     int reflect_vtag)
11015 {
11016         /* formulate and SEND a SHUTDOWN-COMPLETE */
11017         struct mbuf *m_shutdown_comp;
11018         struct sctp_shutdown_complete_chunk *shutdown_complete;
11019         uint32_t vtag;
11020         int error;
11021         uint8_t flags;
11022 
11023         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
11024         if (m_shutdown_comp == NULL) {
11025                 /* no mbuf's */
11026                 return;
11027         }
11028         if (reflect_vtag) {
11029                 flags = SCTP_HAD_NO_TCB;
11030                 vtag = stcb->asoc.my_vtag;
11031         } else {
11032                 flags = 0;
11033                 vtag = stcb->asoc.peer_vtag;
11034         }
11035         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
11036         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
11037         shutdown_complete->ch.chunk_flags = flags;
11038         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
11039         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
11040         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
11041             (struct sockaddr *)&net->ro._l_addr,
11042             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
11043             stcb->sctp_ep->sctp_lport, stcb->rport,
11044             htonl(vtag),
11045             net->port, NULL,
11046             0, 0,
11047             SCTP_SO_NOT_LOCKED))) {
11048                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
11049                 if (error == ENOBUFS) {
11050                         stcb->asoc.ifp_had_enobuf = 1;
11051                         SCTP_STAT_INCR(sctps_lowlevelerr);
11052                 }
11053         } else {
11054                 stcb->asoc.ifp_had_enobuf = 0;
11055         }
11056         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11057         return;
11058 }
11059 
11060 static void
11061 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
11062     struct sctphdr *sh, uint32_t vtag,
11063     uint8_t type, struct mbuf *cause,
11064     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11065     uint32_t vrf_id, uint16_t port)
11066 {
11067         struct mbuf *o_pak;
11068         struct mbuf *mout;
11069         struct sctphdr *shout;
11070         struct sctp_chunkhdr *ch;
11071 #if defined(INET) || defined(INET6)
11072         struct udphdr *udp;
11073         int ret;
11074 #endif
11075         int len, cause_len, padding_len;
11076 #ifdef INET
11077         struct sockaddr_in *src_sin, *dst_sin;
11078         struct ip *ip;
11079 #endif
11080 #ifdef INET6
11081         struct sockaddr_in6 *src_sin6, *dst_sin6;
11082         struct ip6_hdr *ip6;
11083 #endif
11084 
11085         /* Compute the length of the cause and add final padding. */
11086         cause_len = 0;
11087         if (cause != NULL) {
11088                 struct mbuf *m_at, *m_last = NULL;
11089 
11090                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
11091                         if (SCTP_BUF_NEXT(m_at) == NULL)
11092                                 m_last = m_at;
11093                         cause_len += SCTP_BUF_LEN(m_at);
11094                 }
11095                 padding_len = cause_len % 4;
11096                 if (padding_len != 0) {
11097                         padding_len = 4 - padding_len;
11098                 }
11099                 if (padding_len != 0) {
11100                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11101                                 sctp_m_freem(cause);
11102                                 return;
11103                         }
11104                 }
11105         } else {
11106                 padding_len = 0;
11107         }
11108         /* Get an mbuf for the header. */
11109         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11110         switch (dst->sa_family) {
11111 #ifdef INET
11112         case AF_INET:
11113                 len += sizeof(struct ip);
11114                 break;
11115 #endif
11116 #ifdef INET6
11117         case AF_INET6:
11118                 len += sizeof(struct ip6_hdr);
11119                 break;
11120 #endif
11121         default:
11122                 break;
11123         }
11124 #if defined(INET) || defined(INET6)
11125         if (port) {
11126                 len += sizeof(struct udphdr);
11127         }
11128 #endif
11129         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11130         if (mout == NULL) {
11131                 if (cause) {
11132                         sctp_m_freem(cause);
11133                 }
11134                 return;
11135         }
11136         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11137         SCTP_BUF_LEN(mout) = len;
11138         SCTP_BUF_NEXT(mout) = cause;
11139         M_SETFIB(mout, fibnum);
11140         mout->m_pkthdr.flowid = mflowid;
11141         M_HASHTYPE_SET(mout, mflowtype);
11142 #ifdef INET
11143         ip = NULL;
11144 #endif
11145 #ifdef INET6
11146         ip6 = NULL;
11147 #endif
11148         switch (dst->sa_family) {
11149 #ifdef INET
11150         case AF_INET:
11151                 src_sin = (struct sockaddr_in *)src;
11152                 dst_sin = (struct sockaddr_in *)dst;
11153                 ip = mtod(mout, struct ip *);
11154                 ip->ip_v = IPVERSION;
11155                 ip->ip_hl = (sizeof(struct ip) >> 2);
11156                 ip->ip_tos = 0;
11157                 ip->ip_off = htons(IP_DF);
11158                 ip_fillid(ip);
11159                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11160                 if (port) {
11161                         ip->ip_p = IPPROTO_UDP;
11162                 } else {
11163                         ip->ip_p = IPPROTO_SCTP;
11164                 }
11165                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11166                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11167                 ip->ip_sum = 0;
11168                 len = sizeof(struct ip);
11169                 shout = (struct sctphdr *)((caddr_t)ip + len);
11170                 break;
11171 #endif
11172 #ifdef INET6
11173         case AF_INET6:
11174                 src_sin6 = (struct sockaddr_in6 *)src;
11175                 dst_sin6 = (struct sockaddr_in6 *)dst;
11176                 ip6 = mtod(mout, struct ip6_hdr *);
11177                 ip6->ip6_flow = htonl(0x60000000);
11178                 if (V_ip6_auto_flowlabel) {
11179                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11180                 }
11181                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11182                 if (port) {
11183                         ip6->ip6_nxt = IPPROTO_UDP;
11184                 } else {
11185                         ip6->ip6_nxt = IPPROTO_SCTP;
11186                 }
11187                 ip6->ip6_src = dst_sin6->sin6_addr;
11188                 ip6->ip6_dst = src_sin6->sin6_addr;
11189                 len = sizeof(struct ip6_hdr);
11190                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11191                 break;
11192 #endif
11193         default:
11194                 len = 0;
11195                 shout = mtod(mout, struct sctphdr *);
11196                 break;
11197         }
11198 #if defined(INET) || defined(INET6)
11199         if (port) {
11200                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11201                         sctp_m_freem(mout);
11202                         return;
11203                 }
11204                 udp = (struct udphdr *)shout;
11205                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11206                 udp->uh_dport = port;
11207                 udp->uh_sum = 0;
11208                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11209                     sizeof(struct sctphdr) +
11210                     sizeof(struct sctp_chunkhdr) +
11211                     cause_len + padding_len));
11212                 len += sizeof(struct udphdr);
11213                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11214         } else {
11215                 udp = NULL;
11216         }
11217 #endif
11218         shout->src_port = sh->dest_port;
11219         shout->dest_port = sh->src_port;
11220         shout->checksum = 0;
11221         if (vtag) {
11222                 shout->v_tag = htonl(vtag);
11223         } else {
11224                 shout->v_tag = sh->v_tag;
11225         }
11226         len += sizeof(struct sctphdr);
11227         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11228         ch->chunk_type = type;
11229         if (vtag) {
11230                 ch->chunk_flags = 0;
11231         } else {
11232                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11233         }
11234         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11235         len += sizeof(struct sctp_chunkhdr);
11236         len += cause_len + padding_len;
11237 
11238         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11239                 sctp_m_freem(mout);
11240                 return;
11241         }
11242         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11243         switch (dst->sa_family) {
11244 #ifdef INET
11245         case AF_INET:
11246                 if (port) {
11247                         if (V_udp_cksum) {
11248                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11249                         } else {
11250                                 udp->uh_sum = 0;
11251                         }
11252                 }
11253                 ip->ip_len = htons(len);
11254                 if (port) {
11255 #if defined(SCTP_WITH_NO_CSUM)
11256                         SCTP_STAT_INCR(sctps_sendnocrc);
11257 #else
11258                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11259                         SCTP_STAT_INCR(sctps_sendswcrc);
11260 #endif
11261                         if (V_udp_cksum) {
11262                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11263                         }
11264                 } else {
11265 #if defined(SCTP_WITH_NO_CSUM)
11266                         SCTP_STAT_INCR(sctps_sendnocrc);
11267 #else
11268                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11269                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11270                         SCTP_STAT_INCR(sctps_sendhwcrc);
11271 #endif
11272                 }
11273 #ifdef SCTP_PACKET_LOGGING
11274                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11275                         sctp_packet_log(o_pak);
11276                 }
11277 #endif
11278                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11279                 break;
11280 #endif
11281 #ifdef INET6
11282         case AF_INET6:
11283                 ip6->ip6_plen = (uint16_t)(len - sizeof(struct ip6_hdr));
11284                 if (port) {
11285 #if defined(SCTP_WITH_NO_CSUM)
11286                         SCTP_STAT_INCR(sctps_sendnocrc);
11287 #else
11288                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11289                         SCTP_STAT_INCR(sctps_sendswcrc);
11290 #endif
11291                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11292                                 udp->uh_sum = 0xffff;
11293                         }
11294                 } else {
11295 #if defined(SCTP_WITH_NO_CSUM)
11296                         SCTP_STAT_INCR(sctps_sendnocrc);
11297 #else
11298                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11299                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11300                         SCTP_STAT_INCR(sctps_sendhwcrc);
11301 #endif
11302                 }
11303 #ifdef SCTP_PACKET_LOGGING
11304                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11305                         sctp_packet_log(o_pak);
11306                 }
11307 #endif
11308                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11309                 break;
11310 #endif
11311         default:
11312                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11313                     dst->sa_family);
11314                 sctp_m_freem(mout);
11315                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11316                 return;
11317         }
11318         SCTP_STAT_INCR(sctps_sendpackets);
11319         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11320         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11321         return;
11322 }
11323 
11324 void
11325 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11326     struct sctphdr *sh,
11327     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11328     uint32_t vrf_id, uint16_t port)
11329 {
11330         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11331             mflowtype, mflowid, fibnum,
11332             vrf_id, port);
11333 }
11334 
11335 void
11336 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11337 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11338     SCTP_UNUSED
11339 #endif
11340 )
11341 {
11342         struct sctp_tmit_chunk *chk;
11343         struct sctp_heartbeat_chunk *hb;
11344         struct timeval now;
11345 
11346         SCTP_TCB_LOCK_ASSERT(stcb);
11347         if (net == NULL) {
11348                 return;
11349         }
11350         (void)SCTP_GETTIME_TIMEVAL(&now);
11351         switch (net->ro._l_addr.sa.sa_family) {
11352 #ifdef INET
11353         case AF_INET:
11354                 break;
11355 #endif
11356 #ifdef INET6
11357         case AF_INET6:
11358                 break;
11359 #endif
11360         default:
11361                 return;
11362         }
11363         sctp_alloc_a_chunk(stcb, chk);
11364         if (chk == NULL) {
11365                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11366                 return;
11367         }
11368         chk->copy_by_ref = 0;
11369         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11370         chk->rec.chunk_id.can_take_data = 1;
11371         chk->flags = 0;
11372         chk->asoc = &stcb->asoc;
11373         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11374 
11375         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11376         if (chk->data == NULL) {
11377                 sctp_free_a_chunk(stcb, chk, so_locked);
11378                 return;
11379         }
11380         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11381         SCTP_BUF_LEN(chk->data) = chk->send_size;
11382         chk->sent = SCTP_DATAGRAM_UNSENT;
11383         chk->snd_count = 0;
11384         chk->whoTo = net;
11385         atomic_add_int(&chk->whoTo->ref_count, 1);
11386         /* Now we have a mbuf that we can fill in with the details */
11387         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11388         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11389         /* fill out chunk header */
11390         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11391         hb->ch.chunk_flags = 0;
11392         hb->ch.chunk_length = htons(chk->send_size);
11393         /* Fill out hb parameter */
11394         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11395         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11396         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11397         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11398         /* Did our user request this one, put it in */
11399         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11400         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11401         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11402                 /*
11403                  * we only take from the entropy pool if the address is not
11404                  * confirmed.
11405                  */
11406                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11407                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11408         } else {
11409                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11410                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11411         }
11412         switch (net->ro._l_addr.sa.sa_family) {
11413 #ifdef INET
11414         case AF_INET:
11415                 memcpy(hb->heartbeat.hb_info.address,
11416                     &net->ro._l_addr.sin.sin_addr,
11417                     sizeof(net->ro._l_addr.sin.sin_addr));
11418                 break;
11419 #endif
11420 #ifdef INET6
11421         case AF_INET6:
11422                 memcpy(hb->heartbeat.hb_info.address,
11423                     &net->ro._l_addr.sin6.sin6_addr,
11424                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11425                 break;
11426 #endif
11427         default:
11428                 if (chk->data) {
11429                         sctp_m_freem(chk->data);
11430                         chk->data = NULL;
11431                 }
11432                 sctp_free_a_chunk(stcb, chk, so_locked);
11433                 return;
11434                 break;
11435         }
11436         net->hb_responded = 0;
11437         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11438         stcb->asoc.ctrl_queue_cnt++;
11439         SCTP_STAT_INCR(sctps_sendheartbeat);
11440         return;
11441 }
11442 
11443 void
11444 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11445     uint32_t high_tsn)
11446 {
11447         struct sctp_association *asoc;
11448         struct sctp_ecne_chunk *ecne;
11449         struct sctp_tmit_chunk *chk;
11450 
11451         if (net == NULL) {
11452                 return;
11453         }
11454         asoc = &stcb->asoc;
11455         SCTP_TCB_LOCK_ASSERT(stcb);
11456         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11457                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11458                         /* found a previous ECN_ECHO update it if needed */
11459                         uint32_t cnt, ctsn;
11460 
11461                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11462                         ctsn = ntohl(ecne->tsn);
11463                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11464                                 ecne->tsn = htonl(high_tsn);
11465                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11466                         }
11467                         cnt = ntohl(ecne->num_pkts_since_cwr);
11468                         cnt++;
11469                         ecne->num_pkts_since_cwr = htonl(cnt);
11470                         return;
11471                 }
11472         }
11473         /* nope could not find one to update so we must build one */
11474         sctp_alloc_a_chunk(stcb, chk);
11475         if (chk == NULL) {
11476                 return;
11477         }
11478         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11479         chk->copy_by_ref = 0;
11480         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11481         chk->rec.chunk_id.can_take_data = 0;
11482         chk->flags = 0;
11483         chk->asoc = &stcb->asoc;
11484         chk->send_size = sizeof(struct sctp_ecne_chunk);
11485         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11486         if (chk->data == NULL) {
11487                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11488                 return;
11489         }
11490         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11491         SCTP_BUF_LEN(chk->data) = chk->send_size;
11492         chk->sent = SCTP_DATAGRAM_UNSENT;
11493         chk->snd_count = 0;
11494         chk->whoTo = net;
11495         atomic_add_int(&chk->whoTo->ref_count, 1);
11496 
11497         stcb->asoc.ecn_echo_cnt_onq++;
11498         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11499         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11500         ecne->ch.chunk_flags = 0;
11501         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11502         ecne->tsn = htonl(high_tsn);
11503         ecne->num_pkts_since_cwr = htonl(1);
11504         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11505         asoc->ctrl_queue_cnt++;
11506 }
11507 
11508 void
11509 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11510     struct mbuf *m, int len, int iphlen, int bad_crc)
11511 {
11512         struct sctp_association *asoc;
11513         struct sctp_pktdrop_chunk *drp;
11514         struct sctp_tmit_chunk *chk;
11515         uint8_t *datap;
11516         int was_trunc = 0;
11517         int fullsz = 0;
11518         long spc;
11519         int offset;
11520         struct sctp_chunkhdr *ch, chunk_buf;
11521         unsigned int chk_length;
11522 
11523         if (!stcb) {
11524                 return;
11525         }
11526         asoc = &stcb->asoc;
11527         SCTP_TCB_LOCK_ASSERT(stcb);
11528         if (asoc->pktdrop_supported == 0) {
11529                 /*-
11530                  * peer must declare support before I send one.
11531                  */
11532                 return;
11533         }
11534         if (stcb->sctp_socket == NULL) {
11535                 return;
11536         }
11537         sctp_alloc_a_chunk(stcb, chk);
11538         if (chk == NULL) {
11539                 return;
11540         }
11541         chk->copy_by_ref = 0;
11542         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11543         chk->rec.chunk_id.can_take_data = 1;
11544         chk->flags = 0;
11545         len -= iphlen;
11546         chk->send_size = len;
11547         /* Validate that we do not have an ABORT in here. */
11548         offset = iphlen + sizeof(struct sctphdr);
11549         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11550             sizeof(*ch), (uint8_t *)&chunk_buf);
11551         while (ch != NULL) {
11552                 chk_length = ntohs(ch->chunk_length);
11553                 if (chk_length < sizeof(*ch)) {
11554                         /* break to abort land */
11555                         break;
11556                 }
11557                 switch (ch->chunk_type) {
11558                 case SCTP_PACKET_DROPPED:
11559                 case SCTP_ABORT_ASSOCIATION:
11560                 case SCTP_INITIATION_ACK:
11561                         /**
11562                          * We don't respond with an PKT-DROP to an ABORT
11563                          * or PKT-DROP. We also do not respond to an
11564                          * INIT-ACK, because we can't know if the initiation
11565                          * tag is correct or not.
11566                          */
11567                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11568                         return;
11569                 default:
11570                         break;
11571                 }
11572                 offset += SCTP_SIZE32(chk_length);
11573                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11574                     sizeof(*ch), (uint8_t *)&chunk_buf);
11575         }
11576 
11577         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11578             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11579                 /*
11580                  * only send 1 mtu worth, trim off the excess on the end.
11581                  */
11582                 fullsz = len;
11583                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11584                 was_trunc = 1;
11585         }
11586         chk->asoc = &stcb->asoc;
11587         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11588         if (chk->data == NULL) {
11589 jump_out:
11590                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11591                 return;
11592         }
11593         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11594         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11595         if (drp == NULL) {
11596                 sctp_m_freem(chk->data);
11597                 chk->data = NULL;
11598                 goto jump_out;
11599         }
11600         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11601             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11602         chk->book_size_scale = 0;
11603         if (was_trunc) {
11604                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11605                 drp->trunc_len = htons(fullsz);
11606                 /*
11607                  * Len is already adjusted to size minus overhead above take
11608                  * out the pkt_drop chunk itself from it.
11609                  */
11610                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11611                 len = chk->send_size;
11612         } else {
11613                 /* no truncation needed */
11614                 drp->ch.chunk_flags = 0;
11615                 drp->trunc_len = htons(0);
11616         }
11617         if (bad_crc) {
11618                 drp->ch.chunk_flags |= SCTP_BADCRC;
11619         }
11620         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11621         SCTP_BUF_LEN(chk->data) = chk->send_size;
11622         chk->sent = SCTP_DATAGRAM_UNSENT;
11623         chk->snd_count = 0;
11624         if (net) {
11625                 /* we should hit here */
11626                 chk->whoTo = net;
11627                 atomic_add_int(&chk->whoTo->ref_count, 1);
11628         } else {
11629                 chk->whoTo = NULL;
11630         }
11631         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11632         drp->ch.chunk_length = htons(chk->send_size);
11633         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11634         if (spc < 0) {
11635                 spc = 0;
11636         }
11637         drp->bottle_bw = htonl(spc);
11638         if (asoc->my_rwnd) {
11639                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11640                     asoc->size_on_all_streams +
11641                     asoc->my_rwnd_control_len +
11642                     stcb->sctp_socket->so_rcv.sb_cc);
11643         } else {
11644                 /*-
11645                  * If my rwnd is 0, possibly from mbuf depletion as well as
11646                  * space used, tell the peer there is NO space aka onq == bw
11647                  */
11648                 drp->current_onq = htonl(spc);
11649         }
11650         drp->reserved = 0;
11651         datap = drp->data;
11652         m_copydata(m, iphlen, len, (caddr_t)datap);
11653         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11654         asoc->ctrl_queue_cnt++;
11655 }
11656 
11657 void
11658 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11659 {
11660         struct sctp_association *asoc;
11661         struct sctp_cwr_chunk *cwr;
11662         struct sctp_tmit_chunk *chk;
11663 
11664         SCTP_TCB_LOCK_ASSERT(stcb);
11665         if (net == NULL) {
11666                 return;
11667         }
11668         asoc = &stcb->asoc;
11669         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11670                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11671                         /*
11672                          * found a previous CWR queued to same destination
11673                          * update it if needed
11674                          */
11675                         uint32_t ctsn;
11676 
11677                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11678                         ctsn = ntohl(cwr->tsn);
11679                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11680                                 cwr->tsn = htonl(high_tsn);
11681                         }
11682                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11683                                 /* Make sure override is carried */
11684                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11685                         }
11686                         return;
11687                 }
11688         }
11689         sctp_alloc_a_chunk(stcb, chk);
11690         if (chk == NULL) {
11691                 return;
11692         }
11693         chk->copy_by_ref = 0;
11694         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11695         chk->rec.chunk_id.can_take_data = 1;
11696         chk->flags = 0;
11697         chk->asoc = &stcb->asoc;
11698         chk->send_size = sizeof(struct sctp_cwr_chunk);
11699         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11700         if (chk->data == NULL) {
11701                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11702                 return;
11703         }
11704         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11705         SCTP_BUF_LEN(chk->data) = chk->send_size;
11706         chk->sent = SCTP_DATAGRAM_UNSENT;
11707         chk->snd_count = 0;
11708         chk->whoTo = net;
11709         atomic_add_int(&chk->whoTo->ref_count, 1);
11710         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11711         cwr->ch.chunk_type = SCTP_ECN_CWR;
11712         cwr->ch.chunk_flags = override;
11713         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11714         cwr->tsn = htonl(high_tsn);
11715         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11716         asoc->ctrl_queue_cnt++;
11717 }
11718 
11719 static int
11720 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11721     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11722 {
11723         uint16_t len, old_len, i;
11724         struct sctp_stream_reset_out_request *req_out;
11725         struct sctp_chunkhdr *ch;
11726         int at;
11727         int number_entries = 0;
11728 
11729         ch = mtod(chk->data, struct sctp_chunkhdr *);
11730         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11731         /* get to new offset for the param. */
11732         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11733         /* now how long will this param be? */
11734         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11735                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11736                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11737                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11738                         number_entries++;
11739                 }
11740         }
11741         if (number_entries == 0) {
11742                 return (0);
11743         }
11744         if (number_entries == stcb->asoc.streamoutcnt) {
11745                 number_entries = 0;
11746         }
11747         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11748                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11749         }
11750         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11751         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11752         req_out->ph.param_length = htons(len);
11753         req_out->request_seq = htonl(seq);
11754         req_out->response_seq = htonl(resp_seq);
11755         req_out->send_reset_at_tsn = htonl(last_sent);
11756         at = 0;
11757         if (number_entries) {
11758                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11759                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11760                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11761                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11762                                 req_out->list_of_streams[at] = htons(i);
11763                                 at++;
11764                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11765                                 if (at >= number_entries) {
11766                                         break;
11767                                 }
11768                         }
11769                 }
11770         } else {
11771                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11772                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11773                 }
11774         }
11775         if (SCTP_SIZE32(len) > len) {
11776                 /*-
11777                  * Need to worry about the pad we may end up adding to the
11778                  * end. This is easy since the struct is either aligned to 4
11779                  * bytes or 2 bytes off.
11780                  */
11781                 req_out->list_of_streams[number_entries] = 0;
11782         }
11783         /* now fix the chunk length */
11784         ch->chunk_length = htons(len + old_len);
11785         chk->book_size = len + old_len;
11786         chk->book_size_scale = 0;
11787         chk->send_size = SCTP_SIZE32(chk->book_size);
11788         SCTP_BUF_LEN(chk->data) = chk->send_size;
11789         return (1);
11790 }
11791 
11792 static void
11793 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11794     int number_entries, uint16_t *list,
11795     uint32_t seq)
11796 {
11797         uint16_t len, old_len, i;
11798         struct sctp_stream_reset_in_request *req_in;
11799         struct sctp_chunkhdr *ch;
11800 
11801         ch = mtod(chk->data, struct sctp_chunkhdr *);
11802         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11803 
11804         /* get to new offset for the param. */
11805         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11806         /* now how long will this param be? */
11807         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11808         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11809         req_in->ph.param_length = htons(len);
11810         req_in->request_seq = htonl(seq);
11811         if (number_entries) {
11812                 for (i = 0; i < number_entries; i++) {
11813                         req_in->list_of_streams[i] = htons(list[i]);
11814                 }
11815         }
11816         if (SCTP_SIZE32(len) > len) {
11817                 /*-
11818                  * Need to worry about the pad we may end up adding to the
11819                  * end. This is easy since the struct is either aligned to 4
11820                  * bytes or 2 bytes off.
11821                  */
11822                 req_in->list_of_streams[number_entries] = 0;
11823         }
11824         /* now fix the chunk length */
11825         ch->chunk_length = htons(len + old_len);
11826         chk->book_size = len + old_len;
11827         chk->book_size_scale = 0;
11828         chk->send_size = SCTP_SIZE32(chk->book_size);
11829         SCTP_BUF_LEN(chk->data) = chk->send_size;
11830         return;
11831 }
11832 
11833 static void
11834 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11835     uint32_t seq)
11836 {
11837         uint16_t len, old_len;
11838         struct sctp_stream_reset_tsn_request *req_tsn;
11839         struct sctp_chunkhdr *ch;
11840 
11841         ch = mtod(chk->data, struct sctp_chunkhdr *);
11842         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11843 
11844         /* get to new offset for the param. */
11845         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11846         /* now how long will this param be? */
11847         len = sizeof(struct sctp_stream_reset_tsn_request);
11848         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11849         req_tsn->ph.param_length = htons(len);
11850         req_tsn->request_seq = htonl(seq);
11851 
11852         /* now fix the chunk length */
11853         ch->chunk_length = htons(len + old_len);
11854         chk->send_size = len + old_len;
11855         chk->book_size = SCTP_SIZE32(chk->send_size);
11856         chk->book_size_scale = 0;
11857         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11858         return;
11859 }
11860 
11861 void
11862 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11863     uint32_t resp_seq, uint32_t result)
11864 {
11865         uint16_t len, old_len;
11866         struct sctp_stream_reset_response *resp;
11867         struct sctp_chunkhdr *ch;
11868 
11869         ch = mtod(chk->data, struct sctp_chunkhdr *);
11870         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11871 
11872         /* get to new offset for the param. */
11873         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11874         /* now how long will this param be? */
11875         len = sizeof(struct sctp_stream_reset_response);
11876         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11877         resp->ph.param_length = htons(len);
11878         resp->response_seq = htonl(resp_seq);
11879         resp->result = ntohl(result);
11880 
11881         /* now fix the chunk length */
11882         ch->chunk_length = htons(len + old_len);
11883         chk->book_size = len + old_len;
11884         chk->book_size_scale = 0;
11885         chk->send_size = SCTP_SIZE32(chk->book_size);
11886         SCTP_BUF_LEN(chk->data) = chk->send_size;
11887         return;
11888 }
11889 
11890 void
11891 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11892     struct sctp_stream_reset_list *ent,
11893     int response)
11894 {
11895         struct sctp_association *asoc;
11896         struct sctp_tmit_chunk *chk;
11897         struct sctp_chunkhdr *ch;
11898 
11899         asoc = &stcb->asoc;
11900 
11901         /*
11902          * Reset our last reset action to the new one IP -> response
11903          * (PERFORMED probably). This assures that if we fail to send, a
11904          * retran from the peer will get the new response.
11905          */
11906         asoc->last_reset_action[0] = response;
11907         if (asoc->stream_reset_outstanding) {
11908                 return;
11909         }
11910         sctp_alloc_a_chunk(stcb, chk);
11911         if (chk == NULL) {
11912                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11913                 return;
11914         }
11915         chk->copy_by_ref = 0;
11916         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11917         chk->rec.chunk_id.can_take_data = 0;
11918         chk->flags = 0;
11919         chk->asoc = &stcb->asoc;
11920         chk->book_size = sizeof(struct sctp_chunkhdr);
11921         chk->send_size = SCTP_SIZE32(chk->book_size);
11922         chk->book_size_scale = 0;
11923         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11924         if (chk->data == NULL) {
11925                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11926                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11927                 return;
11928         }
11929         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11930         /* setup chunk parameters */
11931         chk->sent = SCTP_DATAGRAM_UNSENT;
11932         chk->snd_count = 0;
11933         if (stcb->asoc.alternate) {
11934                 chk->whoTo = stcb->asoc.alternate;
11935         } else {
11936                 chk->whoTo = stcb->asoc.primary_destination;
11937         }
11938         ch = mtod(chk->data, struct sctp_chunkhdr *);
11939         ch->chunk_type = SCTP_STREAM_RESET;
11940         ch->chunk_flags = 0;
11941         ch->chunk_length = htons(chk->book_size);
11942         atomic_add_int(&chk->whoTo->ref_count, 1);
11943         SCTP_BUF_LEN(chk->data) = chk->send_size;
11944         sctp_add_stream_reset_result(chk, ent->seq, response);
11945         /* insert the chunk for sending */
11946         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11947             chk,
11948             sctp_next);
11949         asoc->ctrl_queue_cnt++;
11950 }
11951 
11952 void
11953 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11954     uint32_t resp_seq, uint32_t result,
11955     uint32_t send_una, uint32_t recv_next)
11956 {
11957         uint16_t len, old_len;
11958         struct sctp_stream_reset_response_tsn *resp;
11959         struct sctp_chunkhdr *ch;
11960 
11961         ch = mtod(chk->data, struct sctp_chunkhdr *);
11962         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11963 
11964         /* get to new offset for the param. */
11965         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11966         /* now how long will this param be? */
11967         len = sizeof(struct sctp_stream_reset_response_tsn);
11968         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11969         resp->ph.param_length = htons(len);
11970         resp->response_seq = htonl(resp_seq);
11971         resp->result = htonl(result);
11972         resp->senders_next_tsn = htonl(send_una);
11973         resp->receivers_next_tsn = htonl(recv_next);
11974 
11975         /* now fix the chunk length */
11976         ch->chunk_length = htons(len + old_len);
11977         chk->book_size = len + old_len;
11978         chk->send_size = SCTP_SIZE32(chk->book_size);
11979         chk->book_size_scale = 0;
11980         SCTP_BUF_LEN(chk->data) = chk->send_size;
11981         return;
11982 }
11983 
11984 static void
11985 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11986     uint32_t seq,
11987     uint16_t adding)
11988 {
11989         uint16_t len, old_len;
11990         struct sctp_chunkhdr *ch;
11991         struct sctp_stream_reset_add_strm *addstr;
11992 
11993         ch = mtod(chk->data, struct sctp_chunkhdr *);
11994         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11995 
11996         /* get to new offset for the param. */
11997         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11998         /* now how long will this param be? */
11999         len = sizeof(struct sctp_stream_reset_add_strm);
12000 
12001         /* Fill it out. */
12002         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
12003         addstr->ph.param_length = htons(len);
12004         addstr->request_seq = htonl(seq);
12005         addstr->number_of_streams = htons(adding);
12006         addstr->reserved = 0;
12007 
12008         /* now fix the chunk length */
12009         ch->chunk_length = htons(len + old_len);
12010         chk->send_size = len + old_len;
12011         chk->book_size = SCTP_SIZE32(chk->send_size);
12012         chk->book_size_scale = 0;
12013         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12014         return;
12015 }
12016 
12017 static void
12018 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
12019     uint32_t seq,
12020     uint16_t adding)
12021 {
12022         uint16_t len, old_len;
12023         struct sctp_chunkhdr *ch;
12024         struct sctp_stream_reset_add_strm *addstr;
12025 
12026         ch = mtod(chk->data, struct sctp_chunkhdr *);
12027         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
12028 
12029         /* get to new offset for the param. */
12030         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
12031         /* now how long will this param be? */
12032         len = sizeof(struct sctp_stream_reset_add_strm);
12033         /* Fill it out. */
12034         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
12035         addstr->ph.param_length = htons(len);
12036         addstr->request_seq = htonl(seq);
12037         addstr->number_of_streams = htons(adding);
12038         addstr->reserved = 0;
12039 
12040         /* now fix the chunk length */
12041         ch->chunk_length = htons(len + old_len);
12042         chk->send_size = len + old_len;
12043         chk->book_size = SCTP_SIZE32(chk->send_size);
12044         chk->book_size_scale = 0;
12045         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
12046         return;
12047 }
12048 
12049 int
12050 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
12051 {
12052         struct sctp_association *asoc;
12053         struct sctp_tmit_chunk *chk;
12054         struct sctp_chunkhdr *ch;
12055         uint32_t seq;
12056 
12057         asoc = &stcb->asoc;
12058         asoc->trigger_reset = 0;
12059         if (asoc->stream_reset_outstanding) {
12060                 return (EALREADY);
12061         }
12062         sctp_alloc_a_chunk(stcb, chk);
12063         if (chk == NULL) {
12064                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12065                 return (ENOMEM);
12066         }
12067         chk->copy_by_ref = 0;
12068         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12069         chk->rec.chunk_id.can_take_data = 0;
12070         chk->flags = 0;
12071         chk->asoc = &stcb->asoc;
12072         chk->book_size = sizeof(struct sctp_chunkhdr);
12073         chk->send_size = SCTP_SIZE32(chk->book_size);
12074         chk->book_size_scale = 0;
12075         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12076         if (chk->data == NULL) {
12077                 sctp_free_a_chunk(stcb, chk, so_locked);
12078                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12079                 return (ENOMEM);
12080         }
12081         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12082 
12083         /* setup chunk parameters */
12084         chk->sent = SCTP_DATAGRAM_UNSENT;
12085         chk->snd_count = 0;
12086         if (stcb->asoc.alternate) {
12087                 chk->whoTo = stcb->asoc.alternate;
12088         } else {
12089                 chk->whoTo = stcb->asoc.primary_destination;
12090         }
12091         ch = mtod(chk->data, struct sctp_chunkhdr *);
12092         ch->chunk_type = SCTP_STREAM_RESET;
12093         ch->chunk_flags = 0;
12094         ch->chunk_length = htons(chk->book_size);
12095         atomic_add_int(&chk->whoTo->ref_count, 1);
12096         SCTP_BUF_LEN(chk->data) = chk->send_size;
12097         seq = stcb->asoc.str_reset_seq_out;
12098         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
12099                 seq++;
12100                 asoc->stream_reset_outstanding++;
12101         } else {
12102                 m_freem(chk->data);
12103                 chk->data = NULL;
12104                 sctp_free_a_chunk(stcb, chk, so_locked);
12105                 return (ENOENT);
12106         }
12107         asoc->str_reset = chk;
12108         /* insert the chunk for sending */
12109         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12110             chk,
12111             sctp_next);
12112         asoc->ctrl_queue_cnt++;
12113 
12114         if (stcb->asoc.send_sack) {
12115                 sctp_send_sack(stcb, so_locked);
12116         }
12117         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12118         return (0);
12119 }
12120 
12121 int
12122 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12123     uint16_t number_entries, uint16_t *list,
12124     uint8_t send_in_req,
12125     uint8_t send_tsn_req,
12126     uint8_t add_stream,
12127     uint16_t adding_o,
12128     uint16_t adding_i, uint8_t peer_asked)
12129 {
12130         struct sctp_association *asoc;
12131         struct sctp_tmit_chunk *chk;
12132         struct sctp_chunkhdr *ch;
12133         int can_send_out_req = 0;
12134         uint32_t seq;
12135 
12136         asoc = &stcb->asoc;
12137         if (asoc->stream_reset_outstanding) {
12138                 /*-
12139                  * Already one pending, must get ACK back to clear the flag.
12140                  */
12141                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12142                 return (EBUSY);
12143         }
12144         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12145             (add_stream == 0)) {
12146                 /* nothing to do */
12147                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12148                 return (EINVAL);
12149         }
12150         if (send_tsn_req && send_in_req) {
12151                 /* error, can't do that */
12152                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12153                 return (EINVAL);
12154         } else if (send_in_req) {
12155                 can_send_out_req = 1;
12156         }
12157         if (number_entries > (MCLBYTES -
12158             SCTP_MIN_OVERHEAD -
12159             sizeof(struct sctp_chunkhdr) -
12160             sizeof(struct sctp_stream_reset_out_request)) /
12161             sizeof(uint16_t)) {
12162                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12163                 return (ENOMEM);
12164         }
12165         sctp_alloc_a_chunk(stcb, chk);
12166         if (chk == NULL) {
12167                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12168                 return (ENOMEM);
12169         }
12170         chk->copy_by_ref = 0;
12171         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12172         chk->rec.chunk_id.can_take_data = 0;
12173         chk->flags = 0;
12174         chk->asoc = &stcb->asoc;
12175         chk->book_size = sizeof(struct sctp_chunkhdr);
12176         chk->send_size = SCTP_SIZE32(chk->book_size);
12177         chk->book_size_scale = 0;
12178 
12179         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12180         if (chk->data == NULL) {
12181                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12182                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12183                 return (ENOMEM);
12184         }
12185         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12186 
12187         /* setup chunk parameters */
12188         chk->sent = SCTP_DATAGRAM_UNSENT;
12189         chk->snd_count = 0;
12190         if (stcb->asoc.alternate) {
12191                 chk->whoTo = stcb->asoc.alternate;
12192         } else {
12193                 chk->whoTo = stcb->asoc.primary_destination;
12194         }
12195         atomic_add_int(&chk->whoTo->ref_count, 1);
12196         ch = mtod(chk->data, struct sctp_chunkhdr *);
12197         ch->chunk_type = SCTP_STREAM_RESET;
12198         ch->chunk_flags = 0;
12199         ch->chunk_length = htons(chk->book_size);
12200         SCTP_BUF_LEN(chk->data) = chk->send_size;
12201 
12202         seq = stcb->asoc.str_reset_seq_out;
12203         if (can_send_out_req) {
12204                 int ret;
12205 
12206                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12207                 if (ret) {
12208                         seq++;
12209                         asoc->stream_reset_outstanding++;
12210                 }
12211         }
12212         if ((add_stream & 1) &&
12213             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12214                 /* Need to allocate more */
12215                 struct sctp_stream_out *oldstream;
12216                 struct sctp_stream_queue_pending *sp, *nsp;
12217                 int i;
12218 #if defined(SCTP_DETAILED_STR_STATS)
12219                 int j;
12220 #endif
12221 
12222                 oldstream = stcb->asoc.strmout;
12223                 /* get some more */
12224                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12225                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12226                     SCTP_M_STRMO);
12227                 if (stcb->asoc.strmout == NULL) {
12228                         uint8_t x;
12229 
12230                         stcb->asoc.strmout = oldstream;
12231                         /* Turn off the bit */
12232                         x = add_stream & 0xfe;
12233                         add_stream = x;
12234                         goto skip_stuff;
12235                 }
12236                 /*
12237                  * Ok now we proceed with copying the old out stuff and
12238                  * initializing the new stuff.
12239                  */
12240                 SCTP_TCB_SEND_LOCK(stcb);
12241                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12242                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12243                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12244                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12245                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12246                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12247                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12248                         stcb->asoc.strmout[i].sid = i;
12249                         stcb->asoc.strmout[i].state = oldstream[i].state;
12250                         /* FIX ME FIX ME */
12251                         /*
12252                          * This should be a SS_COPY operation FIX ME STREAM
12253                          * SCHEDULER EXPERT
12254                          */
12255                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12256                         /* now anything on those queues? */
12257                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12258                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12259                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12260                         }
12261 
12262                 }
12263                 /* now the new streams */
12264                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12265                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12266                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12267                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12268 #if defined(SCTP_DETAILED_STR_STATS)
12269                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12270                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12271                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12272                         }
12273 #else
12274                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12275                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12276 #endif
12277                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12278                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12279                         stcb->asoc.strmout[i].sid = i;
12280                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12281                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12282                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12283                 }
12284                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12285                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12286                 SCTP_TCB_SEND_UNLOCK(stcb);
12287         }
12288 skip_stuff:
12289         if ((add_stream & 1) && (adding_o > 0)) {
12290                 asoc->strm_pending_add_size = adding_o;
12291                 asoc->peer_req_out = peer_asked;
12292                 sctp_add_an_out_stream(chk, seq, adding_o);
12293                 seq++;
12294                 asoc->stream_reset_outstanding++;
12295         }
12296         if ((add_stream & 2) && (adding_i > 0)) {
12297                 sctp_add_an_in_stream(chk, seq, adding_i);
12298                 seq++;
12299                 asoc->stream_reset_outstanding++;
12300         }
12301         if (send_in_req) {
12302                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12303                 seq++;
12304                 asoc->stream_reset_outstanding++;
12305         }
12306         if (send_tsn_req) {
12307                 sctp_add_stream_reset_tsn(chk, seq);
12308                 asoc->stream_reset_outstanding++;
12309         }
12310         asoc->str_reset = chk;
12311         /* insert the chunk for sending */
12312         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12313             chk,
12314             sctp_next);
12315         asoc->ctrl_queue_cnt++;
12316         if (stcb->asoc.send_sack) {
12317                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12318         }
12319         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12320         return (0);
12321 }
12322 
12323 void
12324 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12325     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12326     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12327     uint32_t vrf_id, uint16_t port)
12328 {
12329         /* Don't respond to an ABORT with an ABORT. */
12330         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12331                 if (cause)
12332                         sctp_m_freem(cause);
12333                 return;
12334         }
12335         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12336             mflowtype, mflowid, fibnum,
12337             vrf_id, port);
12338         return;
12339 }
12340 
12341 void
12342 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12343     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12344     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12345     uint32_t vrf_id, uint16_t port)
12346 {
12347         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12348             mflowtype, mflowid, fibnum,
12349             vrf_id, port);
12350         return;
12351 }
12352 
12353 static struct mbuf *
12354 sctp_copy_resume(struct uio *uio,
12355     int max_send_len,
12356     int user_marks_eor,
12357     int *error,
12358     uint32_t *sndout,
12359     struct mbuf **new_tail)
12360 {
12361         struct mbuf *m;
12362 
12363         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12364             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12365         if (m == NULL) {
12366                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12367                 *error = ENOBUFS;
12368         } else {
12369                 *sndout = m_length(m, NULL);
12370                 *new_tail = m_last(m);
12371         }
12372         return (m);
12373 }
12374 
12375 static int
12376 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12377     struct uio *uio,
12378     int resv_upfront)
12379 {
12380         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12381             resv_upfront, 0);
12382         if (sp->data == NULL) {
12383                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12384                 return (ENOBUFS);
12385         }
12386         sp->tail_mbuf = m_last(sp->data);
12387         return (0);
12388 }
12389 
12390 
12391 
12392 static struct sctp_stream_queue_pending *
12393 sctp_copy_it_in(struct sctp_tcb *stcb,
12394     struct sctp_association *asoc,
12395     struct sctp_sndrcvinfo *srcv,
12396     struct uio *uio,
12397     struct sctp_nets *net,
12398     int max_send_len,
12399     int user_marks_eor,
12400     int *error)
12401 {
12402         /*-
12403          * This routine must be very careful in its work. Protocol
12404          * processing is up and running so care must be taken to spl...()
12405          * when you need to do something that may effect the stcb/asoc. The
12406          * sb is locked however. When data is copied the protocol processing
12407          * should be enabled since this is a slower operation...
12408          */
12409         struct sctp_stream_queue_pending *sp = NULL;
12410         int resv_in_first;
12411 
12412         *error = 0;
12413         /* Now can we send this? */
12414         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12415             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12416             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12417             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12418                 /* got data while shutting down */
12419                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12420                 *error = ECONNRESET;
12421                 goto out_now;
12422         }
12423         sctp_alloc_a_strmoq(stcb, sp);
12424         if (sp == NULL) {
12425                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12426                 *error = ENOMEM;
12427                 goto out_now;
12428         }
12429         sp->act_flags = 0;
12430         sp->sender_all_done = 0;
12431         sp->sinfo_flags = srcv->sinfo_flags;
12432         sp->timetolive = srcv->sinfo_timetolive;
12433         sp->ppid = srcv->sinfo_ppid;
12434         sp->context = srcv->sinfo_context;
12435         sp->fsn = 0;
12436         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12437 
12438         sp->sid = srcv->sinfo_stream;
12439         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12440         if ((sp->length == (uint32_t)uio->uio_resid) &&
12441             ((user_marks_eor == 0) ||
12442             (srcv->sinfo_flags & SCTP_EOF) ||
12443             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12444                 sp->msg_is_complete = 1;
12445         } else {
12446                 sp->msg_is_complete = 0;
12447         }
12448         sp->sender_all_done = 0;
12449         sp->some_taken = 0;
12450         sp->put_last_out = 0;
12451         resv_in_first = sizeof(struct sctp_data_chunk);
12452         sp->data = sp->tail_mbuf = NULL;
12453         if (sp->length == 0) {
12454                 *error = 0;
12455                 goto skip_copy;
12456         }
12457         if (srcv->sinfo_keynumber_valid) {
12458                 sp->auth_keyid = srcv->sinfo_keynumber;
12459         } else {
12460                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12461         }
12462         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12463                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12464                 sp->holds_key_ref = 1;
12465         }
12466         *error = sctp_copy_one(sp, uio, resv_in_first);
12467 skip_copy:
12468         if (*error) {
12469                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12470                 sp = NULL;
12471         } else {
12472                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12473                         sp->net = net;
12474                         atomic_add_int(&sp->net->ref_count, 1);
12475                 } else {
12476                         sp->net = NULL;
12477                 }
12478                 sctp_set_prsctp_policy(sp);
12479         }
12480 out_now:
12481         return (sp);
12482 }
12483 
12484 
12485 int
12486 sctp_sosend(struct socket *so,
12487     struct sockaddr *addr,
12488     struct uio *uio,
12489     struct mbuf *top,
12490     struct mbuf *control,
12491     int flags,
12492     struct thread *p
12493 )
12494 {
12495         int error, use_sndinfo = 0;
12496         struct sctp_sndrcvinfo sndrcvninfo;
12497         struct sockaddr *addr_to_use;
12498 #if defined(INET) && defined(INET6)
12499         struct sockaddr_in sin;
12500 #endif
12501 
12502         if (control) {
12503                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12504                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12505                     sizeof(sndrcvninfo))) {
12506                         /* got one */
12507                         use_sndinfo = 1;
12508                 }
12509         }
12510         addr_to_use = addr;
12511 #if defined(INET) && defined(INET6)
12512         if ((addr) && (addr->sa_family == AF_INET6)) {
12513                 struct sockaddr_in6 *sin6;
12514 
12515                 sin6 = (struct sockaddr_in6 *)addr;
12516                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12517                         in6_sin6_2_sin(&sin, sin6);
12518                         addr_to_use = (struct sockaddr *)&sin;
12519                 }
12520         }
12521 #endif
12522         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12523             control,
12524             flags,
12525             use_sndinfo ? &sndrcvninfo : NULL
12526             ,p
12527             );
12528         return (error);
12529 }
12530 
12531 
12532 int
12533 sctp_lower_sosend(struct socket *so,
12534     struct sockaddr *addr,
12535     struct uio *uio,
12536     struct mbuf *i_pak,
12537     struct mbuf *control,
12538     int flags,
12539     struct sctp_sndrcvinfo *srcv
12540     ,
12541     struct thread *p
12542 )
12543 {
12544         unsigned int sndlen = 0, max_len;
12545         int error, len;
12546         struct mbuf *top = NULL;
12547         int queue_only = 0, queue_only_for_init = 0;
12548         int free_cnt_applied = 0;
12549         int un_sent;
12550         int now_filled = 0;
12551         unsigned int inqueue_bytes = 0;
12552         struct sctp_block_entry be;
12553         struct sctp_inpcb *inp;
12554         struct sctp_tcb *stcb = NULL;
12555         struct timeval now;
12556         struct sctp_nets *net;
12557         struct sctp_association *asoc;
12558         struct sctp_inpcb *t_inp;
12559         int user_marks_eor;
12560         int create_lock_applied = 0;
12561         int nagle_applies = 0;
12562         int some_on_control = 0;
12563         int got_all_of_the_send = 0;
12564         int hold_tcblock = 0;
12565         int non_blocking = 0;
12566         uint32_t local_add_more, local_soresv = 0;
12567         uint16_t port;
12568         uint16_t sinfo_flags;
12569         sctp_assoc_t sinfo_assoc_id;
12570 
12571         error = 0;
12572         net = NULL;
12573         stcb = NULL;
12574         asoc = NULL;
12575 
12576         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12577         if (inp == NULL) {
12578                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12579                 error = EINVAL;
12580                 if (i_pak) {
12581                         SCTP_RELEASE_PKT(i_pak);
12582                 }
12583                 return (error);
12584         }
12585         if ((uio == NULL) && (i_pak == NULL)) {
12586                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12587                 return (EINVAL);
12588         }
12589         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12590         atomic_add_int(&inp->total_sends, 1);
12591         if (uio) {
12592                 if (uio->uio_resid < 0) {
12593                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12594                         return (EINVAL);
12595                 }
12596                 sndlen = (unsigned int)uio->uio_resid;
12597         } else {
12598                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12599                 sndlen = SCTP_HEADER_LEN(i_pak);
12600         }
12601         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12602             (void *)addr,
12603             sndlen);
12604         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12605             (inp->sctp_socket->so_qlimit)) {
12606                 /* The listener can NOT send */
12607                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12608                 error = ENOTCONN;
12609                 goto out_unlocked;
12610         }
12611         /**
12612          * Pre-screen address, if one is given the sin-len
12613          * must be set correctly!
12614          */
12615         if (addr) {
12616                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12617 
12618                 switch (raddr->sa.sa_family) {
12619 #ifdef INET
12620                 case AF_INET:
12621                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12622                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12623                                 error = EINVAL;
12624                                 goto out_unlocked;
12625                         }
12626                         port = raddr->sin.sin_port;
12627                         break;
12628 #endif
12629 #ifdef INET6
12630                 case AF_INET6:
12631                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12632                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12633                                 error = EINVAL;
12634                                 goto out_unlocked;
12635                         }
12636                         port = raddr->sin6.sin6_port;
12637                         break;
12638 #endif
12639                 default:
12640                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12641                         error = EAFNOSUPPORT;
12642                         goto out_unlocked;
12643                 }
12644         } else
12645                 port = 0;
12646 
12647         if (srcv) {
12648                 sinfo_flags = srcv->sinfo_flags;
12649                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12650                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12651                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12652                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12653                         error = EINVAL;
12654                         goto out_unlocked;
12655                 }
12656                 if (srcv->sinfo_flags)
12657                         SCTP_STAT_INCR(sctps_sends_with_flags);
12658         } else {
12659                 sinfo_flags = inp->def_send.sinfo_flags;
12660                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12661         }
12662         if (sinfo_flags & SCTP_SENDALL) {
12663                 /* its a sendall */
12664                 error = sctp_sendall(inp, uio, top, srcv);
12665                 top = NULL;
12666                 goto out_unlocked;
12667         }
12668         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12669                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12670                 error = EINVAL;
12671                 goto out_unlocked;
12672         }
12673         /* now we must find the assoc */
12674         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12675             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12676                 SCTP_INP_RLOCK(inp);
12677                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12678                 if (stcb) {
12679                         SCTP_TCB_LOCK(stcb);
12680                         hold_tcblock = 1;
12681                 }
12682                 SCTP_INP_RUNLOCK(inp);
12683         } else if (sinfo_assoc_id) {
12684                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 1);
12685                 if (stcb != NULL) {
12686                         hold_tcblock = 1;
12687                 }
12688         } else if (addr) {
12689                 /*-
12690                  * Since we did not use findep we must
12691                  * increment it, and if we don't find a tcb
12692                  * decrement it.
12693                  */
12694                 SCTP_INP_WLOCK(inp);
12695                 SCTP_INP_INCR_REF(inp);
12696                 SCTP_INP_WUNLOCK(inp);
12697                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12698                 if (stcb == NULL) {
12699                         SCTP_INP_WLOCK(inp);
12700                         SCTP_INP_DECR_REF(inp);
12701                         SCTP_INP_WUNLOCK(inp);
12702                 } else {
12703                         hold_tcblock = 1;
12704                 }
12705         }
12706         if ((stcb == NULL) && (addr)) {
12707                 /* Possible implicit send? */
12708                 SCTP_ASOC_CREATE_LOCK(inp);
12709                 create_lock_applied = 1;
12710                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12711                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12712                         /* Should I really unlock ? */
12713                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12714                         error = EINVAL;
12715                         goto out_unlocked;
12716 
12717                 }
12718                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12719                     (addr->sa_family == AF_INET6)) {
12720                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12721                         error = EINVAL;
12722                         goto out_unlocked;
12723                 }
12724                 SCTP_INP_WLOCK(inp);
12725                 SCTP_INP_INCR_REF(inp);
12726                 SCTP_INP_WUNLOCK(inp);
12727                 /* With the lock applied look again */
12728                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12729                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12730                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12731                 }
12732                 if (stcb == NULL) {
12733                         SCTP_INP_WLOCK(inp);
12734                         SCTP_INP_DECR_REF(inp);
12735                         SCTP_INP_WUNLOCK(inp);
12736                 } else {
12737                         hold_tcblock = 1;
12738                 }
12739                 if (error) {
12740                         goto out_unlocked;
12741                 }
12742                 if (t_inp != inp) {
12743                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12744                         error = ENOTCONN;
12745                         goto out_unlocked;
12746                 }
12747         }
12748         if (stcb == NULL) {
12749                 if (addr == NULL) {
12750                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12751                         error = ENOENT;
12752                         goto out_unlocked;
12753                 } else {
12754                         /* We must go ahead and start the INIT process */
12755                         uint32_t vrf_id;
12756 
12757                         if ((sinfo_flags & SCTP_ABORT) ||
12758                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12759                                 /*-
12760                                  * User asks to abort a non-existant assoc,
12761                                  * or EOF a non-existant assoc with no data
12762                                  */
12763                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12764                                 error = ENOENT;
12765                                 goto out_unlocked;
12766                         }
12767                         /* get an asoc/stcb struct */
12768                         vrf_id = inp->def_vrf_id;
12769 #ifdef INVARIANTS
12770                         if (create_lock_applied == 0) {
12771                                 panic("Error, should hold create lock and I don't?");
12772                         }
12773 #endif
12774                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12775                             inp->sctp_ep.pre_open_stream_count,
12776                             inp->sctp_ep.port,
12777                             p);
12778                         if (stcb == NULL) {
12779                                 /* Error is setup for us in the call */
12780                                 goto out_unlocked;
12781                         }
12782                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12783                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12784                                 /*
12785                                  * Set the connected flag so we can queue
12786                                  * data
12787                                  */
12788                                 soisconnecting(so);
12789                         }
12790                         hold_tcblock = 1;
12791                         if (create_lock_applied) {
12792                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12793                                 create_lock_applied = 0;
12794                         } else {
12795                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12796                         }
12797                         /*
12798                          * Turn on queue only flag to prevent data from
12799                          * being sent
12800                          */
12801                         queue_only = 1;
12802                         asoc = &stcb->asoc;
12803                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12804                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12805 
12806                         /* initialize authentication params for the assoc */
12807                         sctp_initialize_auth_params(inp, stcb);
12808 
12809                         if (control) {
12810                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12811                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12812                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12813                                         hold_tcblock = 0;
12814                                         stcb = NULL;
12815                                         goto out_unlocked;
12816                                 }
12817                         }
12818                         /* out with the INIT */
12819                         queue_only_for_init = 1;
12820                         /*-
12821                          * we may want to dig in after this call and adjust the MTU
12822                          * value. It defaulted to 1500 (constant) but the ro
12823                          * structure may now have an update and thus we may need to
12824                          * change it BEFORE we append the message.
12825                          */
12826                 }
12827         } else
12828                 asoc = &stcb->asoc;
12829         if (srcv == NULL)
12830                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12831         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12832                 if (addr)
12833                         net = sctp_findnet(stcb, addr);
12834                 else
12835                         net = NULL;
12836                 if ((net == NULL) ||
12837                     ((port != 0) && (port != stcb->rport))) {
12838                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12839                         error = EINVAL;
12840                         goto out_unlocked;
12841                 }
12842         } else {
12843                 if (stcb->asoc.alternate) {
12844                         net = stcb->asoc.alternate;
12845                 } else {
12846                         net = stcb->asoc.primary_destination;
12847                 }
12848         }
12849         atomic_add_int(&stcb->total_sends, 1);
12850         /* Keep the stcb from being freed under our feet */
12851         atomic_add_int(&asoc->refcnt, 1);
12852         free_cnt_applied = 1;
12853 
12854         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12855                 if (sndlen > asoc->smallest_mtu) {
12856                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12857                         error = EMSGSIZE;
12858                         goto out_unlocked;
12859                 }
12860         }
12861         if (SCTP_SO_IS_NBIO(so)
12862             || (flags & MSG_NBIO)
12863             ) {
12864                 non_blocking = 1;
12865         }
12866         /* would we block? */
12867         if (non_blocking) {
12868                 if (hold_tcblock == 0) {
12869                         SCTP_TCB_LOCK(stcb);
12870                         hold_tcblock = 1;
12871                 }
12872                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12873                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12874                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12875                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12876                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12877                                 error = EMSGSIZE;
12878                         else
12879                                 error = EWOULDBLOCK;
12880                         goto out_unlocked;
12881                 }
12882                 stcb->asoc.sb_send_resv += sndlen;
12883                 SCTP_TCB_UNLOCK(stcb);
12884                 hold_tcblock = 0;
12885         } else {
12886                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12887         }
12888         local_soresv = sndlen;
12889         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12890                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12891                 error = ECONNRESET;
12892                 goto out_unlocked;
12893         }
12894         if (create_lock_applied) {
12895                 SCTP_ASOC_CREATE_UNLOCK(inp);
12896                 create_lock_applied = 0;
12897         }
12898         /* Is the stream no. valid? */
12899         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12900                 /* Invalid stream number */
12901                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12902                 error = EINVAL;
12903                 goto out_unlocked;
12904         }
12905         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12906             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12907                 /*
12908                  * Can't queue any data while stream reset is underway.
12909                  */
12910                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12911                         error = EAGAIN;
12912                 } else {
12913                         error = EINVAL;
12914                 }
12915                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12916                 goto out_unlocked;
12917         }
12918         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12919             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12920                 queue_only = 1;
12921         }
12922         /* we are now done with all control */
12923         if (control) {
12924                 sctp_m_freem(control);
12925                 control = NULL;
12926         }
12927         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12928             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12929             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12930             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12931                 if (srcv->sinfo_flags & SCTP_ABORT) {
12932                         ;
12933                 } else {
12934                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12935                         error = ECONNRESET;
12936                         goto out_unlocked;
12937                 }
12938         }
12939         /* Ok, we will attempt a msgsnd :> */
12940         if (p) {
12941                 p->td_ru.ru_msgsnd++;
12942         }
12943         /* Are we aborting? */
12944         if (srcv->sinfo_flags & SCTP_ABORT) {
12945                 struct mbuf *mm;
12946                 int tot_demand, tot_out = 0, max_out;
12947 
12948                 SCTP_STAT_INCR(sctps_sends_with_abort);
12949                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12950                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12951                         /* It has to be up before we abort */
12952                         /* how big is the user initiated abort? */
12953                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12954                         error = EINVAL;
12955                         goto out;
12956                 }
12957                 if (hold_tcblock) {
12958                         SCTP_TCB_UNLOCK(stcb);
12959                         hold_tcblock = 0;
12960                 }
12961                 if (top) {
12962                         struct mbuf *cntm = NULL;
12963 
12964                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12965                         if (sndlen != 0) {
12966                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12967                                         tot_out += SCTP_BUF_LEN(cntm);
12968                                 }
12969                         }
12970                 } else {
12971                         /* Must fit in a MTU */
12972                         tot_out = sndlen;
12973                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12974                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12975                                 /* To big */
12976                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12977                                 error = EMSGSIZE;
12978                                 goto out;
12979                         }
12980                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12981                 }
12982                 if (mm == NULL) {
12983                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12984                         error = ENOMEM;
12985                         goto out;
12986                 }
12987                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12988                 max_out -= sizeof(struct sctp_abort_msg);
12989                 if (tot_out > max_out) {
12990                         tot_out = max_out;
12991                 }
12992                 if (mm) {
12993                         struct sctp_paramhdr *ph;
12994 
12995                         /* now move forward the data pointer */
12996                         ph = mtod(mm, struct sctp_paramhdr *);
12997                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12998                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12999                         ph++;
13000                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
13001                         if (top == NULL) {
13002                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
13003                                 if (error) {
13004                                         /*-
13005                                          * Here if we can't get his data we
13006                                          * still abort we just don't get to
13007                                          * send the users note :-0
13008                                          */
13009                                         sctp_m_freem(mm);
13010                                         mm = NULL;
13011                                 }
13012                         } else {
13013                                 if (sndlen != 0) {
13014                                         SCTP_BUF_NEXT(mm) = top;
13015                                 }
13016                         }
13017                 }
13018                 if (hold_tcblock == 0) {
13019                         SCTP_TCB_LOCK(stcb);
13020                 }
13021                 atomic_add_int(&stcb->asoc.refcnt, -1);
13022                 free_cnt_applied = 0;
13023                 /* release this lock, otherwise we hang on ourselves */
13024                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
13025                 /* now relock the stcb so everything is sane */
13026                 hold_tcblock = 0;
13027                 stcb = NULL;
13028                 /*
13029                  * In this case top is already chained to mm avoid double
13030                  * free, since we free it below if top != NULL and driver
13031                  * would free it after sending the packet out
13032                  */
13033                 if (sndlen != 0) {
13034                         top = NULL;
13035                 }
13036                 goto out_unlocked;
13037         }
13038         /* Calculate the maximum we can send */
13039         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13040         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13041                 if (non_blocking) {
13042                         /* we already checked for non-blocking above. */
13043                         max_len = sndlen;
13044                 } else {
13045                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13046                 }
13047         } else {
13048                 max_len = 0;
13049         }
13050         if (hold_tcblock) {
13051                 SCTP_TCB_UNLOCK(stcb);
13052                 hold_tcblock = 0;
13053         }
13054         if (asoc->strmout == NULL) {
13055                 /* huh? software error */
13056                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
13057                 error = EFAULT;
13058                 goto out_unlocked;
13059         }
13060         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
13061         if ((user_marks_eor == 0) &&
13062             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
13063                 /* It will NEVER fit */
13064                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
13065                 error = EMSGSIZE;
13066                 goto out_unlocked;
13067         }
13068         if ((uio == NULL) && user_marks_eor) {
13069                 /*-
13070                  * We do not support eeor mode for
13071                  * sending with mbuf chains (like sendfile).
13072                  */
13073                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13074                 error = EINVAL;
13075                 goto out_unlocked;
13076         }
13077         if (user_marks_eor) {
13078                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
13079         } else {
13080                 /*-
13081                  * For non-eeor the whole message must fit in
13082                  * the socket send buffer.
13083                  */
13084                 local_add_more = sndlen;
13085         }
13086         len = 0;
13087         if (non_blocking) {
13088                 goto skip_preblock;
13089         }
13090         if (((max_len <= local_add_more) &&
13091             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
13092             (max_len == 0) ||
13093             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13094                 /* No room right now ! */
13095                 SOCKBUF_LOCK(&so->so_snd);
13096                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13097                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
13098                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
13099                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
13100                             (unsigned int)SCTP_SB_LIMIT_SND(so),
13101                             inqueue_bytes,
13102                             local_add_more,
13103                             stcb->asoc.stream_queue_cnt,
13104                             stcb->asoc.chunks_on_out_queue,
13105                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
13106                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13107                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13108                         }
13109                         be.error = 0;
13110                         stcb->block_entry = &be;
13111                         error = sbwait(&so->so_snd);
13112                         stcb->block_entry = NULL;
13113                         if (error || so->so_error || be.error) {
13114                                 if (error == 0) {
13115                                         if (so->so_error)
13116                                                 error = so->so_error;
13117                                         if (be.error) {
13118                                                 error = be.error;
13119                                         }
13120                                 }
13121                                 SOCKBUF_UNLOCK(&so->so_snd);
13122                                 goto out_unlocked;
13123                         }
13124                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13125                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13126                                     asoc, stcb->asoc.total_output_queue_size);
13127                         }
13128                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13129                                 SOCKBUF_UNLOCK(&so->so_snd);
13130                                 goto out_unlocked;
13131                         }
13132                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13133                 }
13134                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13135                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13136                 } else {
13137                         max_len = 0;
13138                 }
13139                 SOCKBUF_UNLOCK(&so->so_snd);
13140         }
13141 skip_preblock:
13142         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13143                 goto out_unlocked;
13144         }
13145         /*
13146          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13147          * case NOTE: uio will be null when top/mbuf is passed
13148          */
13149         if (sndlen == 0) {
13150                 if (srcv->sinfo_flags & SCTP_EOF) {
13151                         got_all_of_the_send = 1;
13152                         goto dataless_eof;
13153                 } else {
13154                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13155                         error = EINVAL;
13156                         goto out;
13157                 }
13158         }
13159         if (top == NULL) {
13160                 struct sctp_stream_queue_pending *sp;
13161                 struct sctp_stream_out *strm;
13162                 uint32_t sndout;
13163 
13164                 SCTP_TCB_SEND_LOCK(stcb);
13165                 if ((asoc->stream_locked) &&
13166                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13167                         SCTP_TCB_SEND_UNLOCK(stcb);
13168                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13169                         error = EINVAL;
13170                         goto out;
13171                 }
13172                 SCTP_TCB_SEND_UNLOCK(stcb);
13173 
13174                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13175                 if (strm->last_msg_incomplete == 0) {
13176         do_a_copy_in:
13177                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13178                         if ((sp == NULL) || (error)) {
13179                                 goto out;
13180                         }
13181                         SCTP_TCB_SEND_LOCK(stcb);
13182                         if (sp->msg_is_complete) {
13183                                 strm->last_msg_incomplete = 0;
13184                                 asoc->stream_locked = 0;
13185                         } else {
13186                                 /*
13187                                  * Just got locked to this guy in case of an
13188                                  * interrupt.
13189                                  */
13190                                 strm->last_msg_incomplete = 1;
13191                                 if (stcb->asoc.idata_supported == 0) {
13192                                         asoc->stream_locked = 1;
13193                                         asoc->stream_locked_on = srcv->sinfo_stream;
13194                                 }
13195                                 sp->sender_all_done = 0;
13196                         }
13197                         sctp_snd_sb_alloc(stcb, sp->length);
13198                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13199                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13200                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13201                         }
13202                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13203                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13204                         SCTP_TCB_SEND_UNLOCK(stcb);
13205                 } else {
13206                         SCTP_TCB_SEND_LOCK(stcb);
13207                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13208                         SCTP_TCB_SEND_UNLOCK(stcb);
13209                         if (sp == NULL) {
13210                                 /* ???? Huh ??? last msg is gone */
13211 #ifdef INVARIANTS
13212                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13213 #else
13214                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13215                                 strm->last_msg_incomplete = 0;
13216 #endif
13217                                 goto do_a_copy_in;
13218 
13219                         }
13220                 }
13221                 while (uio->uio_resid > 0) {
13222                         /* How much room do we have? */
13223                         struct mbuf *new_tail, *mm;
13224 
13225                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13226                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13227                         else
13228                                 max_len = 0;
13229 
13230                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13231                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13232                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13233                                 sndout = 0;
13234                                 new_tail = NULL;
13235                                 if (hold_tcblock) {
13236                                         SCTP_TCB_UNLOCK(stcb);
13237                                         hold_tcblock = 0;
13238                                 }
13239                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13240                                 if ((mm == NULL) || error) {
13241                                         if (mm) {
13242                                                 sctp_m_freem(mm);
13243                                         }
13244                                         goto out;
13245                                 }
13246                                 /* Update the mbuf and count */
13247                                 SCTP_TCB_SEND_LOCK(stcb);
13248                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13249                                         /*
13250                                          * we need to get out. Peer probably
13251                                          * aborted.
13252                                          */
13253                                         sctp_m_freem(mm);
13254                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13255                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13256                                                 error = ECONNRESET;
13257                                         }
13258                                         SCTP_TCB_SEND_UNLOCK(stcb);
13259                                         goto out;
13260                                 }
13261                                 if (sp->tail_mbuf) {
13262                                         /* tack it to the end */
13263                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13264                                         sp->tail_mbuf = new_tail;
13265                                 } else {
13266                                         /* A stolen mbuf */
13267                                         sp->data = mm;
13268                                         sp->tail_mbuf = new_tail;
13269                                 }
13270                                 sctp_snd_sb_alloc(stcb, sndout);
13271                                 atomic_add_int(&sp->length, sndout);
13272                                 len += sndout;
13273                                 if (srcv->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13274                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13275                                 }
13276                                 /* Did we reach EOR? */
13277                                 if ((uio->uio_resid == 0) &&
13278                                     ((user_marks_eor == 0) ||
13279                                     (srcv->sinfo_flags & SCTP_EOF) ||
13280                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13281                                         sp->msg_is_complete = 1;
13282                                 } else {
13283                                         sp->msg_is_complete = 0;
13284                                 }
13285                                 SCTP_TCB_SEND_UNLOCK(stcb);
13286                         }
13287                         if (uio->uio_resid == 0) {
13288                                 /* got it all? */
13289                                 continue;
13290                         }
13291                         /* PR-SCTP? */
13292                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13293                                 /*
13294                                  * This is ugly but we must assure locking
13295                                  * order
13296                                  */
13297                                 if (hold_tcblock == 0) {
13298                                         SCTP_TCB_LOCK(stcb);
13299                                         hold_tcblock = 1;
13300                                 }
13301                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13302                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13303                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13304                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13305                                 else
13306                                         max_len = 0;
13307                                 if (max_len > 0) {
13308                                         continue;
13309                                 }
13310                                 SCTP_TCB_UNLOCK(stcb);
13311                                 hold_tcblock = 0;
13312                         }
13313                         /* wait for space now */
13314                         if (non_blocking) {
13315                                 /* Non-blocking io in place out */
13316                                 goto skip_out_eof;
13317                         }
13318                         /* What about the INIT, send it maybe */
13319                         if (queue_only_for_init) {
13320                                 if (hold_tcblock == 0) {
13321                                         SCTP_TCB_LOCK(stcb);
13322                                         hold_tcblock = 1;
13323                                 }
13324                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13325                                         /* a collision took us forward? */
13326                                         queue_only = 0;
13327                                 } else {
13328                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13329                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13330                                         queue_only = 1;
13331                                 }
13332                         }
13333                         if ((net->flight_size > net->cwnd) &&
13334                             (asoc->sctp_cmt_on_off == 0)) {
13335                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13336                                 queue_only = 1;
13337                         } else if (asoc->ifp_had_enobuf) {
13338                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13339                                 if (net->flight_size > (2 * net->mtu)) {
13340                                         queue_only = 1;
13341                                 }
13342                                 asoc->ifp_had_enobuf = 0;
13343                         }
13344                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13345                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13346                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13347                             (stcb->asoc.total_flight > 0) &&
13348                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13349                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13350 
13351                                 /*-
13352                                  * Ok, Nagle is set on and we have data outstanding.
13353                                  * Don't send anything and let SACKs drive out the
13354                                  * data unless we have a "full" segment to send.
13355                                  */
13356                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13357                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13358                                 }
13359                                 SCTP_STAT_INCR(sctps_naglequeued);
13360                                 nagle_applies = 1;
13361                         } else {
13362                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13363                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13364                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13365                                 }
13366                                 SCTP_STAT_INCR(sctps_naglesent);
13367                                 nagle_applies = 0;
13368                         }
13369                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13370 
13371                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13372                                     nagle_applies, un_sent);
13373                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13374                                     stcb->asoc.total_flight,
13375                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13376                         }
13377                         if (queue_only_for_init)
13378                                 queue_only_for_init = 0;
13379                         if ((queue_only == 0) && (nagle_applies == 0)) {
13380                                 /*-
13381                                  * need to start chunk output
13382                                  * before blocking.. note that if
13383                                  * a lock is already applied, then
13384                                  * the input via the net is happening
13385                                  * and I don't need to start output :-D
13386                                  */
13387                                 if (hold_tcblock == 0) {
13388                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13389                                                 hold_tcblock = 1;
13390                                                 sctp_chunk_output(inp,
13391                                                     stcb,
13392                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13393                                         }
13394                                 } else {
13395                                         sctp_chunk_output(inp,
13396                                             stcb,
13397                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13398                                 }
13399                                 if (hold_tcblock == 1) {
13400                                         SCTP_TCB_UNLOCK(stcb);
13401                                         hold_tcblock = 0;
13402                                 }
13403                         }
13404                         SOCKBUF_LOCK(&so->so_snd);
13405                         /*-
13406                          * This is a bit strange, but I think it will
13407                          * work. The total_output_queue_size is locked and
13408                          * protected by the TCB_LOCK, which we just released.
13409                          * There is a race that can occur between releasing it
13410                          * above, and me getting the socket lock, where sacks
13411                          * come in but we have not put the SB_WAIT on the
13412                          * so_snd buffer to get the wakeup. After the LOCK
13413                          * is applied the sack_processing will also need to
13414                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13415                          * once we have the socket buffer lock if we recheck the
13416                          * size we KNOW we will get to sleep safely with the
13417                          * wakeup flag in place.
13418                          */
13419                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13420                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13421                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13422                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13423                                             asoc, (size_t)uio->uio_resid);
13424                                 }
13425                                 be.error = 0;
13426                                 stcb->block_entry = &be;
13427                                 error = sbwait(&so->so_snd);
13428                                 stcb->block_entry = NULL;
13429 
13430                                 if (error || so->so_error || be.error) {
13431                                         if (error == 0) {
13432                                                 if (so->so_error)
13433                                                         error = so->so_error;
13434                                                 if (be.error) {
13435                                                         error = be.error;
13436                                                 }
13437                                         }
13438                                         SOCKBUF_UNLOCK(&so->so_snd);
13439                                         goto out_unlocked;
13440                                 }
13441                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13442                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13443                                             asoc, stcb->asoc.total_output_queue_size);
13444                                 }
13445                         }
13446                         SOCKBUF_UNLOCK(&so->so_snd);
13447                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13448                                 goto out_unlocked;
13449                         }
13450                 }
13451                 SCTP_TCB_SEND_LOCK(stcb);
13452                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13453                         SCTP_TCB_SEND_UNLOCK(stcb);
13454                         goto out_unlocked;
13455                 }
13456                 if (sp) {
13457                         if (sp->msg_is_complete == 0) {
13458                                 strm->last_msg_incomplete = 1;
13459                                 if (stcb->asoc.idata_supported == 0) {
13460                                         asoc->stream_locked = 1;
13461                                         asoc->stream_locked_on = srcv->sinfo_stream;
13462                                 }
13463                         } else {
13464                                 sp->sender_all_done = 1;
13465                                 strm->last_msg_incomplete = 0;
13466                                 asoc->stream_locked = 0;
13467                         }
13468                 } else {
13469                         SCTP_PRINTF("Huh no sp TSNH?\n");
13470                         strm->last_msg_incomplete = 0;
13471                         asoc->stream_locked = 0;
13472                 }
13473                 SCTP_TCB_SEND_UNLOCK(stcb);
13474                 if (uio->uio_resid == 0) {
13475                         got_all_of_the_send = 1;
13476                 }
13477         } else {
13478                 /* We send in a 0, since we do NOT have any locks */
13479                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13480                 top = NULL;
13481                 if (srcv->sinfo_flags & SCTP_EOF) {
13482                         /*
13483                          * This should only happen for Panda for the mbuf
13484                          * send case, which does NOT yet support EEOR mode.
13485                          * Thus, we can just set this flag to do the proper
13486                          * EOF handling.
13487                          */
13488                         got_all_of_the_send = 1;
13489                 }
13490         }
13491         if (error) {
13492                 goto out;
13493         }
13494 dataless_eof:
13495         /* EOF thing ? */
13496         if ((srcv->sinfo_flags & SCTP_EOF) &&
13497             (got_all_of_the_send == 1)) {
13498                 SCTP_STAT_INCR(sctps_sends_with_eof);
13499                 error = 0;
13500                 if (hold_tcblock == 0) {
13501                         SCTP_TCB_LOCK(stcb);
13502                         hold_tcblock = 1;
13503                 }
13504                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13505                     TAILQ_EMPTY(&asoc->sent_queue) &&
13506                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13507                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13508                                 goto abort_anyway;
13509                         }
13510                         /* there is nothing queued to send, so I'm done... */
13511                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13512                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13513                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13514                                 struct sctp_nets *netp;
13515 
13516                                 /* only send SHUTDOWN the first time through */
13517                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13518                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13519                                 }
13520                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13521                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13522                                 sctp_stop_timers_for_shutdown(stcb);
13523                                 if (stcb->asoc.alternate) {
13524                                         netp = stcb->asoc.alternate;
13525                                 } else {
13526                                         netp = stcb->asoc.primary_destination;
13527                                 }
13528                                 sctp_send_shutdown(stcb, netp);
13529                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13530                                     netp);
13531                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13532                                     asoc->primary_destination);
13533                         }
13534                 } else {
13535                         /*-
13536                          * we still got (or just got) data to send, so set
13537                          * SHUTDOWN_PENDING
13538                          */
13539                         /*-
13540                          * XXX sockets draft says that SCTP_EOF should be
13541                          * sent with no data.  currently, we will allow user
13542                          * data to be sent first and move to
13543                          * SHUTDOWN-PENDING
13544                          */
13545                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13546                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13547                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13548                                 if (hold_tcblock == 0) {
13549                                         SCTP_TCB_LOCK(stcb);
13550                                         hold_tcblock = 1;
13551                                 }
13552                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13553                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13554                                 }
13555                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13556                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13557                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13558                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13559                                         struct mbuf *op_err;
13560                                         char msg[SCTP_DIAG_INFO_LEN];
13561 
13562                         abort_anyway:
13563                                         if (free_cnt_applied) {
13564                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13565                                                 free_cnt_applied = 0;
13566                                         }
13567                                         snprintf(msg, sizeof(msg),
13568                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13569                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13570                                             msg);
13571                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13572                                             op_err, SCTP_SO_LOCKED);
13573                                         /*
13574                                          * now relock the stcb so everything
13575                                          * is sane
13576                                          */
13577                                         hold_tcblock = 0;
13578                                         stcb = NULL;
13579                                         goto out;
13580                                 }
13581                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13582                                     asoc->primary_destination);
13583                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13584                         }
13585                 }
13586         }
13587 skip_out_eof:
13588         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13589                 some_on_control = 1;
13590         }
13591         if (queue_only_for_init) {
13592                 if (hold_tcblock == 0) {
13593                         SCTP_TCB_LOCK(stcb);
13594                         hold_tcblock = 1;
13595                 }
13596                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13597                         /* a collision took us forward? */
13598                         queue_only = 0;
13599                 } else {
13600                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13601                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13602                         queue_only = 1;
13603                 }
13604         }
13605         if ((net->flight_size > net->cwnd) &&
13606             (stcb->asoc.sctp_cmt_on_off == 0)) {
13607                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13608                 queue_only = 1;
13609         } else if (asoc->ifp_had_enobuf) {
13610                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13611                 if (net->flight_size > (2 * net->mtu)) {
13612                         queue_only = 1;
13613                 }
13614                 asoc->ifp_had_enobuf = 0;
13615         }
13616         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13617             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13618         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13619             (stcb->asoc.total_flight > 0) &&
13620             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13621             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13622                 /*-
13623                  * Ok, Nagle is set on and we have data outstanding.
13624                  * Don't send anything and let SACKs drive out the
13625                  * data unless wen have a "full" segment to send.
13626                  */
13627                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13628                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13629                 }
13630                 SCTP_STAT_INCR(sctps_naglequeued);
13631                 nagle_applies = 1;
13632         } else {
13633                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13634                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13635                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13636                 }
13637                 SCTP_STAT_INCR(sctps_naglesent);
13638                 nagle_applies = 0;
13639         }
13640         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13641                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13642                     nagle_applies, un_sent);
13643                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13644                     stcb->asoc.total_flight,
13645                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13646         }
13647         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13648                 /* we can attempt to send too. */
13649                 if (hold_tcblock == 0) {
13650                         /*
13651                          * If there is activity recv'ing sacks no need to
13652                          * send
13653                          */
13654                         if (SCTP_TCB_TRYLOCK(stcb)) {
13655                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13656                                 hold_tcblock = 1;
13657                         }
13658                 } else {
13659                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13660                 }
13661         } else if ((queue_only == 0) &&
13662                     (stcb->asoc.peers_rwnd == 0) &&
13663             (stcb->asoc.total_flight == 0)) {
13664                 /* We get to have a probe outstanding */
13665                 if (hold_tcblock == 0) {
13666                         hold_tcblock = 1;
13667                         SCTP_TCB_LOCK(stcb);
13668                 }
13669                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13670         } else if (some_on_control) {
13671                 int num_out, reason, frag_point;
13672 
13673                 /* Here we do control only */
13674                 if (hold_tcblock == 0) {
13675                         hold_tcblock = 1;
13676                         SCTP_TCB_LOCK(stcb);
13677                 }
13678                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13679                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13680                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13681         }
13682         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13683             queue_only, stcb->asoc.peers_rwnd, un_sent,
13684             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13685             stcb->asoc.total_output_queue_size, error);
13686 
13687 out:
13688 out_unlocked:
13689 
13690         if (local_soresv && stcb) {
13691                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13692         }
13693         if (create_lock_applied) {
13694                 SCTP_ASOC_CREATE_UNLOCK(inp);
13695         }
13696         if ((stcb) && hold_tcblock) {
13697                 SCTP_TCB_UNLOCK(stcb);
13698         }
13699         if (stcb && free_cnt_applied) {
13700                 atomic_add_int(&stcb->asoc.refcnt, -1);
13701         }
13702 #ifdef INVARIANTS
13703         if (stcb) {
13704                 if (mtx_owned(&stcb->tcb_mtx)) {
13705                         panic("Leaving with tcb mtx owned?");
13706                 }
13707                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13708                         panic("Leaving with tcb send mtx owned?");
13709                 }
13710         }
13711 #endif
13712         if (top) {
13713                 sctp_m_freem(top);
13714         }
13715         if (control) {
13716                 sctp_m_freem(control);
13717         }
13718         return (error);
13719 }
13720 
13721 
13722 /*
13723  * generate an AUTHentication chunk, if required
13724  */
13725 struct mbuf *
13726 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13727     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13728     struct sctp_tcb *stcb, uint8_t chunk)
13729 {
13730         struct mbuf *m_auth;
13731         struct sctp_auth_chunk *auth;
13732         int chunk_len;
13733         struct mbuf *cn;
13734 
13735         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13736             (stcb == NULL))
13737                 return (m);
13738 
13739         if (stcb->asoc.auth_supported == 0) {
13740                 return (m);
13741         }
13742         /* does the requested chunk require auth? */
13743         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13744                 return (m);
13745         }
13746         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13747         if (m_auth == NULL) {
13748                 /* no mbuf's */
13749                 return (m);
13750         }
13751         /* reserve some space if this will be the first mbuf */
13752         if (m == NULL)
13753                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13754         /* fill in the AUTH chunk details */
13755         auth = mtod(m_auth, struct sctp_auth_chunk *);
13756         bzero(auth, sizeof(*auth));
13757         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13758         auth->ch.chunk_flags = 0;
13759         chunk_len = sizeof(*auth) +
13760             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13761         auth->ch.chunk_length = htons(chunk_len);
13762         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13763         /* key id and hmac digest will be computed and filled in upon send */
13764 
13765         /* save the offset where the auth was inserted into the chain */
13766         *offset = 0;
13767         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13768                 *offset += SCTP_BUF_LEN(cn);
13769         }
13770 
13771         /* update length and return pointer to the auth chunk */
13772         SCTP_BUF_LEN(m_auth) = chunk_len;
13773         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13774         if (auth_ret != NULL)
13775                 *auth_ret = auth;
13776 
13777         return (m);
13778 }
13779 
13780 #ifdef INET6
13781 int
13782 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13783 {
13784         struct nd_prefix *pfx = NULL;
13785         struct nd_pfxrouter *pfxrtr = NULL;
13786         struct sockaddr_in6 gw6;
13787 
13788         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13789                 return (0);
13790 
13791         /* get prefix entry of address */
13792         ND6_RLOCK();
13793         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13794                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13795                         continue;
13796                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13797                     &src6->sin6_addr, &pfx->ndpr_mask))
13798                         break;
13799         }
13800         /* no prefix entry in the prefix list */
13801         if (pfx == NULL) {
13802                 ND6_RUNLOCK();
13803                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13804                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13805                 return (0);
13806         }
13807         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13808         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13809 
13810         /* search installed gateway from prefix entry */
13811         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13812                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13813                 gw6.sin6_family = AF_INET6;
13814                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13815                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13816                     sizeof(struct in6_addr));
13817                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13818                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13819                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13820                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13821                 if (sctp_cmpaddr((struct sockaddr *)&gw6, ro->ro_rt->rt_gateway)) {
13822                         ND6_RUNLOCK();
13823                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13824                         ND6_RUNLOCK();
13825                         return (1);
13826                 }
13827         }
13828         ND6_RUNLOCK();
13829         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13830         return (0);
13831 }
13832 #endif
13833 
13834 int
13835 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13836 {
13837 #ifdef INET
13838         struct sockaddr_in *sin, *mask;
13839         struct ifaddr *ifa;
13840         struct in_addr srcnetaddr, gwnetaddr;
13841 
13842         if (ro == NULL || ro->ro_rt == NULL ||
13843             sifa->address.sa.sa_family != AF_INET) {
13844                 return (0);
13845         }
13846         ifa = (struct ifaddr *)sifa->ifa;
13847         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13848         sin = &sifa->address.sin;
13849         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13850         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13851         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13852         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13853 
13854         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13855         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13856         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13857         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13858         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13859         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13860                 return (1);
13861         }
13862 #endif
13863         return (0);
13864 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_output.c

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