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 /* \summary: Stream Control Transmission Protocol (SCTP) printer */
  37
  38 #include <config.h>
  39
  40 #include "netdissect-stdinc.h"
  41
  42 #define ND_LONGJMP_FROM_TCHECK
  43 #include "netdissect.h"
  44 #include "addrtoname.h"
  45 #include "extract.h"
  46 #include "ip.h"
  47 #include "ip6.h"
  48
  49 /* Definitions from:
  50  *
  51  * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola
  52  *
  53  * Redistribution and use in source and binary forms, with or without
  54  * modification, are permitted provided that the following conditions
  55  * are met:
  56  *
  57  * 1. Redistributions of source code must retain the above copyright
  58  *    notice, this list of conditions and the following disclaimer.
  59  *
  60  * 2. Redistributions in binary form must reproduce the above copyright
  61  *    notice, this list of conditions and the following disclaimer in the
  62  *    documentation and/or other materials provided with the distribution.
  63  *
  64  * 3. Neither the name of Cisco nor of Motorola may be used
  65  *    to endorse or promote products derived from this software without
  66  *    specific prior written permission.
  67  *
  68  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  69  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  70  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  71  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  72  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  73  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  74  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  75  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  76  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  77  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  78  * SUCH DAMAGE.
  79  *
  80  * This file is part of the SCTP reference Implementation
  81  *
  82  *
  83  * Please send any bug reports or fixes you make to one of the following email
  84  * addresses:
  85  *
  86  * rstewar1@email.mot.com
  87  * kmorneau@cisco.com
  88  * qxie1@email.mot.com
  89  *
  90  * Any bugs reported given to us we will try to fix... any fixes shared will
  91  * be incorporated into the next SCTP release.
  92  */
  93
  94 /* The valid defines for all message
  95  * types know to SCTP. 0 is reserved
  96  */
  97 #define SCTP_DATA               0x00
  98 #define SCTP_INITIATION         0x01
  99 #define SCTP_INITIATION_ACK     0x02
 100 #define SCTP_SELECTIVE_ACK      0x03
 101 #define SCTP_HEARTBEAT_REQUEST  0x04
 102 #define SCTP_HEARTBEAT_ACK      0x05
 103 #define SCTP_ABORT_ASSOCIATION  0x06
 104 #define SCTP_SHUTDOWN           0x07
 105 #define SCTP_SHUTDOWN_ACK       0x08
 106 #define SCTP_OPERATION_ERR      0x09
 107 #define SCTP_COOKIE_ECHO        0x0a
 108 #define SCTP_COOKIE_ACK         0x0b
 109 #define SCTP_ECN_ECHO           0x0c
 110 #define SCTP_ECN_CWR            0x0d
 111 #define SCTP_SHUTDOWN_COMPLETE  0x0e
 112 #define SCTP_FORWARD_CUM_TSN    0xc0
 113 #define SCTP_RELIABLE_CNTL      0xc1
 114 #define SCTP_RELIABLE_CNTL_ACK  0xc2
 115
 116 static const struct tok sctp_chunkid_str[] = {
 117         { SCTP_DATA,              "DATA"              },
 118         { SCTP_INITIATION,        "INIT"              },
 119         { SCTP_INITIATION_ACK,    "INIT ACK"          },
 120         { SCTP_SELECTIVE_ACK,     "SACK"              },
 121         { SCTP_HEARTBEAT_REQUEST, "HB REQ"            },
 122         { SCTP_HEARTBEAT_ACK,     "HB ACK"            },
 123         { SCTP_ABORT_ASSOCIATION, "ABORT"             },
 124         { SCTP_SHUTDOWN,          "SHUTDOWN"          },
 125         { SCTP_SHUTDOWN_ACK,      "SHUTDOWN ACK"      },
 126         { SCTP_OPERATION_ERR,     "OP ERR"            },
 127         { SCTP_COOKIE_ECHO,       "COOKIE ECHO"       },
 128         { SCTP_COOKIE_ACK,        "COOKIE ACK"        },
 129         { SCTP_ECN_ECHO,          "ECN ECHO"          },
 130         { SCTP_ECN_CWR,           "ECN CWR"           },
 131         { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" },
 132         { SCTP_FORWARD_CUM_TSN,   "FOR CUM TSN"       },
 133         { SCTP_RELIABLE_CNTL,     "REL CTRL"          },
 134         { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK"      },
 135         { 0, NULL }
 136 };
 137
 138 /* Data Chuck Specific Flags */
 139 #define SCTP_DATA_FRAG_MASK     0x03
 140 #define SCTP_DATA_MIDDLE_FRAG   0x00
 141 #define SCTP_DATA_LAST_FRAG     0x01
 142 #define SCTP_DATA_FIRST_FRAG    0x02
 143 #define SCTP_DATA_NOT_FRAG      0x03
 144 #define SCTP_DATA_UNORDERED     0x04
 145
 146 #define SCTP_ADDRMAX 60
 147
 148 #define CHAN_HP 6704
 149 #define CHAN_MP 6705
 150 #define CHAN_LP 6706
 151
 152 /* the sctp common header */
 153
 154 struct sctpHeader{
 155   nd_uint16_t source;
 156   nd_uint16_t destination;
 157   nd_uint32_t verificationTag;
 158   nd_uint32_t adler32;
 159 };
 160
 161 /* various descriptor parsers */
 162
 163 struct sctpChunkDesc{
 164   nd_uint8_t  chunkID;
 165   nd_uint8_t  chunkFlg;
 166   nd_uint16_t chunkLength;
 167 };
 168
 169 struct sctpParamDesc{
 170   nd_uint16_t paramType;
 171   nd_uint16_t paramLength;
 172 };
 173
 174
 175 struct sctpRelChunkDesc{
 176   struct sctpChunkDesc chk;
 177   nd_uint32_t serialNumber;
 178 };
 179
 180 struct sctpVendorSpecificParam {
 181   struct sctpParamDesc p;  /* type must be 0xfffe */
 182   nd_uint32_t vendorId;    /* vendor ID from RFC 1700 */
 183   nd_uint16_t vendorSpecificType;
 184   nd_uint16_t vendorSpecificLen;
 185 };
 186
 187
 188 /* Structures for the control parts */
 189
 190
 191
 192 /* Sctp association init request/ack */
 193
 194 /* this is used for init ack, too */
 195 struct sctpInitiation{
 196   nd_uint32_t initTag;                  /* tag of mine */
 197   nd_uint32_t rcvWindowCredit;          /* rwnd */
 198   nd_uint16_t NumPreopenStreams;        /* OS */
 199   nd_uint16_t MaxInboundStreams;        /* MIS */
 200   nd_uint32_t initialTSN;
 201   /* optional param's follow in sctpParamDesc form */
 202 };
 203
 204 struct sctpV4IpAddress{
 205   struct sctpParamDesc p;       /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */
 206   nd_ipv4  ipAddress;
 207 };
 208
 209
 210 struct sctpV6IpAddress{
 211   struct sctpParamDesc p;       /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
 212   nd_ipv6  ipAddress;
 213 };
 214
 215 struct sctpDNSName{
 216   struct sctpParamDesc param;
 217   nd_byte name[1];
 218 };
 219
 220
 221 struct sctpCookiePreserve{
 222   struct sctpParamDesc p;       /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
 223   nd_uint32_t extraTime;
 224 };
 225
 226
 227 struct sctpTimeStamp{
 228   nd_uint32_t ts_sec;
 229   nd_uint32_t ts_usec;
 230 };
 231
 232
 233 /* this guy is for use when
 234  * I have a initiate message gloming the
 235  * things together.
 236
 237  */
 238 struct sctpUnifiedInit{
 239   struct sctpChunkDesc uh;
 240   struct sctpInitiation initm;
 241 };
 242
 243 struct sctpSendableInit{
 244   struct sctpHeader mh;
 245   struct sctpUnifiedInit msg;
 246 };
 247
 248
 249 /* Selective Acknowledgement
 250  * has the following structure with
 251  * a optional amount of trailing int's
 252  * on the last part (based on the numberOfDesc
 253  * field).
 254  */
 255
 256 struct sctpSelectiveAck{
 257   nd_uint32_t highestConseqTSN;
 258   nd_uint32_t updatedRwnd;
 259   nd_uint16_t numberOfdesc;
 260   nd_uint16_t numDupTsns;
 261 };
 262
 263 struct sctpSelectiveFrag{
 264   nd_uint16_t fragmentStart;
 265   nd_uint16_t fragmentEnd;
 266 };
 267
 268
 269 struct sctpUnifiedSack{
 270   struct sctpChunkDesc uh;
 271   struct sctpSelectiveAck sack;
 272 };
 273
 274 /* for the abort and shutdown ACK
 275  * we must carry the init tag in the common header. Just the
 276  * common header is all that is needed with a chunk descriptor.
 277  */
 278 struct sctpUnifiedAbort{
 279   struct sctpChunkDesc uh;
 280 };
 281
 282 struct sctpUnifiedAbortLight{
 283   struct sctpHeader mh;
 284   struct sctpChunkDesc uh;
 285 };
 286
 287 struct sctpUnifiedAbortHeavy{
 288   struct sctpHeader mh;
 289   struct sctpChunkDesc uh;
 290   nd_uint16_t causeCode;
 291   nd_uint16_t causeLen;
 292 };
 293
 294 /* For the graceful shutdown we must carry
 295  * the tag (in common header)  and the highest consecutive acking value
 296  */
 297 struct sctpShutdown {
 298   nd_uint32_t TSN_Seen;
 299 };
 300
 301 struct sctpUnifiedShutdown{
 302   struct sctpChunkDesc uh;
 303   struct sctpShutdown shut;
 304 };
 305
 306 /* in the unified message we add the trailing
 307  * stream id since it is the only message
 308  * that is defined as a operation error.
 309  */
 310 struct sctpOpErrorCause{
 311   nd_uint16_t cause;
 312   nd_uint16_t causeLen;
 313 };
 314
 315 struct sctpUnifiedOpError{
 316   struct sctpChunkDesc uh;
 317   struct sctpOpErrorCause c;
 318 };
 319
 320 struct sctpUnifiedStreamError{
 321   struct sctpHeader mh;
 322   struct sctpChunkDesc uh;
 323   struct sctpOpErrorCause c;
 324   nd_uint16_t strmNum;
 325   nd_uint16_t reserved;
 326 };
 327
 328 struct staleCookieMsg{
 329   struct sctpHeader mh;
 330   struct sctpChunkDesc uh;
 331   struct sctpOpErrorCause c;
 332   nd_uint32_t moretime;
 333 };
 334
 335 /* the following is used in all sends
 336  * where nothing is needed except the
 337  * chunk/type i.e. shutdownAck Abort */
 338
 339 struct sctpUnifiedSingleMsg{
 340   struct sctpHeader mh;
 341   struct sctpChunkDesc uh;
 342 };
 343
 344 struct sctpDataPart{
 345   nd_uint32_t TSN;
 346   nd_uint16_t streamId;
 347   nd_uint16_t sequence;
 348   nd_uint32_t payloadtype;
 349 };
 350
 351 struct sctpUnifiedDatagram{
 352   struct sctpChunkDesc uh;
 353   struct sctpDataPart dp;
 354 };
 355
 356 struct sctpECN_echo{
 357   struct sctpChunkDesc uh;
 358   nd_uint32_t Lowest_TSN;
 359 };
 360
 361
 362 struct sctpCWR{
 363   struct sctpChunkDesc uh;
 364   nd_uint32_t TSN_reduced_at;
 365 };
 366
 367 static const struct tok ForCES_channels[] = {
 368         { CHAN_HP, "ForCES HP" },
 369         { CHAN_MP, "ForCES MP" },
 370         { CHAN_LP, "ForCES LP" },
 371         { 0, NULL }
 372 };
 373
 374 /* data chunk's payload protocol identifiers */
 375
 376 #define SCTP_PPID_IUA 1
 377 #define SCTP_PPID_M2UA 2
 378 #define SCTP_PPID_M3UA 3
 379 #define SCTP_PPID_SUA 4
 380 #define SCTP_PPID_M2PA 5
 381 #define SCTP_PPID_V5UA 6
 382 #define SCTP_PPID_H248 7
 383 #define SCTP_PPID_BICC 8
 384 #define SCTP_PPID_TALI 9
 385 #define SCTP_PPID_DUA 10
 386 #define SCTP_PPID_ASAP 11
 387 #define SCTP_PPID_ENRP 12
 388 #define SCTP_PPID_H323 13
 389 #define SCTP_PPID_QIPC 14
 390 #define SCTP_PPID_SIMCO 15
 391 #define SCTP_PPID_DDPSC 16
 392 #define SCTP_PPID_DDPSSC 17
 393 #define SCTP_PPID_S1AP 18
 394 #define SCTP_PPID_RUA 19
 395 #define SCTP_PPID_HNBAP 20
 396 #define SCTP_PPID_FORCES_HP 21
 397 #define SCTP_PPID_FORCES_MP 22
 398 #define SCTP_PPID_FORCES_LP 23
 399 #define SCTP_PPID_SBC_AP 24
 400 #define SCTP_PPID_NBAP 25
 401 /* 26 */
 402 #define SCTP_PPID_X2AP 27
 403
 404 static const struct tok PayloadProto_idents[] = {
 405         { SCTP_PPID_IUA,    "ISDN Q.921" },
 406         { SCTP_PPID_M2UA,   "M2UA"   },
 407         { SCTP_PPID_M3UA,   "M3UA"   },
 408         { SCTP_PPID_SUA,    "SUA"    },
 409         { SCTP_PPID_M2PA,   "M2PA"   },
 410         { SCTP_PPID_V5UA,   "V5.2"   },
 411         { SCTP_PPID_H248,   "H.248"  },
 412         { SCTP_PPID_BICC,   "BICC"   },
 413         { SCTP_PPID_TALI,   "TALI"   },
 414         { SCTP_PPID_DUA,    "DUA"    },
 415         { SCTP_PPID_ASAP,   "ASAP"   },
 416         { SCTP_PPID_ENRP,   "ENRP"   },
 417         { SCTP_PPID_H323,   "H.323"  },
 418         { SCTP_PPID_QIPC,   "Q.IPC"  },
 419         { SCTP_PPID_SIMCO,  "SIMCO"  },
 420         { SCTP_PPID_DDPSC,  "DDPSC"  },
 421         { SCTP_PPID_DDPSSC, "DDPSSC" },
 422         { SCTP_PPID_S1AP,   "S1AP"   },
 423         { SCTP_PPID_RUA,    "RUA"    },
 424         { SCTP_PPID_HNBAP,  "HNBAP"  },
 425         { SCTP_PPID_FORCES_HP, "ForCES HP" },
 426         { SCTP_PPID_FORCES_MP, "ForCES MP" },
 427         { SCTP_PPID_FORCES_LP, "ForCES LP" },
 428         { SCTP_PPID_SBC_AP, "SBc-AP" },
 429         { SCTP_PPID_NBAP,   "NBAP"   },
 430         /* 26 */
 431         { SCTP_PPID_X2AP,   "X2AP"   },
 432         { 0, NULL }
 433 };
 434
 435
 436 static int
 437 isForCES_port(u_short Port)
 438 {
 439         if (Port == CHAN_HP)
 440                 return 1;
 441         if (Port == CHAN_MP)
 442                 return 1;
 443         if (Port == CHAN_LP)
 444                 return 1;
 445
 446         return 0;
 447 }
 448
 449 void
 450 sctp_print(netdissect_options *ndo,
 451            const u_char *bp,        /* beginning of sctp packet */
 452            const u_char *bp2,       /* beginning of enclosing */
 453            u_int sctpPacketLength)  /* sctp packet */
 454 {
 455   u_int sctpPacketLengthRemaining;
 456   const struct sctpHeader *sctpPktHdr;
 457   const struct ip *ip;
 458   const struct ip6_hdr *ip6;
 459   uint8_t chunkID;
 460   u_short sourcePort, destPort;
 461   u_int chunkCount;
 462   const struct sctpChunkDesc *chunkDescPtr;
 463   const char *sep;
 464   int isforces = 0;
 465
 466   ndo->ndo_protocol = "sctp";
 467   ND_ICHECKMSG_ZU("length", sctpPacketLength, <, sizeof(struct sctpHeader));
 468   sctpPktHdr = (const struct sctpHeader*) bp;
 469   ND_TCHECK_SIZE(sctpPktHdr);
 470   sctpPacketLengthRemaining = sctpPacketLength;
 471
 472   sourcePort = GET_BE_U_2(sctpPktHdr->source);
 473   destPort = GET_BE_U_2(sctpPktHdr->destination);
 474
 475   ip = (const struct ip *)bp2;
 476   if (IP_V(ip) == 6)
 477     ip6 = (const struct ip6_hdr *)bp2;
 478   else
 479     ip6 = NULL;
 480
 481   if (ip6) {
 482     ND_PRINT("%s.%u > %s.%u: sctp",
 483       GET_IP6ADDR_STRING(ip6->ip6_src),
 484       sourcePort,
 485       GET_IP6ADDR_STRING(ip6->ip6_dst),
 486       destPort);
 487   } else {
 488     ND_PRINT("%s.%u > %s.%u: sctp",
 489       GET_IPADDR_STRING(ip->ip_src),
 490       sourcePort,
 491       GET_IPADDR_STRING(ip->ip_dst),
 492       destPort);
 493   }
 494
 495   if (isForCES_port(sourcePort)) {
 496          ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, sourcePort));
 497          isforces = 1;
 498   }
 499   if (isForCES_port(destPort)) {
 500          ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, destPort));
 501          isforces = 1;
 502   }
 503
 504   bp += sizeof(struct sctpHeader);
 505   sctpPacketLengthRemaining -= sizeof(struct sctpHeader);
 506
 507   if (ndo->ndo_vflag >= 2)
 508     sep = "\n\t";
 509   else
 510     sep = " (";
 511   /* cycle through all chunks, printing information on each one */
 512   for (chunkCount = 0, chunkDescPtr = (const struct sctpChunkDesc *)bp;
 513       sctpPacketLengthRemaining != 0;
 514       chunkCount++)
 515     {
 516       uint16_t chunkLength, chunkLengthRemaining;
 517       uint16_t align;
 518
 519       chunkDescPtr = (const struct sctpChunkDesc *)bp;
 520       if (sctpPacketLengthRemaining < sizeof(*chunkDescPtr)) {
 521         ND_PRINT("%s%u) [chunk descriptor cut off at end of packet]", sep, chunkCount+1);
 522         break;
 523       }
 524       ND_TCHECK_SIZE(chunkDescPtr);
 525       chunkLength = GET_BE_U_2(chunkDescPtr->chunkLength);
 526       if (chunkLength < sizeof(*chunkDescPtr)) {
 527         ND_PRINT("%s%u) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength);
 528         break;
 529       }
 530       chunkLengthRemaining = chunkLength;
 531
 532       align = chunkLength % 4;
 533       if (align != 0)
 534         align = 4 - align;
 535
 536       if (sctpPacketLengthRemaining < align) {
 537         ND_PRINT("%s%u) [Bad chunk length %u, > remaining data in packet]", sep, chunkCount+1, chunkLength);
 538         break;
 539       }
 540
 541       ND_TCHECK_LEN(bp, chunkLength);
 542
 543       bp += sizeof(*chunkDescPtr);
 544       sctpPacketLengthRemaining -= sizeof(*chunkDescPtr);
 545       chunkLengthRemaining -= sizeof(*chunkDescPtr);
 546
 547       ND_PRINT("%s%u) ", sep, chunkCount+1);
 548       chunkID = GET_U_1(chunkDescPtr->chunkID);
 549       ND_PRINT("[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
 550                chunkID));
 551       switch (chunkID) {
 552         case SCTP_DATA :
 553           {
 554             const struct sctpDataPart *dataHdrPtr;
 555             uint8_t chunkFlg;
 556             uint32_t ppid;
 557             uint16_t payload_size;
 558
 559             chunkFlg = GET_U_1(chunkDescPtr->chunkFlg);
 560             if ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)
 561               ND_PRINT("(U)");
 562
 563             if ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG)
 564               ND_PRINT("(B)");
 565
 566             if ((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG)
 567               ND_PRINT("(E)");
 568
 569             if( ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED) ||
 570                 ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) ||
 571                 ((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) )
 572               ND_PRINT(" ");
 573
 574             ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <,
 575                             sizeof(*dataHdrPtr));
 576             dataHdrPtr=(const struct sctpDataPart*)bp;
 577
 578             ppid = GET_BE_U_4(dataHdrPtr->payloadtype);
 579             ND_PRINT("[TSN: %u] ", GET_BE_U_4(dataHdrPtr->TSN));
 580             ND_PRINT("[SID: %u] ", GET_BE_U_2(dataHdrPtr->streamId));
 581             ND_PRINT("[SSEQ %u] ", GET_BE_U_2(dataHdrPtr->sequence));
 582             ND_PRINT("[PPID %s] ",
 583                     tok2str(PayloadProto_idents, "0x%x", ppid));
 584
 585             if (!isforces) {
 586                 isforces = (ppid == SCTP_PPID_FORCES_HP) ||
 587                     (ppid == SCTP_PPID_FORCES_MP) ||
 588                     (ppid == SCTP_PPID_FORCES_LP);
 589             }
 590
 591             bp += sizeof(*dataHdrPtr);
 592             sctpPacketLengthRemaining -= sizeof(*dataHdrPtr);
 593             chunkLengthRemaining -= sizeof(*dataHdrPtr);
 594             ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, ==, 0);
 595             payload_size = chunkLengthRemaining;
 596
 597             if (isforces) {
 598                 forces_print(ndo, bp, payload_size);
 599                 /* ndo_protocol reassignment after forces_print() call */
 600                 ndo->ndo_protocol = "sctp";
 601             } else if (ndo->ndo_vflag >= 2) {   /* if verbose output is specified */
 602                                         /* at the command line */
 603                 switch (ppid) {
 604                 case SCTP_PPID_M3UA :
 605                         m3ua_print(ndo, bp, payload_size);
 606                         /* ndo_protocol reassignment after m3ua_print() call */
 607                         ndo->ndo_protocol = "sctp";
 608                         break;
 609                 default:
 610                         ND_PRINT("[Payload");
 611                         if (!ndo->ndo_suppress_default_print) {
 612                                 ND_PRINT(":");
 613                                 ND_DEFAULTPRINT(bp, payload_size);
 614                         }
 615                         ND_PRINT("]");
 616                         break;
 617                 }
 618             }
 619             bp += payload_size;
 620             sctpPacketLengthRemaining -= payload_size;
 621             chunkLengthRemaining -= payload_size;
 622             break;
 623           }
 624         case SCTP_INITIATION :
 625           {
 626             const struct sctpInitiation *init;
 627
 628             ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <,
 629                             sizeof(*init));
 630             init=(const struct sctpInitiation*)bp;
 631             ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag));
 632             ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit));
 633             ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams));
 634             ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams));
 635             ND_PRINT("[init TSN: %u] ", GET_BE_U_4(init->initialTSN));
 636             bp += sizeof(*init);
 637             sctpPacketLengthRemaining -= sizeof(*init);
 638             chunkLengthRemaining -= sizeof(*init);
 639
 640 #if 0 /* ALC you can add code for optional params here */
 641             if( chunkLengthRemaining != 0 )
 642               ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
 643                      "Optional params present, but not printed.");
 644 #endif
 645             bp += chunkLengthRemaining;
 646             sctpPacketLengthRemaining -= chunkLengthRemaining;
 647             chunkLengthRemaining = 0;
 648             break;
 649           }
 650         case SCTP_INITIATION_ACK :
 651           {
 652             const struct sctpInitiation *init;
 653
 654             ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <,
 655                             sizeof(*init));
 656             init=(const struct sctpInitiation*)bp;
 657             ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag));
 658             ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit));
 659             ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams));
 660             ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams));
 661             ND_PRINT("[init TSN: %u] ", GET_BE_U_4(init->initialTSN));
 662             bp += sizeof(*init);
 663             sctpPacketLengthRemaining -= sizeof(*init);
 664             chunkLengthRemaining -= sizeof(*init);
 665
 666 #if 0 /* ALC you can add code for optional params here */
 667             if( chunkLengthRemaining != 0 )
 668               ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
 669                      "Optional params present, but not printed.");
 670 #endif
 671             bp += chunkLengthRemaining;
 672             sctpPacketLengthRemaining -= chunkLengthRemaining;
 673             chunkLengthRemaining = 0;
 674             break;
 675           }
 676         case SCTP_SELECTIVE_ACK:
 677           {
 678             const struct sctpSelectiveAck *sack;
 679             const struct sctpSelectiveFrag *frag;
 680             u_int fragNo, tsnNo;
 681             const u_char *dupTSN;
 682
 683             ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <,
 684                             sizeof(*sack));
 685             sack=(const struct sctpSelectiveAck*)bp;
 686             ND_PRINT("[cum ack %u] ", GET_BE_U_4(sack->highestConseqTSN));
 687             ND_PRINT("[a_rwnd %u] ", GET_BE_U_4(sack->updatedRwnd));
 688             ND_PRINT("[#gap acks %u] ", GET_BE_U_2(sack->numberOfdesc));
 689             ND_PRINT("[#dup tsns %u] ", GET_BE_U_2(sack->numDupTsns));
 690             bp += sizeof(*sack);
 691             sctpPacketLengthRemaining -= sizeof(*sack);
 692             chunkLengthRemaining -= sizeof(*sack);
 693
 694
 695             /* print gaps */
 696             for (fragNo=0;
 697                  chunkLengthRemaining != 0 && fragNo < GET_BE_U_2(sack->numberOfdesc);
 698                  bp += sizeof(*frag), sctpPacketLengthRemaining -= sizeof(*frag), chunkLengthRemaining -= sizeof(*frag), fragNo++) {
 699               ND_ICHECKMSG_ZU("chunk length", chunkLengthRemaining, <,
 700                             sizeof(*frag));
 701               frag = (const struct sctpSelectiveFrag *)bp;
 702               ND_PRINT("\n\t\t[gap ack block #%u: start = %u, end = %u] ",
 703                      fragNo+1,
 704                      GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentStart),
 705                      GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentEnd));
 706             }
 707
 708             /* print duplicate TSNs */
 709             for (tsnNo=0;
 710                  chunkLengthRemaining != 0 && tsnNo<GET_BE_U_2(sack->numDupTsns);
 711                  bp += 4, sctpPacketLengthRemaining -= 4, chunkLengthRemaining -= 4, tsnNo++) {
 712               ND_ICHECKMSG_U("chunk length", chunkLengthRemaining, <, 4);
 713               dupTSN = (const u_char *)bp;
 714               ND_PRINT("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 715                        GET_BE_U_4(dupTSN));
 716             }
 717             break;
 718           }
 719         default :
 720           {
 721             bp += chunkLengthRemaining;
 722             sctpPacketLengthRemaining -= chunkLengthRemaining;
 723             chunkLengthRemaining = 0;
 724             break;
 725           }
 726         }
 727
 728       /*
 729        * Any extra stuff at the end of the chunk?
 730        * XXX - report this?
 731        */
 732       bp += chunkLengthRemaining;
 733       sctpPacketLengthRemaining -= chunkLengthRemaining;
 734
 735       if (ndo->ndo_vflag < 2)
 736         sep = ", (";
 737
 738       if (align != 0) {
 739         /*
 740          * Fail if the alignment padding isn't in the captured data.
 741          * Otherwise, skip it.
 742          */
 743         ND_TCHECK_LEN(bp, align);
 744         bp += align;
 745         sctpPacketLengthRemaining -= align;
 746       }
 747     }
 748     return;
 749 invalid:
 750     nd_print_invalid(ndo);
 751 }