sctp_output.c

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <sys/proc.h>
   38 #include <netinet/sctp_var.h>
   39 #include <netinet/sctp_sysctl.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_uio.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_bsd_addr.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp_crc32.h>
   53 #if defined(INET) || defined(INET6)
   54 #include <netinet/udp.h>
   55 #endif
   56 #include <netinet/udp_var.h>
   57 #include <machine/in_cksum.h>
   58 
   59 
   60 
   61 #define SCTP_MAX_GAPS_INARRAY 4
   62 struct sack_track {
   63         uint8_t right_edge;     /* mergable on the right edge */
   64         uint8_t left_edge;      /* mergable on the left edge */
   65         uint8_t num_entries;
   66         uint8_t spare;
   67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   68 };
   69 
   70 struct sack_track sack_array[256] = {
   71         {0, 0, 0, 0,            /* 0x00 */
   72                 {{0, 0},
   73                 {0, 0},
   74                 {0, 0},
   75                 {0, 0}
   76                 }
   77         },
   78         {1, 0, 1, 0,            /* 0x01 */
   79                 {{0, 0},
   80                 {0, 0},
   81                 {0, 0},
   82                 {0, 0}
   83                 }
   84         },
   85         {0, 0, 1, 0,            /* 0x02 */
   86                 {{1, 1},
   87                 {0, 0},
   88                 {0, 0},
   89                 {0, 0}
   90                 }
   91         },
   92         {1, 0, 1, 0,            /* 0x03 */
   93                 {{0, 1},
   94                 {0, 0},
   95                 {0, 0},
   96                 {0, 0}
   97                 }
   98         },
   99         {0, 0, 1, 0,            /* 0x04 */
  100                 {{2, 2},
  101                 {0, 0},
  102                 {0, 0},
  103                 {0, 0}
  104                 }
  105         },
  106         {1, 0, 2, 0,            /* 0x05 */
  107                 {{0, 0},
  108                 {2, 2},
  109                 {0, 0},
  110                 {0, 0}
  111                 }
  112         },
  113         {0, 0, 1, 0,            /* 0x06 */
  114                 {{1, 2},
  115                 {0, 0},
  116                 {0, 0},
  117                 {0, 0}
  118                 }
  119         },
  120         {1, 0, 1, 0,            /* 0x07 */
  121                 {{0, 2},
  122                 {0, 0},
  123                 {0, 0},
  124                 {0, 0}
  125                 }
  126         },
  127         {0, 0, 1, 0,            /* 0x08 */
  128                 {{3, 3},
  129                 {0, 0},
  130                 {0, 0},
  131                 {0, 0}
  132                 }
  133         },
  134         {1, 0, 2, 0,            /* 0x09 */
  135                 {{0, 0},
  136                 {3, 3},
  137                 {0, 0},
  138                 {0, 0}
  139                 }
  140         },
  141         {0, 0, 2, 0,            /* 0x0a */
  142                 {{1, 1},
  143                 {3, 3},
  144                 {0, 0},
  145                 {0, 0}
  146                 }
  147         },
  148         {1, 0, 2, 0,            /* 0x0b */
  149                 {{0, 1},
  150                 {3, 3},
  151                 {0, 0},
  152                 {0, 0}
  153                 }
  154         },
  155         {0, 0, 1, 0,            /* 0x0c */
  156                 {{2, 3},
  157                 {0, 0},
  158                 {0, 0},
  159                 {0, 0}
  160                 }
  161         },
  162         {1, 0, 2, 0,            /* 0x0d */
  163                 {{0, 0},
  164                 {2, 3},
  165                 {0, 0},
  166                 {0, 0}
  167                 }
  168         },
  169         {0, 0, 1, 0,            /* 0x0e */
  170                 {{1, 3},
  171                 {0, 0},
  172                 {0, 0},
  173                 {0, 0}
  174                 }
  175         },
  176         {1, 0, 1, 0,            /* 0x0f */
  177                 {{0, 3},
  178                 {0, 0},
  179                 {0, 0},
  180                 {0, 0}
  181                 }
  182         },
  183         {0, 0, 1, 0,            /* 0x10 */
  184                 {{4, 4},
  185                 {0, 0},
  186                 {0, 0},
  187                 {0, 0}
  188                 }
  189         },
  190         {1, 0, 2, 0,            /* 0x11 */
  191                 {{0, 0},
  192                 {4, 4},
  193                 {0, 0},
  194                 {0, 0}
  195                 }
  196         },
  197         {0, 0, 2, 0,            /* 0x12 */
  198                 {{1, 1},
  199                 {4, 4},
  200                 {0, 0},
  201                 {0, 0}
  202                 }
  203         },
  204         {1, 0, 2, 0,            /* 0x13 */
  205                 {{0, 1},
  206                 {4, 4},
  207                 {0, 0},
  208                 {0, 0}
  209                 }
  210         },
  211         {0, 0, 2, 0,            /* 0x14 */
  212                 {{2, 2},
  213                 {4, 4},
  214                 {0, 0},
  215                 {0, 0}
  216                 }
  217         },
  218         {1, 0, 3, 0,            /* 0x15 */
  219                 {{0, 0},
  220                 {2, 2},
  221                 {4, 4},
  222                 {0, 0}
  223                 }
  224         },
  225         {0, 0, 2, 0,            /* 0x16 */
  226                 {{1, 2},
  227                 {4, 4},
  228                 {0, 0},
  229                 {0, 0}
  230                 }
  231         },
  232         {1, 0, 2, 0,            /* 0x17 */
  233                 {{0, 2},
  234                 {4, 4},
  235                 {0, 0},
  236                 {0, 0}
  237                 }
  238         },
  239         {0, 0, 1, 0,            /* 0x18 */
  240                 {{3, 4},
  241                 {0, 0},
  242                 {0, 0},
  243                 {0, 0}
  244                 }
  245         },
  246         {1, 0, 2, 0,            /* 0x19 */
  247                 {{0, 0},
  248                 {3, 4},
  249                 {0, 0},
  250                 {0, 0}
  251                 }
  252         },
  253         {0, 0, 2, 0,            /* 0x1a */
  254                 {{1, 1},
  255                 {3, 4},
  256                 {0, 0},
  257                 {0, 0}
  258                 }
  259         },
  260         {1, 0, 2, 0,            /* 0x1b */
  261                 {{0, 1},
  262                 {3, 4},
  263                 {0, 0},
  264                 {0, 0}
  265                 }
  266         },
  267         {0, 0, 1, 0,            /* 0x1c */
  268                 {{2, 4},
  269                 {0, 0},
  270                 {0, 0},
  271                 {0, 0}
  272                 }
  273         },
  274         {1, 0, 2, 0,            /* 0x1d */
  275                 {{0, 0},
  276                 {2, 4},
  277                 {0, 0},
  278                 {0, 0}
  279                 }
  280         },
  281         {0, 0, 1, 0,            /* 0x1e */
  282                 {{1, 4},
  283                 {0, 0},
  284                 {0, 0},
  285                 {0, 0}
  286                 }
  287         },
  288         {1, 0, 1, 0,            /* 0x1f */
  289                 {{0, 4},
  290                 {0, 0},
  291                 {0, 0},
  292                 {0, 0}
  293                 }
  294         },
  295         {0, 0, 1, 0,            /* 0x20 */
  296                 {{5, 5},
  297                 {0, 0},
  298                 {0, 0},
  299                 {0, 0}
  300                 }
  301         },
  302         {1, 0, 2, 0,            /* 0x21 */
  303                 {{0, 0},
  304                 {5, 5},
  305                 {0, 0},
  306                 {0, 0}
  307                 }
  308         },
  309         {0, 0, 2, 0,            /* 0x22 */
  310                 {{1, 1},
  311                 {5, 5},
  312                 {0, 0},
  313                 {0, 0}
  314                 }
  315         },
  316         {1, 0, 2, 0,            /* 0x23 */
  317                 {{0, 1},
  318                 {5, 5},
  319                 {0, 0},
  320                 {0, 0}
  321                 }
  322         },
  323         {0, 0, 2, 0,            /* 0x24 */
  324                 {{2, 2},
  325                 {5, 5},
  326                 {0, 0},
  327                 {0, 0}
  328                 }
  329         },
  330         {1, 0, 3, 0,            /* 0x25 */
  331                 {{0, 0},
  332                 {2, 2},
  333                 {5, 5},
  334                 {0, 0}
  335                 }
  336         },
  337         {0, 0, 2, 0,            /* 0x26 */
  338                 {{1, 2},
  339                 {5, 5},
  340                 {0, 0},
  341                 {0, 0}
  342                 }
  343         },
  344         {1, 0, 2, 0,            /* 0x27 */
  345                 {{0, 2},
  346                 {5, 5},
  347                 {0, 0},
  348                 {0, 0}
  349                 }
  350         },
  351         {0, 0, 2, 0,            /* 0x28 */
  352                 {{3, 3},
  353                 {5, 5},
  354                 {0, 0},
  355                 {0, 0}
  356                 }
  357         },
  358         {1, 0, 3, 0,            /* 0x29 */
  359                 {{0, 0},
  360                 {3, 3},
  361                 {5, 5},
  362                 {0, 0}
  363                 }
  364         },
  365         {0, 0, 3, 0,            /* 0x2a */
  366                 {{1, 1},
  367                 {3, 3},
  368                 {5, 5},
  369                 {0, 0}
  370                 }
  371         },
  372         {1, 0, 3, 0,            /* 0x2b */
  373                 {{0, 1},
  374                 {3, 3},
  375                 {5, 5},
  376                 {0, 0}
  377                 }
  378         },
  379         {0, 0, 2, 0,            /* 0x2c */
  380                 {{2, 3},
  381                 {5, 5},
  382                 {0, 0},
  383                 {0, 0}
  384                 }
  385         },
  386         {1, 0, 3, 0,            /* 0x2d */
  387                 {{0, 0},
  388                 {2, 3},
  389                 {5, 5},
  390                 {0, 0}
  391                 }
  392         },
  393         {0, 0, 2, 0,            /* 0x2e */
  394                 {{1, 3},
  395                 {5, 5},
  396                 {0, 0},
  397                 {0, 0}
  398                 }
  399         },
  400         {1, 0, 2, 0,            /* 0x2f */
  401                 {{0, 3},
  402                 {5, 5},
  403                 {0, 0},
  404                 {0, 0}
  405                 }
  406         },
  407         {0, 0, 1, 0,            /* 0x30 */
  408                 {{4, 5},
  409                 {0, 0},
  410                 {0, 0},
  411                 {0, 0}
  412                 }
  413         },
  414         {1, 0, 2, 0,            /* 0x31 */
  415                 {{0, 0},
  416                 {4, 5},
  417                 {0, 0},
  418                 {0, 0}
  419                 }
  420         },
  421         {0, 0, 2, 0,            /* 0x32 */
  422                 {{1, 1},
  423                 {4, 5},
  424                 {0, 0},
  425                 {0, 0}
  426                 }
  427         },
  428         {1, 0, 2, 0,            /* 0x33 */
  429                 {{0, 1},
  430                 {4, 5},
  431                 {0, 0},
  432                 {0, 0}
  433                 }
  434         },
  435         {0, 0, 2, 0,            /* 0x34 */
  436                 {{2, 2},
  437                 {4, 5},
  438                 {0, 0},
  439                 {0, 0}
  440                 }
  441         },
  442         {1, 0, 3, 0,            /* 0x35 */
  443                 {{0, 0},
  444                 {2, 2},
  445                 {4, 5},
  446                 {0, 0}
  447                 }
  448         },
  449         {0, 0, 2, 0,            /* 0x36 */
  450                 {{1, 2},
  451                 {4, 5},
  452                 {0, 0},
  453                 {0, 0}
  454                 }
  455         },
  456         {1, 0, 2, 0,            /* 0x37 */
  457                 {{0, 2},
  458                 {4, 5},
  459                 {0, 0},
  460                 {0, 0}
  461                 }
  462         },
  463         {0, 0, 1, 0,            /* 0x38 */
  464                 {{3, 5},
  465                 {0, 0},
  466                 {0, 0},
  467                 {0, 0}
  468                 }
  469         },
  470         {1, 0, 2, 0,            /* 0x39 */
  471                 {{0, 0},
  472                 {3, 5},
  473                 {0, 0},
  474                 {0, 0}
  475                 }
  476         },
  477         {0, 0, 2, 0,            /* 0x3a */
  478                 {{1, 1},
  479                 {3, 5},
  480                 {0, 0},
  481                 {0, 0}
  482                 }
  483         },
  484         {1, 0, 2, 0,            /* 0x3b */
  485                 {{0, 1},
  486                 {3, 5},
  487                 {0, 0},
  488                 {0, 0}
  489                 }
  490         },
  491         {0, 0, 1, 0,            /* 0x3c */
  492                 {{2, 5},
  493                 {0, 0},
  494                 {0, 0},
  495                 {0, 0}
  496                 }
  497         },
  498         {1, 0, 2, 0,            /* 0x3d */
  499                 {{0, 0},
  500                 {2, 5},
  501                 {0, 0},
  502                 {0, 0}
  503                 }
  504         },
  505         {0, 0, 1, 0,            /* 0x3e */
  506                 {{1, 5},
  507                 {0, 0},
  508                 {0, 0},
  509                 {0, 0}
  510                 }
  511         },
  512         {1, 0, 1, 0,            /* 0x3f */
  513                 {{0, 5},
  514                 {0, 0},
  515                 {0, 0},
  516                 {0, 0}
  517                 }
  518         },
  519         {0, 0, 1, 0,            /* 0x40 */
  520                 {{6, 6},
  521                 {0, 0},
  522                 {0, 0},
  523                 {0, 0}
  524                 }
  525         },
  526         {1, 0, 2, 0,            /* 0x41 */
  527                 {{0, 0},
  528                 {6, 6},
  529                 {0, 0},
  530                 {0, 0}
  531                 }
  532         },
  533         {0, 0, 2, 0,            /* 0x42 */
  534                 {{1, 1},
  535                 {6, 6},
  536                 {0, 0},
  537                 {0, 0}
  538                 }
  539         },
  540         {1, 0, 2, 0,            /* 0x43 */
  541                 {{0, 1},
  542                 {6, 6},
  543                 {0, 0},
  544                 {0, 0}
  545                 }
  546         },
  547         {0, 0, 2, 0,            /* 0x44 */
  548                 {{2, 2},
  549                 {6, 6},
  550                 {0, 0},
  551                 {0, 0}
  552                 }
  553         },
  554         {1, 0, 3, 0,            /* 0x45 */
  555                 {{0, 0},
  556                 {2, 2},
  557                 {6, 6},
  558                 {0, 0}
  559                 }
  560         },
  561         {0, 0, 2, 0,            /* 0x46 */
  562                 {{1, 2},
  563                 {6, 6},
  564                 {0, 0},
  565                 {0, 0}
  566                 }
  567         },
  568         {1, 0, 2, 0,            /* 0x47 */
  569                 {{0, 2},
  570                 {6, 6},
  571                 {0, 0},
  572                 {0, 0}
  573                 }
  574         },
  575         {0, 0, 2, 0,            /* 0x48 */
  576                 {{3, 3},
  577                 {6, 6},
  578                 {0, 0},
  579                 {0, 0}
  580                 }
  581         },
  582         {1, 0, 3, 0,            /* 0x49 */
  583                 {{0, 0},
  584                 {3, 3},
  585                 {6, 6},
  586                 {0, 0}
  587                 }
  588         },
  589         {0, 0, 3, 0,            /* 0x4a */
  590                 {{1, 1},
  591                 {3, 3},
  592                 {6, 6},
  593                 {0, 0}
  594                 }
  595         },
  596         {1, 0, 3, 0,            /* 0x4b */
  597                 {{0, 1},
  598                 {3, 3},
  599                 {6, 6},
  600                 {0, 0}
  601                 }
  602         },
  603         {0, 0, 2, 0,            /* 0x4c */
  604                 {{2, 3},
  605                 {6, 6},
  606                 {0, 0},
  607                 {0, 0}
  608                 }
  609         },
  610         {1, 0, 3, 0,            /* 0x4d */
  611                 {{0, 0},
  612                 {2, 3},
  613                 {6, 6},
  614                 {0, 0}
  615                 }
  616         },
  617         {0, 0, 2, 0,            /* 0x4e */
  618                 {{1, 3},
  619                 {6, 6},
  620                 {0, 0},
  621                 {0, 0}
  622                 }
  623         },
  624         {1, 0, 2, 0,            /* 0x4f */
  625                 {{0, 3},
  626                 {6, 6},
  627                 {0, 0},
  628                 {0, 0}
  629                 }
  630         },
  631         {0, 0, 2, 0,            /* 0x50 */
  632                 {{4, 4},
  633                 {6, 6},
  634                 {0, 0},
  635                 {0, 0}
  636                 }
  637         },
  638         {1, 0, 3, 0,            /* 0x51 */
  639                 {{0, 0},
  640                 {4, 4},
  641                 {6, 6},
  642                 {0, 0}
  643                 }
  644         },
  645         {0, 0, 3, 0,            /* 0x52 */
  646                 {{1, 1},
  647                 {4, 4},
  648                 {6, 6},
  649                 {0, 0}
  650                 }
  651         },
  652         {1, 0, 3, 0,            /* 0x53 */
  653                 {{0, 1},
  654                 {4, 4},
  655                 {6, 6},
  656                 {0, 0}
  657                 }
  658         },
  659         {0, 0, 3, 0,            /* 0x54 */
  660                 {{2, 2},
  661                 {4, 4},
  662                 {6, 6},
  663                 {0, 0}
  664                 }
  665         },
  666         {1, 0, 4, 0,            /* 0x55 */
  667                 {{0, 0},
  668                 {2, 2},
  669                 {4, 4},
  670                 {6, 6}
  671                 }
  672         },
  673         {0, 0, 3, 0,            /* 0x56 */
  674                 {{1, 2},
  675                 {4, 4},
  676                 {6, 6},
  677                 {0, 0}
  678                 }
  679         },
  680         {1, 0, 3, 0,            /* 0x57 */
  681                 {{0, 2},
  682                 {4, 4},
  683                 {6, 6},
  684                 {0, 0}
  685                 }
  686         },
  687         {0, 0, 2, 0,            /* 0x58 */
  688                 {{3, 4},
  689                 {6, 6},
  690                 {0, 0},
  691                 {0, 0}
  692                 }
  693         },
  694         {1, 0, 3, 0,            /* 0x59 */
  695                 {{0, 0},
  696                 {3, 4},
  697                 {6, 6},
  698                 {0, 0}
  699                 }
  700         },
  701         {0, 0, 3, 0,            /* 0x5a */
  702                 {{1, 1},
  703                 {3, 4},
  704                 {6, 6},
  705                 {0, 0}
  706                 }
  707         },
  708         {1, 0, 3, 0,            /* 0x5b */
  709                 {{0, 1},
  710                 {3, 4},
  711                 {6, 6},
  712                 {0, 0}
  713                 }
  714         },
  715         {0, 0, 2, 0,            /* 0x5c */
  716                 {{2, 4},
  717                 {6, 6},
  718                 {0, 0},
  719                 {0, 0}
  720                 }
  721         },
  722         {1, 0, 3, 0,            /* 0x5d */
  723                 {{0, 0},
  724                 {2, 4},
  725                 {6, 6},
  726                 {0, 0}
  727                 }
  728         },
  729         {0, 0, 2, 0,            /* 0x5e */
  730                 {{1, 4},
  731                 {6, 6},
  732                 {0, 0},
  733                 {0, 0}
  734                 }
  735         },
  736         {1, 0, 2, 0,            /* 0x5f */
  737                 {{0, 4},
  738                 {6, 6},
  739                 {0, 0},
  740                 {0, 0}
  741                 }
  742         },
  743         {0, 0, 1, 0,            /* 0x60 */
  744                 {{5, 6},
  745                 {0, 0},
  746                 {0, 0},
  747                 {0, 0}
  748                 }
  749         },
  750         {1, 0, 2, 0,            /* 0x61 */
  751                 {{0, 0},
  752                 {5, 6},
  753                 {0, 0},
  754                 {0, 0}
  755                 }
  756         },
  757         {0, 0, 2, 0,            /* 0x62 */
  758                 {{1, 1},
  759                 {5, 6},
  760                 {0, 0},
  761                 {0, 0}
  762                 }
  763         },
  764         {1, 0, 2, 0,            /* 0x63 */
  765                 {{0, 1},
  766                 {5, 6},
  767                 {0, 0},
  768                 {0, 0}
  769                 }
  770         },
  771         {0, 0, 2, 0,            /* 0x64 */
  772                 {{2, 2},
  773                 {5, 6},
  774                 {0, 0},
  775                 {0, 0}
  776                 }
  777         },
  778         {1, 0, 3, 0,            /* 0x65 */
  779                 {{0, 0},
  780                 {2, 2},
  781                 {5, 6},
  782                 {0, 0}
  783                 }
  784         },
  785         {0, 0, 2, 0,            /* 0x66 */
  786                 {{1, 2},
  787                 {5, 6},
  788                 {0, 0},
  789                 {0, 0}
  790                 }
  791         },
  792         {1, 0, 2, 0,            /* 0x67 */
  793                 {{0, 2},
  794                 {5, 6},
  795                 {0, 0},
  796                 {0, 0}
  797                 }
  798         },
  799         {0, 0, 2, 0,            /* 0x68 */
  800                 {{3, 3},
  801                 {5, 6},
  802                 {0, 0},
  803                 {0, 0}
  804                 }
  805         },
  806         {1, 0, 3, 0,            /* 0x69 */
  807                 {{0, 0},
  808                 {3, 3},
  809                 {5, 6},
  810                 {0, 0}
  811                 }
  812         },
  813         {0, 0, 3, 0,            /* 0x6a */
  814                 {{1, 1},
  815                 {3, 3},
  816                 {5, 6},
  817                 {0, 0}
  818                 }
  819         },
  820         {1, 0, 3, 0,            /* 0x6b */
  821                 {{0, 1},
  822                 {3, 3},
  823                 {5, 6},
  824                 {0, 0}
  825                 }
  826         },
  827         {0, 0, 2, 0,            /* 0x6c */
  828                 {{2, 3},
  829                 {5, 6},
  830                 {0, 0},
  831                 {0, 0}
  832                 }
  833         },
  834         {1, 0, 3, 0,            /* 0x6d */
  835                 {{0, 0},
  836                 {2, 3},
  837                 {5, 6},
  838                 {0, 0}
  839                 }
  840         },
  841         {0, 0, 2, 0,            /* 0x6e */
  842                 {{1, 3},
  843                 {5, 6},
  844                 {0, 0},
  845                 {0, 0}
  846                 }
  847         },
  848         {1, 0, 2, 0,            /* 0x6f */
  849                 {{0, 3},
  850                 {5, 6},
  851                 {0, 0},
  852                 {0, 0}
  853                 }
  854         },
  855         {0, 0, 1, 0,            /* 0x70 */
  856                 {{4, 6},
  857                 {0, 0},
  858                 {0, 0},
  859                 {0, 0}
  860                 }
  861         },
  862         {1, 0, 2, 0,            /* 0x71 */
  863                 {{0, 0},
  864                 {4, 6},
  865                 {0, 0},
  866                 {0, 0}
  867                 }
  868         },
  869         {0, 0, 2, 0,            /* 0x72 */
  870                 {{1, 1},
  871                 {4, 6},
  872                 {0, 0},
  873                 {0, 0}
  874                 }
  875         },
  876         {1, 0, 2, 0,            /* 0x73 */
  877                 {{0, 1},
  878                 {4, 6},
  879                 {0, 0},
  880                 {0, 0}
  881                 }
  882         },
  883         {0, 0, 2, 0,            /* 0x74 */
  884                 {{2, 2},
  885                 {4, 6},
  886                 {0, 0},
  887                 {0, 0}
  888                 }
  889         },
  890         {1, 0, 3, 0,            /* 0x75 */
  891                 {{0, 0},
  892                 {2, 2},
  893                 {4, 6},
  894                 {0, 0}
  895                 }
  896         },
  897         {0, 0, 2, 0,            /* 0x76 */
  898                 {{1, 2},
  899                 {4, 6},
  900                 {0, 0},
  901                 {0, 0}
  902                 }
  903         },
  904         {1, 0, 2, 0,            /* 0x77 */
  905                 {{0, 2},
  906                 {4, 6},
  907                 {0, 0},
  908                 {0, 0}
  909                 }
  910         },
  911         {0, 0, 1, 0,            /* 0x78 */
  912                 {{3, 6},
  913                 {0, 0},
  914                 {0, 0},
  915                 {0, 0}
  916                 }
  917         },
  918         {1, 0, 2, 0,            /* 0x79 */
  919                 {{0, 0},
  920                 {3, 6},
  921                 {0, 0},
  922                 {0, 0}
  923                 }
  924         },
  925         {0, 0, 2, 0,            /* 0x7a */
  926                 {{1, 1},
  927                 {3, 6},
  928                 {0, 0},
  929                 {0, 0}
  930                 }
  931         },
  932         {1, 0, 2, 0,            /* 0x7b */
  933                 {{0, 1},
  934                 {3, 6},
  935                 {0, 0},
  936                 {0, 0}
  937                 }
  938         },
  939         {0, 0, 1, 0,            /* 0x7c */
  940                 {{2, 6},
  941                 {0, 0},
  942                 {0, 0},
  943                 {0, 0}
  944                 }
  945         },
  946         {1, 0, 2, 0,            /* 0x7d */
  947                 {{0, 0},
  948                 {2, 6},
  949                 {0, 0},
  950                 {0, 0}
  951                 }
  952         },
  953         {0, 0, 1, 0,            /* 0x7e */
  954                 {{1, 6},
  955                 {0, 0},
  956                 {0, 0},
  957                 {0, 0}
  958                 }
  959         },
  960         {1, 0, 1, 0,            /* 0x7f */
  961                 {{0, 6},
  962                 {0, 0},
  963                 {0, 0},
  964                 {0, 0}
  965                 }
  966         },
  967         {0, 1, 1, 0,            /* 0x80 */
  968                 {{7, 7},
  969                 {0, 0},
  970                 {0, 0},
  971                 {0, 0}
  972                 }
  973         },
  974         {1, 1, 2, 0,            /* 0x81 */
  975                 {{0, 0},
  976                 {7, 7},
  977                 {0, 0},
  978                 {0, 0}
  979                 }
  980         },
  981         {0, 1, 2, 0,            /* 0x82 */
  982                 {{1, 1},
  983                 {7, 7},
  984                 {0, 0},
  985                 {0, 0}
  986                 }
  987         },
  988         {1, 1, 2, 0,            /* 0x83 */
  989                 {{0, 1},
  990                 {7, 7},
  991                 {0, 0},
  992                 {0, 0}
  993                 }
  994         },
  995         {0, 1, 2, 0,            /* 0x84 */
  996                 {{2, 2},
  997                 {7, 7},
  998                 {0, 0},
  999                 {0, 0}
 1000                 }
 1001         },
 1002         {1, 1, 3, 0,            /* 0x85 */
 1003                 {{0, 0},
 1004                 {2, 2},
 1005                 {7, 7},
 1006                 {0, 0}
 1007                 }
 1008         },
 1009         {0, 1, 2, 0,            /* 0x86 */
 1010                 {{1, 2},
 1011                 {7, 7},
 1012                 {0, 0},
 1013                 {0, 0}
 1014                 }
 1015         },
 1016         {1, 1, 2, 0,            /* 0x87 */
 1017                 {{0, 2},
 1018                 {7, 7},
 1019                 {0, 0},
 1020                 {0, 0}
 1021                 }
 1022         },
 1023         {0, 1, 2, 0,            /* 0x88 */
 1024                 {{3, 3},
 1025                 {7, 7},
 1026                 {0, 0},
 1027                 {0, 0}
 1028                 }
 1029         },
 1030         {1, 1, 3, 0,            /* 0x89 */
 1031                 {{0, 0},
 1032                 {3, 3},
 1033                 {7, 7},
 1034                 {0, 0}
 1035                 }
 1036         },
 1037         {0, 1, 3, 0,            /* 0x8a */
 1038                 {{1, 1},
 1039                 {3, 3},
 1040                 {7, 7},
 1041                 {0, 0}
 1042                 }
 1043         },
 1044         {1, 1, 3, 0,            /* 0x8b */
 1045                 {{0, 1},
 1046                 {3, 3},
 1047                 {7, 7},
 1048                 {0, 0}
 1049                 }
 1050         },
 1051         {0, 1, 2, 0,            /* 0x8c */
 1052                 {{2, 3},
 1053                 {7, 7},
 1054                 {0, 0},
 1055                 {0, 0}
 1056                 }
 1057         },
 1058         {1, 1, 3, 0,            /* 0x8d */
 1059                 {{0, 0},
 1060                 {2, 3},
 1061                 {7, 7},
 1062                 {0, 0}
 1063                 }
 1064         },
 1065         {0, 1, 2, 0,            /* 0x8e */
 1066                 {{1, 3},
 1067                 {7, 7},
 1068                 {0, 0},
 1069                 {0, 0}
 1070                 }
 1071         },
 1072         {1, 1, 2, 0,            /* 0x8f */
 1073                 {{0, 3},
 1074                 {7, 7},
 1075                 {0, 0},
 1076                 {0, 0}
 1077                 }
 1078         },
 1079         {0, 1, 2, 0,            /* 0x90 */
 1080                 {{4, 4},
 1081                 {7, 7},
 1082                 {0, 0},
 1083                 {0, 0}
 1084                 }
 1085         },
 1086         {1, 1, 3, 0,            /* 0x91 */
 1087                 {{0, 0},
 1088                 {4, 4},
 1089                 {7, 7},
 1090                 {0, 0}
 1091                 }
 1092         },
 1093         {0, 1, 3, 0,            /* 0x92 */
 1094                 {{1, 1},
 1095                 {4, 4},
 1096                 {7, 7},
 1097                 {0, 0}
 1098                 }
 1099         },
 1100         {1, 1, 3, 0,            /* 0x93 */
 1101                 {{0, 1},
 1102                 {4, 4},
 1103                 {7, 7},
 1104                 {0, 0}
 1105                 }
 1106         },
 1107         {0, 1, 3, 0,            /* 0x94 */
 1108                 {{2, 2},
 1109                 {4, 4},
 1110                 {7, 7},
 1111                 {0, 0}
 1112                 }
 1113         },
 1114         {1, 1, 4, 0,            /* 0x95 */
 1115                 {{0, 0},
 1116                 {2, 2},
 1117                 {4, 4},
 1118                 {7, 7}
 1119                 }
 1120         },
 1121         {0, 1, 3, 0,            /* 0x96 */
 1122                 {{1, 2},
 1123                 {4, 4},
 1124                 {7, 7},
 1125                 {0, 0}
 1126                 }
 1127         },
 1128         {1, 1, 3, 0,            /* 0x97 */
 1129                 {{0, 2},
 1130                 {4, 4},
 1131                 {7, 7},
 1132                 {0, 0}
 1133                 }
 1134         },
 1135         {0, 1, 2, 0,            /* 0x98 */
 1136                 {{3, 4},
 1137                 {7, 7},
 1138                 {0, 0},
 1139                 {0, 0}
 1140                 }
 1141         },
 1142         {1, 1, 3, 0,            /* 0x99 */
 1143                 {{0, 0},
 1144                 {3, 4},
 1145                 {7, 7},
 1146                 {0, 0}
 1147                 }
 1148         },
 1149         {0, 1, 3, 0,            /* 0x9a */
 1150                 {{1, 1},
 1151                 {3, 4},
 1152                 {7, 7},
 1153                 {0, 0}
 1154                 }
 1155         },
 1156         {1, 1, 3, 0,            /* 0x9b */
 1157                 {{0, 1},
 1158                 {3, 4},
 1159                 {7, 7},
 1160                 {0, 0}
 1161                 }
 1162         },
 1163         {0, 1, 2, 0,            /* 0x9c */
 1164                 {{2, 4},
 1165                 {7, 7},
 1166                 {0, 0},
 1167                 {0, 0}
 1168                 }
 1169         },
 1170         {1, 1, 3, 0,            /* 0x9d */
 1171                 {{0, 0},
 1172                 {2, 4},
 1173                 {7, 7},
 1174                 {0, 0}
 1175                 }
 1176         },
 1177         {0, 1, 2, 0,            /* 0x9e */
 1178                 {{1, 4},
 1179                 {7, 7},
 1180                 {0, 0},
 1181                 {0, 0}
 1182                 }
 1183         },
 1184         {1, 1, 2, 0,            /* 0x9f */
 1185                 {{0, 4},
 1186                 {7, 7},
 1187                 {0, 0},
 1188                 {0, 0}
 1189                 }
 1190         },
 1191         {0, 1, 2, 0,            /* 0xa0 */
 1192                 {{5, 5},
 1193                 {7, 7},
 1194                 {0, 0},
 1195                 {0, 0}
 1196                 }
 1197         },
 1198         {1, 1, 3, 0,            /* 0xa1 */
 1199                 {{0, 0},
 1200                 {5, 5},
 1201                 {7, 7},
 1202                 {0, 0}
 1203                 }
 1204         },
 1205         {0, 1, 3, 0,            /* 0xa2 */
 1206                 {{1, 1},
 1207                 {5, 5},
 1208                 {7, 7},
 1209                 {0, 0}
 1210                 }
 1211         },
 1212         {1, 1, 3, 0,            /* 0xa3 */
 1213                 {{0, 1},
 1214                 {5, 5},
 1215                 {7, 7},
 1216                 {0, 0}
 1217                 }
 1218         },
 1219         {0, 1, 3, 0,            /* 0xa4 */
 1220                 {{2, 2},
 1221                 {5, 5},
 1222                 {7, 7},
 1223                 {0, 0}
 1224                 }
 1225         },
 1226         {1, 1, 4, 0,            /* 0xa5 */
 1227                 {{0, 0},
 1228                 {2, 2},
 1229                 {5, 5},
 1230                 {7, 7}
 1231                 }
 1232         },
 1233         {0, 1, 3, 0,            /* 0xa6 */
 1234                 {{1, 2},
 1235                 {5, 5},
 1236                 {7, 7},
 1237                 {0, 0}
 1238                 }
 1239         },
 1240         {1, 1, 3, 0,            /* 0xa7 */
 1241                 {{0, 2},
 1242                 {5, 5},
 1243                 {7, 7},
 1244                 {0, 0}
 1245                 }
 1246         },
 1247         {0, 1, 3, 0,            /* 0xa8 */
 1248                 {{3, 3},
 1249                 {5, 5},
 1250                 {7, 7},
 1251                 {0, 0}
 1252                 }
 1253         },
 1254         {1, 1, 4, 0,            /* 0xa9 */
 1255                 {{0, 0},
 1256                 {3, 3},
 1257                 {5, 5},
 1258                 {7, 7}
 1259                 }
 1260         },
 1261         {0, 1, 4, 0,            /* 0xaa */
 1262                 {{1, 1},
 1263                 {3, 3},
 1264                 {5, 5},
 1265                 {7, 7}
 1266                 }
 1267         },
 1268         {1, 1, 4, 0,            /* 0xab */
 1269                 {{0, 1},
 1270                 {3, 3},
 1271                 {5, 5},
 1272                 {7, 7}
 1273                 }
 1274         },
 1275         {0, 1, 3, 0,            /* 0xac */
 1276                 {{2, 3},
 1277                 {5, 5},
 1278                 {7, 7},
 1279                 {0, 0}
 1280                 }
 1281         },
 1282         {1, 1, 4, 0,            /* 0xad */
 1283                 {{0, 0},
 1284                 {2, 3},
 1285                 {5, 5},
 1286                 {7, 7}
 1287                 }
 1288         },
 1289         {0, 1, 3, 0,            /* 0xae */
 1290                 {{1, 3},
 1291                 {5, 5},
 1292                 {7, 7},
 1293                 {0, 0}
 1294                 }
 1295         },
 1296         {1, 1, 3, 0,            /* 0xaf */
 1297                 {{0, 3},
 1298                 {5, 5},
 1299                 {7, 7},
 1300                 {0, 0}
 1301                 }
 1302         },
 1303         {0, 1, 2, 0,            /* 0xb0 */
 1304                 {{4, 5},
 1305                 {7, 7},
 1306                 {0, 0},
 1307                 {0, 0}
 1308                 }
 1309         },
 1310         {1, 1, 3, 0,            /* 0xb1 */
 1311                 {{0, 0},
 1312                 {4, 5},
 1313                 {7, 7},
 1314                 {0, 0}
 1315                 }
 1316         },
 1317         {0, 1, 3, 0,            /* 0xb2 */
 1318                 {{1, 1},
 1319                 {4, 5},
 1320                 {7, 7},
 1321                 {0, 0}
 1322                 }
 1323         },
 1324         {1, 1, 3, 0,            /* 0xb3 */
 1325                 {{0, 1},
 1326                 {4, 5},
 1327                 {7, 7},
 1328                 {0, 0}
 1329                 }
 1330         },
 1331         {0, 1, 3, 0,            /* 0xb4 */
 1332                 {{2, 2},
 1333                 {4, 5},
 1334                 {7, 7},
 1335                 {0, 0}
 1336                 }
 1337         },
 1338         {1, 1, 4, 0,            /* 0xb5 */
 1339                 {{0, 0},
 1340                 {2, 2},
 1341                 {4, 5},
 1342                 {7, 7}
 1343                 }
 1344         },
 1345         {0, 1, 3, 0,            /* 0xb6 */
 1346                 {{1, 2},
 1347                 {4, 5},
 1348                 {7, 7},
 1349                 {0, 0}
 1350                 }
 1351         },
 1352         {1, 1, 3, 0,            /* 0xb7 */
 1353                 {{0, 2},
 1354                 {4, 5},
 1355                 {7, 7},
 1356                 {0, 0}
 1357                 }
 1358         },
 1359         {0, 1, 2, 0,            /* 0xb8 */
 1360                 {{3, 5},
 1361                 {7, 7},
 1362                 {0, 0},
 1363                 {0, 0}
 1364                 }
 1365         },
 1366         {1, 1, 3, 0,            /* 0xb9 */
 1367                 {{0, 0},
 1368                 {3, 5},
 1369                 {7, 7},
 1370                 {0, 0}
 1371                 }
 1372         },
 1373         {0, 1, 3, 0,            /* 0xba */
 1374                 {{1, 1},
 1375                 {3, 5},
 1376                 {7, 7},
 1377                 {0, 0}
 1378                 }
 1379         },
 1380         {1, 1, 3, 0,            /* 0xbb */
 1381                 {{0, 1},
 1382                 {3, 5},
 1383                 {7, 7},
 1384                 {0, 0}
 1385                 }
 1386         },
 1387         {0, 1, 2, 0,            /* 0xbc */
 1388                 {{2, 5},
 1389                 {7, 7},
 1390                 {0, 0},
 1391                 {0, 0}
 1392                 }
 1393         },
 1394         {1, 1, 3, 0,            /* 0xbd */
 1395                 {{0, 0},
 1396                 {2, 5},
 1397                 {7, 7},
 1398                 {0, 0}
 1399                 }
 1400         },
 1401         {0, 1, 2, 0,            /* 0xbe */
 1402                 {{1, 5},
 1403                 {7, 7},
 1404                 {0, 0},
 1405                 {0, 0}
 1406                 }
 1407         },
 1408         {1, 1, 2, 0,            /* 0xbf */
 1409                 {{0, 5},
 1410                 {7, 7},
 1411                 {0, 0},
 1412                 {0, 0}
 1413                 }
 1414         },
 1415         {0, 1, 1, 0,            /* 0xc0 */
 1416                 {{6, 7},
 1417                 {0, 0},
 1418                 {0, 0},
 1419                 {0, 0}
 1420                 }
 1421         },
 1422         {1, 1, 2, 0,            /* 0xc1 */
 1423                 {{0, 0},
 1424                 {6, 7},
 1425                 {0, 0},
 1426                 {0, 0}
 1427                 }
 1428         },
 1429         {0, 1, 2, 0,            /* 0xc2 */
 1430                 {{1, 1},
 1431                 {6, 7},
 1432                 {0, 0},
 1433                 {0, 0}
 1434                 }
 1435         },
 1436         {1, 1, 2, 0,            /* 0xc3 */
 1437                 {{0, 1},
 1438                 {6, 7},
 1439                 {0, 0},
 1440                 {0, 0}
 1441                 }
 1442         },
 1443         {0, 1, 2, 0,            /* 0xc4 */
 1444                 {{2, 2},
 1445                 {6, 7},
 1446                 {0, 0},
 1447                 {0, 0}
 1448                 }
 1449         },
 1450         {1, 1, 3, 0,            /* 0xc5 */
 1451                 {{0, 0},
 1452                 {2, 2},
 1453                 {6, 7},
 1454                 {0, 0}
 1455                 }
 1456         },
 1457         {0, 1, 2, 0,            /* 0xc6 */
 1458                 {{1, 2},
 1459                 {6, 7},
 1460                 {0, 0},
 1461                 {0, 0}
 1462                 }
 1463         },
 1464         {1, 1, 2, 0,            /* 0xc7 */
 1465                 {{0, 2},
 1466                 {6, 7},
 1467                 {0, 0},
 1468                 {0, 0}
 1469                 }
 1470         },
 1471         {0, 1, 2, 0,            /* 0xc8 */
 1472                 {{3, 3},
 1473                 {6, 7},
 1474                 {0, 0},
 1475                 {0, 0}
 1476                 }
 1477         },
 1478         {1, 1, 3, 0,            /* 0xc9 */
 1479                 {{0, 0},
 1480                 {3, 3},
 1481                 {6, 7},
 1482                 {0, 0}
 1483                 }
 1484         },
 1485         {0, 1, 3, 0,            /* 0xca */
 1486                 {{1, 1},
 1487                 {3, 3},
 1488                 {6, 7},
 1489                 {0, 0}
 1490                 }
 1491         },
 1492         {1, 1, 3, 0,            /* 0xcb */
 1493                 {{0, 1},
 1494                 {3, 3},
 1495                 {6, 7},
 1496                 {0, 0}
 1497                 }
 1498         },
 1499         {0, 1, 2, 0,            /* 0xcc */
 1500                 {{2, 3},
 1501                 {6, 7},
 1502                 {0, 0},
 1503                 {0, 0}
 1504                 }
 1505         },
 1506         {1, 1, 3, 0,            /* 0xcd */
 1507                 {{0, 0},
 1508                 {2, 3},
 1509                 {6, 7},
 1510                 {0, 0}
 1511                 }
 1512         },
 1513         {0, 1, 2, 0,            /* 0xce */
 1514                 {{1, 3},
 1515                 {6, 7},
 1516                 {0, 0},
 1517                 {0, 0}
 1518                 }
 1519         },
 1520         {1, 1, 2, 0,            /* 0xcf */
 1521                 {{0, 3},
 1522                 {6, 7},
 1523                 {0, 0},
 1524                 {0, 0}
 1525                 }
 1526         },
 1527         {0, 1, 2, 0,            /* 0xd0 */
 1528                 {{4, 4},
 1529                 {6, 7},
 1530                 {0, 0},
 1531                 {0, 0}
 1532                 }
 1533         },
 1534         {1, 1, 3, 0,            /* 0xd1 */
 1535                 {{0, 0},
 1536                 {4, 4},
 1537                 {6, 7},
 1538                 {0, 0}
 1539                 }
 1540         },
 1541         {0, 1, 3, 0,            /* 0xd2 */
 1542                 {{1, 1},
 1543                 {4, 4},
 1544                 {6, 7},
 1545                 {0, 0}
 1546                 }
 1547         },
 1548         {1, 1, 3, 0,            /* 0xd3 */
 1549                 {{0, 1},
 1550                 {4, 4},
 1551                 {6, 7},
 1552                 {0, 0}
 1553                 }
 1554         },
 1555         {0, 1, 3, 0,            /* 0xd4 */
 1556                 {{2, 2},
 1557                 {4, 4},
 1558                 {6, 7},
 1559                 {0, 0}
 1560                 }
 1561         },
 1562         {1, 1, 4, 0,            /* 0xd5 */
 1563                 {{0, 0},
 1564                 {2, 2},
 1565                 {4, 4},
 1566                 {6, 7}
 1567                 }
 1568         },
 1569         {0, 1, 3, 0,            /* 0xd6 */
 1570                 {{1, 2},
 1571                 {4, 4},
 1572                 {6, 7},
 1573                 {0, 0}
 1574                 }
 1575         },
 1576         {1, 1, 3, 0,            /* 0xd7 */
 1577                 {{0, 2},
 1578                 {4, 4},
 1579                 {6, 7},
 1580                 {0, 0}
 1581                 }
 1582         },
 1583         {0, 1, 2, 0,            /* 0xd8 */
 1584                 {{3, 4},
 1585                 {6, 7},
 1586                 {0, 0},
 1587                 {0, 0}
 1588                 }
 1589         },
 1590         {1, 1, 3, 0,            /* 0xd9 */
 1591                 {{0, 0},
 1592                 {3, 4},
 1593                 {6, 7},
 1594                 {0, 0}
 1595                 }
 1596         },
 1597         {0, 1, 3, 0,            /* 0xda */
 1598                 {{1, 1},
 1599                 {3, 4},
 1600                 {6, 7},
 1601                 {0, 0}
 1602                 }
 1603         },
 1604         {1, 1, 3, 0,            /* 0xdb */
 1605                 {{0, 1},
 1606                 {3, 4},
 1607                 {6, 7},
 1608                 {0, 0}
 1609                 }
 1610         },
 1611         {0, 1, 2, 0,            /* 0xdc */
 1612                 {{2, 4},
 1613                 {6, 7},
 1614                 {0, 0},
 1615                 {0, 0}
 1616                 }
 1617         },
 1618         {1, 1, 3, 0,            /* 0xdd */
 1619                 {{0, 0},
 1620                 {2, 4},
 1621                 {6, 7},
 1622                 {0, 0}
 1623                 }
 1624         },
 1625         {0, 1, 2, 0,            /* 0xde */
 1626                 {{1, 4},
 1627                 {6, 7},
 1628                 {0, 0},
 1629                 {0, 0}
 1630                 }
 1631         },
 1632         {1, 1, 2, 0,            /* 0xdf */
 1633                 {{0, 4},
 1634                 {6, 7},
 1635                 {0, 0},
 1636                 {0, 0}
 1637                 }
 1638         },
 1639         {0, 1, 1, 0,            /* 0xe0 */
 1640                 {{5, 7},
 1641                 {0, 0},
 1642                 {0, 0},
 1643                 {0, 0}
 1644                 }
 1645         },
 1646         {1, 1, 2, 0,            /* 0xe1 */
 1647                 {{0, 0},
 1648                 {5, 7},
 1649                 {0, 0},
 1650                 {0, 0}
 1651                 }
 1652         },
 1653         {0, 1, 2, 0,            /* 0xe2 */
 1654                 {{1, 1},
 1655                 {5, 7},
 1656                 {0, 0},
 1657                 {0, 0}
 1658                 }
 1659         },
 1660         {1, 1, 2, 0,            /* 0xe3 */
 1661                 {{0, 1},
 1662                 {5, 7},
 1663                 {0, 0},
 1664                 {0, 0}
 1665                 }
 1666         },
 1667         {0, 1, 2, 0,            /* 0xe4 */
 1668                 {{2, 2},
 1669                 {5, 7},
 1670                 {0, 0},
 1671                 {0, 0}
 1672                 }
 1673         },
 1674         {1, 1, 3, 0,            /* 0xe5 */
 1675                 {{0, 0},
 1676                 {2, 2},
 1677                 {5, 7},
 1678                 {0, 0}
 1679                 }
 1680         },
 1681         {0, 1, 2, 0,            /* 0xe6 */
 1682                 {{1, 2},
 1683                 {5, 7},
 1684                 {0, 0},
 1685                 {0, 0}
 1686                 }
 1687         },
 1688         {1, 1, 2, 0,            /* 0xe7 */
 1689                 {{0, 2},
 1690                 {5, 7},
 1691                 {0, 0},
 1692                 {0, 0}
 1693                 }
 1694         },
 1695         {0, 1, 2, 0,            /* 0xe8 */
 1696                 {{3, 3},
 1697                 {5, 7},
 1698                 {0, 0},
 1699                 {0, 0}
 1700                 }
 1701         },
 1702         {1, 1, 3, 0,            /* 0xe9 */
 1703                 {{0, 0},
 1704                 {3, 3},
 1705                 {5, 7},
 1706                 {0, 0}
 1707                 }
 1708         },
 1709         {0, 1, 3, 0,            /* 0xea */
 1710                 {{1, 1},
 1711                 {3, 3},
 1712                 {5, 7},
 1713                 {0, 0}
 1714                 }
 1715         },
 1716         {1, 1, 3, 0,            /* 0xeb */
 1717                 {{0, 1},
 1718                 {3, 3},
 1719                 {5, 7},
 1720                 {0, 0}
 1721                 }
 1722         },
 1723         {0, 1, 2, 0,            /* 0xec */
 1724                 {{2, 3},
 1725                 {5, 7},
 1726                 {0, 0},
 1727                 {0, 0}
 1728                 }
 1729         },
 1730         {1, 1, 3, 0,            /* 0xed */
 1731                 {{0, 0},
 1732                 {2, 3},
 1733                 {5, 7},
 1734                 {0, 0}
 1735                 }
 1736         },
 1737         {0, 1, 2, 0,            /* 0xee */
 1738                 {{1, 3},
 1739                 {5, 7},
 1740                 {0, 0},
 1741                 {0, 0}
 1742                 }
 1743         },
 1744         {1, 1, 2, 0,            /* 0xef */
 1745                 {{0, 3},
 1746                 {5, 7},
 1747                 {0, 0},
 1748                 {0, 0}
 1749                 }
 1750         },
 1751         {0, 1, 1, 0,            /* 0xf0 */
 1752                 {{4, 7},
 1753                 {0, 0},
 1754                 {0, 0},
 1755                 {0, 0}
 1756                 }
 1757         },
 1758         {1, 1, 2, 0,            /* 0xf1 */
 1759                 {{0, 0},
 1760                 {4, 7},
 1761                 {0, 0},
 1762                 {0, 0}
 1763                 }
 1764         },
 1765         {0, 1, 2, 0,            /* 0xf2 */
 1766                 {{1, 1},
 1767                 {4, 7},
 1768                 {0, 0},
 1769                 {0, 0}
 1770                 }
 1771         },
 1772         {1, 1, 2, 0,            /* 0xf3 */
 1773                 {{0, 1},
 1774                 {4, 7},
 1775                 {0, 0},
 1776                 {0, 0}
 1777                 }
 1778         },
 1779         {0, 1, 2, 0,            /* 0xf4 */
 1780                 {{2, 2},
 1781                 {4, 7},
 1782                 {0, 0},
 1783                 {0, 0}
 1784                 }
 1785         },
 1786         {1, 1, 3, 0,            /* 0xf5 */
 1787                 {{0, 0},
 1788                 {2, 2},
 1789                 {4, 7},
 1790                 {0, 0}
 1791                 }
 1792         },
 1793         {0, 1, 2, 0,            /* 0xf6 */
 1794                 {{1, 2},
 1795                 {4, 7},
 1796                 {0, 0},
 1797                 {0, 0}
 1798                 }
 1799         },
 1800         {1, 1, 2, 0,            /* 0xf7 */
 1801                 {{0, 2},
 1802                 {4, 7},
 1803                 {0, 0},
 1804                 {0, 0}
 1805                 }
 1806         },
 1807         {0, 1, 1, 0,            /* 0xf8 */
 1808                 {{3, 7},
 1809                 {0, 0},
 1810                 {0, 0},
 1811                 {0, 0}
 1812                 }
 1813         },
 1814         {1, 1, 2, 0,            /* 0xf9 */
 1815                 {{0, 0},
 1816                 {3, 7},
 1817                 {0, 0},
 1818                 {0, 0}
 1819                 }
 1820         },
 1821         {0, 1, 2, 0,            /* 0xfa */
 1822                 {{1, 1},
 1823                 {3, 7},
 1824                 {0, 0},
 1825                 {0, 0}
 1826                 }
 1827         },
 1828         {1, 1, 2, 0,            /* 0xfb */
 1829                 {{0, 1},
 1830                 {3, 7},
 1831                 {0, 0},
 1832                 {0, 0}
 1833                 }
 1834         },
 1835         {0, 1, 1, 0,            /* 0xfc */
 1836                 {{2, 7},
 1837                 {0, 0},
 1838                 {0, 0},
 1839                 {0, 0}
 1840                 }
 1841         },
 1842         {1, 1, 2, 0,            /* 0xfd */
 1843                 {{0, 0},
 1844                 {2, 7},
 1845                 {0, 0},
 1846                 {0, 0}
 1847                 }
 1848         },
 1849         {0, 1, 1, 0,            /* 0xfe */
 1850                 {{1, 7},
 1851                 {0, 0},
 1852                 {0, 0},
 1853                 {0, 0}
 1854                 }
 1855         },
 1856         {1, 1, 1, 0,            /* 0xff */
 1857                 {{0, 7},
 1858                 {0, 0},
 1859                 {0, 0},
 1860                 {0, 0}
 1861                 }
 1862         }
 1863 };
 1864 
 1865 
 1866 int
 1867 sctp_is_address_in_scope(struct sctp_ifa *ifa,
 1868     struct sctp_scoping *scope,
 1869     int do_update)
 1870 {
 1871         if ((scope->loopback_scope == 0) &&
 1872             (ifa->ifn_p) && SCTP_IFN_IS_IFT_LOOP(ifa->ifn_p)) {
 1873                 /*
 1874                  * skip loopback if not in scope *
 1875                  */
 1876                 return (0);
 1877         }
 1878         switch (ifa->address.sa.sa_family) {
 1879 #ifdef INET
 1880         case AF_INET:
 1881                 if (scope->ipv4_addr_legal) {
 1882                         struct sockaddr_in *sin;
 1883 
 1884                         sin = &ifa->address.sin;
 1885                         if (sin->sin_addr.s_addr == 0) {
 1886                                 /* not in scope , unspecified */
 1887                                 return (0);
 1888                         }
 1889                         if ((scope->ipv4_local_scope == 0) &&
 1890                             (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
 1891                                 /* private address not in scope */
 1892                                 return (0);
 1893                         }
 1894                 } else {
 1895                         return (0);
 1896                 }
 1897                 break;
 1898 #endif
 1899 #ifdef INET6
 1900         case AF_INET6:
 1901                 if (scope->ipv6_addr_legal) {
 1902                         struct sockaddr_in6 *sin6;
 1903 
 1904                         /*
 1905                          * Must update the flags,  bummer, which means any
 1906                          * IFA locks must now be applied HERE <->
 1907                          */
 1908                         if (do_update) {
 1909                                 sctp_gather_internal_ifa_flags(ifa);
 1910                         }
 1911                         if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 1912                                 return (0);
 1913                         }
 1914                         /* ok to use deprecated addresses? */
 1915                         sin6 = &ifa->address.sin6;
 1916                         if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 1917                                 /* skip unspecifed addresses */
 1918                                 return (0);
 1919                         }
 1920                         if (    /* (local_scope == 0) && */
 1921                             (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
 1922                                 return (0);
 1923                         }
 1924                         if ((scope->site_scope == 0) &&
 1925                             (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 1926                                 return (0);
 1927                         }
 1928                 } else {
 1929                         return (0);
 1930                 }
 1931                 break;
 1932 #endif
 1933         default:
 1934                 return (0);
 1935         }
 1936         return (1);
 1937 }
 1938 
 1939 static struct mbuf *
 1940 sctp_add_addr_to_mbuf(struct mbuf *m, struct sctp_ifa *ifa, uint16_t * len)
 1941 {
 1942 #if defined(INET) || defined(INET6)
 1943         struct sctp_paramhdr *parmh;
 1944         struct mbuf *mret;
 1945         uint16_t plen;
 1946 
 1947 #endif
 1948 
 1949         switch (ifa->address.sa.sa_family) {
 1950 #ifdef INET
 1951         case AF_INET:
 1952                 plen = (uint16_t) sizeof(struct sctp_ipv4addr_param);
 1953                 break;
 1954 #endif
 1955 #ifdef INET6
 1956         case AF_INET6:
 1957                 plen = (uint16_t) sizeof(struct sctp_ipv6addr_param);
 1958                 break;
 1959 #endif
 1960         default:
 1961                 return (m);
 1962         }
 1963 #if defined(INET) || defined(INET6)
 1964         if (M_TRAILINGSPACE(m) >= plen) {
 1965                 /* easy side we just drop it on the end */
 1966                 parmh = (struct sctp_paramhdr *)(SCTP_BUF_AT(m, SCTP_BUF_LEN(m)));
 1967                 mret = m;
 1968         } else {
 1969                 /* Need more space */
 1970                 mret = m;
 1971                 while (SCTP_BUF_NEXT(mret) != NULL) {
 1972                         mret = SCTP_BUF_NEXT(mret);
 1973                 }
 1974                 SCTP_BUF_NEXT(mret) = sctp_get_mbuf_for_msg(plen, 0, M_NOWAIT, 1, MT_DATA);
 1975                 if (SCTP_BUF_NEXT(mret) == NULL) {
 1976                         /* We are hosed, can't add more addresses */
 1977                         return (m);
 1978                 }
 1979                 mret = SCTP_BUF_NEXT(mret);
 1980                 parmh = mtod(mret, struct sctp_paramhdr *);
 1981         }
 1982         /* now add the parameter */
 1983         switch (ifa->address.sa.sa_family) {
 1984 #ifdef INET
 1985         case AF_INET:
 1986                 {
 1987                         struct sctp_ipv4addr_param *ipv4p;
 1988                         struct sockaddr_in *sin;
 1989 
 1990                         sin = &ifa->address.sin;
 1991                         ipv4p = (struct sctp_ipv4addr_param *)parmh;
 1992                         parmh->param_type = htons(SCTP_IPV4_ADDRESS);
 1993                         parmh->param_length = htons(plen);
 1994                         ipv4p->addr = sin->sin_addr.s_addr;
 1995                         SCTP_BUF_LEN(mret) += plen;
 1996                         break;
 1997                 }
 1998 #endif
 1999 #ifdef INET6
 2000         case AF_INET6:
 2001                 {
 2002                         struct sctp_ipv6addr_param *ipv6p;
 2003                         struct sockaddr_in6 *sin6;
 2004 
 2005                         sin6 = &ifa->address.sin6;
 2006                         ipv6p = (struct sctp_ipv6addr_param *)parmh;
 2007                         parmh->param_type = htons(SCTP_IPV6_ADDRESS);
 2008                         parmh->param_length = htons(plen);
 2009                         memcpy(ipv6p->addr, &sin6->sin6_addr,
 2010                             sizeof(ipv6p->addr));
 2011                         /* clear embedded scope in the address */
 2012                         in6_clearscope((struct in6_addr *)ipv6p->addr);
 2013                         SCTP_BUF_LEN(mret) += plen;
 2014                         break;
 2015                 }
 2016 #endif
 2017         default:
 2018                 return (m);
 2019         }
 2020         if (len != NULL) {
 2021                 *len += plen;
 2022         }
 2023         return (mret);
 2024 #endif
 2025 }
 2026 
 2027 
 2028 struct mbuf *
 2029 sctp_add_addresses_to_i_ia(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 2030     struct sctp_scoping *scope,
 2031     struct mbuf *m_at, int cnt_inits_to,
 2032     uint16_t * padding_len, uint16_t * chunk_len)
 2033 {
 2034         struct sctp_vrf *vrf = NULL;
 2035         int cnt, limit_out = 0, total_count;
 2036         uint32_t vrf_id;
 2037 
 2038         vrf_id = inp->def_vrf_id;
 2039         SCTP_IPI_ADDR_RLOCK();
 2040         vrf = sctp_find_vrf(vrf_id);
 2041         if (vrf == NULL) {
 2042                 SCTP_IPI_ADDR_RUNLOCK();
 2043                 return (m_at);
 2044         }
 2045         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 2046                 struct sctp_ifa *sctp_ifap;
 2047                 struct sctp_ifn *sctp_ifnp;
 2048 
 2049                 cnt = cnt_inits_to;
 2050                 if (vrf->total_ifa_count > SCTP_COUNT_LIMIT) {
 2051                         limit_out = 1;
 2052                         cnt = SCTP_ADDRESS_LIMIT;
 2053                         goto skip_count;
 2054                 }
 2055                 LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2056                         if ((scope->loopback_scope == 0) &&
 2057                             SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2058                                 /*
 2059                                  * Skip loopback devices if loopback_scope
 2060                                  * not set
 2061                                  */
 2062                                 continue;
 2063                         }
 2064                         LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2065 #ifdef INET
 2066                                 if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2067                                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2068                                     &sctp_ifap->address.sin.sin_addr) != 0)) {
 2069                                         continue;
 2070                                 }
 2071 #endif
 2072 #ifdef INET6
 2073                                 if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2074                                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2075                                     &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2076                                         continue;
 2077                                 }
 2078 #endif
 2079                                 if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2080                                         continue;
 2081                                 }
 2082                                 if (sctp_is_address_in_scope(sctp_ifap, scope, 1) == 0) {
 2083                                         continue;
 2084                                 }
 2085                                 cnt++;
 2086                                 if (cnt > SCTP_ADDRESS_LIMIT) {
 2087                                         break;
 2088                                 }
 2089                         }
 2090                         if (cnt > SCTP_ADDRESS_LIMIT) {
 2091                                 break;
 2092                         }
 2093                 }
 2094 skip_count:
 2095                 if (cnt > 1) {
 2096                         total_count = 0;
 2097                         LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
 2098                                 cnt = 0;
 2099                                 if ((scope->loopback_scope == 0) &&
 2100                                     SCTP_IFN_IS_IFT_LOOP(sctp_ifnp)) {
 2101                                         /*
 2102                                          * Skip loopback devices if
 2103                                          * loopback_scope not set
 2104                                          */
 2105                                         continue;
 2106                                 }
 2107                                 LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
 2108 #ifdef INET
 2109                                         if ((sctp_ifap->address.sa.sa_family == AF_INET) &&
 2110                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2111                                             &sctp_ifap->address.sin.sin_addr) != 0)) {
 2112                                                 continue;
 2113                                         }
 2114 #endif
 2115 #ifdef INET6
 2116                                         if ((sctp_ifap->address.sa.sa_family == AF_INET6) &&
 2117                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2118                                             &sctp_ifap->address.sin6.sin6_addr) != 0)) {
 2119                                                 continue;
 2120                                         }
 2121 #endif
 2122                                         if (sctp_is_addr_restricted(stcb, sctp_ifap)) {
 2123                                                 continue;
 2124                                         }
 2125                                         if (sctp_is_address_in_scope(sctp_ifap,
 2126                                             scope, 0) == 0) {
 2127                                                 continue;
 2128                                         }
 2129                                         if ((chunk_len != NULL) &&
 2130                                             (padding_len != NULL) &&
 2131                                             (*padding_len > 0)) {
 2132                                                 memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2133                                                 SCTP_BUF_LEN(m_at) += *padding_len;
 2134                                                 *chunk_len += *padding_len;
 2135                                                 *padding_len = 0;
 2136                                         }
 2137                                         m_at = sctp_add_addr_to_mbuf(m_at, sctp_ifap, chunk_len);
 2138                                         if (limit_out) {
 2139                                                 cnt++;
 2140                                                 total_count++;
 2141                                                 if (cnt >= 2) {
 2142                                                         /*
 2143                                                          * two from each
 2144                                                          * address
 2145                                                          */
 2146                                                         break;
 2147                                                 }
 2148                                                 if (total_count > SCTP_ADDRESS_LIMIT) {
 2149                                                         /* No more addresses */
 2150                                                         break;
 2151                                                 }
 2152                                         }
 2153                                 }
 2154                         }
 2155                 }
 2156         } else {
 2157                 struct sctp_laddr *laddr;
 2158 
 2159                 cnt = cnt_inits_to;
 2160                 /* First, how many ? */
 2161                 LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2162                         if (laddr->ifa == NULL) {
 2163                                 continue;
 2164                         }
 2165                         if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
 2166                                 /*
 2167                                  * Address being deleted by the system, dont
 2168                                  * list.
 2169                                  */
 2170                                 continue;
 2171                         if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2172                                 /*
 2173                                  * Address being deleted on this ep don't
 2174                                  * list.
 2175                                  */
 2176                                 continue;
 2177                         }
 2178                         if (sctp_is_address_in_scope(laddr->ifa,
 2179                             scope, 1) == 0) {
 2180                                 continue;
 2181                         }
 2182                         cnt++;
 2183                 }
 2184                 /*
 2185                  * To get through a NAT we only list addresses if we have
 2186                  * more than one. That way if you just bind a single address
 2187                  * we let the source of the init dictate our address.
 2188                  */
 2189                 if (cnt > 1) {
 2190                         cnt = cnt_inits_to;
 2191                         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2192                                 if (laddr->ifa == NULL) {
 2193                                         continue;
 2194                                 }
 2195                                 if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED) {
 2196                                         continue;
 2197                                 }
 2198                                 if (sctp_is_address_in_scope(laddr->ifa,
 2199                                     scope, 0) == 0) {
 2200                                         continue;
 2201                                 }
 2202                                 if ((chunk_len != NULL) &&
 2203                                     (padding_len != NULL) &&
 2204                                     (*padding_len > 0)) {
 2205                                         memset(mtod(m_at, caddr_t)+*chunk_len, 0, *padding_len);
 2206                                         SCTP_BUF_LEN(m_at) += *padding_len;
 2207                                         *chunk_len += *padding_len;
 2208                                         *padding_len = 0;
 2209                                 }
 2210                                 m_at = sctp_add_addr_to_mbuf(m_at, laddr->ifa, chunk_len);
 2211                                 cnt++;
 2212                                 if (cnt >= SCTP_ADDRESS_LIMIT) {
 2213                                         break;
 2214                                 }
 2215                         }
 2216                 }
 2217         }
 2218         SCTP_IPI_ADDR_RUNLOCK();
 2219         return (m_at);
 2220 }
 2221 
 2222 static struct sctp_ifa *
 2223 sctp_is_ifa_addr_preferred(struct sctp_ifa *ifa,
 2224     uint8_t dest_is_loop,
 2225     uint8_t dest_is_priv,
 2226     sa_family_t fam)
 2227 {
 2228         uint8_t dest_is_global = 0;
 2229 
 2230         /* dest_is_priv is true if destination is a private address */
 2231         /* dest_is_loop is true if destination is a loopback addresses */
 2232 
 2233         /**
 2234          * Here we determine if its a preferred address. A preferred address
 2235          * means it is the same scope or higher scope then the destination.
 2236          * L = loopback, P = private, G = global
 2237          * -----------------------------------------
 2238          *    src    |  dest | result
 2239          *  ----------------------------------------
 2240          *     L     |    L  |    yes
 2241          *  -----------------------------------------
 2242          *     P     |    L  |    yes-v4 no-v6
 2243          *  -----------------------------------------
 2244          *     G     |    L  |    yes-v4 no-v6
 2245          *  -----------------------------------------
 2246          *     L     |    P  |    no
 2247          *  -----------------------------------------
 2248          *     P     |    P  |    yes
 2249          *  -----------------------------------------
 2250          *     G     |    P  |    no
 2251          *   -----------------------------------------
 2252          *     L     |    G  |    no
 2253          *   -----------------------------------------
 2254          *     P     |    G  |    no
 2255          *    -----------------------------------------
 2256          *     G     |    G  |    yes
 2257          *    -----------------------------------------
 2258          */
 2259 
 2260         if (ifa->address.sa.sa_family != fam) {
 2261                 /* forget mis-matched family */
 2262                 return (NULL);
 2263         }
 2264         if ((dest_is_priv == 0) && (dest_is_loop == 0)) {
 2265                 dest_is_global = 1;
 2266         }
 2267         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Is destination preferred:");
 2268         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &ifa->address.sa);
 2269         /* Ok the address may be ok */
 2270 #ifdef INET6
 2271         if (fam == AF_INET6) {
 2272                 /* ok to use deprecated addresses? no lets not! */
 2273                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2274                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:1\n");
 2275                         return (NULL);
 2276                 }
 2277                 if (ifa->src_is_priv && !ifa->src_is_loop) {
 2278                         if (dest_is_loop) {
 2279                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:2\n");
 2280                                 return (NULL);
 2281                         }
 2282                 }
 2283                 if (ifa->src_is_glob) {
 2284                         if (dest_is_loop) {
 2285                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:3\n");
 2286                                 return (NULL);
 2287                         }
 2288                 }
 2289         }
 2290 #endif
 2291         /*
 2292          * Now that we know what is what, implement or table this could in
 2293          * theory be done slicker (it used to be), but this is
 2294          * straightforward and easier to validate :-)
 2295          */
 2296         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src_loop:%d src_priv:%d src_glob:%d\n",
 2297             ifa->src_is_loop, ifa->src_is_priv, ifa->src_is_glob);
 2298         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dest_loop:%d dest_priv:%d dest_glob:%d\n",
 2299             dest_is_loop, dest_is_priv, dest_is_global);
 2300 
 2301         if ((ifa->src_is_loop) && (dest_is_priv)) {
 2302                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:4\n");
 2303                 return (NULL);
 2304         }
 2305         if ((ifa->src_is_glob) && (dest_is_priv)) {
 2306                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:5\n");
 2307                 return (NULL);
 2308         }
 2309         if ((ifa->src_is_loop) && (dest_is_global)) {
 2310                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:6\n");
 2311                 return (NULL);
 2312         }
 2313         if ((ifa->src_is_priv) && (dest_is_global)) {
 2314                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "NO:7\n");
 2315                 return (NULL);
 2316         }
 2317         SCTPDBG(SCTP_DEBUG_OUTPUT3, "YES\n");
 2318         /* its a preferred address */
 2319         return (ifa);
 2320 }
 2321 
 2322 static struct sctp_ifa *
 2323 sctp_is_ifa_addr_acceptable(struct sctp_ifa *ifa,
 2324     uint8_t dest_is_loop,
 2325     uint8_t dest_is_priv,
 2326     sa_family_t fam)
 2327 {
 2328         uint8_t dest_is_global = 0;
 2329 
 2330         /**
 2331          * Here we determine if its a acceptable address. A acceptable
 2332          * address means it is the same scope or higher scope but we can
 2333          * allow for NAT which means its ok to have a global dest and a
 2334          * private src.
 2335          *
 2336          * L = loopback, P = private, G = global
 2337          * -----------------------------------------
 2338          *  src    |  dest | result
 2339          * -----------------------------------------
 2340          *   L     |   L   |    yes
 2341          *  -----------------------------------------
 2342          *   P     |   L   |    yes-v4 no-v6
 2343          *  -----------------------------------------
 2344          *   G     |   L   |    yes
 2345          * -----------------------------------------
 2346          *   L     |   P   |    no
 2347          * -----------------------------------------
 2348          *   P     |   P   |    yes
 2349          * -----------------------------------------
 2350          *   G     |   P   |    yes - May not work
 2351          * -----------------------------------------
 2352          *   L     |   G   |    no
 2353          * -----------------------------------------
 2354          *   P     |   G   |    yes - May not work
 2355          * -----------------------------------------
 2356          *   G     |   G   |    yes
 2357          * -----------------------------------------
 2358          */
 2359 
 2360         if (ifa->address.sa.sa_family != fam) {
 2361                 /* forget non matching family */
 2362                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa_fam:%d fam:%d\n",
 2363                     ifa->address.sa.sa_family, fam);
 2364                 return (NULL);
 2365         }
 2366         /* Ok the address may be ok */
 2367         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, &ifa->address.sa);
 2368         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst_is_loop:%d dest_is_priv:%d\n",
 2369             dest_is_loop, dest_is_priv);
 2370         if ((dest_is_loop == 0) && (dest_is_priv == 0)) {
 2371                 dest_is_global = 1;
 2372         }
 2373 #ifdef INET6
 2374         if (fam == AF_INET6) {
 2375                 /* ok to use deprecated addresses? */
 2376                 if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
 2377                         return (NULL);
 2378                 }
 2379                 if (ifa->src_is_priv) {
 2380                         /* Special case, linklocal to loop */
 2381                         if (dest_is_loop)
 2382                                 return (NULL);
 2383                 }
 2384         }
 2385 #endif
 2386         /*
 2387          * Now that we know what is what, implement our table. This could in
 2388          * theory be done slicker (it used to be), but this is
 2389          * straightforward and easier to validate :-)
 2390          */
 2391         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_priv:%d\n",
 2392             ifa->src_is_loop,
 2393             dest_is_priv);
 2394         if ((ifa->src_is_loop == 1) && (dest_is_priv)) {
 2395                 return (NULL);
 2396         }
 2397         SCTPDBG(SCTP_DEBUG_OUTPUT3, "ifa->src_is_loop:%d dest_is_glob:%d\n",
 2398             ifa->src_is_loop,
 2399             dest_is_global);
 2400         if ((ifa->src_is_loop == 1) && (dest_is_global)) {
 2401                 return (NULL);
 2402         }
 2403         SCTPDBG(SCTP_DEBUG_OUTPUT3, "address is acceptable\n");
 2404         /* its an acceptable address */
 2405         return (ifa);
 2406 }
 2407 
 2408 int
 2409 sctp_is_addr_restricted(struct sctp_tcb *stcb, struct sctp_ifa *ifa)
 2410 {
 2411         struct sctp_laddr *laddr;
 2412 
 2413         if (stcb == NULL) {
 2414                 /* There are no restrictions, no TCB :-) */
 2415                 return (0);
 2416         }
 2417         LIST_FOREACH(laddr, &stcb->asoc.sctp_restricted_addrs, sctp_nxt_addr) {
 2418                 if (laddr->ifa == NULL) {
 2419                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2420                             __func__);
 2421                         continue;
 2422                 }
 2423                 if (laddr->ifa == ifa) {
 2424                         /* Yes it is on the list */
 2425                         return (1);
 2426                 }
 2427         }
 2428         return (0);
 2429 }
 2430 
 2431 
 2432 int
 2433 sctp_is_addr_in_ep(struct sctp_inpcb *inp, struct sctp_ifa *ifa)
 2434 {
 2435         struct sctp_laddr *laddr;
 2436 
 2437         if (ifa == NULL)
 2438                 return (0);
 2439         LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
 2440                 if (laddr->ifa == NULL) {
 2441                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "%s: NULL ifa\n",
 2442                             __func__);
 2443                         continue;
 2444                 }
 2445                 if ((laddr->ifa == ifa) && laddr->action == 0)
 2446                         /* same pointer */
 2447                         return (1);
 2448         }
 2449         return (0);
 2450 }
 2451 
 2452 
 2453 
 2454 static struct sctp_ifa *
 2455 sctp_choose_boundspecific_inp(struct sctp_inpcb *inp,
 2456     sctp_route_t * ro,
 2457     uint32_t vrf_id,
 2458     int non_asoc_addr_ok,
 2459     uint8_t dest_is_priv,
 2460     uint8_t dest_is_loop,
 2461     sa_family_t fam)
 2462 {
 2463         struct sctp_laddr *laddr, *starting_point;
 2464         void *ifn;
 2465         int resettotop = 0;
 2466         struct sctp_ifn *sctp_ifn;
 2467         struct sctp_ifa *sctp_ifa, *sifa;
 2468         struct sctp_vrf *vrf;
 2469         uint32_t ifn_index;
 2470 
 2471         vrf = sctp_find_vrf(vrf_id);
 2472         if (vrf == NULL)
 2473                 return (NULL);
 2474 
 2475         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2476         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2477         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2478         /*
 2479          * first question, is the ifn we will emit on in our list, if so, we
 2480          * want such an address. Note that we first looked for a preferred
 2481          * address.
 2482          */
 2483         if (sctp_ifn) {
 2484                 /* is a preferred one on the interface we route out? */
 2485                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2486 #ifdef INET
 2487                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2488                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2489                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2490                                 continue;
 2491                         }
 2492 #endif
 2493 #ifdef INET6
 2494                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2495                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2496                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2497                                 continue;
 2498                         }
 2499 #endif
 2500                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2501                             (non_asoc_addr_ok == 0))
 2502                                 continue;
 2503                         sifa = sctp_is_ifa_addr_preferred(sctp_ifa,
 2504                             dest_is_loop,
 2505                             dest_is_priv, fam);
 2506                         if (sifa == NULL)
 2507                                 continue;
 2508                         if (sctp_is_addr_in_ep(inp, sifa)) {
 2509                                 atomic_add_int(&sifa->refcount, 1);
 2510                                 return (sifa);
 2511                         }
 2512                 }
 2513         }
 2514         /*
 2515          * ok, now we now need to find one on the list of the addresses. We
 2516          * can't get one on the emitting interface so let's find first a
 2517          * preferred one. If not that an acceptable one otherwise... we
 2518          * return NULL.
 2519          */
 2520         starting_point = inp->next_addr_touse;
 2521 once_again:
 2522         if (inp->next_addr_touse == NULL) {
 2523                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2524                 resettotop = 1;
 2525         }
 2526         for (laddr = inp->next_addr_touse; laddr;
 2527             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2528                 if (laddr->ifa == NULL) {
 2529                         /* address has been removed */
 2530                         continue;
 2531                 }
 2532                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2533                         /* address is being deleted */
 2534                         continue;
 2535                 }
 2536                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop,
 2537                     dest_is_priv, fam);
 2538                 if (sifa == NULL)
 2539                         continue;
 2540                 atomic_add_int(&sifa->refcount, 1);
 2541                 return (sifa);
 2542         }
 2543         if (resettotop == 0) {
 2544                 inp->next_addr_touse = NULL;
 2545                 goto once_again;
 2546         }
 2547         inp->next_addr_touse = starting_point;
 2548         resettotop = 0;
 2549 once_again_too:
 2550         if (inp->next_addr_touse == NULL) {
 2551                 inp->next_addr_touse = LIST_FIRST(&inp->sctp_addr_list);
 2552                 resettotop = 1;
 2553         }
 2554         /* ok, what about an acceptable address in the inp */
 2555         for (laddr = inp->next_addr_touse; laddr;
 2556             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2557                 if (laddr->ifa == NULL) {
 2558                         /* address has been removed */
 2559                         continue;
 2560                 }
 2561                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2562                         /* address is being deleted */
 2563                         continue;
 2564                 }
 2565                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2566                     dest_is_priv, fam);
 2567                 if (sifa == NULL)
 2568                         continue;
 2569                 atomic_add_int(&sifa->refcount, 1);
 2570                 return (sifa);
 2571         }
 2572         if (resettotop == 0) {
 2573                 inp->next_addr_touse = NULL;
 2574                 goto once_again_too;
 2575         }
 2576         /*
 2577          * no address bound can be a source for the destination we are in
 2578          * trouble
 2579          */
 2580         return (NULL);
 2581 }
 2582 
 2583 
 2584 
 2585 static struct sctp_ifa *
 2586 sctp_choose_boundspecific_stcb(struct sctp_inpcb *inp,
 2587     struct sctp_tcb *stcb,
 2588     sctp_route_t * ro,
 2589     uint32_t vrf_id,
 2590     uint8_t dest_is_priv,
 2591     uint8_t dest_is_loop,
 2592     int non_asoc_addr_ok,
 2593     sa_family_t fam)
 2594 {
 2595         struct sctp_laddr *laddr, *starting_point;
 2596         void *ifn;
 2597         struct sctp_ifn *sctp_ifn;
 2598         struct sctp_ifa *sctp_ifa, *sifa;
 2599         uint8_t start_at_beginning = 0;
 2600         struct sctp_vrf *vrf;
 2601         uint32_t ifn_index;
 2602 
 2603         /*
 2604          * first question, is the ifn we will emit on in our list, if so, we
 2605          * want that one.
 2606          */
 2607         vrf = sctp_find_vrf(vrf_id);
 2608         if (vrf == NULL)
 2609                 return (NULL);
 2610 
 2611         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2612         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2613         sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2614 
 2615         /*
 2616          * first question, is the ifn we will emit on in our list?  If so,
 2617          * we want that one. First we look for a preferred. Second, we go
 2618          * for an acceptable.
 2619          */
 2620         if (sctp_ifn) {
 2621                 /* first try for a preferred address on the ep */
 2622                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2623 #ifdef INET
 2624                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2625                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2626                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2627                                 continue;
 2628                         }
 2629 #endif
 2630 #ifdef INET6
 2631                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2632                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2633                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2634                                 continue;
 2635                         }
 2636 #endif
 2637                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2638                                 continue;
 2639                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2640                                 sifa = sctp_is_ifa_addr_preferred(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2641                                 if (sifa == NULL)
 2642                                         continue;
 2643                                 if (((non_asoc_addr_ok == 0) &&
 2644                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2645                                     (non_asoc_addr_ok &&
 2646                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2647                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2648                                         /* on the no-no list */
 2649                                         continue;
 2650                                 }
 2651                                 atomic_add_int(&sifa->refcount, 1);
 2652                                 return (sifa);
 2653                         }
 2654                 }
 2655                 /* next try for an acceptable address on the ep */
 2656                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 2657 #ifdef INET
 2658                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 2659                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2660                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 2661                                 continue;
 2662                         }
 2663 #endif
 2664 #ifdef INET6
 2665                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 2666                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2667                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 2668                                 continue;
 2669                         }
 2670 #endif
 2671                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) && (non_asoc_addr_ok == 0))
 2672                                 continue;
 2673                         if (sctp_is_addr_in_ep(inp, sctp_ifa)) {
 2674                                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop, dest_is_priv, fam);
 2675                                 if (sifa == NULL)
 2676                                         continue;
 2677                                 if (((non_asoc_addr_ok == 0) &&
 2678                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2679                                     (non_asoc_addr_ok &&
 2680                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2681                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2682                                         /* on the no-no list */
 2683                                         continue;
 2684                                 }
 2685                                 atomic_add_int(&sifa->refcount, 1);
 2686                                 return (sifa);
 2687                         }
 2688                 }
 2689 
 2690         }
 2691         /*
 2692          * if we can't find one like that then we must look at all addresses
 2693          * bound to pick one at first preferable then secondly acceptable.
 2694          */
 2695         starting_point = stcb->asoc.last_used_address;
 2696 sctp_from_the_top:
 2697         if (stcb->asoc.last_used_address == NULL) {
 2698                 start_at_beginning = 1;
 2699                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2700         }
 2701         /* search beginning with the last used address */
 2702         for (laddr = stcb->asoc.last_used_address; laddr;
 2703             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2704                 if (laddr->ifa == NULL) {
 2705                         /* address has been removed */
 2706                         continue;
 2707                 }
 2708                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2709                         /* address is being deleted */
 2710                         continue;
 2711                 }
 2712                 sifa = sctp_is_ifa_addr_preferred(laddr->ifa, dest_is_loop, dest_is_priv, fam);
 2713                 if (sifa == NULL)
 2714                         continue;
 2715                 if (((non_asoc_addr_ok == 0) &&
 2716                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2717                     (non_asoc_addr_ok &&
 2718                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2719                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2720                         /* on the no-no list */
 2721                         continue;
 2722                 }
 2723                 stcb->asoc.last_used_address = laddr;
 2724                 atomic_add_int(&sifa->refcount, 1);
 2725                 return (sifa);
 2726         }
 2727         if (start_at_beginning == 0) {
 2728                 stcb->asoc.last_used_address = NULL;
 2729                 goto sctp_from_the_top;
 2730         }
 2731         /* now try for any higher scope than the destination */
 2732         stcb->asoc.last_used_address = starting_point;
 2733         start_at_beginning = 0;
 2734 sctp_from_the_top2:
 2735         if (stcb->asoc.last_used_address == NULL) {
 2736                 start_at_beginning = 1;
 2737                 stcb->asoc.last_used_address = LIST_FIRST(&inp->sctp_addr_list);
 2738         }
 2739         /* search beginning with the last used address */
 2740         for (laddr = stcb->asoc.last_used_address; laddr;
 2741             laddr = LIST_NEXT(laddr, sctp_nxt_addr)) {
 2742                 if (laddr->ifa == NULL) {
 2743                         /* address has been removed */
 2744                         continue;
 2745                 }
 2746                 if (laddr->action == SCTP_DEL_IP_ADDRESS) {
 2747                         /* address is being deleted */
 2748                         continue;
 2749                 }
 2750                 sifa = sctp_is_ifa_addr_acceptable(laddr->ifa, dest_is_loop,
 2751                     dest_is_priv, fam);
 2752                 if (sifa == NULL)
 2753                         continue;
 2754                 if (((non_asoc_addr_ok == 0) &&
 2755                     (sctp_is_addr_restricted(stcb, sifa))) ||
 2756                     (non_asoc_addr_ok &&
 2757                     (sctp_is_addr_restricted(stcb, sifa)) &&
 2758                     (!sctp_is_addr_pending(stcb, sifa)))) {
 2759                         /* on the no-no list */
 2760                         continue;
 2761                 }
 2762                 stcb->asoc.last_used_address = laddr;
 2763                 atomic_add_int(&sifa->refcount, 1);
 2764                 return (sifa);
 2765         }
 2766         if (start_at_beginning == 0) {
 2767                 stcb->asoc.last_used_address = NULL;
 2768                 goto sctp_from_the_top2;
 2769         }
 2770         return (NULL);
 2771 }
 2772 
 2773 static struct sctp_ifa *
 2774 sctp_select_nth_preferred_addr_from_ifn_boundall(struct sctp_ifn *ifn,
 2775     struct sctp_inpcb *inp,
 2776     struct sctp_tcb *stcb,
 2777     int non_asoc_addr_ok,
 2778     uint8_t dest_is_loop,
 2779     uint8_t dest_is_priv,
 2780     int addr_wanted,
 2781     sa_family_t fam,
 2782     sctp_route_t * ro
 2783 )
 2784 {
 2785         struct sctp_ifa *ifa, *sifa;
 2786         int num_eligible_addr = 0;
 2787 
 2788 #ifdef INET6
 2789         struct sockaddr_in6 sin6, lsa6;
 2790 
 2791         if (fam == AF_INET6) {
 2792                 memcpy(&sin6, &ro->ro_dst, sizeof(struct sockaddr_in6));
 2793                 (void)sa6_recoverscope(&sin6);
 2794         }
 2795 #endif                          /* INET6 */
 2796         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2797 #ifdef INET
 2798                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2799                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2800                     &ifa->address.sin.sin_addr) != 0)) {
 2801                         continue;
 2802                 }
 2803 #endif
 2804 #ifdef INET6
 2805                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2806                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2807                     &ifa->address.sin6.sin6_addr) != 0)) {
 2808                         continue;
 2809                 }
 2810 #endif
 2811                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2812                     (non_asoc_addr_ok == 0))
 2813                         continue;
 2814                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2815                     dest_is_priv, fam);
 2816                 if (sifa == NULL)
 2817                         continue;
 2818 #ifdef INET6
 2819                 if (fam == AF_INET6 &&
 2820                     dest_is_loop &&
 2821                     sifa->src_is_loop && sifa->src_is_priv) {
 2822                         /*
 2823                          * don't allow fe80::1 to be a src on loop ::1, we
 2824                          * don't list it to the peer so we will get an
 2825                          * abort.
 2826                          */
 2827                         continue;
 2828                 }
 2829                 if (fam == AF_INET6 &&
 2830                     IN6_IS_ADDR_LINKLOCAL(&sifa->address.sin6.sin6_addr) &&
 2831                     IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
 2832                         /*
 2833                          * link-local <-> link-local must belong to the same
 2834                          * scope.
 2835                          */
 2836                         memcpy(&lsa6, &sifa->address.sin6, sizeof(struct sockaddr_in6));
 2837                         (void)sa6_recoverscope(&lsa6);
 2838                         if (sin6.sin6_scope_id != lsa6.sin6_scope_id) {
 2839                                 continue;
 2840                         }
 2841                 }
 2842 #endif                          /* INET6 */
 2843 
 2844                 /*
 2845                  * Check if the IPv6 address matches to next-hop. In the
 2846                  * mobile case, old IPv6 address may be not deleted from the
 2847                  * interface. Then, the interface has previous and new
 2848                  * addresses.  We should use one corresponding to the
 2849                  * next-hop.  (by micchie)
 2850                  */
 2851 #ifdef INET6
 2852                 if (stcb && fam == AF_INET6 &&
 2853                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2854                         if (sctp_v6src_match_nexthop(&sifa->address.sin6, ro)
 2855                             == 0) {
 2856                                 continue;
 2857                         }
 2858                 }
 2859 #endif
 2860 #ifdef INET
 2861                 /* Avoid topologically incorrect IPv4 address */
 2862                 if (stcb && fam == AF_INET &&
 2863                     sctp_is_mobility_feature_on(stcb->sctp_ep, SCTP_MOBILITY_BASE)) {
 2864                         if (sctp_v4src_match_nexthop(sifa, ro) == 0) {
 2865                                 continue;
 2866                         }
 2867                 }
 2868 #endif
 2869                 if (stcb) {
 2870                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2871                                 continue;
 2872                         }
 2873                         if (((non_asoc_addr_ok == 0) &&
 2874                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2875                             (non_asoc_addr_ok &&
 2876                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2877                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2878                                 /*
 2879                                  * It is restricted for some reason..
 2880                                  * probably not yet added.
 2881                                  */
 2882                                 continue;
 2883                         }
 2884                 }
 2885                 if (num_eligible_addr >= addr_wanted) {
 2886                         return (sifa);
 2887                 }
 2888                 num_eligible_addr++;
 2889         }
 2890         return (NULL);
 2891 }
 2892 
 2893 
 2894 static int
 2895 sctp_count_num_preferred_boundall(struct sctp_ifn *ifn,
 2896     struct sctp_inpcb *inp,
 2897     struct sctp_tcb *stcb,
 2898     int non_asoc_addr_ok,
 2899     uint8_t dest_is_loop,
 2900     uint8_t dest_is_priv,
 2901     sa_family_t fam)
 2902 {
 2903         struct sctp_ifa *ifa, *sifa;
 2904         int num_eligible_addr = 0;
 2905 
 2906         LIST_FOREACH(ifa, &ifn->ifalist, next_ifa) {
 2907 #ifdef INET
 2908                 if ((ifa->address.sa.sa_family == AF_INET) &&
 2909                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 2910                     &ifa->address.sin.sin_addr) != 0)) {
 2911                         continue;
 2912                 }
 2913 #endif
 2914 #ifdef INET6
 2915                 if ((ifa->address.sa.sa_family == AF_INET6) &&
 2916                     (stcb != NULL) &&
 2917                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 2918                     &ifa->address.sin6.sin6_addr) != 0)) {
 2919                         continue;
 2920                 }
 2921 #endif
 2922                 if ((ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 2923                     (non_asoc_addr_ok == 0)) {
 2924                         continue;
 2925                 }
 2926                 sifa = sctp_is_ifa_addr_preferred(ifa, dest_is_loop,
 2927                     dest_is_priv, fam);
 2928                 if (sifa == NULL) {
 2929                         continue;
 2930                 }
 2931                 if (stcb) {
 2932                         if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
 2933                                 continue;
 2934                         }
 2935                         if (((non_asoc_addr_ok == 0) &&
 2936                             (sctp_is_addr_restricted(stcb, sifa))) ||
 2937                             (non_asoc_addr_ok &&
 2938                             (sctp_is_addr_restricted(stcb, sifa)) &&
 2939                             (!sctp_is_addr_pending(stcb, sifa)))) {
 2940                                 /*
 2941                                  * It is restricted for some reason..
 2942                                  * probably not yet added.
 2943                                  */
 2944                                 continue;
 2945                         }
 2946                 }
 2947                 num_eligible_addr++;
 2948         }
 2949         return (num_eligible_addr);
 2950 }
 2951 
 2952 static struct sctp_ifa *
 2953 sctp_choose_boundall(struct sctp_inpcb *inp,
 2954     struct sctp_tcb *stcb,
 2955     struct sctp_nets *net,
 2956     sctp_route_t * ro,
 2957     uint32_t vrf_id,
 2958     uint8_t dest_is_priv,
 2959     uint8_t dest_is_loop,
 2960     int non_asoc_addr_ok,
 2961     sa_family_t fam)
 2962 {
 2963         int cur_addr_num = 0, num_preferred = 0;
 2964         void *ifn;
 2965         struct sctp_ifn *sctp_ifn, *looked_at = NULL, *emit_ifn;
 2966         struct sctp_ifa *sctp_ifa, *sifa;
 2967         uint32_t ifn_index;
 2968         struct sctp_vrf *vrf;
 2969 
 2970 #ifdef INET
 2971         int retried = 0;
 2972 
 2973 #endif
 2974 
 2975         /*-
 2976          * For boundall we can use any address in the association.
 2977          * If non_asoc_addr_ok is set we can use any address (at least in
 2978          * theory). So we look for preferred addresses first. If we find one,
 2979          * we use it. Otherwise we next try to get an address on the
 2980          * interface, which we should be able to do (unless non_asoc_addr_ok
 2981          * is false and we are routed out that way). In these cases where we
 2982          * can't use the address of the interface we go through all the
 2983          * ifn's looking for an address we can use and fill that in. Punting
 2984          * means we send back address 0, which will probably cause problems
 2985          * actually since then IP will fill in the address of the route ifn,
 2986          * which means we probably already rejected it.. i.e. here comes an
 2987          * abort :-<.
 2988          */
 2989         vrf = sctp_find_vrf(vrf_id);
 2990         if (vrf == NULL)
 2991                 return (NULL);
 2992 
 2993         ifn = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 2994         ifn_index = SCTP_GET_IF_INDEX_FROM_ROUTE(ro);
 2995         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn from route:%p ifn_index:%d\n", ifn, ifn_index);
 2996         emit_ifn = looked_at = sctp_ifn = sctp_find_ifn(ifn, ifn_index);
 2997         if (sctp_ifn == NULL) {
 2998                 /* ?? We don't have this guy ?? */
 2999                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No ifn emit interface?\n");
 3000                 goto bound_all_plan_b;
 3001         }
 3002         SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifn_index:%d name:%s is emit interface\n",
 3003             ifn_index, sctp_ifn->ifn_name);
 3004 
 3005         if (net) {
 3006                 cur_addr_num = net->indx_of_eligible_next_to_use;
 3007         }
 3008         num_preferred = sctp_count_num_preferred_boundall(sctp_ifn,
 3009             inp, stcb,
 3010             non_asoc_addr_ok,
 3011             dest_is_loop,
 3012             dest_is_priv, fam);
 3013         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Found %d preferred source addresses for intf:%s\n",
 3014             num_preferred, sctp_ifn->ifn_name);
 3015         if (num_preferred == 0) {
 3016                 /*
 3017                  * no eligible addresses, we must use some other interface
 3018                  * address if we can find one.
 3019                  */
 3020                 goto bound_all_plan_b;
 3021         }
 3022         /*
 3023          * Ok we have num_eligible_addr set with how many we can use, this
 3024          * may vary from call to call due to addresses being deprecated
 3025          * etc..
 3026          */
 3027         if (cur_addr_num >= num_preferred) {
 3028                 cur_addr_num = 0;
 3029         }
 3030         /*
 3031          * select the nth address from the list (where cur_addr_num is the
 3032          * nth) and 0 is the first one, 1 is the second one etc...
 3033          */
 3034         SCTPDBG(SCTP_DEBUG_OUTPUT2, "cur_addr_num:%d\n", cur_addr_num);
 3035 
 3036         sctp_ifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3037             dest_is_priv, cur_addr_num, fam, ro);
 3038 
 3039         /* if sctp_ifa is NULL something changed??, fall to plan b. */
 3040         if (sctp_ifa) {
 3041                 atomic_add_int(&sctp_ifa->refcount, 1);
 3042                 if (net) {
 3043                         /* save off where the next one we will want */
 3044                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3045                 }
 3046                 return (sctp_ifa);
 3047         }
 3048         /*
 3049          * plan_b: Look at all interfaces and find a preferred address. If
 3050          * no preferred fall through to plan_c.
 3051          */
 3052 bound_all_plan_b:
 3053         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan B\n");
 3054         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3055                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Examine interface %s\n",
 3056                     sctp_ifn->ifn_name);
 3057                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3058                         /* wrong base scope */
 3059                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "skip\n");
 3060                         continue;
 3061                 }
 3062                 if ((sctp_ifn == looked_at) && looked_at) {
 3063                         /* already looked at this guy */
 3064                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "already seen\n");
 3065                         continue;
 3066                 }
 3067                 num_preferred = sctp_count_num_preferred_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok,
 3068                     dest_is_loop, dest_is_priv, fam);
 3069                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3070                     "Found ifn:%p %d preferred source addresses\n",
 3071                     ifn, num_preferred);
 3072                 if (num_preferred == 0) {
 3073                         /* None on this interface. */
 3074                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefered -- skipping to next\n");
 3075                         continue;
 3076                 }
 3077                 SCTPDBG(SCTP_DEBUG_OUTPUT2,
 3078                     "num preferred:%d on interface:%p cur_addr_num:%d\n",
 3079                     num_preferred, (void *)sctp_ifn, cur_addr_num);
 3080 
 3081                 /*
 3082                  * Ok we have num_eligible_addr set with how many we can
 3083                  * use, this may vary from call to call due to addresses
 3084                  * being deprecated etc..
 3085                  */
 3086                 if (cur_addr_num >= num_preferred) {
 3087                         cur_addr_num = 0;
 3088                 }
 3089                 sifa = sctp_select_nth_preferred_addr_from_ifn_boundall(sctp_ifn, inp, stcb, non_asoc_addr_ok, dest_is_loop,
 3090                     dest_is_priv, cur_addr_num, fam, ro);
 3091                 if (sifa == NULL)
 3092                         continue;
 3093                 if (net) {
 3094                         net->indx_of_eligible_next_to_use = cur_addr_num + 1;
 3095                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "we selected %d\n",
 3096                             cur_addr_num);
 3097                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Source:");
 3098                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
 3099                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Dest:");
 3100                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &net->ro._l_addr.sa);
 3101                 }
 3102                 atomic_add_int(&sifa->refcount, 1);
 3103                 return (sifa);
 3104         }
 3105 #ifdef INET
 3106 again_with_private_addresses_allowed:
 3107 #endif
 3108         /* plan_c: do we have an acceptable address on the emit interface */
 3109         sifa = NULL;
 3110         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan C: find acceptable on interface\n");
 3111         if (emit_ifn == NULL) {
 3112                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jump to Plan D - no emit_ifn\n");
 3113                 goto plan_d;
 3114         }
 3115         LIST_FOREACH(sctp_ifa, &emit_ifn->ifalist, next_ifa) {
 3116                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "ifa:%p\n", (void *)sctp_ifa);
 3117 #ifdef INET
 3118                 if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3119                     (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3120                     &sctp_ifa->address.sin.sin_addr) != 0)) {
 3121                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3122                         continue;
 3123                 }
 3124 #endif
 3125 #ifdef INET6
 3126                 if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3127                     (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3128                     &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3129                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Jailed\n");
 3130                         continue;
 3131                 }
 3132 #endif
 3133                 if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3134                     (non_asoc_addr_ok == 0)) {
 3135                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Defer\n");
 3136                         continue;
 3137                 }
 3138                 sifa = sctp_is_ifa_addr_acceptable(sctp_ifa, dest_is_loop,
 3139                     dest_is_priv, fam);
 3140                 if (sifa == NULL) {
 3141                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "IFA not acceptable\n");
 3142                         continue;
 3143                 }
 3144                 if (stcb) {
 3145                         if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3146                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "NOT in scope\n");
 3147                                 sifa = NULL;
 3148                                 continue;
 3149                         }
 3150                         if (((non_asoc_addr_ok == 0) &&
 3151                             (sctp_is_addr_restricted(stcb, sifa))) ||
 3152                             (non_asoc_addr_ok &&
 3153                             (sctp_is_addr_restricted(stcb, sifa)) &&
 3154                             (!sctp_is_addr_pending(stcb, sifa)))) {
 3155                                 /*
 3156                                  * It is restricted for some reason..
 3157                                  * probably not yet added.
 3158                                  */
 3159                                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "Its resticted\n");
 3160                                 sifa = NULL;
 3161                                 continue;
 3162                         }
 3163                 }
 3164                 atomic_add_int(&sifa->refcount, 1);
 3165                 goto out;
 3166         }
 3167 plan_d:
 3168         /*
 3169          * plan_d: We are in trouble. No preferred address on the emit
 3170          * interface. And not even a preferred address on all interfaces. Go
 3171          * out and see if we can find an acceptable address somewhere
 3172          * amongst all interfaces.
 3173          */
 3174         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Trying Plan D looked_at is %p\n", (void *)looked_at);
 3175         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3176                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3177                         /* wrong base scope */
 3178                         continue;
 3179                 }
 3180                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3181 #ifdef INET
 3182                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3183                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3184                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3185                                 continue;
 3186                         }
 3187 #endif
 3188 #ifdef INET6
 3189                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3190                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3191                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3192                                 continue;
 3193                         }
 3194 #endif
 3195                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3196                             (non_asoc_addr_ok == 0))
 3197                                 continue;
 3198                         sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3199                             dest_is_loop,
 3200                             dest_is_priv, fam);
 3201                         if (sifa == NULL)
 3202                                 continue;
 3203                         if (stcb) {
 3204                                 if (sctp_is_address_in_scope(sifa, &stcb->asoc.scope, 0) == 0) {
 3205                                         sifa = NULL;
 3206                                         continue;
 3207                                 }
 3208                                 if (((non_asoc_addr_ok == 0) &&
 3209                                     (sctp_is_addr_restricted(stcb, sifa))) ||
 3210                                     (non_asoc_addr_ok &&
 3211                                     (sctp_is_addr_restricted(stcb, sifa)) &&
 3212                                     (!sctp_is_addr_pending(stcb, sifa)))) {
 3213                                         /*
 3214                                          * It is restricted for some
 3215                                          * reason.. probably not yet added.
 3216                                          */
 3217                                         sifa = NULL;
 3218                                         continue;
 3219                                 }
 3220                         }
 3221                         goto out;
 3222                 }
 3223         }
 3224 #ifdef INET
 3225         if (stcb) {
 3226                 if ((retried == 0) && (stcb->asoc.scope.ipv4_local_scope == 0)) {
 3227                         stcb->asoc.scope.ipv4_local_scope = 1;
 3228                         retried = 1;
 3229                         goto again_with_private_addresses_allowed;
 3230                 } else if (retried == 1) {
 3231                         stcb->asoc.scope.ipv4_local_scope = 0;
 3232                 }
 3233         }
 3234 #endif
 3235 out:
 3236 #ifdef INET
 3237         if (sifa) {
 3238                 if (retried == 1) {
 3239                         LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
 3240                                 if (dest_is_loop == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
 3241                                         /* wrong base scope */
 3242                                         continue;
 3243                                 }
 3244                                 LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
 3245                                         struct sctp_ifa *tmp_sifa;
 3246 
 3247 #ifdef INET
 3248                                         if ((sctp_ifa->address.sa.sa_family == AF_INET) &&
 3249                                             (prison_check_ip4(inp->ip_inp.inp.inp_cred,
 3250                                             &sctp_ifa->address.sin.sin_addr) != 0)) {
 3251                                                 continue;
 3252                                         }
 3253 #endif
 3254 #ifdef INET6
 3255                                         if ((sctp_ifa->address.sa.sa_family == AF_INET6) &&
 3256                                             (prison_check_ip6(inp->ip_inp.inp.inp_cred,
 3257                                             &sctp_ifa->address.sin6.sin6_addr) != 0)) {
 3258                                                 continue;
 3259                                         }
 3260 #endif
 3261                                         if ((sctp_ifa->localifa_flags & SCTP_ADDR_DEFER_USE) &&
 3262                                             (non_asoc_addr_ok == 0))
 3263                                                 continue;
 3264                                         tmp_sifa = sctp_is_ifa_addr_acceptable(sctp_ifa,
 3265                                             dest_is_loop,
 3266                                             dest_is_priv, fam);
 3267                                         if (tmp_sifa == NULL) {
 3268                                                 continue;
 3269                                         }
 3270                                         if (tmp_sifa == sifa) {
 3271                                                 continue;
 3272                                         }
 3273                                         if (stcb) {
 3274                                                 if (sctp_is_address_in_scope(tmp_sifa,
 3275                                                     &stcb->asoc.scope, 0) == 0) {
 3276                                                         continue;
 3277                                                 }
 3278                                                 if (((non_asoc_addr_ok == 0) &&
 3279                                                     (sctp_is_addr_restricted(stcb, tmp_sifa))) ||
 3280                                                     (non_asoc_addr_ok &&
 3281                                                     (sctp_is_addr_restricted(stcb, tmp_sifa)) &&
 3282                                                     (!sctp_is_addr_pending(stcb, tmp_sifa)))) {
 3283                                                         /*
 3284                                                          * It is restricted
 3285                                                          * for some reason..
 3286                                                          * probably not yet
 3287                                                          * added.
 3288                                                          */
 3289                                                         continue;
 3290                                                 }
 3291                                         }
 3292                                         if ((tmp_sifa->address.sin.sin_family == AF_INET) &&
 3293                                             (IN4_ISPRIVATE_ADDRESS(&(tmp_sifa->address.sin.sin_addr)))) {
 3294                                                 sctp_add_local_addr_restricted(stcb, tmp_sifa);
 3295                                         }
 3296                                 }
 3297                         }
 3298                 }
 3299                 atomic_add_int(&sifa->refcount, 1);
 3300         }
 3301 #endif
 3302         return (sifa);
 3303 }
 3304 
 3305 
 3306 
 3307 /* tcb may be NULL */
 3308 struct sctp_ifa *
 3309 sctp_source_address_selection(struct sctp_inpcb *inp,
 3310     struct sctp_tcb *stcb,
 3311     sctp_route_t * ro,
 3312     struct sctp_nets *net,
 3313     int non_asoc_addr_ok, uint32_t vrf_id)
 3314 {
 3315         struct sctp_ifa *answer;
 3316         uint8_t dest_is_priv, dest_is_loop;
 3317         sa_family_t fam;
 3318 
 3319 #ifdef INET
 3320         struct sockaddr_in *to = (struct sockaddr_in *)&ro->ro_dst;
 3321 
 3322 #endif
 3323 #ifdef INET6
 3324         struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&ro->ro_dst;
 3325 
 3326 #endif
 3327 
 3328         /**
 3329          * Rules: - Find the route if needed, cache if I can. - Look at
 3330          * interface address in route, Is it in the bound list. If so we
 3331          * have the best source. - If not we must rotate amongst the
 3332          * addresses.
 3333          *
 3334          * Cavets and issues
 3335          *
 3336          * Do we need to pay attention to scope. We can have a private address
 3337          * or a global address we are sourcing or sending to. So if we draw
 3338          * it out
 3339          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3340          * For V4
 3341          * ------------------------------------------
 3342          *      source     *      dest  *  result
 3343          * -----------------------------------------
 3344          * <a>  Private    *    Global  *  NAT
 3345          * -----------------------------------------
 3346          * <b>  Private    *    Private *  No problem
 3347          * -----------------------------------------
 3348          * <c>  Global     *    Private *  Huh, How will this work?
 3349          * -----------------------------------------
 3350          * <d>  Global     *    Global  *  No Problem
 3351          *------------------------------------------
 3352          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3353          * For V6
 3354          *------------------------------------------
 3355          *      source     *      dest  *  result
 3356          * -----------------------------------------
 3357          * <a>  Linklocal  *    Global  *
 3358          * -----------------------------------------
 3359          * <b>  Linklocal  * Linklocal  *  No problem
 3360          * -----------------------------------------
 3361          * <c>  Global     * Linklocal  *  Huh, How will this work?
 3362          * -----------------------------------------
 3363          * <d>  Global     *    Global  *  No Problem
 3364          *------------------------------------------
 3365          * zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
 3366          *
 3367          * And then we add to that what happens if there are multiple addresses
 3368          * assigned to an interface. Remember the ifa on a ifn is a linked
 3369          * list of addresses. So one interface can have more than one IP
 3370          * address. What happens if we have both a private and a global
 3371          * address? Do we then use context of destination to sort out which
 3372          * one is best? And what about NAT's sending P->G may get you a NAT
 3373          * translation, or should you select the G thats on the interface in
 3374          * preference.
 3375          *
 3376          * Decisions:
 3377          *
 3378          * - count the number of addresses on the interface.
 3379          * - if it is one, no problem except case <c>.
 3380          *   For <a> we will assume a NAT out there.
 3381          * - if there are more than one, then we need to worry about scope P
 3382          *   or G. We should prefer G -> G and P -> P if possible.
 3383          *   Then as a secondary fall back to mixed types G->P being a last
 3384          *   ditch one.
 3385          * - The above all works for bound all, but bound specific we need to
 3386          *   use the same concept but instead only consider the bound
 3387          *   addresses. If the bound set is NOT assigned to the interface then
 3388          *   we must use rotation amongst the bound addresses..
 3389          */
 3390         if (ro->ro_rt == NULL) {
 3391                 /*
 3392                  * Need a route to cache.
 3393                  */
 3394                 SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 3395         }
 3396         if (ro->ro_rt == NULL) {
 3397                 return (NULL);
 3398         }
 3399         fam = ro->ro_dst.sa_family;
 3400         dest_is_priv = dest_is_loop = 0;
 3401         /* Setup our scopes for the destination */
 3402         switch (fam) {
 3403 #ifdef INET
 3404         case AF_INET:
 3405                 /* Scope based on outbound address */
 3406                 if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
 3407                         dest_is_loop = 1;
 3408                         if (net != NULL) {
 3409                                 /* mark it as local */
 3410                                 net->addr_is_local = 1;
 3411                         }
 3412                 } else if ((IN4_ISPRIVATE_ADDRESS(&to->sin_addr))) {
 3413                         dest_is_priv = 1;
 3414                 }
 3415                 break;
 3416 #endif
 3417 #ifdef INET6
 3418         case AF_INET6:
 3419                 /* Scope based on outbound address */
 3420                 if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr) ||
 3421                     SCTP_ROUTE_IS_REAL_LOOP(ro)) {
 3422                         /*
 3423                          * If the address is a loopback address, which
 3424                          * consists of "::1" OR "fe80::1%lo0", we are
 3425                          * loopback scope. But we don't use dest_is_priv
 3426                          * (link local addresses).
 3427                          */
 3428                         dest_is_loop = 1;
 3429                         if (net != NULL) {
 3430                                 /* mark it as local */
 3431                                 net->addr_is_local = 1;
 3432                         }
 3433                 } else if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
 3434                         dest_is_priv = 1;
 3435                 }
 3436                 break;
 3437 #endif
 3438         }
 3439         SCTPDBG(SCTP_DEBUG_OUTPUT2, "Select source addr for:");
 3440         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&ro->ro_dst);
 3441         SCTP_IPI_ADDR_RLOCK();
 3442         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
 3443                 /*
 3444                  * Bound all case
 3445                  */
 3446                 answer = sctp_choose_boundall(inp, stcb, net, ro, vrf_id,
 3447                     dest_is_priv, dest_is_loop,
 3448                     non_asoc_addr_ok, fam);
 3449                 SCTP_IPI_ADDR_RUNLOCK();
 3450                 return (answer);
 3451         }
 3452         /*
 3453          * Subset bound case
 3454          */
 3455         if (stcb) {
 3456                 answer = sctp_choose_boundspecific_stcb(inp, stcb, ro,
 3457                     vrf_id, dest_is_priv,
 3458                     dest_is_loop,
 3459                     non_asoc_addr_ok, fam);
 3460         } else {
 3461                 answer = sctp_choose_boundspecific_inp(inp, ro, vrf_id,
 3462                     non_asoc_addr_ok,
 3463                     dest_is_priv,
 3464                     dest_is_loop, fam);
 3465         }
 3466         SCTP_IPI_ADDR_RUNLOCK();
 3467         return (answer);
 3468 }
 3469 
 3470 static int
 3471 sctp_find_cmsg(int c_type, void *data, struct mbuf *control, size_t cpsize)
 3472 {
 3473         struct cmsghdr cmh;
 3474         int tlen, at, found;
 3475         struct sctp_sndinfo sndinfo;
 3476         struct sctp_prinfo prinfo;
 3477         struct sctp_authinfo authinfo;
 3478 
 3479         tlen = SCTP_BUF_LEN(control);
 3480         at = 0;
 3481         found = 0;
 3482         /*
 3483          * Independent of how many mbufs, find the c_type inside the control
 3484          * structure and copy out the data.
 3485          */
 3486         while (at < tlen) {
 3487                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3488                         /* There is not enough room for one more. */
 3489                         return (found);
 3490                 }
 3491                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3492                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3493                         /* We dont't have a complete CMSG header. */
 3494                         return (found);
 3495                 }
 3496                 if (((int)cmh.cmsg_len + at) > tlen) {
 3497                         /* We don't have the complete CMSG. */
 3498                         return (found);
 3499                 }
 3500                 if ((cmh.cmsg_level == IPPROTO_SCTP) &&
 3501                     ((c_type == cmh.cmsg_type) ||
 3502                     ((c_type == SCTP_SNDRCV) &&
 3503                     ((cmh.cmsg_type == SCTP_SNDINFO) ||
 3504                     (cmh.cmsg_type == SCTP_PRINFO) ||
 3505                     (cmh.cmsg_type == SCTP_AUTHINFO))))) {
 3506                         if (c_type == cmh.cmsg_type) {
 3507                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < cpsize) {
 3508                                         return (found);
 3509                                 }
 3510                                 /* It is exactly what we want. Copy it out. */
 3511                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), cpsize, (caddr_t)data);
 3512                                 return (1);
 3513                         } else {
 3514                                 struct sctp_sndrcvinfo *sndrcvinfo;
 3515 
 3516                                 sndrcvinfo = (struct sctp_sndrcvinfo *)data;
 3517                                 if (found == 0) {
 3518                                         if (cpsize < sizeof(struct sctp_sndrcvinfo)) {
 3519                                                 return (found);
 3520                                         }
 3521                                         memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
 3522                                 }
 3523                                 switch (cmh.cmsg_type) {
 3524                                 case SCTP_SNDINFO:
 3525                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_sndinfo)) {
 3526                                                 return (found);
 3527                                         }
 3528                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_sndinfo), (caddr_t)&sndinfo);
 3529                                         sndrcvinfo->sinfo_stream = sndinfo.snd_sid;
 3530                                         sndrcvinfo->sinfo_flags = sndinfo.snd_flags;
 3531                                         sndrcvinfo->sinfo_ppid = sndinfo.snd_ppid;
 3532                                         sndrcvinfo->sinfo_context = sndinfo.snd_context;
 3533                                         sndrcvinfo->sinfo_assoc_id = sndinfo.snd_assoc_id;
 3534                                         break;
 3535                                 case SCTP_PRINFO:
 3536                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_prinfo)) {
 3537                                                 return (found);
 3538                                         }
 3539                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_prinfo), (caddr_t)&prinfo);
 3540                                         if (prinfo.pr_policy != SCTP_PR_SCTP_NONE) {
 3541                                                 sndrcvinfo->sinfo_timetolive = prinfo.pr_value;
 3542                                         } else {
 3543                                                 sndrcvinfo->sinfo_timetolive = 0;
 3544                                         }
 3545                                         sndrcvinfo->sinfo_flags |= prinfo.pr_policy;
 3546                                         break;
 3547                                 case SCTP_AUTHINFO:
 3548                                         if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_authinfo)) {
 3549                                                 return (found);
 3550                                         }
 3551                                         m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_authinfo), (caddr_t)&authinfo);
 3552                                         sndrcvinfo->sinfo_keynumber_valid = 1;
 3553                                         sndrcvinfo->sinfo_keynumber = authinfo.auth_keynumber;
 3554                                         break;
 3555                                 default:
 3556                                         return (found);
 3557                                 }
 3558                                 found = 1;
 3559                         }
 3560                 }
 3561                 at += CMSG_ALIGN(cmh.cmsg_len);
 3562         }
 3563         return (found);
 3564 }
 3565 
 3566 static int
 3567 sctp_process_cmsgs_for_init(struct sctp_tcb *stcb, struct mbuf *control, int *error)
 3568 {
 3569         struct cmsghdr cmh;
 3570         int tlen, at;
 3571         struct sctp_initmsg initmsg;
 3572 
 3573 #ifdef INET
 3574         struct sockaddr_in sin;
 3575 
 3576 #endif
 3577 #ifdef INET6
 3578         struct sockaddr_in6 sin6;
 3579 
 3580 #endif
 3581 
 3582         tlen = SCTP_BUF_LEN(control);
 3583         at = 0;
 3584         while (at < tlen) {
 3585                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3586                         /* There is not enough room for one more. */
 3587                         *error = EINVAL;
 3588                         return (1);
 3589                 }
 3590                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3591                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3592                         /* We dont't have a complete CMSG header. */
 3593                         *error = EINVAL;
 3594                         return (1);
 3595                 }
 3596                 if (((int)cmh.cmsg_len + at) > tlen) {
 3597                         /* We don't have the complete CMSG. */
 3598                         *error = EINVAL;
 3599                         return (1);
 3600                 }
 3601                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3602                         switch (cmh.cmsg_type) {
 3603                         case SCTP_INIT:
 3604                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct sctp_initmsg)) {
 3605                                         *error = EINVAL;
 3606                                         return (1);
 3607                                 }
 3608                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct sctp_initmsg), (caddr_t)&initmsg);
 3609                                 if (initmsg.sinit_max_attempts)
 3610                                         stcb->asoc.max_init_times = initmsg.sinit_max_attempts;
 3611                                 if (initmsg.sinit_num_ostreams)
 3612                                         stcb->asoc.pre_open_streams = initmsg.sinit_num_ostreams;
 3613                                 if (initmsg.sinit_max_instreams)
 3614                                         stcb->asoc.max_inbound_streams = initmsg.sinit_max_instreams;
 3615                                 if (initmsg.sinit_max_init_timeo)
 3616                                         stcb->asoc.initial_init_rto_max = initmsg.sinit_max_init_timeo;
 3617                                 if (stcb->asoc.streamoutcnt < stcb->asoc.pre_open_streams) {
 3618                                         struct sctp_stream_out *tmp_str;
 3619                                         unsigned int i;
 3620 
 3621 #if defined(SCTP_DETAILED_STR_STATS)
 3622                                         int j;
 3623 
 3624 #endif
 3625 
 3626                                         /* Default is NOT correct */
 3627                                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, default:%d pre_open:%d\n",
 3628                                             stcb->asoc.streamoutcnt, stcb->asoc.pre_open_streams);
 3629                                         SCTP_TCB_UNLOCK(stcb);
 3630                                         SCTP_MALLOC(tmp_str,
 3631                                             struct sctp_stream_out *,
 3632                                             (stcb->asoc.pre_open_streams * sizeof(struct sctp_stream_out)),
 3633                                             SCTP_M_STRMO);
 3634                                         SCTP_TCB_LOCK(stcb);
 3635                                         if (tmp_str != NULL) {
 3636                                                 SCTP_FREE(stcb->asoc.strmout, SCTP_M_STRMO);
 3637                                                 stcb->asoc.strmout = tmp_str;
 3638                                                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt = stcb->asoc.pre_open_streams;
 3639                                         } else {
 3640                                                 stcb->asoc.pre_open_streams = stcb->asoc.streamoutcnt;
 3641                                         }
 3642                                         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 3643                                                 TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
 3644                                                 stcb->asoc.strmout[i].chunks_on_queues = 0;
 3645                                                 stcb->asoc.strmout[i].next_sequence_send = 0;
 3646 #if defined(SCTP_DETAILED_STR_STATS)
 3647                                                 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
 3648                                                         stcb->asoc.strmout[i].abandoned_sent[j] = 0;
 3649                                                         stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
 3650                                                 }
 3651 #else
 3652                                                 stcb->asoc.strmout[i].abandoned_sent[0] = 0;
 3653                                                 stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
 3654 #endif
 3655                                                 stcb->asoc.strmout[i].stream_no = i;
 3656                                                 stcb->asoc.strmout[i].last_msg_incomplete = 0;
 3657                                                 stcb->asoc.strmout[i].state = SCTP_STREAM_OPENING;
 3658                                                 stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
 3659                                         }
 3660                                 }
 3661                                 break;
 3662 #ifdef INET
 3663                         case SCTP_DSTADDRV4:
 3664                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
 3665                                         *error = EINVAL;
 3666                                         return (1);
 3667                                 }
 3668                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3669                                 sin.sin_family = AF_INET;
 3670                                 sin.sin_len = sizeof(struct sockaddr_in);
 3671                                 sin.sin_port = stcb->rport;
 3672                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3673                                 if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3674                                     (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3675                                     IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3676                                         *error = EINVAL;
 3677                                         return (1);
 3678                                 }
 3679                                 if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
 3680                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3681                                         *error = ENOBUFS;
 3682                                         return (1);
 3683                                 }
 3684                                 break;
 3685 #endif
 3686 #ifdef INET6
 3687                         case SCTP_DSTADDRV6:
 3688                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
 3689                                         *error = EINVAL;
 3690                                         return (1);
 3691                                 }
 3692                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3693                                 sin6.sin6_family = AF_INET6;
 3694                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3695                                 sin6.sin6_port = stcb->rport;
 3696                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3697                                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) ||
 3698                                     IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr)) {
 3699                                         *error = EINVAL;
 3700                                         return (1);
 3701                                 }
 3702 #ifdef INET
 3703                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3704                                         in6_sin6_2_sin(&sin, &sin6);
 3705                                         if ((sin.sin_addr.s_addr == INADDR_ANY) ||
 3706                                             (sin.sin_addr.s_addr == INADDR_BROADCAST) ||
 3707                                             IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) {
 3708                                                 *error = EINVAL;
 3709                                                 return (1);
 3710                                         }
 3711                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin, NULL,
 3712                                             SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3713                                                 *error = ENOBUFS;
 3714                                                 return (1);
 3715                                         }
 3716                                 } else
 3717 #endif
 3718                                         if (sctp_add_remote_addr(stcb, (struct sockaddr *)&sin6, NULL,
 3719                                     SCTP_DONOT_SETSCOPE, SCTP_ADDR_IS_CONFIRMED)) {
 3720                                         *error = ENOBUFS;
 3721                                         return (1);
 3722                                 }
 3723                                 break;
 3724 #endif
 3725                         default:
 3726                                 break;
 3727                         }
 3728                 }
 3729                 at += CMSG_ALIGN(cmh.cmsg_len);
 3730         }
 3731         return (0);
 3732 }
 3733 
 3734 static struct sctp_tcb *
 3735 sctp_findassociation_cmsgs(struct sctp_inpcb **inp_p,
 3736     uint16_t port,
 3737     struct mbuf *control,
 3738     struct sctp_nets **net_p,
 3739     int *error)
 3740 {
 3741         struct cmsghdr cmh;
 3742         int tlen, at;
 3743         struct sctp_tcb *stcb;
 3744         struct sockaddr *addr;
 3745 
 3746 #ifdef INET
 3747         struct sockaddr_in sin;
 3748 
 3749 #endif
 3750 #ifdef INET6
 3751         struct sockaddr_in6 sin6;
 3752 
 3753 #endif
 3754 
 3755         tlen = SCTP_BUF_LEN(control);
 3756         at = 0;
 3757         while (at < tlen) {
 3758                 if ((tlen - at) < (int)CMSG_ALIGN(sizeof(cmh))) {
 3759                         /* There is not enough room for one more. */
 3760                         *error = EINVAL;
 3761                         return (NULL);
 3762                 }
 3763                 m_copydata(control, at, sizeof(cmh), (caddr_t)&cmh);
 3764                 if (cmh.cmsg_len < CMSG_ALIGN(sizeof(cmh))) {
 3765                         /* We dont't have a complete CMSG header. */
 3766                         *error = EINVAL;
 3767                         return (NULL);
 3768                 }
 3769                 if (((int)cmh.cmsg_len + at) > tlen) {
 3770                         /* We don't have the complete CMSG. */
 3771                         *error = EINVAL;
 3772                         return (NULL);
 3773                 }
 3774                 if (cmh.cmsg_level == IPPROTO_SCTP) {
 3775                         switch (cmh.cmsg_type) {
 3776 #ifdef INET
 3777                         case SCTP_DSTADDRV4:
 3778                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in_addr)) {
 3779                                         *error = EINVAL;
 3780                                         return (NULL);
 3781                                 }
 3782                                 memset(&sin, 0, sizeof(struct sockaddr_in));
 3783                                 sin.sin_family = AF_INET;
 3784                                 sin.sin_len = sizeof(struct sockaddr_in);
 3785                                 sin.sin_port = port;
 3786                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in_addr), (caddr_t)&sin.sin_addr);
 3787                                 addr = (struct sockaddr *)&sin;
 3788                                 break;
 3789 #endif
 3790 #ifdef INET6
 3791                         case SCTP_DSTADDRV6:
 3792                                 if ((size_t)(cmh.cmsg_len - CMSG_ALIGN(sizeof(cmh))) < sizeof(struct in6_addr)) {
 3793                                         *error = EINVAL;
 3794                                         return (NULL);
 3795                                 }
 3796                                 memset(&sin6, 0, sizeof(struct sockaddr_in6));
 3797                                 sin6.sin6_family = AF_INET6;
 3798                                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 3799                                 sin6.sin6_port = port;
 3800                                 m_copydata(control, at + CMSG_ALIGN(sizeof(cmh)), sizeof(struct in6_addr), (caddr_t)&sin6.sin6_addr);
 3801 #ifdef INET
 3802                                 if (IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) {
 3803                                         in6_sin6_2_sin(&sin, &sin6);
 3804                                         addr = (struct sockaddr *)&sin;
 3805                                 } else
 3806 #endif
 3807                                         addr = (struct sockaddr *)&sin6;
 3808                                 break;
 3809 #endif
 3810                         default:
 3811                                 addr = NULL;
 3812                                 break;
 3813                         }
 3814                         if (addr) {
 3815                                 stcb = sctp_findassociation_ep_addr(inp_p, addr, net_p, NULL, NULL);
 3816                                 if (stcb != NULL) {
 3817                                         return (stcb);
 3818                                 }
 3819                         }
 3820                 }
 3821                 at += CMSG_ALIGN(cmh.cmsg_len);
 3822         }
 3823         return (NULL);
 3824 }
 3825 
 3826 static struct mbuf *
 3827 sctp_add_cookie(struct mbuf *init, int init_offset,
 3828     struct mbuf *initack, int initack_offset, struct sctp_state_cookie *stc_in, uint8_t ** signature)
 3829 {
 3830         struct mbuf *copy_init, *copy_initack, *m_at, *sig, *mret;
 3831         struct sctp_state_cookie *stc;
 3832         struct sctp_paramhdr *ph;
 3833         uint8_t *foo;
 3834         int sig_offset;
 3835         uint16_t cookie_sz;
 3836 
 3837         mret = sctp_get_mbuf_for_msg((sizeof(struct sctp_state_cookie) +
 3838             sizeof(struct sctp_paramhdr)), 0,
 3839             M_NOWAIT, 1, MT_DATA);
 3840         if (mret == NULL) {
 3841                 return (NULL);
 3842         }
 3843         copy_init = SCTP_M_COPYM(init, init_offset, M_COPYALL, M_NOWAIT);
 3844         if (copy_init == NULL) {
 3845                 sctp_m_freem(mret);
 3846                 return (NULL);
 3847         }
 3848 #ifdef SCTP_MBUF_LOGGING
 3849         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3850                 sctp_log_mbc(copy_init, SCTP_MBUF_ICOPY);
 3851         }
 3852 #endif
 3853         copy_initack = SCTP_M_COPYM(initack, initack_offset, M_COPYALL,
 3854             M_NOWAIT);
 3855         if (copy_initack == NULL) {
 3856                 sctp_m_freem(mret);
 3857                 sctp_m_freem(copy_init);
 3858                 return (NULL);
 3859         }
 3860 #ifdef SCTP_MBUF_LOGGING
 3861         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 3862                 sctp_log_mbc(copy_initack, SCTP_MBUF_ICOPY);
 3863         }
 3864 #endif
 3865         /* easy side we just drop it on the end */
 3866         ph = mtod(mret, struct sctp_paramhdr *);
 3867         SCTP_BUF_LEN(mret) = sizeof(struct sctp_state_cookie) +
 3868             sizeof(struct sctp_paramhdr);
 3869         stc = (struct sctp_state_cookie *)((caddr_t)ph +
 3870             sizeof(struct sctp_paramhdr));
 3871         ph->param_type = htons(SCTP_STATE_COOKIE);
 3872         ph->param_length = 0;   /* fill in at the end */
 3873         /* Fill in the stc cookie data */
 3874         memcpy(stc, stc_in, sizeof(struct sctp_state_cookie));
 3875 
 3876         /* tack the INIT and then the INIT-ACK onto the chain */
 3877         cookie_sz = 0;
 3878         for (m_at = mret; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3879                 cookie_sz += SCTP_BUF_LEN(m_at);
 3880                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3881                         SCTP_BUF_NEXT(m_at) = copy_init;
 3882                         break;
 3883                 }
 3884         }
 3885         for (m_at = copy_init; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3886                 cookie_sz += SCTP_BUF_LEN(m_at);
 3887                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3888                         SCTP_BUF_NEXT(m_at) = copy_initack;
 3889                         break;
 3890                 }
 3891         }
 3892         for (m_at = copy_initack; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
 3893                 cookie_sz += SCTP_BUF_LEN(m_at);
 3894                 if (SCTP_BUF_NEXT(m_at) == NULL) {
 3895                         break;
 3896                 }
 3897         }
 3898         sig = sctp_get_mbuf_for_msg(SCTP_SECRET_SIZE, 0, M_NOWAIT, 1, MT_DATA);
 3899         if (sig == NULL) {
 3900                 /* no space, so free the entire chain */
 3901                 sctp_m_freem(mret);
 3902                 return (NULL);
 3903         }
 3904         SCTP_BUF_LEN(sig) = 0;
 3905         SCTP_BUF_NEXT(m_at) = sig;
 3906         sig_offset = 0;
 3907         foo = (uint8_t *) (mtod(sig, caddr_t)+sig_offset);
 3908         memset(foo, 0, SCTP_SIGNATURE_SIZE);
 3909         *signature = foo;
 3910         SCTP_BUF_LEN(sig) += SCTP_SIGNATURE_SIZE;
 3911         cookie_sz += SCTP_SIGNATURE_SIZE;
 3912         ph->param_length = htons(cookie_sz);
 3913         return (mret);
 3914 }
 3915 
 3916 
 3917 static uint8_t
 3918 sctp_get_ect(struct sctp_tcb *stcb)
 3919 {
 3920         if ((stcb != NULL) && (stcb->asoc.ecn_supported == 1)) {
 3921                 return (SCTP_ECT0_BIT);
 3922         } else {
 3923                 return (0);
 3924         }
 3925 }
 3926 
 3927 #if defined(INET) || defined(INET6)
 3928 static void
 3929 sctp_handle_no_route(struct sctp_tcb *stcb,
 3930     struct sctp_nets *net,
 3931     int so_locked)
 3932 {
 3933         SCTPDBG(SCTP_DEBUG_OUTPUT1, "dropped packet - no valid source addr\n");
 3934 
 3935         if (net) {
 3936                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Destination was ");
 3937                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT1, &net->ro._l_addr.sa);
 3938                 if (net->dest_state & SCTP_ADDR_CONFIRMED) {
 3939                         if ((net->dest_state & SCTP_ADDR_REACHABLE) && stcb) {
 3940                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "no route takes interface %p down\n", (void *)net);
 3941                                 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
 3942                                     stcb, 0,
 3943                                     (void *)net,
 3944                                     so_locked);
 3945                                 net->dest_state &= ~SCTP_ADDR_REACHABLE;
 3946                                 net->dest_state &= ~SCTP_ADDR_PF;
 3947                         }
 3948                 }
 3949                 if (stcb) {
 3950                         if (net == stcb->asoc.primary_destination) {
 3951                                 /* need a new primary */
 3952                                 struct sctp_nets *alt;
 3953 
 3954                                 alt = sctp_find_alternate_net(stcb, net, 0);
 3955                                 if (alt != net) {
 3956                                         if (stcb->asoc.alternate) {
 3957                                                 sctp_free_remote_addr(stcb->asoc.alternate);
 3958                                         }
 3959                                         stcb->asoc.alternate = alt;
 3960                                         atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
 3961                                         if (net->ro._s_addr) {
 3962                                                 sctp_free_ifa(net->ro._s_addr);
 3963                                                 net->ro._s_addr = NULL;
 3964                                         }
 3965                                         net->src_addr_selected = 0;
 3966                                 }
 3967                         }
 3968                 }
 3969         }
 3970 }
 3971 
 3972 #endif
 3973 
 3974 static int
 3975 sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
 3976     struct sctp_tcb *stcb,      /* may be NULL */
 3977     struct sctp_nets *net,
 3978     struct sockaddr *to,
 3979     struct mbuf *m,
 3980     uint32_t auth_offset,
 3981     struct sctp_auth_chunk *auth,
 3982     uint16_t auth_keyid,
 3983     int nofragment_flag,
 3984     int ecn_ok,
 3985     int out_of_asoc_ok,
 3986     uint16_t src_port,
 3987     uint16_t dest_port,
 3988     uint32_t v_tag,
 3989     uint16_t port,
 3990     union sctp_sockstore *over_addr,
 3991     uint8_t mflowtype, uint32_t mflowid,
 3992 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 3993     int so_locked SCTP_UNUSED
 3994 #else
 3995     int so_locked
 3996 #endif
 3997 )
 3998 /* nofragment_flag to tell if IP_DF should be set (IPv4 only) */
 3999 {
 4000         /**
 4001          * Given a mbuf chain (via SCTP_BUF_NEXT()) that holds a packet header
 4002          * WITH an SCTPHDR but no IP header, endpoint inp and sa structure:
 4003          * - fill in the HMAC digest of any AUTH chunk in the packet.
 4004          * - calculate and fill in the SCTP checksum.
 4005          * - prepend an IP address header.
 4006          * - if boundall use INADDR_ANY.
 4007          * - if boundspecific do source address selection.
 4008          * - set fragmentation option for ipV4.
 4009          * - On return from IP output, check/adjust mtu size of output
 4010          *   interface and smallest_mtu size as well.
 4011          */
 4012         /* Will need ifdefs around this */
 4013         struct mbuf *newm;
 4014         struct sctphdr *sctphdr;
 4015         int packet_length;
 4016         int ret;
 4017 
 4018 #if defined(INET) || defined(INET6)
 4019         uint32_t vrf_id;
 4020 
 4021 #endif
 4022 #if defined(INET) || defined(INET6)
 4023         struct mbuf *o_pak;
 4024         sctp_route_t *ro = NULL;
 4025         struct udphdr *udp = NULL;
 4026 
 4027 #endif
 4028         uint8_t tos_value;
 4029 
 4030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4031         struct socket *so = NULL;
 4032 
 4033 #endif
 4034 
 4035         if ((net) && (net->dest_state & SCTP_ADDR_OUT_OF_SCOPE)) {
 4036                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4037                 sctp_m_freem(m);
 4038                 return (EFAULT);
 4039         }
 4040 #if defined(INET) || defined(INET6)
 4041         if (stcb) {
 4042                 vrf_id = stcb->asoc.vrf_id;
 4043         } else {
 4044                 vrf_id = inp->def_vrf_id;
 4045         }
 4046 #endif
 4047         /* fill in the HMAC digest for any AUTH chunk in the packet */
 4048         if ((auth != NULL) && (stcb != NULL)) {
 4049                 sctp_fill_hmac_digest_m(m, auth_offset, auth, stcb, auth_keyid);
 4050         }
 4051         if (net) {
 4052                 tos_value = net->dscp;
 4053         } else if (stcb) {
 4054                 tos_value = stcb->asoc.default_dscp;
 4055         } else {
 4056                 tos_value = inp->sctp_ep.default_dscp;
 4057         }
 4058 
 4059         switch (to->sa_family) {
 4060 #ifdef INET
 4061         case AF_INET:
 4062                 {
 4063                         struct ip *ip = NULL;
 4064                         sctp_route_t iproute;
 4065                         int len;
 4066 
 4067                         len = SCTP_MIN_V4_OVERHEAD;
 4068                         if (port) {
 4069                                 len += sizeof(struct udphdr);
 4070                         }
 4071                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4072                         if (newm == NULL) {
 4073                                 sctp_m_freem(m);
 4074                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4075                                 return (ENOMEM);
 4076                         }
 4077                         SCTP_ALIGN_TO_END(newm, len);
 4078                         SCTP_BUF_LEN(newm) = len;
 4079                         SCTP_BUF_NEXT(newm) = m;
 4080                         m = newm;
 4081                         if (net != NULL) {
 4082                                 m->m_pkthdr.flowid = net->flowid;
 4083                                 M_HASHTYPE_SET(m, net->flowtype);
 4084                         } else {
 4085                                 m->m_pkthdr.flowid = mflowid;
 4086                                 M_HASHTYPE_SET(m, mflowtype);
 4087                         }
 4088                         packet_length = sctp_calculate_len(m);
 4089                         ip = mtod(m, struct ip *);
 4090                         ip->ip_v = IPVERSION;
 4091                         ip->ip_hl = (sizeof(struct ip) >> 2);
 4092                         if (tos_value == 0) {
 4093                                 /*
 4094                                  * This means especially, that it is not set
 4095                                  * at the SCTP layer. So use the value from
 4096                                  * the IP layer.
 4097                                  */
 4098                                 tos_value = inp->ip_inp.inp.inp_ip_tos;
 4099                         }
 4100                         tos_value &= 0xfc;
 4101                         if (ecn_ok) {
 4102                                 tos_value |= sctp_get_ect(stcb);
 4103                         }
 4104                         if ((nofragment_flag) && (port == 0)) {
 4105                                 ip->ip_off = htons(IP_DF);
 4106                         } else {
 4107                                 ip->ip_off = htons(0);
 4108                         }
 4109                         /* FreeBSD has a function for ip_id's */
 4110                         ip->ip_id = ip_newid();
 4111 
 4112                         ip->ip_ttl = inp->ip_inp.inp.inp_ip_ttl;
 4113                         ip->ip_len = htons(packet_length);
 4114                         ip->ip_tos = tos_value;
 4115                         if (port) {
 4116                                 ip->ip_p = IPPROTO_UDP;
 4117                         } else {
 4118                                 ip->ip_p = IPPROTO_SCTP;
 4119                         }
 4120                         ip->ip_sum = 0;
 4121                         if (net == NULL) {
 4122                                 ro = &iproute;
 4123                                 memset(&iproute, 0, sizeof(iproute));
 4124                                 memcpy(&ro->ro_dst, to, to->sa_len);
 4125                         } else {
 4126                                 ro = (sctp_route_t *) & net->ro;
 4127                         }
 4128                         /* Now the address selection part */
 4129                         ip->ip_dst.s_addr = ((struct sockaddr_in *)to)->sin_addr.s_addr;
 4130 
 4131                         /* call the routine to select the src address */
 4132                         if (net && out_of_asoc_ok == 0) {
 4133                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4134                                         sctp_free_ifa(net->ro._s_addr);
 4135                                         net->ro._s_addr = NULL;
 4136                                         net->src_addr_selected = 0;
 4137                                         if (ro->ro_rt) {
 4138                                                 RTFREE(ro->ro_rt);
 4139                                                 ro->ro_rt = NULL;
 4140                                         }
 4141                                 }
 4142                                 if (net->src_addr_selected == 0) {
 4143                                         /* Cache the source address */
 4144                                         net->ro._s_addr = sctp_source_address_selection(inp, stcb,
 4145                                             ro, net, 0,
 4146                                             vrf_id);
 4147                                         net->src_addr_selected = 1;
 4148                                 }
 4149                                 if (net->ro._s_addr == NULL) {
 4150                                         /* No route to host */
 4151                                         net->src_addr_selected = 0;
 4152                                         sctp_handle_no_route(stcb, net, so_locked);
 4153                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4154                                         sctp_m_freem(m);
 4155                                         return (EHOSTUNREACH);
 4156                                 }
 4157                                 ip->ip_src = net->ro._s_addr->address.sin.sin_addr;
 4158                         } else {
 4159                                 if (over_addr == NULL) {
 4160                                         struct sctp_ifa *_lsrc;
 4161 
 4162                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4163                                             net,
 4164                                             out_of_asoc_ok,
 4165                                             vrf_id);
 4166                                         if (_lsrc == NULL) {
 4167                                                 sctp_handle_no_route(stcb, net, so_locked);
 4168                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4169                                                 sctp_m_freem(m);
 4170                                                 return (EHOSTUNREACH);
 4171                                         }
 4172                                         ip->ip_src = _lsrc->address.sin.sin_addr;
 4173                                         sctp_free_ifa(_lsrc);
 4174                                 } else {
 4175                                         ip->ip_src = over_addr->sin.sin_addr;
 4176                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4177                                 }
 4178                         }
 4179                         if (port) {
 4180                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4181                                         sctp_handle_no_route(stcb, net, so_locked);
 4182                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4183                                         sctp_m_freem(m);
 4184                                         return (EHOSTUNREACH);
 4185                                 }
 4186                                 udp = (struct udphdr *)((caddr_t)ip + sizeof(struct ip));
 4187                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4188                                 udp->uh_dport = port;
 4189                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip));
 4190                                 if (V_udp_cksum) {
 4191                                         udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
 4192                                 } else {
 4193                                         udp->uh_sum = 0;
 4194                                 }
 4195                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4196                         } else {
 4197                                 sctphdr = (struct sctphdr *)((caddr_t)ip + sizeof(struct ip));
 4198                         }
 4199 
 4200                         sctphdr->src_port = src_port;
 4201                         sctphdr->dest_port = dest_port;
 4202                         sctphdr->v_tag = v_tag;
 4203                         sctphdr->checksum = 0;
 4204 
 4205                         /*
 4206                          * If source address selection fails and we find no
 4207                          * route then the ip_output should fail as well with
 4208                          * a NO_ROUTE_TO_HOST type error. We probably should
 4209                          * catch that somewhere and abort the association
 4210                          * right away (assuming this is an INIT being sent).
 4211                          */
 4212                         if (ro->ro_rt == NULL) {
 4213                                 /*
 4214                                  * src addr selection failed to find a route
 4215                                  * (or valid source addr), so we can't get
 4216                                  * there from here (yet)!
 4217                                  */
 4218                                 sctp_handle_no_route(stcb, net, so_locked);
 4219                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4220                                 sctp_m_freem(m);
 4221                                 return (EHOSTUNREACH);
 4222                         }
 4223                         if (ro != &iproute) {
 4224                                 memcpy(&iproute, ro, sizeof(*ro));
 4225                         }
 4226                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv4 output routine from low level src addr:%x\n",
 4227                             (uint32_t) (ntohl(ip->ip_src.s_addr)));
 4228                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Destination is %x\n",
 4229                             (uint32_t) (ntohl(ip->ip_dst.s_addr)));
 4230                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "RTP route is %p through\n",
 4231                             (void *)ro->ro_rt);
 4232 
 4233                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4234                                 /* failed to prepend data, give up */
 4235                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4236                                 sctp_m_freem(m);
 4237                                 return (ENOMEM);
 4238                         }
 4239                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4240                         if (port) {
 4241 #if defined(SCTP_WITH_NO_CSUM)
 4242                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4243 #else
 4244                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip) + sizeof(struct udphdr));
 4245                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4246 #endif
 4247                                 if (V_udp_cksum) {
 4248                                         SCTP_ENABLE_UDP_CSUM(o_pak);
 4249                                 }
 4250                         } else {
 4251 #if defined(SCTP_WITH_NO_CSUM)
 4252                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4253 #else
 4254                                 m->m_pkthdr.csum_flags = CSUM_SCTP;
 4255                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4256                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4257 #endif
 4258                         }
 4259 #ifdef SCTP_PACKET_LOGGING
 4260                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4261                                 sctp_packet_log(o_pak);
 4262 #endif
 4263                         /* send it out.  table id is taken from stcb */
 4264 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4265                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4266                                 so = SCTP_INP_SO(inp);
 4267                                 SCTP_SOCKET_UNLOCK(so, 0);
 4268                         }
 4269 #endif
 4270                         SCTP_IP_OUTPUT(ret, o_pak, ro, stcb, vrf_id);
 4271 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4272                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4273                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4274                                 SCTP_TCB_UNLOCK(stcb);
 4275                                 SCTP_SOCKET_LOCK(so, 0);
 4276                                 SCTP_TCB_LOCK(stcb);
 4277                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4278                         }
 4279 #endif
 4280                         SCTP_STAT_INCR(sctps_sendpackets);
 4281                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4282                         if (ret)
 4283                                 SCTP_STAT_INCR(sctps_senderrors);
 4284 
 4285                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "IP output returns %d\n", ret);
 4286                         if (net == NULL) {
 4287                                 /* free tempy routes */
 4288                                 RO_RTFREE(ro);
 4289                         } else {
 4290                                 /*
 4291                                  * PMTU check versus smallest asoc MTU goes
 4292                                  * here
 4293                                  */
 4294                                 if ((ro->ro_rt != NULL) &&
 4295                                     (net->ro._s_addr)) {
 4296                                         uint32_t mtu;
 4297 
 4298                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4299                                         if (net->port) {
 4300                                                 mtu -= sizeof(struct udphdr);
 4301                                         }
 4302                                         if (mtu && (stcb->asoc.smallest_mtu > mtu)) {
 4303                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4304                                                 net->mtu = mtu;
 4305                                         }
 4306                                 } else if (ro->ro_rt == NULL) {
 4307                                         /* route was freed */
 4308                                         if (net->ro._s_addr &&
 4309                                             net->src_addr_selected) {
 4310                                                 sctp_free_ifa(net->ro._s_addr);
 4311                                                 net->ro._s_addr = NULL;
 4312                                         }
 4313                                         net->src_addr_selected = 0;
 4314                                 }
 4315                         }
 4316                         return (ret);
 4317                 }
 4318 #endif
 4319 #ifdef INET6
 4320         case AF_INET6:
 4321                 {
 4322                         uint32_t flowlabel, flowinfo;
 4323                         struct ip6_hdr *ip6h;
 4324                         struct route_in6 ip6route;
 4325                         struct ifnet *ifp;
 4326                         struct sockaddr_in6 *sin6, tmp, *lsa6, lsa6_tmp;
 4327                         int prev_scope = 0;
 4328                         struct sockaddr_in6 lsa6_storage;
 4329                         int error;
 4330                         u_short prev_port = 0;
 4331                         int len;
 4332 
 4333                         if (net) {
 4334                                 flowlabel = net->flowlabel;
 4335                         } else if (stcb) {
 4336                                 flowlabel = stcb->asoc.default_flowlabel;
 4337                         } else {
 4338                                 flowlabel = inp->sctp_ep.default_flowlabel;
 4339                         }
 4340                         if (flowlabel == 0) {
 4341                                 /*
 4342                                  * This means especially, that it is not set
 4343                                  * at the SCTP layer. So use the value from
 4344                                  * the IP layer.
 4345                                  */
 4346                                 flowlabel = ntohl(((struct in6pcb *)inp)->in6p_flowinfo);
 4347                         }
 4348                         flowlabel &= 0x000fffff;
 4349                         len = SCTP_MIN_OVERHEAD;
 4350                         if (port) {
 4351                                 len += sizeof(struct udphdr);
 4352                         }
 4353                         newm = sctp_get_mbuf_for_msg(len, 1, M_NOWAIT, 1, MT_DATA);
 4354                         if (newm == NULL) {
 4355                                 sctp_m_freem(m);
 4356                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4357                                 return (ENOMEM);
 4358                         }
 4359                         SCTP_ALIGN_TO_END(newm, len);
 4360                         SCTP_BUF_LEN(newm) = len;
 4361                         SCTP_BUF_NEXT(newm) = m;
 4362                         m = newm;
 4363                         if (net != NULL) {
 4364                                 m->m_pkthdr.flowid = net->flowid;
 4365                                 M_HASHTYPE_SET(m, net->flowtype);
 4366                         } else {
 4367                                 m->m_pkthdr.flowid = mflowid;
 4368                                 M_HASHTYPE_SET(m, mflowtype);
 4369                         }
 4370                         packet_length = sctp_calculate_len(m);
 4371 
 4372                         ip6h = mtod(m, struct ip6_hdr *);
 4373                         /* protect *sin6 from overwrite */
 4374                         sin6 = (struct sockaddr_in6 *)to;
 4375                         tmp = *sin6;
 4376                         sin6 = &tmp;
 4377 
 4378                         /* KAME hack: embed scopeid */
 4379                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4380                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4381                                 return (EINVAL);
 4382                         }
 4383                         if (net == NULL) {
 4384                                 memset(&ip6route, 0, sizeof(ip6route));
 4385                                 ro = (sctp_route_t *) & ip6route;
 4386                                 memcpy(&ro->ro_dst, sin6, sin6->sin6_len);
 4387                         } else {
 4388                                 ro = (sctp_route_t *) & net->ro;
 4389                         }
 4390                         /*
 4391                          * We assume here that inp_flow is in host byte
 4392                          * order within the TCB!
 4393                          */
 4394                         if (tos_value == 0) {
 4395                                 /*
 4396                                  * This means especially, that it is not set
 4397                                  * at the SCTP layer. So use the value from
 4398                                  * the IP layer.
 4399                                  */
 4400                                 tos_value = (ntohl(((struct in6pcb *)inp)->in6p_flowinfo) >> 20) & 0xff;
 4401                         }
 4402                         tos_value &= 0xfc;
 4403                         if (ecn_ok) {
 4404                                 tos_value |= sctp_get_ect(stcb);
 4405                         }
 4406                         flowinfo = 0x06;
 4407                         flowinfo <<= 8;
 4408                         flowinfo |= tos_value;
 4409                         flowinfo <<= 20;
 4410                         flowinfo |= flowlabel;
 4411                         ip6h->ip6_flow = htonl(flowinfo);
 4412                         if (port) {
 4413                                 ip6h->ip6_nxt = IPPROTO_UDP;
 4414                         } else {
 4415                                 ip6h->ip6_nxt = IPPROTO_SCTP;
 4416                         }
 4417                         ip6h->ip6_plen = (packet_length - sizeof(struct ip6_hdr));
 4418                         ip6h->ip6_dst = sin6->sin6_addr;
 4419 
 4420                         /*
 4421                          * Add SRC address selection here: we can only reuse
 4422                          * to a limited degree the kame src-addr-sel, since
 4423                          * we can try their selection but it may not be
 4424                          * bound.
 4425                          */
 4426                         bzero(&lsa6_tmp, sizeof(lsa6_tmp));
 4427                         lsa6_tmp.sin6_family = AF_INET6;
 4428                         lsa6_tmp.sin6_len = sizeof(lsa6_tmp);
 4429                         lsa6 = &lsa6_tmp;
 4430                         if (net && out_of_asoc_ok == 0) {
 4431                                 if (net->ro._s_addr && (net->ro._s_addr->localifa_flags & (SCTP_BEING_DELETED | SCTP_ADDR_IFA_UNUSEABLE))) {
 4432                                         sctp_free_ifa(net->ro._s_addr);
 4433                                         net->ro._s_addr = NULL;
 4434                                         net->src_addr_selected = 0;
 4435                                         if (ro->ro_rt) {
 4436                                                 RTFREE(ro->ro_rt);
 4437                                                 ro->ro_rt = NULL;
 4438                                         }
 4439                                 }
 4440                                 if (net->src_addr_selected == 0) {
 4441                                         sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4442                                         /* KAME hack: embed scopeid */
 4443                                         if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4444                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4445                                                 return (EINVAL);
 4446                                         }
 4447                                         /* Cache the source address */
 4448                                         net->ro._s_addr = sctp_source_address_selection(inp,
 4449                                             stcb,
 4450                                             ro,
 4451                                             net,
 4452                                             0,
 4453                                             vrf_id);
 4454                                         (void)sa6_recoverscope(sin6);
 4455                                         net->src_addr_selected = 1;
 4456                                 }
 4457                                 if (net->ro._s_addr == NULL) {
 4458                                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "V6:No route to host\n");
 4459                                         net->src_addr_selected = 0;
 4460                                         sctp_handle_no_route(stcb, net, so_locked);
 4461                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4462                                         sctp_m_freem(m);
 4463                                         return (EHOSTUNREACH);
 4464                                 }
 4465                                 lsa6->sin6_addr = net->ro._s_addr->address.sin6.sin6_addr;
 4466                         } else {
 4467                                 sin6 = (struct sockaddr_in6 *)&ro->ro_dst;
 4468                                 /* KAME hack: embed scopeid */
 4469                                 if (sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone)) != 0) {
 4470                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 4471                                         return (EINVAL);
 4472                                 }
 4473                                 if (over_addr == NULL) {
 4474                                         struct sctp_ifa *_lsrc;
 4475 
 4476                                         _lsrc = sctp_source_address_selection(inp, stcb, ro,
 4477                                             net,
 4478                                             out_of_asoc_ok,
 4479                                             vrf_id);
 4480                                         if (_lsrc == NULL) {
 4481                                                 sctp_handle_no_route(stcb, net, so_locked);
 4482                                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4483                                                 sctp_m_freem(m);
 4484                                                 return (EHOSTUNREACH);
 4485                                         }
 4486                                         lsa6->sin6_addr = _lsrc->address.sin6.sin6_addr;
 4487                                         sctp_free_ifa(_lsrc);
 4488                                 } else {
 4489                                         lsa6->sin6_addr = over_addr->sin6.sin6_addr;
 4490                                         SCTP_RTALLOC(ro, vrf_id, inp->fibnum);
 4491                                 }
 4492                                 (void)sa6_recoverscope(sin6);
 4493                         }
 4494                         lsa6->sin6_port = inp->sctp_lport;
 4495 
 4496                         if (ro->ro_rt == NULL) {
 4497                                 /*
 4498                                  * src addr selection failed to find a route
 4499                                  * (or valid source addr), so we can't get
 4500                                  * there from here!
 4501                                  */
 4502                                 sctp_handle_no_route(stcb, net, so_locked);
 4503                                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4504                                 sctp_m_freem(m);
 4505                                 return (EHOSTUNREACH);
 4506                         }
 4507                         /*
 4508                          * XXX: sa6 may not have a valid sin6_scope_id in
 4509                          * the non-SCOPEDROUTING case.
 4510                          */
 4511                         bzero(&lsa6_storage, sizeof(lsa6_storage));
 4512                         lsa6_storage.sin6_family = AF_INET6;
 4513                         lsa6_storage.sin6_len = sizeof(lsa6_storage);
 4514                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4515                         if ((error = sa6_recoverscope(&lsa6_storage)) != 0) {
 4516                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "recover scope fails error %d\n", error);
 4517                                 sctp_m_freem(m);
 4518                                 return (error);
 4519                         }
 4520                         /* XXX */
 4521                         lsa6_storage.sin6_addr = lsa6->sin6_addr;
 4522                         lsa6_storage.sin6_port = inp->sctp_lport;
 4523                         lsa6 = &lsa6_storage;
 4524                         ip6h->ip6_src = lsa6->sin6_addr;
 4525 
 4526                         if (port) {
 4527                                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
 4528                                         sctp_handle_no_route(stcb, net, so_locked);
 4529                                         SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EHOSTUNREACH);
 4530                                         sctp_m_freem(m);
 4531                                         return (EHOSTUNREACH);
 4532                                 }
 4533                                 udp = (struct udphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4534                                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
 4535                                 udp->uh_dport = port;
 4536                                 udp->uh_ulen = htons(packet_length - sizeof(struct ip6_hdr));
 4537                                 udp->uh_sum = 0;
 4538                                 sctphdr = (struct sctphdr *)((caddr_t)udp + sizeof(struct udphdr));
 4539                         } else {
 4540                                 sctphdr = (struct sctphdr *)((caddr_t)ip6h + sizeof(struct ip6_hdr));
 4541                         }
 4542 
 4543                         sctphdr->src_port = src_port;
 4544                         sctphdr->dest_port = dest_port;
 4545                         sctphdr->v_tag = v_tag;
 4546                         sctphdr->checksum = 0;
 4547 
 4548                         /*
 4549                          * We set the hop limit now since there is a good
 4550                          * chance that our ro pointer is now filled
 4551                          */
 4552                         ip6h->ip6_hlim = SCTP_GET_HLIM(inp, ro);
 4553                         ifp = SCTP_GET_IFN_VOID_FROM_ROUTE(ro);
 4554 
 4555 #ifdef SCTP_DEBUG
 4556                         /* Copy to be sure something bad is not happening */
 4557                         sin6->sin6_addr = ip6h->ip6_dst;
 4558                         lsa6->sin6_addr = ip6h->ip6_src;
 4559 #endif
 4560 
 4561                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Calling ipv6 output routine from low level\n");
 4562                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "src: ");
 4563                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)lsa6);
 4564                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "dst: ");
 4565                         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT3, (struct sockaddr *)sin6);
 4566                         if (net) {
 4567                                 sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
 4568                                 /*
 4569                                  * preserve the port and scope for link
 4570                                  * local send
 4571                                  */
 4572                                 prev_scope = sin6->sin6_scope_id;
 4573                                 prev_port = sin6->sin6_port;
 4574                         }
 4575                         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
 4576                                 /* failed to prepend data, give up */
 4577                                 sctp_m_freem(m);
 4578                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 4579                                 return (ENOMEM);
 4580                         }
 4581                         SCTP_ATTACH_CHAIN(o_pak, m, packet_length);
 4582                         if (port) {
 4583 #if defined(SCTP_WITH_NO_CSUM)
 4584                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4585 #else
 4586                                 sctphdr->checksum = sctp_calculate_cksum(m, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
 4587                                 SCTP_STAT_INCR(sctps_sendswcrc);
 4588 #endif
 4589                                 if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), packet_length - sizeof(struct ip6_hdr))) == 0) {
 4590                                         udp->uh_sum = 0xffff;
 4591                                 }
 4592                         } else {
 4593 #if defined(SCTP_WITH_NO_CSUM)
 4594                                 SCTP_STAT_INCR(sctps_sendnocrc);
 4595 #else
 4596                                 m->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
 4597                                 m->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
 4598                                 SCTP_STAT_INCR(sctps_sendhwcrc);
 4599 #endif
 4600                         }
 4601                         /* send it out. table id is taken from stcb */
 4602 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4603                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4604                                 so = SCTP_INP_SO(inp);
 4605                                 SCTP_SOCKET_UNLOCK(so, 0);
 4606                         }
 4607 #endif
 4608 #ifdef SCTP_PACKET_LOGGING
 4609                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING)
 4610                                 sctp_packet_log(o_pak);
 4611 #endif
 4612                         SCTP_IP6_OUTPUT(ret, o_pak, (struct route_in6 *)ro, &ifp, stcb, vrf_id);
 4613 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
 4614                         if ((SCTP_BASE_SYSCTL(sctp_output_unlocked)) && (so_locked)) {
 4615                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 4616                                 SCTP_TCB_UNLOCK(stcb);
 4617                                 SCTP_SOCKET_LOCK(so, 0);
 4618                                 SCTP_TCB_LOCK(stcb);
 4619                                 atomic_subtract_int(&stcb->asoc.refcnt, 1);
 4620                         }
 4621 #endif
 4622                         if (net) {
 4623                                 /* for link local this must be done */
 4624                                 sin6->sin6_scope_id = prev_scope;
 4625                                 sin6->sin6_port = prev_port;
 4626                         }
 4627                         SCTPDBG(SCTP_DEBUG_OUTPUT3, "return from send is %d\n", ret);
 4628                         SCTP_STAT_INCR(sctps_sendpackets);
 4629                         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
 4630                         if (ret) {
 4631                                 SCTP_STAT_INCR(sctps_senderrors);
 4632                         }
 4633                         if (net == NULL) {
 4634                                 /* Now if we had a temp route free it */
 4635                                 RO_RTFREE(ro);
 4636                         } else {
 4637                                 /*
 4638                                  * PMTU check versus smallest asoc MTU goes
 4639                                  * here
 4640                                  */
 4641                                 if (ro->ro_rt == NULL) {
 4642                                         /* Route was freed */
 4643                                         if (net->ro._s_addr &&
 4644                                             net->src_addr_selected) {
 4645                                                 sctp_free_ifa(net->ro._s_addr);
 4646                                                 net->ro._s_addr = NULL;
 4647                                         }
 4648                                         net->src_addr_selected = 0;
 4649                                 }
 4650                                 if ((ro->ro_rt != NULL) &&
 4651                                     (net->ro._s_addr)) {
 4652                                         uint32_t mtu;
 4653 
 4654                                         mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._l_addr.sa, ro->ro_rt);
 4655                                         if (mtu &&
 4656                                             (stcb->asoc.smallest_mtu > mtu)) {
 4657                                                 sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
 4658                                                 net->mtu = mtu;
 4659                                                 if (net->port) {
 4660                                                         net->mtu -= sizeof(struct udphdr);
 4661                                                 }
 4662                                         }
 4663                                 } else if (ifp) {
 4664                                         if (ND_IFINFO(ifp)->linkmtu &&
 4665                                             (stcb->asoc.smallest_mtu > ND_IFINFO(ifp)->linkmtu)) {
 4666                                                 sctp_mtu_size_reset(inp,
 4667                                                     &stcb->asoc,
 4668                                                     ND_IFINFO(ifp)->linkmtu);
 4669                                         }
 4670                                 }
 4671                         }
 4672                         return (ret);
 4673                 }
 4674 #endif
 4675         default:
 4676                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
 4677                     ((struct sockaddr *)to)->sa_family);
 4678                 sctp_m_freem(m);
 4679                 SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 4680                 return (EFAULT);
 4681         }
 4682 }
 4683 
 4684 
 4685 void
 4686 sctp_send_initiate(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int so_locked
 4687 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 4688     SCTP_UNUSED
 4689 #endif
 4690 )
 4691 {
 4692         struct mbuf *m, *m_last;
 4693         struct sctp_nets *net;
 4694         struct sctp_init_chunk *init;
 4695         struct sctp_supported_addr_param *sup_addr;
 4696         struct sctp_adaptation_layer_indication *ali;
 4697         struct sctp_supported_chunk_types_param *pr_supported;
 4698         struct sctp_paramhdr *ph;
 4699         int cnt_inits_to = 0;
 4700         int ret;
 4701         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 4702 
 4703         /* INIT's always go to the primary (and usually ONLY address) */
 4704         net = stcb->asoc.primary_destination;
 4705         if (net == NULL) {
 4706                 net = TAILQ_FIRST(&stcb->asoc.nets);
 4707                 if (net == NULL) {
 4708                         /* TSNH */
 4709                         return;
 4710                 }
 4711                 /* we confirm any address we send an INIT to */
 4712                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4713                 (void)sctp_set_primary_addr(stcb, NULL, net);
 4714         } else {
 4715                 /* we confirm any address we send an INIT to */
 4716                 net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
 4717         }
 4718         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT\n");
 4719 #ifdef INET6
 4720         if (net->ro._l_addr.sa.sa_family == AF_INET6) {
 4721                 /*
 4722                  * special hook, if we are sending to link local it will not
 4723                  * show up in our private address count.
 4724                  */
 4725                 if (IN6_IS_ADDR_LINKLOCAL(&net->ro._l_addr.sin6.sin6_addr))
 4726                         cnt_inits_to = 1;
 4727         }
 4728 #endif
 4729         if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 4730                 /* This case should not happen */
 4731                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - failed timer?\n");
 4732                 return;
 4733         }
 4734         /* start the INIT timer */
 4735         sctp_timer_start(SCTP_TIMER_TYPE_INIT, inp, stcb, net);
 4736 
 4737         m = sctp_get_mbuf_for_msg(MCLBYTES, 1, M_NOWAIT, 1, MT_DATA);
 4738         if (m == NULL) {
 4739                 /* No memory, INIT timer will re-attempt. */
 4740                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - mbuf?\n");
 4741                 return;
 4742         }
 4743         chunk_len = (uint16_t) sizeof(struct sctp_init_chunk);
 4744         padding_len = 0;
 4745         /* Now lets put the chunk header in place */
 4746         init = mtod(m, struct sctp_init_chunk *);
 4747         /* now the chunk header */
 4748         init->ch.chunk_type = SCTP_INITIATION;
 4749         init->ch.chunk_flags = 0;
 4750         /* fill in later from mbuf we build */
 4751         init->ch.chunk_length = 0;
 4752         /* place in my tag */
 4753         init->init.initiate_tag = htonl(stcb->asoc.my_vtag);
 4754         /* set up some of the credits. */
 4755         init->init.a_rwnd = htonl(max(inp->sctp_socket ? SCTP_SB_LIMIT_RCV(inp->sctp_socket) : 0,
 4756             SCTP_MINIMAL_RWND));
 4757         init->init.num_outbound_streams = htons(stcb->asoc.pre_open_streams);
 4758         init->init.num_inbound_streams = htons(stcb->asoc.max_inbound_streams);
 4759         init->init.initial_tsn = htonl(stcb->asoc.init_seq_number);
 4760 
 4761         /* Adaptation layer indication parameter */
 4762         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 4763                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
 4764                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 4765                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 4766                 ali->ph.param_length = htons(parameter_len);
 4767                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 4768                 chunk_len += parameter_len;
 4769         }
 4770         /* ECN parameter */
 4771         if (stcb->asoc.ecn_supported == 1) {
 4772                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 4773                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4774                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 4775                 ph->param_length = htons(parameter_len);
 4776                 chunk_len += parameter_len;
 4777         }
 4778         /* PR-SCTP supported parameter */
 4779         if (stcb->asoc.prsctp_supported == 1) {
 4780                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 4781                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4782                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 4783                 ph->param_length = htons(parameter_len);
 4784                 chunk_len += parameter_len;
 4785         }
 4786         /* Add NAT friendly parameter. */
 4787         if (SCTP_BASE_SYSCTL(sctp_inits_include_nat_friendly)) {
 4788                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 4789                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 4790                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 4791                 ph->param_length = htons(parameter_len);
 4792                 chunk_len += parameter_len;
 4793         }
 4794         /* And now tell the peer which extensions we support */
 4795         num_ext = 0;
 4796         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 4797         if (stcb->asoc.prsctp_supported == 1) {
 4798                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 4799         }
 4800         if (stcb->asoc.auth_supported == 1) {
 4801                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 4802         }
 4803         if (stcb->asoc.asconf_supported == 1) {
 4804                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 4805                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 4806         }
 4807         if (stcb->asoc.reconfig_supported == 1) {
 4808                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 4809         }
 4810         if (stcb->asoc.nrsack_supported == 1) {
 4811                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 4812         }
 4813         if (stcb->asoc.pktdrop_supported == 1) {
 4814                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 4815         }
 4816         if (num_ext > 0) {
 4817                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 4818                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 4819                 pr_supported->ph.param_length = htons(parameter_len);
 4820                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4821                 chunk_len += parameter_len;
 4822         }
 4823         /* add authentication parameters */
 4824         if (stcb->asoc.auth_supported) {
 4825                 /* attach RANDOM parameter, if available */
 4826                 if (stcb->asoc.authinfo.random != NULL) {
 4827                         struct sctp_auth_random *randp;
 4828 
 4829                         if (padding_len > 0) {
 4830                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4831                                 chunk_len += padding_len;
 4832                                 padding_len = 0;
 4833                         }
 4834                         randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 4835                         parameter_len = (uint16_t) sizeof(struct sctp_auth_random) + stcb->asoc.authinfo.random_len;
 4836                         /* random key already contains the header */
 4837                         memcpy(randp, stcb->asoc.authinfo.random->key, parameter_len);
 4838                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4839                         chunk_len += parameter_len;
 4840                 }
 4841                 /* add HMAC_ALGO parameter */
 4842                 if (stcb->asoc.local_hmacs != NULL) {
 4843                         struct sctp_auth_hmac_algo *hmacs;
 4844 
 4845                         if (padding_len > 0) {
 4846                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4847                                 chunk_len += padding_len;
 4848                                 padding_len = 0;
 4849                         }
 4850                         hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 4851                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_hmac_algo) +
 4852                             stcb->asoc.local_hmacs->num_algo * sizeof(uint16_t));
 4853                         hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 4854                         hmacs->ph.param_length = htons(parameter_len);
 4855                         sctp_serialize_hmaclist(stcb->asoc.local_hmacs, (uint8_t *) hmacs->hmac_ids);
 4856                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4857                         chunk_len += parameter_len;
 4858                 }
 4859                 /* add CHUNKS parameter */
 4860                 if (stcb->asoc.local_auth_chunks != NULL) {
 4861                         struct sctp_auth_chunk_list *chunks;
 4862 
 4863                         if (padding_len > 0) {
 4864                                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4865                                 chunk_len += padding_len;
 4866                                 padding_len = 0;
 4867                         }
 4868                         chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 4869                         parameter_len = (uint16_t) (sizeof(struct sctp_auth_chunk_list) +
 4870                             sctp_auth_get_chklist_size(stcb->asoc.local_auth_chunks));
 4871                         chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 4872                         chunks->ph.param_length = htons(parameter_len);
 4873                         sctp_serialize_auth_chunks(stcb->asoc.local_auth_chunks, chunks->chunk_types);
 4874                         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 4875                         chunk_len += parameter_len;
 4876                 }
 4877         }
 4878         /* now any cookie time extensions */
 4879         if (stcb->asoc.cookie_preserve_req) {
 4880                 struct sctp_cookie_perserve_param *cookie_preserve;
 4881 
 4882                 if (padding_len > 0) {
 4883                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4884                         chunk_len += padding_len;
 4885                         padding_len = 0;
 4886                 }
 4887                 parameter_len = (uint16_t) sizeof(struct sctp_cookie_perserve_param);
 4888                 cookie_preserve = (struct sctp_cookie_perserve_param *)(mtod(m, caddr_t)+chunk_len);
 4889                 cookie_preserve->ph.param_type = htons(SCTP_COOKIE_PRESERVE);
 4890                 cookie_preserve->ph.param_length = htons(parameter_len);
 4891                 cookie_preserve->time = htonl(stcb->asoc.cookie_preserve_req);
 4892                 stcb->asoc.cookie_preserve_req = 0;
 4893                 chunk_len += parameter_len;
 4894         }
 4895         if (stcb->asoc.scope.ipv4_addr_legal || stcb->asoc.scope.ipv6_addr_legal) {
 4896                 uint8_t i;
 4897 
 4898                 if (padding_len > 0) {
 4899                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 4900                         chunk_len += padding_len;
 4901                         padding_len = 0;
 4902                 }
 4903                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 4904                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4905                         parameter_len += (uint16_t) sizeof(uint16_t);
 4906                 }
 4907                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4908                         parameter_len += (uint16_t) sizeof(uint16_t);
 4909                 }
 4910                 sup_addr = (struct sctp_supported_addr_param *)(mtod(m, caddr_t)+chunk_len);
 4911                 sup_addr->ph.param_type = htons(SCTP_SUPPORTED_ADDRTYPE);
 4912                 sup_addr->ph.param_length = htons(parameter_len);
 4913                 i = 0;
 4914                 if (stcb->asoc.scope.ipv4_addr_legal) {
 4915                         sup_addr->addr_type[i++] = htons(SCTP_IPV4_ADDRESS);
 4916                 }
 4917                 if (stcb->asoc.scope.ipv6_addr_legal) {
 4918                         sup_addr->addr_type[i++] = htons(SCTP_IPV6_ADDRESS);
 4919                 }
 4920                 padding_len = 4 - 2 * i;
 4921                 chunk_len += parameter_len;
 4922         }
 4923         SCTP_BUF_LEN(m) = chunk_len;
 4924         /* now the addresses */
 4925         /*
 4926          * To optimize this we could put the scoping stuff into a structure
 4927          * and remove the individual uint8's from the assoc structure. Then
 4928          * we could just sifa in the address within the stcb. But for now
 4929          * this is a quick hack to get the address stuff teased apart.
 4930          */
 4931         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &stcb->asoc.scope,
 4932             m, cnt_inits_to,
 4933             &padding_len, &chunk_len);
 4934 
 4935         init->ch.chunk_length = htons(chunk_len);
 4936         if (padding_len > 0) {
 4937                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 4938                         sctp_m_freem(m);
 4939                         return;
 4940                 }
 4941         }
 4942         SCTPDBG(SCTP_DEBUG_OUTPUT4, "Sending INIT - calls lowlevel_output\n");
 4943         ret = sctp_lowlevel_chunk_output(inp, stcb, net,
 4944             (struct sockaddr *)&net->ro._l_addr,
 4945             m, 0, NULL, 0, 0, 0, 0,
 4946             inp->sctp_lport, stcb->rport, htonl(0),
 4947             net->port, NULL,
 4948             0, 0,
 4949             so_locked);
 4950         SCTPDBG(SCTP_DEBUG_OUTPUT4, "lowlevel_output - %d\n", ret);
 4951         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 4952         (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time);
 4953 }
 4954 
 4955 struct mbuf *
 4956 sctp_arethere_unrecognized_parameters(struct mbuf *in_initpkt,
 4957     int param_offset, int *abort_processing, struct sctp_chunkhdr *cp, int *nat_friendly)
 4958 {
 4959         /*
 4960          * Given a mbuf containing an INIT or INIT-ACK with the param_offset
 4961          * being equal to the beginning of the params i.e. (iphlen +
 4962          * sizeof(struct sctp_init_msg) parse through the parameters to the
 4963          * end of the mbuf verifying that all parameters are known.
 4964          * 
 4965          * For unknown parameters build and return a mbuf with
 4966          * UNRECOGNIZED_PARAMETER errors. If the flags indicate to stop
 4967          * processing this chunk stop, and set *abort_processing to 1.
 4968          * 
 4969          * By having param_offset be pre-set to where parameters begin it is
 4970          * hoped that this routine may be reused in the future by new
 4971          * features.
 4972          */
 4973         struct sctp_paramhdr *phdr, params;
 4974 
 4975         struct mbuf *mat, *op_err;
 4976         char tempbuf[SCTP_PARAM_BUFFER_SIZE];
 4977         int at, limit, pad_needed;
 4978         uint16_t ptype, plen, padded_size;
 4979         int err_at;
 4980 
 4981         *abort_processing = 0;
 4982         mat = in_initpkt;
 4983         err_at = 0;
 4984         limit = ntohs(cp->chunk_length) - sizeof(struct sctp_init_chunk);
 4985         at = param_offset;
 4986         op_err = NULL;
 4987         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Check for unrecognized param's\n");
 4988         phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 4989         while ((phdr != NULL) && ((size_t)limit >= sizeof(struct sctp_paramhdr))) {
 4990                 ptype = ntohs(phdr->param_type);
 4991                 plen = ntohs(phdr->param_length);
 4992                 if ((plen > limit) || (plen < sizeof(struct sctp_paramhdr))) {
 4993                         /* wacked parameter */
 4994                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error %d\n", plen);
 4995                         goto invalid_size;
 4996                 }
 4997                 limit -= SCTP_SIZE32(plen);
 4998                 /*-
 4999                  * All parameters for all chunks that we know/understand are
 5000                  * listed here. We process them other places and make
 5001                  * appropriate stop actions per the upper bits. However this
 5002                  * is the generic routine processor's can call to get back
 5003                  * an operr.. to either incorporate (init-ack) or send.
 5004                  */
 5005                 padded_size = SCTP_SIZE32(plen);
 5006                 switch (ptype) {
 5007                         /* Param's with variable size */
 5008                 case SCTP_HEARTBEAT_INFO:
 5009                 case SCTP_STATE_COOKIE:
 5010                 case SCTP_UNRECOG_PARAM:
 5011                 case SCTP_ERROR_CAUSE_IND:
 5012                         /* ok skip fwd */
 5013                         at += padded_size;
 5014                         break;
 5015                         /* Param's with variable size within a range */
 5016                 case SCTP_CHUNK_LIST:
 5017                 case SCTP_SUPPORTED_CHUNK_EXT:
 5018                         if (padded_size > (sizeof(struct sctp_supported_chunk_types_param) + (sizeof(uint8_t) * SCTP_MAX_SUPPORTED_EXT))) {
 5019                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error chklist %d\n", plen);
 5020                                 goto invalid_size;
 5021                         }
 5022                         at += padded_size;
 5023                         break;
 5024                 case SCTP_SUPPORTED_ADDRTYPE:
 5025                         if (padded_size > SCTP_MAX_ADDR_PARAMS_SIZE) {
 5026                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error supaddrtype %d\n", plen);
 5027                                 goto invalid_size;
 5028                         }
 5029                         at += padded_size;
 5030                         break;
 5031                 case SCTP_RANDOM:
 5032                         if (padded_size > (sizeof(struct sctp_auth_random) + SCTP_RANDOM_MAX_SIZE)) {
 5033                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error random %d\n", plen);
 5034                                 goto invalid_size;
 5035                         }
 5036                         at += padded_size;
 5037                         break;
 5038                 case SCTP_SET_PRIM_ADDR:
 5039                 case SCTP_DEL_IP_ADDRESS:
 5040                 case SCTP_ADD_IP_ADDRESS:
 5041                         if ((padded_size != sizeof(struct sctp_asconf_addrv4_param)) &&
 5042                             (padded_size != sizeof(struct sctp_asconf_addr_param))) {
 5043                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error setprim %d\n", plen);
 5044                                 goto invalid_size;
 5045                         }
 5046                         at += padded_size;
 5047                         break;
 5048                         /* Param's with a fixed size */
 5049                 case SCTP_IPV4_ADDRESS:
 5050                         if (padded_size != sizeof(struct sctp_ipv4addr_param)) {
 5051                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv4 addr %d\n", plen);
 5052                                 goto invalid_size;
 5053                         }
 5054                         at += padded_size;
 5055                         break;
 5056                 case SCTP_IPV6_ADDRESS:
 5057                         if (padded_size != sizeof(struct sctp_ipv6addr_param)) {
 5058                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ipv6 addr %d\n", plen);
 5059                                 goto invalid_size;
 5060                         }
 5061                         at += padded_size;
 5062                         break;
 5063                 case SCTP_COOKIE_PRESERVE:
 5064                         if (padded_size != sizeof(struct sctp_cookie_perserve_param)) {
 5065                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error cookie-preserve %d\n", plen);
 5066                                 goto invalid_size;
 5067                         }
 5068                         at += padded_size;
 5069                         break;
 5070                 case SCTP_HAS_NAT_SUPPORT:
 5071                         *nat_friendly = 1;
 5072                         /* fall through */
 5073                 case SCTP_PRSCTP_SUPPORTED:
 5074                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5075                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error prsctp/nat support %d\n", plen);
 5076                                 goto invalid_size;
 5077                         }
 5078                         at += padded_size;
 5079                         break;
 5080                 case SCTP_ECN_CAPABLE:
 5081                         if (padded_size != sizeof(struct sctp_paramhdr)) {
 5082                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error ecn %d\n", plen);
 5083                                 goto invalid_size;
 5084                         }
 5085                         at += padded_size;
 5086                         break;
 5087                 case SCTP_ULP_ADAPTATION:
 5088                         if (padded_size != sizeof(struct sctp_adaptation_layer_indication)) {
 5089                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error adapatation %d\n", plen);
 5090                                 goto invalid_size;
 5091                         }
 5092                         at += padded_size;
 5093                         break;
 5094                 case SCTP_SUCCESS_REPORT:
 5095                         if (padded_size != sizeof(struct sctp_asconf_paramhdr)) {
 5096                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Invalid size - error success %d\n", plen);
 5097                                 goto invalid_size;
 5098                         }
 5099                         at += padded_size;
 5100                         break;
 5101                 case SCTP_HOSTNAME_ADDRESS:
 5102                         {
 5103                                 /* We can NOT handle HOST NAME addresses!! */
 5104                                 int l_len;
 5105 
 5106                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Can't handle hostname addresses.. abort processing\n");
 5107                                 *abort_processing = 1;
 5108                                 if (op_err == NULL) {
 5109                                         /* Ok need to try to get a mbuf */
 5110 #ifdef INET6
 5111                                         l_len = SCTP_MIN_OVERHEAD;
 5112 #else
 5113                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5114 #endif
 5115                                         l_len += sizeof(struct sctp_chunkhdr);
 5116                                         l_len += plen;
 5117                                         l_len += sizeof(struct sctp_paramhdr);
 5118                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5119                                         if (op_err) {
 5120                                                 SCTP_BUF_LEN(op_err) = 0;
 5121                                                 /*
 5122                                                  * pre-reserve space for ip
 5123                                                  * and sctp header  and
 5124                                                  * chunk hdr
 5125                                                  */
 5126 #ifdef INET6
 5127                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5128 #else
 5129                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5130 #endif
 5131                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5132                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5133                                         }
 5134                                 }
 5135                                 if (op_err) {
 5136                                         /* If we have space */
 5137                                         struct sctp_paramhdr s;
 5138 
 5139                                         if (err_at % 4) {
 5140                                                 uint32_t cpthis = 0;
 5141 
 5142                                                 pad_needed = 4 - (err_at % 4);
 5143                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5144                                                 err_at += pad_needed;
 5145                                         }
 5146                                         s.param_type = htons(SCTP_CAUSE_UNRESOLVABLE_ADDR);
 5147                                         s.param_length = htons(sizeof(s) + plen);
 5148                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5149                                         err_at += sizeof(s);
 5150                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 5151                                         if (phdr == NULL) {
 5152                                                 sctp_m_freem(op_err);
 5153                                                 /*
 5154                                                  * we are out of memory but
 5155                                                  * we still need to have a
 5156                                                  * look at what to do (the
 5157                                                  * system is in trouble
 5158                                                  * though).
 5159                                                  */
 5160                                                 return (NULL);
 5161                                         }
 5162                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 5163                                 }
 5164                                 return (op_err);
 5165                                 break;
 5166                         }
 5167                 default:
 5168                         /*
 5169                          * we do not recognize the parameter figure out what
 5170                          * we do.
 5171                          */
 5172                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Hit default param %x\n", ptype);
 5173                         if ((ptype & 0x4000) == 0x4000) {
 5174                                 /* Report bit is set?? */
 5175                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "report op err\n");
 5176                                 if (op_err == NULL) {
 5177                                         int l_len;
 5178 
 5179                                         /* Ok need to try to get an mbuf */
 5180 #ifdef INET6
 5181                                         l_len = SCTP_MIN_OVERHEAD;
 5182 #else
 5183                                         l_len = SCTP_MIN_V4_OVERHEAD;
 5184 #endif
 5185                                         l_len += sizeof(struct sctp_chunkhdr);
 5186                                         l_len += plen;
 5187                                         l_len += sizeof(struct sctp_paramhdr);
 5188                                         op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5189                                         if (op_err) {
 5190                                                 SCTP_BUF_LEN(op_err) = 0;
 5191 #ifdef INET6
 5192                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5193 #else
 5194                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5195 #endif
 5196                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5197                                                 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5198                                         }
 5199                                 }
 5200                                 if (op_err) {
 5201                                         /* If we have space */
 5202                                         struct sctp_paramhdr s;
 5203 
 5204                                         if (err_at % 4) {
 5205                                                 uint32_t cpthis = 0;
 5206 
 5207                                                 pad_needed = 4 - (err_at % 4);
 5208                                                 m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5209                                                 err_at += pad_needed;
 5210                                         }
 5211                                         s.param_type = htons(SCTP_UNRECOG_PARAM);
 5212                                         s.param_length = htons(sizeof(s) + plen);
 5213                                         m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5214                                         err_at += sizeof(s);
 5215                                         if (plen > sizeof(tempbuf)) {
 5216                                                 plen = sizeof(tempbuf);
 5217                                         }
 5218                                         phdr = sctp_get_next_param(mat, at, (struct sctp_paramhdr *)tempbuf, min(sizeof(tempbuf), plen));
 5219                                         if (phdr == NULL) {
 5220                                                 sctp_m_freem(op_err);
 5221                                                 /*
 5222                                                  * we are out of memory but
 5223                                                  * we still need to have a
 5224                                                  * look at what to do (the
 5225                                                  * system is in trouble
 5226                                                  * though).
 5227                                                  */
 5228                                                 op_err = NULL;
 5229                                                 goto more_processing;
 5230                                         }
 5231                                         m_copyback(op_err, err_at, plen, (caddr_t)phdr);
 5232                                         err_at += plen;
 5233                                 }
 5234                         }
 5235         more_processing:
 5236                         if ((ptype & 0x8000) == 0x0000) {
 5237                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "stop proc\n");
 5238                                 return (op_err);
 5239                         } else {
 5240                                 /* skip this chunk and continue processing */
 5241                                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "move on\n");
 5242                                 at += SCTP_SIZE32(plen);
 5243                         }
 5244                         break;
 5245 
 5246                 }
 5247                 phdr = sctp_get_next_param(mat, at, &params, sizeof(params));
 5248         }
 5249         return (op_err);
 5250 invalid_size:
 5251         SCTPDBG(SCTP_DEBUG_OUTPUT1, "abort flag set\n");
 5252         *abort_processing = 1;
 5253         if ((op_err == NULL) && phdr) {
 5254                 int l_len;
 5255 
 5256 #ifdef INET6
 5257                 l_len = SCTP_MIN_OVERHEAD;
 5258 #else
 5259                 l_len = SCTP_MIN_V4_OVERHEAD;
 5260 #endif
 5261                 l_len += sizeof(struct sctp_chunkhdr);
 5262                 l_len += (2 * sizeof(struct sctp_paramhdr));
 5263                 op_err = sctp_get_mbuf_for_msg(l_len, 0, M_NOWAIT, 1, MT_DATA);
 5264                 if (op_err) {
 5265                         SCTP_BUF_LEN(op_err) = 0;
 5266 #ifdef INET6
 5267                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr));
 5268 #else
 5269                         SCTP_BUF_RESV_UF(op_err, sizeof(struct ip));
 5270 #endif
 5271                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr));
 5272                         SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr));
 5273                 }
 5274         }
 5275         if ((op_err) && phdr) {
 5276                 struct sctp_paramhdr s;
 5277 
 5278                 if (err_at % 4) {
 5279                         uint32_t cpthis = 0;
 5280 
 5281                         pad_needed = 4 - (err_at % 4);
 5282                         m_copyback(op_err, err_at, pad_needed, (caddr_t)&cpthis);
 5283                         err_at += pad_needed;
 5284                 }
 5285                 s.param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
 5286                 s.param_length = htons(sizeof(s) + sizeof(struct sctp_paramhdr));
 5287                 m_copyback(op_err, err_at, sizeof(s), (caddr_t)&s);
 5288                 err_at += sizeof(s);
 5289                 /* Only copy back the p-hdr that caused the issue */
 5290                 m_copyback(op_err, err_at, sizeof(struct sctp_paramhdr), (caddr_t)phdr);
 5291         }
 5292         return (op_err);
 5293 }
 5294 
 5295 static int
 5296 sctp_are_there_new_addresses(struct sctp_association *asoc,
 5297     struct mbuf *in_initpkt, int offset, struct sockaddr *src)
 5298 {
 5299         /*
 5300          * Given a INIT packet, look through the packet to verify that there
 5301          * are NO new addresses. As we go through the parameters add reports
 5302          * of any un-understood parameters that require an error.  Also we
 5303          * must return (1) to drop the packet if we see a un-understood
 5304          * parameter that tells us to drop the chunk.
 5305          */
 5306         struct sockaddr *sa_touse;
 5307         struct sockaddr *sa;
 5308         struct sctp_paramhdr *phdr, params;
 5309         uint16_t ptype, plen;
 5310         uint8_t fnd;
 5311         struct sctp_nets *net;
 5312         int check_src;
 5313 
 5314 #ifdef INET
 5315         struct sockaddr_in sin4, *sa4;
 5316 
 5317 #endif
 5318 #ifdef INET6
 5319         struct sockaddr_in6 sin6, *sa6;
 5320 
 5321 #endif
 5322 
 5323 #ifdef INET
 5324         memset(&sin4, 0, sizeof(sin4));
 5325         sin4.sin_family = AF_INET;
 5326         sin4.sin_len = sizeof(sin4);
 5327 #endif
 5328 #ifdef INET6
 5329         memset(&sin6, 0, sizeof(sin6));
 5330         sin6.sin6_family = AF_INET6;
 5331         sin6.sin6_len = sizeof(sin6);
 5332 #endif
 5333         /* First what about the src address of the pkt ? */
 5334         check_src = 0;
 5335         switch (src->sa_family) {
 5336 #ifdef INET
 5337         case AF_INET:
 5338                 if (asoc->scope.ipv4_addr_legal) {
 5339                         check_src = 1;
 5340                 }
 5341                 break;
 5342 #endif
 5343 #ifdef INET6
 5344         case AF_INET6:
 5345                 if (asoc->scope.ipv6_addr_legal) {
 5346                         check_src = 1;
 5347                 }
 5348                 break;
 5349 #endif
 5350         default:
 5351                 /* TSNH */
 5352                 break;
 5353         }
 5354         if (check_src) {
 5355                 fnd = 0;
 5356                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5357                         sa = (struct sockaddr *)&net->ro._l_addr;
 5358                         if (sa->sa_family == src->sa_family) {
 5359 #ifdef INET
 5360                                 if (sa->sa_family == AF_INET) {
 5361                                         struct sockaddr_in *src4;
 5362 
 5363                                         sa4 = (struct sockaddr_in *)sa;
 5364                                         src4 = (struct sockaddr_in *)src;
 5365                                         if (sa4->sin_addr.s_addr == src4->sin_addr.s_addr) {
 5366                                                 fnd = 1;
 5367                                                 break;
 5368                                         }
 5369                                 }
 5370 #endif
 5371 #ifdef INET6
 5372                                 if (sa->sa_family == AF_INET6) {
 5373                                         struct sockaddr_in6 *src6;
 5374 
 5375                                         sa6 = (struct sockaddr_in6 *)sa;
 5376                                         src6 = (struct sockaddr_in6 *)src;
 5377                                         if (SCTP6_ARE_ADDR_EQUAL(sa6, src6)) {
 5378                                                 fnd = 1;
 5379                                                 break;
 5380                                         }
 5381                                 }
 5382 #endif
 5383                         }
 5384                 }
 5385                 if (fnd == 0) {
 5386                         /* New address added! no need to look futher. */
 5387                         return (1);
 5388                 }
 5389         }
 5390         /* Ok so far lets munge through the rest of the packet */
 5391         offset += sizeof(struct sctp_init_chunk);
 5392         phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5393         while (phdr) {
 5394                 sa_touse = NULL;
 5395                 ptype = ntohs(phdr->param_type);
 5396                 plen = ntohs(phdr->param_length);
 5397                 switch (ptype) {
 5398 #ifdef INET
 5399                 case SCTP_IPV4_ADDRESS:
 5400                         {
 5401                                 struct sctp_ipv4addr_param *p4, p4_buf;
 5402 
 5403                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5404                                     (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
 5405                                 if (plen != sizeof(struct sctp_ipv4addr_param) ||
 5406                                     phdr == NULL) {
 5407                                         return (1);
 5408                                 }
 5409                                 if (asoc->scope.ipv4_addr_legal) {
 5410                                         p4 = (struct sctp_ipv4addr_param *)phdr;
 5411                                         sin4.sin_addr.s_addr = p4->addr;
 5412                                         sa_touse = (struct sockaddr *)&sin4;
 5413                                 }
 5414                                 break;
 5415                         }
 5416 #endif
 5417 #ifdef INET6
 5418                 case SCTP_IPV6_ADDRESS:
 5419                         {
 5420                                 struct sctp_ipv6addr_param *p6, p6_buf;
 5421 
 5422                                 phdr = sctp_get_next_param(in_initpkt, offset,
 5423                                     (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
 5424                                 if (plen != sizeof(struct sctp_ipv6addr_param) ||
 5425                                     phdr == NULL) {
 5426                                         return (1);
 5427                                 }
 5428                                 if (asoc->scope.ipv6_addr_legal) {
 5429                                         p6 = (struct sctp_ipv6addr_param *)phdr;
 5430                                         memcpy((caddr_t)&sin6.sin6_addr, p6->addr,
 5431                                             sizeof(p6->addr));
 5432                                         sa_touse = (struct sockaddr *)&sin6;
 5433                                 }
 5434                                 break;
 5435                         }
 5436 #endif
 5437                 default:
 5438                         sa_touse = NULL;
 5439                         break;
 5440                 }
 5441                 if (sa_touse) {
 5442                         /* ok, sa_touse points to one to check */
 5443                         fnd = 0;
 5444                         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 5445                                 sa = (struct sockaddr *)&net->ro._l_addr;
 5446                                 if (sa->sa_family != sa_touse->sa_family) {
 5447                                         continue;
 5448                                 }
 5449 #ifdef INET
 5450                                 if (sa->sa_family == AF_INET) {
 5451                                         sa4 = (struct sockaddr_in *)sa;
 5452                                         if (sa4->sin_addr.s_addr ==
 5453                                             sin4.sin_addr.s_addr) {
 5454                                                 fnd = 1;
 5455                                                 break;
 5456                                         }
 5457                                 }
 5458 #endif
 5459 #ifdef INET6
 5460                                 if (sa->sa_family == AF_INET6) {
 5461                                         sa6 = (struct sockaddr_in6 *)sa;
 5462                                         if (SCTP6_ARE_ADDR_EQUAL(
 5463                                             sa6, &sin6)) {
 5464                                                 fnd = 1;
 5465                                                 break;
 5466                                         }
 5467                                 }
 5468 #endif
 5469                         }
 5470                         if (!fnd) {
 5471                                 /* New addr added! no need to look further */
 5472                                 return (1);
 5473                         }
 5474                 }
 5475                 offset += SCTP_SIZE32(plen);
 5476                 phdr = sctp_get_next_param(in_initpkt, offset, &params, sizeof(params));
 5477         }
 5478         return (0);
 5479 }
 5480 
 5481 /*
 5482  * Given a MBUF chain that was sent into us containing an INIT. Build a
 5483  * INIT-ACK with COOKIE and send back. We assume that the in_initpkt has done
 5484  * a pullup to include IPv6/4header, SCTP header and initial part of INIT
 5485  * message (i.e. the struct sctp_init_msg).
 5486  */
 5487 void
 5488 sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
 5489     struct sctp_nets *src_net, struct mbuf *init_pkt,
 5490     int iphlen, int offset,
 5491     struct sockaddr *src, struct sockaddr *dst,
 5492     struct sctphdr *sh, struct sctp_init_chunk *init_chk,
 5493     uint8_t mflowtype, uint32_t mflowid,
 5494     uint32_t vrf_id, uint16_t port, int hold_inp_lock)
 5495 {
 5496         struct sctp_association *asoc;
 5497         struct mbuf *m, *m_tmp, *m_last, *m_cookie, *op_err;
 5498         struct sctp_init_ack_chunk *initack;
 5499         struct sctp_adaptation_layer_indication *ali;
 5500         struct sctp_supported_chunk_types_param *pr_supported;
 5501         struct sctp_paramhdr *ph;
 5502         union sctp_sockstore *over_addr;
 5503         struct sctp_scoping scp;
 5504 
 5505 #ifdef INET
 5506         struct sockaddr_in *dst4 = (struct sockaddr_in *)dst;
 5507         struct sockaddr_in *src4 = (struct sockaddr_in *)src;
 5508         struct sockaddr_in *sin;
 5509 
 5510 #endif
 5511 #ifdef INET6
 5512         struct sockaddr_in6 *dst6 = (struct sockaddr_in6 *)dst;
 5513         struct sockaddr_in6 *src6 = (struct sockaddr_in6 *)src;
 5514         struct sockaddr_in6 *sin6;
 5515 
 5516 #endif
 5517         struct sockaddr *to;
 5518         struct sctp_state_cookie stc;
 5519         struct sctp_nets *net = NULL;
 5520         uint8_t *signature = NULL;
 5521         int cnt_inits_to = 0;
 5522         uint16_t his_limit, i_want;
 5523         int abort_flag;
 5524         int nat_friendly = 0;
 5525         struct socket *so;
 5526         uint16_t num_ext, chunk_len, padding_len, parameter_len;
 5527 
 5528         if (stcb) {
 5529                 asoc = &stcb->asoc;
 5530         } else {
 5531                 asoc = NULL;
 5532         }
 5533         if ((asoc != NULL) &&
 5534             (SCTP_GET_STATE(asoc) != SCTP_STATE_COOKIE_WAIT)) {
 5535                 if (sctp_are_there_new_addresses(asoc, init_pkt, offset, src)) {
 5536                         /*
 5537                          * new addresses, out of here in non-cookie-wait
 5538                          * states
 5539                          * 
 5540                          * Send an ABORT, without the new address error cause.
 5541                          * This looks no different than if no listener was
 5542                          * present.
 5543                          */
 5544                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5545                             "Address added");
 5546                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5547                             mflowtype, mflowid, inp->fibnum,
 5548                             vrf_id, port);
 5549                         return;
 5550                 }
 5551                 if (src_net != NULL && (src_net->port != port)) {
 5552                         /*
 5553                          * change of remote encapsulation port, out of here
 5554                          * in non-cookie-wait states
 5555                          * 
 5556                          * Send an ABORT, without an specific error cause. This
 5557                          * looks no different than if no listener was
 5558                          * present.
 5559                          */
 5560                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5561                             "Remote encapsulation port changed");
 5562                         sctp_send_abort(init_pkt, iphlen, src, dst, sh, 0, op_err,
 5563                             mflowtype, mflowid, inp->fibnum,
 5564                             vrf_id, port);
 5565                         return;
 5566                 }
 5567         }
 5568         abort_flag = 0;
 5569         op_err = sctp_arethere_unrecognized_parameters(init_pkt,
 5570             (offset + sizeof(struct sctp_init_chunk)),
 5571             &abort_flag, (struct sctp_chunkhdr *)init_chk, &nat_friendly);
 5572         if (abort_flag) {
 5573 do_a_abort:
 5574                 if (op_err == NULL) {
 5575                         char msg[SCTP_DIAG_INFO_LEN];
 5576 
 5577                         snprintf(msg, sizeof(msg), "%s:%d at %s", __FILE__, __LINE__, __func__);
 5578                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 5579                             msg);
 5580                 }
 5581                 sctp_send_abort(init_pkt, iphlen, src, dst, sh,
 5582                     init_chk->init.initiate_tag, op_err,
 5583                     mflowtype, mflowid, inp->fibnum,
 5584                     vrf_id, port);
 5585                 return;
 5586         }
 5587         m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
 5588         if (m == NULL) {
 5589                 /* No memory, INIT timer will re-attempt. */
 5590                 if (op_err)
 5591                         sctp_m_freem(op_err);
 5592                 return;
 5593         }
 5594         chunk_len = (uint16_t) sizeof(struct sctp_init_ack_chunk);
 5595         padding_len = 0;
 5596 
 5597         /*
 5598          * We might not overwrite the identification[] completely and on
 5599          * some platforms time_entered will contain some padding. Therefore
 5600          * zero out the cookie to avoid putting uninitialized memory on the
 5601          * wire.
 5602          */
 5603         memset(&stc, 0, sizeof(struct sctp_state_cookie));
 5604 
 5605         /* the time I built cookie */
 5606         (void)SCTP_GETTIME_TIMEVAL(&stc.time_entered);
 5607 
 5608         /* populate any tie tags */
 5609         if (asoc != NULL) {
 5610                 /* unlock before tag selections */
 5611                 stc.tie_tag_my_vtag = asoc->my_vtag_nonce;
 5612                 stc.tie_tag_peer_vtag = asoc->peer_vtag_nonce;
 5613                 stc.cookie_life = asoc->cookie_life;
 5614                 net = asoc->primary_destination;
 5615         } else {
 5616                 stc.tie_tag_my_vtag = 0;
 5617                 stc.tie_tag_peer_vtag = 0;
 5618                 /* life I will award this cookie */
 5619                 stc.cookie_life = inp->sctp_ep.def_cookie_life;
 5620         }
 5621 
 5622         /* copy in the ports for later check */
 5623         stc.myport = sh->dest_port;
 5624         stc.peerport = sh->src_port;
 5625 
 5626         /*
 5627          * If we wanted to honor cookie life extentions, we would add to
 5628          * stc.cookie_life. For now we should NOT honor any extension
 5629          */
 5630         stc.site_scope = stc.local_scope = stc.loopback_scope = 0;
 5631         if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 5632                 stc.ipv6_addr_legal = 1;
 5633                 if (SCTP_IPV6_V6ONLY(inp)) {
 5634                         stc.ipv4_addr_legal = 0;
 5635                 } else {
 5636                         stc.ipv4_addr_legal = 1;
 5637                 }
 5638         } else {
 5639                 stc.ipv6_addr_legal = 0;
 5640                 stc.ipv4_addr_legal = 1;
 5641         }
 5642         stc.ipv4_scope = 0;
 5643         if (net == NULL) {
 5644                 to = src;
 5645                 switch (dst->sa_family) {
 5646 #ifdef INET
 5647                 case AF_INET:
 5648                         {
 5649                                 /* lookup address */
 5650                                 stc.address[0] = src4->sin_addr.s_addr;
 5651                                 stc.address[1] = 0;
 5652                                 stc.address[2] = 0;
 5653                                 stc.address[3] = 0;
 5654                                 stc.addr_type = SCTP_IPV4_ADDRESS;
 5655                                 /* local from address */
 5656                                 stc.laddress[0] = dst4->sin_addr.s_addr;
 5657                                 stc.laddress[1] = 0;
 5658                                 stc.laddress[2] = 0;
 5659                                 stc.laddress[3] = 0;
 5660                                 stc.laddr_type = SCTP_IPV4_ADDRESS;
 5661                                 /* scope_id is only for v6 */
 5662                                 stc.scope_id = 0;
 5663                                 if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
 5664                                     (IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
 5665                                         stc.ipv4_scope = 1;
 5666                                 }
 5667                                 /* Must use the address in this case */
 5668                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5669                                         stc.loopback_scope = 1;
 5670                                         stc.ipv4_scope = 1;
 5671                                         stc.site_scope = 1;
 5672                                         stc.local_scope = 0;
 5673                                 }
 5674                                 break;
 5675                         }
 5676 #endif
 5677 #ifdef INET6
 5678                 case AF_INET6:
 5679                         {
 5680                                 stc.addr_type = SCTP_IPV6_ADDRESS;
 5681                                 memcpy(&stc.address, &src6->sin6_addr, sizeof(struct in6_addr));
 5682                                 stc.scope_id = in6_getscope(&src6->sin6_addr);
 5683                                 if (sctp_is_address_on_local_host(src, vrf_id)) {
 5684                                         stc.loopback_scope = 1;
 5685                                         stc.local_scope = 0;
 5686                                         stc.site_scope = 1;
 5687                                         stc.ipv4_scope = 1;
 5688                                 } else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
 5689                                     IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
 5690                                         /*
 5691                                          * If the new destination or source
 5692                                          * is a LINK_LOCAL we must have
 5693                                          * common both site and local scope.
 5694                                          * Don't set local scope though
 5695                                          * since we must depend on the
 5696                                          * source to be added implicitly. We
 5697                                          * cannot assure just because we
 5698                                          * share one link that all links are
 5699                                          * common.
 5700                                          */
 5701                                         stc.local_scope = 0;
 5702                                         stc.site_scope = 1;
 5703                                         stc.ipv4_scope = 1;
 5704                                         /*
 5705                                          * we start counting for the private
 5706                                          * address stuff at 1. since the
 5707                                          * link local we source from won't
 5708                                          * show up in our scoped count.
 5709                                          */
 5710                                         cnt_inits_to = 1;
 5711                                         /*
 5712                                          * pull out the scope_id from
 5713                                          * incoming pkt
 5714                                          */
 5715                                 } else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
 5716                                     IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
 5717                                         /*
 5718                                          * If the new destination or source
 5719                                          * is SITE_LOCAL then we must have
 5720                                          * site scope in common.
 5721                                          */
 5722                                         stc.site_scope = 1;
 5723                                 }
 5724                                 memcpy(&stc.laddress, &dst6->sin6_addr, sizeof(struct in6_addr));
 5725                                 stc.laddr_type = SCTP_IPV6_ADDRESS;
 5726                                 break;
 5727                         }
 5728 #endif
 5729                 default:
 5730                         /* TSNH */
 5731                         goto do_a_abort;
 5732                         break;
 5733                 }
 5734         } else {
 5735                 /* set the scope per the existing tcb */
 5736 
 5737 #ifdef INET6
 5738                 struct sctp_nets *lnet;
 5739 
 5740 #endif
 5741 
 5742                 stc.loopback_scope = asoc->scope.loopback_scope;
 5743                 stc.ipv4_scope = asoc->scope.ipv4_local_scope;
 5744                 stc.site_scope = asoc->scope.site_scope;
 5745                 stc.local_scope = asoc->scope.local_scope;
 5746 #ifdef INET6
 5747                 /* Why do we not consider IPv4 LL addresses? */
 5748                 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
 5749                         if (lnet->ro._l_addr.sin6.sin6_family == AF_INET6) {
 5750                                 if (IN6_IS_ADDR_LINKLOCAL(&lnet->ro._l_addr.sin6.sin6_addr)) {
 5751                                         /*
 5752                                          * if we have a LL address, start
 5753                                          * counting at 1.
 5754                                          */
 5755                                         cnt_inits_to = 1;
 5756                                 }
 5757                         }
 5758                 }
 5759 #endif
 5760                 /* use the net pointer */
 5761                 to = (struct sockaddr *)&net->ro._l_addr;
 5762                 switch (to->sa_family) {
 5763 #ifdef INET
 5764                 case AF_INET:
 5765                         sin = (struct sockaddr_in *)to;
 5766                         stc.address[0] = sin->sin_addr.s_addr;
 5767                         stc.address[1] = 0;
 5768                         stc.address[2] = 0;
 5769                         stc.address[3] = 0;
 5770                         stc.addr_type = SCTP_IPV4_ADDRESS;
 5771                         if (net->src_addr_selected == 0) {
 5772                                 /*
 5773                                  * strange case here, the INIT should have
 5774                                  * did the selection.
 5775                                  */
 5776                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5777                                     stcb, (sctp_route_t *) & net->ro,
 5778                                     net, 0, vrf_id);
 5779                                 if (net->ro._s_addr == NULL)
 5780                                         return;
 5781 
 5782                                 net->src_addr_selected = 1;
 5783 
 5784                         }
 5785                         stc.laddress[0] = net->ro._s_addr->address.sin.sin_addr.s_addr;
 5786                         stc.laddress[1] = 0;
 5787                         stc.laddress[2] = 0;
 5788                         stc.laddress[3] = 0;
 5789                         stc.laddr_type = SCTP_IPV4_ADDRESS;
 5790                         /* scope_id is only for v6 */
 5791                         stc.scope_id = 0;
 5792                         break;
 5793 #endif
 5794 #ifdef INET6
 5795                 case AF_INET6:
 5796                         sin6 = (struct sockaddr_in6 *)to;
 5797                         memcpy(&stc.address, &sin6->sin6_addr,
 5798                             sizeof(struct in6_addr));
 5799                         stc.addr_type = SCTP_IPV6_ADDRESS;
 5800                         stc.scope_id = sin6->sin6_scope_id;
 5801                         if (net->src_addr_selected == 0) {
 5802                                 /*
 5803                                  * strange case here, the INIT should have
 5804                                  * done the selection.
 5805                                  */
 5806                                 net->ro._s_addr = sctp_source_address_selection(inp,
 5807                                     stcb, (sctp_route_t *) & net->ro,
 5808                                     net, 0, vrf_id);
 5809                                 if (net->ro._s_addr == NULL)
 5810                                         return;
 5811 
 5812                                 net->src_addr_selected = 1;
 5813                         }
 5814                         memcpy(&stc.laddress, &net->ro._s_addr->address.sin6.sin6_addr,
 5815                             sizeof(struct in6_addr));
 5816                         stc.laddr_type = SCTP_IPV6_ADDRESS;
 5817                         break;
 5818 #endif
 5819                 }
 5820         }
 5821         /* Now lets put the SCTP header in place */
 5822         initack = mtod(m, struct sctp_init_ack_chunk *);
 5823         /* Save it off for quick ref */
 5824         stc.peers_vtag = init_chk->init.initiate_tag;
 5825         /* who are we */
 5826         memcpy(stc.identification, SCTP_VERSION_STRING,
 5827             min(strlen(SCTP_VERSION_STRING), sizeof(stc.identification)));
 5828         memset(stc.reserved, 0, SCTP_RESERVE_SPACE);
 5829         /* now the chunk header */
 5830         initack->ch.chunk_type = SCTP_INITIATION_ACK;
 5831         initack->ch.chunk_flags = 0;
 5832         /* fill in later from mbuf we build */
 5833         initack->ch.chunk_length = 0;
 5834         /* place in my tag */
 5835         if ((asoc != NULL) &&
 5836             ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
 5837             (SCTP_GET_STATE(asoc) == SCTP_STATE_INUSE) ||
 5838             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED))) {
 5839                 /* re-use the v-tags and init-seq here */
 5840                 initack->init.initiate_tag = htonl(asoc->my_vtag);
 5841                 initack->init.initial_tsn = htonl(asoc->init_seq_number);
 5842         } else {
 5843                 uint32_t vtag, itsn;
 5844 
 5845                 if (hold_inp_lock) {
 5846                         SCTP_INP_INCR_REF(inp);
 5847                         SCTP_INP_RUNLOCK(inp);
 5848                 }
 5849                 if (asoc) {
 5850                         atomic_add_int(&asoc->refcnt, 1);
 5851                         SCTP_TCB_UNLOCK(stcb);
 5852         new_tag:
 5853                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5854                         if ((asoc->peer_supports_nat) && (vtag == asoc->my_vtag)) {
 5855                                 /*
 5856                                  * Got a duplicate vtag on some guy behind a
 5857                                  * nat make sure we don't use it.
 5858                                  */
 5859                                 goto new_tag;
 5860                         }
 5861                         initack->init.initiate_tag = htonl(vtag);
 5862                         /* get a TSN to use too */
 5863                         itsn = sctp_select_initial_TSN(&inp->sctp_ep);
 5864                         initack->init.initial_tsn = htonl(itsn);
 5865                         SCTP_TCB_LOCK(stcb);
 5866                         atomic_add_int(&asoc->refcnt, -1);
 5867                 } else {
 5868                         vtag = sctp_select_a_tag(inp, inp->sctp_lport, sh->src_port, 1);
 5869                         initack->init.initiate_tag = htonl(vtag);
 5870                         /* get a TSN to use too */
 5871                         initack->init.initial_tsn = htonl(sctp_select_initial_TSN(&inp->sctp_ep));
 5872                 }
 5873                 if (hold_inp_lock) {
 5874                         SCTP_INP_RLOCK(inp);
 5875                         SCTP_INP_DECR_REF(inp);
 5876                 }
 5877         }
 5878         /* save away my tag to */
 5879         stc.my_vtag = initack->init.initiate_tag;
 5880 
 5881         /* set up some of the credits. */
 5882         so = inp->sctp_socket;
 5883         if (so == NULL) {
 5884                 /* memory problem */
 5885                 sctp_m_freem(m);
 5886                 return;
 5887         } else {
 5888                 initack->init.a_rwnd = htonl(max(SCTP_SB_LIMIT_RCV(so), SCTP_MINIMAL_RWND));
 5889         }
 5890         /* set what I want */
 5891         his_limit = ntohs(init_chk->init.num_inbound_streams);
 5892         /* choose what I want */
 5893         if (asoc != NULL) {
 5894                 if (asoc->streamoutcnt > asoc->pre_open_streams) {
 5895                         i_want = asoc->streamoutcnt;
 5896                 } else {
 5897                         i_want = asoc->pre_open_streams;
 5898                 }
 5899         } else {
 5900                 i_want = inp->sctp_ep.pre_open_stream_count;
 5901         }
 5902         if (his_limit < i_want) {
 5903                 /* I Want more :< */
 5904                 initack->init.num_outbound_streams = init_chk->init.num_inbound_streams;
 5905         } else {
 5906                 /* I can have what I want :> */
 5907                 initack->init.num_outbound_streams = htons(i_want);
 5908         }
 5909         /* tell him his limit. */
 5910         initack->init.num_inbound_streams =
 5911             htons(inp->sctp_ep.max_open_streams_intome);
 5912 
 5913         /* adaptation layer indication parameter */
 5914         if (inp->sctp_ep.adaptation_layer_indicator_provided) {
 5915                 parameter_len = (uint16_t) sizeof(struct sctp_adaptation_layer_indication);
 5916                 ali = (struct sctp_adaptation_layer_indication *)(mtod(m, caddr_t)+chunk_len);
 5917                 ali->ph.param_type = htons(SCTP_ULP_ADAPTATION);
 5918                 ali->ph.param_length = htons(parameter_len);
 5919                 ali->indication = htonl(inp->sctp_ep.adaptation_layer_indicator);
 5920                 chunk_len += parameter_len;
 5921         }
 5922         /* ECN parameter */
 5923         if (((asoc != NULL) && (asoc->ecn_supported == 1)) ||
 5924             ((asoc == NULL) && (inp->ecn_supported == 1))) {
 5925                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 5926                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5927                 ph->param_type = htons(SCTP_ECN_CAPABLE);
 5928                 ph->param_length = htons(parameter_len);
 5929                 chunk_len += parameter_len;
 5930         }
 5931         /* PR-SCTP supported parameter */
 5932         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5933             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5934                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 5935                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5936                 ph->param_type = htons(SCTP_PRSCTP_SUPPORTED);
 5937                 ph->param_length = htons(parameter_len);
 5938                 chunk_len += parameter_len;
 5939         }
 5940         /* Add NAT friendly parameter */
 5941         if (nat_friendly) {
 5942                 parameter_len = (uint16_t) sizeof(struct sctp_paramhdr);
 5943                 ph = (struct sctp_paramhdr *)(mtod(m, caddr_t)+chunk_len);
 5944                 ph->param_type = htons(SCTP_HAS_NAT_SUPPORT);
 5945                 ph->param_length = htons(parameter_len);
 5946                 chunk_len += parameter_len;
 5947         }
 5948         /* And now tell the peer which extensions we support */
 5949         num_ext = 0;
 5950         pr_supported = (struct sctp_supported_chunk_types_param *)(mtod(m, caddr_t)+chunk_len);
 5951         if (((asoc != NULL) && (asoc->prsctp_supported == 1)) ||
 5952             ((asoc == NULL) && (inp->prsctp_supported == 1))) {
 5953                 pr_supported->chunk_types[num_ext++] = SCTP_FORWARD_CUM_TSN;
 5954         }
 5955         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5956             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5957                 pr_supported->chunk_types[num_ext++] = SCTP_AUTHENTICATION;
 5958         }
 5959         if (((asoc != NULL) && (asoc->asconf_supported == 1)) ||
 5960             ((asoc == NULL) && (inp->asconf_supported == 1))) {
 5961                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF;
 5962                 pr_supported->chunk_types[num_ext++] = SCTP_ASCONF_ACK;
 5963         }
 5964         if (((asoc != NULL) && (asoc->reconfig_supported == 1)) ||
 5965             ((asoc == NULL) && (inp->reconfig_supported == 1))) {
 5966                 pr_supported->chunk_types[num_ext++] = SCTP_STREAM_RESET;
 5967         }
 5968         if (((asoc != NULL) && (asoc->nrsack_supported == 1)) ||
 5969             ((asoc == NULL) && (inp->nrsack_supported == 1))) {
 5970                 pr_supported->chunk_types[num_ext++] = SCTP_NR_SELECTIVE_ACK;
 5971         }
 5972         if (((asoc != NULL) && (asoc->pktdrop_supported == 1)) ||
 5973             ((asoc == NULL) && (inp->pktdrop_supported == 1))) {
 5974                 pr_supported->chunk_types[num_ext++] = SCTP_PACKET_DROPPED;
 5975         }
 5976         if (num_ext > 0) {
 5977                 parameter_len = (uint16_t) sizeof(struct sctp_supported_chunk_types_param) + num_ext;
 5978                 pr_supported->ph.param_type = htons(SCTP_SUPPORTED_CHUNK_EXT);
 5979                 pr_supported->ph.param_length = htons(parameter_len);
 5980                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 5981                 chunk_len += parameter_len;
 5982         }
 5983         /* add authentication parameters */
 5984         if (((asoc != NULL) && (asoc->auth_supported == 1)) ||
 5985             ((asoc == NULL) && (inp->auth_supported == 1))) {
 5986                 struct sctp_auth_random *randp;
 5987                 struct sctp_auth_hmac_algo *hmacs;
 5988                 struct sctp_auth_chunk_list *chunks;
 5989 
 5990                 if (padding_len > 0) {
 5991                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 5992                         chunk_len += padding_len;
 5993                         padding_len = 0;
 5994                 }
 5995                 /* generate and add RANDOM parameter */
 5996                 randp = (struct sctp_auth_random *)(mtod(m, caddr_t)+chunk_len);
 5997                 parameter_len = (uint16_t) sizeof(struct sctp_auth_random) +
 5998                     SCTP_AUTH_RANDOM_SIZE_DEFAULT;
 5999                 randp->ph.param_type = htons(SCTP_RANDOM);
 6000                 randp->ph.param_length = htons(parameter_len);
 6001                 SCTP_READ_RANDOM(randp->random_data, SCTP_AUTH_RANDOM_SIZE_DEFAULT);
 6002                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6003                 chunk_len += parameter_len;
 6004 
 6005                 if (padding_len > 0) {
 6006                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6007                         chunk_len += padding_len;
 6008                         padding_len = 0;
 6009                 }
 6010                 /* add HMAC_ALGO parameter */
 6011                 hmacs = (struct sctp_auth_hmac_algo *)(mtod(m, caddr_t)+chunk_len);
 6012                 parameter_len = (uint16_t) sizeof(struct sctp_auth_hmac_algo) +
 6013                     sctp_serialize_hmaclist(inp->sctp_ep.local_hmacs,
 6014                     (uint8_t *) hmacs->hmac_ids);
 6015                 hmacs->ph.param_type = htons(SCTP_HMAC_LIST);
 6016                 hmacs->ph.param_length = htons(parameter_len);
 6017                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6018                 chunk_len += parameter_len;
 6019 
 6020                 if (padding_len > 0) {
 6021                         memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6022                         chunk_len += padding_len;
 6023                         padding_len = 0;
 6024                 }
 6025                 /* add CHUNKS parameter */
 6026                 chunks = (struct sctp_auth_chunk_list *)(mtod(m, caddr_t)+chunk_len);
 6027                 parameter_len = (uint16_t) sizeof(struct sctp_auth_chunk_list) +
 6028                     sctp_serialize_auth_chunks(inp->sctp_ep.local_auth_chunks,
 6029                     chunks->chunk_types);
 6030                 chunks->ph.param_type = htons(SCTP_CHUNK_LIST);
 6031                 chunks->ph.param_length = htons(parameter_len);
 6032                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6033                 chunk_len += parameter_len;
 6034         }
 6035         SCTP_BUF_LEN(m) = chunk_len;
 6036         m_last = m;
 6037         /* now the addresses */
 6038         /*
 6039          * To optimize this we could put the scoping stuff into a structure
 6040          * and remove the individual uint8's from the stc structure. Then we
 6041          * could just sifa in the address within the stc.. but for now this
 6042          * is a quick hack to get the address stuff teased apart.
 6043          */
 6044         scp.ipv4_addr_legal = stc.ipv4_addr_legal;
 6045         scp.ipv6_addr_legal = stc.ipv6_addr_legal;
 6046         scp.loopback_scope = stc.loopback_scope;
 6047         scp.ipv4_local_scope = stc.ipv4_scope;
 6048         scp.local_scope = stc.local_scope;
 6049         scp.site_scope = stc.site_scope;
 6050         m_last = sctp_add_addresses_to_i_ia(inp, stcb, &scp, m_last,
 6051             cnt_inits_to,
 6052             &padding_len, &chunk_len);
 6053         /* padding_len can only be positive, if no addresses have been added */
 6054         if (padding_len > 0) {
 6055                 memset(mtod(m, caddr_t)+chunk_len, 0, padding_len);
 6056                 chunk_len += padding_len;
 6057                 SCTP_BUF_LEN(m) += padding_len;
 6058                 padding_len = 0;
 6059         }
 6060         /* tack on the operational error if present */
 6061         if (op_err) {
 6062                 parameter_len = 0;
 6063                 for (m_tmp = op_err; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6064                         parameter_len += SCTP_BUF_LEN(m_tmp);
 6065                 }
 6066                 padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6067                 SCTP_BUF_NEXT(m_last) = op_err;
 6068                 while (SCTP_BUF_NEXT(m_last) != NULL) {
 6069                         m_last = SCTP_BUF_NEXT(m_last);
 6070                 }
 6071                 chunk_len += parameter_len;
 6072         }
 6073         if (padding_len > 0) {
 6074                 m_last = sctp_add_pad_tombuf(m_last, padding_len);
 6075                 if (m_last == NULL) {
 6076                         /* Houston we have a problem, no space */
 6077                         sctp_m_freem(m);
 6078                         return;
 6079                 }
 6080                 chunk_len += padding_len;
 6081                 padding_len = 0;
 6082         }
 6083         /* Now we must build a cookie */
 6084         m_cookie = sctp_add_cookie(init_pkt, offset, m, 0, &stc, &signature);
 6085         if (m_cookie == NULL) {
 6086                 /* memory problem */
 6087                 sctp_m_freem(m);
 6088                 return;
 6089         }
 6090         /* Now append the cookie to the end and update the space/size */
 6091         SCTP_BUF_NEXT(m_last) = m_cookie;
 6092         parameter_len = 0;
 6093         for (m_tmp = m_cookie; m_tmp != NULL; m_tmp = SCTP_BUF_NEXT(m_tmp)) {
 6094                 parameter_len += SCTP_BUF_LEN(m_tmp);
 6095                 if (SCTP_BUF_NEXT(m_tmp) == NULL) {
 6096                         m_last = m_tmp;
 6097                 }
 6098         }
 6099         padding_len = SCTP_SIZE32(parameter_len) - parameter_len;
 6100         chunk_len += parameter_len;
 6101 
 6102         /*
 6103          * Place in the size, but we don't include the last pad (if any) in
 6104          * the INIT-ACK.
 6105          */
 6106         initack->ch.chunk_length = htons(chunk_len);
 6107 
 6108         /*
 6109          * Time to sign the cookie, we don't sign over the cookie signature
 6110          * though thus we set trailer.
 6111          */
 6112         (void)sctp_hmac_m(SCTP_HMAC,
 6113             (uint8_t *) inp->sctp_ep.secret_key[(int)(inp->sctp_ep.current_secret_number)],
 6114             SCTP_SECRET_SIZE, m_cookie, sizeof(struct sctp_paramhdr),
 6115             (uint8_t *) signature, SCTP_SIGNATURE_SIZE);
 6116         /*
 6117          * We sifa 0 here to NOT set IP_DF if its IPv4, we ignore the return
 6118          * here since the timer will drive a retranmission.
 6119          */
 6120         if (padding_len > 0) {
 6121                 if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
 6122                         sctp_m_freem(m);
 6123                         return;
 6124                 }
 6125         }
 6126         if (stc.loopback_scope) {
 6127                 over_addr = (union sctp_sockstore *)dst;
 6128         } else {
 6129                 over_addr = NULL;
 6130         }
 6131 
 6132         (void)sctp_lowlevel_chunk_output(inp, NULL, NULL, to, m, 0, NULL, 0, 0,
 6133             0, 0,
 6134             inp->sctp_lport, sh->src_port, init_chk->init.initiate_tag,
 6135             port, over_addr,
 6136             mflowtype, mflowid,
 6137             SCTP_SO_NOT_LOCKED);
 6138         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 6139 }
 6140 
 6141 
 6142 static void
 6143 sctp_prune_prsctp(struct sctp_tcb *stcb,
 6144     struct sctp_association *asoc,
 6145     struct sctp_sndrcvinfo *srcv,
 6146     int dataout)
 6147 {
 6148         int freed_spc = 0;
 6149         struct sctp_tmit_chunk *chk, *nchk;
 6150 
 6151         SCTP_TCB_LOCK_ASSERT(stcb);
 6152         if ((asoc->prsctp_supported) &&
 6153             (asoc->sent_queue_cnt_removeable > 0)) {
 6154                 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 6155                         /*
 6156                          * Look for chunks marked with the PR_SCTP flag AND
 6157                          * the buffer space flag. If the one being sent is
 6158                          * equal or greater priority then purge the old one
 6159                          * and free some space.
 6160                          */
 6161                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6162                                 /*
 6163                                  * This one is PR-SCTP AND buffer space
 6164                                  * limited type
 6165                                  */
 6166                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6167                                         /*
 6168                                          * Lower numbers equates to higher
 6169                                          * priority so if the one we are
 6170                                          * looking at has a larger or equal
 6171                                          * priority we want to drop the data
 6172                                          * and NOT retransmit it.
 6173                                          */
 6174                                         if (chk->data) {
 6175                                                 /*
 6176                                                  * We release the book_size
 6177                                                  * if the mbuf is here
 6178                                                  */
 6179                                                 int ret_spc;
 6180                                                 uint8_t sent;
 6181 
 6182                                                 if (chk->sent > SCTP_DATAGRAM_UNSENT)
 6183                                                         sent = 1;
 6184                                                 else
 6185                                                         sent = 0;
 6186                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6187                                                     sent,
 6188                                                     SCTP_SO_LOCKED);
 6189                                                 freed_spc += ret_spc;
 6190                                                 if (freed_spc >= dataout) {
 6191                                                         return;
 6192                                                 }
 6193                                         }       /* if chunk was present */
 6194                                 }       /* if of sufficent priority */
 6195                         }       /* if chunk has enabled */
 6196                 }               /* tailqforeach */
 6197 
 6198                 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 6199                         /* Here we must move to the sent queue and mark */
 6200                         if (PR_SCTP_BUF_ENABLED(chk->flags)) {
 6201                                 if (chk->rec.data.timetodrop.tv_sec >= (long)srcv->sinfo_timetolive) {
 6202                                         if (chk->data) {
 6203                                                 /*
 6204                                                  * We release the book_size
 6205                                                  * if the mbuf is here
 6206                                                  */
 6207                                                 int ret_spc;
 6208 
 6209                                                 ret_spc = sctp_release_pr_sctp_chunk(stcb, chk,
 6210                                                     0, SCTP_SO_LOCKED);
 6211 
 6212                                                 freed_spc += ret_spc;
 6213                                                 if (freed_spc >= dataout) {
 6214                                                         return;
 6215                                                 }
 6216                                         }       /* end if chk->data */
 6217                                 }       /* end if right class */
 6218                         }       /* end if chk pr-sctp */
 6219                 }               /* tailqforeachsafe (chk) */
 6220         }                       /* if enabled in asoc */
 6221 }
 6222 
 6223 int
 6224 sctp_get_frag_point(struct sctp_tcb *stcb,
 6225     struct sctp_association *asoc)
 6226 {
 6227         int siz, ovh;
 6228 
 6229         /*
 6230          * For endpoints that have both v6 and v4 addresses we must reserve
 6231          * room for the ipv6 header, for those that are only dealing with V4
 6232          * we use a larger frag point.
 6233          */
 6234         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
 6235                 ovh = SCTP_MED_OVERHEAD;
 6236         } else {
 6237                 ovh = SCTP_MED_V4_OVERHEAD;
 6238         }
 6239 
 6240         if (stcb->asoc.sctp_frag_point > asoc->smallest_mtu)
 6241                 siz = asoc->smallest_mtu - ovh;
 6242         else
 6243                 siz = (stcb->asoc.sctp_frag_point - ovh);
 6244         /*
 6245          * if (siz > (MCLBYTES-sizeof(struct sctp_data_chunk))) {
 6246          */
 6247         /* A data chunk MUST fit in a cluster */
 6248         /* siz = (MCLBYTES - sizeof(struct sctp_data_chunk)); */
 6249         /* } */
 6250 
 6251         /* adjust for an AUTH chunk if DATA requires auth */
 6252         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks))
 6253                 siz -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 6254 
 6255         if (siz % 4) {
 6256                 /* make it an even word boundary please */
 6257                 siz -= (siz % 4);
 6258         }
 6259         return (siz);
 6260 }
 6261 
 6262 static void
 6263 sctp_set_prsctp_policy(struct sctp_stream_queue_pending *sp)
 6264 {
 6265         /*
 6266          * We assume that the user wants PR_SCTP_TTL if the user provides a
 6267          * positive lifetime but does not specify any PR_SCTP policy.
 6268          */
 6269         if (PR_SCTP_ENABLED(sp->sinfo_flags)) {
 6270                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6271         } else if (sp->timetolive > 0) {
 6272                 sp->sinfo_flags |= SCTP_PR_SCTP_TTL;
 6273                 sp->act_flags |= PR_SCTP_POLICY(sp->sinfo_flags);
 6274         } else {
 6275                 return;
 6276         }
 6277         switch (PR_SCTP_POLICY(sp->sinfo_flags)) {
 6278         case CHUNK_FLAGS_PR_SCTP_BUF:
 6279                 /*
 6280                  * Time to live is a priority stored in tv_sec when doing
 6281                  * the buffer drop thing.
 6282                  */
 6283                 sp->ts.tv_sec = sp->timetolive;
 6284                 sp->ts.tv_usec = 0;
 6285                 break;
 6286         case CHUNK_FLAGS_PR_SCTP_TTL:
 6287                 {
 6288                         struct timeval tv;
 6289 
 6290                         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6291                         tv.tv_sec = sp->timetolive / 1000;
 6292                         tv.tv_usec = (sp->timetolive * 1000) % 1000000;
 6293                         /*
 6294                          * TODO sctp_constants.h needs alternative time
 6295                          * macros when _KERNEL is undefined.
 6296                          */
 6297                         timevaladd(&sp->ts, &tv);
 6298                 }
 6299                 break;
 6300         case CHUNK_FLAGS_PR_SCTP_RTX:
 6301                 /*
 6302                  * Time to live is a the number or retransmissions stored in
 6303                  * tv_sec.
 6304                  */
 6305                 sp->ts.tv_sec = sp->timetolive;
 6306                 sp->ts.tv_usec = 0;
 6307                 break;
 6308         default:
 6309                 SCTPDBG(SCTP_DEBUG_USRREQ1,
 6310                     "Unknown PR_SCTP policy %u.\n",
 6311                     PR_SCTP_POLICY(sp->sinfo_flags));
 6312                 break;
 6313         }
 6314 }
 6315 
 6316 static int
 6317 sctp_msg_append(struct sctp_tcb *stcb,
 6318     struct sctp_nets *net,
 6319     struct mbuf *m,
 6320     struct sctp_sndrcvinfo *srcv, int hold_stcb_lock)
 6321 {
 6322         int error = 0;
 6323         struct mbuf *at;
 6324         struct sctp_stream_queue_pending *sp = NULL;
 6325         struct sctp_stream_out *strm;
 6326 
 6327         /*
 6328          * Given an mbuf chain, put it into the association send queue and
 6329          * place it on the wheel
 6330          */
 6331         if (srcv->sinfo_stream >= stcb->asoc.streamoutcnt) {
 6332                 /* Invalid stream number */
 6333                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6334                 error = EINVAL;
 6335                 goto out_now;
 6336         }
 6337         if ((stcb->asoc.stream_locked) &&
 6338             (stcb->asoc.stream_locked_on != srcv->sinfo_stream)) {
 6339                 SCTP_LTRACE_ERR_RET_PKT(m, NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
 6340                 error = EINVAL;
 6341                 goto out_now;
 6342         }
 6343         strm = &stcb->asoc.strmout[srcv->sinfo_stream];
 6344         /* Now can we send this? */
 6345         if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
 6346             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
 6347             (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
 6348             (stcb->asoc.state & SCTP_STATE_SHUTDOWN_PENDING)) {
 6349                 /* got data while shutting down */
 6350                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
 6351                 error = ECONNRESET;
 6352                 goto out_now;
 6353         }
 6354         sctp_alloc_a_strmoq(stcb, sp);
 6355         if (sp == NULL) {
 6356                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6357                 error = ENOMEM;
 6358                 goto out_now;
 6359         }
 6360         sp->sinfo_flags = srcv->sinfo_flags;
 6361         sp->timetolive = srcv->sinfo_timetolive;
 6362         sp->ppid = srcv->sinfo_ppid;
 6363         sp->context = srcv->sinfo_context;
 6364         if (sp->sinfo_flags & SCTP_ADDR_OVER) {
 6365                 sp->net = net;
 6366                 atomic_add_int(&sp->net->ref_count, 1);
 6367         } else {
 6368                 sp->net = NULL;
 6369         }
 6370         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
 6371         sp->stream = srcv->sinfo_stream;
 6372         sp->msg_is_complete = 1;
 6373         sp->sender_all_done = 1;
 6374         sp->some_taken = 0;
 6375         sp->data = m;
 6376         sp->tail_mbuf = NULL;
 6377         sctp_set_prsctp_policy(sp);
 6378         /*
 6379          * We could in theory (for sendall) sifa the length in, but we would
 6380          * still have to hunt through the chain since we need to setup the
 6381          * tail_mbuf
 6382          */
 6383         sp->length = 0;
 6384         for (at = m; at; at = SCTP_BUF_NEXT(at)) {
 6385                 if (SCTP_BUF_NEXT(at) == NULL)
 6386                         sp->tail_mbuf = at;
 6387                 sp->length += SCTP_BUF_LEN(at);
 6388         }
 6389         if (srcv->sinfo_keynumber_valid) {
 6390                 sp->auth_keyid = srcv->sinfo_keynumber;
 6391         } else {
 6392                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
 6393         }
 6394         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
 6395                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
 6396                 sp->holds_key_ref = 1;
 6397         }
 6398         if (hold_stcb_lock == 0) {
 6399                 SCTP_TCB_SEND_LOCK(stcb);
 6400         }
 6401         sctp_snd_sb_alloc(stcb, sp->length);
 6402         atomic_add_int(&stcb->asoc.stream_queue_cnt, 1);
 6403         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
 6404         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, &stcb->asoc, strm, sp, 1);
 6405         m = NULL;
 6406         if (hold_stcb_lock == 0) {
 6407                 SCTP_TCB_SEND_UNLOCK(stcb);
 6408         }
 6409 out_now:
 6410         if (m) {
 6411                 sctp_m_freem(m);
 6412         }
 6413         return (error);
 6414 }
 6415 
 6416 
 6417 static struct mbuf *
 6418 sctp_copy_mbufchain(struct mbuf *clonechain,
 6419     struct mbuf *outchain,
 6420     struct mbuf **endofchain,
 6421     int can_take_mbuf,
 6422     int sizeofcpy,
 6423     uint8_t copy_by_ref)
 6424 {
 6425         struct mbuf *m;
 6426         struct mbuf *appendchain;
 6427         caddr_t cp;
 6428         int len;
 6429 
 6430         if (endofchain == NULL) {
 6431                 /* error */
 6432 error_out:
 6433                 if (outchain)
 6434                         sctp_m_freem(outchain);
 6435                 return (NULL);
 6436         }
 6437         if (can_take_mbuf) {
 6438                 appendchain = clonechain;
 6439         } else {
 6440                 if (!copy_by_ref &&
 6441                     (sizeofcpy <= (int)((((SCTP_BASE_SYSCTL(sctp_mbuf_threshold_count) - 1) * MLEN) + MHLEN)))
 6442                     ) {
 6443                         /* Its not in a cluster */
 6444                         if (*endofchain == NULL) {
 6445                                 /* lets get a mbuf cluster */
 6446                                 if (outchain == NULL) {
 6447                                         /* This is the general case */
 6448                         new_mbuf:
 6449                                         outchain = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6450                                         if (outchain == NULL) {
 6451                                                 goto error_out;
 6452                                         }
 6453                                         SCTP_BUF_LEN(outchain) = 0;
 6454                                         *endofchain = outchain;
 6455                                         /* get the prepend space */
 6456                                         SCTP_BUF_RESV_UF(outchain, (SCTP_FIRST_MBUF_RESV + 4));
 6457                                 } else {
 6458                                         /*
 6459                                          * We really should not get a NULL
 6460                                          * in endofchain
 6461                                          */
 6462                                         /* find end */
 6463                                         m = outchain;
 6464                                         while (m) {
 6465                                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6466                                                         *endofchain = m;
 6467                                                         break;
 6468                                                 }
 6469                                                 m = SCTP_BUF_NEXT(m);
 6470                                         }
 6471                                         /* sanity */
 6472                                         if (*endofchain == NULL) {
 6473                                                 /*
 6474                                                  * huh, TSNH XXX maybe we
 6475                                                  * should panic
 6476                                                  */
 6477                                                 sctp_m_freem(outchain);
 6478                                                 goto new_mbuf;
 6479                                         }
 6480                                 }
 6481                                 /* get the new end of length */
 6482                                 len = M_TRAILINGSPACE(*endofchain);
 6483                         } else {
 6484                                 /* how much is left at the end? */
 6485                                 len = M_TRAILINGSPACE(*endofchain);
 6486                         }
 6487                         /* Find the end of the data, for appending */
 6488                         cp = (mtod((*endofchain), caddr_t)+SCTP_BUF_LEN((*endofchain)));
 6489 
 6490                         /* Now lets copy it out */
 6491                         if (len >= sizeofcpy) {
 6492                                 /* It all fits, copy it in */
 6493                                 m_copydata(clonechain, 0, sizeofcpy, cp);
 6494                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6495                         } else {
 6496                                 /* fill up the end of the chain */
 6497                                 if (len > 0) {
 6498                                         m_copydata(clonechain, 0, len, cp);
 6499                                         SCTP_BUF_LEN((*endofchain)) += len;
 6500                                         /* now we need another one */
 6501                                         sizeofcpy -= len;
 6502                                 }
 6503                                 m = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_HEADER);
 6504                                 if (m == NULL) {
 6505                                         /* We failed */
 6506                                         goto error_out;
 6507                                 }
 6508                                 SCTP_BUF_NEXT((*endofchain)) = m;
 6509                                 *endofchain = m;
 6510                                 cp = mtod((*endofchain), caddr_t);
 6511                                 m_copydata(clonechain, len, sizeofcpy, cp);
 6512                                 SCTP_BUF_LEN((*endofchain)) += sizeofcpy;
 6513                         }
 6514                         return (outchain);
 6515                 } else {
 6516                         /* copy the old fashion way */
 6517                         appendchain = SCTP_M_COPYM(clonechain, 0, M_COPYALL, M_NOWAIT);
 6518 #ifdef SCTP_MBUF_LOGGING
 6519                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6520                                 sctp_log_mbc(appendchain, SCTP_MBUF_ICOPY);
 6521                         }
 6522 #endif
 6523                 }
 6524         }
 6525         if (appendchain == NULL) {
 6526                 /* error */
 6527                 if (outchain)
 6528                         sctp_m_freem(outchain);
 6529                 return (NULL);
 6530         }
 6531         if (outchain) {
 6532                 /* tack on to the end */
 6533                 if (*endofchain != NULL) {
 6534                         SCTP_BUF_NEXT(((*endofchain))) = appendchain;
 6535                 } else {
 6536                         m = outchain;
 6537                         while (m) {
 6538                                 if (SCTP_BUF_NEXT(m) == NULL) {
 6539                                         SCTP_BUF_NEXT(m) = appendchain;
 6540                                         break;
 6541                                 }
 6542                                 m = SCTP_BUF_NEXT(m);
 6543                         }
 6544                 }
 6545                 /*
 6546                  * save off the end and update the end-chain postion
 6547                  */
 6548                 m = appendchain;
 6549                 while (m) {
 6550                         if (SCTP_BUF_NEXT(m) == NULL) {
 6551                                 *endofchain = m;
 6552                                 break;
 6553                         }
 6554                         m = SCTP_BUF_NEXT(m);
 6555                 }
 6556                 return (outchain);
 6557         } else {
 6558                 /* save off the end and update the end-chain postion */
 6559                 m = appendchain;
 6560                 while (m) {
 6561                         if (SCTP_BUF_NEXT(m) == NULL) {
 6562                                 *endofchain = m;
 6563                                 break;
 6564                         }
 6565                         m = SCTP_BUF_NEXT(m);
 6566                 }
 6567                 return (appendchain);
 6568         }
 6569 }
 6570 
 6571 static int
 6572 sctp_med_chunk_output(struct sctp_inpcb *inp,
 6573     struct sctp_tcb *stcb,
 6574     struct sctp_association *asoc,
 6575     int *num_out,
 6576     int *reason_code,
 6577     int control_only, int from_where,
 6578     struct timeval *now, int *now_filled, int frag_point, int so_locked
 6579 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 6580     SCTP_UNUSED
 6581 #endif
 6582 );
 6583 
 6584 static void
 6585 sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 6586     uint32_t val SCTP_UNUSED)
 6587 {
 6588         struct sctp_copy_all *ca;
 6589         struct mbuf *m;
 6590         int ret = 0;
 6591         int added_control = 0;
 6592         int un_sent, do_chunk_output = 1;
 6593         struct sctp_association *asoc;
 6594         struct sctp_nets *net;
 6595 
 6596         ca = (struct sctp_copy_all *)ptr;
 6597         if (ca->m == NULL) {
 6598                 return;
 6599         }
 6600         if (ca->inp != inp) {
 6601                 /* TSNH */
 6602                 return;
 6603         }
 6604         if (ca->sndlen > 0) {
 6605                 m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
 6606                 if (m == NULL) {
 6607                         /* can't copy so we are done */
 6608                         ca->cnt_failed++;
 6609                         return;
 6610                 }
 6611 #ifdef SCTP_MBUF_LOGGING
 6612                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 6613                         sctp_log_mbc(m, SCTP_MBUF_ICOPY);
 6614                 }
 6615 #endif
 6616         } else {
 6617                 m = NULL;
 6618         }
 6619         SCTP_TCB_LOCK_ASSERT(stcb);
 6620         if (stcb->asoc.alternate) {
 6621                 net = stcb->asoc.alternate;
 6622         } else {
 6623                 net = stcb->asoc.primary_destination;
 6624         }
 6625         if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 6626                 /* Abort this assoc with m as the user defined reason */
 6627                 if (m != NULL) {
 6628                         SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
 6629                 } else {
 6630                         m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
 6631                             0, M_NOWAIT, 1, MT_DATA);
 6632                         SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
 6633                 }
 6634                 if (m != NULL) {
 6635                         struct sctp_paramhdr *ph;
 6636 
 6637                         ph = mtod(m, struct sctp_paramhdr *);
 6638                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
 6639                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
 6640                 }
 6641                 /*
 6642                  * We add one here to keep the assoc from dis-appearing on
 6643                  * us.
 6644                  */
 6645                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6646                 sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
 6647                 /*
 6648                  * sctp_abort_an_association calls sctp_free_asoc() free
 6649                  * association will NOT free it since we incremented the
 6650                  * refcnt .. we do this to prevent it being freed and things
 6651                  * getting tricky since we could end up (from free_asoc)
 6652                  * calling inpcb_free which would get a recursive lock call
 6653                  * to the iterator lock.. But as a consequence of that the
 6654                  * stcb will return to us un-locked.. since free_asoc
 6655                  * returns with either no TCB or the TCB unlocked, we must
 6656                  * relock.. to unlock in the iterator timer :-0
 6657                  */
 6658                 SCTP_TCB_LOCK(stcb);
 6659                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6660                 goto no_chunk_output;
 6661         } else {
 6662                 if (m) {
 6663                         ret = sctp_msg_append(stcb, net, m,
 6664                             &ca->sndrcv, 1);
 6665                 }
 6666                 asoc = &stcb->asoc;
 6667                 if (ca->sndrcv.sinfo_flags & SCTP_EOF) {
 6668                         /* shutdown this assoc */
 6669                         int cnt;
 6670 
 6671                         cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
 6672 
 6673                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6674                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6675                             (cnt == 0)) {
 6676                                 if (asoc->locked_on_sending) {
 6677                                         goto abort_anyway;
 6678                                 }
 6679                                 /*
 6680                                  * there is nothing queued to send, so I'm
 6681                                  * done...
 6682                                  */
 6683                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 6684                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6685                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6686                                         /*
 6687                                          * only send SHUTDOWN the first time
 6688                                          * through
 6689                                          */
 6690                                         if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
 6691                                                 SCTP_STAT_DECR_GAUGE32(sctps_currestab);
 6692                                         }
 6693                                         SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
 6694                                         SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
 6695                                         sctp_stop_timers_for_shutdown(stcb);
 6696                                         sctp_send_shutdown(stcb, net);
 6697                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
 6698                                             net);
 6699                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6700                                             asoc->primary_destination);
 6701                                         added_control = 1;
 6702                                         do_chunk_output = 0;
 6703                                 }
 6704                         } else {
 6705                                 /*
 6706                                  * we still got (or just got) data to send,
 6707                                  * so set SHUTDOWN_PENDING
 6708                                  */
 6709                                 /*
 6710                                  * XXX sockets draft says that SCTP_EOF
 6711                                  * should be sent with no data.  currently,
 6712                                  * we will allow user data to be sent first
 6713                                  * and move to SHUTDOWN-PENDING
 6714                                  */
 6715                                 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
 6716                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
 6717                                     (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
 6718                                         if (asoc->locked_on_sending) {
 6719                                                 /*
 6720                                                  * Locked to send out the
 6721                                                  * data
 6722                                                  */
 6723                                                 struct sctp_stream_queue_pending *sp;
 6724 
 6725                                                 sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
 6726                                                 if (sp) {
 6727                                                         if ((sp->length == 0) && (sp->msg_is_complete == 0))
 6728                                                                 asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
 6729                                                 }
 6730                                         }
 6731                                         asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
 6732                                         if (TAILQ_EMPTY(&asoc->send_queue) &&
 6733                                             TAILQ_EMPTY(&asoc->sent_queue) &&
 6734                                             (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
 6735                                                 struct mbuf *op_err;
 6736                                                 char msg[SCTP_DIAG_INFO_LEN];
 6737 
 6738                                 abort_anyway:
 6739                                                 snprintf(msg, sizeof(msg),
 6740                                                     "%s:%d at %s", __FILE__, __LINE__, __func__);
 6741                                                 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 6742                                                     msg);
 6743                                                 atomic_add_int(&stcb->asoc.refcnt, 1);
 6744                                                 sctp_abort_an_association(stcb->sctp_ep, stcb,
 6745                                                     op_err, SCTP_SO_NOT_LOCKED);
 6746                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
 6747                                                 goto no_chunk_output;
 6748                                         }
 6749                                         sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
 6750                                             asoc->primary_destination);
 6751                                 }
 6752                         }
 6753 
 6754                 }
 6755         }
 6756         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
 6757             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
 6758 
 6759         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 6760             (stcb->asoc.total_flight > 0) &&
 6761             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
 6762                 do_chunk_output = 0;
 6763         }
 6764         if (do_chunk_output)
 6765                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_NOT_LOCKED);
 6766         else if (added_control) {
 6767                 int num_out, reason, now_filled = 0;
 6768                 struct timeval now;
 6769                 int frag_point;
 6770 
 6771                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 6772                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
 6773                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_NOT_LOCKED);
 6774         }
 6775 no_chunk_output:
 6776         if (ret) {
 6777                 ca->cnt_failed++;
 6778         } else {
 6779                 ca->cnt_sent++;
 6780         }
 6781 }
 6782 
 6783 static void
 6784 sctp_sendall_completes(void *ptr, uint32_t val SCTP_UNUSED)
 6785 {
 6786         struct sctp_copy_all *ca;
 6787 
 6788         ca = (struct sctp_copy_all *)ptr;
 6789         /*
 6790          * Do a notify here? Kacheong suggests that the notify be done at
 6791          * the send time.. so you would push up a notification if any send
 6792          * failed. Don't know if this is feasable since the only failures we
 6793          * have is "memory" related and if you cannot get an mbuf to send
 6794          * the data you surely can't get an mbuf to send up to notify the
 6795          * user you can't send the data :->
 6796          */
 6797 
 6798         /* now free everything */
 6799         sctp_m_freem(ca->m);
 6800         SCTP_FREE(ca, SCTP_M_COPYAL);
 6801 }
 6802 
 6803 static struct mbuf *
 6804 sctp_copy_out_all(struct uio *uio, int len)
 6805 {
 6806         struct mbuf *ret, *at;
 6807         int left, willcpy, cancpy, error;
 6808 
 6809         ret = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_WAITOK, 1, MT_DATA);
 6810         if (ret == NULL) {
 6811                 /* TSNH */
 6812                 return (NULL);
 6813         }
 6814         left = len;
 6815         SCTP_BUF_LEN(ret) = 0;
 6816         /* save space for the data chunk header */
 6817         cancpy = M_TRAILINGSPACE(ret);
 6818         willcpy = min(cancpy, left);
 6819         at = ret;
 6820         while (left > 0) {
 6821                 /* Align data to the end */
 6822                 error = uiomove(mtod(at, caddr_t), willcpy, uio);
 6823                 if (error) {
 6824         err_out_now:
 6825                         sctp_m_freem(at);
 6826                         return (NULL);
 6827                 }
 6828                 SCTP_BUF_LEN(at) = willcpy;
 6829                 SCTP_BUF_NEXT_PKT(at) = SCTP_BUF_NEXT(at) = 0;
 6830                 left -= willcpy;
 6831                 if (left > 0) {
 6832                         SCTP_BUF_NEXT(at) = sctp_get_mbuf_for_msg(left, 0, M_WAITOK, 1, MT_DATA);
 6833                         if (SCTP_BUF_NEXT(at) == NULL) {
 6834                                 goto err_out_now;
 6835                         }
 6836                         at = SCTP_BUF_NEXT(at);
 6837                         SCTP_BUF_LEN(at) = 0;
 6838                         cancpy = M_TRAILINGSPACE(at);
 6839                         willcpy = min(cancpy, left);
 6840                 }
 6841         }
 6842         return (ret);
 6843 }
 6844 
 6845 static int
 6846 sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 6847     struct sctp_sndrcvinfo *srcv)
 6848 {
 6849         int ret;
 6850         struct sctp_copy_all *ca;
 6851 
 6852         SCTP_MALLOC(ca, struct sctp_copy_all *, sizeof(struct sctp_copy_all),
 6853             SCTP_M_COPYAL);
 6854         if (ca == NULL) {
 6855                 sctp_m_freem(m);
 6856                 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6857                 return (ENOMEM);
 6858         }
 6859         memset(ca, 0, sizeof(struct sctp_copy_all));
 6860 
 6861         ca->inp = inp;
 6862         if (srcv) {
 6863                 memcpy(&ca->sndrcv, srcv, sizeof(struct sctp_nonpad_sndrcvinfo));
 6864         }
 6865         /*
 6866          * take off the sendall flag, it would be bad if we failed to do
 6867          * this :-0
 6868          */
 6869         ca->sndrcv.sinfo_flags &= ~SCTP_SENDALL;
 6870         /* get length and mbuf chain */
 6871         if (uio) {
 6872                 ca->sndlen = uio->uio_resid;
 6873                 ca->m = sctp_copy_out_all(uio, ca->sndlen);
 6874                 if (ca->m == NULL) {
 6875                         SCTP_FREE(ca, SCTP_M_COPYAL);
 6876                         SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 6877                         return (ENOMEM);
 6878                 }
 6879         } else {
 6880                 /* Gather the length of the send */
 6881                 struct mbuf *mat;
 6882 
 6883                 ca->sndlen = 0;
 6884                 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
 6885                         ca->sndlen += SCTP_BUF_LEN(mat);
 6886                 }
 6887         }
 6888         ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 6889             SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
 6890             SCTP_ASOC_ANY_STATE,
 6891             (void *)ca, 0,
 6892             sctp_sendall_completes, inp, 1);
 6893         if (ret) {
 6894                 SCTP_PRINTF("Failed to initiate iterator for sendall\n");
 6895                 SCTP_FREE(ca, SCTP_M_COPYAL);
 6896                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
 6897                 return (EFAULT);
 6898         }
 6899         return (0);
 6900 }
 6901 
 6902 
 6903 void
 6904 sctp_toss_old_cookies(struct sctp_tcb *stcb, struct sctp_association *asoc)
 6905 {
 6906         struct sctp_tmit_chunk *chk, *nchk;
 6907 
 6908         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 6909                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 6910                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 6911                         if (chk->data) {
 6912                                 sctp_m_freem(chk->data);
 6913                                 chk->data = NULL;
 6914                         }
 6915                         asoc->ctrl_queue_cnt--;
 6916                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6917                 }
 6918         }
 6919 }
 6920 
 6921 void
 6922 sctp_toss_old_asconf(struct sctp_tcb *stcb)
 6923 {
 6924         struct sctp_association *asoc;
 6925         struct sctp_tmit_chunk *chk, *nchk;
 6926         struct sctp_asconf_chunk *acp;
 6927 
 6928         asoc = &stcb->asoc;
 6929         TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 6930                 /* find SCTP_ASCONF chunk in queue */
 6931                 if (chk->rec.chunk_id.id == SCTP_ASCONF) {
 6932                         if (chk->data) {
 6933                                 acp = mtod(chk->data, struct sctp_asconf_chunk *);
 6934                                 if (SCTP_TSN_GT(ntohl(acp->serial_number), asoc->asconf_seq_out_acked)) {
 6935                                         /* Not Acked yet */
 6936                                         break;
 6937                                 }
 6938                         }
 6939                         TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
 6940                         if (chk->data) {
 6941                                 sctp_m_freem(chk->data);
 6942                                 chk->data = NULL;
 6943                         }
 6944                         asoc->ctrl_queue_cnt--;
 6945                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
 6946                 }
 6947         }
 6948 }
 6949 
 6950 
 6951 static void
 6952 sctp_clean_up_datalist(struct sctp_tcb *stcb,
 6953     struct sctp_association *asoc,
 6954     struct sctp_tmit_chunk **data_list,
 6955     int bundle_at,
 6956     struct sctp_nets *net)
 6957 {
 6958         int i;
 6959         struct sctp_tmit_chunk *tp1;
 6960 
 6961         for (i = 0; i < bundle_at; i++) {
 6962                 /* off of the send queue */
 6963                 TAILQ_REMOVE(&asoc->send_queue, data_list[i], sctp_next);
 6964                 asoc->send_queue_cnt--;
 6965                 if (i > 0) {
 6966                         /*
 6967                          * Any chunk NOT 0 you zap the time chunk 0 gets
 6968                          * zapped or set based on if a RTO measurment is
 6969                          * needed.
 6970                          */
 6971                         data_list[i]->do_rtt = 0;
 6972                 }
 6973                 /* record time */
 6974                 data_list[i]->sent_rcv_time = net->last_sent_time;
 6975                 data_list[i]->rec.data.cwnd_at_send = net->cwnd;
 6976                 data_list[i]->rec.data.fast_retran_tsn = data_list[i]->rec.data.TSN_seq;
 6977                 if (data_list[i]->whoTo == NULL) {
 6978                         data_list[i]->whoTo = net;
 6979                         atomic_add_int(&net->ref_count, 1);
 6980                 }
 6981                 /* on to the sent queue */
 6982                 tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead);
 6983                 if ((tp1) && SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
 6984                         struct sctp_tmit_chunk *tpp;
 6985 
 6986                         /* need to move back */
 6987         back_up_more:
 6988                         tpp = TAILQ_PREV(tp1, sctpchunk_listhead, sctp_next);
 6989                         if (tpp == NULL) {
 6990                                 TAILQ_INSERT_BEFORE(tp1, data_list[i], sctp_next);
 6991                                 goto all_done;
 6992                         }
 6993                         tp1 = tpp;
 6994                         if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, data_list[i]->rec.data.TSN_seq)) {
 6995                                 goto back_up_more;
 6996                         }
 6997                         TAILQ_INSERT_AFTER(&asoc->sent_queue, tp1, data_list[i], sctp_next);
 6998                 } else {
 6999                         TAILQ_INSERT_TAIL(&asoc->sent_queue,
 7000                             data_list[i],
 7001                             sctp_next);
 7002                 }
 7003 all_done:
 7004                 /* This does not lower until the cum-ack passes it */
 7005                 asoc->sent_queue_cnt++;
 7006                 if ((asoc->peers_rwnd <= 0) &&
 7007                     (asoc->total_flight == 0) &&
 7008                     (bundle_at == 1)) {
 7009                         /* Mark the chunk as being a window probe */
 7010                         SCTP_STAT_INCR(sctps_windowprobed);
 7011                 }
 7012 #ifdef SCTP_AUDITING_ENABLED
 7013                 sctp_audit_log(0xC2, 3);
 7014 #endif
 7015                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 7016                 data_list[i]->snd_count = 1;
 7017                 data_list[i]->rec.data.chunk_was_revoked = 0;
 7018                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 7019                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
 7020                             data_list[i]->whoTo->flight_size,
 7021                             data_list[i]->book_size,
 7022                             (uintptr_t) data_list[i]->whoTo,
 7023                             data_list[i]->rec.data.TSN_seq);
 7024                 }
 7025                 sctp_flight_size_increase(data_list[i]);
 7026                 sctp_total_flight_increase(stcb, data_list[i]);
 7027                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 7028                         sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 7029                             asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 7030                 }
 7031                 asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 7032                     (uint32_t) (data_list[i]->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 7033                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 7034                         /* SWS sender side engages */
 7035                         asoc->peers_rwnd = 0;
 7036                 }
 7037         }
 7038         if (asoc->cc_functions.sctp_cwnd_update_packet_transmitted) {
 7039                 (*asoc->cc_functions.sctp_cwnd_update_packet_transmitted) (stcb, net);
 7040         }
 7041 }
 7042 
 7043 static void
 7044 sctp_clean_up_ctl(struct sctp_tcb *stcb, struct sctp_association *asoc, int so_locked
 7045 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7046     SCTP_UNUSED
 7047 #endif
 7048 )
 7049 {
 7050         struct sctp_tmit_chunk *chk, *nchk;
 7051 
 7052         TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 7053                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7054                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 7055                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 7056                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 7057                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) ||
 7058                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 7059                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 7060                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 7061                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 7062                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 7063                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 7064                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 7065                         /* Stray chunks must be cleaned up */
 7066         clean_up_anyway:
 7067                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
 7068                         if (chk->data) {
 7069                                 sctp_m_freem(chk->data);
 7070                                 chk->data = NULL;
 7071                         }
 7072                         asoc->ctrl_queue_cnt--;
 7073                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)
 7074                                 asoc->fwd_tsn_cnt--;
 7075                         sctp_free_a_chunk(stcb, chk, so_locked);
 7076                 } else if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 7077                         /* special handling, we must look into the param */
 7078                         if (chk != asoc->str_reset) {
 7079                                 goto clean_up_anyway;
 7080                         }
 7081                 }
 7082         }
 7083 }
 7084 
 7085 
 7086 static int
 7087 sctp_can_we_split_this(struct sctp_tcb *stcb,
 7088     uint32_t length,
 7089     uint32_t goal_mtu, uint32_t frag_point, int eeor_on)
 7090 {
 7091         /*
 7092          * Make a decision on if I should split a msg into multiple parts.
 7093          * This is only asked of incomplete messages.
 7094          */
 7095         if (eeor_on) {
 7096                 /*
 7097                  * If we are doing EEOR we need to always send it if its the
 7098                  * entire thing, since it might be all the guy is putting in
 7099                  * the hopper.
 7100                  */
 7101                 if (goal_mtu >= length) {
 7102                         /*-
 7103                          * If we have data outstanding,
 7104                          * we get another chance when the sack
 7105                          * arrives to transmit - wait for more data
 7106                          */
 7107                         if (stcb->asoc.total_flight == 0) {
 7108                                 /*
 7109                                  * If nothing is in flight, we zero the
 7110                                  * packet counter.
 7111                                  */
 7112                                 return (length);
 7113                         }
 7114                         return (0);
 7115 
 7116                 } else {
 7117                         /* You can fill the rest */
 7118                         return (goal_mtu);
 7119                 }
 7120         }
 7121         /*-
 7122          * For those strange folk that make the send buffer
 7123          * smaller than our fragmentation point, we can't
 7124          * get a full msg in so we have to allow splitting.
 7125          */
 7126         if (SCTP_SB_LIMIT_SND(stcb->sctp_socket) < frag_point) {
 7127                 return (length);
 7128         }
 7129         if ((length <= goal_mtu) ||
 7130             ((length - goal_mtu) < SCTP_BASE_SYSCTL(sctp_min_residual))) {
 7131                 /* Sub-optimial residual don't split in non-eeor mode. */
 7132                 return (0);
 7133         }
 7134         /*
 7135          * If we reach here length is larger than the goal_mtu. Do we wish
 7136          * to split it for the sake of packet putting together?
 7137          */
 7138         if (goal_mtu >= min(SCTP_BASE_SYSCTL(sctp_min_split_point), frag_point)) {
 7139                 /* Its ok to split it */
 7140                 return (min(goal_mtu, frag_point));
 7141         }
 7142         /* Nope, can't split */
 7143         return (0);
 7144 
 7145 }
 7146 
 7147 static uint32_t
 7148 sctp_move_to_outqueue(struct sctp_tcb *stcb,
 7149     struct sctp_stream_out *strq,
 7150     uint32_t goal_mtu,
 7151     uint32_t frag_point,
 7152     int *locked,
 7153     int *giveup,
 7154     int eeor_mode,
 7155     int *bail,
 7156     int so_locked
 7157 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7158     SCTP_UNUSED
 7159 #endif
 7160 )
 7161 {
 7162         /* Move from the stream to the send_queue keeping track of the total */
 7163         struct sctp_association *asoc;
 7164         struct sctp_stream_queue_pending *sp;
 7165         struct sctp_tmit_chunk *chk;
 7166         struct sctp_data_chunk *dchkh;
 7167         uint32_t to_move, length;
 7168         uint8_t rcv_flags = 0;
 7169         uint8_t some_taken;
 7170         uint8_t send_lock_up = 0;
 7171 
 7172         SCTP_TCB_LOCK_ASSERT(stcb);
 7173         asoc = &stcb->asoc;
 7174 one_more_time:
 7175         /* sa_ignore FREED_MEMORY */
 7176         sp = TAILQ_FIRST(&strq->outqueue);
 7177         if (sp == NULL) {
 7178                 *locked = 0;
 7179                 if (send_lock_up == 0) {
 7180                         SCTP_TCB_SEND_LOCK(stcb);
 7181                         send_lock_up = 1;
 7182                 }
 7183                 sp = TAILQ_FIRST(&strq->outqueue);
 7184                 if (sp) {
 7185                         goto one_more_time;
 7186                 }
 7187                 if (strq->last_msg_incomplete) {
 7188                         SCTP_PRINTF("Huh? Stream:%d lm_in_c=%d but queue is NULL\n",
 7189                             strq->stream_no,
 7190                             strq->last_msg_incomplete);
 7191                         strq->last_msg_incomplete = 0;
 7192                 }
 7193                 to_move = 0;
 7194                 if (send_lock_up) {
 7195                         SCTP_TCB_SEND_UNLOCK(stcb);
 7196                         send_lock_up = 0;
 7197                 }
 7198                 goto out_of;
 7199         }
 7200         if ((sp->msg_is_complete) && (sp->length == 0)) {
 7201                 if (sp->sender_all_done) {
 7202                         /*
 7203                          * We are doing differed cleanup. Last time through
 7204                          * when we took all the data the sender_all_done was
 7205                          * not set.
 7206                          */
 7207                         if ((sp->put_last_out == 0) && (sp->discard_rest == 0)) {
 7208                                 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
 7209                                 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7210                                     sp->sender_all_done,
 7211                                     sp->length,
 7212                                     sp->msg_is_complete,
 7213                                     sp->put_last_out,
 7214                                     send_lock_up);
 7215                         }
 7216                         if ((TAILQ_NEXT(sp, next) == NULL) && (send_lock_up == 0)) {
 7217                                 SCTP_TCB_SEND_LOCK(stcb);
 7218                                 send_lock_up = 1;
 7219                         }
 7220                         atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7221                         TAILQ_REMOVE(&strq->outqueue, sp, next);
 7222                         if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7223                             (strq->chunks_on_queues == 0) &&
 7224                             TAILQ_EMPTY(&strq->outqueue)) {
 7225                                 stcb->asoc.trigger_reset = 1;
 7226                         }
 7227                         stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7228                         if (sp->net) {
 7229                                 sctp_free_remote_addr(sp->net);
 7230                                 sp->net = NULL;
 7231                         }
 7232                         if (sp->data) {
 7233                                 sctp_m_freem(sp->data);
 7234                                 sp->data = NULL;
 7235                         }
 7236                         sctp_free_a_strmoq(stcb, sp, so_locked);
 7237                         /* we can't be locked to it */
 7238                         *locked = 0;
 7239                         stcb->asoc.locked_on_sending = NULL;
 7240                         if (send_lock_up) {
 7241                                 SCTP_TCB_SEND_UNLOCK(stcb);
 7242                                 send_lock_up = 0;
 7243                         }
 7244                         /* back to get the next msg */
 7245                         goto one_more_time;
 7246                 } else {
 7247                         /*
 7248                          * sender just finished this but still holds a
 7249                          * reference
 7250                          */
 7251                         *locked = 1;
 7252                         *giveup = 1;
 7253                         to_move = 0;
 7254                         goto out_of;
 7255                 }
 7256         } else {
 7257                 /* is there some to get */
 7258                 if (sp->length == 0) {
 7259                         /* no */
 7260                         *locked = 1;
 7261                         *giveup = 1;
 7262                         to_move = 0;
 7263                         goto out_of;
 7264                 } else if (sp->discard_rest) {
 7265                         if (send_lock_up == 0) {
 7266                                 SCTP_TCB_SEND_LOCK(stcb);
 7267                                 send_lock_up = 1;
 7268                         }
 7269                         /* Whack down the size */
 7270                         atomic_subtract_int(&stcb->asoc.total_output_queue_size, sp->length);
 7271                         if ((stcb->sctp_socket != NULL) &&
 7272                             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
 7273                             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) {
 7274                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc, sp->length);
 7275                         }
 7276                         if (sp->data) {
 7277                                 sctp_m_freem(sp->data);
 7278                                 sp->data = NULL;
 7279                                 sp->tail_mbuf = NULL;
 7280                         }
 7281                         sp->length = 0;
 7282                         sp->some_taken = 1;
 7283                         *locked = 1;
 7284                         *giveup = 1;
 7285                         to_move = 0;
 7286                         goto out_of;
 7287                 }
 7288         }
 7289         some_taken = sp->some_taken;
 7290 re_look:
 7291         length = sp->length;
 7292         if (sp->msg_is_complete) {
 7293                 /* The message is complete */
 7294                 to_move = min(length, frag_point);
 7295                 if (to_move == length) {
 7296                         /* All of it fits in the MTU */
 7297                         if (sp->some_taken) {
 7298                                 rcv_flags |= SCTP_DATA_LAST_FRAG;
 7299                                 sp->put_last_out = 1;
 7300                         } else {
 7301                                 rcv_flags |= SCTP_DATA_NOT_FRAG;
 7302                                 sp->put_last_out = 1;
 7303                         }
 7304                 } else {
 7305                         /* Not all of it fits, we fragment */
 7306                         if (sp->some_taken == 0) {
 7307                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7308                         }
 7309                         sp->some_taken = 1;
 7310                 }
 7311         } else {
 7312                 to_move = sctp_can_we_split_this(stcb, length, goal_mtu, frag_point, eeor_mode);
 7313                 if (to_move) {
 7314                         /*-
 7315                          * We use a snapshot of length in case it
 7316                          * is expanding during the compare.
 7317                          */
 7318                         uint32_t llen;
 7319 
 7320                         llen = length;
 7321                         if (to_move >= llen) {
 7322                                 to_move = llen;
 7323                                 if (send_lock_up == 0) {
 7324                                         /*-
 7325                                          * We are taking all of an incomplete msg
 7326                                          * thus we need a send lock.
 7327                                          */
 7328                                         SCTP_TCB_SEND_LOCK(stcb);
 7329                                         send_lock_up = 1;
 7330                                         if (sp->msg_is_complete) {
 7331                                                 /*
 7332                                                  * the sender finished the
 7333                                                  * msg
 7334                                                  */
 7335                                                 goto re_look;
 7336                                         }
 7337                                 }
 7338                         }
 7339                         if (sp->some_taken == 0) {
 7340                                 rcv_flags |= SCTP_DATA_FIRST_FRAG;
 7341                                 sp->some_taken = 1;
 7342                         }
 7343                 } else {
 7344                         /* Nothing to take. */
 7345                         if (sp->some_taken) {
 7346                                 *locked = 1;
 7347                         }
 7348                         *giveup = 1;
 7349                         to_move = 0;
 7350                         goto out_of;
 7351                 }
 7352         }
 7353 
 7354         /* If we reach here, we can copy out a chunk */
 7355         sctp_alloc_a_chunk(stcb, chk);
 7356         if (chk == NULL) {
 7357                 /* No chunk memory */
 7358                 *giveup = 1;
 7359                 to_move = 0;
 7360                 goto out_of;
 7361         }
 7362         /*
 7363          * Setup for unordered if needed by looking at the user sent info
 7364          * flags.
 7365          */
 7366         if (sp->sinfo_flags & SCTP_UNORDERED) {
 7367                 rcv_flags |= SCTP_DATA_UNORDERED;
 7368         }
 7369         if ((SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) && ((sp->sinfo_flags & SCTP_EOF) == SCTP_EOF)) ||
 7370             ((sp->sinfo_flags & SCTP_SACK_IMMEDIATELY) == SCTP_SACK_IMMEDIATELY)) {
 7371                 rcv_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 7372         }
 7373         /* clear out the chunk before setting up */
 7374         memset(chk, 0, sizeof(*chk));
 7375         chk->rec.data.rcv_flags = rcv_flags;
 7376 
 7377         if (to_move >= length) {
 7378                 /* we think we can steal the whole thing */
 7379                 if ((sp->sender_all_done == 0) && (send_lock_up == 0)) {
 7380                         SCTP_TCB_SEND_LOCK(stcb);
 7381                         send_lock_up = 1;
 7382                 }
 7383                 if (to_move < sp->length) {
 7384                         /* bail, it changed */
 7385                         goto dont_do_it;
 7386                 }
 7387                 chk->data = sp->data;
 7388                 chk->last_mbuf = sp->tail_mbuf;
 7389                 /* register the stealing */
 7390                 sp->data = sp->tail_mbuf = NULL;
 7391         } else {
 7392                 struct mbuf *m;
 7393 
 7394 dont_do_it:
 7395                 chk->data = SCTP_M_COPYM(sp->data, 0, to_move, M_NOWAIT);
 7396                 chk->last_mbuf = NULL;
 7397                 if (chk->data == NULL) {
 7398                         sp->some_taken = some_taken;
 7399                         sctp_free_a_chunk(stcb, chk, so_locked);
 7400                         *bail = 1;
 7401                         to_move = 0;
 7402                         goto out_of;
 7403                 }
 7404 #ifdef SCTP_MBUF_LOGGING
 7405                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 7406                         sctp_log_mbc(chk->data, SCTP_MBUF_ICOPY);
 7407                 }
 7408 #endif
 7409                 /* Pull off the data */
 7410                 m_adj(sp->data, to_move);
 7411                 /* Now lets work our way down and compact it */
 7412                 m = sp->data;
 7413                 while (m && (SCTP_BUF_LEN(m) == 0)) {
 7414                         sp->data = SCTP_BUF_NEXT(m);
 7415                         SCTP_BUF_NEXT(m) = NULL;
 7416                         if (sp->tail_mbuf == m) {
 7417                                 /*-
 7418                                  * Freeing tail? TSNH since
 7419                                  * we supposedly were taking less
 7420                                  * than the sp->length.
 7421                                  */
 7422 #ifdef INVARIANTS
 7423                                 panic("Huh, freing tail? - TSNH");
 7424 #else
 7425                                 SCTP_PRINTF("Huh, freeing tail? - TSNH\n");
 7426                                 sp->tail_mbuf = sp->data = NULL;
 7427                                 sp->length = 0;
 7428 #endif
 7429 
 7430                         }
 7431                         sctp_m_free(m);
 7432                         m = sp->data;
 7433                 }
 7434         }
 7435         if (SCTP_BUF_IS_EXTENDED(chk->data)) {
 7436                 chk->copy_by_ref = 1;
 7437         } else {
 7438                 chk->copy_by_ref = 0;
 7439         }
 7440         /*
 7441          * get last_mbuf and counts of mb useage This is ugly but hopefully
 7442          * its only one mbuf.
 7443          */
 7444         if (chk->last_mbuf == NULL) {
 7445                 chk->last_mbuf = chk->data;
 7446                 while (SCTP_BUF_NEXT(chk->last_mbuf) != NULL) {
 7447                         chk->last_mbuf = SCTP_BUF_NEXT(chk->last_mbuf);
 7448                 }
 7449         }
 7450         if (to_move > length) {
 7451                 /*- This should not happen either
 7452                  * since we always lower to_move to the size
 7453                  * of sp->length if its larger.
 7454                  */
 7455 #ifdef INVARIANTS
 7456                 panic("Huh, how can to_move be larger?");
 7457 #else
 7458                 SCTP_PRINTF("Huh, how can to_move be larger?\n");
 7459                 sp->length = 0;
 7460 #endif
 7461         } else {
 7462                 atomic_subtract_int(&sp->length, to_move);
 7463         }
 7464         if (M_LEADINGSPACE(chk->data) < (int)sizeof(struct sctp_data_chunk)) {
 7465                 /* Not enough room for a chunk header, get some */
 7466                 struct mbuf *m;
 7467 
 7468                 m = sctp_get_mbuf_for_msg(1, 0, M_NOWAIT, 0, MT_DATA);
 7469                 if (m == NULL) {
 7470                         /*
 7471                          * we're in trouble here. _PREPEND below will free
 7472                          * all the data if there is no leading space, so we
 7473                          * must put the data back and restore.
 7474                          */
 7475                         if (send_lock_up == 0) {
 7476                                 SCTP_TCB_SEND_LOCK(stcb);
 7477                                 send_lock_up = 1;
 7478                         }
 7479                         if (sp->data == NULL) {
 7480                                 /* unsteal the data */
 7481                                 sp->data = chk->data;
 7482                                 sp->tail_mbuf = chk->last_mbuf;
 7483                         } else {
 7484                                 struct mbuf *m_tmp;
 7485 
 7486                                 /* reassemble the data */
 7487                                 m_tmp = sp->data;
 7488                                 sp->data = chk->data;
 7489                                 SCTP_BUF_NEXT(chk->last_mbuf) = m_tmp;
 7490                         }
 7491                         sp->some_taken = some_taken;
 7492                         atomic_add_int(&sp->length, to_move);
 7493                         chk->data = NULL;
 7494                         *bail = 1;
 7495                         sctp_free_a_chunk(stcb, chk, so_locked);
 7496                         to_move = 0;
 7497                         goto out_of;
 7498                 } else {
 7499                         SCTP_BUF_LEN(m) = 0;
 7500                         SCTP_BUF_NEXT(m) = chk->data;
 7501                         chk->data = m;
 7502                         M_ALIGN(chk->data, 4);
 7503                 }
 7504         }
 7505         SCTP_BUF_PREPEND(chk->data, sizeof(struct sctp_data_chunk), M_NOWAIT);
 7506         if (chk->data == NULL) {
 7507                 /* HELP, TSNH since we assured it would not above? */
 7508 #ifdef INVARIANTS
 7509                 panic("prepend failes HELP?");
 7510 #else
 7511                 SCTP_PRINTF("prepend fails HELP?\n");
 7512                 sctp_free_a_chunk(stcb, chk, so_locked);
 7513 #endif
 7514                 *bail = 1;
 7515                 to_move = 0;
 7516                 goto out_of;
 7517         }
 7518         sctp_snd_sb_alloc(stcb, sizeof(struct sctp_data_chunk));
 7519         chk->book_size = chk->send_size = (to_move + sizeof(struct sctp_data_chunk));
 7520         chk->book_size_scale = 0;
 7521         chk->sent = SCTP_DATAGRAM_UNSENT;
 7522 
 7523         chk->flags = 0;
 7524         chk->asoc = &stcb->asoc;
 7525         chk->pad_inplace = 0;
 7526         chk->no_fr_allowed = 0;
 7527         chk->rec.data.stream_seq = strq->next_sequence_send;
 7528         if ((rcv_flags & SCTP_DATA_LAST_FRAG) &&
 7529             !(rcv_flags & SCTP_DATA_UNORDERED)) {
 7530                 strq->next_sequence_send++;
 7531         }
 7532         chk->rec.data.stream_number = sp->stream;
 7533         chk->rec.data.payloadtype = sp->ppid;
 7534         chk->rec.data.context = sp->context;
 7535         chk->rec.data.doing_fast_retransmit = 0;
 7536 
 7537         chk->rec.data.timetodrop = sp->ts;
 7538         chk->flags = sp->act_flags;
 7539 
 7540         if (sp->net) {
 7541                 chk->whoTo = sp->net;
 7542                 atomic_add_int(&chk->whoTo->ref_count, 1);
 7543         } else
 7544                 chk->whoTo = NULL;
 7545 
 7546         if (sp->holds_key_ref) {
 7547                 chk->auth_keyid = sp->auth_keyid;
 7548                 sctp_auth_key_acquire(stcb, chk->auth_keyid);
 7549                 chk->holds_key_ref = 1;
 7550         }
 7551         chk->rec.data.TSN_seq = atomic_fetchadd_int(&asoc->sending_seq, 1);
 7552         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_AT_SEND_2_OUTQ) {
 7553                 sctp_misc_ints(SCTP_STRMOUT_LOG_SEND,
 7554                     (uintptr_t) stcb, sp->length,
 7555                     (uint32_t) ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq),
 7556                     chk->rec.data.TSN_seq);
 7557         }
 7558         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 7559         /*
 7560          * Put the rest of the things in place now. Size was done earlier in
 7561          * previous loop prior to padding.
 7562          */
 7563 
 7564 #ifdef SCTP_ASOCLOG_OF_TSNS
 7565         SCTP_TCB_LOCK_ASSERT(stcb);
 7566         if (asoc->tsn_out_at >= SCTP_TSN_LOG_SIZE) {
 7567                 asoc->tsn_out_at = 0;
 7568                 asoc->tsn_out_wrapped = 1;
 7569         }
 7570         asoc->out_tsnlog[asoc->tsn_out_at].tsn = chk->rec.data.TSN_seq;
 7571         asoc->out_tsnlog[asoc->tsn_out_at].strm = chk->rec.data.stream_number;
 7572         asoc->out_tsnlog[asoc->tsn_out_at].seq = chk->rec.data.stream_seq;
 7573         asoc->out_tsnlog[asoc->tsn_out_at].sz = chk->send_size;
 7574         asoc->out_tsnlog[asoc->tsn_out_at].flgs = chk->rec.data.rcv_flags;
 7575         asoc->out_tsnlog[asoc->tsn_out_at].stcb = (void *)stcb;
 7576         asoc->out_tsnlog[asoc->tsn_out_at].in_pos = asoc->tsn_out_at;
 7577         asoc->out_tsnlog[asoc->tsn_out_at].in_out = 2;
 7578         asoc->tsn_out_at++;
 7579 #endif
 7580 
 7581         dchkh->ch.chunk_type = SCTP_DATA;
 7582         dchkh->ch.chunk_flags = chk->rec.data.rcv_flags;
 7583         dchkh->dp.tsn = htonl(chk->rec.data.TSN_seq);
 7584         dchkh->dp.stream_id = htons(strq->stream_no);
 7585         dchkh->dp.stream_sequence = htons(chk->rec.data.stream_seq);
 7586         dchkh->dp.protocol_id = chk->rec.data.payloadtype;
 7587         dchkh->ch.chunk_length = htons(chk->send_size);
 7588         /* Now advance the chk->send_size by the actual pad needed. */
 7589         if (chk->send_size < SCTP_SIZE32(chk->book_size)) {
 7590                 /* need a pad */
 7591                 struct mbuf *lm;
 7592                 int pads;
 7593 
 7594                 pads = SCTP_SIZE32(chk->book_size) - chk->send_size;
 7595                 lm = sctp_pad_lastmbuf(chk->data, pads, chk->last_mbuf);
 7596                 if (lm != NULL) {
 7597                         chk->last_mbuf = lm;
 7598                         chk->pad_inplace = 1;
 7599                 }
 7600                 chk->send_size += pads;
 7601         }
 7602         if (PR_SCTP_ENABLED(chk->flags)) {
 7603                 asoc->pr_sctp_cnt++;
 7604         }
 7605         if (sp->msg_is_complete && (sp->length == 0) && (sp->sender_all_done)) {
 7606                 /* All done pull and kill the message */
 7607                 atomic_subtract_int(&asoc->stream_queue_cnt, 1);
 7608                 if (sp->put_last_out == 0) {
 7609                         SCTP_PRINTF("Gak, put out entire msg with NO end!-2\n");
 7610                         SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d send_lock:%d\n",
 7611                             sp->sender_all_done,
 7612                             sp->length,
 7613                             sp->msg_is_complete,
 7614                             sp->put_last_out,
 7615                             send_lock_up);
 7616                 }
 7617                 if ((send_lock_up == 0) && (TAILQ_NEXT(sp, next) == NULL)) {
 7618                         SCTP_TCB_SEND_LOCK(stcb);
 7619                         send_lock_up = 1;
 7620                 }
 7621                 TAILQ_REMOVE(&strq->outqueue, sp, next);
 7622                 if ((strq->state == SCTP_STREAM_RESET_PENDING) &&
 7623                     (strq->chunks_on_queues == 0) &&
 7624                     TAILQ_EMPTY(&strq->outqueue)) {
 7625                         stcb->asoc.trigger_reset = 1;
 7626                 }
 7627                 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, strq, sp, send_lock_up);
 7628                 if (sp->net) {
 7629                         sctp_free_remote_addr(sp->net);
 7630                         sp->net = NULL;
 7631                 }
 7632                 if (sp->data) {
 7633                         sctp_m_freem(sp->data);
 7634                         sp->data = NULL;
 7635                 }
 7636                 sctp_free_a_strmoq(stcb, sp, so_locked);
 7637 
 7638                 /* we can't be locked to it */
 7639                 *locked = 0;
 7640                 stcb->asoc.locked_on_sending = NULL;
 7641         } else {
 7642                 /* more to go, we are locked */
 7643                 *locked = 1;
 7644         }
 7645         asoc->chunks_on_out_queue++;
 7646         strq->chunks_on_queues++;
 7647         TAILQ_INSERT_TAIL(&asoc->send_queue, chk, sctp_next);
 7648         asoc->send_queue_cnt++;
 7649 out_of:
 7650         if (send_lock_up) {
 7651                 SCTP_TCB_SEND_UNLOCK(stcb);
 7652         }
 7653         return (to_move);
 7654 }
 7655 
 7656 
 7657 static void
 7658 sctp_fill_outqueue(struct sctp_tcb *stcb,
 7659     struct sctp_nets *net, int frag_point, int eeor_mode, int *quit_now, int so_locked
 7660 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7661     SCTP_UNUSED
 7662 #endif
 7663 )
 7664 {
 7665         struct sctp_association *asoc;
 7666         struct sctp_stream_out *strq;
 7667         int goal_mtu, moved_how_much, total_moved = 0, bail = 0;
 7668         int locked, giveup;
 7669 
 7670         SCTP_TCB_LOCK_ASSERT(stcb);
 7671         asoc = &stcb->asoc;
 7672         switch (net->ro._l_addr.sa.sa_family) {
 7673 #ifdef INET
 7674         case AF_INET:
 7675                 goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 7676                 break;
 7677 #endif
 7678 #ifdef INET6
 7679         case AF_INET6:
 7680                 goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
 7681                 break;
 7682 #endif
 7683         default:
 7684                 /* TSNH */
 7685                 goal_mtu = net->mtu;
 7686                 break;
 7687         }
 7688         /* Need an allowance for the data chunk header too */
 7689         goal_mtu -= sizeof(struct sctp_data_chunk);
 7690 
 7691         /* must make even word boundary */
 7692         goal_mtu &= 0xfffffffc;
 7693         if (asoc->locked_on_sending) {
 7694                 /* We are stuck on one stream until the message completes. */
 7695                 strq = asoc->locked_on_sending;
 7696                 locked = 1;
 7697         } else {
 7698                 strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7699                 locked = 0;
 7700         }
 7701         while ((goal_mtu > 0) && strq) {
 7702                 giveup = 0;
 7703                 bail = 0;
 7704                 moved_how_much = sctp_move_to_outqueue(stcb, strq, goal_mtu, frag_point, &locked,
 7705                     &giveup, eeor_mode, &bail, so_locked);
 7706                 if (moved_how_much)
 7707                         stcb->asoc.ss_functions.sctp_ss_scheduled(stcb, net, asoc, strq, moved_how_much);
 7708 
 7709                 if (locked) {
 7710                         asoc->locked_on_sending = strq;
 7711                         if ((moved_how_much == 0) || (giveup) || bail)
 7712                                 /* no more to move for now */
 7713                                 break;
 7714                 } else {
 7715                         asoc->locked_on_sending = NULL;
 7716                         if ((giveup) || bail) {
 7717                                 break;
 7718                         }
 7719                         strq = stcb->asoc.ss_functions.sctp_ss_select_stream(stcb, net, asoc);
 7720                         if (strq == NULL) {
 7721                                 break;
 7722                         }
 7723                 }
 7724                 total_moved += moved_how_much;
 7725                 goal_mtu -= (moved_how_much + sizeof(struct sctp_data_chunk));
 7726                 goal_mtu &= 0xfffffffc;
 7727         }
 7728         if (bail)
 7729                 *quit_now = 1;
 7730 
 7731         stcb->asoc.ss_functions.sctp_ss_packet_done(stcb, net, asoc);
 7732 
 7733         if (total_moved == 0) {
 7734                 if ((stcb->asoc.sctp_cmt_on_off == 0) &&
 7735                     (net == stcb->asoc.primary_destination)) {
 7736                         /* ran dry for primary network net */
 7737                         SCTP_STAT_INCR(sctps_primary_randry);
 7738                 } else if (stcb->asoc.sctp_cmt_on_off > 0) {
 7739                         /* ran dry with CMT on */
 7740                         SCTP_STAT_INCR(sctps_cmt_randry);
 7741                 }
 7742         }
 7743 }
 7744 
 7745 void
 7746 sctp_fix_ecn_echo(struct sctp_association *asoc)
 7747 {
 7748         struct sctp_tmit_chunk *chk;
 7749 
 7750         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7751                 if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 7752                         chk->sent = SCTP_DATAGRAM_UNSENT;
 7753                 }
 7754         }
 7755 }
 7756 
 7757 void
 7758 sctp_move_chunks_from_net(struct sctp_tcb *stcb, struct sctp_nets *net)
 7759 {
 7760         struct sctp_association *asoc;
 7761         struct sctp_tmit_chunk *chk;
 7762         struct sctp_stream_queue_pending *sp;
 7763         unsigned int i;
 7764 
 7765         if (net == NULL) {
 7766                 return;
 7767         }
 7768         asoc = &stcb->asoc;
 7769         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
 7770                 TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
 7771                         if (sp->net == net) {
 7772                                 sctp_free_remote_addr(sp->net);
 7773                                 sp->net = NULL;
 7774                         }
 7775                 }
 7776         }
 7777         TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7778                 if (chk->whoTo == net) {
 7779                         sctp_free_remote_addr(chk->whoTo);
 7780                         chk->whoTo = NULL;
 7781                 }
 7782         }
 7783 }
 7784 
 7785 int
 7786 sctp_med_chunk_output(struct sctp_inpcb *inp,
 7787     struct sctp_tcb *stcb,
 7788     struct sctp_association *asoc,
 7789     int *num_out,
 7790     int *reason_code,
 7791     int control_only, int from_where,
 7792     struct timeval *now, int *now_filled, int frag_point, int so_locked
 7793 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 7794     SCTP_UNUSED
 7795 #endif
 7796 )
 7797 {
 7798         /**
 7799          * Ok this is the generic chunk service queue. we must do the
 7800          * following: - Service the stream queue that is next, moving any
 7801          * message (note I must get a complete message i.e. FIRST/MIDDLE and
 7802          * LAST to the out queue in one pass) and assigning TSN's - Check to
 7803          * see if the cwnd/rwnd allows any output, if so we go ahead and
 7804          * fomulate and send the low level chunks. Making sure to combine
 7805          * any control in the control chunk queue also.
 7806          */
 7807         struct sctp_nets *net, *start_at, *sack_goes_to = NULL, *old_start_at = NULL;
 7808         struct mbuf *outchain, *endoutchain;
 7809         struct sctp_tmit_chunk *chk, *nchk;
 7810 
 7811         /* temp arrays for unlinking */
 7812         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 7813         int no_fragmentflg, error;
 7814         unsigned int max_rwnd_per_dest, max_send_per_dest;
 7815         int one_chunk, hbflag, skip_data_for_this_net;
 7816         int asconf, cookie, no_out_cnt;
 7817         int bundle_at, ctl_cnt, no_data_chunks, eeor_mode;
 7818         unsigned int mtu, r_mtu, omtu, mx_mtu, to_out;
 7819         int tsns_sent = 0;
 7820         uint32_t auth_offset = 0;
 7821         struct sctp_auth_chunk *auth = NULL;
 7822         uint16_t auth_keyid;
 7823         int override_ok = 1;
 7824         int skip_fill_up = 0;
 7825         int data_auth_reqd = 0;
 7826 
 7827         /*
 7828          * JRS 5/14/07 - Add flag for whether a heartbeat is sent to the
 7829          * destination.
 7830          */
 7831         int quit_now = 0;
 7832 
 7833         *num_out = 0;
 7834         *reason_code = 0;
 7835         auth_keyid = stcb->asoc.authinfo.active_keyid;
 7836         if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
 7837             (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED) ||
 7838             (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
 7839                 eeor_mode = 1;
 7840         } else {
 7841                 eeor_mode = 0;
 7842         }
 7843         ctl_cnt = no_out_cnt = asconf = cookie = 0;
 7844         /*
 7845          * First lets prime the pump. For each destination, if there is room
 7846          * in the flight size, attempt to pull an MTU's worth out of the
 7847          * stream queues into the general send_queue
 7848          */
 7849 #ifdef SCTP_AUDITING_ENABLED
 7850         sctp_audit_log(0xC2, 2);
 7851 #endif
 7852         SCTP_TCB_LOCK_ASSERT(stcb);
 7853         hbflag = 0;
 7854         if (control_only)
 7855                 no_data_chunks = 1;
 7856         else
 7857                 no_data_chunks = 0;
 7858 
 7859         /* Nothing to possible to send? */
 7860         if ((TAILQ_EMPTY(&asoc->control_send_queue) ||
 7861             (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) &&
 7862             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7863             TAILQ_EMPTY(&asoc->send_queue) &&
 7864             stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
 7865 nothing_to_send:
 7866                 *reason_code = 9;
 7867                 return (0);
 7868         }
 7869         if (asoc->peers_rwnd == 0) {
 7870                 /* No room in peers rwnd */
 7871                 *reason_code = 1;
 7872                 if (asoc->total_flight > 0) {
 7873                         /* we are allowed one chunk in flight */
 7874                         no_data_chunks = 1;
 7875                 }
 7876         }
 7877         if (stcb->asoc.ecn_echo_cnt_onq) {
 7878                 /* Record where a sack goes, if any */
 7879                 if (no_data_chunks &&
 7880                     (asoc->ctrl_queue_cnt == stcb->asoc.ecn_echo_cnt_onq)) {
 7881                         /* Nothing but ECNe to send - we don't do that */
 7882                         goto nothing_to_send;
 7883                 }
 7884                 TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7885                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 7886                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 7887                                 sack_goes_to = chk->whoTo;
 7888                                 break;
 7889                         }
 7890                 }
 7891         }
 7892         max_rwnd_per_dest = ((asoc->peers_rwnd + asoc->total_flight) / asoc->numnets);
 7893         if (stcb->sctp_socket)
 7894                 max_send_per_dest = SCTP_SB_LIMIT_SND(stcb->sctp_socket) / asoc->numnets;
 7895         else
 7896                 max_send_per_dest = 0;
 7897         if (no_data_chunks == 0) {
 7898                 /* How many non-directed chunks are there? */
 7899                 TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
 7900                         if (chk->whoTo == NULL) {
 7901                                 /*
 7902                                  * We already have non-directed chunks on
 7903                                  * the queue, no need to do a fill-up.
 7904                                  */
 7905                                 skip_fill_up = 1;
 7906                                 break;
 7907                         }
 7908                 }
 7909 
 7910         }
 7911         if ((no_data_chunks == 0) &&
 7912             (skip_fill_up == 0) &&
 7913             (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc))) {
 7914                 TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 7915                         /*
 7916                          * This for loop we are in takes in each net, if
 7917                          * its's got space in cwnd and has data sent to it
 7918                          * (when CMT is off) then it calls
 7919                          * sctp_fill_outqueue for the net. This gets data on
 7920                          * the send queue for that network.
 7921                          * 
 7922                          * In sctp_fill_outqueue TSN's are assigned and data is
 7923                          * copied out of the stream buffers. Note mostly
 7924                          * copy by reference (we hope).
 7925                          */
 7926                         net->window_probe = 0;
 7927                         if ((net != stcb->asoc.alternate) &&
 7928                             ((net->dest_state & SCTP_ADDR_PF) ||
 7929                             (!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
 7930                             (net->dest_state & SCTP_ADDR_UNCONFIRMED))) {
 7931                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7932                                         sctp_log_cwnd(stcb, net, 1,
 7933                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7934                                 }
 7935                                 continue;
 7936                         }
 7937                         if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
 7938                             (net->flight_size == 0)) {
 7939                                 (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) (stcb, net);
 7940                         }
 7941                         if (net->flight_size >= net->cwnd) {
 7942                                 /* skip this network, no room - can't fill */
 7943                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7944                                         sctp_log_cwnd(stcb, net, 3,
 7945                                             SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7946                                 }
 7947                                 continue;
 7948                         }
 7949                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 7950                                 sctp_log_cwnd(stcb, net, 4, SCTP_CWND_LOG_FILL_OUTQ_CALLED);
 7951                         }
 7952                         sctp_fill_outqueue(stcb, net, frag_point, eeor_mode, &quit_now, so_locked);
 7953                         if (quit_now) {
 7954                                 /* memory alloc failure */
 7955                                 no_data_chunks = 1;
 7956                                 break;
 7957                         }
 7958                 }
 7959         }
 7960         /* now service each destination and send out what we can for it */
 7961         /* Nothing to send? */
 7962         if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 7963             TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 7964             TAILQ_EMPTY(&asoc->send_queue)) {
 7965                 *reason_code = 8;
 7966                 return (0);
 7967         }
 7968         if (asoc->sctp_cmt_on_off > 0) {
 7969                 /* get the last start point */
 7970                 start_at = asoc->last_net_cmt_send_started;
 7971                 if (start_at == NULL) {
 7972                         /* null so to beginning */
 7973                         start_at = TAILQ_FIRST(&asoc->nets);
 7974                 } else {
 7975                         start_at = TAILQ_NEXT(asoc->last_net_cmt_send_started, sctp_next);
 7976                         if (start_at == NULL) {
 7977                                 start_at = TAILQ_FIRST(&asoc->nets);
 7978                         }
 7979                 }
 7980                 asoc->last_net_cmt_send_started = start_at;
 7981         } else {
 7982                 start_at = TAILQ_FIRST(&asoc->nets);
 7983         }
 7984         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 7985                 if (chk->whoTo == NULL) {
 7986                         if (asoc->alternate) {
 7987                                 chk->whoTo = asoc->alternate;
 7988                         } else {
 7989                                 chk->whoTo = asoc->primary_destination;
 7990                         }
 7991                         atomic_add_int(&chk->whoTo->ref_count, 1);
 7992                 }
 7993         }
 7994         old_start_at = NULL;
 7995 again_one_more_time:
 7996         for (net = start_at; net != NULL; net = TAILQ_NEXT(net, sctp_next)) {
 7997                 /* how much can we send? */
 7998                 /* SCTPDBG("Examine for sending net:%x\n", (uint32_t)net); */
 7999                 if (old_start_at && (old_start_at == net)) {
 8000                         /* through list ocmpletely. */
 8001                         break;
 8002                 }
 8003                 tsns_sent = 0xa;
 8004                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
 8005                     TAILQ_EMPTY(&asoc->asconf_send_queue) &&
 8006                     (net->flight_size >= net->cwnd)) {
 8007                         /*
 8008                          * Nothing on control or asconf and flight is full,
 8009                          * we can skip even in the CMT case.
 8010                          */
 8011                         continue;
 8012                 }
 8013                 bundle_at = 0;
 8014                 endoutchain = outchain = NULL;
 8015                 no_fragmentflg = 1;
 8016                 one_chunk = 0;
 8017                 if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
 8018                         skip_data_for_this_net = 1;
 8019                 } else {
 8020                         skip_data_for_this_net = 0;
 8021                 }
 8022                 if ((net->ro.ro_rt) && (net->ro.ro_rt->rt_ifp)) {
 8023                         /*
 8024                          * if we have a route and an ifp check to see if we
 8025                          * have room to send to this guy
 8026                          */
 8027                         struct ifnet *ifp;
 8028 
 8029                         ifp = net->ro.ro_rt->rt_ifp;
 8030                         if ((ifp->if_snd.ifq_len + 2) >= ifp->if_snd.ifq_maxlen) {
 8031                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
 8032                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
 8033                                         sctp_log_maxburst(stcb, net, ifp->if_snd.ifq_len, ifp->if_snd.ifq_maxlen, SCTP_MAX_IFP_APPLIED);
 8034                                 }
 8035                                 continue;
 8036                         }
 8037                 }
 8038                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8039 #ifdef INET
 8040                 case AF_INET:
 8041                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8042                         break;
 8043 #endif
 8044 #ifdef INET6
 8045                 case AF_INET6:
 8046                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8047                         break;
 8048 #endif
 8049                 default:
 8050                         /* TSNH */
 8051                         mtu = net->mtu;
 8052                         break;
 8053                 }
 8054                 mx_mtu = mtu;
 8055                 to_out = 0;
 8056                 if (mtu > asoc->peers_rwnd) {
 8057                         if (asoc->total_flight > 0) {
 8058                                 /* We have a packet in flight somewhere */
 8059                                 r_mtu = asoc->peers_rwnd;
 8060                         } else {
 8061                                 /* We are always allowed to send one MTU out */
 8062                                 one_chunk = 1;
 8063                                 r_mtu = mtu;
 8064                         }
 8065                 } else {
 8066                         r_mtu = mtu;
 8067                 }
 8068                 error = 0;
 8069                 /************************/
 8070                 /* ASCONF transmission */
 8071                 /************************/
 8072                 /* Now first lets go through the asconf queue */
 8073                 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
 8074                         if (chk->rec.chunk_id.id != SCTP_ASCONF) {
 8075                                 continue;
 8076                         }
 8077                         if (chk->whoTo == NULL) {
 8078                                 if (asoc->alternate == NULL) {
 8079                                         if (asoc->primary_destination != net) {
 8080                                                 break;
 8081                                         }
 8082                                 } else {
 8083                                         if (asoc->alternate != net) {
 8084                                                 break;
 8085                                         }
 8086                                 }
 8087                         } else {
 8088                                 if (chk->whoTo != net) {
 8089                                         break;
 8090                                 }
 8091                         }
 8092                         if (chk->data == NULL) {
 8093                                 break;
 8094                         }
 8095                         if (chk->sent != SCTP_DATAGRAM_UNSENT &&
 8096                             chk->sent != SCTP_DATAGRAM_RESEND) {
 8097                                 break;
 8098                         }
 8099                         /*
 8100                          * if no AUTH is yet included and this chunk
 8101                          * requires it, make sure to account for it.  We
 8102                          * don't apply the size until the AUTH chunk is
 8103                          * actually added below in case there is no room for
 8104                          * this chunk. NOTE: we overload the use of "omtu"
 8105                          * here
 8106                          */
 8107                         if ((auth == NULL) &&
 8108                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8109                             stcb->asoc.peer_auth_chunks)) {
 8110                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8111                         } else
 8112                                 omtu = 0;
 8113                         /* Here we do NOT factor the r_mtu */
 8114                         if ((chk->send_size < (int)(mtu - omtu)) ||
 8115                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8116                                 /*
 8117                                  * We probably should glom the mbuf chain
 8118                                  * from the chk->data for control but the
 8119                                  * problem is it becomes yet one more level
 8120                                  * of tracking to do if for some reason
 8121                                  * output fails. Then I have got to
 8122                                  * reconstruct the merged control chain.. el
 8123                                  * yucko.. for now we take the easy way and
 8124                                  * do the copy
 8125                                  */
 8126                                 /*
 8127                                  * Add an AUTH chunk, if chunk requires it
 8128                                  * save the offset into the chain for AUTH
 8129                                  */
 8130                                 if ((auth == NULL) &&
 8131                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8132                                     stcb->asoc.peer_auth_chunks))) {
 8133                                         outchain = sctp_add_auth_chunk(outchain,
 8134                                             &endoutchain,
 8135                                             &auth,
 8136                                             &auth_offset,
 8137                                             stcb,
 8138                                             chk->rec.chunk_id.id);
 8139                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8140                                 }
 8141                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8142                                     (int)chk->rec.chunk_id.can_take_data,
 8143                                     chk->send_size, chk->copy_by_ref);
 8144                                 if (outchain == NULL) {
 8145                                         *reason_code = 8;
 8146                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8147                                         return (ENOMEM);
 8148                                 }
 8149                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8150                                 /* update our MTU size */
 8151                                 if (mtu > (chk->send_size + omtu))
 8152                                         mtu -= (chk->send_size + omtu);
 8153                                 else
 8154                                         mtu = 0;
 8155                                 to_out += (chk->send_size + omtu);
 8156                                 /* Do clear IP_DF ? */
 8157                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8158                                         no_fragmentflg = 0;
 8159                                 }
 8160                                 if (chk->rec.chunk_id.can_take_data)
 8161                                         chk->data = NULL;
 8162                                 /*
 8163                                  * set hb flag since we can use these for
 8164                                  * RTO
 8165                                  */
 8166                                 hbflag = 1;
 8167                                 asconf = 1;
 8168                                 /*
 8169                                  * should sysctl this: don't bundle data
 8170                                  * with ASCONF since it requires AUTH
 8171                                  */
 8172                                 no_data_chunks = 1;
 8173                                 chk->sent = SCTP_DATAGRAM_SENT;
 8174                                 if (chk->whoTo == NULL) {
 8175                                         chk->whoTo = net;
 8176                                         atomic_add_int(&net->ref_count, 1);
 8177                                 }
 8178                                 chk->snd_count++;
 8179                                 if (mtu == 0) {
 8180                                         /*
 8181                                          * Ok we are out of room but we can
 8182                                          * output without effecting the
 8183                                          * flight size since this little guy
 8184                                          * is a control only packet.
 8185                                          */
 8186                                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8187                                         /*
 8188                                          * do NOT clear the asconf flag as
 8189                                          * it is used to do appropriate
 8190                                          * source address selection.
 8191                                          */
 8192                                         if (*now_filled == 0) {
 8193                                                 (void)SCTP_GETTIME_TIMEVAL(now);
 8194                                                 *now_filled = 1;
 8195                                         }
 8196                                         net->last_sent_time = *now;
 8197                                         hbflag = 0;
 8198                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8199                                             (struct sockaddr *)&net->ro._l_addr,
 8200                                             outchain, auth_offset, auth,
 8201                                             stcb->asoc.authinfo.active_keyid,
 8202                                             no_fragmentflg, 0, asconf,
 8203                                             inp->sctp_lport, stcb->rport,
 8204                                             htonl(stcb->asoc.peer_vtag),
 8205                                             net->port, NULL,
 8206                                             0, 0,
 8207                                             so_locked))) {
 8208                                                 /*
 8209                                                  * error, we could not
 8210                                                  * output
 8211                                                  */
 8212                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8213                                                 if (from_where == 0) {
 8214                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8215                                                 }
 8216                                                 if (error == ENOBUFS) {
 8217                                                         asoc->ifp_had_enobuf = 1;
 8218                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8219                                                 }
 8220                                                 /* error, could not output */
 8221                                                 if (error == EHOSTUNREACH) {
 8222                                                         /*
 8223                                                          * Destination went
 8224                                                          * unreachable
 8225                                                          * during this send
 8226                                                          */
 8227                                                         sctp_move_chunks_from_net(stcb, net);
 8228                                                 }
 8229                                                 *reason_code = 7;
 8230                                                 break;
 8231                                         } else {
 8232                                                 asoc->ifp_had_enobuf = 0;
 8233                                         }
 8234                                         /*
 8235                                          * increase the number we sent, if a
 8236                                          * cookie is sent we don't tell them
 8237                                          * any was sent out.
 8238                                          */
 8239                                         outchain = endoutchain = NULL;
 8240                                         auth = NULL;
 8241                                         auth_offset = 0;
 8242                                         if (!no_out_cnt)
 8243                                                 *num_out += ctl_cnt;
 8244                                         /* recalc a clean slate and setup */
 8245                                         switch (net->ro._l_addr.sa.sa_family) {
 8246 #ifdef INET
 8247                                         case AF_INET:
 8248                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8249                                                 break;
 8250 #endif
 8251 #ifdef INET6
 8252                                         case AF_INET6:
 8253                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8254                                                 break;
 8255 #endif
 8256                                         default:
 8257                                                 /* TSNH */
 8258                                                 mtu = net->mtu;
 8259                                                 break;
 8260                                         }
 8261                                         to_out = 0;
 8262                                         no_fragmentflg = 1;
 8263                                 }
 8264                         }
 8265                 }
 8266                 if (error != 0) {
 8267                         /* try next net */
 8268                         continue;
 8269                 }
 8270                 /************************/
 8271                 /* Control transmission */
 8272                 /************************/
 8273                 /* Now first lets go through the control queue */
 8274                 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
 8275                         if ((sack_goes_to) &&
 8276                             (chk->rec.chunk_id.id == SCTP_ECN_ECHO) &&
 8277                             (chk->whoTo != sack_goes_to)) {
 8278                                 /*
 8279                                  * if we have a sack in queue, and we are
 8280                                  * looking at an ecn echo that is NOT queued
 8281                                  * to where the sack is going..
 8282                                  */
 8283                                 if (chk->whoTo == net) {
 8284                                         /*
 8285                                          * Don't transmit it to where its
 8286                                          * going (current net)
 8287                                          */
 8288                                         continue;
 8289                                 } else if (sack_goes_to == net) {
 8290                                         /*
 8291                                          * But do transmit it to this
 8292                                          * address
 8293                                          */
 8294                                         goto skip_net_check;
 8295                                 }
 8296                         }
 8297                         if (chk->whoTo == NULL) {
 8298                                 if (asoc->alternate == NULL) {
 8299                                         if (asoc->primary_destination != net) {
 8300                                                 continue;
 8301                                         }
 8302                                 } else {
 8303                                         if (asoc->alternate != net) {
 8304                                                 continue;
 8305                                         }
 8306                                 }
 8307                         } else {
 8308                                 if (chk->whoTo != net) {
 8309                                         continue;
 8310                                 }
 8311                         }
 8312         skip_net_check:
 8313                         if (chk->data == NULL) {
 8314                                 continue;
 8315                         }
 8316                         if (chk->sent != SCTP_DATAGRAM_UNSENT) {
 8317                                 /*
 8318                                  * It must be unsent. Cookies and ASCONF's
 8319                                  * hang around but there timers will force
 8320                                  * when marked for resend.
 8321                                  */
 8322                                 continue;
 8323                         }
 8324                         /*
 8325                          * if no AUTH is yet included and this chunk
 8326                          * requires it, make sure to account for it.  We
 8327                          * don't apply the size until the AUTH chunk is
 8328                          * actually added below in case there is no room for
 8329                          * this chunk. NOTE: we overload the use of "omtu"
 8330                          * here
 8331                          */
 8332                         if ((auth == NULL) &&
 8333                             sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8334                             stcb->asoc.peer_auth_chunks)) {
 8335                                 omtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8336                         } else
 8337                                 omtu = 0;
 8338                         /* Here we do NOT factor the r_mtu */
 8339                         if ((chk->send_size <= (int)(mtu - omtu)) ||
 8340                             (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 8341                                 /*
 8342                                  * We probably should glom the mbuf chain
 8343                                  * from the chk->data for control but the
 8344                                  * problem is it becomes yet one more level
 8345                                  * of tracking to do if for some reason
 8346                                  * output fails. Then I have got to
 8347                                  * reconstruct the merged control chain.. el
 8348                                  * yucko.. for now we take the easy way and
 8349                                  * do the copy
 8350                                  */
 8351                                 /*
 8352                                  * Add an AUTH chunk, if chunk requires it
 8353                                  * save the offset into the chain for AUTH
 8354                                  */
 8355                                 if ((auth == NULL) &&
 8356                                     (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 8357                                     stcb->asoc.peer_auth_chunks))) {
 8358                                         outchain = sctp_add_auth_chunk(outchain,
 8359                                             &endoutchain,
 8360                                             &auth,
 8361                                             &auth_offset,
 8362                                             stcb,
 8363                                             chk->rec.chunk_id.id);
 8364                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8365                                 }
 8366                                 outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain,
 8367                                     (int)chk->rec.chunk_id.can_take_data,
 8368                                     chk->send_size, chk->copy_by_ref);
 8369                                 if (outchain == NULL) {
 8370                                         *reason_code = 8;
 8371                                         SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8372                                         return (ENOMEM);
 8373                                 }
 8374                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8375                                 /* update our MTU size */
 8376                                 if (mtu > (chk->send_size + omtu))
 8377                                         mtu -= (chk->send_size + omtu);
 8378                                 else
 8379                                         mtu = 0;
 8380                                 to_out += (chk->send_size + omtu);
 8381                                 /* Do clear IP_DF ? */
 8382                                 if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8383                                         no_fragmentflg = 0;
 8384                                 }
 8385                                 if (chk->rec.chunk_id.can_take_data)
 8386                                         chk->data = NULL;
 8387                                 /* Mark things to be removed, if needed */
 8388                                 if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8389                                     (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK) ||  /* EY */
 8390                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) ||
 8391                                     (chk->rec.chunk_id.id == SCTP_HEARTBEAT_ACK) ||
 8392                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN) ||
 8393                                     (chk->rec.chunk_id.id == SCTP_SHUTDOWN_ACK) ||
 8394                                     (chk->rec.chunk_id.id == SCTP_OPERATION_ERROR) ||
 8395                                     (chk->rec.chunk_id.id == SCTP_COOKIE_ACK) ||
 8396                                     (chk->rec.chunk_id.id == SCTP_ECN_CWR) ||
 8397                                     (chk->rec.chunk_id.id == SCTP_PACKET_DROPPED) ||
 8398                                     (chk->rec.chunk_id.id == SCTP_ASCONF_ACK)) {
 8399                                         if (chk->rec.chunk_id.id == SCTP_HEARTBEAT_REQUEST) {
 8400                                                 hbflag = 1;
 8401                                         }
 8402                                         /* remove these chunks at the end */
 8403                                         if ((chk->rec.chunk_id.id == SCTP_SELECTIVE_ACK) ||
 8404                                             (chk->rec.chunk_id.id == SCTP_NR_SELECTIVE_ACK)) {
 8405                                                 /* turn off the timer */
 8406                                                 if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 8407                                                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
 8408                                                             inp, stcb, net,
 8409                                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_1);
 8410                                                 }
 8411                                         }
 8412                                         ctl_cnt++;
 8413                                 } else {
 8414                                         /*
 8415                                          * Other chunks, since they have
 8416                                          * timers running (i.e. COOKIE) we
 8417                                          * just "trust" that it gets sent or
 8418                                          * retransmitted.
 8419                                          */
 8420                                         ctl_cnt++;
 8421                                         if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 8422                                                 cookie = 1;
 8423                                                 no_out_cnt = 1;
 8424                                         } else if (chk->rec.chunk_id.id == SCTP_ECN_ECHO) {
 8425                                                 /*
 8426                                                  * Increment ecne send count
 8427                                                  * here this means we may be
 8428                                                  * over-zealous in our
 8429                                                  * counting if the send
 8430                                                  * fails, but its the best
 8431                                                  * place to do it (we used
 8432                                                  * to do it in the queue of
 8433                                                  * the chunk, but that did
 8434                                                  * not tell how many times
 8435                                                  * it was sent.
 8436                                                  */
 8437                                                 SCTP_STAT_INCR(sctps_sendecne);
 8438                                         }
 8439                                         chk->sent = SCTP_DATAGRAM_SENT;
 8440                                         if (chk->whoTo == NULL) {
 8441                                                 chk->whoTo = net;
 8442                                                 atomic_add_int(&net->ref_count, 1);
 8443                                         }
 8444                                         chk->snd_count++;
 8445                                 }
 8446                                 if (mtu == 0) {
 8447                                         /*
 8448                                          * Ok we are out of room but we can
 8449                                          * output without effecting the
 8450                                          * flight size since this little guy
 8451                                          * is a control only packet.
 8452                                          */
 8453                                         if (asconf) {
 8454                                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, net);
 8455                                                 /*
 8456                                                  * do NOT clear the asconf
 8457                                                  * flag as it is used to do
 8458                                                  * appropriate source
 8459                                                  * address selection.
 8460                                                  */
 8461                                         }
 8462                                         if (cookie) {
 8463                                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8464                                                 cookie = 0;
 8465                                         }
 8466                                         /* Only HB or ASCONF advances time */
 8467                                         if (hbflag) {
 8468                                                 if (*now_filled == 0) {
 8469                                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8470                                                         *now_filled = 1;
 8471                                                 }
 8472                                                 net->last_sent_time = *now;
 8473                                                 hbflag = 0;
 8474                                         }
 8475                                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 8476                                             (struct sockaddr *)&net->ro._l_addr,
 8477                                             outchain,
 8478                                             auth_offset, auth,
 8479                                             stcb->asoc.authinfo.active_keyid,
 8480                                             no_fragmentflg, 0, asconf,
 8481                                             inp->sctp_lport, stcb->rport,
 8482                                             htonl(stcb->asoc.peer_vtag),
 8483                                             net->port, NULL,
 8484                                             0, 0,
 8485                                             so_locked))) {
 8486                                                 /*
 8487                                                  * error, we could not
 8488                                                  * output
 8489                                                  */
 8490                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8491                                                 if (from_where == 0) {
 8492                                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8493                                                 }
 8494                                                 if (error == ENOBUFS) {
 8495                                                         asoc->ifp_had_enobuf = 1;
 8496                                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8497                                                 }
 8498                                                 if (error == EHOSTUNREACH) {
 8499                                                         /*
 8500                                                          * Destination went
 8501                                                          * unreachable
 8502                                                          * during this send
 8503                                                          */
 8504                                                         sctp_move_chunks_from_net(stcb, net);
 8505                                                 }
 8506                                                 *reason_code = 7;
 8507                                                 break;
 8508                                         } else {
 8509                                                 asoc->ifp_had_enobuf = 0;
 8510                                         }
 8511                                         /*
 8512                                          * increase the number we sent, if a
 8513                                          * cookie is sent we don't tell them
 8514                                          * any was sent out.
 8515                                          */
 8516                                         outchain = endoutchain = NULL;
 8517                                         auth = NULL;
 8518                                         auth_offset = 0;
 8519                                         if (!no_out_cnt)
 8520                                                 *num_out += ctl_cnt;
 8521                                         /* recalc a clean slate and setup */
 8522                                         switch (net->ro._l_addr.sa.sa_family) {
 8523 #ifdef INET
 8524                                         case AF_INET:
 8525                                                 mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8526                                                 break;
 8527 #endif
 8528 #ifdef INET6
 8529                                         case AF_INET6:
 8530                                                 mtu = net->mtu - SCTP_MIN_OVERHEAD;
 8531                                                 break;
 8532 #endif
 8533                                         default:
 8534                                                 /* TSNH */
 8535                                                 mtu = net->mtu;
 8536                                                 break;
 8537                                         }
 8538                                         to_out = 0;
 8539                                         no_fragmentflg = 1;
 8540                                 }
 8541                         }
 8542                 }
 8543                 if (error != 0) {
 8544                         /* try next net */
 8545                         continue;
 8546                 }
 8547                 /* JRI: if dest is in PF state, do not send data to it */
 8548                 if ((asoc->sctp_cmt_on_off > 0) &&
 8549                     (net != stcb->asoc.alternate) &&
 8550                     (net->dest_state & SCTP_ADDR_PF)) {
 8551                         goto no_data_fill;
 8552                 }
 8553                 if (net->flight_size >= net->cwnd) {
 8554                         goto no_data_fill;
 8555                 }
 8556                 if ((asoc->sctp_cmt_on_off > 0) &&
 8557                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_RECV_BUFFER_SPLITTING) &&
 8558                     (net->flight_size > max_rwnd_per_dest)) {
 8559                         goto no_data_fill;
 8560                 }
 8561                 /*
 8562                  * We need a specific accounting for the usage of the send
 8563                  * buffer. We also need to check the number of messages per
 8564                  * net. For now, this is better than nothing and it disabled
 8565                  * by default...
 8566                  */
 8567                 if ((asoc->sctp_cmt_on_off > 0) &&
 8568                     (SCTP_BASE_SYSCTL(sctp_buffer_splitting) & SCTP_SEND_BUFFER_SPLITTING) &&
 8569                     (max_send_per_dest > 0) &&
 8570                     (net->flight_size > max_send_per_dest)) {
 8571                         goto no_data_fill;
 8572                 }
 8573                 /*********************/
 8574                 /* Data transmission */
 8575                 /*********************/
 8576                 /*
 8577                  * if AUTH for DATA is required and no AUTH has been added
 8578                  * yet, account for this in the mtu now... if no data can be
 8579                  * bundled, this adjustment won't matter anyways since the
 8580                  * packet will be going out...
 8581                  */
 8582                 data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA,
 8583                     stcb->asoc.peer_auth_chunks);
 8584                 if (data_auth_reqd && (auth == NULL)) {
 8585                         mtu -= sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 8586                 }
 8587                 /* now lets add any data within the MTU constraints */
 8588                 switch (((struct sockaddr *)&net->ro._l_addr)->sa_family) {
 8589 #ifdef INET
 8590                 case AF_INET:
 8591                         if (net->mtu > SCTP_MIN_V4_OVERHEAD)
 8592                                 omtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 8593                         else
 8594                                 omtu = 0;
 8595                         break;
 8596 #endif
 8597 #ifdef INET6
 8598                 case AF_INET6:
 8599                         if (net->mtu > SCTP_MIN_OVERHEAD)
 8600                                 omtu = net->mtu - SCTP_MIN_OVERHEAD;
 8601                         else
 8602                                 omtu = 0;
 8603                         break;
 8604 #endif
 8605                 default:
 8606                         /* TSNH */
 8607                         omtu = 0;
 8608                         break;
 8609                 }
 8610                 if ((((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
 8611                     (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) &&
 8612                     (skip_data_for_this_net == 0)) ||
 8613                     (cookie)) {
 8614                         TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
 8615                                 if (no_data_chunks) {
 8616                                         /* let only control go out */
 8617                                         *reason_code = 1;
 8618                                         break;
 8619                                 }
 8620                                 if (net->flight_size >= net->cwnd) {
 8621                                         /* skip this net, no room for data */
 8622                                         *reason_code = 2;
 8623                                         break;
 8624                                 }
 8625                                 if ((chk->whoTo != NULL) &&
 8626                                     (chk->whoTo != net)) {
 8627                                         /* Don't send the chunk on this net */
 8628                                         continue;
 8629                                 }
 8630                                 if (asoc->sctp_cmt_on_off == 0) {
 8631                                         if ((asoc->alternate) &&
 8632                                             (asoc->alternate != net) &&
 8633                                             (chk->whoTo == NULL)) {
 8634                                                 continue;
 8635                                         } else if ((net != asoc->primary_destination) &&
 8636                                                     (asoc->alternate == NULL) &&
 8637                                             (chk->whoTo == NULL)) {
 8638                                                 continue;
 8639                                         }
 8640                                 }
 8641                                 if ((chk->send_size > omtu) && ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) == 0)) {
 8642                                         /*-
 8643                                          * strange, we have a chunk that is
 8644                                          * to big for its destination and
 8645                                          * yet no fragment ok flag.
 8646                                          * Something went wrong when the
 8647                                          * PMTU changed...we did not mark
 8648                                          * this chunk for some reason?? I
 8649                                          * will fix it here by letting IP
 8650                                          * fragment it for now and printing
 8651                                          * a warning. This really should not
 8652                                          * happen ...
 8653                                          */
 8654                                         SCTP_PRINTF("Warning chunk of %d bytes > mtu:%d and yet PMTU disc missed\n",
 8655                                             chk->send_size, mtu);
 8656                                         chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
 8657                                 }
 8658                                 if (SCTP_BASE_SYSCTL(sctp_enable_sack_immediately) &&
 8659                                     ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) == SCTP_STATE_SHUTDOWN_PENDING)) {
 8660                                         struct sctp_data_chunk *dchkh;
 8661 
 8662                                         dchkh = mtod(chk->data, struct sctp_data_chunk *);
 8663                                         dchkh->ch.chunk_flags |= SCTP_DATA_SACK_IMMEDIATELY;
 8664                                 }
 8665                                 if (((chk->send_size <= mtu) && (chk->send_size <= r_mtu)) ||
 8666                                     ((chk->flags & CHUNK_FLAGS_FRAGMENT_OK) && (chk->send_size <= asoc->peers_rwnd))) {
 8667                                         /* ok we will add this one */
 8668 
 8669                                         /*
 8670                                          * Add an AUTH chunk, if chunk
 8671                                          * requires it, save the offset into
 8672                                          * the chain for AUTH
 8673                                          */
 8674                                         if (data_auth_reqd) {
 8675                                                 if (auth == NULL) {
 8676                                                         outchain = sctp_add_auth_chunk(outchain,
 8677                                                             &endoutchain,
 8678                                                             &auth,
 8679                                                             &auth_offset,
 8680                                                             stcb,
 8681                                                             SCTP_DATA);
 8682                                                         auth_keyid = chk->auth_keyid;
 8683                                                         override_ok = 0;
 8684                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 8685                                                 } else if (override_ok) {
 8686                                                         /*
 8687                                                          * use this data's
 8688                                                          * keyid
 8689                                                          */
 8690                                                         auth_keyid = chk->auth_keyid;
 8691                                                         override_ok = 0;
 8692                                                 } else if (auth_keyid != chk->auth_keyid) {
 8693                                                         /*
 8694                                                          * different keyid,
 8695                                                          * so done bundling
 8696                                                          */
 8697                                                         break;
 8698                                                 }
 8699                                         }
 8700                                         outchain = sctp_copy_mbufchain(chk->data, outchain, &endoutchain, 0,
 8701                                             chk->send_size, chk->copy_by_ref);
 8702                                         if (outchain == NULL) {
 8703                                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "No memory?\n");
 8704                                                 if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 8705                                                         sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8706                                                 }
 8707                                                 *reason_code = 3;
 8708                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 8709                                                 return (ENOMEM);
 8710                                         }
 8711                                         /* upate our MTU size */
 8712                                         /* Do clear IP_DF ? */
 8713                                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 8714                                                 no_fragmentflg = 0;
 8715                                         }
 8716                                         /* unsigned subtraction of mtu */
 8717                                         if (mtu > chk->send_size)
 8718                                                 mtu -= chk->send_size;
 8719                                         else
 8720                                                 mtu = 0;
 8721                                         /* unsigned subtraction of r_mtu */
 8722                                         if (r_mtu > chk->send_size)
 8723                                                 r_mtu -= chk->send_size;
 8724                                         else
 8725                                                 r_mtu = 0;
 8726 
 8727                                         to_out += chk->send_size;
 8728                                         if ((to_out > mx_mtu) && no_fragmentflg) {
 8729 #ifdef INVARIANTS
 8730                                                 panic("Exceeding mtu of %d out size is %d", mx_mtu, to_out);
 8731 #else
 8732                                                 SCTP_PRINTF("Exceeding mtu of %d out size is %d\n",
 8733                                                     mx_mtu, to_out);
 8734 #endif
 8735                                         }
 8736                                         chk->window_probe = 0;
 8737                                         data_list[bundle_at++] = chk;
 8738                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 8739                                                 break;
 8740                                         }
 8741                                         if (chk->sent == SCTP_DATAGRAM_UNSENT) {
 8742                                                 if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
 8743                                                         SCTP_STAT_INCR_COUNTER64(sctps_outorderchunks);
 8744                                                 } else {
 8745                                                         SCTP_STAT_INCR_COUNTER64(sctps_outunorderchunks);
 8746                                                 }
 8747                                                 if (((chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) &&
 8748                                                     ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0))
 8749                                                         /*
 8750                                                          * Count number of
 8751                                                          * user msg's that
 8752                                                          * were fragmented
 8753                                                          * we do this by
 8754                                                          * counting when we
 8755                                                          * see a LAST
 8756                                                          * fragment only.
 8757                                                          */
 8758                                                         SCTP_STAT_INCR_COUNTER64(sctps_fragusrmsgs);
 8759                                         }
 8760                                         if ((mtu == 0) || (r_mtu == 0) || (one_chunk)) {
 8761                                                 if ((one_chunk) && (stcb->asoc.total_flight == 0)) {
 8762                                                         data_list[0]->window_probe = 1;
 8763                                                         net->window_probe = 1;
 8764                                                 }
 8765                                                 break;
 8766                                         }
 8767                                 } else {
 8768                                         /*
 8769                                          * Must be sent in order of the
 8770                                          * TSN's (on a network)
 8771                                          */
 8772                                         break;
 8773                                 }
 8774                         }       /* for (chunk gather loop for this net) */
 8775                 }               /* if asoc.state OPEN */
 8776 no_data_fill:
 8777                 /* Is there something to send for this destination? */
 8778                 if (outchain) {
 8779                         /* We may need to start a control timer or two */
 8780                         if (asconf) {
 8781                                 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
 8782                                     stcb, net);
 8783                                 /*
 8784                                  * do NOT clear the asconf flag as it is
 8785                                  * used to do appropriate source address
 8786                                  * selection.
 8787                                  */
 8788                         }
 8789                         if (cookie) {
 8790                                 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, net);
 8791                                 cookie = 0;
 8792                         }
 8793                         /* must start a send timer if data is being sent */
 8794                         if (bundle_at && (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer))) {
 8795                                 /*
 8796                                  * no timer running on this destination
 8797                                  * restart it.
 8798                                  */
 8799                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 8800                         }
 8801                         if (bundle_at || hbflag) {
 8802                                 /* For data/asconf and hb set time */
 8803                                 if (*now_filled == 0) {
 8804                                         (void)SCTP_GETTIME_TIMEVAL(now);
 8805                                         *now_filled = 1;
 8806                                 }
 8807                                 net->last_sent_time = *now;
 8808                         }
 8809                         /* Now send it, if there is anything to send :> */
 8810                         if ((error = sctp_lowlevel_chunk_output(inp,
 8811                             stcb,
 8812                             net,
 8813                             (struct sockaddr *)&net->ro._l_addr,
 8814                             outchain,
 8815                             auth_offset,
 8816                             auth,
 8817                             auth_keyid,
 8818                             no_fragmentflg,
 8819                             bundle_at,
 8820                             asconf,
 8821                             inp->sctp_lport, stcb->rport,
 8822                             htonl(stcb->asoc.peer_vtag),
 8823                             net->port, NULL,
 8824                             0, 0,
 8825                             so_locked))) {
 8826                                 /* error, we could not output */
 8827                                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "Gak send error %d\n", error);
 8828                                 if (from_where == 0) {
 8829                                         SCTP_STAT_INCR(sctps_lowlevelerrusr);
 8830                                 }
 8831                                 if (error == ENOBUFS) {
 8832                                         SCTP_STAT_INCR(sctps_lowlevelerr);
 8833                                         asoc->ifp_had_enobuf = 1;
 8834                                 }
 8835                                 if (error == EHOSTUNREACH) {
 8836                                         /*
 8837                                          * Destination went unreachable
 8838                                          * during this send
 8839                                          */
 8840                                         sctp_move_chunks_from_net(stcb, net);
 8841                                 }
 8842                                 *reason_code = 6;
 8843                                 /*-
 8844                                  * I add this line to be paranoid. As far as
 8845                                  * I can tell the continue, takes us back to
 8846                                  * the top of the for, but just to make sure
 8847                                  * I will reset these again here.
 8848                                  */
 8849                                 ctl_cnt = bundle_at = 0;
 8850                                 continue;       /* This takes us back to the
 8851                                                  * for() for the nets. */
 8852                         } else {
 8853                                 asoc->ifp_had_enobuf = 0;
 8854                         }
 8855                         endoutchain = NULL;
 8856                         auth = NULL;
 8857                         auth_offset = 0;
 8858                         if (!no_out_cnt) {
 8859                                 *num_out += (ctl_cnt + bundle_at);
 8860                         }
 8861                         if (bundle_at) {
 8862                                 /* setup for a RTO measurement */
 8863                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
 8864                                 /* fill time if not already filled */
 8865                                 if (*now_filled == 0) {
 8866                                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 8867                                         *now_filled = 1;
 8868                                         *now = asoc->time_last_sent;
 8869                                 } else {
 8870                                         asoc->time_last_sent = *now;
 8871                                 }
 8872                                 if (net->rto_needed) {
 8873                                         data_list[0]->do_rtt = 1;
 8874                                         net->rto_needed = 0;
 8875                                 }
 8876                                 SCTP_STAT_INCR_BY(sctps_senddata, bundle_at);
 8877                                 sctp_clean_up_datalist(stcb, asoc, data_list, bundle_at, net);
 8878                         }
 8879                         if (one_chunk) {
 8880                                 break;
 8881                         }
 8882                 }
 8883                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8884                         sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_SEND);
 8885                 }
 8886         }
 8887         if (old_start_at == NULL) {
 8888                 old_start_at = start_at;
 8889                 start_at = TAILQ_FIRST(&asoc->nets);
 8890                 if (old_start_at)
 8891                         goto again_one_more_time;
 8892         }
 8893         /*
 8894          * At the end there should be no NON timed chunks hanging on this
 8895          * queue.
 8896          */
 8897         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 8898                 sctp_log_cwnd(stcb, net, *num_out, SCTP_CWND_LOG_FROM_SEND);
 8899         }
 8900         if ((*num_out == 0) && (*reason_code == 0)) {
 8901                 *reason_code = 4;
 8902         } else {
 8903                 *reason_code = 5;
 8904         }
 8905         sctp_clean_up_ctl(stcb, asoc, so_locked);
 8906         return (0);
 8907 }
 8908 
 8909 void
 8910 sctp_queue_op_err(struct sctp_tcb *stcb, struct mbuf *op_err)
 8911 {
 8912         /*-
 8913          * Prepend a OPERATIONAL_ERROR chunk header and put on the end of
 8914          * the control chunk queue.
 8915          */
 8916         struct sctp_chunkhdr *hdr;
 8917         struct sctp_tmit_chunk *chk;
 8918         struct mbuf *mat, *last_mbuf;
 8919         uint32_t chunk_length;
 8920         uint16_t padding_length;
 8921 
 8922         SCTP_TCB_LOCK_ASSERT(stcb);
 8923         SCTP_BUF_PREPEND(op_err, sizeof(struct sctp_chunkhdr), M_NOWAIT);
 8924         if (op_err == NULL) {
 8925                 return;
 8926         }
 8927         last_mbuf = NULL;
 8928         chunk_length = 0;
 8929         for (mat = op_err; mat != NULL; mat = SCTP_BUF_NEXT(mat)) {
 8930                 chunk_length += SCTP_BUF_LEN(mat);
 8931                 if (SCTP_BUF_NEXT(mat) == NULL) {
 8932                         last_mbuf = mat;
 8933                 }
 8934         }
 8935         if (chunk_length > SCTP_MAX_CHUNK_LENGTH) {
 8936                 sctp_m_freem(op_err);
 8937                 return;
 8938         }
 8939         padding_length = chunk_length % 4;
 8940         if (padding_length != 0) {
 8941                 padding_length = 4 - padding_length;
 8942         }
 8943         if (padding_length != 0) {
 8944                 if (sctp_add_pad_tombuf(last_mbuf, padding_length) == NULL) {
 8945                         sctp_m_freem(op_err);
 8946                         return;
 8947                 }
 8948         }
 8949         sctp_alloc_a_chunk(stcb, chk);
 8950         if (chk == NULL) {
 8951                 /* no memory */
 8952                 sctp_m_freem(op_err);
 8953                 return;
 8954         }
 8955         chk->copy_by_ref = 0;
 8956         chk->send_size = (uint16_t) chunk_length;
 8957         chk->sent = SCTP_DATAGRAM_UNSENT;
 8958         chk->snd_count = 0;
 8959         chk->asoc = &stcb->asoc;
 8960         chk->data = op_err;
 8961         chk->whoTo = NULL;
 8962         hdr = mtod(op_err, struct sctp_chunkhdr *);
 8963         hdr->chunk_type = SCTP_OPERATION_ERROR;
 8964         hdr->chunk_flags = 0;
 8965         hdr->chunk_length = htons(chk->send_size);
 8966         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 8967         chk->asoc->ctrl_queue_cnt++;
 8968 }
 8969 
 8970 int
 8971 sctp_send_cookie_echo(struct mbuf *m,
 8972     int offset,
 8973     struct sctp_tcb *stcb,
 8974     struct sctp_nets *net)
 8975 {
 8976         /*-
 8977          * pull out the cookie and put it at the front of the control chunk
 8978          * queue.
 8979          */
 8980         int at;
 8981         struct mbuf *cookie;
 8982         struct sctp_paramhdr parm, *phdr;
 8983         struct sctp_chunkhdr *hdr;
 8984         struct sctp_tmit_chunk *chk;
 8985         uint16_t ptype, plen;
 8986 
 8987         SCTP_TCB_LOCK_ASSERT(stcb);
 8988         /* First find the cookie in the param area */
 8989         cookie = NULL;
 8990         at = offset + sizeof(struct sctp_init_chunk);
 8991         for (;;) {
 8992                 phdr = sctp_get_next_param(m, at, &parm, sizeof(parm));
 8993                 if (phdr == NULL) {
 8994                         return (-3);
 8995                 }
 8996                 ptype = ntohs(phdr->param_type);
 8997                 plen = ntohs(phdr->param_length);
 8998                 if (ptype == SCTP_STATE_COOKIE) {
 8999                         int pad;
 9000 
 9001                         /* found the cookie */
 9002                         if ((pad = (plen % 4))) {
 9003                                 plen += 4 - pad;
 9004                         }
 9005                         cookie = SCTP_M_COPYM(m, at, plen, M_NOWAIT);
 9006                         if (cookie == NULL) {
 9007                                 /* No memory */
 9008                                 return (-2);
 9009                         }
 9010 #ifdef SCTP_MBUF_LOGGING
 9011                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9012                                 sctp_log_mbc(cookie, SCTP_MBUF_ICOPY);
 9013                         }
 9014 #endif
 9015                         break;
 9016                 }
 9017                 at += SCTP_SIZE32(plen);
 9018         }
 9019         /* ok, we got the cookie lets change it into a cookie echo chunk */
 9020         /* first the change from param to cookie */
 9021         hdr = mtod(cookie, struct sctp_chunkhdr *);
 9022         hdr->chunk_type = SCTP_COOKIE_ECHO;
 9023         hdr->chunk_flags = 0;
 9024         /* get the chunk stuff now and place it in the FRONT of the queue */
 9025         sctp_alloc_a_chunk(stcb, chk);
 9026         if (chk == NULL) {
 9027                 /* no memory */
 9028                 sctp_m_freem(cookie);
 9029                 return (-5);
 9030         }
 9031         chk->copy_by_ref = 0;
 9032         chk->rec.chunk_id.id = SCTP_COOKIE_ECHO;
 9033         chk->rec.chunk_id.can_take_data = 0;
 9034         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9035         chk->send_size = plen;
 9036         chk->sent = SCTP_DATAGRAM_UNSENT;
 9037         chk->snd_count = 0;
 9038         chk->asoc = &stcb->asoc;
 9039         chk->data = cookie;
 9040         chk->whoTo = net;
 9041         atomic_add_int(&chk->whoTo->ref_count, 1);
 9042         TAILQ_INSERT_HEAD(&chk->asoc->control_send_queue, chk, sctp_next);
 9043         chk->asoc->ctrl_queue_cnt++;
 9044         return (0);
 9045 }
 9046 
 9047 void
 9048 sctp_send_heartbeat_ack(struct sctp_tcb *stcb,
 9049     struct mbuf *m,
 9050     int offset,
 9051     int chk_length,
 9052     struct sctp_nets *net)
 9053 {
 9054         /*
 9055          * take a HB request and make it into a HB ack and send it.
 9056          */
 9057         struct mbuf *outchain;
 9058         struct sctp_chunkhdr *chdr;
 9059         struct sctp_tmit_chunk *chk;
 9060 
 9061 
 9062         if (net == NULL)
 9063                 /* must have a net pointer */
 9064                 return;
 9065 
 9066         outchain = SCTP_M_COPYM(m, offset, chk_length, M_NOWAIT);
 9067         if (outchain == NULL) {
 9068                 /* gak out of memory */
 9069                 return;
 9070         }
 9071 #ifdef SCTP_MBUF_LOGGING
 9072         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9073                 sctp_log_mbc(outchain, SCTP_MBUF_ICOPY);
 9074         }
 9075 #endif
 9076         chdr = mtod(outchain, struct sctp_chunkhdr *);
 9077         chdr->chunk_type = SCTP_HEARTBEAT_ACK;
 9078         chdr->chunk_flags = 0;
 9079         if (chk_length % 4) {
 9080                 /* need pad */
 9081                 uint32_t cpthis = 0;
 9082                 int padlen;
 9083 
 9084                 padlen = 4 - (chk_length % 4);
 9085                 m_copyback(outchain, chk_length, padlen, (caddr_t)&cpthis);
 9086         }
 9087         sctp_alloc_a_chunk(stcb, chk);
 9088         if (chk == NULL) {
 9089                 /* no memory */
 9090                 sctp_m_freem(outchain);
 9091                 return;
 9092         }
 9093         chk->copy_by_ref = 0;
 9094         chk->rec.chunk_id.id = SCTP_HEARTBEAT_ACK;
 9095         chk->rec.chunk_id.can_take_data = 1;
 9096         chk->flags = 0;
 9097         chk->send_size = chk_length;
 9098         chk->sent = SCTP_DATAGRAM_UNSENT;
 9099         chk->snd_count = 0;
 9100         chk->asoc = &stcb->asoc;
 9101         chk->data = outchain;
 9102         chk->whoTo = net;
 9103         atomic_add_int(&chk->whoTo->ref_count, 1);
 9104         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9105         chk->asoc->ctrl_queue_cnt++;
 9106 }
 9107 
 9108 void
 9109 sctp_send_cookie_ack(struct sctp_tcb *stcb)
 9110 {
 9111         /* formulate and queue a cookie-ack back to sender */
 9112         struct mbuf *cookie_ack;
 9113         struct sctp_chunkhdr *hdr;
 9114         struct sctp_tmit_chunk *chk;
 9115 
 9116         SCTP_TCB_LOCK_ASSERT(stcb);
 9117 
 9118         cookie_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
 9119         if (cookie_ack == NULL) {
 9120                 /* no mbuf's */
 9121                 return;
 9122         }
 9123         SCTP_BUF_RESV_UF(cookie_ack, SCTP_MIN_OVERHEAD);
 9124         sctp_alloc_a_chunk(stcb, chk);
 9125         if (chk == NULL) {
 9126                 /* no memory */
 9127                 sctp_m_freem(cookie_ack);
 9128                 return;
 9129         }
 9130         chk->copy_by_ref = 0;
 9131         chk->rec.chunk_id.id = SCTP_COOKIE_ACK;
 9132         chk->rec.chunk_id.can_take_data = 1;
 9133         chk->flags = 0;
 9134         chk->send_size = sizeof(struct sctp_chunkhdr);
 9135         chk->sent = SCTP_DATAGRAM_UNSENT;
 9136         chk->snd_count = 0;
 9137         chk->asoc = &stcb->asoc;
 9138         chk->data = cookie_ack;
 9139         if (chk->asoc->last_control_chunk_from != NULL) {
 9140                 chk->whoTo = chk->asoc->last_control_chunk_from;
 9141                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9142         } else {
 9143                 chk->whoTo = NULL;
 9144         }
 9145         hdr = mtod(cookie_ack, struct sctp_chunkhdr *);
 9146         hdr->chunk_type = SCTP_COOKIE_ACK;
 9147         hdr->chunk_flags = 0;
 9148         hdr->chunk_length = htons(chk->send_size);
 9149         SCTP_BUF_LEN(cookie_ack) = chk->send_size;
 9150         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9151         chk->asoc->ctrl_queue_cnt++;
 9152         return;
 9153 }
 9154 
 9155 
 9156 void
 9157 sctp_send_shutdown_ack(struct sctp_tcb *stcb, struct sctp_nets *net)
 9158 {
 9159         /* formulate and queue a SHUTDOWN-ACK back to the sender */
 9160         struct mbuf *m_shutdown_ack;
 9161         struct sctp_shutdown_ack_chunk *ack_cp;
 9162         struct sctp_tmit_chunk *chk;
 9163 
 9164         m_shutdown_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_ack_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9165         if (m_shutdown_ack == NULL) {
 9166                 /* no mbuf's */
 9167                 return;
 9168         }
 9169         SCTP_BUF_RESV_UF(m_shutdown_ack, SCTP_MIN_OVERHEAD);
 9170         sctp_alloc_a_chunk(stcb, chk);
 9171         if (chk == NULL) {
 9172                 /* no memory */
 9173                 sctp_m_freem(m_shutdown_ack);
 9174                 return;
 9175         }
 9176         chk->copy_by_ref = 0;
 9177         chk->rec.chunk_id.id = SCTP_SHUTDOWN_ACK;
 9178         chk->rec.chunk_id.can_take_data = 1;
 9179         chk->flags = 0;
 9180         chk->send_size = sizeof(struct sctp_chunkhdr);
 9181         chk->sent = SCTP_DATAGRAM_UNSENT;
 9182         chk->snd_count = 0;
 9183         chk->flags = 0;
 9184         chk->asoc = &stcb->asoc;
 9185         chk->data = m_shutdown_ack;
 9186         chk->whoTo = net;
 9187         if (chk->whoTo) {
 9188                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9189         }
 9190         ack_cp = mtod(m_shutdown_ack, struct sctp_shutdown_ack_chunk *);
 9191         ack_cp->ch.chunk_type = SCTP_SHUTDOWN_ACK;
 9192         ack_cp->ch.chunk_flags = 0;
 9193         ack_cp->ch.chunk_length = htons(chk->send_size);
 9194         SCTP_BUF_LEN(m_shutdown_ack) = chk->send_size;
 9195         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9196         chk->asoc->ctrl_queue_cnt++;
 9197         return;
 9198 }
 9199 
 9200 void
 9201 sctp_send_shutdown(struct sctp_tcb *stcb, struct sctp_nets *net)
 9202 {
 9203         /* formulate and queue a SHUTDOWN to the sender */
 9204         struct mbuf *m_shutdown;
 9205         struct sctp_shutdown_chunk *shutdown_cp;
 9206         struct sctp_tmit_chunk *chk;
 9207 
 9208         m_shutdown = sctp_get_mbuf_for_msg(sizeof(struct sctp_shutdown_chunk), 0, M_NOWAIT, 1, MT_HEADER);
 9209         if (m_shutdown == NULL) {
 9210                 /* no mbuf's */
 9211                 return;
 9212         }
 9213         SCTP_BUF_RESV_UF(m_shutdown, SCTP_MIN_OVERHEAD);
 9214         sctp_alloc_a_chunk(stcb, chk);
 9215         if (chk == NULL) {
 9216                 /* no memory */
 9217                 sctp_m_freem(m_shutdown);
 9218                 return;
 9219         }
 9220         chk->copy_by_ref = 0;
 9221         chk->rec.chunk_id.id = SCTP_SHUTDOWN;
 9222         chk->rec.chunk_id.can_take_data = 1;
 9223         chk->flags = 0;
 9224         chk->send_size = sizeof(struct sctp_shutdown_chunk);
 9225         chk->sent = SCTP_DATAGRAM_UNSENT;
 9226         chk->snd_count = 0;
 9227         chk->flags = 0;
 9228         chk->asoc = &stcb->asoc;
 9229         chk->data = m_shutdown;
 9230         chk->whoTo = net;
 9231         if (chk->whoTo) {
 9232                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9233         }
 9234         shutdown_cp = mtod(m_shutdown, struct sctp_shutdown_chunk *);
 9235         shutdown_cp->ch.chunk_type = SCTP_SHUTDOWN;
 9236         shutdown_cp->ch.chunk_flags = 0;
 9237         shutdown_cp->ch.chunk_length = htons(chk->send_size);
 9238         shutdown_cp->cumulative_tsn_ack = htonl(stcb->asoc.cumulative_tsn);
 9239         SCTP_BUF_LEN(m_shutdown) = chk->send_size;
 9240         TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9241         chk->asoc->ctrl_queue_cnt++;
 9242         return;
 9243 }
 9244 
 9245 void
 9246 sctp_send_asconf(struct sctp_tcb *stcb, struct sctp_nets *net, int addr_locked)
 9247 {
 9248         /*
 9249          * formulate and queue an ASCONF to the peer. ASCONF parameters
 9250          * should be queued on the assoc queue.
 9251          */
 9252         struct sctp_tmit_chunk *chk;
 9253         struct mbuf *m_asconf;
 9254         int len;
 9255 
 9256         SCTP_TCB_LOCK_ASSERT(stcb);
 9257 
 9258         if ((!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) &&
 9259             (!sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_MULTIPLE_ASCONFS))) {
 9260                 /* can't send a new one if there is one in flight already */
 9261                 return;
 9262         }
 9263         /* compose an ASCONF chunk, maximum length is PMTU */
 9264         m_asconf = sctp_compose_asconf(stcb, &len, addr_locked);
 9265         if (m_asconf == NULL) {
 9266                 return;
 9267         }
 9268         sctp_alloc_a_chunk(stcb, chk);
 9269         if (chk == NULL) {
 9270                 /* no memory */
 9271                 sctp_m_freem(m_asconf);
 9272                 return;
 9273         }
 9274         chk->copy_by_ref = 0;
 9275         chk->rec.chunk_id.id = SCTP_ASCONF;
 9276         chk->rec.chunk_id.can_take_data = 0;
 9277         chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9278         chk->data = m_asconf;
 9279         chk->send_size = len;
 9280         chk->sent = SCTP_DATAGRAM_UNSENT;
 9281         chk->snd_count = 0;
 9282         chk->asoc = &stcb->asoc;
 9283         chk->whoTo = net;
 9284         if (chk->whoTo) {
 9285                 atomic_add_int(&chk->whoTo->ref_count, 1);
 9286         }
 9287         TAILQ_INSERT_TAIL(&chk->asoc->asconf_send_queue, chk, sctp_next);
 9288         chk->asoc->ctrl_queue_cnt++;
 9289         return;
 9290 }
 9291 
 9292 void
 9293 sctp_send_asconf_ack(struct sctp_tcb *stcb)
 9294 {
 9295         /*
 9296          * formulate and queue a asconf-ack back to sender. the asconf-ack
 9297          * must be stored in the tcb.
 9298          */
 9299         struct sctp_tmit_chunk *chk;
 9300         struct sctp_asconf_ack *ack, *latest_ack;
 9301         struct mbuf *m_ack;
 9302         struct sctp_nets *net = NULL;
 9303 
 9304         SCTP_TCB_LOCK_ASSERT(stcb);
 9305         /* Get the latest ASCONF-ACK */
 9306         latest_ack = TAILQ_LAST(&stcb->asoc.asconf_ack_sent, sctp_asconf_ackhead);
 9307         if (latest_ack == NULL) {
 9308                 return;
 9309         }
 9310         if (latest_ack->last_sent_to != NULL &&
 9311             latest_ack->last_sent_to == stcb->asoc.last_control_chunk_from) {
 9312                 /* we're doing a retransmission */
 9313                 net = sctp_find_alternate_net(stcb, stcb->asoc.last_control_chunk_from, 0);
 9314                 if (net == NULL) {
 9315                         /* no alternate */
 9316                         if (stcb->asoc.last_control_chunk_from == NULL) {
 9317                                 if (stcb->asoc.alternate) {
 9318                                         net = stcb->asoc.alternate;
 9319                                 } else {
 9320                                         net = stcb->asoc.primary_destination;
 9321                                 }
 9322                         } else {
 9323                                 net = stcb->asoc.last_control_chunk_from;
 9324                         }
 9325                 }
 9326         } else {
 9327                 /* normal case */
 9328                 if (stcb->asoc.last_control_chunk_from == NULL) {
 9329                         if (stcb->asoc.alternate) {
 9330                                 net = stcb->asoc.alternate;
 9331                         } else {
 9332                                 net = stcb->asoc.primary_destination;
 9333                         }
 9334                 } else {
 9335                         net = stcb->asoc.last_control_chunk_from;
 9336                 }
 9337         }
 9338         latest_ack->last_sent_to = net;
 9339 
 9340         TAILQ_FOREACH(ack, &stcb->asoc.asconf_ack_sent, next) {
 9341                 if (ack->data == NULL) {
 9342                         continue;
 9343                 }
 9344                 /* copy the asconf_ack */
 9345                 m_ack = SCTP_M_COPYM(ack->data, 0, M_COPYALL, M_NOWAIT);
 9346                 if (m_ack == NULL) {
 9347                         /* couldn't copy it */
 9348                         return;
 9349                 }
 9350 #ifdef SCTP_MBUF_LOGGING
 9351                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
 9352                         sctp_log_mbc(m_ack, SCTP_MBUF_ICOPY);
 9353                 }
 9354 #endif
 9355 
 9356                 sctp_alloc_a_chunk(stcb, chk);
 9357                 if (chk == NULL) {
 9358                         /* no memory */
 9359                         if (m_ack)
 9360                                 sctp_m_freem(m_ack);
 9361                         return;
 9362                 }
 9363                 chk->copy_by_ref = 0;
 9364                 chk->rec.chunk_id.id = SCTP_ASCONF_ACK;
 9365                 chk->rec.chunk_id.can_take_data = 1;
 9366                 chk->flags = CHUNK_FLAGS_FRAGMENT_OK;
 9367                 chk->whoTo = net;
 9368                 if (chk->whoTo) {
 9369                         atomic_add_int(&chk->whoTo->ref_count, 1);
 9370                 }
 9371                 chk->data = m_ack;
 9372                 chk->send_size = ack->len;
 9373                 chk->sent = SCTP_DATAGRAM_UNSENT;
 9374                 chk->snd_count = 0;
 9375                 chk->asoc = &stcb->asoc;
 9376 
 9377                 TAILQ_INSERT_TAIL(&chk->asoc->control_send_queue, chk, sctp_next);
 9378                 chk->asoc->ctrl_queue_cnt++;
 9379         }
 9380         return;
 9381 }
 9382 
 9383 
 9384 static int
 9385 sctp_chunk_retransmission(struct sctp_inpcb *inp,
 9386     struct sctp_tcb *stcb,
 9387     struct sctp_association *asoc,
 9388     int *cnt_out, struct timeval *now, int *now_filled, int *fr_done, int so_locked
 9389 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9390     SCTP_UNUSED
 9391 #endif
 9392 )
 9393 {
 9394         /*-
 9395          * send out one MTU of retransmission. If fast_retransmit is
 9396          * happening we ignore the cwnd. Otherwise we obey the cwnd and
 9397          * rwnd. For a Cookie or Asconf in the control chunk queue we
 9398          * retransmit them by themselves.
 9399          *
 9400          * For data chunks we will pick out the lowest TSN's in the sent_queue
 9401          * marked for resend and bundle them all together (up to a MTU of
 9402          * destination). The address to send to should have been
 9403          * selected/changed where the retransmission was marked (i.e. in FR
 9404          * or t3-timeout routines).
 9405          */
 9406         struct sctp_tmit_chunk *data_list[SCTP_MAX_DATA_BUNDLING];
 9407         struct sctp_tmit_chunk *chk, *fwd;
 9408         struct mbuf *m, *endofchain;
 9409         struct sctp_nets *net = NULL;
 9410         uint32_t tsns_sent = 0;
 9411         int no_fragmentflg, bundle_at, cnt_thru;
 9412         unsigned int mtu;
 9413         int error, i, one_chunk, fwd_tsn, ctl_cnt, tmr_started;
 9414         struct sctp_auth_chunk *auth = NULL;
 9415         uint32_t auth_offset = 0;
 9416         uint16_t auth_keyid;
 9417         int override_ok = 1;
 9418         int data_auth_reqd = 0;
 9419         uint32_t dmtu = 0;
 9420 
 9421         SCTP_TCB_LOCK_ASSERT(stcb);
 9422         tmr_started = ctl_cnt = bundle_at = error = 0;
 9423         no_fragmentflg = 1;
 9424         fwd_tsn = 0;
 9425         *cnt_out = 0;
 9426         fwd = NULL;
 9427         endofchain = m = NULL;
 9428         auth_keyid = stcb->asoc.authinfo.active_keyid;
 9429 #ifdef SCTP_AUDITING_ENABLED
 9430         sctp_audit_log(0xC3, 1);
 9431 #endif
 9432         if ((TAILQ_EMPTY(&asoc->sent_queue)) &&
 9433             (TAILQ_EMPTY(&asoc->control_send_queue))) {
 9434                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "SCTP hits empty queue with cnt set to %d?\n",
 9435                     asoc->sent_queue_retran_cnt);
 9436                 asoc->sent_queue_cnt = 0;
 9437                 asoc->sent_queue_cnt_removeable = 0;
 9438                 /* send back 0/0 so we enter normal transmission */
 9439                 *cnt_out = 0;
 9440                 return (0);
 9441         }
 9442         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
 9443                 if ((chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) ||
 9444                     (chk->rec.chunk_id.id == SCTP_STREAM_RESET) ||
 9445                     (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN)) {
 9446                         if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9447                                 continue;
 9448                         }
 9449                         if (chk->rec.chunk_id.id == SCTP_STREAM_RESET) {
 9450                                 if (chk != asoc->str_reset) {
 9451                                         /*
 9452                                          * not eligible for retran if its
 9453                                          * not ours
 9454                                          */
 9455                                         continue;
 9456                                 }
 9457                         }
 9458                         ctl_cnt++;
 9459                         if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
 9460                                 fwd_tsn = 1;
 9461                         }
 9462                         /*
 9463                          * Add an AUTH chunk, if chunk requires it save the
 9464                          * offset into the chain for AUTH
 9465                          */
 9466                         if ((auth == NULL) &&
 9467                             (sctp_auth_is_required_chunk(chk->rec.chunk_id.id,
 9468                             stcb->asoc.peer_auth_chunks))) {
 9469                                 m = sctp_add_auth_chunk(m, &endofchain,
 9470                                     &auth, &auth_offset,
 9471                                     stcb,
 9472                                     chk->rec.chunk_id.id);
 9473                                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9474                         }
 9475                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9476                         break;
 9477                 }
 9478         }
 9479         one_chunk = 0;
 9480         cnt_thru = 0;
 9481         /* do we have control chunks to retransmit? */
 9482         if (m != NULL) {
 9483                 /* Start a timer no matter if we suceed or fail */
 9484                 if (chk->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
 9485                         sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, inp, stcb, chk->whoTo);
 9486                 } else if (chk->rec.chunk_id.id == SCTP_ASCONF)
 9487                         sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp, stcb, chk->whoTo);
 9488                 chk->snd_count++;       /* update our count */
 9489                 if ((error = sctp_lowlevel_chunk_output(inp, stcb, chk->whoTo,
 9490                     (struct sockaddr *)&chk->whoTo->ro._l_addr, m,
 9491                     auth_offset, auth, stcb->asoc.authinfo.active_keyid,
 9492                     no_fragmentflg, 0, 0,
 9493                     inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9494                     chk->whoTo->port, NULL,
 9495                     0, 0,
 9496                     so_locked))) {
 9497                         SCTP_STAT_INCR(sctps_lowlevelerr);
 9498                         return (error);
 9499                 }
 9500                 endofchain = NULL;
 9501                 auth = NULL;
 9502                 auth_offset = 0;
 9503                 /*
 9504                  * We don't want to mark the net->sent time here since this
 9505                  * we use this for HB and retrans cannot measure RTT
 9506                  */
 9507                 /* (void)SCTP_GETTIME_TIMEVAL(&chk->whoTo->last_sent_time); */
 9508                 *cnt_out += 1;
 9509                 chk->sent = SCTP_DATAGRAM_SENT;
 9510                 sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
 9511                 if (fwd_tsn == 0) {
 9512                         return (0);
 9513                 } else {
 9514                         /* Clean up the fwd-tsn list */
 9515                         sctp_clean_up_ctl(stcb, asoc, so_locked);
 9516                         return (0);
 9517                 }
 9518         }
 9519         /*
 9520          * Ok, it is just data retransmission we need to do or that and a
 9521          * fwd-tsn with it all.
 9522          */
 9523         if (TAILQ_EMPTY(&asoc->sent_queue)) {
 9524                 return (SCTP_RETRAN_DONE);
 9525         }
 9526         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) ||
 9527             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT)) {
 9528                 /* not yet open, resend the cookie and that is it */
 9529                 return (1);
 9530         }
 9531 #ifdef SCTP_AUDITING_ENABLED
 9532         sctp_auditing(20, inp, stcb, NULL);
 9533 #endif
 9534         data_auth_reqd = sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks);
 9535         TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
 9536                 if (chk->sent != SCTP_DATAGRAM_RESEND) {
 9537                         /* No, not sent to this net or not ready for rtx */
 9538                         continue;
 9539                 }
 9540                 if (chk->data == NULL) {
 9541                         SCTP_PRINTF("TSN:%x chk->snd_count:%d chk->sent:%d can't retran - no data\n",
 9542                             chk->rec.data.TSN_seq, chk->snd_count, chk->sent);
 9543                         continue;
 9544                 }
 9545                 if ((SCTP_BASE_SYSCTL(sctp_max_retran_chunk)) &&
 9546                     (chk->snd_count >= SCTP_BASE_SYSCTL(sctp_max_retran_chunk))) {
 9547                         struct mbuf *op_err;
 9548                         char msg[SCTP_DIAG_INFO_LEN];
 9549 
 9550                         snprintf(msg, sizeof(msg), "TSN %8.8x retransmitted %d times, giving up",
 9551                             chk->rec.data.TSN_seq, chk->snd_count);
 9552                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
 9553                             msg);
 9554                         atomic_add_int(&stcb->asoc.refcnt, 1);
 9555                         sctp_abort_an_association(stcb->sctp_ep, stcb, op_err,
 9556                             so_locked);
 9557                         SCTP_TCB_LOCK(stcb);
 9558                         atomic_subtract_int(&stcb->asoc.refcnt, 1);
 9559                         return (SCTP_RETRAN_EXIT);
 9560                 }
 9561                 /* pick up the net */
 9562                 net = chk->whoTo;
 9563                 switch (net->ro._l_addr.sa.sa_family) {
 9564 #ifdef INET
 9565                 case AF_INET:
 9566                         mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
 9567                         break;
 9568 #endif
 9569 #ifdef INET6
 9570                 case AF_INET6:
 9571                         mtu = net->mtu - SCTP_MIN_OVERHEAD;
 9572                         break;
 9573 #endif
 9574                 default:
 9575                         /* TSNH */
 9576                         mtu = net->mtu;
 9577                         break;
 9578                 }
 9579 
 9580                 if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
 9581                         /* No room in peers rwnd */
 9582                         uint32_t tsn;
 9583 
 9584                         tsn = asoc->last_acked_seq + 1;
 9585                         if (tsn == chk->rec.data.TSN_seq) {
 9586                                 /*
 9587                                  * we make a special exception for this
 9588                                  * case. The peer has no rwnd but is missing
 9589                                  * the lowest chunk.. which is probably what
 9590                                  * is holding up the rwnd.
 9591                                  */
 9592                                 goto one_chunk_around;
 9593                         }
 9594                         return (1);
 9595                 }
 9596 one_chunk_around:
 9597                 if (asoc->peers_rwnd < mtu) {
 9598                         one_chunk = 1;
 9599                         if ((asoc->peers_rwnd == 0) &&
 9600                             (asoc->total_flight == 0)) {
 9601                                 chk->window_probe = 1;
 9602                                 chk->whoTo->window_probe = 1;
 9603                         }
 9604                 }
 9605 #ifdef SCTP_AUDITING_ENABLED
 9606                 sctp_audit_log(0xC3, 2);
 9607 #endif
 9608                 bundle_at = 0;
 9609                 m = NULL;
 9610                 net->fast_retran_ip = 0;
 9611                 if (chk->rec.data.doing_fast_retransmit == 0) {
 9612                         /*
 9613                          * if no FR in progress skip destination that have
 9614                          * flight_size > cwnd.
 9615                          */
 9616                         if (net->flight_size >= net->cwnd) {
 9617                                 continue;
 9618                         }
 9619                 } else {
 9620                         /*
 9621                          * Mark the destination net to have FR recovery
 9622                          * limits put on it.
 9623                          */
 9624                         *fr_done = 1;
 9625                         net->fast_retran_ip = 1;
 9626                 }
 9627 
 9628                 /*
 9629                  * if no AUTH is yet included and this chunk requires it,
 9630                  * make sure to account for it.  We don't apply the size
 9631                  * until the AUTH chunk is actually added below in case
 9632                  * there is no room for this chunk.
 9633                  */
 9634                 if (data_auth_reqd && (auth == NULL)) {
 9635                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9636                 } else
 9637                         dmtu = 0;
 9638 
 9639                 if ((chk->send_size <= (mtu - dmtu)) ||
 9640                     (chk->flags & CHUNK_FLAGS_FRAGMENT_OK)) {
 9641                         /* ok we will add this one */
 9642                         if (data_auth_reqd) {
 9643                                 if (auth == NULL) {
 9644                                         m = sctp_add_auth_chunk(m,
 9645                                             &endofchain,
 9646                                             &auth,
 9647                                             &auth_offset,
 9648                                             stcb,
 9649                                             SCTP_DATA);
 9650                                         auth_keyid = chk->auth_keyid;
 9651                                         override_ok = 0;
 9652                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9653                                 } else if (override_ok) {
 9654                                         auth_keyid = chk->auth_keyid;
 9655                                         override_ok = 0;
 9656                                 } else if (chk->auth_keyid != auth_keyid) {
 9657                                         /* different keyid, so done bundling */
 9658                                         break;
 9659                                 }
 9660                         }
 9661                         m = sctp_copy_mbufchain(chk->data, m, &endofchain, 0, chk->send_size, chk->copy_by_ref);
 9662                         if (m == NULL) {
 9663                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9664                                 return (ENOMEM);
 9665                         }
 9666                         /* Do clear IP_DF ? */
 9667                         if (chk->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9668                                 no_fragmentflg = 0;
 9669                         }
 9670                         /* upate our MTU size */
 9671                         if (mtu > (chk->send_size + dmtu))
 9672                                 mtu -= (chk->send_size + dmtu);
 9673                         else
 9674                                 mtu = 0;
 9675                         data_list[bundle_at++] = chk;
 9676                         if (one_chunk && (asoc->total_flight <= 0)) {
 9677                                 SCTP_STAT_INCR(sctps_windowprobed);
 9678                         }
 9679                 }
 9680                 if (one_chunk == 0) {
 9681                         /*
 9682                          * now are there anymore forward from chk to pick
 9683                          * up?
 9684                          */
 9685                         for (fwd = TAILQ_NEXT(chk, sctp_next); fwd != NULL; fwd = TAILQ_NEXT(fwd, sctp_next)) {
 9686                                 if (fwd->sent != SCTP_DATAGRAM_RESEND) {
 9687                                         /* Nope, not for retran */
 9688                                         continue;
 9689                                 }
 9690                                 if (fwd->whoTo != net) {
 9691                                         /* Nope, not the net in question */
 9692                                         continue;
 9693                                 }
 9694                                 if (data_auth_reqd && (auth == NULL)) {
 9695                                         dmtu = sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
 9696                                 } else
 9697                                         dmtu = 0;
 9698                                 if (fwd->send_size <= (mtu - dmtu)) {
 9699                                         if (data_auth_reqd) {
 9700                                                 if (auth == NULL) {
 9701                                                         m = sctp_add_auth_chunk(m,
 9702                                                             &endofchain,
 9703                                                             &auth,
 9704                                                             &auth_offset,
 9705                                                             stcb,
 9706                                                             SCTP_DATA);
 9707                                                         auth_keyid = fwd->auth_keyid;
 9708                                                         override_ok = 0;
 9709                                                         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
 9710                                                 } else if (override_ok) {
 9711                                                         auth_keyid = fwd->auth_keyid;
 9712                                                         override_ok = 0;
 9713                                                 } else if (fwd->auth_keyid != auth_keyid) {
 9714                                                         /*
 9715                                                          * different keyid,
 9716                                                          * so done bundling
 9717                                                          */
 9718                                                         break;
 9719                                                 }
 9720                                         }
 9721                                         m = sctp_copy_mbufchain(fwd->data, m, &endofchain, 0, fwd->send_size, fwd->copy_by_ref);
 9722                                         if (m == NULL) {
 9723                                                 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
 9724                                                 return (ENOMEM);
 9725                                         }
 9726                                         /* Do clear IP_DF ? */
 9727                                         if (fwd->flags & CHUNK_FLAGS_FRAGMENT_OK) {
 9728                                                 no_fragmentflg = 0;
 9729                                         }
 9730                                         /* upate our MTU size */
 9731                                         if (mtu > (fwd->send_size + dmtu))
 9732                                                 mtu -= (fwd->send_size + dmtu);
 9733                                         else
 9734                                                 mtu = 0;
 9735                                         data_list[bundle_at++] = fwd;
 9736                                         if (bundle_at >= SCTP_MAX_DATA_BUNDLING) {
 9737                                                 break;
 9738                                         }
 9739                                 } else {
 9740                                         /* can't fit so we are done */
 9741                                         break;
 9742                                 }
 9743                         }
 9744                 }
 9745                 /* Is there something to send for this destination? */
 9746                 if (m) {
 9747                         /*
 9748                          * No matter if we fail/or suceed we should start a
 9749                          * timer. A failure is like a lost IP packet :-)
 9750                          */
 9751                         if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9752                                 /*
 9753                                  * no timer running on this destination
 9754                                  * restart it.
 9755                                  */
 9756                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9757                                 tmr_started = 1;
 9758                         }
 9759                         /* Now lets send it, if there is anything to send :> */
 9760                         if ((error = sctp_lowlevel_chunk_output(inp, stcb, net,
 9761                             (struct sockaddr *)&net->ro._l_addr, m,
 9762                             auth_offset, auth, auth_keyid,
 9763                             no_fragmentflg, 0, 0,
 9764                             inp->sctp_lport, stcb->rport, htonl(stcb->asoc.peer_vtag),
 9765                             net->port, NULL,
 9766                             0, 0,
 9767                             so_locked))) {
 9768                                 /* error, we could not output */
 9769                                 SCTP_STAT_INCR(sctps_lowlevelerr);
 9770                                 return (error);
 9771                         }
 9772                         endofchain = NULL;
 9773                         auth = NULL;
 9774                         auth_offset = 0;
 9775                         /* For HB's */
 9776                         /*
 9777                          * We don't want to mark the net->sent time here
 9778                          * since this we use this for HB and retrans cannot
 9779                          * measure RTT
 9780                          */
 9781                         /* (void)SCTP_GETTIME_TIMEVAL(&net->last_sent_time); */
 9782 
 9783                         /* For auto-close */
 9784                         cnt_thru++;
 9785                         if (*now_filled == 0) {
 9786                                 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_last_sent);
 9787                                 *now = asoc->time_last_sent;
 9788                                 *now_filled = 1;
 9789                         } else {
 9790                                 asoc->time_last_sent = *now;
 9791                         }
 9792                         *cnt_out += bundle_at;
 9793 #ifdef SCTP_AUDITING_ENABLED
 9794                         sctp_audit_log(0xC4, bundle_at);
 9795 #endif
 9796                         if (bundle_at) {
 9797                                 tsns_sent = data_list[0]->rec.data.TSN_seq;
 9798                         }
 9799                         for (i = 0; i < bundle_at; i++) {
 9800                                 SCTP_STAT_INCR(sctps_sendretransdata);
 9801                                 data_list[i]->sent = SCTP_DATAGRAM_SENT;
 9802                                 /*
 9803                                  * When we have a revoked data, and we
 9804                                  * retransmit it, then we clear the revoked
 9805                                  * flag since this flag dictates if we
 9806                                  * subtracted from the fs
 9807                                  */
 9808                                 if (data_list[i]->rec.data.chunk_was_revoked) {
 9809                                         /* Deflate the cwnd */
 9810                                         data_list[i]->whoTo->cwnd -= data_list[i]->book_size;
 9811                                         data_list[i]->rec.data.chunk_was_revoked = 0;
 9812                                 }
 9813                                 data_list[i]->snd_count++;
 9814                                 sctp_ucount_decr(asoc->sent_queue_retran_cnt);
 9815                                 /* record the time */
 9816                                 data_list[i]->sent_rcv_time = asoc->time_last_sent;
 9817                                 if (data_list[i]->book_size_scale) {
 9818                                         /*
 9819                                          * need to double the book size on
 9820                                          * this one
 9821                                          */
 9822                                         data_list[i]->book_size_scale = 0;
 9823                                         /*
 9824                                          * Since we double the booksize, we
 9825                                          * must also double the output queue
 9826                                          * size, since this get shrunk when
 9827                                          * we free by this amount.
 9828                                          */
 9829                                         atomic_add_int(&((asoc)->total_output_queue_size), data_list[i]->book_size);
 9830                                         data_list[i]->book_size *= 2;
 9831 
 9832 
 9833                                 } else {
 9834                                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
 9835                                                 sctp_log_rwnd(SCTP_DECREASE_PEER_RWND,
 9836                                                     asoc->peers_rwnd, data_list[i]->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
 9837                                         }
 9838                                         asoc->peers_rwnd = sctp_sbspace_sub(asoc->peers_rwnd,
 9839                                             (uint32_t) (data_list[i]->send_size +
 9840                                             SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)));
 9841                                 }
 9842                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
 9843                                         sctp_misc_ints(SCTP_FLIGHT_LOG_UP_RSND,
 9844                                             data_list[i]->whoTo->flight_size,
 9845                                             data_list[i]->book_size,
 9846                                             (uintptr_t) data_list[i]->whoTo,
 9847                                             data_list[i]->rec.data.TSN_seq);
 9848                                 }
 9849                                 sctp_flight_size_increase(data_list[i]);
 9850                                 sctp_total_flight_increase(stcb, data_list[i]);
 9851                                 if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
 9852                                         /* SWS sender side engages */
 9853                                         asoc->peers_rwnd = 0;
 9854                                 }
 9855                                 if ((i == 0) &&
 9856                                     (data_list[i]->rec.data.doing_fast_retransmit)) {
 9857                                         SCTP_STAT_INCR(sctps_sendfastretrans);
 9858                                         if ((data_list[i] == TAILQ_FIRST(&asoc->sent_queue)) &&
 9859                                             (tmr_started == 0)) {
 9860                                                 /*-
 9861                                                  * ok we just fast-retrans'd
 9862                                                  * the lowest TSN, i.e the
 9863                                                  * first on the list. In
 9864                                                  * this case we want to give
 9865                                                  * some more time to get a
 9866                                                  * SACK back without a
 9867                                                  * t3-expiring.
 9868                                                  */
 9869                                                 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, inp, stcb, net,
 9870                                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_2);
 9871                                                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
 9872                                         }
 9873                                 }
 9874                         }
 9875                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
 9876                                 sctp_log_cwnd(stcb, net, tsns_sent, SCTP_CWND_LOG_FROM_RESEND);
 9877                         }
 9878 #ifdef SCTP_AUDITING_ENABLED
 9879                         sctp_auditing(21, inp, stcb, NULL);
 9880 #endif
 9881                 } else {
 9882                         /* None will fit */
 9883                         return (1);
 9884                 }
 9885                 if (asoc->sent_queue_retran_cnt <= 0) {
 9886                         /* all done we have no more to retran */
 9887                         asoc->sent_queue_retran_cnt = 0;
 9888                         break;
 9889                 }
 9890                 if (one_chunk) {
 9891                         /* No more room in rwnd */
 9892                         return (1);
 9893                 }
 9894                 /* stop the for loop here. we sent out a packet */
 9895                 break;
 9896         }
 9897         return (0);
 9898 }
 9899 
 9900 static void
 9901 sctp_timer_validation(struct sctp_inpcb *inp,
 9902     struct sctp_tcb *stcb,
 9903     struct sctp_association *asoc)
 9904 {
 9905         struct sctp_nets *net;
 9906 
 9907         /* Validate that a timer is running somewhere */
 9908         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
 9909                 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
 9910                         /* Here is a timer */
 9911                         return;
 9912                 }
 9913         }
 9914         SCTP_TCB_LOCK_ASSERT(stcb);
 9915         /* Gak, we did not have a timer somewhere */
 9916         SCTPDBG(SCTP_DEBUG_OUTPUT3, "Deadlock avoided starting timer on a dest at retran\n");
 9917         if (asoc->alternate) {
 9918                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->alternate);
 9919         } else {
 9920                 sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
 9921         }
 9922         return;
 9923 }
 9924 
 9925 void
 9926 sctp_chunk_output(struct sctp_inpcb *inp,
 9927     struct sctp_tcb *stcb,
 9928     int from_where,
 9929     int so_locked
 9930 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
 9931     SCTP_UNUSED
 9932 #endif
 9933 )
 9934 {
 9935         /*-
 9936          * Ok this is the generic chunk service queue. we must do the
 9937          * following:
 9938          * - See if there are retransmits pending, if so we must
 9939          *   do these first.
 9940          * - Service the stream queue that is next, moving any
 9941          *   message (note I must get a complete message i.e.
 9942          *   FIRST/MIDDLE and LAST to the out queue in one pass) and assigning
 9943          *   TSN's
 9944          * - Check to see if the cwnd/rwnd allows any output, if so we
 9945          *   go ahead and fomulate and send the low level chunks. Making sure
 9946          *   to combine any control in the control chunk queue also.
 9947          */
 9948         struct sctp_association *asoc;
 9949         struct sctp_nets *net;
 9950         int error = 0, num_out, tot_out = 0, ret = 0, reason_code;
 9951         unsigned int burst_cnt = 0;
 9952         struct timeval now;
 9953         int now_filled = 0;
 9954         int nagle_on;
 9955         int frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
 9956         int un_sent = 0;
 9957         int fr_done;
 9958         unsigned int tot_frs = 0;
 9959 
 9960         asoc = &stcb->asoc;
 9961 do_it_again:
 9962         /* The Nagle algorithm is only applied when handling a send call. */
 9963         if (from_where == SCTP_OUTPUT_FROM_USR_SEND) {
 9964                 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NODELAY)) {
 9965                         nagle_on = 0;
 9966                 } else {
 9967                         nagle_on = 1;
 9968                 }
 9969         } else {
 9970                 nagle_on = 0;
 9971         }
 9972         SCTP_TCB_LOCK_ASSERT(stcb);
 9973 
 9974         un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
 9975 
 9976         if ((un_sent <= 0) &&
 9977             (TAILQ_EMPTY(&asoc->control_send_queue)) &&
 9978             (TAILQ_EMPTY(&asoc->asconf_send_queue)) &&
 9979             (asoc->sent_queue_retran_cnt == 0) &&
 9980             (asoc->trigger_reset == 0)) {
 9981                 /* Nothing to do unless there is something to be sent left */
 9982                 return;
 9983         }
 9984         /*
 9985          * Do we have something to send, data or control AND a sack timer
 9986          * running, if so piggy-back the sack.
 9987          */
 9988         if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
 9989                 sctp_send_sack(stcb, so_locked);
 9990                 (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
 9991         }
 9992         while (asoc->sent_queue_retran_cnt) {
 9993                 /*-
 9994                  * Ok, it is retransmission time only, we send out only ONE
 9995                  * packet with a single call off to the retran code.
 9996                  */
 9997                 if (from_where == SCTP_OUTPUT_FROM_COOKIE_ACK) {
 9998                         /*-
 9999                          * Special hook for handling cookiess discarded
10000                          * by peer that carried data. Send cookie-ack only
10001                          * and then the next call with get the retran's.
10002                          */
10003                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10004                             from_where,
10005                             &now, &now_filled, frag_point, so_locked);
10006                         return;
10007                 } else if (from_where != SCTP_OUTPUT_FROM_HB_TMR) {
10008                         /* if its not from a HB then do it */
10009                         fr_done = 0;
10010                         ret = sctp_chunk_retransmission(inp, stcb, asoc, &num_out, &now, &now_filled, &fr_done, so_locked);
10011                         if (fr_done) {
10012                                 tot_frs++;
10013                         }
10014                 } else {
10015                         /*
10016                          * its from any other place, we don't allow retran
10017                          * output (only control)
10018                          */
10019                         ret = 1;
10020                 }
10021                 if (ret > 0) {
10022                         /* Can't send anymore */
10023                         /*-
10024                          * now lets push out control by calling med-level
10025                          * output once. this assures that we WILL send HB's
10026                          * if queued too.
10027                          */
10028                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1,
10029                             from_where,
10030                             &now, &now_filled, frag_point, so_locked);
10031 #ifdef SCTP_AUDITING_ENABLED
10032                         sctp_auditing(8, inp, stcb, NULL);
10033 #endif
10034                         sctp_timer_validation(inp, stcb, asoc);
10035                         return;
10036                 }
10037                 if (ret < 0) {
10038                         /*-
10039                          * The count was off.. retran is not happening so do
10040                          * the normal retransmission.
10041                          */
10042 #ifdef SCTP_AUDITING_ENABLED
10043                         sctp_auditing(9, inp, stcb, NULL);
10044 #endif
10045                         if (ret == SCTP_RETRAN_EXIT) {
10046                                 return;
10047                         }
10048                         break;
10049                 }
10050                 if (from_where == SCTP_OUTPUT_FROM_T3) {
10051                         /* Only one transmission allowed out of a timeout */
10052 #ifdef SCTP_AUDITING_ENABLED
10053                         sctp_auditing(10, inp, stcb, NULL);
10054 #endif
10055                         /* Push out any control */
10056                         (void)sctp_med_chunk_output(inp, stcb, asoc, &num_out, &reason_code, 1, from_where,
10057                             &now, &now_filled, frag_point, so_locked);
10058                         return;
10059                 }
10060                 if ((asoc->fr_max_burst > 0) && (tot_frs >= asoc->fr_max_burst)) {
10061                         /* Hit FR burst limit */
10062                         return;
10063                 }
10064                 if ((num_out == 0) && (ret == 0)) {
10065                         /* No more retrans to send */
10066                         break;
10067                 }
10068         }
10069 #ifdef SCTP_AUDITING_ENABLED
10070         sctp_auditing(12, inp, stcb, NULL);
10071 #endif
10072         /* Check for bad destinations, if they exist move chunks around. */
10073         TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
10074                 if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
10075                         /*-
10076                          * if possible move things off of this address we
10077                          * still may send below due to the dormant state but
10078                          * we try to find an alternate address to send to
10079                          * and if we have one we move all queued data on the
10080                          * out wheel to this alternate address.
10081                          */
10082                         if (net->ref_count > 1)
10083                                 sctp_move_chunks_from_net(stcb, net);
10084                 } else {
10085                         /*-
10086                          * if ((asoc->sat_network) || (net->addr_is_local))
10087                          * { burst_limit = asoc->max_burst *
10088                          * SCTP_SAT_NETWORK_BURST_INCR; }
10089                          */
10090                         if (asoc->max_burst > 0) {
10091                                 if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst)) {
10092                                         if ((net->flight_size + (asoc->max_burst * net->mtu)) < net->cwnd) {
10093                                                 /*
10094                                                  * JRS - Use the congestion
10095                                                  * control given in the
10096                                                  * congestion control module
10097                                                  */
10098                                                 asoc->cc_functions.sctp_cwnd_update_after_output(stcb, net, asoc->max_burst);
10099                                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10100                                                         sctp_log_maxburst(stcb, net, 0, asoc->max_burst, SCTP_MAX_BURST_APPLIED);
10101                                                 }
10102                                                 SCTP_STAT_INCR(sctps_maxburstqueued);
10103                                         }
10104                                         net->fast_retran_ip = 0;
10105                                 } else {
10106                                         if (net->flight_size == 0) {
10107                                                 /*
10108                                                  * Should be decaying the
10109                                                  * cwnd here
10110                                                  */
10111                                                 ;
10112                                         }
10113                                 }
10114                         }
10115                 }
10116 
10117         }
10118         burst_cnt = 0;
10119         do {
10120                 error = sctp_med_chunk_output(inp, stcb, asoc, &num_out,
10121                     &reason_code, 0, from_where,
10122                     &now, &now_filled, frag_point, so_locked);
10123                 if (error) {
10124                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Error %d was returned from med-c-op\n", error);
10125                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10126                                 sctp_log_maxburst(stcb, asoc->primary_destination, error, burst_cnt, SCTP_MAX_BURST_ERROR_STOP);
10127                         }
10128                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10129                                 sctp_log_cwnd(stcb, NULL, error, SCTP_SEND_NOW_COMPLETES);
10130                                 sctp_log_cwnd(stcb, NULL, 0xdeadbeef, SCTP_SEND_NOW_COMPLETES);
10131                         }
10132                         break;
10133                 }
10134                 SCTPDBG(SCTP_DEBUG_OUTPUT3, "m-c-o put out %d\n", num_out);
10135 
10136                 tot_out += num_out;
10137                 burst_cnt++;
10138                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10139                         sctp_log_cwnd(stcb, NULL, num_out, SCTP_SEND_NOW_COMPLETES);
10140                         if (num_out == 0) {
10141                                 sctp_log_cwnd(stcb, NULL, reason_code, SCTP_SEND_NOW_COMPLETES);
10142                         }
10143                 }
10144                 if (nagle_on) {
10145                         /*
10146                          * When the Nagle algorithm is used, look at how
10147                          * much is unsent, then if its smaller than an MTU
10148                          * and we have data in flight we stop, except if we
10149                          * are handling a fragmented user message.
10150                          */
10151                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
10152                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
10153                         if ((un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD)) &&
10154                             (stcb->asoc.total_flight > 0) &&
10155                             ((stcb->asoc.locked_on_sending == NULL) ||
10156                             sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR))) {
10157                                 break;
10158                         }
10159                 }
10160                 if (TAILQ_EMPTY(&asoc->control_send_queue) &&
10161                     TAILQ_EMPTY(&asoc->send_queue) &&
10162                     stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
10163                         /* Nothing left to send */
10164                         break;
10165                 }
10166                 if ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) <= 0) {
10167                         /* Nothing left to send */
10168                         break;
10169                 }
10170         } while (num_out &&
10171             ((asoc->max_burst == 0) ||
10172             SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) ||
10173             (burst_cnt < asoc->max_burst)));
10174 
10175         if (SCTP_BASE_SYSCTL(sctp_use_cwnd_based_maxburst) == 0) {
10176                 if ((asoc->max_burst > 0) && (burst_cnt >= asoc->max_burst)) {
10177                         SCTP_STAT_INCR(sctps_maxburstqueued);
10178                         asoc->burst_limit_applied = 1;
10179                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_MAXBURST_ENABLE) {
10180                                 sctp_log_maxburst(stcb, asoc->primary_destination, 0, burst_cnt, SCTP_MAX_BURST_APPLIED);
10181                         }
10182                 } else {
10183                         asoc->burst_limit_applied = 0;
10184                 }
10185         }
10186         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
10187                 sctp_log_cwnd(stcb, NULL, tot_out, SCTP_SEND_NOW_COMPLETES);
10188         }
10189         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Ok, we have put out %d chunks\n",
10190             tot_out);
10191 
10192         /*-
10193          * Now we need to clean up the control chunk chain if a ECNE is on
10194          * it. It must be marked as UNSENT again so next call will continue
10195          * to send it until such time that we get a CWR, to remove it.
10196          */
10197         if (stcb->asoc.ecn_echo_cnt_onq)
10198                 sctp_fix_ecn_echo(asoc);
10199 
10200         if (stcb->asoc.trigger_reset) {
10201                 if (sctp_send_stream_reset_out_if_possible(stcb, so_locked) == 0) {
10202                         goto do_it_again;
10203                 }
10204         }
10205         return;
10206 }
10207 
10208 
10209 int
10210 sctp_output(
10211     struct sctp_inpcb *inp,
10212     struct mbuf *m,
10213     struct sockaddr *addr,
10214     struct mbuf *control,
10215     struct thread *p,
10216     int flags)
10217 {
10218         if (inp == NULL) {
10219                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10220                 return (EINVAL);
10221         }
10222         if (inp->sctp_socket == NULL) {
10223                 SCTP_LTRACE_ERR_RET_PKT(m, inp, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
10224                 return (EINVAL);
10225         }
10226         return (sctp_sosend(inp->sctp_socket,
10227             addr,
10228             (struct uio *)NULL,
10229             m,
10230             control,
10231             flags, p
10232             ));
10233 }
10234 
10235 void
10236 send_forward_tsn(struct sctp_tcb *stcb,
10237     struct sctp_association *asoc)
10238 {
10239         struct sctp_tmit_chunk *chk;
10240         struct sctp_forward_tsn_chunk *fwdtsn;
10241         uint32_t advance_peer_ack_point;
10242 
10243         SCTP_TCB_LOCK_ASSERT(stcb);
10244         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10245                 if (chk->rec.chunk_id.id == SCTP_FORWARD_CUM_TSN) {
10246                         /* mark it to unsent */
10247                         chk->sent = SCTP_DATAGRAM_UNSENT;
10248                         chk->snd_count = 0;
10249                         /* Do we correct its output location? */
10250                         if (chk->whoTo) {
10251                                 sctp_free_remote_addr(chk->whoTo);
10252                                 chk->whoTo = NULL;
10253                         }
10254                         goto sctp_fill_in_rest;
10255                 }
10256         }
10257         /* Ok if we reach here we must build one */
10258         sctp_alloc_a_chunk(stcb, chk);
10259         if (chk == NULL) {
10260                 return;
10261         }
10262         asoc->fwd_tsn_cnt++;
10263         chk->copy_by_ref = 0;
10264         chk->rec.chunk_id.id = SCTP_FORWARD_CUM_TSN;
10265         chk->rec.chunk_id.can_take_data = 0;
10266         chk->flags = 0;
10267         chk->asoc = asoc;
10268         chk->whoTo = NULL;
10269         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
10270         if (chk->data == NULL) {
10271                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
10272                 return;
10273         }
10274         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
10275         chk->sent = SCTP_DATAGRAM_UNSENT;
10276         chk->snd_count = 0;
10277         TAILQ_INSERT_TAIL(&asoc->control_send_queue, chk, sctp_next);
10278         asoc->ctrl_queue_cnt++;
10279 sctp_fill_in_rest:
10280         /*-
10281          * Here we go through and fill out the part that deals with
10282          * stream/seq of the ones we skip.
10283          */
10284         SCTP_BUF_LEN(chk->data) = 0;
10285         {
10286                 struct sctp_tmit_chunk *at, *tp1, *last;
10287                 struct sctp_strseq *strseq;
10288                 unsigned int cnt_of_space, i, ovh;
10289                 unsigned int space_needed;
10290                 unsigned int cnt_of_skipped = 0;
10291 
10292                 TAILQ_FOREACH(at, &asoc->sent_queue, sctp_next) {
10293                         if ((at->sent != SCTP_FORWARD_TSN_SKIP) &&
10294                             (at->sent != SCTP_DATAGRAM_NR_ACKED)) {
10295                                 /* no more to look at */
10296                                 break;
10297                         }
10298                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10299                                 /* We don't report these */
10300                                 continue;
10301                         }
10302                         cnt_of_skipped++;
10303                 }
10304                 space_needed = (sizeof(struct sctp_forward_tsn_chunk) +
10305                     (cnt_of_skipped * sizeof(struct sctp_strseq)));
10306 
10307                 cnt_of_space = M_TRAILINGSPACE(chk->data);
10308 
10309                 if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
10310                         ovh = SCTP_MIN_OVERHEAD;
10311                 } else {
10312                         ovh = SCTP_MIN_V4_OVERHEAD;
10313                 }
10314                 if (cnt_of_space > (asoc->smallest_mtu - ovh)) {
10315                         /* trim to a mtu size */
10316                         cnt_of_space = asoc->smallest_mtu - ovh;
10317                 }
10318                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10319                         sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10320                             0xff, 0, cnt_of_skipped,
10321                             asoc->advanced_peer_ack_point);
10322 
10323                 }
10324                 advance_peer_ack_point = asoc->advanced_peer_ack_point;
10325                 if (cnt_of_space < space_needed) {
10326                         /*-
10327                          * ok we must trim down the chunk by lowering the
10328                          * advance peer ack point.
10329                          */
10330                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10331                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10332                                     0xff, 0xff, cnt_of_space,
10333                                     space_needed);
10334                         }
10335                         cnt_of_skipped = cnt_of_space - sizeof(struct sctp_forward_tsn_chunk);
10336                         cnt_of_skipped /= sizeof(struct sctp_strseq);
10337                         /*-
10338                          * Go through and find the TSN that will be the one
10339                          * we report.
10340                          */
10341                         at = TAILQ_FIRST(&asoc->sent_queue);
10342                         if (at != NULL) {
10343                                 for (i = 0; i < cnt_of_skipped; i++) {
10344                                         tp1 = TAILQ_NEXT(at, sctp_next);
10345                                         if (tp1 == NULL) {
10346                                                 break;
10347                                         }
10348                                         at = tp1;
10349                                 }
10350                         }
10351                         if (at && SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
10352                                 sctp_misc_ints(SCTP_FWD_TSN_CHECK,
10353                                     0xff, cnt_of_skipped, at->rec.data.TSN_seq,
10354                                     asoc->advanced_peer_ack_point);
10355                         }
10356                         last = at;
10357                         /*-
10358                          * last now points to last one I can report, update
10359                          * peer ack point
10360                          */
10361                         if (last)
10362                                 advance_peer_ack_point = last->rec.data.TSN_seq;
10363                         space_needed = sizeof(struct sctp_forward_tsn_chunk) +
10364                             cnt_of_skipped * sizeof(struct sctp_strseq);
10365                 }
10366                 chk->send_size = space_needed;
10367                 /* Setup the chunk */
10368                 fwdtsn = mtod(chk->data, struct sctp_forward_tsn_chunk *);
10369                 fwdtsn->ch.chunk_length = htons(chk->send_size);
10370                 fwdtsn->ch.chunk_flags = 0;
10371                 fwdtsn->ch.chunk_type = SCTP_FORWARD_CUM_TSN;
10372                 fwdtsn->new_cumulative_tsn = htonl(advance_peer_ack_point);
10373                 SCTP_BUF_LEN(chk->data) = chk->send_size;
10374                 fwdtsn++;
10375                 /*-
10376                  * Move pointer to after the fwdtsn and transfer to the
10377                  * strseq pointer.
10378                  */
10379                 strseq = (struct sctp_strseq *)fwdtsn;
10380                 /*-
10381                  * Now populate the strseq list. This is done blindly
10382                  * without pulling out duplicate stream info. This is
10383                  * inefficent but won't harm the process since the peer will
10384                  * look at these in sequence and will thus release anything.
10385                  * It could mean we exceed the PMTU and chop off some that
10386                  * we could have included.. but this is unlikely (aka 1432/4
10387                  * would mean 300+ stream seq's would have to be reported in
10388                  * one FWD-TSN. With a bit of work we can later FIX this to
10389                  * optimize and pull out duplcates.. but it does add more
10390                  * overhead. So for now... not!
10391                  */
10392                 at = TAILQ_FIRST(&asoc->sent_queue);
10393                 for (i = 0; i < cnt_of_skipped; i++) {
10394                         tp1 = TAILQ_NEXT(at, sctp_next);
10395                         if (tp1 == NULL)
10396                                 break;
10397                         if (at->rec.data.rcv_flags & SCTP_DATA_UNORDERED) {
10398                                 /* We don't report these */
10399                                 i--;
10400                                 at = tp1;
10401                                 continue;
10402                         }
10403                         if (at->rec.data.TSN_seq == advance_peer_ack_point) {
10404                                 at->rec.data.fwd_tsn_cnt = 0;
10405                         }
10406                         strseq->stream = ntohs(at->rec.data.stream_number);
10407                         strseq->sequence = ntohs(at->rec.data.stream_seq);
10408                         strseq++;
10409                         at = tp1;
10410                 }
10411         }
10412         return;
10413 }
10414 
10415 void
10416 sctp_send_sack(struct sctp_tcb *stcb, int so_locked
10417 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10418     SCTP_UNUSED
10419 #endif
10420 )
10421 {
10422         /*-
10423          * Queue up a SACK or NR-SACK in the control queue.
10424          * We must first check to see if a SACK or NR-SACK is
10425          * somehow on the control queue.
10426          * If so, we will take and and remove the old one.
10427          */
10428         struct sctp_association *asoc;
10429         struct sctp_tmit_chunk *chk, *a_chk;
10430         struct sctp_sack_chunk *sack;
10431         struct sctp_nr_sack_chunk *nr_sack;
10432         struct sctp_gap_ack_block *gap_descriptor;
10433         struct sack_track *selector;
10434         int mergeable = 0;
10435         int offset;
10436         caddr_t limit;
10437         uint32_t *dup;
10438         int limit_reached = 0;
10439         unsigned int i, siz, j;
10440         unsigned int num_gap_blocks = 0, num_nr_gap_blocks = 0, space;
10441         int num_dups = 0;
10442         int space_req;
10443         uint32_t highest_tsn;
10444         uint8_t flags;
10445         uint8_t type;
10446         uint8_t tsn_map;
10447 
10448         if (stcb->asoc.nrsack_supported == 1) {
10449                 type = SCTP_NR_SELECTIVE_ACK;
10450         } else {
10451                 type = SCTP_SELECTIVE_ACK;
10452         }
10453         a_chk = NULL;
10454         asoc = &stcb->asoc;
10455         SCTP_TCB_LOCK_ASSERT(stcb);
10456         if (asoc->last_data_chunk_from == NULL) {
10457                 /* Hmm we never received anything */
10458                 return;
10459         }
10460         sctp_slide_mapping_arrays(stcb);
10461         sctp_set_rwnd(stcb, asoc);
10462         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
10463                 if (chk->rec.chunk_id.id == type) {
10464                         /* Hmm, found a sack already on queue, remove it */
10465                         TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
10466                         asoc->ctrl_queue_cnt--;
10467                         a_chk = chk;
10468                         if (a_chk->data) {
10469                                 sctp_m_freem(a_chk->data);
10470                                 a_chk->data = NULL;
10471                         }
10472                         if (a_chk->whoTo) {
10473                                 sctp_free_remote_addr(a_chk->whoTo);
10474                                 a_chk->whoTo = NULL;
10475                         }
10476                         break;
10477                 }
10478         }
10479         if (a_chk == NULL) {
10480                 sctp_alloc_a_chunk(stcb, a_chk);
10481                 if (a_chk == NULL) {
10482                         /* No memory so we drop the idea, and set a timer */
10483                         if (stcb->asoc.delayed_ack) {
10484                                 sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10485                                     stcb->sctp_ep, stcb, NULL,
10486                                     SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_3);
10487                                 sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10488                                     stcb->sctp_ep, stcb, NULL);
10489                         } else {
10490                                 stcb->asoc.send_sack = 1;
10491                         }
10492                         return;
10493                 }
10494                 a_chk->copy_by_ref = 0;
10495                 a_chk->rec.chunk_id.id = type;
10496                 a_chk->rec.chunk_id.can_take_data = 1;
10497         }
10498         /* Clear our pkt counts */
10499         asoc->data_pkts_seen = 0;
10500 
10501         a_chk->flags = 0;
10502         a_chk->asoc = asoc;
10503         a_chk->snd_count = 0;
10504         a_chk->send_size = 0;   /* fill in later */
10505         a_chk->sent = SCTP_DATAGRAM_UNSENT;
10506         a_chk->whoTo = NULL;
10507 
10508         if (!(asoc->last_data_chunk_from->dest_state & SCTP_ADDR_REACHABLE)) {
10509                 /*-
10510                  * Ok, the destination for the SACK is unreachable, lets see if
10511                  * we can select an alternate to asoc->last_data_chunk_from
10512                  */
10513                 a_chk->whoTo = sctp_find_alternate_net(stcb, asoc->last_data_chunk_from, 0);
10514                 if (a_chk->whoTo == NULL) {
10515                         /* Nope, no alternate */
10516                         a_chk->whoTo = asoc->last_data_chunk_from;
10517                 }
10518         } else {
10519                 a_chk->whoTo = asoc->last_data_chunk_from;
10520         }
10521         if (a_chk->whoTo) {
10522                 atomic_add_int(&a_chk->whoTo->ref_count, 1);
10523         }
10524         if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->highest_tsn_inside_nr_map)) {
10525                 highest_tsn = asoc->highest_tsn_inside_map;
10526         } else {
10527                 highest_tsn = asoc->highest_tsn_inside_nr_map;
10528         }
10529         if (highest_tsn == asoc->cumulative_tsn) {
10530                 /* no gaps */
10531                 if (type == SCTP_SELECTIVE_ACK) {
10532                         space_req = sizeof(struct sctp_sack_chunk);
10533                 } else {
10534                         space_req = sizeof(struct sctp_nr_sack_chunk);
10535                 }
10536         } else {
10537                 /* gaps get a cluster */
10538                 space_req = MCLBYTES;
10539         }
10540         /* Ok now lets formulate a MBUF with our sack */
10541         a_chk->data = sctp_get_mbuf_for_msg(space_req, 0, M_NOWAIT, 1, MT_DATA);
10542         if ((a_chk->data == NULL) ||
10543             (a_chk->whoTo == NULL)) {
10544                 /* rats, no mbuf memory */
10545                 if (a_chk->data) {
10546                         /* was a problem with the destination */
10547                         sctp_m_freem(a_chk->data);
10548                         a_chk->data = NULL;
10549                 }
10550                 sctp_free_a_chunk(stcb, a_chk, so_locked);
10551                 /* sa_ignore NO_NULL_CHK */
10552                 if (stcb->asoc.delayed_ack) {
10553                         sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
10554                             stcb->sctp_ep, stcb, NULL,
10555                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_4);
10556                         sctp_timer_start(SCTP_TIMER_TYPE_RECV,
10557                             stcb->sctp_ep, stcb, NULL);
10558                 } else {
10559                         stcb->asoc.send_sack = 1;
10560                 }
10561                 return;
10562         }
10563         /* ok, lets go through and fill it in */
10564         SCTP_BUF_RESV_UF(a_chk->data, SCTP_MIN_OVERHEAD);
10565         space = M_TRAILINGSPACE(a_chk->data);
10566         if (space > (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD)) {
10567                 space = (a_chk->whoTo->mtu - SCTP_MIN_OVERHEAD);
10568         }
10569         limit = mtod(a_chk->data, caddr_t);
10570         limit += space;
10571 
10572         flags = 0;
10573 
10574         if ((asoc->sctp_cmt_on_off > 0) &&
10575             SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
10576                 /*-
10577                  * CMT DAC algorithm: If 2 (i.e., 0x10) packets have been
10578                  * received, then set high bit to 1, else 0. Reset
10579                  * pkts_rcvd.
10580                  */
10581                 flags |= (asoc->cmt_dac_pkts_rcvd << 6);
10582                 asoc->cmt_dac_pkts_rcvd = 0;
10583         }
10584 #ifdef SCTP_ASOCLOG_OF_TSNS
10585         stcb->asoc.cumack_logsnt[stcb->asoc.cumack_log_atsnt] = asoc->cumulative_tsn;
10586         stcb->asoc.cumack_log_atsnt++;
10587         if (stcb->asoc.cumack_log_atsnt >= SCTP_TSN_LOG_SIZE) {
10588                 stcb->asoc.cumack_log_atsnt = 0;
10589         }
10590 #endif
10591         /* reset the readers interpretation */
10592         stcb->freed_by_sorcv_sincelast = 0;
10593 
10594         if (type == SCTP_SELECTIVE_ACK) {
10595                 sack = mtod(a_chk->data, struct sctp_sack_chunk *);
10596                 nr_sack = NULL;
10597                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)sack + sizeof(struct sctp_sack_chunk));
10598                 if (highest_tsn > asoc->mapping_array_base_tsn) {
10599                         siz = (((highest_tsn - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10600                 } else {
10601                         siz = (((MAX_TSN - highest_tsn) + 1) + highest_tsn + 7) / 8;
10602                 }
10603         } else {
10604                 sack = NULL;
10605                 nr_sack = mtod(a_chk->data, struct sctp_nr_sack_chunk *);
10606                 gap_descriptor = (struct sctp_gap_ack_block *)((caddr_t)nr_sack + sizeof(struct sctp_nr_sack_chunk));
10607                 if (asoc->highest_tsn_inside_map > asoc->mapping_array_base_tsn) {
10608                         siz = (((asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10609                 } else {
10610                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_map + 7) / 8;
10611                 }
10612         }
10613 
10614         if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10615                 offset = 1;
10616         } else {
10617                 offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10618         }
10619         if (((type == SCTP_SELECTIVE_ACK) &&
10620             SCTP_TSN_GT(highest_tsn, asoc->cumulative_tsn)) ||
10621             ((type == SCTP_NR_SELECTIVE_ACK) &&
10622             SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn))) {
10623                 /* we have a gap .. maybe */
10624                 for (i = 0; i < siz; i++) {
10625                         tsn_map = asoc->mapping_array[i];
10626                         if (type == SCTP_SELECTIVE_ACK) {
10627                                 tsn_map |= asoc->nr_mapping_array[i];
10628                         }
10629                         if (i == 0) {
10630                                 /*
10631                                  * Clear all bits corresponding to TSNs
10632                                  * smaller or equal to the cumulative TSN.
10633                                  */
10634                                 tsn_map &= (~0U << (1 - offset));
10635                         }
10636                         selector = &sack_array[tsn_map];
10637                         if (mergeable && selector->right_edge) {
10638                                 /*
10639                                  * Backup, left and right edges were ok to
10640                                  * merge.
10641                                  */
10642                                 num_gap_blocks--;
10643                                 gap_descriptor--;
10644                         }
10645                         if (selector->num_entries == 0)
10646                                 mergeable = 0;
10647                         else {
10648                                 for (j = 0; j < selector->num_entries; j++) {
10649                                         if (mergeable && selector->right_edge) {
10650                                                 /*
10651                                                  * do a merge by NOT setting
10652                                                  * the left side
10653                                                  */
10654                                                 mergeable = 0;
10655                                         } else {
10656                                                 /*
10657                                                  * no merge, set the left
10658                                                  * side
10659                                                  */
10660                                                 mergeable = 0;
10661                                                 gap_descriptor->start = htons((selector->gaps[j].start + offset));
10662                                         }
10663                                         gap_descriptor->end = htons((selector->gaps[j].end + offset));
10664                                         num_gap_blocks++;
10665                                         gap_descriptor++;
10666                                         if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10667                                                 /* no more room */
10668                                                 limit_reached = 1;
10669                                                 break;
10670                                         }
10671                                 }
10672                                 if (selector->left_edge) {
10673                                         mergeable = 1;
10674                                 }
10675                         }
10676                         if (limit_reached) {
10677                                 /* Reached the limit stop */
10678                                 break;
10679                         }
10680                         offset += 8;
10681                 }
10682         }
10683         if ((type == SCTP_NR_SELECTIVE_ACK) &&
10684             (limit_reached == 0)) {
10685 
10686                 mergeable = 0;
10687 
10688                 if (asoc->highest_tsn_inside_nr_map > asoc->mapping_array_base_tsn) {
10689                         siz = (((asoc->highest_tsn_inside_nr_map - asoc->mapping_array_base_tsn) + 1) + 7) / 8;
10690                 } else {
10691                         siz = (((MAX_TSN - asoc->mapping_array_base_tsn) + 1) + asoc->highest_tsn_inside_nr_map + 7) / 8;
10692                 }
10693 
10694                 if (SCTP_TSN_GT(asoc->mapping_array_base_tsn, asoc->cumulative_tsn)) {
10695                         offset = 1;
10696                 } else {
10697                         offset = asoc->mapping_array_base_tsn - asoc->cumulative_tsn;
10698                 }
10699                 if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) {
10700                         /* we have a gap .. maybe */
10701                         for (i = 0; i < siz; i++) {
10702                                 tsn_map = asoc->nr_mapping_array[i];
10703                                 if (i == 0) {
10704                                         /*
10705                                          * Clear all bits corresponding to
10706                                          * TSNs smaller or equal to the
10707                                          * cumulative TSN.
10708                                          */
10709                                         tsn_map &= (~0U << (1 - offset));
10710                                 }
10711                                 selector = &sack_array[tsn_map];
10712                                 if (mergeable && selector->right_edge) {
10713                                         /*
10714                                          * Backup, left and right edges were
10715                                          * ok to merge.
10716                                          */
10717                                         num_nr_gap_blocks--;
10718                                         gap_descriptor--;
10719                                 }
10720                                 if (selector->num_entries == 0)
10721                                         mergeable = 0;
10722                                 else {
10723                                         for (j = 0; j < selector->num_entries; j++) {
10724                                                 if (mergeable && selector->right_edge) {
10725                                                         /*
10726                                                          * do a merge by NOT
10727                                                          * setting the left
10728                                                          * side
10729                                                          */
10730                                                         mergeable = 0;
10731                                                 } else {
10732                                                         /*
10733                                                          * no merge, set the
10734                                                          * left side
10735                                                          */
10736                                                         mergeable = 0;
10737                                                         gap_descriptor->start = htons((selector->gaps[j].start + offset));
10738                                                 }
10739                                                 gap_descriptor->end = htons((selector->gaps[j].end + offset));
10740                                                 num_nr_gap_blocks++;
10741                                                 gap_descriptor++;
10742                                                 if (((caddr_t)gap_descriptor + sizeof(struct sctp_gap_ack_block)) > limit) {
10743                                                         /* no more room */
10744                                                         limit_reached = 1;
10745                                                         break;
10746                                                 }
10747                                         }
10748                                         if (selector->left_edge) {
10749                                                 mergeable = 1;
10750                                         }
10751                                 }
10752                                 if (limit_reached) {
10753                                         /* Reached the limit stop */
10754                                         break;
10755                                 }
10756                                 offset += 8;
10757                         }
10758                 }
10759         }
10760         /* now we must add any dups we are going to report. */
10761         if ((limit_reached == 0) && (asoc->numduptsns)) {
10762                 dup = (uint32_t *) gap_descriptor;
10763                 for (i = 0; i < asoc->numduptsns; i++) {
10764                         *dup = htonl(asoc->dup_tsns[i]);
10765                         dup++;
10766                         num_dups++;
10767                         if (((caddr_t)dup + sizeof(uint32_t)) > limit) {
10768                                 /* no more room */
10769                                 break;
10770                         }
10771                 }
10772                 asoc->numduptsns = 0;
10773         }
10774         /*
10775          * now that the chunk is prepared queue it to the control chunk
10776          * queue.
10777          */
10778         if (type == SCTP_SELECTIVE_ACK) {
10779                 a_chk->send_size = sizeof(struct sctp_sack_chunk) +
10780                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10781                     num_dups * sizeof(int32_t);
10782                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10783                 sack->sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10784                 sack->sack.a_rwnd = htonl(asoc->my_rwnd);
10785                 sack->sack.num_gap_ack_blks = htons(num_gap_blocks);
10786                 sack->sack.num_dup_tsns = htons(num_dups);
10787                 sack->ch.chunk_type = type;
10788                 sack->ch.chunk_flags = flags;
10789                 sack->ch.chunk_length = htons(a_chk->send_size);
10790         } else {
10791                 a_chk->send_size = sizeof(struct sctp_nr_sack_chunk) +
10792                     (num_gap_blocks + num_nr_gap_blocks) * sizeof(struct sctp_gap_ack_block) +
10793                     num_dups * sizeof(int32_t);
10794                 SCTP_BUF_LEN(a_chk->data) = a_chk->send_size;
10795                 nr_sack->nr_sack.cum_tsn_ack = htonl(asoc->cumulative_tsn);
10796                 nr_sack->nr_sack.a_rwnd = htonl(asoc->my_rwnd);
10797                 nr_sack->nr_sack.num_gap_ack_blks = htons(num_gap_blocks);
10798                 nr_sack->nr_sack.num_nr_gap_ack_blks = htons(num_nr_gap_blocks);
10799                 nr_sack->nr_sack.num_dup_tsns = htons(num_dups);
10800                 nr_sack->nr_sack.reserved = 0;
10801                 nr_sack->ch.chunk_type = type;
10802                 nr_sack->ch.chunk_flags = flags;
10803                 nr_sack->ch.chunk_length = htons(a_chk->send_size);
10804         }
10805         TAILQ_INSERT_TAIL(&asoc->control_send_queue, a_chk, sctp_next);
10806         asoc->my_last_reported_rwnd = asoc->my_rwnd;
10807         asoc->ctrl_queue_cnt++;
10808         asoc->send_sack = 0;
10809         SCTP_STAT_INCR(sctps_sendsacks);
10810         return;
10811 }
10812 
10813 void
10814 sctp_send_abort_tcb(struct sctp_tcb *stcb, struct mbuf *operr, int so_locked
10815 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
10816     SCTP_UNUSED
10817 #endif
10818 )
10819 {
10820         struct mbuf *m_abort, *m, *m_last;
10821         struct mbuf *m_out, *m_end = NULL;
10822         struct sctp_abort_chunk *abort;
10823         struct sctp_auth_chunk *auth = NULL;
10824         struct sctp_nets *net;
10825         uint32_t vtag;
10826         uint32_t auth_offset = 0;
10827         uint16_t cause_len, chunk_len, padding_len;
10828 
10829         SCTP_TCB_LOCK_ASSERT(stcb);
10830         /*-
10831          * Add an AUTH chunk, if chunk requires it and save the offset into
10832          * the chain for AUTH
10833          */
10834         if (sctp_auth_is_required_chunk(SCTP_ABORT_ASSOCIATION,
10835             stcb->asoc.peer_auth_chunks)) {
10836                 m_out = sctp_add_auth_chunk(NULL, &m_end, &auth, &auth_offset,
10837                     stcb, SCTP_ABORT_ASSOCIATION);
10838                 SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10839         } else {
10840                 m_out = NULL;
10841         }
10842         m_abort = sctp_get_mbuf_for_msg(sizeof(struct sctp_abort_chunk), 0, M_NOWAIT, 1, MT_HEADER);
10843         if (m_abort == NULL) {
10844                 if (m_out) {
10845                         sctp_m_freem(m_out);
10846                 }
10847                 if (operr) {
10848                         sctp_m_freem(operr);
10849                 }
10850                 return;
10851         }
10852         /* link in any error */
10853         SCTP_BUF_NEXT(m_abort) = operr;
10854         cause_len = 0;
10855         m_last = NULL;
10856         for (m = operr; m; m = SCTP_BUF_NEXT(m)) {
10857                 cause_len += (uint16_t) SCTP_BUF_LEN(m);
10858                 if (SCTP_BUF_NEXT(m) == NULL) {
10859                         m_last = m;
10860                 }
10861         }
10862         SCTP_BUF_LEN(m_abort) = sizeof(struct sctp_abort_chunk);
10863         chunk_len = (uint16_t) sizeof(struct sctp_abort_chunk) + cause_len;
10864         padding_len = SCTP_SIZE32(chunk_len) - chunk_len;
10865         if (m_out == NULL) {
10866                 /* NO Auth chunk prepended, so reserve space in front */
10867                 SCTP_BUF_RESV_UF(m_abort, SCTP_MIN_OVERHEAD);
10868                 m_out = m_abort;
10869         } else {
10870                 /* Put AUTH chunk at the front of the chain */
10871                 SCTP_BUF_NEXT(m_end) = m_abort;
10872         }
10873         if (stcb->asoc.alternate) {
10874                 net = stcb->asoc.alternate;
10875         } else {
10876                 net = stcb->asoc.primary_destination;
10877         }
10878         /* Fill in the ABORT chunk header. */
10879         abort = mtod(m_abort, struct sctp_abort_chunk *);
10880         abort->ch.chunk_type = SCTP_ABORT_ASSOCIATION;
10881         if (stcb->asoc.peer_vtag == 0) {
10882                 /* This happens iff the assoc is in COOKIE-WAIT state. */
10883                 vtag = stcb->asoc.my_vtag;
10884                 abort->ch.chunk_flags = SCTP_HAD_NO_TCB;
10885         } else {
10886                 vtag = stcb->asoc.peer_vtag;
10887                 abort->ch.chunk_flags = 0;
10888         }
10889         abort->ch.chunk_length = htons(chunk_len);
10890         /* Add padding, if necessary. */
10891         if (padding_len > 0) {
10892                 if ((m_last == NULL) ||
10893                     (sctp_add_pad_tombuf(m_last, padding_len) == NULL)) {
10894                         sctp_m_freem(m_out);
10895                         return;
10896                 }
10897         }
10898         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10899             (struct sockaddr *)&net->ro._l_addr,
10900             m_out, auth_offset, auth, stcb->asoc.authinfo.active_keyid, 1, 0, 0,
10901             stcb->sctp_ep->sctp_lport, stcb->rport, htonl(vtag),
10902             stcb->asoc.primary_destination->port, NULL,
10903             0, 0,
10904             so_locked);
10905         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10906 }
10907 
10908 void
10909 sctp_send_shutdown_complete(struct sctp_tcb *stcb,
10910     struct sctp_nets *net,
10911     int reflect_vtag)
10912 {
10913         /* formulate and SEND a SHUTDOWN-COMPLETE */
10914         struct mbuf *m_shutdown_comp;
10915         struct sctp_shutdown_complete_chunk *shutdown_complete;
10916         uint32_t vtag;
10917         uint8_t flags;
10918 
10919         m_shutdown_comp = sctp_get_mbuf_for_msg(sizeof(struct sctp_chunkhdr), 0, M_NOWAIT, 1, MT_HEADER);
10920         if (m_shutdown_comp == NULL) {
10921                 /* no mbuf's */
10922                 return;
10923         }
10924         if (reflect_vtag) {
10925                 flags = SCTP_HAD_NO_TCB;
10926                 vtag = stcb->asoc.my_vtag;
10927         } else {
10928                 flags = 0;
10929                 vtag = stcb->asoc.peer_vtag;
10930         }
10931         shutdown_complete = mtod(m_shutdown_comp, struct sctp_shutdown_complete_chunk *);
10932         shutdown_complete->ch.chunk_type = SCTP_SHUTDOWN_COMPLETE;
10933         shutdown_complete->ch.chunk_flags = flags;
10934         shutdown_complete->ch.chunk_length = htons(sizeof(struct sctp_shutdown_complete_chunk));
10935         SCTP_BUF_LEN(m_shutdown_comp) = sizeof(struct sctp_shutdown_complete_chunk);
10936         (void)sctp_lowlevel_chunk_output(stcb->sctp_ep, stcb, net,
10937             (struct sockaddr *)&net->ro._l_addr,
10938             m_shutdown_comp, 0, NULL, 0, 1, 0, 0,
10939             stcb->sctp_ep->sctp_lport, stcb->rport,
10940             htonl(vtag),
10941             net->port, NULL,
10942             0, 0,
10943             SCTP_SO_NOT_LOCKED);
10944         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
10945         return;
10946 }
10947 
10948 static void
10949 sctp_send_resp_msg(struct sockaddr *src, struct sockaddr *dst,
10950     struct sctphdr *sh, uint32_t vtag,
10951     uint8_t type, struct mbuf *cause,
10952     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
10953     uint32_t vrf_id, uint16_t port)
10954 {
10955         struct mbuf *o_pak;
10956         struct mbuf *mout;
10957         struct sctphdr *shout;
10958         struct sctp_chunkhdr *ch;
10959 
10960 #if defined(INET) || defined(INET6)
10961         struct udphdr *udp;
10962         int ret;
10963 
10964 #endif
10965         int len, cause_len, padding_len;
10966 
10967 #ifdef INET
10968         struct sockaddr_in *src_sin, *dst_sin;
10969         struct ip *ip;
10970 
10971 #endif
10972 #ifdef INET6
10973         struct sockaddr_in6 *src_sin6, *dst_sin6;
10974         struct ip6_hdr *ip6;
10975 
10976 #endif
10977 
10978         /* Compute the length of the cause and add final padding. */
10979         cause_len = 0;
10980         if (cause != NULL) {
10981                 struct mbuf *m_at, *m_last = NULL;
10982 
10983                 for (m_at = cause; m_at; m_at = SCTP_BUF_NEXT(m_at)) {
10984                         if (SCTP_BUF_NEXT(m_at) == NULL)
10985                                 m_last = m_at;
10986                         cause_len += SCTP_BUF_LEN(m_at);
10987                 }
10988                 padding_len = cause_len % 4;
10989                 if (padding_len != 0) {
10990                         padding_len = 4 - padding_len;
10991                 }
10992                 if (padding_len != 0) {
10993                         if (sctp_add_pad_tombuf(m_last, padding_len) == NULL) {
10994                                 sctp_m_freem(cause);
10995                                 return;
10996                         }
10997                 }
10998         } else {
10999                 padding_len = 0;
11000         }
11001         /* Get an mbuf for the header. */
11002         len = sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
11003         switch (dst->sa_family) {
11004 #ifdef INET
11005         case AF_INET:
11006                 len += sizeof(struct ip);
11007                 break;
11008 #endif
11009 #ifdef INET6
11010         case AF_INET6:
11011                 len += sizeof(struct ip6_hdr);
11012                 break;
11013 #endif
11014         default:
11015                 break;
11016         }
11017 #if defined(INET) || defined(INET6)
11018         if (port) {
11019                 len += sizeof(struct udphdr);
11020         }
11021 #endif
11022         mout = sctp_get_mbuf_for_msg(len + max_linkhdr, 1, M_NOWAIT, 1, MT_DATA);
11023         if (mout == NULL) {
11024                 if (cause) {
11025                         sctp_m_freem(cause);
11026                 }
11027                 return;
11028         }
11029         SCTP_BUF_RESV_UF(mout, max_linkhdr);
11030         SCTP_BUF_LEN(mout) = len;
11031         SCTP_BUF_NEXT(mout) = cause;
11032         M_SETFIB(mout, fibnum);
11033         mout->m_pkthdr.flowid = mflowid;
11034         M_HASHTYPE_SET(mout, mflowtype);
11035 #ifdef INET
11036         ip = NULL;
11037 #endif
11038 #ifdef INET6
11039         ip6 = NULL;
11040 #endif
11041         switch (dst->sa_family) {
11042 #ifdef INET
11043         case AF_INET:
11044                 src_sin = (struct sockaddr_in *)src;
11045                 dst_sin = (struct sockaddr_in *)dst;
11046                 ip = mtod(mout, struct ip *);
11047                 ip->ip_v = IPVERSION;
11048                 ip->ip_hl = (sizeof(struct ip) >> 2);
11049                 ip->ip_tos = 0;
11050                 ip->ip_id = ip_newid();
11051                 ip->ip_off = 0;
11052                 ip->ip_ttl = MODULE_GLOBAL(ip_defttl);
11053                 if (port) {
11054                         ip->ip_p = IPPROTO_UDP;
11055                 } else {
11056                         ip->ip_p = IPPROTO_SCTP;
11057                 }
11058                 ip->ip_src.s_addr = dst_sin->sin_addr.s_addr;
11059                 ip->ip_dst.s_addr = src_sin->sin_addr.s_addr;
11060                 ip->ip_sum = 0;
11061                 len = sizeof(struct ip);
11062                 shout = (struct sctphdr *)((caddr_t)ip + len);
11063                 break;
11064 #endif
11065 #ifdef INET6
11066         case AF_INET6:
11067                 src_sin6 = (struct sockaddr_in6 *)src;
11068                 dst_sin6 = (struct sockaddr_in6 *)dst;
11069                 ip6 = mtod(mout, struct ip6_hdr *);
11070                 ip6->ip6_flow = htonl(0x60000000);
11071                 if (V_ip6_auto_flowlabel) {
11072                         ip6->ip6_flow |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
11073                 }
11074                 ip6->ip6_hlim = MODULE_GLOBAL(ip6_defhlim);
11075                 if (port) {
11076                         ip6->ip6_nxt = IPPROTO_UDP;
11077                 } else {
11078                         ip6->ip6_nxt = IPPROTO_SCTP;
11079                 }
11080                 ip6->ip6_src = dst_sin6->sin6_addr;
11081                 ip6->ip6_dst = src_sin6->sin6_addr;
11082                 len = sizeof(struct ip6_hdr);
11083                 shout = (struct sctphdr *)((caddr_t)ip6 + len);
11084                 break;
11085 #endif
11086         default:
11087                 len = 0;
11088                 shout = mtod(mout, struct sctphdr *);
11089                 break;
11090         }
11091 #if defined(INET) || defined(INET6)
11092         if (port) {
11093                 if (htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port)) == 0) {
11094                         sctp_m_freem(mout);
11095                         return;
11096                 }
11097                 udp = (struct udphdr *)shout;
11098                 udp->uh_sport = htons(SCTP_BASE_SYSCTL(sctp_udp_tunneling_port));
11099                 udp->uh_dport = port;
11100                 udp->uh_sum = 0;
11101                 udp->uh_ulen = htons(sizeof(struct udphdr) +
11102                     sizeof(struct sctphdr) +
11103                     sizeof(struct sctp_chunkhdr) +
11104                     cause_len + padding_len);
11105                 len += sizeof(struct udphdr);
11106                 shout = (struct sctphdr *)((caddr_t)shout + sizeof(struct udphdr));
11107         } else {
11108                 udp = NULL;
11109         }
11110 #endif
11111         shout->src_port = sh->dest_port;
11112         shout->dest_port = sh->src_port;
11113         shout->checksum = 0;
11114         if (vtag) {
11115                 shout->v_tag = htonl(vtag);
11116         } else {
11117                 shout->v_tag = sh->v_tag;
11118         }
11119         len += sizeof(struct sctphdr);
11120         ch = (struct sctp_chunkhdr *)((caddr_t)shout + sizeof(struct sctphdr));
11121         ch->chunk_type = type;
11122         if (vtag) {
11123                 ch->chunk_flags = 0;
11124         } else {
11125                 ch->chunk_flags = SCTP_HAD_NO_TCB;
11126         }
11127         ch->chunk_length = htons(sizeof(struct sctp_chunkhdr) + cause_len);
11128         len += sizeof(struct sctp_chunkhdr);
11129         len += cause_len + padding_len;
11130 
11131         if (SCTP_GET_HEADER_FOR_OUTPUT(o_pak)) {
11132                 sctp_m_freem(mout);
11133                 return;
11134         }
11135         SCTP_ATTACH_CHAIN(o_pak, mout, len);
11136         switch (dst->sa_family) {
11137 #ifdef INET
11138         case AF_INET:
11139                 if (port) {
11140                         if (V_udp_cksum) {
11141                                 udp->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, udp->uh_ulen + htons(IPPROTO_UDP));
11142                         } else {
11143                                 udp->uh_sum = 0;
11144                         }
11145                 }
11146                 ip->ip_len = htons(len);
11147                 if (port) {
11148 #if defined(SCTP_WITH_NO_CSUM)
11149                         SCTP_STAT_INCR(sctps_sendnocrc);
11150 #else
11151                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip) + sizeof(struct udphdr));
11152                         SCTP_STAT_INCR(sctps_sendswcrc);
11153 #endif
11154                         if (V_udp_cksum) {
11155                                 SCTP_ENABLE_UDP_CSUM(o_pak);
11156                         }
11157                 } else {
11158 #if defined(SCTP_WITH_NO_CSUM)
11159                         SCTP_STAT_INCR(sctps_sendnocrc);
11160 #else
11161                         mout->m_pkthdr.csum_flags = CSUM_SCTP;
11162                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11163                         SCTP_STAT_INCR(sctps_sendhwcrc);
11164 #endif
11165                 }
11166 #ifdef SCTP_PACKET_LOGGING
11167                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11168                         sctp_packet_log(o_pak);
11169                 }
11170 #endif
11171                 SCTP_IP_OUTPUT(ret, o_pak, NULL, NULL, vrf_id);
11172                 break;
11173 #endif
11174 #ifdef INET6
11175         case AF_INET6:
11176                 ip6->ip6_plen = len - sizeof(struct ip6_hdr);
11177                 if (port) {
11178 #if defined(SCTP_WITH_NO_CSUM)
11179                         SCTP_STAT_INCR(sctps_sendnocrc);
11180 #else
11181                         shout->checksum = sctp_calculate_cksum(mout, sizeof(struct ip6_hdr) + sizeof(struct udphdr));
11182                         SCTP_STAT_INCR(sctps_sendswcrc);
11183 #endif
11184                         if ((udp->uh_sum = in6_cksum(o_pak, IPPROTO_UDP, sizeof(struct ip6_hdr), len - sizeof(struct ip6_hdr))) == 0) {
11185                                 udp->uh_sum = 0xffff;
11186                         }
11187                 } else {
11188 #if defined(SCTP_WITH_NO_CSUM)
11189                         SCTP_STAT_INCR(sctps_sendnocrc);
11190 #else
11191                         mout->m_pkthdr.csum_flags = CSUM_SCTP_IPV6;
11192                         mout->m_pkthdr.csum_data = offsetof(struct sctphdr, checksum);
11193                         SCTP_STAT_INCR(sctps_sendhwcrc);
11194 #endif
11195                 }
11196 #ifdef SCTP_PACKET_LOGGING
11197                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
11198                         sctp_packet_log(o_pak);
11199                 }
11200 #endif
11201                 SCTP_IP6_OUTPUT(ret, o_pak, NULL, NULL, NULL, vrf_id);
11202                 break;
11203 #endif
11204         default:
11205                 SCTPDBG(SCTP_DEBUG_OUTPUT1, "Unknown protocol (TSNH) type %d\n",
11206                     dst->sa_family);
11207                 sctp_m_freem(mout);
11208                 SCTP_LTRACE_ERR_RET_PKT(mout, NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EFAULT);
11209                 return;
11210         }
11211         SCTP_STAT_INCR(sctps_sendpackets);
11212         SCTP_STAT_INCR_COUNTER64(sctps_outpackets);
11213         SCTP_STAT_INCR_COUNTER64(sctps_outcontrolchunks);
11214         return;
11215 }
11216 
11217 void
11218 sctp_send_shutdown_complete2(struct sockaddr *src, struct sockaddr *dst,
11219     struct sctphdr *sh,
11220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
11221     uint32_t vrf_id, uint16_t port)
11222 {
11223         sctp_send_resp_msg(src, dst, sh, 0, SCTP_SHUTDOWN_COMPLETE, NULL,
11224             mflowtype, mflowid, fibnum,
11225             vrf_id, port);
11226 }
11227 
11228 void
11229 sctp_send_hb(struct sctp_tcb *stcb, struct sctp_nets *net, int so_locked
11230 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
11231     SCTP_UNUSED
11232 #endif
11233 )
11234 {
11235         struct sctp_tmit_chunk *chk;
11236         struct sctp_heartbeat_chunk *hb;
11237         struct timeval now;
11238 
11239         SCTP_TCB_LOCK_ASSERT(stcb);
11240         if (net == NULL) {
11241                 return;
11242         }
11243         (void)SCTP_GETTIME_TIMEVAL(&now);
11244         switch (net->ro._l_addr.sa.sa_family) {
11245 #ifdef INET
11246         case AF_INET:
11247                 break;
11248 #endif
11249 #ifdef INET6
11250         case AF_INET6:
11251                 break;
11252 #endif
11253         default:
11254                 return;
11255         }
11256         sctp_alloc_a_chunk(stcb, chk);
11257         if (chk == NULL) {
11258                 SCTPDBG(SCTP_DEBUG_OUTPUT4, "Gak, can't get a chunk for hb\n");
11259                 return;
11260         }
11261         chk->copy_by_ref = 0;
11262         chk->rec.chunk_id.id = SCTP_HEARTBEAT_REQUEST;
11263         chk->rec.chunk_id.can_take_data = 1;
11264         chk->flags = 0;
11265         chk->asoc = &stcb->asoc;
11266         chk->send_size = sizeof(struct sctp_heartbeat_chunk);
11267 
11268         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11269         if (chk->data == NULL) {
11270                 sctp_free_a_chunk(stcb, chk, so_locked);
11271                 return;
11272         }
11273         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11274         SCTP_BUF_LEN(chk->data) = chk->send_size;
11275         chk->sent = SCTP_DATAGRAM_UNSENT;
11276         chk->snd_count = 0;
11277         chk->whoTo = net;
11278         atomic_add_int(&chk->whoTo->ref_count, 1);
11279         /* Now we have a mbuf that we can fill in with the details */
11280         hb = mtod(chk->data, struct sctp_heartbeat_chunk *);
11281         memset(hb, 0, sizeof(struct sctp_heartbeat_chunk));
11282         /* fill out chunk header */
11283         hb->ch.chunk_type = SCTP_HEARTBEAT_REQUEST;
11284         hb->ch.chunk_flags = 0;
11285         hb->ch.chunk_length = htons(chk->send_size);
11286         /* Fill out hb parameter */
11287         hb->heartbeat.hb_info.ph.param_type = htons(SCTP_HEARTBEAT_INFO);
11288         hb->heartbeat.hb_info.ph.param_length = htons(sizeof(struct sctp_heartbeat_info_param));
11289         hb->heartbeat.hb_info.time_value_1 = now.tv_sec;
11290         hb->heartbeat.hb_info.time_value_2 = now.tv_usec;
11291         /* Did our user request this one, put it in */
11292         hb->heartbeat.hb_info.addr_family = (uint8_t) net->ro._l_addr.sa.sa_family;
11293         hb->heartbeat.hb_info.addr_len = net->ro._l_addr.sa.sa_len;
11294         if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
11295                 /*
11296                  * we only take from the entropy pool if the address is not
11297                  * confirmed.
11298                  */
11299                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11300                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
11301         } else {
11302                 net->heartbeat_random1 = hb->heartbeat.hb_info.random_value1 = 0;
11303                 net->heartbeat_random2 = hb->heartbeat.hb_info.random_value2 = 0;
11304         }
11305         switch (net->ro._l_addr.sa.sa_family) {
11306 #ifdef INET
11307         case AF_INET:
11308                 memcpy(hb->heartbeat.hb_info.address,
11309                     &net->ro._l_addr.sin.sin_addr,
11310                     sizeof(net->ro._l_addr.sin.sin_addr));
11311                 break;
11312 #endif
11313 #ifdef INET6
11314         case AF_INET6:
11315                 memcpy(hb->heartbeat.hb_info.address,
11316                     &net->ro._l_addr.sin6.sin6_addr,
11317                     sizeof(net->ro._l_addr.sin6.sin6_addr));
11318                 break;
11319 #endif
11320         default:
11321                 if (chk->data) {
11322                         sctp_m_freem(chk->data);
11323                         chk->data = NULL;
11324                 }
11325                 sctp_free_a_chunk(stcb, chk, so_locked);
11326                 return;
11327                 break;
11328         }
11329         net->hb_responded = 0;
11330         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11331         stcb->asoc.ctrl_queue_cnt++;
11332         SCTP_STAT_INCR(sctps_sendheartbeat);
11333         return;
11334 }
11335 
11336 void
11337 sctp_send_ecn_echo(struct sctp_tcb *stcb, struct sctp_nets *net,
11338     uint32_t high_tsn)
11339 {
11340         struct sctp_association *asoc;
11341         struct sctp_ecne_chunk *ecne;
11342         struct sctp_tmit_chunk *chk;
11343 
11344         if (net == NULL) {
11345                 return;
11346         }
11347         asoc = &stcb->asoc;
11348         SCTP_TCB_LOCK_ASSERT(stcb);
11349         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11350                 if ((chk->rec.chunk_id.id == SCTP_ECN_ECHO) && (net == chk->whoTo)) {
11351                         /* found a previous ECN_ECHO update it if needed */
11352                         uint32_t cnt, ctsn;
11353 
11354                         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11355                         ctsn = ntohl(ecne->tsn);
11356                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11357                                 ecne->tsn = htonl(high_tsn);
11358                                 SCTP_STAT_INCR(sctps_queue_upd_ecne);
11359                         }
11360                         cnt = ntohl(ecne->num_pkts_since_cwr);
11361                         cnt++;
11362                         ecne->num_pkts_since_cwr = htonl(cnt);
11363                         return;
11364                 }
11365         }
11366         /* nope could not find one to update so we must build one */
11367         sctp_alloc_a_chunk(stcb, chk);
11368         if (chk == NULL) {
11369                 return;
11370         }
11371         SCTP_STAT_INCR(sctps_queue_upd_ecne);
11372         chk->copy_by_ref = 0;
11373         chk->rec.chunk_id.id = SCTP_ECN_ECHO;
11374         chk->rec.chunk_id.can_take_data = 0;
11375         chk->flags = 0;
11376         chk->asoc = &stcb->asoc;
11377         chk->send_size = sizeof(struct sctp_ecne_chunk);
11378         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11379         if (chk->data == NULL) {
11380                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11381                 return;
11382         }
11383         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11384         SCTP_BUF_LEN(chk->data) = chk->send_size;
11385         chk->sent = SCTP_DATAGRAM_UNSENT;
11386         chk->snd_count = 0;
11387         chk->whoTo = net;
11388         atomic_add_int(&chk->whoTo->ref_count, 1);
11389 
11390         stcb->asoc.ecn_echo_cnt_onq++;
11391         ecne = mtod(chk->data, struct sctp_ecne_chunk *);
11392         ecne->ch.chunk_type = SCTP_ECN_ECHO;
11393         ecne->ch.chunk_flags = 0;
11394         ecne->ch.chunk_length = htons(sizeof(struct sctp_ecne_chunk));
11395         ecne->tsn = htonl(high_tsn);
11396         ecne->num_pkts_since_cwr = htonl(1);
11397         TAILQ_INSERT_HEAD(&stcb->asoc.control_send_queue, chk, sctp_next);
11398         asoc->ctrl_queue_cnt++;
11399 }
11400 
11401 void
11402 sctp_send_packet_dropped(struct sctp_tcb *stcb, struct sctp_nets *net,
11403     struct mbuf *m, int len, int iphlen, int bad_crc)
11404 {
11405         struct sctp_association *asoc;
11406         struct sctp_pktdrop_chunk *drp;
11407         struct sctp_tmit_chunk *chk;
11408         uint8_t *datap;
11409         int was_trunc = 0;
11410         int fullsz = 0;
11411         long spc;
11412         int offset;
11413         struct sctp_chunkhdr *ch, chunk_buf;
11414         unsigned int chk_length;
11415 
11416         if (!stcb) {
11417                 return;
11418         }
11419         asoc = &stcb->asoc;
11420         SCTP_TCB_LOCK_ASSERT(stcb);
11421         if (asoc->pktdrop_supported == 0) {
11422                 /*-
11423                  * peer must declare support before I send one.
11424                  */
11425                 return;
11426         }
11427         if (stcb->sctp_socket == NULL) {
11428                 return;
11429         }
11430         sctp_alloc_a_chunk(stcb, chk);
11431         if (chk == NULL) {
11432                 return;
11433         }
11434         chk->copy_by_ref = 0;
11435         chk->rec.chunk_id.id = SCTP_PACKET_DROPPED;
11436         chk->rec.chunk_id.can_take_data = 1;
11437         chk->flags = 0;
11438         len -= iphlen;
11439         chk->send_size = len;
11440         /* Validate that we do not have an ABORT in here. */
11441         offset = iphlen + sizeof(struct sctphdr);
11442         ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11443             sizeof(*ch), (uint8_t *) & chunk_buf);
11444         while (ch != NULL) {
11445                 chk_length = ntohs(ch->chunk_length);
11446                 if (chk_length < sizeof(*ch)) {
11447                         /* break to abort land */
11448                         break;
11449                 }
11450                 switch (ch->chunk_type) {
11451                 case SCTP_PACKET_DROPPED:
11452                 case SCTP_ABORT_ASSOCIATION:
11453                 case SCTP_INITIATION_ACK:
11454                         /**
11455                          * We don't respond with an PKT-DROP to an ABORT
11456                          * or PKT-DROP. We also do not respond to an
11457                          * INIT-ACK, because we can't know if the initiation
11458                          * tag is correct or not.
11459                          */
11460                         sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11461                         return;
11462                 default:
11463                         break;
11464                 }
11465                 offset += SCTP_SIZE32(chk_length);
11466                 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
11467                     sizeof(*ch), (uint8_t *) & chunk_buf);
11468         }
11469 
11470         if ((len + SCTP_MAX_OVERHEAD + sizeof(struct sctp_pktdrop_chunk)) >
11471             min(stcb->asoc.smallest_mtu, MCLBYTES)) {
11472                 /*
11473                  * only send 1 mtu worth, trim off the excess on the end.
11474                  */
11475                 fullsz = len;
11476                 len = min(stcb->asoc.smallest_mtu, MCLBYTES) - SCTP_MAX_OVERHEAD;
11477                 was_trunc = 1;
11478         }
11479         chk->asoc = &stcb->asoc;
11480         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11481         if (chk->data == NULL) {
11482 jump_out:
11483                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11484                 return;
11485         }
11486         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11487         drp = mtod(chk->data, struct sctp_pktdrop_chunk *);
11488         if (drp == NULL) {
11489                 sctp_m_freem(chk->data);
11490                 chk->data = NULL;
11491                 goto jump_out;
11492         }
11493         chk->book_size = SCTP_SIZE32((chk->send_size + sizeof(struct sctp_pktdrop_chunk) +
11494             sizeof(struct sctphdr) + SCTP_MED_OVERHEAD));
11495         chk->book_size_scale = 0;
11496         if (was_trunc) {
11497                 drp->ch.chunk_flags = SCTP_PACKET_TRUNCATED;
11498                 drp->trunc_len = htons(fullsz);
11499                 /*
11500                  * Len is already adjusted to size minus overhead above take
11501                  * out the pkt_drop chunk itself from it.
11502                  */
11503                 chk->send_size = len - sizeof(struct sctp_pktdrop_chunk);
11504                 len = chk->send_size;
11505         } else {
11506                 /* no truncation needed */
11507                 drp->ch.chunk_flags = 0;
11508                 drp->trunc_len = htons(0);
11509         }
11510         if (bad_crc) {
11511                 drp->ch.chunk_flags |= SCTP_BADCRC;
11512         }
11513         chk->send_size += sizeof(struct sctp_pktdrop_chunk);
11514         SCTP_BUF_LEN(chk->data) = chk->send_size;
11515         chk->sent = SCTP_DATAGRAM_UNSENT;
11516         chk->snd_count = 0;
11517         if (net) {
11518                 /* we should hit here */
11519                 chk->whoTo = net;
11520                 atomic_add_int(&chk->whoTo->ref_count, 1);
11521         } else {
11522                 chk->whoTo = NULL;
11523         }
11524         drp->ch.chunk_type = SCTP_PACKET_DROPPED;
11525         drp->ch.chunk_length = htons(chk->send_size);
11526         spc = SCTP_SB_LIMIT_RCV(stcb->sctp_socket);
11527         if (spc < 0) {
11528                 spc = 0;
11529         }
11530         drp->bottle_bw = htonl(spc);
11531         if (asoc->my_rwnd) {
11532                 drp->current_onq = htonl(asoc->size_on_reasm_queue +
11533                     asoc->size_on_all_streams +
11534                     asoc->my_rwnd_control_len +
11535                     stcb->sctp_socket->so_rcv.sb_cc);
11536         } else {
11537                 /*-
11538                  * If my rwnd is 0, possibly from mbuf depletion as well as
11539                  * space used, tell the peer there is NO space aka onq == bw
11540                  */
11541                 drp->current_onq = htonl(spc);
11542         }
11543         drp->reserved = 0;
11544         datap = drp->data;
11545         m_copydata(m, iphlen, len, (caddr_t)datap);
11546         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11547         asoc->ctrl_queue_cnt++;
11548 }
11549 
11550 void
11551 sctp_send_cwr(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t high_tsn, uint8_t override)
11552 {
11553         struct sctp_association *asoc;
11554         struct sctp_cwr_chunk *cwr;
11555         struct sctp_tmit_chunk *chk;
11556 
11557         SCTP_TCB_LOCK_ASSERT(stcb);
11558         if (net == NULL) {
11559                 return;
11560         }
11561         asoc = &stcb->asoc;
11562         TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
11563                 if ((chk->rec.chunk_id.id == SCTP_ECN_CWR) && (net == chk->whoTo)) {
11564                         /*
11565                          * found a previous CWR queued to same destination
11566                          * update it if needed
11567                          */
11568                         uint32_t ctsn;
11569 
11570                         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11571                         ctsn = ntohl(cwr->tsn);
11572                         if (SCTP_TSN_GT(high_tsn, ctsn)) {
11573                                 cwr->tsn = htonl(high_tsn);
11574                         }
11575                         if (override & SCTP_CWR_REDUCE_OVERRIDE) {
11576                                 /* Make sure override is carried */
11577                                 cwr->ch.chunk_flags |= SCTP_CWR_REDUCE_OVERRIDE;
11578                         }
11579                         return;
11580                 }
11581         }
11582         sctp_alloc_a_chunk(stcb, chk);
11583         if (chk == NULL) {
11584                 return;
11585         }
11586         chk->copy_by_ref = 0;
11587         chk->rec.chunk_id.id = SCTP_ECN_CWR;
11588         chk->rec.chunk_id.can_take_data = 1;
11589         chk->flags = 0;
11590         chk->asoc = &stcb->asoc;
11591         chk->send_size = sizeof(struct sctp_cwr_chunk);
11592         chk->data = sctp_get_mbuf_for_msg(chk->send_size, 0, M_NOWAIT, 1, MT_HEADER);
11593         if (chk->data == NULL) {
11594                 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
11595                 return;
11596         }
11597         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11598         SCTP_BUF_LEN(chk->data) = chk->send_size;
11599         chk->sent = SCTP_DATAGRAM_UNSENT;
11600         chk->snd_count = 0;
11601         chk->whoTo = net;
11602         atomic_add_int(&chk->whoTo->ref_count, 1);
11603         cwr = mtod(chk->data, struct sctp_cwr_chunk *);
11604         cwr->ch.chunk_type = SCTP_ECN_CWR;
11605         cwr->ch.chunk_flags = override;
11606         cwr->ch.chunk_length = htons(sizeof(struct sctp_cwr_chunk));
11607         cwr->tsn = htonl(high_tsn);
11608         TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, chk, sctp_next);
11609         asoc->ctrl_queue_cnt++;
11610 }
11611 
11612 static int
11613 sctp_add_stream_reset_out(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
11614     uint32_t seq, uint32_t resp_seq, uint32_t last_sent)
11615 {
11616         uint16_t len, old_len, i;
11617         struct sctp_stream_reset_out_request *req_out;
11618         struct sctp_chunkhdr *ch;
11619         int at;
11620         int number_entries = 0;
11621 
11622         ch = mtod(chk->data, struct sctp_chunkhdr *);
11623         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11624         /* get to new offset for the param. */
11625         req_out = (struct sctp_stream_reset_out_request *)((caddr_t)ch + len);
11626         /* now how long will this param be? */
11627         for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11628                 if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11629                     (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11630                     TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11631                         number_entries++;
11632                 }
11633         }
11634         if (number_entries == 0) {
11635                 return (0);
11636         }
11637         if (number_entries == stcb->asoc.streamoutcnt) {
11638                 number_entries = 0;
11639         }
11640         if (number_entries > SCTP_MAX_STREAMS_AT_ONCE_RESET) {
11641                 number_entries = SCTP_MAX_STREAMS_AT_ONCE_RESET;
11642         }
11643         len = (sizeof(struct sctp_stream_reset_out_request) + (sizeof(uint16_t) * number_entries));
11644         req_out->ph.param_type = htons(SCTP_STR_RESET_OUT_REQUEST);
11645         req_out->ph.param_length = htons(len);
11646         req_out->request_seq = htonl(seq);
11647         req_out->response_seq = htonl(resp_seq);
11648         req_out->send_reset_at_tsn = htonl(last_sent);
11649         at = 0;
11650         if (number_entries) {
11651                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11652                         if ((stcb->asoc.strmout[i].state == SCTP_STREAM_RESET_PENDING) &&
11653                             (stcb->asoc.strmout[i].chunks_on_queues == 0) &&
11654                             TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
11655                                 req_out->list_of_streams[at] = htons(i);
11656                                 at++;
11657                                 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11658                                 if (at >= number_entries) {
11659                                         break;
11660                                 }
11661                         }
11662                 }
11663         } else {
11664                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
11665                         stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_IN_FLIGHT;
11666                 }
11667         }
11668         if (SCTP_SIZE32(len) > len) {
11669                 /*-
11670                  * Need to worry about the pad we may end up adding to the
11671                  * end. This is easy since the struct is either aligned to 4
11672                  * bytes or 2 bytes off.
11673                  */
11674                 req_out->list_of_streams[number_entries] = 0;
11675         }
11676         /* now fix the chunk length */
11677         ch->chunk_length = htons(len + old_len);
11678         chk->book_size = len + old_len;
11679         chk->book_size_scale = 0;
11680         chk->send_size = SCTP_SIZE32(chk->book_size);
11681         SCTP_BUF_LEN(chk->data) = chk->send_size;
11682         return (1);
11683 }
11684 
11685 static void
11686 sctp_add_stream_reset_in(struct sctp_tmit_chunk *chk,
11687     int number_entries, uint16_t * list,
11688     uint32_t seq)
11689 {
11690         uint16_t len, old_len, i;
11691         struct sctp_stream_reset_in_request *req_in;
11692         struct sctp_chunkhdr *ch;
11693 
11694         ch = mtod(chk->data, struct sctp_chunkhdr *);
11695         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11696 
11697         /* get to new offset for the param. */
11698         req_in = (struct sctp_stream_reset_in_request *)((caddr_t)ch + len);
11699         /* now how long will this param be? */
11700         len = (sizeof(struct sctp_stream_reset_in_request) + (sizeof(uint16_t) * number_entries));
11701         req_in->ph.param_type = htons(SCTP_STR_RESET_IN_REQUEST);
11702         req_in->ph.param_length = htons(len);
11703         req_in->request_seq = htonl(seq);
11704         if (number_entries) {
11705                 for (i = 0; i < number_entries; i++) {
11706                         req_in->list_of_streams[i] = htons(list[i]);
11707                 }
11708         }
11709         if (SCTP_SIZE32(len) > len) {
11710                 /*-
11711                  * Need to worry about the pad we may end up adding to the
11712                  * end. This is easy since the struct is either aligned to 4
11713                  * bytes or 2 bytes off.
11714                  */
11715                 req_in->list_of_streams[number_entries] = 0;
11716         }
11717         /* now fix the chunk length */
11718         ch->chunk_length = htons(len + old_len);
11719         chk->book_size = len + old_len;
11720         chk->book_size_scale = 0;
11721         chk->send_size = SCTP_SIZE32(chk->book_size);
11722         SCTP_BUF_LEN(chk->data) = chk->send_size;
11723         return;
11724 }
11725 
11726 static void
11727 sctp_add_stream_reset_tsn(struct sctp_tmit_chunk *chk,
11728     uint32_t seq)
11729 {
11730         uint16_t len, old_len;
11731         struct sctp_stream_reset_tsn_request *req_tsn;
11732         struct sctp_chunkhdr *ch;
11733 
11734         ch = mtod(chk->data, struct sctp_chunkhdr *);
11735         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11736 
11737         /* get to new offset for the param. */
11738         req_tsn = (struct sctp_stream_reset_tsn_request *)((caddr_t)ch + len);
11739         /* now how long will this param be? */
11740         len = sizeof(struct sctp_stream_reset_tsn_request);
11741         req_tsn->ph.param_type = htons(SCTP_STR_RESET_TSN_REQUEST);
11742         req_tsn->ph.param_length = htons(len);
11743         req_tsn->request_seq = htonl(seq);
11744 
11745         /* now fix the chunk length */
11746         ch->chunk_length = htons(len + old_len);
11747         chk->send_size = len + old_len;
11748         chk->book_size = SCTP_SIZE32(chk->send_size);
11749         chk->book_size_scale = 0;
11750         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11751         return;
11752 }
11753 
11754 void
11755 sctp_add_stream_reset_result(struct sctp_tmit_chunk *chk,
11756     uint32_t resp_seq, uint32_t result)
11757 {
11758         uint16_t len, old_len;
11759         struct sctp_stream_reset_response *resp;
11760         struct sctp_chunkhdr *ch;
11761 
11762         ch = mtod(chk->data, struct sctp_chunkhdr *);
11763         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11764 
11765         /* get to new offset for the param. */
11766         resp = (struct sctp_stream_reset_response *)((caddr_t)ch + len);
11767         /* now how long will this param be? */
11768         len = sizeof(struct sctp_stream_reset_response);
11769         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11770         resp->ph.param_length = htons(len);
11771         resp->response_seq = htonl(resp_seq);
11772         resp->result = ntohl(result);
11773 
11774         /* now fix the chunk length */
11775         ch->chunk_length = htons(len + old_len);
11776         chk->book_size = len + old_len;
11777         chk->book_size_scale = 0;
11778         chk->send_size = SCTP_SIZE32(chk->book_size);
11779         SCTP_BUF_LEN(chk->data) = chk->send_size;
11780         return;
11781 }
11782 
11783 void
11784 sctp_send_deferred_reset_response(struct sctp_tcb *stcb,
11785     struct sctp_stream_reset_list *ent,
11786     int response)
11787 {
11788         struct sctp_association *asoc;
11789         struct sctp_tmit_chunk *chk;
11790         struct sctp_chunkhdr *ch;
11791 
11792         asoc = &stcb->asoc;
11793 
11794         /*
11795          * Reset our last reset action to the new one IP -> response
11796          * (PERFORMED probably). This assures that if we fail to send, a
11797          * retran from the peer will get the new response.
11798          */
11799         asoc->last_reset_action[0] = response;
11800         if (asoc->stream_reset_outstanding) {
11801                 return;
11802         }
11803         sctp_alloc_a_chunk(stcb, chk);
11804         if (chk == NULL) {
11805                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11806                 return;
11807         }
11808         chk->copy_by_ref = 0;
11809         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11810         chk->rec.chunk_id.can_take_data = 0;
11811         chk->flags = 0;
11812         chk->asoc = &stcb->asoc;
11813         chk->book_size = sizeof(struct sctp_chunkhdr);
11814         chk->send_size = SCTP_SIZE32(chk->book_size);
11815         chk->book_size_scale = 0;
11816         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11817         if (chk->data == NULL) {
11818                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
11819                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11820                 return;
11821         }
11822         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11823         sctp_add_stream_reset_result(chk, ent->seq, response);
11824         /* setup chunk parameters */
11825         chk->sent = SCTP_DATAGRAM_UNSENT;
11826         chk->snd_count = 0;
11827         if (stcb->asoc.alternate) {
11828                 chk->whoTo = stcb->asoc.alternate;
11829         } else {
11830                 chk->whoTo = stcb->asoc.primary_destination;
11831         }
11832         ch = mtod(chk->data, struct sctp_chunkhdr *);
11833         ch->chunk_type = SCTP_STREAM_RESET;
11834         ch->chunk_flags = 0;
11835         ch->chunk_length = htons(chk->book_size);
11836         atomic_add_int(&chk->whoTo->ref_count, 1);
11837         SCTP_BUF_LEN(chk->data) = chk->send_size;
11838         /* insert the chunk for sending */
11839         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
11840             chk,
11841             sctp_next);
11842         asoc->ctrl_queue_cnt++;
11843 }
11844 
11845 void
11846 sctp_add_stream_reset_result_tsn(struct sctp_tmit_chunk *chk,
11847     uint32_t resp_seq, uint32_t result,
11848     uint32_t send_una, uint32_t recv_next)
11849 {
11850         uint16_t len, old_len;
11851         struct sctp_stream_reset_response_tsn *resp;
11852         struct sctp_chunkhdr *ch;
11853 
11854         ch = mtod(chk->data, struct sctp_chunkhdr *);
11855         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11856 
11857         /* get to new offset for the param. */
11858         resp = (struct sctp_stream_reset_response_tsn *)((caddr_t)ch + len);
11859         /* now how long will this param be? */
11860         len = sizeof(struct sctp_stream_reset_response_tsn);
11861         resp->ph.param_type = htons(SCTP_STR_RESET_RESPONSE);
11862         resp->ph.param_length = htons(len);
11863         resp->response_seq = htonl(resp_seq);
11864         resp->result = htonl(result);
11865         resp->senders_next_tsn = htonl(send_una);
11866         resp->receivers_next_tsn = htonl(recv_next);
11867 
11868         /* now fix the chunk length */
11869         ch->chunk_length = htons(len + old_len);
11870         chk->book_size = len + old_len;
11871         chk->send_size = SCTP_SIZE32(chk->book_size);
11872         chk->book_size_scale = 0;
11873         SCTP_BUF_LEN(chk->data) = chk->send_size;
11874         return;
11875 }
11876 
11877 static void
11878 sctp_add_an_out_stream(struct sctp_tmit_chunk *chk,
11879     uint32_t seq,
11880     uint16_t adding)
11881 {
11882         uint16_t len, old_len;
11883         struct sctp_chunkhdr *ch;
11884         struct sctp_stream_reset_add_strm *addstr;
11885 
11886         ch = mtod(chk->data, struct sctp_chunkhdr *);
11887         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11888 
11889         /* get to new offset for the param. */
11890         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11891         /* now how long will this param be? */
11892         len = sizeof(struct sctp_stream_reset_add_strm);
11893 
11894         /* Fill it out. */
11895         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_OUT_STREAMS);
11896         addstr->ph.param_length = htons(len);
11897         addstr->request_seq = htonl(seq);
11898         addstr->number_of_streams = htons(adding);
11899         addstr->reserved = 0;
11900 
11901         /* now fix the chunk length */
11902         ch->chunk_length = htons(len + old_len);
11903         chk->send_size = len + old_len;
11904         chk->book_size = SCTP_SIZE32(chk->send_size);
11905         chk->book_size_scale = 0;
11906         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11907         return;
11908 }
11909 
11910 static void
11911 sctp_add_an_in_stream(struct sctp_tmit_chunk *chk,
11912     uint32_t seq,
11913     uint16_t adding)
11914 {
11915         uint16_t len, old_len;
11916         struct sctp_chunkhdr *ch;
11917         struct sctp_stream_reset_add_strm *addstr;
11918 
11919         ch = mtod(chk->data, struct sctp_chunkhdr *);
11920         old_len = len = SCTP_SIZE32(ntohs(ch->chunk_length));
11921 
11922         /* get to new offset for the param. */
11923         addstr = (struct sctp_stream_reset_add_strm *)((caddr_t)ch + len);
11924         /* now how long will this param be? */
11925         len = sizeof(struct sctp_stream_reset_add_strm);
11926         /* Fill it out. */
11927         addstr->ph.param_type = htons(SCTP_STR_RESET_ADD_IN_STREAMS);
11928         addstr->ph.param_length = htons(len);
11929         addstr->request_seq = htonl(seq);
11930         addstr->number_of_streams = htons(adding);
11931         addstr->reserved = 0;
11932 
11933         /* now fix the chunk length */
11934         ch->chunk_length = htons(len + old_len);
11935         chk->send_size = len + old_len;
11936         chk->book_size = SCTP_SIZE32(chk->send_size);
11937         chk->book_size_scale = 0;
11938         SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
11939         return;
11940 }
11941 
11942 int
11943 sctp_send_stream_reset_out_if_possible(struct sctp_tcb *stcb, int so_locked)
11944 {
11945         struct sctp_association *asoc;
11946         struct sctp_tmit_chunk *chk;
11947         struct sctp_chunkhdr *ch;
11948         uint32_t seq;
11949 
11950         asoc = &stcb->asoc;
11951         asoc->trigger_reset = 0;
11952         if (asoc->stream_reset_outstanding) {
11953                 return (EALREADY);
11954         }
11955         sctp_alloc_a_chunk(stcb, chk);
11956         if (chk == NULL) {
11957                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11958                 return (ENOMEM);
11959         }
11960         chk->copy_by_ref = 0;
11961         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
11962         chk->rec.chunk_id.can_take_data = 0;
11963         chk->flags = 0;
11964         chk->asoc = &stcb->asoc;
11965         chk->book_size = sizeof(struct sctp_chunkhdr);
11966         chk->send_size = SCTP_SIZE32(chk->book_size);
11967         chk->book_size_scale = 0;
11968         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
11969         if (chk->data == NULL) {
11970                 sctp_free_a_chunk(stcb, chk, so_locked);
11971                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
11972                 return (ENOMEM);
11973         }
11974         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
11975 
11976         /* setup chunk parameters */
11977         chk->sent = SCTP_DATAGRAM_UNSENT;
11978         chk->snd_count = 0;
11979         if (stcb->asoc.alternate) {
11980                 chk->whoTo = stcb->asoc.alternate;
11981         } else {
11982                 chk->whoTo = stcb->asoc.primary_destination;
11983         }
11984         ch = mtod(chk->data, struct sctp_chunkhdr *);
11985         ch->chunk_type = SCTP_STREAM_RESET;
11986         ch->chunk_flags = 0;
11987         ch->chunk_length = htons(chk->book_size);
11988         atomic_add_int(&chk->whoTo->ref_count, 1);
11989         SCTP_BUF_LEN(chk->data) = chk->send_size;
11990         seq = stcb->asoc.str_reset_seq_out;
11991         if (sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1))) {
11992                 seq++;
11993                 asoc->stream_reset_outstanding++;
11994         } else {
11995                 m_freem(chk->data);
11996                 chk->data = NULL;
11997                 sctp_free_a_chunk(stcb, chk, so_locked);
11998                 return (ENOENT);
11999         }
12000         asoc->str_reset = chk;
12001         /* insert the chunk for sending */
12002         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12003             chk,
12004             sctp_next);
12005         asoc->ctrl_queue_cnt++;
12006 
12007         if (stcb->asoc.send_sack) {
12008                 sctp_send_sack(stcb, so_locked);
12009         }
12010         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12011         return (0);
12012 }
12013 
12014 int
12015 sctp_send_str_reset_req(struct sctp_tcb *stcb,
12016     uint16_t number_entries, uint16_t * list,
12017     uint8_t send_in_req,
12018     uint8_t send_tsn_req,
12019     uint8_t add_stream,
12020     uint16_t adding_o,
12021     uint16_t adding_i, uint8_t peer_asked)
12022 {
12023         struct sctp_association *asoc;
12024         struct sctp_tmit_chunk *chk;
12025         struct sctp_chunkhdr *ch;
12026         int can_send_out_req = 0;
12027         uint32_t seq;
12028 
12029         asoc = &stcb->asoc;
12030         if (asoc->stream_reset_outstanding) {
12031                 /*-
12032                  * Already one pending, must get ACK back to clear the flag.
12033                  */
12034                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EBUSY);
12035                 return (EBUSY);
12036         }
12037         if ((send_in_req == 0) && (send_tsn_req == 0) &&
12038             (add_stream == 0)) {
12039                 /* nothing to do */
12040                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12041                 return (EINVAL);
12042         }
12043         if (send_tsn_req && send_in_req) {
12044                 /* error, can't do that */
12045                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12046                 return (EINVAL);
12047         } else if (send_in_req) {
12048                 can_send_out_req = 1;
12049         }
12050         if (number_entries > (MCLBYTES -
12051             SCTP_MIN_OVERHEAD -
12052             sizeof(struct sctp_chunkhdr) -
12053             sizeof(struct sctp_stream_reset_out_request)) /
12054             sizeof(uint16_t)) {
12055                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12056                 return (ENOMEM);
12057         }
12058         sctp_alloc_a_chunk(stcb, chk);
12059         if (chk == NULL) {
12060                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12061                 return (ENOMEM);
12062         }
12063         chk->copy_by_ref = 0;
12064         chk->rec.chunk_id.id = SCTP_STREAM_RESET;
12065         chk->rec.chunk_id.can_take_data = 0;
12066         chk->flags = 0;
12067         chk->asoc = &stcb->asoc;
12068         chk->book_size = sizeof(struct sctp_chunkhdr);
12069         chk->send_size = SCTP_SIZE32(chk->book_size);
12070         chk->book_size_scale = 0;
12071 
12072         chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
12073         if (chk->data == NULL) {
12074                 sctp_free_a_chunk(stcb, chk, SCTP_SO_LOCKED);
12075                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12076                 return (ENOMEM);
12077         }
12078         SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
12079 
12080         /* setup chunk parameters */
12081         chk->sent = SCTP_DATAGRAM_UNSENT;
12082         chk->snd_count = 0;
12083         if (stcb->asoc.alternate) {
12084                 chk->whoTo = stcb->asoc.alternate;
12085         } else {
12086                 chk->whoTo = stcb->asoc.primary_destination;
12087         }
12088         atomic_add_int(&chk->whoTo->ref_count, 1);
12089         ch = mtod(chk->data, struct sctp_chunkhdr *);
12090         ch->chunk_type = SCTP_STREAM_RESET;
12091         ch->chunk_flags = 0;
12092         ch->chunk_length = htons(chk->book_size);
12093         SCTP_BUF_LEN(chk->data) = chk->send_size;
12094 
12095         seq = stcb->asoc.str_reset_seq_out;
12096         if (can_send_out_req) {
12097                 int ret;
12098 
12099                 ret = sctp_add_stream_reset_out(stcb, chk, seq, (stcb->asoc.str_reset_seq_in - 1), (stcb->asoc.sending_seq - 1));
12100                 if (ret) {
12101                         seq++;
12102                         asoc->stream_reset_outstanding++;
12103                 }
12104         }
12105         if ((add_stream & 1) &&
12106             ((stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt) < adding_o)) {
12107                 /* Need to allocate more */
12108                 struct sctp_stream_out *oldstream;
12109                 struct sctp_stream_queue_pending *sp, *nsp;
12110                 int i;
12111 
12112 #if defined(SCTP_DETAILED_STR_STATS)
12113                 int j;
12114 
12115 #endif
12116 
12117                 oldstream = stcb->asoc.strmout;
12118                 /* get some more */
12119                 SCTP_MALLOC(stcb->asoc.strmout, struct sctp_stream_out *,
12120                     (stcb->asoc.streamoutcnt + adding_o) * sizeof(struct sctp_stream_out),
12121                     SCTP_M_STRMO);
12122                 if (stcb->asoc.strmout == NULL) {
12123                         uint8_t x;
12124 
12125                         stcb->asoc.strmout = oldstream;
12126                         /* Turn off the bit */
12127                         x = add_stream & 0xfe;
12128                         add_stream = x;
12129                         goto skip_stuff;
12130                 }
12131                 /*
12132                  * Ok now we proceed with copying the old out stuff and
12133                  * initializing the new stuff.
12134                  */
12135                 SCTP_TCB_SEND_LOCK(stcb);
12136                 stcb->asoc.ss_functions.sctp_ss_clear(stcb, &stcb->asoc, 0, 1);
12137                 for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
12138                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12139                         stcb->asoc.strmout[i].chunks_on_queues = oldstream[i].chunks_on_queues;
12140                         stcb->asoc.strmout[i].next_sequence_send = oldstream[i].next_sequence_send;
12141                         stcb->asoc.strmout[i].last_msg_incomplete = oldstream[i].last_msg_incomplete;
12142                         stcb->asoc.strmout[i].stream_no = i;
12143                         stcb->asoc.strmout[i].state = oldstream[i].state;
12144                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], &oldstream[i]);
12145                         /* now anything on those queues? */
12146                         TAILQ_FOREACH_SAFE(sp, &oldstream[i].outqueue, next, nsp) {
12147                                 TAILQ_REMOVE(&oldstream[i].outqueue, sp, next);
12148                                 TAILQ_INSERT_TAIL(&stcb->asoc.strmout[i].outqueue, sp, next);
12149                         }
12150                         /* Now move assoc pointers too */
12151                         if (stcb->asoc.last_out_stream == &oldstream[i]) {
12152                                 stcb->asoc.last_out_stream = &stcb->asoc.strmout[i];
12153                         }
12154                         if (stcb->asoc.locked_on_sending == &oldstream[i]) {
12155                                 stcb->asoc.locked_on_sending = &stcb->asoc.strmout[i];
12156                         }
12157                 }
12158                 /* now the new streams */
12159                 stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 1);
12160                 for (i = stcb->asoc.streamoutcnt; i < (stcb->asoc.streamoutcnt + adding_o); i++) {
12161                         TAILQ_INIT(&stcb->asoc.strmout[i].outqueue);
12162                         stcb->asoc.strmout[i].chunks_on_queues = 0;
12163 #if defined(SCTP_DETAILED_STR_STATS)
12164                         for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
12165                                 stcb->asoc.strmout[i].abandoned_sent[j] = 0;
12166                                 stcb->asoc.strmout[i].abandoned_unsent[j] = 0;
12167                         }
12168 #else
12169                         stcb->asoc.strmout[i].abandoned_sent[0] = 0;
12170                         stcb->asoc.strmout[i].abandoned_unsent[0] = 0;
12171 #endif
12172                         stcb->asoc.strmout[i].next_sequence_send = 0x0;
12173                         stcb->asoc.strmout[i].stream_no = i;
12174                         stcb->asoc.strmout[i].last_msg_incomplete = 0;
12175                         stcb->asoc.ss_functions.sctp_ss_init_stream(&stcb->asoc.strmout[i], NULL);
12176                         stcb->asoc.strmout[i].state = SCTP_STREAM_CLOSED;
12177                 }
12178                 stcb->asoc.strm_realoutsize = stcb->asoc.streamoutcnt + adding_o;
12179                 SCTP_FREE(oldstream, SCTP_M_STRMO);
12180                 SCTP_TCB_SEND_UNLOCK(stcb);
12181         }
12182 skip_stuff:
12183         if ((add_stream & 1) && (adding_o > 0)) {
12184                 asoc->strm_pending_add_size = adding_o;
12185                 asoc->peer_req_out = peer_asked;
12186                 sctp_add_an_out_stream(chk, seq, adding_o);
12187                 seq++;
12188                 asoc->stream_reset_outstanding++;
12189         }
12190         if ((add_stream & 2) && (adding_i > 0)) {
12191                 sctp_add_an_in_stream(chk, seq, adding_i);
12192                 seq++;
12193                 asoc->stream_reset_outstanding++;
12194         }
12195         if (send_in_req) {
12196                 sctp_add_stream_reset_in(chk, number_entries, list, seq);
12197                 seq++;
12198                 asoc->stream_reset_outstanding++;
12199         }
12200         if (send_tsn_req) {
12201                 sctp_add_stream_reset_tsn(chk, seq);
12202                 asoc->stream_reset_outstanding++;
12203         }
12204         asoc->str_reset = chk;
12205         /* insert the chunk for sending */
12206         TAILQ_INSERT_TAIL(&asoc->control_send_queue,
12207             chk,
12208             sctp_next);
12209         asoc->ctrl_queue_cnt++;
12210         if (stcb->asoc.send_sack) {
12211                 sctp_send_sack(stcb, SCTP_SO_LOCKED);
12212         }
12213         sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo);
12214         return (0);
12215 }
12216 
12217 void
12218 sctp_send_abort(struct mbuf *m, int iphlen, struct sockaddr *src, struct sockaddr *dst,
12219     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12220     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12221     uint32_t vrf_id, uint16_t port)
12222 {
12223         /* Don't respond to an ABORT with an ABORT. */
12224         if (sctp_is_there_an_abort_here(m, iphlen, &vtag)) {
12225                 if (cause)
12226                         sctp_m_freem(cause);
12227                 return;
12228         }
12229         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_ABORT_ASSOCIATION, cause,
12230             mflowtype, mflowid, fibnum,
12231             vrf_id, port);
12232         return;
12233 }
12234 
12235 void
12236 sctp_send_operr_to(struct sockaddr *src, struct sockaddr *dst,
12237     struct sctphdr *sh, uint32_t vtag, struct mbuf *cause,
12238     uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
12239     uint32_t vrf_id, uint16_t port)
12240 {
12241         sctp_send_resp_msg(src, dst, sh, vtag, SCTP_OPERATION_ERROR, cause,
12242             mflowtype, mflowid, fibnum,
12243             vrf_id, port);
12244         return;
12245 }
12246 
12247 static struct mbuf *
12248 sctp_copy_resume(struct uio *uio,
12249     int max_send_len,
12250     int user_marks_eor,
12251     int *error,
12252     uint32_t * sndout,
12253     struct mbuf **new_tail)
12254 {
12255         struct mbuf *m;
12256 
12257         m = m_uiotombuf(uio, M_WAITOK, max_send_len, 0,
12258             (M_PKTHDR | (user_marks_eor ? M_EOR : 0)));
12259         if (m == NULL) {
12260                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12261                 *error = ENOBUFS;
12262         } else {
12263                 *sndout = m_length(m, NULL);
12264                 *new_tail = m_last(m);
12265         }
12266         return (m);
12267 }
12268 
12269 static int
12270 sctp_copy_one(struct sctp_stream_queue_pending *sp,
12271     struct uio *uio,
12272     int resv_upfront)
12273 {
12274         sp->data = m_uiotombuf(uio, M_WAITOK, sp->length,
12275             resv_upfront, 0);
12276         if (sp->data == NULL) {
12277                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOBUFS);
12278                 return (ENOBUFS);
12279         }
12280         sp->tail_mbuf = m_last(sp->data);
12281         return (0);
12282 }
12283 
12284 
12285 
12286 static struct sctp_stream_queue_pending *
12287 sctp_copy_it_in(struct sctp_tcb *stcb,
12288     struct sctp_association *asoc,
12289     struct sctp_sndrcvinfo *srcv,
12290     struct uio *uio,
12291     struct sctp_nets *net,
12292     int max_send_len,
12293     int user_marks_eor,
12294     int *error)
12295 {
12296         /*-
12297          * This routine must be very careful in its work. Protocol
12298          * processing is up and running so care must be taken to spl...()
12299          * when you need to do something that may effect the stcb/asoc. The
12300          * sb is locked however. When data is copied the protocol processing
12301          * should be enabled since this is a slower operation...
12302          */
12303         struct sctp_stream_queue_pending *sp = NULL;
12304         int resv_in_first;
12305 
12306         *error = 0;
12307         /* Now can we send this? */
12308         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12309             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12310             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12311             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12312                 /* got data while shutting down */
12313                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12314                 *error = ECONNRESET;
12315                 goto out_now;
12316         }
12317         sctp_alloc_a_strmoq(stcb, sp);
12318         if (sp == NULL) {
12319                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12320                 *error = ENOMEM;
12321                 goto out_now;
12322         }
12323         sp->act_flags = 0;
12324         sp->sender_all_done = 0;
12325         sp->sinfo_flags = srcv->sinfo_flags;
12326         sp->timetolive = srcv->sinfo_timetolive;
12327         sp->ppid = srcv->sinfo_ppid;
12328         sp->context = srcv->sinfo_context;
12329         (void)SCTP_GETTIME_TIMEVAL(&sp->ts);
12330 
12331         sp->stream = srcv->sinfo_stream;
12332         sp->length = min(uio->uio_resid, max_send_len);
12333         if ((sp->length == (uint32_t) uio->uio_resid) &&
12334             ((user_marks_eor == 0) ||
12335             (srcv->sinfo_flags & SCTP_EOF) ||
12336             (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
12337                 sp->msg_is_complete = 1;
12338         } else {
12339                 sp->msg_is_complete = 0;
12340         }
12341         sp->sender_all_done = 0;
12342         sp->some_taken = 0;
12343         sp->put_last_out = 0;
12344         resv_in_first = sizeof(struct sctp_data_chunk);
12345         sp->data = sp->tail_mbuf = NULL;
12346         if (sp->length == 0) {
12347                 *error = 0;
12348                 goto skip_copy;
12349         }
12350         if (srcv->sinfo_keynumber_valid) {
12351                 sp->auth_keyid = srcv->sinfo_keynumber;
12352         } else {
12353                 sp->auth_keyid = stcb->asoc.authinfo.active_keyid;
12354         }
12355         if (sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.peer_auth_chunks)) {
12356                 sctp_auth_key_acquire(stcb, sp->auth_keyid);
12357                 sp->holds_key_ref = 1;
12358         }
12359         *error = sctp_copy_one(sp, uio, resv_in_first);
12360 skip_copy:
12361         if (*error) {
12362                 sctp_free_a_strmoq(stcb, sp, SCTP_SO_LOCKED);
12363                 sp = NULL;
12364         } else {
12365                 if (sp->sinfo_flags & SCTP_ADDR_OVER) {
12366                         sp->net = net;
12367                         atomic_add_int(&sp->net->ref_count, 1);
12368                 } else {
12369                         sp->net = NULL;
12370                 }
12371                 sctp_set_prsctp_policy(sp);
12372         }
12373 out_now:
12374         return (sp);
12375 }
12376 
12377 
12378 int
12379 sctp_sosend(struct socket *so,
12380     struct sockaddr *addr,
12381     struct uio *uio,
12382     struct mbuf *top,
12383     struct mbuf *control,
12384     int flags,
12385     struct thread *p
12386 )
12387 {
12388         int error, use_sndinfo = 0;
12389         struct sctp_sndrcvinfo sndrcvninfo;
12390         struct sockaddr *addr_to_use;
12391 
12392 #if defined(INET) && defined(INET6)
12393         struct sockaddr_in sin;
12394 
12395 #endif
12396 
12397         if (control) {
12398                 /* process cmsg snd/rcv info (maybe a assoc-id) */
12399                 if (sctp_find_cmsg(SCTP_SNDRCV, (void *)&sndrcvninfo, control,
12400                     sizeof(sndrcvninfo))) {
12401                         /* got one */
12402                         use_sndinfo = 1;
12403                 }
12404         }
12405         addr_to_use = addr;
12406 #if defined(INET) && defined(INET6)
12407         if ((addr) && (addr->sa_family == AF_INET6)) {
12408                 struct sockaddr_in6 *sin6;
12409 
12410                 sin6 = (struct sockaddr_in6 *)addr;
12411                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
12412                         in6_sin6_2_sin(&sin, sin6);
12413                         addr_to_use = (struct sockaddr *)&sin;
12414                 }
12415         }
12416 #endif
12417         error = sctp_lower_sosend(so, addr_to_use, uio, top,
12418             control,
12419             flags,
12420             use_sndinfo ? &sndrcvninfo : NULL
12421             ,p
12422             );
12423         return (error);
12424 }
12425 
12426 
12427 int
12428 sctp_lower_sosend(struct socket *so,
12429     struct sockaddr *addr,
12430     struct uio *uio,
12431     struct mbuf *i_pak,
12432     struct mbuf *control,
12433     int flags,
12434     struct sctp_sndrcvinfo *srcv
12435     ,
12436     struct thread *p
12437 )
12438 {
12439         unsigned int sndlen = 0, max_len;
12440         int error, len;
12441         struct mbuf *top = NULL;
12442         int queue_only = 0, queue_only_for_init = 0;
12443         int free_cnt_applied = 0;
12444         int un_sent;
12445         int now_filled = 0;
12446         unsigned int inqueue_bytes = 0;
12447         struct sctp_block_entry be;
12448         struct sctp_inpcb *inp;
12449         struct sctp_tcb *stcb = NULL;
12450         struct timeval now;
12451         struct sctp_nets *net;
12452         struct sctp_association *asoc;
12453         struct sctp_inpcb *t_inp;
12454         int user_marks_eor;
12455         int create_lock_applied = 0;
12456         int nagle_applies = 0;
12457         int some_on_control = 0;
12458         int got_all_of_the_send = 0;
12459         int hold_tcblock = 0;
12460         int non_blocking = 0;
12461         uint32_t local_add_more, local_soresv = 0;
12462         uint16_t port;
12463         uint16_t sinfo_flags;
12464         sctp_assoc_t sinfo_assoc_id;
12465 
12466         error = 0;
12467         net = NULL;
12468         stcb = NULL;
12469         asoc = NULL;
12470 
12471         t_inp = inp = (struct sctp_inpcb *)so->so_pcb;
12472         if (inp == NULL) {
12473                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12474                 error = EINVAL;
12475                 if (i_pak) {
12476                         SCTP_RELEASE_PKT(i_pak);
12477                 }
12478                 return (error);
12479         }
12480         if ((uio == NULL) && (i_pak == NULL)) {
12481                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12482                 return (EINVAL);
12483         }
12484         user_marks_eor = sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXPLICIT_EOR);
12485         atomic_add_int(&inp->total_sends, 1);
12486         if (uio) {
12487                 if (uio->uio_resid < 0) {
12488                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12489                         return (EINVAL);
12490                 }
12491                 sndlen = uio->uio_resid;
12492         } else {
12493                 top = SCTP_HEADER_TO_CHAIN(i_pak);
12494                 sndlen = SCTP_HEADER_LEN(i_pak);
12495         }
12496         SCTPDBG(SCTP_DEBUG_OUTPUT1, "Send called addr:%p send length %d\n",
12497             (void *)addr,
12498             sndlen);
12499         if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
12500             (inp->sctp_socket->so_qlimit)) {
12501                 /* The listener can NOT send */
12502                 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12503                 error = ENOTCONN;
12504                 goto out_unlocked;
12505         }
12506         /**
12507          * Pre-screen address, if one is given the sin-len
12508          * must be set correctly!
12509          */
12510         if (addr) {
12511                 union sctp_sockstore *raddr = (union sctp_sockstore *)addr;
12512 
12513                 switch (raddr->sa.sa_family) {
12514 #ifdef INET
12515                 case AF_INET:
12516                         if (raddr->sin.sin_len != sizeof(struct sockaddr_in)) {
12517                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12518                                 error = EINVAL;
12519                                 goto out_unlocked;
12520                         }
12521                         port = raddr->sin.sin_port;
12522                         break;
12523 #endif
12524 #ifdef INET6
12525                 case AF_INET6:
12526                         if (raddr->sin6.sin6_len != sizeof(struct sockaddr_in6)) {
12527                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12528                                 error = EINVAL;
12529                                 goto out_unlocked;
12530                         }
12531                         port = raddr->sin6.sin6_port;
12532                         break;
12533 #endif
12534                 default:
12535                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EAFNOSUPPORT);
12536                         error = EAFNOSUPPORT;
12537                         goto out_unlocked;
12538                 }
12539         } else
12540                 port = 0;
12541 
12542         if (srcv) {
12543                 sinfo_flags = srcv->sinfo_flags;
12544                 sinfo_assoc_id = srcv->sinfo_assoc_id;
12545                 if (INVALID_SINFO_FLAG(sinfo_flags) ||
12546                     PR_SCTP_INVALID_POLICY(sinfo_flags)) {
12547                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12548                         error = EINVAL;
12549                         goto out_unlocked;
12550                 }
12551                 if (srcv->sinfo_flags)
12552                         SCTP_STAT_INCR(sctps_sends_with_flags);
12553         } else {
12554                 sinfo_flags = inp->def_send.sinfo_flags;
12555                 sinfo_assoc_id = inp->def_send.sinfo_assoc_id;
12556         }
12557         if (sinfo_flags & SCTP_SENDALL) {
12558                 /* its a sendall */
12559                 error = sctp_sendall(inp, uio, top, srcv);
12560                 top = NULL;
12561                 goto out_unlocked;
12562         }
12563         if ((sinfo_flags & SCTP_ADDR_OVER) && (addr == NULL)) {
12564                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12565                 error = EINVAL;
12566                 goto out_unlocked;
12567         }
12568         /* now we must find the assoc */
12569         if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) ||
12570             (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
12571                 SCTP_INP_RLOCK(inp);
12572                 stcb = LIST_FIRST(&inp->sctp_asoc_list);
12573                 if (stcb) {
12574                         SCTP_TCB_LOCK(stcb);
12575                         hold_tcblock = 1;
12576                 }
12577                 SCTP_INP_RUNLOCK(inp);
12578         } else if (sinfo_assoc_id) {
12579                 stcb = sctp_findassociation_ep_asocid(inp, sinfo_assoc_id, 0);
12580         } else if (addr) {
12581                 /*-
12582                  * Since we did not use findep we must
12583                  * increment it, and if we don't find a tcb
12584                  * decrement it.
12585                  */
12586                 SCTP_INP_WLOCK(inp);
12587                 SCTP_INP_INCR_REF(inp);
12588                 SCTP_INP_WUNLOCK(inp);
12589                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12590                 if (stcb == NULL) {
12591                         SCTP_INP_WLOCK(inp);
12592                         SCTP_INP_DECR_REF(inp);
12593                         SCTP_INP_WUNLOCK(inp);
12594                 } else {
12595                         hold_tcblock = 1;
12596                 }
12597         }
12598         if ((stcb == NULL) && (addr)) {
12599                 /* Possible implicit send? */
12600                 SCTP_ASOC_CREATE_LOCK(inp);
12601                 create_lock_applied = 1;
12602                 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
12603                     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
12604                         /* Should I really unlock ? */
12605                         SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12606                         error = EINVAL;
12607                         goto out_unlocked;
12608 
12609                 }
12610                 if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) &&
12611                     (addr->sa_family == AF_INET6)) {
12612                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12613                         error = EINVAL;
12614                         goto out_unlocked;
12615                 }
12616                 SCTP_INP_WLOCK(inp);
12617                 SCTP_INP_INCR_REF(inp);
12618                 SCTP_INP_WUNLOCK(inp);
12619                 /* With the lock applied look again */
12620                 stcb = sctp_findassociation_ep_addr(&t_inp, addr, &net, NULL, NULL);
12621                 if ((stcb == NULL) && (control != NULL) && (port > 0)) {
12622                         stcb = sctp_findassociation_cmsgs(&t_inp, port, control, &net, &error);
12623                 }
12624                 if (stcb == NULL) {
12625                         SCTP_INP_WLOCK(inp);
12626                         SCTP_INP_DECR_REF(inp);
12627                         SCTP_INP_WUNLOCK(inp);
12628                 } else {
12629                         hold_tcblock = 1;
12630                 }
12631                 if (error) {
12632                         goto out_unlocked;
12633                 }
12634                 if (t_inp != inp) {
12635                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOTCONN);
12636                         error = ENOTCONN;
12637                         goto out_unlocked;
12638                 }
12639         }
12640         if (stcb == NULL) {
12641                 if (addr == NULL) {
12642                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12643                         error = ENOENT;
12644                         goto out_unlocked;
12645                 } else {
12646                         /* We must go ahead and start the INIT process */
12647                         uint32_t vrf_id;
12648 
12649                         if ((sinfo_flags & SCTP_ABORT) ||
12650                             ((sinfo_flags & SCTP_EOF) && (sndlen == 0))) {
12651                                 /*-
12652                                  * User asks to abort a non-existant assoc,
12653                                  * or EOF a non-existant assoc with no data
12654                                  */
12655                                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOENT);
12656                                 error = ENOENT;
12657                                 goto out_unlocked;
12658                         }
12659                         /* get an asoc/stcb struct */
12660                         vrf_id = inp->def_vrf_id;
12661 #ifdef INVARIANTS
12662                         if (create_lock_applied == 0) {
12663                                 panic("Error, should hold create lock and I don't?");
12664                         }
12665 #endif
12666                         stcb = sctp_aloc_assoc(inp, addr, &error, 0, vrf_id,
12667                             inp->sctp_ep.pre_open_stream_count,
12668                             p
12669                             );
12670                         if (stcb == NULL) {
12671                                 /* Error is setup for us in the call */
12672                                 goto out_unlocked;
12673                         }
12674                         if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
12675                                 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
12676                                 /*
12677                                  * Set the connected flag so we can queue
12678                                  * data
12679                                  */
12680                                 soisconnecting(so);
12681                         }
12682                         hold_tcblock = 1;
12683                         if (create_lock_applied) {
12684                                 SCTP_ASOC_CREATE_UNLOCK(inp);
12685                                 create_lock_applied = 0;
12686                         } else {
12687                                 SCTP_PRINTF("Huh-3? create lock should have been on??\n");
12688                         }
12689                         /*
12690                          * Turn on queue only flag to prevent data from
12691                          * being sent
12692                          */
12693                         queue_only = 1;
12694                         asoc = &stcb->asoc;
12695                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
12696                         (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
12697 
12698                         /* initialize authentication params for the assoc */
12699                         sctp_initialize_auth_params(inp, stcb);
12700 
12701                         if (control) {
12702                                 if (sctp_process_cmsgs_for_init(stcb, control, &error)) {
12703                                         sctp_free_assoc(inp, stcb, SCTP_PCBFREE_FORCE,
12704                                             SCTP_FROM_SCTP_OUTPUT + SCTP_LOC_5);
12705                                         hold_tcblock = 0;
12706                                         stcb = NULL;
12707                                         goto out_unlocked;
12708                                 }
12709                         }
12710                         /* out with the INIT */
12711                         queue_only_for_init = 1;
12712                         /*-
12713                          * we may want to dig in after this call and adjust the MTU
12714                          * value. It defaulted to 1500 (constant) but the ro
12715                          * structure may now have an update and thus we may need to
12716                          * change it BEFORE we append the message.
12717                          */
12718                 }
12719         } else
12720                 asoc = &stcb->asoc;
12721         if (srcv == NULL)
12722                 srcv = (struct sctp_sndrcvinfo *)&asoc->def_send;
12723         if (srcv->sinfo_flags & SCTP_ADDR_OVER) {
12724                 if (addr)
12725                         net = sctp_findnet(stcb, addr);
12726                 else
12727                         net = NULL;
12728                 if ((net == NULL) ||
12729                     ((port != 0) && (port != stcb->rport))) {
12730                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12731                         error = EINVAL;
12732                         goto out_unlocked;
12733                 }
12734         } else {
12735                 if (stcb->asoc.alternate) {
12736                         net = stcb->asoc.alternate;
12737                 } else {
12738                         net = stcb->asoc.primary_destination;
12739                 }
12740         }
12741         atomic_add_int(&stcb->total_sends, 1);
12742         /* Keep the stcb from being freed under our feet */
12743         atomic_add_int(&asoc->refcnt, 1);
12744         free_cnt_applied = 1;
12745 
12746         if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_NO_FRAGMENT)) {
12747                 if (sndlen > asoc->smallest_mtu) {
12748                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12749                         error = EMSGSIZE;
12750                         goto out_unlocked;
12751                 }
12752         }
12753         if (SCTP_SO_IS_NBIO(so)
12754             || (flags & MSG_NBIO)
12755             ) {
12756                 non_blocking = 1;
12757         }
12758         /* would we block? */
12759         if (non_blocking) {
12760                 if (hold_tcblock == 0) {
12761                         SCTP_TCB_LOCK(stcb);
12762                         hold_tcblock = 1;
12763                 }
12764                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12765                 if ((SCTP_SB_LIMIT_SND(so) < (sndlen + inqueue_bytes + stcb->asoc.sb_send_resv)) ||
12766                     (stcb->asoc.chunks_on_out_queue >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12767                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EWOULDBLOCK);
12768                         if (sndlen > SCTP_SB_LIMIT_SND(so))
12769                                 error = EMSGSIZE;
12770                         else
12771                                 error = EWOULDBLOCK;
12772                         goto out_unlocked;
12773                 }
12774                 stcb->asoc.sb_send_resv += sndlen;
12775                 SCTP_TCB_UNLOCK(stcb);
12776                 hold_tcblock = 0;
12777         } else {
12778                 atomic_add_int(&stcb->asoc.sb_send_resv, sndlen);
12779         }
12780         local_soresv = sndlen;
12781         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
12782                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12783                 error = ECONNRESET;
12784                 goto out_unlocked;
12785         }
12786         if (create_lock_applied) {
12787                 SCTP_ASOC_CREATE_UNLOCK(inp);
12788                 create_lock_applied = 0;
12789         }
12790         /* Is the stream no. valid? */
12791         if (srcv->sinfo_stream >= asoc->streamoutcnt) {
12792                 /* Invalid stream number */
12793                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12794                 error = EINVAL;
12795                 goto out_unlocked;
12796         }
12797         if ((asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPEN) &&
12798             (asoc->strmout[srcv->sinfo_stream].state != SCTP_STREAM_OPENING)) {
12799                 /*
12800                  * Can't queue any data while stream reset is underway.
12801                  */
12802                 if (asoc->strmout[srcv->sinfo_stream].state > SCTP_STREAM_OPEN) {
12803                         error = EAGAIN;
12804                 } else {
12805                         error = EINVAL;
12806                 }
12807                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, error);
12808                 goto out_unlocked;
12809         }
12810         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12811             (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12812                 queue_only = 1;
12813         }
12814         /* we are now done with all control */
12815         if (control) {
12816                 sctp_m_freem(control);
12817                 control = NULL;
12818         }
12819         if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) ||
12820             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) ||
12821             (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) ||
12822             (asoc->state & SCTP_STATE_SHUTDOWN_PENDING)) {
12823                 if (srcv->sinfo_flags & SCTP_ABORT) {
12824                         ;
12825                 } else {
12826                         SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
12827                         error = ECONNRESET;
12828                         goto out_unlocked;
12829                 }
12830         }
12831         /* Ok, we will attempt a msgsnd :> */
12832         if (p) {
12833                 p->td_ru.ru_msgsnd++;
12834         }
12835         /* Are we aborting? */
12836         if (srcv->sinfo_flags & SCTP_ABORT) {
12837                 struct mbuf *mm;
12838                 int tot_demand, tot_out = 0, max_out;
12839 
12840                 SCTP_STAT_INCR(sctps_sends_with_abort);
12841                 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
12842                     (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
12843                         /* It has to be up before we abort */
12844                         /* how big is the user initiated abort? */
12845                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12846                         error = EINVAL;
12847                         goto out;
12848                 }
12849                 if (hold_tcblock) {
12850                         SCTP_TCB_UNLOCK(stcb);
12851                         hold_tcblock = 0;
12852                 }
12853                 if (top) {
12854                         struct mbuf *cntm = NULL;
12855 
12856                         mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 0, M_WAITOK, 1, MT_DATA);
12857                         if (sndlen != 0) {
12858                                 for (cntm = top; cntm; cntm = SCTP_BUF_NEXT(cntm)) {
12859                                         tot_out += SCTP_BUF_LEN(cntm);
12860                                 }
12861                         }
12862                 } else {
12863                         /* Must fit in a MTU */
12864                         tot_out = sndlen;
12865                         tot_demand = (tot_out + sizeof(struct sctp_paramhdr));
12866                         if (tot_demand > SCTP_DEFAULT_ADD_MORE) {
12867                                 /* To big */
12868                                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12869                                 error = EMSGSIZE;
12870                                 goto out;
12871                         }
12872                         mm = sctp_get_mbuf_for_msg(tot_demand, 0, M_WAITOK, 1, MT_DATA);
12873                 }
12874                 if (mm == NULL) {
12875                         SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, ENOMEM);
12876                         error = ENOMEM;
12877                         goto out;
12878                 }
12879                 max_out = asoc->smallest_mtu - sizeof(struct sctp_paramhdr);
12880                 max_out -= sizeof(struct sctp_abort_msg);
12881                 if (tot_out > max_out) {
12882                         tot_out = max_out;
12883                 }
12884                 if (mm) {
12885                         struct sctp_paramhdr *ph;
12886 
12887                         /* now move forward the data pointer */
12888                         ph = mtod(mm, struct sctp_paramhdr *);
12889                         ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
12890                         ph->param_length = htons(sizeof(struct sctp_paramhdr) + tot_out);
12891                         ph++;
12892                         SCTP_BUF_LEN(mm) = tot_out + sizeof(struct sctp_paramhdr);
12893                         if (top == NULL) {
12894                                 error = uiomove((caddr_t)ph, (int)tot_out, uio);
12895                                 if (error) {
12896                                         /*-
12897                                          * Here if we can't get his data we
12898                                          * still abort we just don't get to
12899                                          * send the users note :-0
12900                                          */
12901                                         sctp_m_freem(mm);
12902                                         mm = NULL;
12903                                 }
12904                         } else {
12905                                 if (sndlen != 0) {
12906                                         SCTP_BUF_NEXT(mm) = top;
12907                                 }
12908                         }
12909                 }
12910                 if (hold_tcblock == 0) {
12911                         SCTP_TCB_LOCK(stcb);
12912                 }
12913                 atomic_add_int(&stcb->asoc.refcnt, -1);
12914                 free_cnt_applied = 0;
12915                 /* release this lock, otherwise we hang on ourselves */
12916                 sctp_abort_an_association(stcb->sctp_ep, stcb, mm, SCTP_SO_LOCKED);
12917                 /* now relock the stcb so everything is sane */
12918                 hold_tcblock = 0;
12919                 stcb = NULL;
12920                 /*
12921                  * In this case top is already chained to mm avoid double
12922                  * free, since we free it below if top != NULL and driver
12923                  * would free it after sending the packet out
12924                  */
12925                 if (sndlen != 0) {
12926                         top = NULL;
12927                 }
12928                 goto out_unlocked;
12929         }
12930         /* Calculate the maximum we can send */
12931         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12932         if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
12933                 if (non_blocking) {
12934                         /* we already checked for non-blocking above. */
12935                         max_len = sndlen;
12936                 } else {
12937                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
12938                 }
12939         } else {
12940                 max_len = 0;
12941         }
12942         if (hold_tcblock) {
12943                 SCTP_TCB_UNLOCK(stcb);
12944                 hold_tcblock = 0;
12945         }
12946         if (asoc->strmout == NULL) {
12947                 /* huh? software error */
12948                 SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EFAULT);
12949                 error = EFAULT;
12950                 goto out_unlocked;
12951         }
12952         /* Unless E_EOR mode is on, we must make a send FIT in one call. */
12953         if ((user_marks_eor == 0) &&
12954             (sndlen > SCTP_SB_LIMIT_SND(stcb->sctp_socket))) {
12955                 /* It will NEVER fit */
12956                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EMSGSIZE);
12957                 error = EMSGSIZE;
12958                 goto out_unlocked;
12959         }
12960         if ((uio == NULL) && user_marks_eor) {
12961                 /*-
12962                  * We do not support eeor mode for
12963                  * sending with mbuf chains (like sendfile).
12964                  */
12965                 SCTP_LTRACE_ERR_RET(NULL, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
12966                 error = EINVAL;
12967                 goto out_unlocked;
12968         }
12969         if (user_marks_eor) {
12970                 local_add_more = min(SCTP_SB_LIMIT_SND(so), SCTP_BASE_SYSCTL(sctp_add_more_threshold));
12971         } else {
12972                 /*-
12973                  * For non-eeor the whole message must fit in
12974                  * the socket send buffer.
12975                  */
12976                 local_add_more = sndlen;
12977         }
12978         len = 0;
12979         if (non_blocking) {
12980                 goto skip_preblock;
12981         }
12982         if (((max_len <= local_add_more) &&
12983             (SCTP_SB_LIMIT_SND(so) >= local_add_more)) ||
12984             (max_len == 0) ||
12985             ((stcb->asoc.chunks_on_out_queue + stcb->asoc.stream_queue_cnt) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12986                 /* No room right now ! */
12987                 SOCKBUF_LOCK(&so->so_snd);
12988                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
12989                 while ((SCTP_SB_LIMIT_SND(so) < (inqueue_bytes + local_add_more)) ||
12990                     ((stcb->asoc.stream_queue_cnt + stcb->asoc.chunks_on_out_queue) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) {
12991                         SCTPDBG(SCTP_DEBUG_OUTPUT1, "pre_block limit:%u <(inq:%d + %d) || (%d+%d > %d)\n",
12992                             (unsigned int)SCTP_SB_LIMIT_SND(so),
12993                             inqueue_bytes,
12994                             local_add_more,
12995                             stcb->asoc.stream_queue_cnt,
12996                             stcb->asoc.chunks_on_out_queue,
12997                             SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue));
12998                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
12999                                 sctp_log_block(SCTP_BLOCK_LOG_INTO_BLKA, asoc, sndlen);
13000                         }
13001                         be.error = 0;
13002                         stcb->block_entry = &be;
13003                         error = sbwait(&so->so_snd);
13004                         stcb->block_entry = NULL;
13005                         if (error || so->so_error || be.error) {
13006                                 if (error == 0) {
13007                                         if (so->so_error)
13008                                                 error = so->so_error;
13009                                         if (be.error) {
13010                                                 error = be.error;
13011                                         }
13012                                 }
13013                                 SOCKBUF_UNLOCK(&so->so_snd);
13014                                 goto out_unlocked;
13015                         }
13016                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13017                                 sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13018                                     asoc, stcb->asoc.total_output_queue_size);
13019                         }
13020                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13021                                 goto out_unlocked;
13022                         }
13023                         inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13024                 }
13025                 if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
13026                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13027                 } else {
13028                         max_len = 0;
13029                 }
13030                 SOCKBUF_UNLOCK(&so->so_snd);
13031         }
13032 skip_preblock:
13033         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13034                 goto out_unlocked;
13035         }
13036         /*
13037          * sndlen covers for mbuf case uio_resid covers for the non-mbuf
13038          * case NOTE: uio will be null when top/mbuf is passed
13039          */
13040         if (sndlen == 0) {
13041                 if (srcv->sinfo_flags & SCTP_EOF) {
13042                         got_all_of_the_send = 1;
13043                         goto dataless_eof;
13044                 } else {
13045                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13046                         error = EINVAL;
13047                         goto out;
13048                 }
13049         }
13050         if (top == NULL) {
13051                 struct sctp_stream_queue_pending *sp;
13052                 struct sctp_stream_out *strm;
13053                 uint32_t sndout;
13054 
13055                 SCTP_TCB_SEND_LOCK(stcb);
13056                 if ((asoc->stream_locked) &&
13057                     (asoc->stream_locked_on != srcv->sinfo_stream)) {
13058                         SCTP_TCB_SEND_UNLOCK(stcb);
13059                         SCTP_LTRACE_ERR_RET(inp, stcb, net, SCTP_FROM_SCTP_OUTPUT, EINVAL);
13060                         error = EINVAL;
13061                         goto out;
13062                 }
13063                 SCTP_TCB_SEND_UNLOCK(stcb);
13064 
13065                 strm = &stcb->asoc.strmout[srcv->sinfo_stream];
13066                 if (strm->last_msg_incomplete == 0) {
13067         do_a_copy_in:
13068                         sp = sctp_copy_it_in(stcb, asoc, srcv, uio, net, max_len, user_marks_eor, &error);
13069                         if ((sp == NULL) || (error)) {
13070                                 goto out;
13071                         }
13072                         SCTP_TCB_SEND_LOCK(stcb);
13073                         if (sp->msg_is_complete) {
13074                                 strm->last_msg_incomplete = 0;
13075                                 asoc->stream_locked = 0;
13076                         } else {
13077                                 /*
13078                                  * Just got locked to this guy in case of an
13079                                  * interrupt.
13080                                  */
13081                                 strm->last_msg_incomplete = 1;
13082                                 asoc->stream_locked = 1;
13083                                 asoc->stream_locked_on = srcv->sinfo_stream;
13084                                 sp->sender_all_done = 0;
13085                         }
13086                         sctp_snd_sb_alloc(stcb, sp->length);
13087                         atomic_add_int(&asoc->stream_queue_cnt, 1);
13088                         if (srcv->sinfo_flags & SCTP_UNORDERED) {
13089                                 SCTP_STAT_INCR(sctps_sends_with_unord);
13090                         }
13091                         TAILQ_INSERT_TAIL(&strm->outqueue, sp, next);
13092                         stcb->asoc.ss_functions.sctp_ss_add_to_stream(stcb, asoc, strm, sp, 1);
13093                         SCTP_TCB_SEND_UNLOCK(stcb);
13094                 } else {
13095                         SCTP_TCB_SEND_LOCK(stcb);
13096                         sp = TAILQ_LAST(&strm->outqueue, sctp_streamhead);
13097                         SCTP_TCB_SEND_UNLOCK(stcb);
13098                         if (sp == NULL) {
13099                                 /* ???? Huh ??? last msg is gone */
13100 #ifdef INVARIANTS
13101                                 panic("Warning: Last msg marked incomplete, yet nothing left?");
13102 #else
13103                                 SCTP_PRINTF("Warning: Last msg marked incomplete, yet nothing left?\n");
13104                                 strm->last_msg_incomplete = 0;
13105 #endif
13106                                 goto do_a_copy_in;
13107 
13108                         }
13109                 }
13110                 while (uio->uio_resid > 0) {
13111                         /* How much room do we have? */
13112                         struct mbuf *new_tail, *mm;
13113 
13114                         if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13115                                 max_len = SCTP_SB_LIMIT_SND(so) - stcb->asoc.total_output_queue_size;
13116                         else
13117                                 max_len = 0;
13118 
13119                         if ((max_len > SCTP_BASE_SYSCTL(sctp_add_more_threshold)) ||
13120                             (max_len && (SCTP_SB_LIMIT_SND(so) < SCTP_BASE_SYSCTL(sctp_add_more_threshold))) ||
13121                             (uio->uio_resid && (uio->uio_resid <= (int)max_len))) {
13122                                 sndout = 0;
13123                                 new_tail = NULL;
13124                                 if (hold_tcblock) {
13125                                         SCTP_TCB_UNLOCK(stcb);
13126                                         hold_tcblock = 0;
13127                                 }
13128                                 mm = sctp_copy_resume(uio, max_len, user_marks_eor, &error, &sndout, &new_tail);
13129                                 if ((mm == NULL) || error) {
13130                                         if (mm) {
13131                                                 sctp_m_freem(mm);
13132                                         }
13133                                         goto out;
13134                                 }
13135                                 /* Update the mbuf and count */
13136                                 SCTP_TCB_SEND_LOCK(stcb);
13137                                 if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13138                                         /*
13139                                          * we need to get out. Peer probably
13140                                          * aborted.
13141                                          */
13142                                         sctp_m_freem(mm);
13143                                         if (stcb->asoc.state & SCTP_PCB_FLAGS_WAS_ABORTED) {
13144                                                 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_OUTPUT, ECONNRESET);
13145                                                 error = ECONNRESET;
13146                                         }
13147                                         SCTP_TCB_SEND_UNLOCK(stcb);
13148                                         goto out;
13149                                 }
13150                                 if (sp->tail_mbuf) {
13151                                         /* tack it to the end */
13152                                         SCTP_BUF_NEXT(sp->tail_mbuf) = mm;
13153                                         sp->tail_mbuf = new_tail;
13154                                 } else {
13155                                         /* A stolen mbuf */
13156                                         sp->data = mm;
13157                                         sp->tail_mbuf = new_tail;
13158                                 }
13159                                 sctp_snd_sb_alloc(stcb, sndout);
13160                                 atomic_add_int(&sp->length, sndout);
13161                                 len += sndout;
13162 
13163                                 /* Did we reach EOR? */
13164                                 if ((uio->uio_resid == 0) &&
13165                                     ((user_marks_eor == 0) ||
13166                                     (srcv->sinfo_flags & SCTP_EOF) ||
13167                                     (user_marks_eor && (srcv->sinfo_flags & SCTP_EOR)))) {
13168                                         sp->msg_is_complete = 1;
13169                                 } else {
13170                                         sp->msg_is_complete = 0;
13171                                 }
13172                                 SCTP_TCB_SEND_UNLOCK(stcb);
13173                         }
13174                         if (uio->uio_resid == 0) {
13175                                 /* got it all? */
13176                                 continue;
13177                         }
13178                         /* PR-SCTP? */
13179                         if ((asoc->prsctp_supported) && (asoc->sent_queue_cnt_removeable > 0)) {
13180                                 /*
13181                                  * This is ugly but we must assure locking
13182                                  * order
13183                                  */
13184                                 if (hold_tcblock == 0) {
13185                                         SCTP_TCB_LOCK(stcb);
13186                                         hold_tcblock = 1;
13187                                 }
13188                                 sctp_prune_prsctp(stcb, asoc, srcv, sndlen);
13189                                 inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
13190                                 if (SCTP_SB_LIMIT_SND(so) > stcb->asoc.total_output_queue_size)
13191                                         max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
13192                                 else
13193                                         max_len = 0;
13194                                 if (max_len > 0) {
13195                                         continue;
13196                                 }
13197                                 SCTP_TCB_UNLOCK(stcb);
13198                                 hold_tcblock = 0;
13199                         }
13200                         /* wait for space now */
13201                         if (non_blocking) {
13202                                 /* Non-blocking io in place out */
13203                                 goto skip_out_eof;
13204                         }
13205                         /* What about the INIT, send it maybe */
13206                         if (queue_only_for_init) {
13207                                 if (hold_tcblock == 0) {
13208                                         SCTP_TCB_LOCK(stcb);
13209                                         hold_tcblock = 1;
13210                                 }
13211                                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13212                                         /* a collision took us forward? */
13213                                         queue_only = 0;
13214                                 } else {
13215                                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13216                                         SCTP_SET_STATE(asoc, SCTP_STATE_COOKIE_WAIT);
13217                                         queue_only = 1;
13218                                 }
13219                         }
13220                         if ((net->flight_size > net->cwnd) &&
13221                             (asoc->sctp_cmt_on_off == 0)) {
13222                                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13223                                 queue_only = 1;
13224                         } else if (asoc->ifp_had_enobuf) {
13225                                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13226                                 if (net->flight_size > (2 * net->mtu)) {
13227                                         queue_only = 1;
13228                                 }
13229                                 asoc->ifp_had_enobuf = 0;
13230                         }
13231                         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13232                             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13233                         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13234                             (stcb->asoc.total_flight > 0) &&
13235                             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13236                             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13237 
13238                                 /*-
13239                                  * Ok, Nagle is set on and we have data outstanding.
13240                                  * Don't send anything and let SACKs drive out the
13241                                  * data unless we have a "full" segment to send.
13242                                  */
13243                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13244                                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13245                                 }
13246                                 SCTP_STAT_INCR(sctps_naglequeued);
13247                                 nagle_applies = 1;
13248                         } else {
13249                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13250                                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13251                                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13252                                 }
13253                                 SCTP_STAT_INCR(sctps_naglesent);
13254                                 nagle_applies = 0;
13255                         }
13256                         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13257 
13258                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13259                                     nagle_applies, un_sent);
13260                                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13261                                     stcb->asoc.total_flight,
13262                                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13263                         }
13264                         if (queue_only_for_init)
13265                                 queue_only_for_init = 0;
13266                         if ((queue_only == 0) && (nagle_applies == 0)) {
13267                                 /*-
13268                                  * need to start chunk output
13269                                  * before blocking.. note that if
13270                                  * a lock is already applied, then
13271                                  * the input via the net is happening
13272                                  * and I don't need to start output :-D
13273                                  */
13274                                 if (hold_tcblock == 0) {
13275                                         if (SCTP_TCB_TRYLOCK(stcb)) {
13276                                                 hold_tcblock = 1;
13277                                                 sctp_chunk_output(inp,
13278                                                     stcb,
13279                                                     SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13280                                         }
13281                                 } else {
13282                                         sctp_chunk_output(inp,
13283                                             stcb,
13284                                             SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13285                                 }
13286                                 if (hold_tcblock == 1) {
13287                                         SCTP_TCB_UNLOCK(stcb);
13288                                         hold_tcblock = 0;
13289                                 }
13290                         }
13291                         SOCKBUF_LOCK(&so->so_snd);
13292                         /*-
13293                          * This is a bit strange, but I think it will
13294                          * work. The total_output_queue_size is locked and
13295                          * protected by the TCB_LOCK, which we just released.
13296                          * There is a race that can occur between releasing it
13297                          * above, and me getting the socket lock, where sacks
13298                          * come in but we have not put the SB_WAIT on the
13299                          * so_snd buffer to get the wakeup. After the LOCK
13300                          * is applied the sack_processing will also need to
13301                          * LOCK the so->so_snd to do the actual sowwakeup(). So
13302                          * once we have the socket buffer lock if we recheck the
13303                          * size we KNOW we will get to sleep safely with the
13304                          * wakeup flag in place.
13305                          */
13306                         if (SCTP_SB_LIMIT_SND(so) <= (stcb->asoc.total_output_queue_size +
13307                             min(SCTP_BASE_SYSCTL(sctp_add_more_threshold), SCTP_SB_LIMIT_SND(so)))) {
13308                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13309                                         sctp_log_block(SCTP_BLOCK_LOG_INTO_BLK,
13310                                             asoc, uio->uio_resid);
13311                                 }
13312                                 be.error = 0;
13313                                 stcb->block_entry = &be;
13314                                 error = sbwait(&so->so_snd);
13315                                 stcb->block_entry = NULL;
13316 
13317                                 if (error || so->so_error || be.error) {
13318                                         if (error == 0) {
13319                                                 if (so->so_error)
13320                                                         error = so->so_error;
13321                                                 if (be.error) {
13322                                                         error = be.error;
13323                                                 }
13324                                         }
13325                                         SOCKBUF_UNLOCK(&so->so_snd);
13326                                         goto out_unlocked;
13327                                 }
13328                                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13329                                         sctp_log_block(SCTP_BLOCK_LOG_OUTOF_BLK,
13330                                             asoc, stcb->asoc.total_output_queue_size);
13331                                 }
13332                         }
13333                         SOCKBUF_UNLOCK(&so->so_snd);
13334                         if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
13335                                 goto out_unlocked;
13336                         }
13337                 }
13338                 SCTP_TCB_SEND_LOCK(stcb);
13339                 if (sp) {
13340                         if (sp->msg_is_complete == 0) {
13341                                 strm->last_msg_incomplete = 1;
13342                                 asoc->stream_locked = 1;
13343                                 asoc->stream_locked_on = srcv->sinfo_stream;
13344                         } else {
13345                                 sp->sender_all_done = 1;
13346                                 strm->last_msg_incomplete = 0;
13347                                 asoc->stream_locked = 0;
13348                         }
13349                 } else {
13350                         SCTP_PRINTF("Huh no sp TSNH?\n");
13351                         strm->last_msg_incomplete = 0;
13352                         asoc->stream_locked = 0;
13353                 }
13354                 SCTP_TCB_SEND_UNLOCK(stcb);
13355                 if (uio->uio_resid == 0) {
13356                         got_all_of_the_send = 1;
13357                 }
13358         } else {
13359                 /* We send in a 0, since we do NOT have any locks */
13360                 error = sctp_msg_append(stcb, net, top, srcv, 0);
13361                 top = NULL;
13362                 if (srcv->sinfo_flags & SCTP_EOF) {
13363                         /*
13364                          * This should only happen for Panda for the mbuf
13365                          * send case, which does NOT yet support EEOR mode.
13366                          * Thus, we can just set this flag to do the proper
13367                          * EOF handling.
13368                          */
13369                         got_all_of_the_send = 1;
13370                 }
13371         }
13372         if (error) {
13373                 goto out;
13374         }
13375 dataless_eof:
13376         /* EOF thing ? */
13377         if ((srcv->sinfo_flags & SCTP_EOF) &&
13378             (got_all_of_the_send == 1)) {
13379                 int cnt;
13380 
13381                 SCTP_STAT_INCR(sctps_sends_with_eof);
13382                 error = 0;
13383                 if (hold_tcblock == 0) {
13384                         SCTP_TCB_LOCK(stcb);
13385                         hold_tcblock = 1;
13386                 }
13387                 cnt = sctp_is_there_unsent_data(stcb, SCTP_SO_LOCKED);
13388                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13389                     TAILQ_EMPTY(&asoc->sent_queue) &&
13390                     (cnt == 0)) {
13391                         if (asoc->locked_on_sending) {
13392                                 goto abort_anyway;
13393                         }
13394                         /* there is nothing queued to send, so I'm done... */
13395                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13396                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13397                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13398                                 struct sctp_nets *netp;
13399 
13400                                 /* only send SHUTDOWN the first time through */
13401                                 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
13402                                         SCTP_STAT_DECR_GAUGE32(sctps_currestab);
13403                                 }
13404                                 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
13405                                 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
13406                                 sctp_stop_timers_for_shutdown(stcb);
13407                                 if (stcb->asoc.alternate) {
13408                                         netp = stcb->asoc.alternate;
13409                                 } else {
13410                                         netp = stcb->asoc.primary_destination;
13411                                 }
13412                                 sctp_send_shutdown(stcb, netp);
13413                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
13414                                     netp);
13415                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13416                                     asoc->primary_destination);
13417                         }
13418                 } else {
13419                         /*-
13420                          * we still got (or just got) data to send, so set
13421                          * SHUTDOWN_PENDING
13422                          */
13423                         /*-
13424                          * XXX sockets draft says that SCTP_EOF should be
13425                          * sent with no data.  currently, we will allow user
13426                          * data to be sent first and move to
13427                          * SHUTDOWN-PENDING
13428                          */
13429                         if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
13430                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
13431                             (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
13432                                 if (hold_tcblock == 0) {
13433                                         SCTP_TCB_LOCK(stcb);
13434                                         hold_tcblock = 1;
13435                                 }
13436                                 if (asoc->locked_on_sending) {
13437                                         /* Locked to send out the data */
13438                                         struct sctp_stream_queue_pending *sp;
13439 
13440                                         sp = TAILQ_LAST(&asoc->locked_on_sending->outqueue, sctp_streamhead);
13441                                         if (sp) {
13442                                                 if ((sp->length == 0) && (sp->msg_is_complete == 0))
13443                                                         asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
13444                                         }
13445                                 }
13446                                 asoc->state |= SCTP_STATE_SHUTDOWN_PENDING;
13447                                 if (TAILQ_EMPTY(&asoc->send_queue) &&
13448                                     TAILQ_EMPTY(&asoc->sent_queue) &&
13449                                     (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT)) {
13450                                         struct mbuf *op_err;
13451                                         char msg[SCTP_DIAG_INFO_LEN];
13452 
13453                         abort_anyway:
13454                                         if (free_cnt_applied) {
13455                                                 atomic_add_int(&stcb->asoc.refcnt, -1);
13456                                                 free_cnt_applied = 0;
13457                                         }
13458                                         snprintf(msg, sizeof(msg),
13459                                             "%s:%d at %s", __FILE__, __LINE__, __func__);
13460                                         op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
13461                                             msg);
13462                                         sctp_abort_an_association(stcb->sctp_ep, stcb,
13463                                             op_err, SCTP_SO_LOCKED);
13464                                         /*
13465                                          * now relock the stcb so everything
13466                                          * is sane
13467                                          */
13468                                         hold_tcblock = 0;
13469                                         stcb = NULL;
13470                                         goto out;
13471                                 }
13472                                 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb,
13473                                     asoc->primary_destination);
13474                                 sctp_feature_off(inp, SCTP_PCB_FLAGS_NODELAY);
13475                         }
13476                 }
13477         }
13478 skip_out_eof:
13479         if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
13480                 some_on_control = 1;
13481         }
13482         if (queue_only_for_init) {
13483                 if (hold_tcblock == 0) {
13484                         SCTP_TCB_LOCK(stcb);
13485                         hold_tcblock = 1;
13486                 }
13487                 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) {
13488                         /* a collision took us forward? */
13489                         queue_only = 0;
13490                 } else {
13491                         sctp_send_initiate(inp, stcb, SCTP_SO_LOCKED);
13492                         SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_WAIT);
13493                         queue_only = 1;
13494                 }
13495         }
13496         if ((net->flight_size > net->cwnd) &&
13497             (stcb->asoc.sctp_cmt_on_off == 0)) {
13498                 SCTP_STAT_INCR(sctps_send_cwnd_avoid);
13499                 queue_only = 1;
13500         } else if (asoc->ifp_had_enobuf) {
13501                 SCTP_STAT_INCR(sctps_ifnomemqueued);
13502                 if (net->flight_size > (2 * net->mtu)) {
13503                         queue_only = 1;
13504                 }
13505                 asoc->ifp_had_enobuf = 0;
13506         }
13507         un_sent = ((stcb->asoc.total_output_queue_size - stcb->asoc.total_flight) +
13508             (stcb->asoc.stream_queue_cnt * sizeof(struct sctp_data_chunk)));
13509         if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
13510             (stcb->asoc.total_flight > 0) &&
13511             (stcb->asoc.stream_queue_cnt < SCTP_MAX_DATA_BUNDLING) &&
13512             (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
13513                 /*-
13514                  * Ok, Nagle is set on and we have data outstanding.
13515                  * Don't send anything and let SACKs drive out the
13516                  * data unless wen have a "full" segment to send.
13517                  */
13518                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13519                         sctp_log_nagle_event(stcb, SCTP_NAGLE_APPLIED);
13520                 }
13521                 SCTP_STAT_INCR(sctps_naglequeued);
13522                 nagle_applies = 1;
13523         } else {
13524                 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_NAGLE_LOGGING_ENABLE) {
13525                         if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY))
13526                                 sctp_log_nagle_event(stcb, SCTP_NAGLE_SKIPPED);
13527                 }
13528                 SCTP_STAT_INCR(sctps_naglesent);
13529                 nagle_applies = 0;
13530         }
13531         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_BLK_LOGGING_ENABLE) {
13532                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, queue_only_for_init, queue_only,
13533                     nagle_applies, un_sent);
13534                 sctp_misc_ints(SCTP_CWNDLOG_PRESEND, stcb->asoc.total_output_queue_size,
13535                     stcb->asoc.total_flight,
13536                     stcb->asoc.chunks_on_out_queue, stcb->asoc.total_flight_count);
13537         }
13538         if ((queue_only == 0) && (nagle_applies == 0) && (stcb->asoc.peers_rwnd && un_sent)) {
13539                 /* we can attempt to send too. */
13540                 if (hold_tcblock == 0) {
13541                         /*
13542                          * If there is activity recv'ing sacks no need to
13543                          * send
13544                          */
13545                         if (SCTP_TCB_TRYLOCK(stcb)) {
13546                                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13547                                 hold_tcblock = 1;
13548                         }
13549                 } else {
13550                         sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13551                 }
13552         } else if ((queue_only == 0) &&
13553                     (stcb->asoc.peers_rwnd == 0) &&
13554             (stcb->asoc.total_flight == 0)) {
13555                 /* We get to have a probe outstanding */
13556                 if (hold_tcblock == 0) {
13557                         hold_tcblock = 1;
13558                         SCTP_TCB_LOCK(stcb);
13559                 }
13560                 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_USR_SEND, SCTP_SO_LOCKED);
13561         } else if (some_on_control) {
13562                 int num_out, reason, frag_point;
13563 
13564                 /* Here we do control only */
13565                 if (hold_tcblock == 0) {
13566                         hold_tcblock = 1;
13567                         SCTP_TCB_LOCK(stcb);
13568                 }
13569                 frag_point = sctp_get_frag_point(stcb, &stcb->asoc);
13570                 (void)sctp_med_chunk_output(inp, stcb, &stcb->asoc, &num_out,
13571                     &reason, 1, 1, &now, &now_filled, frag_point, SCTP_SO_LOCKED);
13572         }
13573         SCTPDBG(SCTP_DEBUG_OUTPUT1, "USR Send complete qo:%d prw:%d unsent:%d tf:%d cooq:%d toqs:%d err:%d\n",
13574             queue_only, stcb->asoc.peers_rwnd, un_sent,
13575             stcb->asoc.total_flight, stcb->asoc.chunks_on_out_queue,
13576             stcb->asoc.total_output_queue_size, error);
13577 
13578 out:
13579 out_unlocked:
13580 
13581         if (local_soresv && stcb) {
13582                 atomic_subtract_int(&stcb->asoc.sb_send_resv, sndlen);
13583         }
13584         if (create_lock_applied) {
13585                 SCTP_ASOC_CREATE_UNLOCK(inp);
13586         }
13587         if ((stcb) && hold_tcblock) {
13588                 SCTP_TCB_UNLOCK(stcb);
13589         }
13590         if (stcb && free_cnt_applied) {
13591                 atomic_add_int(&stcb->asoc.refcnt, -1);
13592         }
13593 #ifdef INVARIANTS
13594         if (stcb) {
13595                 if (mtx_owned(&stcb->tcb_mtx)) {
13596                         panic("Leaving with tcb mtx owned?");
13597                 }
13598                 if (mtx_owned(&stcb->tcb_send_mtx)) {
13599                         panic("Leaving with tcb send mtx owned?");
13600                 }
13601         }
13602 #endif
13603         if (top) {
13604                 sctp_m_freem(top);
13605         }
13606         if (control) {
13607                 sctp_m_freem(control);
13608         }
13609         return (error);
13610 }
13611 
13612 
13613 /*
13614  * generate an AUTHentication chunk, if required
13615  */
13616 struct mbuf *
13617 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
13618     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
13619     struct sctp_tcb *stcb, uint8_t chunk)
13620 {
13621         struct mbuf *m_auth;
13622         struct sctp_auth_chunk *auth;
13623         int chunk_len;
13624         struct mbuf *cn;
13625 
13626         if ((m_end == NULL) || (auth_ret == NULL) || (offset == NULL) ||
13627             (stcb == NULL))
13628                 return (m);
13629 
13630         if (stcb->asoc.auth_supported == 0) {
13631                 return (m);
13632         }
13633         /* does the requested chunk require auth? */
13634         if (!sctp_auth_is_required_chunk(chunk, stcb->asoc.peer_auth_chunks)) {
13635                 return (m);
13636         }
13637         m_auth = sctp_get_mbuf_for_msg(sizeof(*auth), 0, M_NOWAIT, 1, MT_HEADER);
13638         if (m_auth == NULL) {
13639                 /* no mbuf's */
13640                 return (m);
13641         }
13642         /* reserve some space if this will be the first mbuf */
13643         if (m == NULL)
13644                 SCTP_BUF_RESV_UF(m_auth, SCTP_MIN_OVERHEAD);
13645         /* fill in the AUTH chunk details */
13646         auth = mtod(m_auth, struct sctp_auth_chunk *);
13647         bzero(auth, sizeof(*auth));
13648         auth->ch.chunk_type = SCTP_AUTHENTICATION;
13649         auth->ch.chunk_flags = 0;
13650         chunk_len = sizeof(*auth) +
13651             sctp_get_hmac_digest_len(stcb->asoc.peer_hmac_id);
13652         auth->ch.chunk_length = htons(chunk_len);
13653         auth->hmac_id = htons(stcb->asoc.peer_hmac_id);
13654         /* key id and hmac digest will be computed and filled in upon send */
13655 
13656         /* save the offset where the auth was inserted into the chain */
13657         *offset = 0;
13658         for (cn = m; cn; cn = SCTP_BUF_NEXT(cn)) {
13659                 *offset += SCTP_BUF_LEN(cn);
13660         }
13661 
13662         /* update length and return pointer to the auth chunk */
13663         SCTP_BUF_LEN(m_auth) = chunk_len;
13664         m = sctp_copy_mbufchain(m_auth, m, m_end, 1, chunk_len, 0);
13665         if (auth_ret != NULL)
13666                 *auth_ret = auth;
13667 
13668         return (m);
13669 }
13670 
13671 #ifdef INET6
13672 int
13673 sctp_v6src_match_nexthop(struct sockaddr_in6 *src6, sctp_route_t * ro)
13674 {
13675         struct nd_prefix *pfx = NULL;
13676         struct nd_pfxrouter *pfxrtr = NULL;
13677         struct sockaddr_in6 gw6;
13678 
13679         if (ro == NULL || ro->ro_rt == NULL || src6->sin6_family != AF_INET6)
13680                 return (0);
13681 
13682         /* get prefix entry of address */
13683         LIST_FOREACH(pfx, &MODULE_GLOBAL(nd_prefix), ndpr_entry) {
13684                 if (pfx->ndpr_stateflags & NDPRF_DETACHED)
13685                         continue;
13686                 if (IN6_ARE_MASKED_ADDR_EQUAL(&pfx->ndpr_prefix.sin6_addr,
13687                     &src6->sin6_addr, &pfx->ndpr_mask))
13688                         break;
13689         }
13690         /* no prefix entry in the prefix list */
13691         if (pfx == NULL) {
13692                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "No prefix entry for ");
13693                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13694                 return (0);
13695         }
13696         SCTPDBG(SCTP_DEBUG_OUTPUT2, "v6src_match_nexthop(), Prefix entry is ");
13697         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)src6);
13698 
13699         /* search installed gateway from prefix entry */
13700         LIST_FOREACH(pfxrtr, &pfx->ndpr_advrtrs, pfr_entry) {
13701                 memset(&gw6, 0, sizeof(struct sockaddr_in6));
13702                 gw6.sin6_family = AF_INET6;
13703                 gw6.sin6_len = sizeof(struct sockaddr_in6);
13704                 memcpy(&gw6.sin6_addr, &pfxrtr->router->rtaddr,
13705                     sizeof(struct in6_addr));
13706                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "prefix router is ");
13707                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, (struct sockaddr *)&gw6);
13708                 SCTPDBG(SCTP_DEBUG_OUTPUT2, "installed router is ");
13709                 SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13710                 if (sctp_cmpaddr((struct sockaddr *)&gw6,
13711                     ro->ro_rt->rt_gateway)) {
13712                         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is installed\n");
13713                         return (1);
13714                 }
13715         }
13716         SCTPDBG(SCTP_DEBUG_OUTPUT2, "pfxrouter is not installed\n");
13717         return (0);
13718 }
13719 
13720 #endif
13721 
13722 int
13723 sctp_v4src_match_nexthop(struct sctp_ifa *sifa, sctp_route_t * ro)
13724 {
13725 #ifdef INET
13726         struct sockaddr_in *sin, *mask;
13727         struct ifaddr *ifa;
13728         struct in_addr srcnetaddr, gwnetaddr;
13729 
13730         if (ro == NULL || ro->ro_rt == NULL ||
13731             sifa->address.sa.sa_family != AF_INET) {
13732                 return (0);
13733         }
13734         ifa = (struct ifaddr *)sifa->ifa;
13735         mask = (struct sockaddr_in *)(ifa->ifa_netmask);
13736         sin = &sifa->address.sin;
13737         srcnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13738         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: src address is ");
13739         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, &sifa->address.sa);
13740         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", srcnetaddr.s_addr);
13741 
13742         sin = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
13743         gwnetaddr.s_addr = (sin->sin_addr.s_addr & mask->sin_addr.s_addr);
13744         SCTPDBG(SCTP_DEBUG_OUTPUT1, "match_nexthop4: nexthop is ");
13745         SCTPDBG_ADDR(SCTP_DEBUG_OUTPUT2, ro->ro_rt->rt_gateway);
13746         SCTPDBG(SCTP_DEBUG_OUTPUT1, "network address is %x\n", gwnetaddr.s_addr);
13747         if (srcnetaddr.s_addr == gwnetaddr.s_addr) {
13748                 return (1);
13749         }
13750 #endif
13751         return (0);
13752 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet/sctp_output.c

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