sctp_output.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <netinet/sctp_os.h>
   39 #include <sys/proc.h>
   40 #include <netinet/sctp_var.h>
   41 #include <netinet/sctp_sysctl.h>
   42 #include <netinet/sctp_header.h>
   43 #include <netinet/sctp_pcb.h>
   44 #include <netinet/sctputil.h>
   45 #include <netinet/sctp_output.h>
   46 #include <netinet/sctp_uio.h>
   47 #include <netinet/sctputil.h>
   48 #include <netinet/sctp_auth.h>
   49 #include <netinet/sctp_timer.h>
   50 #include <netinet/sctp_asconf.h>
   51 #include <netinet/sctp_indata.h>
   52 #include <netinet/sctp_bsd_addr.h>
   53 #include <netinet/sctp_input.h>
   54 #include <netinet/sctp_crc32.h>
   55 #include <netinet/sctp_kdtrace.h>
   56 #if defined(INET) || defined(INET6)
   57 #include <netinet/udp.h>
   58 #endif
   59 #include <netinet/udp_var.h>
   60 #include <machine/in_cksum.h>
   61 
   62 #define SCTP_MAX_GAPS_INARRAY 4
   63 struct sack_track {
   64         uint8_t right_edge;     /* mergable on the right edge */
   65         uint8_t left_edge;      /* mergable on the left edge */
   66         uint8_t num_entries;
   67         uint8_t spare;
   68         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   69 };
   70 
   71 const struct sack_track sack_array[256] = {
   72         {0, 0, 0, 0,            /* 0x00 */
   73                 {{0, 0},
   74                 {0, 0},
   75                 {0, 0},
   76                 {0, 0}
   77                 }
   78         },
   79         {1, 0, 1, 0,            /* 0x01 */
   80                 {{0, 0},
   81                 {0, 0},
   82                 {0, 0},
   83                 {0, 0}
   84                 }
   85         },
   86         {0, 0, 1, 0,            /* 0x02 */
   87                 {{1, 1},
   88                 {0, 0},
   89                 {0, 0},
   90                 {0, 0}
   91                 }
   92         },
   93         {1, 0, 1, 0,            /* 0x03 */
   94                 {{0, 1},
   95                 {0, 0},
   96                 {0, 0},
   97                 {0, 0}
   98                 }
   99         },
  100         {0, 0, 1, 0,            /* 0x04 */
  101                 {{2, 2},
  102                 {0, 0},
  103                 {0, 0},
  104                 {0, 0}
  105                 }
  106         },
  107         {1, 0, 2, 0,            /* 0x05 */
  108                 {{0, 0},
  109                 {2, 2},
  110                 {0, 0},
  111                 {0, 0}
  112                 }
  113         },
  114         {0, 0, 1, 0,            /* 0x06 */
  115                 {{1, 2},
  116                 {0, 0},
  117                 {0, 0},
  118                 {0, 0}
  119                 }
  120         },
  121         {1, 0, 1, 0,            /* 0x07 */
  122                 {{0, 2},
  123                 {0, 0},
  124                 {0, 0},
  125                 {0, 0}
  126                 }
  127         },
  128         {0, 0, 1, 0,            /* 0x08 */
  129                 {{3, 3},
  130                 {0, 0},
  131                 {0, 0},
  132                 {0, 0}
  133                 }
  134         },
  135         {1, 0, 2, 0,            /* 0x09 */
  136                 {{0, 0},
  137                 {3, 3},
  138                 {0, 0},
  139                 {0, 0}
  140                 }
  141         },
  142         {0, 0, 2, 0,            /* 0x0a */
  143                 {{1, 1},
  144                 {3, 3},
  145                 {0, 0},
  146                 {0, 0}
  147                 }
  148         },
  149         {1, 0, 2, 0,            /* 0x0b */
  150                 {{0, 1},
  151                 {3, 3},
  152                 {0, 0},
  153                 {0, 0}
  154                 }
  155         },
  156         {0, 0, 1, 0,            /* 0x0c */
  157                 {{2, 3},
  158                 {0, 0},
  159                 {0, 0},
  160                 {0, 0}
  161                 }
  162         },
  163         {1, 0, 2, 0,            /* 0x0d */
  164                 {{0, 0},
  165                 {2, 3},
  166                 {0, 0},
  167                 {0, 0}
  168                 }
  169         },
  170         {0, 0, 1, 0,            /* 0x0e */
  171                 {{1, 3},
  172                 {0, 0},
  173                 {0, 0},
  174                 {0, 0}
  175                 }
  176         },
  177         {1, 0, 1, 0,            /* 0x0f */
  178                 {{0, 3},
  179                 {0, 0},
  180                 {0, 0},
  181                 {0, 0}
  182                 }
  183         },
  184         {0, 0, 1, 0,            /* 0x10 */
  185                 {{4, 4},
  186                 {0, 0},
  187                 {0, 0},
  188                 {0, 0}
  189                 }
  190         },
  191         {1, 0, 2, 0,            /* 0x11 */
  192                 {{0, 0},
  193                 {4, 4},
  194                 {0, 0},
  195                 {0, 0}
  196                 }
  197         },
  198         {0, 0, 2, 0,            /* 0x12 */
  199                 {{1, 1},
  200                 {4, 4},
  201                 {0, 0},
  202                 {0, 0}
  203                 }
  204         },
  205         {1, 0, 2, 0,            /* 0x13 */
  206                 {{0, 1},
  207                 {4, 4},
  208                 {0, 0},
  209                 {0, 0}
  210                 }
  211         },
  212         {0, 0, 2, 0,            /* 0x14 */
  213                 {{2, 2},
  214                 {4, 4},
  215                 {0, 0},
  216                 {0, 0}
  217                 }
  218         },
  219         {1, 0, 3, 0,            /* 0x15 */
  220                 {{0, 0},
  221                 {2, 2},
  222                 {4, 4},
  223                 {0, 0}
  224                 }
  225         },
  226         {0, 0, 2, 0,            /* 0x16 */
  227                 {{1, 2},
  228                 {4, 4},
  229                 {0, 0},
  230                 {0, 0}
  231                 }
  232         },
  233         {1, 0, 2, 0,            /* 0x17 */
  234                 {{0, 2},
  235                 {4, 4},
  236                 {0, 0},
  237                 {0, 0}
  238                 }
  239         },
  240         {0, 0, 1, 0,            /* 0x18 */
  241                 {{3, 4},
  242                 {0, 0},
  243                 {0, 0},
  244                 {0, 0}
  245                 }
  246         },
  247         {1, 0, 2, 0,            /* 0x19 */
  248                 {{0, 0},
  249                 {3, 4},
  250                 {0, 0},
  251                 {0, 0}
  252                 }
  253         },
  254         {0, 0, 2, 0,            /* 0x1a */
  255                 {{1, 1},
  256                 {3, 4},
  257                 {0, 0},
  258                 {0, 0}
  259                 }
  260         },
  261         {1, 0, 2, 0,            /* 0x1b */
  262                 {{0, 1},
  263                 {3, 4},
  264                 {0, 0},
  265                 {0, 0}
  266                 }
  267         },
  268         {0, 0, 1, 0,            /* 0x1c */
  269                 {{2, 4},
  270                 {0, 0},
  271                 {0, 0},
  272                 {0, 0}
  273                 }
  274         },
  275         {1, 0, 2, 0,            /* 0x1d */
  276                 {{0, 0},
  277                 {2, 4},
  278                 {0, 0},
  279                 {0, 0}
  280                 }
  281         },
  282         {0, 0, 1, 0,            /* 0x1e */
  283                 {{1, 4},
  284                 {0, 0},
  285                 {0, 0},
  286                 {0, 0}
  287                 }
  288         },
  289         {1, 0, 1, 0,            /* 0x1f */
  290                 {{0, 4},
  291                 {0, 0},
  292                 {0, 0},
  293                 {0, 0}
  294                 }
  295         },
  296         {0, 0, 1, 0,            /* 0x20 */
  297                 {{5, 5},
  298                 {0, 0},
  299                 {0, 0},
  300                 {0, 0}
  301                 }
  302         },
  303         {1, 0, 2, 0,            /* 0x21 */
  304                 {{0, 0},
  305                 {5, 5},
  306                 {0, 0},
  307                 {0, 0}
  308                 }
  309         },
  310         {0, 0, 2, 0,            /* 0x22 */
  311                 {{1, 1},
  312                 {5, 5},
  313                 {0, 0},
  314                 {0, 0}
  315                 }
  316         },
  317         {1, 0, 2, 0,            /* 0x23 */
  318                 {{0, 1},
  319                 {5, 5},
  320                 {0, 0},
  321                 {0, 0}
  322                 }
  323         },
  324         {0, 0, 2, 0,            /* 0x24 */
  325                 {{2, 2},
  326                 {5, 5},
  327                 {0, 0},
  328                 {0, 0}
  329                 }
  330         },
  331         {1, 0, 3, 0,            /* 0x25 */
  332                 {{0, 0},
  333                 {2, 2},
  334                 {5, 5},
  335                 {0, 0}
  336                 }
  337         },
  338         {0, 0, 2, 0,            /* 0x26 */
  339                 {{1, 2},
  340                 {5, 5},
  341                 {0, 0},
  342                 {0, 0}
  343                 }
  344         },
  345         {1, 0, 2, 0,            /* 0x27 */
  346                 {{0, 2},
  347                 {5, 5},
  348                 {0, 0},
  349                 {0, 0}
  350                 }
  351         },
  352         {0, 0, 2, 0,            /* 0x28 */
  353                 {{3, 3},
  354                 {5, 5},
  355                 {0, 0},
  356                 {0, 0}
  357                 }
  358         },
  359         {1, 0, 3, 0,            /* 0x29 */
  360                 {{0, 0},
  361                 {3, 3},
  362                 {5, 5},
  363                 {0, 0}
  364                 }
  365         },
  366         {0, 0, 3, 0,            /* 0x2a */
  367                 {{1, 1},
  368                 {3, 3},
  369                 {5, 5},
  370                 {0, 0}
  371                 }
  372         },
  373         {1, 0, 3, 0,            /* 0x2b */
  374                 {{0, 1},
  375                 {3, 3},
  376                 {5, 5},
  377                 {0, 0}
  378                 }
  379         },
  380         {0, 0, 2, 0,            /* 0x2c */
  381                 {{2, 3},
  382                 {5, 5},
  383                 {0, 0},
  384                 {0, 0}
  385                 }
  386         },
  387         {1, 0, 3, 0,            /* 0x2d */
  388                 {{0, 0},
  389                 {2, 3},
  390                 {5, 5},
  391                 {0, 0}
  392                 }
  393         },
  394         {0, 0, 2, 0,            /* 0x2e */
  395                 {{1, 3},
  396                 {5, 5},
  397                 {0, 0},
  398                 {0, 0}
  399                 }
  400         },
  401         {1, 0, 2, 0,            /* 0x2f */
  402                 {{0, 3},
  403                 {5, 5},
  404                 {0, 0},
  405                 {0, 0}
  406                 }
  407         },
  408         {0, 0, 1, 0,            /* 0x30 */
  409                 {{4, 5},
  410                 {0, 0},
  411                 {0, 0},
  412                 {0, 0}
  413                 }
  414         },
  415         {1, 0, 2, 0,            /* 0x31 */
  416                 {{0, 0},
  417                 {4, 5},
  418                 {0, 0},
  419                 {0, 0}
  420                 }
  421         },
  422         {0, 0, 2, 0,            /* 0x32 */
  423                 {{1, 1},
  424                 {4, 5},
  425                 {0, 0},
  426                 {0, 0}
  427                 }
  428         },
  429         {1, 0, 2, 0,            /* 0x33 */
  430                 {{0, 1},
  431                 {4, 5},
  432                 {0, 0},
  433                 {0, 0}
  434                 }
  435         },
  436         {0, 0, 2, 0,            /* 0x34 */
  437                 {{2, 2},
  438                 {4, 5},
  439                 {0, 0},
  440                 {0, 0}
  441                 }
  442         },
  443         {1, 0, 3, 0,            /* 0x35 */
  444                 {{0, 0},
  445                 {2, 2},
  446                 {4, 5},
  447                 {0, 0}
  448                 }
  449         },
  450         {0, 0, 2, 0,            /* 0x36 */
  451                 {{1, 2},
  452                 {4, 5},
  453                 {0, 0},
  454                 {0, 0}
  455                 }
  456         },
  457         {1, 0, 2, 0,            /* 0x37 */
  458                 {{0, 2},
  459                 {4, 5},
  460                 {0, 0},
  461                 {0, 0}
  462                 }
  463         },
  464         {0, 0, 1, 0,            /* 0x38 */
  465                 {{3, 5},
  466                 {0, 0},
  467                 {0, 0},
  468                 {0, 0}
  469                 }
  470         },
  471         {1, 0, 2, 0,            /* 0x39 */
  472                 {{0, 0},
  473                 {3, 5},
  474                 {0, 0},
  475                 {0, 0}
  476                 }
  477         },
  478         {0, 0, 2, 0,            /* 0x3a */
  479                 {{1, 1},
  480                 {3, 5},
  481                 {0, 0},
  482                 {0, 0}
  483                 }
  484         },
  485         {1, 0, 2, 0,            /* 0x3b */
  486                 {{0, 1},
  487                 {3, 5},
  488                 {0, 0},
  489                 {0, 0}
  490                 }
  491         },
  492         {0, 0, 1, 0,            /* 0x3c */
  493                 {{2, 5},
  494                 {0, 0},
  495                 {0, 0},
  496                 {0, 0}
  497                 }
  498         },
  499         {1, 0, 2, 0,            /* 0x3d */
  500                 {{0, 0},
  501                 {2, 5},
  502                 {0, 0},
  503                 {0, 0}
  504                 }
  505         },
  506         {0, 0, 1, 0,            /* 0x3e */
  507                 {{1, 5},
  508                 {0, 0},
  509                 {0, 0},
  510                 {0, 0}
  511                 }
  512         },
  513         {1, 0, 1, 0,            /* 0x3f */
  514                 {{0, 5},
  515                 {0, 0},
  516                 {0, 0},
  517                 {0, 0}
  518                 }
  519         },
  520         {0, 0, 1, 0,            /* 0x40 */
  521                 {{6, 6},
  522                 {0, 0},
  523                 {0, 0},
  524                 {0, 0}
  525                 }
  526         },
  527         {1, 0, 2, 0,            /* 0x41 */
  528                 {{0, 0},
  529                 {6, 6},
  530                 {0, 0},
  531                 {0, 0}
  532                 }
  533         },
  534         {0, 0, 2, 0,            /* 0x42 */
  535                 {{1, 1},
  536                 {6, 6},
  537                 {0, 0},
  538                 {0, 0}
  539                 }
  540         },
  541         {1, 0, 2, 0,            /* 0x43 */
  542                 {{0, 1},
  543                 {6, 6},
  544                 {0, 0},
  545                 {0, 0}
  546                 }
  547         },
  548         {0, 0, 2, 0,            /* 0x44 */
  549                 {{2, 2},
  550                 {6, 6},
  551                 {0, 0},
  552                 {0, 0}
  553                 }
  554         },
  555         {1, 0, 3, 0,            /* 0x45 */
  556                 {{0, 0},
  557                 {2, 2},
  558                 {6, 6},
  559                 {0, 0}
  560                 }
  561         },
  562         {0, 0, 2, 0,            /* 0x46 */
  563                 {{1, 2},
  564                 {6, 6},
  565                 {0, 0},
  566                 {0, 0}
  567                 }
  568         },
  569         {1, 0, 2, 0,            /* 0x47 */
  570                 {{0, 2},
  571                 {6, 6},
  572                 {0, 0},
  573                 {0, 0}
  574                 }
  575         },
  576         {0, 0, 2, 0,            /* 0x48 */
  577                 {{3, 3},
  578                 {6, 6},
  579                 {0, 0},
  580                 {0, 0}
  581                 }
  582         },
  583         {1, 0, 3, 0,            /* 0x49 */
  584                 {{0, 0},
  585                 {3, 3},
  586                 {6, 6},
  587                 {0, 0}
  588                 }
  589         },
  590         {0, 0, 3, 0,            /* 0x4a */
  591                 {{1, 1},
  592                 {3, 3},
  593                 {6, 6},
  594                 {0, 0}
  595                 }
  596         },
  597         {1, 0, 3, 0,            /* 0x4b */
  598                 {{0, 1},
  599                 {3, 3},
  600                 {6, 6},
  601                 {0, 0}
  602                 }
  603         },
  604         {0, 0, 2, 0,            /* 0x4c */
  605                 {{2, 3},
  606                 {6, 6},
  607                 {0, 0},
  608                 {0, 0}
  609                 }
  610         },
  611         {1, 0, 3, 0,            /* 0x4d */
  612                 {{0, 0},
  613                 {2, 3},
  614                 {6, 6},
  615                 {0, 0}
  616                 }
  617         },
  618         {0, 0, 2, 0,            /* 0x4e */
  619                 {{1, 3},
  620                 {6, 6},
  621                 {0, 0},
  622                 {0, 0}
  623                 }
  624         },
  625         {1, 0, 2, 0,            /* 0x4f */
  626                 {{0, 3},
  627                 {6, 6},
  628                 {0, 0},
  629                 {0, 0}
  630                 }
  631         },
  632         {0, 0, 2, 0,            /* 0x50 */
  633                 {{4, 4},
  634                 {6, 6},
  635                 {0, 0},
  636                 {0, 0}
  637                 }
  638         },
  639         {1, 0, 3, 0,            /* 0x51 */
  640                 {{0, 0},
  641                 {4, 4},
  642                 {6, 6},
  643                 {0, 0}
  644                 }
  645         },
  646         {0, 0, 3, 0,            /* 0x52 */
  647                 {{1, 1},
  648                 {4, 4},
  649                 {6, 6},
  650                 {0, 0}
  651                 }
  652         },
  653         {1, 0, 3, 0,            /* 0x53 */
  654                 {{0, 1},
  655                 {4, 4},
  656                 {6, 6},
  657                 {0, 0}
  658                 }
  659         },
  660         {0, 0, 3, 0,            /* 0x54 */
  661                 {{2, 2},
  662                 {4, 4},
  663                 {6, 6},
  664                 {0, 0}
  665                 }
  666         },
  667         {1, 0, 4, 0,            /* 0x55 */
  668                 {{0, 0},
  669                 {2, 2},
  670                 {4, 4},
  671                 {6, 6}
  672                 }
  673         },
  674         {0, 0, 3, 0,            /* 0x56 */
  675                 {{1, 2},
  676                 {4, 4},
  677                 {6, 6},
  678                 {0, 0}
  679                 }
  680         },
  681         {1, 0, 3, 0,            /* 0x57 */
  682                 {{0, 2},
  683                 {4, 4},
  684                 {6, 6},
  685                 {0, 0}
  686                 }
  687         },
  688         {0, 0, 2, 0,            /* 0x58 */
  689                 {{3, 4},
  690                 {6, 6},
  691                 {0, 0},
  692                 {0, 0}
  693                 }
  694         },
  695         {1, 0, 3, 0,            /* 0x59 */
  696                 {{0, 0},
  697                 {3, 4},
  698                 {6, 6},
  699                 {0, 0}
  700                 }
  701         },
  702         {0, 0, 3, 0,            /* 0x5a */
  703                 {{1, 1},
  704                 {3, 4},
  705                 {6, 6},
  706                 {0, 0}
  707                 }
  708         },
  709         {1, 0, 3, 0,            /* 0x5b */
  710                 {{0, 1},
  711                 {3, 4},
  712                 {6, 6},
  713                 {0, 0}
  714                 }
  715         },
  716         {0, 0, 2, 0,            /* 0x5c */
  717                 {{2, 4},
  718                 {6, 6},
  719                 {0, 0},
  720                 {0, 0}
  721                 }
  722         },
  723         {1, 0, 3, 0,            /* 0x5d */
  724                 {{0, 0},
  725                 {2, 4},
  726                 {6, 6},
  727                 {0, 0}
  728                 }
  729         },
  730         {0, 0, 2, 0,            /* 0x5e */
  731                 {{1, 4},
  732                 {6, 6},
  733                 {0, 0},
  734                 {0, 0}
  735                 }
  736         },
  737         {1, 0, 2, 0,            /* 0x5f */
  738                 {{0, 4},
  739                 {6, 6},
  740                 {0, 0},
  741                 {0, 0}
  742                 }
  743         },
  744         {0, 0, 1, 0,            /* 0x60 */
  745                 {{5, 6},
  746                 {0, 0},
  747                 {0, 0},
  748                 {0, 0}
  749                 }
  750         },
  751         {1, 0, 2, 0,            /* 0x61 */
  752                 {{0, 0},
  753                 {5, 6},
  754                 {0, 0},
  755                 {0, 0}
  756                 }
  757         },
  758         {0, 0, 2, 0,            /* 0x62 */
  759                 {{1, 1},
  760                 {5, 6},
  761                 {0, 0},
  762                 {0, 0}
  763                 }
  764         },
  765         {1, 0, 2, 0,            /* 0x63 */
  766                 {{0, 1},
  767                 {5, 6},
  768                 {0, 0},
  769                 {0, 0}
  770                 }
  771         },
  772         {0, 0, 2, 0,            /* 0x64 */
  773                 {{2, 2},
  774                 {5, 6},
  775                 {0, 0},
  776                 {0, 0}
  777                 }
  778         },
  779         {1, 0, 3, 0,            /* 0x65 */
  780                 {{0, 0},
  781                 {2, 2},
  782                 {5, 6},
  783                 {0, 0}
  784                 }
  785         },
  786         {0, 0, 2, 0,            /* 0x66 */
  787                 {{1, 2},
  788                 {5, 6},
  789                 {0, 0},
  790                 {0, 0}
  791                 }
  792         },
  793         {1, 0, 2, 0,            /* 0x67 */
  794                 {{0, 2},
  795                 {5, 6},
  796                 {0, 0},
  797                 {0, 0}
  798                 }
  799         },
  800         {0, 0, 2, 0,            /* 0x68 */
  801                 {{3, 3},
  802                 {5, 6},
  803                 {0, 0},
  804                 {0, 0}
  805                 }
  806         },
  807         {1, 0, 3, 0,            /* 0x69 */
  808                 {{0, 0},
  809                 {3, 3},
  810                 {5, 6},
  811                 {0, 0}
  812                 }
  813         },
  814         {0, 0, 3, 0,            /* 0x6a */
  815                 {{1, 1},
  816                 {3, 3},
  817                 {5, 6},
  818                 {0, 0}
  819                 }
  820         },
  821         {1, 0, 3, 0,            /* 0x6b */
  822                 {{0, 1},
  823                 {3, 3},
  824                 {5, 6},
  825                 {0, 0}
  826                 }
  827         },
  828         {0, 0, 2, 0,            /* 0x6c */
  829                 {{2, 3},
  830                 {5, 6},
  831                 {0, 0},
  832                 {0, 0}
  833                 }
  834         },
  835         {1, 0, 3, 0,            /* 0x6d */
  836                 {{0, 0},
  837                 {2, 3},
  838                 {5, 6},
  839                 {0, 0}
  840                 }
  841         },
  842         {0, 0, 2, 0,            /* 0x6e */
  843                 {{1, 3},
  844                 {5, 6},
  845                 {0, 0},
  846                 {0, 0}
  847                 }
  848         },
  849         {1, 0, 2, 0,            /* 0x6f */
  850                 {{0, 3},
  851                 {5, 6},
  852                 {0, 0},
  853                 {0, 0}
  854                 }
  855         },
  856         {0, 0, 1, 0,            /* 0x70 */
  857                 {{4, 6},
  858                 {0, 0},
  859                 {0, 0},
  860                 {0, 0}
  861                 }
  862         },
  863         {1, 0, 2, 0,            /* 0x71 */
  864                 {{0, 0},
  865                 {4, 6},
  866                 {0, 0},
  867                 {0, 0}
  868                 }
  869         },
  870         {0, 0, 2, 0,            /* 0x72 */
  871                 {{1, 1},
  872                 {4, 6},
  873                 {0, 0},
  874                 {0, 0}
  875                 }
  876         },
  877         {1, 0, 2, 0,            /* 0x73 */
  878                 {{0, 1},
  879                 {4, 6},
  880                 {0, 0},
  881                 {0, 0}
  882                 }
  883         },
  884         {0, 0, 2, 0,            /* 0x74 */
  885                 {{2, 2},
  886                 {4, 6},
  887                 {0, 0},
  888                 {0, 0}
  889                 }
  890         },
  891         {1, 0, 3, 0,            /* 0x75 */
  892                 {{0, 0},
  893                 {2, 2},
  894                 {4, 6},
  895                 {0, 0}
  896                 }
  897         },
  898         {0, 0, 2, 0,            /* 0x76 */
  899                 {{1, 2},
  900                 {4, 6},
  901                 {0, 0},
  902                 {0, 0}
  903                 }
  904         },
  905         {1, 0, 2, 0,            /* 0x77 */
  906                 {{0, 2},
  907                 {4, 6},
  908                 {0, 0},
  909                 {0, 0}
  910                 }
  911         },
  912         {0, 0, 1, 0,            /* 0x78 */
  913                 {{3, 6},
  914                 {0, 0},
  915                 {0, 0},
  916                 {0, 0}
  917                 }
  918         },
  919         {1, 0, 2, 0,            /* 0x79 */
  920                 {{0, 0},
  921                 {3, 6},
  922                 {0, 0},
  923                 {0, 0}
  924                 }
  925         },
  926         {0, 0, 2, 0,            /* 0x7a */
  927                 {{1, 1},
  928                 {3, 6},
  929                 {0, 0},
  930                 {0, 0}
  931                 }
  932         },
  933         {1, 0, 2, 0,            /* 0x7b */
  934                 {{0, 1},
  935                 {3, 6},
  936                 {0, 0},
  937                 {0, 0}
  938                 }
  939         },
  940         {0, 0, 1, 0,            /* 0x7c */
  941                 {{2, 6},
  942                 {0, 0},
  943                 {0, 0},
  944                 {0, 0}
  945                 }
  946         },
  947         {1, 0, 2, 0,            /* 0x7d */
  948                 {{0, 0},
  949                 {2, 6},
  950                 {0, 0},
  951                 {0, 0}
  952                 }
  953         },
  954         {0, 0, 1, 0,            /* 0x7e */
  955                 {{1, 6},
  956                 {0, 0},
  957                 {0, 0},
  958                 {0, 0}
  959                 }
  960         },
  961         {1, 0, 1, 0,            /* 0x7f */
  962                 {{0, 6},
  963                 {0, 0},
  964                 {0, 0},
  965                 {0, 0}
  966                 }
  967         },
  968         {0, 1, 1, 0,            /* 0x80 */
  969                 {{7, 7},
  970                 {0, 0},
  971                 {0, 0},
  972                 {0, 0}
  973                 }
  974         },
  975         {1, 1, 2, 0,            /* 0x81 */
  976                 {{0, 0},
  977                 {7, 7},
  978                 {0, 0},
  979                 {0, 0}
  980                 }
  981         },
  982         {0, 1, 2, 0,            /* 0x82 */
  983                 {{1, 1},
  984                 {7, 7},
  985                 {0, 0},
  986                 {0, 0}
  987                 }
  988         },
  989         {1, 1, 2, 0,            /* 0x83 */
  990                 {{0, 1},
  991                 {7, 7},
  992                 {0, 0},
  993                 {0, 0}
  994                 }
  995         },
  996         {0, 1, 2, 0,            /* 0x84 */
  997                 {{2, 2},
  998                 {7, 7},
  999                 {0, 0},
 1000                 {0, 0}
 1001                 }
 1002         },
 1003         {1, 1, 3, 0,            /* 0x85 */
 1004                 {{0, 0},
 1005                 {2, 2},
 1006                 {7, 7},
 1007                 {0, 0}
 1008                 }
 1009         },
 1010         {0, 1, 2, 0,            /* 0x86 */
 1011                 {{1, 2},
 1012                 {7, 7},
 1013                 {0, 0},
 1014                 {0, 0}
 1015                 }
 1016         },
 1017         {1, 1, 2, 0,            /* 0x87 */
 1018                 {{0, 2},
 1019                 {7, 7},
 1020                 {0, 0},
 1021                 {0, 0}
 1022                 }
 1023         },
 1024         {0, 1, 2, 0,            /* 0x88 */
 1025                 {{3, 3},
 1026                 {7, 7},
 1027                 {0, 0},
 1028                 {0, 0}
 1029                 }
 1030         },
 1031         {1, 1, 3, 0,            /* 0x89 */
 1032                 {{0, 0},
 1033                 {3, 3},
 1034                 {7, 7},
 1035                 {0, 0}
 1036                 }
 1037         },
 1038         {0, 1, 3, 0,            /* 0x8a */
 1039                 {{1, 1},
 1040                 {3, 3},
 1041                 {7, 7},
 1042                 {0, 0}
 1043                 }
 1044         },
 1045         {1, 1, 3, 0,            /* 0x8b */
 1046                 {{0, 1},
 1047                 {3, 3},
 1048                 {7, 7},
 1049                 {0, 0}
 1050                 }
 1051         },
 1052         {0, 1, 2, 0,            /* 0x8c */
 1053                 {{2, 3},
 1054                 {7, 7},
 1055                 {0, 0},
 1056                 {0, 0}
 1057                 }
 1058         },
 1059         {1, 1, 3, 0,            /* 0x8d */
 1060                 {{0, 0},
 1061                 {2, 3},
 1062                 {7, 7},
 1063                 {0, 0}
 1064                 }
 1065         },
 1066         {0, 1, 2, 0,            /* 0x8e */
 1067                 {{1, 3},
 1068                 {7, 7},
 1069                 {0, 0},
 1070                 {0, 0}
 1071                 }
 1072         },
 1073         {1, 1, 2, 0,            /* 0x8f */
 1074                 {{0, 3},
 1075                 {7, 7},
 1076                 {0, 0},
 1077                 {0, 0}
 1078                 }
 1079         },
 1080         {0, 1, 2, 0,            /* 0x90 */
 1081                 {{4, 4},
 1082                 {7, 7},
 1083                 {0, 0},
 1084                 {0, 0}
 1085                 }
 1086         },
 1087         {1, 1, 3, 0,            /* 0x91 */
 1088                 {{0, 0},
 1089                 {4, 4},
 1090                 {7, 7},
 1091                 {0, 0}
 1092                 }
 1093         },
 1094         {0, 1, 3, 0,            /* 0x92 */
 1095                 {{1, 1},
 1096                 {4, 4},
 1097                 {7, 7},
 1098                 {0, 0}
 1099                 }
 1100         },
 1101         {1, 1, 3, 0,            /* 0x93 */
 1102                 {{0, 1},
 1103                 {4, 4},
 1104                 {7, 7},
 1105                 {0, 0}
 1106                 }
 1107         },
 1108         {0, 1, 3, 0,            /* 0x94 */
 1109                 {{2, 2},
 1110                 {4, 4},
 1111                 {7, 7},
 1112                 {0, 0}
 1113                 }
 1114         },
 1115         {1, 1, 4, 0,            /* 0x95 */
 1116                 {{0, 0},
 1117                 {2, 2},
 1118                 {4, 4},
 1119                 {7, 7}
 1120                 }
 1121         },
 1122         {0, 1, 3, 0,            /* 0x96 */
 1123                 {{1, 2},
 1124                 {4, 4},
 1125                 {7, 7},
 1126                 {0, 0}
 1127                 }
 1128         },
 1129         {1, 1, 3, 0,            /* 0x97 */
 1130                 {{0, 2},
 1131                 {4, 4},
 1132                 {7, 7},
 1133                 {0, 0}
 1134                 }
 1135         },
 1136         {0, 1, 2, 0,            /* 0x98 */
 1137                 {{3, 4},
 1138                 {7, 7},
 1139                 {0, 0},
 1140                 {0, 0}
 1141                 }
 1142         },
 1143         {1, 1, 3, 0,            /* 0x99 */
 1144                 {{0, 0},
 1145                 {3, 4},
 1146                 {7, 7},
 1147                 {0, 0}
 1148                 }
 1149         },
 1150         {0, 1, 3, 0,            /* 0x9a */
 1151                 {{1, 1},
 1152                 {3, 4},
 1153                 {7, 7},
 1154                 {0, 0}
 1155                 }
 1156         },
 1157         {1, 1, 3, 0,            /* 0x9b */
 1158                 {{0, 1},
 1159                 {3, 4},
 1160                 {7, 7},
 1161                 {0, 0}
 1162                 }
 1163         },
 1164         {0, 1, 2, 0,            /* 0x9c */
 1165                 {{2, 4},
 1166                 {7, 7},
 1167                 {0, 0},
 1168                 {0, 0}
 1169                 }
 1170         },
 1171         {1, 1, 3, 0,            /* 0x9d */
 1172                 {{0, 0},
 1173                 {2, 4},
 1174                 {7, 7},
 1175                 {0, 0}
 1176                 }
 1177         },
 1178         {0, 1, 2, 0,            /* 0x9e */
 1179                 {{1, 4},
 1180                 {7, 7},
 1181                 {0, 0},
 1182                 {0, 0}
 1183                 }
 1184         },
 1185         {1, 1, 2, 0,            /* 0x9f */
 1186                 {{0, 4},
 1187                 {7, 7},
 1188                 {0, 0},
 1189                 {0, 0}
 1190                 }
 1191         },
 1192         {0, 1, 2, 0,            /* 0xa0 */
 1193                 {{5, 5},
 1194                 {7, 7},
 1195                 {0, 0},
 1196                 {0, 0}
 1197                 }
 1198         },
 1199         {1, 1, 3, 0,            /* 0xa1 */
 1200                 {{0, 0},
 1201                 {5, 5},
 1202                 {7, 7},
 1203                 {0, 0}
 1204                 }
 1205         },
 1206         {0, 1, 3, 0,            /* 0xa2 */
 1207                 {{1, 1},
 1208                 {5, 5},
 1209                 {7, 7},
 1210                 {0, 0}
 1211                 }
 1212         },
 1213         {1, 1, 3, 0,            /* 0xa3 */
 1214                 {{0, 1},
 1215                 {5, 5},
 1216                 {7, 7},
 1217                 {0, 0}
 1218                 }
 1219         },
 1220         {0, 1, 3, 0,            /* 0xa4 */
 1221                 {{2, 2},
 1222                 {5, 5},
 1223                 {7, 7},
 1224                 {0, 0}
 1225                 }
 1226         },
 1227         {1, 1, 4, 0,            /* 0xa5 */
 1228                 {{0, 0},
 1229                 {2, 2},
 1230                 {5, 5},
 1231                 {7, 7}
 1232                 }
 1233         },
 1234         {0, 1, 3, 0,            /* 0xa6 */
 1235                 {{1, 2},
 1236                 {5, 5},
 1237                 {7, 7},
 1238                 {0, 0}
 1239                 }
 1240         },
 1241         {1, 1, 3, 0,            /* 0xa7 */
 1242                 {{0, 2},
 1243                 {5, 5},
 1244                 {7, 7},
 1245                 {0, 0}
 1246                 }
 1247         },
 1248         {0, 1, 3, 0,            /* 0xa8 */
 1249                 {{3, 3},
 1250                 {5, 5},
 1251                 {7, 7},
 1252                 {0, 0}
 1253                 }
 1254         },
 1255         {1, 1, 4, 0,            /* 0xa9 */
 1256                 {{0, 0},
 1257                 {3, 3},
 1258                 {5, 5},
 1259                 {7, 7}
 1260                 }
 1261         },
 1262         {0, 1, 4, 0,            /* 0xaa */
 1263                 {{1, 1},
 1264                 {3, 3},
 1265                 {5, 5},
 1266                 {7, 7}
 1267                 }
 1268         },
 1269         {1, 1, 4, 0,            /* 0xab */
 1270                 {{0, 1},
 1271                 {3, 3},
 1272                 {5, 5},
 1273                 {7, 7}
 1274                 }
 1275         },
 1276         {0, 1, 3, 0,            /* 0xac */
 1277                 {{2, 3},
 1278                 {5, 5},
 1279                 {7, 7},
 1280                 {0, 0}
 1281                 }
 1282         },
 1283         {1, 1, 4, 0,            /* 0xad */
 1284                 {{0, 0},
 1285                 {2, 3},
 1286                 {5, 5},
 1287                 {7, 7}
 1288                 }
 1289         },
 1290         {0, 1, 3, 0,            /* 0xae */
 1291                 {{1, 3},
 1292                 {5, 5},
 1293                 {7, 7},
 1294                 {0, 0}
 1295                 }
 1296         },
 1297         {1, 1, 3, 0,            /* 0xaf */
 1298                 {{0, 3},
 1299                 {5, 5},
 1300                 {7, 7},
 1301                 {0, 0}
 1302                 }
 1303         },
 1304         {0, 1, 2, 0,            /* 0xb0 */
 1305                 {{4, 5},
 1306                 {7, 7},
 1307                 {0, 0},
 1308                 {0, 0}
 1309                 }
 1310         },
 1311         {1, 1, 3, 0,            /* 0xb1 */
 1312                 {{0, 0},
 1313                 {4, 5},
 1314                 {7, 7},
 1315                 {0, 0}
 1316                 }
 1317         },
 1318         {0, 1, 3, 0,            /* 0xb2 */
 1319                 {{1, 1},
 1320                 {4, 5},
 1321                 {7, 7},
 1322                 {0, 0}
 1323                 }
 1324         },
 1325         {1, 1, 3, 0,            /* 0xb3 */
 1326                 {{0, 1},
 1327                 {4, 5},
 1328                 {7, 7},
 1329                 {0, 0}
 1330                 }
 1331         },
 1332         {0, 1, 3, 0,            /* 0xb4 */
 1333                 {{2, 2},
 1334                 {4, 5},
 1335                 {7, 7},
 1336                 {0, 0}
 1337                 }
 1338         },
 1339         {1, 1, 4, 0,            /* 0xb5 */
 1340                 {{0, 0},
 1341                 {2, 2},
 1342                 {4, 5},
 1343                 {7, 7}
 1344                 }
 1345         },
 1346         {0, 1, 3, 0,            /* 0xb6 */
 1347                 {{1, 2},
 1348                 {4, 5},
 1349                 {7, 7},
 1350                 {0, 0}
 1351                 }
 1352         },
 1353         {1, 1, 3, 0,            /* 0xb7 */
 1354                 {{0, 2},
 1355                 {4, 5},
 1356                 {7, 7},
 1357                 {0, 0}
 1358                 }
 1359         },
 1360         {0, 1, 2, 0,            /* 0xb8 */
 1361                 {{3, 5},
 1362                 {7, 7},
 1363                 {0, 0},
 1364                 {0, 0}
 1365                 }
 1366         },
 1367         {1, 1, 3, 0,            /* 0xb9 */
 1368                 {{0, 0},
 1369                 {3, 5},
 1370                 {7, 7},
 1371                 {0, 0}
 1372                 }
 1373         },
 1374         {0, 1, 3, 0,            /* 0xba */
 1375                 {{1, 1},
 1376                 {3, 5},
 1377                 {7, 7},
 1378                 {0, 0}
 1379                 }
 1380         },
 1381         {1, 1, 3, 0,            /* 0xbb */
 1382                 {{0, 1},
 1383                 {3, 5},
 1384                 {7, 7},
 1385                 {0, 0}
 1386                 }
 1387         },
 1388         {0, 1, 2, 0,            /* 0xbc */
 1389                 {{2, 5},
 1390                 {7, 7},
 1391                 {0, 0},
 1392                 {0, 0}
 1393                 }
 1394         },
 1395         {1, 1, 3, 0,            /* 0xbd */
 1396                 {{0, 0},
 1397                 {2, 5},
 1398                 {7, 7},
 1399                 {0, 0}
 1400                 }
 1401         },
 1402         {0, 1, 2, 0,            /* 0xbe */
 1403                 {{1, 5},
 1404                 {7, 7},
 1405                 {0, 0},
 1406                 {0, 0}
 1407                 }
 1408         },
 1409         {1, 1, 2, 0,            /* 0xbf */
 1410                 {{0, 5},
 1411                 {7, 7},
 1412                 {0, 0},
 1413                 {0, 0}
 1414                 }
 1415         },
 1416         {0, 1, 1, 0,            /* 0xc0 */
 1417                 {{6, 7},
 1418                 {0, 0},
 1419                 {0, 0},
 1420                 {0, 0}
 1421                 }
 1422         },
 1423         {1, 1, 2, 0,            /* 0xc1 */
 1424                 {{0, 0},
 1425                 {6, 7},
 1426                 {0, 0},
 1427                 {0, 0}
 1428                 }
 1429         },
 1430         {0, 1, 2, 0,            /* 0xc2 */
 1431                 {{1, 1},
 1432                 {6, 7},
 1433                 {0, 0},
 1434                 {0, 0}
 1435                 }
 1436         },
 1437         {1, 1, 2, 0,            /* 0xc3 */
 1438                 {{0, 1},
 1439                 {6, 7},
 1440                 {0, 0},
 1441                 {0, 0}
 1442                 }
 1443         },
 1444         {0, 1, 2, 0,            /* 0xc4 */
 1445                 {{2, 2},
 1446                 {6, 7},
 1447                 {0, 0},
 1448                 {0, 0}
 1449                 }
 1450         },
 1451         {1, 1, 3, 0,            /* 0xc5 */
 1452                 {{0, 0},
 1453                 {2, 2},
 1454                 {6, 7},
 1455                 {0, 0}
 1456                 }
 1457         },
 1458         {0, 1, 2, 0,            /* 0xc6 */
 1459                 {{1, 2},
 1460                 {6, 7},
 1461                 {0, 0},
 1462                 {0, 0}
 1463                 }
 1464         },
 1465         {1, 1, 2, 0,            /* 0xc7 */
 1466                 {{0, 2},
 1467                 {6, 7},
 1468                 {0, 0},
 1469                 {0, 0}
 1470                 }
 1471         },
 1472         {0, 1, 2, 0,            /* 0xc8 */
 1473                 {{3, 3},
 1474                 {6, 7},
 1475                 {0, 0},
 1476                 {0, 0}
 1477                 }
 1478         },
 1479         {1, 1, 3, 0,            /* 0xc9 */
 1480                 {{0, 0},
 1481                 {3, 3},
 1482                 {6, 7},
 1483                 {0, 0}
 1484                 }
 1485         },
 1486         {0, 1, 3, 0,            /* 0xca */
 1487                 {{1, 1},
 1488                 {3, 3},
 1489                 {6, 7},
 1490                 {0, 0}
 1491                 }
 1492         },
 1493         {1, 1, 3, 0,            /* 0xcb */
 1494                 {{0, 1},
 1495                 {3, 3},
 1496                 {6, 7},
 1497                 {0, 0}
 1498                 }
 1499         },
 1500         {0, 1, 2, 0,            /* 0xcc */
 1501                 {{2, 3},
 1502                 {6, 7},
 1503                 {0, 0},
 1504                 {0, 0}
 1505                 }
 1506         },
 1507         {1, 1, 3, 0,            /* 0xcd */
 1508                 {{0, 0},
 1509                 {2, 3},
 1510                 {6, 7},
 1511                 {0, 0}
 1512                 }
 1513         },
 1514         {0, 1, 2, 0,            /* 0xce */
 1515                 {{1, 3},
 1516                 {6, 7},
 1517                 {0, 0},
 1518                 {0, 0}
 1519                 }
 1520         },
 1521         {1, 1, 2, 0,            /* 0xcf */
 1522                 {{0, 3},
 1523                 {6, 7},
 1524                 {0, 0},
 1525                 {0, 0}
 1526                 }
 1527         },
 1528         {0, 1, 2, 0,            /* 0xd0 */
 1529                 {{4, 4},
 1530                 {6, 7},
 1531                 {0, 0},
 1532                 {0, 0}
 1533                 }
 1534         },
 1535         {1, 1, 3, 0,            /* 0xd1 */
 1536                 {{0, 0},
 1537                 {4, 4},
 1538                 {6, 7},
 1539                 {0, 0}
 1540                 }
 1541         },
 1542         {0, 1, 3, 0,            /* 0xd2 */
 1543                 {{1, 1},
 1544                 {4, 4},
 1545                 {6, 7},
 1546                 {0, 0}
 1547                 }
 1548         },
 1549         {1, 1, 3, 0,            /* 0xd3 */
 1550                 {{0, 1},
 1551                 {4, 4},
 1552                 {6, 7},
 1553                 {0, 0}
 1554                 }
 1555         },
 1556         {0, 1, 3, 0,            /* 0xd4 */
 1557                 {{2, 2},
 1558                 {4, 4},
 1559                 {6, 7},
 1560                 {0, 0}
 1561                 }
 1562         },
 1563         {1, 1, 4, 0,            /* 0xd5 */
 1564                 {{0, 0},
 1565                 {2, 2},
 1566                 {4, 4},
 1567                 {6, 7}
 1568                 }
 1569         },
 1570         {0, 1, 3, 0,            /* 0xd6 */
 1571                 {{1, 2},
 1572                 {4, 4},
 1573                 {6, 7},
 1574                 {0, 0}
 1575                 }
 1576         },
 1577         {1, 1, 3, 0,            /* 0xd7 */
 1578                 {{0, 2},
 1579                 {4, 4},
 1580                 {6, 7},
 1581                 {0, 0}
 1582                 }
 1583         },
 1584         {0, 1, 2, 0,            /* 0xd8 */
 1585                 {{3, 4},
 1586                 {6, 7},
 1587                 {0, 0},
 1588                 {0, 0}
 1589                 }
 1590         },
 1591         {1, 1, 3, 0,            /* 0xd9 */
 1592                 {{0, 0},
 1593                 {3, 4},
 1594                 {6, 7},
 1595                 {0, 0}
 1596                 }
 1597         },
 1598         {0, 1, 3, 0,            /* 0xda */
 1599                 {{1, 1},
 1600                 {3, 4},
 1601                 {6, 7},
 1602                 {0, 0}
 1603                 }
 1604         },
 1605         {1, 1, 3, 0,            /* 0xdb */
 1606                 {{0, 1},
 1607                 {3, 4},
 1608                 {6, 7},
 1609                 {0, 0}
 1610                 }
 1611         },
 1612         {0, 1, 2, 0,            /* 0xdc */
 1613                 {{2, 4},
 1614                 {6, 7},
 1615                 {0, 0},
 1616                 {0, 0}
 1617                 }
 1618         },
 1619         {1, 1, 3, 0,            /* 0xdd */
 1620                 {{0, 0},
 1621                 {2, 4},
 1622                 {6, 7},
 1623                 {0, 0}
 1624                 }
 1625         },
 1626         {0, 1, 2, 0,            /* 0xde */
 1627                 {{1, 4},
 1628                 {6, 7},
 1629                 {0, 0},
 1630                 {0, 0}
 1631                 }
 1632         },
 1633         {1, 1, 2, 0,            /* 0xdf */
 1634                 {{0, 4},
 1635                 {6, 7},
 1636                 {0, 0},
 1637                 {0, 0}
 1638                 }
 1639         },
 1640         {0, 1, 1, 0,            /* 0xe0 */
 1641                 {{5, 7},
 1642                 {0, 0},
 1643                 {0, 0},
 1644                 {0, 0}
 1645                 }
 1646         },
 1647         {1, 1, 2, 0,            /* 0xe1 */
 1648                 {{0, 0},
 1649                 {5, 7},
 1650                 {0, 0},
 1651                 {0, 0}
 1652                 }
 1653         },
 1654         {0, 1, 2, 0,            /* 0xe2 */
 1655                 {{1, 1},
 1656                 {5, 7},
 1657                 {0, 0},
 1658                 {0, 0}
 1659                 }
 1660         },
 1661         {1, 1, 2, 0,            /* 0xe3 */
 1662                 {{0, 1},
 1663                 {5, 7},
 1664                 {0, 0},
 1665                 {0, 0}
 1666                 }
 1667         },
 1668         {0, 1, 2, 0,            /* 0xe4 */
 1669                 {{2, 2},
 1670                 {5, 7},
 1671                 {0, 0},
 1672                 {0, 0}
 1673                 }
 1674         },
 1675         {1, 1, 3, 0,            /* 0xe5 */
 1676                 {{0, 0},
 1677                 {2, 2},
 1678                 {5, 7},
 1679                 {0, 0}
 1680                 }
 1681         },
 1682         {0, 1, 2, 0,            /* 0xe6 */
 1683                 {{1, 2},
 1684                 {5, 7},
 1685                 {0, 0},
 1686                 {0, 0}
 1687                 }
 1688         },
 1689         {1, 1, 2, 0,            /* 0xe7 */
 1690                 {{0, 2},
 1691                 {5, 7},
 1692                 {0, 0},
 1693                 {0, 0}
 1694                 }
 1695         },
 1696         {0, 1, 2, 0,            /* 0xe8 */
 1697                 {{3, 3},
 1698                 {5, 7},
 1699                 {0, 0},
 1700                 {0, 0}
 1701                 }
 1702         },
 1703         {1, 1, 3, 0,            /* 0xe9 */
 1704                 {{0, 0},
 1705                 {3, 3},
 1706                 {5, 7},
 1707                 {0, 0}
 1708                 }
 1709         },
 1710         {0, 1, 3, 0,            /* 0xea */
 1711                 {{1, 1},
 1712                 {3, 3},
 1713                 {5, 7},
 1714                 {0, 0}
 1715                 }
 1716         },
 1717         {1, 1, 3, 0,            /* 0xeb */
 1718                 {{0, 1},
 1719                 {3, 3},
 1720                 {5, 7},
 1721                 {0, 0}
 1722                 }
 1723         },
 1724         {0, 1, 2, 0,            /* 0xec */
 1725                 {{2, 3},
 1726                 {5, 7},
 1727                 {0, 0},
 1728                 {0, 0}
 1729                 }
 1730         },
 1731         {1, 1, 3, 0,            /* 0xed */
 1732                 {{0, 0},
 1733                 {2, 3},
 1734                 {5, 7},
 1735                 {0, 0}
 1736                 }
 1737         },
 1738         {0, 1, 2, 0,            /* 0xee */
 1739                 {{1, 3},
 1740                 {5, 7},
 1741                 {0, 0},
 1742                 {0, 0}
 1743                 }
 1744         },
 1745         {1, 1, 2, 0,            /* 0xef */
 1746                 {{0, 3},
 1747                 {5, 7},
 1748                 {0, 0},
 1749                 {0, 0}
 1750                 }
 1751         },
 1752         {0, 1, 1, 0,            /* 0xf0 */
 1753                 {{4, 7},
 1754                 {0, 0},
 1755                 {0, 0},
 1756                 {0, 0}
 1757                 }
 1758         },
 1759         {1, 1, 2, 0,            /* 0xf1 */
 1760                 {{0, 0},
 1761                 {4, 7},
 1762                 {0, 0},
 1763                 {0, 0}
 1764                 }
 1765         },
 1766         {0, 1, 2, 0,            /* 0xf2 */
 1767                 {{1, 1},
 1768                 {4, 7},
 1769                 {0, 0},
 1770                 {0, 0}
 1771                 }
 1772         },
 1773         {1, 1, 2, 0,            /* 0xf3 */
 1774                 {{0, 1},
 1775                 {4, 7},
 1776                 {0, 0},
 1777                 {0, 0}
 1778                 }
 1779         },
 1780         {0, 1, 2, 0,            /* 0xf4 */
 1781                 {{2, 2},
 1782                 {4, 7},
 1783                 {0, 0},
 1784                 {0, 0}
 1785                 }
 1786         },
 1787         {1, 1, 3, 0,            /* 0xf5 */
 1788                 {{0, 0},
 1789                 {2, 2},
 1790                 {4, 7},
 1791                 {0, 0}
 1792                 }
 1793         },
 1794         {0, 1, 2, 0,            /* 0xf6 */
 1795                 {{1, 2},
 1796                 {4, 7},
 1797                 {0, 0},
 1798                 {0, 0}
 1799                 }
 1800         },
 1801         {1, 1, 2, 0,            /* 0xf7 */
 1802                 {{0, 2},
 1803                 {4, 7},
 1804                 {0, 0},
 1805                 {0, 0}
 1806                 }
 1807         },
 1808         {0, 1, 1, 0,            /* 0xf8 */
 1809                 {{3, 7},
 1810                 {0, 0},
 1811                 {0, 0},
 1812                 {0, 0}
 1813                 }
 1814         },
 1815         {1, 1, 2, 0,            /* 0xf9 */
 1816                 {{0, 0},
 1817                 {3, 7},
 1818                 {0, 0},
 1819                 {0, 0}
 1820                 }
 1821         },
 1822         {0, 1, 2, 0,            /* 0xfa */
 1823                 {{1, 1},
 1824                 {3, 7},
 1825                 {0, 0},
 1826                 {0, 0}
 1827                 }
 1828         },
 1829         {1, 1, 2, 0,            /* 0xfb */
 1830                 {{0, 1},
 1831                 {3, 7},
 1832                 {0, 0},
 1833                 {0, 0}
 1834                 }
 1835         },
 1836         {0, 1, 1, 0,            /* 0xfc */
 1837                 {{2, 7},
 1838                 {0, 0},
 1839                 {0, 0},
 1840                 {0, 0}
 1841                 }
 1842         },
 1843         {1, 1, 2, 0,            /* 0xfd */
 1844                 {{0, 0},
 1845                 {2, 7},
 1846                 {0, 0},
 1847                 {0, 0}
 1848                 }
 1849         },
 1850         {0, 1, 1, 0,            /* 0xfe */
 1851                 {{1, 7},
 1852                 {0, 0},
 1853                 {0, 0},
 1854                 {0, 0}
 1855                 }
 1856         },
 1857         {1, 1, 1, 0,            /* 0xff */
 1858                 {{0, 7},
 1859                 {0, 0},
 1860                 {0, 0},
 1861                 {0, 0}
 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 unspecified 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 struct mbuf *
 2027 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 2028     struct sctp_scoping *scope,
 2029     struct mbuf *m_at, int cnt_inits_to,
 2030     uint16_t *padding_len, uint16_t *chunk_len)
 2031 {
 2032         struct sctp_vrf *vrf = NULL;
 2033         int cnt, limit_out = 0, total_count;
 2034         uint32_t vrf_id;
 2035 
 2036         vrf_id = inp->def_vrf_id;
 2037         SCTP_IPI_ADDR_RLOCK();
 2038         vrf = sctp_find_vrf(vrf_id);
 2039         if (vrf == NULL) {
 2040                 SCTP_IPI_ADDR_RUNLOCK();
 2041                 return (m_at);
 2042         }
 2043         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 2044                 struct sctp_ifa *sctp_ifap;
 2045                 struct sctp_ifn *sctp_ifnp;
 2046 
 2047                 cnt = cnt_inits_to;
 2048                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 2049                         limit_out = 1;
 2050                         cnt = SCTP_ADDRESS_LIMIT;
 2051                         goto skip_count;
 2052                 }
 2053                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2054                         if ((scope->loopback_scope == 0) &&
 2055                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2056                                 /*
 2057                                  * Skip loopback devices if loopback_scope
 2058                                  * not set
 2059                                  */
 2060                                 continue;
 2061                         }
 2062                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2063 #ifdef INET
 2064                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2065                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2066                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
 2067                                         continue;
 2068                                 }
 2069 #endif
 2070 #ifdef INET6
 2071                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2072                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2073                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2074                                         continue;
 2075                                 }
 2076 #endif
 2077                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2078                                         continue;
 2079                                 }
 2080                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
 2081                                         continue;
 2082                                 }
 2083                                 cnt++;
 2084                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2085                                         break;
 2086                                 }
 2087                         }
 2088                         if (cnt > SCTP_ADDRESS_LIMIT) {
 2089                                 break;
 2090                         }
 2091                 }
 2092 skip_count:
 2093                 if (cnt > 1) {
 2094                         total_count = 0;
 2095                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2096                                 cnt = 0;
 2097                                 if ((scope->loopback_scope == 0) &&
 2098                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2099                                         /*
 2100                                          * Skip loopback devices if
 2101                                          * loopback_scope not set
 2102                                          */
 2103                                         continue;
 2104                                 }
 2105                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2106 #ifdef INET
 2107                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2108                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2109                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
 2110                                                 continue;
 2111                                         }
 2112 #endif
 2113 #ifdef INET6
 2114                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2115                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2116                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2117                                                 continue;
 2118                                         }
 2119 #endif
 2120                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2121                                                 continue;
 2122                                         }
 2123                                         if (sctp_is_address_in_scope(sctp_ifap,
 2124                                             scope, 0) == 0) {
 2125                                                 continue;
 2126                                         }
 2127                                         if ((chunk_len != NULL) &&
 2128                                             (padding_len != NULL) &&
 2129                                             (*padding_len > 0)) {
 2130                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2131                                                 SCTP_BUF_LEN(m_at) += *padding_len;
 2132                                                 *chunk_len += *padding_len;
 2133                                                 *padding_len = 0;
 2134                                         }
 2135                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
 2136                                         if (limit_out) {
 2137                                                 cnt++;
 2138                                                 total_count++;
 2139                                                 if (cnt >= 2) {
 2140                                                         /*
 2141                                                          * two from each
 2142                                                          * address
 2143                                                          */
 2144                                                         break;
 2145                                                 }
 2146                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 2147                                                         /* No more addresses */
 2148                                                         break;
 2149                                                 }
 2150                                         }
 2151                                 }
 2152                         }
 2153                 }
 2154         } else {
 2155                 struct sctp_laddr *laddr;
 2156 
 2157                 cnt = cnt_inits_to;
 2158                 /* First, how many ? */
 2159                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2160                         if (laddr->ifa == NULL) {
 2161                                 continue;
 2162                         }
 2163                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2164                                 /*
 2165                                  * Address being deleted by the system, dont
 2166                                  * list.
 2167                                  */
 2168                                 continue;
 2169                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2170                                 /*
 2171                                  * Address being deleted on this ep don't
 2172                                  * list.
 2173                                  */
 2174                                 continue;
 2175                         }
 2176                         if (sctp_is_address_in_scope(laddr->ifa,
 2177                             scope, 1) == 0) {
 2178                                 continue;
 2179                         }
 2180                         cnt++;
 2181                 }
 2182                 /*
 2183                  * To get through a NAT we only list addresses if we have
 2184                  * more than one. That way if you just bind a single address
 2185                  * we let the source of the init dictate our address.
 2186                  */
 2187                 if (cnt > 1) {
 2188                         cnt = cnt_inits_to;
 2189                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2190                                 if (laddr->ifa == NULL) {
 2191                                         continue;
 2192                                 }
 2193                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
 2194                                         continue;
 2195                                 }
 2196                                 if (sctp_is_address_in_scope(laddr->ifa,
 2197                                     scope, 0) == 0) {
 2198                                         continue;
 2199                                 }
 2200                                 if ((chunk_len != NULL) &&
 2201                                     (padding_len != NULL) &&
 2202                                     (*padding_len > 0)) {
 2203                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2204                                         SCTP_BUF_LEN(m_at) += *padding_len;
 2205                                         *chunk_len += *padding_len;
 2206                                         *padding_len = 0;
 2207                                 }
 2208                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
 2209                                 cnt++;
 2210                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 2211                                         break;
 2212                                 }
 2213                         }
 2214                 }
 2215         }
 2216         SCTP_IPI_ADDR_RUNLOCK();
 2217         return (m_at);
 2218 }
 2219 
 2220 static struct sctp_ifa *
 2221 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 2222     uint8_t dest_is_loop,
 2223     uint8_t dest_is_priv,
 2224     sa_family_t fam)
 2225 {
 2226         uint8_t dest_is_global = 0;
 2227 
 2228         /* dest_is_priv is true if destination is a private address */
 2229         /* dest_is_loop is true if destination is a loopback addresses */
 2230 
 2231         /**
 2232          * Here we determine if its a preferred address. A preferred address
 2233          * means it is the same scope or higher scope then the destination.
 2234          * L = loopback, P = private, G = global
 2235          * -----------------------------------------
 2236          *    src    |  dest | result
 2237          *  ----------------------------------------
 2238          *     L     |    L  |    yes
 2239          *  -----------------------------------------
 2240          *     P     |    L  |    yes-v4 no-v6
 2241          *  -----------------------------------------
 2242          *     G     |    L  |    yes-v4 no-v6
 2243          *  -----------------------------------------
 2244          *     L     |    P  |    no
 2245          *  -----------------------------------------
 2246          *     P     |    P  |    yes
 2247          *  -----------------------------------------
 2248          *     G     |    P  |    no
 2249          *   -----------------------------------------
 2250          *     L     |    G  |    no
 2251          *   -----------------------------------------
 2252          *     P     |    G  |    no
 2253          *    -----------------------------------------
 2254          *     G     |    G  |    yes
 2255          *    -----------------------------------------
 2256          */
 2257 
 2258         if (ifa->address.sa.sa_family != fam) {
 2259                 /* forget mis-matched family */
 2260                 return (NULL);
 2261         }
 2262         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 2263                 dest_is_global = 1;
 2264         }
 2265         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 2266         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 2267         /* Ok the address may be ok */
 2268 #ifdef INET6
 2269         if (fam == AF_INET6) {
 2270                 /* ok to use deprecated addresses? no lets not! */
 2271                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2272                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 2273                         return (NULL);
 2274                 }
 2275                 if (ifa->src_is_priv && !ifa->src_is_loop) {
 2276                         if (dest_is_loop) {
 2277                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 2278                                 return (NULL);
 2279                         }
 2280                 }
 2281                 if (ifa->src_is_glob) {
 2282                         if (dest_is_loop) {
 2283                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 2284                                 return (NULL);
 2285                         }
 2286                 }
 2287         }
 2288 #endif
 2289         /*
 2290          * Now that we know what is what, implement or table this could in
 2291          * theory be done slicker (it used to be), but this is
 2292          * straightforward and easier to validate :-)
 2293          */
 2294         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 2295             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 2297             dest_is_loop, dest_is_priv, dest_is_global);
 2298 
 2299         if ((ifa->src_is_loop) && (dest_is_priv)) {
 2300                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 2301                 return (NULL);
 2302         }
 2303         if ((ifa->src_is_glob) && (dest_is_priv)) {
 2304                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 2305                 return (NULL);
 2306         }
 2307         if ((ifa->src_is_loop) && (dest_is_global)) {
 2308                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 2309                 return (NULL);
 2310         }
 2311         if ((ifa->src_is_priv) && (dest_is_global)) {
 2312                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 2313                 return (NULL);
 2314         }
 2315         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 2316         /* its a preferred address */
 2317         return (ifa);
 2318 }
 2319 
 2320 static struct sctp_ifa *
 2321 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 2322     uint8_t dest_is_loop,
 2323     uint8_t dest_is_priv,
 2324     sa_family_t fam)
 2325 {
 2326         uint8_t dest_is_global = 0;
 2327 
 2328         /**
 2329          * Here we determine if its a acceptable address. A acceptable
 2330          * address means it is the same scope or higher scope but we can
 2331          * allow for NAT which means its ok to have a global dest and a
 2332          * private src.
 2333          *
 2334          * L = loopback, P = private, G = global
 2335          * -----------------------------------------
 2336          *  src    |  dest | result
 2337          * -----------------------------------------
 2338          *   L     |   L   |    yes
 2339          *  -----------------------------------------
 2340          *   P     |   L   |    yes-v4 no-v6
 2341          *  -----------------------------------------
 2342          *   G     |   L   |    yes
 2343          * -----------------------------------------
 2344          *   L     |   P   |    no
 2345          * -----------------------------------------
 2346          *   P     |   P   |    yes
 2347          * -----------------------------------------
 2348          *   G     |   P   |    yes - May not work
 2349          * -----------------------------------------
 2350          *   L     |   G   |    no
 2351          * -----------------------------------------
 2352          *   P     |   G   |    yes - May not work
 2353          * -----------------------------------------
 2354          *   G     |   G   |    yes
 2355          * -----------------------------------------
 2356          */
 2357 
 2358         if (ifa->address.sa.sa_family != fam) {
 2359                 /* forget non matching family */
 2360                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
 2361                     ifa->address.sa.sa_family, fam);
 2362                 return (NULL);
 2363         }
 2364         /* Ok the address may be ok */
 2365         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
 2366         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
 2367             dest_is_loop, dest_is_priv);
 2368         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 2369                 dest_is_global = 1;
 2370         }
 2371 #ifdef INET6
 2372         if (fam == AF_INET6) {
 2373                 /* ok to use deprecated addresses? */
 2374                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2375                         return (NULL);
 2376                 }
 2377                 if (ifa->src_is_priv) {
 2378                         /* Special case, linklocal to loop */
 2379                         if (dest_is_loop)
 2380                                 return (NULL);
 2381                 }
 2382         }
 2383 #endif
 2384         /*
 2385          * Now that we know what is what, implement our table. This could in
 2386          * theory be done slicker (it used to be), but this is
 2387          * straightforward and easier to validate :-)
 2388          */
 2389         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
 2390             ifa->src_is_loop,
 2391             dest_is_priv);
 2392         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 2393                 return (NULL);
 2394         }
 2395         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
 2396             ifa->src_is_loop,
 2397             dest_is_global);
 2398         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 2399                 return (NULL);
 2400         }
 2401         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
 2402         /* its an acceptable address */
 2403         return (ifa);
 2404 }
 2405 
 2406 int
 2407 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 2408 {
 2409         struct sctp_laddr *laddr;
 2410 
 2411         if (stcb == NULL) {
 2412                 /* There are no restrictions, no TCB :-) */
 2413                 return (0);
 2414         }
 2415         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 2416                 if (laddr->ifa == NULL) {
 2417                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2418                             __func__);
 2419                         continue;
 2420                 }
 2421                 if (laddr->ifa == ifa) {
 2422                         /* Yes it is on the list */
 2423                         return (1);
 2424                 }
 2425         }
 2426         return (0);
 2427 }
 2428 
 2429 int
 2430 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 2431 {
 2432         struct sctp_laddr *laddr;
 2433 
 2434         if (ifa == NULL)
 2435                 return (0);
 2436         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2437                 if (laddr->ifa == NULL) {
 2438                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2439                             __func__);
 2440                         continue;
 2441                 }
 2442                 if ((laddr->ifa == ifa) && laddr->action == 0)
 2443                         /* same pointer */
 2444                         return (1);
 2445         }
 2446         return (0);
 2447 }
 2448 
 2449 static struct sctp_ifa *
 2450 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 2451     sctp_route_t *ro,
 2452     uint32_t vrf_id,
 2453     int non_asoc_addr_ok,
 2454     uint8_t dest_is_priv,
 2455     uint8_t dest_is_loop,
 2456     sa_family_t fam)
 2457 {
 2458         struct sctp_laddr *laddr, *starting_point;
 2459         void *ifn;
 2460         int resettotop = 0;
 2461         struct sctp_ifn *sctp_ifn;
 2462         struct sctp_ifa *sctp_ifa, *sifa;
 2463         struct sctp_vrf *vrf;
 2464         uint32_t ifn_index;
 2465 
 2466         vrf = sctp_find_vrf(vrf_id);
 2467         if (vrf == NULL)
 2468                 return (NULL);
 2469 
 2470         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2471         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2472         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2473         /*
 2474          * first question, is the ifn we will emit on in our list, if so, we
 2475          * want such an address. Note that we first looked for a preferred
 2476          * address.
 2477          */
 2478         if (sctp_ifn) {
 2479                 /* is a preferred one on the interface we route out? */
 2480                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2481 #ifdef INET
 2482                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2483                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2484                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2485                                 continue;
 2486                         }
 2487 #endif
 2488 #ifdef INET6
 2489                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2490                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2491                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2492                                 continue;
 2493                         }
 2494 #endif
 2495                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2496                             (non_asoc_addr_ok == 0))
 2497                                 continue;
 2498                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 2499                             dest_is_loop,
 2500                             dest_is_priv, fam);
 2501                         if (sifa == NULL)
 2502                                 continue;
 2503                         if (sctp_is_addr_in_ep(inp, sifa)) {
 2504                                 atomic_add_int(&sifa->refcount, 1);
 2505                                 return (sifa);
 2506                         }
 2507                 }
 2508         }
 2509         /*
 2510          * ok, now we now need to find one on the list of the addresses. We
 2511          * can't get one on the emitting interface so let's find first a
 2512          * preferred one. If not that an acceptable one otherwise... we
 2513          * return NULL.
 2514          */
 2515         starting_point = inp->next_addr_touse;
 2516 once_again:
 2517         if (inp->next_addr_touse == NULL) {
 2518                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2519                 resettotop = 1;
 2520         }
 2521         for (laddr = inp->next_addr_touse; laddr;
 2522             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2523                 if (laddr->ifa == NULL) {
 2524                         /* address has been removed */
 2525                         continue;
 2526                 }
 2527                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2528                         /* address is being deleted */
 2529                         continue;
 2530                 }
 2531                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 2532                     dest_is_priv, fam);
 2533                 if (sifa == NULL)
 2534                         continue;
 2535                 atomic_add_int(&sifa->refcount, 1);
 2536                 return (sifa);
 2537         }
 2538         if (resettotop == 0) {
 2539                 inp->next_addr_touse = NULL;
 2540                 goto once_again;
 2541         }
 2542 
 2543         inp->next_addr_touse = starting_point;
 2544         resettotop = 0;
 2545 once_again_too:
 2546         if (inp->next_addr_touse == NULL) {
 2547                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2548                 resettotop = 1;
 2549         }
 2550 
 2551         /* ok, what about an acceptable address in the inp */
 2552         for (laddr = inp->next_addr_touse; laddr;
 2553             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2554                 if (laddr->ifa == NULL) {
 2555                         /* address has been removed */
 2556                         continue;
 2557                 }
 2558                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2559                         /* address is being deleted */
 2560                         continue;
 2561                 }
 2562                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2563                     dest_is_priv, fam);
 2564                 if (sifa == NULL)
 2565                         continue;
 2566                 atomic_add_int(&sifa->refcount, 1);
 2567                 return (sifa);
 2568         }
 2569         if (resettotop == 0) {
 2570                 inp->next_addr_touse = NULL;
 2571                 goto once_again_too;
 2572         }
 2573 
 2574         /*
 2575          * no address bound can be a source for the destination we are in
 2576          * trouble
 2577          */
 2578         return (NULL);
 2579 }
 2580 
 2581 static struct sctp_ifa *
 2582 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 2583     struct sctp_tcb *stcb,
 2584     sctp_route_t *ro,
 2585     uint32_t vrf_id,
 2586     uint8_t dest_is_priv,
 2587     uint8_t dest_is_loop,
 2588     int non_asoc_addr_ok,
 2589     sa_family_t fam)
 2590 {
 2591         struct sctp_laddr *laddr, *starting_point;
 2592         void *ifn;
 2593         struct sctp_ifn *sctp_ifn;
 2594         struct sctp_ifa *sctp_ifa, *sifa;
 2595         uint8_t start_at_beginning = 0;
 2596         struct sctp_vrf *vrf;
 2597         uint32_t ifn_index;
 2598 
 2599         /*
 2600          * first question, is the ifn we will emit on in our list, if so, we
 2601          * want that one.
 2602          */
 2603         vrf = sctp_find_vrf(vrf_id);
 2604         if (vrf == NULL)
 2605                 return (NULL);
 2606 
 2607         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2608         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2609         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2610 
 2611         /*
 2612          * first question, is the ifn we will emit on in our list?  If so,
 2613          * we want that one. First we look for a preferred. Second, we go
 2614          * for an acceptable.
 2615          */
 2616         if (sctp_ifn) {
 2617                 /* first try for a preferred address on the ep */
 2618                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2619 #ifdef INET
 2620                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2621                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2622                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2623                                 continue;
 2624                         }
 2625 #endif
 2626 #ifdef INET6
 2627                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2628                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2629                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2630                                 continue;
 2631                         }
 2632 #endif
 2633                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2634                                 continue;
 2635                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2636                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2637                                 if (sifa == NULL)
 2638                                         continue;
 2639                                 if (((non_asoc_addr_ok == 0) &&
 2640                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2641                                     (non_asoc_addr_ok &&
 2642                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2643                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2644                                         /* on the no-no list */
 2645                                         continue;
 2646                                 }
 2647                                 atomic_add_int(&sifa->refcount, 1);
 2648                                 return (sifa);
 2649                         }
 2650                 }
 2651                 /* next try for an acceptable address on the ep */
 2652                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2653 #ifdef INET
 2654                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2655                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2656                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2657                                 continue;
 2658                         }
 2659 #endif
 2660 #ifdef INET6
 2661                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2662                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2663                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2664                                 continue;
 2665                         }
 2666 #endif
 2667                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2668                                 continue;
 2669                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2670                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2671                                 if (sifa == NULL)
 2672                                         continue;
 2673                                 if (((non_asoc_addr_ok == 0) &&
 2674                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2675                                     (non_asoc_addr_ok &&
 2676                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2677                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2678                                         /* on the no-no list */
 2679                                         continue;
 2680                                 }
 2681                                 atomic_add_int(&sifa->refcount, 1);
 2682                                 return (sifa);
 2683                         }
 2684                 }
 2685         }
 2686         /*
 2687          * if we can't find one like that then we must look at all addresses
 2688          * bound to pick one at first preferable then secondly acceptable.
 2689          */
 2690         starting_point = stcb->asoc.last_used_address;
 2691 sctp_from_the_top:
 2692         if (stcb->asoc.last_used_address == NULL) {
 2693                 start_at_beginning = 1;
 2694                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2695         }
 2696         /* search beginning with the last used address */
 2697         for (laddr = stcb->asoc.last_used_address; laddr;
 2698             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2699                 if (laddr->ifa == NULL) {
 2700                         /* address has been removed */
 2701                         continue;
 2702                 }
 2703                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2704                         /* address is being deleted */
 2705                         continue;
 2706                 }
 2707                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 2708                 if (sifa == NULL)
 2709                         continue;
 2710                 if (((non_asoc_addr_ok == 0) &&
 2711                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2712                     (non_asoc_addr_ok &&
 2713                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2714                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2715                         /* on the no-no list */
 2716                         continue;
 2717                 }
 2718                 stcb->asoc.last_used_address = laddr;
 2719                 atomic_add_int(&sifa->refcount, 1);
 2720                 return (sifa);
 2721         }
 2722         if (start_at_beginning == 0) {
 2723                 stcb->asoc.last_used_address = NULL;
 2724                 goto sctp_from_the_top;
 2725         }
 2726         /* now try for any higher scope than the destination */
 2727         stcb->asoc.last_used_address = starting_point;
 2728         start_at_beginning = 0;
 2729 sctp_from_the_top2:
 2730         if (stcb->asoc.last_used_address == NULL) {
 2731                 start_at_beginning = 1;
 2732                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2733         }
 2734         /* search beginning with the last used address */
 2735         for (laddr = stcb->asoc.last_used_address; laddr;
 2736             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2737                 if (laddr->ifa == NULL) {
 2738                         /* address has been removed */
 2739                         continue;
 2740                 }
 2741                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2742                         /* address is being deleted */
 2743                         continue;
 2744                 }
 2745                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2746                     dest_is_priv, fam);
 2747                 if (sifa == NULL)
 2748                         continue;
 2749                 if (((non_asoc_addr_ok == 0) &&
 2750                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2751                     (non_asoc_addr_ok &&
 2752                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2753                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2754                         /* on the no-no list */
 2755                         continue;
 2756                 }
 2757                 stcb->asoc.last_used_address = laddr;
 2758                 atomic_add_int(&sifa->refcount, 1);
 2759                 return (sifa);
 2760         }
 2761         if (start_at_beginning == 0) {
 2762                 stcb->asoc.last_used_address = NULL;
 2763                 goto sctp_from_the_top2;
 2764         }
 2765         return (NULL);
 2766 }
 2767 
 2768 static struct sctp_ifa *
 2769 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 2770     struct sctp_inpcb *inp,
 2771     struct sctp_tcb *stcb,
 2772     int non_asoc_addr_ok,
 2773     uint8_t dest_is_loop,
 2774     uint8_t dest_is_priv,
 2775     int addr_wanted,
 2776     sa_family_t fam,
 2777     sctp_route_t *ro)
 2778 {
 2779         struct sctp_ifa *ifa, *sifa;
 2780         int num_eligible_addr = 0;
 2781 #ifdef INET6
 2782         struct sockaddr_in6 sin6, lsa6;
 2783 
 2784         if (fam == AF_INET6) {
 2785                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
 2786                 (void)sa6_recoverscope(&sin6);
 2787         }
 2788 #endif                          /* INET6 */
 2789         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2790 #ifdef INET
 2791                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2792                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2793                     &ifa->address.sin.sin_addr) != 0)) {
 2794                         continue;
 2795                 }
 2796 #endif
 2797 #ifdef INET6
 2798                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2799                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2800                     &ifa->address.sin6.sin6_addr) != 0)) {
 2801                         continue;
 2802                 }
 2803 #endif
 2804                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2805                     (non_asoc_addr_ok == 0))
 2806                         continue;
 2807                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2808                     dest_is_priv, fam);
 2809                 if (sifa == NULL)
 2810                         continue;
 2811 #ifdef INET6
 2812                 if (fam == AF_INET6 &&
 2813                     dest_is_loop &&
 2814                     sifa->src_is_loop && sifa->src_is_priv) {
 2815                         /*
 2816                          * don't allow fe80::1 to be a src on loop ::1, we
 2817                          * don't list it to the peer so we will get an
 2818                          * abort.
 2819                          */
 2820                         continue;
 2821                 }
 2822                 if (fam == AF_INET6 &&
 2823                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
 2824                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
 2825                         /*
 2826                          * link-local <-> link-local must belong to the same
 2827                          * scope.
 2828                          */
 2829                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
 2830                         (void)sa6_recoverscope(&lsa6);
 2831                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
 2832                                 continue;
 2833                         }
 2834                 }
 2835 #endif                          /* INET6 */
 2836 
 2837                 /*
 2838                  * Check if the IPv6 address matches to next-hop. In the
 2839                  * mobile case, old IPv6 address may be not deleted from the
 2840                  * interface. Then, the interface has previous and new
 2841                  * addresses.  We should use one corresponding to the
 2842                  * next-hop.  (by micchie)
 2843                  */
 2844 #ifdef INET6
 2845                 if (stcb && fam == AF_INET6 &&
 2846                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2847                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro) == 0) {
 2848                                 continue;
 2849                         }
 2850                 }
 2851 #endif
 2852 #ifdef INET
 2853                 /* Avoid topologically incorrect IPv4 address */
 2854                 if (stcb && fam == AF_INET &&
 2855                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2856                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 2857                                 continue;
 2858                         }
 2859                 }
 2860 #endif
 2861                 if (stcb) {
 2862                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2863                                 continue;
 2864                         }
 2865                         if (((non_asoc_addr_ok == 0) &&
 2866                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2867                             (non_asoc_addr_ok &&
 2868                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2869                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2870                                 /*
 2871                                  * It is restricted for some reason..
 2872                                  * probably not yet added.
 2873                                  */
 2874                                 continue;
 2875                         }
 2876                 }
 2877                 if (num_eligible_addr >= addr_wanted) {
 2878                         return (sifa);
 2879                 }
 2880                 num_eligible_addr++;
 2881         }
 2882         return (NULL);
 2883 }
 2884 
 2885 static int
 2886 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 2887     struct sctp_inpcb *inp,
 2888     struct sctp_tcb *stcb,
 2889     int non_asoc_addr_ok,
 2890     uint8_t dest_is_loop,
 2891     uint8_t dest_is_priv,
 2892     sa_family_t fam)
 2893 {
 2894         struct sctp_ifa *ifa, *sifa;
 2895         int num_eligible_addr = 0;
 2896 
 2897         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2898 #ifdef INET
 2899                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2900                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2901                     &ifa->address.sin.sin_addr) != 0)) {
 2902                         continue;
 2903                 }
 2904 #endif
 2905 #ifdef INET6
 2906                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2907                     (stcb != NULL) &&
 2908                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2909                     &ifa->address.sin6.sin6_addr) != 0)) {
 2910                         continue;
 2911                 }
 2912 #endif
 2913                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2914                     (non_asoc_addr_ok == 0)) {
 2915                         continue;
 2916                 }
 2917                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2918                     dest_is_priv, fam);
 2919                 if (sifa == NULL) {
 2920                         continue;
 2921                 }
 2922                 if (stcb) {
 2923                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2924                                 continue;
 2925                         }
 2926                         if (((non_asoc_addr_ok == 0) &&
 2927                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2928                             (non_asoc_addr_ok &&
 2929                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2930                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2931                                 /*
 2932                                  * It is restricted for some reason..
 2933                                  * probably not yet added.
 2934                                  */
 2935                                 continue;
 2936                         }
 2937                 }
 2938                 num_eligible_addr++;
 2939         }
 2940         return (num_eligible_addr);
 2941 }
 2942 
 2943 static struct sctp_ifa *
 2944 sctp_choose_boundall(struct sctp_inpcb *inp,
 2945     struct sctp_tcb *stcb,
 2946     struct sctp_nets *net,
 2947     sctp_route_t *ro,
 2948     uint32_t vrf_id,
 2949     uint8_t dest_is_priv,
 2950     uint8_t dest_is_loop,
 2951     int non_asoc_addr_ok,
 2952     sa_family_t fam)
 2953 {
 2954         int cur_addr_num = 0, num_preferred = 0;
 2955         void *ifn;
 2956         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 2957         struct sctp_ifa *sctp_ifa, *sifa;
 2958         uint32_t ifn_index;
 2959         struct sctp_vrf *vrf;
 2960 #ifdef INET
 2961         int retried = 0;
 2962 #endif
 2963 
 2964         /*-
 2965          * For boundall we can use any address in the association.
 2966          * If non_asoc_addr_ok is set we can use any address (at least in
 2967          * theory). So we look for preferred addresses first. If we find one,
 2968          * we use it. Otherwise we next try to get an address on the
 2969          * interface, which we should be able to do (unless non_asoc_addr_ok
 2970          * is false and we are routed out that way). In these cases where we
 2971          * can't use the address of the interface we go through all the
 2972          * ifn's looking for an address we can use and fill that in. Punting
 2973          * means we send back address 0, which will probably cause problems
 2974          * actually since then IP will fill in the address of the route ifn,
 2975          * which means we probably already rejected it.. i.e. here comes an
 2976          * abort :-<.
 2977          */
 2978         vrf = sctp_find_vrf(vrf_id);
 2979         if (vrf == NULL)
 2980                 return (NULL);
 2981 
 2982         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2983         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2984         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
 2985         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2986         if (sctp_ifn == NULL) {
 2987                 /* ?? We don't have this guy ?? */
 2988                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 2989                 goto bound_all_plan_b;
 2990         }
 2991         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 2992             ifn_index, sctp_ifn->ifn_name);
 2993 
 2994         if (net) {
 2995                 cur_addr_num = net->indx_of_eligible_next_to_use;
 2996         }
 2997         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 2998             inp, stcb,
 2999             non_asoc_addr_ok,
 3000             dest_is_loop,
 3001             dest_is_priv, fam);
 3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 3003             num_preferred, sctp_ifn->ifn_name);
 3004         if (num_preferred == 0) {
 3005                 /*
 3006                  * no eligible addresses, we must use some other interface
 3007                  * address if we can find one.
 3008                  */
 3009                 goto bound_all_plan_b;
 3010         }
 3011         /*
 3012          * Ok we have num_eligible_addr set with how many we can use, this
 3013          * may vary from call to call due to addresses being deprecated
 3014          * etc..
 3015          */
 3016         if (cur_addr_num >= num_preferred) {
 3017                 cur_addr_num = 0;
 3018         }
 3019         /*
 3020          * select the nth address from the list (where cur_addr_num is the
 3021          * nth) and 0 is the first one, 1 is the second one etc...
 3022          */
 3023         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 3024 
 3025         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3026             dest_is_priv, cur_addr_num, fam, ro);
 3027 
 3028         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 3029         if (sctp_ifa) {
 3030                 atomic_add_int(&sctp_ifa->refcount, 1);
 3031                 if (net) {
 3032                         /* save off where the next one we will want */
 3033                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3034                 }
 3035                 return (sctp_ifa);
 3036         }
 3037         /*
 3038          * plan_b: Look at all interfaces and find a preferred address. If
 3039          * no preferred fall through to plan_c.
 3040          */
 3041 bound_all_plan_b:
 3042         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 3043         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3044                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 3045                     sctp_ifn->ifn_name);
 3046                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3047                         /* wrong base scope */
 3048                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 3049                         continue;
 3050                 }
 3051                 if ((sctp_ifn == looked_at) && looked_at) {
 3052                         /* already looked at this guy */
 3053                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 3054                         continue;
 3055                 }
 3056                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
 3057                     dest_is_loop, dest_is_priv, fam);
 3058                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3059                     "Found ifn:%p %d preferred source addresses\n",
 3060                     ifn, num_preferred);
 3061                 if (num_preferred == 0) {
 3062                         /* None on this interface. */
 3063                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No preferred -- skipping to next\n");
 3064                         continue;
 3065                 }
 3066                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3067                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 3068                     num_preferred, (void *)sctp_ifn, cur_addr_num);
 3069 
 3070                 /*
 3071                  * Ok we have num_eligible_addr set with how many we can
 3072                  * use, this may vary from call to call due to addresses
 3073                  * being deprecated etc..
 3074                  */
 3075                 if (cur_addr_num >= num_preferred) {
 3076                         cur_addr_num = 0;
 3077                 }
 3078                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3079                     dest_is_priv, cur_addr_num, fam, ro);
 3080                 if (sifa == NULL)
 3081                         continue;
 3082                 if (net) {
 3083                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3084                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 3085                             cur_addr_num);
 3086                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 3087                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 3088                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 3089                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 3090                 }
 3091                 atomic_add_int(&sifa->refcount, 1);
 3092                 return (sifa);
 3093         }
 3094 #ifdef INET
 3095 again_with_private_addresses_allowed:
 3096 #endif
 3097         /* plan_c: do we have an acceptable address on the emit interface */
 3098         sifa = NULL;
 3099         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 3100         if (emit_ifn == NULL) {
 3101                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
 3102                 goto plan_d;
 3103         }
 3104         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 3105                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
 3106 #ifdef INET
 3107                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3108                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3109                     &sctp_ifa->address.sin.sin_addr) != 0)) {
 3110                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3111                         continue;
 3112                 }
 3113 #endif
 3114 #ifdef INET6
 3115                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3116                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3117                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3118                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3119                         continue;
 3120                 }
 3121 #endif
 3122                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3123                     (non_asoc_addr_ok == 0)) {
 3124                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
 3125                         continue;
 3126                 }
 3127                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 3128                     dest_is_priv, fam);
 3129                 if (sifa == NULL) {
 3130                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
 3131                         continue;
 3132                 }
 3133                 if (stcb) {
 3134                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3135                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
 3136                                 sifa = NULL;
 3137                                 continue;
 3138                         }
 3139                         if (((non_asoc_addr_ok == 0) &&
 3140                             (sctp_is_addr_restricted(stcb, sifa))) ||
 3141                             (non_asoc_addr_ok &&
 3142                             (sctp_is_addr_restricted(stcb, sifa)) &&
 3143                             (!sctp_is_addr_pending(stcb, sifa)))) {
 3144                                 /*
 3145                                  * It is restricted for some reason..
 3146                                  * probably not yet added.
 3147                                  */
 3148                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its restricted\n");
 3149                                 sifa = NULL;
 3150                                 continue;
 3151                         }
 3152                 }
 3153                 atomic_add_int(&sifa->refcount, 1);
 3154                 goto out;
 3155         }
 3156 plan_d:
 3157         /*
 3158          * plan_d: We are in trouble. No preferred address on the emit
 3159          * interface. And not even a preferred address on all interfaces. Go
 3160          * out and see if we can find an acceptable address somewhere
 3161          * amongst all interfaces.
 3162          */
 3163         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
 3164         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3165                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3166                         /* wrong base scope */
 3167                         continue;
 3168                 }
 3169                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3170 #ifdef INET
 3171                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3172                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3173                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3174                                 continue;
 3175                         }
 3176 #endif
 3177 #ifdef INET6
 3178                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3179                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3180                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3181                                 continue;
 3182                         }
 3183 #endif
 3184                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3185                             (non_asoc_addr_ok == 0))
 3186                                 continue;
 3187                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3188                             dest_is_loop,
 3189                             dest_is_priv, fam);
 3190                         if (sifa == NULL)
 3191                                 continue;
 3192                         if (stcb) {
 3193                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3194                                         sifa = NULL;
 3195                                         continue;
 3196                                 }
 3197                                 if (((non_asoc_addr_ok == 0) &&
 3198                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 3199                                     (non_asoc_addr_ok &&
 3200                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 3201                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 3202                                         /*
 3203                                          * It is restricted for some
 3204                                          * reason.. probably not yet added.
 3205                                          */
 3206                                         sifa = NULL;
 3207                                         continue;
 3208                                 }
 3209                         }
 3210                         goto out;
 3211                 }
 3212         }
 3213 #ifdef INET
 3214         if (stcb) {
 3215                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
 3216                         stcb->asoc.scope.ipv4_local_scope = 1;
 3217                         retried = 1;
 3218                         goto again_with_private_addresses_allowed;
 3219                 } else if (retried == 1) {
 3220                         stcb->asoc.scope.ipv4_local_scope = 0;
 3221                 }
 3222         }
 3223 #endif
 3224 out:
 3225 #ifdef INET
 3226         if (sifa) {
 3227                 if (retried == 1) {
 3228                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3229                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3230                                         /* wrong base scope */
 3231                                         continue;
 3232                                 }
 3233                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3234                                         struct sctp_ifa *tmp_sifa;
 3235 
 3236 #ifdef INET
 3237                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3238                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3239                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3240                                                 continue;
 3241                                         }
 3242 #endif
 3243 #ifdef INET6
 3244                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3245                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3246                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3247                                                 continue;
 3248                                         }
 3249 #endif
 3250                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3251                                             (non_asoc_addr_ok == 0))
 3252                                                 continue;
 3253                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3254                                             dest_is_loop,
 3255                                             dest_is_priv, fam);
 3256                                         if (tmp_sifa == NULL) {
 3257                                                 continue;
 3258                                         }
 3259                                         if (tmp_sifa == sifa) {
 3260                                                 continue;
 3261                                         }
 3262                                         if (stcb) {
 3263                                                 if (sctp_is_address_in_scope(tmp_sifa,
 3264                                                     &stcb->asoc.scope, 0) == 0) {
 3265                                                         continue;
 3266                                                 }
 3267                                                 if (((non_asoc_addr_ok == 0) &&
 3268                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
 3269                                                     (non_asoc_addr_ok &&
 3270                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
 3271                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
 3272                                                         /*
 3273                                                          * It is restricted
 3274                                                          * for some reason..
 3275                                                          * probably not yet
 3276                                                          * added.
 3277                                                          */
 3278                                                         continue;
 3279                                                 }
 3280                                         }
 3281                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
 3282                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
 3283                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
 3284                                         }
 3285                                 }
 3286                         }
 3287                 }
 3288                 atomic_add_int(&sifa->refcount, 1);
 3289         }
 3290 #endif
 3291         return (sifa);
 3292 }
 3293 
 3294 /* tcb may be NULL */
 3295 struct sctp_ifa *
 3296 sctp_source_address_selection(struct sctp_inpcb *inp,
 3297     struct sctp_tcb *stcb,
 3298     sctp_route_t *ro,
 3299     struct sctp_nets *net,
 3300     int non_asoc_addr_ok, uint32_t vrf_id)
 3301 {
 3302         struct sctp_ifa *answer;
 3303         uint8_t dest_is_priv, dest_is_loop;
 3304         sa_family_t fam;
 3305 #ifdef INET
 3306         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 3307 #endif
 3308 #ifdef INET6
 3309         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 3310 #endif
 3311 
 3312         /**
 3313          * Rules:
 3314          * - Find the route if needed, cache if I can.
 3315          * - Look at interface address in route, Is it in the bound list. If so we
 3316          *   have the best source.
 3317          * - If not we must rotate amongst the addresses.
 3318          *
 3319          * Caveats and issues
 3320          *
 3321          * Do we need to pay attention to scope. We can have a private address
 3322          * or a global address we are sourcing or sending to. So if we draw
 3323          * it out
 3324          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3325          * For V4
 3326          * ------------------------------------------
 3327          *      source     *      dest  *  result
 3328          * -----------------------------------------
 3329          * <a>  Private    *    Global  *  NAT
 3330          * -----------------------------------------
 3331          * <b>  Private    *    Private *  No problem
 3332          * -----------------------------------------
 3333          * <c>  Global     *    Private *  Huh, How will this work?
 3334          * -----------------------------------------
 3335          * <d>  Global     *    Global  *  No Problem
 3336          *------------------------------------------
 3337          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3338          * For V6
 3339          *------------------------------------------
 3340          *      source     *      dest  *  result
 3341          * -----------------------------------------
 3342          * <a>  Linklocal  *    Global  *
 3343          * -----------------------------------------
 3344          * <b>  Linklocal  * Linklocal  *  No problem
 3345          * -----------------------------------------
 3346          * <c>  Global     * Linklocal  *  Huh, How will this work?
 3347          * -----------------------------------------
 3348          * <d>  Global     *    Global  *  No Problem
 3349          *------------------------------------------
 3350          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3351          *
 3352          * And then we add to that what happens if there are multiple addresses
 3353          * assigned to an interface. Remember the ifa on a ifn is a linked
 3354          * list of addresses. So one interface can have more than one IP
 3355          * address. What happens if we have both a private and a global
 3356          * address? Do we then use context of destination to sort out which
 3357          * one is best? And what about NAT's sending P->G may get you a NAT
 3358          * translation, or should you select the G thats on the interface in
 3359          * preference.
 3360          *
 3361          * Decisions:
 3362          *
 3363          * - count the number of addresses on the interface.
 3364          * - if it is one, no problem except case <c>.
 3365          *   For <a> we will assume a NAT out there.
 3366          * - if there are more than one, then we need to worry about scope P
 3367          *   or G. We should prefer G -> G and P -> P if possible.
 3368          *   Then as a secondary fall back to mixed types G->P being a last
 3369          *   ditch one.
 3370          * - The above all works for bound all, but bound specific we need to
 3371          *   use the same concept but instead only consider the bound
 3372          *   addresses. If the bound set is NOT assigned to the interface then
 3373          *   we must use rotation amongst the bound addresses..
 3374          */
 3375         if (ro->ro_nh == NULL) {
 3376                 /*
 3377                  * Need a route to cache.
 3378                  */
 3379                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 3380         }
 3381         if (ro->ro_nh == NULL) {
 3382                 return (NULL);
 3383         }
 3384         fam = ro->ro_dst.sa_family;
 3385         dest_is_priv = dest_is_loop = 0;
 3386         /* Setup our scopes for the destination */
 3387         switch (fam) {
 3388 #ifdef INET
 3389         case AF_INET:
 3390                 /* Scope based on outbound address */
 3391                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 3392                         dest_is_loop = 1;
 3393                         if (net != NULL) {
 3394                                 /* mark it as local */
 3395                                 net->addr_is_local = 1;
 3396                         }
 3397                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 3398                         dest_is_priv = 1;
 3399                 }
 3400                 break;
 3401 #endif
 3402 #ifdef INET6
 3403         case AF_INET6:
 3404                 /* Scope based on outbound address */
 3405                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
 3406                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
 3407                         /*
 3408                          * If the address is a loopback address, which
 3409                          * consists of "::1" OR "fe80::1%lo0", we are
 3410                          * loopback scope. But we don't use dest_is_priv
 3411                          * (link local addresses).
 3412                          */
 3413                         dest_is_loop = 1;
 3414                         if (net != NULL) {
 3415                                 /* mark it as local */
 3416                                 net->addr_is_local = 1;
 3417                         }
 3418                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 3419                         dest_is_priv = 1;
 3420                 }
 3421                 break;
 3422 #endif
 3423         }
 3424         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 3425         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
 3426         SCTP_IPI_ADDR_RLOCK();
 3427         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3428                 /*
 3429                  * Bound all case
 3430                  */
 3431                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 3432                     dest_is_priv, dest_is_loop,
 3433                     non_asoc_addr_ok, fam);
 3434                 SCTP_IPI_ADDR_RUNLOCK();
 3435                 return (answer);
 3436         }
 3437         /*
 3438          * Subset bound case
 3439          */
 3440         if (stcb) {
 3441                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
 3442                     vrf_id, dest_is_priv,
 3443                     dest_is_loop,
 3444                     non_asoc_addr_ok, fam);
 3445         } else {
 3446                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 3447                     non_asoc_addr_ok,
 3448                     dest_is_priv,
 3449                     dest_is_loop, fam);
 3450         }
 3451         SCTP_IPI_ADDR_RUNLOCK();
 3452         return (answer);
 3453 }
 3454 
 3455 static bool
 3456 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
 3457 {
 3458         struct cmsghdr cmh;
 3459         struct sctp_sndinfo sndinfo;
 3460         struct sctp_prinfo prinfo;
 3461         struct sctp_authinfo authinfo;
 3462         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3463         bool found;
 3464 
 3465         /*
 3466          * Independent of how many mbufs, find the c_type inside the control
 3467          * structure and copy out the data.
 3468          */
 3469         found = false;
 3470         tot_len = SCTP_BUF_LEN(control);
 3471         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3472                 rem_len = tot_len - off;
 3473                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3474                         /* There is not enough room for one more. */
 3475                         return (found);
 3476                 }
 3477                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3478                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3479                         /* We dont't have a complete CMSG header. */
 3480                         return (found);
 3481                 }
 3482                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3483                         /* We don't have the complete CMSG. */
 3484                         return (found);
 3485                 }
 3486                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3487                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3488                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 3489                     ((c_type == cmh.cmsg_type) ||
 3490                     ((c_type == SCTP_SNDRCV) &&
 3491                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
 3492                     (cmh.cmsg_type == SCTP_PRINFO) ||
 3493                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
 3494                         if (c_type == cmh.cmsg_type) {
 3495                                 if (cpsize > INT_MAX) {
 3496                                         return (found);
 3497                                 }
 3498                                 if (cmsg_data_len < (int)cpsize) {
 3499                                         return (found);
 3500                                 }
 3501                                 /* It is exactly what we want. Copy it out. */
 3502                                 m_copydata(control, cmsg_data_off, (int)cpsize, (caddr_t)data);
 3503                                 return (1);
 3504                         } else {
 3505                                 struct sctp_sndrcvinfo *sndrcvinfo;
 3506 
 3507                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
 3508                                 if (!found) {
 3509                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
 3510                                                 return (found);
 3511                                         }
 3512                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
 3513                                 }
 3514                                 switch (cmh.cmsg_type) {
 3515                                 case SCTP_SNDINFO:
 3516                                         if (cmsg_data_len < (int)sizeof(struct sctp_sndinfo)) {
 3517                                                 return (found);
 3518                                         }
 3519                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
 3520                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
 3521                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
 3522                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
 3523                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
 3524                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
 3525                                         break;
 3526                                 case SCTP_PRINFO:
 3527                                         if (cmsg_data_len < (int)sizeof(struct sctp_prinfo)) {
 3528                                                 return (found);
 3529                                         }
 3530                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
 3531                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
 3532                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
 3533                                         } else {
 3534                                                 sndrcvinfo->sinfo_timetolive = 0;
 3535                                         }
 3536                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
 3537                                         break;
 3538                                 case SCTP_AUTHINFO:
 3539                                         if (cmsg_data_len < (int)sizeof(struct sctp_authinfo)) {
 3540                                                 return (found);
 3541                                         }
 3542                                         m_copydata(control, cmsg_data_off, sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
 3543                                         sndrcvinfo->sinfo_keynumber_valid = 1;
 3544                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
 3545                                         break;
 3546                                 default:
 3547                                         return (found);
 3548                                 }
 3549                                 found = true;
 3550                         }
 3551                 }
 3552         }
 3553         return (found);
 3554 }
 3555 
 3556 static int
 3557 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
 3558 {
 3559         struct cmsghdr cmh;
 3560         struct sctp_initmsg initmsg;
 3561 #ifdef INET
 3562         struct sockaddr_in sin;
 3563 #endif
 3564 #ifdef INET6
 3565         struct sockaddr_in6 sin6;
 3566 #endif
 3567         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3568 
 3569         tot_len = SCTP_BUF_LEN(control);
 3570         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3571                 rem_len = tot_len - off;
 3572                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3573                         /* There is not enough room for one more. */
 3574                         *error = EINVAL;
 3575                         return (1);
 3576                 }
 3577                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3578                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3579                         /* We dont't have a complete CMSG header. */
 3580                         *error = EINVAL;
 3581                         return (1);
 3582                 }
 3583                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3584                         /* We don't have the complete CMSG. */
 3585                         *error = EINVAL;
 3586                         return (1);
 3587                 }
 3588                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3589                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3590                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3591                         switch (cmh.cmsg_type) {
 3592                         case SCTP_INIT:
 3593                                 if (cmsg_data_len < (int)sizeof(struct sctp_initmsg)) {
 3594                                         *error = EINVAL;
 3595                                         return (1);
 3596                                 }
 3597                                 m_copydata(control, cmsg_data_off, sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
 3598                                 if (initmsg.sinit_max_attempts)
 3599                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
 3600                                 if (initmsg.sinit_num_ostreams)
 3601                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
 3602                                 if (initmsg.sinit_max_instreams)
 3603                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
 3604                                 if (initmsg.sinit_max_init_timeo)
 3605                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
 3606                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
 3607                                         struct sctp_stream_out *tmp_str;
 3608                                         unsigned int i;
 3609 #if defined(SCTP_DETAILED_STR_STATS)
 3610                                         int j;
 3611 #endif
 3612 
 3613                                         /* Default is NOT correct */
 3614                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
 3615                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
 3616                                         SCTP_TCB_UNLOCK(stcb);
 3617                                         SCTP_MALLOC(tmp_str,
 3618                                             struct sctp_stream_out *,
 3619                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
 3620                                             SCTP_M_STRMO);
 3621                                         SCTP_TCB_LOCK(stcb);
 3622                                         if (tmp_str != NULL) {
 3623                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
 3624                                                 stcb->asoc.strmout = tmp_str;
 3625                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
 3626                                         } else {
 3627                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
 3628                                         }
 3629                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3630                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
 3631                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
 3632                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
 3633 #if defined(SCTP_DETAILED_STR_STATS)
 3634                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 3635                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
 3636                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
 3637                                                 }
 3638 #else
 3639                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
 3640                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
 3641 #endif
 3642                                                 stcb->asoc.strmout[i].next_mid_ordered = 0;
 3643                                                 stcb->asoc.strmout[i].next_mid_unordered = 0;
 3644                                                 stcb->asoc.strmout[i].sid = i;
 3645                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
 3646                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
 3647                                         }
 3648                                 }
 3649                                 break;
 3650 #ifdef INET
 3651                         case SCTP_DSTADDRV4:
 3652                                 if (cmsg_data_len < (int)sizeof(struct in_addr)) {
 3653                                         *error = EINVAL;
 3654                                         return (1);
 3655                                 }
 3656                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3657                                 sin.sin_family = AF_INET;
 3658                                 sin.sin_len = sizeof(struct sockaddr_in);
 3659                                 sin.sin_port = stcb->rport;
 3660                                 m_copydata(control, cmsg_data_off, sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3661                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3662                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3663                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3664                                         *error = EINVAL;
 3665                                         return (1);
 3666                                 }
 3667                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3668                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3669                                         *error = ENOBUFS;
 3670                                         return (1);
 3671                                 }
 3672                                 break;
 3673 #endif
 3674 #ifdef INET6
 3675                         case SCTP_DSTADDRV6:
 3676                                 if (cmsg_data_len < (int)sizeof(struct in6_addr)) {
 3677                                         *error = EINVAL;
 3678                                         return (1);
 3679                                 }
 3680                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3681                                 sin6.sin6_family = AF_INET6;
 3682                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3683                                 sin6.sin6_port = stcb->rport;
 3684                                 m_copydata(control, cmsg_data_off, sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3685                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
 3686                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
 3687                                         *error = EINVAL;
 3688                                         return (1);
 3689                                 }
 3690 #ifdef INET
 3691                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3692                                         in6_sin6_2_sin(&sin, &sin6);
 3693                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3694                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3695                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3696                                                 *error = EINVAL;
 3697                                                 return (1);
 3698                                         }
 3699                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL, stcb->asoc.port,
 3700                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3701                                                 *error = ENOBUFS;
 3702                                                 return (1);
 3703                                         }
 3704                                 } else
 3705 #endif
 3706                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL, stcb->asoc.port,
 3707                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3708                                         *error = ENOBUFS;
 3709                                         return (1);
 3710                                 }
 3711                                 break;
 3712 #endif
 3713                         default:
 3714                                 break;
 3715                         }
 3716                 }
 3717         }
 3718         return (0);
 3719 }
 3720 
 3721 #if defined(INET) || defined(INET6)
 3722 static struct sctp_tcb *
 3723 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
 3724     uint16_t port,
 3725     struct mbuf *control,
 3726     struct sctp_nets **net_p,
 3727     int *error)
 3728 {
 3729         struct cmsghdr cmh;
 3730         struct sctp_tcb *stcb;
 3731         struct sockaddr *addr;
 3732 #ifdef INET
 3733         struct sockaddr_in sin;
 3734 #endif
 3735 #ifdef INET6
 3736         struct sockaddr_in6 sin6;
 3737 #endif
 3738         int tot_len, rem_len, cmsg_data_len, cmsg_data_off, off;
 3739 
 3740         tot_len = SCTP_BUF_LEN(control);
 3741         for (off = 0; off < tot_len; off += CMSG_ALIGN(cmh.cmsg_len)) {
 3742                 rem_len = tot_len - off;
 3743                 if (rem_len < (int)CMSG_ALIGN(sizeof(cmh))) {
 3744                         /* There is not enough room for one more. */
 3745                         *error = EINVAL;
 3746                         return (NULL);
 3747                 }
 3748                 m_copydata(control, off, sizeof(cmh), (caddr_t)&cmh);
 3749                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3750                         /* We dont't have a complete CMSG header. */
 3751                         *error = EINVAL;
 3752                         return (NULL);
 3753                 }
 3754                 if ((cmh.cmsg_len > INT_MAX) || ((int)cmh.cmsg_len > rem_len)) {
 3755                         /* We don't have the complete CMSG. */
 3756                         *error = EINVAL;
 3757                         return (NULL);
 3758                 }
 3759                 cmsg_data_len = (int)cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh));
 3760                 cmsg_data_off = off + CMSG_ALIGN(sizeof(cmh));
 3761                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3762                         switch (cmh.cmsg_type) {
 3763 #ifdef INET
 3764                         case SCTP_DSTADDRV4:
 3765                                 if (cmsg_data_len < (int)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, cmsg_data_off, 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 (cmsg_data_len < (int)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, cmsg_data_off, 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         }
 3809         return (NULL);
 3810 }
 3811 #endif
 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         uint16_t cookie_sz;
 3821 
 3822         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 3823             sizeof(struct sctp_paramhdr)), 0,
 3824             M_NOWAIT, 1, MT_DATA);
 3825         if (mret == NULL) {
 3826                 return (NULL);
 3827         }
 3828         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
 3829         if (copy_init == NULL) {
 3830                 sctp_m_freem(mret);
 3831                 return (NULL);
 3832         }
 3833 #ifdef SCTP_MBUF_LOGGING
 3834         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3835                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
 3836         }
 3837 #endif
 3838         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 3839             M_NOWAIT);
 3840         if (copy_initack == NULL) {
 3841                 sctp_m_freem(mret);
 3842                 sctp_m_freem(copy_init);
 3843                 return (NULL);
 3844         }
 3845 #ifdef SCTP_MBUF_LOGGING
 3846         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3847                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
 3848         }
 3849 #endif
 3850         /* easy side we just drop it on the end */
 3851         ph = mtod(mret, struct sctp_paramhdr *);
 3852         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 3853             sizeof(struct sctp_paramhdr);
 3854         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 3855             sizeof(struct sctp_paramhdr));
 3856         ph->param_type = htons(SCTP_STATE_COOKIE);
 3857         ph->param_length = 0;   /* fill in at the end */
 3858         /* Fill in the stc cookie data */
 3859         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 3860 
 3861         /* tack the INIT and then the INIT-ACK onto the chain */
 3862         cookie_sz = 0;
 3863         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3864                 cookie_sz += SCTP_BUF_LEN(m_at);
 3865                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3866                         SCTP_BUF_NEXT(m_at) = copy_init;
 3867                         break;
 3868                 }
 3869         }
 3870         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3871                 cookie_sz += SCTP_BUF_LEN(m_at);
 3872                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3873                         SCTP_BUF_NEXT(m_at) = copy_initack;
 3874                         break;
 3875                 }
 3876         }
 3877         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3878                 cookie_sz += SCTP_BUF_LEN(m_at);
 3879                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3880                         break;
 3881                 }
 3882         }
 3883         sig = sctp_get_mbuf_for_msg(SCTP_SIGNATURE_SIZE, 0, M_NOWAIT, 1, MT_DATA);
 3884         if (sig == NULL) {
 3885                 /* no space, so free the entire chain */
 3886                 sctp_m_freem(mret);
 3887                 return (NULL);
 3888         }
 3889         SCTP_BUF_NEXT(m_at) = sig;
 3890         SCTP_BUF_LEN(sig) = SCTP_SIGNATURE_SIZE;
 3891         cookie_sz += SCTP_SIGNATURE_SIZE;
 3892         ph->param_length = htons(cookie_sz);
 3893         *signature = (uint8_t *)mtod(sig, caddr_t);
 3894         memset(*signature, 0, SCTP_SIGNATURE_SIZE);
 3895         return (mret);
 3896 }
 3897 
 3898 static uint8_t
 3899 sctp_get_ect(struct sctp_tcb *stcb)
 3900 {
 3901         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
 3902                 return (SCTP_ECT0_BIT);
 3903         } else {
 3904                 return (0);
 3905         }
 3906 }
 3907 
 3908 #if defined(INET) || defined(INET6)
 3909 static void
 3910 sctp_handle_no_route(struct sctp_tcb *stcb,
 3911     struct sctp_nets *net,
 3912     int so_locked)
 3913 {
 3914         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
 3915 
 3916         if (net) {
 3917                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
 3918                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
 3919                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 3920                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 3921                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
 3922                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 3923                                     stcb, 0,
 3924                                     (void *)net,
 3925                                     so_locked);
 3926                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 3927                                 net->dest_state &= ~SCTP_ADDR_PF;
 3928                         }
 3929                 }
 3930                 if (stcb) {
 3931                         if (net == stcb->asoc.primary_destination) {
 3932                                 /* need a new primary */
 3933                                 struct sctp_nets *alt;
 3934 
 3935                                 alt = sctp_find_alternate_net(stcb, net, 0);
 3936                                 if (alt != net) {
 3937                                         if (stcb->asoc.alternate) {
 3938                                                 sctp_free_remote_addr(stcb->asoc.alternate);
 3939                                         }
 3940                                         stcb->asoc.alternate = alt;
 3941                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 3942                                         if (net->ro._s_addr) {
 3943                                                 sctp_free_ifa(net->ro._s_addr);
 3944                                                 net->ro._s_addr = NULL;
 3945                                         }
 3946                                         net->src_addr_selected = 0;
 3947                                 }
 3948                         }
 3949                 }
 3950         }
 3951 }
 3952 #endif
 3953 
 3954 static int
 3955 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 3956     struct sctp_tcb *stcb,      /* may be NULL */
 3957     struct sctp_nets *net,
 3958     struct sockaddr *to,
 3959     struct mbuf *m,
 3960     uint32_t auth_offset,
 3961     struct sctp_auth_chunk *auth,
 3962     uint16_t auth_keyid,
 3963     int nofragment_flag,
 3964     int ecn_ok,
 3965     int out_of_asoc_ok,
 3966     uint16_t src_port,
 3967     uint16_t dest_port,
 3968     uint32_t v_tag,
 3969     uint16_t port,
 3970     union sctp_sockstore *over_addr,
 3971     uint8_t mflowtype, uint32_t mflowid,
 3972     int so_locked)
 3973 {
 3974 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 3975         /**
 3976          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
 3977          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
 3978          * - fill in the HMAC digest of any AUTH chunk in the packet.
 3979          * - calculate and fill in the SCTP checksum.
 3980          * - prepend an IP address header.
 3981          * - if boundall use INADDR_ANY.
 3982          * - if boundspecific do source address selection.
 3983          * - set fragmentation option for ipV4.
 3984          * - On return from IP output, check/adjust mtu size of output
 3985          *   interface and smallest_mtu size as well.
 3986          */
 3987         /* Will need ifdefs around this */
 3988         struct mbuf *newm;
 3989         struct sctphdr *sctphdr;
 3990         int packet_length;
 3991         int ret;
 3992 #if defined(INET) || defined(INET6)
 3993         uint32_t vrf_id;
 3994 #endif
 3995 #if defined(INET) || defined(INET6)
 3996         struct mbuf *o_pak;
 3997         sctp_route_t *ro = NULL;
 3998         struct udphdr *udp = NULL;
 3999 #endif
 4000         uint8_t tos_value;
 4001 
 4002         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 4003                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4004                 sctp_m_freem(m);
 4005                 return (EFAULT);
 4006         }
 4007 #if defined(INET) || defined(INET6)
 4008         if (stcb) {
 4009                 vrf_id = stcb->asoc.vrf_id;
 4010         } else {
 4011                 vrf_id = inp->def_vrf_id;
 4012         }
 4013 #endif
 4014         /* fill in the HMAC digest for any AUTH chunk in the packet */
 4015         if ((auth != NULL) && (stcb != NULL)) {
 4016                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
 4017         }
 4018 
 4019         if (net) {
 4020                 tos_value = net->dscp;
 4021         } else if (stcb) {
 4022                 tos_value = stcb->asoc.default_dscp;
 4023         } else {
 4024                 tos_value = inp->sctp_ep.default_dscp;
 4025         }
 4026 
 4027         switch (to->sa_family) {
 4028 #ifdef INET
 4029         case AF_INET:
 4030                 {
 4031                         struct ip *ip = NULL;
 4032                         sctp_route_t iproute;
 4033                         int len;
 4034 
 4035                         len = SCTP_MIN_V4_OVERHEAD;
 4036                         if (port) {
 4037                                 len += sizeof(struct udphdr);
 4038                         }
 4039                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4040                         if (newm == NULL) {
 4041                                 sctp_m_freem(m);
 4042                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4043                                 return (ENOMEM);
 4044                         }
 4045                         SCTP_ALIGN_TO_END(newm, len);
 4046                         SCTP_BUF_LEN(newm) = len;
 4047                         SCTP_BUF_NEXT(newm) = m;
 4048                         m = newm;
 4049                         if (net != NULL) {
 4050                                 m->m_pkthdr.flowid = net->flowid;
 4051                                 M_HASHTYPE_SET(m, net->flowtype);
 4052                         } else {
 4053                                 m->m_pkthdr.flowid = mflowid;
 4054                                 M_HASHTYPE_SET(m, mflowtype);
 4055                         }
 4056                         packet_length = sctp_calculate_len(m);
 4057                         ip = mtod(m, struct ip *);
 4058                         ip->ip_v = IPVERSION;
 4059                         ip->ip_hl = (sizeof(struct ip) >> 2);
 4060                         if (tos_value == 0) {
 4061                                 /*
 4062                                  * This means especially, that it is not set
 4063                                  * at the SCTP layer. So use the value from
 4064                                  * the IP layer.
 4065                                  */
 4066                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
 4067                         }
 4068                         tos_value &= 0xfc;
 4069                         if (ecn_ok) {
 4070                                 tos_value |= sctp_get_ect(stcb);
 4071                         }
 4072                         if ((nofragment_flag) && (port == 0)) {
 4073                                 ip->ip_off = htons(IP_DF);
 4074                         } else {
 4075                                 ip->ip_off = htons(0);
 4076                         }
 4077                         /* FreeBSD has a function for ip_id's */
 4078                         ip_fillid(ip);
 4079 
 4080                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 4081                         ip->ip_len = htons(packet_length);
 4082                         ip->ip_tos = tos_value;
 4083                         if (port) {
 4084                                 ip->ip_p = IPPROTO_UDP;
 4085                         } else {
 4086                                 ip->ip_p = IPPROTO_SCTP;
 4087                         }
 4088                         ip->ip_sum = 0;
 4089                         if (net == NULL) {
 4090                                 ro = &iproute;
 4091                                 memset(&iproute, 0, sizeof(iproute));
 4092                                 memcpy(&ro->ro_dst, to, to->sa_len);
 4093                         } else {
 4094                                 ro = (sctp_route_t *)&net->ro;
 4095                         }
 4096                         /* Now the address selection part */
 4097                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 4098 
 4099                         /* call the routine to select the src address */
 4100                         if (net && out_of_asoc_ok == 0) {
 4101                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4102                                         sctp_free_ifa(net->ro._s_addr);
 4103                                         net->ro._s_addr = NULL;
 4104                                         net->src_addr_selected = 0;
 4105                                         RO_NHFREE(ro);
 4106                                 }
 4107                                 if (net->src_addr_selected == 0) {
 4108                                         /* Cache the source address */
 4109                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 4110                                             ro, net, 0,
 4111                                             vrf_id);
 4112                                         net->src_addr_selected = 1;
 4113                                 }
 4114                                 if (net->ro._s_addr == NULL) {
 4115                                         /* No route to host */
 4116                                         net->src_addr_selected = 0;
 4117                                         sctp_handle_no_route(stcb, net, so_locked);
 4118                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4119                                         sctp_m_freem(m);
 4120                                         return (EHOSTUNREACH);
 4121                                 }
 4122                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 4123                         } else {
 4124                                 if (over_addr == NULL) {
 4125                                         struct sctp_ifa *_lsrc;
 4126 
 4127                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4128                                             net,
 4129                                             out_of_asoc_ok,
 4130                                             vrf_id);
 4131                                         if (_lsrc == NULL) {
 4132                                                 sctp_handle_no_route(stcb, net, so_locked);
 4133                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4134                                                 sctp_m_freem(m);
 4135                                                 return (EHOSTUNREACH);
 4136                                         }
 4137                                         ip->ip_src = _lsrc->address.sin.sin_addr;
 4138                                         sctp_free_ifa(_lsrc);
 4139                                 } else {
 4140                                         ip->ip_src = over_addr->sin.sin_addr;
 4141                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4142                                 }
 4143                         }
 4144                         if (port) {
 4145                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4146                                         sctp_handle_no_route(stcb, net, so_locked);
 4147                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4148                                         sctp_m_freem(m);
 4149                                         return (EHOSTUNREACH);
 4150                                 }
 4151                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
 4152                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4153                                 udp->uh_dport = port;
 4154                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip)));
 4155                                 if (V_udp_cksum) {
 4156                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
 4157                                 } else {
 4158                                         udp->uh_sum = 0;
 4159                                 }
 4160                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4161                         } else {
 4162                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
 4163                         }
 4164 
 4165                         sctphdr->src_port = src_port;
 4166                         sctphdr->dest_port = dest_port;
 4167                         sctphdr->v_tag = v_tag;
 4168                         sctphdr->checksum = 0;
 4169 
 4170                         /*
 4171                          * If source address selection fails and we find no
 4172                          * route then the ip_output should fail as well with
 4173                          * a NO_ROUTE_TO_HOST type error. We probably should
 4174                          * catch that somewhere and abort the association
 4175                          * right away (assuming this is an INIT being sent).
 4176                          */
 4177                         if (ro->ro_nh == NULL) {
 4178                                 /*
 4179                                  * src addr selection failed to find a route
 4180                                  * (or valid source addr), so we can't get
 4181                                  * there from here (yet)!
 4182                                  */
 4183                                 sctp_handle_no_route(stcb, net, so_locked);
 4184                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4185                                 sctp_m_freem(m);
 4186                                 return (EHOSTUNREACH);
 4187                         }
 4188                         if (ro != &iproute) {
 4189                                 memcpy(&iproute, ro, sizeof(*ro));
 4190                         }
 4191                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 4192                             (uint32_t)(ntohl(ip->ip_src.s_addr)));
 4193                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 4194                             (uint32_t)(ntohl(ip->ip_dst.s_addr)));
 4195                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 4196                             (void *)ro->ro_nh);
 4197 
 4198                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4199                                 /* failed to prepend data, give up */
 4200                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4201                                 sctp_m_freem(m);
 4202                                 return (ENOMEM);
 4203                         }
 4204                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4205                         if (port) {
 4206                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
 4207                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4208                                 if (V_udp_cksum) {
 4209                                         SCTP_ENABLE_UDP_CSUM(o_pak);
 4210                                 }
 4211                         } else {
 4212                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
 4213                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4214                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4215                         }
 4216 #ifdef SCTP_PACKET_LOGGING
 4217                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4218                                 sctp_packet_log(o_pak);
 4219 #endif
 4220                         /* send it out.  table id is taken from stcb */
 4221                         SCTP_PROBE5(send, NULL, stcb, ip, stcb, sctphdr);
 4222                         SCTP_IP_OUTPUT(ret, o_pak, ro, inp, vrf_id);
 4223                         if (port) {
 4224                                 UDPSTAT_INC(udps_opackets);
 4225                         }
 4226                         SCTP_STAT_INCR(sctps_sendpackets);
 4227                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4228                         if (ret)
 4229                                 SCTP_STAT_INCR(sctps_senderrors);
 4230 
 4231                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 4232                         if (net == NULL) {
 4233                                 /* free tempy routes */
 4234                                 RO_NHFREE(ro);
 4235                         } else {
 4236                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
 4237                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
 4238                                         uint32_t mtu;
 4239 
 4240                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
 4241                                         if (mtu > 0) {
 4242                                                 if (net->port) {
 4243                                                         mtu -= sizeof(struct udphdr);
 4244                                                 }
 4245                                                 if (mtu < net->mtu) {
 4246                                                         net->mtu = mtu;
 4247                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
 4248                                                                 sctp_pathmtu_adjustment(stcb, mtu, true);
 4249                                                         }
 4250                                                 }
 4251                                         }
 4252                                 } else if (ro->ro_nh == NULL) {
 4253                                         /* route was freed */
 4254                                         if (net->ro._s_addr &&
 4255                                             net->src_addr_selected) {
 4256                                                 sctp_free_ifa(net->ro._s_addr);
 4257                                                 net->ro._s_addr = NULL;
 4258                                         }
 4259                                         net->src_addr_selected = 0;
 4260                                 }
 4261                         }
 4262                         return (ret);
 4263                 }
 4264 #endif
 4265 #ifdef INET6
 4266         case AF_INET6:
 4267                 {
 4268                         uint32_t flowlabel, flowinfo;
 4269                         struct ip6_hdr *ip6h;
 4270                         struct route_in6 ip6route;
 4271                         struct ifnet *ifp;
 4272                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 4273                         int prev_scope = 0;
 4274                         struct sockaddr_in6 lsa6_storage;
 4275                         int error;
 4276                         u_short prev_port = 0;
 4277                         int len;
 4278 
 4279                         if (net) {
 4280                                 flowlabel = net->flowlabel;
 4281                         } else if (stcb) {
 4282                                 flowlabel = stcb->asoc.default_flowlabel;
 4283                         } else {
 4284                                 flowlabel = inp->sctp_ep.default_flowlabel;
 4285                         }
 4286                         if (flowlabel == 0) {
 4287                                 /*
 4288                                  * This means especially, that it is not set
 4289                                  * at the SCTP layer. So use the value from
 4290                                  * the IP layer.
 4291                                  */
 4292                                 flowlabel = ntohl(((struct inpcb *)inp)->inp_flow);
 4293                         }
 4294                         flowlabel &= 0x000fffff;
 4295                         len = SCTP_MIN_OVERHEAD;
 4296                         if (port) {
 4297                                 len += sizeof(struct udphdr);
 4298                         }
 4299                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4300                         if (newm == NULL) {
 4301                                 sctp_m_freem(m);
 4302                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4303                                 return (ENOMEM);
 4304                         }
 4305                         SCTP_ALIGN_TO_END(newm, len);
 4306                         SCTP_BUF_LEN(newm) = len;
 4307                         SCTP_BUF_NEXT(newm) = m;
 4308                         m = newm;
 4309                         if (net != NULL) {
 4310                                 m->m_pkthdr.flowid = net->flowid;
 4311                                 M_HASHTYPE_SET(m, net->flowtype);
 4312                         } else {
 4313                                 m->m_pkthdr.flowid = mflowid;
 4314                                 M_HASHTYPE_SET(m, mflowtype);
 4315                         }
 4316                         packet_length = sctp_calculate_len(m);
 4317 
 4318                         ip6h = mtod(m, struct ip6_hdr *);
 4319                         /* protect *sin6 from overwrite */
 4320                         sin6 = (struct sockaddr_in6 *)to;
 4321                         tmp = *sin6;
 4322                         sin6 = &tmp;
 4323 
 4324                         /* KAME hack: embed scopeid */
 4325                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4326                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4327                                 sctp_m_freem(m);
 4328                                 return (EINVAL);
 4329                         }
 4330                         if (net == NULL) {
 4331                                 memset(&ip6route, 0, sizeof(ip6route));
 4332                                 ro = (sctp_route_t *)&ip6route;
 4333                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 4334                         } else {
 4335                                 ro = (sctp_route_t *)&net->ro;
 4336                         }
 4337                         /*
 4338                          * We assume here that inp_flow is in host byte
 4339                          * order within the TCB!
 4340                          */
 4341                         if (tos_value == 0) {
 4342                                 /*
 4343                                  * This means especially, that it is not set
 4344                                  * at the SCTP layer. So use the value from
 4345                                  * the IP layer.
 4346                                  */
 4347                                 tos_value = (ntohl(((struct inpcb *)inp)->inp_flow) >> 20) & 0xff;
 4348                         }
 4349                         tos_value &= 0xfc;
 4350                         if (ecn_ok) {
 4351                                 tos_value |= sctp_get_ect(stcb);
 4352                         }
 4353                         flowinfo = 0x06;
 4354                         flowinfo <<= 8;
 4355                         flowinfo |= tos_value;
 4356                         flowinfo <<= 20;
 4357                         flowinfo |= flowlabel;
 4358                         ip6h->ip6_flow = htonl(flowinfo);
 4359                         if (port) {
 4360                                 ip6h->ip6_nxt = IPPROTO_UDP;
 4361                         } else {
 4362                                 ip6h->ip6_nxt = IPPROTO_SCTP;
 4363                         }
 4364                         ip6h->ip6_plen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
 4365                         ip6h->ip6_dst = sin6->sin6_addr;
 4366 
 4367                         /*
 4368                          * Add SRC address selection here: we can only reuse
 4369                          * to a limited degree the kame src-addr-sel, since
 4370                          * we can try their selection but it may not be
 4371                          * bound.
 4372                          */
 4373                         memset(&lsa6_tmp, 0, sizeof(lsa6_tmp));
 4374                         lsa6_tmp.sin6_family = AF_INET6;
 4375                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 4376                         lsa6 = &lsa6_tmp;
 4377                         if (net && out_of_asoc_ok == 0) {
 4378                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4379                                         sctp_free_ifa(net->ro._s_addr);
 4380                                         net->ro._s_addr = NULL;
 4381                                         net->src_addr_selected = 0;
 4382                                         RO_NHFREE(ro);
 4383                                 }
 4384                                 if (net->src_addr_selected == 0) {
 4385                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4386                                         /* KAME hack: embed scopeid */
 4387                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4388                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4389                                                 sctp_m_freem(m);
 4390                                                 return (EINVAL);
 4391                                         }
 4392                                         /* Cache the source address */
 4393                                         net->ro._s_addr = sctp_source_address_selection(inp,
 4394                                             stcb,
 4395                                             ro,
 4396                                             net,
 4397                                             0,
 4398                                             vrf_id);
 4399                                         (void)sa6_recoverscope(sin6);
 4400                                         net->src_addr_selected = 1;
 4401                                 }
 4402                                 if (net->ro._s_addr == NULL) {
 4403                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 4404                                         net->src_addr_selected = 0;
 4405                                         sctp_handle_no_route(stcb, net, so_locked);
 4406                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4407                                         sctp_m_freem(m);
 4408                                         return (EHOSTUNREACH);
 4409                                 }
 4410                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 4411                         } else {
 4412                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 4413                                 /* KAME hack: embed scopeid */
 4414                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4415                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4416                                         sctp_m_freem(m);
 4417                                         return (EINVAL);
 4418                                 }
 4419                                 if (over_addr == NULL) {
 4420                                         struct sctp_ifa *_lsrc;
 4421 
 4422                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4423                                             net,
 4424                                             out_of_asoc_ok,
 4425                                             vrf_id);
 4426                                         if (_lsrc == NULL) {
 4427                                                 sctp_handle_no_route(stcb, net, so_locked);
 4428                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4429                                                 sctp_m_freem(m);
 4430                                                 return (EHOSTUNREACH);
 4431                                         }
 4432                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 4433                                         sctp_free_ifa(_lsrc);
 4434                                 } else {
 4435                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
 4436                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4437                                 }
 4438                                 (void)sa6_recoverscope(sin6);
 4439                         }
 4440                         lsa6->sin6_port = inp->sctp_lport;
 4441 
 4442                         if (ro->ro_nh == NULL) {
 4443                                 /*
 4444                                  * src addr selection failed to find a route
 4445                                  * (or valid source addr), so we can't get
 4446                                  * there from here!
 4447                                  */
 4448                                 sctp_handle_no_route(stcb, net, so_locked);
 4449                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4450                                 sctp_m_freem(m);
 4451                                 return (EHOSTUNREACH);
 4452                         }
 4453                         /*
 4454                          * XXX: sa6 may not have a valid sin6_scope_id in
 4455                          * the non-SCOPEDROUTING case.
 4456                          */
 4457                         memset(&lsa6_storage, 0, sizeof(lsa6_storage));
 4458                         lsa6_storage.sin6_family = AF_INET6;
 4459                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
 4460                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4461                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 4462                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 4463                                 sctp_m_freem(m);
 4464                                 return (error);
 4465                         }
 4466                         /* XXX */
 4467                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4468                         lsa6_storage.sin6_port = inp->sctp_lport;
 4469                         lsa6 = &lsa6_storage;
 4470                         ip6h->ip6_src = lsa6->sin6_addr;
 4471 
 4472                         if (port) {
 4473                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4474                                         sctp_handle_no_route(stcb, net, so_locked);
 4475                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4476                                         sctp_m_freem(m);
 4477                                         return (EHOSTUNREACH);
 4478                                 }
 4479                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4480                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4481                                 udp->uh_dport = port;
 4482                                 udp->uh_ulen = htons((uint16_t)(packet_length - sizeof(struct ip6_hdr)));
 4483                                 udp->uh_sum = 0;
 4484                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4485                         } else {
 4486                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4487                         }
 4488 
 4489                         sctphdr->src_port = src_port;
 4490                         sctphdr->dest_port = dest_port;
 4491                         sctphdr->v_tag = v_tag;
 4492                         sctphdr->checksum = 0;
 4493 
 4494                         /*
 4495                          * We set the hop limit now since there is a good
 4496                          * chance that our ro pointer is now filled
 4497                          */
 4498                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 4499                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4500 
 4501 #ifdef SCTP_DEBUG
 4502                         /* Copy to be sure something bad is not happening */
 4503                         sin6->sin6_addr = ip6h->ip6_dst;
 4504                         lsa6->sin6_addr = ip6h->ip6_src;
 4505 #endif
 4506 
 4507                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 4508                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 4509                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 4510                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 4511                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 4512                         if (net) {
 4513                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4514                                 /*
 4515                                  * preserve the port and scope for link
 4516                                  * local send
 4517                                  */
 4518                                 prev_scope = sin6->sin6_scope_id;
 4519                                 prev_port = sin6->sin6_port;
 4520                         }
 4521 
 4522                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4523                                 /* failed to prepend data, give up */
 4524                                 sctp_m_freem(m);
 4525                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4526                                 return (ENOMEM);
 4527                         }
 4528                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4529                         if (port) {
 4530                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
 4531                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4532                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 4533                                         udp->uh_sum = 0xffff;
 4534                                 }
 4535                         } else {
 4536                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
 4537                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4538                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4539                         }
 4540                         /* send it out. table id is taken from stcb */
 4541 #ifdef SCTP_PACKET_LOGGING
 4542                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4543                                 sctp_packet_log(o_pak);
 4544 #endif
 4545                         SCTP_PROBE5(send, NULL, stcb, ip6h, stcb, sctphdr);
 4546                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, inp, vrf_id);
 4547                         if (net) {
 4548                                 /* for link local this must be done */
 4549                                 sin6->sin6_scope_id = prev_scope;
 4550                                 sin6->sin6_port = prev_port;
 4551                         }
 4552                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 4553                         if (port) {
 4554                                 UDPSTAT_INC(udps_opackets);
 4555                         }
 4556                         SCTP_STAT_INCR(sctps_sendpackets);
 4557                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4558                         if (ret) {
 4559                                 SCTP_STAT_INCR(sctps_senderrors);
 4560                         }
 4561                         if (net == NULL) {
 4562                                 /* Now if we had a temp route free it */
 4563                                 RO_NHFREE(ro);
 4564                         } else {
 4565                                 /*
 4566                                  * PMTU check versus smallest asoc MTU goes
 4567                                  * here
 4568                                  */
 4569                                 if (ro->ro_nh == NULL) {
 4570                                         /* Route was freed */
 4571                                         if (net->ro._s_addr &&
 4572                                             net->src_addr_selected) {
 4573                                                 sctp_free_ifa(net->ro._s_addr);
 4574                                                 net->ro._s_addr = NULL;
 4575                                         }
 4576                                         net->src_addr_selected = 0;
 4577                                 }
 4578                                 if ((ro->ro_nh != NULL) && (net->ro._s_addr) &&
 4579                                     ((net->dest_state & SCTP_ADDR_NO_PMTUD) == 0)) {
 4580                                         uint32_t mtu;
 4581 
 4582                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_nh);
 4583                                         if (mtu > 0) {
 4584                                                 if (net->port) {
 4585                                                         mtu -= sizeof(struct udphdr);
 4586                                                 }
 4587                                                 if (mtu < net->mtu) {
 4588                                                         net->mtu = mtu;
 4589                                                         if ((stcb != NULL) && (stcb->asoc.smallest_mtu > mtu)) {
 4590                                                                 sctp_pathmtu_adjustment(stcb, mtu, false);
 4591                                                         }
 4592                                                 }
 4593                                         }
 4594                                 } else if (ifp != NULL) {
 4595                                         if ((ND_IFINFO(ifp)->linkmtu > 0) &&
 4596                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 4597                                                 sctp_pathmtu_adjustment(stcb, ND_IFINFO(ifp)->linkmtu, false);
 4598                                         }
 4599                                 }
 4600                         }
 4601                         return (ret);
 4602                 }
 4603 #endif
 4604         default:
 4605                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 4606                     ((struct sockaddr *)to)->sa_family);
 4607                 sctp_m_freem(m);
 4608                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4609                 return (EFAULT);
 4610         }
 4611 }
 4612 
 4613 void
 4614 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked)
 4615 {
 4616         struct mbuf *m, *m_last;
 4617         struct sctp_nets *net;
 4618         struct sctp_init_chunk *init;
 4619         struct sctp_supported_addr_param *sup_addr;
 4620         struct sctp_adaptation_layer_indication *ali;
 4621         struct sctp_supported_chunk_types_param *pr_supported;
 4622         struct sctp_paramhdr *ph;
 4623         int cnt_inits_to = 0;
 4624         int error;
 4625         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 4626 
 4627         /* INIT's always go to the primary (and usually ONLY address) */
 4628         net = stcb->asoc.primary_destination;
 4629         if (net == NULL) {
 4630                 net = TAILQ_FIRST(&stcb->asoc.nets);
 4631                 if (net == NULL) {
 4632                         /* TSNH */
 4633                         return;
 4634                 }
 4635                 /* we confirm any address we send an INIT to */
 4636                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4637                 (void)sctp_set_primary_addr(stcb, NULL, net);
 4638         } else {
 4639                 /* we confirm any address we send an INIT to */
 4640                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4641         }
 4642         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 4643 #ifdef INET6
 4644         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 4645                 /*
 4646                  * special hook, if we are sending to link local it will not
 4647                  * show up in our private address count.
 4648                  */
 4649                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
 4650                         cnt_inits_to = 1;
 4651         }
 4652 #endif
 4653         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 4654                 /* This case should not happen */
 4655                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 4656                 return;
 4657         }
 4658         /* start the INIT timer */
 4659         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 4660 
 4661         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
 4662         if (m == NULL) {
 4663                 /* No memory, INIT timer will re-attempt. */
 4664                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 4665                 return;
 4666         }
 4667         chunk_len = (uint16_t)sizeof(struct sctp_init_chunk);
 4668         padding_len = 0;
 4669         /* Now lets put the chunk header in place */
 4670         init = mtod(m, struct sctp_init_chunk *);
 4671         /* now the chunk header */
 4672         init->ch.chunk_type = SCTP_INITIATION;
 4673         init->ch.chunk_flags = 0;
 4674         /* fill in later from mbuf we build */
 4675         init->ch.chunk_length = 0;
 4676         /* place in my tag */
 4677         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
 4678         /* set up some of the credits. */
 4679         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
 4680             SCTP_MINIMAL_RWND));
 4681         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 4682         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 4683         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 4684 
 4685         /* Adaptation layer indication parameter */
 4686         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 4687                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 4688                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 4689                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 4690                 ali->ph.param_length = htons(parameter_len);
 4691                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 4692                 chunk_len += parameter_len;
 4693         }
 4694 
 4695         /* ECN parameter */
 4696         if (stcb->asoc.ecn_supported == 1) {
 4697                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4698                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4699                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 4700                 ph->param_length = htons(parameter_len);
 4701                 chunk_len += parameter_len;
 4702         }
 4703 
 4704         /* PR-SCTP supported parameter */
 4705         if (stcb->asoc.prsctp_supported == 1) {
 4706                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4707                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4708                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 4709                 ph->param_length = htons(parameter_len);
 4710                 chunk_len += parameter_len;
 4711         }
 4712 
 4713         /* Add NAT friendly parameter. */
 4714         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
 4715                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4716                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4717                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 4718                 ph->param_length = htons(parameter_len);
 4719                 chunk_len += parameter_len;
 4720         }
 4721 
 4722         /* And now tell the peer which extensions we support */
 4723         num_ext = 0;
 4724         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 4725         if (stcb->asoc.prsctp_supported == 1) {
 4726                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 4727                 if (stcb->asoc.idata_supported) {
 4728                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
 4729                 }
 4730         }
 4731         if (stcb->asoc.auth_supported == 1) {
 4732                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 4733         }
 4734         if (stcb->asoc.asconf_supported == 1) {
 4735                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 4736                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 4737         }
 4738         if (stcb->asoc.reconfig_supported == 1) {
 4739                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 4740         }
 4741         if (stcb->asoc.idata_supported) {
 4742                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
 4743         }
 4744         if (stcb->asoc.nrsack_supported == 1) {
 4745                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 4746         }
 4747         if (stcb->asoc.pktdrop_supported == 1) {
 4748                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 4749         }
 4750         if (num_ext > 0) {
 4751                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 4752                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 4753                 pr_supported->ph.param_length = htons(parameter_len);
 4754                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4755                 chunk_len += parameter_len;
 4756         }
 4757         /* add authentication parameters */
 4758         if (stcb->asoc.auth_supported) {
 4759                 /* attach RANDOM parameter, if available */
 4760                 if (stcb->asoc.authinfo.random != NULL) {
 4761                         struct sctp_auth_random *randp;
 4762 
 4763                         if (padding_len > 0) {
 4764                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4765                                 chunk_len += padding_len;
 4766                                 padding_len = 0;
 4767                         }
 4768                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 4769                         parameter_len = (uint16_t)sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
 4770                         /* random key already contains the header */
 4771                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
 4772                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4773                         chunk_len += parameter_len;
 4774                 }
 4775                 /* add HMAC_ALGO parameter */
 4776                 if (stcb->asoc.local_hmacs != NULL) {
 4777                         struct sctp_auth_hmac_algo *hmacs;
 4778 
 4779                         if (padding_len > 0) {
 4780                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4781                                 chunk_len += padding_len;
 4782                                 padding_len = 0;
 4783                         }
 4784                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 4785                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_hmac_algo) +
 4786                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
 4787                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 4788                         hmacs->ph.param_length = htons(parameter_len);
 4789                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *)hmacs->hmac_ids);
 4790                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4791                         chunk_len += parameter_len;
 4792                 }
 4793                 /* add CHUNKS parameter */
 4794                 if (stcb->asoc.local_auth_chunks != NULL) {
 4795                         struct sctp_auth_chunk_list *chunks;
 4796 
 4797                         if (padding_len > 0) {
 4798                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4799                                 chunk_len += padding_len;
 4800                                 padding_len = 0;
 4801                         }
 4802                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 4803                         parameter_len = (uint16_t)(sizeof(struct sctp_auth_chunk_list) +
 4804                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
 4805                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 4806                         chunks->ph.param_length = htons(parameter_len);
 4807                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
 4808                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4809                         chunk_len += parameter_len;
 4810                 }
 4811         }
 4812 
 4813         /* now any cookie time extensions */
 4814         if (stcb->asoc.cookie_preserve_req > 0) {
 4815                 struct sctp_cookie_perserve_param *cookie_preserve;
 4816 
 4817                 if (padding_len > 0) {
 4818                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4819                         chunk_len += padding_len;
 4820                         padding_len = 0;
 4821                 }
 4822                 parameter_len = (uint16_t)sizeof(struct sctp_cookie_perserve_param);
 4823                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
 4824                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 4825                 cookie_preserve->ph.param_length = htons(parameter_len);
 4826                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 4827                 stcb->asoc.cookie_preserve_req = 0;
 4828                 chunk_len += parameter_len;
 4829         }
 4830 
 4831         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
 4832                 uint8_t i;
 4833 
 4834                 if (padding_len > 0) {
 4835                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4836                         chunk_len += padding_len;
 4837                         padding_len = 0;
 4838                 }
 4839                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 4840                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4841                         parameter_len += (uint16_t)sizeof(uint16_t);
 4842                 }
 4843                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4844                         parameter_len += (uint16_t)sizeof(uint16_t);
 4845                 }
 4846                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
 4847                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 4848                 sup_addr->ph.param_length = htons(parameter_len);
 4849                 i = 0;
 4850                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4851                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
 4852                 }
 4853                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4854                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
 4855                 }
 4856                 padding_len = 4 - 2 * i;
 4857                 chunk_len += parameter_len;
 4858         }
 4859 
 4860         SCTP_BUF_LEN(m) = chunk_len;
 4861         /* now the addresses */
 4862         /*
 4863          * To optimize this we could put the scoping stuff into a structure
 4864          * and remove the individual uint8's from the assoc structure. Then
 4865          * we could just sifa in the address within the stcb. But for now
 4866          * this is a quick hack to get the address stuff teased apart.
 4867          */
 4868         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
 4869             m, cnt_inits_to,
 4870             &padding_len, &chunk_len);
 4871 
 4872         init->ch.chunk_length = htons(chunk_len);
 4873         if (padding_len > 0) {
 4874                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 4875                         sctp_m_freem(m);
 4876                         return;
 4877                 }
 4878         }
 4879         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 4880         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 4881             (struct sockaddr *)&net->ro._l_addr,
 4882             m, 0, NULL, 0, 0, 0, 0,
 4883             inp->sctp_lport, stcb->rport, htonl(0),
 4884             net->port, NULL,
 4885             0, 0,
 4886             so_locked))) {
 4887                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 4888                 if (error == ENOBUFS) {
 4889                         stcb->asoc.ifp_had_enobuf = 1;
 4890                         SCTP_STAT_INCR(sctps_lowlevelerr);
 4891                 }
 4892         } else {
 4893                 stcb->asoc.ifp_had_enobuf = 0;
 4894         }
 4895         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 4896         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 4897 }
 4898 
 4899 struct mbuf *
 4900 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 4901     int param_offset, int *abort_processing,
 4902     struct sctp_chunkhdr *cp,
 4903     int *nat_friendly,
 4904     int *cookie_found)
 4905 {
 4906         /*
 4907          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 4908          * being equal to the beginning of the params i.e. (iphlen +
 4909          * sizeof(struct sctp_init_msg) parse through the parameters to the
 4910          * end of the mbuf verifying that all parameters are known.
 4911          *
 4912          * For unknown parameters build and return a mbuf with
 4913          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 4914          * processing this chunk stop, and set *abort_processing to 1.
 4915          *
 4916          * By having param_offset be pre-set to where parameters begin it is
 4917          * hoped that this routine may be reused in the future by new
 4918          * features.
 4919          */
 4920         struct sctp_paramhdr *phdr, params;
 4921 
 4922         struct mbuf *mat, *m_tmp, *op_err, *op_err_last;
 4923         int at, limit, pad_needed;
 4924         uint16_t ptype, plen, padded_size;
 4925 
 4926         *abort_processing = 0;
 4927         if (cookie_found != NULL) {
 4928                 *cookie_found = 0;
 4929         }
 4930         mat = in_initpkt;
 4931         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 4932         at = param_offset;
 4933         op_err = NULL;
 4934         op_err_last = NULL;
 4935         pad_needed = 0;
 4936         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 4937         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4938         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 4939                 ptype = ntohs(phdr->param_type);
 4940                 plen = ntohs(phdr->param_length);
 4941                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 4942                         /* wacked parameter */
 4943                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 4944                         goto invalid_size;
 4945                 }
 4946                 limit -= SCTP_SIZE32(plen);
 4947                 /*-
 4948                  * All parameters for all chunks that we know/understand are
 4949                  * listed here. We process them other places and make
 4950                  * appropriate stop actions per the upper bits. However this
 4951                  * is the generic routine processor's can call to get back
 4952                  * an operr.. to either incorporate (init-ack) or send.
 4953                  */
 4954                 padded_size = SCTP_SIZE32(plen);
 4955                 switch (ptype) {
 4956                         /* Param's with variable size */
 4957                 case SCTP_HEARTBEAT_INFO:
 4958                 case SCTP_UNRECOG_PARAM:
 4959                 case SCTP_ERROR_CAUSE_IND:
 4960                         /* ok skip fwd */
 4961                         at += padded_size;
 4962                         break;
 4963                 case SCTP_STATE_COOKIE:
 4964                         if (cookie_found != NULL) {
 4965                                 *cookie_found = 1;
 4966                         }
 4967                         at += padded_size;
 4968                         break;
 4969                         /* Param's with variable size within a range */
 4970                 case SCTP_CHUNK_LIST:
 4971                 case SCTP_SUPPORTED_CHUNK_EXT:
 4972                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 4973                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 4974                                 goto invalid_size;
 4975                         }
 4976                         at += padded_size;
 4977                         break;
 4978                 case SCTP_SUPPORTED_ADDRTYPE:
 4979                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 4980                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 4981                                 goto invalid_size;
 4982                         }
 4983                         at += padded_size;
 4984                         break;
 4985                 case SCTP_RANDOM:
 4986                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 4987                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 4988                                 goto invalid_size;
 4989                         }
 4990                         at += padded_size;
 4991                         break;
 4992                 case SCTP_SET_PRIM_ADDR:
 4993                 case SCTP_DEL_IP_ADDRESS:
 4994                 case SCTP_ADD_IP_ADDRESS:
 4995                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 4996                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 4997                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 4998                                 goto invalid_size;
 4999                         }
 5000                         at += padded_size;
 5001                         break;
 5002                         /* Param's with a fixed size */
 5003                 case SCTP_IPV4_ADDRESS:
 5004                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 5005                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 5006                                 goto invalid_size;
 5007                         }
 5008                         at += padded_size;
 5009                         break;
 5010                 case SCTP_IPV6_ADDRESS:
 5011                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 5012                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 5013                                 goto invalid_size;
 5014                         }
 5015                         at += padded_size;
 5016                         break;
 5017                 case SCTP_COOKIE_PRESERVE:
 5018                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 5019                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 5020                                 goto invalid_size;
 5021                         }
 5022                         at += padded_size;
 5023                         break;
 5024                 case SCTP_HAS_NAT_SUPPORT:
 5025                         *nat_friendly = 1;
 5026                         /* fall through */
 5027                 case SCTP_PRSCTP_SUPPORTED:
 5028                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5029                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
 5030                                 goto invalid_size;
 5031                         }
 5032                         at += padded_size;
 5033                         break;
 5034                 case SCTP_ECN_CAPABLE:
 5035                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5036                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 5037                                 goto invalid_size;
 5038                         }
 5039                         at += padded_size;
 5040                         break;
 5041                 case SCTP_ULP_ADAPTATION:
 5042                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 5043                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 5044                                 goto invalid_size;
 5045                         }
 5046                         at += padded_size;
 5047                         break;
 5048                 case SCTP_SUCCESS_REPORT:
 5049                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 5050                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 5051                                 goto invalid_size;
 5052                         }
 5053                         at += padded_size;
 5054                         break;
 5055                 case SCTP_HOSTNAME_ADDRESS:
 5056                         {
 5057                                 /* Hostname parameters are deprecated. */
 5058                                 struct sctp_gen_error_cause *cause;
 5059                                 int l_len;
 5060 
 5061                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 5062                                 *abort_processing = 1;
 5063                                 sctp_m_freem(op_err);
 5064                                 op_err = NULL;
 5065                                 op_err_last = NULL;
 5066 #ifdef INET6
 5067                                 l_len = SCTP_MIN_OVERHEAD;
 5068 #else
 5069                                 l_len = SCTP_MIN_V4_OVERHEAD;
 5070 #endif
 5071                                 l_len += sizeof(struct sctp_chunkhdr);
 5072                                 l_len += sizeof(struct sctp_gen_error_cause);
 5073                                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5074                                 if (op_err != NULL) {
 5075                                         /*
 5076                                          * Pre-reserve space for IP, SCTP,
 5077                                          * and chunk header.
 5078                                          */
 5079 #ifdef INET6
 5080                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5081 #else
 5082                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5083 #endif
 5084                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5085                                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5086                                         SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
 5087                                         cause = mtod(op_err, struct sctp_gen_error_cause *);
 5088                                         cause->code = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 5089                                         cause->length = htons((uint16_t)(sizeof(struct sctp_gen_error_cause) + plen));
 5090                                         SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
 5091                                         if (SCTP_BUF_NEXT(op_err) == NULL) {
 5092                                                 sctp_m_freem(op_err);
 5093                                                 op_err = NULL;
 5094                                                 op_err_last = NULL;
 5095                                         }
 5096                                 }
 5097                                 return (op_err);
 5098                         }
 5099                 default:
 5100                         /*
 5101                          * we do not recognize the parameter figure out what
 5102                          * we do.
 5103                          */
 5104                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 5105                         if ((ptype & 0x4000) == 0x4000) {
 5106                                 /* Report bit is set?? */
 5107                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 5108                                 if (op_err == NULL) {
 5109                                         int l_len;
 5110 
 5111                                         /* Ok need to try to get an mbuf */
 5112 #ifdef INET6
 5113                                         l_len = SCTP_MIN_OVERHEAD;
 5114 #else
 5115                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5116 #endif
 5117                                         l_len += sizeof(struct sctp_chunkhdr);
 5118                                         l_len += sizeof(struct sctp_paramhdr);
 5119                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5120                                         if (op_err) {
 5121                                                 SCTP_BUF_LEN(op_err) = 0;
 5122 #ifdef INET6
 5123                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5124 #else
 5125                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5126 #endif
 5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5128                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5129                                                 op_err_last = op_err;
 5130                                         }
 5131                                 }
 5132                                 if (op_err != NULL) {
 5133                                         /* If we have space */
 5134                                         struct sctp_paramhdr *param;
 5135 
 5136                                         if (pad_needed > 0) {
 5137                                                 op_err_last = sctp_add_pad_tombuf(op_err_last, pad_needed);
 5138                                         }
 5139                                         if (op_err_last == NULL) {
 5140                                                 sctp_m_freem(op_err);
 5141                                                 op_err = NULL;
 5142                                                 op_err_last = NULL;
 5143                                                 goto more_processing;
 5144                                         }
 5145                                         if (M_TRAILINGSPACE(op_err_last) < (int)sizeof(struct sctp_paramhdr)) {
 5146                                                 m_tmp = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
 5147                                                 if (m_tmp == NULL) {
 5148                                                         sctp_m_freem(op_err);
 5149                                                         op_err = NULL;
 5150                                                         op_err_last = NULL;
 5151                                                         goto more_processing;
 5152                                                 }
 5153                                                 SCTP_BUF_LEN(m_tmp) = 0;
 5154                                                 SCTP_BUF_NEXT(m_tmp) = NULL;
 5155                                                 SCTP_BUF_NEXT(op_err_last) = m_tmp;
 5156                                                 op_err_last = m_tmp;
 5157                                         }
 5158                                         param = (struct sctp_paramhdr *)(mtod(op_err_last, caddr_t)+SCTP_BUF_LEN(op_err_last));
 5159                                         param->param_type = htons(SCTP_UNRECOG_PARAM);
 5160                                         param->param_length = htons((uint16_t)sizeof(struct sctp_paramhdr) + plen);
 5161                                         SCTP_BUF_LEN(op_err_last) += sizeof(struct sctp_paramhdr);
 5162                                         SCTP_BUF_NEXT(op_err_last) = SCTP_M_COPYM(mat, at, plen, M_NOWAIT);
 5163                                         if (SCTP_BUF_NEXT(op_err_last) == NULL) {
 5164                                                 sctp_m_freem(op_err);
 5165                                                 op_err = NULL;
 5166                                                 op_err_last = NULL;
 5167                                                 goto more_processing;
 5168                                         } else {
 5169                                                 while (SCTP_BUF_NEXT(op_err_last) != NULL) {
 5170                                                         op_err_last = SCTP_BUF_NEXT(op_err_last);
 5171                                                 }
 5172                                         }
 5173                                         if (plen % 4 != 0) {
 5174                                                 pad_needed = 4 - (plen % 4);
 5175                                         } else {
 5176                                                 pad_needed = 0;
 5177                                         }
 5178                                 }
 5179                         }
 5180         more_processing:
 5181                         if ((ptype & 0x8000) == 0x0000) {
 5182                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 5183                                 return (op_err);
 5184                         } else {
 5185                                 /* skip this chunk and continue processing */
 5186                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 5187                                 at += SCTP_SIZE32(plen);
 5188                         }
 5189                         break;
 5190                 }
 5191                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 5192         }
 5193         return (op_err);
 5194 invalid_size:
 5195         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 5196         *abort_processing = 1;
 5197         sctp_m_freem(op_err);
 5198         op_err = NULL;
 5199         op_err_last = NULL;
 5200         if (phdr != NULL) {
 5201                 struct sctp_paramhdr *param;
 5202                 int l_len;
 5203 #ifdef INET6
 5204                 l_len = SCTP_MIN_OVERHEAD;
 5205 #else
 5206                 l_len = SCTP_MIN_V4_OVERHEAD;
 5207 #endif
 5208                 l_len += sizeof(struct sctp_chunkhdr);
 5209                 l_len += (2 * sizeof(struct sctp_paramhdr));
 5210                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5211                 if (op_err) {
 5212                         SCTP_BUF_LEN(op_err) = 0;
 5213 #ifdef INET6
 5214                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5215 #else
 5216                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5217 #endif
 5218                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5219                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5220                         SCTP_BUF_LEN(op_err) = 2 * sizeof(struct sctp_paramhdr);
 5221                         param = mtod(op_err, struct sctp_paramhdr *);
 5222                         param->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 5223                         param->param_length = htons(2 * sizeof(struct sctp_paramhdr));
 5224                         param++;
 5225                         param->param_type = htons(ptype);
 5226                         param->param_length = htons(plen);
 5227                 }
 5228         }
 5229         return (op_err);
 5230 }
 5231 
 5232 /*
 5233  * Given a INIT chunk, look through the parameters to verify that there
 5234  * are no new addresses.
 5235  * Return true, if there is a new address or there is a problem parsing
 5236    the parameters. Provide an optional error cause used when sending an ABORT.
 5237  * Return false, if there are no new addresses and there is no problem in
 5238    parameter processing.
 5239  */
 5240 static bool
 5241 sctp_are_there_new_addresses(struct sctp_association *asoc,
 5242     struct mbuf *in_initpkt, int offset, int limit, struct sockaddr *src,
 5243     struct mbuf **op_err)
 5244 {
 5245         struct sockaddr *sa_touse;
 5246         struct sockaddr *sa;
 5247         struct sctp_paramhdr *phdr, params;
 5248         struct sctp_nets *net;
 5249 #ifdef INET
 5250         struct sockaddr_in sin4, *sa4;
 5251 #endif
 5252 #ifdef INET6
 5253         struct sockaddr_in6 sin6, *sa6;
 5254 #endif
 5255         uint16_t ptype, plen;
 5256         bool fnd, check_src;
 5257 
 5258         *op_err = NULL;
 5259 #ifdef INET
 5260         memset(&sin4, 0, sizeof(sin4));
 5261         sin4.sin_family = AF_INET;
 5262         sin4.sin_len = sizeof(sin4);
 5263 #endif
 5264 #ifdef INET6
 5265         memset(&sin6, 0, sizeof(sin6));
 5266         sin6.sin6_family = AF_INET6;
 5267         sin6.sin6_len = sizeof(sin6);
 5268 #endif
 5269         /* First what about the src address of the pkt ? */
 5270         check_src = false;
 5271         switch (src->sa_family) {
 5272 #ifdef INET
 5273         case AF_INET:
 5274                 if (asoc->scope.ipv4_addr_legal) {
 5275                         check_src = true;
 5276                 }
 5277                 break;
 5278 #endif
 5279 #ifdef INET6
 5280         case AF_INET6:
 5281                 if (asoc->scope.ipv6_addr_legal) {
 5282                         check_src = true;
 5283                 }
 5284                 break;
 5285 #endif
 5286         default:
 5287                 /* TSNH */
 5288                 break;
 5289         }
 5290         if (check_src) {
 5291                 fnd = false;
 5292                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5293                         sa = (struct sockaddr *)&net->ro._l_addr;
 5294                         if (sa->sa_family == src->sa_family) {
 5295 #ifdef INET
 5296                                 if (sa->sa_family == AF_INET) {
 5297                                         struct sockaddr_in *src4;
 5298 
 5299                                         sa4 = (struct sockaddr_in *)sa;
 5300                                         src4 = (struct sockaddr_in *)src;
 5301                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
 5302                                                 fnd = true;
 5303                                                 break;
 5304                                         }
 5305                                 }
 5306 #endif
 5307 #ifdef INET6
 5308                                 if (sa->sa_family == AF_INET6) {
 5309                                         struct sockaddr_in6 *src6;
 5310 
 5311                                         sa6 = (struct sockaddr_in6 *)sa;
 5312                                         src6 = (struct sockaddr_in6 *)src;
 5313                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
 5314                                                 fnd = true;
 5315                                                 break;
 5316                                         }
 5317                                 }
 5318 #endif
 5319                         }
 5320                 }
 5321                 if (!fnd) {
 5322                         /*
 5323                          * If sending an ABORT in case of an additional
 5324                          * address, don't use the new address error cause.
 5325                          * This looks no different than if no listener was
 5326                          * present.
 5327                          */
 5328                         *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
 5329                         return (true);
 5330                 }
 5331         }
 5332         /* Ok so far lets munge through the rest of the packet */
 5333         offset += sizeof(struct sctp_init_chunk);
 5334         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5335         while (phdr) {
 5336                 sa_touse = NULL;
 5337                 ptype = ntohs(phdr->param_type);
 5338                 plen = ntohs(phdr->param_length);
 5339                 if (offset + plen > limit) {
 5340                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Partial parameter");
 5341                         return (true);
 5342                 }
 5343                 if (plen < sizeof(struct sctp_paramhdr)) {
 5344                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length too small");
 5345                         return (true);
 5346                 }
 5347                 switch (ptype) {
 5348 #ifdef INET
 5349                 case SCTP_IPV4_ADDRESS:
 5350                         {
 5351                                 struct sctp_ipv4addr_param *p4, p4_buf;
 5352 
 5353                                 if (plen != sizeof(struct sctp_ipv4addr_param)) {
 5354                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
 5355                                         return (true);
 5356                                 }
 5357                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5358                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 5359                                 if (phdr == NULL) {
 5360                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
 5361                                         return (true);
 5362                                 }
 5363                                 if (asoc->scope.ipv4_addr_legal) {
 5364                                         p4 = (struct sctp_ipv4addr_param *)phdr;
 5365                                         sin4.sin_addr.s_addr = p4->addr;
 5366                                         sa_touse = (struct sockaddr *)&sin4;
 5367                                 }
 5368                                 break;
 5369                         }
 5370 #endif
 5371 #ifdef INET6
 5372                 case SCTP_IPV6_ADDRESS:
 5373                         {
 5374                                 struct sctp_ipv6addr_param *p6, p6_buf;
 5375 
 5376                                 if (plen != sizeof(struct sctp_ipv6addr_param)) {
 5377                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "Parameter length illegal");
 5378                                         return (true);
 5379                                 }
 5380                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5381                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 5382                                 if (phdr == NULL) {
 5383                                         *op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
 5384                                         return (true);
 5385                                 }
 5386                                 if (asoc->scope.ipv6_addr_legal) {
 5387                                         p6 = (struct sctp_ipv6addr_param *)phdr;
 5388                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 5389                                             sizeof(p6->addr));
 5390                                         sa_touse = (struct sockaddr *)&sin6;
 5391                                 }
 5392                                 break;
 5393                         }
 5394 #endif
 5395                 default:
 5396                         sa_touse = NULL;
 5397                         break;
 5398                 }
 5399                 if (sa_touse) {
 5400                         /* ok, sa_touse points to one to check */
 5401                         fnd = false;
 5402                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5403                                 sa = (struct sockaddr *)&net->ro._l_addr;
 5404                                 if (sa->sa_family != sa_touse->sa_family) {
 5405                                         continue;
 5406                                 }
 5407 #ifdef INET
 5408                                 if (sa->sa_family == AF_INET) {
 5409                                         sa4 = (struct sockaddr_in *)sa;
 5410                                         if (sa4->sin_addr.s_addr ==
 5411                                             sin4.sin_addr.s_addr) {
 5412                                                 fnd = true;
 5413                                                 break;
 5414                                         }
 5415                                 }
 5416 #endif
 5417 #ifdef INET6
 5418                                 if (sa->sa_family == AF_INET6) {
 5419                                         sa6 = (struct sockaddr_in6 *)sa;
 5420                                         if (SCTP6_ARE_ADDR_EQUAL(
 5421                                             sa6, &sin6)) {
 5422                                                 fnd = true;
 5423                                                 break;
 5424                                         }
 5425                                 }
 5426 #endif
 5427                         }
 5428                         if (!fnd) {
 5429                                 /*
 5430                                  * If sending an ABORT in case of an
 5431                                  * additional address, don't use the new
 5432                                  * address error cause. This looks no
 5433                                  * different than if no listener was
 5434                                  * present.
 5435                                  */
 5436                                 *op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), "Address added");
 5437                                 return (true);
 5438                         }
 5439                 }
 5440                 offset += SCTP_SIZE32(plen);
 5441                 if (offset >= limit) {
 5442                         break;
 5443                 }
 5444                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5445         }
 5446         return (false);
 5447 }
 5448 
 5449 /*
 5450  * Given a MBUF chain that was sent into us containing an INIT. Build a
 5451  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 5452  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 5453  * message (i.e. the struct sctp_init_msg).
 5454  */
 5455 void
 5456 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 5457     struct sctp_nets *src_net, struct mbuf *init_pkt,
 5458     int iphlen, int offset,
 5459     struct sockaddr *src, struct sockaddr *dst,
 5460     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
 5461     uint8_t mflowtype, uint32_t mflowid,
 5462     uint32_t vrf_id, uint16_t port)
 5463 {
 5464         struct sctp_association *asoc;
 5465         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
 5466         struct sctp_init_ack_chunk *initack;
 5467         struct sctp_adaptation_layer_indication *ali;
 5468         struct sctp_supported_chunk_types_param *pr_supported;
 5469         struct sctp_paramhdr *ph;
 5470         union sctp_sockstore *over_addr;
 5471         struct sctp_scoping scp;
 5472         struct timeval now;
 5473 #ifdef INET
 5474         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
 5475         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
 5476         struct sockaddr_in *sin;
 5477 #endif
 5478 #ifdef INET6
 5479         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
 5480         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
 5481         struct sockaddr_in6 *sin6;
 5482 #endif
 5483         struct sockaddr *to;
 5484         struct sctp_state_cookie stc;
 5485         struct sctp_nets *net = NULL;
 5486         uint8_t *signature = NULL;
 5487         int cnt_inits_to = 0;
 5488         uint16_t his_limit, i_want;
 5489         int abort_flag;
 5490         int nat_friendly = 0;
 5491         int error;
 5492         struct socket *so;
 5493         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 5494 
 5495         if (stcb) {
 5496                 asoc = &stcb->asoc;
 5497         } else {
 5498                 asoc = NULL;
 5499         }
 5500         if ((asoc != NULL) &&
 5501             (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
 5502                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, offset + ntohs(init_chk->ch.chunk_length), src, &op_err)) {
 5503                         /*
 5504                          * new addresses, out of here in non-cookie-wait
 5505                          * states
 5506                          */
 5507                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5508                             mflowtype, mflowid, inp->fibnum,
 5509                             vrf_id, port);
 5510                         return;
 5511                 }
 5512                 if (src_net != NULL && (src_net->port != port)) {
 5513                         /*
 5514                          * change of remote encapsulation port, out of here
 5515                          * in non-cookie-wait states
 5516                          *
 5517                          * Send an ABORT, without an specific error cause.
 5518                          * This looks no different than if no listener was
 5519                          * present.
 5520                          */
 5521                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5522                             "Remote encapsulation port changed");
 5523                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5524                             mflowtype, mflowid, inp->fibnum,
 5525                             vrf_id, port);
 5526                         return;
 5527                 }
 5528         }
 5529         abort_flag = 0;
 5530         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 5531             (offset + sizeof(struct sctp_init_chunk)),
 5532             &abort_flag,
 5533             (struct sctp_chunkhdr *)init_chk,
 5534             &nat_friendly, NULL);
 5535         if (abort_flag) {
 5536 do_a_abort:
 5537                 if (op_err == NULL) {
 5538                         char msg[SCTP_DIAG_INFO_LEN];
 5539 
 5540                         SCTP_SNPRINTF(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
 5541                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5542                             msg);
 5543                 }
 5544                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
 5545                     init_chk->init.initiate_tag, op_err,
 5546                     mflowtype, mflowid, inp->fibnum,
 5547                     vrf_id, port);
 5548                 return;
 5549         }
 5550         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 5551         if (m == NULL) {
 5552                 /* No memory, INIT timer will re-attempt. */
 5553                 sctp_m_freem(op_err);
 5554                 return;
 5555         }
 5556         chunk_len = (uint16_t)sizeof(struct sctp_init_ack_chunk);
 5557         padding_len = 0;
 5558 
 5559         /*
 5560          * We might not overwrite the identification[] completely and on
 5561          * some platforms time_entered will contain some padding. Therefore
 5562          * zero out the cookie to avoid putting uninitialized memory on the
 5563          * wire.
 5564          */
 5565         memset(&stc, 0, sizeof(struct sctp_state_cookie));
 5566 
 5567         /* the time I built cookie */
 5568         (void)SCTP_GETTIME_TIMEVAL(&now);
 5569         stc.time_entered.tv_sec = now.tv_sec;
 5570         stc.time_entered.tv_usec = now.tv_usec;
 5571 
 5572         /* populate any tie tags */
 5573         if (asoc != NULL) {
 5574                 /* unlock before tag selections */
 5575                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
 5576                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
 5577                 stc.cookie_life = asoc->cookie_life;
 5578                 net = asoc->primary_destination;
 5579         } else {
 5580                 stc.tie_tag_my_vtag = 0;
 5581                 stc.tie_tag_peer_vtag = 0;
 5582                 /* life I will award this cookie */
 5583                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
 5584         }
 5585 
 5586         /* copy in the ports for later check */
 5587         stc.myport = sh->dest_port;
 5588         stc.peerport = sh->src_port;
 5589 
 5590         /*
 5591          * If we wanted to honor cookie life extensions, we would add to
 5592          * stc.cookie_life. For now we should NOT honor any extension
 5593          */
 5594         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
 5595         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 5596                 stc.ipv6_addr_legal = 1;
 5597                 if (SCTP_IPV6_V6ONLY(inp)) {
 5598                         stc.ipv4_addr_legal = 0;
 5599                 } else {
 5600                         stc.ipv4_addr_legal = 1;
 5601                 }
 5602         } else {
 5603                 stc.ipv6_addr_legal = 0;
 5604                 stc.ipv4_addr_legal = 1;
 5605         }
 5606         stc.ipv4_scope = 0;
 5607         if (net == NULL) {
 5608                 to = src;
 5609                 switch (dst->sa_family) {
 5610 #ifdef INET
 5611                 case AF_INET:
 5612                         {
 5613                                 /* lookup address */
 5614                                 stc.address[0] = src4->sin_addr.s_addr;
 5615                                 stc.address[1] = 0;
 5616                                 stc.address[2] = 0;
 5617                                 stc.address[3] = 0;
 5618                                 stc.addr_type = SCTP_IPV4_ADDRESS;
 5619                                 /* local from address */
 5620                                 stc.laddress[0] = dst4->sin_addr.s_addr;
 5621                                 stc.laddress[1] = 0;
 5622                                 stc.laddress[2] = 0;
 5623                                 stc.laddress[3] = 0;
 5624                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
 5625                                 /* scope_id is only for v6 */
 5626                                 stc.scope_id = 0;
 5627                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
 5628                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
 5629                                         stc.ipv4_scope = 1;
 5630                                 }
 5631                                 /* Must use the address in this case */
 5632                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5633                                         stc.loopback_scope = 1;
 5634                                         stc.ipv4_scope = 1;
 5635                                         stc.site_scope = 1;
 5636                                         stc.local_scope = 0;
 5637                                 }
 5638                                 break;
 5639                         }
 5640 #endif
 5641 #ifdef INET6
 5642                 case AF_INET6:
 5643                         {
 5644                                 stc.addr_type = SCTP_IPV6_ADDRESS;
 5645                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
 5646                                 stc.scope_id = ntohs(in6_getscope(&src6->sin6_addr));
 5647                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5648                                         stc.loopback_scope = 1;
 5649                                         stc.local_scope = 0;
 5650                                         stc.site_scope = 1;
 5651                                         stc.ipv4_scope = 1;
 5652                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
 5653                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
 5654                                         /*
 5655                                          * If the new destination or source
 5656                                          * is a LINK_LOCAL we must have
 5657                                          * common both site and local scope.
 5658                                          * Don't set local scope though
 5659                                          * since we must depend on the
 5660                                          * source to be added implicitly. We
 5661                                          * cannot assure just because we
 5662                                          * share one link that all links are
 5663                                          * common.
 5664                                          */
 5665                                         stc.local_scope = 0;
 5666                                         stc.site_scope = 1;
 5667                                         stc.ipv4_scope = 1;
 5668                                         /*
 5669                                          * we start counting for the private
 5670                                          * address stuff at 1. since the
 5671                                          * link local we source from won't
 5672                                          * show up in our scoped count.
 5673                                          */
 5674                                         cnt_inits_to = 1;
 5675                                         /*
 5676                                          * pull out the scope_id from
 5677                                          * incoming pkt
 5678                                          */
 5679                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
 5680                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
 5681                                         /*
 5682                                          * If the new destination or source
 5683                                          * is SITE_LOCAL then we must have
 5684                                          * site scope in common.
 5685                                          */
 5686                                         stc.site_scope = 1;
 5687                                 }
 5688                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
 5689                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
 5690                                 break;
 5691                         }
 5692 #endif
 5693                 default:
 5694                         /* TSNH */
 5695                         goto do_a_abort;
 5696                         break;
 5697                 }
 5698         } else {
 5699                 /* set the scope per the existing tcb */
 5700 
 5701 #ifdef INET6
 5702                 struct sctp_nets *lnet;
 5703 #endif
 5704 
 5705                 stc.loopback_scope = asoc->scope.loopback_scope;
 5706                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
 5707                 stc.site_scope = asoc->scope.site_scope;
 5708                 stc.local_scope = asoc->scope.local_scope;
 5709 #ifdef INET6
 5710                 /* Why do we not consider IPv4 LL addresses? */
 5711                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 5712                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
 5713                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
 5714                                         /*
 5715                                          * if we have a LL address, start
 5716                                          * counting at 1.
 5717                                          */
 5718                                         cnt_inits_to = 1;
 5719                                 }
 5720                         }
 5721                 }
 5722 #endif
 5723                 /* use the net pointer */
 5724                 to = (struct sockaddr *)&net->ro._l_addr;
 5725                 switch (to->sa_family) {
 5726 #ifdef INET
 5727                 case AF_INET:
 5728                         sin = (struct sockaddr_in *)to;
 5729                         stc.address[0] = sin->sin_addr.s_addr;
 5730                         stc.address[1] = 0;
 5731                         stc.address[2] = 0;
 5732                         stc.address[3] = 0;
 5733                         stc.addr_type = SCTP_IPV4_ADDRESS;
 5734                         if (net->src_addr_selected == 0) {
 5735                                 /*
 5736                                  * strange case here, the INIT should have
 5737                                  * did the selection.
 5738                                  */
 5739                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5740                                     stcb, (sctp_route_t *)&net->ro,
 5741                                     net, 0, vrf_id);
 5742                                 if (net->ro._s_addr == NULL) {
 5743                                         sctp_m_freem(op_err);
 5744                                         sctp_m_freem(m);
 5745                                         return;
 5746                                 }
 5747 
 5748                                 net->src_addr_selected = 1;
 5749                         }
 5750                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
 5751                         stc.laddress[1] = 0;
 5752                         stc.laddress[2] = 0;
 5753                         stc.laddress[3] = 0;
 5754                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 5755                         /* scope_id is only for v6 */
 5756                         stc.scope_id = 0;
 5757                         break;
 5758 #endif
 5759 #ifdef INET6
 5760                 case AF_INET6:
 5761                         sin6 = (struct sockaddr_in6 *)to;
 5762                         memcpy(&stc.address, &sin6->sin6_addr,
 5763                             sizeof(struct in6_addr));
 5764                         stc.addr_type = SCTP_IPV6_ADDRESS;
 5765                         stc.scope_id = sin6->sin6_scope_id;
 5766                         if (net->src_addr_selected == 0) {
 5767                                 /*
 5768                                  * strange case here, the INIT should have
 5769                                  * done the selection.
 5770                                  */
 5771                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5772                                     stcb, (sctp_route_t *)&net->ro,
 5773                                     net, 0, vrf_id);
 5774                                 if (net->ro._s_addr == NULL) {
 5775                                         sctp_m_freem(op_err);
 5776                                         sctp_m_freem(m);
 5777                                         return;
 5778                                 }
 5779 
 5780                                 net->src_addr_selected = 1;
 5781                         }
 5782                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
 5783                             sizeof(struct in6_addr));
 5784                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 5785                         break;
 5786 #endif
 5787                 }
 5788         }
 5789         /* Now lets put the SCTP header in place */
 5790         initack = mtod(m, struct sctp_init_ack_chunk *);
 5791         /* Save it off for quick ref */
 5792         stc.peers_vtag = ntohl(init_chk->init.initiate_tag);
 5793         /* who are we */
 5794         memcpy(stc.identification, SCTP_VERSION_STRING,
 5795             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
 5796         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
 5797         /* now the chunk header */
 5798         initack->ch.chunk_type = SCTP_INITIATION_ACK;
 5799         initack->ch.chunk_flags = 0;
 5800         /* fill in later from mbuf we build */
 5801         initack->ch.chunk_length = 0;
 5802         /* place in my tag */
 5803         if ((asoc != NULL) &&
 5804             ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
 5805             (SCTP_GET_STATE(stcb) == SCTP_STATE_INUSE) ||
 5806             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED))) {
 5807                 /* re-use the v-tags and init-seq here */
 5808                 initack->init.initiate_tag = htonl(asoc->my_vtag);
 5809                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
 5810         } else {
 5811                 uint32_t vtag, itsn;
 5812 
 5813                 if (asoc) {
 5814                         atomic_add_int(&asoc->refcnt, 1);
 5815                         SCTP_TCB_UNLOCK(stcb);
 5816         new_tag:
 5817                         SCTP_INP_INFO_RLOCK();
 5818                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5819                         SCTP_INP_INFO_RUNLOCK();
 5820                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
 5821                                 /*
 5822                                  * Got a duplicate vtag on some guy behind a
 5823                                  * nat make sure we don't use it.
 5824                                  */
 5825                                 goto new_tag;
 5826                         }
 5827                         initack->init.initiate_tag = htonl(vtag);
 5828                         /* get a TSN to use too */
 5829                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 5830                         initack->init.initial_tsn = htonl(itsn);
 5831                         SCTP_TCB_LOCK(stcb);
 5832                         atomic_subtract_int(&asoc->refcnt, 1);
 5833                 } else {
 5834                         SCTP_INP_INCR_REF(inp);
 5835                         SCTP_INP_RUNLOCK(inp);
 5836                         SCTP_INP_INFO_RLOCK();
 5837                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5838                         SCTP_INP_INFO_RUNLOCK();
 5839                         initack->init.initiate_tag = htonl(vtag);
 5840                         /* get a TSN to use too */
 5841                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 5842                         SCTP_INP_RLOCK(inp);
 5843                         SCTP_INP_DECR_REF(inp);
 5844                 }
 5845         }
 5846         /* save away my tag to */
 5847         stc.my_vtag = initack->init.initiate_tag;
 5848 
 5849         /* set up some of the credits. */
 5850         so = inp->sctp_socket;
 5851         if (so == NULL) {
 5852                 /* memory problem */
 5853                 sctp_m_freem(op_err);
 5854                 sctp_m_freem(m);
 5855                 return;
 5856         } else {
 5857                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 5858         }
 5859         /* set what I want */
 5860         his_limit = ntohs(init_chk->init.num_inbound_streams);
 5861         /* choose what I want */
 5862         if (asoc != NULL) {
 5863                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
 5864                         i_want = asoc->streamoutcnt;
 5865                 } else {
 5866                         i_want = asoc->pre_open_streams;
 5867                 }
 5868         } else {
 5869                 i_want = inp->sctp_ep.pre_open_stream_count;
 5870         }
 5871         if (his_limit < i_want) {
 5872                 /* I Want more :< */
 5873                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
 5874         } else {
 5875                 /* I can have what I want :> */
 5876                 initack->init.num_outbound_streams = htons(i_want);
 5877         }
 5878         /* tell him his limit. */
 5879         initack->init.num_inbound_streams =
 5880             htons(inp->sctp_ep.max_open_streams_intome);
 5881 
 5882         /* adaptation layer indication parameter */
 5883         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 5884                 parameter_len = (uint16_t)sizeof(struct sctp_adaptation_layer_indication);
 5885                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 5886                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 5887                 ali->ph.param_length = htons(parameter_len);
 5888                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 5889                 chunk_len += parameter_len;
 5890         }
 5891 
 5892         /* ECN parameter */
 5893         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
 5894             ((asoc == NULL) && (inp->ecn_supported == 1))) {
 5895                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5896                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5897                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 5898                 ph->param_length = htons(parameter_len);
 5899                 chunk_len += parameter_len;
 5900         }
 5901 
 5902         /* PR-SCTP supported parameter */
 5903         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5904             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5905                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5906                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5907                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 5908                 ph->param_length = htons(parameter_len);
 5909                 chunk_len += parameter_len;
 5910         }
 5911 
 5912         /* Add NAT friendly parameter */
 5913         if (nat_friendly) {
 5914                 parameter_len = (uint16_t)sizeof(struct sctp_paramhdr);
 5915                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5916                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 5917                 ph->param_length = htons(parameter_len);
 5918                 chunk_len += parameter_len;
 5919         }
 5920 
 5921         /* And now tell the peer which extensions we support */
 5922         num_ext = 0;
 5923         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 5924         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5925             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5926                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 5927                 if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
 5928                     ((asoc == NULL) && (inp->idata_supported == 1))) {
 5929                         pr_supported->chunk_types[num_ext++] = SCTP_IFORWARD_CUM_TSN;
 5930                 }
 5931         }
 5932         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5933             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5934                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 5935         }
 5936         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
 5937             ((asoc == NULL) && (inp->asconf_supported == 1))) {
 5938                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 5939                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 5940         }
 5941         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
 5942             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
 5943                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 5944         }
 5945         if (((asoc != NULL) && (asoc->idata_supported == 1)) ||
 5946             ((asoc == NULL) && (inp->idata_supported == 1))) {
 5947                 pr_supported->chunk_types[num_ext++] = SCTP_IDATA;
 5948         }
 5949         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
 5950             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
 5951                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 5952         }
 5953         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
 5954             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
 5955                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 5956         }
 5957         if (num_ext > 0) {
 5958                 parameter_len = (uint16_t)sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 5959                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 5960                 pr_supported->ph.param_length = htons(parameter_len);
 5961                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 5962                 chunk_len += parameter_len;
 5963         }
 5964 
 5965         /* add authentication parameters */
 5966         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5967             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5968                 struct sctp_auth_random *randp;
 5969                 struct sctp_auth_hmac_algo *hmacs;
 5970                 struct sctp_auth_chunk_list *chunks;
 5971 
 5972                 if (padding_len > 0) {
 5973                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 5974                         chunk_len += padding_len;
 5975                         padding_len = 0;
 5976                 }
 5977                 /* generate and add RANDOM parameter */
 5978                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 5979                 parameter_len = (uint16_t)sizeof(struct sctp_auth_random) +
 5980                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 5981                 randp->ph.param_type = htons(SCTP_RANDOM);
 5982                 randp->ph.param_length = htons(parameter_len);
 5983                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
 5984                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 5985                 chunk_len += parameter_len;
 5986 
 5987                 if (padding_len > 0) {
 5988                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 5989                         chunk_len += padding_len;
 5990                         padding_len = 0;
 5991                 }
 5992                 /* add HMAC_ALGO parameter */
 5993                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 5994                 parameter_len = (uint16_t)sizeof(struct sctp_auth_hmac_algo) +
 5995                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 5996                     (uint8_t *)hmacs->hmac_ids);
 5997                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 5998                 hmacs->ph.param_length = htons(parameter_len);
 5999                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6000                 chunk_len += parameter_len;
 6001 
 6002                 if (padding_len > 0) {
 6003                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6004                         chunk_len += padding_len;
 6005                         padding_len = 0;
 6006                 }
 6007                 /* add CHUNKS parameter */
 6008                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 6009                 parameter_len = (uint16_t)sizeof(struct sctp_auth_chunk_list) +
 6010                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 6011                     chunks->chunk_types);
 6012                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 6013                 chunks->ph.param_length = htons(parameter_len);
 6014                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6015                 chunk_len += parameter_len;
 6016         }
 6017         SCTP_BUF_LEN(m) = chunk_len;
 6018         m_last = m;
 6019         /* now the addresses */
 6020         /*
 6021          * To optimize this we could put the scoping stuff into a structure
 6022          * and remove the individual uint8's from the stc structure. Then we
 6023          * could just sifa in the address within the stc.. but for now this
 6024          * is a quick hack to get the address stuff teased apart.
 6025          */
 6026         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 6027         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 6028         scp.loopback_scope = stc.loopback_scope;
 6029         scp.ipv4_local_scope = stc.ipv4_scope;
 6030         scp.local_scope = stc.local_scope;
 6031         scp.site_scope = stc.site_scope;
 6032         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
 6033             cnt_inits_to,
 6034             &padding_len, &chunk_len);
 6035         /* padding_len can only be positive, if no addresses have been added */
 6036         if (padding_len > 0) {
 6037                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6038                 chunk_len += padding_len;
 6039                 SCTP_BUF_LEN(m) += padding_len;
 6040                 padding_len = 0;
 6041         }
 6042 
 6043         /* tack on the operational error if present */
 6044         if (op_err) {
 6045                 parameter_len = 0;
 6046                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6047                         parameter_len += SCTP_BUF_LEN(m_tmp);
 6048                 }
 6049                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6050                 SCTP_BUF_NEXT(m_last) = op_err;
 6051                 while (SCTP_BUF_NEXT(m_last) != NULL) {
 6052                         m_last = SCTP_BUF_NEXT(m_last);
 6053                 }
 6054                 chunk_len += parameter_len;
 6055         }
 6056         if (padding_len > 0) {
 6057                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
 6058                 if (m_last == NULL) {
 6059                         /* Houston we have a problem, no space */
 6060                         sctp_m_freem(m);
 6061                         return;
 6062                 }
 6063                 chunk_len += padding_len;
 6064                 padding_len = 0;
 6065         }
 6066         /* Now we must build a cookie */
 6067         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
 6068         if (m_cookie == NULL) {
 6069                 /* memory problem */
 6070                 sctp_m_freem(m);
 6071                 return;
 6072         }
 6073         /* Now append the cookie to the end and update the space/size */
 6074         SCTP_BUF_NEXT(m_last) = m_cookie;
 6075         parameter_len = 0;
 6076         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6077                 parameter_len += SCTP_BUF_LEN(m_tmp);
 6078                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 6079                         m_last = m_tmp;
 6080                 }
 6081         }
 6082         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6083         chunk_len += parameter_len;
 6084 
 6085         /*
 6086          * Place in the size, but we don't include the last pad (if any) in
 6087          * the INIT-ACK.
 6088          */
 6089         initack->ch.chunk_length = htons(chunk_len);
 6090 
 6091         /*
 6092          * Time to sign the cookie, we don't sign over the cookie signature
 6093          * though thus we set trailer.
 6094          */
 6095         (void)sctp_hmac_m(SCTP_HMAC,
 6096             (uint8_t *)inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 6097             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 6098             (uint8_t *)signature, SCTP_SIGNATURE_SIZE);
 6099         /*
 6100          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 6101          * here since the timer will drive a retranmission.
 6102          */
 6103         if (padding_len > 0) {
 6104                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 6105                         sctp_m_freem(m);
 6106                         return;
 6107                 }
 6108         }
 6109         if (stc.loopback_scope) {
 6110                 over_addr = (union sctp_sockstore *)dst;
 6111         } else {
 6112                 over_addr = NULL;
 6113         }
 6114 
 6115         if ((error = sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 6116             0, 0,
 6117             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
 6118             port, over_addr,
 6119             mflowtype, mflowid,
 6120             SCTP_SO_NOT_LOCKED))) {
 6121                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak send error %d\n", error);
 6122                 if (error == ENOBUFS) {
 6123                         if (asoc != NULL) {
 6124                                 asoc->ifp_had_enobuf = 1;
 6125                         }
 6126                         SCTP_STAT_INCR(sctps_lowlevelerr);
 6127                 }
 6128         } else {
 6129                 if (asoc != NULL) {
 6130                         asoc->ifp_had_enobuf = 0;
 6131                 }
 6132         }
 6133         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 6134 }
 6135 
 6136 static void
 6137 sctp_prune_prsctp(struct sctp_tcb *stcb,
 6138     struct sctp_association *asoc,
 6139     struct sctp_nonpad_sndrcvinfo *srcv,
 6140     int dataout)
 6141 {
 6142         int freed_spc = 0;
 6143         struct sctp_tmit_chunk *chk, *nchk;
 6144 
 6145         SCTP_TCB_LOCK_ASSERT(stcb);
 6146         if ((asoc->prsctp_supported) &&
 6147             (asoc->sent_queue_cnt_removeable > 0)) {
 6148                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 6149                         /*
 6150                          * Look for chunks marked with the PR_SCTP flag AND
 6151                          * the buffer space flag. If the one being sent is
 6152                          * equal or greater priority then purge the old one
 6153                          * and free some space.
 6154                          */
 6155                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6156                                 /*
 6157                                  * This one is PR-SCTP AND buffer space
 6158                                  * limited type
 6159                                  */
 6160                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
 6161                                         /*
 6162                                          * Lower numbers equates to higher
 6163                                          * priority. So if the one we are
 6164                                          * looking at has a larger priority,
 6165                                          * we want to drop the data and NOT
 6166                                          * retransmit it.
 6167                                          */
 6168                                         if (chk->data) {
 6169                                                 /*
 6170                                                  * We release the book_size
 6171                                                  * if the mbuf is here
 6172                                                  */
 6173                                                 int ret_spc;
 6174                                                 uint8_t sent;
 6175 
 6176                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 6177                                                         sent = 1;
 6178                                                 else
 6179                                                         sent = 0;
 6180                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6181                                                     sent,
 6182                                                     SCTP_SO_LOCKED);
 6183                                                 freed_spc += ret_spc;
 6184                                                 if (freed_spc >= dataout) {
 6185                                                         return;
 6186                                                 }
 6187                                         }       /* if chunk was present */
 6188                                 }       /* if of sufficient priority */
 6189                         }       /* if chunk has enabled */
 6190                 }               /* tailqforeach */
 6191 
 6192                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 6193                         /* Here we must move to the sent queue and mark */
 6194                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6195                                 if (chk->rec.data.timetodrop.tv_sec > (long)srcv->sinfo_timetolive) {
 6196                                         if (chk->data) {
 6197                                                 /*
 6198                                                  * We release the book_size
 6199                                                  * if the mbuf is here
 6200                                                  */
 6201                                                 int ret_spc;
 6202 
 6203                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6204                                                     0, SCTP_SO_LOCKED);
 6205 
 6206                                                 freed_spc += ret_spc;
 6207                                                 if (freed_spc >= dataout) {
 6208                                                         return;
 6209                                                 }
 6210                                         }       /* end if chk->data */
 6211                                 }       /* end if right class */
 6212                         }       /* end if chk pr-sctp */
 6213                 }               /* tailqforeachsafe (chk) */
 6214         }                       /* if enabled in asoc */
 6215 }
 6216 
 6217 uint32_t
 6218 sctp_get_frag_point(struct sctp_tcb *stcb)
 6219 {
 6220         struct sctp_association *asoc;
 6221         uint32_t frag_point, overhead;
 6222 
 6223         asoc = &stcb->asoc;
 6224         /* Consider IP header and SCTP common header. */
 6225         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 6226                 overhead = SCTP_MIN_OVERHEAD;
 6227         } else {
 6228                 overhead = SCTP_MIN_V4_OVERHEAD;
 6229         }
 6230         /* Consider DATA/IDATA chunk header and AUTH header, if needed. */
 6231         if (asoc->idata_supported) {
 6232                 overhead += sizeof(struct sctp_idata_chunk);
 6233                 if (sctp_auth_is_required_chunk(SCTP_IDATA, asoc->peer_auth_chunks)) {
 6234                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
 6235                 }
 6236         } else {
 6237                 overhead += sizeof(struct sctp_data_chunk);
 6238                 if (sctp_auth_is_required_chunk(SCTP_DATA, asoc->peer_auth_chunks)) {
 6239                         overhead += sctp_get_auth_chunk_len(asoc->peer_hmac_id);
 6240                 }
 6241         }
 6242         KASSERT(overhead % 4 == 0,
 6243             ("overhead (%u) not a multiple of 4", overhead));
 6244         /* Consider padding. */
 6245         if (asoc->smallest_mtu % 4 > 0) {
 6246                 overhead += (asoc->smallest_mtu % 4);
 6247         }
 6248         KASSERT(asoc->smallest_mtu > overhead,
 6249             ("Association MTU (%u) too small for overhead (%u)",
 6250             asoc->smallest_mtu, overhead));
 6251         frag_point = asoc->smallest_mtu - overhead;
 6252         KASSERT(frag_point % 4 == 0,
 6253             ("frag_point (%u) not a multiple of 4", frag_point));
 6254         /* Honor MAXSEG socket option. */
 6255         if ((asoc->sctp_frag_point > 0) &&
 6256             (asoc->sctp_frag_point < frag_point)) {
 6257                 frag_point = asoc->sctp_frag_point;
 6258         }
 6259         return (frag_point);
 6260 }
 6261 
 6262 static void
 6263 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
 6264 {
 6265         /*
 6266          * We assume that the user wants PR_SCTP_TTL if the user provides a
 6267          * positive lifetime but does not specify any PR_SCTP policy.
 6268          */
 6269         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 6270                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6271         } else if (sp->timetolive > 0) {
 6272                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
 6273                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6274         } else {
 6275                 return;
 6276         }
 6277         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 6278         case CHUNK_FLAGS_PR_SCTP_BUF:
 6279                 /*
 6280                  * Time to live is a priority stored in tv_sec when doing
 6281                  * the buffer drop thing.
 6282                  */
 6283                 sp->ts.tv_sec = sp->timetolive;
 6284                 sp->ts.tv_usec = 0;
 6285                 break;
 6286         case CHUNK_FLAGS_PR_SCTP_TTL:
 6287                 {
 6288                         struct timeval tv;
 6289 
 6290                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6291                         tv.tv_sec = sp->timetolive / 1000;
 6292                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 6293                         /*
 6294                          * TODO sctp_constants.h needs alternative time
 6295                          * macros when _KERNEL is undefined.
 6296                          */
 6297                         timevaladd(&sp->ts, &tv);
 6298                 }
 6299                 break;
 6300         case CHUNK_FLAGS_PR_SCTP_RTX:
 6301                 /*
 6302                  * Time to live is a the number or retransmissions stored in
 6303                  * tv_sec.
 6304                  */
 6305                 sp->ts.tv_sec = sp->timetolive;
 6306                 sp->ts.tv_usec = 0;
 6307                 break;
 6308         default:
 6309                 SCTPDBG(SCTP_DEBUG_USRREQ1,
 6310                     "Unknown PR_SCTP policy %u.\n",
 6311                     PR_SCTP_POLICY(sp->sinfo_flags));
 6312                 break;
 6313         }
 6314 }
 6315 
 6316 static int
 6317 sctp_msg_append(struct sctp_tcb *stcb,
 6318     struct sctp_nets *net,
 6319     struct mbuf *m,
 6320     struct sctp_nonpad_sndrcvinfo *srcv)
 6321 {
 6322         int error = 0;
 6323         struct mbuf *at;
 6324         struct sctp_stream_queue_pending *sp = NULL;
 6325         struct sctp_stream_out *strm;
 6326 
 6327         SCTP_TCB_LOCK_ASSERT(stcb);
 6328 
 6329         /*
 6330          * Given an mbuf chain, put it into the association send queue and
 6331          * place it on the wheel
 6332          */
 6333         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 6334                 /* Invalid stream number */
 6335                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6336                 error = EINVAL;
 6337                 goto out_now;
 6338         }
 6339         if ((stcb->asoc.stream_locked) &&
 6340             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 6341                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6342                 error = EINVAL;
 6343                 goto out_now;
 6344         }
 6345         if ((stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
 6346             (stcb->asoc.strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
 6347                 /*
 6348                  * Can't queue any data while stream reset is underway.
 6349                  */
 6350                 if (stcb->asoc.strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
 6351                         error = EAGAIN;
 6352                 } else {
 6353                         error = EINVAL;
 6354                 }
 6355                 goto out_now;
 6356         }
 6357         /* Now can we send this? */
 6358         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
 6359             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 6360             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 6361             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 6362                 /* got data while shutting down */
 6363                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EPIPE);
 6364                 error = EPIPE;
 6365                 goto out_now;
 6366         }
 6367         sctp_alloc_a_strmoq(stcb, sp);
 6368         if (sp == NULL) {
 6369                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6370                 error = ENOMEM;
 6371                 goto out_now;
 6372         }
 6373         sp->sinfo_flags = srcv->sinfo_flags;
 6374         sp->timetolive = srcv->sinfo_timetolive;
 6375         sp->ppid = srcv->sinfo_ppid;
 6376         sp->context = srcv->sinfo_context;
 6377         sp->fsn = 0;
 6378         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 6379                 sp->net = net;
 6380                 atomic_add_int(&sp->net->ref_count, 1);
 6381         } else {
 6382                 sp->net = NULL;
 6383         }
 6384         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6385         sp->sid = srcv->sinfo_stream;
 6386         sp->msg_is_complete = 1;
 6387         sp->sender_all_done = 1;
 6388         sp->some_taken = 0;
 6389         sp->data = m;
 6390         sp->tail_mbuf = NULL;
 6391         sctp_set_prsctp_policy(sp);
 6392         /*
 6393          * We could in theory (for sendall) sifa the length in, but we would
 6394          * still have to hunt through the chain since we need to setup the
 6395          * tail_mbuf
 6396          */
 6397         sp->length = 0;
 6398         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
 6399                 if (SCTP_BUF_NEXT(at) == NULL)
 6400                         sp->tail_mbuf = at;
 6401                 sp->length += SCTP_BUF_LEN(at);
 6402         }
 6403         if (srcv->sinfo_keynumber_valid) {
 6404                 sp->auth_keyid = srcv->sinfo_keynumber;
 6405         } else {
 6406                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
 6407         }
 6408         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
 6409                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
 6410                 sp->holds_key_ref = 1;
 6411         }
 6412         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 6413         sctp_snd_sb_alloc(stcb, sp->length);
 6414         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 6415         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 6416         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp);
 6417         m = NULL;
 6418 out_now:
 6419         if (m) {
 6420                 sctp_m_freem(m);
 6421         }
 6422         return (error);
 6423 }
 6424 
 6425 static struct mbuf *
 6426 sctp_copy_mbufchain(struct mbuf *clonechain,
 6427     struct mbuf *outchain,
 6428     struct mbuf **endofchain,
 6429     int can_take_mbuf,
 6430     int sizeofcpy,
 6431     uint8_t copy_by_ref)
 6432 {
 6433         struct mbuf *m;
 6434         struct mbuf *appendchain;
 6435         caddr_t cp;
 6436         int len;
 6437 
 6438         if (endofchain == NULL) {
 6439                 /* error */
 6440 error_out:
 6441                 if (outchain)
 6442                         sctp_m_freem(outchain);
 6443                 return (NULL);
 6444         }
 6445         if (can_take_mbuf) {
 6446                 appendchain = clonechain;
 6447         } else {
 6448                 if (!copy_by_ref &&
 6449                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))) {
 6450                         /* Its not in a cluster */
 6451                         if (*endofchain == NULL) {
 6452                                 /* lets get a mbuf cluster */
 6453                                 if (outchain == NULL) {
 6454                                         /* This is the general case */
 6455                         new_mbuf:
 6456                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6457                                         if (outchain == NULL) {
 6458                                                 goto error_out;
 6459                                         }
 6460                                         SCTP_BUF_LEN(outchain) = 0;
 6461                                         *endofchain = outchain;
 6462                                         /* get the prepend space */
 6463                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 6464                                 } else {
 6465                                         /*
 6466                                          * We really should not get a NULL
 6467                                          * in endofchain
 6468                                          */
 6469                                         /* find end */
 6470                                         m = outchain;
 6471                                         while (m) {
 6472                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6473                                                         *endofchain = m;
 6474                                                         break;
 6475                                                 }
 6476                                                 m = SCTP_BUF_NEXT(m);
 6477                                         }
 6478                                         /* sanity */
 6479                                         if (*endofchain == NULL) {
 6480                                                 /*
 6481                                                  * huh, TSNH XXX maybe we
 6482                                                  * should panic
 6483                                                  */
 6484                                                 sctp_m_freem(outchain);
 6485                                                 goto new_mbuf;
 6486                                         }
 6487                                 }
 6488                                 /* get the new end of length */
 6489                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6490                         } else {
 6491                                 /* how much is left at the end? */
 6492                                 len = (int)M_TRAILINGSPACE(*endofchain);
 6493                         }
 6494                         /* Find the end of the data, for appending */
 6495                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 6496 
 6497                         /* Now lets copy it out */
 6498                         if (len >= sizeofcpy) {
 6499                                 /* It all fits, copy it in */
 6500                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 6501                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6502                         } else {
 6503                                 /* fill up the end of the chain */
 6504                                 if (len > 0) {
 6505                                         m_copydata(clonechain, 0, len, cp);
 6506                                         SCTP_BUF_LEN((*endofchain)) += len;
 6507                                         /* now we need another one */
 6508                                         sizeofcpy -= len;
 6509                                 }
 6510                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6511                                 if (m == NULL) {
 6512                                         /* We failed */
 6513                                         goto error_out;
 6514                                 }
 6515                                 SCTP_BUF_NEXT((*endofchain)) = m;
 6516                                 *endofchain = m;
 6517                                 cp = mtod((*endofchain), caddr_t);
 6518                                 m_copydata(clonechain, len, sizeofcpy, cp);
 6519                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6520                         }
 6521                         return (outchain);
 6522                 } else {
 6523                         /* copy the old fashion way */
 6524                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
 6525 #ifdef SCTP_MBUF_LOGGING
 6526                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6527                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
 6528                         }
 6529 #endif
 6530                 }
 6531         }
 6532         if (appendchain == NULL) {
 6533                 /* error */
 6534                 if (outchain)
 6535                         sctp_m_freem(outchain);
 6536                 return (NULL);
 6537         }
 6538         if (outchain) {
 6539                 /* tack on to the end */
 6540                 if (*endofchain != NULL) {
 6541                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 6542                 } else {
 6543                         m = outchain;
 6544                         while (m) {
 6545                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6546                                         SCTP_BUF_NEXT(m) = appendchain;
 6547                                         break;
 6548                                 }
 6549                                 m = SCTP_BUF_NEXT(m);
 6550                         }
 6551                 }
 6552                 /*
 6553                  * save off the end and update the end-chain position
 6554                  */
 6555                 m = appendchain;
 6556                 while (m) {
 6557                         if (SCTP_BUF_NEXT(m) == NULL) {
 6558                                 *endofchain = m;
 6559                                 break;
 6560                         }
 6561                         m = SCTP_BUF_NEXT(m);
 6562                 }
 6563                 return (outchain);
 6564         } else {
 6565                 /* save off the end and update the end-chain position */
 6566                 m = appendchain;
 6567                 while (m) {
 6568                         if (SCTP_BUF_NEXT(m) == NULL) {
 6569                                 *endofchain = m;
 6570                                 break;
 6571                         }
 6572                         m = SCTP_BUF_NEXT(m);
 6573                 }
 6574                 return (appendchain);
 6575         }
 6576 }
 6577 
 6578 static int
 6579 sctp_med_chunk_output(struct sctp_inpcb *inp,
 6580     struct sctp_tcb *stcb,
 6581     struct sctp_association *asoc,
 6582     int *num_out,
 6583     int *reason_code,
 6584     int control_only, int from_where,
 6585     struct timeval *now, int *now_filled,
 6586     uint32_t frag_point, int so_locked);
 6587 
 6588 static void
 6589 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 6590     uint32_t val SCTP_UNUSED)
 6591 {
 6592         struct sctp_copy_all *ca;
 6593         struct mbuf *m;
 6594         int ret = 0;
 6595         int added_control = 0;
 6596         int un_sent, do_chunk_output = 1;
 6597         struct sctp_association *asoc;
 6598         struct sctp_nets *net;
 6599 
 6600         ca = (struct sctp_copy_all *)ptr;
 6601         if (ca->m == NULL) {
 6602                 return;
 6603         }
 6604         if (ca->inp != inp) {
 6605                 /* TSNH */
 6606                 return;
 6607         }
 6608         if (ca->sndlen > 0) {
 6609                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
 6610                 if (m == NULL) {
 6611                         /* can't copy so we are done */
 6612                         ca->cnt_failed++;
 6613                         return;
 6614                 }
 6615 #ifdef SCTP_MBUF_LOGGING
 6616                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6617                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
 6618                 }
 6619 #endif
 6620         } else {
 6621                 m = NULL;
 6622         }
 6623         SCTP_TCB_LOCK_ASSERT(stcb);
 6624         if (stcb->asoc.alternate) {
 6625                 net = stcb->asoc.alternate;
 6626         } else {
 6627                 net = stcb->asoc.primary_destination;
 6628         }
 6629         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 6630                 /* Abort this assoc with m as the user defined reason */
 6631                 if (m != NULL) {
 6632                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
 6633                 } else {
 6634                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 6635                             0, M_NOWAIT, 1, MT_DATA);
 6636                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
 6637                 }
 6638                 if (m != NULL) {
 6639                         struct sctp_paramhdr *ph;
 6640 
 6641                         ph = mtod(m, struct sctp_paramhdr *);
 6642                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 6643                         ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + ca->sndlen));
 6644                 }
 6645                 /*
 6646                  * We add one here to keep the assoc from dis-appearing on
 6647                  * us.
 6648                  */
 6649                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6650                 sctp_abort_an_association(inp, stcb, m, false, SCTP_SO_NOT_LOCKED);
 6651                 /*
 6652                  * sctp_abort_an_association calls sctp_free_asoc() free
 6653                  * association will NOT free it since we incremented the
 6654                  * refcnt .. we do this to prevent it being freed and things
 6655                  * getting tricky since we could end up (from free_asoc)
 6656                  * calling inpcb_free which would get a recursive lock call
 6657                  * to the iterator lock.. But as a consequence of that the
 6658                  * stcb will return to us un-locked.. since free_asoc
 6659                  * returns with either no TCB or the TCB unlocked, we must
 6660                  * relock.. to unlock in the iterator timer :-0
 6661                  */
 6662                 SCTP_TCB_LOCK(stcb);
 6663                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 6664                 goto no_chunk_output;
 6665         } else {
 6666                 if (m != NULL) {
 6667                         ret = sctp_msg_append(stcb, net, m, &ca->sndrcv);
 6668                 }
 6669                 asoc = &stcb->asoc;
 6670                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 6671                         /* shutdown this assoc */
 6672                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6673                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6674                             sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED) == 0) {
 6675                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6676                                         goto abort_anyway;
 6677                                 }
 6678                                 /*
 6679                                  * there is nothing queued to send, so I'm
 6680                                  * done...
 6681                                  */
 6682                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 6683                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6684                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6685                                         /*
 6686                                          * only send SHUTDOWN the first time
 6687                                          * through
 6688                                          */
 6689                                         if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
 6690                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 6691                                         }
 6692                                         SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
 6693                                         sctp_stop_timers_for_shutdown(stcb);
 6694                                         sctp_send_shutdown(stcb, net);
 6695                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 6696                                             net);
 6697                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6698                                             NULL);
 6699                                         added_control = 1;
 6700                                         do_chunk_output = 0;
 6701                                 }
 6702                         } else {
 6703                                 /*
 6704                                  * we still got (or just got) data to send,
 6705                                  * so set SHUTDOWN_PENDING
 6706                                  */
 6707                                 /*
 6708                                  * XXX sockets draft says that SCTP_EOF
 6709                                  * should be sent with no data.  currently,
 6710                                  * we will allow user data to be sent first
 6711                                  * and move to SHUTDOWN-PENDING
 6712                                  */
 6713                                 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
 6714                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6715                                     (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6716                                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
 6717                                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
 6718                                         }
 6719                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
 6720                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6721                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6722                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 6723                                                 struct mbuf *op_err;
 6724                                                 char msg[SCTP_DIAG_INFO_LEN];
 6725 
 6726                                 abort_anyway:
 6727                                                 SCTP_SNPRINTF(msg, sizeof(msg),
 6728                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
 6729                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 6730                                                     msg);
 6731                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6732                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 6733                                                     op_err, false, SCTP_SO_NOT_LOCKED);
 6734                                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 6735                                                 goto no_chunk_output;
 6736                                         }
 6737                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6738                                             NULL);
 6739                                 }
 6740                         }
 6741                 }
 6742         }
 6743         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 6744             (stcb->asoc.stream_queue_cnt * SCTP_DATA_CHUNK_OVERHEAD(stcb)));
 6745 
 6746         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 6747             (stcb->asoc.total_flight > 0) &&
 6748             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
 6749                 do_chunk_output = 0;
 6750         }
 6751         if (do_chunk_output)
 6752                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 6753         else if (added_control) {
 6754                 struct timeval now;
 6755                 int num_out, reason, now_filled = 0;
 6756 
 6757                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 6758                     &reason, 1, 1, &now, &now_filled,
 6759                     sctp_get_frag_point(stcb),
 6760                     SCTP_SO_NOT_LOCKED);
 6761         }
 6762 no_chunk_output:
 6763         if (ret) {
 6764                 ca->cnt_failed++;
 6765         } else {
 6766                 ca->cnt_sent++;
 6767         }
 6768 }
 6769 
 6770 static void
 6771 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
 6772 {
 6773         struct sctp_copy_all *ca;
 6774 
 6775         ca = (struct sctp_copy_all *)ptr;
 6776         /*
 6777          * Do a notify here? Kacheong suggests that the notify be done at
 6778          * the send time.. so you would push up a notification if any send
 6779          * failed. Don't know if this is feasible since the only failures we
 6780          * have is "memory" related and if you cannot get an mbuf to send
 6781          * the data you surely can't get an mbuf to send up to notify the
 6782          * user you can't send the data :->
 6783          */
 6784 
 6785         /* now free everything */
 6786         if (ca->inp) {
 6787                 /* Lets clear the flag to allow others to run. */
 6788                 SCTP_INP_WLOCK(ca->inp);
 6789                 ca->inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
 6790                 SCTP_INP_WUNLOCK(ca->inp);
 6791         }
 6792         sctp_m_freem(ca->m);
 6793         SCTP_FREE(ca, SCTP_M_COPYAL);
 6794 }
 6795 
 6796 static struct mbuf *
 6797 sctp_copy_out_all(struct uio *uio, ssize_t len)
 6798 {
 6799         struct mbuf *ret, *at;
 6800         ssize_t left, willcpy, cancpy, error;
 6801 
 6802         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
 6803         if (ret == NULL) {
 6804                 /* TSNH */
 6805                 return (NULL);
 6806         }
 6807         left = len;
 6808         SCTP_BUF_LEN(ret) = 0;
 6809         /* save space for the data chunk header */
 6810         cancpy = (int)M_TRAILINGSPACE(ret);
 6811         willcpy = min(cancpy, left);
 6812         at = ret;
 6813         while (left > 0) {
 6814                 /* Align data to the end */
 6815                 error = uiomove(mtod(at, caddr_t), (int)willcpy, uio);
 6816                 if (error) {
 6817         err_out_now:
 6818                         sctp_m_freem(at);
 6819                         return (NULL);
 6820                 }
 6821                 SCTP_BUF_LEN(at) = (int)willcpy;
 6822                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 6823                 left -= willcpy;
 6824                 if (left > 0) {
 6825                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg((unsigned int)left, 0, M_WAITOK, 1, MT_DATA);
 6826                         if (SCTP_BUF_NEXT(at) == NULL) {
 6827                                 goto err_out_now;
 6828                         }
 6829                         at = SCTP_BUF_NEXT(at);
 6830                         SCTP_BUF_LEN(at) = 0;
 6831                         cancpy = (int)M_TRAILINGSPACE(at);
 6832                         willcpy = min(cancpy, left);
 6833                 }
 6834         }
 6835         return (ret);
 6836 }
 6837 
 6838 static int
 6839 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 6840     struct sctp_nonpad_sndrcvinfo *srcv)
 6841 {
 6842         int ret;
 6843         struct sctp_copy_all *ca;
 6844 
 6845         if (uio->uio_resid > (ssize_t)SCTP_BASE_SYSCTL(sctp_sendall_limit)) {
 6846                 /* You must not be larger than the limit! */
 6847                 return (EMSGSIZE);
 6848         }
 6849         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 6850             SCTP_M_COPYAL);
 6851         if (ca == NULL) {
 6852                 sctp_m_freem(m);
 6853                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6854                 return (ENOMEM);
 6855         }
 6856         memset(ca, 0, sizeof(struct sctp_copy_all));
 6857 
 6858         ca->inp = inp;
 6859         if (srcv != NULL) {
 6860                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 6861         }
 6862 
 6863         /* Serialize. */
 6864         SCTP_INP_WLOCK(inp);
 6865         if ((inp->sctp_flags & SCTP_PCB_FLAGS_SND_ITERATOR_UP) != 0) {
 6866                 SCTP_INP_WUNLOCK(inp);
 6867                 sctp_m_freem(m);
 6868                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6869                 return (EBUSY);
 6870         }
 6871         inp->sctp_flags |= SCTP_PCB_FLAGS_SND_ITERATOR_UP;
 6872         SCTP_INP_WUNLOCK(inp);
 6873 
 6874         /*
 6875          * take off the sendall flag, it would be bad if we failed to do
 6876          * this :-0
 6877          */
 6878         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 6879         /* get length and mbuf chain */
 6880         if (uio) {
 6881                 ca->sndlen = uio->uio_resid;
 6882                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 6883                 if (ca->m == NULL) {
 6884                         SCTP_FREE(ca, SCTP_M_COPYAL);
 6885                         sctp_m_freem(m);
 6886                         SCTP_INP_WLOCK(inp);
 6887                         inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
 6888                         SCTP_INP_WUNLOCK(inp);
 6889                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6890                         return (ENOMEM);
 6891                 }
 6892         } else {
 6893                 /* Gather the length of the send */
 6894                 struct mbuf *mat;
 6895 
 6896                 ca->sndlen = 0;
 6897                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 6898                         ca->sndlen += SCTP_BUF_LEN(mat);
 6899                 }
 6900         }
 6901         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 6902             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 6903             SCTP_ASOC_ANY_STATE,
 6904             (void *)ca, 0,
 6905             sctp_sendall_completes, inp, 1);
 6906         if (ret) {
 6907                 SCTP_INP_WLOCK(inp);
 6908                 inp->sctp_flags &= ~SCTP_PCB_FLAGS_SND_ITERATOR_UP;
 6909                 SCTP_INP_WUNLOCK(inp);
 6910                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6911                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 6912                 return (EFAULT);
 6913         }
 6914         return (0);
 6915 }
 6916 
 6917 void
 6918 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6919 {
 6920         struct sctp_tmit_chunk *chk, *nchk;
 6921 
 6922         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 6923                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 6924                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6925                         asoc->ctrl_queue_cnt--;
 6926                         if (chk->data) {
 6927                                 sctp_m_freem(chk->data);
 6928                                 chk->data = NULL;
 6929                         }
 6930                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6931                 }
 6932         }
 6933 }
 6934 
 6935 void
 6936 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 6937 {
 6938         struct sctp_association *asoc;
 6939         struct sctp_tmit_chunk *chk, *nchk;
 6940         struct sctp_asconf_chunk *acp;
 6941 
 6942         asoc = &stcb->asoc;
 6943         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 6944                 /* find SCTP_ASCONF chunk in queue */
 6945                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 6946                         if (chk->data) {
 6947                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
 6948                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
 6949                                         /* Not Acked yet */
 6950                                         break;
 6951                                 }
 6952                         }
 6953                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
 6954                         asoc->ctrl_queue_cnt--;
 6955                         if (chk->data) {
 6956                                 sctp_m_freem(chk->data);
 6957                                 chk->data = NULL;
 6958                         }
 6959                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6960                 }
 6961         }
 6962 }
 6963 
 6964 static void
 6965 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 6966     struct sctp_association *asoc,
 6967     struct sctp_tmit_chunk **data_list,
 6968     int bundle_at,
 6969     struct sctp_nets *net)
 6970 {
 6971         int i;
 6972         struct sctp_tmit_chunk *tp1;
 6973 
 6974         for (i = 0; i < bundle_at; i++) {
 6975                 /* off of the send queue */
 6976                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
 6977                 asoc->send_queue_cnt--;
 6978                 if (i > 0) {
 6979                         /*
 6980                          * Any chunk NOT 0 you zap the time chunk 0 gets
 6981                          * zapped or set based on if a RTO measurement is
 6982                          * needed.
 6983                          */
 6984                         data_list[i]->do_rtt = 0;
 6985                 }
 6986                 /* record time */
 6987                 data_list[i]->sent_rcv_time = net->last_sent_time;
 6988                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
 6989                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.tsn;
 6990                 if (data_list[i]->whoTo == NULL) {
 6991                         data_list[i]->whoTo = net;
 6992                         atomic_add_int(&net->ref_count, 1);
 6993                 }
 6994                 /* on to the sent queue */
 6995                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 6996                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 6997                         struct sctp_tmit_chunk *tpp;
 6998 
 6999                         /* need to move back */
 7000         back_up_more:
 7001                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 7002                         if (tpp == NULL) {
 7003                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 7004                                 goto all_done;
 7005                         }
 7006                         tp1 = tpp;
 7007                         if (SCTP_TSN_GT(tp1->rec.data.tsn, data_list[i]->rec.data.tsn)) {
 7008                                 goto back_up_more;
 7009                         }
 7010                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 7011                 } else {
 7012                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 7013                             data_list[i],
 7014                             sctp_next);
 7015                 }
 7016 all_done:
 7017                 /* This does not lower until the cum-ack passes it */
 7018                 asoc->sent_queue_cnt++;
 7019                 if ((asoc->peers_rwnd <= 0) &&
 7020                     (asoc->total_flight == 0) &&
 7021                     (bundle_at == 1)) {
 7022                         /* Mark the chunk as being a window probe */
 7023                         SCTP_STAT_INCR(sctps_windowprobed);
 7024                 }
 7025 #ifdef SCTP_AUDITING_ENABLED
 7026                 sctp_audit_log(0xC2, 3);
 7027 #endif
 7028                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 7029                 data_list[i]->snd_count = 1;
 7030                 data_list[i]->rec.data.chunk_was_revoked = 0;
 7031                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 7032                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 7033                             data_list[i]->whoTo->flight_size,
 7034                             data_list[i]->book_size,
 7035                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 7036                             data_list[i]->rec.data.tsn);
 7037                 }
 7038                 sctp_flight_size_increase(data_list[i]);
 7039                 sctp_total_flight_increase(stcb, data_list[i]);
 7040                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 7041                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 7042                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 7043                 }
 7044                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 7045                     (uint32_t)(data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 7046                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 7047                         /* SWS sender side engages */
 7048                         asoc->peers_rwnd = 0;
 7049                 }
 7050         }
 7051         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
 7052                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
 7053         }
 7054 }
 7055 
 7056 static void
 7057 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked)
 7058 {
 7059         struct sctp_tmit_chunk *chk, *nchk;
 7060 
 7061         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 7062                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7063                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 7064                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 7065                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 7066                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
 7067                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 7068                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 7069                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 7070                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 7071                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 7072                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 7073                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 7074                         /* Stray chunks must be cleaned up */
 7075         clean_up_anyway:
 7076                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 7077                         asoc->ctrl_queue_cnt--;
 7078                         if (chk->data) {
 7079                                 sctp_m_freem(chk->data);
 7080                                 chk->data = NULL;
 7081                         }
 7082                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 7083                                 asoc->fwd_tsn_cnt--;
 7084                         }
 7085                         sctp_free_a_chunk(stcb, chk, so_locked);
 7086                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 7087                         /* special handling, we must look into the param */
 7088                         if (chk != asoc->str_reset) {
 7089                                 goto clean_up_anyway;
 7090                         }
 7091                 }
 7092         }
 7093 }
 7094 
 7095 static uint32_t
 7096 sctp_can_we_split_this(struct sctp_tcb *stcb, uint32_t length,
 7097     uint32_t space_left, uint32_t frag_point, int eeor_on)
 7098 {
 7099         /*
 7100          * Make a decision on if I should split a msg into multiple parts.
 7101          * This is only asked of incomplete messages.
 7102          */
 7103         if (eeor_on) {
 7104                 /*
 7105                  * If we are doing EEOR we need to always send it if its the
 7106                  * entire thing, since it might be all the guy is putting in
 7107                  * the hopper.
 7108                  */
 7109                 if (space_left >= length) {
 7110                         /*-
 7111                          * If we have data outstanding,
 7112                          * we get another chance when the sack
 7113                          * arrives to transmit - wait for more data
 7114                          */
 7115                         if (stcb->asoc.total_flight == 0) {
 7116                                 /*
 7117                                  * If nothing is in flight, we zero the
 7118                                  * packet counter.
 7119                                  */
 7120                                 return (length);
 7121                         }
 7122                         return (0);
 7123 
 7124                 } else {
 7125                         /* You can fill the rest */
 7126                         return (space_left);
 7127                 }
 7128         }
 7129         /*-
 7130          * For those strange folk that make the send buffer
 7131          * smaller than our fragmentation point, we can't
 7132          * get a full msg in so we have to allow splitting.
 7133          */
 7134         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 7135                 return (length);
 7136         }
 7137         if ((length <= space_left) ||
 7138             ((length - space_left) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
 7139                 /* Sub-optimal residual don't split in non-eeor mode. */
 7140                 return (0);
 7141         }
 7142         /*
 7143          * If we reach here length is larger than the space_left. Do we wish
 7144          * to split it for the sake of packet putting together?
 7145          */
 7146         if (space_left >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
 7147                 /* Its ok to split it */
 7148                 return (min(space_left, frag_point));
 7149         }
 7150         /* Nope, can't split */
 7151         return (0);
 7152 }
 7153 
 7154 static uint32_t
 7155 sctp_move_to_outqueue(struct sctp_tcb *stcb,
 7156     struct sctp_nets *net,
 7157     struct sctp_stream_out *strq,
 7158     uint32_t space_left,
 7159     uint32_t frag_point,
 7160     int *giveup,
 7161     int eeor_mode,
 7162     int *bail,
 7163     int so_locked)
 7164 {
 7165         /* Move from the stream to the send_queue keeping track of the total */
 7166         struct sctp_association *asoc;
 7167         struct sctp_stream_queue_pending *sp;
 7168         struct sctp_tmit_chunk *chk;
 7169         struct sctp_data_chunk *dchkh = NULL;
 7170         struct sctp_idata_chunk *ndchkh = NULL;
 7171         uint32_t to_move, length;
 7172         int leading;
 7173         uint8_t rcv_flags = 0;
 7174         uint8_t some_taken;
 7175 
 7176         SCTP_TCB_LOCK_ASSERT(stcb);
 7177         asoc = &stcb->asoc;
 7178 one_more_time:
 7179         /* sa_ignore FREED_MEMORY */
 7180         sp = TAILQ_FIRST(&strq->outqueue);
 7181         if (sp == NULL) {
 7182                 sp = TAILQ_FIRST(&strq->outqueue);
 7183                 if (sp) {
 7184                         goto one_more_time;
 7185                 }
 7186                 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_EXPLICIT_EOR) == 0) &&
 7187                     (stcb->asoc.idata_supported == 0) &&
 7188                     (strq->last_msg_incomplete)) {
 7189                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 7190                             strq->sid,
 7191                             strq->last_msg_incomplete);
 7192                         strq->last_msg_incomplete = 0;
 7193                 }
 7194                 to_move = 0;
 7195                 goto out_of;
 7196         }
 7197         if ((sp->msg_is_complete) && (sp->length == 0)) {
 7198                 if (sp->sender_all_done) {
 7199                         /*
 7200                          * We are doing deferred cleanup. Last time through
 7201                          * when we took all the data the sender_all_done was
 7202                          * not set.
 7203                          */
 7204                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
 7205                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 7206                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 7207                                     sp->sender_all_done,
 7208                                     sp->length,
 7209                                     sp->msg_is_complete,
 7210                                     sp->put_last_out);
 7211                         }
 7212                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7213                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 7214                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
 7215                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7216                             (strq->chunks_on_queues == 0) &&
 7217                             TAILQ_EMPTY(&strq->outqueue)) {
 7218                                 stcb->asoc.trigger_reset = 1;
 7219                         }
 7220                         if (sp->net) {
 7221                                 sctp_free_remote_addr(sp->net);
 7222                                 sp->net = NULL;
 7223                         }
 7224                         if (sp->data) {
 7225                                 sctp_m_freem(sp->data);
 7226                                 sp->data = NULL;
 7227                         }
 7228                         sctp_free_a_strmoq(stcb, sp, so_locked);
 7229                         /* back to get the next msg */
 7230                         goto one_more_time;
 7231                 } else {
 7232                         /*
 7233                          * sender just finished this but still holds a
 7234                          * reference
 7235                          */
 7236                         *giveup = 1;
 7237                         to_move = 0;
 7238                         goto out_of;
 7239                 }
 7240         } else {
 7241                 /* is there some to get */
 7242                 if (sp->length == 0) {
 7243                         /* no */
 7244                         *giveup = 1;
 7245                         to_move = 0;
 7246                         goto out_of;
 7247                 } else if (sp->discard_rest) {
 7248                         /* Whack down the size */
 7249                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
 7250                         if ((stcb->sctp_socket != NULL) &&
 7251                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 7252                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
 7253                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
 7254                         }
 7255                         if (sp->data) {
 7256                                 sctp_m_freem(sp->data);
 7257                                 sp->data = NULL;
 7258                                 sp->tail_mbuf = NULL;
 7259                         }
 7260                         sp->length = 0;
 7261                         sp->some_taken = 1;
 7262                         *giveup = 1;
 7263                         to_move = 0;
 7264                         goto out_of;
 7265                 }
 7266         }
 7267         some_taken = sp->some_taken;
 7268         length = sp->length;
 7269         if (sp->msg_is_complete) {
 7270                 /* The message is complete */
 7271                 to_move = min(length, frag_point);
 7272                 if (to_move == length) {
 7273                         /* All of it fits in the MTU */
 7274                         if (sp->some_taken) {
 7275                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 7276                         } else {
 7277                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 7278                         }
 7279                         sp->put_last_out = 1;
 7280                         if (sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) {
 7281                                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7282                         }
 7283                 } else {
 7284                         /* Not all of it fits, we fragment */
 7285                         if (sp->some_taken == 0) {
 7286                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7287                         }
 7288                         sp->some_taken = 1;
 7289                 }
 7290         } else {
 7291                 to_move = sctp_can_we_split_this(stcb, length, space_left, frag_point, eeor_mode);
 7292                 if (to_move > 0) {
 7293                         if (to_move >= length) {
 7294                                 to_move = length;
 7295                         }
 7296                         if (sp->some_taken == 0) {
 7297                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7298                                 sp->some_taken = 1;
 7299                         }
 7300                 } else {
 7301                         /* Nothing to take. */
 7302                         *giveup = 1;
 7303                         to_move = 0;
 7304                         goto out_of;
 7305                 }
 7306         }
 7307 
 7308         /* If we reach here, we can copy out a chunk */
 7309         sctp_alloc_a_chunk(stcb, chk);
 7310         if (chk == NULL) {
 7311                 /* No chunk memory */
 7312                 *giveup = 1;
 7313                 to_move = 0;
 7314                 goto out_of;
 7315         }
 7316         /*
 7317          * Setup for unordered if needed by looking at the user sent info
 7318          * flags.
 7319          */
 7320         if (sp->sinfo_flags & SCTP_UNORDERED) {
 7321                 rcv_flags |= SCTP_DATA_UNORDERED;
 7322         }
 7323         if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 7324             (sp->sinfo_flags & SCTP_EOF) == SCTP_EOF) {
 7325                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7326         }
 7327         /* clear out the chunk before setting up */
 7328         memset(chk, 0, sizeof(*chk));
 7329         chk->rec.data.rcv_flags = rcv_flags;
 7330 
 7331         if (to_move >= length) {
 7332                 /* we think we can steal the whole thing */
 7333                 if (to_move < sp->length) {
 7334                         /* bail, it changed */
 7335                         goto dont_do_it;
 7336                 }
 7337                 chk->data = sp->data;
 7338                 chk->last_mbuf = sp->tail_mbuf;
 7339                 /* register the stealing */
 7340                 sp->data = sp->tail_mbuf = NULL;
 7341         } else {
 7342                 struct mbuf *m;
 7343 
 7344 dont_do_it:
 7345                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
 7346                 chk->last_mbuf = NULL;
 7347                 if (chk->data == NULL) {
 7348                         sp->some_taken = some_taken;
 7349                         sctp_free_a_chunk(stcb, chk, so_locked);
 7350                         *bail = 1;
 7351                         to_move = 0;
 7352                         goto out_of;
 7353                 }
 7354 #ifdef SCTP_MBUF_LOGGING
 7355                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7356                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
 7357                 }
 7358 #endif
 7359                 /* Pull off the data */
 7360                 m_adj(sp->data, to_move);
 7361                 /* Now lets work our way down and compact it */
 7362                 m = sp->data;
 7363                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 7364                         sp->data = SCTP_BUF_NEXT(m);
 7365                         SCTP_BUF_NEXT(m) = NULL;
 7366                         if (sp->tail_mbuf == m) {
 7367                                 /*-
 7368                                  * Freeing tail? TSNH since
 7369                                  * we supposedly were taking less
 7370                                  * than the sp->length.
 7371                                  */
 7372 #ifdef INVARIANTS
 7373                                 panic("Huh, freeing tail? - TSNH");
 7374 #else
 7375                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 7376                                 sp->tail_mbuf = sp->data = NULL;
 7377                                 sp->length = 0;
 7378 #endif
 7379                         }
 7380                         sctp_m_free(m);
 7381                         m = sp->data;
 7382                 }
 7383         }
 7384         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 7385                 chk->copy_by_ref = 1;
 7386         } else {
 7387                 chk->copy_by_ref = 0;
 7388         }
 7389         /*
 7390          * get last_mbuf and counts of mb usage This is ugly but hopefully
 7391          * its only one mbuf.
 7392          */
 7393         if (chk->last_mbuf == NULL) {
 7394                 chk->last_mbuf = chk->data;
 7395                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 7396                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 7397                 }
 7398         }
 7399 
 7400         if (to_move > length) {
 7401                 /*- This should not happen either
 7402                  * since we always lower to_move to the size
 7403                  * of sp->length if its larger.
 7404                  */
 7405 #ifdef INVARIANTS
 7406                 panic("Huh, how can to_move be larger?");
 7407 #else
 7408                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 7409                 sp->length = 0;
 7410 #endif
 7411         } else {
 7412                 atomic_subtract_int(&sp->length, to_move);
 7413         }
 7414         leading = SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7415         if (M_LEADINGSPACE(chk->data) < leading) {
 7416                 /* Not enough room for a chunk header, get some */
 7417                 struct mbuf *m;
 7418 
 7419                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 1, MT_DATA);
 7420                 if (m == NULL) {
 7421                         /*
 7422                          * we're in trouble here. _PREPEND below will free
 7423                          * all the data if there is no leading space, so we
 7424                          * must put the data back and restore.
 7425                          */
 7426                         if (sp->data == NULL) {
 7427                                 /* unsteal the data */
 7428                                 sp->data = chk->data;
 7429                                 sp->tail_mbuf = chk->last_mbuf;
 7430                         } else {
 7431                                 struct mbuf *m_tmp;
 7432 
 7433                                 /* reassemble the data */
 7434                                 m_tmp = sp->data;
 7435                                 sp->data = chk->data;
 7436                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 7437                         }
 7438                         sp->some_taken = some_taken;
 7439                         atomic_add_int(&sp->length, to_move);
 7440                         chk->data = NULL;
 7441                         *bail = 1;
 7442                         sctp_free_a_chunk(stcb, chk, so_locked);
 7443                         to_move = 0;
 7444                         goto out_of;
 7445                 } else {
 7446                         SCTP_BUF_LEN(m) = 0;
 7447                         SCTP_BUF_NEXT(m) = chk->data;
 7448                         chk->data = m;
 7449                         M_ALIGN(chk->data, 4);
 7450                 }
 7451         }
 7452         SCTP_BUF_PREPEND(chk->data, SCTP_DATA_CHUNK_OVERHEAD(stcb), M_NOWAIT);
 7453         if (chk->data == NULL) {
 7454                 /* HELP, TSNH since we assured it would not above? */
 7455 #ifdef INVARIANTS
 7456                 panic("prepend fails HELP?");
 7457 #else
 7458                 SCTP_PRINTF("prepend fails HELP?\n");
 7459                 sctp_free_a_chunk(stcb, chk, so_locked);
 7460 #endif
 7461                 *bail = 1;
 7462                 to_move = 0;
 7463                 goto out_of;
 7464         }
 7465         sctp_snd_sb_alloc(stcb, SCTP_DATA_CHUNK_OVERHEAD(stcb));
 7466         chk->book_size = chk->send_size = (uint16_t)(to_move + SCTP_DATA_CHUNK_OVERHEAD(stcb));
 7467         chk->book_size_scale = 0;
 7468         chk->sent = SCTP_DATAGRAM_UNSENT;
 7469 
 7470         chk->flags = 0;
 7471         chk->asoc = &stcb->asoc;
 7472         chk->pad_inplace = 0;
 7473         chk->no_fr_allowed = 0;
 7474         if (stcb->asoc.idata_supported == 0) {
 7475                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7476                         /* Just use 0. The receiver ignores the values. */
 7477                         chk->rec.data.mid = 0;
 7478                 } else {
 7479                         chk->rec.data.mid = strq->next_mid_ordered;
 7480                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7481                                 strq->next_mid_ordered++;
 7482                         }
 7483                 }
 7484         } else {
 7485                 if (rcv_flags & SCTP_DATA_UNORDERED) {
 7486                         chk->rec.data.mid = strq->next_mid_unordered;
 7487                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7488                                 strq->next_mid_unordered++;
 7489                         }
 7490                 } else {
 7491                         chk->rec.data.mid = strq->next_mid_ordered;
 7492                         if (rcv_flags & SCTP_DATA_LAST_FRAG) {
 7493                                 strq->next_mid_ordered++;
 7494                         }
 7495                 }
 7496         }
 7497         chk->rec.data.sid = sp->sid;
 7498         chk->rec.data.ppid = sp->ppid;
 7499         chk->rec.data.context = sp->context;
 7500         chk->rec.data.doing_fast_retransmit = 0;
 7501 
 7502         chk->rec.data.timetodrop = sp->ts;
 7503         chk->flags = sp->act_flags;
 7504 
 7505         if (sp->net) {
 7506                 chk->whoTo = sp->net;
 7507                 atomic_add_int(&chk->whoTo->ref_count, 1);
 7508         } else
 7509                 chk->whoTo = NULL;
 7510 
 7511         if (sp->holds_key_ref) {
 7512                 chk->auth_keyid = sp->auth_keyid;
 7513                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
 7514                 chk->holds_key_ref = 1;
 7515         }
 7516         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, to_move);
 7517         chk->rec.data.tsn = atomic_fetchadd_int(&asoc->sending_seq, 1);
 7518         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
 7519                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 7520                     (uint32_t)(uintptr_t)stcb, sp->length,
 7521                     (uint32_t)((chk->rec.data.sid << 16) | (0x0000ffff & chk->rec.data.mid)),
 7522                     chk->rec.data.tsn);
 7523         }
 7524         if (stcb->asoc.idata_supported == 0) {
 7525                 dchkh = mtod(chk->data, struct sctp_data_chunk *);
 7526         } else {
 7527                 ndchkh = mtod(chk->data, struct sctp_idata_chunk *);
 7528         }
 7529         /*
 7530          * Put the rest of the things in place now. Size was done earlier in
 7531          * previous loop prior to padding.
 7532          */
 7533 
 7534         SCTP_TCB_LOCK_ASSERT(stcb);
 7535 #ifdef SCTP_ASOCLOG_OF_TSNS
 7536         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 7537                 asoc->tsn_out_at = 0;
 7538                 asoc->tsn_out_wrapped = 1;
 7539         }
 7540         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.tsn;
 7541         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.sid;
 7542         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.mid;
 7543         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 7544         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 7545         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 7546         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 7547         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 7548         asoc->tsn_out_at++;
 7549 #endif
 7550         if (stcb->asoc.idata_supported == 0) {
 7551                 dchkh->ch.chunk_type = SCTP_DATA;
 7552                 dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7553                 dchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7554                 dchkh->dp.sid = htons(strq->sid);
 7555                 dchkh->dp.ssn = htons((uint16_t)chk->rec.data.mid);
 7556                 dchkh->dp.ppid = chk->rec.data.ppid;
 7557                 dchkh->ch.chunk_length = htons(chk->send_size);
 7558         } else {
 7559                 ndchkh->ch.chunk_type = SCTP_IDATA;
 7560                 ndchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7561                 ndchkh->dp.tsn = htonl(chk->rec.data.tsn);
 7562                 ndchkh->dp.sid = htons(strq->sid);
 7563                 ndchkh->dp.reserved = htons(0);
 7564                 ndchkh->dp.mid = htonl(chk->rec.data.mid);
 7565                 if (sp->fsn == 0)
 7566                         ndchkh->dp.ppid_fsn.ppid = chk->rec.data.ppid;
 7567                 else
 7568                         ndchkh->dp.ppid_fsn.fsn = htonl(sp->fsn);
 7569                 sp->fsn++;
 7570                 ndchkh->ch.chunk_length = htons(chk->send_size);
 7571         }
 7572         /* Now advance the chk->send_size by the actual pad needed. */
 7573         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 7574                 /* need a pad */
 7575                 struct mbuf *lm;
 7576                 int pads;
 7577 
 7578                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 7579                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
 7580                 if (lm != NULL) {
 7581                         chk->last_mbuf = lm;
 7582                         chk->pad_inplace = 1;
 7583                 }
 7584                 chk->send_size += pads;
 7585         }
 7586         if (PR_SCTP_ENABLED(chk->flags)) {
 7587                 asoc->pr_sctp_cnt++;
 7588         }
 7589         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 7590                 /* All done pull and kill the message */
 7591                 if (sp->put_last_out == 0) {
 7592                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 7593                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
 7594                             sp->sender_all_done,
 7595                             sp->length,
 7596                             sp->msg_is_complete,
 7597                             sp->put_last_out);
 7598                 }
 7599                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7600                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 7601                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp);
 7602                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7603                     (strq->chunks_on_queues == 0) &&
 7604                     TAILQ_EMPTY(&strq->outqueue)) {
 7605                         stcb->asoc.trigger_reset = 1;
 7606                 }
 7607                 if (sp->net) {
 7608                         sctp_free_remote_addr(sp->net);
 7609                         sp->net = NULL;
 7610                 }
 7611                 if (sp->data) {
 7612                         sctp_m_freem(sp->data);
 7613                         sp->data = NULL;
 7614                 }
 7615                 sctp_free_a_strmoq(stcb, sp, so_locked);
 7616         }
 7617         asoc->chunks_on_out_queue++;
 7618         strq->chunks_on_queues++;
 7619         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 7620         asoc->send_queue_cnt++;
 7621 out_of:
 7622         return (to_move);
 7623 }
 7624 
 7625 static void
 7626 sctp_fill_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
 7627     uint32_t frag_point, int eeor_mode, int *quit_now,
 7628     int so_locked)
 7629 {
 7630         struct sctp_association *asoc;
 7631         struct sctp_stream_out *strq;
 7632         uint32_t space_left, moved, total_moved;
 7633         int bail, giveup;
 7634 
 7635         SCTP_TCB_LOCK_ASSERT(stcb);
 7636         asoc = &stcb->asoc;
 7637         total_moved = 0;
 7638         switch (net->ro._l_addr.sa.sa_family) {
 7639 #ifdef INET
 7640         case AF_INET:
 7641                 space_left = net->mtu - SCTP_MIN_V4_OVERHEAD;
 7642                 break;
 7643 #endif
 7644 #ifdef INET6
 7645         case AF_INET6:
 7646                 space_left = net->mtu - SCTP_MIN_OVERHEAD;
 7647                 break;
 7648 #endif
 7649         default:
 7650                 /* TSNH */
 7651                 space_left = net->mtu;
 7652                 break;
 7653         }
 7654         /* Need an allowance for the data chunk header too */
 7655         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7656 
 7657         /* must make even word boundary */
 7658         space_left &= 0xfffffffc;
 7659         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7660         giveup = 0;
 7661         bail = 0;
 7662         while ((space_left > 0) && (strq != NULL)) {
 7663                 moved = sctp_move_to_outqueue(stcb, net, strq, space_left,
 7664                     frag_point, &giveup, eeor_mode,
 7665                     &bail, so_locked);
 7666                 if ((giveup != 0) || (bail != 0)) {
 7667                         break;
 7668                 }
 7669                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7670                 total_moved += moved;
 7671                 if (space_left >= moved) {
 7672                         space_left -= moved;
 7673                 } else {
 7674                         space_left = 0;
 7675                 }
 7676                 if (space_left >= SCTP_DATA_CHUNK_OVERHEAD(stcb)) {
 7677                         space_left -= SCTP_DATA_CHUNK_OVERHEAD(stcb);
 7678                 } else {
 7679                         space_left = 0;
 7680                 }
 7681                 space_left &= 0xfffffffc;
 7682         }
 7683         if (bail != 0)
 7684                 *quit_now = 1;
 7685 
 7686         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
 7687 
 7688         if (total_moved == 0) {
 7689                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
 7690                     (net == stcb->asoc.primary_destination)) {
 7691                         /* ran dry for primary network net */
 7692                         SCTP_STAT_INCR(sctps_primary_randry);
 7693                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
 7694                         /* ran dry with CMT on */
 7695                         SCTP_STAT_INCR(sctps_cmt_randry);
 7696                 }
 7697         }
 7698 }
 7699 
 7700 void
 7701 sctp_fix_ecn_echo(struct sctp_association *asoc)
 7702 {
 7703         struct sctp_tmit_chunk *chk;
 7704 
 7705         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7706                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 7707                         chk->sent = SCTP_DATAGRAM_UNSENT;
 7708                 }
 7709         }
 7710 }
 7711 
 7712 void
 7713 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
 7714 {
 7715         struct sctp_association *asoc;
 7716         struct sctp_tmit_chunk *chk;
 7717         struct sctp_stream_queue_pending *sp;
 7718         unsigned int i;
 7719 
 7720         if (net == NULL) {
 7721                 return;
 7722         }
 7723         asoc = &stcb->asoc;
 7724         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 7725                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 7726                         if (sp->net == net) {
 7727                                 sctp_free_remote_addr(sp->net);
 7728                                 sp->net = NULL;
 7729                         }
 7730                 }
 7731         }
 7732         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7733                 if (chk->whoTo == net) {
 7734                         sctp_free_remote_addr(chk->whoTo);
 7735                         chk->whoTo = NULL;
 7736                 }
 7737         }
 7738 }
 7739 
 7740 int
 7741 sctp_med_chunk_output(struct sctp_inpcb *inp,
 7742     struct sctp_tcb *stcb,
 7743     struct sctp_association *asoc,
 7744     int *num_out,
 7745     int *reason_code,
 7746     int control_only, int from_where,
 7747     struct timeval *now, int *now_filled,
 7748     uint32_t frag_point, int so_locked)
 7749 {
 7750         /**
 7751          * Ok this is the generic chunk service queue. we must do the
 7752          * following:
 7753          * - Service the stream queue that is next, moving any
 7754          *   message (note I must get a complete message i.e. FIRST/MIDDLE and
 7755          *   LAST to the out queue in one pass) and assigning TSN's. This
 7756          *   only applies though if the peer does not support NDATA. For NDATA
 7757          *   chunks its ok to not send the entire message ;-)
 7758          * - Check to see if the cwnd/rwnd allows any output, if so we go ahead and
 7759          *   formulate and send the low level chunks. Making sure to combine
 7760          *   any control in the control chunk queue also.
 7761          */
 7762         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
 7763         struct mbuf *outchain, *endoutchain;
 7764         struct sctp_tmit_chunk *chk, *nchk;
 7765 
 7766         /* temp arrays for unlinking */
 7767         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 7768         int no_fragmentflg, error;
 7769         unsigned int max_rwnd_per_dest, max_send_per_dest;
 7770         int one_chunk, hbflag, skip_data_for_this_net;
 7771         int asconf, cookie, no_out_cnt;
 7772         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
 7773         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 7774         int tsns_sent = 0;
 7775         uint32_t auth_offset;
 7776         struct sctp_auth_chunk *auth;
 7777         uint16_t auth_keyid;
 7778         int override_ok = 1;
 7779         int skip_fill_up = 0;
 7780         int data_auth_reqd = 0;
 7781 
 7782         /*
 7783          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 7784          * destination.
 7785          */
 7786         int quit_now = 0;
 7787 
 7788         *num_out = 0;
 7789         *reason_code = 0;
 7790         auth_keyid = stcb->asoc.authinfo.active_keyid;
 7791         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 7792             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 7793             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 7794                 eeor_mode = 1;
 7795         } else {
 7796                 eeor_mode = 0;
 7797         }
 7798         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 7799         /*
 7800          * First lets prime the pump. For each destination, if there is room
 7801          * in the flight size, attempt to pull an MTU's worth out of the
 7802          * stream queues into the general send_queue
 7803          */
 7804 #ifdef SCTP_AUDITING_ENABLED
 7805         sctp_audit_log(0xC2, 2);
 7806 #endif
 7807         SCTP_TCB_LOCK_ASSERT(stcb);
 7808         hbflag = 0;
 7809         if (control_only)
 7810                 no_data_chunks = 1;
 7811         else
 7812                 no_data_chunks = 0;
 7813 
 7814         /* Nothing to possible to send? */
 7815         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
 7816             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
 7817             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7818             TAILQ_EMPTY(&asoc->send_queue) &&
 7819             sctp_is_there_unsent_data(stcb, so_locked) == 0) {
 7820 nothing_to_send:
 7821                 *reason_code = 9;
 7822                 return (0);
 7823         }
 7824         if (asoc->peers_rwnd == 0) {
 7825                 /* No room in peers rwnd */
 7826                 *reason_code = 1;
 7827                 if (asoc->total_flight > 0) {
 7828                         /* we are allowed one chunk in flight */
 7829                         no_data_chunks = 1;
 7830                 }
 7831         }
 7832         if (stcb->asoc.ecn_echo_cnt_onq) {
 7833                 /* Record where a sack goes, if any */
 7834                 if (no_data_chunks &&
 7835                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
 7836                         /* Nothing but ECNe to send - we don't do that */
 7837                         goto nothing_to_send;
 7838                 }
 7839                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7840                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7841                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 7842                                 sack_goes_to = chk->whoTo;
 7843                                 break;
 7844                         }
 7845                 }
 7846         }
 7847         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
 7848         if (stcb->sctp_socket)
 7849                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
 7850         else
 7851                 max_send_per_dest = 0;
 7852         if (no_data_chunks == 0) {
 7853                 /* How many non-directed chunks are there? */
 7854                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7855                         if (chk->whoTo == NULL) {
 7856                                 /*
 7857                                  * We already have non-directed chunks on
 7858                                  * the queue, no need to do a fill-up.
 7859                                  */
 7860                                 skip_fill_up = 1;
 7861                                 break;
 7862                         }
 7863                 }
 7864         }
 7865         if ((no_data_chunks == 0) &&
 7866             (skip_fill_up == 0) &&
 7867             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
 7868                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 7869                         /*
 7870                          * This for loop we are in takes in each net, if
 7871                          * its's got space in cwnd and has data sent to it
 7872                          * (when CMT is off) then it calls
 7873                          * sctp_fill_outqueue for the net. This gets data on
 7874                          * the send queue for that network.
 7875                          *
 7876                          * In sctp_fill_outqueue TSN's are assigned and data
 7877                          * is copied out of the stream buffers. Note mostly
 7878                          * copy by reference (we hope).
 7879                          */
 7880                         net->window_probe = 0;
 7881                         if ((net != stcb->asoc.alternate) &&
 7882                             ((net->dest_state & SCTP_ADDR_PF) ||
 7883                             ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) ||
 7884                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 7885                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7886                                         sctp_log_cwnd(stcb, net, 1,
 7887                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7888                                 }
 7889                                 continue;
 7890                         }
 7891                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 7892                             (net->flight_size == 0)) {
 7893                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 7894                         }
 7895                         if (net->flight_size >= net->cwnd) {
 7896                                 /* skip this network, no room - can't fill */
 7897                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7898                                         sctp_log_cwnd(stcb, net, 3,
 7899                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7900                                 }
 7901                                 continue;
 7902                         }
 7903                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7904                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7905                         }
 7906                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
 7907                         if (quit_now) {
 7908                                 /* memory alloc failure */
 7909                                 no_data_chunks = 1;
 7910                                 break;
 7911                         }
 7912                 }
 7913         }
 7914         /* now service each destination and send out what we can for it */
 7915         /* Nothing to send? */
 7916         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 7917             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7918             TAILQ_EMPTY(&asoc->send_queue)) {
 7919                 *reason_code = 8;
 7920                 return (0);
 7921         }
 7922 
 7923         if (asoc->sctp_cmt_on_off > 0) {
 7924                 /* get the last start point */
 7925                 start_at = asoc->last_net_cmt_send_started;
 7926                 if (start_at == NULL) {
 7927                         /* null so to beginning */
 7928                         start_at = TAILQ_FIRST(&asoc->nets);
 7929                 } else {
 7930                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
 7931                         if (start_at == NULL) {
 7932                                 start_at = TAILQ_FIRST(&asoc->nets);
 7933                         }
 7934                 }
 7935                 asoc->last_net_cmt_send_started = start_at;
 7936         } else {
 7937                 start_at = TAILQ_FIRST(&asoc->nets);
 7938         }
 7939         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7940                 if (chk->whoTo == NULL) {
 7941                         if (asoc->alternate) {
 7942                                 chk->whoTo = asoc->alternate;
 7943                         } else {
 7944                                 chk->whoTo = asoc->primary_destination;
 7945                         }
 7946                         atomic_add_int(&chk->whoTo->ref_count, 1);
 7947                 }
 7948         }
 7949         old_start_at = NULL;
 7950 again_one_more_time:
 7951         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 7952                 /* how much can we send? */
 7953                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 7954                 if (old_start_at && (old_start_at == net)) {
 7955                         /* through list completely. */
 7956                         break;
 7957                 }
 7958                 tsns_sent = 0xa;
 7959                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 7960                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7961                     (net->flight_size >= net->cwnd)) {
 7962                         /*
 7963                          * Nothing on control or asconf and flight is full,
 7964                          * we can skip even in the CMT case.
 7965                          */
 7966                         continue;
 7967                 }
 7968                 bundle_at = 0;
 7969                 endoutchain = outchain = NULL;
 7970                 auth = NULL;
 7971                 auth_offset = 0;
 7972                 no_fragmentflg = 1;
 7973                 one_chunk = 0;
 7974                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 7975                         skip_data_for_this_net = 1;
 7976                 } else {
 7977                         skip_data_for_this_net = 0;
 7978                 }
 7979                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 7980 #ifdef INET
 7981                 case AF_INET:
 7982                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 7983                         break;
 7984 #endif
 7985 #ifdef INET6
 7986                 case AF_INET6:
 7987                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 7988                         break;
 7989 #endif
 7990                 default:
 7991                         /* TSNH */
 7992                         mtu = net->mtu;
 7993                         break;
 7994                 }
 7995                 mx_mtu = mtu;
 7996                 to_out = 0;
 7997                 if (mtu > asoc->peers_rwnd) {
 7998                         if (asoc->total_flight > 0) {
 7999                                 /* We have a packet in flight somewhere */
 8000                                 r_mtu = asoc->peers_rwnd;
 8001                         } else {
 8002                                 /* We are always allowed to send one MTU out */
 8003                                 one_chunk = 1;
 8004                                 r_mtu = mtu;
 8005                         }
 8006                 } else {
 8007                         r_mtu = mtu;
 8008                 }
 8009                 error = 0;
 8010                 /************************/
 8011                 /* ASCONF transmission */
 8012                 /************************/
 8013                 /* Now first lets go through the asconf queue */
 8014                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 8015                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
 8016                                 continue;
 8017                         }
 8018                         if (chk->whoTo == NULL) {
 8019                                 if (asoc->alternate == NULL) {
 8020                                         if (asoc->primary_destination != net) {
 8021                                                 break;
 8022                                         }
 8023                                 } else {
 8024                                         if (asoc->alternate != net) {
 8025                                                 break;
 8026                                         }
 8027                                 }
 8028                         } else {
 8029                                 if (chk->whoTo != net) {
 8030                                         break;
 8031                                 }
 8032                         }
 8033                         if (chk->data == NULL) {
 8034                                 break;
 8035                         }
 8036                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
 8037                             chk->sent != SCTP_DATAGRAM_RESEND) {
 8038                                 break;
 8039                         }
 8040                         /*
 8041                          * if no AUTH is yet included and this chunk
 8042                          * requires it, make sure to account for it.  We
 8043                          * don't apply the size until the AUTH chunk is
 8044                          * actually added below in case there is no room for
 8045                          * this chunk. NOTE: we overload the use of "omtu"
 8046                          * here
 8047                          */
 8048                         if ((auth == NULL) &&
 8049                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8050                             stcb->asoc.peer_auth_chunks)) {
 8051                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8052                         } else
 8053                                 omtu = 0;
 8054                         /* Here we do NOT factor the r_mtu */
 8055                         if ((chk->send_size < (int)(mtu - omtu)) ||
 8056                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8057                                 /*
 8058                                  * We probably should glom the mbuf chain
 8059                                  * from the chk->data for control but the
 8060                                  * problem is it becomes yet one more level
 8061                                  * of tracking to do if for some reason
 8062                                  * output fails. Then I have got to
 8063                                  * reconstruct the merged control chain.. el
 8064                                  * yucko.. for now we take the easy way and
 8065                                  * do the copy
 8066                                  */
 8067                                 /*
 8068                                  * Add an AUTH chunk, if chunk requires it
 8069                                  * save the offset into the chain for AUTH
 8070                                  */
 8071                                 if ((auth == NULL) &&
 8072                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8073                                     stcb->asoc.peer_auth_chunks))) {
 8074                                         outchain = sctp_add_auth_chunk(outchain,
 8075                                             &endoutchain,
 8076                                             &auth,
 8077                                             &auth_offset,
 8078                                             stcb,
 8079                                             chk->rec.chunk_id.id);
 8080                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8081                                 }
 8082                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8083                                     (int)chk->rec.chunk_id.can_take_data,
 8084                                     chk->send_size, chk->copy_by_ref);
 8085                                 if (outchain == NULL) {
 8086                                         *reason_code = 8;
 8087                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8088                                         return (ENOMEM);
 8089                                 }
 8090                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8091                                 /* update our MTU size */
 8092                                 if (mtu > (chk->send_size + omtu))
 8093                                         mtu -= (chk->send_size + omtu);
 8094                                 else
 8095                                         mtu = 0;
 8096                                 to_out += (chk->send_size + omtu);
 8097                                 /* Do clear IP_DF ? */
 8098                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8099                                         no_fragmentflg = 0;
 8100                                 }
 8101                                 if (chk->rec.chunk_id.can_take_data)
 8102                                         chk->data = NULL;
 8103                                 /*
 8104                                  * set hb flag since we can use these for
 8105                                  * RTO
 8106                                  */
 8107                                 hbflag = 1;
 8108                                 asconf = 1;
 8109                                 /*
 8110                                  * should sysctl this: don't bundle data
 8111                                  * with ASCONF since it requires AUTH
 8112                                  */
 8113                                 no_data_chunks = 1;
 8114                                 chk->sent = SCTP_DATAGRAM_SENT;
 8115                                 if (chk->whoTo == NULL) {
 8116                                         chk->whoTo = net;
 8117                                         atomic_add_int(&net->ref_count, 1);
 8118                                 }
 8119                                 chk->snd_count++;
 8120                                 if (mtu == 0) {
 8121                                         /*
 8122                                          * Ok we are out of room but we can
 8123                                          * output without effecting the
 8124                                          * flight size since this little guy
 8125                                          * is a control only packet.
 8126                                          */
 8127                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8128                                         /*
 8129                                          * do NOT clear the asconf flag as
 8130                                          * it is used to do appropriate
 8131                                          * source address selection.
 8132                                          */
 8133                                         if (*now_filled == 0) {
 8134                                                 (void)SCTP_GETTIME_TIMEVAL(now);
 8135                                                 *now_filled = 1;
 8136                                         }
 8137                                         net->last_sent_time = *now;
 8138                                         hbflag = 0;
 8139                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8140                                             (struct sockaddr *)&net->ro._l_addr,
 8141                                             outchain, auth_offset, auth,
 8142                                             stcb->asoc.authinfo.active_keyid,
 8143                                             no_fragmentflg, 0, asconf,
 8144                                             inp->sctp_lport, stcb->rport,
 8145                                             htonl(stcb->asoc.peer_vtag),
 8146                                             net->port, NULL,
 8147                                             0, 0,
 8148                                             so_locked))) {
 8149                                                 /*
 8150                                                  * error, we could not
 8151                                                  * output
 8152                                                  */
 8153                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8154                                                 if (from_where == 0) {
 8155                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8156                                                 }
 8157                                                 if (error == ENOBUFS) {
 8158                                                         asoc->ifp_had_enobuf = 1;
 8159                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8160                                                 }
 8161                                                 /* error, could not output */
 8162                                                 if (error == EHOSTUNREACH) {
 8163                                                         /*
 8164                                                          * Destination went
 8165                                                          * unreachable
 8166                                                          * during this send
 8167                                                          */
 8168                                                         sctp_move_chunks_from_net(stcb, net);
 8169                                                 }
 8170                                                 *reason_code = 7;
 8171                                                 break;
 8172                                         } else {
 8173                                                 asoc->ifp_had_enobuf = 0;
 8174                                         }
 8175                                         /*
 8176                                          * increase the number we sent, if a
 8177                                          * cookie is sent we don't tell them
 8178                                          * any was sent out.
 8179                                          */
 8180                                         outchain = endoutchain = NULL;
 8181                                         auth = NULL;
 8182                                         auth_offset = 0;
 8183                                         if (!no_out_cnt)
 8184                                                 *num_out += ctl_cnt;
 8185                                         /* recalc a clean slate and setup */
 8186                                         switch (net->ro._l_addr.sa.sa_family) {
 8187 #ifdef INET
 8188                                         case AF_INET:
 8189                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8190                                                 break;
 8191 #endif
 8192 #ifdef INET6
 8193                                         case AF_INET6:
 8194                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8195                                                 break;
 8196 #endif
 8197                                         default:
 8198                                                 /* TSNH */
 8199                                                 mtu = net->mtu;
 8200                                                 break;
 8201                                         }
 8202                                         to_out = 0;
 8203                                         no_fragmentflg = 1;
 8204                                 }
 8205                         }
 8206                 }
 8207                 if (error != 0) {
 8208                         /* try next net */
 8209                         continue;
 8210                 }
 8211                 /************************/
 8212                 /* Control transmission */
 8213                 /************************/
 8214                 /* Now first lets go through the control queue */
 8215                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 8216                         if ((sack_goes_to) &&
 8217                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
 8218                             (chk->whoTo != sack_goes_to)) {
 8219                                 /*
 8220                                  * if we have a sack in queue, and we are
 8221                                  * looking at an ecn echo that is NOT queued
 8222                                  * to where the sack is going..
 8223                                  */
 8224                                 if (chk->whoTo == net) {
 8225                                         /*
 8226                                          * Don't transmit it to where its
 8227                                          * going (current net)
 8228                                          */
 8229                                         continue;
 8230                                 } else if (sack_goes_to == net) {
 8231                                         /*
 8232                                          * But do transmit it to this
 8233                                          * address
 8234                                          */
 8235                                         goto skip_net_check;
 8236                                 }
 8237                         }
 8238                         if (chk->whoTo == NULL) {
 8239                                 if (asoc->alternate == NULL) {
 8240                                         if (asoc->primary_destination != net) {
 8241                                                 continue;
 8242                                         }
 8243                                 } else {
 8244                                         if (asoc->alternate != net) {
 8245                                                 continue;
 8246                                         }
 8247                                 }
 8248                         } else {
 8249                                 if (chk->whoTo != net) {
 8250                                         continue;
 8251                                 }
 8252                         }
 8253         skip_net_check:
 8254                         if (chk->data == NULL) {
 8255                                 continue;
 8256                         }
 8257                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 8258                                 /*
 8259                                  * It must be unsent. Cookies and ASCONF's
 8260                                  * hang around but there timers will force
 8261                                  * when marked for resend.
 8262                                  */
 8263                                 continue;
 8264                         }
 8265                         /*
 8266                          * if no AUTH is yet included and this chunk
 8267                          * requires it, make sure to account for it.  We
 8268                          * don't apply the size until the AUTH chunk is
 8269                          * actually added below in case there is no room for
 8270                          * this chunk. NOTE: we overload the use of "omtu"
 8271                          * here
 8272                          */
 8273                         if ((auth == NULL) &&
 8274                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8275                             stcb->asoc.peer_auth_chunks)) {
 8276                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8277                         } else
 8278                                 omtu = 0;
 8279                         /* Here we do NOT factor the r_mtu */
 8280                         if ((chk->send_size <= (int)(mtu - omtu)) ||
 8281                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8282                                 /*
 8283                                  * We probably should glom the mbuf chain
 8284                                  * from the chk->data for control but the
 8285                                  * problem is it becomes yet one more level
 8286                                  * of tracking to do if for some reason
 8287                                  * output fails. Then I have got to
 8288                                  * reconstruct the merged control chain.. el
 8289                                  * yucko.. for now we take the easy way and
 8290                                  * do the copy
 8291                                  */
 8292                                 /*
 8293                                  * Add an AUTH chunk, if chunk requires it
 8294                                  * save the offset into the chain for AUTH
 8295                                  */
 8296                                 if ((auth == NULL) &&
 8297                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8298                                     stcb->asoc.peer_auth_chunks))) {
 8299                                         outchain = sctp_add_auth_chunk(outchain,
 8300                                             &endoutchain,
 8301                                             &auth,
 8302                                             &auth_offset,
 8303                                             stcb,
 8304                                             chk->rec.chunk_id.id);
 8305                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8306                                 }
 8307                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8308                                     (int)chk->rec.chunk_id.can_take_data,
 8309                                     chk->send_size, chk->copy_by_ref);
 8310                                 if (outchain == NULL) {
 8311                                         *reason_code = 8;
 8312                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8313                                         return (ENOMEM);
 8314                                 }
 8315                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8316                                 /* update our MTU size */
 8317                                 if (mtu > (chk->send_size + omtu))
 8318                                         mtu -= (chk->send_size + omtu);
 8319                                 else
 8320                                         mtu = 0;
 8321                                 to_out += (chk->send_size + omtu);
 8322                                 /* Do clear IP_DF ? */
 8323                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8324                                         no_fragmentflg = 0;
 8325                                 }
 8326                                 if (chk->rec.chunk_id.can_take_data)
 8327                                         chk->data = NULL;
 8328                                 /* Mark things to be removed, if needed */
 8329                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8330                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 8331                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 8332                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 8333                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 8334                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 8335                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 8336                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 8337                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 8338                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 8339                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 8340                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 8341                                                 hbflag = 1;
 8342                                         }
 8343                                         /* remove these chunks at the end */
 8344                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8345                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 8346                                                 /* turn off the timer */
 8347                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 8348                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 8349                                                             inp, stcb, NULL,
 8350                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 8351                                                 }
 8352                                         }
 8353                                         ctl_cnt++;
 8354                                 } else {
 8355                                         /*
 8356                                          * Other chunks, since they have
 8357                                          * timers running (i.e. COOKIE) we
 8358                                          * just "trust" that it gets sent or
 8359                                          * retransmitted.
 8360                                          */
 8361                                         ctl_cnt++;
 8362                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8363                                                 cookie = 1;
 8364                                                 no_out_cnt = 1;
 8365                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 8366                                                 /*
 8367                                                  * Increment ecne send count
 8368                                                  * here this means we may be
 8369                                                  * over-zealous in our
 8370                                                  * counting if the send
 8371                                                  * fails, but its the best
 8372                                                  * place to do it (we used
 8373                                                  * to do it in the queue of
 8374                                                  * the chunk, but that did
 8375                                                  * not tell how many times
 8376                                                  * it was sent.
 8377                                                  */
 8378                                                 SCTP_STAT_INCR(sctps_sendecne);
 8379                                         }
 8380                                         chk->sent = SCTP_DATAGRAM_SENT;
 8381                                         if (chk->whoTo == NULL) {
 8382                                                 chk->whoTo = net;
 8383                                                 atomic_add_int(&net->ref_count, 1);
 8384                                         }
 8385                                         chk->snd_count++;
 8386                                 }
 8387                                 if (mtu == 0) {
 8388                                         /*
 8389                                          * Ok we are out of room but we can
 8390                                          * output without effecting the
 8391                                          * flight size since this little guy
 8392                                          * is a control only packet.
 8393                                          */
 8394                                         if (asconf) {
 8395                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8396                                                 /*
 8397                                                  * do NOT clear the asconf
 8398                                                  * flag as it is used to do
 8399                                                  * appropriate source
 8400                                                  * address selection.
 8401                                                  */
 8402                                         }
 8403                                         if (cookie) {
 8404                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8405                                                 cookie = 0;
 8406                                         }
 8407                                         /* Only HB or ASCONF advances time */
 8408                                         if (hbflag) {
 8409                                                 if (*now_filled == 0) {
 8410                                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8411                                                         *now_filled = 1;
 8412                                                 }
 8413                                                 net->last_sent_time = *now;
 8414                                                 hbflag = 0;
 8415                                         }
 8416                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8417                                             (struct sockaddr *)&net->ro._l_addr,
 8418                                             outchain,
 8419                                             auth_offset, auth,
 8420                                             stcb->asoc.authinfo.active_keyid,
 8421                                             no_fragmentflg, 0, asconf,
 8422                                             inp->sctp_lport, stcb->rport,
 8423                                             htonl(stcb->asoc.peer_vtag),
 8424                                             net->port, NULL,
 8425                                             0, 0,
 8426                                             so_locked))) {
 8427                                                 /*
 8428                                                  * error, we could not
 8429                                                  * output
 8430                                                  */
 8431                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8432                                                 if (from_where == 0) {
 8433                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8434                                                 }
 8435                                                 if (error == ENOBUFS) {
 8436                                                         asoc->ifp_had_enobuf = 1;
 8437                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8438                                                 }
 8439                                                 if (error == EHOSTUNREACH) {
 8440                                                         /*
 8441                                                          * Destination went
 8442                                                          * unreachable
 8443                                                          * during this send
 8444                                                          */
 8445                                                         sctp_move_chunks_from_net(stcb, net);
 8446                                                 }
 8447                                                 *reason_code = 7;
 8448                                                 break;
 8449                                         } else {
 8450                                                 asoc->ifp_had_enobuf = 0;
 8451                                         }
 8452                                         /*
 8453                                          * increase the number we sent, if a
 8454                                          * cookie is sent we don't tell them
 8455                                          * any was sent out.
 8456                                          */
 8457                                         outchain = endoutchain = NULL;
 8458                                         auth = NULL;
 8459                                         auth_offset = 0;
 8460                                         if (!no_out_cnt)
 8461                                                 *num_out += ctl_cnt;
 8462                                         /* recalc a clean slate and setup */
 8463                                         switch (net->ro._l_addr.sa.sa_family) {
 8464 #ifdef INET
 8465                                         case AF_INET:
 8466                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8467                                                 break;
 8468 #endif
 8469 #ifdef INET6
 8470                                         case AF_INET6:
 8471                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8472                                                 break;
 8473 #endif
 8474                                         default:
 8475                                                 /* TSNH */
 8476                                                 mtu = net->mtu;
 8477                                                 break;
 8478                                         }
 8479                                         to_out = 0;
 8480                                         no_fragmentflg = 1;
 8481                                 }
 8482                         }
 8483                 }
 8484                 if (error != 0) {
 8485                         /* try next net */
 8486                         continue;
 8487                 }
 8488                 /* JRI: if dest is in PF state, do not send data to it */
 8489                 if ((asoc->sctp_cmt_on_off > 0) &&
 8490                     (net != stcb->asoc.alternate) &&
 8491                     (net->dest_state & SCTP_ADDR_PF)) {
 8492                         goto no_data_fill;
 8493                 }
 8494                 if (net->flight_size >= net->cwnd) {
 8495                         goto no_data_fill;
 8496                 }
 8497                 if ((asoc->sctp_cmt_on_off > 0) &&
 8498                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
 8499                     (net->flight_size > max_rwnd_per_dest)) {
 8500                         goto no_data_fill;
 8501                 }
 8502                 /*
 8503                  * We need a specific accounting for the usage of the send
 8504                  * buffer. We also need to check the number of messages per
 8505                  * net. For now, this is better than nothing and it disabled
 8506                  * by default...
 8507                  */
 8508                 if ((asoc->sctp_cmt_on_off > 0) &&
 8509                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
 8510                     (max_send_per_dest > 0) &&
 8511                     (net->flight_size > max_send_per_dest)) {
 8512                         goto no_data_fill;
 8513                 }
 8514                 /*********************/
 8515                 /* Data transmission */
 8516                 /*********************/
 8517                 /*
 8518                  * if AUTH for DATA is required and no AUTH has been added
 8519                  * yet, account for this in the mtu now... if no data can be
 8520                  * bundled, this adjustment won't matter anyways since the
 8521                  * packet will be going out...
 8522                  */
 8523                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
 8524                     stcb->asoc.peer_auth_chunks);
 8525                 if (data_auth_reqd && (auth == NULL)) {
 8526                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8527                 }
 8528                 /* now lets add any data within the MTU constraints */
 8529                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8530 #ifdef INET
 8531                 case AF_INET:
 8532                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
 8533                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8534                         else
 8535                                 omtu = 0;
 8536                         break;
 8537 #endif
 8538 #ifdef INET6
 8539                 case AF_INET6:
 8540                         if (net->mtu > SCTP_MIN_OVERHEAD)
 8541                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
 8542                         else
 8543                                 omtu = 0;
 8544                         break;
 8545 #endif
 8546                 default:
 8547                         /* TSNH */
 8548                         omtu = 0;
 8549                         break;
 8550                 }
 8551                 if ((((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
 8552                     (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 8553                     (skip_data_for_this_net == 0)) ||
 8554                     (cookie)) {
 8555                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 8556                                 if (no_data_chunks) {
 8557                                         /* let only control go out */
 8558                                         *reason_code = 1;
 8559                                         break;
 8560                                 }
 8561                                 if (net->flight_size >= net->cwnd) {
 8562                                         /* skip this net, no room for data */
 8563                                         *reason_code = 2;
 8564                                         break;
 8565                                 }
 8566                                 if ((chk->whoTo != NULL) &&
 8567                                     (chk->whoTo != net)) {
 8568                                         /* Don't send the chunk on this net */
 8569                                         continue;
 8570                                 }
 8571 
 8572                                 if (asoc->sctp_cmt_on_off == 0) {
 8573                                         if ((asoc->alternate) &&
 8574                                             (asoc->alternate != net) &&
 8575                                             (chk->whoTo == NULL)) {
 8576                                                 continue;
 8577                                         } else if ((net != asoc->primary_destination) &&
 8578                                                     (asoc->alternate == NULL) &&
 8579                                             (chk->whoTo == NULL)) {
 8580                                                 continue;
 8581                                         }
 8582                                 }
 8583                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 8584                                         /*-
 8585                                          * strange, we have a chunk that is
 8586                                          * to big for its destination and
 8587                                          * yet no fragment ok flag.
 8588                                          * Something went wrong when the
 8589                                          * PMTU changed...we did not mark
 8590                                          * this chunk for some reason?? I
 8591                                          * will fix it here by letting IP
 8592                                          * fragment it for now and printing
 8593                                          * a warning. This really should not
 8594                                          * happen ...
 8595                                          */
 8596                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 8597                                             chk->send_size, mtu);
 8598                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 8599                                 }
 8600                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 8601                                     (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
 8602                                         struct sctp_data_chunk *dchkh;
 8603 
 8604                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 8605                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 8606                                 }
 8607                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 8608                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 8609                                         /* ok we will add this one */
 8610 
 8611                                         /*
 8612                                          * Add an AUTH chunk, if chunk
 8613                                          * requires it, save the offset into
 8614                                          * the chain for AUTH
 8615                                          */
 8616                                         if (data_auth_reqd) {
 8617                                                 if (auth == NULL) {
 8618                                                         outchain = sctp_add_auth_chunk(outchain,
 8619                                                             &endoutchain,
 8620                                                             &auth,
 8621                                                             &auth_offset,
 8622                                                             stcb,
 8623                                                             SCTP_DATA);
 8624                                                         auth_keyid = chk->auth_keyid;
 8625                                                         override_ok = 0;
 8626                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8627                                                 } else if (override_ok) {
 8628                                                         /*
 8629                                                          * use this data's
 8630                                                          * keyid
 8631                                                          */
 8632                                                         auth_keyid = chk->auth_keyid;
 8633                                                         override_ok = 0;
 8634                                                 } else if (auth_keyid != chk->auth_keyid) {
 8635                                                         /*
 8636                                                          * different keyid,
 8637                                                          * so done bundling
 8638                                                          */
 8639                                                         break;
 8640                                                 }
 8641                                         }
 8642                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 8643                                             chk->send_size, chk->copy_by_ref);
 8644                                         if (outchain == NULL) {
 8645                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 8646                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8647                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8648                                                 }
 8649                                                 *reason_code = 3;
 8650                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8651                                                 return (ENOMEM);
 8652                                         }
 8653                                         /* update our MTU size */
 8654                                         /* Do clear IP_DF ? */
 8655                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8656                                                 no_fragmentflg = 0;
 8657                                         }
 8658                                         /* unsigned subtraction of mtu */
 8659                                         if (mtu > chk->send_size)
 8660                                                 mtu -= chk->send_size;
 8661                                         else
 8662                                                 mtu = 0;
 8663                                         /* unsigned subtraction of r_mtu */
 8664                                         if (r_mtu > chk->send_size)
 8665                                                 r_mtu -= chk->send_size;
 8666                                         else
 8667                                                 r_mtu = 0;
 8668 
 8669                                         to_out += chk->send_size;
 8670                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 8671 #ifdef INVARIANTS
 8672                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
 8673 #else
 8674                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
 8675                                                     mx_mtu, to_out);
 8676 #endif
 8677                                         }
 8678                                         chk->window_probe = 0;
 8679                                         data_list[bundle_at++] = chk;
 8680                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 8681                                                 break;
 8682                                         }
 8683                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
 8684                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 8685                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
 8686                                                 } else {
 8687                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
 8688                                                 }
 8689                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
 8690                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
 8691                                                         /*
 8692                                                          * Count number of
 8693                                                          * user msg's that
 8694                                                          * were fragmented
 8695                                                          * we do this by
 8696                                                          * counting when we
 8697                                                          * see a LAST
 8698                                                          * fragment only.
 8699                                                          */
 8700                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
 8701                                         }
 8702                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
 8703                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
 8704                                                         data_list[0]->window_probe = 1;
 8705                                                         net->window_probe = 1;
 8706                                                 }
 8707                                                 break;
 8708                                         }
 8709                                 } else {
 8710                                         /*
 8711                                          * Must be sent in order of the
 8712                                          * TSN's (on a network)
 8713                                          */
 8714                                         break;
 8715                                 }
 8716                         }       /* for (chunk gather loop for this net) */
 8717                 }               /* if asoc.state OPEN */
 8718 no_data_fill:
 8719                 /* Is there something to send for this destination? */
 8720                 if (outchain) {
 8721                         /* We may need to start a control timer or two */
 8722                         if (asconf) {
 8723                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
 8724                                     stcb, net);
 8725                                 /*
 8726                                  * do NOT clear the asconf flag as it is
 8727                                  * used to do appropriate source address
 8728                                  * selection.
 8729                                  */
 8730                         }
 8731                         if (cookie) {
 8732                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8733                                 cookie = 0;
 8734                         }
 8735                         /* must start a send timer if data is being sent */
 8736                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 8737                                 /*
 8738                                  * no timer running on this destination
 8739                                  * restart it.
 8740                                  */
 8741                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8742                         }
 8743                         if (bundle_at || hbflag) {
 8744                                 /* For data/asconf and hb set time */
 8745                                 if (*now_filled == 0) {
 8746                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8747                                         *now_filled = 1;
 8748                                 }
 8749                                 net->last_sent_time = *now;
 8750                         }
 8751                         /* Now send it, if there is anything to send :> */
 8752                         if ((error = sctp_lowlevel_chunk_output(inp,
 8753                             stcb,
 8754                             net,
 8755                             (struct sockaddr *)&net->ro._l_addr,
 8756                             outchain,
 8757                             auth_offset,
 8758                             auth,
 8759                             auth_keyid,
 8760                             no_fragmentflg,
 8761                             bundle_at,
 8762                             asconf,
 8763                             inp->sctp_lport, stcb->rport,
 8764                             htonl(stcb->asoc.peer_vtag),
 8765                             net->port, NULL,
 8766                             0, 0,
 8767                             so_locked))) {
 8768                                 /* error, we could not output */
 8769                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8770                                 if (from_where == 0) {
 8771                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8772                                 }
 8773                                 if (error == ENOBUFS) {
 8774                                         asoc->ifp_had_enobuf = 1;
 8775                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8776                                 }
 8777                                 if (error == EHOSTUNREACH) {
 8778                                         /*
 8779                                          * Destination went unreachable
 8780                                          * during this send
 8781                                          */
 8782                                         sctp_move_chunks_from_net(stcb, net);
 8783                                 }
 8784                                 *reason_code = 6;
 8785                                 /*-
 8786                                  * I add this line to be paranoid. As far as
 8787                                  * I can tell the continue, takes us back to
 8788                                  * the top of the for, but just to make sure
 8789                                  * I will reset these again here.
 8790                                  */
 8791                                 ctl_cnt = 0;
 8792                                 continue;       /* This takes us back to the
 8793                                                  * for() for the nets. */
 8794                         } else {
 8795                                 asoc->ifp_had_enobuf = 0;
 8796                         }
 8797                         endoutchain = NULL;
 8798                         auth = NULL;
 8799                         auth_offset = 0;
 8800                         if (!no_out_cnt) {
 8801                                 *num_out += (ctl_cnt + bundle_at);
 8802                         }
 8803                         if (bundle_at) {
 8804                                 /* setup for a RTO measurement */
 8805                                 tsns_sent = data_list[0]->rec.data.tsn;
 8806                                 /* fill time if not already filled */
 8807                                 if (*now_filled == 0) {
 8808                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 8809                                         *now_filled = 1;
 8810                                         *now = asoc->time_last_sent;
 8811                                 } else {
 8812                                         asoc->time_last_sent = *now;
 8813                                 }
 8814                                 if (net->rto_needed) {
 8815                                         data_list[0]->do_rtt = 1;
 8816                                         net->rto_needed = 0;
 8817                                 }
 8818                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
 8819                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
 8820                         }
 8821                         if (one_chunk) {
 8822                                 break;
 8823                         }
 8824                 }
 8825                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8826                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
 8827                 }
 8828         }
 8829         if (old_start_at == NULL) {
 8830                 old_start_at = start_at;
 8831                 start_at = TAILQ_FIRST(&asoc->nets);
 8832                 if (old_start_at)
 8833                         goto again_one_more_time;
 8834         }
 8835 
 8836         /*
 8837          * At the end there should be no NON timed chunks hanging on this
 8838          * queue.
 8839          */
 8840         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8841                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
 8842         }
 8843         if ((*num_out == 0) && (*reason_code == 0)) {
 8844                 *reason_code = 4;
 8845         } else {
 8846                 *reason_code = 5;
 8847         }
 8848         sctp_clean_up_ctl(stcb, asoc, so_locked);
 8849         return (0);
 8850 }
 8851 
 8852 void
 8853 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
 8854 {
 8855         /*-
 8856          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 8857          * the control chunk queue.
 8858          */
 8859         struct sctp_chunkhdr *hdr;
 8860         struct sctp_tmit_chunk *chk;
 8861         struct mbuf *mat, *last_mbuf;
 8862         uint32_t chunk_length;
 8863         uint16_t padding_length;
 8864 
 8865         SCTP_TCB_LOCK_ASSERT(stcb);
 8866         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
 8867         if (op_err == NULL) {
 8868                 return;
 8869         }
 8870         last_mbuf = NULL;
 8871         chunk_length = 0;
 8872         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
 8873                 chunk_length += SCTP_BUF_LEN(mat);
 8874                 if (SCTP_BUF_NEXT(mat) == NULL) {
 8875                         last_mbuf = mat;
 8876                 }
 8877         }
 8878         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
 8879                 sctp_m_freem(op_err);
 8880                 return;
 8881         }
 8882         padding_length = chunk_length % 4;
 8883         if (padding_length != 0) {
 8884                 padding_length = 4 - padding_length;
 8885         }
 8886         if (padding_length != 0) {
 8887                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
 8888                         sctp_m_freem(op_err);
 8889                         return;
 8890                 }
 8891         }
 8892         sctp_alloc_a_chunk(stcb, chk);
 8893         if (chk == NULL) {
 8894                 /* no memory */
 8895                 sctp_m_freem(op_err);
 8896                 return;
 8897         }
 8898         chk->copy_by_ref = 0;
 8899         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
 8900         chk->rec.chunk_id.can_take_data = 0;
 8901         chk->flags = 0;
 8902         chk->send_size = (uint16_t)chunk_length;
 8903         chk->sent = SCTP_DATAGRAM_UNSENT;
 8904         chk->snd_count = 0;
 8905         chk->asoc = &stcb->asoc;
 8906         chk->data = op_err;
 8907         chk->whoTo = NULL;
 8908         hdr = mtod(op_err, struct sctp_chunkhdr *);
 8909         hdr->chunk_type = SCTP_OPERATION_ERROR;
 8910         hdr->chunk_flags = 0;
 8911         hdr->chunk_length = htons(chk->send_size);
 8912         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8913         chk->asoc->ctrl_queue_cnt++;
 8914 }
 8915 
 8916 int
 8917 sctp_send_cookie_echo(struct mbuf *m,
 8918     int offset, int limit,
 8919     struct sctp_tcb *stcb,
 8920     struct sctp_nets *net)
 8921 {
 8922         /*-
 8923          * pull out the cookie and put it at the front of the control chunk
 8924          * queue.
 8925          */
 8926         int at;
 8927         struct mbuf *cookie;
 8928         struct sctp_paramhdr param, *phdr;
 8929         struct sctp_chunkhdr *hdr;
 8930         struct sctp_tmit_chunk *chk;
 8931         uint16_t ptype, plen;
 8932 
 8933         SCTP_TCB_LOCK_ASSERT(stcb);
 8934         /* First find the cookie in the param area */
 8935         cookie = NULL;
 8936         at = offset + sizeof(struct sctp_init_chunk);
 8937         for (;;) {
 8938                 phdr = sctp_get_next_param(m, at, &param, sizeof(param));
 8939                 if (phdr == NULL) {
 8940                         return (-3);
 8941                 }
 8942                 ptype = ntohs(phdr->param_type);
 8943                 plen = ntohs(phdr->param_length);
 8944                 if (plen < sizeof(struct sctp_paramhdr)) {
 8945                         return (-6);
 8946                 }
 8947                 if (ptype == SCTP_STATE_COOKIE) {
 8948                         int pad;
 8949 
 8950                         /* found the cookie */
 8951                         if (at + plen > limit) {
 8952                                 return (-7);
 8953                         }
 8954                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
 8955                         if (cookie == NULL) {
 8956                                 /* No memory */
 8957                                 return (-2);
 8958                         }
 8959                         if ((pad = (plen % 4)) > 0) {
 8960                                 pad = 4 - pad;
 8961                         }
 8962                         if (pad > 0) {
 8963                                 if (sctp_pad_lastmbuf(cookie, pad, NULL) == NULL) {
 8964                                         return (-8);
 8965                                 }
 8966                         }
 8967 #ifdef SCTP_MBUF_LOGGING
 8968                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 8969                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
 8970                         }
 8971 #endif
 8972                         break;
 8973                 }
 8974                 at += SCTP_SIZE32(plen);
 8975         }
 8976         /* ok, we got the cookie lets change it into a cookie echo chunk */
 8977         /* first the change from param to cookie */
 8978         hdr = mtod(cookie, struct sctp_chunkhdr *);
 8979         hdr->chunk_type = SCTP_COOKIE_ECHO;
 8980         hdr->chunk_flags = 0;
 8981         /* get the chunk stuff now and place it in the FRONT of the queue */
 8982         sctp_alloc_a_chunk(stcb, chk);
 8983         if (chk == NULL) {
 8984                 /* no memory */
 8985                 sctp_m_freem(cookie);
 8986                 return (-5);
 8987         }
 8988         chk->copy_by_ref = 0;
 8989         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
 8990         chk->rec.chunk_id.can_take_data = 0;
 8991         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 8992         chk->send_size = SCTP_SIZE32(plen);
 8993         chk->sent = SCTP_DATAGRAM_UNSENT;
 8994         chk->snd_count = 0;
 8995         chk->asoc = &stcb->asoc;
 8996         chk->data = cookie;
 8997         chk->whoTo = net;
 8998         atomic_add_int(&chk->whoTo->ref_count, 1);
 8999         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
 9000         chk->asoc->ctrl_queue_cnt++;
 9001         return (0);
 9002 }
 9003 
 9004 void
 9005 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
 9006     struct mbuf *m,
 9007     int offset,
 9008     int chk_length,
 9009     struct sctp_nets *net)
 9010 {
 9011         /*
 9012          * take a HB request and make it into a HB ack and send it.
 9013          */
 9014         struct mbuf *outchain;
 9015         struct sctp_chunkhdr *chdr;
 9016         struct sctp_tmit_chunk *chk;
 9017 
 9018         if (net == NULL)
 9019                 /* must have a net pointer */
 9020                 return;
 9021 
 9022         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
 9023         if (outchain == NULL) {
 9024                 /* gak out of memory */
 9025                 return;
 9026         }
 9027 #ifdef SCTP_MBUF_LOGGING
 9028         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9029                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
 9030         }
 9031 #endif
 9032         chdr = mtod(outchain, struct sctp_chunkhdr *);
 9033         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
 9034         chdr->chunk_flags = 0;
 9035         if (chk_length % 4 != 0) {
 9036                 sctp_pad_lastmbuf(outchain, 4 - (chk_length % 4), NULL);
 9037         }
 9038         sctp_alloc_a_chunk(stcb, chk);
 9039         if (chk == NULL) {
 9040                 /* no memory */
 9041                 sctp_m_freem(outchain);
 9042                 return;
 9043         }
 9044         chk->copy_by_ref = 0;
 9045         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
 9046         chk->rec.chunk_id.can_take_data = 1;
 9047         chk->flags = 0;
 9048         chk->send_size = chk_length;
 9049         chk->sent = SCTP_DATAGRAM_UNSENT;
 9050         chk->snd_count = 0;
 9051         chk->asoc = &stcb->asoc;
 9052         chk->data = outchain;
 9053         chk->whoTo = net;
 9054         atomic_add_int(&chk->whoTo->ref_count, 1);
 9055         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9056         chk->asoc->ctrl_queue_cnt++;
 9057 }
 9058 
 9059 void
 9060 sctp_send_cookie_ack(struct sctp_tcb *stcb)
 9061 {
 9062         /* formulate and queue a cookie-ack back to sender */
 9063         struct mbuf *cookie_ack;
 9064         struct sctp_chunkhdr *hdr;
 9065         struct sctp_tmit_chunk *chk;
 9066 
 9067         SCTP_TCB_LOCK_ASSERT(stcb);
 9068 
 9069         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
 9070         if (cookie_ack == NULL) {
 9071                 /* no mbuf's */
 9072                 return;
 9073         }
 9074         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
 9075         sctp_alloc_a_chunk(stcb, chk);
 9076         if (chk == NULL) {
 9077                 /* no memory */
 9078                 sctp_m_freem(cookie_ack);
 9079                 return;
 9080         }
 9081         chk->copy_by_ref = 0;
 9082         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
 9083         chk->rec.chunk_id.can_take_data = 1;
 9084         chk->flags = 0;
 9085         chk->send_size = sizeof(struct sctp_chunkhdr);
 9086         chk->sent = SCTP_DATAGRAM_UNSENT;
 9087         chk->snd_count = 0;
 9088         chk->asoc = &stcb->asoc;
 9089         chk->data = cookie_ack;
 9090         if (chk->asoc->last_control_chunk_from != NULL) {
 9091                 chk->whoTo = chk->asoc->last_control_chunk_from;
 9092                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9093         } else {
 9094                 chk->whoTo = NULL;
 9095         }
 9096         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
 9097         hdr->chunk_type = SCTP_COOKIE_ACK;
 9098         hdr->chunk_flags = 0;
 9099         hdr->chunk_length = htons(chk->send_size);
 9100         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
 9101         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9102         chk->asoc->ctrl_queue_cnt++;
 9103         return;
 9104 }
 9105 
 9106 void
 9107 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
 9108 {
 9109         /* formulate and queue a SHUTDOWN-ACK back to the sender */
 9110         struct mbuf *m_shutdown_ack;
 9111         struct sctp_shutdown_ack_chunk *ack_cp;
 9112         struct sctp_tmit_chunk *chk;
 9113 
 9114         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9115         if (m_shutdown_ack == NULL) {
 9116                 /* no mbuf's */
 9117                 return;
 9118         }
 9119         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
 9120         sctp_alloc_a_chunk(stcb, chk);
 9121         if (chk == NULL) {
 9122                 /* no memory */
 9123                 sctp_m_freem(m_shutdown_ack);
 9124                 return;
 9125         }
 9126         chk->copy_by_ref = 0;
 9127         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
 9128         chk->rec.chunk_id.can_take_data = 1;
 9129         chk->flags = 0;
 9130         chk->send_size = sizeof(struct sctp_chunkhdr);
 9131         chk->sent = SCTP_DATAGRAM_UNSENT;
 9132         chk->snd_count = 0;
 9133         chk->asoc = &stcb->asoc;
 9134         chk->data = m_shutdown_ack;
 9135         chk->whoTo = net;
 9136         if (chk->whoTo) {
 9137                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9138         }
 9139         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
 9140         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
 9141         ack_cp->ch.chunk_flags = 0;
 9142         ack_cp->ch.chunk_length = htons(chk->send_size);
 9143         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
 9144         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9145         chk->asoc->ctrl_queue_cnt++;
 9146         return;
 9147 }
 9148 
 9149 void
 9150 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
 9151 {
 9152         /* formulate and queue a SHUTDOWN to the sender */
 9153         struct mbuf *m_shutdown;
 9154         struct sctp_shutdown_chunk *shutdown_cp;
 9155         struct sctp_tmit_chunk *chk;
 9156 
 9157         TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
 9158                 if (chk->rec.chunk_id.id == SCTP_SHUTDOWN) {
 9159                         /* We already have a SHUTDOWN queued. Reuse it. */
 9160                         if (chk->whoTo) {
 9161                                 sctp_free_remote_addr(chk->whoTo);
 9162                                 chk->whoTo = NULL;
 9163                         }
 9164                         break;
 9165                 }
 9166         }
 9167         if (chk == NULL) {
 9168                 m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9169                 if (m_shutdown == NULL) {
 9170                         /* no mbuf's */
 9171                         return;
 9172                 }
 9173                 SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
 9174                 sctp_alloc_a_chunk(stcb, chk);
 9175                 if (chk == NULL) {
 9176                         /* no memory */
 9177                         sctp_m_freem(m_shutdown);
 9178                         return;
 9179                 }
 9180                 chk->copy_by_ref = 0;
 9181                 chk->rec.chunk_id.id = SCTP_SHUTDOWN;
 9182                 chk->rec.chunk_id.can_take_data = 1;
 9183                 chk->flags = 0;
 9184                 chk->send_size = sizeof(struct sctp_shutdown_chunk);
 9185                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9186                 chk->snd_count = 0;
 9187                 chk->asoc = &stcb->asoc;
 9188                 chk->data = m_shutdown;
 9189                 chk->whoTo = net;
 9190                 if (chk->whoTo) {
 9191                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9192                 }
 9193                 shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
 9194                 shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
 9195                 shutdown_cp->ch.chunk_flags = 0;
 9196                 shutdown_cp->ch.chunk_length = htons(chk->send_size);
 9197                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9198                 SCTP_BUF_LEN(m_shutdown) = chk->send_size;
 9199                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9200                 chk->asoc->ctrl_queue_cnt++;
 9201         } else {
 9202                 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, sctp_next);
 9203                 chk->whoTo = net;
 9204                 if (chk->whoTo) {
 9205                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9206                 }
 9207                 shutdown_cp = mtod(chk->data, struct sctp_shutdown_chunk *);
 9208                 shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9209                 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
 9210         }
 9211         return;
 9212 }
 9213 
 9214 void
 9215 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
 9216 {
 9217         /*
 9218          * formulate and queue an ASCONF to the peer. ASCONF parameters
 9219          * should be queued on the assoc queue.
 9220          */
 9221         struct sctp_tmit_chunk *chk;
 9222         struct mbuf *m_asconf;
 9223         int len;
 9224 
 9225         SCTP_TCB_LOCK_ASSERT(stcb);
 9226 
 9227         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
 9228             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
 9229                 /* can't send a new one if there is one in flight already */
 9230                 return;
 9231         }
 9232 
 9233         /* compose an ASCONF chunk, maximum length is PMTU */
 9234         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
 9235         if (m_asconf == NULL) {
 9236                 return;
 9237         }
 9238 
 9239         sctp_alloc_a_chunk(stcb, chk);
 9240         if (chk == NULL) {
 9241                 /* no memory */
 9242                 sctp_m_freem(m_asconf);
 9243                 return;
 9244         }
 9245 
 9246         chk->copy_by_ref = 0;
 9247         chk->rec.chunk_id.id = SCTP_ASCONF;
 9248         chk->rec.chunk_id.can_take_data = 0;
 9249         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9250         chk->data = m_asconf;
 9251         chk->send_size = len;
 9252         chk->sent = SCTP_DATAGRAM_UNSENT;
 9253         chk->snd_count = 0;
 9254         chk->asoc = &stcb->asoc;
 9255         chk->whoTo = net;
 9256         if (chk->whoTo) {
 9257                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9258         }
 9259         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
 9260         chk->asoc->ctrl_queue_cnt++;
 9261         return;
 9262 }
 9263 
 9264 void
 9265 sctp_send_asconf_ack(struct sctp_tcb *stcb)
 9266 {
 9267         /*
 9268          * formulate and queue a asconf-ack back to sender. the asconf-ack
 9269          * must be stored in the tcb.
 9270          */
 9271         struct sctp_tmit_chunk *chk;
 9272         struct sctp_asconf_ack *ack, *latest_ack;
 9273         struct mbuf *m_ack;
 9274         struct sctp_nets *net = NULL;
 9275 
 9276         SCTP_TCB_LOCK_ASSERT(stcb);
 9277         /* Get the latest ASCONF-ACK */
 9278         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
 9279         if (latest_ack == NULL) {
 9280                 return;
 9281         }
 9282         if (latest_ack->last_sent_to != NULL &&
 9283             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
 9284                 /* we're doing a retransmission */
 9285                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
 9286                 if (net == NULL) {
 9287                         /* no alternate */
 9288                         if (stcb->asoc.last_control_chunk_from == NULL) {
 9289                                 if (stcb->asoc.alternate) {
 9290                                         net = stcb->asoc.alternate;
 9291                                 } else {
 9292                                         net = stcb->asoc.primary_destination;
 9293                                 }
 9294                         } else {
 9295                                 net = stcb->asoc.last_control_chunk_from;
 9296                         }
 9297                 }
 9298         } else {
 9299                 /* normal case */
 9300                 if (stcb->asoc.last_control_chunk_from == NULL) {
 9301                         if (stcb->asoc.alternate) {
 9302                                 net = stcb->asoc.alternate;
 9303                         } else {
 9304                                 net = stcb->asoc.primary_destination;
 9305                         }
 9306                 } else {
 9307                         net = stcb->asoc.last_control_chunk_from;
 9308                 }
 9309         }
 9310         latest_ack->last_sent_to = net;
 9311 
 9312         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
 9313                 if (ack->data == NULL) {
 9314                         continue;
 9315                 }
 9316 
 9317                 /* copy the asconf_ack */
 9318                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
 9319                 if (m_ack == NULL) {
 9320                         /* couldn't copy it */
 9321                         return;
 9322                 }
 9323 #ifdef SCTP_MBUF_LOGGING
 9324                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9325                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
 9326                 }
 9327 #endif
 9328 
 9329                 sctp_alloc_a_chunk(stcb, chk);
 9330                 if (chk == NULL) {
 9331                         /* no memory */
 9332                         if (m_ack)
 9333                                 sctp_m_freem(m_ack);
 9334                         return;
 9335                 }
 9336                 chk->copy_by_ref = 0;
 9337                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
 9338                 chk->rec.chunk_id.can_take_data = 1;
 9339                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9340                 chk->whoTo = net;
 9341                 if (chk->whoTo) {
 9342                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9343                 }
 9344                 chk->data = m_ack;
 9345                 chk->send_size = ack->len;
 9346                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9347                 chk->snd_count = 0;
 9348                 chk->asoc = &stcb->asoc;
 9349 
 9350                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9351                 chk->asoc->ctrl_queue_cnt++;
 9352         }
 9353         return;
 9354 }
 9355 
 9356 static int
 9357 sctp_chunk_retransmission(struct sctp_inpcb *inp,
 9358     struct sctp_tcb *stcb,
 9359     struct sctp_association *asoc,
 9360     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked)
 9361 {
 9362         /*-
 9363          * send out one MTU of retransmission. If fast_retransmit is
 9364          * happening we ignore the cwnd. Otherwise we obey the cwnd and
 9365          * rwnd. For a Cookie or Asconf in the control chunk queue we
 9366          * retransmit them by themselves.
 9367          *
 9368          * For data chunks we will pick out the lowest TSN's in the sent_queue
 9369          * marked for resend and bundle them all together (up to a MTU of
 9370          * destination). The address to send to should have been
 9371          * selected/changed where the retransmission was marked (i.e. in FR
 9372          * or t3-timeout routines).
 9373          */
 9374         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 9375         struct sctp_tmit_chunk *chk, *fwd;
 9376         struct mbuf *m, *endofchain;
 9377         struct sctp_nets *net = NULL;
 9378         uint32_t tsns_sent = 0;
 9379         int no_fragmentflg, bundle_at;
 9380         unsigned int mtu;
 9381         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
 9382         struct sctp_auth_chunk *auth = NULL;
 9383         uint32_t auth_offset = 0;
 9384         uint16_t auth_keyid;
 9385         int override_ok = 1;
 9386         int data_auth_reqd = 0;
 9387         uint32_t dmtu = 0;
 9388 
 9389         SCTP_TCB_LOCK_ASSERT(stcb);
 9390         tmr_started = ctl_cnt = 0;
 9391         no_fragmentflg = 1;
 9392         fwd_tsn = 0;
 9393         *cnt_out = 0;
 9394         fwd = NULL;
 9395         endofchain = m = NULL;
 9396         auth_keyid = stcb->asoc.authinfo.active_keyid;
 9397 #ifdef SCTP_AUDITING_ENABLED
 9398         sctp_audit_log(0xC3, 1);
 9399 #endif
 9400         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
 9401             (TAILQ_EMPTY(&asoc->control_send_queue))) {
 9402                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
 9403                     asoc->sent_queue_retran_cnt);
 9404                 asoc->sent_queue_cnt = 0;
 9405                 asoc->sent_queue_cnt_removeable = 0;
 9406                 /* send back 0/0 so we enter normal transmission */
 9407                 *cnt_out = 0;
 9408                 return (0);
 9409         }
 9410         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9411                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
 9412                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
 9413                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
 9414                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9415                                 continue;
 9416                         }
 9417                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 9418                                 if (chk != asoc->str_reset) {
 9419                                         /*
 9420                                          * not eligible for retran if its
 9421                                          * not ours
 9422                                          */
 9423                                         continue;
 9424                                 }
 9425                         }
 9426                         ctl_cnt++;
 9427                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 9428                                 fwd_tsn = 1;
 9429                         }
 9430                         /*
 9431                          * Add an AUTH chunk, if chunk requires it save the
 9432                          * offset into the chain for AUTH
 9433                          */
 9434                         if ((auth == NULL) &&
 9435                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9436                             stcb->asoc.peer_auth_chunks))) {
 9437                                 m = sctp_add_auth_chunk(m, &endofchain,
 9438                                     &auth, &auth_offset,
 9439                                     stcb,
 9440                                     chk->rec.chunk_id.id);
 9441                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9442                         }
 9443                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9444                         break;
 9445                 }
 9446         }
 9447         one_chunk = 0;
 9448         /* do we have control chunks to retransmit? */
 9449         if (m != NULL) {
 9450                 /* Start a timer no matter if we succeed or fail */
 9451                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 9452                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
 9453                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
 9454                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
 9455                 chk->snd_count++;       /* update our count */
 9456                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
 9457                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
 9458                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9459                     no_fragmentflg, 0, 0,
 9460                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9461                     chk->whoTo->port, NULL,
 9462                     0, 0,
 9463                     so_locked))) {
 9464                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9465                         if (error == ENOBUFS) {
 9466                                 asoc->ifp_had_enobuf = 1;
 9467                                 SCTP_STAT_INCR(sctps_lowlevelerr);
 9468                         }
 9469                         return (error);
 9470                 } else {
 9471                         asoc->ifp_had_enobuf = 0;
 9472                 }
 9473                 endofchain = NULL;
 9474                 auth = NULL;
 9475                 auth_offset = 0;
 9476                 /*
 9477                  * We don't want to mark the net->sent time here since this
 9478                  * we use this for HB and retrans cannot measure RTT
 9479                  */
 9480                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
 9481                 *cnt_out += 1;
 9482                 chk->sent = SCTP_DATAGRAM_SENT;
 9483                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
 9484                 if (fwd_tsn == 0) {
 9485                         return (0);
 9486                 } else {
 9487                         /* Clean up the fwd-tsn list */
 9488                         sctp_clean_up_ctl(stcb, asoc, so_locked);
 9489                         return (0);
 9490                 }
 9491         }
 9492         /*
 9493          * Ok, it is just data retransmission we need to do or that and a
 9494          * fwd-tsn with it all.
 9495          */
 9496         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 9497                 return (SCTP_RETRAN_DONE);
 9498         }
 9499         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) ||
 9500             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT)) {
 9501                 /* not yet open, resend the cookie and that is it */
 9502                 return (1);
 9503         }
 9504 #ifdef SCTP_AUDITING_ENABLED
 9505         sctp_auditing(20, inp, stcb, NULL);
 9506 #endif
 9507         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
 9508         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 9509                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9510                         /* No, not sent to this net or not ready for rtx */
 9511                         continue;
 9512                 }
 9513                 if (chk->data == NULL) {
 9514                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
 9515                             chk->rec.data.tsn, chk->snd_count, chk->sent);
 9516                         continue;
 9517                 }
 9518                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
 9519                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
 9520                         struct mbuf *op_err;
 9521                         char msg[SCTP_DIAG_INFO_LEN];
 9522 
 9523                         SCTP_SNPRINTF(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
 9524                             chk->rec.data.tsn, chk->snd_count);
 9525                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 9526                             msg);
 9527                         atomic_add_int(&stcb->asoc.refcnt, 1);
 9528                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
 9529                             false, so_locked);
 9530                         SCTP_TCB_LOCK(stcb);
 9531                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 9532                         return (SCTP_RETRAN_EXIT);
 9533                 }
 9534                 /* pick up the net */
 9535                 net = chk->whoTo;
 9536                 switch (net->ro._l_addr.sa.sa_family) {
 9537 #ifdef INET
 9538                 case AF_INET:
 9539                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 9540                         break;
 9541 #endif
 9542 #ifdef INET6
 9543                 case AF_INET6:
 9544                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9545                         break;
 9546 #endif
 9547                 default:
 9548                         /* TSNH */
 9549                         mtu = net->mtu;
 9550                         break;
 9551                 }
 9552 
 9553                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
 9554                         /* No room in peers rwnd */
 9555                         uint32_t tsn;
 9556 
 9557                         tsn = asoc->last_acked_seq + 1;
 9558                         if (tsn == chk->rec.data.tsn) {
 9559                                 /*
 9560                                  * we make a special exception for this
 9561                                  * case. The peer has no rwnd but is missing
 9562                                  * the lowest chunk.. which is probably what
 9563                                  * is holding up the rwnd.
 9564                                  */
 9565                                 goto one_chunk_around;
 9566                         }
 9567                         return (1);
 9568                 }
 9569 one_chunk_around:
 9570                 if (asoc->peers_rwnd < mtu) {
 9571                         one_chunk = 1;
 9572                         if ((asoc->peers_rwnd == 0) &&
 9573                             (asoc->total_flight == 0)) {
 9574                                 chk->window_probe = 1;
 9575                                 chk->whoTo->window_probe = 1;
 9576                         }
 9577                 }
 9578 #ifdef SCTP_AUDITING_ENABLED
 9579                 sctp_audit_log(0xC3, 2);
 9580 #endif
 9581                 bundle_at = 0;
 9582                 m = NULL;
 9583                 net->fast_retran_ip = 0;
 9584                 if (chk->rec.data.doing_fast_retransmit == 0) {
 9585                         /*
 9586                          * if no FR in progress skip destination that have
 9587                          * flight_size > cwnd.
 9588                          */
 9589                         if (net->flight_size >= net->cwnd) {
 9590                                 continue;
 9591                         }
 9592                 } else {
 9593                         /*
 9594                          * Mark the destination net to have FR recovery
 9595                          * limits put on it.
 9596                          */
 9597                         *fr_done = 1;
 9598                         net->fast_retran_ip = 1;
 9599                 }
 9600 
 9601                 /*
 9602                  * if no AUTH is yet included and this chunk requires it,
 9603                  * make sure to account for it.  We don't apply the size
 9604                  * until the AUTH chunk is actually added below in case
 9605                  * there is no room for this chunk.
 9606                  */
 9607                 if (data_auth_reqd && (auth == NULL)) {
 9608                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9609                 } else
 9610                         dmtu = 0;
 9611 
 9612                 if ((chk->send_size <= (mtu - dmtu)) ||
 9613                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9614                         /* ok we will add this one */
 9615                         if (data_auth_reqd) {
 9616                                 if (auth == NULL) {
 9617                                         m = sctp_add_auth_chunk(m,
 9618                                             &endofchain,
 9619                                             &auth,
 9620                                             &auth_offset,
 9621                                             stcb,
 9622                                             SCTP_DATA);
 9623                                         auth_keyid = chk->auth_keyid;
 9624                                         override_ok = 0;
 9625                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9626                                 } else if (override_ok) {
 9627                                         auth_keyid = chk->auth_keyid;
 9628                                         override_ok = 0;
 9629                                 } else if (chk->auth_keyid != auth_keyid) {
 9630                                         /* different keyid, so done bundling */
 9631                                         break;
 9632                                 }
 9633                         }
 9634                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9635                         if (m == NULL) {
 9636                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9637                                 return (ENOMEM);
 9638                         }
 9639                         /* Do clear IP_DF ? */
 9640                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9641                                 no_fragmentflg = 0;
 9642                         }
 9643                         /* update our MTU size */
 9644                         if (mtu > (chk->send_size + dmtu))
 9645                                 mtu -= (chk->send_size + dmtu);
 9646                         else
 9647                                 mtu = 0;
 9648                         data_list[bundle_at++] = chk;
 9649                         if (one_chunk && (asoc->total_flight <= 0)) {
 9650                                 SCTP_STAT_INCR(sctps_windowprobed);
 9651                         }
 9652                 }
 9653                 if (one_chunk == 0) {
 9654                         /*
 9655                          * now are there anymore forward from chk to pick
 9656                          * up?
 9657                          */
 9658                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
 9659                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
 9660                                         /* Nope, not for retran */
 9661                                         continue;
 9662                                 }
 9663                                 if (fwd->whoTo != net) {
 9664                                         /* Nope, not the net in question */
 9665                                         continue;
 9666                                 }
 9667                                 if (data_auth_reqd && (auth == NULL)) {
 9668                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9669                                 } else
 9670                                         dmtu = 0;
 9671                                 if (fwd->send_size <= (mtu - dmtu)) {
 9672                                         if (data_auth_reqd) {
 9673                                                 if (auth == NULL) {
 9674                                                         m = sctp_add_auth_chunk(m,
 9675                                                             &endofchain,
 9676                                                             &auth,
 9677                                                             &auth_offset,
 9678                                                             stcb,
 9679                                                             SCTP_DATA);
 9680                                                         auth_keyid = fwd->auth_keyid;
 9681                                                         override_ok = 0;
 9682                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9683                                                 } else if (override_ok) {
 9684                                                         auth_keyid = fwd->auth_keyid;
 9685                                                         override_ok = 0;
 9686                                                 } else if (fwd->auth_keyid != auth_keyid) {
 9687                                                         /*
 9688                                                          * different keyid,
 9689                                                          * so done bundling
 9690                                                          */
 9691                                                         break;
 9692                                                 }
 9693                                         }
 9694                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
 9695                                         if (m == NULL) {
 9696                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9697                                                 return (ENOMEM);
 9698                                         }
 9699                                         /* Do clear IP_DF ? */
 9700                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9701                                                 no_fragmentflg = 0;
 9702                                         }
 9703                                         /* update our MTU size */
 9704                                         if (mtu > (fwd->send_size + dmtu))
 9705                                                 mtu -= (fwd->send_size + dmtu);
 9706                                         else
 9707                                                 mtu = 0;
 9708                                         data_list[bundle_at++] = fwd;
 9709                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 9710                                                 break;
 9711                                         }
 9712                                 } else {
 9713                                         /* can't fit so we are done */
 9714                                         break;
 9715                                 }
 9716                         }
 9717                 }
 9718                 /* Is there something to send for this destination? */
 9719                 if (m) {
 9720                         /*
 9721                          * No matter if we fail/or succeed we should start a
 9722                          * timer. A failure is like a lost IP packet :-)
 9723                          */
 9724                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9725                                 /*
 9726                                  * no timer running on this destination
 9727                                  * restart it.
 9728                                  */
 9729                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9730                                 tmr_started = 1;
 9731                         }
 9732                         /* Now lets send it, if there is anything to send :> */
 9733                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9734                             (struct sockaddr *)&net->ro._l_addr, m,
 9735                             auth_offset, auth, auth_keyid,
 9736                             no_fragmentflg, 0, 0,
 9737                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9738                             net->port, NULL,
 9739                             0, 0,
 9740                             so_locked))) {
 9741                                 /* error, we could not output */
 9742                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 9743                                 if (error == ENOBUFS) {
 9744                                         asoc->ifp_had_enobuf = 1;
 9745                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9746                                 }
 9747                                 return (error);
 9748                         } else {
 9749                                 asoc->ifp_had_enobuf = 0;
 9750                         }
 9751                         endofchain = NULL;
 9752                         auth = NULL;
 9753                         auth_offset = 0;
 9754                         /* For HB's */
 9755                         /*
 9756                          * We don't want to mark the net->sent time here
 9757                          * since this we use this for HB and retrans cannot
 9758                          * measure RTT
 9759                          */
 9760                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
 9761 
 9762                         /* For auto-close */
 9763                         if (*now_filled == 0) {
 9764                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 9765                                 *now = asoc->time_last_sent;
 9766                                 *now_filled = 1;
 9767                         } else {
 9768                                 asoc->time_last_sent = *now;
 9769                         }
 9770                         *cnt_out += bundle_at;
 9771 #ifdef SCTP_AUDITING_ENABLED
 9772                         sctp_audit_log(0xC4, bundle_at);
 9773 #endif
 9774                         if (bundle_at) {
 9775                                 tsns_sent = data_list[0]->rec.data.tsn;
 9776                         }
 9777                         for (i = 0; i < bundle_at; i++) {
 9778                                 SCTP_STAT_INCR(sctps_sendretransdata);
 9779                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 9780                                 /*
 9781                                  * When we have a revoked data, and we
 9782                                  * retransmit it, then we clear the revoked
 9783                                  * flag since this flag dictates if we
 9784                                  * subtracted from the fs
 9785                                  */
 9786                                 if (data_list[i]->rec.data.chunk_was_revoked) {
 9787                                         /* Deflate the cwnd */
 9788                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
 9789                                         data_list[i]->rec.data.chunk_was_revoked = 0;
 9790                                 }
 9791                                 data_list[i]->snd_count++;
 9792                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 9793                                 /* record the time */
 9794                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
 9795                                 if (data_list[i]->book_size_scale) {
 9796                                         /*
 9797                                          * need to double the book size on
 9798                                          * this one
 9799                                          */
 9800                                         data_list[i]->book_size_scale = 0;
 9801                                         /*
 9802                                          * Since we double the booksize, we
 9803                                          * must also double the output queue
 9804                                          * size, since this get shrunk when
 9805                                          * we free by this amount.
 9806                                          */
 9807                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
 9808                                         data_list[i]->book_size *= 2;
 9809                                 } else {
 9810                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 9811                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 9812                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 9813                                         }
 9814                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 9815                                             (uint32_t)(data_list[i]->send_size +
 9816                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 9817                                 }
 9818                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 9819                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
 9820                                             data_list[i]->whoTo->flight_size,
 9821                                             data_list[i]->book_size,
 9822                                             (uint32_t)(uintptr_t)data_list[i]->whoTo,
 9823                                             data_list[i]->rec.data.tsn);
 9824                                 }
 9825                                 sctp_flight_size_increase(data_list[i]);
 9826                                 sctp_total_flight_increase(stcb, data_list[i]);
 9827                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 9828                                         /* SWS sender side engages */
 9829                                         asoc->peers_rwnd = 0;
 9830                                 }
 9831                                 if ((i == 0) &&
 9832                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
 9833                                         SCTP_STAT_INCR(sctps_sendfastretrans);
 9834                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
 9835                                             (tmr_started == 0)) {
 9836                                                 /*-
 9837                                                  * ok we just fast-retrans'd
 9838                                                  * the lowest TSN, i.e the
 9839                                                  * first on the list. In
 9840                                                  * this case we want to give
 9841                                                  * some more time to get a
 9842                                                  * SACK back without a
 9843                                                  * t3-expiring.
 9844                                                  */
 9845                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
 9846                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
 9847                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9848                                         }
 9849                                 }
 9850                         }
 9851                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 9852                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
 9853                         }
 9854 #ifdef SCTP_AUDITING_ENABLED
 9855                         sctp_auditing(21, inp, stcb, NULL);
 9856 #endif
 9857                 } else {
 9858                         /* None will fit */
 9859                         return (1);
 9860                 }
 9861                 if (asoc->sent_queue_retran_cnt <= 0) {
 9862                         /* all done we have no more to retran */
 9863                         asoc->sent_queue_retran_cnt = 0;
 9864                         break;
 9865                 }
 9866                 if (one_chunk) {
 9867                         /* No more room in rwnd */
 9868                         return (1);
 9869                 }
 9870                 /* stop the for loop here. we sent out a packet */
 9871                 break;
 9872         }
 9873         return (0);
 9874 }
 9875 
 9876 static void
 9877 sctp_timer_validation(struct sctp_inpcb *inp,
 9878     struct sctp_tcb *stcb,
 9879     struct sctp_association *asoc)
 9880 {
 9881         struct sctp_nets *net;
 9882 
 9883         /* Validate that a timer is running somewhere */
 9884         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 9885                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9886                         /* Here is a timer */
 9887                         return;
 9888                 }
 9889         }
 9890         SCTP_TCB_LOCK_ASSERT(stcb);
 9891         /* Gak, we did not have a timer somewhere */
 9892         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
 9893         if (asoc->alternate) {
 9894                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
 9895         } else {
 9896                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 9897         }
 9898         return;
 9899 }
 9900 
 9901 void
 9902 sctp_chunk_output(struct sctp_inpcb *inp,
 9903     struct sctp_tcb *stcb,
 9904     int from_where,
 9905     int so_locked)
 9906 {
 9907         /*-
 9908          * Ok this is the generic chunk service queue. we must do the
 9909          * following:
 9910          * - See if there are retransmits pending, if so we must
 9911          *   do these first.
 9912          * - Service the stream queue that is next, moving any
 9913          *   message (note I must get a complete message i.e.
 9914          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
 9915          *   TSN's
 9916          * - Check to see if the cwnd/rwnd allows any output, if so we
 9917          *   go ahead and formulate and send the low level chunks. Making sure
 9918          *   to combine any control in the control chunk queue also.
 9919          */
 9920         struct sctp_association *asoc;
 9921         struct sctp_nets *net;
 9922         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
 9923         unsigned int burst_cnt = 0;
 9924         struct timeval now;
 9925         int now_filled = 0;
 9926         int nagle_on;
 9927         uint32_t frag_point = sctp_get_frag_point(stcb);
 9928         int un_sent = 0;
 9929         int fr_done;
 9930         unsigned int tot_frs = 0;
 9931 
 9932         asoc = &stcb->asoc;
 9933 do_it_again:
 9934         /* The Nagle algorithm is only applied when handling a send call. */
 9935         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
 9936                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
 9937                         nagle_on = 0;
 9938                 } else {
 9939                         nagle_on = 1;
 9940                 }
 9941         } else {
 9942                 nagle_on = 0;
 9943         }
 9944         SCTP_TCB_LOCK_ASSERT(stcb);
 9945 
 9946         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 9947 
 9948         if ((un_sent <= 0) &&
 9949             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
 9950             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
 9951             (asoc->sent_queue_retran_cnt == 0) &&
 9952             (asoc->trigger_reset == 0)) {
 9953                 /* Nothing to do unless there is something to be sent left */
 9954                 return;
 9955         }
 9956         /*
 9957          * Do we have something to send, data or control AND a sack timer
 9958          * running, if so piggy-back the sack.
 9959          */
 9960         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 9961                 sctp_send_sack(stcb, so_locked);
 9962                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
 9963                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
 9964         }
 9965         while (asoc->sent_queue_retran_cnt) {
 9966                 /*-
 9967                  * Ok, it is retransmission time only, we send out only ONE
 9968                  * packet with a single call off to the retran code.
 9969                  */
 9970                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
 9971                         /*-
 9972                          * Special hook for handling cookies discarded
 9973                          * by peer that carried data. Send cookie-ack only
 9974                          * and then the next call with get the retran's.
 9975                          */
 9976                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
 9977                             from_where,
 9978                             &now, &now_filled, frag_point, so_locked);
 9979                         return;
 9980                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
 9981                         /* if its not from a HB then do it */
 9982                         fr_done = 0;
 9983                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
 9984                         if (fr_done) {
 9985                                 tot_frs++;
 9986                         }
 9987                 } else {
 9988                         /*
 9989                          * its from any other place, we don't allow retran
 9990                          * output (only control)
 9991                          */
 9992                         ret = 1;
 9993                 }
 9994                 if (ret > 0) {
 9995                         /* Can't send anymore */
 9996                         /*-
 9997                          * now lets push out control by calling med-level
 9998                          * output once. this assures that we WILL send HB's
 9999                          * if queued too.
10000                          */
10001                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10002                             from_where,
10003                             &now, &now_filled, frag_point, so_locked);
10004 #ifdef SCTP_AUDITING_ENABLED
10005                         sctp_auditing(8, inp, stcb, NULL);
10006 #endif
10007                         sctp_timer_validation(inp, stcb, asoc);
10008                         return;
10009                 }
10010                 if (ret < 0) {
10011                         /*-
10012                          * The count was off.. retran is not happening so do
10013                          * the normal retransmission.
10014                          */
10015 #ifdef SCTP_AUDITING_ENABLED
10016                         sctp_auditing(9, inp, stcb, NULL);
10017 #endif
10018                         if (ret == SCTP_RETRAN_EXIT) {
10019                                 return;
10020                         }
10021                         break;
10022                 }
10023                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10024                         /* Only one transmission allowed out of a timeout */
10025 #ifdef SCTP_AUDITING_ENABLED
10026                         sctp_auditing(10, inp, stcb, NULL);
10027 #endif
10028                         /* Push out any control */
10029                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10030                             &now, &now_filled, frag_point, so_locked);
10031                         return;
10032                 }
10033                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10034                         /* Hit FR burst limit */
10035                         return;
10036                 }
10037                 if ((num_out == 0) && (ret == 0)) {
10038                         /* No more retrans to send */
10039                         break;
10040                 }
10041         }
10042 #ifdef SCTP_AUDITING_ENABLED
10043         sctp_auditing(12, inp, stcb, NULL);
10044 #endif
10045         /* Check for bad destinations, if they exist move chunks around. */
10046         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10047                 if ((net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10048                         /*-
10049                          * if possible move things off of this address we
10050                          * still may send below due to the dormant state but
10051                          * we try to find an alternate address to send to
10052                          * and if we have one we move all queued data on the
10053                          * out wheel to this alternate address.
10054                          */
10055                         if (net->ref_count > 1)
10056                                 sctp_move_chunks_from_net(stcb, net);
10057                 } else {
10058                         /*-
10059                          * if ((asoc->sat_network) || (net->addr_is_local))
10060                          * { burst_limit = asoc->max_burst *
10061                          * SCTP_SAT_NETWORK_BURST_INCR; }
10062                          */
10063                         if (asoc->max_burst > 0) {
10064                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10065                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10066                                                 /*
10067                                                  * JRS - Use the congestion
10068                                                  * control given in the
10069                                                  * congestion control module
10070                                                  */
10071                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10072                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10073                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10074                                                 }
10075                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10076                                         }
10077                                         net->fast_retran_ip = 0;
10078                                 } else {
10079                                         if (net->flight_size == 0) {
10080                                                 /*
10081                                                  * Should be decaying the
10082                                                  * cwnd here
10083                                                  */
10084                                                 ;
10085                                         }
10086                                 }
10087                         }
10088                 }
10089         }
10090         burst_cnt = 0;
10091         do {
10092                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10093                     &reason_code, 0, from_where,
10094                     &now, &now_filled, frag_point, so_locked);
10095                 if (error) {
10096                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10097                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10098                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10099                         }
10100                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10101                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10102                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10103                         }
10104                         break;
10105                 }
10106                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10107 
10108                 tot_out += num_out;
10109                 burst_cnt++;
10110                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10111                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10112                         if (num_out == 0) {
10113                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10114                         }
10115                 }
10116                 if (nagle_on) {
10117                         /*
10118                          * When the Nagle algorithm is used, look at how
10119                          * much is unsent, then if its smaller than an MTU
10120                          * and we have data in flight we stop, except if we
10121                          * are handling a fragmented user message.
10122                          */
10123                         un_sent = stcb->asoc.total_output_queue_size - stcb->asoc.total_flight;
10124                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10125                             (stcb->asoc.total_flight > 0)) {
10126 /*      &&                   sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {*/
10127                                 break;
10128                         }
10129                 }
10130                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10131                     TAILQ_EMPTY(&asoc->send_queue) &&
10132                     sctp_is_there_unsent_data(stcb, so_locked) == 0) {
10133                         /* Nothing left to send */
10134                         break;
10135                 }
10136                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10137                         /* Nothing left to send */
10138                         break;
10139                 }
10140         } while (num_out &&
10141             ((asoc->max_burst == 0) ||
10142             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10143             (burst_cnt < asoc->max_burst)));
10144 
10145         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10146                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10147                         SCTP_STAT_INCR(sctps_maxburstqueued);
10148                         asoc->burst_limit_applied = 1;
10149                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10150                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10151                         }
10152                 } else {
10153                         asoc->burst_limit_applied = 0;
10154                 }
10155         }
10156         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10157                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10158         }
10159         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10160             tot_out);
10161 
10162         /*-
10163          * Now we need to clean up the control chunk chain if a ECNE is on
10164          * it. It must be marked as UNSENT again so next call will continue
10165          * to send it until such time that we get a CWR, to remove it.
10166          */
10167         if (stcb->asoc.ecn_echo_cnt_onq)
10168                 sctp_fix_ecn_echo(asoc);
10169 
10170         if (stcb->asoc.trigger_reset) {
10171                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10172                         goto do_it_again;
10173                 }
10174         }
10175         return;
10176 }
10177 
10178 int
10179 sctp_output(
10180     struct sctp_inpcb *inp,
10181     struct mbuf *m,
10182     struct sockaddr *addr,
10183     struct mbuf *control,
10184     struct thread *p,
10185     int flags)
10186 {
10187         if (inp == NULL) {
10188                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10189                 return (EINVAL);
10190         }
10191 
10192         if (inp->sctp_socket == NULL) {
10193                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10194                 return (EINVAL);
10195         }
10196         return (sctp_sosend(inp->sctp_socket,
10197             addr,
10198             (struct uio *)NULL,
10199             m,
10200             control,
10201             flags, p
10202             ));
10203 }
10204 
10205 void
10206 send_forward_tsn(struct sctp_tcb *stcb,
10207     struct sctp_association *asoc)
10208 {
10209         struct sctp_tmit_chunk *chk, *at, *tp1, *last;
10210         struct sctp_forward_tsn_chunk *fwdtsn;
10211         struct sctp_strseq *strseq;
10212         struct sctp_strseq_mid *strseq_m;
10213         uint32_t advance_peer_ack_point;
10214         unsigned int cnt_of_space, i, ovh;
10215         unsigned int space_needed;
10216         unsigned int cnt_of_skipped = 0;
10217 
10218         SCTP_TCB_LOCK_ASSERT(stcb);
10219         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10220                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10221                         /* mark it to unsent */
10222                         chk->sent = SCTP_DATAGRAM_UNSENT;
10223                         chk->snd_count = 0;
10224                         /* Do we correct its output location? */
10225                         if (chk->whoTo) {
10226                                 sctp_free_remote_addr(chk->whoTo);
10227                                 chk->whoTo = NULL;
10228                         }
10229                         goto sctp_fill_in_rest;
10230                 }
10231         }
10232         /* Ok if we reach here we must build one */
10233         sctp_alloc_a_chunk(stcb, chk);
10234         if (chk == NULL) {
10235                 return;
10236         }
10237         asoc->fwd_tsn_cnt++;
10238         chk->copy_by_ref = 0;
10239         /*
10240          * We don't do the old thing here since this is used not for on-wire
10241          * but to tell if we are sending a fwd-tsn by the stack during
10242          * output. And if its a IFORWARD or a FORWARD it is a fwd-tsn.
10243          */
10244         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10245         chk->rec.chunk_id.can_take_data = 0;
10246         chk->flags = 0;
10247         chk->asoc = asoc;
10248         chk->whoTo = NULL;
10249         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10250         if (chk->data == NULL) {
10251                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10252                 return;
10253         }
10254         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10255         chk->sent = SCTP_DATAGRAM_UNSENT;
10256         chk->snd_count = 0;
10257         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10258         asoc->ctrl_queue_cnt++;
10259 sctp_fill_in_rest:
10260         /*-
10261          * Here we go through and fill out the part that deals with
10262          * stream/seq of the ones we skip.
10263          */
10264         SCTP_BUF_LEN(chk->data) = 0;
10265         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10266                 if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10267                     (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10268                         /* no more to look at */
10269                         break;
10270                 }
10271                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10272                         /* We don't report these */
10273                         continue;
10274                 }
10275                 cnt_of_skipped++;
10276         }
10277         if (asoc->idata_supported) {
10278                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10279                     (cnt_of_skipped * sizeof(struct sctp_strseq_mid)));
10280         } else {
10281                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10282                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10283         }
10284         cnt_of_space = (unsigned int)M_TRAILINGSPACE(chk->data);
10285 
10286         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10287                 ovh = SCTP_MIN_OVERHEAD;
10288         } else {
10289                 ovh = SCTP_MIN_V4_OVERHEAD;
10290         }
10291         if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10292                 /* trim to a mtu size */
10293                 cnt_of_space = asoc->smallest_mtu - ovh;
10294         }
10295         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10296                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10297                     0xff, 0, cnt_of_skipped,
10298                     asoc->advanced_peer_ack_point);
10299         }
10300         advance_peer_ack_point = asoc->advanced_peer_ack_point;
10301         if (cnt_of_space < space_needed) {
10302                 /*-
10303                  * ok we must trim down the chunk by lowering the
10304                  * advance peer ack point.
10305                  */
10306                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10307                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10308                             0xff, 0xff, cnt_of_space,
10309                             space_needed);
10310                 }
10311                 cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10312                 if (asoc->idata_supported) {
10313                         cnt_of_skipped /= sizeof(struct sctp_strseq_mid);
10314                 } else {
10315                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10316                 }
10317                 /*-
10318                  * Go through and find the TSN that will be the one
10319                  * we report.
10320                  */
10321                 at = TAILQ_FIRST(&asoc->sent_queue);
10322                 if (at != NULL) {
10323                         for (i = 0; i < cnt_of_skipped; i++) {
10324                                 tp1 = TAILQ_NEXT(at, sctp_next);
10325                                 if (tp1 == NULL) {
10326                                         break;
10327                                 }
10328                                 at = tp1;
10329                         }
10330                 }
10331                 if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10332                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10333                             0xff, cnt_of_skipped, at->rec.data.tsn,
10334                             asoc->advanced_peer_ack_point);
10335                 }
10336                 last = at;
10337                 /*-
10338                  * last now points to last one I can report, update
10339                  * peer ack point
10340                  */
10341                 if (last) {
10342                         advance_peer_ack_point = last->rec.data.tsn;
10343                 }
10344                 if (asoc->idata_supported) {
10345                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10346                             cnt_of_skipped * sizeof(struct sctp_strseq_mid);
10347                 } else {
10348                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10349                             cnt_of_skipped * sizeof(struct sctp_strseq);
10350                 }
10351         }
10352         chk->send_size = space_needed;
10353         /* Setup the chunk */
10354         fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10355         fwdtsn->ch.chunk_length = htons(chk->send_size);
10356         fwdtsn->ch.chunk_flags = 0;
10357         if (asoc->idata_supported) {
10358                 fwdtsn->ch.chunk_type = SCTP_IFORWARD_CUM_TSN;
10359         } else {
10360                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10361         }
10362         fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10363         SCTP_BUF_LEN(chk->data) = chk->send_size;
10364         fwdtsn++;
10365         /*-
10366          * Move pointer to after the fwdtsn and transfer to the
10367          * strseq pointer.
10368          */
10369         if (asoc->idata_supported) {
10370                 strseq_m = (struct sctp_strseq_mid *)fwdtsn;
10371                 strseq = NULL;
10372         } else {
10373                 strseq = (struct sctp_strseq *)fwdtsn;
10374                 strseq_m = NULL;
10375         }
10376         /*-
10377          * Now populate the strseq list. This is done blindly
10378          * without pulling out duplicate stream info. This is
10379          * inefficient but won't harm the process since the peer will
10380          * look at these in sequence and will thus release anything.
10381          * It could mean we exceed the PMTU and chop off some that
10382          * we could have included.. but this is unlikely (aka 1432/4
10383          * would mean 300+ stream seq's would have to be reported in
10384          * one FWD-TSN. With a bit of work we can later FIX this to
10385          * optimize and pull out duplicates.. but it does add more
10386          * overhead. So for now... not!
10387          */
10388         i = 0;
10389         TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10390                 if (i >= cnt_of_skipped) {
10391                         break;
10392                 }
10393                 if (!asoc->idata_supported && (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
10394                         /* We don't report these */
10395                         continue;
10396                 }
10397                 if (at->rec.data.tsn == advance_peer_ack_point) {
10398                         at->rec.data.fwd_tsn_cnt = 0;
10399                 }
10400                 if (asoc->idata_supported) {
10401                         strseq_m->sid = htons(at->rec.data.sid);
10402                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10403                                 strseq_m->flags = htons(PR_SCTP_UNORDERED_FLAG);
10404                         } else {
10405                                 strseq_m->flags = 0;
10406                         }
10407                         strseq_m->mid = htonl(at->rec.data.mid);
10408                         strseq_m++;
10409                 } else {
10410                         strseq->sid = htons(at->rec.data.sid);
10411                         strseq->ssn = htons((uint16_t)at->rec.data.mid);
10412                         strseq++;
10413                 }
10414                 i++;
10415         }
10416         return;
10417 }
10418 
10419 void
10420 sctp_send_sack(struct sctp_tcb *stcb, int so_locked)
10421 {
10422         /*-
10423          * Queue up a SACK or NR-SACK in the control queue.
10424          * We must first check to see if a SACK or NR-SACK is
10425          * somehow on the control queue.
10426          * If so, we will take and and remove the old one.
10427          */
10428         struct sctp_association *asoc;
10429         struct sctp_tmit_chunk *chk, *a_chk;
10430         struct sctp_sack_chunk *sack;
10431         struct sctp_nr_sack_chunk *nr_sack;
10432         struct sctp_gap_ack_block *gap_descriptor;
10433         const struct sack_track *selector;
10434         int mergeable = 0;
10435         int offset;
10436         caddr_t limit;
10437         uint32_t *dup;
10438         int limit_reached = 0;
10439         unsigned int i, siz, j;
10440         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10441         int num_dups = 0;
10442         int space_req;
10443         uint32_t highest_tsn;
10444         uint8_t flags;
10445         uint8_t type;
10446         uint8_t tsn_map;
10447 
10448         if (stcb->asoc.nrsack_supported == 1) {
10449                 type = SCTP_NR_SELECTIVE_ACK;
10450         } else {
10451                 type = SCTP_SELECTIVE_ACK;
10452         }
10453         a_chk = NULL;
10454         asoc = &stcb->asoc;
10455         SCTP_TCB_LOCK_ASSERT(stcb);
10456         if (asoc->last_data_chunk_from == NULL) {
10457                 /* Hmm we never received anything */
10458                 return;
10459         }
10460         sctp_slide_mapping_arrays(stcb);
10461         sctp_set_rwnd(stcb, asoc);
10462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10463                 if (chk->rec.chunk_id.id == type) {
10464                         /* Hmm, found a sack already on queue, remove it */
10465                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10466                         asoc->ctrl_queue_cnt--;
10467                         a_chk = chk;
10468                         if (a_chk->data) {
10469                                 sctp_m_freem(a_chk->data);
10470                                 a_chk->data = NULL;
10471                         }
10472                         if (a_chk->whoTo) {
10473                                 sctp_free_remote_addr(a_chk->whoTo);
10474                                 a_chk->whoTo = NULL;
10475                         }
10476                         break;
10477                 }
10478         }
10479         if (a_chk == NULL) {
10480                 sctp_alloc_a_chunk(stcb, a_chk);
10481                 if (a_chk == NULL) {
10482                         /* No memory so we drop the idea, and set a timer */
10483                         if (stcb->asoc.delayed_ack) {
10484                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10485                                     stcb->sctp_ep, stcb, NULL,
10486                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10487                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10488                                     stcb->sctp_ep, stcb, NULL);
10489                         } else {
10490                                 stcb->asoc.send_sack = 1;
10491                         }
10492                         return;
10493                 }
10494                 a_chk->copy_by_ref = 0;
10495                 a_chk->rec.chunk_id.id = type;
10496                 a_chk->rec.chunk_id.can_take_data = 1;
10497         }
10498         /* Clear our pkt counts */
10499         asoc->data_pkts_seen = 0;
10500 
10501         a_chk->flags = 0;
10502         a_chk->asoc = asoc;
10503         a_chk->snd_count = 0;
10504         a_chk->send_size = 0;   /* fill in later */
10505         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10506         a_chk->whoTo = NULL;
10507 
10508         if ((asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE) == 0) {
10509                 /*-
10510                  * Ok, the destination for the SACK is unreachable, lets see if
10511                  * we can select an alternate to asoc->last_data_chunk_from
10512                  */
10513                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10514                 if (a_chk->whoTo == NULL) {
10515                         /* Nope, no alternate */
10516                         a_chk->whoTo = asoc->last_data_chunk_from;
10517                 }
10518         } else {
10519                 a_chk->whoTo = asoc->last_data_chunk_from;
10520         }
10521         if (a_chk->whoTo) {
10522                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10523         }
10524         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10525                 highest_tsn = asoc->highest_tsn_inside_map;
10526         } else {
10527                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10528         }
10529         if (highest_tsn == asoc->cumulative_tsn) {
10530                 /* no gaps */
10531                 if (type == SCTP_SELECTIVE_ACK) {
10532                         space_req = sizeof(struct sctp_sack_chunk);
10533                 } else {
10534                         space_req = sizeof(struct sctp_nr_sack_chunk);
10535                 }
10536         } else {
10537                 /* gaps get a cluster */
10538                 space_req = MCLBYTES;
10539         }
10540         /* Ok now lets formulate a MBUF with our sack */
10541         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10542         if ((a_chk->data == NULL) ||
10543             (a_chk->whoTo == NULL)) {
10544                 /* rats, no mbuf memory */
10545                 if (a_chk->data) {
10546                         /* was a problem with the destination */
10547                         sctp_m_freem(a_chk->data);
10548                         a_chk->data = NULL;
10549                 }
10550                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10551                 /* sa_ignore NO_NULL_CHK */
10552                 if (stcb->asoc.delayed_ack) {
10553                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10554                             stcb->sctp_ep, stcb, NULL,
10555                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
10556                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10557                             stcb->sctp_ep, stcb, NULL);
10558                 } else {
10559                         stcb->asoc.send_sack = 1;
10560                 }
10561                 return;
10562         }
10563         /* ok, lets go through and fill it in */
10564         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10565         space = (unsigned int)M_TRAILINGSPACE(a_chk->data);
10566         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10567                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10568         }
10569         limit = mtod(a_chk->data, caddr_t);
10570         limit += space;
10571 
10572         flags = 0;
10573 
10574         if ((asoc->sctp_cmt_on_off > 0) &&
10575             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10576                 /*-
10577                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10578                  * received, then set high bit to 1, else 0. Reset
10579                  * pkts_rcvd.
10580                  */
10581                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10582                 asoc->cmt_dac_pkts_rcvd = 0;
10583         }
10584 #ifdef SCTP_ASOCLOG_OF_TSNS
10585         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10586         stcb->asoc.cumack_log_atsnt++;
10587         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10588                 stcb->asoc.cumack_log_atsnt = 0;
10589         }
10590 #endif
10591         /* reset the readers interpretation */
10592         stcb->freed_by_sorcv_sincelast = 0;
10593 
10594         if (type == SCTP_SELECTIVE_ACK) {
10595                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10596                 nr_sack = NULL;
10597                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10598                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10599                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10600                 } else {
10601                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + highest_tsn + 7) / 8;
10602                 }
10603         } else {
10604                 sack = NULL;
10605                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10606                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10607                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10608                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10609                 } else {
10610                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10611                 }
10612         }
10613 
10614         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10615                 offset = 1;
10616         } else {
10617                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10618         }
10619         if (((type == SCTP_SELECTIVE_ACK) &&
10620             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10621             ((type == SCTP_NR_SELECTIVE_ACK) &&
10622             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10623                 /* we have a gap .. maybe */
10624                 for (i = 0; i < siz; i++) {
10625                         tsn_map = asoc->mapping_array[i];
10626                         if (type == SCTP_SELECTIVE_ACK) {
10627                                 tsn_map |= asoc->nr_mapping_array[i];
10628                         }
10629                         if (i == 0) {
10630                                 /*
10631                                  * Clear all bits corresponding to TSNs
10632                                  * smaller or equal to the cumulative TSN.
10633                                  */
10634                                 tsn_map &= (~0U << (1 - offset));
10635                         }
10636                         selector = &sack_array[tsn_map];
10637                         if (mergeable && selector->right_edge) {
10638                                 /*
10639                                  * Backup, left and right edges were ok to
10640                                  * merge.
10641                                  */
10642                                 num_gap_blocks--;
10643                                 gap_descriptor--;
10644                         }
10645                         if (selector->num_entries == 0)
10646                                 mergeable = 0;
10647                         else {
10648                                 for (j = 0; j < selector->num_entries; j++) {
10649                                         if (mergeable && selector->right_edge) {
10650                                                 /*
10651                                                  * do a merge by NOT setting
10652                                                  * the left side
10653                                                  */
10654                                                 mergeable = 0;
10655                                         } else {
10656                                                 /*
10657                                                  * no merge, set the left
10658                                                  * side
10659                                                  */
10660                                                 mergeable = 0;
10661                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10662                                         }
10663                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10664                                         num_gap_blocks++;
10665                                         gap_descriptor++;
10666                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10667                                                 /* no more room */
10668                                                 limit_reached = 1;
10669                                                 break;
10670                                         }
10671                                 }
10672                                 if (selector->left_edge) {
10673                                         mergeable = 1;
10674                                 }
10675                         }
10676                         if (limit_reached) {
10677                                 /* Reached the limit stop */
10678                                 break;
10679                         }
10680                         offset += 8;
10681                 }
10682         }
10683         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10684             (limit_reached == 0)) {
10685                 mergeable = 0;
10686 
10687                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10688                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10689                 } else {
10690                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10691                 }
10692 
10693                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10694                         offset = 1;
10695                 } else {
10696                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10697                 }
10698                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10699                         /* we have a gap .. maybe */
10700                         for (i = 0; i < siz; i++) {
10701                                 tsn_map = asoc->nr_mapping_array[i];
10702                                 if (i == 0) {
10703                                         /*
10704                                          * Clear all bits corresponding to
10705                                          * TSNs smaller or equal to the
10706                                          * cumulative TSN.
10707                                          */
10708                                         tsn_map &= (~0U << (1 - offset));
10709                                 }
10710                                 selector = &sack_array[tsn_map];
10711                                 if (mergeable && selector->right_edge) {
10712                                         /*
10713                                          * Backup, left and right edges were
10714                                          * ok to merge.
10715                                          */
10716                                         num_nr_gap_blocks--;
10717                                         gap_descriptor--;
10718                                 }
10719                                 if (selector->num_entries == 0)
10720                                         mergeable = 0;
10721                                 else {
10722                                         for (j = 0; j < selector->num_entries; j++) {
10723                                                 if (mergeable && selector->right_edge) {
10724                                                         /*
10725                                                          * do a merge by NOT
10726                                                          * setting the left
10727                                                          * side
10728                                                          */
10729                                                         mergeable = 0;
10730                                                 } else {
10731                                                         /*
10732                                                          * no merge, set the
10733                                                          * left side
10734                                                          */
10735                                                         mergeable = 0;
10736                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10737                                                 }
10738                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10739                                                 num_nr_gap_blocks++;
10740                                                 gap_descriptor++;
10741                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10742                                                         /* no more room */
10743                                                         limit_reached = 1;
10744                                                         break;
10745                                                 }
10746                                         }
10747                                         if (selector->left_edge) {
10748                                                 mergeable = 1;
10749                                         }
10750                                 }
10751                                 if (limit_reached) {
10752                                         /* Reached the limit stop */
10753                                         break;
10754                                 }
10755                                 offset += 8;
10756                         }
10757                 }
10758         }
10759         /* now we must add any dups we are going to report. */
10760         if ((limit_reached == 0) && (asoc->numduptsns)) {
10761                 dup = (uint32_t *)gap_descriptor;
10762                 for (i = 0; i < asoc->numduptsns; i++) {
10763                         *dup = htonl(asoc->dup_tsns[i]);
10764                         dup++;
10765                         num_dups++;
10766                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10767                                 /* no more room */
10768                                 break;
10769                         }
10770                 }
10771                 asoc->numduptsns = 0;
10772         }
10773         /*
10774          * now that the chunk is prepared queue it to the control chunk
10775          * queue.
10776          */
10777         if (type == SCTP_SELECTIVE_ACK) {
10778                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_sack_chunk) +
10779                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10780                     num_dups * sizeof(int32_t));
10781                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10782                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10783                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10784                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10785                 sack->sack.num_dup_tsns = htons(num_dups);
10786                 sack->ch.chunk_type = type;
10787                 sack->ch.chunk_flags = flags;
10788                 sack->ch.chunk_length = htons(a_chk->send_size);
10789         } else {
10790                 a_chk->send_size = (uint16_t)(sizeof(struct sctp_nr_sack_chunk) +
10791                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10792                     num_dups * sizeof(int32_t));
10793                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10794                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10795                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10796                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10797                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10798                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10799                 nr_sack->nr_sack.reserved = 0;
10800                 nr_sack->ch.chunk_type = type;
10801                 nr_sack->ch.chunk_flags = flags;
10802                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10803         }
10804         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10805         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10806         asoc->ctrl_queue_cnt++;
10807         asoc->send_sack = 0;
10808         SCTP_STAT_INCR(sctps_sendsacks);
10809         return;
10810 }
10811 
10812 void
10813 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked)
10814 {
10815         struct mbuf *m_abort, *m, *m_last;
10816         struct mbuf *m_out, *m_end = NULL;
10817         struct sctp_abort_chunk *abort;
10818         struct sctp_auth_chunk *auth = NULL;
10819         struct sctp_nets *net;
10820         uint32_t vtag;
10821         uint32_t auth_offset = 0;
10822         int error;
10823         uint16_t cause_len, chunk_len, padding_len;
10824 
10825         SCTP_TCB_LOCK_ASSERT(stcb);
10826         /*-
10827          * Add an AUTH chunk, if chunk requires it and save the offset into
10828          * the chain for AUTH
10829          */
10830         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10831             stcb->asoc.peer_auth_chunks)) {
10832                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10833                     stcb, SCTP_ABORT_ASSOCIATION);
10834                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10835         } else {
10836                 m_out = NULL;
10837         }
10838         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10839         if (m_abort == NULL) {
10840                 if (m_out) {
10841                         sctp_m_freem(m_out);
10842                 }
10843                 if (operr) {
10844                         sctp_m_freem(operr);
10845                 }
10846                 return;
10847         }
10848         /* link in any error */
10849         SCTP_BUF_NEXT(m_abort) = operr;
10850         cause_len = 0;
10851         m_last = NULL;
10852         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10853                 cause_len += (uint16_t)SCTP_BUF_LEN(m);
10854                 if (SCTP_BUF_NEXT(m) == NULL) {
10855                         m_last = m;
10856                 }
10857         }
10858         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10859         chunk_len = (uint16_t)sizeof(struct sctp_abort_chunk) + cause_len;
10860         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10861         if (m_out == NULL) {
10862                 /* NO Auth chunk prepended, so reserve space in front */
10863                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10864                 m_out = m_abort;
10865         } else {
10866                 /* Put AUTH chunk at the front of the chain */
10867                 SCTP_BUF_NEXT(m_end) = m_abort;
10868         }
10869         if (stcb->asoc.alternate) {
10870                 net = stcb->asoc.alternate;
10871         } else {
10872                 net = stcb->asoc.primary_destination;
10873         }
10874         /* Fill in the ABORT chunk header. */
10875         abort = mtod(m_abort, struct sctp_abort_chunk *);
10876         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10877         if (stcb->asoc.peer_vtag == 0) {
10878                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10879                 vtag = stcb->asoc.my_vtag;
10880                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10881         } else {
10882                 vtag = stcb->asoc.peer_vtag;
10883                 abort->ch.chunk_flags = 0;
10884         }
10885         abort->ch.chunk_length = htons(chunk_len);
10886         /* Add padding, if necessary. */
10887         if (padding_len > 0) {
10888                 if ((m_last == NULL) ||
10889                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10890                         sctp_m_freem(m_out);
10891                         return;
10892                 }
10893         }
10894         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10895             (struct sockaddr *)&net->ro._l_addr,
10896             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10897             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10898             stcb->asoc.primary_destination->port, NULL,
10899             0, 0,
10900             so_locked))) {
10901                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10902                 if (error == ENOBUFS) {
10903                         stcb->asoc.ifp_had_enobuf = 1;
10904                         SCTP_STAT_INCR(sctps_lowlevelerr);
10905                 }
10906         } else {
10907                 stcb->asoc.ifp_had_enobuf = 0;
10908         }
10909         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10910 }
10911 
10912 void
10913 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10914     struct sctp_nets *net,
10915     int reflect_vtag)
10916 {
10917         /* formulate and SEND a SHUTDOWN-COMPLETE */
10918         struct mbuf *m_shutdown_comp;
10919         struct sctp_shutdown_complete_chunk *shutdown_complete;
10920         uint32_t vtag;
10921         int error;
10922         uint8_t flags;
10923 
10924         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10925         if (m_shutdown_comp == NULL) {
10926                 /* no mbuf's */
10927                 return;
10928         }
10929         if (reflect_vtag) {
10930                 flags = SCTP_HAD_NO_TCB;
10931                 vtag = stcb->asoc.my_vtag;
10932         } else {
10933                 flags = 0;
10934                 vtag = stcb->asoc.peer_vtag;
10935         }
10936         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10937         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10938         shutdown_complete->ch.chunk_flags = flags;
10939         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10940         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10941         if ((error = sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10942             (struct sockaddr *)&net->ro._l_addr,
10943             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10944             stcb->sctp_ep->sctp_lport, stcb->rport,
10945             htonl(vtag),
10946             net->port, NULL,
10947             0, 0,
10948             SCTP_SO_NOT_LOCKED))) {
10949                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
10950                 if (error == ENOBUFS) {
10951                         stcb->asoc.ifp_had_enobuf = 1;
10952                         SCTP_STAT_INCR(sctps_lowlevelerr);
10953                 }
10954         } else {
10955                 stcb->asoc.ifp_had_enobuf = 0;
10956         }
10957         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10958         return;
10959 }
10960 
10961 static void
10962 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10963     struct sctphdr *sh, uint32_t vtag,
10964     uint8_t type, struct mbuf *cause,
10965     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10966     uint32_t vrf_id, uint16_t port)
10967 {
10968         struct mbuf *o_pak;
10969         struct mbuf *mout;
10970         struct sctphdr *shout;
10971         struct sctp_chunkhdr *ch;
10972 #if defined(INET) || defined(INET6)
10973         struct udphdr *udp;
10974 #endif
10975         int ret, len, cause_len, padding_len;
10976 #ifdef INET
10977         struct sockaddr_in *src_sin, *dst_sin;
10978         struct ip *ip;
10979 #endif
10980 #ifdef INET6
10981         struct sockaddr_in6 *src_sin6, *dst_sin6;
10982         struct ip6_hdr *ip6;
10983 #endif
10984 
10985         /* Compute the length of the cause and add final padding. */
10986         cause_len = 0;
10987         if (cause != NULL) {
10988                 struct mbuf *m_at, *m_last = NULL;
10989 
10990                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10991                         if (SCTP_BUF_NEXT(m_at) == NULL)
10992                                 m_last = m_at;
10993                         cause_len += SCTP_BUF_LEN(m_at);
10994                 }
10995                 padding_len = cause_len % 4;
10996                 if (padding_len != 0) {
10997                         padding_len = 4 - padding_len;
10998                 }
10999                 if (padding_len != 0) {
11000                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
11001                                 sctp_m_freem(cause);
11002                                 return;
11003                         }
11004                 }
11005         } else {
11006                 padding_len = 0;
11007         }
11008         /* Get an mbuf for the header. */
11009         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11010         switch (dst->sa_family) {
11011 #ifdef INET
11012         case AF_INET:
11013                 len += sizeof(struct ip);
11014                 break;
11015 #endif
11016 #ifdef INET6
11017         case AF_INET6:
11018                 len += sizeof(struct ip6_hdr);
11019                 break;
11020 #endif
11021         default:
11022                 break;
11023         }
11024 #if defined(INET) || defined(INET6)
11025         if (port) {
11026                 len += sizeof(struct udphdr);
11027         }
11028 #endif
11029         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11030         if (mout == NULL) {
11031                 if (cause) {
11032                         sctp_m_freem(cause);
11033                 }
11034                 return;
11035         }
11036         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11037         SCTP_BUF_LEN(mout) = len;
11038         SCTP_BUF_NEXT(mout) = cause;
11039         M_SETFIB(mout, fibnum);
11040         mout->m_pkthdr.flowid = mflowid;
11041         M_HASHTYPE_SET(mout, mflowtype);
11042 #ifdef INET
11043         ip = NULL;
11044 #endif
11045 #ifdef INET6
11046         ip6 = NULL;
11047 #endif
11048         switch (dst->sa_family) {
11049 #ifdef INET
11050         case AF_INET:
11051                 src_sin = (struct sockaddr_in *)src;
11052                 dst_sin = (struct sockaddr_in *)dst;
11053                 ip = mtod(mout, struct ip *);
11054                 ip->ip_v = IPVERSION;
11055                 ip->ip_hl = (sizeof(struct ip) >> 2);
11056                 ip->ip_tos = 0;
11057                 ip->ip_off = htons(IP_DF);
11058                 ip_fillid(ip);
11059                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11060                 if (port) {
11061                         ip->ip_p = IPPROTO_UDP;
11062                 } else {
11063                         ip->ip_p = IPPROTO_SCTP;
11064                 }
11065                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11066                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11067                 ip->ip_sum = 0;
11068                 len = sizeof(struct ip);
11069                 shout = (struct sctphdr *)((caddr_t)ip + len);
11070                 break;
11071 #endif
11072 #ifdef INET6
11073         case AF_INET6:
11074                 src_sin6 = (struct sockaddr_in6 *)src;
11075                 dst_sin6 = (struct sockaddr_in6 *)dst;
11076                 ip6 = mtod(mout, struct ip6_hdr *);
11077                 ip6->ip6_flow = htonl(0x60000000);
11078                 if (V_ip6_auto_flowlabel) {
11079                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11080                 }
11081                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11082                 if (port) {
11083                         ip6->ip6_nxt = IPPROTO_UDP;
11084                 } else {
11085                         ip6->ip6_nxt = IPPROTO_SCTP;
11086                 }
11087                 ip6->ip6_src = dst_sin6->sin6_addr;
11088                 ip6->ip6_dst = src_sin6->sin6_addr;
11089                 len = sizeof(struct ip6_hdr);
11090                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11091                 break;
11092 #endif
11093         default:
11094                 len = 0;
11095                 shout = mtod(mout, struct sctphdr *);
11096                 break;
11097         }
11098 #if defined(INET) || defined(INET6)
11099         if (port) {
11100                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11101                         sctp_m_freem(mout);
11102                         return;
11103                 }
11104                 udp = (struct udphdr *)shout;
11105                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11106                 udp->uh_dport = port;
11107                 udp->uh_sum = 0;
11108                 udp->uh_ulen = htons((uint16_t)(sizeof(struct udphdr) +
11109                     sizeof(struct sctphdr) +
11110                     sizeof(struct sctp_chunkhdr) +
11111                     cause_len + padding_len));
11112                 len += sizeof(struct udphdr);
11113                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11114         } else {
11115                 udp = NULL;
11116         }
11117 #endif
11118         shout->src_port = sh->dest_port;
11119         shout->dest_port = sh->src_port;
11120         shout->checksum = 0;
11121         if (vtag) {
11122                 shout->v_tag = htonl(vtag);
11123         } else {
11124                 shout->v_tag = sh->v_tag;
11125         }
11126         len += sizeof(struct sctphdr);
11127         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11128         ch->chunk_type = type;
11129         if (vtag) {
11130                 ch->chunk_flags = 0;
11131         } else {
11132                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11133         }
11134         ch->chunk_length = htons((uint16_t)(sizeof(struct sctp_chunkhdr) + cause_len));
11135         len += sizeof(struct sctp_chunkhdr);
11136         len += cause_len + padding_len;
11137 
11138         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11139                 sctp_m_freem(mout);
11140                 return;
11141         }
11142         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11143         switch (dst->sa_family) {
11144 #ifdef INET
11145         case AF_INET:
11146                 if (port) {
11147                         if (V_udp_cksum) {
11148                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11149                         } else {
11150                                 udp->uh_sum = 0;
11151                         }
11152                 }
11153                 ip->ip_len = htons(len);
11154                 if (port) {
11155                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11156                         SCTP_STAT_INCR(sctps_sendswcrc);
11157                         if (V_udp_cksum) {
11158                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11159                         }
11160                 } else {
11161                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11162                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11163                         SCTP_STAT_INCR(sctps_sendhwcrc);
11164                 }
11165 #ifdef SCTP_PACKET_LOGGING
11166                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11167                         sctp_packet_log(o_pak);
11168                 }
11169 #endif
11170                 SCTP_PROBE5(send, NULL, NULL, ip, NULL, shout);
11171                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11172                 break;
11173 #endif
11174 #ifdef INET6
11175         case AF_INET6:
11176                 ip6->ip6_plen = htons((uint16_t)(len - sizeof(struct ip6_hdr)));
11177                 if (port) {
11178                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11179                         SCTP_STAT_INCR(sctps_sendswcrc);
11180                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11181                                 udp->uh_sum = 0xffff;
11182                         }
11183                 } else {
11184                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11185                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11186                         SCTP_STAT_INCR(sctps_sendhwcrc);
11187                 }
11188 #ifdef SCTP_PACKET_LOGGING
11189                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11190                         sctp_packet_log(o_pak);
11191                 }
11192 #endif
11193                 SCTP_PROBE5(send, NULL, NULL, ip6, NULL, shout);
11194                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11195                 break;
11196 #endif
11197         default:
11198                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11199                     dst->sa_family);
11200                 sctp_m_freem(mout);
11201                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11202                 return;
11203         }
11204         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
11205         if (port) {
11206                 UDPSTAT_INC(udps_opackets);
11207         }
11208         SCTP_STAT_INCR(sctps_sendpackets);
11209         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11210         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11211         if (ret) {
11212                 SCTP_STAT_INCR(sctps_senderrors);
11213         }
11214         return;
11215 }
11216 
11217 void
11218 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11219     struct sctphdr *sh,
11220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11221     uint32_t vrf_id, uint16_t port)
11222 {
11223         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11224             mflowtype, mflowid, fibnum,
11225             vrf_id, port);
11226 }
11227 
11228 void
11229 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked)
11230 {
11231         struct sctp_tmit_chunk *chk;
11232         struct sctp_heartbeat_chunk *hb;
11233         struct timeval now;
11234 
11235         SCTP_TCB_LOCK_ASSERT(stcb);
11236         if (net == NULL) {
11237                 return;
11238         }
11239         (void)SCTP_GETTIME_TIMEVAL(&now);
11240         switch (net->ro._l_addr.sa.sa_family) {
11241 #ifdef INET
11242         case AF_INET:
11243                 break;
11244 #endif
11245 #ifdef INET6
11246         case AF_INET6:
11247                 break;
11248 #endif
11249         default:
11250                 return;
11251         }
11252         sctp_alloc_a_chunk(stcb, chk);
11253         if (chk == NULL) {
11254                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11255                 return;
11256         }
11257 
11258         chk->copy_by_ref = 0;
11259         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11260         chk->rec.chunk_id.can_take_data = 1;
11261         chk->flags = 0;
11262         chk->asoc = &stcb->asoc;
11263         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11264 
11265         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11266         if (chk->data == NULL) {
11267                 sctp_free_a_chunk(stcb, chk, so_locked);
11268                 return;
11269         }
11270         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11271         SCTP_BUF_LEN(chk->data) = chk->send_size;
11272         chk->sent = SCTP_DATAGRAM_UNSENT;
11273         chk->snd_count = 0;
11274         chk->whoTo = net;
11275         atomic_add_int(&chk->whoTo->ref_count, 1);
11276         /* Now we have a mbuf that we can fill in with the details */
11277         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11278         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11279         /* fill out chunk header */
11280         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11281         hb->ch.chunk_flags = 0;
11282         hb->ch.chunk_length = htons(chk->send_size);
11283         /* Fill out hb parameter */
11284         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11285         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11286         hb->heartbeat.hb_info.time_value_1 = (uint32_t)now.tv_sec;
11287         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11288         /* Did our user request this one, put it in */
11289         hb->heartbeat.hb_info.addr_family = (uint8_t)net->ro._l_addr.sa.sa_family;
11290         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11291         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11292                 /*
11293                  * we only take from the entropy pool if the address is not
11294                  * confirmed.
11295                  */
11296                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11297                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11298         } else {
11299                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11300                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11301         }
11302         switch (net->ro._l_addr.sa.sa_family) {
11303 #ifdef INET
11304         case AF_INET:
11305                 memcpy(hb->heartbeat.hb_info.address,
11306                     &net->ro._l_addr.sin.sin_addr,
11307                     sizeof(net->ro._l_addr.sin.sin_addr));
11308                 break;
11309 #endif
11310 #ifdef INET6
11311         case AF_INET6:
11312                 memcpy(hb->heartbeat.hb_info.address,
11313                     &net->ro._l_addr.sin6.sin6_addr,
11314                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11315                 break;
11316 #endif
11317         default:
11318                 if (chk->data) {
11319                         sctp_m_freem(chk->data);
11320                         chk->data = NULL;
11321                 }
11322                 sctp_free_a_chunk(stcb, chk, so_locked);
11323                 return;
11324                 break;
11325         }
11326         net->hb_responded = 0;
11327         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11328         stcb->asoc.ctrl_queue_cnt++;
11329         SCTP_STAT_INCR(sctps_sendheartbeat);
11330         return;
11331 }
11332 
11333 void
11334 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11335     uint32_t high_tsn)
11336 {
11337         struct sctp_association *asoc;
11338         struct sctp_ecne_chunk *ecne;
11339         struct sctp_tmit_chunk *chk;
11340 
11341         if (net == NULL) {
11342                 return;
11343         }
11344         asoc = &stcb->asoc;
11345         SCTP_TCB_LOCK_ASSERT(stcb);
11346         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11347                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11348                         /* found a previous ECN_ECHO update it if needed */
11349                         uint32_t cnt, ctsn;
11350 
11351                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11352                         ctsn = ntohl(ecne->tsn);
11353                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11354                                 ecne->tsn = htonl(high_tsn);
11355                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11356                         }
11357                         cnt = ntohl(ecne->num_pkts_since_cwr);
11358                         cnt++;
11359                         ecne->num_pkts_since_cwr = htonl(cnt);
11360                         return;
11361                 }
11362         }
11363         /* nope could not find one to update so we must build one */
11364         sctp_alloc_a_chunk(stcb, chk);
11365         if (chk == NULL) {
11366                 return;
11367         }
11368         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11369         chk->copy_by_ref = 0;
11370         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11371         chk->rec.chunk_id.can_take_data = 0;
11372         chk->flags = 0;
11373         chk->asoc = &stcb->asoc;
11374         chk->send_size = sizeof(struct sctp_ecne_chunk);
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, SCTP_SO_NOT_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 
11387         stcb->asoc.ecn_echo_cnt_onq++;
11388         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11389         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11390         ecne->ch.chunk_flags = 0;
11391         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11392         ecne->tsn = htonl(high_tsn);
11393         ecne->num_pkts_since_cwr = htonl(1);
11394         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11395         asoc->ctrl_queue_cnt++;
11396 }
11397 
11398 void
11399 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11400     struct mbuf *m, int len, int iphlen, int bad_crc)
11401 {
11402         struct sctp_association *asoc;
11403         struct sctp_pktdrop_chunk *drp;
11404         struct sctp_tmit_chunk *chk;
11405         uint8_t *datap;
11406         int was_trunc = 0;
11407         int fullsz = 0;
11408         long spc;
11409         int offset;
11410         struct sctp_chunkhdr *ch, chunk_buf;
11411         unsigned int chk_length;
11412 
11413         if (!stcb) {
11414                 return;
11415         }
11416         asoc = &stcb->asoc;
11417         SCTP_TCB_LOCK_ASSERT(stcb);
11418         if (asoc->pktdrop_supported == 0) {
11419                 /*-
11420                  * peer must declare support before I send one.
11421                  */
11422                 return;
11423         }
11424         if (stcb->sctp_socket == NULL) {
11425                 return;
11426         }
11427         sctp_alloc_a_chunk(stcb, chk);
11428         if (chk == NULL) {
11429                 return;
11430         }
11431         chk->copy_by_ref = 0;
11432         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11433         chk->rec.chunk_id.can_take_data = 1;
11434         chk->flags = 0;
11435         len -= iphlen;
11436         chk->send_size = len;
11437         /* Validate that we do not have an ABORT in here. */
11438         offset = iphlen + sizeof(struct sctphdr);
11439         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11440             sizeof(*ch), (uint8_t *)&chunk_buf);
11441         while (ch != NULL) {
11442                 chk_length = ntohs(ch->chunk_length);
11443                 if (chk_length < sizeof(*ch)) {
11444                         /* break to abort land */
11445                         break;
11446                 }
11447                 switch (ch->chunk_type) {
11448                 case SCTP_PACKET_DROPPED:
11449                 case SCTP_ABORT_ASSOCIATION:
11450                 case SCTP_INITIATION_ACK:
11451                         /**
11452                          * We don't respond with an PKT-DROP to an ABORT
11453                          * or PKT-DROP. We also do not respond to an
11454                          * INIT-ACK, because we can't know if the initiation
11455                          * tag is correct or not.
11456                          */
11457                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11458                         return;
11459                 default:
11460                         break;
11461                 }
11462                 offset += SCTP_SIZE32(chk_length);
11463                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11464                     sizeof(*ch), (uint8_t *)&chunk_buf);
11465         }
11466 
11467         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11468             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11469                 /*
11470                  * only send 1 mtu worth, trim off the excess on the end.
11471                  */
11472                 fullsz = len;
11473                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11474                 was_trunc = 1;
11475         }
11476         chk->asoc = &stcb->asoc;
11477         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11478         if (chk->data == NULL) {
11479 jump_out:
11480                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11481                 return;
11482         }
11483         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11484         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11485         if (drp == NULL) {
11486                 sctp_m_freem(chk->data);
11487                 chk->data = NULL;
11488                 goto jump_out;
11489         }
11490         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11491             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11492         chk->book_size_scale = 0;
11493         if (was_trunc) {
11494                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11495                 drp->trunc_len = htons(fullsz);
11496                 /*
11497                  * Len is already adjusted to size minus overhead above take
11498                  * out the pkt_drop chunk itself from it.
11499                  */
11500                 chk->send_size = (uint16_t)(len - sizeof(struct sctp_pktdrop_chunk));
11501                 len = chk->send_size;
11502         } else {
11503                 /* no truncation needed */
11504                 drp->ch.chunk_flags = 0;
11505                 drp->trunc_len = htons(0);
11506         }
11507         if (bad_crc) {
11508                 drp->ch.chunk_flags |= SCTP_BADCRC;
11509         }
11510         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11511         SCTP_BUF_LEN(chk->data) = chk->send_size;
11512         chk->sent = SCTP_DATAGRAM_UNSENT;
11513         chk->snd_count = 0;
11514         if (net) {
11515                 /* we should hit here */
11516                 chk->whoTo = net;
11517                 atomic_add_int(&chk->whoTo->ref_count, 1);
11518         } else {
11519                 chk->whoTo = NULL;
11520         }
11521         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11522         drp->ch.chunk_length = htons(chk->send_size);
11523         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11524         if (spc < 0) {
11525                 spc = 0;
11526         }
11527         drp->bottle_bw = htonl(spc);
11528         if (asoc->my_rwnd) {
11529                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11530                     asoc->size_on_all_streams +
11531                     asoc->my_rwnd_control_len +
11532                     SCTP_SBAVAIL(&stcb->sctp_socket->so_rcv));
11533         } else {
11534                 /*-
11535                  * If my rwnd is 0, possibly from mbuf depletion as well as
11536                  * space used, tell the peer there is NO space aka onq == bw
11537                  */
11538                 drp->current_onq = htonl(spc);
11539         }
11540         drp->reserved = 0;
11541         datap = drp->data;
11542         m_copydata(m, iphlen, len, (caddr_t)datap);
11543         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11544         asoc->ctrl_queue_cnt++;
11545 }
11546 
11547 void
11548 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11549 {
11550         struct sctp_association *asoc;
11551         struct sctp_cwr_chunk *cwr;
11552         struct sctp_tmit_chunk *chk;
11553 
11554         SCTP_TCB_LOCK_ASSERT(stcb);
11555         if (net == NULL) {
11556                 return;
11557         }
11558         asoc = &stcb->asoc;
11559         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11560                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11561                         /*
11562                          * found a previous CWR queued to same destination
11563                          * update it if needed
11564                          */
11565                         uint32_t ctsn;
11566 
11567                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11568                         ctsn = ntohl(cwr->tsn);
11569                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11570                                 cwr->tsn = htonl(high_tsn);
11571                         }
11572                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11573                                 /* Make sure override is carried */
11574                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11575                         }
11576                         return;
11577                 }
11578         }
11579         sctp_alloc_a_chunk(stcb, chk);
11580         if (chk == NULL) {
11581                 return;
11582         }
11583         chk->copy_by_ref = 0;
11584         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11585         chk->rec.chunk_id.can_take_data = 1;
11586         chk->flags = 0;
11587         chk->asoc = asoc;
11588         chk->send_size = sizeof(struct sctp_cwr_chunk);
11589         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11590         if (chk->data == NULL) {
11591                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11592                 return;
11593         }
11594         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11595         SCTP_BUF_LEN(chk->data) = chk->send_size;
11596         chk->sent = SCTP_DATAGRAM_UNSENT;
11597         chk->snd_count = 0;
11598         chk->whoTo = net;
11599         atomic_add_int(&chk->whoTo->ref_count, 1);
11600         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11601         cwr->ch.chunk_type = SCTP_ECN_CWR;
11602         cwr->ch.chunk_flags = override;
11603         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11604         cwr->tsn = htonl(high_tsn);
11605         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
11606         asoc->ctrl_queue_cnt++;
11607 }
11608 
11609 static int
11610 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11611     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11612 {
11613         uint16_t len, old_len, i;
11614         struct sctp_stream_reset_out_request *req_out;
11615         struct sctp_chunkhdr *ch;
11616         int at;
11617         int number_entries = 0;
11618 
11619         ch = mtod(chk->data, struct sctp_chunkhdr *);
11620         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11621         /* get to new offset for the param. */
11622         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11623         /* now how long will this param be? */
11624         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11625                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11626                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11627                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11628                         number_entries++;
11629                 }
11630         }
11631         if (number_entries == 0) {
11632                 return (0);
11633         }
11634         if (number_entries == stcb->asoc.streamoutcnt) {
11635                 number_entries = 0;
11636         }
11637         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11638                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11639         }
11640         len = (uint16_t)(sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11641         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11642         req_out->ph.param_length = htons(len);
11643         req_out->request_seq = htonl(seq);
11644         req_out->response_seq = htonl(resp_seq);
11645         req_out->send_reset_at_tsn = htonl(last_sent);
11646         at = 0;
11647         if (number_entries) {
11648                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11649                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11650                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11651                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11652                                 req_out->list_of_streams[at] = htons(i);
11653                                 at++;
11654                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11655                                 if (at >= number_entries) {
11656                                         break;
11657                                 }
11658                         }
11659                 }
11660         } else {
11661                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11662                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11663                 }
11664         }
11665         if (SCTP_SIZE32(len) > len) {
11666                 /*-
11667                  * Need to worry about the pad we may end up adding to the
11668                  * end. This is easy since the struct is either aligned to 4
11669                  * bytes or 2 bytes off.
11670                  */
11671                 req_out->list_of_streams[number_entries] = 0;
11672         }
11673         /* now fix the chunk length */
11674         ch->chunk_length = htons(len + old_len);
11675         chk->book_size = len + old_len;
11676         chk->book_size_scale = 0;
11677         chk->send_size = SCTP_SIZE32(chk->book_size);
11678         SCTP_BUF_LEN(chk->data) = chk->send_size;
11679         return (1);
11680 }
11681 
11682 static void
11683 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11684     int number_entries, uint16_t *list,
11685     uint32_t seq)
11686 {
11687         uint16_t len, old_len, i;
11688         struct sctp_stream_reset_in_request *req_in;
11689         struct sctp_chunkhdr *ch;
11690 
11691         ch = mtod(chk->data, struct sctp_chunkhdr *);
11692         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11693 
11694         /* get to new offset for the param. */
11695         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11696         /* now how long will this param be? */
11697         len = (uint16_t)(sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11698         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11699         req_in->ph.param_length = htons(len);
11700         req_in->request_seq = htonl(seq);
11701         if (number_entries) {
11702                 for (i = 0; i < number_entries; i++) {
11703                         req_in->list_of_streams[i] = htons(list[i]);
11704                 }
11705         }
11706         if (SCTP_SIZE32(len) > len) {
11707                 /*-
11708                  * Need to worry about the pad we may end up adding to the
11709                  * end. This is easy since the struct is either aligned to 4
11710                  * bytes or 2 bytes off.
11711                  */
11712                 req_in->list_of_streams[number_entries] = 0;
11713         }
11714         /* now fix the chunk length */
11715         ch->chunk_length = htons(len + old_len);
11716         chk->book_size = len + old_len;
11717         chk->book_size_scale = 0;
11718         chk->send_size = SCTP_SIZE32(chk->book_size);
11719         SCTP_BUF_LEN(chk->data) = chk->send_size;
11720         return;
11721 }
11722 
11723 static void
11724 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11725     uint32_t seq)
11726 {
11727         uint16_t len, old_len;
11728         struct sctp_stream_reset_tsn_request *req_tsn;
11729         struct sctp_chunkhdr *ch;
11730 
11731         ch = mtod(chk->data, struct sctp_chunkhdr *);
11732         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11733 
11734         /* get to new offset for the param. */
11735         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11736         /* now how long will this param be? */
11737         len = sizeof(struct sctp_stream_reset_tsn_request);
11738         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11739         req_tsn->ph.param_length = htons(len);
11740         req_tsn->request_seq = htonl(seq);
11741 
11742         /* now fix the chunk length */
11743         ch->chunk_length = htons(len + old_len);
11744         chk->send_size = len + old_len;
11745         chk->book_size = SCTP_SIZE32(chk->send_size);
11746         chk->book_size_scale = 0;
11747         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11748         return;
11749 }
11750 
11751 void
11752 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11753     uint32_t resp_seq, uint32_t result)
11754 {
11755         uint16_t len, old_len;
11756         struct sctp_stream_reset_response *resp;
11757         struct sctp_chunkhdr *ch;
11758 
11759         ch = mtod(chk->data, struct sctp_chunkhdr *);
11760         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11761 
11762         /* get to new offset for the param. */
11763         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11764         /* now how long will this param be? */
11765         len = sizeof(struct sctp_stream_reset_response);
11766         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11767         resp->ph.param_length = htons(len);
11768         resp->response_seq = htonl(resp_seq);
11769         resp->result = ntohl(result);
11770 
11771         /* now fix the chunk length */
11772         ch->chunk_length = htons(len + old_len);
11773         chk->book_size = len + old_len;
11774         chk->book_size_scale = 0;
11775         chk->send_size = SCTP_SIZE32(chk->book_size);
11776         SCTP_BUF_LEN(chk->data) = chk->send_size;
11777         return;
11778 }
11779 
11780 void
11781 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11782     struct sctp_stream_reset_list *ent,
11783     int response)
11784 {
11785         struct sctp_association *asoc;
11786         struct sctp_tmit_chunk *chk;
11787         struct sctp_chunkhdr *ch;
11788 
11789         asoc = &stcb->asoc;
11790 
11791         /*
11792          * Reset our last reset action to the new one IP -> response
11793          * (PERFORMED probably). This assures that if we fail to send, a
11794          * retran from the peer will get the new response.
11795          */
11796         asoc->last_reset_action[0] = response;
11797         if (asoc->stream_reset_outstanding) {
11798                 return;
11799         }
11800         sctp_alloc_a_chunk(stcb, chk);
11801         if (chk == NULL) {
11802                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11803                 return;
11804         }
11805         chk->copy_by_ref = 0;
11806         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11807         chk->rec.chunk_id.can_take_data = 0;
11808         chk->flags = 0;
11809         chk->asoc = &stcb->asoc;
11810         chk->book_size = sizeof(struct sctp_chunkhdr);
11811         chk->send_size = SCTP_SIZE32(chk->book_size);
11812         chk->book_size_scale = 0;
11813         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11814         if (chk->data == NULL) {
11815                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11816                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11817                 return;
11818         }
11819         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11820         /* setup chunk parameters */
11821         chk->sent = SCTP_DATAGRAM_UNSENT;
11822         chk->snd_count = 0;
11823         if (stcb->asoc.alternate) {
11824                 chk->whoTo = stcb->asoc.alternate;
11825         } else {
11826                 chk->whoTo = stcb->asoc.primary_destination;
11827         }
11828         ch = mtod(chk->data, struct sctp_chunkhdr *);
11829         ch->chunk_type = SCTP_STREAM_RESET;
11830         ch->chunk_flags = 0;
11831         ch->chunk_length = htons(chk->book_size);
11832         atomic_add_int(&chk->whoTo->ref_count, 1);
11833         SCTP_BUF_LEN(chk->data) = chk->send_size;
11834         sctp_add_stream_reset_result(chk, ent->seq, response);
11835         /* insert the chunk for sending */
11836         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11837             chk,
11838             sctp_next);
11839         asoc->ctrl_queue_cnt++;
11840 }
11841 
11842 void
11843 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11844     uint32_t resp_seq, uint32_t result,
11845     uint32_t send_una, uint32_t recv_next)
11846 {
11847         uint16_t len, old_len;
11848         struct sctp_stream_reset_response_tsn *resp;
11849         struct sctp_chunkhdr *ch;
11850 
11851         ch = mtod(chk->data, struct sctp_chunkhdr *);
11852         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11853 
11854         /* get to new offset for the param. */
11855         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11856         /* now how long will this param be? */
11857         len = sizeof(struct sctp_stream_reset_response_tsn);
11858         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11859         resp->ph.param_length = htons(len);
11860         resp->response_seq = htonl(resp_seq);
11861         resp->result = htonl(result);
11862         resp->senders_next_tsn = htonl(send_una);
11863         resp->receivers_next_tsn = htonl(recv_next);
11864 
11865         /* now fix the chunk length */
11866         ch->chunk_length = htons(len + old_len);
11867         chk->book_size = len + old_len;
11868         chk->send_size = SCTP_SIZE32(chk->book_size);
11869         chk->book_size_scale = 0;
11870         SCTP_BUF_LEN(chk->data) = chk->send_size;
11871         return;
11872 }
11873 
11874 static void
11875 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11876     uint32_t seq,
11877     uint16_t adding)
11878 {
11879         uint16_t len, old_len;
11880         struct sctp_chunkhdr *ch;
11881         struct sctp_stream_reset_add_strm *addstr;
11882 
11883         ch = mtod(chk->data, struct sctp_chunkhdr *);
11884         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11885 
11886         /* get to new offset for the param. */
11887         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11888         /* now how long will this param be? */
11889         len = sizeof(struct sctp_stream_reset_add_strm);
11890 
11891         /* Fill it out. */
11892         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11893         addstr->ph.param_length = htons(len);
11894         addstr->request_seq = htonl(seq);
11895         addstr->number_of_streams = htons(adding);
11896         addstr->reserved = 0;
11897 
11898         /* now fix the chunk length */
11899         ch->chunk_length = htons(len + old_len);
11900         chk->send_size = len + old_len;
11901         chk->book_size = SCTP_SIZE32(chk->send_size);
11902         chk->book_size_scale = 0;
11903         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11904         return;
11905 }
11906 
11907 static void
11908 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11909     uint32_t seq,
11910     uint16_t adding)
11911 {
11912         uint16_t len, old_len;
11913         struct sctp_chunkhdr *ch;
11914         struct sctp_stream_reset_add_strm *addstr;
11915 
11916         ch = mtod(chk->data, struct sctp_chunkhdr *);
11917         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11918 
11919         /* get to new offset for the param. */
11920         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11921         /* now how long will this param be? */
11922         len = sizeof(struct sctp_stream_reset_add_strm);
11923         /* Fill it out. */
11924         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11925         addstr->ph.param_length = htons(len);
11926         addstr->request_seq = htonl(seq);
11927         addstr->number_of_streams = htons(adding);
11928         addstr->reserved = 0;
11929 
11930         /* now fix the chunk length */
11931         ch->chunk_length = htons(len + old_len);
11932         chk->send_size = len + old_len;
11933         chk->book_size = SCTP_SIZE32(chk->send_size);
11934         chk->book_size_scale = 0;
11935         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11936         return;
11937 }
11938 
11939 int
11940 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11941 {
11942         struct sctp_association *asoc;
11943         struct sctp_tmit_chunk *chk;
11944         struct sctp_chunkhdr *ch;
11945         uint32_t seq;
11946 
11947         asoc = &stcb->asoc;
11948         asoc->trigger_reset = 0;
11949         if (asoc->stream_reset_outstanding) {
11950                 return (EALREADY);
11951         }
11952         sctp_alloc_a_chunk(stcb, chk);
11953         if (chk == NULL) {
11954                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11955                 return (ENOMEM);
11956         }
11957         chk->copy_by_ref = 0;
11958         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11959         chk->rec.chunk_id.can_take_data = 0;
11960         chk->flags = 0;
11961         chk->asoc = &stcb->asoc;
11962         chk->book_size = sizeof(struct sctp_chunkhdr);
11963         chk->send_size = SCTP_SIZE32(chk->book_size);
11964         chk->book_size_scale = 0;
11965         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11966         if (chk->data == NULL) {
11967                 sctp_free_a_chunk(stcb, chk, so_locked);
11968                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11969                 return (ENOMEM);
11970         }
11971         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11972 
11973         /* setup chunk parameters */
11974         chk->sent = SCTP_DATAGRAM_UNSENT;
11975         chk->snd_count = 0;
11976         if (stcb->asoc.alternate) {
11977                 chk->whoTo = stcb->asoc.alternate;
11978         } else {
11979                 chk->whoTo = stcb->asoc.primary_destination;
11980         }
11981         ch = mtod(chk->data, struct sctp_chunkhdr *);
11982         ch->chunk_type = SCTP_STREAM_RESET;
11983         ch->chunk_flags = 0;
11984         ch->chunk_length = htons(chk->book_size);
11985         atomic_add_int(&chk->whoTo->ref_count, 1);
11986         SCTP_BUF_LEN(chk->data) = chk->send_size;
11987         seq = stcb->asoc.str_reset_seq_out;
11988         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11989                 seq++;
11990                 asoc->stream_reset_outstanding++;
11991         } else {
11992                 m_freem(chk->data);
11993                 chk->data = NULL;
11994                 sctp_free_a_chunk(stcb, chk, so_locked);
11995                 return (ENOENT);
11996         }
11997         asoc->str_reset = chk;
11998         /* insert the chunk for sending */
11999         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12000             chk,
12001             sctp_next);
12002         asoc->ctrl_queue_cnt++;
12003 
12004         if (stcb->asoc.send_sack) {
12005                 sctp_send_sack(stcb, so_locked);
12006         }
12007         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12008         return (0);
12009 }
12010 
12011 int
12012 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12013     uint16_t number_entries, uint16_t *list,
12014     uint8_t send_in_req,
12015     uint8_t send_tsn_req,
12016     uint8_t add_stream,
12017     uint16_t adding_o,
12018     uint16_t adding_i, uint8_t peer_asked)
12019 {
12020         struct sctp_association *asoc;
12021         struct sctp_tmit_chunk *chk;
12022         struct sctp_chunkhdr *ch;
12023         int can_send_out_req = 0;
12024         uint32_t seq;
12025 
12026         SCTP_TCB_LOCK_ASSERT(stcb);
12027 
12028         asoc = &stcb->asoc;
12029         if (asoc->stream_reset_outstanding) {
12030                 /*-
12031                  * Already one pending, must get ACK back to clear the flag.
12032                  */
12033                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12034                 return (EBUSY);
12035         }
12036         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12037             (add_stream == 0)) {
12038                 /* nothing to do */
12039                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12040                 return (EINVAL);
12041         }
12042         if (send_tsn_req && send_in_req) {
12043                 /* error, can't do that */
12044                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12045                 return (EINVAL);
12046         } else if (send_in_req) {
12047                 can_send_out_req = 1;
12048         }
12049         if (number_entries > (MCLBYTES -
12050             SCTP_MIN_OVERHEAD -
12051             sizeof(struct sctp_chunkhdr) -
12052             sizeof(struct sctp_stream_reset_out_request)) /
12053             sizeof(uint16_t)) {
12054                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12055                 return (ENOMEM);
12056         }
12057         sctp_alloc_a_chunk(stcb, chk);
12058         if (chk == NULL) {
12059                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12060                 return (ENOMEM);
12061         }
12062         chk->copy_by_ref = 0;
12063         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12064         chk->rec.chunk_id.can_take_data = 0;
12065         chk->flags = 0;
12066         chk->asoc = &stcb->asoc;
12067         chk->book_size = sizeof(struct sctp_chunkhdr);
12068         chk->send_size = SCTP_SIZE32(chk->book_size);
12069         chk->book_size_scale = 0;
12070         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12071         if (chk->data == NULL) {
12072                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12073                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12074                 return (ENOMEM);
12075         }
12076         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12077 
12078         /* setup chunk parameters */
12079         chk->sent = SCTP_DATAGRAM_UNSENT;
12080         chk->snd_count = 0;
12081         if (stcb->asoc.alternate) {
12082                 chk->whoTo = stcb->asoc.alternate;
12083         } else {
12084                 chk->whoTo = stcb->asoc.primary_destination;
12085         }
12086         atomic_add_int(&chk->whoTo->ref_count, 1);
12087         ch = mtod(chk->data, struct sctp_chunkhdr *);
12088         ch->chunk_type = SCTP_STREAM_RESET;
12089         ch->chunk_flags = 0;
12090         ch->chunk_length = htons(chk->book_size);
12091         SCTP_BUF_LEN(chk->data) = chk->send_size;
12092 
12093         seq = stcb->asoc.str_reset_seq_out;
12094         if (can_send_out_req) {
12095                 int ret;
12096 
12097                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12098                 if (ret) {
12099                         seq++;
12100                         asoc->stream_reset_outstanding++;
12101                 }
12102         }
12103         if ((add_stream & 1) &&
12104             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12105                 /* Need to allocate more */
12106                 struct sctp_stream_out *oldstream;
12107                 struct sctp_stream_queue_pending *sp, *nsp;
12108                 int i;
12109 #if defined(SCTP_DETAILED_STR_STATS)
12110                 int j;
12111 #endif
12112 
12113                 oldstream = stcb->asoc.strmout;
12114                 /* get some more */
12115                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12116                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12117                     SCTP_M_STRMO);
12118                 if (stcb->asoc.strmout == NULL) {
12119                         uint8_t x;
12120 
12121                         stcb->asoc.strmout = oldstream;
12122                         /* Turn off the bit */
12123                         x = add_stream & 0xfe;
12124                         add_stream = x;
12125                         goto skip_stuff;
12126                 }
12127                 /*
12128                  * Ok now we proceed with copying the old out stuff and
12129                  * initializing the new stuff.
12130                  */
12131                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, false);
12132                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12133                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12134                         /* FIX ME FIX ME */
12135                         /*
12136                          * This should be a SS_COPY operation FIX ME STREAM
12137                          * SCHEDULER EXPERT
12138                          */
12139                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], &oldstream[i]);
12140                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12141 #if defined(SCTP_DETAILED_STR_STATS)
12142                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12143                                 stcb->asoc.strmout[i].abandoned_sent[j] = oldstream[i].abandoned_sent[j];
12144                                 stcb->asoc.strmout[i].abandoned_unsent[j] = oldstream[i].abandoned_unsent[j];
12145                         }
12146 #else
12147                         stcb->asoc.strmout[i].abandoned_sent[0] = oldstream[i].abandoned_sent[0];
12148                         stcb->asoc.strmout[i].abandoned_unsent[0] = oldstream[i].abandoned_unsent[0];
12149 #endif
12150                         stcb->asoc.strmout[i].next_mid_ordered = oldstream[i].next_mid_ordered;
12151                         stcb->asoc.strmout[i].next_mid_unordered = oldstream[i].next_mid_unordered;
12152                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12153                         stcb->asoc.strmout[i].sid = i;
12154                         stcb->asoc.strmout[i].state = oldstream[i].state;
12155                         /* now anything on those queues? */
12156                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12157                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12158                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12159                         }
12160                 }
12161                 /* now the new streams */
12162                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc);
12163                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12164                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12165                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12166 #if defined(SCTP_DETAILED_STR_STATS)
12167                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12168                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12169                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12170                         }
12171 #else
12172                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12173                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12174 #endif
12175                         stcb->asoc.strmout[i].next_mid_ordered = 0;
12176                         stcb->asoc.strmout[i].next_mid_unordered = 0;
12177                         stcb->asoc.strmout[i].sid = i;
12178                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12179                         stcb->asoc.ss_functions.sctp_ss_init_stream(stcb, &stcb->asoc.strmout[i], NULL);
12180                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12181                 }
12182                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12183                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12184         }
12185 skip_stuff:
12186         if ((add_stream & 1) && (adding_o > 0)) {
12187                 asoc->strm_pending_add_size = adding_o;
12188                 asoc->peer_req_out = peer_asked;
12189                 sctp_add_an_out_stream(chk, seq, adding_o);
12190                 seq++;
12191                 asoc->stream_reset_outstanding++;
12192         }
12193         if ((add_stream & 2) && (adding_i > 0)) {
12194                 sctp_add_an_in_stream(chk, seq, adding_i);
12195                 seq++;
12196                 asoc->stream_reset_outstanding++;
12197         }
12198         if (send_in_req) {
12199                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12200                 seq++;
12201                 asoc->stream_reset_outstanding++;
12202         }
12203         if (send_tsn_req) {
12204                 sctp_add_stream_reset_tsn(chk, seq);
12205                 asoc->stream_reset_outstanding++;
12206         }
12207         asoc->str_reset = chk;
12208         /* insert the chunk for sending */
12209         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12210             chk,
12211             sctp_next);
12212         asoc->ctrl_queue_cnt++;
12213         if (stcb->asoc.send_sack) {
12214                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12215         }
12216         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12217         return (0);
12218 }
12219 
12220 void
12221 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12222     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12223     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12224     uint32_t vrf_id, uint16_t port)
12225 {
12226         /* Don't respond to an ABORT with an ABORT. */
12227         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12228                 if (cause)
12229                         sctp_m_freem(cause);
12230                 return;
12231         }
12232         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12233             mflowtype, mflowid, fibnum,
12234             vrf_id, port);
12235         return;
12236 }
12237 
12238 void
12239 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12240     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12241     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12242     uint32_t vrf_id, uint16_t port)
12243 {
12244         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12245             mflowtype, mflowid, fibnum,
12246             vrf_id, port);
12247         return;
12248 }
12249 
12250 static struct mbuf *
12251 sctp_copy_resume(struct uio *uio,
12252     int max_send_len,
12253     int user_marks_eor,
12254     int *error,
12255     uint32_t *sndout,
12256     struct mbuf **new_tail)
12257 {
12258         struct mbuf *m;
12259 
12260         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12261             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12262         if (m == NULL) {
12263                 /* The only possible error is EFAULT. */
12264                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12265                 *error = EFAULT;
12266         } else {
12267                 *sndout = m_length(m, NULL);
12268                 *new_tail = m_last(m);
12269         }
12270         return (m);
12271 }
12272 
12273 static int
12274 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12275     struct uio *uio,
12276     int resv_upfront)
12277 {
12278         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length, resv_upfront, 0);
12279         if (sp->data == NULL) {
12280                 /* The only possible error is EFAULT. */
12281                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12282                 return (EFAULT);
12283         }
12284         sp->tail_mbuf = m_last(sp->data);
12285         return (0);
12286 }
12287 
12288 static struct sctp_stream_queue_pending *
12289 sctp_copy_it_in(struct sctp_tcb *stcb,
12290     struct sctp_association *asoc,
12291     struct sctp_nonpad_sndrcvinfo *srcv,
12292     struct uio *uio,
12293     struct sctp_nets *net,
12294     ssize_t max_send_len,
12295     int user_marks_eor,
12296     int *error)
12297 {
12298 
12299         /*-
12300          * This routine must be very careful in its work. Protocol
12301          * processing is up and running so care must be taken to spl...()
12302          * when you need to do something that may effect the stcb/asoc. The
12303          * sb is locked however. When data is copied the protocol processing
12304          * should be enabled since this is a slower operation...
12305          */
12306         struct sctp_stream_queue_pending *sp;
12307         int resv_in_first;
12308 
12309         *error = 0;
12310         sctp_alloc_a_strmoq(stcb, sp);
12311         if (sp == NULL) {
12312                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12313                 *error = ENOMEM;
12314                 goto out_now;
12315         }
12316         sp->act_flags = 0;
12317         sp->sender_all_done = 0;
12318         sp->sinfo_flags = srcv->sinfo_flags;
12319         sp->timetolive = srcv->sinfo_timetolive;
12320         sp->ppid = srcv->sinfo_ppid;
12321         sp->context = srcv->sinfo_context;
12322         sp->fsn = 0;
12323         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12324         sp->sid = srcv->sinfo_stream;
12325         sp->length = (uint32_t)min(uio->uio_resid, max_send_len);
12326         if ((sp->length == (uint32_t)uio->uio_resid) &&
12327             ((user_marks_eor == 0) ||
12328             (srcv->sinfo_flags & SCTP_EOF) ||
12329             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12330                 sp->msg_is_complete = 1;
12331         } else {
12332                 sp->msg_is_complete = 0;
12333         }
12334         sp->sender_all_done = 0;
12335         sp->some_taken = 0;
12336         sp->put_last_out = 0;
12337         resv_in_first = SCTP_DATA_CHUNK_OVERHEAD(stcb);
12338         sp->data = sp->tail_mbuf = NULL;
12339         if (sp->length == 0) {
12340                 goto skip_copy;
12341         }
12342         if (srcv->sinfo_keynumber_valid) {
12343                 sp->auth_keyid = srcv->sinfo_keynumber;
12344         } else {
12345                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12346         }
12347         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12348                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12349                 sp->holds_key_ref = 1;
12350         }
12351         *error = sctp_copy_one(sp, uio, resv_in_first);
12352 skip_copy:
12353         if (*error) {
12354                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12355                 sp = NULL;
12356         } else {
12357                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12358                         sp->net = net;
12359                         atomic_add_int(&sp->net->ref_count, 1);
12360                 } else {
12361                         sp->net = NULL;
12362                 }
12363                 sctp_set_prsctp_policy(sp);
12364         }
12365 out_now:
12366         return (sp);
12367 }
12368 
12369 int
12370 sctp_sosend(struct socket *so,
12371     struct sockaddr *addr,
12372     struct uio *uio,
12373     struct mbuf *top,
12374     struct mbuf *control,
12375     int flags,
12376     struct thread *p)
12377 {
12378         struct sctp_sndrcvinfo sndrcvninfo;
12379 #if defined(INET) && defined(INET6)
12380         struct sockaddr_in sin;
12381 #endif
12382         struct sockaddr *addr_to_use;
12383         int error;
12384         bool use_sndinfo;
12385 
12386         if (control != NULL) {
12387                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12388                 use_sndinfo = sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control, sizeof(sndrcvninfo));
12389         } else {
12390                 use_sndinfo = false;
12391         }
12392 #if defined(INET) && defined(INET6)
12393         if ((addr != NULL) && (addr->sa_family == AF_INET6)) {
12394                 struct sockaddr_in6 *sin6;
12395 
12396                 if (addr->sa_len != sizeof(struct sockaddr_in6)) {
12397                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12398                         return (EINVAL);
12399                 }
12400                 sin6 = (struct sockaddr_in6 *)addr;
12401                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12402                         in6_sin6_2_sin(&sin, sin6);
12403                         addr_to_use = (struct sockaddr *)&sin;
12404                 } else {
12405                         addr_to_use = addr;
12406                 }
12407         } else {
12408                 addr_to_use = addr;
12409         }
12410 #else
12411         addr_to_use = addr;
12412 #endif
12413         error = sctp_lower_sosend(so, addr_to_use, uio, top, control, flags,
12414             use_sndinfo ? &sndrcvninfo : NULL, p);
12415         return (error);
12416 }
12417 
12418 int
12419 sctp_lower_sosend(struct socket *so,
12420     struct sockaddr *addr,
12421     struct uio *uio,
12422     struct mbuf *top,
12423     struct mbuf *control,
12424     int flags,
12425     struct sctp_sndrcvinfo *srcv,
12426     struct thread *p)
12427 {
12428         struct sctp_nonpad_sndrcvinfo sndrcvninfo_buf;
12429         struct epoch_tracker et;
12430         struct timeval now;
12431         struct sctp_block_entry be;
12432         struct sctp_inpcb *inp;
12433         struct sctp_tcb *stcb = NULL;
12434         struct sctp_nets *net;
12435         struct sctp_association *asoc;
12436         struct sctp_inpcb *t_inp;
12437         struct sctp_nonpad_sndrcvinfo *sndrcvninfo;
12438         ssize_t sndlen = 0, max_len, local_add_more;
12439         ssize_t local_soresv = 0;
12440         sctp_assoc_t sinfo_assoc_id;
12441         int user_marks_eor;
12442         int nagle_applies = 0;
12443         int error;
12444         int queue_only = 0, queue_only_for_init = 0;
12445         int un_sent;
12446         int now_filled = 0;
12447         unsigned int inqueue_bytes = 0;
12448         uint16_t port;
12449         uint16_t sinfo_flags;
12450         uint16_t sinfo_stream;
12451         bool create_lock_applied = false;
12452         bool free_cnt_applied = false;
12453         bool some_on_control;
12454         bool got_all_of_the_send = false;
12455         bool non_blocking = false;
12456 
12457         error = 0;
12458         net = NULL;
12459         stcb = NULL;
12460 
12461         if ((uio == NULL) && (top == NULL)) {
12462                 error = EINVAL;
12463                 goto out_unlocked;
12464         }
12465         if (addr != NULL) {
12466                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12467 
12468                 switch (raddr->sa.sa_family) {
12469 #ifdef INET
12470                 case AF_INET:
12471                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12472                                 error = EINVAL;
12473                                 goto out_unlocked;
12474                         }
12475                         port = raddr->sin.sin_port;
12476                         break;
12477 #endif
12478 #ifdef INET6
12479                 case AF_INET6:
12480                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12481                                 error = EINVAL;
12482                                 goto out_unlocked;
12483                         }
12484                         port = raddr->sin6.sin6_port;
12485                         break;
12486 #endif
12487                 default:
12488                         error = EAFNOSUPPORT;
12489                         goto out_unlocked;
12490                 }
12491         } else {
12492                 port = 0;
12493         }
12494         if (uio != NULL) {
12495                 if (uio->uio_resid < 0) {
12496                         error = EINVAL;
12497                         goto out_unlocked;
12498                 }
12499                 sndlen = uio->uio_resid;
12500         } else {
12501                 sndlen = SCTP_HEADER_LEN(top);
12502         }
12503         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %zd\n",
12504             (void *)addr, sndlen);
12505 
12506         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12507         if (inp == NULL) {
12508                 error = EINVAL;
12509                 goto out_unlocked;
12510         }
12511         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12512         if ((uio == NULL) && (user_marks_eor != 0)) {
12513                 /*-
12514                  * We do not support eeor mode for
12515                  * sending with mbuf chains (like sendfile).
12516                  */
12517                 error = EINVAL;
12518                 goto out_unlocked;
12519         }
12520         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12521             SCTP_IS_LISTENING(inp)) {
12522                 /* The listener can NOT send. */
12523                 error = EINVAL;
12524                 goto out_unlocked;
12525         }
12526         atomic_add_int(&inp->total_sends, 1);
12527 
12528         if (srcv != NULL) {
12529                 sndrcvninfo = (struct sctp_nonpad_sndrcvinfo *)srcv;
12530                 sinfo_assoc_id = sndrcvninfo->sinfo_assoc_id;
12531                 sinfo_flags = sndrcvninfo->sinfo_flags;
12532                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12533                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12534                         error = EINVAL;
12535                         goto out_unlocked;
12536                 }
12537                 if (sinfo_flags != 0) {
12538                         SCTP_STAT_INCR(sctps_sends_with_flags);
12539                 }
12540         } else {
12541                 sndrcvninfo = NULL;
12542                 sinfo_flags = inp->def_send.sinfo_flags;
12543                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12544         }
12545         if (flags & MSG_EOR) {
12546                 sinfo_flags |= SCTP_EOR;
12547         }
12548         if (flags & MSG_EOF) {
12549                 sinfo_flags |= SCTP_EOF;
12550         }
12551         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12552                 error = EINVAL;
12553                 goto out_unlocked;
12554         }
12555         SCTP_INP_RLOCK(inp);
12556         if ((sinfo_flags & SCTP_SENDALL) &&
12557             (inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) {
12558                 SCTP_INP_RUNLOCK(inp);
12559                 error = sctp_sendall(inp, uio, top, sndrcvninfo);
12560                 top = NULL;
12561                 goto out_unlocked;
12562         }
12563         /* Now we must find the association. */
12564         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12565             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12566                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12567                 if (stcb != NULL) {
12568                         SCTP_TCB_LOCK(stcb);
12569                 }
12570                 SCTP_INP_RUNLOCK(inp);
12571         } else if (sinfo_assoc_id > SCTP_ALL_ASSOC) {
12572                 stcb = sctp_findasoc_ep_asocid_locked(inp, sinfo_assoc_id, 1);
12573                 SCTP_INP_RUNLOCK(inp);
12574                 if (stcb != NULL) {
12575                         SCTP_TCB_LOCK_ASSERT(stcb);
12576                 }
12577         } else if (addr != NULL) {
12578                 /*-
12579                  * Since we did not use findep we must
12580                  * increment it, and if we don't find a tcb
12581                  * decrement it.
12582                  */
12583                 SCTP_INP_INCR_REF(inp);
12584                 SCTP_INP_RUNLOCK(inp);
12585                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12586                 if (stcb == NULL) {
12587                         SCTP_INP_WLOCK(inp);
12588                         SCTP_INP_DECR_REF(inp);
12589                         SCTP_INP_WUNLOCK(inp);
12590                 } else {
12591                         SCTP_TCB_LOCK_ASSERT(stcb);
12592                 }
12593         } else {
12594                 SCTP_INP_RUNLOCK(inp);
12595         }
12596 
12597 #ifdef INVARIANTS
12598         if (stcb != NULL) {
12599                 SCTP_TCB_LOCK_ASSERT(stcb);
12600         }
12601 #endif
12602 
12603         if ((stcb == NULL) && (addr != NULL)) {
12604                 /* Possible implicit send? */
12605                 SCTP_ASOC_CREATE_LOCK(inp);
12606                 create_lock_applied = true;
12607                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12608                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12609                         error = EINVAL;
12610                         goto out_unlocked;
12611                 }
12612                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12613                     (addr->sa_family == AF_INET6)) {
12614                         error = EINVAL;
12615                         goto out_unlocked;
12616                 }
12617                 SCTP_INP_WLOCK(inp);
12618                 SCTP_INP_INCR_REF(inp);
12619                 SCTP_INP_WUNLOCK(inp);
12620                 /* With the lock applied look again */
12621                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12622 #if defined(INET) || defined(INET6)
12623                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12624                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12625                 }
12626 #endif
12627                 if (stcb == NULL) {
12628                         SCTP_INP_WLOCK(inp);
12629                         SCTP_INP_DECR_REF(inp);
12630                         SCTP_INP_WUNLOCK(inp);
12631                 } else {
12632                         SCTP_TCB_LOCK_ASSERT(stcb);
12633                         SCTP_ASOC_CREATE_UNLOCK(inp);
12634                         create_lock_applied = false;
12635                 }
12636                 if (error != 0) {
12637                         goto out_unlocked;
12638                 }
12639                 if (t_inp != inp) {
12640                         error = ENOTCONN;
12641                         goto out_unlocked;
12642                 }
12643         }
12644         if (stcb == NULL) {
12645                 if (addr == NULL) {
12646                         error = ENOENT;
12647                         goto out_unlocked;
12648                 } else {
12649                         /* We must go ahead and start the INIT process */
12650                         uint32_t vrf_id;
12651 
12652                         if ((sinfo_flags & SCTP_ABORT) ||
12653                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12654                                 /*-
12655                                  * User asks to abort a non-existent assoc,
12656                                  * or EOF a non-existent assoc with no data
12657                                  */
12658                                 error = ENOENT;
12659                                 goto out_unlocked;
12660                         }
12661                         /* get an asoc/stcb struct */
12662                         vrf_id = inp->def_vrf_id;
12663                         KASSERT(create_lock_applied, ("create_lock_applied is false"));
12664                         stcb = sctp_aloc_assoc_connected(inp, addr, &error, 0, 0, vrf_id,
12665                             inp->sctp_ep.pre_open_stream_count,
12666                             inp->sctp_ep.port,
12667                             p,
12668                             SCTP_INITIALIZE_AUTH_PARAMS);
12669                         if (stcb == NULL) {
12670                                 /* error is setup for us in the call. */
12671                                 KASSERT(error != 0, ("error is 0 although stcb is NULL"));
12672                                 goto out_unlocked;
12673                         }
12674                         SCTP_TCB_LOCK_ASSERT(stcb);
12675                         SCTP_ASOC_CREATE_UNLOCK(inp);
12676                         create_lock_applied = false;
12677                         /*
12678                          * Turn on queue only flag to prevent data from
12679                          * being sent
12680                          */
12681                         queue_only = 1;
12682                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
12683                         (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
12684                         if (control != NULL) {
12685                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12686                                         sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
12687                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
12688                                         stcb = NULL;
12689                                         KASSERT(error != 0,
12690                                             ("error is 0 although sctp_process_cmsgs_for_init() indicated an error"));
12691                                         goto out_unlocked;
12692                                 }
12693                         }
12694                         /* out with the INIT */
12695                         queue_only_for_init = 1;
12696                         /*-
12697                          * we may want to dig in after this call and adjust the MTU
12698                          * value. It defaulted to 1500 (constant) but the ro
12699                          * structure may now have an update and thus we may need to
12700                          * change it BEFORE we append the message.
12701                          */
12702                 }
12703         }
12704 
12705         KASSERT(!create_lock_applied, ("create_lock_applied is true"));
12706         KASSERT(stcb != NULL, ("stcb is NULL"));
12707         SCTP_TCB_LOCK_ASSERT(stcb);
12708 
12709         asoc = &stcb->asoc;
12710         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12711             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12712                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12713                         /* XXX: Could also be ECONNABORTED, not enough info. */
12714                         error = ECONNRESET;
12715                 } else {
12716                         error = ENOTCONN;
12717                 }
12718                 goto out_unlocked;
12719         }
12720         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12721             (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12722                 queue_only = 1;
12723         }
12724         /* Keep the stcb from being freed under our feet. */
12725         atomic_add_int(&asoc->refcnt, 1);
12726         free_cnt_applied = true;
12727         if (sndrcvninfo == NULL) {
12728                 /* Use a local copy to have a consistent view. */
12729                 sndrcvninfo_buf = asoc->def_send;
12730                 sndrcvninfo = &sndrcvninfo_buf;
12731                 sinfo_flags = sndrcvninfo->sinfo_flags;
12732                 if (flags & MSG_EOR) {
12733                         sinfo_flags |= SCTP_EOR;
12734                 }
12735                 if (flags & MSG_EOF) {
12736                         sinfo_flags |= SCTP_EOF;
12737                 }
12738         }
12739         /* Are we aborting? */
12740         if (sinfo_flags & SCTP_ABORT) {
12741                 struct mbuf *mm;
12742                 struct sctp_paramhdr *ph;
12743                 ssize_t tot_demand, tot_out = 0, max_out;
12744 
12745                 SCTP_STAT_INCR(sctps_sends_with_abort);
12746                 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
12747                     (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
12748                         /* It has to be up before we abort. */
12749                         error = EINVAL;
12750                         goto out_unlocked;
12751                 }
12752                 /* How big is the user initiated abort? */
12753                 if (top != NULL) {
12754                         struct mbuf *cntm;
12755 
12756                         if (sndlen != 0) {
12757                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12758                                         tot_out += SCTP_BUF_LEN(cntm);
12759                                 }
12760                         }
12761                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_NOWAIT, 1, MT_DATA);
12762                 } else {
12763                         /* Must fit in a MTU */
12764                         tot_out = sndlen;
12765                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12766                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12767                                 error = EMSGSIZE;
12768                                 goto out_unlocked;
12769                         }
12770                         mm = sctp_get_mbuf_for_msg((unsigned int)tot_demand, 0, M_NOWAIT, 1, MT_DATA);
12771                 }
12772                 if (mm == NULL) {
12773                         error = ENOMEM;
12774                         goto out_unlocked;
12775                 }
12776                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12777                 max_out -= sizeof(struct sctp_abort_msg);
12778                 if (tot_out > max_out) {
12779                         tot_out = max_out;
12780                 }
12781                 ph = mtod(mm, struct sctp_paramhdr *);
12782                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12783                 ph->param_length = htons((uint16_t)(sizeof(struct sctp_paramhdr) + tot_out));
12784                 ph++;
12785                 SCTP_BUF_LEN(mm) = (int)(tot_out + sizeof(struct sctp_paramhdr));
12786                 if (top == NULL) {
12787                         SCTP_TCB_UNLOCK(stcb);
12788                         error = uiomove((caddr_t)ph, (int)tot_out, uio);
12789                         SCTP_TCB_LOCK(stcb);
12790                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12791                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12792                                 sctp_m_freem(mm);
12793                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12794                                         /*
12795                                          * XXX: Could also be ECONNABORTED,
12796                                          * not enough info.
12797                                          */
12798                                         error = ECONNRESET;
12799                                 } else {
12800                                         error = ENOTCONN;
12801                                 }
12802                                 goto out_unlocked;
12803                         }
12804                         if (error != 0) {
12805                                 /*-
12806                                  * Here if we can't get his data we
12807                                  * still abort we just don't get to
12808                                  * send the users note :-0
12809                                  */
12810                                 sctp_m_freem(mm);
12811                                 mm = NULL;
12812                                 error = 0;
12813                         }
12814                 } else {
12815                         if (sndlen != 0) {
12816                                 SCTP_BUF_NEXT(mm) = top;
12817                         }
12818                 }
12819                 atomic_subtract_int(&asoc->refcnt, 1);
12820                 free_cnt_applied = false;
12821                 /* release this lock, otherwise we hang on ourselves */
12822                 NET_EPOCH_ENTER(et);
12823                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, false, SCTP_SO_LOCKED);
12824                 NET_EPOCH_EXIT(et);
12825                 stcb = NULL;
12826                 /*
12827                  * In this case top is already chained to mm avoid double
12828                  * free, since we free it below if top != NULL and driver
12829                  * would free it after sending the packet out
12830                  */
12831                 if (sndlen != 0) {
12832                         top = NULL;
12833                 }
12834                 goto out_unlocked;
12835         }
12836 
12837         KASSERT(stcb != NULL, ("stcb is NULL"));
12838         SCTP_TCB_LOCK_ASSERT(stcb);
12839         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12840             ("Association about to be freed"));
12841         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12842             ("Association was aborted"));
12843 
12844         if (sinfo_flags & SCTP_ADDR_OVER) {
12845                 if (addr != NULL) {
12846                         net = sctp_findnet(stcb, addr);
12847                 } else {
12848                         net = NULL;
12849                 }
12850                 if ((net == NULL) ||
12851                     ((port != 0) && (port != stcb->rport))) {
12852                         error = EINVAL;
12853                         goto out_unlocked;
12854                 }
12855         } else {
12856                 if (asoc->alternate != NULL) {
12857                         net = asoc->alternate;
12858                 } else {
12859                         net = asoc->primary_destination;
12860                 }
12861         }
12862         if (sndlen == 0) {
12863                 if (sinfo_flags & SCTP_EOF) {
12864                         got_all_of_the_send = true;
12865                         goto dataless_eof;
12866                 } else {
12867                         error = EINVAL;
12868                         goto out_unlocked;
12869                 }
12870         }
12871         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12872                 if (sndlen > (ssize_t)asoc->smallest_mtu) {
12873                         error = EMSGSIZE;
12874                         goto out_unlocked;
12875                 }
12876         }
12877         sinfo_stream = sndrcvninfo->sinfo_stream;
12878         /* Is the stream no. valid? */
12879         if (sinfo_stream >= asoc->streamoutcnt) {
12880                 /* Invalid stream number */
12881                 error = EINVAL;
12882                 goto out_unlocked;
12883         }
12884         if ((asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPEN) &&
12885             (asoc->strmout[sinfo_stream].state != SCTP_STREAM_OPENING)) {
12886                 /*
12887                  * Can't queue any data while stream reset is underway.
12888                  */
12889                 if (asoc->strmout[sinfo_stream].state > SCTP_STREAM_OPEN) {
12890                         error = EAGAIN;
12891                 } else {
12892                         error = EINVAL;
12893                 }
12894                 goto out_unlocked;
12895         }
12896         atomic_add_int(&stcb->total_sends, 1);
12897         if (SCTP_SO_IS_NBIO(so) || (flags & (MSG_NBIO | MSG_DONTWAIT)) != 0) {
12898                 non_blocking = true;
12899         }
12900         if (non_blocking) {
12901                 ssize_t amount;
12902 
12903                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12904                 if (user_marks_eor == 0) {
12905                         amount = sndlen;
12906                 } else {
12907                         amount = 1;
12908                 }
12909                 if ((SCTP_SB_LIMIT_SND(so) < (amount + inqueue_bytes + asoc->sb_send_resv)) ||
12910                     (asoc->chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12911                         if ((sndlen > (ssize_t)SCTP_SB_LIMIT_SND(so)) &&
12912                             (user_marks_eor == 0)) {
12913                                 error = EMSGSIZE;
12914                         } else {
12915                                 error = EWOULDBLOCK;
12916                         }
12917                         goto out_unlocked;
12918                 }
12919         }
12920         atomic_add_int(&asoc->sb_send_resv, (int)sndlen);
12921         local_soresv = sndlen;
12922 
12923         KASSERT(stcb != NULL, ("stcb is NULL"));
12924         SCTP_TCB_LOCK_ASSERT(stcb);
12925         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
12926             ("Association about to be freed"));
12927         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
12928             ("Association was aborted"));
12929 
12930         /* Ok, we will attempt a msgsnd :> */
12931         if (p != NULL) {
12932                 p->td_ru.ru_msgsnd++;
12933         }
12934         /* Calculate the maximum we can send */
12935         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12936         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12937                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12938         } else {
12939                 max_len = 0;
12940         }
12941         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12942         if ((user_marks_eor == 0) &&
12943             (sndlen > (ssize_t)SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12944                 /* It will NEVER fit. */
12945                 error = EMSGSIZE;
12946                 goto out_unlocked;
12947         }
12948         if (user_marks_eor != 0) {
12949                 local_add_more = (ssize_t)min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12950         } else {
12951                 /*-
12952                  * For non-eeor the whole message must fit in
12953                  * the socket send buffer.
12954                  */
12955                 local_add_more = sndlen;
12956         }
12957         if (non_blocking) {
12958                 goto skip_preblock;
12959         }
12960         if (((max_len <= local_add_more) && ((ssize_t)SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12961             (max_len == 0) ||
12962             ((asoc->chunks_on_out_queue + asoc->stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12963                 /* No room right now! */
12964                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
12965                 SOCKBUF_LOCK(&so->so_snd);
12966                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12967                     ((asoc->stream_queue_cnt + asoc->chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12968                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %zd) || (%d+%d > %d)\n",
12969                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12970                             inqueue_bytes,
12971                             local_add_more,
12972                             asoc->stream_queue_cnt,
12973                             asoc->chunks_on_out_queue,
12974                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12975                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12976                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
12977                         }
12978                         be.error = 0;
12979                         stcb->block_entry = &be;
12980                         SCTP_TCB_UNLOCK(stcb);
12981                         error = sbwait(so, SO_SND);
12982                         if (error == 0) {
12983                                 if (so->so_error != 0) {
12984                                         error = so->so_error;
12985                                 }
12986                                 if (be.error != 0) {
12987                                         error = be.error;
12988                                 }
12989                         }
12990                         SOCKBUF_UNLOCK(&so->so_snd);
12991                         SCTP_TCB_LOCK(stcb);
12992                         stcb->block_entry = NULL;
12993                         if (error != 0) {
12994                                 goto out_unlocked;
12995                         }
12996                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
12997                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
12998                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
12999                                         /*
13000                                          * XXX: Could also be ECONNABORTED,
13001                                          * not enough info.
13002                                          */
13003                                         error = ECONNRESET;
13004                                 } else {
13005                                         error = ENOTCONN;
13006                                 }
13007                                 goto out_unlocked;
13008                         }
13009                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13010                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13011                                     asoc, asoc->total_output_queue_size);
13012                         }
13013                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13014                         SOCKBUF_LOCK(&so->so_snd);
13015                 }
13016                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13017                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13018                 } else {
13019                         max_len = 0;
13020                 }
13021                 SOCKBUF_UNLOCK(&so->so_snd);
13022         }
13023 
13024 skip_preblock:
13025         KASSERT(stcb != NULL, ("stcb is NULL"));
13026         SCTP_TCB_LOCK_ASSERT(stcb);
13027         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13028             ("Association about to be freed"));
13029         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13030             ("Association was aborted"));
13031 
13032         /*
13033          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13034          * case NOTE: uio will be null when top/mbuf is passed
13035          */
13036         if (top == NULL) {
13037                 struct sctp_stream_queue_pending *sp;
13038                 struct sctp_stream_out *strm;
13039                 uint32_t sndout;
13040 
13041                 if ((asoc->stream_locked) &&
13042                     (asoc->stream_locked_on != sinfo_stream)) {
13043                         error = EINVAL;
13044                         goto out;
13045                 }
13046                 strm = &asoc->strmout[sinfo_stream];
13047                 if (strm->last_msg_incomplete == 0) {
13048         do_a_copy_in:
13049                         SCTP_TCB_UNLOCK(stcb);
13050                         sp = sctp_copy_it_in(stcb, asoc, sndrcvninfo, uio, net, max_len, user_marks_eor, &error);
13051                         SCTP_TCB_LOCK(stcb);
13052                         if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13053                             (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13054                                 if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13055                                         /*
13056                                          * XXX: Could also be ECONNABORTED,
13057                                          * not enough info.
13058                                          */
13059                                         error = ECONNRESET;
13060                                 } else {
13061                                         error = ENOTCONN;
13062                                 }
13063                                 goto out;
13064                         }
13065                         if (error != 0) {
13066                                 goto out;
13067                         }
13068                         /*
13069                          * Reject the sending of a new user message, if the
13070                          * association is about to be shut down.
13071                          */
13072                         if ((SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) ||
13073                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
13074                             (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
13075                             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
13076                                 if (sp->data != 0) {
13077                                         sctp_m_freem(sp->data);
13078                                         sp->data = NULL;
13079                                         sp->tail_mbuf = NULL;
13080                                         sp->length = 0;
13081                                 }
13082                                 if (sp->net != NULL) {
13083                                         sctp_free_remote_addr(sp->net);
13084                                         sp->net = NULL;
13085                                 }
13086                                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
13087                                 error = EPIPE;
13088                                 goto out_unlocked;
13089                         }
13090                         /* The out streams might be reallocated. */
13091                         strm = &asoc->strmout[sinfo_stream];
13092                         if (sp->msg_is_complete) {
13093                                 strm->last_msg_incomplete = 0;
13094                                 asoc->stream_locked = 0;
13095                         } else {
13096                                 /*
13097                                  * Just got locked to this guy in case of an
13098                                  * interrupt.
13099                                  */
13100                                 strm->last_msg_incomplete = 1;
13101                                 if (asoc->idata_supported == 0) {
13102                                         asoc->stream_locked = 1;
13103                                         asoc->stream_locked_on = sinfo_stream;
13104                                 }
13105                                 sp->sender_all_done = 0;
13106                         }
13107                         sctp_snd_sb_alloc(stcb, sp->length);
13108                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13109                         if (sinfo_flags & SCTP_UNORDERED) {
13110                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13111                         }
13112                         sp->processing = 1;
13113                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13114                         asoc->ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp);
13115                 } else {
13116                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13117                         if (sp == NULL) {
13118                                 /* ???? Huh ??? last msg is gone */
13119 #ifdef INVARIANTS
13120                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13121 #else
13122                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13123                                 strm->last_msg_incomplete = 0;
13124 #endif
13125                                 goto do_a_copy_in;
13126                         }
13127                         if (sp->processing != 0) {
13128                                 error = EINVAL;
13129                                 goto out;
13130                         } else {
13131                                 sp->processing = 1;
13132                         }
13133                 }
13134 
13135                 KASSERT(stcb != NULL, ("stcb is NULL"));
13136                 SCTP_TCB_LOCK_ASSERT(stcb);
13137                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13138                     ("Association about to be freed"));
13139                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13140                     ("Association was aborted"));
13141 
13142                 while (uio->uio_resid > 0) {
13143                         /* How much room do we have? */
13144                         struct mbuf *new_tail, *mm;
13145 
13146                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13147                         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13148                                 max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13149                         } else {
13150                                 max_len = 0;
13151                         }
13152                         if ((max_len > (ssize_t)SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13153                             ((max_len > 0) && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13154                             (uio->uio_resid <= max_len)) {
13155                                 SCTP_TCB_UNLOCK(stcb);
13156                                 sndout = 0;
13157                                 new_tail = NULL;
13158                                 mm = sctp_copy_resume(uio, (int)max_len, user_marks_eor, &error, &sndout, &new_tail);
13159                                 SCTP_TCB_LOCK(stcb);
13160                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13161                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13162                                         /*
13163                                          * We need to get out. Peer probably
13164                                          * aborted.
13165                                          */
13166                                         sctp_m_freem(mm);
13167                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13168                                                 /*
13169                                                  * XXX: Could also be
13170                                                  * ECONNABORTED, not enough
13171                                                  * info.
13172                                                  */
13173                                                 error = ECONNRESET;
13174                                         } else {
13175                                                 error = ENOTCONN;
13176                                         }
13177                                         goto out;
13178                                 }
13179                                 if ((mm == NULL) || (error != 0)) {
13180                                         if (mm != NULL) {
13181                                                 sctp_m_freem(mm);
13182                                         }
13183                                         if (sp != NULL) {
13184                                                 sp->processing = 0;
13185                                         }
13186                                         goto out;
13187                                 }
13188                                 /* Update the mbuf and count */
13189                                 if (sp->tail_mbuf != NULL) {
13190                                         /* Tack it to the end. */
13191                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13192                                 } else {
13193                                         /* A stolen mbuf. */
13194                                         sp->data = mm;
13195                                 }
13196                                 sp->tail_mbuf = new_tail;
13197                                 sctp_snd_sb_alloc(stcb, sndout);
13198                                 atomic_add_int(&sp->length, sndout);
13199                                 if (sinfo_flags & SCTP_SACK_IMMEDIATELY) {
13200                                         sp->sinfo_flags |= SCTP_SACK_IMMEDIATELY;
13201                                 }
13202 
13203                                 /* Did we reach EOR? */
13204                                 if ((uio->uio_resid == 0) &&
13205                                     ((user_marks_eor == 0) ||
13206                                     (sinfo_flags & SCTP_EOF) ||
13207                                     (user_marks_eor && (sinfo_flags & SCTP_EOR)))) {
13208                                         sp->msg_is_complete = 1;
13209                                 } else {
13210                                         sp->msg_is_complete = 0;
13211                                 }
13212                         }
13213 
13214                         KASSERT(stcb != NULL, ("stcb is NULL"));
13215                         SCTP_TCB_LOCK_ASSERT(stcb);
13216                         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13217                             ("Association about to be freed"));
13218                         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13219                             ("Association was aborted"));
13220 
13221                         if (uio->uio_resid == 0) {
13222                                 /* got it all? */
13223                                 continue;
13224                         }
13225                         /* PR-SCTP? */
13226                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13227                                 /*
13228                                  * This is ugly but we must assure locking
13229                                  * order
13230                                  */
13231                                 sctp_prune_prsctp(stcb, asoc, sndrcvninfo, (int)sndlen);
13232                                 inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13233                                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes)
13234                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13235                                 else
13236                                         max_len = 0;
13237                                 if (max_len > 0) {
13238                                         continue;
13239                                 }
13240                         }
13241                         /* wait for space now */
13242                         if (non_blocking) {
13243                                 /* Non-blocking io in place out */
13244                                 if (sp != NULL) {
13245                                         sp->processing = 0;
13246                                 }
13247                                 goto skip_out_eof;
13248                         }
13249                         /* What about the INIT, send it maybe */
13250                         if (queue_only_for_init) {
13251                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13252                                         /* a collision took us forward? */
13253                                         queue_only = 0;
13254                                 } else {
13255                                         NET_EPOCH_ENTER(et);
13256                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13257                                         NET_EPOCH_EXIT(et);
13258                                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13259                                         queue_only = 1;
13260                                 }
13261                         }
13262                         if ((net->flight_size > net->cwnd) &&
13263                             (asoc->sctp_cmt_on_off == 0)) {
13264                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13265                                 queue_only = 1;
13266                         } else if (asoc->ifp_had_enobuf) {
13267                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13268                                 if (net->flight_size > (2 * net->mtu)) {
13269                                         queue_only = 1;
13270                                 }
13271                                 asoc->ifp_had_enobuf = 0;
13272                         }
13273                         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13274                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13275                             (asoc->total_flight > 0) &&
13276                             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13277                             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13278                                 /*-
13279                                  * Ok, Nagle is set on and we have data outstanding.
13280                                  * Don't send anything and let SACKs drive out the
13281                                  * data unless we have a "full" segment to send.
13282                                  */
13283                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13284                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13285                                 }
13286                                 SCTP_STAT_INCR(sctps_naglequeued);
13287                                 nagle_applies = 1;
13288                         } else {
13289                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13290                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13291                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13292                                 }
13293                                 SCTP_STAT_INCR(sctps_naglesent);
13294                                 nagle_applies = 0;
13295                         }
13296                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13297                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13298                                     nagle_applies, un_sent);
13299                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13300                                     asoc->total_flight,
13301                                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13302                         }
13303                         if (queue_only_for_init) {
13304                                 queue_only_for_init = 0;
13305                         }
13306                         if ((queue_only == 0) && (nagle_applies == 0)) {
13307                                 /*-
13308                                  * need to start chunk output
13309                                  * before blocking.. note that if
13310                                  * a lock is already applied, then
13311                                  * the input via the net is happening
13312                                  * and I don't need to start output :-D
13313                                  */
13314                                 NET_EPOCH_ENTER(et);
13315                                 sctp_chunk_output(inp, stcb,
13316                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13317                                 NET_EPOCH_EXIT(et);
13318                         }
13319                         /*-
13320                          * This is a bit strange, but I think it will
13321                          * work. The total_output_queue_size is locked and
13322                          * protected by the TCB_LOCK, which we just released.
13323                          * There is a race that can occur between releasing it
13324                          * above, and me getting the socket lock, where sacks
13325                          * come in but we have not put the SB_WAIT on the
13326                          * so_snd buffer to get the wakeup. After the LOCK
13327                          * is applied the sack_processing will also need to
13328                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13329                          * once we have the socket buffer lock if we recheck the
13330                          * size we KNOW we will get to sleep safely with the
13331                          * wakeup flag in place.
13332                          */
13333                         inqueue_bytes = asoc->total_output_queue_size - (asoc->chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
13334                         SOCKBUF_LOCK(&so->so_snd);
13335                         if (SCTP_SB_LIMIT_SND(so) <= (inqueue_bytes +
13336                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13337                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13338                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13339                                             asoc, uio->uio_resid);
13340                                 }
13341                                 be.error = 0;
13342                                 stcb->block_entry = &be;
13343                                 SCTP_TCB_UNLOCK(stcb);
13344                                 error = sbwait(so, SO_SND);
13345                                 if (error == 0) {
13346                                         if (so->so_error != 0)
13347                                                 error = so->so_error;
13348                                         if (be.error != 0) {
13349                                                 error = be.error;
13350                                         }
13351                                 }
13352                                 SOCKBUF_UNLOCK(&so->so_snd);
13353                                 SCTP_TCB_LOCK(stcb);
13354                                 stcb->block_entry = NULL;
13355                                 if ((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
13356                                     (asoc->state & SCTP_STATE_WAS_ABORTED)) {
13357                                         if (asoc->state & SCTP_STATE_WAS_ABORTED) {
13358                                                 /*
13359                                                  * XXX: Could also be
13360                                                  * ECONNABORTED, not enough
13361                                                  * info.
13362                                                  */
13363                                                 error = ECONNRESET;
13364                                         } else {
13365                                                 error = ENOTCONN;
13366                                         }
13367                                         goto out_unlocked;
13368                                 }
13369                                 if (error != 0) {
13370                                         if (sp != NULL) {
13371                                                 sp->processing = 0;
13372                                         }
13373                                         goto out_unlocked;
13374                                 }
13375                         } else {
13376                                 SOCKBUF_UNLOCK(&so->so_snd);
13377                         }
13378                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13379                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13380                                     asoc, asoc->total_output_queue_size);
13381                         }
13382                 }
13383 
13384                 KASSERT(stcb != NULL, ("stcb is NULL"));
13385                 SCTP_TCB_LOCK_ASSERT(stcb);
13386                 KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13387                     ("Association about to be freed"));
13388                 KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13389                     ("Association was aborted"));
13390 
13391                 /* The out streams might be reallocated. */
13392                 strm = &asoc->strmout[sinfo_stream];
13393                 if (sp != NULL) {
13394                         if (sp->msg_is_complete == 0) {
13395                                 strm->last_msg_incomplete = 1;
13396                                 if (asoc->idata_supported == 0) {
13397                                         asoc->stream_locked = 1;
13398                                         asoc->stream_locked_on = sinfo_stream;
13399                                 }
13400                         } else {
13401                                 sp->sender_all_done = 1;
13402                                 strm->last_msg_incomplete = 0;
13403                                 asoc->stream_locked = 0;
13404                         }
13405                         sp->processing = 0;
13406                 } else {
13407                         SCTP_PRINTF("Huh no sp TSNH?\n");
13408                         strm->last_msg_incomplete = 0;
13409                         asoc->stream_locked = 0;
13410                 }
13411                 if (uio->uio_resid == 0) {
13412                         got_all_of_the_send = true;
13413                 }
13414         } else {
13415                 error = sctp_msg_append(stcb, net, top, sndrcvninfo);
13416                 top = NULL;
13417                 if ((sinfo_flags & SCTP_EOF) != 0) {
13418                         got_all_of_the_send = true;
13419                 }
13420         }
13421         if (error != 0) {
13422                 goto out;
13423         }
13424 
13425 dataless_eof:
13426         KASSERT(stcb != NULL, ("stcb is NULL"));
13427         SCTP_TCB_LOCK_ASSERT(stcb);
13428         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13429             ("Association about to be freed"));
13430         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13431             ("Association was aborted"));
13432 
13433         /* EOF thing ? */
13434         if ((sinfo_flags & SCTP_EOF) && got_all_of_the_send) {
13435                 SCTP_STAT_INCR(sctps_sends_with_eof);
13436                 error = 0;
13437                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13438                     TAILQ_EMPTY(&asoc->sent_queue) &&
13439                     sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED) == 0) {
13440                         if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13441                                 goto abort_anyway;
13442                         }
13443                         /* there is nothing queued to send, so I'm done... */
13444                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13445                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13446                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13447                                 struct sctp_nets *netp;
13448 
13449                                 /* only send SHUTDOWN the first time through */
13450                                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13451                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13452                                 }
13453                                 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT);
13454                                 sctp_stop_timers_for_shutdown(stcb);
13455                                 if (asoc->alternate != NULL) {
13456                                         netp = asoc->alternate;
13457                                 } else {
13458                                         netp = asoc->primary_destination;
13459                                 }
13460                                 sctp_send_shutdown(stcb, netp);
13461                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13462                                     netp);
13463                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13464                                     NULL);
13465                         }
13466                 } else {
13467                         /*-
13468                          * we still got (or just got) data to send, so set
13469                          * SHUTDOWN_PENDING
13470                          */
13471                         /*-
13472                          * XXX sockets draft says that SCTP_EOF should be
13473                          * sent with no data.  currently, we will allow user
13474                          * data to be sent first and move to
13475                          * SHUTDOWN-PENDING
13476                          */
13477                         if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
13478                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13479                             (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13480                                 if ((*asoc->ss_functions.sctp_ss_is_user_msgs_incomplete) (stcb, asoc)) {
13481                                         SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_PARTIAL_MSG_LEFT);
13482                                 }
13483                                 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_SHUTDOWN_PENDING);
13484                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13485                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13486                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13487                                         struct mbuf *op_err;
13488                                         char msg[SCTP_DIAG_INFO_LEN];
13489 
13490                         abort_anyway:
13491                                         if (free_cnt_applied) {
13492                                                 atomic_subtract_int(&asoc->refcnt, 1);
13493                                                 free_cnt_applied = false;
13494                                         }
13495                                         SCTP_SNPRINTF(msg, sizeof(msg),
13496                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13497                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13498                                             msg);
13499                                         NET_EPOCH_ENTER(et);
13500                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13501                                             op_err, false, SCTP_SO_LOCKED);
13502                                         NET_EPOCH_EXIT(et);
13503                                         stcb = NULL;
13504                                         error = ECONNABORTED;
13505                                         goto out;
13506                                 }
13507                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13508                                     NULL);
13509                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13510                         }
13511                 }
13512         }
13513 
13514 skip_out_eof:
13515         KASSERT(stcb != NULL, ("stcb is NULL"));
13516         SCTP_TCB_LOCK_ASSERT(stcb);
13517         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13518             ("Association about to be freed"));
13519         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13520             ("Association was aborted"));
13521 
13522         some_on_control = !TAILQ_EMPTY(&asoc->control_send_queue);
13523         if (queue_only_for_init) {
13524                 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
13525                         /* a collision took us forward? */
13526                         queue_only = 0;
13527                 } else {
13528                         NET_EPOCH_ENTER(et);
13529                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13530                         NET_EPOCH_EXIT(et);
13531                         SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
13532                         queue_only = 1;
13533                 }
13534         }
13535 
13536         KASSERT(stcb != NULL, ("stcb is NULL"));
13537         SCTP_TCB_LOCK_ASSERT(stcb);
13538         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13539             ("Association about to be freed"));
13540         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13541             ("Association was aborted"));
13542 
13543         if ((net->flight_size > net->cwnd) &&
13544             (asoc->sctp_cmt_on_off == 0)) {
13545                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13546                 queue_only = 1;
13547         } else if (asoc->ifp_had_enobuf) {
13548                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13549                 if (net->flight_size > (2 * net->mtu)) {
13550                         queue_only = 1;
13551                 }
13552                 asoc->ifp_had_enobuf = 0;
13553         }
13554         un_sent = asoc->total_output_queue_size - asoc->total_flight;
13555         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13556             (asoc->total_flight > 0) &&
13557             (asoc->stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13558             (un_sent < (int)(asoc->smallest_mtu - SCTP_MIN_OVERHEAD))) {
13559                 /*-
13560                  * Ok, Nagle is set on and we have data outstanding.
13561                  * Don't send anything and let SACKs drive out the
13562                  * data unless wen have a "full" segment to send.
13563                  */
13564                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13565                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13566                 }
13567                 SCTP_STAT_INCR(sctps_naglequeued);
13568                 nagle_applies = 1;
13569         } else {
13570                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13571                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13572                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13573                 }
13574                 SCTP_STAT_INCR(sctps_naglesent);
13575                 nagle_applies = 0;
13576         }
13577         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13578                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13579                     nagle_applies, un_sent);
13580                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, asoc->total_output_queue_size,
13581                     asoc->total_flight,
13582                     asoc->chunks_on_out_queue, asoc->total_flight_count);
13583         }
13584 
13585         KASSERT(stcb != NULL, ("stcb is NULL"));
13586         SCTP_TCB_LOCK_ASSERT(stcb);
13587         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13588             ("Association about to be freed"));
13589         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13590             ("Association was aborted"));
13591 
13592         NET_EPOCH_ENTER(et);
13593         if ((queue_only == 0) && (nagle_applies == 0) && (asoc->peers_rwnd && un_sent)) {
13594                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13595         } else if ((queue_only == 0) &&
13596                     (asoc->peers_rwnd == 0) &&
13597             (asoc->total_flight == 0)) {
13598                 /* We get to have a probe outstanding */
13599                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13600         } else if (some_on_control) {
13601                 int num_out, reason;
13602 
13603                 /* Here we do control only */
13604                 (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out,
13605                     &reason, 1, 1, &now, &now_filled,
13606                     sctp_get_frag_point(stcb),
13607                     SCTP_SO_LOCKED);
13608         }
13609         NET_EPOCH_EXIT(et);
13610         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13611             queue_only, asoc->peers_rwnd, un_sent,
13612             asoc->total_flight, asoc->chunks_on_out_queue,
13613             asoc->total_output_queue_size, error);
13614 
13615         KASSERT(stcb != NULL, ("stcb is NULL"));
13616         SCTP_TCB_LOCK_ASSERT(stcb);
13617         KASSERT((asoc->state & SCTP_STATE_ABOUT_TO_BE_FREED) == 0,
13618             ("Association about to be freed"));
13619         KASSERT((asoc->state & SCTP_STATE_WAS_ABORTED) == 0,
13620             ("Association was aborted"));
13621 
13622 out:
13623 out_unlocked:
13624         if (create_lock_applied) {
13625                 SCTP_ASOC_CREATE_UNLOCK(inp);
13626         }
13627         if (stcb != NULL) {
13628                 if (local_soresv) {
13629                         atomic_subtract_int(&asoc->sb_send_resv, (int)sndlen);
13630                 }
13631                 if (free_cnt_applied) {
13632                         atomic_subtract_int(&asoc->refcnt, 1);
13633                 }
13634                 SCTP_TCB_UNLOCK(stcb);
13635         }
13636         if (top != NULL) {
13637                 sctp_m_freem(top);
13638         }
13639         if (control != NULL) {
13640                 sctp_m_freem(control);
13641         }
13642         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
13643         return (error);
13644 }
13645 
13646 /*
13647  * generate an AUTHentication chunk, if required
13648  */
13649 struct mbuf *
13650 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13651     struct sctp_auth_chunk **auth_ret, uint32_t *offset,
13652     struct sctp_tcb *stcb, uint8_t chunk)
13653 {
13654         struct mbuf *m_auth;
13655         struct sctp_auth_chunk *auth;
13656         int chunk_len;
13657         struct mbuf *cn;
13658 
13659         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13660             (stcb == NULL))
13661                 return (m);
13662 
13663         if (stcb->asoc.auth_supported == 0) {
13664                 return (m);
13665         }
13666         /* does the requested chunk require auth? */
13667         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13668                 return (m);
13669         }
13670         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13671         if (m_auth == NULL) {
13672                 /* no mbuf's */
13673                 return (m);
13674         }
13675         /* reserve some space if this will be the first mbuf */
13676         if (m == NULL)
13677                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13678         /* fill in the AUTH chunk details */
13679         auth = mtod(m_auth, struct sctp_auth_chunk *);
13680         memset(auth, 0, sizeof(*auth));
13681         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13682         auth->ch.chunk_flags = 0;
13683         chunk_len = sizeof(*auth) +
13684             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13685         auth->ch.chunk_length = htons(chunk_len);
13686         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13687         /* key id and hmac digest will be computed and filled in upon send */
13688 
13689         /* save the offset where the auth was inserted into the chain */
13690         *offset = 0;
13691         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13692                 *offset += SCTP_BUF_LEN(cn);
13693         }
13694 
13695         /* update length and return pointer to the auth chunk */
13696         SCTP_BUF_LEN(m_auth) = chunk_len;
13697         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13698         if (auth_ret != NULL)
13699                 *auth_ret = auth;
13700 
13701         return (m);
13702 }
13703 
13704 #ifdef INET6
13705 int
13706 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t *ro)
13707 {
13708         struct nd_prefix *pfx = NULL;
13709         struct nd_pfxrouter *pfxrtr = NULL;
13710         struct sockaddr_in6 gw6;
13711 
13712         if (ro == NULL || ro->ro_nh == NULL || src6->sin6_family != AF_INET6)
13713                 return (0);
13714 
13715         /* get prefix entry of address */
13716         ND6_RLOCK();
13717         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13718                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13719                         continue;
13720                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13721                     &src6->sin6_addr, &pfx->ndpr_mask))
13722                         break;
13723         }
13724         /* no prefix entry in the prefix list */
13725         if (pfx == NULL) {
13726                 ND6_RUNLOCK();
13727                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13728                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13729                 return (0);
13730         }
13731 
13732         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13733         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13734 
13735         /* search installed gateway from prefix entry */
13736         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13737                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13738                 gw6.sin6_family = AF_INET6;
13739                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13740                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13741                     sizeof(struct in6_addr));
13742                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13743                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13744                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13745                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13746                 if (sctp_cmpaddr((struct sockaddr *)&gw6, &ro->ro_nh->gw_sa)) {
13747                         ND6_RUNLOCK();
13748                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13749                         return (1);
13750                 }
13751         }
13752         ND6_RUNLOCK();
13753         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13754         return (0);
13755 }
13756 #endif
13757 
13758 int
13759 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t *ro)
13760 {
13761 #ifdef INET
13762         struct sockaddr_in *sin, *mask;
13763         struct ifaddr *ifa;
13764         struct in_addr srcnetaddr, gwnetaddr;
13765 
13766         if (ro == NULL || ro->ro_nh == NULL ||
13767             sifa->address.sa.sa_family != AF_INET) {
13768                 return (0);
13769         }
13770         ifa = (struct ifaddr *)sifa->ifa;
13771         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13772         sin = &sifa->address.sin;
13773         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13774         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13775         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13776         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13777 
13778         sin = &ro->ro_nh->gw4_sa;
13779         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13780         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13781         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ro->ro_nh->gw_sa);
13782         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13783         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13784                 return (1);
13785         }
13786 #endif
13787         return (0);
13788 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_output.c

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