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 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include <netdissect-stdinc.h>
  41
  42 #include "netdissect.h"
  43 #include "addrtoname.h"
  44 #include "extract.h"
  45 #include "ip.h"
  46 #include "ip6.h"
  47
  48 /* Definitions from:
  49  *
  50  * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola
  51  *
  52  * Redistribution and use in source and binary forms, with or without
  53  * modification, are permitted provided that the following conditions
  54  * are met:
  55  *
  56  * 1. Redistributions of source code must retain the above copyright
  57  *    notice, this list of conditions and the following disclaimer.
  58  *
  59  * 2. Redistributions in binary form must reproduce the above copyright
  60  *    notice, this list of conditions and the following disclaimer in the
  61  *    documentation and/or other materials provided with the distribution.
  62  *
  63  * 3. Neither the name of Cisco nor of Motorola may be used
  64  *    to endorse or promote products derived from this software without
  65  *    specific prior written permission.
  66  *
  67  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  68  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  69  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  70  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  71  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  72  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  73  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  74  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  75  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  76  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  77  * SUCH DAMAGE.
  78  *
  79  * This file is part of the SCTP reference Implementation
  80  *
  81  *
  82  * Please send any bug reports or fixes you make to one of the following email
  83  * addresses:
  84  *
  85  * rstewar1@email.mot.com
  86  * kmorneau@cisco.com
  87  * qxie1@email.mot.com
  88  *
  89  * Any bugs reported given to us we will try to fix... any fixes shared will
  90  * be incorperated into the next SCTP release.
  91  */
  92
  93 /* The valid defines for all message
  94  * types know to SCTP. 0 is reserved
  95  */
  96 #define SCTP_DATA               0x00
  97 #define SCTP_INITIATION         0x01
  98 #define SCTP_INITIATION_ACK     0x02
  99 #define SCTP_SELECTIVE_ACK      0x03
 100 #define SCTP_HEARTBEAT_REQUEST  0x04
 101 #define SCTP_HEARTBEAT_ACK      0x05
 102 #define SCTP_ABORT_ASSOCIATION  0x06
 103 #define SCTP_SHUTDOWN           0x07
 104 #define SCTP_SHUTDOWN_ACK       0x08
 105 #define SCTP_OPERATION_ERR      0x09
 106 #define SCTP_COOKIE_ECHO        0x0a
 107 #define SCTP_COOKIE_ACK         0x0b
 108 #define SCTP_ECN_ECHO           0x0c
 109 #define SCTP_ECN_CWR            0x0d
 110 #define SCTP_SHUTDOWN_COMPLETE  0x0e
 111 #define SCTP_FORWARD_CUM_TSN    0xc0
 112 #define SCTP_RELIABLE_CNTL      0xc1
 113 #define SCTP_RELIABLE_CNTL_ACK  0xc2
 114
 115 static const struct tok sctp_chunkid_str[] = {
 116         { SCTP_DATA,              "DATA"              },
 117         { SCTP_INITIATION,        "INIT"              },
 118         { SCTP_INITIATION_ACK,    "INIT ACK"          },
 119         { SCTP_SELECTIVE_ACK,     "SACK"              },
 120         { SCTP_HEARTBEAT_REQUEST, "HB REQ"            },
 121         { SCTP_HEARTBEAT_ACK,     "HB ACK"            },
 122         { SCTP_ABORT_ASSOCIATION, "ABORT"             },
 123         { SCTP_SHUTDOWN,          "SHUTDOWN"          },
 124         { SCTP_SHUTDOWN_ACK,      "SHUTDOWN ACK"      },
 125         { SCTP_OPERATION_ERR,     "OP ERR"            },
 126         { SCTP_COOKIE_ECHO,       "COOKIE ECHO"       },
 127         { SCTP_COOKIE_ACK,        "COOKIE ACK"        },
 128         { SCTP_ECN_ECHO,          "ECN ECHO"          },
 129         { SCTP_ECN_CWR,           "ECN CWR"           },
 130         { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" },
 131         { SCTP_FORWARD_CUM_TSN,   "FOR CUM TSN"       },
 132         { SCTP_RELIABLE_CNTL,     "REL CTRL"          },
 133         { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK"      },
 134         { 0, NULL }
 135 };
 136
 137 /* Data Chuck Specific Flags */
 138 #define SCTP_DATA_FRAG_MASK     0x03
 139 #define SCTP_DATA_MIDDLE_FRAG   0x00
 140 #define SCTP_DATA_LAST_FRAG     0x01
 141 #define SCTP_DATA_FIRST_FRAG    0x02
 142 #define SCTP_DATA_NOT_FRAG      0x03
 143 #define SCTP_DATA_UNORDERED     0x04
 144
 145 #define SCTP_ADDRMAX 60
 146
 147 #define CHAN_HP 6704
 148 #define CHAN_MP 6705
 149 #define CHAN_LP 6706
 150
 151 /* the sctp common header */
 152
 153 struct sctpHeader{
 154   uint16_t source;
 155   uint16_t destination;
 156   uint32_t verificationTag;
 157   uint32_t adler32;
 158 };
 159
 160 /* various descriptor parsers */
 161
 162 struct sctpChunkDesc{
 163   uint8_t chunkID;
 164   uint8_t chunkFlg;
 165   uint16_t chunkLength;
 166 };
 167
 168 struct sctpParamDesc{
 169   uint16_t paramType;
 170   uint16_t paramLength;
 171 };
 172
 173
 174 struct sctpRelChunkDesc{
 175   struct sctpChunkDesc chk;
 176   uint32_t serialNumber;
 177 };
 178
 179 struct sctpVendorSpecificParam {
 180   struct sctpParamDesc p;  /* type must be 0xfffe */
 181   uint32_t vendorId;       /* vendor ID from RFC 1700 */
 182   uint16_t vendorSpecificType;
 183   uint16_t vendorSpecificLen;
 184 };
 185
 186
 187 /* Structures for the control parts */
 188
 189
 190
 191 /* Sctp association init request/ack */
 192
 193 /* this is used for init ack, too */
 194 struct sctpInitiation{
 195   uint32_t initTag;             /* tag of mine */
 196   uint32_t rcvWindowCredit;     /* rwnd */
 197   uint16_t NumPreopenStreams;   /* OS */
 198   uint16_t MaxInboundStreams;     /* MIS */
 199   uint32_t initialTSN;
 200   /* optional param's follow in sctpParamDesc form */
 201 };
 202
 203 struct sctpV4IpAddress{
 204   struct sctpParamDesc p;       /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */
 205   uint32_t  ipAddress;
 206 };
 207
 208
 209 struct sctpV6IpAddress{
 210   struct sctpParamDesc p;       /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
 211   uint8_t  ipAddress[16];
 212 };
 213
 214 struct sctpDNSName{
 215   struct sctpParamDesc param;
 216   uint8_t name[1];
 217 };
 218
 219
 220 struct sctpCookiePreserve{
 221   struct sctpParamDesc p;       /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
 222   uint32_t extraTime;
 223 };
 224
 225
 226 struct sctpTimeStamp{
 227   uint32_t ts_sec;
 228   uint32_t ts_usec;
 229 };
 230
 231 /* wire structure of my cookie */
 232 struct cookieMessage{
 233   uint32_t TieTag_curTag;               /* copied from assoc if present */
 234   uint32_t TieTag_hisTag;               /* copied from assoc if present */
 235   int32_t cookieLife;                   /* life I will award this cookie */
 236   struct sctpTimeStamp timeEnteringState; /* the time I built cookie */
 237   struct sctpInitiation initAckISent;   /* the INIT-ACK that I sent to my peer */
 238   uint32_t addressWhereISent[4];        /* I make this 4 ints so I get 128bits for future */
 239   int32_t addrtype;                     /* address type */
 240   uint16_t locScope;                    /* V6 local scope flag */
 241   uint16_t siteScope;                   /* V6 site scope flag */
 242   /* at the end is tacked on the INIT chunk sent in
 243    * its entirety and of course our
 244    * signature.
 245    */
 246 };
 247
 248
 249 /* this guy is for use when
 250  * I have a initiate message gloming the
 251  * things together.
 252
 253  */
 254 struct sctpUnifiedInit{
 255   struct sctpChunkDesc uh;
 256   struct sctpInitiation initm;
 257 };
 258
 259 struct sctpSendableInit{
 260   struct sctpHeader mh;
 261   struct sctpUnifiedInit msg;
 262 };
 263
 264
 265 /* Selective Acknowledgement
 266  * has the following structure with
 267  * a optional ammount of trailing int's
 268  * on the last part (based on the numberOfDesc
 269  * field).
 270  */
 271
 272 struct sctpSelectiveAck{
 273   uint32_t highestConseqTSN;
 274   uint32_t updatedRwnd;
 275   uint16_t numberOfdesc;
 276   uint16_t numDupTsns;
 277 };
 278
 279 struct sctpSelectiveFrag{
 280   uint16_t fragmentStart;
 281   uint16_t fragmentEnd;
 282 };
 283
 284
 285 struct sctpUnifiedSack{
 286   struct sctpChunkDesc uh;
 287   struct sctpSelectiveAck sack;
 288 };
 289
 290 /* for both RTT request/response the
 291  * following is sent
 292  */
 293
 294 struct sctpHBrequest {
 295   uint32_t time_value_1;
 296   uint32_t time_value_2;
 297 };
 298
 299 /* here is what I read and respond with to. */
 300 struct sctpHBunified{
 301   struct sctpChunkDesc hdr;
 302   struct sctpParamDesc hb;
 303 };
 304
 305
 306 /* here is what I send */
 307 struct sctpHBsender{
 308   struct sctpChunkDesc hdr;
 309   struct sctpParamDesc hb;
 310   struct sctpHBrequest rtt;
 311   int8_t addrFmt[SCTP_ADDRMAX];
 312   uint16_t userreq;
 313 };
 314
 315
 316
 317 /* for the abort and shutdown ACK
 318  * we must carry the init tag in the common header. Just the
 319  * common header is all that is needed with a chunk descriptor.
 320  */
 321 struct sctpUnifiedAbort{
 322   struct sctpChunkDesc uh;
 323 };
 324
 325 struct sctpUnifiedAbortLight{
 326   struct sctpHeader mh;
 327   struct sctpChunkDesc uh;
 328 };
 329
 330 struct sctpUnifiedAbortHeavy{
 331   struct sctpHeader mh;
 332   struct sctpChunkDesc uh;
 333   uint16_t causeCode;
 334   uint16_t causeLen;
 335 };
 336
 337 /* For the graceful shutdown we must carry
 338  * the tag (in common header)  and the highest consequitive acking value
 339  */
 340 struct sctpShutdown {
 341   uint32_t TSN_Seen;
 342 };
 343
 344 struct sctpUnifiedShutdown{
 345   struct sctpChunkDesc uh;
 346   struct sctpShutdown shut;
 347 };
 348
 349 /* in the unified message we add the trailing
 350  * stream id since it is the only message
 351  * that is defined as a operation error.
 352  */
 353 struct sctpOpErrorCause{
 354   uint16_t cause;
 355   uint16_t causeLen;
 356 };
 357
 358 struct sctpUnifiedOpError{
 359   struct sctpChunkDesc uh;
 360   struct sctpOpErrorCause c;
 361 };
 362
 363 struct sctpUnifiedStreamError{
 364   struct sctpHeader mh;
 365   struct sctpChunkDesc uh;
 366   struct sctpOpErrorCause c;
 367   uint16_t strmNum;
 368   uint16_t reserved;
 369 };
 370
 371 struct staleCookieMsg{
 372   struct sctpHeader mh;
 373   struct sctpChunkDesc uh;
 374   struct sctpOpErrorCause c;
 375   uint32_t moretime;
 376 };
 377
 378 /* the following is used in all sends
 379  * where nothing is needed except the
 380  * chunk/type i.e. shutdownAck Abort */
 381
 382 struct sctpUnifiedSingleMsg{
 383   struct sctpHeader mh;
 384   struct sctpChunkDesc uh;
 385 };
 386
 387 struct sctpDataPart{
 388   uint32_t TSN;
 389   uint16_t streamId;
 390   uint16_t sequence;
 391   uint32_t payloadtype;
 392 };
 393
 394 struct sctpUnifiedDatagram{
 395   struct sctpChunkDesc uh;
 396   struct sctpDataPart dp;
 397 };
 398
 399 struct sctpECN_echo{
 400   struct sctpChunkDesc uh;
 401   uint32_t Lowest_TSN;
 402 };
 403
 404
 405 struct sctpCWR{
 406   struct sctpChunkDesc uh;
 407   uint32_t TSN_reduced_at;
 408 };
 409
 410 static const struct tok ForCES_channels[] = {
 411         { CHAN_HP, "ForCES HP" },
 412         { CHAN_MP, "ForCES MP" },
 413         { CHAN_LP, "ForCES LP" },
 414         { 0, NULL }
 415 };
 416
 417 /* data chunk's payload protocol identifiers */
 418
 419 #define SCTP_PPID_IUA 1
 420 #define SCTP_PPID_M2UA 2
 421 #define SCTP_PPID_M3UA 3
 422 #define SCTP_PPID_SUA 4
 423 #define SCTP_PPID_M2PA 5
 424 #define SCTP_PPID_V5UA 6
 425 #define SCTP_PPID_H248 7
 426 #define SCTP_PPID_BICC 8
 427 #define SCTP_PPID_TALI 9
 428 #define SCTP_PPID_DUA 10
 429 #define SCTP_PPID_ASAP 11
 430 #define SCTP_PPID_ENRP 12
 431 #define SCTP_PPID_H323 13
 432 #define SCTP_PPID_QIPC 14
 433 #define SCTP_PPID_SIMCO 15
 434 #define SCTP_PPID_DDPSC 16
 435 #define SCTP_PPID_DDPSSC 17
 436 #define SCTP_PPID_S1AP 18
 437 #define SCTP_PPID_RUA 19
 438 #define SCTP_PPID_HNBAP 20
 439 #define SCTP_PPID_FORCES_HP 21
 440 #define SCTP_PPID_FORCES_MP 22
 441 #define SCTP_PPID_FORCES_LP 23
 442 #define SCTP_PPID_SBC_AP 24
 443 #define SCTP_PPID_NBAP 25
 444 /* 26 */
 445 #define SCTP_PPID_X2AP 27
 446
 447 static const struct tok PayloadProto_idents[] = {
 448         { SCTP_PPID_IUA,    "ISDN Q.921" },
 449         { SCTP_PPID_M2UA,   "M2UA"   },
 450         { SCTP_PPID_M3UA,   "M3UA"   },
 451         { SCTP_PPID_SUA,    "SUA"    },
 452         { SCTP_PPID_M2PA,   "M2PA"   },
 453         { SCTP_PPID_V5UA,   "V5.2"   },
 454         { SCTP_PPID_H248,   "H.248"  },
 455         { SCTP_PPID_BICC,   "BICC"   },
 456         { SCTP_PPID_TALI,   "TALI"   },
 457         { SCTP_PPID_DUA,    "DUA"    },
 458         { SCTP_PPID_ASAP,   "ASAP"   },
 459         { SCTP_PPID_ENRP,   "ENRP"   },
 460         { SCTP_PPID_H323,   "H.323"  },
 461         { SCTP_PPID_QIPC,   "Q.IPC"  },
 462         { SCTP_PPID_SIMCO,  "SIMCO"  },
 463         { SCTP_PPID_DDPSC,  "DDPSC"  },
 464         { SCTP_PPID_DDPSSC, "DDPSSC" },
 465         { SCTP_PPID_S1AP,   "S1AP"   },
 466         { SCTP_PPID_RUA,    "RUA"    },
 467         { SCTP_PPID_HNBAP,  "HNBAP"  },
 468         { SCTP_PPID_FORCES_HP, "ForCES HP" },
 469         { SCTP_PPID_FORCES_MP, "ForCES MP" },
 470         { SCTP_PPID_FORCES_LP, "ForCES LP" },
 471         { SCTP_PPID_SBC_AP, "SBc-AP" },
 472         { SCTP_PPID_NBAP,   "NBAP"   },
 473         /* 26 */
 474         { SCTP_PPID_X2AP,   "X2AP"   },
 475         { 0, NULL }
 476 };
 477
 478
 479 static inline int isForCES_port(u_short Port)
 480 {
 481         if (Port == CHAN_HP)
 482                 return 1;
 483         if (Port == CHAN_MP)
 484                 return 1;
 485         if (Port == CHAN_LP)
 486                 return 1;
 487
 488         return 0;
 489 }
 490
 491 void sctp_print(netdissect_options *ndo,
 492                 const u_char *bp,        /* beginning of sctp packet */
 493                 const u_char *bp2,       /* beginning of enclosing */
 494                 u_int sctpPacketLength)  /* ip packet */
 495 {
 496   u_int sctpPacketLengthRemaining;
 497   const struct sctpHeader *sctpPktHdr;
 498   const struct ip *ip;
 499   const struct ip6_hdr *ip6;
 500   u_short sourcePort, destPort;
 501   int chunkCount;
 502   const struct sctpChunkDesc *chunkDescPtr;
 503   const char *sep;
 504   int isforces = 0;
 505
 506   if (sctpPacketLength < sizeof(struct sctpHeader))
 507     {
 508       ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!",
 509                    (long)(sizeof(struct sctpHeader) - sctpPacketLength)));
 510       return;
 511     }
 512   sctpPktHdr = (const struct sctpHeader*) bp;
 513   ND_TCHECK(*sctpPktHdr);
 514   sctpPacketLengthRemaining = sctpPacketLength;
 515
 516   sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
 517   destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
 518
 519   ip = (const struct ip *)bp2;
 520   if (IP_V(ip) == 6)
 521     ip6 = (const struct ip6_hdr *)bp2;
 522   else
 523     ip6 = NULL;
 524
 525   if (ip6) {
 526     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 527       ip6addr_string(ndo, &ip6->ip6_src),
 528       sourcePort,
 529       ip6addr_string(ndo, &ip6->ip6_dst),
 530       destPort));
 531   } else
 532   {
 533     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 534       ipaddr_string(ndo, &ip->ip_src),
 535       sourcePort,
 536       ipaddr_string(ndo, &ip->ip_dst),
 537       destPort));
 538   }
 539
 540   if (isForCES_port(sourcePort)) {
 541          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort)));
 542          isforces = 1;
 543   }
 544   if (isForCES_port(destPort)) {
 545          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort)));
 546          isforces = 1;
 547   }
 548
 549   bp += sizeof(struct sctpHeader);
 550   sctpPacketLengthRemaining -= sizeof(struct sctpHeader);
 551
 552   if (ndo->ndo_vflag >= 2)
 553     sep = "\n\t";
 554   else
 555     sep = " (";
 556   /* cycle through all chunks, printing information on each one */
 557   for (chunkCount = 0, chunkDescPtr = (const struct sctpChunkDesc *)bp;
 558       sctpPacketLengthRemaining != 0;
 559       chunkCount++)
 560     {
 561       uint16_t chunkLength, chunkLengthRemaining;
 562       uint16_t align;
 563
 564       chunkDescPtr = (const struct sctpChunkDesc *)bp;
 565       if (sctpPacketLengthRemaining < sizeof(*chunkDescPtr)) {
 566         ND_PRINT((ndo, "%s%d) [chunk descriptor cut off at end of packet]", sep, chunkCount+1));
 567         break;
 568       }
 569       ND_TCHECK(*chunkDescPtr);
 570       chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
 571       if (chunkLength < sizeof(*chunkDescPtr)) {
 572         ND_PRINT((ndo, "%s%d) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength));
 573         break;
 574       }
 575       chunkLengthRemaining = chunkLength;
 576
 577       align = chunkLength % 4;
 578       if (align != 0)
 579         align = 4 - align;
 580
 581       if (sctpPacketLengthRemaining < align) {
 582         ND_PRINT((ndo, "%s%d) [Bad chunk length %u, > remaining data in packet]", sep, chunkCount+1, chunkLength));
 583         break;
 584       }
 585
 586       ND_TCHECK2(*bp, chunkLength);
 587
 588       bp += sizeof(*chunkDescPtr);
 589       sctpPacketLengthRemaining -= sizeof(*chunkDescPtr);
 590       chunkLengthRemaining -= sizeof(*chunkDescPtr);
 591
 592       ND_PRINT((ndo, "%s%d) ", sep, chunkCount+1));
 593       ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
 594                                       chunkDescPtr->chunkID)));
 595       switch (chunkDescPtr->chunkID)
 596         {
 597         case SCTP_DATA :
 598           {
 599             const struct sctpDataPart *dataHdrPtr;
 600             uint32_t ppid;
 601             u_int payload_size;
 602
 603             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 604                 == SCTP_DATA_UNORDERED)
 605               ND_PRINT((ndo, "(U)"));
 606
 607             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 608                 == SCTP_DATA_FIRST_FRAG)
 609               ND_PRINT((ndo, "(B)"));
 610
 611             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 612                 == SCTP_DATA_LAST_FRAG)
 613               ND_PRINT((ndo, "(E)"));
 614
 615             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 616                  == SCTP_DATA_UNORDERED)
 617                 ||
 618                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 619                  == SCTP_DATA_FIRST_FRAG)
 620                 ||
 621                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 622                  == SCTP_DATA_LAST_FRAG) )
 623               ND_PRINT((ndo, " "));
 624
 625             if (chunkLengthRemaining < sizeof(*dataHdrPtr)) {
 626                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 627                 return;
 628             }
 629             dataHdrPtr=(const struct sctpDataPart*)bp;
 630
 631             ppid = EXTRACT_32BITS(&dataHdrPtr->payloadtype);
 632             ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN)));
 633             ND_PRINT((ndo, "[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId)));
 634             ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence)));
 635             ND_PRINT((ndo, "[PPID %s] ",
 636                     tok2str(PayloadProto_idents, "0x%x", ppid)));
 637
 638             if (!isforces) {
 639                 isforces = (ppid == SCTP_PPID_FORCES_HP) ||
 640                     (ppid == SCTP_PPID_FORCES_MP) ||
 641                     (ppid == SCTP_PPID_FORCES_LP);
 642             }
 643
 644             bp += sizeof(*dataHdrPtr);
 645             sctpPacketLengthRemaining -= sizeof(*dataHdrPtr);
 646             chunkLengthRemaining -= sizeof(*dataHdrPtr);
 647             payload_size = chunkLengthRemaining;
 648             if (payload_size == 0) {
 649                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 650                 return;
 651             }
 652
 653             if (isforces) {
 654                 forces_print(ndo, bp, payload_size);
 655             } else if (ndo->ndo_vflag >= 2) {   /* if verbose output is specified */
 656                                         /* at the command line */
 657                 switch (ppid) {
 658                 case SCTP_PPID_M3UA :
 659                         m3ua_print(ndo, bp, payload_size);
 660                         break;
 661                 default:
 662                         ND_PRINT((ndo, "[Payload"));
 663                         if (!ndo->ndo_suppress_default_print) {
 664                                 ND_PRINT((ndo, ":"));
 665                                 ND_DEFAULTPRINT(bp, payload_size);
 666                         }
 667                         ND_PRINT((ndo, "]"));
 668                         break;
 669                 }
 670             }
 671             bp += payload_size;
 672             sctpPacketLengthRemaining -= payload_size;
 673             chunkLengthRemaining -= payload_size;
 674             break;
 675           }
 676         case SCTP_INITIATION :
 677           {
 678             const struct sctpInitiation *init;
 679
 680             if (chunkLengthRemaining < sizeof(*init)) {
 681                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 682                 return;
 683             }
 684             init=(const struct sctpInitiation*)bp;
 685             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 686             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 687             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 688             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 689             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 690             bp += sizeof(*init);
 691             sctpPacketLengthRemaining -= sizeof(*init);
 692             chunkLengthRemaining -= sizeof(*init);
 693
 694 #if(0) /* ALC you can add code for optional params here */
 695             if( chunkLengthRemaining != 0 )
 696               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 697                      "Optional params present, but not printed."));
 698 #endif
 699             bp += chunkLengthRemaining;
 700             sctpPacketLengthRemaining -= chunkLengthRemaining;
 701             chunkLengthRemaining = 0;
 702             break;
 703           }
 704         case SCTP_INITIATION_ACK :
 705           {
 706             const struct sctpInitiation *init;
 707
 708             if (chunkLengthRemaining < sizeof(*init)) {
 709                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 710                 return;
 711             }
 712             init=(const struct sctpInitiation*)bp;
 713             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 714             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 715             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 716             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 717             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 718             bp += sizeof(*init);
 719             sctpPacketLengthRemaining -= sizeof(*init);
 720             chunkLengthRemaining -= sizeof(*init);
 721
 722 #if(0) /* ALC you can add code for optional params here */
 723             if( chunkLengthRemaining != 0 )
 724               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 725                      "Optional params present, but not printed."));
 726 #endif
 727             bp += chunkLengthRemaining;
 728             sctpPacketLengthRemaining -= chunkLengthRemaining;
 729             chunkLengthRemaining = 0;
 730             break;
 731           }
 732         case SCTP_SELECTIVE_ACK:
 733           {
 734             const struct sctpSelectiveAck *sack;
 735             const struct sctpSelectiveFrag *frag;
 736             int fragNo, tsnNo;
 737             const u_char *dupTSN;
 738
 739             if (chunkLengthRemaining < sizeof(*sack)) {
 740               ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 741               return;
 742             }
 743             sack=(const struct sctpSelectiveAck*)bp;
 744             ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN)));
 745             ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd)));
 746             ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc)));
 747             ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns)));
 748             bp += sizeof(*sack);
 749             sctpPacketLengthRemaining -= sizeof(*sack);
 750             chunkLengthRemaining -= sizeof(*sack);
 751
 752
 753             /* print gaps */
 754             for (fragNo=0;
 755                  chunkLengthRemaining != 0 && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 756                  bp += sizeof(*frag), sctpPacketLengthRemaining -= sizeof(*frag), chunkLengthRemaining -= sizeof(*frag), fragNo++) {
 757               if (chunkLengthRemaining < sizeof(*frag)) {
 758                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 759                 return;
 760               }
 761               frag = (const struct sctpSelectiveFrag *)bp;
 762               ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 763                      fragNo+1,
 764                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 765                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd)));
 766             }
 767
 768             /* print duplicate TSNs */
 769             for (tsnNo=0;
 770                  chunkLengthRemaining != 0 && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 771                  bp += 4, sctpPacketLengthRemaining -= 4, chunkLengthRemaining -= 4, tsnNo++) {
 772               if (chunkLengthRemaining < 4) {
 773                 ND_PRINT((ndo, "bogus chunk length %u]", chunkLength));
 774                 return;
 775               }
 776               dupTSN = (const u_char *)bp;
 777               ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 778                 EXTRACT_32BITS(dupTSN)));
 779             }
 780             break;
 781           }
 782         default :
 783           {
 784             bp += chunkLengthRemaining;
 785             sctpPacketLengthRemaining -= chunkLengthRemaining;
 786             chunkLengthRemaining = 0;
 787             break;
 788           }
 789         }
 790
 791       /*
 792        * Any extra stuff at the end of the chunk?
 793        * XXX - report this?
 794        */
 795       bp += chunkLengthRemaining;
 796       sctpPacketLengthRemaining -= chunkLengthRemaining;
 797
 798       if (ndo->ndo_vflag < 2)
 799         sep = ", (";
 800
 801       if (align != 0) {
 802         /*
 803          * Fail if the alignment padding isn't in the captured data.
 804          * Otherwise, skip it.
 805          */
 806         ND_TCHECK2(*bp, align);
 807         bp += align;
 808         sctpPacketLengthRemaining -= align;
 809       }
 810     }
 811     return;
 812
 813 trunc:
 814     ND_PRINT((ndo, "[|sctp]"));
 815 }