The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_output.c

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *    this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *    the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/sctp_output.c 296052 2016-02-25 18:46:06Z tuexen $");
   35 
   36 #include <netinet/sctp_os.h>
   37 #include <sys/proc.h>
   38 #include <netinet/sctp_var.h>
   39 #include <netinet/sctp_sysctl.h>
   40 #include <netinet/sctp_header.h>
   41 #include <netinet/sctp_pcb.h>
   42 #include <netinet/sctputil.h>
   43 #include <netinet/sctp_output.h>
   44 #include <netinet/sctp_uio.h>
   45 #include <netinet/sctputil.h>
   46 #include <netinet/sctp_auth.h>
   47 #include <netinet/sctp_timer.h>
   48 #include <netinet/sctp_asconf.h>
   49 #include <netinet/sctp_indata.h>
   50 #include <netinet/sctp_bsd_addr.h>
   51 #include <netinet/sctp_input.h>
   52 #include <netinet/sctp_crc32.h>
   53 #if defined(INET) || defined(INET6)
   54 #include <netinet/udp.h>
   55 #endif
   56 #include <netinet/udp_var.h>
   57 #include <machine/in_cksum.h>
   58 
   59 
   60 
   61 #define SCTP_MAX_GAPS_INARRAY 4
   62 struct sack_track {
   63         uint8_t right_edge;     /* mergable on the right edge */
   64         uint8_t left_edge;      /* mergable on the left edge */
   65         uint8_t num_entries;
   66         uint8_t spare;
   67         struct sctp_gap_ack_block gaps[SCTP_MAX_GAPS_INARRAY];
   68 };
   69 
   70 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