The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 /* $KAME: sctp_output.c,v 1.46 2005/03/06 16:04:17 itojun Exp $  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <sys/proc.h>
   38 #include <netinet/sctp_var.h>
   39 #include <netinet/sctp_sysctl.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_uio.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_bsd_addr.h>
   51 #include <netinet/sctp_input.h>
   52 
   53 
   54 
   55 #define SCTP_MAX_GAPS_INARRAY 4
   56 struct sack_track {
   57         uint8_t right_edge;     /* mergable on the right edge */
   58         uint8_t left_edge;      /* mergable on the left edge */
   59         uint8_t num_entries;
   60         uint8_t spare;
   61         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   62 };
   63 
   64 struct sack_track sack_array[256] = {
   65         {0, 0, 0, 0,            /* 0x00 */
   66                 {{0, 0},
   67                 {0, 0},
   68                 {0, 0},
   69                 {0, 0}
   70                 }
   71         },
   72         {1, 0, 1, 0,            /* 0x01 */
   73                 {{0, 0},
   74                 {0, 0},
   75                 {0, 0},
   76                 {0, 0}
   77                 }
   78         },
   79         {0, 0, 1, 0,            /* 0x02 */
   80                 {{1, 1},
   81                 {0, 0},
   82                 {0, 0},
   83                 {0, 0}
   84                 }
   85         },
   86         {1, 0, 1, 0,            /* 0x03 */
   87                 {{0, 1},
   88                 {0, 0},
   89                 {0, 0},
   90                 {0, 0}
   91                 }
   92         },
   93         {0, 0, 1, 0,            /* 0x04 */
   94                 {{2, 2},
   95                 {0, 0},
   96                 {0, 0},
   97                 {0, 0}
   98                 }
   99         },
  100         {1, 0, 2, 0,            /* 0x05 */
  101                 {{0, 0},
  102                 {2, 2},
  103                 {0, 0},
  104                 {0, 0}
  105                 }
  106         },
  107         {0, 0, 1, 0,            /* 0x06 */
  108                 {{1, 2},
  109                 {0, 0},
  110                 {0, 0},
  111                 {0, 0}
  112                 }
  113         },
  114         {1, 0, 1, 0,            /* 0x07 */
  115                 {{0, 2},
  116                 {0, 0},
  117                 {0, 0},
  118                 {0, 0}
  119                 }
  120         },
  121         {0, 0, 1, 0,            /* 0x08 */
  122                 {{3, 3},
  123                 {0, 0},
  124                 {0, 0},
  125                 {0, 0}
  126                 }
  127         },
  128         {1, 0, 2, 0,            /* 0x09 */
  129                 {{0, 0},
  130                 {3, 3},
  131                 {0, 0},
  132                 {0, 0}
  133                 }
  134         },
  135         {0, 0, 2, 0,            /* 0x0a */
  136                 {{1, 1},
  137                 {3, 3},
  138                 {0, 0},
  139                 {0, 0}
  140                 }
  141         },
  142         {1, 0, 2, 0,            /* 0x0b */
  143                 {{0, 1},
  144                 {3, 3},
  145                 {0, 0},
  146                 {0, 0}
  147                 }
  148         },
  149         {0, 0, 1, 0,            /* 0x0c */
  150                 {{2, 3},
  151                 {0, 0},
  152                 {0, 0},
  153                 {0, 0}
  154                 }
  155         },
  156         {1, 0, 2, 0,            /* 0x0d */
  157                 {{0, 0},
  158                 {2, 3},
  159                 {0, 0},
  160                 {0, 0}
  161                 }
  162         },
  163         {0, 0, 1, 0,            /* 0x0e */
  164                 {{1, 3},
  165                 {0, 0},
  166                 {0, 0},
  167                 {0, 0}
  168                 }
  169         },
  170         {1, 0, 1, 0,            /* 0x0f */
  171                 {{0, 3},
  172                 {0, 0},
  173                 {0, 0},
  174                 {0, 0}
  175                 }
  176         },
  177         {0, 0, 1, 0,            /* 0x10 */
  178                 {{4, 4},
  179                 {0, 0},
  180                 {0, 0},
  181                 {0, 0}
  182                 }
  183         },
  184         {1, 0, 2, 0,            /* 0x11 */
  185                 {{0, 0},
  186                 {4, 4},
  187                 {0, 0},
  188                 {0, 0}
  189                 }
  190         },
  191         {0, 0, 2, 0,            /* 0x12 */
  192                 {{1, 1},
  193                 {4, 4},
  194                 {0, 0},
  195                 {0, 0}
  196                 }
  197         },
  198         {1, 0, 2, 0,            /* 0x13 */
  199                 {{0, 1},
  200                 {4, 4},
  201                 {0, 0},
  202                 {0, 0}
  203                 }
  204         },
  205         {0, 0, 2, 0,            /* 0x14 */
  206                 {{2, 2},
  207                 {4, 4},
  208                 {0, 0},
  209                 {0, 0}
  210                 }
  211         },
  212         {1, 0, 3, 0,            /* 0x15 */
  213                 {{0, 0},
  214                 {2, 2},
  215                 {4, 4},
  216                 {0, 0}
  217                 }
  218         },
  219         {0, 0, 2, 0,            /* 0x16 */
  220                 {{1, 2},
  221                 {4, 4},
  222                 {0, 0},
  223                 {0, 0}
  224                 }
  225         },
  226         {1, 0, 2, 0,            /* 0x17 */
  227                 {{0, 2},
  228                 {4, 4},
  229                 {0, 0},
  230                 {0, 0}
  231                 }
  232         },
  233         {0, 0, 1, 0,            /* 0x18 */
  234                 {{3, 4},
  235                 {0, 0},
  236                 {0, 0},
  237                 {0, 0}
  238                 }
  239         },
  240         {1, 0, 2, 0,            /* 0x19 */
  241                 {{0, 0},
  242                 {3, 4},
  243                 {0, 0},
  244                 {0, 0}
  245                 }
  246         },
  247         {0, 0, 2, 0,            /* 0x1a */
  248                 {{1, 1},
  249                 {3, 4},
  250                 {0, 0},
  251                 {0, 0}
  252                 }
  253         },
  254         {1, 0, 2, 0,            /* 0x1b */
  255                 {{0, 1},
  256                 {3, 4},
  257                 {0, 0},
  258                 {0, 0}
  259                 }
  260         },
  261         {0, 0, 1, 0,            /* 0x1c */
  262                 {{2, 4},
  263                 {0, 0},
  264                 {0, 0},
  265                 {0, 0}
  266                 }
  267         },
  268         {1, 0, 2, 0,            /* 0x1d */
  269                 {{0, 0},
  270                 {2, 4},
  271                 {0, 0},
  272                 {0, 0}
  273                 }
  274         },
  275         {0, 0, 1, 0,            /* 0x1e */
  276                 {{1, 4},
  277                 {0, 0},
  278                 {0, 0},
  279                 {0, 0}
  280                 }
  281         },
  282         {1, 0, 1, 0,            /* 0x1f */
  283                 {{0, 4},
  284                 {0, 0},
  285                 {0, 0},
  286                 {0, 0}
  287                 }
  288         },
  289         {0, 0, 1, 0,            /* 0x20 */
  290                 {{5, 5},
  291                 {0, 0},
  292                 {0, 0},
  293                 {0, 0}
  294                 }
  295         },
  296         {1, 0, 2, 0,            /* 0x21 */
  297                 {{0, 0},
  298                 {5, 5},
  299                 {0, 0},
  300                 {0, 0}
  301                 }
  302         },
  303         {0, 0, 2, 0,            /* 0x22 */
  304                 {{1, 1},
  305                 {5, 5},
  306                 {0, 0},
  307                 {0, 0}
  308                 }
  309         },
  310         {1, 0, 2, 0,            /* 0x23 */
  311                 {{0, 1},
  312                 {5, 5},
  313                 {0, 0},
  314                 {0, 0}
  315                 }
  316         },
  317         {0, 0, 2, 0,            /* 0x24 */
  318                 {{2, 2},
  319                 {5, 5},
  320                 {0, 0},
  321                 {0, 0}
  322                 }
  323         },
  324         {1, 0, 3, 0,            /* 0x25 */
  325                 {{0, 0},
  326                 {2, 2},
  327                 {5, 5},
  328                 {0, 0}
  329                 }
  330         },
  331         {0, 0, 2, 0,            /* 0x26 */
  332                 {{1, 2},
  333                 {5, 5},
  334                 {0, 0},
  335                 {0, 0}
  336                 }
  337         },
  338         {1, 0, 2, 0,            /* 0x27 */
  339                 {{0, 2},
  340                 {5, 5},
  341                 {0, 0},
  342                 {0, 0}
  343                 }
  344         },
  345         {0, 0, 2, 0,            /* 0x28 */
  346                 {{3, 3},
  347                 {5, 5},
  348                 {0, 0},
  349                 {0, 0}
  350                 }
  351         },
  352         {1, 0, 3, 0,            /* 0x29 */
  353                 {{0, 0},
  354                 {3, 3},
  355                 {5, 5},
  356                 {0, 0}
  357                 }
  358         },
  359         {0, 0, 3, 0,            /* 0x2a */
  360                 {{1, 1},
  361                 {3, 3},
  362                 {5, 5},
  363                 {0, 0}
  364                 }
  365         },
  366         {1, 0, 3, 0,            /* 0x2b */
  367                 {{0, 1},
  368                 {3, 3},
  369                 {5, 5},
  370                 {0, 0}
  371                 }
  372         },
  373         {0, 0, 2, 0,            /* 0x2c */
  374                 {{2, 3},
  375                 {5, 5},
  376                 {0, 0},
  377                 {0, 0}
  378                 }
  379         },
  380         {1, 0, 3, 0,            /* 0x2d */
  381                 {{0, 0},
  382                 {2, 3},
  383                 {5, 5},
  384                 {0, 0}
  385                 }
  386         },
  387         {0, 0, 2, 0,            /* 0x2e */
  388                 {{1, 3},
  389                 {5, 5},
  390                 {0, 0},
  391                 {0, 0}
  392                 }
  393         },
  394         {1, 0, 2, 0,            /* 0x2f */
  395                 {{0, 3},
  396                 {5, 5},
  397                 {0, 0},
  398                 {0, 0}
  399                 }
  400         },
  401         {0, 0, 1, 0,            /* 0x30 */
  402                 {{4, 5},
  403                 {0, 0},
  404                 {0, 0},
  405                 {0, 0}
  406                 }
  407         },
  408         {1, 0, 2, 0,            /* 0x31 */
  409                 {{0, 0},
  410                 {4, 5},
  411                 {0, 0},
  412                 {0, 0}
  413                 }
  414         },
  415         {0, 0, 2, 0,            /* 0x32 */
  416                 {{1, 1},
  417                 {4, 5},
  418                 {0, 0},
  419                 {0, 0}
  420                 }
  421         },
  422         {1, 0, 2, 0,            /* 0x33 */
  423                 {{0, 1},
  424                 {4, 5},
  425                 {0, 0},
  426                 {0, 0}
  427                 }
  428         },
  429         {0, 0, 2, 0,            /* 0x34 */
  430                 {{2, 2},
  431                 {4, 5},
  432                 {0, 0},
  433                 {0, 0}
  434                 }
  435         },
  436         {1, 0, 3, 0,            /* 0x35 */
  437                 {{0, 0},
  438                 {2, 2},
  439                 {4, 5},
  440                 {0, 0}
  441                 }
  442         },
  443         {0, 0, 2, 0,            /* 0x36 */
  444                 {{1, 2},
  445                 {4, 5},
  446                 {0, 0},
  447                 {0, 0}
  448                 }
  449         },
  450         {1, 0, 2, 0,            /* 0x37 */
  451                 {{0, 2},
  452                 {4, 5},
  453                 {0, 0},
  454                 {0, 0}
  455                 }
  456         },
  457         {0, 0, 1, 0,            /* 0x38 */
  458                 {{3, 5},
  459                 {0, 0},
  460                 {0, 0},
  461                 {0, 0}
  462                 }
  463         },
  464         {1, 0, 2, 0,            /* 0x39 */
  465                 {{0, 0},
  466                 {3, 5},
  467                 {0, 0},
  468                 {0, 0}
  469                 }
  470         },
  471         {0, 0, 2, 0,            /* 0x3a */
  472                 {{1, 1},
  473                 {3, 5},
  474                 {0, 0},
  475                 {0, 0}
  476                 }
  477         },
  478         {1, 0, 2, 0,            /* 0x3b */
  479                 {{0, 1},
  480                 {3, 5},
  481                 {0, 0},
  482                 {0, 0}
  483                 }
  484         },
  485         {0, 0, 1, 0,            /* 0x3c */
  486                 {{2, 5},
  487                 {0, 0},
  488                 {0, 0},
  489                 {0, 0}
  490                 }
  491         },
  492         {1, 0, 2, 0,            /* 0x3d */
  493                 {{0, 0},
  494                 {2, 5},
  495                 {0, 0},
  496                 {0, 0}
  497                 }
  498         },
  499         {0, 0, 1, 0,            /* 0x3e */
  500                 {{1, 5},
  501                 {0, 0},
  502                 {0, 0},
  503                 {0, 0}
  504                 }
  505         },
  506         {1, 0, 1, 0,            /* 0x3f */
  507                 {{0, 5},
  508                 {0, 0},
  509                 {0, 0},
  510                 {0, 0}
  511                 }
  512         },
  513         {0, 0, 1, 0,            /* 0x40 */
  514                 {{6, 6},
  515                 {0, 0},
  516                 {0, 0},
  517                 {0, 0}
  518                 }
  519         },
  520         {1, 0, 2, 0,            /* 0x41 */
  521                 {{0, 0},
  522                 {6, 6},
  523                 {0, 0},
  524                 {0, 0}
  525                 }
  526         },
  527         {0, 0, 2, 0,            /* 0x42 */
  528                 {{1, 1},
  529                 {6, 6},
  530                 {0, 0},
  531                 {0, 0}
  532                 }
  533         },
  534         {1, 0, 2, 0,            /* 0x43 */
  535                 {{0, 1},
  536                 {6, 6},
  537                 {0, 0},
  538                 {0, 0}
  539                 }
  540         },
  541         {0, 0, 2, 0,            /* 0x44 */
  542                 {{2, 2},
  543                 {6, 6},
  544                 {0, 0},
  545                 {0, 0}
  546                 }
  547         },
  548         {1, 0, 3, 0,            /* 0x45 */
  549                 {{0, 0},
  550                 {2, 2},
  551                 {6, 6},
  552                 {0, 0}
  553                 }
  554         },
  555         {0, 0, 2, 0,            /* 0x46 */
  556                 {{1, 2},
  557                 {6, 6},
  558                 {0, 0},
  559                 {0, 0}
  560                 }
  561         },
  562         {1, 0, 2, 0,            /* 0x47 */
  563                 {{0, 2},
  564                 {6, 6},
  565                 {0, 0},
  566                 {0, 0}
  567                 }
  568         },
  569         {0, 0, 2, 0,            /* 0x48 */
  570                 {{3, 3},
  571                 {6, 6},
  572                 {0, 0},
  573                 {0, 0}
  574                 }
  575         },
  576         {1, 0, 3, 0,            /* 0x49 */
  577                 {{0, 0},
  578                 {3, 3},
  579                 {6, 6},
  580                 {0, 0}
  581                 }
  582         },
  583         {0, 0, 3, 0,            /* 0x4a */
  584                 {{1, 1},
  585                 {3, 3},
  586                 {6, 6},
  587                 {0, 0}
  588                 }
  589         },
  590         {1, 0, 3, 0,            /* 0x4b */
  591                 {{0, 1},
  592                 {3, 3},
  593                 {6, 6},
  594                 {0, 0}
  595                 }
  596         },
  597         {0, 0, 2, 0,            /* 0x4c */
  598                 {{2, 3},
  599                 {6, 6},
  600                 {0, 0},
  601                 {0, 0}
  602                 }
  603         },
  604         {1, 0, 3, 0,            /* 0x4d */
  605                 {{0, 0},
  606                 {2, 3},
  607                 {6, 6},
  608                 {0, 0}
  609                 }
  610         },
  611         {0, 0, 2, 0,            /* 0x4e */
  612                 {{1, 3},
  613                 {6, 6},
  614                 {0, 0},
  615                 {0, 0}
  616                 }
  617         },
  618         {1, 0, 2, 0,            /* 0x4f */
  619                 {{0, 3},
  620                 {6, 6},
  621                 {0, 0},
  622                 {0, 0}
  623                 }
  624         },
  625         {0, 0, 2, 0,            /* 0x50 */
  626                 {{4, 4},
  627                 {6, 6},
  628                 {0, 0},
  629                 {0, 0}
  630                 }
  631         },
  632         {1, 0, 3, 0,            /* 0x51 */
  633                 {{0, 0},
  634                 {4, 4},
  635                 {6, 6},
  636                 {0, 0}
  637                 }
  638         },
  639         {0, 0, 3, 0,            /* 0x52 */
  640                 {{1, 1},
  641                 {4, 4},
  642                 {6, 6},
  643                 {0, 0}
  644                 }
  645         },
  646         {1, 0, 3, 0,            /* 0x53 */
  647                 {{0, 1},
  648                 {4, 4},
  649                 {6, 6},
  650                 {0, 0}
  651                 }
  652         },
  653         {0, 0, 3, 0,            /* 0x54 */
  654                 {{2, 2},
  655                 {4, 4},
  656                 {6, 6},
  657                 {0, 0}
  658                 }
  659         },
  660         {1, 0, 4, 0,            /* 0x55 */
  661                 {{0, 0},
  662                 {2, 2},
  663                 {4, 4},
  664                 {6, 6}
  665                 }
  666         },
  667         {0, 0, 3, 0,            /* 0x56 */
  668                 {{1, 2},
  669                 {4, 4},
  670                 {6, 6},
  671                 {0, 0}
  672                 }
  673         },
  674         {1, 0, 3, 0,            /* 0x57 */
  675                 {{0, 2},
  676                 {4, 4},
  677                 {6, 6},
  678                 {0, 0}
  679                 }
  680         },
  681         {0, 0, 2, 0,            /* 0x58 */
  682                 {{3, 4},
  683                 {6, 6},
  684                 {0, 0},
  685                 {0, 0}
  686                 }
  687         },
  688         {1, 0, 3, 0,            /* 0x59 */
  689                 {{0, 0},
  690                 {3, 4},
  691                 {6, 6},
  692                 {0, 0}
  693                 }
  694         },
  695         {0, 0, 3, 0,            /* 0x5a */
  696                 {{1, 1},
  697                 {3, 4},
  698                 {6, 6},
  699                 {0, 0}
  700                 }
  701         },
  702         {1, 0, 3, 0,            /* 0x5b */
  703                 {{0, 1},
  704                 {3, 4},
  705                 {6, 6},
  706                 {0, 0}
  707                 }
  708         },
  709         {0, 0, 2, 0,            /* 0x5c */
  710                 {{2, 4},
  711                 {6, 6},
  712                 {0, 0},
  713                 {0, 0}
  714                 }
  715         },
  716         {1, 0, 3, 0,            /* 0x5d */
  717                 {{0, 0},
  718                 {2, 4},
  719                 {6, 6},
  720                 {0, 0}
  721                 }
  722         },
  723         {0, 0, 2, 0,            /* 0x5e */
  724                 {{1, 4},
  725                 {6, 6},
  726                 {0, 0},
  727                 {0, 0}
  728                 }
  729         },
  730         {1, 0, 2, 0,            /* 0x5f */
  731                 {{0, 4},
  732                 {6, 6},
  733                 {0, 0},
  734                 {0, 0}
  735                 }
  736         },
  737         {0, 0, 1, 0,            /* 0x60 */
  738                 {{5, 6},
  739                 {0, 0},
  740                 {0, 0},
  741                 {0, 0}
  742                 }
  743         },
  744         {1, 0, 2, 0,            /* 0x61 */
  745                 {{0, 0},
  746                 {5, 6},
  747                 {0, 0},
  748                 {0, 0}
  749                 }
  750         },
  751         {0, 0, 2, 0,            /* 0x62 */
  752                 {{1, 1},
  753                 {5, 6},
  754                 {0, 0},
  755                 {0, 0}
  756                 }
  757         },
  758         {1, 0, 2, 0,            /* 0x63 */
  759                 {{0, 1},
  760                 {5, 6},
  761                 {0, 0},
  762                 {0, 0}
  763                 }
  764         },
  765         {0, 0, 2, 0,            /* 0x64 */
  766                 {{2, 2},
  767                 {5, 6},
  768                 {0, 0},
  769                 {0, 0}
  770                 }
  771         },
  772         {1, 0, 3, 0,            /* 0x65 */
  773                 {{0, 0},
  774                 {2, 2},
  775                 {5, 6},
  776                 {0, 0}
  777                 }
  778         },
  779         {0, 0, 2, 0,            /* 0x66 */
  780                 {{1, 2},
  781                 {5, 6},
  782                 {0, 0},
  783                 {0, 0}
  784                 }
  785         },
  786         {1, 0, 2, 0,            /* 0x67 */
  787                 {{0, 2},
  788                 {5, 6},
  789                 {0, 0},
  790                 {0, 0}
  791                 }
  792         },
  793         {0, 0, 2, 0,            /* 0x68 */
  794                 {{3, 3},
  795                 {5, 6},
  796                 {0, 0},
  797                 {0, 0}
  798                 }
  799         },
  800         {1, 0, 3, 0,            /* 0x69 */
  801                 {{0, 0},
  802                 {3, 3},
  803                 {5, 6},
  804                 {0, 0}
  805                 }
  806         },
  807         {0, 0, 3, 0,            /* 0x6a */
  808                 {{1, 1},
  809                 {3, 3},
  810                 {5, 6},
  811                 {0, 0}
  812                 }
  813         },
  814         {1, 0, 3, 0,            /* 0x6b */
  815                 {{0, 1},
  816                 {3, 3},
  817                 {5, 6},
  818                 {0, 0}
  819                 }
  820         },
  821         {0, 0, 2, 0,            /* 0x6c */
  822                 {{2, 3},
  823                 {5, 6},
  824                 {0, 0},
  825                 {0, 0}
  826                 }
  827         },
  828         {1, 0, 3, 0,            /* 0x6d */
  829                 {{0, 0},
  830                 {2, 3},
  831                 {5, 6},
  832                 {0, 0}
  833                 }
  834         },
  835         {0, 0, 2, 0,            /* 0x6e */
  836                 {{1, 3},
  837                 {5, 6},
  838                 {0, 0},
  839                 {0, 0}
  840                 }
  841         },
  842         {1, 0, 2, 0,            /* 0x6f */
  843                 {{0, 3},
  844                 {5, 6},
  845                 {0, 0},
  846                 {0, 0}
  847                 }
  848         },
  849         {0, 0, 1, 0,            /* 0x70 */
  850                 {{4, 6},
  851                 {0, 0},
  852                 {0, 0},
  853                 {0, 0}
  854                 }
  855         },
  856         {1, 0, 2, 0,            /* 0x71 */
  857                 {{0, 0},
  858                 {4, 6},
  859                 {0, 0},
  860                 {0, 0}
  861                 }
  862         },
  863         {0, 0, 2, 0,            /* 0x72 */
  864                 {{1, 1},
  865                 {4, 6},
  866                 {0, 0},
  867                 {0, 0}
  868                 }
  869         },
  870         {1, 0, 2, 0,            /* 0x73 */
  871                 {{0, 1},
  872                 {4, 6},
  873                 {0, 0},
  874                 {0, 0}
  875                 }
  876         },
  877         {0, 0, 2, 0,            /* 0x74 */
  878                 {{2, 2},
  879                 {4, 6},
  880                 {0, 0},
  881                 {0, 0}
  882                 }
  883         },
  884         {1, 0, 3, 0,            /* 0x75 */
  885                 {{0, 0},
  886                 {2, 2},
  887                 {4, 6},
  888                 {0, 0}
  889                 }
  890         },
  891         {0, 0, 2, 0,            /* 0x76 */
  892                 {{1, 2},
  893                 {4, 6},
  894                 {0, 0},
  895                 {0, 0}
  896                 }
  897         },
  898         {1, 0, 2, 0,            /* 0x77 */
  899                 {{0, 2},
  900                 {4, 6},
  901                 {0, 0},
  902                 {0, 0}
  903                 }
  904         },
  905         {0, 0, 1, 0,            /* 0x78 */
  906                 {{3, 6},
  907                 {0, 0},
  908                 {0, 0},
  909                 {0, 0}
  910                 }
  911         },
  912         {1, 0, 2, 0,            /* 0x79 */
  913                 {{0, 0},
  914                 {3, 6},
  915                 {0, 0},
  916                 {0, 0}
  917                 }
  918         },
  919         {0, 0, 2, 0,            /* 0x7a */
  920                 {{1, 1},
  921                 {3, 6},
  922                 {0, 0},
  923                 {0, 0}
  924                 }
  925         },
  926         {1, 0, 2, 0,            /* 0x7b */
  927                 {{0, 1},
  928                 {3, 6},
  929                 {0, 0},
  930                 {0, 0}
  931                 }
  932         },
  933         {0, 0, 1, 0,            /* 0x7c */
  934                 {{2, 6},
  935                 {0, 0},
  936                 {0, 0},
  937                 {0, 0}
  938                 }
  939         },
  940         {1, 0, 2, 0,            /* 0x7d */
  941                 {{0, 0},
  942                 {2, 6},
  943                 {0, 0},
  944                 {0, 0}
  945                 }
  946         },
  947         {0, 0, 1, 0,            /* 0x7e */
  948                 {{1, 6},
  949                 {0, 0},
  950                 {0, 0},
  951                 {0, 0}
  952                 }
  953         },
  954         {1, 0, 1, 0,            /* 0x7f */
  955                 {{0, 6},
  956                 {0, 0},
  957                 {0, 0},
  958                 {0, 0}
  959                 }
  960         },
  961         {0, 1, 1, 0,            /* 0x80 */
  962                 {{7, 7},
  963                 {0, 0},
  964                 {0, 0},
  965                 {0, 0}
  966                 }
  967         },
  968         {1, 1, 2, 0,            /* 0x81 */
  969                 {{0, 0},
  970                 {7, 7},
  971                 {0, 0},
  972                 {0, 0}
  973                 }
  974         },
  975         {0, 1, 2, 0,            /* 0x82 */
  976                 {{1, 1},
  977                 {7, 7},
  978                 {0, 0},
  979                 {0, 0}
  980                 }
  981         },
  982         {1, 1, 2, 0,            /* 0x83 */
  983                 {{0, 1},
  984                 {7, 7},
  985                 {0, 0},
  986                 {0, 0}
  987                 }
  988         },
  989         {0, 1, 2, 0,            /* 0x84 */
  990                 {{2, 2},
  991                 {7, 7},
  992                 {0, 0},
  993                 {0, 0}
  994                 }
  995         },
  996         {1, 1, 3, 0,            /* 0x85 */
  997                 {{0, 0},
  998                 {2, 2},
  999                 {7, 7},
 1000                 {0, 0}
 1001                 }
 1002         },
 1003         {0, 1, 2, 0,            /* 0x86 */
 1004                 {{1, 2},
 1005                 {7, 7},
 1006                 {0, 0},
 1007                 {0, 0}
 1008                 }
 1009         },
 1010         {1, 1, 2, 0,            /* 0x87 */
 1011                 {{0, 2},
 1012                 {7, 7},
 1013                 {0, 0},
 1014                 {0, 0}
 1015                 }
 1016         },
 1017         {0, 1, 2, 0,            /* 0x88 */
 1018                 {{3, 3},
 1019                 {7, 7},
 1020                 {0, 0},
 1021                 {0, 0}
 1022                 }
 1023         },
 1024         {1, 1, 3, 0,            /* 0x89 */
 1025                 {{0, 0},
 1026                 {3, 3},
 1027                 {7, 7},
 1028                 {0, 0}
 1029                 }
 1030         },
 1031         {0, 1, 3, 0,            /* 0x8a */
 1032                 {{1, 1},
 1033                 {3, 3},
 1034                 {7, 7},
 1035                 {0, 0}
 1036                 }
 1037         },
 1038         {1, 1, 3, 0,            /* 0x8b */
 1039                 {{0, 1},
 1040                 {3, 3},
 1041                 {7, 7},
 1042                 {0, 0}
 1043                 }
 1044         },
 1045         {0, 1, 2, 0,            /* 0x8c */
 1046                 {{2, 3},
 1047                 {7, 7},
 1048                 {0, 0},
 1049                 {0, 0}
 1050                 }
 1051         },
 1052         {1, 1, 3, 0,            /* 0x8d */
 1053                 {{0, 0},
 1054                 {2, 3},
 1055                 {7, 7},
 1056                 {0, 0}
 1057                 }
 1058         },
 1059         {0, 1, 2, 0,            /* 0x8e */
 1060                 {{1, 3},
 1061                 {7, 7},
 1062                 {0, 0},
 1063                 {0, 0}
 1064                 }
 1065         },
 1066         {1, 1, 2, 0,            /* 0x8f */
 1067                 {{0, 3},
 1068                 {7, 7},
 1069                 {0, 0},
 1070                 {0, 0}
 1071                 }
 1072         },
 1073         {0, 1, 2, 0,            /* 0x90 */
 1074                 {{4, 4},
 1075                 {7, 7},
 1076                 {0, 0},
 1077                 {0, 0}
 1078                 }
 1079         },
 1080         {1, 1, 3, 0,            /* 0x91 */
 1081                 {{0, 0},
 1082                 {4, 4},
 1083                 {7, 7},
 1084                 {0, 0}
 1085                 }
 1086         },
 1087         {0, 1, 3, 0,            /* 0x92 */
 1088                 {{1, 1},
 1089                 {4, 4},
 1090                 {7, 7},
 1091                 {0, 0}
 1092                 }
 1093         },
 1094         {1, 1, 3, 0,            /* 0x93 */
 1095                 {{0, 1},
 1096                 {4, 4},
 1097                 {7, 7},
 1098                 {0, 0}
 1099                 }
 1100         },
 1101         {0, 1, 3, 0,            /* 0x94 */
 1102                 {{2, 2},
 1103                 {4, 4},
 1104                 {7, 7},
 1105                 {0, 0}
 1106                 }
 1107         },
 1108         {1, 1, 4, 0,            /* 0x95 */
 1109                 {{0, 0},
 1110                 {2, 2},
 1111                 {4, 4},
 1112                 {7, 7}
 1113                 }
 1114         },
 1115         {0, 1, 3, 0,            /* 0x96 */
 1116                 {{1, 2},
 1117                 {4, 4},
 1118                 {7, 7},
 1119                 {0, 0}
 1120                 }
 1121         },
 1122         {1, 1, 3, 0,            /* 0x97 */
 1123                 {{0, 2},
 1124                 {4, 4},
 1125                 {7, 7},
 1126                 {0, 0}
 1127                 }
 1128         },
 1129         {0, 1, 2, 0,            /* 0x98 */
 1130                 {{3, 4},
 1131                 {7, 7},
 1132                 {0, 0},
 1133                 {0, 0}
 1134                 }
 1135         },
 1136         {1, 1, 3, 0,            /* 0x99 */
 1137                 {{0, 0},
 1138                 {3, 4},
 1139                 {7, 7},
 1140                 {0, 0}
 1141                 }
 1142         },
 1143         {0, 1, 3, 0,            /* 0x9a */
 1144                 {{1, 1},
 1145                 {3, 4},
 1146                 {7, 7},
 1147                 {0, 0}
 1148                 }
 1149         },
 1150         {1, 1, 3, 0,            /* 0x9b */
 1151                 {{0, 1},
 1152                 {3, 4},
 1153                 {7, 7},
 1154                 {0, 0}
 1155                 }
 1156         },
 1157         {0, 1, 2, 0,            /* 0x9c */
 1158                 {{2, 4},
 1159                 {7, 7},
 1160                 {0, 0},
 1161                 {0, 0}
 1162                 }
 1163         },
 1164         {1, 1, 3, 0,            /* 0x9d */
 1165                 {{0, 0},
 1166                 {2, 4},
 1167                 {7, 7},
 1168                 {0, 0}
 1169                 }
 1170         },
 1171         {0, 1, 2, 0,            /* 0x9e */
 1172                 {{1, 4},
 1173                 {7, 7},
 1174                 {0, 0},
 1175                 {0, 0}
 1176                 }
 1177         },
 1178         {1, 1, 2, 0,            /* 0x9f */
 1179                 {{0, 4},
 1180                 {7, 7},
 1181                 {0, 0},
 1182                 {0, 0}
 1183                 }
 1184         },
 1185         {0, 1, 2, 0,            /* 0xa0 */
 1186                 {{5, 5},
 1187                 {7, 7},
 1188                 {0, 0},
 1189                 {0, 0}
 1190                 }
 1191         },
 1192         {1, 1, 3, 0,            /* 0xa1 */
 1193                 {{0, 0},
 1194                 {5, 5},
 1195                 {7, 7},
 1196                 {0, 0}
 1197                 }
 1198         },
 1199         {0, 1, 3, 0,            /* 0xa2 */
 1200                 {{1, 1},
 1201                 {5, 5},
 1202                 {7, 7},
 1203                 {0, 0}
 1204                 }
 1205         },
 1206         {1, 1, 3, 0,            /* 0xa3 */
 1207                 {{0, 1},
 1208                 {5, 5},
 1209                 {7, 7},
 1210                 {0, 0}
 1211                 }
 1212         },
 1213         {0, 1, 3, 0,            /* 0xa4 */
 1214                 {{2, 2},
 1215                 {5, 5},
 1216                 {7, 7},
 1217                 {0, 0}
 1218                 }
 1219         },
 1220         {1, 1, 4, 0,            /* 0xa5 */
 1221                 {{0, 0},
 1222                 {2, 2},
 1223                 {5, 5},
 1224                 {7, 7}
 1225                 }
 1226         },
 1227         {0, 1, 3, 0,            /* 0xa6 */
 1228                 {{1, 2},
 1229                 {5, 5},
 1230                 {7, 7},
 1231                 {0, 0}
 1232                 }
 1233         },
 1234         {1, 1, 3, 0,            /* 0xa7 */
 1235                 {{0, 2},
 1236                 {5, 5},
 1237                 {7, 7},
 1238                 {0, 0}
 1239                 }
 1240         },
 1241         {0, 1, 3, 0,            /* 0xa8 */
 1242                 {{3, 3},
 1243                 {5, 5},
 1244                 {7, 7},
 1245                 {0, 0}
 1246                 }
 1247         },
 1248         {1, 1, 4, 0,            /* 0xa9 */
 1249                 {{0, 0},
 1250                 {3, 3},
 1251                 {5, 5},
 1252                 {7, 7}
 1253                 }
 1254         },
 1255         {0, 1, 4, 0,            /* 0xaa */
 1256                 {{1, 1},
 1257                 {3, 3},
 1258                 {5, 5},
 1259                 {7, 7}
 1260                 }
 1261         },
 1262         {1, 1, 4, 0,            /* 0xab */
 1263                 {{0, 1},
 1264                 {3, 3},
 1265                 {5, 5},
 1266                 {7, 7}
 1267                 }
 1268         },
 1269         {0, 1, 3, 0,            /* 0xac */
 1270                 {{2, 3},
 1271                 {5, 5},
 1272                 {7, 7},
 1273                 {0, 0}
 1274                 }
 1275         },
 1276         {1, 1, 4, 0,            /* 0xad */
 1277                 {{0, 0},
 1278                 {2, 3},
 1279                 {5, 5},
 1280                 {7, 7}
 1281                 }
 1282         },
 1283         {0, 1, 3, 0,            /* 0xae */
 1284                 {{1, 3},
 1285                 {5, 5},
 1286                 {7, 7},
 1287                 {0, 0}
 1288                 }
 1289         },
 1290         {1, 1, 3, 0,            /* 0xaf */
 1291                 {{0, 3},
 1292                 {5, 5},
 1293                 {7, 7},
 1294                 {0, 0}
 1295                 }
 1296         },
 1297         {0, 1, 2, 0,            /* 0xb0 */
 1298                 {{4, 5},
 1299                 {7, 7},
 1300                 {0, 0},
 1301                 {0, 0}
 1302                 }
 1303         },
 1304         {1, 1, 3, 0,            /* 0xb1 */
 1305                 {{0, 0},
 1306                 {4, 5},
 1307                 {7, 7},
 1308                 {0, 0}
 1309                 }
 1310         },
 1311         {0, 1, 3, 0,            /* 0xb2 */
 1312                 {{1, 1},
 1313                 {4, 5},
 1314                 {7, 7},
 1315                 {0, 0}
 1316                 }
 1317         },
 1318         {1, 1, 3, 0,            /* 0xb3 */
 1319                 {{0, 1},
 1320                 {4, 5},
 1321                 {7, 7},
 1322                 {0, 0}
 1323                 }
 1324         },
 1325         {0, 1, 3, 0,            /* 0xb4 */
 1326                 {{2, 2},
 1327                 {4, 5},
 1328                 {7, 7},
 1329                 {0, 0}
 1330                 }
 1331         },
 1332         {1, 1, 4, 0,            /* 0xb5 */
 1333                 {{0, 0},
 1334                 {2, 2},
 1335                 {4, 5},
 1336                 {7, 7}
 1337                 }
 1338         },
 1339         {0, 1, 3, 0,            /* 0xb6 */
 1340                 {{1, 2},
 1341                 {4, 5},
 1342                 {7, 7},
 1343                 {0, 0}
 1344                 }
 1345         },
 1346         {1, 1, 3, 0,            /* 0xb7 */
 1347                 {{0, 2},
 1348                 {4, 5},
 1349                 {7, 7},
 1350                 {0, 0}
 1351                 }
 1352         },
 1353         {0, 1, 2, 0,            /* 0xb8 */
 1354                 {{3, 5},
 1355                 {7, 7},
 1356                 {0, 0},
 1357                 {0, 0}
 1358                 }
 1359         },
 1360         {1, 1, 3, 0,            /* 0xb9 */
 1361                 {{0, 0},
 1362                 {3, 5},
 1363                 {7, 7},
 1364                 {0, 0}
 1365                 }
 1366         },
 1367         {0, 1, 3, 0,            /* 0xba */
 1368                 {{1, 1},
 1369                 {3, 5},
 1370                 {7, 7},
 1371                 {0, 0}
 1372                 }
 1373         },
 1374         {1, 1, 3, 0,            /* 0xbb */
 1375                 {{0, 1},
 1376                 {3, 5},
 1377                 {7, 7},
 1378                 {0, 0}
 1379                 }
 1380         },
 1381         {0, 1, 2, 0,            /* 0xbc */
 1382                 {{2, 5},
 1383                 {7, 7},
 1384                 {0, 0},
 1385                 {0, 0}
 1386                 }
 1387         },
 1388         {1, 1, 3, 0,            /* 0xbd */
 1389                 {{0, 0},
 1390                 {2, 5},
 1391                 {7, 7},
 1392                 {0, 0}
 1393                 }
 1394         },
 1395         {0, 1, 2, 0,            /* 0xbe */
 1396                 {{1, 5},
 1397                 {7, 7},
 1398                 {0, 0},
 1399                 {0, 0}
 1400                 }
 1401         },
 1402         {1, 1, 2, 0,            /* 0xbf */
 1403                 {{0, 5},
 1404                 {7, 7},
 1405                 {0, 0},
 1406                 {0, 0}
 1407                 }
 1408         },
 1409         {0, 1, 1, 0,            /* 0xc0 */
 1410                 {{6, 7},
 1411                 {0, 0},
 1412                 {0, 0},
 1413                 {0, 0}
 1414                 }
 1415         },
 1416         {1, 1, 2, 0,            /* 0xc1 */
 1417                 {{0, 0},
 1418                 {6, 7},
 1419                 {0, 0},
 1420                 {0, 0}
 1421                 }
 1422         },
 1423         {0, 1, 2, 0,            /* 0xc2 */
 1424                 {{1, 1},
 1425                 {6, 7},
 1426                 {0, 0},
 1427                 {0, 0}
 1428                 }
 1429         },
 1430         {1, 1, 2, 0,            /* 0xc3 */
 1431                 {{0, 1},
 1432                 {6, 7},
 1433                 {0, 0},
 1434                 {0, 0}
 1435                 }
 1436         },
 1437         {0, 1, 2, 0,            /* 0xc4 */
 1438                 {{2, 2},
 1439                 {6, 7},
 1440                 {0, 0},
 1441                 {0, 0}
 1442                 }
 1443         },
 1444         {1, 1, 3, 0,            /* 0xc5 */
 1445                 {{0, 0},
 1446                 {2, 2},
 1447                 {6, 7},
 1448                 {0, 0}
 1449                 }
 1450         },
 1451         {0, 1, 2, 0,            /* 0xc6 */
 1452                 {{1, 2},
 1453                 {6, 7},
 1454                 {0, 0},
 1455                 {0, 0}
 1456                 }
 1457         },
 1458         {1, 1, 2, 0,            /* 0xc7 */
 1459                 {{0, 2},
 1460                 {6, 7},
 1461                 {0, 0},
 1462                 {0, 0}
 1463                 }
 1464         },
 1465         {0, 1, 2, 0,            /* 0xc8 */
 1466                 {{3, 3},
 1467                 {6, 7},
 1468                 {0, 0},
 1469                 {0, 0}
 1470                 }
 1471         },
 1472         {1, 1, 3, 0,            /* 0xc9 */
 1473                 {{0, 0},
 1474                 {3, 3},
 1475                 {6, 7},
 1476                 {0, 0}
 1477                 }
 1478         },
 1479         {0, 1, 3, 0,            /* 0xca */
 1480                 {{1, 1},
 1481                 {3, 3},
 1482                 {6, 7},
 1483                 {0, 0}
 1484                 }
 1485         },
 1486         {1, 1, 3, 0,            /* 0xcb */
 1487                 {{0, 1},
 1488                 {3, 3},
 1489                 {6, 7},
 1490                 {0, 0}
 1491                 }
 1492         },
 1493         {0, 1, 2, 0,            /* 0xcc */
 1494                 {{2, 3},
 1495                 {6, 7},
 1496                 {0, 0},
 1497                 {0, 0}
 1498                 }
 1499         },
 1500         {1, 1, 3, 0,            /* 0xcd */
 1501                 {{0, 0},
 1502                 {2, 3},
 1503                 {6, 7},
 1504                 {0, 0}
 1505                 }
 1506         },
 1507         {0, 1, 2, 0,            /* 0xce */
 1508                 {{1, 3},
 1509                 {6, 7},
 1510                 {0, 0},
 1511                 {0, 0}
 1512                 }
 1513         },
 1514         {1, 1, 2, 0,            /* 0xcf */
 1515                 {{0, 3},
 1516                 {6, 7},
 1517                 {0, 0},
 1518                 {0, 0}
 1519                 }
 1520         },
 1521         {0, 1, 2, 0,            /* 0xd0 */
 1522                 {{4, 4},
 1523                 {6, 7},
 1524                 {0, 0},
 1525                 {0, 0}
 1526                 }
 1527         },
 1528         {1, 1, 3, 0,            /* 0xd1 */
 1529                 {{0, 0},
 1530                 {4, 4},
 1531                 {6, 7},
 1532                 {0, 0}
 1533                 }
 1534         },
 1535         {0, 1, 3, 0,            /* 0xd2 */
 1536                 {{1, 1},
 1537                 {4, 4},
 1538                 {6, 7},
 1539                 {0, 0}
 1540                 }
 1541         },
 1542         {1, 1, 3, 0,            /* 0xd3 */
 1543                 {{0, 1},
 1544                 {4, 4},
 1545                 {6, 7},
 1546                 {0, 0}
 1547                 }
 1548         },
 1549         {0, 1, 3, 0,            /* 0xd4 */
 1550                 {{2, 2},
 1551                 {4, 4},
 1552                 {6, 7},
 1553                 {0, 0}
 1554                 }
 1555         },
 1556         {1, 1, 4, 0,            /* 0xd5 */
 1557                 {{0, 0},
 1558                 {2, 2},
 1559                 {4, 4},
 1560                 {6, 7}
 1561                 }
 1562         },
 1563         {0, 1, 3, 0,            /* 0xd6 */
 1564                 {{1, 2},
 1565                 {4, 4},
 1566                 {6, 7},
 1567                 {0, 0}
 1568                 }
 1569         },
 1570         {1, 1, 3, 0,            /* 0xd7 */
 1571                 {{0, 2},
 1572                 {4, 4},
 1573                 {6, 7},
 1574                 {0, 0}
 1575                 }
 1576         },
 1577         {0, 1, 2, 0,            /* 0xd8 */
 1578                 {{3, 4},
 1579                 {6, 7},
 1580                 {0, 0},
 1581                 {0, 0}
 1582                 }
 1583         },
 1584         {1, 1, 3, 0,            /* 0xd9 */
 1585                 {{0, 0},
 1586                 {3, 4},
 1587                 {6, 7},
 1588                 {0, 0}
 1589                 }
 1590         },
 1591         {0, 1, 3, 0,            /* 0xda */
 1592                 {{1, 1},
 1593                 {3, 4},
 1594                 {6, 7},
 1595                 {0, 0}
 1596                 }
 1597         },
 1598         {1, 1, 3, 0,            /* 0xdb */
 1599                 {{0, 1},
 1600                 {3, 4},
 1601                 {6, 7},
 1602                 {0, 0}
 1603                 }
 1604         },
 1605         {0, 1, 2, 0,            /* 0xdc */
 1606                 {{2, 4},
 1607                 {6, 7},
 1608                 {0, 0},
 1609                 {0, 0}
 1610                 }
 1611         },
 1612         {1, 1, 3, 0,            /* 0xdd */
 1613                 {{0, 0},
 1614                 {2, 4},
 1615                 {6, 7},
 1616                 {0, 0}
 1617                 }
 1618         },
 1619         {0, 1, 2, 0,            /* 0xde */
 1620                 {{1, 4},
 1621                 {6, 7},
 1622                 {0, 0},
 1623                 {0, 0}
 1624                 }
 1625         },
 1626         {1, 1, 2, 0,            /* 0xdf */
 1627                 {{0, 4},
 1628                 {6, 7},
 1629                 {0, 0},
 1630                 {0, 0}
 1631                 }
 1632         },
 1633         {0, 1, 1, 0,            /* 0xe0 */
 1634                 {{5, 7},
 1635                 {0, 0},
 1636                 {0, 0},
 1637                 {0, 0}
 1638                 }
 1639         },
 1640         {1, 1, 2, 0,            /* 0xe1 */
 1641                 {{0, 0},
 1642                 {5, 7},
 1643                 {0, 0},
 1644                 {0, 0}
 1645                 }
 1646         },
 1647         {0, 1, 2, 0,            /* 0xe2 */
 1648                 {{1, 1},
 1649                 {5, 7},
 1650                 {0, 0},
 1651                 {0, 0}
 1652                 }
 1653         },
 1654         {1, 1, 2, 0,            /* 0xe3 */
 1655                 {{0, 1},
 1656                 {5, 7},
 1657                 {0, 0},
 1658                 {0, 0}
 1659                 }
 1660         },
 1661         {0, 1, 2, 0,            /* 0xe4 */
 1662                 {{2, 2},
 1663                 {5, 7},
 1664                 {0, 0},
 1665                 {0, 0}
 1666                 }
 1667         },
 1668         {1, 1, 3, 0,            /* 0xe5 */
 1669                 {{0, 0},
 1670                 {2, 2},
 1671                 {5, 7},
 1672                 {0, 0}
 1673                 }
 1674         },
 1675         {0, 1, 2, 0,            /* 0xe6 */
 1676                 {{1, 2},
 1677                 {5, 7},
 1678                 {0, 0},
 1679                 {0, 0}
 1680                 }
 1681         },
 1682         {1, 1, 2, 0,            /* 0xe7 */
 1683                 {{0, 2},
 1684                 {5, 7},
 1685                 {0, 0},
 1686                 {0, 0}
 1687                 }
 1688         },
 1689         {0, 1, 2, 0,            /* 0xe8 */
 1690                 {{3, 3},
 1691                 {5, 7},
 1692                 {0, 0},
 1693                 {0, 0}
 1694                 }
 1695         },
 1696         {1, 1, 3, 0,            /* 0xe9 */
 1697                 {{0, 0},
 1698                 {3, 3},
 1699                 {5, 7},
 1700                 {0, 0}
 1701                 }
 1702         },
 1703         {0, 1, 3, 0,            /* 0xea */
 1704                 {{1, 1},
 1705                 {3, 3},
 1706                 {5, 7},
 1707                 {0, 0}
 1708                 }
 1709         },
 1710         {1, 1, 3, 0,            /* 0xeb */
 1711                 {{0, 1},
 1712                 {3, 3},
 1713                 {5, 7},
 1714                 {0, 0}
 1715                 }
 1716         },
 1717         {0, 1, 2, 0,            /* 0xec */
 1718                 {{2, 3},
 1719                 {5, 7},
 1720                 {0, 0},
 1721                 {0, 0}
 1722                 }
 1723         },
 1724         {1, 1, 3, 0,            /* 0xed */
 1725                 {{0, 0},
 1726                 {2, 3},
 1727                 {5, 7},
 1728                 {0, 0}
 1729                 }
 1730         },
 1731         {0, 1, 2, 0,            /* 0xee */
 1732                 {{1, 3},
 1733                 {5, 7},
 1734                 {0, 0},
 1735                 {0, 0}
 1736                 }
 1737         },
 1738         {1, 1, 2, 0,            /* 0xef */
 1739                 {{0, 3},
 1740                 {5, 7},
 1741                 {0, 0},
 1742                 {0, 0}
 1743                 }
 1744         },
 1745         {0, 1, 1, 0,            /* 0xf0 */
 1746                 {{4, 7},
 1747                 {0, 0},
 1748                 {0, 0},
 1749                 {0, 0}
 1750                 }
 1751         },
 1752         {1, 1, 2, 0,            /* 0xf1 */
 1753                 {{0, 0},
 1754                 {4, 7},
 1755                 {0, 0},
 1756                 {0, 0}
 1757                 }
 1758         },
 1759         {0, 1, 2, 0,            /* 0xf2 */
 1760                 {{1, 1},
 1761                 {4, 7},
 1762                 {0, 0},
 1763                 {0, 0}
 1764                 }
 1765         },
 1766         {1, 1, 2, 0,            /* 0xf3 */
 1767                 {{0, 1},
 1768                 {4, 7},
 1769                 {0, 0},
 1770                 {0, 0}
 1771                 }
 1772         },
 1773         {0, 1, 2, 0,            /* 0xf4 */
 1774                 {{2, 2},
 1775                 {4, 7},
 1776                 {0, 0},
 1777                 {0, 0}
 1778                 }
 1779         },
 1780         {1, 1, 3, 0,            /* 0xf5 */
 1781                 {{0, 0},
 1782                 {2, 2},
 1783                 {4, 7},
 1784                 {0, 0}
 1785                 }
 1786         },
 1787         {0, 1, 2, 0,            /* 0xf6 */
 1788                 {{1, 2},
 1789                 {4, 7},
 1790                 {0, 0},
 1791                 {0, 0}
 1792                 }
 1793         },
 1794         {1, 1, 2, 0,            /* 0xf7 */
 1795                 {{0, 2},
 1796                 {4, 7},
 1797                 {0, 0},
 1798                 {0, 0}
 1799                 }
 1800         },
 1801         {0, 1, 1, 0,            /* 0xf8 */
 1802                 {{3, 7},
 1803                 {0, 0},
 1804                 {0, 0},
 1805                 {0, 0}
 1806                 }
 1807         },
 1808         {1, 1, 2, 0,            /* 0xf9 */
 1809                 {{0, 0},
 1810                 {3, 7},
 1811                 {0, 0},
 1812                 {0, 0}
 1813                 }
 1814         },
 1815         {0, 1, 2, 0,            /* 0xfa */
 1816                 {{1, 1},
 1817                 {3, 7},
 1818                 {0, 0},
 1819                 {0, 0}
 1820                 }
 1821         },
 1822         {1, 1, 2, 0,            /* 0xfb */
 1823                 {{0, 1},
 1824                 {3, 7},
 1825                 {0, 0},
 1826                 {0, 0}
 1827                 }
 1828         },
 1829         {0, 1, 1, 0,            /* 0xfc */
 1830                 {{2, 7},
 1831                 {0, 0},
 1832                 {0, 0},
 1833                 {0, 0}
 1834                 }
 1835         },
 1836         {1, 1, 2, 0,            /* 0xfd */
 1837                 {{0, 0},
 1838                 {2, 7},
 1839                 {0, 0},
 1840                 {0, 0}
 1841                 }
 1842         },
 1843         {0, 1, 1, 0,            /* 0xfe */
 1844                 {{1, 7},
 1845                 {0, 0},
 1846                 {0, 0},
 1847                 {0, 0}
 1848                 }
 1849         },
 1850         {1, 1, 1, 0,            /* 0xff */
 1851                 {{0, 7},
 1852                 {0, 0},
 1853                 {0, 0},
 1854                 {0, 0}
 1855                 }
 1856         }
 1857 };
 1858 
 1859 
 1860 int
 1861 sctp_is_address_in_scope(struct sctp_ifa *ifa,
 1862     int ipv4_addr_legal,
 1863     int ipv6_addr_legal,
 1864     int loopback_scope,
 1865     int ipv4_local_scope,
 1866     int local_scope,
 1867     int site_scope,
 1868     int do_update)
 1869 {
 1870         if ((loopback_scope == 0) &&
 1871             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
 1872                 /*
 1873                  * skip loopback if not in scope *
 1874                  */
 1875                 return (0);
 1876         }
 1877         if ((ifa->address.sa.sa_family == AF_INET) && ipv4_addr_legal) {
 1878                 struct sockaddr_in *sin;
 1879 
 1880                 sin = (struct sockaddr_in *)&ifa->address.sin;
 1881                 if (sin->sin_addr.s_addr == 0) {
 1882                         /* not in scope , unspecified */
 1883                         return (0);
 1884                 }
 1885                 if ((ipv4_local_scope == 0) &&
 1886                     (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 1887                         /* private address not in scope */
 1888                         return (0);
 1889                 }
 1890         } else if ((ifa->address.sa.sa_family == AF_INET6) && ipv6_addr_legal) {
 1891                 struct sockaddr_in6 *sin6;
 1892 
 1893                 /*
 1894                  * Must update the flags,  bummer, which means any IFA locks
 1895                  * must now be applied HERE <->
 1896                  */
 1897                 if (do_update) {
 1898                         sctp_gather_internal_ifa_flags(ifa);
 1899                 }
 1900                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 1901                         return (0);
 1902                 }
 1903                 /* ok to use deprecated addresses? */
 1904                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
 1905                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1906                         /* skip unspecifed addresses */
 1907                         return (0);
 1908                 }
 1909                 if (            /* (local_scope == 0) && */
 1910                     (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
 1911                         return (0);
 1912                 }
 1913                 if ((site_scope == 0) &&
 1914                     (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 1915                         return (0);
 1916                 }
 1917         } else {
 1918                 return (0);
 1919         }
 1920         return (1);
 1921 }
 1922 
 1923 static struct mbuf *
 1924 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa)
 1925 {
 1926         struct sctp_paramhdr *parmh;
 1927         struct mbuf *mret;
 1928         int len;
 1929 
 1930         if (ifa->address.sa.sa_family == AF_INET) {
 1931                 len = sizeof(struct sctp_ipv4addr_param);
 1932         } else if (ifa->address.sa.sa_family == AF_INET6) {
 1933                 len = sizeof(struct sctp_ipv6addr_param);
 1934         } else {
 1935                 /* unknown type */
 1936                 return (m);
 1937         }
 1938         if (M_TRAILINGSPACE(m) >= len) {
 1939                 /* easy side we just drop it on the end */
 1940                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
 1941                 mret = m;
 1942         } else {
 1943                 /* Need more space */
 1944                 mret = m;
 1945                 while (SCTP_BUF_NEXT(mret) != NULL) {
 1946                         mret = SCTP_BUF_NEXT(mret);
 1947                 }
 1948                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA);
 1949                 if (SCTP_BUF_NEXT(mret) == NULL) {
 1950                         /* We are hosed, can't add more addresses */
 1951                         return (m);
 1952                 }
 1953                 mret = SCTP_BUF_NEXT(mret);
 1954                 parmh = mtod(mret, struct sctp_paramhdr *);
 1955         }
 1956         /* now add the parameter */
 1957         if (ifa->address.sa.sa_family == AF_INET) {
 1958                 struct sctp_ipv4addr_param *ipv4p;
 1959                 struct sockaddr_in *sin;
 1960 
 1961                 sin = (struct sockaddr_in *)&ifa->address.sin;
 1962                 ipv4p = (struct sctp_ipv4addr_param *)parmh;
 1963                 parmh->param_type = htons(SCTP_IPV4_ADDRESS);
 1964                 parmh->param_length = htons(len);
 1965                 ipv4p->addr = sin->sin_addr.s_addr;
 1966                 SCTP_BUF_LEN(mret) += len;
 1967         } else if (ifa->address.sa.sa_family == AF_INET6) {
 1968                 struct sctp_ipv6addr_param *ipv6p;
 1969                 struct sockaddr_in6 *sin6;
 1970 
 1971                 sin6 = (struct sockaddr_in6 *)&ifa->address.sin6;
 1972                 ipv6p = (struct sctp_ipv6addr_param *)parmh;
 1973                 parmh->param_type = htons(SCTP_IPV6_ADDRESS);
 1974                 parmh->param_length = htons(len);
 1975                 memcpy(ipv6p->addr, &sin6->sin6_addr,
 1976                     sizeof(ipv6p->addr));
 1977                 /* clear embedded scope in the address */
 1978                 in6_clearscope((struct in6_addr *)ipv6p->addr);
 1979                 SCTP_BUF_LEN(mret) += len;
 1980         } else {
 1981                 return (m);
 1982         }
 1983         return (mret);
 1984 }
 1985 
 1986 
 1987 struct mbuf *
 1988 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_scoping *scope,
 1989     struct mbuf *m_at, int cnt_inits_to)
 1990 {
 1991         struct sctp_vrf *vrf = NULL;
 1992         int cnt, limit_out = 0, total_count;
 1993         uint32_t vrf_id;
 1994 
 1995         vrf_id = inp->def_vrf_id;
 1996         SCTP_IPI_ADDR_RLOCK();
 1997         vrf = sctp_find_vrf(vrf_id);
 1998         if (vrf == NULL) {
 1999                 SCTP_IPI_ADDR_RUNLOCK();
 2000                 return (m_at);
 2001         }
 2002         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 2003                 struct sctp_ifa *sctp_ifap;
 2004                 struct sctp_ifn *sctp_ifnp;
 2005 
 2006                 cnt = cnt_inits_to;
 2007                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 2008                         limit_out = 1;
 2009                         cnt = SCTP_ADDRESS_LIMIT;
 2010                         goto skip_count;
 2011                 }
 2012                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2013                         if ((scope->loopback_scope == 0) &&
 2014                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2015                                 /*
 2016                                  * Skip loopback devices if loopback_scope
 2017                                  * not set
 2018                                  */
 2019                                 continue;
 2020                         }
 2021                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2022                                 if (sctp_is_address_in_scope(sctp_ifap,
 2023                                     scope->ipv4_addr_legal,
 2024                                     scope->ipv6_addr_legal,
 2025                                     scope->loopback_scope,
 2026                                     scope->ipv4_local_scope,
 2027                                     scope->local_scope,
 2028                                     scope->site_scope, 1) == 0) {
 2029                                         continue;
 2030                                 }
 2031                                 cnt++;
 2032                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2033                                         break;
 2034                                 }
 2035                         }
 2036                         if (cnt > SCTP_ADDRESS_LIMIT) {
 2037                                 break;
 2038                         }
 2039                 }
 2040 skip_count:
 2041                 if (cnt > 1) {
 2042                         total_count = 0;
 2043                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2044                                 cnt = 0;
 2045                                 if ((scope->loopback_scope == 0) &&
 2046                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2047                                         /*
 2048                                          * Skip loopback devices if
 2049                                          * loopback_scope not set
 2050                                          */
 2051                                         continue;
 2052                                 }
 2053                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2054                                         if (sctp_is_address_in_scope(sctp_ifap,
 2055                                             scope->ipv4_addr_legal,
 2056                                             scope->ipv6_addr_legal,
 2057                                             scope->loopback_scope,
 2058                                             scope->ipv4_local_scope,
 2059                                             scope->local_scope,
 2060                                             scope->site_scope, 0) == 0) {
 2061                                                 continue;
 2062                                         }
 2063                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap);
 2064                                         if (limit_out) {
 2065                                                 cnt++;
 2066                                                 total_count++;
 2067                                                 if (cnt >= 2) {
 2068                                                         /*
 2069                                                          * two from each
 2070                                                          * address
 2071                                                          */
 2072                                                         break;
 2073                                                 }
 2074                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 2075                                                         /* No more addresses */
 2076                                                         break;
 2077                                                 }
 2078                                         }
 2079                                 }
 2080                         }
 2081                 }
 2082         } else {
 2083                 struct sctp_laddr *laddr;
 2084 
 2085                 cnt = cnt_inits_to;
 2086                 /* First, how many ? */
 2087                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2088                         if (laddr->ifa == NULL) {
 2089                                 continue;
 2090                         }
 2091                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2092                                 /*
 2093                                  * Address being deleted by the system, dont
 2094                                  * list.
 2095                                  */
 2096                                 continue;
 2097                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2098                                 /*
 2099                                  * Address being deleted on this ep don't
 2100                                  * list.
 2101                                  */
 2102                                 continue;
 2103                         }
 2104                         if (sctp_is_address_in_scope(laddr->ifa,
 2105                             scope->ipv4_addr_legal,
 2106                             scope->ipv6_addr_legal,
 2107                             scope->loopback_scope,
 2108                             scope->ipv4_local_scope,
 2109                             scope->local_scope,
 2110                             scope->site_scope, 1) == 0) {
 2111                                 continue;
 2112                         }
 2113                         cnt++;
 2114                 }
 2115                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2116                         limit_out = 1;
 2117                 }
 2118                 /*
 2119                  * To get through a NAT we only list addresses if we have
 2120                  * more than one. That way if you just bind a single address
 2121                  * we let the source of the init dictate our address.
 2122                  */
 2123                 if (cnt > 1) {
 2124                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2125                                 cnt = 0;
 2126                                 if (laddr->ifa == NULL) {
 2127                                         continue;
 2128                                 }
 2129                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2130                                         continue;
 2131 
 2132                                 if (sctp_is_address_in_scope(laddr->ifa,
 2133                                     scope->ipv4_addr_legal,
 2134                                     scope->ipv6_addr_legal,
 2135                                     scope->loopback_scope,
 2136                                     scope->ipv4_local_scope,
 2137                                     scope->local_scope,
 2138                                     scope->site_scope, 0) == 0) {
 2139                                         continue;
 2140                                 }
 2141                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa);
 2142                                 cnt++;
 2143                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 2144                                         break;
 2145                                 }
 2146                         }
 2147                 }
 2148         }
 2149         SCTP_IPI_ADDR_RUNLOCK();
 2150         return (m_at);
 2151 }
 2152 
 2153 static struct sctp_ifa *
 2154 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 2155     uint8_t dest_is_loop,
 2156     uint8_t dest_is_priv,
 2157     sa_family_t fam)
 2158 {
 2159         uint8_t dest_is_global = 0;
 2160 
 2161         /* dest_is_priv is true if destination is a private address */
 2162         /* dest_is_loop is true if destination is a loopback addresses */
 2163 
 2164         /*
 2165          * Here we determine if its a preferred address. A preferred address
 2166          * means it is the same scope or higher scope then the destination.
 2167          * L = loopback, P = private, G = global
 2168          * ----------------------------------------- src    |  dest | result
 2169          * ---------------------------------------- L     |    L  |    yes
 2170          * ----------------------------------------- P     |    L  |
 2171          * yes-v4 no-v6 ----------------------------------------- G     |
 2172          * L  |    yes-v4 no-v6 ----------------------------------------- L
 2173          * |    P  |    no ----------------------------------------- P     |
 2174          * P  |    yes ----------------------------------------- G     |
 2175          * P  |    no ----------------------------------------- L     |    G
 2176          * |    no ----------------------------------------- P     |    G  |
 2177          * no ----------------------------------------- G     |    G  |
 2178          * yes -----------------------------------------
 2179          */
 2180 
 2181         if (ifa->address.sa.sa_family != fam) {
 2182                 /* forget mis-matched family */
 2183                 return (NULL);
 2184         }
 2185         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 2186                 dest_is_global = 1;
 2187         }
 2188         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 2189         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 2190         /* Ok the address may be ok */
 2191         if (fam == AF_INET6) {
 2192                 /* ok to use deprecated addresses? */
 2193                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2194                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 2195                         return (NULL);
 2196                 }
 2197                 if (ifa->src_is_priv) {
 2198                         if (dest_is_loop) {
 2199                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 2200                                 return (NULL);
 2201                         }
 2202                 }
 2203                 if (ifa->src_is_glob) {
 2204                         if (dest_is_loop) {
 2205                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 2206                                 return (NULL);
 2207                         }
 2208                 }
 2209         }
 2210         /*
 2211          * Now that we know what is what, implement or table this could in
 2212          * theory be done slicker (it used to be), but this is
 2213          * straightforward and easier to validate :-)
 2214          */
 2215         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 2216             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 2217         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 2218             dest_is_loop, dest_is_priv, dest_is_global);
 2219 
 2220         if ((ifa->src_is_loop) && (dest_is_priv)) {
 2221                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 2222                 return (NULL);
 2223         }
 2224         if ((ifa->src_is_glob) && (dest_is_priv)) {
 2225                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 2226                 return (NULL);
 2227         }
 2228         if ((ifa->src_is_loop) && (dest_is_global)) {
 2229                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 2230                 return (NULL);
 2231         }
 2232         if ((ifa->src_is_priv) && (dest_is_global)) {
 2233                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 2234                 return (NULL);
 2235         }
 2236         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 2237         /* its a preferred address */
 2238         return (ifa);
 2239 }
 2240 
 2241 static struct sctp_ifa *
 2242 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 2243     uint8_t dest_is_loop,
 2244     uint8_t dest_is_priv,
 2245     sa_family_t fam)
 2246 {
 2247         uint8_t dest_is_global = 0;
 2248 
 2249 
 2250         /*
 2251          * Here we determine if its a acceptable address. A acceptable
 2252          * address means it is the same scope or higher scope but we can
 2253          * allow for NAT which means its ok to have a global dest and a
 2254          * private src.
 2255          * 
 2256          * L = loopback, P = private, G = global
 2257          * ----------------------------------------- src    |  dest | result
 2258          * ----------------------------------------- L     |   L   |    yes
 2259          * ----------------------------------------- P     |   L   |
 2260          * yes-v4 no-v6 ----------------------------------------- G     |
 2261          * L   |    yes ----------------------------------------- L     |
 2262          * P   |    no ----------------------------------------- P     |   P
 2263          * |    yes ----------------------------------------- G     |   P
 2264          * |    yes - May not work -----------------------------------------
 2265          * L     |   G   |    no ----------------------------------------- P
 2266          * |   G   |    yes - May not work
 2267          * ----------------------------------------- G     |   G   |    yes
 2268          * -----------------------------------------
 2269          */
 2270 
 2271         if (ifa->address.sa.sa_family != fam) {
 2272                 /* forget non matching family */
 2273                 return (NULL);
 2274         }
 2275         /* Ok the address may be ok */
 2276         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 2277                 dest_is_global = 1;
 2278         }
 2279         if (fam == AF_INET6) {
 2280                 /* ok to use deprecated addresses? */
 2281                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2282                         return (NULL);
 2283                 }
 2284                 if (ifa->src_is_priv) {
 2285                         /* Special case, linklocal to loop */
 2286                         if (dest_is_loop)
 2287                                 return (NULL);
 2288                 }
 2289         }
 2290         /*
 2291          * Now that we know what is what, implement our table. This could in
 2292          * theory be done slicker (it used to be), but this is
 2293          * straightforward and easier to validate :-)
 2294          */
 2295         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 2296                 return (NULL);
 2297         }
 2298         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 2299                 return (NULL);
 2300         }
 2301         /* its an acceptable address */
 2302         return (ifa);
 2303 }
 2304 
 2305 int
 2306 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 2307 {
 2308         struct sctp_laddr *laddr;
 2309 
 2310         if (stcb == NULL) {
 2311                 /* There are no restrictions, no TCB :-) */
 2312                 return (0);
 2313         }
 2314         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 2315                 if (laddr->ifa == NULL) {
 2316                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2317                             __FUNCTION__);
 2318                         continue;
 2319                 }
 2320                 if (laddr->ifa == ifa) {
 2321                         /* Yes it is on the list */
 2322                         return (1);
 2323                 }
 2324         }
 2325         return (0);
 2326 }
 2327 
 2328 
 2329 int
 2330 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 2331 {
 2332         struct sctp_laddr *laddr;
 2333 
 2334         if (ifa == NULL)
 2335                 return (0);
 2336         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2337                 if (laddr->ifa == NULL) {
 2338                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2339                             __FUNCTION__);
 2340                         continue;
 2341                 }
 2342                 if ((laddr->ifa == ifa) && laddr->action == 0)
 2343                         /* same pointer */
 2344                         return (1);
 2345         }
 2346         return (0);
 2347 }
 2348 
 2349 
 2350 
 2351 static struct sctp_ifa *
 2352 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 2353     sctp_route_t * ro,
 2354     uint32_t vrf_id,
 2355     int non_asoc_addr_ok,
 2356     uint8_t dest_is_priv,
 2357     uint8_t dest_is_loop,
 2358     sa_family_t fam)
 2359 {
 2360         struct sctp_laddr *laddr, *starting_point;
 2361         void *ifn;
 2362         int resettotop = 0;
 2363         struct sctp_ifn *sctp_ifn;
 2364         struct sctp_ifa *sctp_ifa, *sifa;
 2365         struct sctp_vrf *vrf;
 2366         uint32_t ifn_index;
 2367 
 2368         vrf = sctp_find_vrf(vrf_id);
 2369         if (vrf == NULL)
 2370                 return (NULL);
 2371 
 2372         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2373         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2374         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2375         /*
 2376          * first question, is the ifn we will emit on in our list, if so, we
 2377          * want such an address. Note that we first looked for a preferred
 2378          * address.
 2379          */
 2380         if (sctp_ifn) {
 2381                 /* is a preferred one on the interface we route out? */
 2382                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2383                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2384                             (non_asoc_addr_ok == 0))
 2385                                 continue;
 2386                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 2387                             dest_is_loop,
 2388                             dest_is_priv, fam);
 2389                         if (sifa == NULL)
 2390                                 continue;
 2391                         if (sctp_is_addr_in_ep(inp, sifa)) {
 2392                                 atomic_add_int(&sifa->refcount, 1);
 2393                                 return (sifa);
 2394                         }
 2395                 }
 2396         }
 2397         /*
 2398          * ok, now we now need to find one on the list of the addresses. We
 2399          * can't get one on the emitting interface so let's find first a
 2400          * preferred one. If not that an acceptable one otherwise... we
 2401          * return NULL.
 2402          */
 2403         starting_point = inp->next_addr_touse;
 2404 once_again:
 2405         if (inp->next_addr_touse == NULL) {
 2406                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2407                 resettotop = 1;
 2408         }
 2409         for (laddr = inp->next_addr_touse; laddr;
 2410             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2411                 if (laddr->ifa == NULL) {
 2412                         /* address has been removed */
 2413                         continue;
 2414                 }
 2415                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2416                         /* address is being deleted */
 2417                         continue;
 2418                 }
 2419                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 2420                     dest_is_priv, fam);
 2421                 if (sifa == NULL)
 2422                         continue;
 2423                 atomic_add_int(&sifa->refcount, 1);
 2424                 return (sifa);
 2425         }
 2426         if (resettotop == 0) {
 2427                 inp->next_addr_touse = NULL;
 2428                 goto once_again;
 2429         }
 2430         inp->next_addr_touse = starting_point;
 2431         resettotop = 0;
 2432 once_again_too:
 2433         if (inp->next_addr_touse == NULL) {
 2434                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2435                 resettotop = 1;
 2436         }
 2437         /* ok, what about an acceptable address in the inp */
 2438         for (laddr = inp->next_addr_touse; laddr;
 2439             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2440                 if (laddr->ifa == NULL) {
 2441                         /* address has been removed */
 2442                         continue;
 2443                 }
 2444                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2445                         /* address is being deleted */
 2446                         continue;
 2447                 }
 2448                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2449                     dest_is_priv, fam);
 2450                 if (sifa == NULL)
 2451                         continue;
 2452                 atomic_add_int(&sifa->refcount, 1);
 2453                 return (sifa);
 2454         }
 2455         if (resettotop == 0) {
 2456                 inp->next_addr_touse = NULL;
 2457                 goto once_again_too;
 2458         }
 2459         /*
 2460          * no address bound can be a source for the destination we are in
 2461          * trouble
 2462          */
 2463         return (NULL);
 2464 }
 2465 
 2466 
 2467 
 2468 static struct sctp_ifa *
 2469 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 2470     struct sctp_tcb *stcb,
 2471     struct sctp_nets *net,
 2472     sctp_route_t * ro,
 2473     uint32_t vrf_id,
 2474     uint8_t dest_is_priv,
 2475     uint8_t dest_is_loop,
 2476     int non_asoc_addr_ok,
 2477     sa_family_t fam)
 2478 {
 2479         struct sctp_laddr *laddr, *starting_point;
 2480         void *ifn;
 2481         struct sctp_ifn *sctp_ifn;
 2482         struct sctp_ifa *sctp_ifa, *sifa;
 2483         uint8_t start_at_beginning = 0;
 2484         struct sctp_vrf *vrf;
 2485         uint32_t ifn_index;
 2486 
 2487         /*
 2488          * first question, is the ifn we will emit on in our list, if so, we
 2489          * want that one.
 2490          */
 2491         vrf = sctp_find_vrf(vrf_id);
 2492         if (vrf == NULL)
 2493                 return (NULL);
 2494 
 2495         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2496         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2497         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2498 
 2499         /*
 2500          * first question, is the ifn we will emit on in our list?  If so,
 2501          * we want that one. First we look for a preferred. Second, we go
 2502          * for an acceptable.
 2503          */
 2504         if (sctp_ifn) {
 2505                 /* first try for a preferred address on the ep */
 2506                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2507                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2508                                 continue;
 2509                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2510                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2511                                 if (sifa == NULL)
 2512                                         continue;
 2513                                 if ((non_asoc_addr_ok == 0) &&
 2514                                     (sctp_is_addr_restricted(stcb, sifa))) {
 2515                                         /* on the no-no list */
 2516                                         continue;
 2517                                 }
 2518                                 atomic_add_int(&sifa->refcount, 1);
 2519                                 return (sifa);
 2520                         }
 2521                 }
 2522                 /* next try for an acceptable address on the ep */
 2523                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2524                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2525                                 continue;
 2526                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2527                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2528                                 if (sifa == NULL)
 2529                                         continue;
 2530                                 if ((non_asoc_addr_ok == 0) &&
 2531                                     (sctp_is_addr_restricted(stcb, sifa))) {
 2532                                         /* on the no-no list */
 2533                                         continue;
 2534                                 }
 2535                                 atomic_add_int(&sifa->refcount, 1);
 2536                                 return (sifa);
 2537                         }
 2538                 }
 2539 
 2540         }
 2541         /*
 2542          * if we can't find one like that then we must look at all addresses
 2543          * bound to pick one at first preferable then secondly acceptable.
 2544          */
 2545         starting_point = stcb->asoc.last_used_address;
 2546 sctp_from_the_top:
 2547         if (stcb->asoc.last_used_address == NULL) {
 2548                 start_at_beginning = 1;
 2549                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2550         }
 2551         /* search beginning with the last used address */
 2552         for (laddr = stcb->asoc.last_used_address; 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_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 2563                 if (sifa == NULL)
 2564                         continue;
 2565                 if ((non_asoc_addr_ok == 0) &&
 2566                     (sctp_is_addr_restricted(stcb, sifa))) {
 2567                         /* on the no-no list */
 2568                         continue;
 2569                 }
 2570                 stcb->asoc.last_used_address = laddr;
 2571                 atomic_add_int(&sifa->refcount, 1);
 2572                 return (sifa);
 2573         }
 2574         if (start_at_beginning == 0) {
 2575                 stcb->asoc.last_used_address = NULL;
 2576                 goto sctp_from_the_top;
 2577         }
 2578         /* now try for any higher scope than the destination */
 2579         stcb->asoc.last_used_address = starting_point;
 2580         start_at_beginning = 0;
 2581 sctp_from_the_top2:
 2582         if (stcb->asoc.last_used_address == NULL) {
 2583                 start_at_beginning = 1;
 2584                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2585         }
 2586         /* search beginning with the last used address */
 2587         for (laddr = stcb->asoc.last_used_address; laddr;
 2588             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2589                 if (laddr->ifa == NULL) {
 2590                         /* address has been removed */
 2591                         continue;
 2592                 }
 2593                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2594                         /* address is being deleted */
 2595                         continue;
 2596                 }
 2597                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2598                     dest_is_priv, fam);
 2599                 if (sifa == NULL)
 2600                         continue;
 2601                 if ((non_asoc_addr_ok == 0) &&
 2602                     (sctp_is_addr_restricted(stcb, sifa))) {
 2603                         /* on the no-no list */
 2604                         continue;
 2605                 }
 2606                 stcb->asoc.last_used_address = laddr;
 2607                 atomic_add_int(&sifa->refcount, 1);
 2608                 return (sifa);
 2609         }
 2610         if (start_at_beginning == 0) {
 2611                 stcb->asoc.last_used_address = NULL;
 2612                 goto sctp_from_the_top2;
 2613         }
 2614         return (NULL);
 2615 }
 2616 
 2617 static struct sctp_ifa *
 2618 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 2619     struct sctp_tcb *stcb,
 2620     int non_asoc_addr_ok,
 2621     uint8_t dest_is_loop,
 2622     uint8_t dest_is_priv,
 2623     int addr_wanted,
 2624     sa_family_t fam,
 2625     sctp_route_t * ro
 2626 )
 2627 {
 2628         struct sctp_ifa *ifa, *sifa;
 2629         int num_eligible_addr = 0;
 2630 
 2631         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2632                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2633                     (non_asoc_addr_ok == 0))
 2634                         continue;
 2635                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2636                     dest_is_priv, fam);
 2637                 if (sifa == NULL)
 2638                         continue;
 2639                 /*
 2640                  * Check if the IPv6 address matches to next-hop. In the
 2641                  * mobile case, old IPv6 address may be not deleted from the
 2642                  * interface. Then, the interface has previous and new
 2643                  * addresses.  We should use one corresponding to the
 2644                  * next-hop.  (by micchie)
 2645                  */
 2646                 if (stcb && fam == AF_INET6 &&
 2647                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2648                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
 2649                             == 0) {
 2650                                 continue;
 2651                         }
 2652                 }
 2653                 /* Avoid topologically incorrect IPv4 address */
 2654                 if (stcb && fam == AF_INET &&
 2655                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2656                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 2657                                 continue;
 2658                         }
 2659                 }
 2660                 if (stcb) {
 2661                         if ((non_asoc_addr_ok == 0) &&
 2662                             sctp_is_addr_restricted(stcb, sifa)) {
 2663                                 /*
 2664                                  * It is restricted for some reason..
 2665                                  * probably not yet added.
 2666                                  */
 2667                                 continue;
 2668                         }
 2669                 }
 2670                 if (num_eligible_addr >= addr_wanted) {
 2671                         return (sifa);
 2672                 }
 2673                 num_eligible_addr++;
 2674         }
 2675         return (NULL);
 2676 }
 2677 
 2678 
 2679 static int
 2680 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 2681     struct sctp_tcb *stcb,
 2682     int non_asoc_addr_ok,
 2683     uint8_t dest_is_loop,
 2684     uint8_t dest_is_priv,
 2685     sa_family_t fam)
 2686 {
 2687         struct sctp_ifa *ifa, *sifa;
 2688         int num_eligible_addr = 0;
 2689 
 2690         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2691                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2692                     (non_asoc_addr_ok == 0)) {
 2693                         continue;
 2694                 }
 2695                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2696                     dest_is_priv, fam);
 2697                 if (sifa == NULL) {
 2698                         continue;
 2699                 }
 2700                 if (stcb) {
 2701                         if ((non_asoc_addr_ok == 0) &&
 2702                             sctp_is_addr_restricted(stcb, sifa)) {
 2703                                 /*
 2704                                  * It is restricted for some reason..
 2705                                  * probably not yet added.
 2706                                  */
 2707                                 continue;
 2708                         }
 2709                 }
 2710                 num_eligible_addr++;
 2711         }
 2712         return (num_eligible_addr);
 2713 }
 2714 
 2715 static struct sctp_ifa *
 2716 sctp_choose_boundall(struct sctp_inpcb *inp,
 2717     struct sctp_tcb *stcb,
 2718     struct sctp_nets *net,
 2719     sctp_route_t * ro,
 2720     uint32_t vrf_id,
 2721     uint8_t dest_is_priv,
 2722     uint8_t dest_is_loop,
 2723     int non_asoc_addr_ok,
 2724     sa_family_t fam)
 2725 {
 2726         int cur_addr_num = 0, num_preferred = 0;
 2727         void *ifn;
 2728         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 2729         struct sctp_ifa *sctp_ifa, *sifa;
 2730         uint32_t ifn_index;
 2731         struct sctp_vrf *vrf;
 2732 
 2733         /*-
 2734          * For boundall we can use any address in the association.
 2735          * If non_asoc_addr_ok is set we can use any address (at least in
 2736          * theory). So we look for preferred addresses first. If we find one,
 2737          * we use it. Otherwise we next try to get an address on the
 2738          * interface, which we should be able to do (unless non_asoc_addr_ok
 2739          * is false and we are routed out that way). In these cases where we
 2740          * can't use the address of the interface we go through all the
 2741          * ifn's looking for an address we can use and fill that in. Punting
 2742          * means we send back address 0, which will probably cause problems
 2743          * actually since then IP will fill in the address of the route ifn,
 2744          * which means we probably already rejected it.. i.e. here comes an
 2745          * abort :-<.
 2746          */
 2747         vrf = sctp_find_vrf(vrf_id);
 2748         if (vrf == NULL)
 2749                 return (NULL);
 2750 
 2751         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2752         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2753         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2754         if (sctp_ifn == NULL) {
 2755                 /* ?? We don't have this guy ?? */
 2756                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 2757                 goto bound_all_plan_b;
 2758         }
 2759         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 2760             ifn_index, sctp_ifn->ifn_name);
 2761 
 2762         if (net) {
 2763                 cur_addr_num = net->indx_of_eligible_next_to_use;
 2764         }
 2765         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 2766             stcb,
 2767             non_asoc_addr_ok,
 2768             dest_is_loop,
 2769             dest_is_priv, fam);
 2770         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 2771             num_preferred, sctp_ifn->ifn_name);
 2772         if (num_preferred == 0) {
 2773                 /*
 2774                  * no eligible addresses, we must use some other interface
 2775                  * address if we can find one.
 2776                  */
 2777                 goto bound_all_plan_b;
 2778         }
 2779         /*
 2780          * Ok we have num_eligible_addr set with how many we can use, this
 2781          * may vary from call to call due to addresses being deprecated
 2782          * etc..
 2783          */
 2784         if (cur_addr_num >= num_preferred) {
 2785                 cur_addr_num = 0;
 2786         }
 2787         /*
 2788          * select the nth address from the list (where cur_addr_num is the
 2789          * nth) and 0 is the first one, 1 is the second one etc...
 2790          */
 2791         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 2792 
 2793         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
 2794             dest_is_priv, cur_addr_num, fam, ro);
 2795 
 2796         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 2797         if (sctp_ifa) {
 2798                 atomic_add_int(&sctp_ifa->refcount, 1);
 2799                 if (net) {
 2800                         /* save off where the next one we will want */
 2801                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 2802                 }
 2803                 return (sctp_ifa);
 2804         }
 2805         /*
 2806          * plan_b: Look at all interfaces and find a preferred address. If
 2807          * no preferred fall through to plan_c.
 2808          */
 2809 bound_all_plan_b:
 2810         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 2811         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 2812                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 2813                     sctp_ifn->ifn_name);
 2814                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 2815                         /* wrong base scope */
 2816                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 2817                         continue;
 2818                 }
 2819                 if ((sctp_ifn == looked_at) && looked_at) {
 2820                         /* already looked at this guy */
 2821                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 2822                         continue;
 2823                 }
 2824                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, stcb, non_asoc_addr_ok,
 2825                     dest_is_loop, dest_is_priv, fam);
 2826                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 2827                     "Found ifn:%p %d preferred source addresses\n",
 2828                     ifn, num_preferred);
 2829                 if (num_preferred == 0) {
 2830                         /* None on this interface. */
 2831                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
 2832                         continue;
 2833                 }
 2834                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 2835                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 2836                     num_preferred, sctp_ifn, cur_addr_num);
 2837 
 2838                 /*
 2839                  * Ok we have num_eligible_addr set with how many we can
 2840                  * use, this may vary from call to call due to addresses
 2841                  * being deprecated etc..
 2842                  */
 2843                 if (cur_addr_num >= num_preferred) {
 2844                         cur_addr_num = 0;
 2845                 }
 2846                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, stcb, non_asoc_addr_ok, dest_is_loop,
 2847                     dest_is_priv, cur_addr_num, fam, ro);
 2848                 if (sifa == NULL)
 2849                         continue;
 2850                 if (net) {
 2851                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 2852                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 2853                             cur_addr_num);
 2854                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 2855                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 2856                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 2857                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 2858                 }
 2859                 atomic_add_int(&sifa->refcount, 1);
 2860                 return (sifa);
 2861 
 2862         }
 2863 
 2864         /* plan_c: do we have an acceptable address on the emit interface */
 2865         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 2866         if (emit_ifn == NULL) {
 2867                 goto plan_d;
 2868         }
 2869         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 2870                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2871                     (non_asoc_addr_ok == 0))
 2872                         continue;
 2873                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 2874                     dest_is_priv, fam);
 2875                 if (sifa == NULL)
 2876                         continue;
 2877                 if (stcb) {
 2878                         if ((non_asoc_addr_ok == 0) &&
 2879                             sctp_is_addr_restricted(stcb, sifa)) {
 2880                                 /*
 2881                                  * It is restricted for some reason..
 2882                                  * probably not yet added.
 2883                                  */
 2884                                 continue;
 2885                         }
 2886                 }
 2887                 atomic_add_int(&sifa->refcount, 1);
 2888                 return (sifa);
 2889         }
 2890 plan_d:
 2891         /*
 2892          * plan_d: We are in trouble. No preferred address on the emit
 2893          * interface. And not even a preferred address on all interfaces. Go
 2894          * out and see if we can find an acceptable address somewhere
 2895          * amongst all interfaces.
 2896          */
 2897         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D\n");
 2898         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 2899                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 2900                         /* wrong base scope */
 2901                         continue;
 2902                 }
 2903                 if ((sctp_ifn == looked_at) && looked_at)
 2904                         /* already looked at this guy */
 2905                         continue;
 2906 
 2907                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2908                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2909                             (non_asoc_addr_ok == 0))
 2910                                 continue;
 2911                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 2912                             dest_is_loop,
 2913                             dest_is_priv, fam);
 2914                         if (sifa == NULL)
 2915                                 continue;
 2916                         if (stcb) {
 2917                                 if ((non_asoc_addr_ok == 0) &&
 2918                                     sctp_is_addr_restricted(stcb, sifa)) {
 2919                                         /*
 2920                                          * It is restricted for some
 2921                                          * reason.. probably not yet added.
 2922                                          */
 2923                                         continue;
 2924                                 }
 2925                         }
 2926                         atomic_add_int(&sifa->refcount, 1);
 2927                         return (sifa);
 2928                 }
 2929         }
 2930         /*
 2931          * Ok we can find NO address to source from that is not on our
 2932          * restricted list and non_asoc_address is NOT ok, or it is on our
 2933          * restricted list. We can't source to it :-(
 2934          */
 2935         return (NULL);
 2936 }
 2937 
 2938 
 2939 
 2940 /* tcb may be NULL */
 2941 struct sctp_ifa *
 2942 sctp_source_address_selection(struct sctp_inpcb *inp,
 2943     struct sctp_tcb *stcb,
 2944     sctp_route_t * ro,
 2945     struct sctp_nets *net,
 2946     int non_asoc_addr_ok, uint32_t vrf_id)
 2947 {
 2948         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 2949         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 2950         struct sctp_ifa *answer;
 2951         uint8_t dest_is_priv, dest_is_loop;
 2952         sa_family_t fam;
 2953 
 2954         /*-
 2955          * Rules: - Find the route if needed, cache if I can. - Look at
 2956          * interface address in route, Is it in the bound list. If so we
 2957          * have the best source. - If not we must rotate amongst the
 2958          * addresses.
 2959          *
 2960          * Cavets and issues
 2961          *
 2962          * Do we need to pay attention to scope. We can have a private address
 2963          * or a global address we are sourcing or sending to. So if we draw
 2964          * it out
 2965          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 2966          * For V4
 2967          *------------------------------------------
 2968          *      source     *      dest  *  result
 2969          * -----------------------------------------
 2970          * <a>  Private    *    Global  *  NAT
 2971          * -----------------------------------------
 2972          * <b>  Private    *    Private *  No problem
 2973          * -----------------------------------------
 2974          * <c>  Global     *    Private *  Huh, How will this work?
 2975          * -----------------------------------------
 2976          * <d>  Global     *    Global  *  No Problem
 2977          *------------------------------------------
 2978          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 2979          * For V6
 2980          *------------------------------------------
 2981          *      source     *      dest  *  result
 2982          * -----------------------------------------
 2983          * <a>  Linklocal  *    Global  *
 2984          * -----------------------------------------
 2985          * <b>  Linklocal  * Linklocal  *  No problem
 2986          * -----------------------------------------
 2987          * <c>  Global     * Linklocal  *  Huh, How will this work?
 2988          * -----------------------------------------
 2989          * <d>  Global     *    Global  *  No Problem
 2990          *------------------------------------------
 2991          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 2992          *
 2993          * And then we add to that what happens if there are multiple addresses
 2994          * assigned to an interface. Remember the ifa on a ifn is a linked
 2995          * list of addresses. So one interface can have more than one IP
 2996          * address. What happens if we have both a private and a global
 2997          * address? Do we then use context of destination to sort out which
 2998          * one is best? And what about NAT's sending P->G may get you a NAT
 2999          * translation, or should you select the G thats on the interface in
 3000          * preference.
 3001          *
 3002          * Decisions:
 3003          *
 3004          * - count the number of addresses on the interface.
 3005          * - if it is one, no problem except case <c>.
 3006          *   For <a> we will assume a NAT out there.
 3007          * - if there are more than one, then we need to worry about scope P
 3008          *   or G. We should prefer G -> G and P -> P if possible.
 3009          *   Then as a secondary fall back to mixed types G->P being a last
 3010          *   ditch one.
 3011          * - The above all works for bound all, but bound specific we need to
 3012          *   use the same concept but instead only consider the bound
 3013          *   addresses. If the bound set is NOT assigned to the interface then
 3014          *   we must use rotation amongst the bound addresses..
 3015          */
 3016         if (ro->ro_rt == NULL) {
 3017                 /*
 3018                  * Need a route to cache.
 3019                  */
 3020                 SCTP_RTALLOC(ro, vrf_id);
 3021         }
 3022         if (ro->ro_rt == NULL) {
 3023                 return (NULL);
 3024         }
 3025         fam = to->sin_family;
 3026         dest_is_priv = dest_is_loop = 0;
 3027         /* Setup our scopes for the destination */
 3028         if (fam == AF_INET) {
 3029                 /* Scope based on outbound address */
 3030                 if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 3031                         dest_is_priv = 1;
 3032                 } else if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 3033                         dest_is_loop = 1;
 3034                         if (net != NULL) {
 3035                                 /* mark it as local */
 3036                                 net->addr_is_local = 1;
 3037                         }
 3038                 }
 3039         } else if (fam == AF_INET6) {
 3040                 /* Scope based on outbound address */
 3041                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
 3042                         /*
 3043                          * If the route goes to the loopback address OR the
 3044                          * address is a loopback address, we are loopback
 3045                          * scope. But we don't use dest_is_priv (link local
 3046                          * addresses).
 3047                          */
 3048                         dest_is_loop = 1;
 3049                         if (net != NULL) {
 3050                                 /* mark it as local */
 3051                                 net->addr_is_local = 1;
 3052                         }
 3053                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 3054                         dest_is_priv = 1;
 3055                 }
 3056         }
 3057         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 3058         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)to);
 3059         SCTP_IPI_ADDR_RLOCK();
 3060         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3061                 /*
 3062                  * Bound all case
 3063                  */
 3064                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 3065                     dest_is_priv, dest_is_loop,
 3066                     non_asoc_addr_ok, fam);
 3067                 SCTP_IPI_ADDR_RUNLOCK();
 3068                 return (answer);
 3069         }
 3070         /*
 3071          * Subset bound case
 3072          */
 3073         if (stcb) {
 3074                 answer = sctp_choose_boundspecific_stcb(inp, stcb, net, ro,
 3075                     vrf_id, dest_is_priv,
 3076                     dest_is_loop,
 3077                     non_asoc_addr_ok, fam);
 3078         } else {
 3079                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 3080                     non_asoc_addr_ok,
 3081                     dest_is_priv,
 3082                     dest_is_loop, fam);
 3083         }
 3084         SCTP_IPI_ADDR_RUNLOCK();
 3085         return (answer);
 3086 }
 3087 
 3088 static int
 3089 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, int cpsize)
 3090 {
 3091         struct cmsghdr cmh;
 3092         int tlen, at;
 3093 
 3094         tlen = SCTP_BUF_LEN(control);
 3095         at = 0;
 3096         /*
 3097          * Independent of how many mbufs, find the c_type inside the control
 3098          * structure and copy out the data.
 3099          */
 3100         while (at < tlen) {
 3101                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3102                         /* not enough room for one more we are done. */
 3103                         return (0);
 3104                 }
 3105                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3106                 if (((int)cmh.cmsg_len + at) > tlen) {
 3107                         /*
 3108                          * this is real messed up since there is not enough
 3109                          * data here to cover the cmsg header. We are done.
 3110                          */
 3111                         return (0);
 3112                 }
 3113                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 3114                     (c_type == cmh.cmsg_type)) {
 3115                         /* found the one we want, copy it out */
 3116                         at += CMSG_ALIGN(sizeof(struct cmsghdr));
 3117                         if ((int)(cmh.cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr))) < cpsize) {
 3118                                 /*
 3119                                  * space of cmsg_len after header not big
 3120                                  * enough
 3121                                  */
 3122                                 return (0);
 3123                         }
 3124                         m_copydata(control, at, cpsize, data);
 3125                         return (1);
 3126                 } else {
 3127                         at += CMSG_ALIGN(cmh.cmsg_len);
 3128                         if (cmh.cmsg_len == 0) {
 3129                                 break;
 3130                         }
 3131                 }
 3132         }
 3133         /* not found */
 3134         return (0);
 3135 }
 3136 
 3137 static struct mbuf *
 3138 sctp_add_cookie(struct sctp_inpcb *inp, struct mbuf *init, int init_offset,
 3139     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
 3140 {
 3141         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
 3142         struct sctp_state_cookie *stc;
 3143         struct sctp_paramhdr *ph;
 3144         uint8_t *foo;
 3145         int sig_offset;
 3146         uint16_t cookie_sz;
 3147 
 3148         mret = NULL;
 3149         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 3150             sizeof(struct sctp_paramhdr)), 0,
 3151             M_DONTWAIT, 1, MT_DATA);
 3152         if (mret == NULL) {
 3153                 return (NULL);
 3154         }
 3155         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_DONTWAIT);
 3156         if (copy_init == NULL) {
 3157                 sctp_m_freem(mret);
 3158                 return (NULL);
 3159         }
 3160         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 3161             M_DONTWAIT);
 3162         if (copy_initack == NULL) {
 3163                 sctp_m_freem(mret);
 3164                 sctp_m_freem(copy_init);
 3165                 return (NULL);
 3166         }
 3167         /* easy side we just drop it on the end */
 3168         ph = mtod(mret, struct sctp_paramhdr *);
 3169         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 3170             sizeof(struct sctp_paramhdr);
 3171         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 3172             sizeof(struct sctp_paramhdr));
 3173         ph->param_type = htons(SCTP_STATE_COOKIE);
 3174         ph->param_length = 0;   /* fill in at the end */
 3175         /* Fill in the stc cookie data */
 3176         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 3177 
 3178         /* tack the INIT and then the INIT-ACK onto the chain */
 3179         cookie_sz = 0;
 3180         m_at = mret;
 3181         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3182                 cookie_sz += SCTP_BUF_LEN(m_at);
 3183                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3184                         SCTP_BUF_NEXT(m_at) = copy_init;
 3185                         break;
 3186                 }
 3187         }
 3188 
 3189         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3190                 cookie_sz += SCTP_BUF_LEN(m_at);
 3191                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3192                         SCTP_BUF_NEXT(m_at) = copy_initack;
 3193                         break;
 3194                 }
 3195         }
 3196 
 3197         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3198                 cookie_sz += SCTP_BUF_LEN(m_at);
 3199                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3200                         break;
 3201                 }
 3202         }
 3203         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_DONTWAIT, 1, MT_DATA);
 3204         if (sig == NULL) {
 3205                 /* no space, so free the entire chain */
 3206                 sctp_m_freem(mret);
 3207                 return (NULL);
 3208         }
 3209         SCTP_BUF_LEN(sig) = 0;
 3210         SCTP_BUF_NEXT(m_at) = sig;
 3211         sig_offset = 0;
 3212         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
 3213         memset(foo, 0, SCTP_SIGNATURE_SIZE);
 3214         *signature = foo;
 3215         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
 3216         cookie_sz += SCTP_SIGNATURE_SIZE;
 3217         ph->param_length = htons(cookie_sz);
 3218         return (mret);
 3219 }
 3220 
 3221 
 3222 static uint8_t
 3223 sctp_get_ect(struct sctp_tcb *stcb,
 3224     struct sctp_tmit_chunk *chk)
 3225 {
 3226         uint8_t this_random;
 3227 
 3228         /* Huh? */
 3229         if (sctp_ecn_enable == 0)
 3230                 return (0);
 3231 
 3232         if (sctp_ecn_nonce == 0)
 3233                 /* no nonce, always return ECT0 */
 3234                 return (SCTP_ECT0_BIT);
 3235 
 3236         if (stcb->asoc.peer_supports_ecn_nonce == 0) {
 3237                 /* Peer does NOT support it, so we send a ECT0 only */
 3238                 return (SCTP_ECT0_BIT);
 3239         }
 3240         if (chk == NULL)
 3241                 return (SCTP_ECT0_BIT);
 3242 
 3243         if ((stcb->asoc.hb_random_idx > 3) ||
 3244             ((stcb->asoc.hb_random_idx == 3) &&
 3245             (stcb->asoc.hb_ect_randombit > 7))) {
 3246                 uint32_t rndval;
 3247 
 3248 warp_drive_sa:
 3249                 rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 3250                 memcpy(stcb->asoc.hb_random_values, &rndval,
 3251                     sizeof(stcb->asoc.hb_random_values));
 3252                 this_random = stcb->asoc.hb_random_values[0];
 3253                 stcb->asoc.hb_random_idx = 0;
 3254                 stcb->asoc.hb_ect_randombit = 0;
 3255         } else {
 3256                 if (stcb->asoc.hb_ect_randombit > 7) {
 3257                         stcb->asoc.hb_ect_randombit = 0;
 3258                         stcb->asoc.hb_random_idx++;
 3259                         if (stcb->asoc.hb_random_idx > 3) {
 3260                                 goto warp_drive_sa;
 3261                         }
 3262                 }
 3263                 this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
 3264         }
 3265         if ((this_random >> stcb->asoc.hb_ect_randombit) & 0x01) {
 3266                 if (chk != NULL)
 3267                         /* ECN Nonce stuff */
 3268                         chk->rec.data.ect_nonce = SCTP_ECT1_BIT;
 3269                 stcb->asoc.hb_ect_randombit++;
 3270                 return (SCTP_ECT1_BIT);
 3271         } else {
 3272                 stcb->asoc.hb_ect_randombit++;
 3273                 return (SCTP_ECT0_BIT);
 3274         }
 3275 }
 3276 
 3277 static int
 3278 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 3279     struct sctp_tcb *stcb,      /* may be NULL */
 3280     struct sctp_nets *net,
 3281     struct sockaddr *to,
 3282     struct mbuf *m,
 3283     uint32_t auth_offset,
 3284     struct sctp_auth_chunk *auth,
 3285     int nofragment_flag,
 3286     int ecn_ok,
 3287     struct sctp_tmit_chunk *chk,
 3288     int out_of_asoc_ok,
 3289     int so_locked
 3290 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 3291     SCTP_UNUSED
 3292 #endif
 3293 )
 3294 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 3295 {
 3296         /*
 3297          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet
 3298          * header WITH an SCTPHDR but no IP header, endpoint inp and sa
 3299          * structure: - fill in the HMAC digest of any AUTH chunk in the
 3300          * packet. - calculate and fill in the SCTP checksum. - prepend an
 3301          * IP address header. - if boundall use INADDR_ANY. - if
 3302          * boundspecific do source address selection. - set fragmentation
 3303          * option for ipV4. - On return from IP output, check/adjust mtu
 3304          * size of output interface and smallest_mtu size as well.
 3305          */
 3306         /* Will need ifdefs around this */
 3307         struct mbuf *o_pak;
 3308         struct mbuf *newm;
 3309         struct sctphdr *sctphdr;
 3310         int packet_length;
 3311         uint32_t csum;
 3312         int ret;
 3313         uint32_t vrf_id;
 3314         sctp_route_t *ro = NULL;
 3315 
 3316         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 3317                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 3318                 sctp_m_freem(m);
 3319                 return (EFAULT);
 3320         }
 3321         if (stcb) {
 3322                 vrf_id = stcb->asoc.vrf_id;
 3323         } else {
 3324                 vrf_id = inp->def_vrf_id;
 3325         }
 3326 
 3327         /* fill in the HMAC digest for any AUTH chunk in the packet */
 3328         if ((auth != NULL) && (stcb != NULL)) {
 3329                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb);
 3330         }
 3331         /* Calculate the csum and fill in the length of the packet */
 3332         sctphdr = mtod(m, struct sctphdr *);
 3333         if (sctp_no_csum_on_loopback &&
 3334             (stcb) &&
 3335             (to->sa_family == AF_INET) &&
 3336             (stcb->asoc.loopback_scope)) {
 3337                 sctphdr->checksum = 0;
 3338                 /*
 3339                  * This can probably now be taken out since my audit shows
 3340                  * no more bad pktlen's coming in. But we will wait a while
 3341                  * yet.
 3342                  */
 3343                 packet_length = sctp_calculate_len(m);
 3344         } else {
 3345                 sctphdr->checksum = 0;
 3346                 csum = sctp_calculate_sum(m, &packet_length, 0);
 3347                 sctphdr->checksum = csum;
 3348         }
 3349 
 3350         if (to->sa_family == AF_INET) {
 3351                 struct ip *ip = NULL;
 3352                 sctp_route_t iproute;
 3353                 uint8_t tos_value;
 3354 
 3355                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip), 1, M_DONTWAIT, 1, MT_DATA);
 3356                 if (newm == NULL) {
 3357                         sctp_m_freem(m);
 3358                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 3359                         return (ENOMEM);
 3360                 }
 3361                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip));
 3362                 SCTP_BUF_LEN(newm) = sizeof(struct ip);
 3363                 packet_length += sizeof(struct ip);
 3364                 SCTP_BUF_NEXT(newm) = m;
 3365                 m = newm;
 3366                 ip = mtod(m, struct ip *);
 3367                 ip->ip_v = IPVERSION;
 3368                 ip->ip_hl = (sizeof(struct ip) >> 2);
 3369                 if (net) {
 3370                         tos_value = net->tos_flowlabel & 0x000000ff;
 3371                 } else {
 3372                         tos_value = inp->ip_inp.inp.inp_ip_tos;
 3373                 }
 3374                 if (nofragment_flag) {
 3375 #if defined(WITH_CONVERT_IP_OFF) || defined(__FreeBSD__) || defined(__APPLE__)
 3376                         ip->ip_off = IP_DF;
 3377 #else
 3378                         ip->ip_off = htons(IP_DF);
 3379 #endif
 3380                 } else
 3381                         ip->ip_off = 0;
 3382 
 3383                 /* FreeBSD has a function for ip_id's */
 3384                 ip->ip_id = ip_newid();
 3385 
 3386                 ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 3387                 ip->ip_len = packet_length;
 3388                 if (stcb) {
 3389                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
 3390                                 /* Enable ECN */
 3391                                 ip->ip_tos = ((u_char)(tos_value & 0xfc) | sctp_get_ect(stcb, chk));
 3392                         } else {
 3393                                 /* No ECN */
 3394                                 ip->ip_tos = (u_char)(tos_value & 0xfc);
 3395                         }
 3396                 } else {
 3397                         /* no association at all */
 3398                         ip->ip_tos = (tos_value & 0xfc);
 3399                 }
 3400                 ip->ip_p = IPPROTO_SCTP;
 3401                 ip->ip_sum = 0;
 3402                 if (net == NULL) {
 3403                         ro = &iproute;
 3404                         memset(&iproute, 0, sizeof(iproute));
 3405                         memcpy(&ro->ro_dst, to, to->sa_len);
 3406                 } else {
 3407                         ro = (sctp_route_t *) & net->ro;
 3408                 }
 3409                 /* Now the address selection part */
 3410                 ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 3411 
 3412                 /* call the routine to select the src address */
 3413                 if (net) {
 3414                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 3415                                 sctp_free_ifa(net->ro._s_addr);
 3416                                 net->ro._s_addr = NULL;
 3417                                 net->src_addr_selected = 0;
 3418                                 if (ro->ro_rt) {
 3419                                         RTFREE(ro->ro_rt);
 3420                                         ro->ro_rt = NULL;
 3421                                 }
 3422                         }
 3423                         if (net->src_addr_selected == 0) {
 3424                                 if (out_of_asoc_ok) {
 3425                                         /* do not cache */
 3426                                         goto temp_v4_src;
 3427                                 }
 3428                                 /* Cache the source address */
 3429                                 net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 3430                                     ro, net, out_of_asoc_ok,
 3431                                     vrf_id);
 3432                                 net->src_addr_selected = 1;
 3433                         }
 3434                         if (net->ro._s_addr == NULL) {
 3435                                 /* No route to host */
 3436                                 net->src_addr_selected = 0;
 3437                                 goto no_route;
 3438                         }
 3439                         ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 3440                 } else {
 3441                         struct sctp_ifa *_lsrc;
 3442 
 3443         temp_v4_src:
 3444                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 3445                             net,
 3446                             out_of_asoc_ok,
 3447                             vrf_id);
 3448                         if (_lsrc == NULL) {
 3449                                 goto no_route;
 3450                         }
 3451                         ip->ip_src = _lsrc->address.sin.sin_addr;
 3452                         sctp_free_ifa(_lsrc);
 3453                 }
 3454 
 3455                 /*
 3456                  * If source address selection fails and we find no route
 3457                  * then the ip_output should fail as well with a
 3458                  * NO_ROUTE_TO_HOST type error. We probably should catch
 3459                  * that somewhere and abort the association right away
 3460                  * (assuming this is an INIT being sent).
 3461                  */
 3462                 if ((ro->ro_rt == NULL)) {
 3463                         /*
 3464                          * src addr selection failed to find a route (or
 3465                          * valid source addr), so we can't get there from
 3466                          * here (yet)!
 3467                          */
 3468         no_route:
 3469                         SCTPDBG(SCTP_DEBUG_OUTPUT1,
 3470                             "%s: dropped packet - no valid source addr\n",
 3471                             __FUNCTION__);
 3472                         if (net) {
 3473                                 SCTPDBG(SCTP_DEBUG_OUTPUT1,
 3474                                     "Destination was ");
 3475                                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1,
 3476                                     &net->ro._l_addr.sa);
 3477                                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 3478                                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 3479                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", net);
 3480                                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 3481                                                     stcb,
 3482                                                     SCTP_FAILED_THRESHOLD,
 3483                                                     (void *)net,
 3484                                                     so_locked);
 3485                                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 3486                                                 net->dest_state |= SCTP_ADDR_NOT_REACHABLE;
 3487                                                 /*
 3488                                                  * JRS 5/14/07 - If a
 3489                                                  * destination is
 3490                                                  * unreachable, the PF bit
 3491                                                  * is turned off.  This
 3492                                                  * allows an unambiguous use
 3493                                                  * of the PF bit for
 3494                                                  * destinations that are
 3495                                                  * reachable but potentially
 3496                                                  * failed. If the
 3497                                                  * destination is set to the
 3498                                                  * unreachable state, also
 3499                                                  * set the destination to
 3500                                                  * the PF state.
 3501                                                  */
 3502                                                 /*
 3503                                                  * Add debug message here if
 3504                                                  * destination is not in PF
 3505                                                  * state.
 3506                                                  */
 3507                                                 /*
 3508                                                  * Stop any running T3
 3509                                                  * timers here?
 3510                                                  */
 3511                                                 if (sctp_cmt_on_off && sctp_cmt_pf) {
 3512                                                         net->dest_state &= ~SCTP_ADDR_PF;
 3513                                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination %p moved from PF to unreachable.\n",
 3514                                                             net);
 3515                                                 }
 3516                                         }
 3517                                 }
 3518                                 if (stcb) {
 3519                                         if (net == stcb->asoc.primary_destination) {
 3520                                                 /* need a new primary */
 3521                                                 struct sctp_nets *alt;
 3522 
 3523                                                 alt = sctp_find_alternate_net(stcb, net, 0);
 3524                                                 if (alt != net) {
 3525                                                         if (sctp_set_primary_addr(stcb,
 3526                                                             (struct sockaddr *)NULL,
 3527                                                             alt) == 0) {
 3528                                                                 net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
 3529                                                                 if (net->ro._s_addr) {
 3530                                                                         sctp_free_ifa(net->ro._s_addr);
 3531                                                                         net->ro._s_addr = NULL;
 3532                                                                 }
 3533                                                                 net->src_addr_selected = 0;
 3534                                                         }
 3535                                                 }
 3536                                         }
 3537                                 }
 3538                         }
 3539                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 3540                         sctp_m_freem(m);
 3541                         return (EHOSTUNREACH);
 3542                 }
 3543                 if (ro != &iproute) {
 3544                         memcpy(&iproute, ro, sizeof(*ro));
 3545                 }
 3546                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 3547                     (uint32_t) (ntohl(ip->ip_src.s_addr)));
 3548                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 3549                     (uint32_t) (ntohl(ip->ip_dst.s_addr)));
 3550                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 3551                     ro->ro_rt);
 3552 
 3553                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 3554                         /* failed to prepend data, give up */
 3555                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 3556                         sctp_m_freem(m);
 3557                         return (ENOMEM);
 3558                 }
 3559 #ifdef  SCTP_PACKET_LOGGING
 3560                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
 3561                         sctp_packet_log(m, packet_length);
 3562 #endif
 3563                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 3564 
 3565                 /* send it out.  table id is taken from stcb */
 3566                 SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
 3567 
 3568                 SCTP_STAT_INCR(sctps_sendpackets);
 3569                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 3570                 if (ret)
 3571                         SCTP_STAT_INCR(sctps_senderrors);
 3572 
 3573                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 3574                 if (net == NULL) {
 3575                         /* free tempy routes */
 3576                         if (ro->ro_rt) {
 3577                                 RTFREE(ro->ro_rt);
 3578                                 ro->ro_rt = NULL;
 3579                         }
 3580                 } else {
 3581                         /* PMTU check versus smallest asoc MTU goes here */
 3582                         if ((ro->ro_rt != NULL) &&
 3583                             (net->ro._s_addr)) {
 3584                                 uint32_t mtu;
 3585 
 3586                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 3587                                 if (mtu &&
 3588                                     (stcb->asoc.smallest_mtu > mtu)) {
 3589 #ifdef SCTP_PRINT_FOR_B_AND_M
 3590                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip_output mtu-change:%d\n",
 3591                                             mtu);
 3592 #endif
 3593                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 3594                                         net->mtu = mtu;
 3595                                 }
 3596                         } else if (ro->ro_rt == NULL) {
 3597                                 /* route was freed */
 3598                                 if (net->ro._s_addr &&
 3599                                     net->src_addr_selected) {
 3600                                         sctp_free_ifa(net->ro._s_addr);
 3601                                         net->ro._s_addr = NULL;
 3602                                 }
 3603                                 net->src_addr_selected = 0;
 3604                         }
 3605                 }
 3606                 return (ret);
 3607         }
 3608 #ifdef INET6
 3609         else if (to->sa_family == AF_INET6) {
 3610                 uint32_t flowlabel;
 3611                 struct ip6_hdr *ip6h;
 3612                 struct route_in6 ip6route;
 3613                 struct ifnet *ifp;
 3614                 u_char flowTop;
 3615                 uint16_t flowBottom;
 3616                 u_char tosBottom, tosTop;
 3617                 struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 3618                 int prev_scope = 0;
 3619                 struct sockaddr_in6 lsa6_storage;
 3620                 int error;
 3621                 u_short prev_port = 0;
 3622 
 3623                 if (net != NULL) {
 3624                         flowlabel = net->tos_flowlabel;
 3625                 } else {
 3626                         flowlabel = ((struct in6pcb *)inp)->in6p_flowinfo;
 3627                 }
 3628 
 3629                 newm = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
 3630                 if (newm == NULL) {
 3631                         sctp_m_freem(m);
 3632                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 3633                         return (ENOMEM);
 3634                 }
 3635                 SCTP_ALIGN_TO_END(newm, sizeof(struct ip6_hdr));
 3636                 SCTP_BUF_LEN(newm) = sizeof(struct ip6_hdr);
 3637                 packet_length += sizeof(struct ip6_hdr);
 3638                 SCTP_BUF_NEXT(newm) = m;
 3639                 m = newm;
 3640 
 3641                 ip6h = mtod(m, struct ip6_hdr *);
 3642                 /*
 3643                  * We assume here that inp_flow is in host byte order within
 3644                  * the TCB!
 3645                  */
 3646                 flowBottom = flowlabel & 0x0000ffff;
 3647                 flowTop = ((flowlabel & 0x000f0000) >> 16);
 3648                 tosTop = (((flowlabel & 0xf0) >> 4) | IPV6_VERSION);
 3649                 /* protect *sin6 from overwrite */
 3650                 sin6 = (struct sockaddr_in6 *)to;
 3651                 tmp = *sin6;
 3652                 sin6 = &tmp;
 3653 
 3654                 /* KAME hack: embed scopeid */
 3655                 if (sa6_embedscope(sin6, ip6_use_defzone) != 0) {
 3656                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 3657                         return (EINVAL);
 3658                 }
 3659                 if (net == NULL) {
 3660                         memset(&ip6route, 0, sizeof(ip6route));
 3661                         ro = (sctp_route_t *) & ip6route;
 3662                         memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 3663                 } else {
 3664                         ro = (sctp_route_t *) & net->ro;
 3665                 }
 3666                 if (stcb != NULL) {
 3667                         if ((stcb->asoc.ecn_allowed) && ecn_ok) {
 3668                                 /* Enable ECN */
 3669                                 tosBottom = (((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) | sctp_get_ect(stcb, chk)) << 4);
 3670                         } else {
 3671                                 /* No ECN */
 3672                                 tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
 3673                         }
 3674                 } else {
 3675                         /* we could get no asoc if it is a O-O-T-B packet */
 3676                         tosBottom = ((((struct in6pcb *)inp)->in6p_flowinfo & 0x0c) << 4);
 3677                 }
 3678                 ip6h->ip6_flow = htonl(((tosTop << 24) | ((tosBottom | flowTop) << 16) | flowBottom));
 3679                 ip6h->ip6_nxt = IPPROTO_SCTP;
 3680                 ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
 3681                 ip6h->ip6_dst = sin6->sin6_addr;
 3682 
 3683                 /*
 3684                  * Add SRC address selection here: we can only reuse to a
 3685                  * limited degree the kame src-addr-sel, since we can try
 3686                  * their selection but it may not be bound.
 3687                  */
 3688                 bzero(&lsa6_tmp, sizeof(lsa6_tmp));
 3689                 lsa6_tmp.sin6_family = AF_INET6;
 3690                 lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 3691                 lsa6 = &lsa6_tmp;
 3692                 if (net) {
 3693                         if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 3694                                 sctp_free_ifa(net->ro._s_addr);
 3695                                 net->ro._s_addr = NULL;
 3696                                 net->src_addr_selected = 0;
 3697                                 if (ro->ro_rt) {
 3698                                         RTFREE(ro->ro_rt);
 3699                                         ro->ro_rt = NULL;
 3700                                 }
 3701                         }
 3702                         if (net->src_addr_selected == 0) {
 3703                                 if (out_of_asoc_ok) {
 3704                                         /* do not cache */
 3705                                         goto temp_v6_src;
 3706                                 }
 3707                                 /* Cache the source address */
 3708                                 net->ro._s_addr = sctp_source_address_selection(inp,
 3709                                     stcb,
 3710                                     ro,
 3711                                     net,
 3712                                     out_of_asoc_ok,
 3713                                     vrf_id);
 3714                                 net->src_addr_selected = 1;
 3715                         }
 3716                         if (net->ro._s_addr == NULL) {
 3717                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 3718                                 net->src_addr_selected = 0;
 3719                                 goto no_route;
 3720                         }
 3721                         lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 3722                 } else {
 3723                         struct sctp_ifa *_lsrc;
 3724 
 3725         temp_v6_src:
 3726                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 3727                             net,
 3728                             out_of_asoc_ok,
 3729                             vrf_id);
 3730                         if (_lsrc == NULL) {
 3731                                 goto no_route;
 3732                         }
 3733                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 3734                         sctp_free_ifa(_lsrc);
 3735                 }
 3736                 lsa6->sin6_port = inp->sctp_lport;
 3737 
 3738                 if ((ro->ro_rt == NULL)) {
 3739                         /*
 3740                          * src addr selection failed to find a route (or
 3741                          * valid source addr), so we can't get there from
 3742                          * here!
 3743                          */
 3744                         goto no_route;
 3745                 }
 3746                 /*
 3747                  * XXX: sa6 may not have a valid sin6_scope_id in the
 3748                  * non-SCOPEDROUTING case.
 3749                  */
 3750                 bzero(&lsa6_storage, sizeof(lsa6_storage));
 3751                 lsa6_storage.sin6_family = AF_INET6;
 3752                 lsa6_storage.sin6_len = sizeof(lsa6_storage);
 3753                 if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 3754                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 3755                         sctp_m_freem(m);
 3756                         return (error);
 3757                 }
 3758                 /* XXX */
 3759                 lsa6_storage.sin6_addr = lsa6->sin6_addr;
 3760                 lsa6_storage.sin6_port = inp->sctp_lport;
 3761                 lsa6 = &lsa6_storage;
 3762                 ip6h->ip6_src = lsa6->sin6_addr;
 3763 
 3764                 /*
 3765                  * We set the hop limit now since there is a good chance
 3766                  * that our ro pointer is now filled
 3767                  */
 3768                 ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 3769                 ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 3770 
 3771 #ifdef SCTP_DEBUG
 3772                 /* Copy to be sure something bad is not happening */
 3773                 sin6->sin6_addr = ip6h->ip6_dst;
 3774                 lsa6->sin6_addr = ip6h->ip6_src;
 3775 #endif
 3776 
 3777                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 3778                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 3779                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 3780                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 3781                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 3782                 if (net) {
 3783                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 3784                         /* preserve the port and scope for link local send */
 3785                         prev_scope = sin6->sin6_scope_id;
 3786                         prev_port = sin6->sin6_port;
 3787                 }
 3788                 if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 3789                         /* failed to prepend data, give up */
 3790                         sctp_m_freem(m);
 3791                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 3792                         return (ENOMEM);
 3793                 }
 3794 #ifdef  SCTP_PACKET_LOGGING
 3795                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
 3796                         sctp_packet_log(m, packet_length);
 3797 #endif
 3798                 SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 3799 
 3800                 /* send it out. table id is taken from stcb */
 3801                 SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp,
 3802                     stcb, vrf_id);
 3803 
 3804                 if (net) {
 3805                         /* for link local this must be done */
 3806                         sin6->sin6_scope_id = prev_scope;
 3807                         sin6->sin6_port = prev_port;
 3808                 }
 3809                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 3810                 SCTP_STAT_INCR(sctps_sendpackets);
 3811                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 3812                 if (ret) {
 3813                         SCTP_STAT_INCR(sctps_senderrors);
 3814                 }
 3815                 if (net == NULL) {
 3816                         /* Now if we had a temp route free it */
 3817                         if (ro->ro_rt) {
 3818                                 RTFREE(ro->ro_rt);
 3819                         }
 3820                 } else {
 3821                         /* PMTU check versus smallest asoc MTU goes here */
 3822                         if (ro->ro_rt == NULL) {
 3823                                 /* Route was freed */
 3824                                 if (net->ro._s_addr &&
 3825                                     net->src_addr_selected) {
 3826                                         sctp_free_ifa(net->ro._s_addr);
 3827                                         net->ro._s_addr = NULL;
 3828                                 }
 3829                                 net->src_addr_selected = 0;
 3830                         }
 3831                         if ((ro->ro_rt != NULL) &&
 3832                             (net->ro._s_addr)) {
 3833                                 uint32_t mtu;
 3834 
 3835                                 mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 3836                                 if (mtu &&
 3837                                     (stcb->asoc.smallest_mtu > mtu)) {
 3838 #ifdef SCTP_PRINT_FOR_B_AND_M
 3839                                         SCTP_PRINTF("sctp_mtu_size_reset called after ip6_output mtu-change:%d\n",
 3840                                             mtu);
 3841 #endif
 3842                                         sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 3843                                         net->mtu = mtu;
 3844                                 }
 3845                         } else if (ifp) {
 3846                                 if (ND_IFINFO(ifp)->linkmtu &&
 3847                                     (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 3848 #ifdef SCTP_PRINT_FOR_B_AND_M
 3849                                         SCTP_PRINTF("sctp_mtu_size_reset called via ifp ND_IFINFO() linkmtu:%d\n",
 3850                                             ND_IFINFO(ifp)->linkmtu);
 3851 #endif
 3852                                         sctp_mtu_size_reset(inp,
 3853                                             &stcb->asoc,
 3854                                             ND_IFINFO(ifp)->linkmtu);
 3855                                 }
 3856                         }
 3857                 }
 3858                 return (ret);
 3859         }
 3860 #endif
 3861         else {
 3862                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 3863                     ((struct sockaddr *)to)->sa_family);
 3864                 sctp_m_freem(m);
 3865                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 3866                 return (EFAULT);
 3867         }
 3868 }
 3869 
 3870 
 3871 void
 3872 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
 3873 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 3874     SCTP_UNUSED
 3875 #endif
 3876 )
 3877 {
 3878         struct mbuf *m, *m_at, *mp_last;
 3879         struct sctp_nets *net;
 3880         struct sctp_init_msg *initm;
 3881         struct sctp_supported_addr_param *sup_addr;
 3882         struct sctp_ecn_supported_param *ecn;
 3883         struct sctp_prsctp_supported_param *prsctp;
 3884         struct sctp_ecn_nonce_supported_param *ecn_nonce;
 3885         struct sctp_supported_chunk_types_param *pr_supported;
 3886         int cnt_inits_to = 0;
 3887         int padval, ret;
 3888         int num_ext;
 3889         int p_len;
 3890 
 3891         /* INIT's always go to the primary (and usually ONLY address) */
 3892         mp_last = NULL;
 3893         net = stcb->asoc.primary_destination;
 3894         if (net == NULL) {
 3895                 net = TAILQ_FIRST(&stcb->asoc.nets);
 3896                 if (net == NULL) {
 3897                         /* TSNH */
 3898                         return;
 3899                 }
 3900                 /* we confirm any address we send an INIT to */
 3901                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 3902                 (void)sctp_set_primary_addr(stcb, NULL, net);
 3903         } else {
 3904                 /* we confirm any address we send an INIT to */
 3905                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 3906         }
 3907         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 3908         if (((struct sockaddr *)&(net->ro._l_addr))->sa_family == AF_INET6) {
 3909                 /*
 3910                  * special hook, if we are sending to link local it will not
 3911                  * show up in our private address count.
 3912                  */
 3913                 struct sockaddr_in6 *sin6l;
 3914 
 3915                 sin6l = &net->ro._l_addr.sin6;
 3916                 if (IN6_IS_ADDR_LINKLOCAL(&sin6l->sin6_addr))
 3917                         cnt_inits_to = 1;
 3918         }
 3919         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 3920                 /* This case should not happen */
 3921                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 3922                 return;
 3923         }
 3924         /* start the INIT timer */
 3925         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 3926 
 3927         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_DONTWAIT, 1, MT_DATA);
 3928         if (m == NULL) {
 3929                 /* No memory, INIT timer will re-attempt. */
 3930                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 3931                 return;
 3932         }
 3933         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
 3934         /*
 3935          * assume peer supports asconf in order to be able to queue local
 3936          * address changes while an INIT is in flight and before the assoc
 3937          * is established.
 3938          */
 3939         stcb->asoc.peer_supports_asconf = 1;
 3940         /* Now lets put the SCTP header in place */
 3941         initm = mtod(m, struct sctp_init_msg *);
 3942         initm->sh.src_port = inp->sctp_lport;
 3943         initm->sh.dest_port = stcb->rport;
 3944         initm->sh.v_tag = 0;
 3945         initm->sh.checksum = 0; /* calculate later */
 3946         /* now the chunk header */
 3947         initm->msg.ch.chunk_type = SCTP_INITIATION;
 3948         initm->msg.ch.chunk_flags = 0;
 3949         /* fill in later from mbuf we build */
 3950         initm->msg.ch.chunk_length = 0;
 3951         /* place in my tag */
 3952         initm->msg.init.initiate_tag = htonl(stcb->asoc.my_vtag);
 3953         /* set up some of the credits. */
 3954         initm->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(inp->sctp_socket),
 3955             SCTP_MINIMAL_RWND));
 3956 
 3957         initm->msg.init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 3958         initm->msg.init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 3959         initm->msg.init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 3960         /* now the address restriction */
 3961         sup_addr = (struct sctp_supported_addr_param *)((caddr_t)initm +
 3962             sizeof(*initm));
 3963         sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 3964         /* we support 2 types IPv6/IPv4 */
 3965         sup_addr->ph.param_length = htons(sizeof(*sup_addr) +
 3966             sizeof(uint16_t));
 3967         sup_addr->addr_type[0] = htons(SCTP_IPV4_ADDRESS);
 3968         sup_addr->addr_type[1] = htons(SCTP_IPV6_ADDRESS);
 3969         SCTP_BUF_LEN(m) += sizeof(*sup_addr) + sizeof(uint16_t);
 3970 
 3971         if (inp->sctp_ep.adaptation_layer_indicator) {
 3972                 struct sctp_adaptation_layer_indication *ali;
 3973 
 3974                 ali = (struct sctp_adaptation_layer_indication *)(
 3975                     (caddr_t)sup_addr + sizeof(*sup_addr) + sizeof(uint16_t));
 3976                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 3977                 ali->ph.param_length = htons(sizeof(*ali));
 3978                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
 3979                 SCTP_BUF_LEN(m) += sizeof(*ali);
 3980                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
 3981                     sizeof(*ali));
 3982         } else {
 3983                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)sup_addr +
 3984                     sizeof(*sup_addr) + sizeof(uint16_t));
 3985         }
 3986 
 3987         /* now any cookie time extensions */
 3988         if (stcb->asoc.cookie_preserve_req) {
 3989                 struct sctp_cookie_perserve_param *cookie_preserve;
 3990 
 3991                 cookie_preserve = (struct sctp_cookie_perserve_param *)(ecn);
 3992                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 3993                 cookie_preserve->ph.param_length = htons(
 3994                     sizeof(*cookie_preserve));
 3995                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 3996                 SCTP_BUF_LEN(m) += sizeof(*cookie_preserve);
 3997                 ecn = (struct sctp_ecn_supported_param *)(
 3998                     (caddr_t)cookie_preserve + sizeof(*cookie_preserve));
 3999                 stcb->asoc.cookie_preserve_req = 0;
 4000         }
 4001         /* ECN parameter */
 4002         if (sctp_ecn_enable == 1) {
 4003                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
 4004                 ecn->ph.param_length = htons(sizeof(*ecn));
 4005                 SCTP_BUF_LEN(m) += sizeof(*ecn);
 4006                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
 4007                     sizeof(*ecn));
 4008         } else {
 4009                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
 4010         }
 4011         /* And now tell the peer we do pr-sctp */
 4012         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
 4013         prsctp->ph.param_length = htons(sizeof(*prsctp));
 4014         SCTP_BUF_LEN(m) += sizeof(*prsctp);
 4015 
 4016         /* And now tell the peer we do all the extensions */
 4017         pr_supported = (struct sctp_supported_chunk_types_param *)
 4018             ((caddr_t)prsctp + sizeof(*prsctp));
 4019         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 4020         num_ext = 0;
 4021         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 4022         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 4023         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 4024         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 4025         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 4026         if (!sctp_auth_disable)
 4027                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 4028         p_len = sizeof(*pr_supported) + num_ext;
 4029         pr_supported->ph.param_length = htons(p_len);
 4030         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
 4031         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 4032 
 4033         /* ECN nonce: And now tell the peer we support ECN nonce */
 4034         if (sctp_ecn_nonce) {
 4035                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
 4036                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
 4037                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
 4038                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
 4039                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
 4040         }
 4041         /* add authentication parameters */
 4042         if (!sctp_auth_disable) {
 4043                 struct sctp_auth_random *randp;
 4044                 struct sctp_auth_hmac_algo *hmacs;
 4045                 struct sctp_auth_chunk_list *chunks;
 4046 
 4047                 /* attach RANDOM parameter, if available */
 4048                 if (stcb->asoc.authinfo.random != NULL) {
 4049                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 4050                         p_len = sizeof(*randp) + stcb->asoc.authinfo.random_len;
 4051 #ifdef SCTP_AUTH_DRAFT_04
 4052                         randp->ph.param_type = htons(SCTP_RANDOM);
 4053                         randp->ph.param_length = htons(p_len);
 4054                         bcopy(stcb->asoc.authinfo.random->key,
 4055                             randp->random_data,
 4056                             stcb->asoc.authinfo.random_len);
 4057 #else
 4058                         /* random key already contains the header */
 4059                         bcopy(stcb->asoc.authinfo.random->key, randp, p_len);
 4060 #endif
 4061                         /* zero out any padding required */
 4062                         bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
 4063                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 4064                 }
 4065                 /* add HMAC_ALGO parameter */
 4066                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 4067                 p_len = sctp_serialize_hmaclist(stcb->asoc.local_hmacs,
 4068                     (uint8_t *) hmacs->hmac_ids);
 4069                 if (p_len > 0) {
 4070                         p_len += sizeof(*hmacs);
 4071                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 4072                         hmacs->ph.param_length = htons(p_len);
 4073                         /* zero out any padding required */
 4074                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
 4075                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 4076                 }
 4077                 /* add CHUNKS parameter */
 4078                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 4079                 p_len = sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks,
 4080                     chunks->chunk_types);
 4081                 if (p_len > 0) {
 4082                         p_len += sizeof(*chunks);
 4083                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 4084                         chunks->ph.param_length = htons(p_len);
 4085                         /* zero out any padding required */
 4086                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
 4087                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 4088                 }
 4089         }
 4090         m_at = m;
 4091         /* now the addresses */
 4092         {
 4093                 struct sctp_scoping scp;
 4094 
 4095                 /*
 4096                  * To optimize this we could put the scoping stuff into a
 4097                  * structure and remove the individual uint8's from the
 4098                  * assoc structure. Then we could just sifa in the address
 4099                  * within the stcb.. but for now this is a quick hack to get
 4100                  * the address stuff teased apart.
 4101                  */
 4102                 scp.ipv4_addr_legal = stcb->asoc.ipv4_addr_legal;
 4103                 scp.ipv6_addr_legal = stcb->asoc.ipv6_addr_legal;
 4104                 scp.loopback_scope = stcb->asoc.loopback_scope;
 4105                 scp.ipv4_local_scope = stcb->asoc.ipv4_local_scope;
 4106                 scp.local_scope = stcb->asoc.local_scope;
 4107                 scp.site_scope = stcb->asoc.site_scope;
 4108 
 4109                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
 4110         }
 4111 
 4112         /* calulate the size and update pkt header and chunk header */
 4113         p_len = 0;
 4114         for (m_at = m; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 4115                 if (SCTP_BUF_NEXT(m_at) == NULL)
 4116                         mp_last = m_at;
 4117                 p_len += SCTP_BUF_LEN(m_at);
 4118         }
 4119         initm->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
 4120         /*
 4121          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 4122          * here since the timer will drive a retranmission.
 4123          */
 4124 
 4125         /* I don't expect this to execute but we will be safe here */
 4126         padval = p_len % 4;
 4127         if ((padval) && (mp_last)) {
 4128                 /*
 4129                  * The compiler worries that mp_last may not be set even
 4130                  * though I think it is impossible :-> however we add
 4131                  * mp_last here just in case.
 4132                  */
 4133                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
 4134                 if (ret) {
 4135                         /* Houston we have a problem, no space */
 4136                         sctp_m_freem(m);
 4137                         return;
 4138                 }
 4139                 p_len += padval;
 4140         }
 4141         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 4142         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
 4143             (struct sockaddr *)&net->ro._l_addr,
 4144             m, 0, NULL, 0, 0, NULL, 0, so_locked);
 4145         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
 4146         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 4147         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 4148         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 4149 }
 4150 
 4151 struct mbuf *
 4152 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 4153     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp)
 4154 {
 4155         /*
 4156          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 4157          * being equal to the beginning of the params i.e. (iphlen +
 4158          * sizeof(struct sctp_init_msg) parse through the parameters to the
 4159          * end of the mbuf verifying that all parameters are known.
 4160          * 
 4161          * For unknown parameters build and return a mbuf with
 4162          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 4163          * processing this chunk stop, and set *abort_processing to 1.
 4164          * 
 4165          * By having param_offset be pre-set to where parameters begin it is
 4166          * hoped that this routine may be reused in the future by new
 4167          * features.
 4168          */
 4169         struct sctp_paramhdr *phdr, params;
 4170 
 4171         struct mbuf *mat, *op_err;
 4172         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
 4173         int at, limit, pad_needed;
 4174         uint16_t ptype, plen, padded_size;
 4175         int err_at;
 4176 
 4177         *abort_processing = 0;
 4178         mat = in_initpkt;
 4179         err_at = 0;
 4180         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 4181         at = param_offset;
 4182         op_err = NULL;
 4183         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 4184         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4185         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 4186                 ptype = ntohs(phdr->param_type);
 4187                 plen = ntohs(phdr->param_length);
 4188                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 4189                         /* wacked parameter */
 4190                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 4191                         goto invalid_size;
 4192                 }
 4193                 limit -= SCTP_SIZE32(plen);
 4194                 /*-
 4195                  * All parameters for all chunks that we know/understand are
 4196                  * listed here. We process them other places and make
 4197                  * appropriate stop actions per the upper bits. However this
 4198                  * is the generic routine processor's can call to get back
 4199                  * an operr.. to either incorporate (init-ack) or send.
 4200                  */
 4201                 padded_size = SCTP_SIZE32(plen);
 4202                 switch (ptype) {
 4203                         /* Param's with variable size */
 4204                 case SCTP_HEARTBEAT_INFO:
 4205                 case SCTP_STATE_COOKIE:
 4206                 case SCTP_UNRECOG_PARAM:
 4207                 case SCTP_ERROR_CAUSE_IND:
 4208                         /* ok skip fwd */
 4209                         at += padded_size;
 4210                         break;
 4211                         /* Param's with variable size within a range */
 4212                 case SCTP_CHUNK_LIST:
 4213                 case SCTP_SUPPORTED_CHUNK_EXT:
 4214                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 4215                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 4216                                 goto invalid_size;
 4217                         }
 4218                         at += padded_size;
 4219                         break;
 4220                 case SCTP_SUPPORTED_ADDRTYPE:
 4221                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 4222                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 4223                                 goto invalid_size;
 4224                         }
 4225                         at += padded_size;
 4226                         break;
 4227                 case SCTP_RANDOM:
 4228                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 4229                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 4230                                 goto invalid_size;
 4231                         }
 4232                         at += padded_size;
 4233                         break;
 4234                 case SCTP_SET_PRIM_ADDR:
 4235                 case SCTP_DEL_IP_ADDRESS:
 4236                 case SCTP_ADD_IP_ADDRESS:
 4237                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 4238                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 4239                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 4240                                 goto invalid_size;
 4241                         }
 4242                         at += padded_size;
 4243                         break;
 4244                         /* Param's with a fixed size */
 4245                 case SCTP_IPV4_ADDRESS:
 4246                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 4247                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 4248                                 goto invalid_size;
 4249                         }
 4250                         at += padded_size;
 4251                         break;
 4252                 case SCTP_IPV6_ADDRESS:
 4253                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 4254                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 4255                                 goto invalid_size;
 4256                         }
 4257                         at += padded_size;
 4258                         break;
 4259                 case SCTP_COOKIE_PRESERVE:
 4260                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 4261                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 4262                                 goto invalid_size;
 4263                         }
 4264                         at += padded_size;
 4265                         break;
 4266                 case SCTP_ECN_NONCE_SUPPORTED:
 4267                 case SCTP_PRSCTP_SUPPORTED:
 4268                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 4269                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecnnonce/prsctp %d\n", plen);
 4270                                 goto invalid_size;
 4271                         }
 4272                         at += padded_size;
 4273                         break;
 4274                 case SCTP_ECN_CAPABLE:
 4275                         if (padded_size != sizeof(struct sctp_ecn_supported_param)) {
 4276                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 4277                                 goto invalid_size;
 4278                         }
 4279                         at += padded_size;
 4280                         break;
 4281                 case SCTP_ULP_ADAPTATION:
 4282                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 4283                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 4284                                 goto invalid_size;
 4285                         }
 4286                         at += padded_size;
 4287                         break;
 4288                 case SCTP_SUCCESS_REPORT:
 4289                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 4290                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 4291                                 goto invalid_size;
 4292                         }
 4293                         at += padded_size;
 4294                         break;
 4295                 case SCTP_HOSTNAME_ADDRESS:
 4296                         {
 4297                                 /* We can NOT handle HOST NAME addresses!! */
 4298                                 int l_len;
 4299 
 4300                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 4301                                 *abort_processing = 1;
 4302                                 if (op_err == NULL) {
 4303                                         /* Ok need to try to get a mbuf */
 4304                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 4305                                         l_len += plen;
 4306                                         l_len += sizeof(struct sctp_paramhdr);
 4307                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 4308                                         if (op_err) {
 4309                                                 SCTP_BUF_LEN(op_err) = 0;
 4310                                                 /*
 4311                                                  * pre-reserve space for ip
 4312                                                  * and sctp header  and
 4313                                                  * chunk hdr
 4314                                                  */
 4315                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 4316                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 4317                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 4318                                         }
 4319                                 }
 4320                                 if (op_err) {
 4321                                         /* If we have space */
 4322                                         struct sctp_paramhdr s;
 4323 
 4324                                         if (err_at % 4) {
 4325                                                 uint32_t cpthis = 0;
 4326 
 4327                                                 pad_needed = 4 - (err_at % 4);
 4328                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 4329                                                 err_at += pad_needed;
 4330                                         }
 4331                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 4332                                         s.param_length = htons(sizeof(s) + plen);
 4333                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 4334                                         err_at += sizeof(s);
 4335                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 4336                                         if (phdr == NULL) {
 4337                                                 sctp_m_freem(op_err);
 4338                                                 /*
 4339                                                  * we are out of memory but
 4340                                                  * we still need to have a
 4341                                                  * look at what to do (the
 4342                                                  * system is in trouble
 4343                                                  * though).
 4344                                                  */
 4345                                                 return (NULL);
 4346                                         }
 4347                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 4348                                         err_at += plen;
 4349                                 }
 4350                                 return (op_err);
 4351                                 break;
 4352                         }
 4353                 default:
 4354                         /*
 4355                          * we do not recognize the parameter figure out what
 4356                          * we do.
 4357                          */
 4358                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 4359                         if ((ptype & 0x4000) == 0x4000) {
 4360                                 /* Report bit is set?? */
 4361                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 4362                                 if (op_err == NULL) {
 4363                                         int l_len;
 4364 
 4365                                         /* Ok need to try to get an mbuf */
 4366                                         l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 4367                                         l_len += plen;
 4368                                         l_len += sizeof(struct sctp_paramhdr);
 4369                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 4370                                         if (op_err) {
 4371                                                 SCTP_BUF_LEN(op_err) = 0;
 4372                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 4373                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 4374                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 4375                                         }
 4376                                 }
 4377                                 if (op_err) {
 4378                                         /* If we have space */
 4379                                         struct sctp_paramhdr s;
 4380 
 4381                                         if (err_at % 4) {
 4382                                                 uint32_t cpthis = 0;
 4383 
 4384                                                 pad_needed = 4 - (err_at % 4);
 4385                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 4386                                                 err_at += pad_needed;
 4387                                         }
 4388                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
 4389                                         s.param_length = htons(sizeof(s) + plen);
 4390                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 4391                                         err_at += sizeof(s);
 4392                                         if (plen > sizeof(tempbuf)) {
 4393                                                 plen = sizeof(tempbuf);
 4394                                         }
 4395                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 4396                                         if (phdr == NULL) {
 4397                                                 sctp_m_freem(op_err);
 4398                                                 /*
 4399                                                  * we are out of memory but
 4400                                                  * we still need to have a
 4401                                                  * look at what to do (the
 4402                                                  * system is in trouble
 4403                                                  * though).
 4404                                                  */
 4405                                                 op_err = NULL;
 4406                                                 goto more_processing;
 4407                                         }
 4408                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 4409                                         err_at += plen;
 4410                                 }
 4411                         }
 4412         more_processing:
 4413                         if ((ptype & 0x8000) == 0x0000) {
 4414                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 4415                                 return (op_err);
 4416                         } else {
 4417                                 /* skip this chunk and continue processing */
 4418                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 4419                                 at += SCTP_SIZE32(plen);
 4420                         }
 4421                         break;
 4422 
 4423                 }
 4424                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4425         }
 4426         return (op_err);
 4427 invalid_size:
 4428         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 4429         *abort_processing = 1;
 4430         if ((op_err == NULL) && phdr) {
 4431                 int l_len;
 4432 
 4433                 l_len = sizeof(struct ip6_hdr) + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
 4434                 l_len += (2 * sizeof(struct sctp_paramhdr));
 4435                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_DONTWAIT, 1, MT_DATA);
 4436                 if (op_err) {
 4437                         SCTP_BUF_LEN(op_err) = 0;
 4438                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 4439                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 4440                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 4441                 }
 4442         }
 4443         if ((op_err) && phdr) {
 4444                 struct sctp_paramhdr s;
 4445 
 4446                 if (err_at % 4) {
 4447                         uint32_t cpthis = 0;
 4448 
 4449                         pad_needed = 4 - (err_at % 4);
 4450                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 4451                         err_at += pad_needed;
 4452                 }
 4453                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 4454                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
 4455                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 4456                 err_at += sizeof(s);
 4457                 /* Only copy back the p-hdr that caused the issue */
 4458                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
 4459         }
 4460         return (op_err);
 4461 }
 4462 
 4463 static int
 4464 sctp_are_there_new_addresses(struct sctp_association *asoc,
 4465     struct mbuf *in_initpkt, int iphlen, int offset)
 4466 {
 4467         /*
 4468          * Given a INIT packet, look through the packet to verify that there
 4469          * are NO new addresses. As we go through the parameters add reports
 4470          * of any un-understood parameters that require an error.  Also we
 4471          * must return (1) to drop the packet if we see a un-understood
 4472          * parameter that tells us to drop the chunk.
 4473          */
 4474         struct sockaddr_in sin4, *sa4;
 4475         struct sockaddr_in6 sin6, *sa6;
 4476         struct sockaddr *sa_touse;
 4477         struct sockaddr *sa;
 4478         struct sctp_paramhdr *phdr, params;
 4479         struct ip *iph;
 4480         struct mbuf *mat;
 4481         uint16_t ptype, plen;
 4482         int err_at;
 4483         uint8_t fnd;
 4484         struct sctp_nets *net;
 4485 
 4486         memset(&sin4, 0, sizeof(sin4));
 4487         memset(&sin6, 0, sizeof(sin6));
 4488         sin4.sin_family = AF_INET;
 4489         sin4.sin_len = sizeof(sin4);
 4490         sin6.sin6_family = AF_INET6;
 4491         sin6.sin6_len = sizeof(sin6);
 4492 
 4493         sa_touse = NULL;
 4494         /* First what about the src address of the pkt ? */
 4495         iph = mtod(in_initpkt, struct ip *);
 4496         if (iph->ip_v == IPVERSION) {
 4497                 /* source addr is IPv4 */
 4498                 sin4.sin_addr = iph->ip_src;
 4499                 sa_touse = (struct sockaddr *)&sin4;
 4500         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
 4501                 /* source addr is IPv6 */
 4502                 struct ip6_hdr *ip6h;
 4503 
 4504                 ip6h = mtod(in_initpkt, struct ip6_hdr *);
 4505                 sin6.sin6_addr = ip6h->ip6_src;
 4506                 sa_touse = (struct sockaddr *)&sin6;
 4507         } else {
 4508                 return (1);
 4509         }
 4510 
 4511         fnd = 0;
 4512         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4513                 sa = (struct sockaddr *)&net->ro._l_addr;
 4514                 if (sa->sa_family == sa_touse->sa_family) {
 4515                         if (sa->sa_family == AF_INET) {
 4516                                 sa4 = (struct sockaddr_in *)sa;
 4517                                 if (sa4->sin_addr.s_addr ==
 4518                                     sin4.sin_addr.s_addr) {
 4519                                         fnd = 1;
 4520                                         break;
 4521                                 }
 4522                         } else if (sa->sa_family == AF_INET6) {
 4523                                 sa6 = (struct sockaddr_in6 *)sa;
 4524                                 if (SCTP6_ARE_ADDR_EQUAL(&sa6->sin6_addr,
 4525                                     &sin6.sin6_addr)) {
 4526                                         fnd = 1;
 4527                                         break;
 4528                                 }
 4529                         }
 4530                 }
 4531         }
 4532         if (fnd == 0) {
 4533                 /* New address added! no need to look futher. */
 4534                 return (1);
 4535         }
 4536         /* Ok so far lets munge through the rest of the packet */
 4537         mat = in_initpkt;
 4538         err_at = 0;
 4539         sa_touse = NULL;
 4540         offset += sizeof(struct sctp_init_chunk);
 4541         phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
 4542         while (phdr) {
 4543                 ptype = ntohs(phdr->param_type);
 4544                 plen = ntohs(phdr->param_length);
 4545                 if (ptype == SCTP_IPV4_ADDRESS) {
 4546                         struct sctp_ipv4addr_param *p4, p4_buf;
 4547 
 4548                         phdr = sctp_get_next_param(mat, offset,
 4549                             (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 4550                         if (plen != sizeof(struct sctp_ipv4addr_param) ||
 4551                             phdr == NULL) {
 4552                                 return (1);
 4553                         }
 4554                         p4 = (struct sctp_ipv4addr_param *)phdr;
 4555                         sin4.sin_addr.s_addr = p4->addr;
 4556                         sa_touse = (struct sockaddr *)&sin4;
 4557                 } else if (ptype == SCTP_IPV6_ADDRESS) {
 4558                         struct sctp_ipv6addr_param *p6, p6_buf;
 4559 
 4560                         phdr = sctp_get_next_param(mat, offset,
 4561                             (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 4562                         if (plen != sizeof(struct sctp_ipv6addr_param) ||
 4563                             phdr == NULL) {
 4564                                 return (1);
 4565                         }
 4566                         p6 = (struct sctp_ipv6addr_param *)phdr;
 4567                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 4568                             sizeof(p6->addr));
 4569                         sa_touse = (struct sockaddr *)&sin4;
 4570                 }
 4571                 if (sa_touse) {
 4572                         /* ok, sa_touse points to one to check */
 4573                         fnd = 0;
 4574                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 4575                                 sa = (struct sockaddr *)&net->ro._l_addr;
 4576                                 if (sa->sa_family != sa_touse->sa_family) {
 4577                                         continue;
 4578                                 }
 4579                                 if (sa->sa_family == AF_INET) {
 4580                                         sa4 = (struct sockaddr_in *)sa;
 4581                                         if (sa4->sin_addr.s_addr ==
 4582                                             sin4.sin_addr.s_addr) {
 4583                                                 fnd = 1;
 4584                                                 break;
 4585                                         }
 4586                                 } else if (sa->sa_family == AF_INET6) {
 4587                                         sa6 = (struct sockaddr_in6 *)sa;
 4588                                         if (SCTP6_ARE_ADDR_EQUAL(
 4589                                             &sa6->sin6_addr, &sin6.sin6_addr)) {
 4590                                                 fnd = 1;
 4591                                                 break;
 4592                                         }
 4593                                 }
 4594                         }
 4595                         if (!fnd) {
 4596                                 /* New addr added! no need to look further */
 4597                                 return (1);
 4598                         }
 4599                 }
 4600                 offset += SCTP_SIZE32(plen);
 4601                 phdr = sctp_get_next_param(mat, offset, &params, sizeof(params));
 4602         }
 4603         return (0);
 4604 }
 4605 
 4606 /*
 4607  * Given a MBUF chain that was sent into us containing an INIT. Build a
 4608  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 4609  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 4610  * message (i.e. the struct sctp_init_msg).
 4611  */
 4612 void
 4613 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 4614     struct mbuf *init_pkt, int iphlen, int offset, struct sctphdr *sh,
 4615     struct sctp_init_chunk *init_chk, uint32_t vrf_id, int hold_inp_lock)
 4616 {
 4617         struct sctp_association *asoc;
 4618         struct mbuf *m, *m_at, *m_tmp, *m_cookie, *op_err, *mp_last;
 4619         struct sctp_init_msg *initackm_out;
 4620         struct sctp_ecn_supported_param *ecn;
 4621         struct sctp_prsctp_supported_param *prsctp;
 4622         struct sctp_ecn_nonce_supported_param *ecn_nonce;
 4623         struct sctp_supported_chunk_types_param *pr_supported;
 4624         struct sockaddr_storage store;
 4625         struct sockaddr_in *sin;
 4626         struct sockaddr_in6 *sin6;
 4627         sctp_route_t *ro;
 4628         struct ip *iph;
 4629         struct ip6_hdr *ip6;
 4630         struct sockaddr *to;
 4631         struct sctp_state_cookie stc;
 4632         struct sctp_nets *net = NULL;
 4633         uint8_t *signature = NULL;
 4634         int cnt_inits_to = 0;
 4635         uint16_t his_limit, i_want;
 4636         int abort_flag, padval;
 4637         int num_ext;
 4638         int p_len;
 4639         struct socket *so;
 4640 
 4641         if (stcb)
 4642                 asoc = &stcb->asoc;
 4643         else
 4644                 asoc = NULL;
 4645         mp_last = NULL;
 4646         if ((asoc != NULL) &&
 4647             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT) &&
 4648             (sctp_are_there_new_addresses(asoc, init_pkt, iphlen, offset))) {
 4649                 /* new addresses, out of here in non-cookie-wait states */
 4650                 /*
 4651                  * Send a ABORT, we don't add the new address error clause
 4652                  * though we even set the T bit and copy in the 0 tag.. this
 4653                  * looks no different than if no listener was present.
 4654                  */
 4655                 sctp_send_abort(init_pkt, iphlen, sh, 0, NULL, vrf_id);
 4656                 return;
 4657         }
 4658         abort_flag = 0;
 4659         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 4660             (offset + sizeof(struct sctp_init_chunk)),
 4661             &abort_flag, (struct sctp_chunkhdr *)init_chk);
 4662         if (abort_flag) {
 4663                 sctp_send_abort(init_pkt, iphlen, sh,
 4664                     init_chk->init.initiate_tag, op_err, vrf_id);
 4665                 return;
 4666         }
 4667         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
 4668         if (m == NULL) {
 4669                 /* No memory, INIT timer will re-attempt. */
 4670                 if (op_err)
 4671                         sctp_m_freem(op_err);
 4672                 return;
 4673         }
 4674         SCTP_BUF_LEN(m) = sizeof(struct sctp_init_msg);
 4675 
 4676         /* the time I built cookie */
 4677         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
 4678 
 4679         /* populate any tie tags */
 4680         if (asoc != NULL) {
 4681                 /* unlock before tag selections */
 4682                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
 4683                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
 4684                 stc.cookie_life = asoc->cookie_life;
 4685                 net = asoc->primary_destination;
 4686         } else {
 4687                 stc.tie_tag_my_vtag = 0;
 4688                 stc.tie_tag_peer_vtag = 0;
 4689                 /* life I will award this cookie */
 4690                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
 4691         }
 4692 
 4693         /* copy in the ports for later check */
 4694         stc.myport = sh->dest_port;
 4695         stc.peerport = sh->src_port;
 4696 
 4697         /*
 4698          * If we wanted to honor cookie life extentions, we would add to
 4699          * stc.cookie_life. For now we should NOT honor any extension
 4700          */
 4701         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
 4702         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 4703                 struct inpcb *in_inp;
 4704 
 4705                 /* Its a V6 socket */
 4706                 in_inp = (struct inpcb *)inp;
 4707                 stc.ipv6_addr_legal = 1;
 4708                 /* Now look at the binding flag to see if V4 will be legal */
 4709                 if (SCTP_IPV6_V6ONLY(in_inp) == 0) {
 4710                         stc.ipv4_addr_legal = 1;
 4711                 } else {
 4712                         /* V4 addresses are NOT legal on the association */
 4713                         stc.ipv4_addr_legal = 0;
 4714                 }
 4715         } else {
 4716                 /* Its a V4 socket, no - V6 */
 4717                 stc.ipv4_addr_legal = 1;
 4718                 stc.ipv6_addr_legal = 0;
 4719         }
 4720 
 4721 #ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
 4722         stc.ipv4_scope = 1;
 4723 #else
 4724         stc.ipv4_scope = 0;
 4725 #endif
 4726         /* now for scope setup */
 4727         memset((caddr_t)&store, 0, sizeof(store));
 4728         sin = (struct sockaddr_in *)&store;
 4729         sin6 = (struct sockaddr_in6 *)&store;
 4730         if (net == NULL) {
 4731                 to = (struct sockaddr *)&store;
 4732                 iph = mtod(init_pkt, struct ip *);
 4733                 if (iph->ip_v == IPVERSION) {
 4734                         struct sctp_ifa *addr;
 4735                         sctp_route_t iproute;
 4736 
 4737                         sin->sin_family = AF_INET;
 4738                         sin->sin_len = sizeof(struct sockaddr_in);
 4739                         sin->sin_port = sh->src_port;
 4740                         sin->sin_addr = iph->ip_src;
 4741                         /* lookup address */
 4742                         stc.address[0] = sin->sin_addr.s_addr;
 4743                         stc.address[1] = 0;
 4744                         stc.address[2] = 0;
 4745                         stc.address[3] = 0;
 4746                         stc.addr_type = SCTP_IPV4_ADDRESS;
 4747                         /* local from address */
 4748                         memset(&iproute, 0, sizeof(iproute));
 4749                         ro = &iproute;
 4750                         memcpy(&ro->ro_dst, sin, sizeof(*sin));
 4751                         addr = sctp_source_address_selection(inp, NULL,
 4752                             ro, NULL, 0,
 4753                             vrf_id);
 4754                         if (addr == NULL)
 4755                                 return;
 4756 
 4757                         if (ro->ro_rt) {
 4758                                 RTFREE(ro->ro_rt);
 4759                                 ro->ro_rt = NULL;
 4760                         }
 4761                         stc.laddress[0] = addr->address.sin.sin_addr.s_addr;
 4762                         stc.laddress[1] = 0;
 4763                         stc.laddress[2] = 0;
 4764                         stc.laddress[3] = 0;
 4765                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 4766                         /* scope_id is only for v6 */
 4767                         stc.scope_id = 0;
 4768 #ifndef SCTP_DONT_DO_PRIVADDR_SCOPE
 4769                         if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
 4770                                 stc.ipv4_scope = 1;
 4771                         }
 4772 #else
 4773                         stc.ipv4_scope = 1;
 4774 #endif                          /* SCTP_DONT_DO_PRIVADDR_SCOPE */
 4775                         /* Must use the address in this case */
 4776                         if (sctp_is_address_on_local_host((struct sockaddr *)sin, vrf_id)) {
 4777                                 stc.loopback_scope = 1;
 4778                                 stc.ipv4_scope = 1;
 4779                                 stc.site_scope = 1;
 4780                                 stc.local_scope = 0;
 4781                         }
 4782                         sctp_free_ifa(addr);
 4783                 } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
 4784                         struct sctp_ifa *addr;
 4785                         struct route_in6 iproute6;
 4786 
 4787                         ip6 = mtod(init_pkt, struct ip6_hdr *);
 4788                         sin6->sin6_family = AF_INET6;
 4789                         sin6->sin6_len = sizeof(struct sockaddr_in6);
 4790                         sin6->sin6_port = sh->src_port;
 4791                         sin6->sin6_addr = ip6->ip6_src;
 4792                         /* lookup address */
 4793                         memcpy(&stc.address, &sin6->sin6_addr,
 4794                             sizeof(struct in6_addr));
 4795                         sin6->sin6_scope_id = 0;
 4796                         stc.addr_type = SCTP_IPV6_ADDRESS;
 4797                         stc.scope_id = 0;
 4798                         if (sctp_is_address_on_local_host((struct sockaddr *)sin6, vrf_id)) {
 4799                                 stc.loopback_scope = 1;
 4800                                 stc.local_scope = 0;
 4801                                 stc.site_scope = 1;
 4802                                 stc.ipv4_scope = 1;
 4803                         } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 4804                                 /*
 4805                                  * If the new destination is a LINK_LOCAL we
 4806                                  * must have common both site and local
 4807                                  * scope. Don't set local scope though since
 4808                                  * we must depend on the source to be added
 4809                                  * implicitly. We cannot assure just because
 4810                                  * we share one link that all links are
 4811                                  * common.
 4812                                  */
 4813                                 stc.local_scope = 0;
 4814                                 stc.site_scope = 1;
 4815                                 stc.ipv4_scope = 1;
 4816                                 /*
 4817                                  * we start counting for the private address
 4818                                  * stuff at 1. since the link local we
 4819                                  * source from won't show up in our scoped
 4820                                  * count.
 4821                                  */
 4822                                 cnt_inits_to = 1;
 4823                                 /* pull out the scope_id from incoming pkt */
 4824                                 /* FIX ME: does this have scope from rcvif? */
 4825                                 (void)sa6_recoverscope(sin6);
 4826 
 4827                                 sa6_embedscope(sin6, ip6_use_defzone);
 4828                                 stc.scope_id = sin6->sin6_scope_id;
 4829                         } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
 4830                                 /*
 4831                                  * If the new destination is SITE_LOCAL then
 4832                                  * we must have site scope in common.
 4833                                  */
 4834                                 stc.site_scope = 1;
 4835                         }
 4836                         /* local from address */
 4837                         memset(&iproute6, 0, sizeof(iproute6));
 4838                         ro = (sctp_route_t *) & iproute6;
 4839                         memcpy(&ro->ro_dst, sin6, sizeof(*sin6));
 4840                         addr = sctp_source_address_selection(inp, NULL,
 4841                             ro, NULL, 0, vrf_id);
 4842                         if (addr == NULL)
 4843                                 return;
 4844 
 4845                         if (ro->ro_rt) {
 4846                                 RTFREE(ro->ro_rt);
 4847                                 ro->ro_rt = NULL;
 4848                         }
 4849                         memcpy(&stc.laddress, &addr->address.sin6.sin6_addr, sizeof(struct in6_addr));
 4850                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 4851                         sctp_free_ifa(addr);
 4852                 }
 4853         } else {
 4854                 /* set the scope per the existing tcb */
 4855                 struct sctp_nets *lnet;
 4856 
 4857                 stc.loopback_scope = asoc->loopback_scope;
 4858                 stc.ipv4_scope = asoc->ipv4_local_scope;
 4859                 stc.site_scope = asoc->site_scope;
 4860                 stc.local_scope = asoc->local_scope;
 4861                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 4862                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
 4863                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
 4864                                         /*
 4865                                          * if we have a LL address, start
 4866                                          * counting at 1.
 4867                                          */
 4868                                         cnt_inits_to = 1;
 4869                                 }
 4870                         }
 4871                 }
 4872 
 4873                 /* use the net pointer */
 4874                 to = (struct sockaddr *)&net->ro._l_addr;
 4875                 if (to->sa_family == AF_INET) {
 4876                         sin = (struct sockaddr_in *)to;
 4877                         stc.address[0] = sin->sin_addr.s_addr;
 4878                         stc.address[1] = 0;
 4879                         stc.address[2] = 0;
 4880                         stc.address[3] = 0;
 4881                         stc.addr_type = SCTP_IPV4_ADDRESS;
 4882                         if (net->src_addr_selected == 0) {
 4883                                 /*
 4884                                  * strange case here, the INIT should have
 4885                                  * did the selection.
 4886                                  */
 4887                                 net->ro._s_addr = sctp_source_address_selection(inp,
 4888                                     stcb, (sctp_route_t *) & net->ro,
 4889                                     net, 0, vrf_id);
 4890                                 if (net->ro._s_addr == NULL)
 4891                                         return;
 4892 
 4893                                 net->src_addr_selected = 1;
 4894 
 4895                         }
 4896                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
 4897                         stc.laddress[1] = 0;
 4898                         stc.laddress[2] = 0;
 4899                         stc.laddress[3] = 0;
 4900                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 4901                 } else if (to->sa_family == AF_INET6) {
 4902                         sin6 = (struct sockaddr_in6 *)to;
 4903                         memcpy(&stc.address, &sin6->sin6_addr,
 4904                             sizeof(struct in6_addr));
 4905                         stc.addr_type = SCTP_IPV6_ADDRESS;
 4906                         if (net->src_addr_selected == 0) {
 4907                                 /*
 4908                                  * strange case here, the INIT should have
 4909                                  * did the selection.
 4910                                  */
 4911                                 net->ro._s_addr = sctp_source_address_selection(inp,
 4912                                     stcb, (sctp_route_t *) & net->ro,
 4913                                     net, 0, vrf_id);
 4914                                 if (net->ro._s_addr == NULL)
 4915                                         return;
 4916 
 4917                                 net->src_addr_selected = 1;
 4918                         }
 4919                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
 4920                             sizeof(struct in6_addr));
 4921                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 4922                 }
 4923         }
 4924         /* Now lets put the SCTP header in place */
 4925         initackm_out = mtod(m, struct sctp_init_msg *);
 4926         initackm_out->sh.src_port = inp->sctp_lport;
 4927         initackm_out->sh.dest_port = sh->src_port;
 4928         initackm_out->sh.v_tag = init_chk->init.initiate_tag;
 4929         /* Save it off for quick ref */
 4930         stc.peers_vtag = init_chk->init.initiate_tag;
 4931         initackm_out->sh.checksum = 0;  /* calculate later */
 4932         /* who are we */
 4933         memcpy(stc.identification, SCTP_VERSION_STRING,
 4934             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
 4935         /* now the chunk header */
 4936         initackm_out->msg.ch.chunk_type = SCTP_INITIATION_ACK;
 4937         initackm_out->msg.ch.chunk_flags = 0;
 4938         /* fill in later from mbuf we build */
 4939         initackm_out->msg.ch.chunk_length = 0;
 4940         /* place in my tag */
 4941         if ((asoc != NULL) &&
 4942             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 4943             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
 4944             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
 4945                 /* re-use the v-tags and init-seq here */
 4946                 initackm_out->msg.init.initiate_tag = htonl(asoc->my_vtag);
 4947                 initackm_out->msg.init.initial_tsn = htonl(asoc->init_seq_number);
 4948         } else {
 4949                 uint32_t vtag, itsn;
 4950 
 4951                 if (hold_inp_lock) {
 4952                         SCTP_INP_INCR_REF(inp);
 4953                         SCTP_INP_RUNLOCK(inp);
 4954                 }
 4955                 if (asoc) {
 4956                         atomic_add_int(&asoc->refcnt, 1);
 4957                         SCTP_TCB_UNLOCK(stcb);
 4958                         vtag = sctp_select_a_tag(inp, 1);
 4959                         initackm_out->msg.init.initiate_tag = htonl(vtag);
 4960                         /* get a TSN to use too */
 4961                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 4962                         initackm_out->msg.init.initial_tsn = htonl(itsn);
 4963                         SCTP_TCB_LOCK(stcb);
 4964                         atomic_add_int(&asoc->refcnt, -1);
 4965                 } else {
 4966                         vtag = sctp_select_a_tag(inp, 1);
 4967                         initackm_out->msg.init.initiate_tag = htonl(vtag);
 4968                         /* get a TSN to use too */
 4969                         initackm_out->msg.init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 4970                 }
 4971                 if (hold_inp_lock) {
 4972                         SCTP_INP_RLOCK(inp);
 4973                         SCTP_INP_DECR_REF(inp);
 4974                 }
 4975         }
 4976         /* save away my tag to */
 4977         stc.my_vtag = initackm_out->msg.init.initiate_tag;
 4978 
 4979         /* set up some of the credits. */
 4980         so = inp->sctp_socket;
 4981         if (so == NULL) {
 4982                 /* memory problem */
 4983                 sctp_m_freem(m);
 4984                 return;
 4985         } else {
 4986                 initackm_out->msg.init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 4987         }
 4988         /* set what I want */
 4989         his_limit = ntohs(init_chk->init.num_inbound_streams);
 4990         /* choose what I want */
 4991         if (asoc != NULL) {
 4992                 if (asoc->streamoutcnt > inp->sctp_ep.pre_open_stream_count) {
 4993                         i_want = asoc->streamoutcnt;
 4994                 } else {
 4995                         i_want = inp->sctp_ep.pre_open_stream_count;
 4996                 }
 4997         } else {
 4998                 i_want = inp->sctp_ep.pre_open_stream_count;
 4999         }
 5000         if (his_limit < i_want) {
 5001                 /* I Want more :< */
 5002                 initackm_out->msg.init.num_outbound_streams = init_chk->init.num_inbound_streams;
 5003         } else {
 5004                 /* I can have what I want :> */
 5005                 initackm_out->msg.init.num_outbound_streams = htons(i_want);
 5006         }
 5007         /* tell him his limt. */
 5008         initackm_out->msg.init.num_inbound_streams =
 5009             htons(inp->sctp_ep.max_open_streams_intome);
 5010         /* setup the ECN pointer */
 5011 
 5012         if (inp->sctp_ep.adaptation_layer_indicator) {
 5013                 struct sctp_adaptation_layer_indication *ali;
 5014 
 5015                 ali = (struct sctp_adaptation_layer_indication *)(
 5016                     (caddr_t)initackm_out + sizeof(*initackm_out));
 5017                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 5018                 ali->ph.param_length = htons(sizeof(*ali));
 5019                 ali->indication = ntohl(inp->sctp_ep.adaptation_layer_indicator);
 5020                 SCTP_BUF_LEN(m) += sizeof(*ali);
 5021                 ecn = (struct sctp_ecn_supported_param *)((caddr_t)ali +
 5022                     sizeof(*ali));
 5023         } else {
 5024                 ecn = (struct sctp_ecn_supported_param *)(
 5025                     (caddr_t)initackm_out + sizeof(*initackm_out));
 5026         }
 5027 
 5028         /* ECN parameter */
 5029         if (sctp_ecn_enable == 1) {
 5030                 ecn->ph.param_type = htons(SCTP_ECN_CAPABLE);
 5031                 ecn->ph.param_length = htons(sizeof(*ecn));
 5032                 SCTP_BUF_LEN(m) += sizeof(*ecn);
 5033 
 5034                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn +
 5035                     sizeof(*ecn));
 5036         } else {
 5037                 prsctp = (struct sctp_prsctp_supported_param *)((caddr_t)ecn);
 5038         }
 5039         /* And now tell the peer we do  pr-sctp */
 5040         prsctp->ph.param_type = htons(SCTP_PRSCTP_SUPPORTED);
 5041         prsctp->ph.param_length = htons(sizeof(*prsctp));
 5042         SCTP_BUF_LEN(m) += sizeof(*prsctp);
 5043 
 5044         /* And now tell the peer we do all the extensions */
 5045         pr_supported = (struct sctp_supported_chunk_types_param *)
 5046             ((caddr_t)prsctp + sizeof(*prsctp));
 5047 
 5048         pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 5049         num_ext = 0;
 5050         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 5051         pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 5052         pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 5053         pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 5054         pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 5055         if (!sctp_auth_disable)
 5056                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 5057         p_len = sizeof(*pr_supported) + num_ext;
 5058         pr_supported->ph.param_length = htons(p_len);
 5059         bzero((caddr_t)pr_supported + p_len, SCTP_SIZE32(p_len) - p_len);
 5060         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 5061 
 5062         /* ECN nonce: And now tell the peer we support ECN nonce */
 5063         if (sctp_ecn_nonce) {
 5064                 ecn_nonce = (struct sctp_ecn_nonce_supported_param *)
 5065                     ((caddr_t)pr_supported + SCTP_SIZE32(p_len));
 5066                 ecn_nonce->ph.param_type = htons(SCTP_ECN_NONCE_SUPPORTED);
 5067                 ecn_nonce->ph.param_length = htons(sizeof(*ecn_nonce));
 5068                 SCTP_BUF_LEN(m) += sizeof(*ecn_nonce);
 5069         }
 5070         /* add authentication parameters */
 5071         if (!sctp_auth_disable) {
 5072                 struct sctp_auth_random *randp;
 5073                 struct sctp_auth_hmac_algo *hmacs;
 5074                 struct sctp_auth_chunk_list *chunks;
 5075                 uint16_t random_len;
 5076 
 5077                 /* generate and add RANDOM parameter */
 5078                 random_len = SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 5079                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 5080                 randp->ph.param_type = htons(SCTP_RANDOM);
 5081                 p_len = sizeof(*randp) + random_len;
 5082                 randp->ph.param_length = htons(p_len);
 5083                 SCTP_READ_RANDOM(randp->random_data, random_len);
 5084                 /* zero out any padding required */
 5085                 bzero((caddr_t)randp + p_len, SCTP_SIZE32(p_len) - p_len);
 5086                 SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 5087 
 5088                 /* add HMAC_ALGO parameter */
 5089                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 5090                 p_len = sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 5091                     (uint8_t *) hmacs->hmac_ids);
 5092                 if (p_len > 0) {
 5093                         p_len += sizeof(*hmacs);
 5094                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 5095                         hmacs->ph.param_length = htons(p_len);
 5096                         /* zero out any padding required */
 5097                         bzero((caddr_t)hmacs + p_len, SCTP_SIZE32(p_len) - p_len);
 5098                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 5099                 }
 5100                 /* add CHUNKS parameter */
 5101                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+SCTP_BUF_LEN(m));
 5102                 p_len = sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 5103                     chunks->chunk_types);
 5104                 if (p_len > 0) {
 5105                         p_len += sizeof(*chunks);
 5106                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 5107                         chunks->ph.param_length = htons(p_len);
 5108                         /* zero out any padding required */
 5109                         bzero((caddr_t)chunks + p_len, SCTP_SIZE32(p_len) - p_len);
 5110                         SCTP_BUF_LEN(m) += SCTP_SIZE32(p_len);
 5111                 }
 5112         }
 5113         m_at = m;
 5114         /* now the addresses */
 5115         {
 5116                 struct sctp_scoping scp;
 5117 
 5118                 /*
 5119                  * To optimize this we could put the scoping stuff into a
 5120                  * structure and remove the individual uint8's from the stc
 5121                  * structure. Then we could just sifa in the address within
 5122                  * the stc.. but for now this is a quick hack to get the
 5123                  * address stuff teased apart.
 5124                  */
 5125                 scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 5126                 scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 5127                 scp.loopback_scope = stc.loopback_scope;
 5128                 scp.ipv4_local_scope = stc.ipv4_scope;
 5129                 scp.local_scope = stc.local_scope;
 5130                 scp.site_scope = stc.site_scope;
 5131                 m_at = sctp_add_addresses_to_i_ia(inp, &scp, m_at, cnt_inits_to);
 5132         }
 5133 
 5134         /* tack on the operational error if present */
 5135         if (op_err) {
 5136                 struct mbuf *ol;
 5137                 int llen;
 5138 
 5139                 llen = 0;
 5140                 ol = op_err;
 5141                 while (ol) {
 5142                         llen += SCTP_BUF_LEN(ol);
 5143                         ol = SCTP_BUF_NEXT(ol);
 5144                 }
 5145                 if (llen % 4) {
 5146                         /* must add a pad to the param */
 5147                         uint32_t cpthis = 0;
 5148                         int padlen;
 5149 
 5150                         padlen = 4 - (llen % 4);
 5151                         m_copyback(op_err, llen, padlen, (caddr_t)&cpthis);
 5152                 }
 5153                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 5154                         m_at = SCTP_BUF_NEXT(m_at);
 5155                 }
 5156                 SCTP_BUF_NEXT(m_at) = op_err;
 5157                 while (SCTP_BUF_NEXT(m_at) != NULL) {
 5158                         m_at = SCTP_BUF_NEXT(m_at);
 5159                 }
 5160         }
 5161         /* pre-calulate the size and update pkt header and chunk header */
 5162         p_len = 0;
 5163         for (m_tmp = m; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 5164                 p_len += SCTP_BUF_LEN(m_tmp);
 5165                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 5166                         /* m_tmp should now point to last one */
 5167                         break;
 5168                 }
 5169         }
 5170 
 5171         /* Now we must build a cookie */
 5172         m_cookie = sctp_add_cookie(inp, init_pkt, offset, m,
 5173             sizeof(struct sctphdr), &stc, &signature);
 5174         if (m_cookie == NULL) {
 5175                 /* memory problem */
 5176                 sctp_m_freem(m);
 5177                 return;
 5178         }
 5179         /* Now append the cookie to the end and update the space/size */
 5180         SCTP_BUF_NEXT(m_tmp) = m_cookie;
 5181 
 5182         for (m_tmp = m_cookie; m_tmp; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 5183                 p_len += SCTP_BUF_LEN(m_tmp);
 5184                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 5185                         /* m_tmp should now point to last one */
 5186                         mp_last = m_tmp;
 5187                         break;
 5188                 }
 5189         }
 5190         /*
 5191          * Place in the size, but we don't include the last pad (if any) in
 5192          * the INIT-ACK.
 5193          */
 5194         initackm_out->msg.ch.chunk_length = htons((p_len - sizeof(struct sctphdr)));
 5195 
 5196         /*
 5197          * Time to sign the cookie, we don't sign over the cookie signature
 5198          * though thus we set trailer.
 5199          */
 5200         (void)sctp_hmac_m(SCTP_HMAC,
 5201             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 5202             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 5203             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
 5204         /*
 5205          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 5206          * here since the timer will drive a retranmission.
 5207          */
 5208         padval = p_len % 4;
 5209         if ((padval) && (mp_last)) {
 5210                 /* see my previous comments on mp_last */
 5211                 int ret;
 5212 
 5213                 ret = sctp_add_pad_tombuf(mp_last, (4 - padval));
 5214                 if (ret) {
 5215                         /* Houston we have a problem, no space */
 5216                         sctp_m_freem(m);
 5217                         return;
 5218                 }
 5219                 p_len += padval;
 5220         }
 5221         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 5222             NULL, 0, SCTP_SO_NOT_LOCKED);
 5223         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 5224 }
 5225 
 5226 
 5227 void
 5228 sctp_insert_on_wheel(struct sctp_tcb *stcb,
 5229     struct sctp_association *asoc,
 5230     struct sctp_stream_out *strq, int holds_lock)
 5231 {
 5232         struct sctp_stream_out *stre, *strn;
 5233 
 5234         if (holds_lock == 0) {
 5235                 SCTP_TCB_SEND_LOCK(stcb);
 5236         }
 5237         if ((strq->next_spoke.tqe_next) ||
 5238             (strq->next_spoke.tqe_prev)) {
 5239                 /* already on wheel */
 5240                 goto outof_here;
 5241         }
 5242         stre = TAILQ_FIRST(&asoc->out_wheel);
 5243         if (stre == NULL) {
 5244                 /* only one on wheel */
 5245                 TAILQ_INSERT_HEAD(&asoc->out_wheel, strq, next_spoke);
 5246                 goto outof_here;
 5247         }
 5248         for (; stre; stre = strn) {
 5249                 strn = TAILQ_NEXT(stre, next_spoke);
 5250                 if (stre->stream_no > strq->stream_no) {
 5251                         TAILQ_INSERT_BEFORE(stre, strq, next_spoke);
 5252                         goto outof_here;
 5253                 } else if (stre->stream_no == strq->stream_no) {
 5254                         /* huh, should not happen */
 5255                         goto outof_here;
 5256                 } else if (strn == NULL) {
 5257                         /* next one is null */
 5258                         TAILQ_INSERT_AFTER(&asoc->out_wheel, stre, strq,
 5259                             next_spoke);
 5260                 }
 5261         }
 5262 outof_here:
 5263         if (holds_lock == 0) {
 5264                 SCTP_TCB_SEND_UNLOCK(stcb);
 5265         }
 5266 }
 5267 
 5268 static void
 5269 sctp_remove_from_wheel(struct sctp_tcb *stcb,
 5270     struct sctp_association *asoc,
 5271     struct sctp_stream_out *strq)
 5272 {
 5273         /* take off and then setup so we know it is not on the wheel */
 5274         SCTP_TCB_SEND_LOCK(stcb);
 5275         if (TAILQ_FIRST(&strq->outqueue)) {
 5276                 /* more was added */
 5277                 SCTP_TCB_SEND_UNLOCK(stcb);
 5278                 return;
 5279         }
 5280         TAILQ_REMOVE(&asoc->out_wheel, strq, next_spoke);
 5281         strq->next_spoke.tqe_next = NULL;
 5282         strq->next_spoke.tqe_prev = NULL;
 5283         SCTP_TCB_SEND_UNLOCK(stcb);
 5284 }
 5285 
 5286 static void
 5287 sctp_prune_prsctp(struct sctp_tcb *stcb,
 5288     struct sctp_association *asoc,
 5289     struct sctp_sndrcvinfo *srcv,
 5290     int dataout)
 5291 {
 5292         int freed_spc = 0;
 5293         struct sctp_tmit_chunk *chk, *nchk;
 5294 
 5295         SCTP_TCB_LOCK_ASSERT(stcb);
 5296         if ((asoc->peer_supports_prsctp) &&
 5297             (asoc->sent_queue_cnt_removeable > 0)) {
 5298                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 5299                         /*
 5300                          * Look for chunks marked with the PR_SCTP flag AND
 5301                          * the buffer space flag. If the one being sent is
 5302                          * equal or greater priority then purge the old one
 5303                          * and free some space.
 5304                          */
 5305                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 5306                                 /*
 5307                                  * This one is PR-SCTP AND buffer space
 5308                                  * limited type
 5309                                  */
 5310                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 5311                                         /*
 5312                                          * Lower numbers equates to higher
 5313                                          * priority so if the one we are
 5314                                          * looking at has a larger or equal
 5315                                          * priority we want to drop the data
 5316                                          * and NOT retransmit it.
 5317                                          */
 5318                                         if (chk->data) {
 5319                                                 /*
 5320                                                  * We release the book_size
 5321                                                  * if the mbuf is here
 5322                                                  */
 5323                                                 int ret_spc;
 5324                                                 int cause;
 5325 
 5326                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 5327                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT;
 5328                                                 else
 5329                                                         cause = SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT;
 5330                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 5331                                                     cause,
 5332                                                     &asoc->sent_queue, SCTP_SO_LOCKED);
 5333                                                 freed_spc += ret_spc;
 5334                                                 if (freed_spc >= dataout) {
 5335                                                         return;
 5336                                                 }
 5337                                         }       /* if chunk was present */
 5338                                 }       /* if of sufficent priority */
 5339                         }       /* if chunk has enabled */
 5340                 }               /* tailqforeach */
 5341 
 5342                 chk = TAILQ_FIRST(&asoc->send_queue);
 5343                 while (chk) {
 5344                         nchk = TAILQ_NEXT(chk, sctp_next);
 5345                         /* Here we must move to the sent queue and mark */
 5346                         if (PR_SCTP_TTL_ENABLED(chk->flags)) {
 5347                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 5348                                         if (chk->data) {
 5349                                                 /*
 5350                                                  * We release the book_size
 5351                                                  * if the mbuf is here
 5352                                                  */
 5353                                                 int ret_spc;
 5354 
 5355                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 5356                                                     SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_UNSENT,
 5357                                                     &asoc->send_queue, SCTP_SO_LOCKED);
 5358 
 5359                                                 freed_spc += ret_spc;
 5360                                                 if (freed_spc >= dataout) {
 5361                                                         return;
 5362                                                 }
 5363                                         }       /* end if chk->data */
 5364                                 }       /* end if right class */
 5365                         }       /* end if chk pr-sctp */
 5366                         chk = nchk;
 5367                 }               /* end while (chk) */
 5368         }                       /* if enabled in asoc */
 5369 }
 5370 
 5371 int
 5372 sctp_get_frag_point(struct sctp_tcb *stcb,
 5373     struct sctp_association *asoc)
 5374 {
 5375         int siz, ovh;
 5376 
 5377         /*
 5378          * For endpoints that have both v6 and v4 addresses we must reserve
 5379          * room for the ipv6 header, for those that are only dealing with V4
 5380          * we use a larger frag point.
 5381          */
 5382         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 5383                 ovh = SCTP_MED_OVERHEAD;
 5384         } else {
 5385                 ovh = SCTP_MED_V4_OVERHEAD;
 5386         }
 5387 
 5388         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
 5389                 siz = asoc->smallest_mtu - ovh;
 5390         else
 5391                 siz = (stcb->asoc.sctp_frag_point - ovh);
 5392         /*
 5393          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
 5394          */
 5395         /* A data chunk MUST fit in a cluster */
 5396         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
 5397         /* } */
 5398 
 5399         /* adjust for an AUTH chunk if DATA requires auth */
 5400         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
 5401                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 5402 
 5403         if (siz % 4) {
 5404                 /* make it an even word boundary please */
 5405                 siz -= (siz % 4);
 5406         }
 5407         return (siz);
 5408 }
 5409 
 5410 static void
 5411 sctp_set_prsctp_policy(struct sctp_tcb *stcb,
 5412     struct sctp_stream_queue_pending *sp)
 5413 {
 5414         sp->pr_sctp_on = 0;
 5415         if (stcb->asoc.peer_supports_prsctp) {
 5416                 /*
 5417                  * We assume that the user wants PR_SCTP_TTL if the user
 5418                  * provides a positive lifetime but does not specify any
 5419                  * PR_SCTP policy. This is a BAD assumption and causes
 5420                  * problems at least with the U-Vancovers MPI folks. I will
 5421                  * change this to be no policy means NO PR-SCTP.
 5422                  */
 5423                 if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 5424                         sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 5425                         sp->pr_sctp_on = 1;
 5426                 } else {
 5427                         return;
 5428                 }
 5429                 switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 5430                 case CHUNK_FLAGS_PR_SCTP_BUF:
 5431                         /*
 5432                          * Time to live is a priority stored in tv_sec when
 5433                          * doing the buffer drop thing.
 5434                          */
 5435                         sp->ts.tv_sec = sp->timetolive;
 5436                         sp->ts.tv_usec = 0;
 5437                         break;
 5438                 case CHUNK_FLAGS_PR_SCTP_TTL:
 5439                         {
 5440                                 struct timeval tv;
 5441 
 5442                                 (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 5443                                 tv.tv_sec = sp->timetolive / 1000;
 5444                                 tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 5445                                 timevaladd(&sp->ts, &tv);
 5446                         }
 5447                         break;
 5448                 case CHUNK_FLAGS_PR_SCTP_RTX:
 5449                         /*
 5450                          * Time to live is a the number or retransmissions
 5451                          * stored in tv_sec.
 5452                          */
 5453                         sp->ts.tv_sec = sp->timetolive;
 5454                         sp->ts.tv_usec = 0;
 5455                         break;
 5456                 default:
 5457                         SCTPDBG(SCTP_DEBUG_USRREQ1,
 5458                             "Unknown PR_SCTP policy %u.\n",
 5459                             PR_SCTP_POLICY(sp->sinfo_flags));
 5460                         break;
 5461                 }
 5462         }
 5463 }
 5464 
 5465 static int
 5466 sctp_msg_append(struct sctp_tcb *stcb,
 5467     struct sctp_nets *net,
 5468     struct mbuf *m,
 5469     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
 5470 {
 5471         int error = 0, holds_lock;
 5472         struct mbuf *at;
 5473         struct sctp_stream_queue_pending *sp = NULL;
 5474         struct sctp_stream_out *strm;
 5475 
 5476         /*
 5477          * Given an mbuf chain, put it into the association send queue and
 5478          * place it on the wheel
 5479          */
 5480         holds_lock = hold_stcb_lock;
 5481         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 5482                 /* Invalid stream number */
 5483                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 5484                 error = EINVAL;
 5485                 goto out_now;
 5486         }
 5487         if ((stcb->asoc.stream_locked) &&
 5488             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 5489                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 5490                 error = EINVAL;
 5491                 goto out_now;
 5492         }
 5493         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 5494         /* Now can we send this? */
 5495         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
 5496             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 5497             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 5498             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 5499                 /* got data while shutting down */
 5500                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
 5501                 error = ECONNRESET;
 5502                 goto out_now;
 5503         }
 5504         sctp_alloc_a_strmoq(stcb, sp);
 5505         if (sp == NULL) {
 5506                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5507                 error = ENOMEM;
 5508                 goto out_now;
 5509         }
 5510         sp->sinfo_flags = srcv->sinfo_flags;
 5511         sp->timetolive = srcv->sinfo_timetolive;
 5512         sp->ppid = srcv->sinfo_ppid;
 5513         sp->context = srcv->sinfo_context;
 5514         sp->strseq = 0;
 5515         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 5516                 sp->net = net;
 5517                 sp->addr_over = 1;
 5518         } else {
 5519                 sp->net = stcb->asoc.primary_destination;
 5520                 sp->addr_over = 0;
 5521         }
 5522         atomic_add_int(&sp->net->ref_count, 1);
 5523         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 5524         sp->stream = srcv->sinfo_stream;
 5525         sp->msg_is_complete = 1;
 5526         sp->sender_all_done = 1;
 5527         sp->some_taken = 0;
 5528         sp->data = m;
 5529         sp->tail_mbuf = NULL;
 5530         sp->length = 0;
 5531         at = m;
 5532         sctp_set_prsctp_policy(stcb, sp);
 5533         /*
 5534          * We could in theory (for sendall) sifa the length in, but we would
 5535          * still have to hunt through the chain since we need to setup the
 5536          * tail_mbuf
 5537          */
 5538         while (at) {
 5539                 if (SCTP_BUF_NEXT(at) == NULL)
 5540                         sp->tail_mbuf = at;
 5541                 sp->length += SCTP_BUF_LEN(at);
 5542                 at = SCTP_BUF_NEXT(at);
 5543         }
 5544         SCTP_TCB_SEND_LOCK(stcb);
 5545         sctp_snd_sb_alloc(stcb, sp->length);
 5546         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 5547         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 5548         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
 5549                 sp->strseq = strm->next_sequence_sent;
 5550                 strm->next_sequence_sent++;
 5551         }
 5552         if ((strm->next_spoke.tqe_next == NULL) &&
 5553             (strm->next_spoke.tqe_prev == NULL)) {
 5554                 /* Not on wheel, insert */
 5555                 sctp_insert_on_wheel(stcb, &stcb->asoc, strm, 1);
 5556         }
 5557         m = NULL;
 5558         SCTP_TCB_SEND_UNLOCK(stcb);
 5559 out_now:
 5560         if (m) {
 5561                 sctp_m_freem(m);
 5562         }
 5563         return (error);
 5564 }
 5565 
 5566 
 5567 static struct mbuf *
 5568 sctp_copy_mbufchain(struct mbuf *clonechain,
 5569     struct mbuf *outchain,
 5570     struct mbuf **endofchain,
 5571     int can_take_mbuf,
 5572     int sizeofcpy,
 5573     uint8_t copy_by_ref)
 5574 {
 5575         struct mbuf *m;
 5576         struct mbuf *appendchain;
 5577         caddr_t cp;
 5578         int len;
 5579 
 5580         if (endofchain == NULL) {
 5581                 /* error */
 5582 error_out:
 5583                 if (outchain)
 5584                         sctp_m_freem(outchain);
 5585                 return (NULL);
 5586         }
 5587         if (can_take_mbuf) {
 5588                 appendchain = clonechain;
 5589         } else {
 5590                 if (!copy_by_ref &&
 5591                     (sizeofcpy <= (int)((((sctp_mbuf_threshold_count - 1) * MLEN) + MHLEN)))
 5592                     ) {
 5593                         /* Its not in a cluster */
 5594                         if (*endofchain == NULL) {
 5595                                 /* lets get a mbuf cluster */
 5596                                 if (outchain == NULL) {
 5597                                         /* This is the general case */
 5598                         new_mbuf:
 5599                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
 5600                                         if (outchain == NULL) {
 5601                                                 goto error_out;
 5602                                         }
 5603                                         SCTP_BUF_LEN(outchain) = 0;
 5604                                         *endofchain = outchain;
 5605                                         /* get the prepend space */
 5606                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 5607                                 } else {
 5608                                         /*
 5609                                          * We really should not get a NULL
 5610                                          * in endofchain
 5611                                          */
 5612                                         /* find end */
 5613                                         m = outchain;
 5614                                         while (m) {
 5615                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 5616                                                         *endofchain = m;
 5617                                                         break;
 5618                                                 }
 5619                                                 m = SCTP_BUF_NEXT(m);
 5620                                         }
 5621                                         /* sanity */
 5622                                         if (*endofchain == NULL) {
 5623                                                 /*
 5624                                                  * huh, TSNH XXX maybe we
 5625                                                  * should panic
 5626                                                  */
 5627                                                 sctp_m_freem(outchain);
 5628                                                 goto new_mbuf;
 5629                                         }
 5630                                 }
 5631                                 /* get the new end of length */
 5632                                 len = M_TRAILINGSPACE(*endofchain);
 5633                         } else {
 5634                                 /* how much is left at the end? */
 5635                                 len = M_TRAILINGSPACE(*endofchain);
 5636                         }
 5637                         /* Find the end of the data, for appending */
 5638                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 5639 
 5640                         /* Now lets copy it out */
 5641                         if (len >= sizeofcpy) {
 5642                                 /* It all fits, copy it in */
 5643                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 5644                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 5645                         } else {
 5646                                 /* fill up the end of the chain */
 5647                                 if (len > 0) {
 5648                                         m_copydata(clonechain, 0, len, cp);
 5649                                         SCTP_BUF_LEN((*endofchain)) += len;
 5650                                         /* now we need another one */
 5651                                         sizeofcpy -= len;
 5652                                 }
 5653                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_HEADER);
 5654                                 if (m == NULL) {
 5655                                         /* We failed */
 5656                                         goto error_out;
 5657                                 }
 5658                                 SCTP_BUF_NEXT((*endofchain)) = m;
 5659                                 *endofchain = m;
 5660                                 cp = mtod((*endofchain), caddr_t);
 5661                                 m_copydata(clonechain, len, sizeofcpy, cp);
 5662                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 5663                         }
 5664                         return (outchain);
 5665                 } else {
 5666                         /* copy the old fashion way */
 5667                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_DONTWAIT);
 5668                 }
 5669         }
 5670         if (appendchain == NULL) {
 5671                 /* error */
 5672                 if (outchain)
 5673                         sctp_m_freem(outchain);
 5674                 return (NULL);
 5675         }
 5676         if (outchain) {
 5677                 /* tack on to the end */
 5678                 if (*endofchain != NULL) {
 5679                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 5680                 } else {
 5681                         m = outchain;
 5682                         while (m) {
 5683                                 if (SCTP_BUF_NEXT(m) == NULL) {
 5684                                         SCTP_BUF_NEXT(m) = appendchain;
 5685                                         break;
 5686                                 }
 5687                                 m = SCTP_BUF_NEXT(m);
 5688                         }
 5689                 }
 5690                 /*
 5691                  * save off the end and update the end-chain postion
 5692                  */
 5693                 m = appendchain;
 5694                 while (m) {
 5695                         if (SCTP_BUF_NEXT(m) == NULL) {
 5696                                 *endofchain = m;
 5697                                 break;
 5698                         }
 5699                         m = SCTP_BUF_NEXT(m);
 5700                 }
 5701                 return (outchain);
 5702         } else {
 5703                 /* save off the end and update the end-chain postion */
 5704                 m = appendchain;
 5705                 while (m) {
 5706                         if (SCTP_BUF_NEXT(m) == NULL) {
 5707                                 *endofchain = m;
 5708                                 break;
 5709                         }
 5710                         m = SCTP_BUF_NEXT(m);
 5711                 }
 5712                 return (appendchain);
 5713         }
 5714 }
 5715 
 5716 int
 5717 sctp_med_chunk_output(struct sctp_inpcb *inp,
 5718     struct sctp_tcb *stcb,
 5719     struct sctp_association *asoc,
 5720     int *num_out,
 5721     int *reason_code,
 5722     int control_only, int *cwnd_full, int from_where,
 5723     struct timeval *now, int *now_filled, int frag_point, int so_locked
 5724 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 5725     SCTP_UNUSED
 5726 #endif
 5727 );
 5728 
 5729 static void
 5730 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 5731     uint32_t val)
 5732 {
 5733         struct sctp_copy_all *ca;
 5734         struct mbuf *m;
 5735         int ret = 0;
 5736         int added_control = 0;
 5737         int un_sent, do_chunk_output = 1;
 5738         struct sctp_association *asoc;
 5739 
 5740         ca = (struct sctp_copy_all *)ptr;
 5741         if (ca->m == NULL) {
 5742                 return;
 5743         }
 5744         if (ca->inp != inp) {
 5745                 /* TSNH */
 5746                 return;
 5747         }
 5748         if ((ca->m) && ca->sndlen) {
 5749                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_DONTWAIT);
 5750                 if (m == NULL) {
 5751                         /* can't copy so we are done */
 5752                         ca->cnt_failed++;
 5753                         return;
 5754                 }
 5755         } else {
 5756                 m = NULL;
 5757         }
 5758         SCTP_TCB_LOCK_ASSERT(stcb);
 5759         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 5760                 /* Abort this assoc with m as the user defined reason */
 5761                 if (m) {
 5762                         struct sctp_paramhdr *ph;
 5763 
 5764                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_DONTWAIT);
 5765                         if (m) {
 5766                                 ph = mtod(m, struct sctp_paramhdr *);
 5767                                 ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 5768                                 ph->param_length = htons(ca->sndlen);
 5769                         }
 5770                         /*
 5771                          * We add one here to keep the assoc from
 5772                          * dis-appearing on us.
 5773                          */
 5774                         atomic_add_int(&stcb->asoc.refcnt, 1);
 5775                         sctp_abort_an_association(inp, stcb,
 5776                             SCTP_RESPONSE_TO_USER_REQ,
 5777                             m, SCTP_SO_NOT_LOCKED);
 5778                         /*
 5779                          * sctp_abort_an_association calls sctp_free_asoc()
 5780                          * free association will NOT free it since we
 5781                          * incremented the refcnt .. we do this to prevent
 5782                          * it being freed and things getting tricky since we
 5783                          * could end up (from free_asoc) calling inpcb_free
 5784                          * which would get a recursive lock call to the
 5785                          * iterator lock.. But as a consequence of that the
 5786                          * stcb will return to us un-locked.. since
 5787                          * free_asoc returns with either no TCB or the TCB
 5788                          * unlocked, we must relock.. to unlock in the
 5789                          * iterator timer :-0
 5790                          */
 5791                         SCTP_TCB_LOCK(stcb);
 5792                         atomic_add_int(&stcb->asoc.refcnt, -1);
 5793                         goto no_chunk_output;
 5794                 }
 5795         } else {
 5796                 if (m) {
 5797                         ret = sctp_msg_append(stcb, stcb->asoc.primary_destination, m,
 5798                             &ca->sndrcv, 1);
 5799                 }
 5800                 asoc = &stcb->asoc;
 5801                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 5802                         /* shutdown this assoc */
 5803                         int cnt;
 5804 
 5805                         cnt = sctp_is_there_unsent_data(stcb);
 5806 
 5807                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 5808                             TAILQ_EMPTY(&asoc->sent_queue) &&
 5809                             (cnt == 0)) {
 5810                                 if (asoc->locked_on_sending) {
 5811                                         goto abort_anyway;
 5812                                 }
 5813                                 /*
 5814                                  * there is nothing queued to send, so I'm
 5815                                  * done...
 5816                                  */
 5817                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 5818                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 5819                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 5820                                         /*
 5821                                          * only send SHUTDOWN the first time
 5822                                          * through
 5823                                          */
 5824                                         sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
 5825                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 5826                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 5827                                         }
 5828                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 5829                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 5830                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 5831                                             asoc->primary_destination);
 5832                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 5833                                             asoc->primary_destination);
 5834                                         added_control = 1;
 5835                                         do_chunk_output = 0;
 5836                                 }
 5837                         } else {
 5838                                 /*
 5839                                  * we still got (or just got) data to send,
 5840                                  * so set SHUTDOWN_PENDING
 5841                                  */
 5842                                 /*
 5843                                  * XXX sockets draft says that SCTP_EOF
 5844                                  * should be sent with no data.  currently,
 5845                                  * we will allow user data to be sent first
 5846                                  * and move to SHUTDOWN-PENDING
 5847                                  */
 5848                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 5849                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 5850                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 5851                                         if (asoc->locked_on_sending) {
 5852                                                 /*
 5853                                                  * Locked to send out the
 5854                                                  * data
 5855                                                  */
 5856                                                 struct sctp_stream_queue_pending *sp;
 5857 
 5858                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
 5859                                                 if (sp) {
 5860                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
 5861                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 5862                                                 }
 5863                                         }
 5864                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
 5865                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 5866                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 5867                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 5868                                 abort_anyway:
 5869                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 5870                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 5871                                                     SCTP_RESPONSE_TO_USER_REQ,
 5872                                                     NULL, SCTP_SO_NOT_LOCKED);
 5873                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 5874                                                 goto no_chunk_output;
 5875                                         }
 5876                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 5877                                             asoc->primary_destination);
 5878                                 }
 5879                         }
 5880 
 5881                 }
 5882         }
 5883         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 5884             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
 5885 
 5886         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 5887             (stcb->asoc.total_flight > 0) &&
 5888             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
 5889             ) {
 5890                 do_chunk_output = 0;
 5891         }
 5892         if (do_chunk_output)
 5893                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 5894         else if (added_control) {
 5895                 int num_out = 0, reason = 0, cwnd_full = 0, now_filled = 0;
 5896                 struct timeval now;
 5897                 int frag_point;
 5898 
 5899                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 5900                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 5901                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
 5902         }
 5903 no_chunk_output:
 5904         if (ret) {
 5905                 ca->cnt_failed++;
 5906         } else {
 5907                 ca->cnt_sent++;
 5908         }
 5909 }
 5910 
 5911 static void
 5912 sctp_sendall_completes(void *ptr, uint32_t val)
 5913 {
 5914         struct sctp_copy_all *ca;
 5915 
 5916         ca = (struct sctp_copy_all *)ptr;
 5917         /*
 5918          * Do a notify here? Kacheong suggests that the notify be done at
 5919          * the send time.. so you would push up a notification if any send
 5920          * failed. Don't know if this is feasable since the only failures we
 5921          * have is "memory" related and if you cannot get an mbuf to send
 5922          * the data you surely can't get an mbuf to send up to notify the
 5923          * user you can't send the data :->
 5924          */
 5925 
 5926         /* now free everything */
 5927         sctp_m_freem(ca->m);
 5928         SCTP_FREE(ca, SCTP_M_COPYAL);
 5929 }
 5930 
 5931 
 5932 #define MC_ALIGN(m, len) do {                                           \
 5933         SCTP_BUF_RESV_UF(m, ((MCLBYTES - (len)) & ~(sizeof(long) - 1)); \
 5934 } while (0)
 5935 
 5936 
 5937 
 5938 static struct mbuf *
 5939 sctp_copy_out_all(struct uio *uio, int len)
 5940 {
 5941         struct mbuf *ret, *at;
 5942         int left, willcpy, cancpy, error;
 5943 
 5944         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAIT, 1, MT_DATA);
 5945         if (ret == NULL) {
 5946                 /* TSNH */
 5947                 return (NULL);
 5948         }
 5949         left = len;
 5950         SCTP_BUF_LEN(ret) = 0;
 5951         /* save space for the data chunk header */
 5952         cancpy = M_TRAILINGSPACE(ret);
 5953         willcpy = min(cancpy, left);
 5954         at = ret;
 5955         while (left > 0) {
 5956                 /* Align data to the end */
 5957                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
 5958                 if (error) {
 5959         err_out_now:
 5960                         sctp_m_freem(at);
 5961                         return (NULL);
 5962                 }
 5963                 SCTP_BUF_LEN(at) = willcpy;
 5964                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 5965                 left -= willcpy;
 5966                 if (left > 0) {
 5967                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAIT, 1, MT_DATA);
 5968                         if (SCTP_BUF_NEXT(at) == NULL) {
 5969                                 goto err_out_now;
 5970                         }
 5971                         at = SCTP_BUF_NEXT(at);
 5972                         SCTP_BUF_LEN(at) = 0;
 5973                         cancpy = M_TRAILINGSPACE(at);
 5974                         willcpy = min(cancpy, left);
 5975                 }
 5976         }
 5977         return (ret);
 5978 }
 5979 
 5980 static int
 5981 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 5982     struct sctp_sndrcvinfo *srcv)
 5983 {
 5984         int ret;
 5985         struct sctp_copy_all *ca;
 5986 
 5987         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 5988             SCTP_M_COPYAL);
 5989         if (ca == NULL) {
 5990                 sctp_m_freem(m);
 5991                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 5992                 return (ENOMEM);
 5993         }
 5994         memset(ca, 0, sizeof(struct sctp_copy_all));
 5995 
 5996         ca->inp = inp;
 5997         memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 5998         /*
 5999          * take off the sendall flag, it would be bad if we failed to do
 6000          * this :-0
 6001          */
 6002         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 6003         /* get length and mbuf chain */
 6004         if (uio) {
 6005                 ca->sndlen = uio->uio_resid;
 6006                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 6007                 if (ca->m == NULL) {
 6008                         SCTP_FREE(ca, SCTP_M_COPYAL);
 6009                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6010                         return (ENOMEM);
 6011                 }
 6012         } else {
 6013                 /* Gather the length of the send */
 6014                 struct mbuf *mat;
 6015 
 6016                 mat = m;
 6017                 ca->sndlen = 0;
 6018                 while (m) {
 6019                         ca->sndlen += SCTP_BUF_LEN(m);
 6020                         m = SCTP_BUF_NEXT(m);
 6021                 }
 6022                 ca->m = mat;
 6023         }
 6024         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 6025             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 6026             SCTP_ASOC_ANY_STATE,
 6027             (void *)ca, 0,
 6028             sctp_sendall_completes, inp, 1);
 6029         if (ret) {
 6030                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
 6031                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6032                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 6033                 return (EFAULT);
 6034         }
 6035         return (0);
 6036 }
 6037 
 6038 
 6039 void
 6040 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6041 {
 6042         struct sctp_tmit_chunk *chk, *nchk;
 6043 
 6044         chk = TAILQ_FIRST(&asoc->control_send_queue);
 6045         while (chk) {
 6046                 nchk = TAILQ_NEXT(chk, sctp_next);
 6047                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 6048                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6049                         if (chk->data) {
 6050                                 sctp_m_freem(chk->data);
 6051                                 chk->data = NULL;
 6052                         }
 6053                         asoc->ctrl_queue_cnt--;
 6054                         sctp_free_a_chunk(stcb, chk);
 6055                 }
 6056                 chk = nchk;
 6057         }
 6058 }
 6059 
 6060 void
 6061 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 6062 {
 6063         struct sctp_association *asoc;
 6064         struct sctp_tmit_chunk *chk, *chk_tmp;
 6065 
 6066         asoc = &stcb->asoc;
 6067         for (chk = TAILQ_FIRST(&asoc->control_send_queue); chk != NULL;
 6068             chk = chk_tmp) {
 6069                 /* get next chk */
 6070                 chk_tmp = TAILQ_NEXT(chk, sctp_next);
 6071                 /* find SCTP_ASCONF chunk in queue (only one ever in queue) */
 6072                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 6073                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6074                         if (chk->data) {
 6075                                 sctp_m_freem(chk->data);
 6076                                 chk->data = NULL;
 6077                         }
 6078                         asoc->ctrl_queue_cnt--;
 6079                         sctp_free_a_chunk(stcb, chk);
 6080                 }
 6081         }
 6082 }
 6083 
 6084 
 6085 static void
 6086 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 6087 
 6088     struct sctp_association *asoc,
 6089     struct sctp_tmit_chunk **data_list,
 6090     int bundle_at,
 6091     struct sctp_nets *net)
 6092 {
 6093         int i;
 6094         struct sctp_tmit_chunk *tp1;
 6095 
 6096         for (i = 0; i < bundle_at; i++) {
 6097                 /* off of the send queue */
 6098                 if (i) {
 6099                         /*
 6100                          * Any chunk NOT 0 you zap the time chunk 0 gets
 6101                          * zapped or set based on if a RTO measurment is
 6102                          * needed.
 6103                          */
 6104                         data_list[i]->do_rtt = 0;
 6105                 }
 6106                 /* record time */
 6107                 data_list[i]->sent_rcv_time = net->last_sent_time;
 6108                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
 6109                 TAILQ_REMOVE(&asoc->send_queue,
 6110                     data_list[i],
 6111                     sctp_next);
 6112                 /* on to the sent queue */
 6113                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 6114                 if ((tp1) && (compare_with_wrap(tp1->rec.data.TSN_seq,
 6115                     data_list[i]->rec.data.TSN_seq, MAX_TSN))) {
 6116                         struct sctp_tmit_chunk *tpp;
 6117 
 6118                         /* need to move back */
 6119         back_up_more:
 6120                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 6121                         if (tpp == NULL) {
 6122                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 6123                                 goto all_done;
 6124                         }
 6125                         tp1 = tpp;
 6126                         if (compare_with_wrap(tp1->rec.data.TSN_seq,
 6127                             data_list[i]->rec.data.TSN_seq, MAX_TSN)) {
 6128                                 goto back_up_more;
 6129                         }
 6130                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 6131                 } else {
 6132                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 6133                             data_list[i],
 6134                             sctp_next);
 6135                 }
 6136 all_done:
 6137                 /* This does not lower until the cum-ack passes it */
 6138                 asoc->sent_queue_cnt++;
 6139                 asoc->send_queue_cnt--;
 6140                 if ((asoc->peers_rwnd <= 0) &&
 6141                     (asoc->total_flight == 0) &&
 6142                     (bundle_at == 1)) {
 6143                         /* Mark the chunk as being a window probe */
 6144                         SCTP_STAT_INCR(sctps_windowprobed);
 6145                 }
 6146 #ifdef SCTP_AUDITING_ENABLED
 6147                 sctp_audit_log(0xC2, 3);
 6148 #endif
 6149                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 6150                 data_list[i]->snd_count = 1;
 6151                 data_list[i]->rec.data.chunk_was_revoked = 0;
 6152                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 6153                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 6154                             data_list[i]->whoTo->flight_size,
 6155                             data_list[i]->book_size,
 6156                             (uintptr_t) data_list[i]->whoTo,
 6157                             data_list[i]->rec.data.TSN_seq);
 6158                 }
 6159                 sctp_flight_size_increase(data_list[i]);
 6160                 sctp_total_flight_increase(stcb, data_list[i]);
 6161                 if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 6162                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 6163                             asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
 6164                 }
 6165                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 6166                     (uint32_t) (data_list[i]->send_size + sctp_peer_chunk_oh));
 6167                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 6168                         /* SWS sender side engages */
 6169                         asoc->peers_rwnd = 0;
 6170                 }
 6171         }
 6172 }
 6173 
 6174 static void
 6175 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6176 {
 6177         struct sctp_tmit_chunk *chk, *nchk;
 6178 
 6179         for (chk = TAILQ_FIRST(&asoc->control_send_queue);
 6180             chk; chk = nchk) {
 6181                 nchk = TAILQ_NEXT(chk, sctp_next);
 6182                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 6183                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 6184                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 6185                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 6186                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 6187                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 6188                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 6189                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 6190                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 6191                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 6192                         /* Stray chunks must be cleaned up */
 6193         clean_up_anyway:
 6194                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6195                         if (chk->data) {
 6196                                 sctp_m_freem(chk->data);
 6197                                 chk->data = NULL;
 6198                         }
 6199                         asoc->ctrl_queue_cnt--;
 6200                         sctp_free_a_chunk(stcb, chk);
 6201                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 6202                         /* special handling, we must look into the param */
 6203                         if (chk != asoc->str_reset) {
 6204                                 goto clean_up_anyway;
 6205                         }
 6206                 }
 6207         }
 6208 }
 6209 
 6210 
 6211 static int
 6212 sctp_can_we_split_this(struct sctp_tcb *stcb,
 6213     uint32_t length,
 6214     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
 6215 {
 6216         /*
 6217          * Make a decision on if I should split a msg into multiple parts.
 6218          * This is only asked of incomplete messages.
 6219          */
 6220         if (eeor_on) {
 6221                 /*
 6222                  * If we are doing EEOR we need to always send it if its the
 6223                  * entire thing, since it might be all the guy is putting in
 6224                  * the hopper.
 6225                  */
 6226                 if (goal_mtu >= length) {
 6227                         /*-
 6228                          * If we have data outstanding,
 6229                          * we get another chance when the sack
 6230                          * arrives to transmit - wait for more data
 6231                          */
 6232                         if (stcb->asoc.total_flight == 0) {
 6233                                 /*
 6234                                  * If nothing is in flight, we zero the
 6235                                  * packet counter.
 6236                                  */
 6237                                 return (length);
 6238                         }
 6239                         return (0);
 6240 
 6241                 } else {
 6242                         /* You can fill the rest */
 6243                         return (goal_mtu);
 6244                 }
 6245         }
 6246         /*-
 6247          * For those strange folk that make the send buffer
 6248          * smaller than our fragmentation point, we can't
 6249          * get a full msg in so we have to allow splitting.
 6250          */
 6251         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 6252                 return (length);
 6253         }
 6254         if ((length <= goal_mtu) ||
 6255             ((length - goal_mtu) < sctp_min_residual)) {
 6256                 /* Sub-optimial residual don't split in non-eeor mode. */
 6257                 return (0);
 6258         }
 6259         /*
 6260          * If we reach here length is larger than the goal_mtu. Do we wish
 6261          * to split it for the sake of packet putting together?
 6262          */
 6263         if (goal_mtu >= min(sctp_min_split_point, frag_point)) {
 6264                 /* Its ok to split it */
 6265                 return (min(goal_mtu, frag_point));
 6266         }
 6267         /* Nope, can't split */
 6268         return (0);
 6269 
 6270 }
 6271 
 6272 static uint32_t
 6273 sctp_move_to_outqueue(struct sctp_tcb *stcb, struct sctp_nets *net,
 6274     struct sctp_stream_out *strq,
 6275     uint32_t goal_mtu,
 6276     uint32_t frag_point,
 6277     int *locked,
 6278     int *giveup,
 6279     int eeor_mode,
 6280     int *bail)
 6281 {
 6282         /* Move from the stream to the send_queue keeping track of the total */
 6283         struct sctp_association *asoc;
 6284         struct sctp_stream_queue_pending *sp;
 6285         struct sctp_tmit_chunk *chk;
 6286         struct sctp_data_chunk *dchkh;
 6287         uint32_t to_move, length;
 6288         uint8_t rcv_flags = 0;
 6289         uint8_t some_taken;
 6290         uint8_t send_lock_up = 0;
 6291 
 6292         SCTP_TCB_LOCK_ASSERT(stcb);
 6293         asoc = &stcb->asoc;
 6294 one_more_time:
 6295         /* sa_ignore FREED_MEMORY */
 6296         sp = TAILQ_FIRST(&strq->outqueue);
 6297         if (sp == NULL) {
 6298                 *locked = 0;
 6299                 if (send_lock_up == 0) {
 6300                         SCTP_TCB_SEND_LOCK(stcb);
 6301                         send_lock_up = 1;
 6302                 }
 6303                 sp = TAILQ_FIRST(&strq->outqueue);
 6304                 if (sp) {
 6305                         goto one_more_time;
 6306                 }
 6307                 if (strq->last_msg_incomplete) {
 6308                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 6309                             strq->stream_no,
 6310                             strq->last_msg_incomplete);
 6311                         strq->last_msg_incomplete = 0;
 6312                 }
 6313                 to_move = 0;
 6314                 if (send_lock_up) {
 6315                         SCTP_TCB_SEND_UNLOCK(stcb);
 6316                         send_lock_up = 0;
 6317                 }
 6318                 goto out_of;
 6319         }
 6320         if ((sp->msg_is_complete) && (sp->length == 0)) {
 6321                 if (sp->sender_all_done) {
 6322                         /*
 6323                          * We are doing differed cleanup. Last time through
 6324                          * when we took all the data the sender_all_done was
 6325                          * not set.
 6326                          */
 6327                         if (sp->put_last_out == 0) {
 6328                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 6329                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 6330                                     sp->sender_all_done,
 6331                                     sp->length,
 6332                                     sp->msg_is_complete,
 6333                                     sp->put_last_out,
 6334                                     send_lock_up);
 6335                         }
 6336                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
 6337                                 SCTP_TCB_SEND_LOCK(stcb);
 6338                                 send_lock_up = 1;
 6339                         }
 6340                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 6341                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 6342                         sctp_free_remote_addr(sp->net);
 6343                         if (sp->data) {
 6344                                 sctp_m_freem(sp->data);
 6345                                 sp->data = NULL;
 6346                         }
 6347                         sctp_free_a_strmoq(stcb, sp);
 6348 
 6349                         /* we can't be locked to it */
 6350                         *locked = 0;
 6351                         stcb->asoc.locked_on_sending = NULL;
 6352                         if (send_lock_up) {
 6353                                 SCTP_TCB_SEND_UNLOCK(stcb);
 6354                                 send_lock_up = 0;
 6355                         }
 6356                         /* back to get the next msg */
 6357                         goto one_more_time;
 6358                 } else {
 6359                         /*
 6360                          * sender just finished this but still holds a
 6361                          * reference
 6362                          */
 6363                         *locked = 1;
 6364                         *giveup = 1;
 6365                         to_move = 0;
 6366                         goto out_of;
 6367                 }
 6368         } else {
 6369                 /* is there some to get */
 6370                 if (sp->length == 0) {
 6371                         /* no */
 6372                         *locked = 1;
 6373                         *giveup = 1;
 6374                         to_move = 0;
 6375                         goto out_of;
 6376                 }
 6377         }
 6378         some_taken = sp->some_taken;
 6379         if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
 6380                 sp->msg_is_complete = 1;
 6381         }
 6382 re_look:
 6383         length = sp->length;
 6384         if (sp->msg_is_complete) {
 6385                 /* The message is complete */
 6386                 to_move = min(length, frag_point);
 6387                 if (to_move == length) {
 6388                         /* All of it fits in the MTU */
 6389                         if (sp->some_taken) {
 6390                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 6391                                 sp->put_last_out = 1;
 6392                         } else {
 6393                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 6394                                 sp->put_last_out = 1;
 6395                         }
 6396                 } else {
 6397                         /* Not all of it fits, we fragment */
 6398                         if (sp->some_taken == 0) {
 6399                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 6400                         }
 6401                         sp->some_taken = 1;
 6402                 }
 6403         } else {
 6404                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu,
 6405                     frag_point, eeor_mode);
 6406                 if (to_move) {
 6407                         /*-
 6408                          * We use a snapshot of length in case it
 6409                          * is expanding during the compare.
 6410                          */
 6411                         uint32_t llen;
 6412 
 6413                         llen = length;
 6414                         if (to_move >= llen) {
 6415                                 to_move = llen;
 6416                                 if (send_lock_up == 0) {
 6417                                         /*-
 6418                                          * We are taking all of an incomplete msg
 6419                                          * thus we need a send lock.
 6420                                          */
 6421                                         SCTP_TCB_SEND_LOCK(stcb);
 6422                                         send_lock_up = 1;
 6423                                         if (sp->msg_is_complete) {
 6424                                                 /*
 6425                                                  * the sender finished the
 6426                                                  * msg
 6427                                                  */
 6428                                                 goto re_look;
 6429                                         }
 6430                                 }
 6431                         }
 6432                         if (sp->some_taken == 0) {
 6433                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 6434                                 sp->some_taken = 1;
 6435                         }
 6436                 } else {
 6437                         /* Nothing to take. */
 6438                         if (sp->some_taken) {
 6439                                 *locked = 1;
 6440                         }
 6441                         *giveup = 1;
 6442                         to_move = 0;
 6443                         goto out_of;
 6444                 }
 6445         }
 6446 
 6447         /* If we reach here, we can copy out a chunk */
 6448         sctp_alloc_a_chunk(stcb, chk);
 6449         if (chk == NULL) {
 6450                 /* No chunk memory */
 6451                 *giveup = 1;
 6452                 to_move = 0;
 6453                 goto out_of;
 6454         }
 6455         /*
 6456          * Setup for unordered if needed by looking at the user sent info
 6457          * flags.
 6458          */
 6459         if (sp->sinfo_flags & SCTP_UNORDERED) {
 6460                 rcv_flags |= SCTP_DATA_UNORDERED;
 6461         }
 6462         /* clear out the chunk before setting up */
 6463         memset(chk, 0, sizeof(*chk));
 6464         chk->rec.data.rcv_flags = rcv_flags;
 6465 
 6466         if (to_move >= length) {
 6467                 /* we think we can steal the whole thing */
 6468                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
 6469                         SCTP_TCB_SEND_LOCK(stcb);
 6470                         send_lock_up = 1;
 6471                 }
 6472                 if (to_move < sp->length) {
 6473                         /* bail, it changed */
 6474                         goto dont_do_it;
 6475                 }
 6476                 chk->data = sp->data;
 6477                 chk->last_mbuf = sp->tail_mbuf;
 6478                 /* register the stealing */
 6479                 sp->data = sp->tail_mbuf = NULL;
 6480         } else {
 6481                 struct mbuf *m;
 6482 
 6483 dont_do_it:
 6484                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_DONTWAIT);
 6485                 chk->last_mbuf = NULL;
 6486                 if (chk->data == NULL) {
 6487                         sp->some_taken = some_taken;
 6488                         sctp_free_a_chunk(stcb, chk);
 6489                         *bail = 1;
 6490                         to_move = 0;
 6491                         goto out_of;
 6492                 }
 6493                 /* Pull off the data */
 6494                 m_adj(sp->data, to_move);
 6495                 /* Now lets work our way down and compact it */
 6496                 m = sp->data;
 6497                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 6498                         sp->data = SCTP_BUF_NEXT(m);
 6499                         SCTP_BUF_NEXT(m) = NULL;
 6500                         if (sp->tail_mbuf == m) {
 6501                                 /*-
 6502                                  * Freeing tail? TSNH since
 6503                                  * we supposedly were taking less
 6504                                  * than the sp->length.
 6505                                  */
 6506 #ifdef INVARIANTS
 6507                                 panic("Huh, freing tail? - TSNH");
 6508 #else
 6509                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 6510                                 sp->tail_mbuf = sp->data = NULL;
 6511                                 sp->length = 0;
 6512 #endif
 6513 
 6514                         }
 6515                         sctp_m_free(m);
 6516                         m = sp->data;
 6517                 }
 6518         }
 6519         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 6520                 chk->copy_by_ref = 1;
 6521         } else {
 6522                 chk->copy_by_ref = 0;
 6523         }
 6524         /*
 6525          * get last_mbuf and counts of mb useage This is ugly but hopefully
 6526          * its only one mbuf.
 6527          */
 6528         if (chk->last_mbuf == NULL) {
 6529                 chk->last_mbuf = chk->data;
 6530                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 6531                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 6532                 }
 6533         }
 6534         if (to_move > length) {
 6535                 /*- This should not happen either
 6536                  * since we always lower to_move to the size
 6537                  * of sp->length if its larger.
 6538                  */
 6539 #ifdef INVARIANTS
 6540                 panic("Huh, how can to_move be larger?");
 6541 #else
 6542                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 6543                 sp->length = 0;
 6544 #endif
 6545         } else {
 6546                 atomic_subtract_int(&sp->length, to_move);
 6547         }
 6548         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
 6549                 /* Not enough room for a chunk header, get some */
 6550                 struct mbuf *m;
 6551 
 6552                 m = sctp_get_mbuf_for_msg(1, 0, M_DONTWAIT, 0, MT_DATA);
 6553                 if (m == NULL) {
 6554                         /*
 6555                          * we're in trouble here. _PREPEND below will free
 6556                          * all the data if there is no leading space, so we
 6557                          * must put the data back and restore.
 6558                          */
 6559                         if (send_lock_up == 0) {
 6560                                 SCTP_TCB_SEND_LOCK(stcb);
 6561                                 send_lock_up = 1;
 6562                         }
 6563                         if (chk->data == NULL) {
 6564                                 /* unsteal the data */
 6565                                 sp->data = chk->data;
 6566                                 sp->tail_mbuf = chk->last_mbuf;
 6567                         } else {
 6568                                 struct mbuf *m_tmp;
 6569 
 6570                                 /* reassemble the data */
 6571                                 m_tmp = sp->data;
 6572                                 sp->data = chk->data;
 6573                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 6574                         }
 6575                         sp->some_taken = some_taken;
 6576                         atomic_add_int(&sp->length, to_move);
 6577                         chk->data = NULL;
 6578                         *bail = 1;
 6579                         sctp_free_a_chunk(stcb, chk);
 6580                         to_move = 0;
 6581                         goto out_of;
 6582                 } else {
 6583                         SCTP_BUF_LEN(m) = 0;
 6584                         SCTP_BUF_NEXT(m) = chk->data;
 6585                         chk->data = m;
 6586                         M_ALIGN(chk->data, 4);
 6587                 }
 6588         }
 6589         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_DONTWAIT);
 6590         if (chk->data == NULL) {
 6591                 /* HELP, TSNH since we assured it would not above? */
 6592 #ifdef INVARIANTS
 6593                 panic("prepend failes HELP?");
 6594 #else
 6595                 SCTP_PRINTF("prepend fails HELP?\n");
 6596                 sctp_free_a_chunk(stcb, chk);
 6597 #endif
 6598                 *bail = 1;
 6599                 to_move = 0;
 6600                 goto out_of;
 6601         }
 6602         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
 6603         chk->book_size = chk->send_size = (to_move +
 6604             sizeof(struct sctp_data_chunk));
 6605         chk->book_size_scale = 0;
 6606         chk->sent = SCTP_DATAGRAM_UNSENT;
 6607 
 6608         chk->flags = 0;
 6609         chk->asoc = &stcb->asoc;
 6610         chk->pad_inplace = 0;
 6611         chk->no_fr_allowed = 0;
 6612         chk->rec.data.stream_seq = sp->strseq;
 6613         chk->rec.data.stream_number = sp->stream;
 6614         chk->rec.data.payloadtype = sp->ppid;
 6615         chk->rec.data.context = sp->context;
 6616         chk->rec.data.doing_fast_retransmit = 0;
 6617         chk->rec.data.ect_nonce = 0;    /* ECN Nonce */
 6618 
 6619         chk->rec.data.timetodrop = sp->ts;
 6620         chk->flags = sp->act_flags;
 6621         chk->addr_over = sp->addr_over;
 6622 
 6623         chk->whoTo = net;
 6624         atomic_add_int(&chk->whoTo->ref_count, 1);
 6625 
 6626         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
 6627         if (sctp_logging_level & SCTP_LOG_AT_SEND_2_OUTQ) {
 6628                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 6629                     (uintptr_t) stcb, sp->length,
 6630                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
 6631                     chk->rec.data.TSN_seq);
 6632         }
 6633         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 6634         /*
 6635          * Put the rest of the things in place now. Size was done earlier in
 6636          * previous loop prior to padding.
 6637          */
 6638 
 6639 #ifdef SCTP_ASOCLOG_OF_TSNS
 6640         SCTP_TCB_LOCK_ASSERT(stcb);
 6641         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 6642                 asoc->tsn_out_at = 0;
 6643                 asoc->tsn_out_wrapped = 1;
 6644         }
 6645         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
 6646         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
 6647         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
 6648         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 6649         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 6650         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 6651         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 6652         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 6653         asoc->tsn_out_at++;
 6654 #endif
 6655 
 6656         dchkh->ch.chunk_type = SCTP_DATA;
 6657         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 6658         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
 6659         dchkh->dp.stream_id = htons(strq->stream_no);
 6660         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
 6661         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
 6662         dchkh->ch.chunk_length = htons(chk->send_size);
 6663         /* Now advance the chk->send_size by the actual pad needed. */
 6664         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 6665                 /* need a pad */
 6666                 struct mbuf *lm;
 6667                 int pads;
 6668 
 6669                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 6670                 if (sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf) == 0) {
 6671                         chk->pad_inplace = 1;
 6672                 }
 6673                 if ((lm = SCTP_BUF_NEXT(chk->last_mbuf)) != NULL) {
 6674                         /* pad added an mbuf */
 6675                         chk->last_mbuf = lm;
 6676                 }
 6677                 chk->send_size += pads;
 6678         }
 6679         /* We only re-set the policy if it is on */
 6680         if (sp->pr_sctp_on) {
 6681                 sctp_set_prsctp_policy(stcb, sp);
 6682                 asoc->pr_sctp_cnt++;
 6683                 chk->pr_sctp_on = 1;
 6684         } else {
 6685                 chk->pr_sctp_on = 0;
 6686         }
 6687         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 6688                 /* All done pull and kill the message */
 6689                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 6690                 if (sp->put_last_out == 0) {
 6691                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 6692                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 6693                             sp->sender_all_done,
 6694                             sp->length,
 6695                             sp->msg_is_complete,
 6696                             sp->put_last_out,
 6697                             send_lock_up);
 6698                 }
 6699                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
 6700                         SCTP_TCB_SEND_LOCK(stcb);
 6701                         send_lock_up = 1;
 6702                 }
 6703                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 6704                 sctp_free_remote_addr(sp->net);
 6705                 if (sp->data) {
 6706                         sctp_m_freem(sp->data);
 6707                         sp->data = NULL;
 6708                 }
 6709                 sctp_free_a_strmoq(stcb, sp);
 6710 
 6711                 /* we can't be locked to it */
 6712                 *locked = 0;
 6713                 stcb->asoc.locked_on_sending = NULL;
 6714         } else {
 6715                 /* more to go, we are locked */
 6716                 *locked = 1;
 6717         }
 6718         asoc->chunks_on_out_queue++;
 6719         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 6720         asoc->send_queue_cnt++;
 6721 out_of:
 6722         if (send_lock_up) {
 6723                 SCTP_TCB_SEND_UNLOCK(stcb);
 6724                 send_lock_up = 0;
 6725         }
 6726         return (to_move);
 6727 }
 6728 
 6729 
 6730 static struct sctp_stream_out *
 6731 sctp_select_a_stream(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6732 {
 6733         struct sctp_stream_out *strq;
 6734 
 6735         /* Find the next stream to use */
 6736         if (asoc->last_out_stream == NULL) {
 6737                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
 6738                 if (asoc->last_out_stream == NULL) {
 6739                         /* huh nothing on the wheel, TSNH */
 6740                         return (NULL);
 6741                 }
 6742                 goto done_it;
 6743         }
 6744         strq = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
 6745 done_it:
 6746         if (strq == NULL) {
 6747                 strq = asoc->last_out_stream = TAILQ_FIRST(&asoc->out_wheel);
 6748         }
 6749         /* Save off the last stream */
 6750         asoc->last_out_stream = strq;
 6751         return (strq);
 6752 
 6753 }
 6754 
 6755 
 6756 static void
 6757 sctp_fill_outqueue(struct sctp_tcb *stcb,
 6758     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now)
 6759 {
 6760         struct sctp_association *asoc;
 6761         struct sctp_stream_out *strq, *strqn, *strqt;
 6762         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
 6763         int locked, giveup;
 6764         struct sctp_stream_queue_pending *sp;
 6765 
 6766         SCTP_TCB_LOCK_ASSERT(stcb);
 6767         asoc = &stcb->asoc;
 6768 #ifdef INET6
 6769         if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
 6770                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
 6771         } else {
 6772                 /* ?? not sure what else to do */
 6773                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 6774         }
 6775 #else
 6776         goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
 6777         mtu_fromwheel = 0;
 6778 #endif
 6779         /* Need an allowance for the data chunk header too */
 6780         goal_mtu -= sizeof(struct sctp_data_chunk);
 6781 
 6782         /* must make even word boundary */
 6783         goal_mtu &= 0xfffffffc;
 6784         if (asoc->locked_on_sending) {
 6785                 /* We are stuck on one stream until the message completes. */
 6786                 strqn = strq = asoc->locked_on_sending;
 6787                 locked = 1;
 6788         } else {
 6789                 strqn = strq = sctp_select_a_stream(stcb, asoc);
 6790                 locked = 0;
 6791         }
 6792 
 6793         while ((goal_mtu > 0) && strq) {
 6794                 sp = TAILQ_FIRST(&strq->outqueue);
 6795                 /*
 6796                  * If CMT is off, we must validate that the stream in
 6797                  * question has the first item pointed towards are network
 6798                  * destionation requested by the caller. Note that if we
 6799                  * turn out to be locked to a stream (assigning TSN's then
 6800                  * we must stop, since we cannot look for another stream
 6801                  * with data to send to that destination). In CMT's case, by
 6802                  * skipping this check, we will send one data packet towards
 6803                  * the requested net.
 6804                  */
 6805                 if (sp == NULL) {
 6806                         break;
 6807                 }
 6808                 if ((sp->net != net) && (sctp_cmt_on_off == 0)) {
 6809                         /* none for this network */
 6810                         if (locked) {
 6811                                 break;
 6812                         } else {
 6813                                 strq = sctp_select_a_stream(stcb, asoc);
 6814                                 if (strq == NULL)
 6815                                         /* none left */
 6816                                         break;
 6817                                 if (strqn == strq) {
 6818                                         /* I have circled */
 6819                                         break;
 6820                                 }
 6821                                 continue;
 6822                         }
 6823                 }
 6824                 giveup = 0;
 6825                 bail = 0;
 6826                 moved_how_much = sctp_move_to_outqueue(stcb, net, strq, goal_mtu, frag_point, &locked,
 6827                     &giveup, eeor_mode, &bail);
 6828                 asoc->last_out_stream = strq;
 6829                 if (locked) {
 6830                         asoc->locked_on_sending = strq;
 6831                         if ((moved_how_much == 0) || (giveup) || bail)
 6832                                 /* no more to move for now */
 6833                                 break;
 6834                 } else {
 6835                         asoc->locked_on_sending = NULL;
 6836                         strqt = sctp_select_a_stream(stcb, asoc);
 6837                         if (TAILQ_FIRST(&strq->outqueue) == NULL) {
 6838                                 if (strq == strqn) {
 6839                                         /* Must move start to next one */
 6840                                         strqn = TAILQ_NEXT(asoc->last_out_stream, next_spoke);
 6841                                         if (strqn == NULL) {
 6842                                                 strqn = TAILQ_FIRST(&asoc->out_wheel);
 6843                                                 if (strqn == NULL) {
 6844                                                         break;
 6845                                                 }
 6846                                         }
 6847                                 }
 6848                                 sctp_remove_from_wheel(stcb, asoc, strq);
 6849                         }
 6850                         if ((giveup) || bail) {
 6851                                 break;
 6852                         }
 6853                         strq = strqt;
 6854                         if (strq == NULL) {
 6855                                 break;
 6856                         }
 6857                 }
 6858                 total_moved += moved_how_much;
 6859                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
 6860                 goal_mtu &= 0xfffffffc;
 6861         }
 6862         if (bail)
 6863                 *quit_now = 1;
 6864 
 6865         if (total_moved == 0) {
 6866                 if ((sctp_cmt_on_off == 0) &&
 6867                     (net == stcb->asoc.primary_destination)) {
 6868                         /* ran dry for primary network net */
 6869                         SCTP_STAT_INCR(sctps_primary_randry);
 6870                 } else if (sctp_cmt_on_off) {
 6871                         /* ran dry with CMT on */
 6872                         SCTP_STAT_INCR(sctps_cmt_randry);
 6873                 }
 6874         }
 6875 }
 6876 
 6877 void
 6878 sctp_fix_ecn_echo(struct sctp_association *asoc)
 6879 {
 6880         struct sctp_tmit_chunk *chk;
 6881 
 6882         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 6883                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 6884                         chk->sent = SCTP_DATAGRAM_UNSENT;
 6885                 }
 6886         }
 6887 }
 6888 
 6889 static void
 6890 sctp_move_to_an_alt(struct sctp_tcb *stcb,
 6891     struct sctp_association *asoc,
 6892     struct sctp_nets *net)
 6893 {
 6894         struct sctp_tmit_chunk *chk;
 6895         struct sctp_nets *a_net;
 6896 
 6897         SCTP_TCB_LOCK_ASSERT(stcb);
 6898         /*
 6899          * JRS 5/14/07 - If CMT PF is turned on, find an alternate
 6900          * destination using the PF algorithm for finding alternate
 6901          * destinations.
 6902          */
 6903         if (sctp_cmt_on_off && sctp_cmt_pf) {
 6904                 a_net = sctp_find_alternate_net(stcb, net, 2);
 6905         } else {
 6906                 a_net = sctp_find_alternate_net(stcb, net, 0);
 6907         }
 6908         if ((a_net != net) &&
 6909             ((a_net->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE)) {
 6910                 /*
 6911                  * We only proceed if a valid alternate is found that is not
 6912                  * this one and is reachable. Here we must move all chunks
 6913                  * queued in the send queue off of the destination address
 6914                  * to our alternate.
 6915                  */
 6916                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 6917                         if (chk->whoTo == net) {
 6918                                 /* Move the chunk to our alternate */
 6919                                 sctp_free_remote_addr(chk->whoTo);
 6920                                 chk->whoTo = a_net;
 6921                                 atomic_add_int(&a_net->ref_count, 1);
 6922                         }
 6923                 }
 6924         }
 6925 }
 6926 
 6927 int
 6928 sctp_med_chunk_output(struct sctp_inpcb *inp,
 6929     struct sctp_tcb *stcb,
 6930     struct sctp_association *asoc,
 6931     int *num_out,
 6932     int *reason_code,
 6933     int control_only, int *cwnd_full, int from_where,
 6934     struct timeval *now, int *now_filled, int frag_point, int so_locked
 6935 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 6936     SCTP_UNUSED
 6937 #endif
 6938 )
 6939 {
 6940         /*
 6941          * Ok this is the generic chunk service queue. we must do the
 6942          * following: - Service the stream queue that is next, moving any
 6943          * message (note I must get a complete message i.e. FIRST/MIDDLE and
 6944          * LAST to the out queue in one pass) and assigning TSN's - Check to
 6945          * see if the cwnd/rwnd allows any output, if so we go ahead and
 6946          * fomulate and send the low level chunks. Making sure to combine
 6947          * any control in the control chunk queue also.
 6948          */
 6949         struct sctp_nets *net;
 6950         struct mbuf *outchain, *endoutchain;
 6951         struct sctp_tmit_chunk *chk, *nchk;
 6952         struct sctphdr *shdr;
 6953 
 6954         /* temp arrays for unlinking */
 6955         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 6956         int no_fragmentflg, error;
 6957         int one_chunk, hbflag, skip_data_for_this_net;
 6958         int asconf, cookie, no_out_cnt;
 6959         int bundle_at, ctl_cnt, no_data_chunks, cwnd_full_ind, eeor_mode;
 6960         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 6961         struct sctp_nets *start_at, *old_startat = NULL, *send_start_at;
 6962         int tsns_sent = 0;
 6963         uint32_t auth_offset = 0;
 6964         struct sctp_auth_chunk *auth = NULL;
 6965 
 6966         /*
 6967          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 6968          * destination.
 6969          */
 6970         int pf_hbflag = 0;
 6971         int quit_now = 0;
 6972 
 6973         *num_out = 0;
 6974         cwnd_full_ind = 0;
 6975 
 6976         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 6977             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
 6978             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 6979                 eeor_mode = 1;
 6980         } else {
 6981                 eeor_mode = 0;
 6982         }
 6983         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 6984         /*
 6985          * First lets prime the pump. For each destination, if there is room
 6986          * in the flight size, attempt to pull an MTU's worth out of the
 6987          * stream queues into the general send_queue
 6988          */
 6989 #ifdef SCTP_AUDITING_ENABLED
 6990         sctp_audit_log(0xC2, 2);
 6991 #endif
 6992         SCTP_TCB_LOCK_ASSERT(stcb);
 6993         hbflag = 0;
 6994         if ((control_only) || (asoc->stream_reset_outstanding))
 6995                 no_data_chunks = 1;
 6996         else
 6997                 no_data_chunks = 0;
 6998 
 6999         /* Nothing to possible to send? */
 7000         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 7001             TAILQ_EMPTY(&asoc->send_queue) &&
 7002             TAILQ_EMPTY(&asoc->out_wheel)) {
 7003                 *reason_code = 9;
 7004                 return (0);
 7005         }
 7006         if (asoc->peers_rwnd == 0) {
 7007                 /* No room in peers rwnd */
 7008                 *cwnd_full = 1;
 7009                 *reason_code = 1;
 7010                 if (asoc->total_flight > 0) {
 7011                         /* we are allowed one chunk in flight */
 7012                         no_data_chunks = 1;
 7013                 }
 7014         }
 7015         if ((no_data_chunks == 0) && (!TAILQ_EMPTY(&asoc->out_wheel))) {
 7016                 if (sctp_cmt_on_off) {
 7017                         /*
 7018                          * for CMT we start at the next one past the one we
 7019                          * last added data to.
 7020                          */
 7021                         if (TAILQ_FIRST(&asoc->send_queue) != NULL) {
 7022                                 goto skip_the_fill_from_streams;
 7023                         }
 7024                         if (asoc->last_net_data_came_from) {
 7025                                 net = TAILQ_NEXT(asoc->last_net_data_came_from, sctp_next);
 7026                                 if (net == NULL) {
 7027                                         net = TAILQ_FIRST(&asoc->nets);
 7028                                 }
 7029                         } else {
 7030                                 /* back to start */
 7031                                 net = TAILQ_FIRST(&asoc->nets);
 7032                         }
 7033 
 7034                         /*
 7035                          * JRI-TODO: CMT-MPI. Simply set the first
 7036                          * destination (net) to be optimized for the next
 7037                          * message to be pulled out of the outwheel. 1. peek
 7038                          * at outwheel 2. If large message, set net =
 7039                          * highest_cwnd 3. If small message, set net =
 7040                          * lowest rtt
 7041                          */
 7042                 } else {
 7043                         net = asoc->primary_destination;
 7044                         if (net == NULL) {
 7045                                 /* TSNH */
 7046                                 net = TAILQ_FIRST(&asoc->nets);
 7047                         }
 7048                 }
 7049                 start_at = net;
 7050 
 7051 one_more_time:
 7052                 for (; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 7053                         net->window_probe = 0;
 7054                         if (old_startat && (old_startat == net)) {
 7055                                 break;
 7056                         }
 7057                         /*
 7058                          * JRI: if dest is unreachable or unconfirmed, do
 7059                          * not send data to it
 7060                          */
 7061                         if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) || (net->dest_state & SCTP_ADDR_UNCONFIRMED)) {
 7062                                 continue;
 7063                         }
 7064                         /*
 7065                          * JRI: if dest is in PF state, do not send data to
 7066                          * it
 7067                          */
 7068                         if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF)) {
 7069                                 continue;
 7070                         }
 7071                         if ((sctp_cmt_on_off == 0) && (net->ref_count < 2)) {
 7072                                 /* nothing can be in queue for this guy */
 7073                                 continue;
 7074                         }
 7075                         if (net->flight_size >= net->cwnd) {
 7076                                 /* skip this network, no room */
 7077                                 cwnd_full_ind++;
 7078                                 continue;
 7079                         }
 7080                         /*
 7081                          * JRI : this for loop we are in takes in each net,
 7082                          * if its's got space in cwnd and has data sent to
 7083                          * it (when CMT is off) then it calls
 7084                          * sctp_fill_outqueue for the net. This gets data on
 7085                          * the send queue for that network.
 7086                          * 
 7087                          * In sctp_fill_outqueue TSN's are assigned and data is
 7088                          * copied out of the stream buffers. Note mostly
 7089                          * copy by reference (we hope).
 7090                          */
 7091                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 7092                                 sctp_log_cwnd(stcb, net, 0, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7093                         }
 7094                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now);
 7095                         if (quit_now) {
 7096                                 /* memory alloc failure */
 7097                                 no_data_chunks = 1;
 7098                                 goto skip_the_fill_from_streams;
 7099                         }
 7100                 }
 7101                 if (start_at != TAILQ_FIRST(&asoc->nets)) {
 7102                         /* got to pick up the beginning stuff. */
 7103                         old_startat = start_at;
 7104                         start_at = net = TAILQ_FIRST(&asoc->nets);
 7105                         if (old_startat)
 7106                                 goto one_more_time;
 7107                 }
 7108         }
 7109 skip_the_fill_from_streams:
 7110         *cwnd_full = cwnd_full_ind;
 7111 
 7112         /* now service each destination and send out what we can for it */
 7113         /* Nothing to send? */
 7114         if ((TAILQ_FIRST(&asoc->control_send_queue) == NULL) &&
 7115             (TAILQ_FIRST(&asoc->send_queue) == NULL)) {
 7116                 *reason_code = 8;
 7117                 return (0);
 7118         }
 7119         if (no_data_chunks) {
 7120                 chk = TAILQ_FIRST(&asoc->control_send_queue);
 7121         } else {
 7122                 chk = TAILQ_FIRST(&asoc->send_queue);
 7123         }
 7124         if (chk) {
 7125                 send_start_at = chk->whoTo;
 7126         } else {
 7127                 send_start_at = TAILQ_FIRST(&asoc->nets);
 7128         }
 7129         old_startat = NULL;
 7130 again_one_more_time:
 7131         for (net = send_start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 7132                 /* how much can we send? */
 7133                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 7134                 if (old_startat && (old_startat == net)) {
 7135                         /* through list ocmpletely. */
 7136                         break;
 7137                 }
 7138                 tsns_sent = 0;
 7139                 if (net->ref_count < 2) {
 7140                         /*
 7141                          * Ref-count of 1 so we cannot have data or control
 7142                          * queued to this address. Skip it.
 7143                          */
 7144                         continue;
 7145                 }
 7146                 ctl_cnt = bundle_at = 0;
 7147                 endoutchain = outchain = NULL;
 7148                 no_fragmentflg = 1;
 7149                 one_chunk = 0;
 7150                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 7151                         skip_data_for_this_net = 1;
 7152                 } else {
 7153                         skip_data_for_this_net = 0;
 7154                 }
 7155                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
 7156                         /*
 7157                          * if we have a route and an ifp check to see if we
 7158                          * have room to send to this guy
 7159                          */
 7160                         struct ifnet *ifp;
 7161 
 7162                         ifp = net->ro.ro_rt->rt_ifp;
 7163                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
 7164                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
 7165                                 if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
 7166                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
 7167                                 }
 7168                                 continue;
 7169                         }
 7170                 }
 7171                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
 7172                         mtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
 7173                 } else {
 7174                         mtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
 7175                 }
 7176                 mx_mtu = mtu;
 7177                 to_out = 0;
 7178                 if (mtu > asoc->peers_rwnd) {
 7179                         if (asoc->total_flight > 0) {
 7180                                 /* We have a packet in flight somewhere */
 7181                                 r_mtu = asoc->peers_rwnd;
 7182                         } else {
 7183                                 /* We are always allowed to send one MTU out */
 7184                                 one_chunk = 1;
 7185                                 r_mtu = mtu;
 7186                         }
 7187                 } else {
 7188                         r_mtu = mtu;
 7189                 }
 7190                 /************************/
 7191                 /* Control transmission */
 7192                 /************************/
 7193                 /* Now first lets go through the control queue */
 7194                 for (chk = TAILQ_FIRST(&asoc->control_send_queue);
 7195                     chk; chk = nchk) {
 7196                         nchk = TAILQ_NEXT(chk, sctp_next);
 7197                         if (chk->whoTo != net) {
 7198                                 /*
 7199                                  * No, not sent to the network we are
 7200                                  * looking at
 7201                                  */
 7202                                 continue;
 7203                         }
 7204                         if (chk->data == NULL) {
 7205                                 continue;
 7206                         }
 7207                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 7208                                 /*
 7209                                  * It must be unsent. Cookies and ASCONF's
 7210                                  * hang around but there timers will force
 7211                                  * when marked for resend.
 7212                                  */
 7213                                 continue;
 7214                         }
 7215                         /*
 7216                          * if no AUTH is yet included and this chunk
 7217                          * requires it, make sure to account for it.  We
 7218                          * don't apply the size until the AUTH chunk is
 7219                          * actually added below in case there is no room for
 7220                          * this chunk. NOTE: we overload the use of "omtu"
 7221                          * here
 7222                          */
 7223                         if ((auth == NULL) &&
 7224                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 7225                             stcb->asoc.peer_auth_chunks)) {
 7226                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 7227                         } else
 7228                                 omtu = 0;
 7229                         /* Here we do NOT factor the r_mtu */
 7230                         if ((chk->send_size < (int)(mtu - omtu)) ||
 7231                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 7232                                 /*
 7233                                  * We probably should glom the mbuf chain
 7234                                  * from the chk->data for control but the
 7235                                  * problem is it becomes yet one more level
 7236                                  * of tracking to do if for some reason
 7237                                  * output fails. Then I have got to
 7238                                  * reconstruct the merged control chain.. el
 7239                                  * yucko.. for now we take the easy way and
 7240                                  * do the copy
 7241                                  */
 7242                                 /*
 7243                                  * Add an AUTH chunk, if chunk requires it
 7244                                  * save the offset into the chain for AUTH
 7245                                  */
 7246                                 if ((auth == NULL) &&
 7247                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 7248                                     stcb->asoc.peer_auth_chunks))) {
 7249                                         outchain = sctp_add_auth_chunk(outchain,
 7250                                             &endoutchain,
 7251                                             &auth,
 7252                                             &auth_offset,
 7253                                             stcb,
 7254                                             chk->rec.chunk_id.id);
 7255                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 7256                                 }
 7257                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 7258                                     (int)chk->rec.chunk_id.can_take_data,
 7259                                     chk->send_size, chk->copy_by_ref);
 7260                                 if (outchain == NULL) {
 7261                                         *reason_code = 8;
 7262                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 7263                                         return (ENOMEM);
 7264                                 }
 7265                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 7266                                 /* update our MTU size */
 7267                                 if (mtu > (chk->send_size + omtu))
 7268                                         mtu -= (chk->send_size + omtu);
 7269                                 else
 7270                                         mtu = 0;
 7271                                 to_out += (chk->send_size + omtu);
 7272                                 /* Do clear IP_DF ? */
 7273                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 7274                                         no_fragmentflg = 0;
 7275                                 }
 7276                                 if (chk->rec.chunk_id.can_take_data)
 7277                                         chk->data = NULL;
 7278                                 /* Mark things to be removed, if needed */
 7279                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7280                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 7281                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 7282                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 7283                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 7284                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 7285                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 7286                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 7287                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 7288                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 7289 
 7290                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 7291                                                 hbflag = 1;
 7292                                                 /*
 7293                                                  * JRS 5/14/07 - Set the
 7294                                                  * flag to say a heartbeat
 7295                                                  * is being sent.
 7296                                                  */
 7297                                                 pf_hbflag = 1;
 7298                                         }
 7299                                         /* remove these chunks at the end */
 7300                                         if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
 7301                                                 /* turn off the timer */
 7302                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 7303                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 7304                                                             inp, stcb, net, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 7305                                                 }
 7306                                         }
 7307                                         ctl_cnt++;
 7308                                 } else {
 7309                                         /*
 7310                                          * Other chunks, since they have
 7311                                          * timers running (i.e. COOKIE or
 7312                                          * ASCONF) we just "trust" that it
 7313                                          * gets sent or retransmitted.
 7314                                          */
 7315                                         ctl_cnt++;
 7316                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 7317                                                 cookie = 1;
 7318                                                 no_out_cnt = 1;
 7319                                         } else if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 7320                                                 /*
 7321                                                  * set hb flag since we can
 7322                                                  * use these for RTO
 7323                                                  */
 7324                                                 hbflag = 1;
 7325                                                 asconf = 1;
 7326                                                 /*
 7327                                                  * should sysctl this: don't
 7328                                                  * bundle data with ASCONF
 7329                                                  * since it requires AUTH
 7330                                                  */
 7331                                                 no_data_chunks = 1;
 7332                                         }
 7333                                         chk->sent = SCTP_DATAGRAM_SENT;
 7334                                         chk->snd_count++;
 7335                                 }
 7336                                 if (mtu == 0) {
 7337                                         /*
 7338                                          * Ok we are out of room but we can
 7339                                          * output without effecting the
 7340                                          * flight size since this little guy
 7341                                          * is a control only packet.
 7342                                          */
 7343                                         if (asconf) {
 7344                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 7345                                                 /*
 7346                                                  * do NOT clear the asconf
 7347                                                  * flag as it is used to do
 7348                                                  * appropriate source
 7349                                                  * address selection.
 7350                                                  */
 7351                                         }
 7352                                         if (cookie) {
 7353                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 7354                                                 cookie = 0;
 7355                                         }
 7356                                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
 7357                                         if (outchain == NULL) {
 7358                                                 /* no memory */
 7359                                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 7360                                                 error = ENOBUFS;
 7361                                                 goto error_out_again;
 7362                                         }
 7363                                         shdr = mtod(outchain, struct sctphdr *);
 7364                                         shdr->src_port = inp->sctp_lport;
 7365                                         shdr->dest_port = stcb->rport;
 7366                                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 7367                                         shdr->checksum = 0;
 7368                                         auth_offset += sizeof(struct sctphdr);
 7369                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 7370                                             (struct sockaddr *)&net->ro._l_addr,
 7371                                             outchain, auth_offset, auth,
 7372                                             no_fragmentflg, 0, NULL, asconf, so_locked))) {
 7373                                                 if (error == ENOBUFS) {
 7374                                                         asoc->ifp_had_enobuf = 1;
 7375                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 7376                                                 }
 7377                                                 if (from_where == 0) {
 7378                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 7379                                                 }
 7380                                 error_out_again:
 7381                                                 /* error, could not output */
 7382                                                 if (hbflag) {
 7383                                                         if (*now_filled == 0) {
 7384                                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 7385                                                                 *now_filled = 1;
 7386                                                                 *now = net->last_sent_time;
 7387                                                         } else {
 7388                                                                 net->last_sent_time = *now;
 7389                                                         }
 7390                                                         hbflag = 0;
 7391                                                 }
 7392                                                 if (error == EHOSTUNREACH) {
 7393                                                         /*
 7394                                                          * Destination went
 7395                                                          * unreachable
 7396                                                          * during this send
 7397                                                          */
 7398                                                         sctp_move_to_an_alt(stcb, asoc, net);
 7399                                                 }
 7400                                                 *reason_code = 7;
 7401                                                 continue;
 7402                                         } else
 7403                                                 asoc->ifp_had_enobuf = 0;
 7404                                         /* Only HB or ASCONF advances time */
 7405                                         if (hbflag) {
 7406                                                 if (*now_filled == 0) {
 7407                                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 7408                                                         *now_filled = 1;
 7409                                                         *now = net->last_sent_time;
 7410                                                 } else {
 7411                                                         net->last_sent_time = *now;
 7412                                                 }
 7413                                                 hbflag = 0;
 7414                                         }
 7415                                         /*
 7416                                          * increase the number we sent, if a
 7417                                          * cookie is sent we don't tell them
 7418                                          * any was sent out.
 7419                                          */
 7420                                         outchain = endoutchain = NULL;
 7421                                         auth = NULL;
 7422                                         auth_offset = 0;
 7423                                         if (!no_out_cnt)
 7424                                                 *num_out += ctl_cnt;
 7425                                         /* recalc a clean slate and setup */
 7426                                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 7427                                                 mtu = (net->mtu - SCTP_MIN_OVERHEAD);
 7428                                         } else {
 7429                                                 mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
 7430                                         }
 7431                                         to_out = 0;
 7432                                         no_fragmentflg = 1;
 7433                                 }
 7434                         }
 7435                 }
 7436                 /*********************/
 7437                 /* Data transmission */
 7438                 /*********************/
 7439                 /*
 7440                  * if AUTH for DATA is required and no AUTH has been added
 7441                  * yet, account for this in the mtu now... if no data can be
 7442                  * bundled, this adjustment won't matter anyways since the
 7443                  * packet will be going out...
 7444                  */
 7445                 if ((auth == NULL) &&
 7446                     sctp_auth_is_required_chunk(SCTP_DATA,
 7447                     stcb->asoc.peer_auth_chunks)) {
 7448                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 7449                 }
 7450                 /* now lets add any data within the MTU constraints */
 7451                 if (((struct sockaddr *)&net->ro._l_addr)->sa_family == AF_INET) {
 7452                         if (net->mtu > (sizeof(struct ip) + sizeof(struct sctphdr)))
 7453                                 omtu = net->mtu - (sizeof(struct ip) + sizeof(struct sctphdr));
 7454                         else
 7455                                 omtu = 0;
 7456                 } else {
 7457                         if (net->mtu > (sizeof(struct ip6_hdr) + sizeof(struct sctphdr)))
 7458                                 omtu = net->mtu - (sizeof(struct ip6_hdr) + sizeof(struct sctphdr));
 7459                         else
 7460                                 omtu = 0;
 7461                 }
 7462                 if ((((asoc->state & SCTP_STATE_OPEN) == SCTP_STATE_OPEN) && (skip_data_for_this_net == 0)) ||
 7463                     (cookie)) {
 7464                         for (chk = TAILQ_FIRST(&asoc->send_queue); chk; chk = nchk) {
 7465                                 if (no_data_chunks) {
 7466                                         /* let only control go out */
 7467                                         *reason_code = 1;
 7468                                         break;
 7469                                 }
 7470                                 if (net->flight_size >= net->cwnd) {
 7471                                         /* skip this net, no room for data */
 7472                                         *reason_code = 2;
 7473                                         break;
 7474                                 }
 7475                                 nchk = TAILQ_NEXT(chk, sctp_next);
 7476                                 if (chk->whoTo != net) {
 7477                                         /* No, not sent to this net */
 7478                                         continue;
 7479                                 }
 7480                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 7481                                         /*-
 7482                                          * strange, we have a chunk that is
 7483                                          * to big for its destination and
 7484                                          * yet no fragment ok flag.
 7485                                          * Something went wrong when the
 7486                                          * PMTU changed...we did not mark
 7487                                          * this chunk for some reason?? I
 7488                                          * will fix it here by letting IP
 7489                                          * fragment it for now and printing
 7490                                          * a warning. This really should not
 7491                                          * happen ...
 7492                                          */
 7493                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 7494                                             chk->send_size, mtu);
 7495                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 7496                                 }
 7497                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 7498                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 7499                                         /* ok we will add this one */
 7500 
 7501                                         /*
 7502                                          * Add an AUTH chunk, if chunk
 7503                                          * requires it, save the offset into
 7504                                          * the chain for AUTH
 7505                                          */
 7506                                         if ((auth == NULL) &&
 7507                                             (sctp_auth_is_required_chunk(SCTP_DATA,
 7508                                             stcb->asoc.peer_auth_chunks))) {
 7509 
 7510                                                 outchain = sctp_add_auth_chunk(outchain,
 7511                                                     &endoutchain,
 7512                                                     &auth,
 7513                                                     &auth_offset,
 7514                                                     stcb,
 7515                                                     SCTP_DATA);
 7516                                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 7517                                         }
 7518                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 7519                                             chk->send_size, chk->copy_by_ref);
 7520                                         if (outchain == NULL) {
 7521                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 7522                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 7523                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 7524                                                 }
 7525                                                 *reason_code = 3;
 7526                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 7527                                                 return (ENOMEM);
 7528                                         }
 7529                                         /* upate our MTU size */
 7530                                         /* Do clear IP_DF ? */
 7531                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 7532                                                 no_fragmentflg = 0;
 7533                                         }
 7534                                         /* unsigned subtraction of mtu */
 7535                                         if (mtu > chk->send_size)
 7536                                                 mtu -= chk->send_size;
 7537                                         else
 7538                                                 mtu = 0;
 7539                                         /* unsigned subtraction of r_mtu */
 7540                                         if (r_mtu > chk->send_size)
 7541                                                 r_mtu -= chk->send_size;
 7542                                         else
 7543                                                 r_mtu = 0;
 7544 
 7545                                         to_out += chk->send_size;
 7546                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 7547 #ifdef INVARIANTS
 7548                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
 7549 #else
 7550                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
 7551                                                     mx_mtu, to_out);
 7552 #endif
 7553                                         }
 7554                                         chk->window_probe = 0;
 7555                                         data_list[bundle_at++] = chk;
 7556                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 7557                                                 mtu = 0;
 7558                                                 break;
 7559                                         }
 7560                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
 7561                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 7562                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
 7563                                                 } else {
 7564                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
 7565                                                 }
 7566                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
 7567                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
 7568                                                         /*
 7569                                                          * Count number of
 7570                                                          * user msg's that
 7571                                                          * were fragmented
 7572                                                          * we do this by
 7573                                                          * counting when we
 7574                                                          * see a LAST
 7575                                                          * fragment only.
 7576                                                          */
 7577                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
 7578                                         }
 7579                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
 7580                                                 if (one_chunk) {
 7581                                                         data_list[0]->window_probe = 1;
 7582                                                         net->window_probe = 1;
 7583                                                 }
 7584                                                 break;
 7585                                         }
 7586                                 } else {
 7587                                         /*
 7588                                          * Must be sent in order of the
 7589                                          * TSN's (on a network)
 7590                                          */
 7591                                         break;
 7592                                 }
 7593                         }       /* for (chunk gather loop for this net) */
 7594                 }               /* if asoc.state OPEN */
 7595                 /* Is there something to send for this destination? */
 7596                 if (outchain) {
 7597                         /* We may need to start a control timer or two */
 7598                         if (asconf) {
 7599                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
 7600                                     stcb, net);
 7601                                 /*
 7602                                  * do NOT clear the asconf flag as it is
 7603                                  * used to do appropriate source address
 7604                                  * selection.
 7605                                  */
 7606                         }
 7607                         if (cookie) {
 7608                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 7609                                 cookie = 0;
 7610                         }
 7611                         /* must start a send timer if data is being sent */
 7612                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 7613                                 /*
 7614                                  * no timer running on this destination
 7615                                  * restart it.
 7616                                  */
 7617                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 7618                         } else if (sctp_cmt_on_off && sctp_cmt_pf && pf_hbflag && ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)
 7619                             && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 7620                                 /*
 7621                                  * JRS 5/14/07 - If a HB has been sent to a
 7622                                  * PF destination and no T3 timer is
 7623                                  * currently running, start the T3 timer to
 7624                                  * track the HBs that were sent.
 7625                                  */
 7626                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 7627                         }
 7628                         /* Now send it, if there is anything to send :> */
 7629                         SCTP_BUF_PREPEND(outchain, sizeof(struct sctphdr), M_DONTWAIT);
 7630                         if (outchain == NULL) {
 7631                                 /* out of mbufs */
 7632                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 7633                                 error = ENOBUFS;
 7634                                 goto errored_send;
 7635                         }
 7636                         shdr = mtod(outchain, struct sctphdr *);
 7637                         shdr->src_port = inp->sctp_lport;
 7638                         shdr->dest_port = stcb->rport;
 7639                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 7640                         shdr->checksum = 0;
 7641                         auth_offset += sizeof(struct sctphdr);
 7642                         if ((error = sctp_lowlevel_chunk_output(inp,
 7643                             stcb,
 7644                             net,
 7645                             (struct sockaddr *)&net->ro._l_addr,
 7646                             outchain,
 7647                             auth_offset,
 7648                             auth,
 7649                             no_fragmentflg,
 7650                             bundle_at,
 7651                             data_list[0],
 7652                             asconf, so_locked))) {
 7653                                 /* error, we could not output */
 7654                                 if (error == ENOBUFS) {
 7655                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 7656                                         asoc->ifp_had_enobuf = 1;
 7657                                 }
 7658                                 if (from_where == 0) {
 7659                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 7660                                 }
 7661                 errored_send:
 7662                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 7663                                 if (hbflag) {
 7664                                         if (*now_filled == 0) {
 7665                                                 (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 7666                                                 *now_filled = 1;
 7667                                                 *now = net->last_sent_time;
 7668                                         } else {
 7669                                                 net->last_sent_time = *now;
 7670                                         }
 7671                                         hbflag = 0;
 7672                                 }
 7673                                 if (error == EHOSTUNREACH) {
 7674                                         /*
 7675                                          * Destination went unreachable
 7676                                          * during this send
 7677                                          */
 7678                                         sctp_move_to_an_alt(stcb, asoc, net);
 7679                                 }
 7680                                 *reason_code = 6;
 7681                                 /*-
 7682                                  * I add this line to be paranoid. As far as
 7683                                  * I can tell the continue, takes us back to
 7684                                  * the top of the for, but just to make sure
 7685                                  * I will reset these again here.
 7686                                  */
 7687                                 ctl_cnt = bundle_at = 0;
 7688                                 continue;       /* This takes us back to the
 7689                                                  * for() for the nets. */
 7690                         } else {
 7691                                 asoc->ifp_had_enobuf = 0;
 7692                         }
 7693                         outchain = endoutchain = NULL;
 7694                         auth = NULL;
 7695                         auth_offset = 0;
 7696                         if (bundle_at || hbflag) {
 7697                                 /* For data/asconf and hb set time */
 7698                                 if (*now_filled == 0) {
 7699                                         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 7700                                         *now_filled = 1;
 7701                                         *now = net->last_sent_time;
 7702                                 } else {
 7703                                         net->last_sent_time = *now;
 7704                                 }
 7705                         }
 7706                         if (!no_out_cnt) {
 7707                                 *num_out += (ctl_cnt + bundle_at);
 7708                         }
 7709                         if (bundle_at) {
 7710                                 /* setup for a RTO measurement */
 7711                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
 7712                                 /* fill time if not already filled */
 7713                                 if (*now_filled == 0) {
 7714                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 7715                                         *now_filled = 1;
 7716                                         *now = asoc->time_last_sent;
 7717                                 } else {
 7718                                         asoc->time_last_sent = *now;
 7719                                 }
 7720                                 data_list[0]->do_rtt = 1;
 7721                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
 7722                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
 7723                                 if (sctp_early_fr) {
 7724                                         if (net->flight_size < net->cwnd) {
 7725                                                 /* start or restart it */
 7726                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 7727                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
 7728                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
 7729                                                 }
 7730                                                 SCTP_STAT_INCR(sctps_earlyfrstrout);
 7731                                                 sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net);
 7732                                         } else {
 7733                                                 /* stop it if its running */
 7734                                                 if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) {
 7735                                                         SCTP_STAT_INCR(sctps_earlyfrstpout);
 7736                                                         sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, inp, stcb, net,
 7737                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
 7738                                                 }
 7739                                         }
 7740                                 }
 7741                         }
 7742                         if (one_chunk) {
 7743                                 break;
 7744                         }
 7745                 }
 7746                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 7747                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
 7748                 }
 7749         }
 7750         if (old_startat == NULL) {
 7751                 old_startat = send_start_at;
 7752                 send_start_at = TAILQ_FIRST(&asoc->nets);
 7753                 if (old_startat)
 7754                         goto again_one_more_time;
 7755         }
 7756         /*
 7757          * At the end there should be no NON timed chunks hanging on this
 7758          * queue.
 7759          */
 7760         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 7761                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
 7762         }
 7763         if ((*num_out == 0) && (*reason_code == 0)) {
 7764                 *reason_code = 4;
 7765         } else {
 7766                 *reason_code = 5;
 7767         }
 7768         sctp_clean_up_ctl(stcb, asoc);
 7769         return (0);
 7770 }
 7771 
 7772 void
 7773 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
 7774 {
 7775         /*-
 7776          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 7777          * the control chunk queue.
 7778          */
 7779         struct sctp_chunkhdr *hdr;
 7780         struct sctp_tmit_chunk *chk;
 7781         struct mbuf *mat;
 7782 
 7783         SCTP_TCB_LOCK_ASSERT(stcb);
 7784         sctp_alloc_a_chunk(stcb, chk);
 7785         if (chk == NULL) {
 7786                 /* no memory */
 7787                 sctp_m_freem(op_err);
 7788                 return;
 7789         }
 7790         chk->copy_by_ref = 0;
 7791         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_DONTWAIT);
 7792         if (op_err == NULL) {
 7793                 sctp_free_a_chunk(stcb, chk);
 7794                 return;
 7795         }
 7796         chk->send_size = 0;
 7797         mat = op_err;
 7798         while (mat != NULL) {
 7799                 chk->send_size += SCTP_BUF_LEN(mat);
 7800                 mat = SCTP_BUF_NEXT(mat);
 7801         }
 7802         chk->rec.chunk_id.id = SCTP_OPERATION_ERROR;
 7803         chk->rec.chunk_id.can_take_data = 1;
 7804         chk->sent = SCTP_DATAGRAM_UNSENT;
 7805         chk->snd_count = 0;
 7806         chk->flags = 0;
 7807         chk->asoc = &stcb->asoc;
 7808         chk->data = op_err;
 7809         chk->whoTo = chk->asoc->primary_destination;
 7810         atomic_add_int(&chk->whoTo->ref_count, 1);
 7811         hdr = mtod(op_err, struct sctp_chunkhdr *);
 7812         hdr->chunk_type = SCTP_OPERATION_ERROR;
 7813         hdr->chunk_flags = 0;
 7814         hdr->chunk_length = htons(chk->send_size);
 7815         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue,
 7816             chk,
 7817             sctp_next);
 7818         chk->asoc->ctrl_queue_cnt++;
 7819 }
 7820 
 7821 int
 7822 sctp_send_cookie_echo(struct mbuf *m,
 7823     int offset,
 7824     struct sctp_tcb *stcb,
 7825     struct sctp_nets *net)
 7826 {
 7827         /*-
 7828          * pull out the cookie and put it at the front of the control chunk
 7829          * queue.
 7830          */
 7831         int at;
 7832         struct mbuf *cookie;
 7833         struct sctp_paramhdr parm, *phdr;
 7834         struct sctp_chunkhdr *hdr;
 7835         struct sctp_tmit_chunk *chk;
 7836         uint16_t ptype, plen;
 7837 
 7838         /* First find the cookie in the param area */
 7839         cookie = NULL;
 7840         at = offset + sizeof(struct sctp_init_chunk);
 7841 
 7842         SCTP_TCB_LOCK_ASSERT(stcb);
 7843         do {
 7844                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
 7845                 if (phdr == NULL) {
 7846                         return (-3);
 7847                 }
 7848                 ptype = ntohs(phdr->param_type);
 7849                 plen = ntohs(phdr->param_length);
 7850                 if (ptype == SCTP_STATE_COOKIE) {
 7851                         int pad;
 7852 
 7853                         /* found the cookie */
 7854                         if ((pad = (plen % 4))) {
 7855                                 plen += 4 - pad;
 7856                         }
 7857                         cookie = SCTP_M_COPYM(m, at, plen, M_DONTWAIT);
 7858                         if (cookie == NULL) {
 7859                                 /* No memory */
 7860                                 return (-2);
 7861                         }
 7862                         break;
 7863                 }
 7864                 at += SCTP_SIZE32(plen);
 7865         } while (phdr);
 7866         if (cookie == NULL) {
 7867                 /* Did not find the cookie */
 7868                 return (-3);
 7869         }
 7870         /* ok, we got the cookie lets change it into a cookie echo chunk */
 7871 
 7872         /* first the change from param to cookie */
 7873         hdr = mtod(cookie, struct sctp_chunkhdr *);
 7874         hdr->chunk_type = SCTP_COOKIE_ECHO;
 7875         hdr->chunk_flags = 0;
 7876         /* get the chunk stuff now and place it in the FRONT of the queue */
 7877         sctp_alloc_a_chunk(stcb, chk);
 7878         if (chk == NULL) {
 7879                 /* no memory */
 7880                 sctp_m_freem(cookie);
 7881                 return (-5);
 7882         }
 7883         chk->copy_by_ref = 0;
 7884         chk->send_size = plen;
 7885         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
 7886         chk->rec.chunk_id.can_take_data = 0;
 7887         chk->sent = SCTP_DATAGRAM_UNSENT;
 7888         chk->snd_count = 0;
 7889         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 7890         chk->asoc = &stcb->asoc;
 7891         chk->data = cookie;
 7892         chk->whoTo = chk->asoc->primary_destination;
 7893         atomic_add_int(&chk->whoTo->ref_count, 1);
 7894         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
 7895         chk->asoc->ctrl_queue_cnt++;
 7896         return (0);
 7897 }
 7898 
 7899 void
 7900 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
 7901     struct mbuf *m,
 7902     int offset,
 7903     int chk_length,
 7904     struct sctp_nets *net)
 7905 {
 7906         /*
 7907          * take a HB request and make it into a HB ack and send it.
 7908          */
 7909         struct mbuf *outchain;
 7910         struct sctp_chunkhdr *chdr;
 7911         struct sctp_tmit_chunk *chk;
 7912 
 7913 
 7914         if (net == NULL)
 7915                 /* must have a net pointer */
 7916                 return;
 7917 
 7918         outchain = SCTP_M_COPYM(m, offset, chk_length, M_DONTWAIT);
 7919         if (outchain == NULL) {
 7920                 /* gak out of memory */
 7921                 return;
 7922         }
 7923         chdr = mtod(outchain, struct sctp_chunkhdr *);
 7924         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
 7925         chdr->chunk_flags = 0;
 7926         if (chk_length % 4) {
 7927                 /* need pad */
 7928                 uint32_t cpthis = 0;
 7929                 int padlen;
 7930 
 7931                 padlen = 4 - (chk_length % 4);
 7932                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
 7933         }
 7934         sctp_alloc_a_chunk(stcb, chk);
 7935         if (chk == NULL) {
 7936                 /* no memory */
 7937                 sctp_m_freem(outchain);
 7938                 return;
 7939         }
 7940         chk->copy_by_ref = 0;
 7941         chk->send_size = chk_length;
 7942         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
 7943         chk->rec.chunk_id.can_take_data = 1;
 7944         chk->sent = SCTP_DATAGRAM_UNSENT;
 7945         chk->snd_count = 0;
 7946         chk->flags = 0;
 7947         chk->asoc = &stcb->asoc;
 7948         chk->data = outchain;
 7949         chk->whoTo = net;
 7950         atomic_add_int(&chk->whoTo->ref_count, 1);
 7951         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 7952         chk->asoc->ctrl_queue_cnt++;
 7953 }
 7954 
 7955 void
 7956 sctp_send_cookie_ack(struct sctp_tcb *stcb)
 7957 {
 7958         /* formulate and queue a cookie-ack back to sender */
 7959         struct mbuf *cookie_ack;
 7960         struct sctp_chunkhdr *hdr;
 7961         struct sctp_tmit_chunk *chk;
 7962 
 7963         cookie_ack = NULL;
 7964         SCTP_TCB_LOCK_ASSERT(stcb);
 7965 
 7966         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_DONTWAIT, 1, MT_HEADER);
 7967         if (cookie_ack == NULL) {
 7968                 /* no mbuf's */
 7969                 return;
 7970         }
 7971         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
 7972         sctp_alloc_a_chunk(stcb, chk);
 7973         if (chk == NULL) {
 7974                 /* no memory */
 7975                 sctp_m_freem(cookie_ack);
 7976                 return;
 7977         }
 7978         chk->copy_by_ref = 0;
 7979         chk->send_size = sizeof(struct sctp_chunkhdr);
 7980         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
 7981         chk->rec.chunk_id.can_take_data = 1;
 7982         chk->sent = SCTP_DATAGRAM_UNSENT;
 7983         chk->snd_count = 0;
 7984         chk->flags = 0;
 7985         chk->asoc = &stcb->asoc;
 7986         chk->data = cookie_ack;
 7987         if (chk->asoc->last_control_chunk_from != NULL) {
 7988                 chk->whoTo = chk->asoc->last_control_chunk_from;
 7989         } else {
 7990                 chk->whoTo = chk->asoc->primary_destination;
 7991         }
 7992         atomic_add_int(&chk->whoTo->ref_count, 1);
 7993         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
 7994         hdr->chunk_type = SCTP_COOKIE_ACK;
 7995         hdr->chunk_flags = 0;
 7996         hdr->chunk_length = htons(chk->send_size);
 7997         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
 7998         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 7999         chk->asoc->ctrl_queue_cnt++;
 8000         return;
 8001 }
 8002 
 8003 
 8004 void
 8005 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
 8006 {
 8007         /* formulate and queue a SHUTDOWN-ACK back to the sender */
 8008         struct mbuf *m_shutdown_ack;
 8009         struct sctp_shutdown_ack_chunk *ack_cp;
 8010         struct sctp_tmit_chunk *chk;
 8011 
 8012         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
 8013         if (m_shutdown_ack == NULL) {
 8014                 /* no mbuf's */
 8015                 return;
 8016         }
 8017         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
 8018         sctp_alloc_a_chunk(stcb, chk);
 8019         if (chk == NULL) {
 8020                 /* no memory */
 8021                 sctp_m_freem(m_shutdown_ack);
 8022                 return;
 8023         }
 8024         chk->copy_by_ref = 0;
 8025         chk->send_size = sizeof(struct sctp_chunkhdr);
 8026         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
 8027         chk->rec.chunk_id.can_take_data = 1;
 8028         chk->sent = SCTP_DATAGRAM_UNSENT;
 8029         chk->snd_count = 0;
 8030         chk->flags = 0;
 8031         chk->asoc = &stcb->asoc;
 8032         chk->data = m_shutdown_ack;
 8033         chk->whoTo = net;
 8034         atomic_add_int(&net->ref_count, 1);
 8035 
 8036         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
 8037         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
 8038         ack_cp->ch.chunk_flags = 0;
 8039         ack_cp->ch.chunk_length = htons(chk->send_size);
 8040         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
 8041         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8042         chk->asoc->ctrl_queue_cnt++;
 8043         return;
 8044 }
 8045 
 8046 void
 8047 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
 8048 {
 8049         /* formulate and queue a SHUTDOWN to the sender */
 8050         struct mbuf *m_shutdown;
 8051         struct sctp_shutdown_chunk *shutdown_cp;
 8052         struct sctp_tmit_chunk *chk;
 8053 
 8054         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
 8055         if (m_shutdown == NULL) {
 8056                 /* no mbuf's */
 8057                 return;
 8058         }
 8059         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
 8060         sctp_alloc_a_chunk(stcb, chk);
 8061         if (chk == NULL) {
 8062                 /* no memory */
 8063                 sctp_m_freem(m_shutdown);
 8064                 return;
 8065         }
 8066         chk->copy_by_ref = 0;
 8067         chk->send_size = sizeof(struct sctp_shutdown_chunk);
 8068         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
 8069         chk->rec.chunk_id.can_take_data = 1;
 8070         chk->sent = SCTP_DATAGRAM_UNSENT;
 8071         chk->snd_count = 0;
 8072         chk->flags = 0;
 8073         chk->asoc = &stcb->asoc;
 8074         chk->data = m_shutdown;
 8075         chk->whoTo = net;
 8076         atomic_add_int(&net->ref_count, 1);
 8077 
 8078         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
 8079         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
 8080         shutdown_cp->ch.chunk_flags = 0;
 8081         shutdown_cp->ch.chunk_length = htons(chk->send_size);
 8082         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 8083         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
 8084         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8085         chk->asoc->ctrl_queue_cnt++;
 8086         return;
 8087 }
 8088 
 8089 void
 8090 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
 8091 {
 8092         /*
 8093          * formulate and queue an ASCONF to the peer. ASCONF parameters
 8094          * should be queued on the assoc queue.
 8095          */
 8096         struct sctp_tmit_chunk *chk;
 8097         struct mbuf *m_asconf;
 8098         struct sctp_asconf_chunk *acp;
 8099         int len;
 8100 
 8101         SCTP_TCB_LOCK_ASSERT(stcb);
 8102         /* compose an ASCONF chunk, maximum length is PMTU */
 8103         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
 8104         if (m_asconf == NULL) {
 8105                 return;
 8106         }
 8107         acp = mtod(m_asconf, struct sctp_asconf_chunk *);
 8108         sctp_alloc_a_chunk(stcb, chk);
 8109         if (chk == NULL) {
 8110                 /* no memory */
 8111                 sctp_m_freem(m_asconf);
 8112                 return;
 8113         }
 8114         chk->copy_by_ref = 0;
 8115         chk->data = m_asconf;
 8116         chk->send_size = len;
 8117         chk->rec.chunk_id.id = SCTP_ASCONF;
 8118         chk->rec.chunk_id.can_take_data = 0;
 8119         chk->sent = SCTP_DATAGRAM_UNSENT;
 8120         chk->snd_count = 0;
 8121         chk->flags = 0;
 8122         chk->asoc = &stcb->asoc;
 8123         chk->whoTo = chk->asoc->primary_destination;
 8124         atomic_add_int(&chk->whoTo->ref_count, 1);
 8125         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8126         chk->asoc->ctrl_queue_cnt++;
 8127         return;
 8128 }
 8129 
 8130 void
 8131 sctp_send_asconf_ack(struct sctp_tcb *stcb)
 8132 {
 8133         /*
 8134          * formulate and queue a asconf-ack back to sender. the asconf-ack
 8135          * must be stored in the tcb.
 8136          */
 8137         struct sctp_tmit_chunk *chk;
 8138         struct sctp_asconf_ack *ack, *latest_ack;
 8139         struct mbuf *m_ack, *m;
 8140         struct sctp_nets *net = NULL;
 8141 
 8142         SCTP_TCB_LOCK_ASSERT(stcb);
 8143         /* Get the latest ASCONF-ACK */
 8144         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
 8145         if (latest_ack == NULL) {
 8146                 return;
 8147         }
 8148         if (latest_ack->last_sent_to != NULL &&
 8149             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
 8150                 /* we're doing a retransmission */
 8151                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
 8152                 if (net == NULL) {
 8153                         /* no alternate */
 8154                         if (stcb->asoc.last_control_chunk_from == NULL)
 8155                                 net = stcb->asoc.primary_destination;
 8156                         else
 8157                                 net = stcb->asoc.last_control_chunk_from;
 8158                 }
 8159         } else {
 8160                 /* normal case */
 8161                 if (stcb->asoc.last_control_chunk_from == NULL)
 8162                         net = stcb->asoc.primary_destination;
 8163                 else
 8164                         net = stcb->asoc.last_control_chunk_from;
 8165         }
 8166         latest_ack->last_sent_to = net;
 8167 
 8168         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
 8169                 if (ack->data == NULL) {
 8170                         continue;
 8171                 }
 8172                 /* copy the asconf_ack */
 8173                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_DONTWAIT);
 8174                 if (m_ack == NULL) {
 8175                         /* couldn't copy it */
 8176                         return;
 8177                 }
 8178                 sctp_alloc_a_chunk(stcb, chk);
 8179                 if (chk == NULL) {
 8180                         /* no memory */
 8181                         if (m_ack)
 8182                                 sctp_m_freem(m_ack);
 8183                         return;
 8184                 }
 8185                 chk->copy_by_ref = 0;
 8186 
 8187                 chk->whoTo = net;
 8188                 chk->data = m_ack;
 8189                 chk->send_size = 0;
 8190                 /* Get size */
 8191                 m = m_ack;
 8192                 chk->send_size = ack->len;
 8193                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
 8194                 chk->rec.chunk_id.can_take_data = 1;
 8195                 chk->sent = SCTP_DATAGRAM_UNSENT;
 8196                 chk->snd_count = 0;
 8197                 chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;  /* XXX */
 8198                 chk->asoc = &stcb->asoc;
 8199                 atomic_add_int(&chk->whoTo->ref_count, 1);
 8200 
 8201                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8202                 chk->asoc->ctrl_queue_cnt++;
 8203         }
 8204         return;
 8205 }
 8206 
 8207 
 8208 static int
 8209 sctp_chunk_retransmission(struct sctp_inpcb *inp,
 8210     struct sctp_tcb *stcb,
 8211     struct sctp_association *asoc,
 8212     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
 8213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 8214     SCTP_UNUSED
 8215 #endif
 8216 )
 8217 {
 8218         /*-
 8219          * send out one MTU of retransmission. If fast_retransmit is
 8220          * happening we ignore the cwnd. Otherwise we obey the cwnd and
 8221          * rwnd. For a Cookie or Asconf in the control chunk queue we
 8222          * retransmit them by themselves.
 8223          *
 8224          * For data chunks we will pick out the lowest TSN's in the sent_queue
 8225          * marked for resend and bundle them all together (up to a MTU of
 8226          * destination). The address to send to should have been
 8227          * selected/changed where the retransmission was marked (i.e. in FR
 8228          * or t3-timeout routines).
 8229          */
 8230         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 8231         struct sctp_tmit_chunk *chk, *fwd;
 8232         struct mbuf *m, *endofchain;
 8233         struct sctphdr *shdr;
 8234         int asconf;
 8235         struct sctp_nets *net = NULL;
 8236         uint32_t tsns_sent = 0;
 8237         int no_fragmentflg, bundle_at, cnt_thru;
 8238         unsigned int mtu;
 8239         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
 8240         struct sctp_auth_chunk *auth = NULL;
 8241         uint32_t auth_offset = 0;
 8242         uint32_t dmtu = 0;
 8243 
 8244         SCTP_TCB_LOCK_ASSERT(stcb);
 8245         tmr_started = ctl_cnt = bundle_at = error = 0;
 8246         no_fragmentflg = 1;
 8247         asconf = 0;
 8248         fwd_tsn = 0;
 8249         *cnt_out = 0;
 8250         fwd = NULL;
 8251         endofchain = m = NULL;
 8252 #ifdef SCTP_AUDITING_ENABLED
 8253         sctp_audit_log(0xC3, 1);
 8254 #endif
 8255         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
 8256             (TAILQ_EMPTY(&asoc->control_send_queue))) {
 8257                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
 8258                     asoc->sent_queue_retran_cnt);
 8259                 asoc->sent_queue_cnt = 0;
 8260                 asoc->sent_queue_cnt_removeable = 0;
 8261                 /* send back 0/0 so we enter normal transmission */
 8262                 *cnt_out = 0;
 8263                 return (0);
 8264         }
 8265         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 8266                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
 8267                     (chk->rec.chunk_id.id == SCTP_ASCONF) ||
 8268                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
 8269                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
 8270                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 8271                                 if (chk != asoc->str_reset) {
 8272                                         /*
 8273                                          * not eligible for retran if its
 8274                                          * not ours
 8275                                          */
 8276                                         continue;
 8277                                 }
 8278                         }
 8279                         ctl_cnt++;
 8280                         if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 8281                                 no_fragmentflg = 1;
 8282                                 asconf = 1;
 8283                         }
 8284                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 8285                                 fwd_tsn = 1;
 8286                                 fwd = chk;
 8287                         }
 8288                         /*
 8289                          * Add an AUTH chunk, if chunk requires it save the
 8290                          * offset into the chain for AUTH
 8291                          */
 8292                         if ((auth == NULL) &&
 8293                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8294                             stcb->asoc.peer_auth_chunks))) {
 8295                                 m = sctp_add_auth_chunk(m, &endofchain,
 8296                                     &auth, &auth_offset,
 8297                                     stcb,
 8298                                     chk->rec.chunk_id.id);
 8299                         }
 8300                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 8301                         break;
 8302                 }
 8303         }
 8304         one_chunk = 0;
 8305         cnt_thru = 0;
 8306         /* do we have control chunks to retransmit? */
 8307         if (m != NULL) {
 8308                 /* Start a timer no matter if we suceed or fail */
 8309                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8310                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
 8311                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
 8312                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
 8313 
 8314                 SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
 8315                 if (m == NULL) {
 8316                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 8317                         return (ENOBUFS);
 8318                 }
 8319                 shdr = mtod(m, struct sctphdr *);
 8320                 shdr->src_port = inp->sctp_lport;
 8321                 shdr->dest_port = stcb->rport;
 8322                 shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 8323                 shdr->checksum = 0;
 8324                 auth_offset += sizeof(struct sctphdr);
 8325                 chk->snd_count++;       /* update our count */
 8326 
 8327                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
 8328                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m, auth_offset,
 8329                     auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
 8330                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8331                         return (error);
 8332                 }
 8333                 m = endofchain = NULL;
 8334                 auth = NULL;
 8335                 auth_offset = 0;
 8336                 /*
 8337                  * We don't want to mark the net->sent time here since this
 8338                  * we use this for HB and retrans cannot measure RTT
 8339                  */
 8340                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
 8341                 *cnt_out += 1;
 8342                 chk->sent = SCTP_DATAGRAM_SENT;
 8343                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 8344                 if (fwd_tsn == 0) {
 8345                         return (0);
 8346                 } else {
 8347                         /* Clean up the fwd-tsn list */
 8348                         sctp_clean_up_ctl(stcb, asoc);
 8349                         return (0);
 8350                 }
 8351         }
 8352         /*
 8353          * Ok, it is just data retransmission we need to do or that and a
 8354          * fwd-tsn with it all.
 8355          */
 8356         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 8357                 return (SCTP_RETRAN_DONE);
 8358         }
 8359         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
 8360             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
 8361                 /* not yet open, resend the cookie and that is it */
 8362                 return (1);
 8363         }
 8364 #ifdef SCTP_AUDITING_ENABLED
 8365         sctp_auditing(20, inp, stcb, NULL);
 8366 #endif
 8367         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 8368                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 8369                         /* No, not sent to this net or not ready for rtx */
 8370                         continue;
 8371                 }
 8372                 if ((sctp_max_retran_chunk) && (chk->snd_count >= sctp_max_retran_chunk)) {
 8373                         /* Gak, we have exceeded max unlucky retran, abort! */
 8374                         SCTP_PRINTF("Gak, chk->snd_count:%d >= max:%d - send abort\n",
 8375                             chk->snd_count,
 8376                             sctp_max_retran_chunk);
 8377                         atomic_add_int(&stcb->asoc.refcnt, 1);
 8378                         sctp_abort_an_association(stcb->sctp_ep, stcb, 0, NULL, so_locked);
 8379                         SCTP_TCB_LOCK(stcb);
 8380                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 8381                         return (SCTP_RETRAN_EXIT);
 8382                 }
 8383                 /* pick up the net */
 8384                 net = chk->whoTo;
 8385                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 8386                         mtu = (net->mtu - SCTP_MIN_OVERHEAD);
 8387                 } else {
 8388                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8389                 }
 8390 
 8391                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
 8392                         /* No room in peers rwnd */
 8393                         uint32_t tsn;
 8394 
 8395                         tsn = asoc->last_acked_seq + 1;
 8396                         if (tsn == chk->rec.data.TSN_seq) {
 8397                                 /*
 8398                                  * we make a special exception for this
 8399                                  * case. The peer has no rwnd but is missing
 8400                                  * the lowest chunk.. which is probably what
 8401                                  * is holding up the rwnd.
 8402                                  */
 8403                                 goto one_chunk_around;
 8404                         }
 8405                         return (1);
 8406                 }
 8407 one_chunk_around:
 8408                 if (asoc->peers_rwnd < mtu) {
 8409                         one_chunk = 1;
 8410                         if ((asoc->peers_rwnd == 0) &&
 8411                             (asoc->total_flight == 0)) {
 8412                                 chk->window_probe = 1;
 8413                                 chk->whoTo->window_probe = 1;
 8414                         }
 8415                 }
 8416 #ifdef SCTP_AUDITING_ENABLED
 8417                 sctp_audit_log(0xC3, 2);
 8418 #endif
 8419                 bundle_at = 0;
 8420                 m = NULL;
 8421                 net->fast_retran_ip = 0;
 8422                 if (chk->rec.data.doing_fast_retransmit == 0) {
 8423                         /*
 8424                          * if no FR in progress skip destination that have
 8425                          * flight_size > cwnd.
 8426                          */
 8427                         if (net->flight_size >= net->cwnd) {
 8428                                 continue;
 8429                         }
 8430                 } else {
 8431                         /*
 8432                          * Mark the destination net to have FR recovery
 8433                          * limits put on it.
 8434                          */
 8435                         *fr_done = 1;
 8436                         net->fast_retran_ip = 1;
 8437                 }
 8438 
 8439                 /*
 8440                  * if no AUTH is yet included and this chunk requires it,
 8441                  * make sure to account for it.  We don't apply the size
 8442                  * until the AUTH chunk is actually added below in case
 8443                  * there is no room for this chunk.
 8444                  */
 8445                 if ((auth == NULL) &&
 8446                     sctp_auth_is_required_chunk(SCTP_DATA,
 8447                     stcb->asoc.peer_auth_chunks)) {
 8448                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8449                 } else
 8450                         dmtu = 0;
 8451 
 8452                 if ((chk->send_size <= (mtu - dmtu)) ||
 8453                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8454                         /* ok we will add this one */
 8455                         if ((auth == NULL) &&
 8456                             (sctp_auth_is_required_chunk(SCTP_DATA,
 8457                             stcb->asoc.peer_auth_chunks))) {
 8458                                 m = sctp_add_auth_chunk(m, &endofchain,
 8459                                     &auth, &auth_offset,
 8460                                     stcb, SCTP_DATA);
 8461                         }
 8462                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 8463                         if (m == NULL) {
 8464                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8465                                 return (ENOMEM);
 8466                         }
 8467                         /* Do clear IP_DF ? */
 8468                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8469                                 no_fragmentflg = 0;
 8470                         }
 8471                         /* upate our MTU size */
 8472                         if (mtu > (chk->send_size + dmtu))
 8473                                 mtu -= (chk->send_size + dmtu);
 8474                         else
 8475                                 mtu = 0;
 8476                         data_list[bundle_at++] = chk;
 8477                         if (one_chunk && (asoc->total_flight <= 0)) {
 8478                                 SCTP_STAT_INCR(sctps_windowprobed);
 8479                         }
 8480                 }
 8481                 if (one_chunk == 0) {
 8482                         /*
 8483                          * now are there anymore forward from chk to pick
 8484                          * up?
 8485                          */
 8486                         fwd = TAILQ_NEXT(chk, sctp_next);
 8487                         while (fwd) {
 8488                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
 8489                                         /* Nope, not for retran */
 8490                                         fwd = TAILQ_NEXT(fwd, sctp_next);
 8491                                         continue;
 8492                                 }
 8493                                 if (fwd->whoTo != net) {
 8494                                         /* Nope, not the net in question */
 8495                                         fwd = TAILQ_NEXT(fwd, sctp_next);
 8496                                         continue;
 8497                                 }
 8498                                 if ((auth == NULL) &&
 8499                                     sctp_auth_is_required_chunk(SCTP_DATA,
 8500                                     stcb->asoc.peer_auth_chunks)) {
 8501                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8502                                 } else
 8503                                         dmtu = 0;
 8504                                 if (fwd->send_size <= (mtu - dmtu)) {
 8505                                         if ((auth == NULL) &&
 8506                                             (sctp_auth_is_required_chunk(SCTP_DATA,
 8507                                             stcb->asoc.peer_auth_chunks))) {
 8508                                                 m = sctp_add_auth_chunk(m,
 8509                                                     &endofchain,
 8510                                                     &auth, &auth_offset,
 8511                                                     stcb,
 8512                                                     SCTP_DATA);
 8513                                         }
 8514                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
 8515                                         if (m == NULL) {
 8516                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8517                                                 return (ENOMEM);
 8518                                         }
 8519                                         /* Do clear IP_DF ? */
 8520                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8521                                                 no_fragmentflg = 0;
 8522                                         }
 8523                                         /* upate our MTU size */
 8524                                         if (mtu > (fwd->send_size + dmtu))
 8525                                                 mtu -= (fwd->send_size + dmtu);
 8526                                         else
 8527                                                 mtu = 0;
 8528                                         data_list[bundle_at++] = fwd;
 8529                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 8530                                                 break;
 8531                                         }
 8532                                         fwd = TAILQ_NEXT(fwd, sctp_next);
 8533                                 } else {
 8534                                         /* can't fit so we are done */
 8535                                         break;
 8536                                 }
 8537                         }
 8538                 }
 8539                 /* Is there something to send for this destination? */
 8540                 if (m) {
 8541                         /*
 8542                          * No matter if we fail/or suceed we should start a
 8543                          * timer. A failure is like a lost IP packet :-)
 8544                          */
 8545                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8546                                 /*
 8547                                  * no timer running on this destination
 8548                                  * restart it.
 8549                                  */
 8550                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8551                                 tmr_started = 1;
 8552                         }
 8553                         SCTP_BUF_PREPEND(m, sizeof(struct sctphdr), M_DONTWAIT);
 8554                         if (m == NULL) {
 8555                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
 8556                                 return (ENOBUFS);
 8557                         }
 8558                         shdr = mtod(m, struct sctphdr *);
 8559                         shdr->src_port = inp->sctp_lport;
 8560                         shdr->dest_port = stcb->rport;
 8561                         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 8562                         shdr->checksum = 0;
 8563                         auth_offset += sizeof(struct sctphdr);
 8564                         /* Now lets send it, if there is anything to send :> */
 8565                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8566                             (struct sockaddr *)&net->ro._l_addr, m, auth_offset,
 8567                             auth, no_fragmentflg, 0, NULL, asconf, so_locked))) {
 8568                                 /* error, we could not output */
 8569                                 SCTP_STAT_INCR(sctps_lowlevelerr);
 8570                                 return (error);
 8571                         }
 8572                         m = endofchain = NULL;
 8573                         auth = NULL;
 8574                         auth_offset = 0;
 8575                         /* For HB's */
 8576                         /*
 8577                          * We don't want to mark the net->sent time here
 8578                          * since this we use this for HB and retrans cannot
 8579                          * measure RTT
 8580                          */
 8581                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
 8582 
 8583                         /* For auto-close */
 8584                         cnt_thru++;
 8585                         if (*now_filled == 0) {
 8586                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 8587                                 *now = asoc->time_last_sent;
 8588                                 *now_filled = 1;
 8589                         } else {
 8590                                 asoc->time_last_sent = *now;
 8591                         }
 8592                         *cnt_out += bundle_at;
 8593 #ifdef SCTP_AUDITING_ENABLED
 8594                         sctp_audit_log(0xC4, bundle_at);
 8595 #endif
 8596                         if (bundle_at) {
 8597                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
 8598                         }
 8599                         for (i = 0; i < bundle_at; i++) {
 8600                                 SCTP_STAT_INCR(sctps_sendretransdata);
 8601                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 8602                                 /*
 8603                                  * When we have a revoked data, and we
 8604                                  * retransmit it, then we clear the revoked
 8605                                  * flag since this flag dictates if we
 8606                                  * subtracted from the fs
 8607                                  */
 8608                                 if (data_list[i]->rec.data.chunk_was_revoked) {
 8609                                         /* Deflate the cwnd */
 8610                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
 8611                                         data_list[i]->rec.data.chunk_was_revoked = 0;
 8612                                 }
 8613                                 data_list[i]->snd_count++;
 8614                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 8615                                 /* record the time */
 8616                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
 8617                                 if (data_list[i]->book_size_scale) {
 8618                                         /*
 8619                                          * need to double the book size on
 8620                                          * this one
 8621                                          */
 8622                                         data_list[i]->book_size_scale = 0;
 8623                                         /*
 8624                                          * Since we double the booksize, we
 8625                                          * must also double the output queue
 8626                                          * size, since this get shrunk when
 8627                                          * we free by this amount.
 8628                                          */
 8629                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
 8630                                         data_list[i]->book_size *= 2;
 8631 
 8632 
 8633                                 } else {
 8634                                         if (sctp_logging_level & SCTP_LOG_RWND_ENABLE) {
 8635                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 8636                                                     asoc->peers_rwnd, data_list[i]->send_size, sctp_peer_chunk_oh);
 8637                                         }
 8638                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 8639                                             (uint32_t) (data_list[i]->send_size +
 8640                                             sctp_peer_chunk_oh));
 8641                                 }
 8642                                 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) {
 8643                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
 8644                                             data_list[i]->whoTo->flight_size,
 8645                                             data_list[i]->book_size,
 8646                                             (uintptr_t) data_list[i]->whoTo,
 8647                                             data_list[i]->rec.data.TSN_seq);
 8648                                 }
 8649                                 sctp_flight_size_increase(data_list[i]);
 8650                                 sctp_total_flight_increase(stcb, data_list[i]);
 8651                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 8652                                         /* SWS sender side engages */
 8653                                         asoc->peers_rwnd = 0;
 8654                                 }
 8655                                 if ((i == 0) &&
 8656                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
 8657                                         SCTP_STAT_INCR(sctps_sendfastretrans);
 8658                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
 8659                                             (tmr_started == 0)) {
 8660                                                 /*-
 8661                                                  * ok we just fast-retrans'd
 8662                                                  * the lowest TSN, i.e the
 8663                                                  * first on the list. In
 8664                                                  * this case we want to give
 8665                                                  * some more time to get a
 8666                                                  * SACK back without a
 8667                                                  * t3-expiring.
 8668                                                  */
 8669                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
 8670                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
 8671                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8672                                         }
 8673                                 }
 8674                         }
 8675                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 8676                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
 8677                         }
 8678 #ifdef SCTP_AUDITING_ENABLED
 8679                         sctp_auditing(21, inp, stcb, NULL);
 8680 #endif
 8681                 } else {
 8682                         /* None will fit */
 8683                         return (1);
 8684                 }
 8685                 if (asoc->sent_queue_retran_cnt <= 0) {
 8686                         /* all done we have no more to retran */
 8687                         asoc->sent_queue_retran_cnt = 0;
 8688                         break;
 8689                 }
 8690                 if (one_chunk) {
 8691                         /* No more room in rwnd */
 8692                         return (1);
 8693                 }
 8694                 /* stop the for loop here. we sent out a packet */
 8695                 break;
 8696         }
 8697         return (0);
 8698 }
 8699 
 8700 
 8701 static int
 8702 sctp_timer_validation(struct sctp_inpcb *inp,
 8703     struct sctp_tcb *stcb,
 8704     struct sctp_association *asoc,
 8705     int ret)
 8706 {
 8707         struct sctp_nets *net;
 8708 
 8709         /* Validate that a timer is running somewhere */
 8710         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 8711                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8712                         /* Here is a timer */
 8713                         return (ret);
 8714                 }
 8715         }
 8716         SCTP_TCB_LOCK_ASSERT(stcb);
 8717         /* Gak, we did not have a timer somewhere */
 8718         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
 8719         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 8720         return (ret);
 8721 }
 8722 
 8723 void
 8724 sctp_chunk_output(struct sctp_inpcb *inp,
 8725     struct sctp_tcb *stcb,
 8726     int from_where,
 8727     int so_locked
 8728 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 8729     SCTP_UNUSED
 8730 #endif
 8731 )
 8732 {
 8733         /*-
 8734          * Ok this is the generic chunk service queue. we must do the
 8735          * following:
 8736          * - See if there are retransmits pending, if so we must
 8737          *   do these first.
 8738          * - Service the stream queue that is next, moving any
 8739          *   message (note I must get a complete message i.e.
 8740          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
 8741          *   TSN's
 8742          * - Check to see if the cwnd/rwnd allows any output, if so we
 8743          *   go ahead and fomulate and send the low level chunks. Making sure
 8744          *   to combine any control in the control chunk queue also.
 8745          */
 8746         struct sctp_association *asoc;
 8747         struct sctp_nets *net;
 8748         int error = 0, num_out = 0, tot_out = 0, ret = 0, reason_code = 0,
 8749             burst_cnt = 0, burst_limit = 0;
 8750         struct timeval now;
 8751         int now_filled = 0;
 8752         int cwnd_full = 0;
 8753         int nagle_on = 0;
 8754         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 8755         int un_sent = 0;
 8756         int fr_done, tot_frs = 0;
 8757 
 8758         asoc = &stcb->asoc;
 8759         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
 8760                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
 8761                         nagle_on = 0;
 8762                 } else {
 8763                         nagle_on = 1;
 8764                 }
 8765         }
 8766         SCTP_TCB_LOCK_ASSERT(stcb);
 8767 
 8768         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 8769 
 8770         if ((un_sent <= 0) &&
 8771             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
 8772             (asoc->sent_queue_retran_cnt == 0)) {
 8773                 /* Nothing to do unless there is something to be sent left */
 8774                 return;
 8775         }
 8776         /*
 8777          * Do we have something to send, data or control AND a sack timer
 8778          * running, if so piggy-back the sack.
 8779          */
 8780         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 8781                 sctp_send_sack(stcb);
 8782                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
 8783         }
 8784         while (asoc->sent_queue_retran_cnt) {
 8785                 /*-
 8786                  * Ok, it is retransmission time only, we send out only ONE
 8787                  * packet with a single call off to the retran code.
 8788                  */
 8789                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
 8790                         /*-
 8791                          * Special hook for handling cookiess discarded
 8792                          * by peer that carried data. Send cookie-ack only
 8793                          * and then the next call with get the retran's.
 8794                          */
 8795                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
 8796                             &cwnd_full, from_where,
 8797                             &now, &now_filled, frag_point, so_locked);
 8798                         return;
 8799                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
 8800                         /* if its not from a HB then do it */
 8801                         fr_done = 0;
 8802                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
 8803                         if (fr_done) {
 8804                                 tot_frs++;
 8805                         }
 8806                 } else {
 8807                         /*
 8808                          * its from any other place, we don't allow retran
 8809                          * output (only control)
 8810                          */
 8811                         ret = 1;
 8812                 }
 8813                 if (ret > 0) {
 8814                         /* Can't send anymore */
 8815                         /*-
 8816                          * now lets push out control by calling med-level
 8817                          * output once. this assures that we WILL send HB's
 8818                          * if queued too.
 8819                          */
 8820                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
 8821                             &cwnd_full, from_where,
 8822                             &now, &now_filled, frag_point, so_locked);
 8823 #ifdef SCTP_AUDITING_ENABLED
 8824                         sctp_auditing(8, inp, stcb, NULL);
 8825 #endif
 8826                         (void)sctp_timer_validation(inp, stcb, asoc, ret);
 8827                         return;
 8828                 }
 8829                 if (ret < 0) {
 8830                         /*-
 8831                          * The count was off.. retran is not happening so do
 8832                          * the normal retransmission.
 8833                          */
 8834 #ifdef SCTP_AUDITING_ENABLED
 8835                         sctp_auditing(9, inp, stcb, NULL);
 8836 #endif
 8837                         if (ret == SCTP_RETRAN_EXIT) {
 8838                                 return;
 8839                         }
 8840                         break;
 8841                 }
 8842                 if (from_where == SCTP_OUTPUT_FROM_T3) {
 8843                         /* Only one transmission allowed out of a timeout */
 8844 #ifdef SCTP_AUDITING_ENABLED
 8845                         sctp_auditing(10, inp, stcb, NULL);
 8846 #endif
 8847                         /* Push out any control */
 8848                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, &cwnd_full, from_where,
 8849                             &now, &now_filled, frag_point, so_locked);
 8850                         return;
 8851                 }
 8852                 if (tot_frs > asoc->max_burst) {
 8853                         /* Hit FR burst limit */
 8854                         return;
 8855                 }
 8856                 if ((num_out == 0) && (ret == 0)) {
 8857 
 8858                         /* No more retrans to send */
 8859                         break;
 8860                 }
 8861         }
 8862 #ifdef SCTP_AUDITING_ENABLED
 8863         sctp_auditing(12, inp, stcb, NULL);
 8864 #endif
 8865         /* Check for bad destinations, if they exist move chunks around. */
 8866         burst_limit = asoc->max_burst;
 8867         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 8868                 if ((net->dest_state & SCTP_ADDR_NOT_REACHABLE) ==
 8869                     SCTP_ADDR_NOT_REACHABLE) {
 8870                         /*-
 8871                          * if possible move things off of this address we
 8872                          * still may send below due to the dormant state but
 8873                          * we try to find an alternate address to send to
 8874                          * and if we have one we move all queued data on the
 8875                          * out wheel to this alternate address.
 8876                          */
 8877                         if (net->ref_count > 1)
 8878                                 sctp_move_to_an_alt(stcb, asoc, net);
 8879                 } else if (sctp_cmt_on_off && sctp_cmt_pf && ((net->dest_state & SCTP_ADDR_PF) ==
 8880                     SCTP_ADDR_PF)) {
 8881                         /*
 8882                          * JRS 5/14/07 - If CMT PF is on and the current
 8883                          * destination is in PF state, move all queued data
 8884                          * to an alternate desination.
 8885                          */
 8886                         if (net->ref_count > 1)
 8887                                 sctp_move_to_an_alt(stcb, asoc, net);
 8888                 } else {
 8889                         /*-
 8890                          * if ((asoc->sat_network) || (net->addr_is_local))
 8891                          * { burst_limit = asoc->max_burst *
 8892                          * SCTP_SAT_NETWORK_BURST_INCR; }
 8893                          */
 8894                         if (sctp_use_cwnd_based_maxburst) {
 8895                                 if ((net->flight_size + (burst_limit * net->mtu)) < net->cwnd) {
 8896                                         /*
 8897                                          * JRS - Use the congestion control
 8898                                          * given in the congestion control
 8899                                          * module
 8900                                          */
 8901                                         asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, burst_limit);
 8902                                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
 8903                                                 sctp_log_maxburst(stcb, net, 0, burst_limit, SCTP_MAX_BURST_APPLIED);
 8904                                         }
 8905                                         SCTP_STAT_INCR(sctps_maxburstqueued);
 8906                                 }
 8907                                 net->fast_retran_ip = 0;
 8908                         } else {
 8909                                 if (net->flight_size == 0) {
 8910                                         /* Should be decaying the cwnd here */
 8911                                         ;
 8912                                 }
 8913                         }
 8914                 }
 8915 
 8916         }
 8917         burst_cnt = 0;
 8918         cwnd_full = 0;
 8919         do {
 8920                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
 8921                     &reason_code, 0, &cwnd_full, from_where,
 8922                     &now, &now_filled, frag_point, so_locked);
 8923                 if (error) {
 8924                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
 8925                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
 8926                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
 8927                         }
 8928                         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 8929                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
 8930                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
 8931                         }
 8932                         break;
 8933                 }
 8934                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
 8935 
 8936                 tot_out += num_out;
 8937                 burst_cnt++;
 8938                 if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 8939                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
 8940                         if (num_out == 0) {
 8941                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
 8942                         }
 8943                 }
 8944                 if (nagle_on) {
 8945                         /*-
 8946                          * When nagle is on, we look at how much is un_sent, then
 8947                          * if its smaller than an MTU and we have data in
 8948                          * flight we stop.
 8949                          */
 8950                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 8951                             ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count)
 8952                             * sizeof(struct sctp_data_chunk)));
 8953                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
 8954                             (stcb->asoc.total_flight > 0)) {
 8955                                 break;
 8956                         }
 8957                 }
 8958                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 8959                     TAILQ_EMPTY(&asoc->send_queue) &&
 8960                     TAILQ_EMPTY(&asoc->out_wheel)) {
 8961                         /* Nothing left to send */
 8962                         break;
 8963                 }
 8964                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
 8965                         /* Nothing left to send */
 8966                         break;
 8967                 }
 8968         } while (num_out && (sctp_use_cwnd_based_maxburst ||
 8969             (burst_cnt < burst_limit)));
 8970 
 8971         if (sctp_use_cwnd_based_maxburst == 0) {
 8972                 if (burst_cnt >= burst_limit) {
 8973                         SCTP_STAT_INCR(sctps_maxburstqueued);
 8974                         asoc->burst_limit_applied = 1;
 8975                         if (sctp_logging_level & SCTP_LOG_MAXBURST_ENABLE) {
 8976                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
 8977                         }
 8978                 } else {
 8979                         asoc->burst_limit_applied = 0;
 8980                 }
 8981         }
 8982         if (sctp_logging_level & SCTP_CWND_LOGGING_ENABLE) {
 8983                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
 8984         }
 8985         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
 8986             tot_out);
 8987 
 8988         /*-
 8989          * Now we need to clean up the control chunk chain if a ECNE is on
 8990          * it. It must be marked as UNSENT again so next call will continue
 8991          * to send it until such time that we get a CWR, to remove it.
 8992          */
 8993         if (stcb->asoc.ecn_echo_cnt_onq)
 8994                 sctp_fix_ecn_echo(asoc);
 8995         return;
 8996 }
 8997 
 8998 
 8999 int
 9000 sctp_output(inp, m, addr, control, p, flags)
 9001         struct sctp_inpcb *inp;
 9002         struct mbuf *m;
 9003         struct sockaddr *addr;
 9004         struct mbuf *control;
 9005         struct thread *p;
 9006         int flags;
 9007 {
 9008         if (inp == NULL) {
 9009                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 9010                 return (EINVAL);
 9011         }
 9012         if (inp->sctp_socket == NULL) {
 9013                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 9014                 return (EINVAL);
 9015         }
 9016         return (sctp_sosend(inp->sctp_socket,
 9017             addr,
 9018             (struct uio *)NULL,
 9019             m,
 9020             control,
 9021             flags, p
 9022             ));
 9023 }
 9024 
 9025 void
 9026 send_forward_tsn(struct sctp_tcb *stcb,
 9027     struct sctp_association *asoc)
 9028 {
 9029         struct sctp_tmit_chunk *chk;
 9030         struct sctp_forward_tsn_chunk *fwdtsn;
 9031 
 9032         SCTP_TCB_LOCK_ASSERT(stcb);
 9033         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9034                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 9035                         /* mark it to unsent */
 9036                         chk->sent = SCTP_DATAGRAM_UNSENT;
 9037                         chk->snd_count = 0;
 9038                         /* Do we correct its output location? */
 9039                         if (chk->whoTo != asoc->primary_destination) {
 9040                                 sctp_free_remote_addr(chk->whoTo);
 9041                                 chk->whoTo = asoc->primary_destination;
 9042                                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9043                         }
 9044                         goto sctp_fill_in_rest;
 9045                 }
 9046         }
 9047         /* Ok if we reach here we must build one */
 9048         sctp_alloc_a_chunk(stcb, chk);
 9049         if (chk == NULL) {
 9050                 return;
 9051         }
 9052         chk->copy_by_ref = 0;
 9053         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
 9054         chk->rec.chunk_id.can_take_data = 0;
 9055         chk->asoc = asoc;
 9056         chk->whoTo = NULL;
 9057 
 9058         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
 9059         if (chk->data == NULL) {
 9060                 sctp_free_a_chunk(stcb, chk);
 9061                 return;
 9062         }
 9063         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 9064         chk->sent = SCTP_DATAGRAM_UNSENT;
 9065         chk->snd_count = 0;
 9066         chk->whoTo = asoc->primary_destination;
 9067         atomic_add_int(&chk->whoTo->ref_count, 1);
 9068         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
 9069         asoc->ctrl_queue_cnt++;
 9070 sctp_fill_in_rest:
 9071         /*-
 9072          * Here we go through and fill out the part that deals with
 9073          * stream/seq of the ones we skip.
 9074          */
 9075         SCTP_BUF_LEN(chk->data) = 0;
 9076         {
 9077                 struct sctp_tmit_chunk *at, *tp1, *last;
 9078                 struct sctp_strseq *strseq;
 9079                 unsigned int cnt_of_space, i, ovh;
 9080                 unsigned int space_needed;
 9081                 unsigned int cnt_of_skipped = 0;
 9082 
 9083                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
 9084                         if (at->sent != SCTP_FORWARD_TSN_SKIP) {
 9085                                 /* no more to look at */
 9086                                 break;
 9087                         }
 9088                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
 9089                                 /* We don't report these */
 9090                                 continue;
 9091                         }
 9092                         cnt_of_skipped++;
 9093                 }
 9094                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
 9095                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
 9096 
 9097                 cnt_of_space = M_TRAILINGSPACE(chk->data);
 9098 
 9099                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 9100                         ovh = SCTP_MIN_OVERHEAD;
 9101                 } else {
 9102                         ovh = SCTP_MIN_V4_OVERHEAD;
 9103                 }
 9104                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
 9105                         /* trim to a mtu size */
 9106                         cnt_of_space = asoc->smallest_mtu - ovh;
 9107                 }
 9108                 if (cnt_of_space < space_needed) {
 9109                         /*-
 9110                          * ok we must trim down the chunk by lowering the
 9111                          * advance peer ack point.
 9112                          */
 9113                         cnt_of_skipped = (cnt_of_space -
 9114                             ((sizeof(struct sctp_forward_tsn_chunk)) /
 9115                             sizeof(struct sctp_strseq)));
 9116                         /*-
 9117                          * Go through and find the TSN that will be the one
 9118                          * we report.
 9119                          */
 9120                         at = TAILQ_FIRST(&asoc->sent_queue);
 9121                         for (i = 0; i < cnt_of_skipped; i++) {
 9122                                 tp1 = TAILQ_NEXT(at, sctp_next);
 9123                                 at = tp1;
 9124                         }
 9125                         last = at;
 9126                         /*-
 9127                          * last now points to last one I can report, update
 9128                          * peer ack point
 9129                          */
 9130                         asoc->advanced_peer_ack_point = last->rec.data.TSN_seq;
 9131                         space_needed -= (cnt_of_skipped * sizeof(struct sctp_strseq));
 9132                 }
 9133                 chk->send_size = space_needed;
 9134                 /* Setup the chunk */
 9135                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
 9136                 fwdtsn->ch.chunk_length = htons(chk->send_size);
 9137                 fwdtsn->ch.chunk_flags = 0;
 9138                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
 9139                 fwdtsn->new_cumulative_tsn = htonl(asoc->advanced_peer_ack_point);
 9140                 chk->send_size = (sizeof(struct sctp_forward_tsn_chunk) +
 9141                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
 9142                 SCTP_BUF_LEN(chk->data) = chk->send_size;
 9143                 fwdtsn++;
 9144                 /*-
 9145                  * Move pointer to after the fwdtsn and transfer to the
 9146                  * strseq pointer.
 9147                  */
 9148                 strseq = (struct sctp_strseq *)fwdtsn;
 9149                 /*-
 9150                  * Now populate the strseq list. This is done blindly
 9151                  * without pulling out duplicate stream info. This is
 9152                  * inefficent but won't harm the process since the peer will
 9153                  * look at these in sequence and will thus release anything.
 9154                  * It could mean we exceed the PMTU and chop off some that
 9155                  * we could have included.. but this is unlikely (aka 1432/4
 9156                  * would mean 300+ stream seq's would have to be reported in
 9157                  * one FWD-TSN. With a bit of work we can later FIX this to
 9158                  * optimize and pull out duplcates.. but it does add more
 9159                  * overhead. So for now... not!
 9160                  */
 9161                 at = TAILQ_FIRST(&asoc->sent_queue);
 9162                 for (i = 0; i < cnt_of_skipped; i++) {
 9163                         tp1 = TAILQ_NEXT(at, sctp_next);
 9164                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
 9165                                 /* We don't report these */
 9166                                 i--;
 9167                                 at = tp1;
 9168                                 continue;
 9169                         }
 9170                         strseq->stream = ntohs(at->rec.data.stream_number);
 9171                         strseq->sequence = ntohs(at->rec.data.stream_seq);
 9172                         strseq++;
 9173                         at = tp1;
 9174                 }
 9175         }
 9176         return;
 9177 
 9178 }
 9179 
 9180 void
 9181 sctp_send_sack(struct sctp_tcb *stcb)
 9182 {
 9183         /*-
 9184          * Queue up a SACK in the control queue. We must first check to see
 9185          * if a SACK is somehow on the control queue. If so, we will take
 9186          * and and remove the old one.
 9187          */
 9188         struct sctp_association *asoc;
 9189         struct sctp_tmit_chunk *chk, *a_chk;
 9190         struct sctp_sack_chunk *sack;
 9191         struct sctp_gap_ack_block *gap_descriptor;
 9192         struct sack_track *selector;
 9193         int mergeable = 0;
 9194         int offset;
 9195         caddr_t limit;
 9196         uint32_t *dup;
 9197         int limit_reached = 0;
 9198         unsigned int i, jstart, siz, j;
 9199         unsigned int num_gap_blocks = 0, space;
 9200         int num_dups = 0;
 9201         int space_req;
 9202 
 9203         a_chk = NULL;
 9204         asoc = &stcb->asoc;
 9205         SCTP_TCB_LOCK_ASSERT(stcb);
 9206         if (asoc->last_data_chunk_from == NULL) {
 9207                 /* Hmm we never received anything */
 9208                 return;
 9209         }
 9210         sctp_set_rwnd(stcb, asoc);
 9211         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9212                 if (chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) {
 9213                         /* Hmm, found a sack already on queue, remove it */
 9214                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 9215                         asoc->ctrl_queue_cnt++;
 9216                         a_chk = chk;
 9217                         if (a_chk->data) {
 9218                                 sctp_m_freem(a_chk->data);
 9219                                 a_chk->data = NULL;
 9220                         }
 9221                         sctp_free_remote_addr(a_chk->whoTo);
 9222                         a_chk->whoTo = NULL;
 9223                         break;
 9224                 }
 9225         }
 9226         if (a_chk == NULL) {
 9227                 sctp_alloc_a_chunk(stcb, a_chk);
 9228                 if (a_chk == NULL) {
 9229                         /* No memory so we drop the idea, and set a timer */
 9230                         if (stcb->asoc.delayed_ack) {
 9231                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 9232                                     stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
 9233                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
 9234                                     stcb->sctp_ep, stcb, NULL);
 9235                         } else {
 9236                                 stcb->asoc.send_sack = 1;
 9237                         }
 9238                         return;
 9239                 }
 9240                 a_chk->copy_by_ref = 0;
 9241                 /* a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK; */
 9242                 a_chk->rec.chunk_id.id = SCTP_SELECTIVE_ACK;
 9243                 a_chk->rec.chunk_id.can_take_data = 1;
 9244         }
 9245         /* Clear our pkt counts */
 9246         asoc->data_pkts_seen = 0;
 9247 
 9248         a_chk->asoc = asoc;
 9249         a_chk->snd_count = 0;
 9250         a_chk->send_size = 0;   /* fill in later */
 9251         a_chk->sent = SCTP_DATAGRAM_UNSENT;
 9252         a_chk->whoTo = NULL;
 9253 
 9254         if ((asoc->numduptsns) ||
 9255             (asoc->last_data_chunk_from->dest_state & SCTP_ADDR_NOT_REACHABLE)
 9256             ) {
 9257                 /*-
 9258                  * Ok, we have some duplicates or the destination for the
 9259                  * sack is unreachable, lets see if we can select an
 9260                  * alternate than asoc->last_data_chunk_from
 9261                  */
 9262                 if ((!(asoc->last_data_chunk_from->dest_state &
 9263                     SCTP_ADDR_NOT_REACHABLE)) &&
 9264                     (asoc->used_alt_onsack > asoc->numnets)) {
 9265                         /* We used an alt last time, don't this time */
 9266                         a_chk->whoTo = NULL;
 9267                 } else {
 9268                         asoc->used_alt_onsack++;
 9269                         a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
 9270                 }
 9271                 if (a_chk->whoTo == NULL) {
 9272                         /* Nope, no alternate */
 9273                         a_chk->whoTo = asoc->last_data_chunk_from;
 9274                         asoc->used_alt_onsack = 0;
 9275                 }
 9276         } else {
 9277                 /*
 9278                  * No duplicates so we use the last place we received data
 9279                  * from.
 9280                  */
 9281                 asoc->used_alt_onsack = 0;
 9282                 a_chk->whoTo = asoc->last_data_chunk_from;
 9283         }
 9284         if (a_chk->whoTo) {
 9285                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
 9286         }
 9287         if (asoc->highest_tsn_inside_map == asoc->cumulative_tsn) {
 9288                 /* no gaps */
 9289                 space_req = sizeof(struct sctp_sack_chunk);
 9290         } else {
 9291                 /* gaps get a cluster */
 9292                 space_req = MCLBYTES;
 9293         }
 9294         /* Ok now lets formulate a MBUF with our sack */
 9295         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_DONTWAIT, 1, MT_DATA);
 9296         if ((a_chk->data == NULL) ||
 9297             (a_chk->whoTo == NULL)) {
 9298                 /* rats, no mbuf memory */
 9299                 if (a_chk->data) {
 9300                         /* was a problem with the destination */
 9301                         sctp_m_freem(a_chk->data);
 9302                         a_chk->data = NULL;
 9303                 }
 9304                 sctp_free_a_chunk(stcb, a_chk);
 9305                 /* sa_ignore NO_NULL_CHK */
 9306                 if (stcb->asoc.delayed_ack) {
 9307                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 9308                             stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_6);
 9309                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
 9310                             stcb->sctp_ep, stcb, NULL);
 9311                 } else {
 9312                         stcb->asoc.send_sack = 1;
 9313                 }
 9314                 return;
 9315         }
 9316         /* ok, lets go through and fill it in */
 9317         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
 9318         space = M_TRAILINGSPACE(a_chk->data);
 9319         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
 9320                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
 9321         }
 9322         limit = mtod(a_chk->data, caddr_t);
 9323         limit += space;
 9324 
 9325         sack = mtod(a_chk->data, struct sctp_sack_chunk *);
 9326         sack->ch.chunk_type = SCTP_SELECTIVE_ACK;
 9327         /* 0x01 is used by nonce for ecn */
 9328         if ((sctp_ecn_enable) &&
 9329             (sctp_ecn_nonce) &&
 9330             (asoc->peer_supports_ecn_nonce))
 9331                 sack->ch.chunk_flags = (asoc->receiver_nonce_sum & SCTP_SACK_NONCE_SUM);
 9332         else
 9333                 sack->ch.chunk_flags = 0;
 9334 
 9335         if (sctp_cmt_on_off && sctp_cmt_use_dac) {
 9336                 /*-
 9337                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
 9338                  * received, then set high bit to 1, else 0. Reset
 9339                  * pkts_rcvd.
 9340                  */
 9341                 sack->ch.chunk_flags |= (asoc->cmt_dac_pkts_rcvd << 6);
 9342                 asoc->cmt_dac_pkts_rcvd = 0;
 9343         }
 9344 #ifdef SCTP_ASOCLOG_OF_TSNS
 9345         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
 9346         stcb->asoc.cumack_log_atsnt++;
 9347         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
 9348                 stcb->asoc.cumack_log_atsnt = 0;
 9349         }
 9350 #endif
 9351         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
 9352         sack->sack.a_rwnd = htonl(asoc->my_rwnd);
 9353         asoc->my_last_reported_rwnd = asoc->my_rwnd;
 9354 
 9355         /* reset the readers interpretation */
 9356         stcb->freed_by_sorcv_sincelast = 0;
 9357 
 9358         gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
 9359 
 9360         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
 9361         if (compare_with_wrap(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, MAX_TSN)) {
 9362                 offset = 1;
 9363                 /*-
 9364                  * cum-ack behind the mapping array, so we start and use all
 9365                  * entries.
 9366                  */
 9367                 jstart = 0;
 9368         } else {
 9369                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
 9370                 /*-
 9371                  * we skip the first one when the cum-ack is at or above the
 9372                  * mapping array base. Note this only works if
 9373                  */
 9374                 jstart = 1;
 9375         }
 9376         if (compare_with_wrap(asoc->highest_tsn_inside_map, asoc->cumulative_tsn, MAX_TSN)) {
 9377                 /* we have a gap .. maybe */
 9378                 for (i = 0; i < siz; i++) {
 9379                         selector = &sack_array[asoc->mapping_array[i]];
 9380                         if (mergeable && selector->right_edge) {
 9381                                 /*
 9382                                  * Backup, left and right edges were ok to
 9383                                  * merge.
 9384                                  */
 9385                                 num_gap_blocks--;
 9386                                 gap_descriptor--;
 9387                         }
 9388                         if (selector->num_entries == 0)
 9389                                 mergeable = 0;
 9390                         else {
 9391                                 for (j = jstart; j < selector->num_entries; j++) {
 9392                                         if (mergeable && selector->right_edge) {
 9393                                                 /*
 9394                                                  * do a merge by NOT setting
 9395                                                  * the left side
 9396                                                  */
 9397                                                 mergeable = 0;
 9398                                         } else {
 9399                                                 /*
 9400                                                  * no merge, set the left
 9401                                                  * side
 9402                                                  */
 9403                                                 mergeable = 0;
 9404                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
 9405                                         }
 9406                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
 9407                                         num_gap_blocks++;
 9408                                         gap_descriptor++;
 9409                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
 9410                                                 /* no more room */
 9411                                                 limit_reached = 1;
 9412                                                 break;
 9413                                         }
 9414                                 }
 9415                                 if (selector->left_edge) {
 9416                                         mergeable = 1;
 9417                                 }
 9418                         }
 9419                         if (limit_reached) {
 9420                                 /* Reached the limit stop */
 9421                                 break;
 9422                         }
 9423                         jstart = 0;
 9424                         offset += 8;
 9425                 }
 9426                 if (num_gap_blocks == 0) {
 9427                         /*
 9428                          * slide not yet happened, and somehow we got called
 9429                          * to send a sack. Cumack needs to move up.
 9430                          */
 9431                         int abort_flag = 0;
 9432 
 9433                         asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
 9434                         sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
 9435                         sctp_sack_check(stcb, 0, 0, &abort_flag);
 9436                 }
 9437         }
 9438         /* now we must add any dups we are going to report. */
 9439         if ((limit_reached == 0) && (asoc->numduptsns)) {
 9440                 dup = (uint32_t *) gap_descriptor;
 9441                 for (i = 0; i < asoc->numduptsns; i++) {
 9442                         *dup = htonl(asoc->dup_tsns[i]);
 9443                         dup++;
 9444                         num_dups++;
 9445                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
 9446                                 /* no more room */
 9447                                 break;
 9448                         }
 9449                 }
 9450                 asoc->numduptsns = 0;
 9451         }
 9452         /*
 9453          * now that the chunk is prepared queue it to the control chunk
 9454          * queue.
 9455          */
 9456         a_chk->send_size = (sizeof(struct sctp_sack_chunk) +
 9457             (num_gap_blocks * sizeof(struct sctp_gap_ack_block)) +
 9458             (num_dups * sizeof(int32_t)));
 9459         SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
 9460         sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
 9461         sack->sack.num_dup_tsns = htons(num_dups);
 9462         sack->ch.chunk_length = htons(a_chk->send_size);
 9463         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
 9464         asoc->ctrl_queue_cnt++;
 9465         asoc->send_sack = 0;
 9466         SCTP_STAT_INCR(sctps_sendsacks);
 9467         return;
 9468 }
 9469 
 9470 
 9471 void
 9472 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
 9473 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9474     SCTP_UNUSED
 9475 #endif
 9476 )
 9477 {
 9478         struct mbuf *m_abort;
 9479         struct mbuf *m_out = NULL, *m_end = NULL;
 9480         struct sctp_abort_chunk *abort = NULL;
 9481         int sz;
 9482         uint32_t auth_offset = 0;
 9483         struct sctp_auth_chunk *auth = NULL;
 9484         struct sctphdr *shdr;
 9485 
 9486         /*-
 9487          * Add an AUTH chunk, if chunk requires it and save the offset into
 9488          * the chain for AUTH
 9489          */
 9490         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
 9491             stcb->asoc.peer_auth_chunks)) {
 9492                 m_out = sctp_add_auth_chunk(m_out, &m_end, &auth, &auth_offset,
 9493                     stcb, SCTP_ABORT_ASSOCIATION);
 9494         }
 9495         SCTP_TCB_LOCK_ASSERT(stcb);
 9496         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_DONTWAIT, 1, MT_HEADER);
 9497         if (m_abort == NULL) {
 9498                 /* no mbuf's */
 9499                 if (m_out)
 9500                         sctp_m_freem(m_out);
 9501                 return;
 9502         }
 9503         /* link in any error */
 9504         SCTP_BUF_NEXT(m_abort) = operr;
 9505         sz = 0;
 9506         if (operr) {
 9507                 struct mbuf *n;
 9508 
 9509                 n = operr;
 9510                 while (n) {
 9511                         sz += SCTP_BUF_LEN(n);
 9512                         n = SCTP_BUF_NEXT(n);
 9513                 }
 9514         }
 9515         SCTP_BUF_LEN(m_abort) = sizeof(*abort);
 9516         if (m_out == NULL) {
 9517                 /* NO Auth chunk prepended, so reserve space in front */
 9518                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
 9519                 m_out = m_abort;
 9520         } else {
 9521                 /* Put AUTH chunk at the front of the chain */
 9522                 SCTP_BUF_NEXT(m_end) = m_abort;
 9523         }
 9524 
 9525         /* fill in the ABORT chunk */
 9526         abort = mtod(m_abort, struct sctp_abort_chunk *);
 9527         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
 9528         abort->ch.chunk_flags = 0;
 9529         abort->ch.chunk_length = htons(sizeof(*abort) + sz);
 9530 
 9531         /* prepend and fill in the SCTP header */
 9532         SCTP_BUF_PREPEND(m_out, sizeof(struct sctphdr), M_DONTWAIT);
 9533         if (m_out == NULL) {
 9534                 /* TSNH: no memory */
 9535                 return;
 9536         }
 9537         shdr = mtod(m_out, struct sctphdr *);
 9538         shdr->src_port = stcb->sctp_ep->sctp_lport;
 9539         shdr->dest_port = stcb->rport;
 9540         shdr->v_tag = htonl(stcb->asoc.peer_vtag);
 9541         shdr->checksum = 0;
 9542         auth_offset += sizeof(struct sctphdr);
 9543 
 9544         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb,
 9545             stcb->asoc.primary_destination,
 9546             (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr,
 9547             m_out, auth_offset, auth, 1, 0, NULL, 0, so_locked);
 9548         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9549 }
 9550 
 9551 void
 9552 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
 9553     struct sctp_nets *net)
 9554 {
 9555         /* formulate and SEND a SHUTDOWN-COMPLETE */
 9556         struct mbuf *m_shutdown_comp;
 9557         struct sctp_shutdown_complete_msg *comp_cp;
 9558 
 9559         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_complete_msg), 0, M_DONTWAIT, 1, MT_HEADER);
 9560         if (m_shutdown_comp == NULL) {
 9561                 /* no mbuf's */
 9562                 return;
 9563         }
 9564         comp_cp = mtod(m_shutdown_comp, struct sctp_shutdown_complete_msg *);
 9565         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
 9566         comp_cp->shut_cmp.ch.chunk_flags = 0;
 9567         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
 9568         comp_cp->sh.src_port = stcb->sctp_ep->sctp_lport;
 9569         comp_cp->sh.dest_port = stcb->rport;
 9570         comp_cp->sh.v_tag = htonl(stcb->asoc.peer_vtag);
 9571         comp_cp->sh.checksum = 0;
 9572 
 9573         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_msg);
 9574         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
 9575             (struct sockaddr *)&net->ro._l_addr,
 9576             m_shutdown_comp, 0, NULL, 1, 0, NULL, 0, SCTP_SO_NOT_LOCKED);
 9577         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9578         return;
 9579 }
 9580 
 9581 void
 9582 sctp_send_shutdown_complete2(struct mbuf *m, int iphlen, struct sctphdr *sh,
 9583     uint32_t vrf_id)
 9584 {
 9585         /* formulate and SEND a SHUTDOWN-COMPLETE */
 9586         struct mbuf *o_pak;
 9587         struct mbuf *mout;
 9588         struct ip *iph, *iph_out;
 9589         struct ip6_hdr *ip6, *ip6_out;
 9590         int offset_out, len, mlen;
 9591         struct sctp_shutdown_complete_msg *comp_cp;
 9592 
 9593         /* Get room for the largest message */
 9594         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_shutdown_complete_msg));
 9595         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
 9596         if (mout == NULL) {
 9597                 return;
 9598         }
 9599         SCTP_BUF_LEN(mout) = len;
 9600         iph = mtod(m, struct ip *);
 9601         iph_out = NULL;
 9602         ip6_out = NULL;
 9603         offset_out = 0;
 9604         if (iph->ip_v == IPVERSION) {
 9605                 SCTP_BUF_LEN(mout) = sizeof(struct ip) +
 9606                     sizeof(struct sctp_shutdown_complete_msg);
 9607                 SCTP_BUF_NEXT(mout) = NULL;
 9608                 iph_out = mtod(mout, struct ip *);
 9609 
 9610                 /* Fill in the IP header for the ABORT */
 9611                 iph_out->ip_v = IPVERSION;
 9612                 iph_out->ip_hl = (sizeof(struct ip) / 4);
 9613                 iph_out->ip_tos = (u_char)0;
 9614                 iph_out->ip_id = 0;
 9615                 iph_out->ip_off = 0;
 9616                 iph_out->ip_ttl = MAXTTL;
 9617                 iph_out->ip_p = IPPROTO_SCTP;
 9618                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
 9619                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
 9620 
 9621                 /* let IP layer calculate this */
 9622                 iph_out->ip_sum = 0;
 9623                 offset_out += sizeof(*iph_out);
 9624                 comp_cp = (struct sctp_shutdown_complete_msg *)(
 9625                     (caddr_t)iph_out + offset_out);
 9626         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
 9627                 ip6 = (struct ip6_hdr *)iph;
 9628                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr) +
 9629                     sizeof(struct sctp_shutdown_complete_msg);
 9630                 SCTP_BUF_NEXT(mout) = NULL;
 9631                 ip6_out = mtod(mout, struct ip6_hdr *);
 9632 
 9633                 /* Fill in the IPv6 header for the ABORT */
 9634                 ip6_out->ip6_flow = ip6->ip6_flow;
 9635                 ip6_out->ip6_hlim = ip6_defhlim;
 9636                 ip6_out->ip6_nxt = IPPROTO_SCTP;
 9637                 ip6_out->ip6_src = ip6->ip6_dst;
 9638                 ip6_out->ip6_dst = ip6->ip6_src;
 9639                 /*
 9640                  * ?? The old code had both the iph len + payload, I think
 9641                  * this is wrong and would never have worked
 9642                  */
 9643                 ip6_out->ip6_plen = sizeof(struct sctp_shutdown_complete_msg);
 9644                 offset_out += sizeof(*ip6_out);
 9645                 comp_cp = (struct sctp_shutdown_complete_msg *)(
 9646                     (caddr_t)ip6_out + offset_out);
 9647         } else {
 9648                 /* Currently not supported. */
 9649                 return;
 9650         }
 9651         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 9652                 /* no mbuf's */
 9653                 sctp_m_freem(mout);
 9654                 return;
 9655         }
 9656         /* Now copy in and fill in the ABORT tags etc. */
 9657         comp_cp->sh.src_port = sh->dest_port;
 9658         comp_cp->sh.dest_port = sh->src_port;
 9659         comp_cp->sh.checksum = 0;
 9660         comp_cp->sh.v_tag = sh->v_tag;
 9661         comp_cp->shut_cmp.ch.chunk_flags = SCTP_HAD_NO_TCB;
 9662         comp_cp->shut_cmp.ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
 9663         comp_cp->shut_cmp.ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
 9664 
 9665         /* add checksum */
 9666         comp_cp->sh.checksum = sctp_calculate_sum(mout, NULL, offset_out);
 9667         if (iph_out != NULL) {
 9668                 sctp_route_t ro;
 9669                 int ret;
 9670                 struct sctp_tcb *stcb = NULL;
 9671 
 9672                 mlen = SCTP_BUF_LEN(mout);
 9673                 bzero(&ro, sizeof ro);
 9674                 /* set IPv4 length */
 9675                 iph_out->ip_len = mlen;
 9676 #ifdef  SCTP_PACKET_LOGGING
 9677                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
 9678                         sctp_packet_log(mout, mlen);
 9679 #endif
 9680                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
 9681 
 9682                 /* out it goes */
 9683                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
 9684 
 9685                 /* Free the route if we got one back */
 9686                 if (ro.ro_rt)
 9687                         RTFREE(ro.ro_rt);
 9688         } else if (ip6_out != NULL) {
 9689                 struct route_in6 ro;
 9690                 int ret;
 9691                 struct sctp_tcb *stcb = NULL;
 9692                 struct ifnet *ifp = NULL;
 9693 
 9694                 bzero(&ro, sizeof(ro));
 9695                 mlen = SCTP_BUF_LEN(mout);
 9696 #ifdef  SCTP_PACKET_LOGGING
 9697                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
 9698                         sctp_packet_log(mout, mlen);
 9699 #endif
 9700                 SCTP_ATTACH_CHAIN(o_pak, mout, mlen);
 9701                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
 9702 
 9703                 /* Free the route if we got one back */
 9704                 if (ro.ro_rt)
 9705                         RTFREE(ro.ro_rt);
 9706         }
 9707         SCTP_STAT_INCR(sctps_sendpackets);
 9708         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 9709         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9710         return;
 9711 
 9712 }
 9713 
 9714 static struct sctp_nets *
 9715 sctp_select_hb_destination(struct sctp_tcb *stcb, struct timeval *now)
 9716 {
 9717         struct sctp_nets *net, *hnet;
 9718         int ms_goneby, highest_ms, state_overide = 0;
 9719 
 9720         (void)SCTP_GETTIME_TIMEVAL(now);
 9721         highest_ms = 0;
 9722         hnet = NULL;
 9723         SCTP_TCB_LOCK_ASSERT(stcb);
 9724         TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
 9725                 if (
 9726                     ((net->dest_state & SCTP_ADDR_NOHB) && ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0)) ||
 9727                     (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)
 9728                     ) {
 9729                         /*
 9730                          * Skip this guy from consideration if HB is off AND
 9731                          * its confirmed
 9732                          */
 9733                         continue;
 9734                 }
 9735                 if (sctp_destination_is_reachable(stcb, (struct sockaddr *)&net->ro._l_addr) == 0) {
 9736                         /* skip this dest net from consideration */
 9737                         continue;
 9738                 }
 9739                 if (net->last_sent_time.tv_sec) {
 9740                         /* Sent to so we subtract */
 9741                         ms_goneby = (now->tv_sec - net->last_sent_time.tv_sec) * 1000;
 9742                 } else
 9743                         /* Never been sent to */
 9744                         ms_goneby = 0x7fffffff;
 9745                 /*-
 9746                  * When the address state is unconfirmed but still
 9747                  * considered reachable, we HB at a higher rate. Once it
 9748                  * goes confirmed OR reaches the "unreachable" state, thenw
 9749                  * we cut it back to HB at a more normal pace.
 9750                  */
 9751                 if ((net->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED) {
 9752                         state_overide = 1;
 9753                 } else {
 9754                         state_overide = 0;
 9755                 }
 9756 
 9757                 if ((((unsigned int)ms_goneby >= net->RTO) || (state_overide)) &&
 9758                     (ms_goneby > highest_ms)) {
 9759                         highest_ms = ms_goneby;
 9760                         hnet = net;
 9761                 }
 9762         }
 9763         if (hnet &&
 9764             ((hnet->dest_state & (SCTP_ADDR_UNCONFIRMED | SCTP_ADDR_NOT_REACHABLE)) == SCTP_ADDR_UNCONFIRMED)) {
 9765                 state_overide = 1;
 9766         } else {
 9767                 state_overide = 0;
 9768         }
 9769 
 9770         if (hnet && highest_ms && (((unsigned int)highest_ms >= hnet->RTO) || state_overide)) {
 9771                 /*-
 9772                  * Found the one with longest delay bounds OR it is
 9773                  * unconfirmed and still not marked unreachable.
 9774                  */
 9775                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "net:%p is the hb winner -", hnet);
 9776 #ifdef SCTP_DEBUG
 9777                 if (hnet) {
 9778                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT4,
 9779                             (struct sockaddr *)&hnet->ro._l_addr);
 9780                 } else {
 9781                         SCTPDBG(SCTP_DEBUG_OUTPUT4, " none\n");
 9782                 }
 9783 #endif
 9784                 /* update the timer now */
 9785                 hnet->last_sent_time = *now;
 9786                 return (hnet);
 9787         }
 9788         /* Nothing to HB */
 9789         return (NULL);
 9790 }
 9791 
 9792 int
 9793 sctp_send_hb(struct sctp_tcb *stcb, int user_req, struct sctp_nets *u_net)
 9794 {
 9795         struct sctp_tmit_chunk *chk;
 9796         struct sctp_nets *net;
 9797         struct sctp_heartbeat_chunk *hb;
 9798         struct timeval now;
 9799         struct sockaddr_in *sin;
 9800         struct sockaddr_in6 *sin6;
 9801 
 9802         SCTP_TCB_LOCK_ASSERT(stcb);
 9803         if (user_req == 0) {
 9804                 net = sctp_select_hb_destination(stcb, &now);
 9805                 if (net == NULL) {
 9806                         /*-
 9807                          * All our busy none to send to, just start the
 9808                          * timer again.
 9809                          */
 9810                         if (stcb->asoc.state == 0) {
 9811                                 return (0);
 9812                         }
 9813                         sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT,
 9814                             stcb->sctp_ep,
 9815                             stcb,
 9816                             net);
 9817                         return (0);
 9818                 }
 9819         } else {
 9820                 net = u_net;
 9821                 if (net == NULL) {
 9822                         return (0);
 9823                 }
 9824                 (void)SCTP_GETTIME_TIMEVAL(&now);
 9825         }
 9826         sin = (struct sockaddr_in *)&net->ro._l_addr;
 9827         if (sin->sin_family != AF_INET) {
 9828                 if (sin->sin_family != AF_INET6) {
 9829                         /* huh */
 9830                         return (0);
 9831                 }
 9832         }
 9833         sctp_alloc_a_chunk(stcb, chk);
 9834         if (chk == NULL) {
 9835                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
 9836                 return (0);
 9837         }
 9838         chk->copy_by_ref = 0;
 9839         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
 9840         chk->rec.chunk_id.can_take_data = 1;
 9841         chk->asoc = &stcb->asoc;
 9842         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
 9843 
 9844         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
 9845         if (chk->data == NULL) {
 9846                 sctp_free_a_chunk(stcb, chk);
 9847                 return (0);
 9848         }
 9849         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 9850         SCTP_BUF_LEN(chk->data) = chk->send_size;
 9851         chk->sent = SCTP_DATAGRAM_UNSENT;
 9852         chk->snd_count = 0;
 9853         chk->whoTo = net;
 9854         atomic_add_int(&chk->whoTo->ref_count, 1);
 9855         /* Now we have a mbuf that we can fill in with the details */
 9856         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
 9857         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
 9858         /* fill out chunk header */
 9859         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
 9860         hb->ch.chunk_flags = 0;
 9861         hb->ch.chunk_length = htons(chk->send_size);
 9862         /* Fill out hb parameter */
 9863         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
 9864         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
 9865         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
 9866         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
 9867         /* Did our user request this one, put it in */
 9868         hb->heartbeat.hb_info.user_req = user_req;
 9869         hb->heartbeat.hb_info.addr_family = sin->sin_family;
 9870         hb->heartbeat.hb_info.addr_len = sin->sin_len;
 9871         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 9872                 /*
 9873                  * we only take from the entropy pool if the address is not
 9874                  * confirmed.
 9875                  */
 9876                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 9877                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
 9878         } else {
 9879                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
 9880                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
 9881         }
 9882         if (sin->sin_family == AF_INET) {
 9883                 memcpy(hb->heartbeat.hb_info.address, &sin->sin_addr, sizeof(sin->sin_addr));
 9884         } else if (sin->sin_family == AF_INET6) {
 9885                 /* We leave the scope the way it is in our lookup table. */
 9886                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 9887                 memcpy(hb->heartbeat.hb_info.address, &sin6->sin6_addr, sizeof(sin6->sin6_addr));
 9888         } else {
 9889                 /* huh compiler bug */
 9890                 return (0);
 9891         }
 9892 
 9893         /*
 9894          * JRS 5/14/07 - In CMT PF, the T3 timer is used to track
 9895          * PF-heartbeats.  Because of this, threshold management is done by
 9896          * the t3 timer handler, and does not need to be done upon the send
 9897          * of a PF-heartbeat. If CMT PF is on and the destination to which a
 9898          * heartbeat is being sent is in PF state, do NOT do threshold
 9899          * management.
 9900          */
 9901         if ((sctp_cmt_pf == 0) || ((net->dest_state & SCTP_ADDR_PF) != SCTP_ADDR_PF)) {
 9902                 /* ok we have a destination that needs a beat */
 9903                 /* lets do the theshold management Qiaobing style */
 9904                 if (sctp_threshold_management(stcb->sctp_ep, stcb, net,
 9905                     stcb->asoc.max_send_times)) {
 9906                         /*-
 9907                          * we have lost the association, in a way this is
 9908                          * quite bad since we really are one less time since
 9909                          * we really did not send yet. This is the down side
 9910                          * to the Q's style as defined in the RFC and not my
 9911                          * alternate style defined in the RFC.
 9912                          */
 9913                         if (chk->data != NULL) {
 9914                                 sctp_m_freem(chk->data);
 9915                                 chk->data = NULL;
 9916                         }
 9917                         /*
 9918                          * Here we do NOT use the macro since the
 9919                          * association is now gone.
 9920                          */
 9921                         if (chk->whoTo) {
 9922                                 sctp_free_remote_addr(chk->whoTo);
 9923                                 chk->whoTo = NULL;
 9924                         }
 9925                         sctp_free_a_chunk((struct sctp_tcb *)NULL, chk);
 9926                         return (-1);
 9927                 }
 9928         }
 9929         net->hb_responded = 0;
 9930         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
 9931         stcb->asoc.ctrl_queue_cnt++;
 9932         SCTP_STAT_INCR(sctps_sendheartbeat);
 9933         /*-
 9934          * Call directly med level routine to put out the chunk. It will
 9935          * always tumble out control chunks aka HB but it may even tumble
 9936          * out data too.
 9937          */
 9938         return (1);
 9939 }
 9940 
 9941 void
 9942 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
 9943     uint32_t high_tsn)
 9944 {
 9945         struct sctp_association *asoc;
 9946         struct sctp_ecne_chunk *ecne;
 9947         struct sctp_tmit_chunk *chk;
 9948 
 9949         asoc = &stcb->asoc;
 9950         SCTP_TCB_LOCK_ASSERT(stcb);
 9951         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9952                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 9953                         /* found a previous ECN_ECHO update it if needed */
 9954                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 9955                         ecne->tsn = htonl(high_tsn);
 9956                         return;
 9957                 }
 9958         }
 9959         /* nope could not find one to update so we must build one */
 9960         sctp_alloc_a_chunk(stcb, chk);
 9961         if (chk == NULL) {
 9962                 return;
 9963         }
 9964         chk->copy_by_ref = 0;
 9965         SCTP_STAT_INCR(sctps_sendecne);
 9966         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
 9967         chk->rec.chunk_id.can_take_data = 0;
 9968         chk->asoc = &stcb->asoc;
 9969         chk->send_size = sizeof(struct sctp_ecne_chunk);
 9970         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
 9971         if (chk->data == NULL) {
 9972                 sctp_free_a_chunk(stcb, chk);
 9973                 return;
 9974         }
 9975         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
 9976         SCTP_BUF_LEN(chk->data) = chk->send_size;
 9977         chk->sent = SCTP_DATAGRAM_UNSENT;
 9978         chk->snd_count = 0;
 9979         chk->whoTo = net;
 9980         atomic_add_int(&chk->whoTo->ref_count, 1);
 9981         stcb->asoc.ecn_echo_cnt_onq++;
 9982         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
 9983         ecne->ch.chunk_type = SCTP_ECN_ECHO;
 9984         ecne->ch.chunk_flags = 0;
 9985         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
 9986         ecne->tsn = htonl(high_tsn);
 9987         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
 9988         asoc->ctrl_queue_cnt++;
 9989 }
 9990 
 9991 void
 9992 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
 9993     struct mbuf *m, int iphlen, int bad_crc)
 9994 {
 9995         struct sctp_association *asoc;
 9996         struct sctp_pktdrop_chunk *drp;
 9997         struct sctp_tmit_chunk *chk;
 9998         uint8_t *datap;
 9999         int len;
10000         int was_trunc = 0;
10001         struct ip *iph;
10002         int fullsz = 0, extra = 0;
10003         long spc;
10004         int offset;
10005         struct sctp_chunkhdr *ch, chunk_buf;
10006         unsigned int chk_length;
10007 
10008         if (!stcb) {
10009                 return;
10010         }
10011         asoc = &stcb->asoc;
10012         SCTP_TCB_LOCK_ASSERT(stcb);
10013         if (asoc->peer_supports_pktdrop == 0) {
10014                 /*-
10015                  * peer must declare support before I send one.
10016                  */
10017                 return;
10018         }
10019         if (stcb->sctp_socket == NULL) {
10020                 return;
10021         }
10022         sctp_alloc_a_chunk(stcb, chk);
10023         if (chk == NULL) {
10024                 return;
10025         }
10026         chk->copy_by_ref = 0;
10027         iph = mtod(m, struct ip *);
10028         if (iph == NULL) {
10029                 sctp_free_a_chunk(stcb, chk);
10030                 return;
10031         }
10032         if (iph->ip_v == IPVERSION) {
10033                 /* IPv4 */
10034                 len = chk->send_size = iph->ip_len;
10035         } else {
10036                 struct ip6_hdr *ip6h;
10037 
10038                 /* IPv6 */
10039                 ip6h = mtod(m, struct ip6_hdr *);
10040                 len = chk->send_size = htons(ip6h->ip6_plen);
10041         }
10042         /* Validate that we do not have an ABORT in here. */
10043         offset = iphlen + sizeof(struct sctphdr);
10044         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10045             sizeof(*ch), (uint8_t *) & chunk_buf);
10046         while (ch != NULL) {
10047                 chk_length = ntohs(ch->chunk_length);
10048                 if (chk_length < sizeof(*ch)) {
10049                         /* break to abort land */
10050                         break;
10051                 }
10052                 switch (ch->chunk_type) {
10053                 case SCTP_PACKET_DROPPED:
10054                 case SCTP_ABORT_ASSOCIATION:
10055                         /*-
10056                          * we don't respond with an PKT-DROP to an ABORT
10057                          * or PKT-DROP
10058                          */
10059                         sctp_free_a_chunk(stcb, chk);
10060                         return;
10061                 default:
10062                         break;
10063                 }
10064                 offset += SCTP_SIZE32(chk_length);
10065                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
10066                     sizeof(*ch), (uint8_t *) & chunk_buf);
10067         }
10068 
10069         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
10070             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
10071                 /*
10072                  * only send 1 mtu worth, trim off the excess on the end.
10073                  */
10074                 fullsz = len - extra;
10075                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
10076                 was_trunc = 1;
10077         }
10078         chk->asoc = &stcb->asoc;
10079         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10080         if (chk->data == NULL) {
10081 jump_out:
10082                 sctp_free_a_chunk(stcb, chk);
10083                 return;
10084         }
10085         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10086         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
10087         if (drp == NULL) {
10088                 sctp_m_freem(chk->data);
10089                 chk->data = NULL;
10090                 goto jump_out;
10091         }
10092         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
10093             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
10094         chk->book_size_scale = 0;
10095         if (was_trunc) {
10096                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
10097                 drp->trunc_len = htons(fullsz);
10098                 /*
10099                  * Len is already adjusted to size minus overhead above take
10100                  * out the pkt_drop chunk itself from it.
10101                  */
10102                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
10103                 len = chk->send_size;
10104         } else {
10105                 /* no truncation needed */
10106                 drp->ch.chunk_flags = 0;
10107                 drp->trunc_len = htons(0);
10108         }
10109         if (bad_crc) {
10110                 drp->ch.chunk_flags |= SCTP_BADCRC;
10111         }
10112         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
10113         SCTP_BUF_LEN(chk->data) = chk->send_size;
10114         chk->sent = SCTP_DATAGRAM_UNSENT;
10115         chk->snd_count = 0;
10116         if (net) {
10117                 /* we should hit here */
10118                 chk->whoTo = net;
10119         } else {
10120                 chk->whoTo = asoc->primary_destination;
10121         }
10122         atomic_add_int(&chk->whoTo->ref_count, 1);
10123         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
10124         chk->rec.chunk_id.can_take_data = 1;
10125         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
10126         drp->ch.chunk_length = htons(chk->send_size);
10127         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
10128         if (spc < 0) {
10129                 spc = 0;
10130         }
10131         drp->bottle_bw = htonl(spc);
10132         if (asoc->my_rwnd) {
10133                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
10134                     asoc->size_on_all_streams +
10135                     asoc->my_rwnd_control_len +
10136                     stcb->sctp_socket->so_rcv.sb_cc);
10137         } else {
10138                 /*-
10139                  * If my rwnd is 0, possibly from mbuf depletion as well as
10140                  * space used, tell the peer there is NO space aka onq == bw
10141                  */
10142                 drp->current_onq = htonl(spc);
10143         }
10144         drp->reserved = 0;
10145         datap = drp->data;
10146         m_copydata(m, iphlen, len, (caddr_t)datap);
10147         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10148         asoc->ctrl_queue_cnt++;
10149 }
10150 
10151 void
10152 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn)
10153 {
10154         struct sctp_association *asoc;
10155         struct sctp_cwr_chunk *cwr;
10156         struct sctp_tmit_chunk *chk;
10157 
10158         asoc = &stcb->asoc;
10159         SCTP_TCB_LOCK_ASSERT(stcb);
10160         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10161                 if (chk->rec.chunk_id.id == SCTP_ECN_CWR) {
10162                         /* found a previous ECN_CWR update it if needed */
10163                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10164                         if (compare_with_wrap(high_tsn, ntohl(cwr->tsn),
10165                             MAX_TSN)) {
10166                                 cwr->tsn = htonl(high_tsn);
10167                         }
10168                         return;
10169                 }
10170         }
10171         /* nope could not find one to update so we must build one */
10172         sctp_alloc_a_chunk(stcb, chk);
10173         if (chk == NULL) {
10174                 return;
10175         }
10176         chk->copy_by_ref = 0;
10177         chk->rec.chunk_id.id = SCTP_ECN_CWR;
10178         chk->rec.chunk_id.can_take_data = 1;
10179         chk->asoc = &stcb->asoc;
10180         chk->send_size = sizeof(struct sctp_cwr_chunk);
10181         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_DONTWAIT, 1, MT_HEADER);
10182         if (chk->data == NULL) {
10183                 sctp_free_a_chunk(stcb, chk);
10184                 return;
10185         }
10186         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10187         SCTP_BUF_LEN(chk->data) = chk->send_size;
10188         chk->sent = SCTP_DATAGRAM_UNSENT;
10189         chk->snd_count = 0;
10190         chk->whoTo = net;
10191         atomic_add_int(&chk->whoTo->ref_count, 1);
10192         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
10193         cwr->ch.chunk_type = SCTP_ECN_CWR;
10194         cwr->ch.chunk_flags = 0;
10195         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
10196         cwr->tsn = htonl(high_tsn);
10197         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
10198         asoc->ctrl_queue_cnt++;
10199 }
10200 
10201 void
10202 sctp_add_stream_reset_out(struct sctp_tmit_chunk *chk,
10203     int number_entries, uint16_t * list,
10204     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
10205 {
10206         int len, old_len, i;
10207         struct sctp_stream_reset_out_request *req_out;
10208         struct sctp_chunkhdr *ch;
10209 
10210         ch = mtod(chk->data, struct sctp_chunkhdr *);
10211 
10212 
10213         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10214 
10215         /* get to new offset for the param. */
10216         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
10217         /* now how long will this param be? */
10218         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
10219         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
10220         req_out->ph.param_length = htons(len);
10221         req_out->request_seq = htonl(seq);
10222         req_out->response_seq = htonl(resp_seq);
10223         req_out->send_reset_at_tsn = htonl(last_sent);
10224         if (number_entries) {
10225                 for (i = 0; i < number_entries; i++) {
10226                         req_out->list_of_streams[i] = htons(list[i]);
10227                 }
10228         }
10229         if (SCTP_SIZE32(len) > len) {
10230                 /*-
10231                  * Need to worry about the pad we may end up adding to the
10232                  * end. This is easy since the struct is either aligned to 4
10233                  * bytes or 2 bytes off.
10234                  */
10235                 req_out->list_of_streams[number_entries] = 0;
10236         }
10237         /* now fix the chunk length */
10238         ch->chunk_length = htons(len + old_len);
10239         chk->book_size = len + old_len;
10240         chk->book_size_scale = 0;
10241         chk->send_size = SCTP_SIZE32(chk->book_size);
10242         SCTP_BUF_LEN(chk->data) = chk->send_size;
10243         return;
10244 }
10245 
10246 
10247 void
10248 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
10249     int number_entries, uint16_t * list,
10250     uint32_t seq)
10251 {
10252         int len, old_len, i;
10253         struct sctp_stream_reset_in_request *req_in;
10254         struct sctp_chunkhdr *ch;
10255 
10256         ch = mtod(chk->data, struct sctp_chunkhdr *);
10257 
10258 
10259         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10260 
10261         /* get to new offset for the param. */
10262         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
10263         /* now how long will this param be? */
10264         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
10265         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
10266         req_in->ph.param_length = htons(len);
10267         req_in->request_seq = htonl(seq);
10268         if (number_entries) {
10269                 for (i = 0; i < number_entries; i++) {
10270                         req_in->list_of_streams[i] = htons(list[i]);
10271                 }
10272         }
10273         if (SCTP_SIZE32(len) > len) {
10274                 /*-
10275                  * Need to worry about the pad we may end up adding to the
10276                  * end. This is easy since the struct is either aligned to 4
10277                  * bytes or 2 bytes off.
10278                  */
10279                 req_in->list_of_streams[number_entries] = 0;
10280         }
10281         /* now fix the chunk length */
10282         ch->chunk_length = htons(len + old_len);
10283         chk->book_size = len + old_len;
10284         chk->book_size_scale = 0;
10285         chk->send_size = SCTP_SIZE32(chk->book_size);
10286         SCTP_BUF_LEN(chk->data) = chk->send_size;
10287         return;
10288 }
10289 
10290 
10291 void
10292 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
10293     uint32_t seq)
10294 {
10295         int len, old_len;
10296         struct sctp_stream_reset_tsn_request *req_tsn;
10297         struct sctp_chunkhdr *ch;
10298 
10299         ch = mtod(chk->data, struct sctp_chunkhdr *);
10300 
10301 
10302         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10303 
10304         /* get to new offset for the param. */
10305         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
10306         /* now how long will this param be? */
10307         len = sizeof(struct sctp_stream_reset_tsn_request);
10308         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
10309         req_tsn->ph.param_length = htons(len);
10310         req_tsn->request_seq = htonl(seq);
10311 
10312         /* now fix the chunk length */
10313         ch->chunk_length = htons(len + old_len);
10314         chk->send_size = len + old_len;
10315         chk->book_size = SCTP_SIZE32(chk->send_size);
10316         chk->book_size_scale = 0;
10317         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
10318         return;
10319 }
10320 
10321 void
10322 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
10323     uint32_t resp_seq, uint32_t result)
10324 {
10325         int len, old_len;
10326         struct sctp_stream_reset_response *resp;
10327         struct sctp_chunkhdr *ch;
10328 
10329         ch = mtod(chk->data, struct sctp_chunkhdr *);
10330 
10331 
10332         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10333 
10334         /* get to new offset for the param. */
10335         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
10336         /* now how long will this param be? */
10337         len = sizeof(struct sctp_stream_reset_response);
10338         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10339         resp->ph.param_length = htons(len);
10340         resp->response_seq = htonl(resp_seq);
10341         resp->result = ntohl(result);
10342 
10343         /* now fix the chunk length */
10344         ch->chunk_length = htons(len + old_len);
10345         chk->book_size = len + old_len;
10346         chk->book_size_scale = 0;
10347         chk->send_size = SCTP_SIZE32(chk->book_size);
10348         SCTP_BUF_LEN(chk->data) = chk->send_size;
10349         return;
10350 
10351 }
10352 
10353 
10354 void
10355 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
10356     uint32_t resp_seq, uint32_t result,
10357     uint32_t send_una, uint32_t recv_next)
10358 {
10359         int len, old_len;
10360         struct sctp_stream_reset_response_tsn *resp;
10361         struct sctp_chunkhdr *ch;
10362 
10363         ch = mtod(chk->data, struct sctp_chunkhdr *);
10364 
10365 
10366         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
10367 
10368         /* get to new offset for the param. */
10369         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
10370         /* now how long will this param be? */
10371         len = sizeof(struct sctp_stream_reset_response_tsn);
10372         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
10373         resp->ph.param_length = htons(len);
10374         resp->response_seq = htonl(resp_seq);
10375         resp->result = htonl(result);
10376         resp->senders_next_tsn = htonl(send_una);
10377         resp->receivers_next_tsn = htonl(recv_next);
10378 
10379         /* now fix the chunk length */
10380         ch->chunk_length = htons(len + old_len);
10381         chk->book_size = len + old_len;
10382         chk->send_size = SCTP_SIZE32(chk->book_size);
10383         chk->book_size_scale = 0;
10384         SCTP_BUF_LEN(chk->data) = chk->send_size;
10385         return;
10386 }
10387 
10388 
10389 int
10390 sctp_send_str_reset_req(struct sctp_tcb *stcb,
10391     int number_entries, uint16_t * list,
10392     uint8_t send_out_req, uint32_t resp_seq,
10393     uint8_t send_in_req,
10394     uint8_t send_tsn_req)
10395 {
10396 
10397         struct sctp_association *asoc;
10398         struct sctp_tmit_chunk *chk;
10399         struct sctp_chunkhdr *ch;
10400         uint32_t seq;
10401 
10402         asoc = &stcb->asoc;
10403         if (asoc->stream_reset_outstanding) {
10404                 /*-
10405                  * Already one pending, must get ACK back to clear the flag.
10406                  */
10407                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
10408                 return (EBUSY);
10409         }
10410         if ((send_out_req == 0) && (send_in_req == 0) && (send_tsn_req == 0)) {
10411                 /* nothing to do */
10412                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10413                 return (EINVAL);
10414         }
10415         if (send_tsn_req && (send_out_req || send_in_req)) {
10416                 /* error, can't do that */
10417                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10418                 return (EINVAL);
10419         }
10420         sctp_alloc_a_chunk(stcb, chk);
10421         if (chk == NULL) {
10422                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10423                 return (ENOMEM);
10424         }
10425         chk->copy_by_ref = 0;
10426         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
10427         chk->rec.chunk_id.can_take_data = 0;
10428         chk->asoc = &stcb->asoc;
10429         chk->book_size = sizeof(struct sctp_chunkhdr);
10430         chk->send_size = SCTP_SIZE32(chk->book_size);
10431         chk->book_size_scale = 0;
10432 
10433         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA);
10434         if (chk->data == NULL) {
10435                 sctp_free_a_chunk(stcb, chk);
10436                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10437                 return (ENOMEM);
10438         }
10439         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10440 
10441         /* setup chunk parameters */
10442         chk->sent = SCTP_DATAGRAM_UNSENT;
10443         chk->snd_count = 0;
10444         chk->whoTo = asoc->primary_destination;
10445         atomic_add_int(&chk->whoTo->ref_count, 1);
10446 
10447         ch = mtod(chk->data, struct sctp_chunkhdr *);
10448         ch->chunk_type = SCTP_STREAM_RESET;
10449         ch->chunk_flags = 0;
10450         ch->chunk_length = htons(chk->book_size);
10451         SCTP_BUF_LEN(chk->data) = chk->send_size;
10452 
10453         seq = stcb->asoc.str_reset_seq_out;
10454         if (send_out_req) {
10455                 sctp_add_stream_reset_out(chk, number_entries, list,
10456                     seq, resp_seq, (stcb->asoc.sending_seq - 1));
10457                 asoc->stream_reset_out_is_outstanding = 1;
10458                 seq++;
10459                 asoc->stream_reset_outstanding++;
10460         }
10461         if (send_in_req) {
10462                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
10463                 asoc->stream_reset_outstanding++;
10464         }
10465         if (send_tsn_req) {
10466                 sctp_add_stream_reset_tsn(chk, seq);
10467                 asoc->stream_reset_outstanding++;
10468         }
10469         asoc->str_reset = chk;
10470 
10471         /* insert the chunk for sending */
10472         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
10473             chk,
10474             sctp_next);
10475         asoc->ctrl_queue_cnt++;
10476         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
10477         return (0);
10478 }
10479 
10480 void
10481 sctp_send_abort(struct mbuf *m, int iphlen, struct sctphdr *sh, uint32_t vtag,
10482     struct mbuf *err_cause, uint32_t vrf_id)
10483 {
10484         /*-
10485          * Formulate the abort message, and send it back down.
10486          */
10487         struct mbuf *o_pak;
10488         struct mbuf *mout;
10489         struct sctp_abort_msg *abm;
10490         struct ip *iph, *iph_out;
10491         struct ip6_hdr *ip6, *ip6_out;
10492         int iphlen_out, len;
10493 
10494         /* don't respond to ABORT with ABORT */
10495         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
10496                 if (err_cause)
10497                         sctp_m_freem(err_cause);
10498                 return;
10499         }
10500         len = (sizeof(struct ip6_hdr) + sizeof(struct sctp_abort_msg));
10501 
10502         mout = sctp_get_mbuf_for_msg(len, 1, M_DONTWAIT, 1, MT_DATA);
10503         if (mout == NULL) {
10504                 if (err_cause)
10505                         sctp_m_freem(err_cause);
10506                 return;
10507         }
10508         iph = mtod(m, struct ip *);
10509         iph_out = NULL;
10510         ip6_out = NULL;
10511         if (iph->ip_v == IPVERSION) {
10512                 iph_out = mtod(mout, struct ip *);
10513                 SCTP_BUF_LEN(mout) = sizeof(*iph_out) + sizeof(*abm);
10514                 SCTP_BUF_NEXT(mout) = err_cause;
10515 
10516                 /* Fill in the IP header for the ABORT */
10517                 iph_out->ip_v = IPVERSION;
10518                 iph_out->ip_hl = (sizeof(struct ip) / 4);
10519                 iph_out->ip_tos = (u_char)0;
10520                 iph_out->ip_id = 0;
10521                 iph_out->ip_off = 0;
10522                 iph_out->ip_ttl = MAXTTL;
10523                 iph_out->ip_p = IPPROTO_SCTP;
10524                 iph_out->ip_src.s_addr = iph->ip_dst.s_addr;
10525                 iph_out->ip_dst.s_addr = iph->ip_src.s_addr;
10526                 /* let IP layer calculate this */
10527                 iph_out->ip_sum = 0;
10528 
10529                 iphlen_out = sizeof(*iph_out);
10530                 abm = (struct sctp_abort_msg *)((caddr_t)iph_out + iphlen_out);
10531         } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
10532                 ip6 = (struct ip6_hdr *)iph;
10533                 ip6_out = mtod(mout, struct ip6_hdr *);
10534                 SCTP_BUF_LEN(mout) = sizeof(*ip6_out) + sizeof(*abm);
10535                 SCTP_BUF_NEXT(mout) = err_cause;
10536 
10537                 /* Fill in the IP6 header for the ABORT */
10538                 ip6_out->ip6_flow = ip6->ip6_flow;
10539                 ip6_out->ip6_hlim = ip6_defhlim;
10540                 ip6_out->ip6_nxt = IPPROTO_SCTP;
10541                 ip6_out->ip6_src = ip6->ip6_dst;
10542                 ip6_out->ip6_dst = ip6->ip6_src;
10543 
10544                 iphlen_out = sizeof(*ip6_out);
10545                 abm = (struct sctp_abort_msg *)((caddr_t)ip6_out + iphlen_out);
10546         } else {
10547                 /* Currently not supported */
10548                 if (err_cause)
10549                         sctp_m_freem(err_cause);
10550                 sctp_m_freem(mout);
10551                 return;
10552         }
10553 
10554         abm->sh.src_port = sh->dest_port;
10555         abm->sh.dest_port = sh->src_port;
10556         abm->sh.checksum = 0;
10557         if (vtag == 0) {
10558                 abm->sh.v_tag = sh->v_tag;
10559                 abm->msg.ch.chunk_flags = SCTP_HAD_NO_TCB;
10560         } else {
10561                 abm->sh.v_tag = htonl(vtag);
10562                 abm->msg.ch.chunk_flags = 0;
10563         }
10564         abm->msg.ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10565 
10566         if (err_cause) {
10567                 struct mbuf *m_tmp = err_cause;
10568                 int err_len = 0;
10569 
10570                 /* get length of the err_cause chain */
10571                 while (m_tmp != NULL) {
10572                         err_len += SCTP_BUF_LEN(m_tmp);
10573                         m_tmp = SCTP_BUF_NEXT(m_tmp);
10574                 }
10575                 len = SCTP_BUF_LEN(mout) + err_len;
10576                 if (err_len % 4) {
10577                         /* need pad at end of chunk */
10578                         uint32_t cpthis = 0;
10579                         int padlen;
10580 
10581                         padlen = 4 - (len % 4);
10582                         m_copyback(mout, len, padlen, (caddr_t)&cpthis);
10583                         len += padlen;
10584                 }
10585                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch) + err_len);
10586         } else {
10587                 len = SCTP_BUF_LEN(mout);
10588                 abm->msg.ch.chunk_length = htons(sizeof(abm->msg.ch));
10589         }
10590 
10591         /* add checksum */
10592         abm->sh.checksum = sctp_calculate_sum(mout, NULL, iphlen_out);
10593         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10594                 /* no mbuf's */
10595                 sctp_m_freem(mout);
10596                 return;
10597         }
10598         if (iph_out != NULL) {
10599                 sctp_route_t ro;
10600                 struct sctp_tcb *stcb = NULL;
10601                 int ret;
10602 
10603                 /* zap the stack pointer to the route */
10604                 bzero(&ro, sizeof ro);
10605                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip_output:\n");
10606                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, iph_out, &abm->sh);
10607                 /* set IPv4 length */
10608                 iph_out->ip_len = len;
10609                 /* out it goes */
10610 #ifdef  SCTP_PACKET_LOGGING
10611                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10612                         sctp_packet_log(mout, len);
10613 #endif
10614                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10615                 SCTP_IP_OUTPUT(ret, o_pak, &ro, stcb, vrf_id);
10616 
10617                 /* Free the route if we got one back */
10618                 if (ro.ro_rt)
10619                         RTFREE(ro.ro_rt);
10620         } else if (ip6_out != NULL) {
10621                 struct route_in6 ro;
10622                 int ret;
10623                 struct sctp_tcb *stcb = NULL;
10624                 struct ifnet *ifp = NULL;
10625 
10626                 /* zap the stack pointer to the route */
10627                 bzero(&ro, sizeof(ro));
10628                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_send_abort calling ip6_output:\n");
10629                 SCTPDBG_PKT(SCTP_DEBUG_OUTPUT2, (struct ip *)ip6_out, &abm->sh);
10630                 ip6_out->ip6_plen = len - sizeof(*ip6_out);
10631 #ifdef  SCTP_PACKET_LOGGING
10632                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10633                         sctp_packet_log(mout, len);
10634 #endif
10635                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10636                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10637 
10638                 /* Free the route if we got one back */
10639                 if (ro.ro_rt)
10640                         RTFREE(ro.ro_rt);
10641         }
10642         SCTP_STAT_INCR(sctps_sendpackets);
10643         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10644 }
10645 
10646 void
10647 sctp_send_operr_to(struct mbuf *m, int iphlen, struct mbuf *scm, uint32_t vtag,
10648     uint32_t vrf_id)
10649 {
10650         struct mbuf *o_pak;
10651         struct sctphdr *ihdr;
10652         int retcode;
10653         struct sctphdr *ohdr;
10654         struct sctp_chunkhdr *ophdr;
10655         struct ip *iph;
10656         struct mbuf *mout;
10657 
10658 #ifdef SCTP_DEBUG
10659         struct sockaddr_in6 lsa6, fsa6;
10660 
10661 #endif
10662         uint32_t val;
10663         struct mbuf *at;
10664         int len;
10665 
10666         iph = mtod(m, struct ip *);
10667         ihdr = (struct sctphdr *)((caddr_t)iph + iphlen);
10668 
10669         SCTP_BUF_PREPEND(scm, (sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr)), M_DONTWAIT);
10670         if (scm == NULL) {
10671                 /* can't send because we can't add a mbuf */
10672                 return;
10673         }
10674         ohdr = mtod(scm, struct sctphdr *);
10675         ohdr->src_port = ihdr->dest_port;
10676         ohdr->dest_port = ihdr->src_port;
10677         ohdr->v_tag = vtag;
10678         ohdr->checksum = 0;
10679         ophdr = (struct sctp_chunkhdr *)(ohdr + 1);
10680         ophdr->chunk_type = SCTP_OPERATION_ERROR;
10681         ophdr->chunk_flags = 0;
10682         len = 0;
10683         at = scm;
10684         while (at) {
10685                 len += SCTP_BUF_LEN(at);
10686                 at = SCTP_BUF_NEXT(at);
10687         }
10688         ophdr->chunk_length = htons(len - sizeof(struct sctphdr));
10689         if (len % 4) {
10690                 /* need padding */
10691                 uint32_t cpthis = 0;
10692                 int padlen;
10693 
10694                 padlen = 4 - (len % 4);
10695                 m_copyback(scm, len, padlen, (caddr_t)&cpthis);
10696                 len += padlen;
10697         }
10698         val = sctp_calculate_sum(scm, NULL, 0);
10699         mout = sctp_get_mbuf_for_msg(sizeof(struct ip6_hdr), 1, M_DONTWAIT, 1, MT_DATA);
10700         if (mout == NULL) {
10701                 sctp_m_freem(scm);
10702                 return;
10703         }
10704         SCTP_BUF_NEXT(mout) = scm;
10705         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
10706                 sctp_m_freem(mout);
10707                 return;
10708         }
10709         ohdr->checksum = val;
10710         if (iph->ip_v == IPVERSION) {
10711                 /* V4 */
10712                 struct ip *out;
10713                 sctp_route_t ro;
10714                 struct sctp_tcb *stcb = NULL;
10715 
10716                 SCTP_BUF_LEN(mout) = sizeof(struct ip);
10717                 len += sizeof(struct ip);
10718 
10719                 bzero(&ro, sizeof ro);
10720                 out = mtod(mout, struct ip *);
10721                 out->ip_v = iph->ip_v;
10722                 out->ip_hl = (sizeof(struct ip) / 4);
10723                 out->ip_tos = iph->ip_tos;
10724                 out->ip_id = iph->ip_id;
10725                 out->ip_off = 0;
10726                 out->ip_ttl = MAXTTL;
10727                 out->ip_p = IPPROTO_SCTP;
10728                 out->ip_sum = 0;
10729                 out->ip_src = iph->ip_dst;
10730                 out->ip_dst = iph->ip_src;
10731                 out->ip_len = len;
10732 #ifdef  SCTP_PACKET_LOGGING
10733                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10734                         sctp_packet_log(mout, len);
10735 #endif
10736                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10737 
10738                 SCTP_IP_OUTPUT(retcode, o_pak, &ro, stcb, vrf_id);
10739 
10740                 SCTP_STAT_INCR(sctps_sendpackets);
10741                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10742                 /* Free the route if we got one back */
10743                 if (ro.ro_rt)
10744                         RTFREE(ro.ro_rt);
10745         } else {
10746                 /* V6 */
10747                 struct route_in6 ro;
10748                 int ret;
10749                 struct sctp_tcb *stcb = NULL;
10750                 struct ifnet *ifp = NULL;
10751                 struct ip6_hdr *out6, *in6;
10752 
10753                 SCTP_BUF_LEN(mout) = sizeof(struct ip6_hdr);
10754                 len += sizeof(struct ip6_hdr);
10755                 bzero(&ro, sizeof ro);
10756                 in6 = mtod(m, struct ip6_hdr *);
10757                 out6 = mtod(mout, struct ip6_hdr *);
10758                 out6->ip6_flow = in6->ip6_flow;
10759                 out6->ip6_hlim = ip6_defhlim;
10760                 out6->ip6_nxt = IPPROTO_SCTP;
10761                 out6->ip6_src = in6->ip6_dst;
10762                 out6->ip6_dst = in6->ip6_src;
10763                 out6->ip6_plen = len - sizeof(struct ip6_hdr);
10764 
10765 #ifdef SCTP_DEBUG
10766                 bzero(&lsa6, sizeof(lsa6));
10767                 lsa6.sin6_len = sizeof(lsa6);
10768                 lsa6.sin6_family = AF_INET6;
10769                 lsa6.sin6_addr = out6->ip6_src;
10770                 bzero(&fsa6, sizeof(fsa6));
10771                 fsa6.sin6_len = sizeof(fsa6);
10772                 fsa6.sin6_family = AF_INET6;
10773                 fsa6.sin6_addr = out6->ip6_dst;
10774 #endif
10775                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "sctp_operr_to calling ipv6 output:\n");
10776                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "src: ");
10777                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&lsa6);
10778                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "dst ");
10779                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&fsa6);
10780 
10781 #ifdef  SCTP_PACKET_LOGGING
10782                 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING)
10783                         sctp_packet_log(mout, len);
10784 #endif
10785                 SCTP_ATTACH_CHAIN(o_pak, mout, len);
10786                 SCTP_IP6_OUTPUT(ret, o_pak, &ro, &ifp, stcb, vrf_id);
10787 
10788                 SCTP_STAT_INCR(sctps_sendpackets);
10789                 SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
10790                 /* Free the route if we got one back */
10791                 if (ro.ro_rt)
10792                         RTFREE(ro.ro_rt);
10793         }
10794 }
10795 
10796 static struct mbuf *
10797 sctp_copy_resume(struct sctp_stream_queue_pending *sp,
10798     struct uio *uio,
10799     struct sctp_sndrcvinfo *srcv,
10800     int max_send_len,
10801     int user_marks_eor,
10802     int *error,
10803     uint32_t * sndout,
10804     struct mbuf **new_tail)
10805 {
10806         struct mbuf *m;
10807 
10808         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
10809             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
10810         if (m == NULL) {
10811                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10812                 *error = ENOMEM;
10813         } else {
10814                 *sndout = m_length(m, NULL);
10815                 *new_tail = m_last(m);
10816         }
10817         return (m);
10818 }
10819 
10820 static int
10821 sctp_copy_one(struct sctp_stream_queue_pending *sp,
10822     struct uio *uio,
10823     int resv_upfront)
10824 {
10825         int left;
10826 
10827         left = sp->length;
10828         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
10829             resv_upfront, 0);
10830         if (sp->data == NULL) {
10831                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10832                 return (ENOMEM);
10833         }
10834         sp->tail_mbuf = m_last(sp->data);
10835         return (0);
10836 }
10837 
10838 
10839 
10840 static struct sctp_stream_queue_pending *
10841 sctp_copy_it_in(struct sctp_tcb *stcb,
10842     struct sctp_association *asoc,
10843     struct sctp_sndrcvinfo *srcv,
10844     struct uio *uio,
10845     struct sctp_nets *net,
10846     int max_send_len,
10847     int user_marks_eor,
10848     int *error,
10849     int non_blocking)
10850 {
10851         /*-
10852          * This routine must be very careful in its work. Protocol
10853          * processing is up and running so care must be taken to spl...()
10854          * when you need to do something that may effect the stcb/asoc. The
10855          * sb is locked however. When data is copied the protocol processing
10856          * should be enabled since this is a slower operation...
10857          */
10858         struct sctp_stream_queue_pending *sp = NULL;
10859         int resv_in_first;
10860 
10861         *error = 0;
10862         /* Now can we send this? */
10863         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
10864             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
10865             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
10866             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
10867                 /* got data while shutting down */
10868                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
10869                 *error = ECONNRESET;
10870                 goto out_now;
10871         }
10872         sctp_alloc_a_strmoq(stcb, sp);
10873         if (sp == NULL) {
10874                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
10875                 *error = ENOMEM;
10876                 goto out_now;
10877         }
10878         sp->act_flags = 0;
10879         sp->sender_all_done = 0;
10880         sp->sinfo_flags = srcv->sinfo_flags;
10881         sp->timetolive = srcv->sinfo_timetolive;
10882         sp->ppid = srcv->sinfo_ppid;
10883         sp->context = srcv->sinfo_context;
10884         sp->strseq = 0;
10885         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
10886 
10887         sp->stream = srcv->sinfo_stream;
10888         sp->length = min(uio->uio_resid, max_send_len);
10889         if ((sp->length == (uint32_t) uio->uio_resid) &&
10890             ((user_marks_eor == 0) ||
10891             (srcv->sinfo_flags & SCTP_EOF) ||
10892             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
10893                 sp->msg_is_complete = 1;
10894         } else {
10895                 sp->msg_is_complete = 0;
10896         }
10897         sp->sender_all_done = 0;
10898         sp->some_taken = 0;
10899         sp->put_last_out = 0;
10900         resv_in_first = sizeof(struct sctp_data_chunk);
10901         sp->data = sp->tail_mbuf = NULL;
10902         *error = sctp_copy_one(sp, uio, resv_in_first);
10903         if (*error) {
10904                 sctp_free_a_strmoq(stcb, sp);
10905                 sp = NULL;
10906         } else {
10907                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
10908                         sp->net = net;
10909                         sp->addr_over = 1;
10910                 } else {
10911                         sp->net = asoc->primary_destination;
10912                         sp->addr_over = 0;
10913                 }
10914                 atomic_add_int(&sp->net->ref_count, 1);
10915                 sctp_set_prsctp_policy(stcb, sp);
10916         }
10917 out_now:
10918         return (sp);
10919 }
10920 
10921 
10922 int
10923 sctp_sosend(struct socket *so,
10924     struct sockaddr *addr,
10925     struct uio *uio,
10926     struct mbuf *top,
10927     struct mbuf *control,
10928     int flags,
10929     struct thread *p
10930 )
10931 {
10932         struct sctp_inpcb *inp;
10933         int error, use_rcvinfo = 0;
10934         struct sctp_sndrcvinfo srcv;
10935 
10936         inp = (struct sctp_inpcb *)so->so_pcb;
10937         if (control) {
10938                 /* process cmsg snd/rcv info (maybe a assoc-id) */
10939                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&srcv, control,
10940                     sizeof(srcv))) {
10941                         /* got one */
10942                         use_rcvinfo = 1;
10943                 }
10944         }
10945         error = sctp_lower_sosend(so, addr, uio, top,
10946             control,
10947             flags,
10948             use_rcvinfo, &srcv
10949             ,p
10950             );
10951         return (error);
10952 }
10953 
10954 
10955 int
10956 sctp_lower_sosend(struct socket *so,
10957     struct sockaddr *addr,
10958     struct uio *uio,
10959     struct mbuf *i_pak,
10960     struct mbuf *control,
10961     int flags,
10962     int use_rcvinfo,
10963     struct sctp_sndrcvinfo *srcv
10964     ,
10965     struct thread *p
10966 )
10967 {
10968         unsigned int sndlen = 0, max_len;
10969         int error, len;
10970         struct mbuf *top = NULL;
10971 
10972 #if defined(__NetBSD__) || defined(__OpenBSD_)
10973         int s;
10974 
10975 #endif
10976         int queue_only = 0, queue_only_for_init = 0;
10977         int free_cnt_applied = 0;
10978         int un_sent = 0;
10979         int now_filled = 0;
10980         unsigned int inqueue_bytes = 0;
10981         struct sctp_block_entry be;
10982         struct sctp_inpcb *inp;
10983         struct sctp_tcb *stcb = NULL;
10984         struct timeval now;
10985         struct sctp_nets *net;
10986         struct sctp_association *asoc;
10987         struct sctp_inpcb *t_inp;
10988         int user_marks_eor;
10989         int create_lock_applied = 0;
10990         int nagle_applies = 0;
10991         int some_on_control = 0;
10992         int got_all_of_the_send = 0;
10993         int hold_tcblock = 0;
10994         int non_blocking = 0;
10995         int temp_flags = 0;
10996         uint32_t local_add_more, local_soresv = 0;
10997 
10998         error = 0;
10999         net = NULL;
11000         stcb = NULL;
11001         asoc = NULL;
11002 
11003         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
11004         if (inp == NULL) {
11005                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11006                 error = EFAULT;
11007                 if (i_pak) {
11008                         SCTP_RELEASE_PKT(i_pak);
11009                 }
11010                 return (error);
11011         }
11012         if ((uio == NULL) && (i_pak == NULL)) {
11013                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11014                 return (EINVAL);
11015         }
11016         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
11017         atomic_add_int(&inp->total_sends, 1);
11018         if (uio) {
11019                 if (uio->uio_resid < 0) {
11020                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11021                         return (EINVAL);
11022                 }
11023                 sndlen = uio->uio_resid;
11024         } else {
11025                 top = SCTP_HEADER_TO_CHAIN(i_pak);
11026                 sndlen = SCTP_HEADER_LEN(i_pak);
11027         }
11028         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
11029             addr,
11030             sndlen);
11031         /*-
11032          * Pre-screen address, if one is given the sin-len
11033          * must be set correctly!
11034          */
11035         if (addr) {
11036                 if ((addr->sa_family == AF_INET) &&
11037                     (addr->sa_len != sizeof(struct sockaddr_in))) {
11038                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11039                         error = EINVAL;
11040                         goto out_unlocked;
11041                 } else if ((addr->sa_family == AF_INET6) &&
11042                     (addr->sa_len != sizeof(struct sockaddr_in6))) {
11043                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11044                         error = EINVAL;
11045                         goto out_unlocked;
11046                 }
11047         }
11048         hold_tcblock = 0;
11049 
11050         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
11051             (inp->sctp_socket->so_qlimit)) {
11052                 /* The listener can NOT send */
11053                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11054                 error = EFAULT;
11055                 goto out_unlocked;
11056         }
11057         if ((use_rcvinfo) && srcv) {
11058                 if (INVALID_SINFO_FLAG(srcv->sinfo_flags) ||
11059                     PR_SCTP_INVALID_POLICY(srcv->sinfo_flags)) {
11060                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11061                         error = EINVAL;
11062                         goto out_unlocked;
11063                 }
11064                 if (srcv->sinfo_flags)
11065                         SCTP_STAT_INCR(sctps_sends_with_flags);
11066 
11067                 if (srcv->sinfo_flags & SCTP_SENDALL) {
11068                         /* its a sendall */
11069                         error = sctp_sendall(inp, uio, top, srcv);
11070                         top = NULL;
11071                         goto out_unlocked;
11072                 }
11073         }
11074         /* now we must find the assoc */
11075         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
11076             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
11077                 SCTP_INP_RLOCK(inp);
11078                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
11079                 if (stcb == NULL) {
11080                         SCTP_INP_RUNLOCK(inp);
11081                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11082                         error = ENOTCONN;
11083                         goto out_unlocked;
11084                 }
11085                 hold_tcblock = 0;
11086                 SCTP_INP_RUNLOCK(inp);
11087                 if (addr) {
11088                         /* Must locate the net structure if addr given */
11089                         net = sctp_findnet(stcb, addr);
11090                         if (net) {
11091                                 /* validate port was 0 or correct */
11092                                 struct sockaddr_in *sin;
11093 
11094                                 sin = (struct sockaddr_in *)addr;
11095                                 if ((sin->sin_port != 0) &&
11096                                     (sin->sin_port != stcb->rport)) {
11097                                         net = NULL;
11098                                 }
11099                         }
11100                         temp_flags |= SCTP_ADDR_OVER;
11101                 } else
11102                         net = stcb->asoc.primary_destination;
11103                 if (addr && (net == NULL)) {
11104                         /* Could not find address, was it legal */
11105                         if (addr->sa_family == AF_INET) {
11106                                 struct sockaddr_in *sin;
11107 
11108                                 sin = (struct sockaddr_in *)addr;
11109                                 if (sin->sin_addr.s_addr == 0) {
11110                                         if ((sin->sin_port == 0) ||
11111                                             (sin->sin_port == stcb->rport)) {
11112                                                 net = stcb->asoc.primary_destination;
11113                                         }
11114                                 }
11115                         } else {
11116                                 struct sockaddr_in6 *sin6;
11117 
11118                                 sin6 = (struct sockaddr_in6 *)addr;
11119                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
11120                                         if ((sin6->sin6_port == 0) ||
11121                                             (sin6->sin6_port == stcb->rport)) {
11122                                                 net = stcb->asoc.primary_destination;
11123                                         }
11124                                 }
11125                         }
11126                 }
11127                 if (net == NULL) {
11128                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11129                         error = EINVAL;
11130                         goto out_unlocked;
11131                 }
11132         } else if (use_rcvinfo && srcv && srcv->sinfo_assoc_id) {
11133                 stcb = sctp_findassociation_ep_asocid(inp, srcv->sinfo_assoc_id, 0);
11134                 if (stcb) {
11135                         if (addr)
11136                                 /*
11137                                  * Must locate the net structure if addr
11138                                  * given
11139                                  */
11140                                 net = sctp_findnet(stcb, addr);
11141                         else
11142                                 net = stcb->asoc.primary_destination;
11143                         if ((srcv->sinfo_flags & SCTP_ADDR_OVER) &&
11144                             ((net == NULL) || (addr == NULL))) {
11145                                 struct sockaddr_in *sin;
11146 
11147                                 if (addr == NULL) {
11148                                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11149                                         error = EINVAL;
11150                                         goto out_unlocked;
11151                                 }
11152                                 sin = (struct sockaddr_in *)addr;
11153                                 /* Validate port is 0 or correct */
11154                                 if ((sin->sin_port != 0) &&
11155                                     (sin->sin_port != stcb->rport)) {
11156                                         net = NULL;
11157                                 }
11158                         }
11159                 }
11160                 hold_tcblock = 0;
11161         } else if (addr) {
11162                 /*-
11163                  * Since we did not use findep we must
11164                  * increment it, and if we don't find a tcb
11165                  * decrement it.
11166                  */
11167                 SCTP_INP_WLOCK(inp);
11168                 SCTP_INP_INCR_REF(inp);
11169                 SCTP_INP_WUNLOCK(inp);
11170                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11171                 if (stcb == NULL) {
11172                         SCTP_INP_WLOCK(inp);
11173                         SCTP_INP_DECR_REF(inp);
11174                         SCTP_INP_WUNLOCK(inp);
11175                 } else {
11176                         hold_tcblock = 1;
11177                 }
11178         }
11179         if ((stcb == NULL) && (addr)) {
11180                 /* Possible implicit send? */
11181                 SCTP_ASOC_CREATE_LOCK(inp);
11182                 create_lock_applied = 1;
11183                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
11184                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
11185                         /* Should I really unlock ? */
11186                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11187                         error = EFAULT;
11188                         goto out_unlocked;
11189 
11190                 }
11191                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
11192                     (addr->sa_family == AF_INET6)) {
11193                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11194                         error = EINVAL;
11195                         goto out_unlocked;
11196                 }
11197                 SCTP_INP_WLOCK(inp);
11198                 SCTP_INP_INCR_REF(inp);
11199                 SCTP_INP_WUNLOCK(inp);
11200                 /* With the lock applied look again */
11201                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
11202                 if (stcb == NULL) {
11203                         SCTP_INP_WLOCK(inp);
11204                         SCTP_INP_DECR_REF(inp);
11205                         SCTP_INP_WUNLOCK(inp);
11206                 } else {
11207                         hold_tcblock = 1;
11208                 }
11209                 if (t_inp != inp) {
11210                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
11211                         error = ENOTCONN;
11212                         goto out_unlocked;
11213                 }
11214         }
11215         if (stcb == NULL) {
11216                 if (addr == NULL) {
11217                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11218                         error = ENOENT;
11219                         goto out_unlocked;
11220                 } else {
11221                         /*
11222                          * UDP style, we must go ahead and start the INIT
11223                          * process
11224                          */
11225                         uint32_t vrf_id;
11226 
11227                         if ((use_rcvinfo) && (srcv) &&
11228                             ((srcv->sinfo_flags & SCTP_ABORT) ||
11229                             ((srcv->sinfo_flags & SCTP_EOF) &&
11230                             (sndlen == 0)))) {
11231                                 /*-
11232                                  * User asks to abort a non-existant assoc,
11233                                  * or EOF a non-existant assoc with no data
11234                                  */
11235                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
11236                                 error = ENOENT;
11237                                 goto out_unlocked;
11238                         }
11239                         /* get an asoc/stcb struct */
11240                         vrf_id = inp->def_vrf_id;
11241 #ifdef INVARIANTS
11242                         if (create_lock_applied == 0) {
11243                                 panic("Error, should hold create lock and I don't?");
11244                         }
11245 #endif
11246                         stcb = sctp_aloc_assoc(inp, addr, 1, &error, 0, vrf_id,
11247                             p
11248                             );
11249                         if (stcb == NULL) {
11250                                 /* Error is setup for us in the call */
11251                                 goto out_unlocked;
11252                         }
11253                         if (create_lock_applied) {
11254                                 SCTP_ASOC_CREATE_UNLOCK(inp);
11255                                 create_lock_applied = 0;
11256                         } else {
11257                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
11258                         }
11259                         /*
11260                          * Turn on queue only flag to prevent data from
11261                          * being sent
11262                          */
11263                         queue_only = 1;
11264                         asoc = &stcb->asoc;
11265                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11266                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
11267 
11268                         /* initialize authentication params for the assoc */
11269                         sctp_initialize_auth_params(inp, stcb);
11270 
11271                         if (control) {
11272                                 /*
11273                                  * see if a init structure exists in cmsg
11274                                  * headers
11275                                  */
11276                                 struct sctp_initmsg initm;
11277                                 int i;
11278 
11279                                 if (sctp_find_cmsg(SCTP_INIT, (void *)&initm, control,
11280                                     sizeof(initm))) {
11281                                         /*
11282                                          * we have an INIT override of the
11283                                          * default
11284                                          */
11285                                         if (initm.sinit_max_attempts)
11286                                                 asoc->max_init_times = initm.sinit_max_attempts;
11287                                         if (initm.sinit_num_ostreams)
11288                                                 asoc->pre_open_streams = initm.sinit_num_ostreams;
11289                                         if (initm.sinit_max_instreams)
11290                                                 asoc->max_inbound_streams = initm.sinit_max_instreams;
11291                                         if (initm.sinit_max_init_timeo)
11292                                                 asoc->initial_init_rto_max = initm.sinit_max_init_timeo;
11293                                         if (asoc->streamoutcnt < asoc->pre_open_streams) {
11294                                                 /* Default is NOT correct */
11295                                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, defout:%d pre_open:%d\n",
11296                                                     asoc->streamoutcnt, asoc->pre_open_streams);
11297                                                 /*
11298                                                  * What happens if this
11299                                                  * fails? we panic ...
11300                                                  */
11301                                                 {
11302                                                         struct sctp_stream_out *tmp_str;
11303                                                         int had_lock = 0;
11304 
11305                                                         if (hold_tcblock) {
11306                                                                 had_lock = 1;
11307                                                                 SCTP_TCB_UNLOCK(stcb);
11308                                                         }
11309                                                         SCTP_MALLOC(tmp_str,
11310                                                             struct sctp_stream_out *,
11311                                                             (asoc->pre_open_streams *
11312                                                             sizeof(struct sctp_stream_out)),
11313                                                             SCTP_M_STRMO);
11314                                                         if (had_lock) {
11315                                                                 SCTP_TCB_LOCK(stcb);
11316                                                         }
11317                                                         if (tmp_str != NULL) {
11318                                                                 SCTP_FREE(asoc->strmout, SCTP_M_STRMO);
11319                                                                 asoc->strmout = tmp_str;
11320                                                                 asoc->streamoutcnt = asoc->pre_open_streams;
11321                                                         } else {
11322                                                                 asoc->pre_open_streams = asoc->streamoutcnt;
11323                                                         }
11324                                                 }
11325                                                 for (i = 0; i < asoc->streamoutcnt; i++) {
11326                                                         /*-
11327                                                          * inbound side must be set
11328                                                          * to 0xffff, also NOTE when
11329                                                          * we get the INIT-ACK back
11330                                                          * (for INIT sender) we MUST
11331                                                          * reduce the count
11332                                                          * (streamoutcnt) but first
11333                                                          * check if we sent to any
11334                                                          * of the upper streams that
11335                                                          * were dropped (if some
11336                                                          * were). Those that were
11337                                                          * dropped must be notified
11338                                                          * to the upper layer as
11339                                                          * failed to send.
11340                                                          */
11341                                                         asoc->strmout[i].next_sequence_sent = 0x0;
11342                                                         TAILQ_INIT(&asoc->strmout[i].outqueue);
11343                                                         asoc->strmout[i].stream_no = i;
11344                                                         asoc->strmout[i].last_msg_incomplete = 0;
11345                                                         asoc->strmout[i].next_spoke.tqe_next = 0;
11346                                                         asoc->strmout[i].next_spoke.tqe_prev = 0;
11347                                                 }
11348                                         }
11349                                 }
11350                         }
11351                         hold_tcblock = 1;
11352                         /* out with the INIT */
11353                         queue_only_for_init = 1;
11354                         /*-
11355                          * we may want to dig in after this call and adjust the MTU
11356                          * value. It defaulted to 1500 (constant) but the ro
11357                          * structure may now have an update and thus we may need to
11358                          * change it BEFORE we append the message.
11359                          */
11360                         net = stcb->asoc.primary_destination;
11361                         asoc = &stcb->asoc;
11362                 }
11363         }
11364         if ((SCTP_SO_IS_NBIO(so)
11365             || (flags & MSG_NBIO)
11366             )) {
11367                 non_blocking = 1;
11368         }
11369         asoc = &stcb->asoc;
11370 
11371         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
11372                 if (sndlen > asoc->smallest_mtu) {
11373                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11374                         error = EMSGSIZE;
11375                         goto out_unlocked;
11376                 }
11377         }
11378         /* would we block? */
11379         if (non_blocking) {
11380                 if (hold_tcblock == 0) {
11381                         SCTP_TCB_LOCK(stcb);
11382                         hold_tcblock = 1;
11383                 }
11384                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11385                 if ((SCTP_SB_LIMIT_SND(so) <
11386                     (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
11387                     (stcb->asoc.chunks_on_out_queue >
11388                     sctp_max_chunks_on_queue)) {
11389                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
11390                         if (sndlen > SCTP_SB_LIMIT_SND(so))
11391                                 error = EMSGSIZE;
11392                         else
11393                                 error = EWOULDBLOCK;
11394                         goto out_unlocked;
11395                 }
11396                 stcb->asoc.sb_send_resv += sndlen;
11397                 SCTP_TCB_UNLOCK(stcb);
11398                 hold_tcblock = 0;
11399         } else {
11400                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
11401         }
11402         local_soresv = sndlen;
11403         /* Keep the stcb from being freed under our feet */
11404         if (free_cnt_applied) {
11405 #ifdef INVARIANTS
11406                 panic("refcnt already incremented");
11407 #else
11408                 printf("refcnt:1 already incremented?\n");
11409 #endif
11410         } else {
11411                 atomic_add_int(&stcb->asoc.refcnt, 1);
11412                 free_cnt_applied = 1;
11413         }
11414         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11415                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11416                 error = ECONNRESET;
11417                 goto out_unlocked;
11418         }
11419         if (create_lock_applied) {
11420                 SCTP_ASOC_CREATE_UNLOCK(inp);
11421                 create_lock_applied = 0;
11422         }
11423         if (asoc->stream_reset_outstanding) {
11424                 /*
11425                  * Can't queue any data while stream reset is underway.
11426                  */
11427                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAGAIN);
11428                 error = EAGAIN;
11429                 goto out_unlocked;
11430         }
11431         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11432             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11433                 queue_only = 1;
11434         }
11435         if ((use_rcvinfo == 0) || (srcv == NULL)) {
11436                 /* Grab the default stuff from the asoc */
11437                 srcv = (struct sctp_sndrcvinfo *)&stcb->asoc.def_send;
11438         }
11439         /* we are now done with all control */
11440         if (control) {
11441                 sctp_m_freem(control);
11442                 control = NULL;
11443         }
11444         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
11445             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
11446             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
11447             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
11448                 if ((use_rcvinfo) &&
11449                     (srcv->sinfo_flags & SCTP_ABORT)) {
11450                         ;
11451                 } else {
11452                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11453                         error = ECONNRESET;
11454                         goto out_unlocked;
11455                 }
11456         }
11457         /* Ok, we will attempt a msgsnd :> */
11458         if (p) {
11459                 p->td_ru.ru_msgsnd++;
11460         }
11461         if (stcb) {
11462                 if (((srcv->sinfo_flags | temp_flags) & SCTP_ADDR_OVER) == 0) {
11463                         net = stcb->asoc.primary_destination;
11464                 }
11465         }
11466         if (net == NULL) {
11467                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11468                 error = EINVAL;
11469                 goto out_unlocked;
11470         }
11471         if ((net->flight_size > net->cwnd) && (sctp_cmt_on_off == 0)) {
11472                 /*-
11473                  * CMT: Added check for CMT above. net above is the primary
11474                  * dest. If CMT is ON, sender should always attempt to send
11475                  * with the output routine sctp_fill_outqueue() that loops
11476                  * through all destination addresses. Therefore, if CMT is
11477                  * ON, queue_only is NOT set to 1 here, so that
11478                  * sctp_chunk_output() can be called below.
11479                  */
11480                 queue_only = 1;
11481 
11482         } else if (asoc->ifp_had_enobuf) {
11483                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11484                 if (net->flight_size > (net->mtu * 2))
11485                         queue_only = 1;
11486                 asoc->ifp_had_enobuf = 0;
11487         } else {
11488                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11489                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) * sizeof(struct sctp_data_chunk)));
11490         }
11491         /* Are we aborting? */
11492         if (srcv->sinfo_flags & SCTP_ABORT) {
11493                 struct mbuf *mm;
11494                 int tot_demand, tot_out = 0, max_out;
11495 
11496                 SCTP_STAT_INCR(sctps_sends_with_abort);
11497                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
11498                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
11499                         /* It has to be up before we abort */
11500                         /* how big is the user initiated abort? */
11501                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11502                         error = EINVAL;
11503                         goto out;
11504                 }
11505                 if (hold_tcblock) {
11506                         SCTP_TCB_UNLOCK(stcb);
11507                         hold_tcblock = 0;
11508                 }
11509                 if (top) {
11510                         struct mbuf *cntm = NULL;
11511 
11512                         mm = sctp_get_mbuf_for_msg(1, 0, M_WAIT, 1, MT_DATA);
11513                         if (sndlen != 0) {
11514                                 cntm = top;
11515                                 while (cntm) {
11516                                         tot_out += SCTP_BUF_LEN(cntm);
11517                                         cntm = SCTP_BUF_NEXT(cntm);
11518                                 }
11519                         }
11520                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11521                 } else {
11522                         /* Must fit in a MTU */
11523                         tot_out = sndlen;
11524                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
11525                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
11526                                 /* To big */
11527                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11528                                 error = EMSGSIZE;
11529                                 goto out;
11530                         }
11531                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAIT, 1, MT_DATA);
11532                 }
11533                 if (mm == NULL) {
11534                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11535                         error = ENOMEM;
11536                         goto out;
11537                 }
11538                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
11539                 max_out -= sizeof(struct sctp_abort_msg);
11540                 if (tot_out > max_out) {
11541                         tot_out = max_out;
11542                 }
11543                 if (mm) {
11544                         struct sctp_paramhdr *ph;
11545 
11546                         /* now move forward the data pointer */
11547                         ph = mtod(mm, struct sctp_paramhdr *);
11548                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
11549                         ph->param_length = htons((sizeof(struct sctp_paramhdr) + tot_out));
11550                         ph++;
11551                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
11552                         if (top == NULL) {
11553                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
11554                                 if (error) {
11555                                         /*-
11556                                          * Here if we can't get his data we
11557                                          * still abort we just don't get to
11558                                          * send the users note :-0
11559                                          */
11560                                         sctp_m_freem(mm);
11561                                         mm = NULL;
11562                                 }
11563                         } else {
11564                                 if (sndlen != 0) {
11565                                         SCTP_BUF_NEXT(mm) = top;
11566                                 }
11567                         }
11568                 }
11569                 if (hold_tcblock == 0) {
11570                         SCTP_TCB_LOCK(stcb);
11571                         hold_tcblock = 1;
11572                 }
11573                 atomic_add_int(&stcb->asoc.refcnt, -1);
11574                 free_cnt_applied = 0;
11575                 /* release this lock, otherwise we hang on ourselves */
11576                 sctp_abort_an_association(stcb->sctp_ep, stcb,
11577                     SCTP_RESPONSE_TO_USER_REQ,
11578                     mm, SCTP_SO_LOCKED);
11579                 /* now relock the stcb so everything is sane */
11580                 hold_tcblock = 0;
11581                 stcb = NULL;
11582                 /*
11583                  * In this case top is already chained to mm avoid double
11584                  * free, since we free it below if top != NULL and driver
11585                  * would free it after sending the packet out
11586                  */
11587                 if (sndlen != 0) {
11588                         top = NULL;
11589                 }
11590                 goto out_unlocked;
11591         }
11592         /* Calculate the maximum we can send */
11593         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11594         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11595                 if (non_blocking) {
11596                         /* we already checked for non-blocking above. */
11597                         max_len = sndlen;
11598                 } else {
11599                         max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11600                 }
11601         } else {
11602                 max_len = 0;
11603         }
11604         if (hold_tcblock) {
11605                 SCTP_TCB_UNLOCK(stcb);
11606                 hold_tcblock = 0;
11607         }
11608         /* Is the stream no. valid? */
11609         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
11610                 /* Invalid stream number */
11611                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11612                 error = EINVAL;
11613                 goto out_unlocked;
11614         }
11615         if (asoc->strmout == NULL) {
11616                 /* huh? software error */
11617                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11618                 error = EFAULT;
11619                 goto out_unlocked;
11620         }
11621         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
11622         if ((user_marks_eor == 0) &&
11623             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
11624                 /* It will NEVER fit */
11625                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
11626                 error = EMSGSIZE;
11627                 goto out_unlocked;
11628         }
11629         if ((uio == NULL) && user_marks_eor) {
11630                 /*-
11631                  * We do not support eeor mode for
11632                  * sending with mbuf chains (like sendfile).
11633                  */
11634                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11635                 error = EINVAL;
11636                 goto out_unlocked;
11637         }
11638         if (user_marks_eor) {
11639                 local_add_more = sctp_add_more_threshold;
11640         } else {
11641                 /*-
11642                  * For non-eeor the whole message must fit in
11643                  * the socket send buffer.
11644                  */
11645                 local_add_more = sndlen;
11646         }
11647         len = 0;
11648         if (non_blocking) {
11649                 goto skip_preblock;
11650         }
11651         if (((max_len <= local_add_more) &&
11652             (SCTP_SB_LIMIT_SND(so) > local_add_more)) ||
11653             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) > sctp_max_chunks_on_queue)) {      /* if */
11654                 /* No room right no ! */
11655                 SOCKBUF_LOCK(&so->so_snd);
11656                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11657                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + sctp_add_more_threshold)) ||
11658                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) > sctp_max_chunks_on_queue /* while */ )) {
11659 
11660                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11661                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA,
11662                                     so, asoc, sndlen);
11663                         }
11664                         be.error = 0;
11665                         stcb->block_entry = &be;
11666                         error = sbwait(&so->so_snd);
11667                         stcb->block_entry = NULL;
11668                         if (error || so->so_error || be.error) {
11669                                 if (error == 0) {
11670                                         if (so->so_error)
11671                                                 error = so->so_error;
11672                                         if (be.error) {
11673                                                 error = be.error;
11674                                         }
11675                                 }
11676                                 SOCKBUF_UNLOCK(&so->so_snd);
11677                                 goto out_unlocked;
11678                         }
11679                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11680                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
11681                                     so, asoc, stcb->asoc.total_output_queue_size);
11682                         }
11683                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11684                                 goto out_unlocked;
11685                         }
11686                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11687                 }
11688                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11689                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
11690                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11691                 } else {
11692                         max_len = 0;
11693                 }
11694                 SOCKBUF_UNLOCK(&so->so_snd);
11695         }
11696 skip_preblock:
11697         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11698                 goto out_unlocked;
11699         }
11700         atomic_add_int(&stcb->total_sends, 1);
11701         /*
11702          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
11703          * case NOTE: uio will be null when top/mbuf is passed
11704          */
11705         if (sndlen == 0) {
11706                 if (srcv->sinfo_flags & SCTP_EOF) {
11707                         got_all_of_the_send = 1;
11708                         goto dataless_eof;
11709                 } else {
11710                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11711                         error = EINVAL;
11712                         goto out;
11713                 }
11714         }
11715         if (top == NULL) {
11716                 struct sctp_stream_queue_pending *sp;
11717                 struct sctp_stream_out *strm;
11718                 uint32_t sndout, initial_out;
11719 
11720                 initial_out = uio->uio_resid;
11721 
11722                 SCTP_TCB_SEND_LOCK(stcb);
11723                 if ((asoc->stream_locked) &&
11724                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
11725                         SCTP_TCB_SEND_UNLOCK(stcb);
11726                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
11727                         error = EINVAL;
11728                         goto out;
11729                 }
11730                 SCTP_TCB_SEND_UNLOCK(stcb);
11731 
11732                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
11733                 if (strm->last_msg_incomplete == 0) {
11734         do_a_copy_in:
11735                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error, non_blocking);
11736                         if ((sp == NULL) || (error)) {
11737                                 goto out;
11738                         }
11739                         SCTP_TCB_SEND_LOCK(stcb);
11740                         if (sp->msg_is_complete) {
11741                                 strm->last_msg_incomplete = 0;
11742                                 asoc->stream_locked = 0;
11743                         } else {
11744                                 /*
11745                                  * Just got locked to this guy in case of an
11746                                  * interrupt.
11747                                  */
11748                                 strm->last_msg_incomplete = 1;
11749                                 asoc->stream_locked = 1;
11750                                 asoc->stream_locked_on = srcv->sinfo_stream;
11751                                 sp->sender_all_done = 0;
11752                         }
11753                         sctp_snd_sb_alloc(stcb, sp->length);
11754                         atomic_add_int(&asoc->stream_queue_cnt, 1);
11755                         if ((srcv->sinfo_flags & SCTP_UNORDERED) == 0) {
11756                                 sp->strseq = strm->next_sequence_sent;
11757                                 if (sctp_logging_level & SCTP_LOG_AT_SEND_2_SCTP) {
11758                                         sctp_misc_ints(SCTP_STRMOUT_LOG_ASSIGN,
11759                                             (uintptr_t) stcb, sp->length,
11760                                             (uint32_t) ((srcv->sinfo_stream << 16) | sp->strseq), 0);
11761                                 }
11762                                 strm->next_sequence_sent++;
11763                         } else {
11764                                 SCTP_STAT_INCR(sctps_sends_with_unord);
11765                         }
11766                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
11767                         if ((strm->next_spoke.tqe_next == NULL) &&
11768                             (strm->next_spoke.tqe_prev == NULL)) {
11769                                 /* Not on wheel, insert */
11770                                 sctp_insert_on_wheel(stcb, asoc, strm, 1);
11771                         }
11772                         SCTP_TCB_SEND_UNLOCK(stcb);
11773                 } else {
11774                         SCTP_TCB_SEND_LOCK(stcb);
11775                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
11776                         SCTP_TCB_SEND_UNLOCK(stcb);
11777                         if (sp == NULL) {
11778                                 /* ???? Huh ??? last msg is gone */
11779 #ifdef INVARIANTS
11780                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
11781 #else
11782                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
11783                                 strm->last_msg_incomplete = 0;
11784 #endif
11785                                 goto do_a_copy_in;
11786 
11787                         }
11788                 }
11789                 while (uio->uio_resid > 0) {
11790                         /* How much room do we have? */
11791                         struct mbuf *new_tail, *mm;
11792 
11793                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11794                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
11795                         else
11796                                 max_len = 0;
11797 
11798                         if ((max_len > sctp_add_more_threshold) ||
11799                             (max_len && (SCTP_SB_LIMIT_SND(so) < sctp_add_more_threshold)) ||
11800                             (uio->uio_resid &&
11801                             (uio->uio_resid <= (int)max_len))) {
11802                                 sndout = 0;
11803                                 new_tail = NULL;
11804                                 if (hold_tcblock) {
11805                                         SCTP_TCB_UNLOCK(stcb);
11806                                         hold_tcblock = 0;
11807                                 }
11808                                 mm = sctp_copy_resume(sp, uio, srcv, max_len, user_marks_eor, &error, &sndout, &new_tail);
11809                                 if ((mm == NULL) || error) {
11810                                         if (mm) {
11811                                                 sctp_m_freem(mm);
11812                                         }
11813                                         goto out;
11814                                 }
11815                                 /* Update the mbuf and count */
11816                                 SCTP_TCB_SEND_LOCK(stcb);
11817                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
11818                                         /*
11819                                          * we need to get out. Peer probably
11820                                          * aborted.
11821                                          */
11822                                         sctp_m_freem(mm);
11823                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
11824                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
11825                                                 error = ECONNRESET;
11826                                         }
11827                                         SCTP_TCB_SEND_UNLOCK(stcb);
11828                                         goto out;
11829                                 }
11830                                 if (sp->tail_mbuf) {
11831                                         /* tack it to the end */
11832                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
11833                                         sp->tail_mbuf = new_tail;
11834                                 } else {
11835                                         /* A stolen mbuf */
11836                                         sp->data = mm;
11837                                         sp->tail_mbuf = new_tail;
11838                                 }
11839                                 sctp_snd_sb_alloc(stcb, sndout);
11840                                 atomic_add_int(&sp->length, sndout);
11841                                 len += sndout;
11842 
11843                                 /* Did we reach EOR? */
11844                                 if ((uio->uio_resid == 0) &&
11845                                     ((user_marks_eor == 0) ||
11846                                     (srcv->sinfo_flags & SCTP_EOF) ||
11847                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))
11848                                     ) {
11849                                         sp->msg_is_complete = 1;
11850                                 } else {
11851                                         sp->msg_is_complete = 0;
11852                                 }
11853                                 SCTP_TCB_SEND_UNLOCK(stcb);
11854                         }
11855                         if (uio->uio_resid == 0) {
11856                                 /* got it all? */
11857                                 continue;
11858                         }
11859                         /* PR-SCTP? */
11860                         if ((asoc->peer_supports_prsctp) && (asoc->sent_queue_cnt_removeable > 0)) {
11861                                 /*
11862                                  * This is ugly but we must assure locking
11863                                  * order
11864                                  */
11865                                 if (hold_tcblock == 0) {
11866                                         SCTP_TCB_LOCK(stcb);
11867                                         hold_tcblock = 1;
11868                                 }
11869                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
11870                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
11871                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
11872                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
11873                                 else
11874                                         max_len = 0;
11875                                 if (max_len > 0) {
11876                                         continue;
11877                                 }
11878                                 SCTP_TCB_UNLOCK(stcb);
11879                                 hold_tcblock = 0;
11880                         }
11881                         /* wait for space now */
11882                         if (non_blocking) {
11883                                 /* Non-blocking io in place out */
11884                                 goto skip_out_eof;
11885                         }
11886                         if ((net->flight_size > net->cwnd) &&
11887                             (sctp_cmt_on_off == 0)) {
11888                                 queue_only = 1;
11889                         } else if (asoc->ifp_had_enobuf) {
11890                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
11891                                 if (net->flight_size > (net->mtu * 2)) {
11892                                         queue_only = 1;
11893                                 } else {
11894                                         queue_only = 0;
11895                                 }
11896                                 asoc->ifp_had_enobuf = 0;
11897                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11898                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11899                                     sizeof(struct sctp_data_chunk)));
11900                         } else {
11901                                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
11902                                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
11903                                     sizeof(struct sctp_data_chunk)));
11904                                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
11905                                         queue_only = 1;
11906                                         SCTP_STAT_INCR(sctps_send_burst_avoid);
11907                                 } else if (net->flight_size > net->cwnd) {
11908                                         queue_only = 1;
11909                                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
11910                                 } else {
11911                                         queue_only = 0;
11912                                 }
11913                         }
11914                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
11915                             (stcb->asoc.total_flight > 0) &&
11916                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
11917                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
11918                             ) {
11919 
11920                                 /*-
11921                                  * Ok, Nagle is set on and we have data outstanding.
11922                                  * Don't send anything and let SACKs drive out the
11923                                  * data unless wen have a "full" segment to send.
11924                                  */
11925                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11926                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
11927                                 }
11928                                 SCTP_STAT_INCR(sctps_naglequeued);
11929                                 nagle_applies = 1;
11930                         } else {
11931                                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
11932                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
11933                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
11934                                 }
11935                                 SCTP_STAT_INCR(sctps_naglesent);
11936                                 nagle_applies = 0;
11937                         }
11938                         /* What about the INIT, send it maybe */
11939                         if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
11940 
11941                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
11942                                     nagle_applies, un_sent);
11943                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
11944                                     stcb->asoc.total_flight,
11945                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
11946                         }
11947                         if (queue_only_for_init) {
11948                                 if (hold_tcblock == 0) {
11949                                         SCTP_TCB_LOCK(stcb);
11950                                         hold_tcblock = 1;
11951                                 }
11952                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
11953                                         /* a collision took us forward? */
11954                                         queue_only_for_init = 0;
11955                                         queue_only = 0;
11956                                 } else {
11957                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
11958                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
11959                                         queue_only_for_init = 0;
11960                                         queue_only = 1;
11961                                 }
11962                         }
11963                         if ((queue_only == 0) && (nagle_applies == 0)
11964                             ) {
11965                                 /*-
11966                                  * need to start chunk output
11967                                  * before blocking.. note that if
11968                                  * a lock is already applied, then
11969                                  * the input via the net is happening
11970                                  * and I don't need to start output :-D
11971                                  */
11972                                 if (hold_tcblock == 0) {
11973                                         if (SCTP_TCB_TRYLOCK(stcb)) {
11974                                                 hold_tcblock = 1;
11975                                                 sctp_chunk_output(inp,
11976                                                     stcb,
11977                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11978                                         }
11979                                 } else {
11980                                         sctp_chunk_output(inp,
11981                                             stcb,
11982                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
11983                                 }
11984                                 if (hold_tcblock == 1) {
11985                                         SCTP_TCB_UNLOCK(stcb);
11986                                         hold_tcblock = 0;
11987                                 }
11988                         }
11989                         SOCKBUF_LOCK(&so->so_snd);
11990                         /*-
11991                          * This is a bit strange, but I think it will
11992                          * work. The total_output_queue_size is locked and
11993                          * protected by the TCB_LOCK, which we just released.
11994                          * There is a race that can occur between releasing it
11995                          * above, and me getting the socket lock, where sacks
11996                          * come in but we have not put the SB_WAIT on the
11997                          * so_snd buffer to get the wakeup. After the LOCK
11998                          * is applied the sack_processing will also need to
11999                          * LOCK the so->so_snd to do the actual sowwakeup(). So
12000                          * once we have the socket buffer lock if we recheck the
12001                          * size we KNOW we will get to sleep safely with the
12002                          * wakeup flag in place.
12003                          */
12004                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
12005                             min(sctp_add_more_threshold, SCTP_SB_LIMIT_SND(so)))
12006                             ) {
12007                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12008                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
12009                                             so, asoc, uio->uio_resid);
12010                                 }
12011                                 be.error = 0;
12012                                 stcb->block_entry = &be;
12013                                 error = sbwait(&so->so_snd);
12014                                 stcb->block_entry = NULL;
12015 
12016                                 if (error || so->so_error || be.error) {
12017                                         if (error == 0) {
12018                                                 if (so->so_error)
12019                                                         error = so->so_error;
12020                                                 if (be.error) {
12021                                                         error = be.error;
12022                                                 }
12023                                         }
12024                                         SOCKBUF_UNLOCK(&so->so_snd);
12025                                         goto out_unlocked;
12026                                 }
12027                                 if (sctp_logging_level & SCTP_BLK_LOGGING_ENABLE) {
12028                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
12029                                             so, asoc, stcb->asoc.total_output_queue_size);
12030                                 }
12031                         }
12032                         SOCKBUF_UNLOCK(&so->so_snd);
12033                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12034                                 goto out_unlocked;
12035                         }
12036                 }
12037                 SCTP_TCB_SEND_LOCK(stcb);
12038                 if (sp) {
12039                         if (sp->msg_is_complete == 0) {
12040                                 strm->last_msg_incomplete = 1;
12041                                 asoc->stream_locked = 1;
12042                                 asoc->stream_locked_on = srcv->sinfo_stream;
12043                         } else {
12044                                 sp->sender_all_done = 1;
12045                                 strm->last_msg_incomplete = 0;
12046                                 asoc->stream_locked = 0;
12047                         }
12048                 } else {
12049                         SCTP_PRINTF("Huh no sp TSNH?\n");
12050                         strm->last_msg_incomplete = 0;
12051                         asoc->stream_locked = 0;
12052                 }
12053                 SCTP_TCB_SEND_UNLOCK(stcb);
12054                 if (uio->uio_resid == 0) {
12055                         got_all_of_the_send = 1;
12056                 }
12057         } else if (top) {
12058                 /* We send in a 0, since we do NOT have any locks */
12059                 error = sctp_msg_append(stcb, net, top, srcv, 0);
12060                 top = NULL;
12061                 if (srcv->sinfo_flags & SCTP_EOF) {
12062                         /*
12063                          * This should only happen for Panda for the mbuf
12064                          * send case, which does NOT yet support EEOR mode.
12065                          * Thus, we can just set this flag to do the proper
12066                          * EOF handling.
12067                          */
12068                         got_all_of_the_send = 1;
12069                 }
12070         }
12071         if (error) {
12072                 goto out;
12073         }
12074 dataless_eof:
12075         /* EOF thing ? */
12076         if ((srcv->sinfo_flags & SCTP_EOF) &&
12077             (got_all_of_the_send == 1) &&
12078             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)
12079             ) {
12080                 int cnt;
12081 
12082                 SCTP_STAT_INCR(sctps_sends_with_eof);
12083                 error = 0;
12084                 if (hold_tcblock == 0) {
12085                         SCTP_TCB_LOCK(stcb);
12086                         hold_tcblock = 1;
12087                 }
12088                 cnt = sctp_is_there_unsent_data(stcb);
12089                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12090                     TAILQ_EMPTY(&asoc->sent_queue) &&
12091                     (cnt == 0)) {
12092                         if (asoc->locked_on_sending) {
12093                                 goto abort_anyway;
12094                         }
12095                         /* there is nothing queued to send, so I'm done... */
12096                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12097                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12098                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12099                                 /* only send SHUTDOWN the first time through */
12100                                 sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
12101                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
12102                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
12103                                 }
12104                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
12105                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
12106                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
12107                                     asoc->primary_destination);
12108                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12109                                     asoc->primary_destination);
12110                         }
12111                 } else {
12112                         /*-
12113                          * we still got (or just got) data to send, so set
12114                          * SHUTDOWN_PENDING
12115                          */
12116                         /*-
12117                          * XXX sockets draft says that SCTP_EOF should be
12118                          * sent with no data.  currently, we will allow user
12119                          * data to be sent first and move to
12120                          * SHUTDOWN-PENDING
12121                          */
12122                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
12123                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
12124                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
12125                                 if (hold_tcblock == 0) {
12126                                         SCTP_TCB_LOCK(stcb);
12127                                         hold_tcblock = 1;
12128                                 }
12129                                 if (asoc->locked_on_sending) {
12130                                         /* Locked to send out the data */
12131                                         struct sctp_stream_queue_pending *sp;
12132 
12133                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
12134                                         if (sp) {
12135                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
12136                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
12137                                         }
12138                                 }
12139                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
12140                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
12141                                     TAILQ_EMPTY(&asoc->sent_queue) &&
12142                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
12143                         abort_anyway:
12144                                         if (free_cnt_applied) {
12145                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
12146                                                 free_cnt_applied = 0;
12147                                         }
12148                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
12149                                             SCTP_RESPONSE_TO_USER_REQ,
12150                                             NULL, SCTP_SO_LOCKED);
12151                                         /*
12152                                          * now relock the stcb so everything
12153                                          * is sane
12154                                          */
12155                                         hold_tcblock = 0;
12156                                         stcb = NULL;
12157                                         goto out;
12158                                 }
12159                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
12160                                     asoc->primary_destination);
12161                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
12162                         }
12163                 }
12164         }
12165 skip_out_eof:
12166         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
12167                 some_on_control = 1;
12168         }
12169         if ((net->flight_size > net->cwnd) &&
12170             (sctp_cmt_on_off == 0)) {
12171                 queue_only = 1;
12172         } else if (asoc->ifp_had_enobuf) {
12173                 SCTP_STAT_INCR(sctps_ifnomemqueued);
12174                 if (net->flight_size > (net->mtu * 2)) {
12175                         queue_only = 1;
12176                 } else {
12177                         queue_only = 0;
12178                 }
12179                 asoc->ifp_had_enobuf = 0;
12180                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12181                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12182                     sizeof(struct sctp_data_chunk)));
12183         } else {
12184                 un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
12185                     ((stcb->asoc.chunks_on_out_queue - stcb->asoc.total_flight_count) *
12186                     sizeof(struct sctp_data_chunk)));
12187                 if (net->flight_size > (net->mtu * stcb->asoc.max_burst)) {
12188                         queue_only = 1;
12189                         SCTP_STAT_INCR(sctps_send_burst_avoid);
12190                 } else if (net->flight_size > net->cwnd) {
12191                         queue_only = 1;
12192                         SCTP_STAT_INCR(sctps_send_cwnd_avoid);
12193                 } else {
12194                         queue_only = 0;
12195                 }
12196         }
12197         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
12198             (stcb->asoc.total_flight > 0) &&
12199             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
12200             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
12201             ) {
12202                 /*-
12203                  * Ok, Nagle is set on and we have data outstanding.
12204                  * Don't send anything and let SACKs drive out the
12205                  * data unless wen have a "full" segment to send.
12206                  */
12207                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12208                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
12209                 }
12210                 SCTP_STAT_INCR(sctps_naglequeued);
12211                 nagle_applies = 1;
12212         } else {
12213                 if (sctp_logging_level & SCTP_NAGLE_LOGGING_ENABLE) {
12214                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
12215                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
12216                 }
12217                 SCTP_STAT_INCR(sctps_naglesent);
12218                 nagle_applies = 0;
12219         }
12220         if (queue_only_for_init) {
12221                 if (hold_tcblock == 0) {
12222                         SCTP_TCB_LOCK(stcb);
12223                         hold_tcblock = 1;
12224                 }
12225                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
12226                         /* a collision took us forward? */
12227                         queue_only_for_init = 0;
12228                         queue_only = 0;
12229                 } else {
12230                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
12231                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
12232                         queue_only_for_init = 0;
12233                         queue_only = 1;
12234                 }
12235         }
12236         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
12237                 /* we can attempt to send too. */
12238                 if (hold_tcblock == 0) {
12239                         /*
12240                          * If there is activity recv'ing sacks no need to
12241                          * send
12242                          */
12243                         if (SCTP_TCB_TRYLOCK(stcb)) {
12244                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12245                                 hold_tcblock = 1;
12246                         }
12247                 } else {
12248                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12249                 }
12250         } else if ((queue_only == 0) &&
12251                     (stcb->asoc.peers_rwnd == 0) &&
12252             (stcb->asoc.total_flight == 0)) {
12253                 /* We get to have a probe outstanding */
12254                 if (hold_tcblock == 0) {
12255                         hold_tcblock = 1;
12256                         SCTP_TCB_LOCK(stcb);
12257                 }
12258                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
12259         } else if (some_on_control) {
12260                 int num_out, reason, cwnd_full, frag_point;
12261 
12262                 /* Here we do control only */
12263                 if (hold_tcblock == 0) {
12264                         hold_tcblock = 1;
12265                         SCTP_TCB_LOCK(stcb);
12266                 }
12267                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
12268                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
12269                     &reason, 1, &cwnd_full, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
12270         }
12271         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d",
12272             queue_only, stcb->asoc.peers_rwnd, un_sent,
12273             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
12274             stcb->asoc.total_output_queue_size, error);
12275 
12276 out:
12277 out_unlocked:
12278 
12279         if (local_soresv && stcb) {
12280                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
12281                 local_soresv = 0;
12282         }
12283         if (create_lock_applied) {
12284                 SCTP_ASOC_CREATE_UNLOCK(inp);
12285                 create_lock_applied = 0;
12286         }
12287         if ((stcb) && hold_tcblock) {
12288                 SCTP_TCB_UNLOCK(stcb);
12289         }
12290         if (stcb && free_cnt_applied) {
12291                 atomic_add_int(&stcb->asoc.refcnt, -1);
12292         }
12293 #ifdef INVARIANTS
12294         if (stcb) {
12295                 if (mtx_owned(&stcb->tcb_mtx)) {
12296                         panic("Leaving with tcb mtx owned?");
12297                 }
12298                 if (mtx_owned(&stcb->tcb_send_mtx)) {
12299                         panic("Leaving with tcb send mtx owned?");
12300                 }
12301         }
12302 #endif
12303         if (top) {
12304                 sctp_m_freem(top);
12305         }
12306         if (control) {
12307                 sctp_m_freem(control);
12308         }
12309         return (error);
12310 }
12311 
12312 
12313 /*
12314  * generate an AUTHentication chunk, if required
12315  */
12316 struct mbuf *
12317 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
12318     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
12319     struct sctp_tcb *stcb, uint8_t chunk)
12320 {
12321         struct mbuf *m_auth;
12322         struct sctp_auth_chunk *auth;
12323         int chunk_len;
12324 
12325         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
12326             (stcb == NULL))
12327                 return (m);
12328 
12329         /* sysctl disabled auth? */
12330         if (sctp_auth_disable)
12331                 return (m);
12332 
12333         /* peer doesn't do auth... */
12334         if (!stcb->asoc.peer_supports_auth) {
12335                 return (m);
12336         }
12337         /* does the requested chunk require auth? */
12338         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
12339                 return (m);
12340         }
12341         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_DONTWAIT, 1, MT_HEADER);
12342         if (m_auth == NULL) {
12343                 /* no mbuf's */
12344                 return (m);
12345         }
12346         /* reserve some space if this will be the first mbuf */
12347         if (m == NULL)
12348                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
12349         /* fill in the AUTH chunk details */
12350         auth = mtod(m_auth, struct sctp_auth_chunk *);
12351         bzero(auth, sizeof(*auth));
12352         auth->ch.chunk_type = SCTP_AUTHENTICATION;
12353         auth->ch.chunk_flags = 0;
12354         chunk_len = sizeof(*auth) +
12355             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
12356         auth->ch.chunk_length = htons(chunk_len);
12357         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
12358         /* key id and hmac digest will be computed and filled in upon send */
12359 
12360         /* save the offset where the auth was inserted into the chain */
12361         if (m != NULL) {
12362                 struct mbuf *cn;
12363 
12364                 *offset = 0;
12365                 cn = m;
12366                 while (cn) {
12367                         *offset += SCTP_BUF_LEN(cn);
12368                         cn = SCTP_BUF_NEXT(cn);
12369                 }
12370         } else
12371                 *offset = 0;
12372 
12373         /* update length and return pointer to the auth chunk */
12374         SCTP_BUF_LEN(m_auth) = chunk_len;
12375         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
12376         if (auth_ret != NULL)
12377                 *auth_ret = auth;
12378 
12379         return (m);
12380 }
12381 
12382 int
12383 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
12384 {
12385         struct nd_prefix *pfx = NULL;
12386         struct nd_pfxrouter *pfxrtr = NULL;
12387         struct sockaddr_in6 gw6;
12388 
12389         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
12390                 return (0);
12391 
12392         /* get prefix entry of address */
12393         LIST_FOREACH(pfx, &nd_prefix, ndpr_entry) {
12394                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
12395                         continue;
12396                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
12397                     &src6->sin6_addr, &pfx->ndpr_mask))
12398                         break;
12399         }
12400         /* no prefix entry in the prefix list */
12401         if (pfx == NULL) {
12402                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
12403                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12404                 return (0);
12405         }
12406         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
12407         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
12408 
12409         /* search installed gateway from prefix entry */
12410         for (pfxrtr = pfx->ndpr_advrtrs.lh_first; pfxrtr; pfxrtr =
12411             pfxrtr->pfr_next) {
12412                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
12413                 gw6.sin6_family = AF_INET6;
12414                 gw6.sin6_len = sizeof(struct sockaddr_in6);
12415                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
12416                     sizeof(struct in6_addr));
12417                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
12418                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
12419                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
12420                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12421                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
12422                     ro->ro_rt->rt_gateway)) {
12423                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
12424                         return (1);
12425                 }
12426         }
12427         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
12428         return (0);
12429 }
12430 int
12431 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
12432 {
12433         struct sockaddr_in *sin, *mask;
12434         struct ifaddr *ifa;
12435         struct in_addr srcnetaddr, gwnetaddr;
12436 
12437         if (ro == NULL || ro->ro_rt == NULL ||
12438             sifa->address.sa.sa_family != AF_INET) {
12439                 return (0);
12440         }
12441         ifa = (struct ifaddr *)sifa->ifa;
12442         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
12443         sin = (struct sockaddr_in *)&sifa->address.sin;
12444         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12445         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
12446         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
12447         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
12448 
12449         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
12450         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
12451         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
12452         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
12453         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
12454         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
12455                 return (1);
12456         }
12457         return (0);
12458 }

Cache object: 7f99a5b28b4b4d34d8b2111ede17dd67


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