The Tcpdump Group git mirrors - tcpdump/blob - print-sctp.c

   1 /* Copyright (c) 2001 NETLAB, Temple University
   2  * Copyright (c) 2001 Protocol Engineering Lab, University of Delaware
   3  *
   4  * Jerry Heinz <gheinz@astro.temple.edu>
   5  * John Fiore <jfiore@joda.cis.temple.edu>
   6  * Armando L. Caro Jr. <acaro@cis.udel.edu>
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the University nor of the Laboratory may be used
  20  *    to endorse or promote products derived from this software without
  21  *    specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #define NETDISSECT_REWORKED
  37 #ifdef HAVE_CONFIG_H
  38 #include "config.h"
  39 #endif
  40
  41 #include <tcpdump-stdinc.h>
  42
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "extract.h"                    /* must come after interface.h */
  46 #include "ip.h"
  47 #ifdef INET6
  48 #include "ip6.h"
  49 #endif
  50
  51 /* Definitions from:
  52  *
  53  * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola
  54  *
  55  * Redistribution and use in source and binary forms, with or without
  56  * modification, are permitted provided that the following conditions
  57  * are met:
  58  *
  59  * 1. Redistributions of source code must retain the above copyright
  60  *    notice, this list of conditions and the following disclaimer.
  61  *
  62  * 2. Redistributions in binary form must reproduce the above copyright
  63  *    notice, this list of conditions and the following disclaimer in the
  64  *    documentation and/or other materials provided with the distribution.
  65  *
  66  * 3. Neither the name of Cisco nor of Motorola may be used
  67  *    to endorse or promote products derived from this software without
  68  *    specific prior written permission.
  69  *
  70  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  71  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  72  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  73  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  74  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  75  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  76  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  77  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  78  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  79  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  80  * SUCH DAMAGE.
  81  *
  82  * This file is part of the SCTP reference Implementation
  83  *
  84  *
  85  * Please send any bug reports or fixes you make to one of the following email
  86  * addresses:
  87  *
  88  * rstewar1@email.mot.com
  89  * kmorneau@cisco.com
  90  * qxie1@email.mot.com
  91  *
  92  * Any bugs reported given to us we will try to fix... any fixes shared will
  93  * be incorperated into the next SCTP release.
  94  */
  95
  96 /* The valid defines for all message
  97  * types know to SCTP. 0 is reserved
  98  */
  99 #define SCTP_DATA               0x00
 100 #define SCTP_INITIATION         0x01
 101 #define SCTP_INITIATION_ACK     0x02
 102 #define SCTP_SELECTIVE_ACK      0x03
 103 #define SCTP_HEARTBEAT_REQUEST  0x04
 104 #define SCTP_HEARTBEAT_ACK      0x05
 105 #define SCTP_ABORT_ASSOCIATION  0x06
 106 #define SCTP_SHUTDOWN           0x07
 107 #define SCTP_SHUTDOWN_ACK       0x08
 108 #define SCTP_OPERATION_ERR      0x09
 109 #define SCTP_COOKIE_ECHO        0x0a
 110 #define SCTP_COOKIE_ACK         0x0b
 111 #define SCTP_ECN_ECHO           0x0c
 112 #define SCTP_ECN_CWR            0x0d
 113 #define SCTP_SHUTDOWN_COMPLETE  0x0e
 114 #define SCTP_FORWARD_CUM_TSN    0xc0
 115 #define SCTP_RELIABLE_CNTL      0xc1
 116 #define SCTP_RELIABLE_CNTL_ACK  0xc2
 117
 118 static const struct tok sctp_chunkid_str[] = {
 119         { SCTP_DATA,              "DATA"              },
 120         { SCTP_INITIATION,        "INIT"              },
 121         { SCTP_INITIATION_ACK,    "INIT ACK"          },
 122         { SCTP_SELECTIVE_ACK,     "SACK"              },
 123         { SCTP_HEARTBEAT_REQUEST, "HB REQ"            },
 124         { SCTP_HEARTBEAT_ACK,     "HB ACK"            },
 125         { SCTP_ABORT_ASSOCIATION, "ABORT"             },
 126         { SCTP_SHUTDOWN,          "SHUTDOWN"          },
 127         { SCTP_SHUTDOWN_ACK,      "SHUTDOWN ACK"      },
 128         { SCTP_OPERATION_ERR,     "OP ERR"            },
 129         { SCTP_COOKIE_ECHO,       "COOKIE ECHO"       },
 130         { SCTP_COOKIE_ACK,        "COOKIE ACK"        },
 131         { SCTP_ECN_ECHO,          "ECN ECHO"          },
 132         { SCTP_ECN_CWR,           "ECN CWR"           },
 133         { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" },
 134         { SCTP_FORWARD_CUM_TSN,   "FOR CUM TSN"       },
 135         { SCTP_RELIABLE_CNTL,     "REL CTRL"          },
 136         { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK"      },
 137         { 0, NULL }
 138 };
 139
 140 /* Data Chuck Specific Flags */
 141 #define SCTP_DATA_FRAG_MASK     0x03
 142 #define SCTP_DATA_MIDDLE_FRAG   0x00
 143 #define SCTP_DATA_LAST_FRAG     0x01
 144 #define SCTP_DATA_FIRST_FRAG    0x02
 145 #define SCTP_DATA_NOT_FRAG      0x03
 146 #define SCTP_DATA_UNORDERED     0x04
 147
 148 #define SCTP_ADDRMAX 60
 149
 150 #define CHAN_HP 6704
 151 #define CHAN_MP 6705
 152 #define CHAN_LP 6706
 153
 154 /* the sctp common header */
 155
 156 struct sctpHeader{
 157   u_int16_t source;
 158   u_int16_t destination;
 159   u_int32_t verificationTag;
 160   u_int32_t adler32;
 161 };
 162
 163 /* various descriptor parsers */
 164
 165 struct sctpChunkDesc{
 166   u_int8_t chunkID;
 167   u_int8_t chunkFlg;
 168   u_int16_t chunkLength;
 169 };
 170
 171 struct sctpParamDesc{
 172   u_int16_t paramType;
 173   u_int16_t paramLength;
 174 };
 175
 176
 177 struct sctpRelChunkDesc{
 178   struct sctpChunkDesc chk;
 179   u_int32_t serialNumber;
 180 };
 181
 182 struct sctpVendorSpecificParam {
 183   struct sctpParamDesc p;  /* type must be 0xfffe */
 184   u_int32_t vendorId;      /* vendor ID from RFC 1700 */
 185   u_int16_t vendorSpecificType;
 186   u_int16_t vendorSpecificLen;
 187 };
 188
 189
 190 /* Structures for the control parts */
 191
 192
 193
 194 /* Sctp association init request/ack */
 195
 196 /* this is used for init ack, too */
 197 struct sctpInitiation{
 198   u_int32_t initTag;            /* tag of mine */
 199   u_int32_t rcvWindowCredit;    /* rwnd */
 200   u_int16_t NumPreopenStreams;  /* OS */
 201   u_int16_t MaxInboundStreams;     /* MIS */
 202   u_int32_t initialTSN;
 203   /* optional param's follow in sctpParamDesc form */
 204 };
 205
 206 struct sctpV4IpAddress{
 207   struct sctpParamDesc p;       /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */
 208   u_int32_t  ipAddress;
 209 };
 210
 211
 212 struct sctpV6IpAddress{
 213   struct sctpParamDesc p;       /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
 214   u_int8_t  ipAddress[16];
 215 };
 216
 217 struct sctpDNSName{
 218   struct sctpParamDesc param;
 219   u_int8_t name[1];
 220 };
 221
 222
 223 struct sctpCookiePreserve{
 224   struct sctpParamDesc p;       /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
 225   u_int32_t extraTime;
 226 };
 227
 228
 229 struct sctpTimeStamp{
 230   u_int32_t ts_sec;
 231   u_int32_t ts_usec;
 232 };
 233
 234 /* wire structure of my cookie */
 235 struct cookieMessage{
 236   u_int32_t TieTag_curTag;              /* copied from assoc if present */
 237   u_int32_t TieTag_hisTag;              /* copied from assoc if present */
 238   int32_t cookieLife;                   /* life I will award this cookie */
 239   struct sctpTimeStamp timeEnteringState; /* the time I built cookie */
 240   struct sctpInitiation initAckISent;   /* the INIT-ACK that I sent to my peer */
 241   u_int32_t addressWhereISent[4];       /* I make this 4 ints so I get 128bits for future */
 242   int32_t addrtype;                     /* address type */
 243   u_int16_t locScope;                   /* V6 local scope flag */
 244   u_int16_t siteScope;                  /* V6 site scope flag */
 245   /* at the end is tacked on the INIT chunk sent in
 246    * its entirety and of course our
 247    * signature.
 248    */
 249 };
 250
 251
 252 /* this guy is for use when
 253  * I have a initiate message gloming the
 254  * things together.
 255
 256  */
 257 struct sctpUnifiedInit{
 258   struct sctpChunkDesc uh;
 259   struct sctpInitiation initm;
 260 };
 261
 262 struct sctpSendableInit{
 263   struct sctpHeader mh;
 264   struct sctpUnifiedInit msg;
 265 };
 266
 267
 268 /* Selective Acknowledgement
 269  * has the following structure with
 270  * a optional ammount of trailing int's
 271  * on the last part (based on the numberOfDesc
 272  * field).
 273  */
 274
 275 struct sctpSelectiveAck{
 276   u_int32_t highestConseqTSN;
 277   u_int32_t updatedRwnd;
 278   u_int16_t numberOfdesc;
 279   u_int16_t numDupTsns;
 280 };
 281
 282 struct sctpSelectiveFrag{
 283   u_int16_t fragmentStart;
 284   u_int16_t fragmentEnd;
 285 };
 286
 287
 288 struct sctpUnifiedSack{
 289   struct sctpChunkDesc uh;
 290   struct sctpSelectiveAck sack;
 291 };
 292
 293 /* for both RTT request/response the
 294  * following is sent
 295  */
 296
 297 struct sctpHBrequest {
 298   u_int32_t time_value_1;
 299   u_int32_t time_value_2;
 300 };
 301
 302 /* here is what I read and respond with to. */
 303 struct sctpHBunified{
 304   struct sctpChunkDesc hdr;
 305   struct sctpParamDesc hb;
 306 };
 307
 308
 309 /* here is what I send */
 310 struct sctpHBsender{
 311   struct sctpChunkDesc hdr;
 312   struct sctpParamDesc hb;
 313   struct sctpHBrequest rtt;
 314   int8_t addrFmt[SCTP_ADDRMAX];
 315   u_int16_t userreq;
 316 };
 317
 318
 319
 320 /* for the abort and shutdown ACK
 321  * we must carry the init tag in the common header. Just the
 322  * common header is all that is needed with a chunk descriptor.
 323  */
 324 struct sctpUnifiedAbort{
 325   struct sctpChunkDesc uh;
 326 };
 327
 328 struct sctpUnifiedAbortLight{
 329   struct sctpHeader mh;
 330   struct sctpChunkDesc uh;
 331 };
 332
 333 struct sctpUnifiedAbortHeavy{
 334   struct sctpHeader mh;
 335   struct sctpChunkDesc uh;
 336   u_int16_t causeCode;
 337   u_int16_t causeLen;
 338 };
 339
 340 /* For the graceful shutdown we must carry
 341  * the tag (in common header)  and the highest consequitive acking value
 342  */
 343 struct sctpShutdown {
 344   u_int32_t TSN_Seen;
 345 };
 346
 347 struct sctpUnifiedShutdown{
 348   struct sctpChunkDesc uh;
 349   struct sctpShutdown shut;
 350 };
 351
 352 /* in the unified message we add the trailing
 353  * stream id since it is the only message
 354  * that is defined as a operation error.
 355  */
 356 struct sctpOpErrorCause{
 357   u_int16_t cause;
 358   u_int16_t causeLen;
 359 };
 360
 361 struct sctpUnifiedOpError{
 362   struct sctpChunkDesc uh;
 363   struct sctpOpErrorCause c;
 364 };
 365
 366 struct sctpUnifiedStreamError{
 367   struct sctpHeader mh;
 368   struct sctpChunkDesc uh;
 369   struct sctpOpErrorCause c;
 370   u_int16_t strmNum;
 371   u_int16_t reserved;
 372 };
 373
 374 struct staleCookieMsg{
 375   struct sctpHeader mh;
 376   struct sctpChunkDesc uh;
 377   struct sctpOpErrorCause c;
 378   u_int32_t moretime;
 379 };
 380
 381 /* the following is used in all sends
 382  * where nothing is needed except the
 383  * chunk/type i.e. shutdownAck Abort */
 384
 385 struct sctpUnifiedSingleMsg{
 386   struct sctpHeader mh;
 387   struct sctpChunkDesc uh;
 388 };
 389
 390 struct sctpDataPart{
 391   u_int32_t TSN;
 392   u_int16_t streamId;
 393   u_int16_t sequence;
 394   u_int32_t payloadtype;
 395 };
 396
 397 struct sctpUnifiedDatagram{
 398   struct sctpChunkDesc uh;
 399   struct sctpDataPart dp;
 400 };
 401
 402 struct sctpECN_echo{
 403   struct sctpChunkDesc uh;
 404   u_int32_t Lowest_TSN;
 405 };
 406
 407
 408 struct sctpCWR{
 409   struct sctpChunkDesc uh;
 410   u_int32_t TSN_reduced_at;
 411 };
 412
 413 static const struct tok ForCES_channels[] = {
 414         { CHAN_HP, "ForCES HP" },
 415         { CHAN_MP, "ForCES MP" },
 416         { CHAN_LP, "ForCES LP" },
 417         { 0, NULL }
 418 };
 419
 420 static inline int isForCES_port(u_short Port)
 421 {
 422         if (Port == CHAN_HP)
 423                 return 1;
 424         if (Port == CHAN_MP)
 425                 return 1;
 426         if (Port == CHAN_LP)
 427                 return 1;
 428
 429         return 0;
 430 }
 431
 432 void sctp_print(netdissect_options *ndo,
 433                 const u_char *bp,        /* beginning of sctp packet */
 434                 const u_char *bp2,       /* beginning of enclosing */
 435                 u_int sctpPacketLength)  /* ip packet */
 436 {
 437   const struct sctpHeader *sctpPktHdr;
 438   const struct ip *ip;
 439 #ifdef INET6
 440   const struct ip6_hdr *ip6;
 441 #endif
 442   const void *endPacketPtr;
 443   u_short sourcePort, destPort;
 444   int chunkCount;
 445   const struct sctpChunkDesc *chunkDescPtr;
 446   const void *nextChunk;
 447   const char *sep;
 448   int isforces = 0;
 449
 450
 451   sctpPktHdr = (const struct sctpHeader*) bp;
 452   endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
 453
 454   if( (u_long) endPacketPtr > (u_long) ndo->ndo_snapend)
 455     endPacketPtr = (const void *) ndo->ndo_snapend;
 456   ip = (struct ip *)bp2;
 457 #ifdef INET6
 458   if (IP_V(ip) == 6)
 459     ip6 = (const struct ip6_hdr *)bp2;
 460   else
 461     ip6 = NULL;
 462 #endif /*INET6*/
 463   ND_TCHECK(*sctpPktHdr);
 464
 465   if (sctpPacketLength < sizeof(struct sctpHeader))
 466     {
 467       ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!",
 468                    (long)sctpPacketLength-sizeof(struct sctpHeader)));
 469       return;
 470     }
 471
 472   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 473   /*                          is now only as long as the payload  */
 474
 475   sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
 476   destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
 477
 478 #ifdef INET6
 479   if (ip6) {
 480     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 481       ip6addr_string(ndo, &ip6->ip6_src),
 482       sourcePort,
 483       ip6addr_string(ndo, &ip6->ip6_dst),
 484       destPort));
 485   } else
 486 #endif /*INET6*/
 487   {
 488     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 489       ipaddr_string(ndo, &ip->ip_src),
 490       sourcePort,
 491       ipaddr_string(ndo, &ip->ip_dst),
 492       destPort));
 493   }
 494
 495   if (isForCES_port(sourcePort)) {
 496          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort)));
 497          isforces = 1;
 498   }
 499   if (isForCES_port(destPort)) {
 500          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort)));
 501          isforces = 1;
 502   }
 503
 504   if (ndo->ndo_vflag >= 2)
 505     sep = "\n\t";
 506   else
 507     sep = " (";
 508   /* cycle through all chunks, printing information on each one */
 509   for (chunkCount = 0,
 510          chunkDescPtr = (const struct sctpChunkDesc *)
 511             ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
 512        chunkDescPtr != NULL &&
 513          ( (const void *)
 514             ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 515            <= endPacketPtr);
 516
 517        chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
 518     {
 519       u_int16_t chunkLength;
 520       const u_char *chunkEnd;
 521       u_int16_t align;
 522
 523       ND_TCHECK(*chunkDescPtr);
 524       chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
 525       if (chunkLength < sizeof(*chunkDescPtr)) {
 526         ND_PRINT((ndo, "%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength));
 527         break;
 528       }
 529
 530       ND_TCHECK2(*((u_int8_t *)chunkDescPtr), chunkLength);
 531       chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
 532
 533       align=chunkLength % 4;
 534       if (align != 0)
 535         align = 4 - align;
 536
 537       nextChunk = (const void *) (chunkEnd + align);
 538
 539       ND_PRINT((ndo, "%s%d) ", sep, chunkCount+1));
 540       ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
 541                                       chunkDescPtr->chunkID)));
 542       switch (chunkDescPtr->chunkID)
 543         {
 544         case SCTP_DATA :
 545           {
 546             const struct sctpDataPart *dataHdrPtr;
 547
 548             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 549                 == SCTP_DATA_UNORDERED)
 550               ND_PRINT((ndo, "(U)"));
 551
 552             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 553                 == SCTP_DATA_FIRST_FRAG)
 554               ND_PRINT((ndo, "(B)"));
 555
 556             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 557                 == SCTP_DATA_LAST_FRAG)
 558               ND_PRINT((ndo, "(E)"));
 559
 560             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 561                  == SCTP_DATA_UNORDERED)
 562                 ||
 563                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 564                  == SCTP_DATA_FIRST_FRAG)
 565                 ||
 566                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 567                  == SCTP_DATA_LAST_FRAG) )
 568               ND_PRINT((ndo, " "));
 569
 570             dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
 571
 572             ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN)));
 573             ND_PRINT((ndo, "[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId)));
 574             ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence)));
 575             ND_PRINT((ndo, "[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype)));
 576             if (isforces) {
 577                 const u_char *payloadPtr;
 578                 u_int chunksize = sizeof(struct sctpDataPart)+
 579                                   sizeof(struct sctpChunkDesc);
 580                 payloadPtr = (const u_char *) (dataHdrPtr + 1);
 581                 if (EXTRACT_16BITS(&chunkDescPtr->chunkLength) <
 582                         sizeof(struct sctpDataPart)+
 583                         sizeof(struct sctpChunkDesc)+1) {
 584                 /* Less than 1 byte of chunk payload */
 585                         ND_PRINT((ndo, "bogus ForCES chunk length %u]",
 586                             EXTRACT_16BITS(&chunkDescPtr->chunkLength)));
 587                         return;
 588                 }
 589
 590                 forces_print(ndo, payloadPtr, EXTRACT_16BITS(&chunkDescPtr->chunkLength)- chunksize);
 591            } else if (ndo->ndo_vflag >= 2) {    /* if verbose output is specified */
 592                                         /* at the command line */
 593                 const u_char *payloadPtr;
 594
 595                 ND_PRINT((ndo, "[Payload"));
 596
 597                 if (!ndo->ndo_suppress_default_print) {
 598                         payloadPtr = (const u_char *) (++dataHdrPtr);
 599                         ND_PRINT((ndo, ":"));
 600                         if (EXTRACT_16BITS(&chunkDescPtr->chunkLength) <
 601                             sizeof(struct sctpDataPart)+
 602                             sizeof(struct sctpChunkDesc)+1) {
 603                                 /* Less than 1 byte of chunk payload */
 604                                 ND_PRINT((ndo, "bogus chunk length %u]",
 605                                     EXTRACT_16BITS(&chunkDescPtr->chunkLength)));
 606                                 return;
 607                         }
 608                         ND_DEFAULTPRINT(payloadPtr,
 609                               EXTRACT_16BITS(&chunkDescPtr->chunkLength) -
 610                               (sizeof(struct sctpDataPart)+
 611                               sizeof(struct sctpChunkDesc)));
 612                 } else
 613                         ND_PRINT((ndo, "]"));
 614               }
 615             break;
 616           }
 617         case SCTP_INITIATION :
 618           {
 619             const struct sctpInitiation *init;
 620
 621             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 622             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 623             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 624             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 625             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 626             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 627
 628 #if(0) /* ALC you can add code for optional params here */
 629             if( (init+1) < chunkEnd )
 630               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 631                      "Optional params present, but not printed."));
 632 #endif
 633             break;
 634           }
 635         case SCTP_INITIATION_ACK :
 636           {
 637             const struct sctpInitiation *init;
 638
 639             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 640             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 641             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 642             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 643             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 644             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 645
 646 #if(0) /* ALC you can add code for optional params here */
 647             if( (init+1) < chunkEnd )
 648               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 649                      "Optional params present, but not printed."));
 650 #endif
 651             break;
 652           }
 653         case SCTP_SELECTIVE_ACK:
 654           {
 655             const struct sctpSelectiveAck *sack;
 656             const struct sctpSelectiveFrag *frag;
 657             int fragNo, tsnNo;
 658             const u_char *dupTSN;
 659
 660             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 661             ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN)));
 662             ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd)));
 663             ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc)));
 664             ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns)));
 665
 666
 667             /* print gaps */
 668             for (frag = ( (const struct sctpSelectiveFrag *)
 669                           ((const struct sctpSelectiveAck *) sack+1)),
 670                    fragNo=0;
 671                  (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 672                  frag++, fragNo++)
 673               ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 674                      fragNo+1,
 675                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 676                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd)));
 677
 678
 679             /* print duplicate TSNs */
 680             for (dupTSN = (const u_char *)frag, tsnNo=0;
 681                  (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 682                  dupTSN += 4, tsnNo++)
 683               ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 684                   EXTRACT_32BITS(dupTSN)));
 685
 686             break;
 687           }
 688         }
 689
 690         if (ndo->ndo_vflag < 2)
 691           sep = ", (";
 692     }
 693     return;
 694
 695 trunc:
 696     ND_PRINT((ndo, "[|sctp]"));
 697 }