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 #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 incorporated 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   nd_uint16_t source;
 155   nd_uint16_t destination;
 156   nd_uint32_t verificationTag;
 157   nd_uint32_t adler32;
 158 };
 159
 160 /* various descriptor parsers */
 161
 162 struct sctpChunkDesc{
 163   nd_uint8_t  chunkID;
 164   nd_uint8_t  chunkFlg;
 165   nd_uint16_t chunkLength;
 166 };
 167
 168 struct sctpParamDesc{
 169   nd_uint16_t paramType;
 170   nd_uint16_t paramLength;
 171 };
 172
 173
 174 struct sctpRelChunkDesc{
 175   struct sctpChunkDesc chk;
 176   nd_uint32_t serialNumber;
 177 };
 178
 179 struct sctpVendorSpecificParam {
 180   struct sctpParamDesc p;  /* type must be 0xfffe */
 181   nd_uint32_t vendorId;    /* vendor ID from RFC 1700 */
 182   nd_uint16_t vendorSpecificType;
 183   nd_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   nd_uint32_t initTag;                  /* tag of mine */
 196   nd_uint32_t rcvWindowCredit;          /* rwnd */
 197   nd_uint16_t NumPreopenStreams;        /* OS */
 198   nd_uint16_t MaxInboundStreams;        /* MIS */
 199   nd_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   nd_ipv4  ipAddress;
 206 };
 207
 208
 209 struct sctpV6IpAddress{
 210   struct sctpParamDesc p;       /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
 211   nd_ipv6  ipAddress;
 212 };
 213
 214 struct sctpDNSName{
 215   struct sctpParamDesc param;
 216   nd_byte name[1];
 217 };
 218
 219
 220 struct sctpCookiePreserve{
 221   struct sctpParamDesc p;       /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
 222   nd_uint32_t extraTime;
 223 };
 224
 225
 226 struct sctpTimeStamp{
 227   nd_uint32_t ts_sec;
 228   nd_uint32_t ts_usec;
 229 };
 230
 231
 232 /* this guy is for use when
 233  * I have a initiate message gloming the
 234  * things together.
 235
 236  */
 237 struct sctpUnifiedInit{
 238   struct sctpChunkDesc uh;
 239   struct sctpInitiation initm;
 240 };
 241
 242 struct sctpSendableInit{
 243   struct sctpHeader mh;
 244   struct sctpUnifiedInit msg;
 245 };
 246
 247
 248 /* Selective Acknowledgement
 249  * has the following structure with
 250  * a optional amount of trailing int's
 251  * on the last part (based on the numberOfDesc
 252  * field).
 253  */
 254
 255 struct sctpSelectiveAck{
 256   nd_uint32_t highestConseqTSN;
 257   nd_uint32_t updatedRwnd;
 258   nd_uint16_t numberOfdesc;
 259   nd_uint16_t numDupTsns;
 260 };
 261
 262 struct sctpSelectiveFrag{
 263   nd_uint16_t fragmentStart;
 264   nd_uint16_t fragmentEnd;
 265 };
 266
 267
 268 struct sctpUnifiedSack{
 269   struct sctpChunkDesc uh;
 270   struct sctpSelectiveAck sack;
 271 };
 272
 273 /* for the abort and shutdown ACK
 274  * we must carry the init tag in the common header. Just the
 275  * common header is all that is needed with a chunk descriptor.
 276  */
 277 struct sctpUnifiedAbort{
 278   struct sctpChunkDesc uh;
 279 };
 280
 281 struct sctpUnifiedAbortLight{
 282   struct sctpHeader mh;
 283   struct sctpChunkDesc uh;
 284 };
 285
 286 struct sctpUnifiedAbortHeavy{
 287   struct sctpHeader mh;
 288   struct sctpChunkDesc uh;
 289   nd_uint16_t causeCode;
 290   nd_uint16_t causeLen;
 291 };
 292
 293 /* For the graceful shutdown we must carry
 294  * the tag (in common header)  and the highest consecutive acking value
 295  */
 296 struct sctpShutdown {
 297   nd_uint32_t TSN_Seen;
 298 };
 299
 300 struct sctpUnifiedShutdown{
 301   struct sctpChunkDesc uh;
 302   struct sctpShutdown shut;
 303 };
 304
 305 /* in the unified message we add the trailing
 306  * stream id since it is the only message
 307  * that is defined as a operation error.
 308  */
 309 struct sctpOpErrorCause{
 310   nd_uint16_t cause;
 311   nd_uint16_t causeLen;
 312 };
 313
 314 struct sctpUnifiedOpError{
 315   struct sctpChunkDesc uh;
 316   struct sctpOpErrorCause c;
 317 };
 318
 319 struct sctpUnifiedStreamError{
 320   struct sctpHeader mh;
 321   struct sctpChunkDesc uh;
 322   struct sctpOpErrorCause c;
 323   nd_uint16_t strmNum;
 324   nd_uint16_t reserved;
 325 };
 326
 327 struct staleCookieMsg{
 328   struct sctpHeader mh;
 329   struct sctpChunkDesc uh;
 330   struct sctpOpErrorCause c;
 331   nd_uint32_t moretime;
 332 };
 333
 334 /* the following is used in all sends
 335  * where nothing is needed except the
 336  * chunk/type i.e. shutdownAck Abort */
 337
 338 struct sctpUnifiedSingleMsg{
 339   struct sctpHeader mh;
 340   struct sctpChunkDesc uh;
 341 };
 342
 343 struct sctpDataPart{
 344   nd_uint32_t TSN;
 345   nd_uint16_t streamId;
 346   nd_uint16_t sequence;
 347   nd_uint32_t payloadtype;
 348 };
 349
 350 struct sctpUnifiedDatagram{
 351   struct sctpChunkDesc uh;
 352   struct sctpDataPart dp;
 353 };
 354
 355 struct sctpECN_echo{
 356   struct sctpChunkDesc uh;
 357   nd_uint32_t Lowest_TSN;
 358 };
 359
 360
 361 struct sctpCWR{
 362   struct sctpChunkDesc uh;
 363   nd_uint32_t TSN_reduced_at;
 364 };
 365
 366 static const struct tok ForCES_channels[] = {
 367         { CHAN_HP, "ForCES HP" },
 368         { CHAN_MP, "ForCES MP" },
 369         { CHAN_LP, "ForCES LP" },
 370         { 0, NULL }
 371 };
 372
 373 /* data chunk's payload protocol identifiers */
 374
 375 #define SCTP_PPID_IUA 1
 376 #define SCTP_PPID_M2UA 2
 377 #define SCTP_PPID_M3UA 3
 378 #define SCTP_PPID_SUA 4
 379 #define SCTP_PPID_M2PA 5
 380 #define SCTP_PPID_V5UA 6
 381 #define SCTP_PPID_H248 7
 382 #define SCTP_PPID_BICC 8
 383 #define SCTP_PPID_TALI 9
 384 #define SCTP_PPID_DUA 10
 385 #define SCTP_PPID_ASAP 11
 386 #define SCTP_PPID_ENRP 12
 387 #define SCTP_PPID_H323 13
 388 #define SCTP_PPID_QIPC 14
 389 #define SCTP_PPID_SIMCO 15
 390 #define SCTP_PPID_DDPSC 16
 391 #define SCTP_PPID_DDPSSC 17
 392 #define SCTP_PPID_S1AP 18
 393 #define SCTP_PPID_RUA 19
 394 #define SCTP_PPID_HNBAP 20
 395 #define SCTP_PPID_FORCES_HP 21
 396 #define SCTP_PPID_FORCES_MP 22
 397 #define SCTP_PPID_FORCES_LP 23
 398 #define SCTP_PPID_SBC_AP 24
 399 #define SCTP_PPID_NBAP 25
 400 /* 26 */
 401 #define SCTP_PPID_X2AP 27
 402
 403 static const struct tok PayloadProto_idents[] = {
 404         { SCTP_PPID_IUA,    "ISDN Q.921" },
 405         { SCTP_PPID_M2UA,   "M2UA"   },
 406         { SCTP_PPID_M3UA,   "M3UA"   },
 407         { SCTP_PPID_SUA,    "SUA"    },
 408         { SCTP_PPID_M2PA,   "M2PA"   },
 409         { SCTP_PPID_V5UA,   "V5.2"   },
 410         { SCTP_PPID_H248,   "H.248"  },
 411         { SCTP_PPID_BICC,   "BICC"   },
 412         { SCTP_PPID_TALI,   "TALI"   },
 413         { SCTP_PPID_DUA,    "DUA"    },
 414         { SCTP_PPID_ASAP,   "ASAP"   },
 415         { SCTP_PPID_ENRP,   "ENRP"   },
 416         { SCTP_PPID_H323,   "H.323"  },
 417         { SCTP_PPID_QIPC,   "Q.IPC"  },
 418         { SCTP_PPID_SIMCO,  "SIMCO"  },
 419         { SCTP_PPID_DDPSC,  "DDPSC"  },
 420         { SCTP_PPID_DDPSSC, "DDPSSC" },
 421         { SCTP_PPID_S1AP,   "S1AP"   },
 422         { SCTP_PPID_RUA,    "RUA"    },
 423         { SCTP_PPID_HNBAP,  "HNBAP"  },
 424         { SCTP_PPID_FORCES_HP, "ForCES HP" },
 425         { SCTP_PPID_FORCES_MP, "ForCES MP" },
 426         { SCTP_PPID_FORCES_LP, "ForCES LP" },
 427         { SCTP_PPID_SBC_AP, "SBc-AP" },
 428         { SCTP_PPID_NBAP,   "NBAP"   },
 429         /* 26 */
 430         { SCTP_PPID_X2AP,   "X2AP"   },
 431         { 0, NULL }
 432 };
 433
 434
 435 static int
 436 isForCES_port(u_short Port)
 437 {
 438         if (Port == CHAN_HP)
 439                 return 1;
 440         if (Port == CHAN_MP)
 441                 return 1;
 442         if (Port == CHAN_LP)
 443                 return 1;
 444
 445         return 0;
 446 }
 447
 448 void
 449 sctp_print(netdissect_options *ndo,
 450            const u_char *bp,        /* beginning of sctp packet */
 451            const u_char *bp2,       /* beginning of enclosing */
 452            u_int sctpPacketLength)  /* ip packet */
 453 {
 454   u_int sctpPacketLengthRemaining;
 455   const struct sctpHeader *sctpPktHdr;
 456   const struct ip *ip;
 457   const struct ip6_hdr *ip6;
 458   uint8_t chunkID;
 459   u_short sourcePort, destPort;
 460   u_int chunkCount;
 461   const struct sctpChunkDesc *chunkDescPtr;
 462   const char *sep;
 463   int isforces = 0;
 464
 465   ndo->ndo_protocol = "sctp";
 466   if (sctpPacketLength < sizeof(struct sctpHeader))
 467     {
 468       ND_PRINT("truncated-sctp - %zu bytes missing!",
 469                sizeof(struct sctpHeader) - sctpPacketLength);
 470       return;
 471     }
 472   sctpPktHdr = (const struct sctpHeader*) bp;
 473   ND_TCHECK_SIZE(sctpPktHdr);
 474   sctpPacketLengthRemaining = sctpPacketLength;
 475
 476   sourcePort = GET_BE_U_2(sctpPktHdr->source);
 477   destPort = GET_BE_U_2(sctpPktHdr->destination);
 478
 479   ip = (const struct ip *)bp2;
 480   if (IP_V(ip) == 6)
 481     ip6 = (const struct ip6_hdr *)bp2;
 482   else
 483     ip6 = NULL;
 484
 485   if (ip6) {
 486     ND_PRINT("%s.%u > %s.%u: sctp",
 487       GET_IP6ADDR_STRING(ip6->ip6_src),
 488       sourcePort,
 489       GET_IP6ADDR_STRING(ip6->ip6_dst),
 490       destPort);
 491   } else {
 492     ND_PRINT("%s.%u > %s.%u: sctp",
 493       GET_IPADDR_STRING(ip->ip_src),
 494       sourcePort,
 495       GET_IPADDR_STRING(ip->ip_dst),
 496       destPort);
 497   }
 498
 499   if (isForCES_port(sourcePort)) {
 500          ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, sourcePort));
 501          isforces = 1;
 502   }
 503   if (isForCES_port(destPort)) {
 504          ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, destPort));
 505          isforces = 1;
 506   }
 507
 508   bp += sizeof(struct sctpHeader);
 509   sctpPacketLengthRemaining -= sizeof(struct sctpHeader);
 510
 511   if (ndo->ndo_vflag >= 2)
 512     sep = "\n\t";
 513   else
 514     sep = " (";
 515   /* cycle through all chunks, printing information on each one */
 516   for (chunkCount = 0, chunkDescPtr = (const struct sctpChunkDesc *)bp;
 517       sctpPacketLengthRemaining != 0;
 518       chunkCount++)
 519     {
 520       uint16_t chunkLength, chunkLengthRemaining;
 521       uint16_t align;
 522
 523       chunkDescPtr = (const struct sctpChunkDesc *)bp;
 524       if (sctpPacketLengthRemaining < sizeof(*chunkDescPtr)) {
 525         ND_PRINT("%s%u) [chunk descriptor cut off at end of packet]", sep, chunkCount+1);
 526         break;
 527       }
 528       ND_TCHECK_SIZE(chunkDescPtr);
 529       chunkLength = GET_BE_U_2(chunkDescPtr->chunkLength);
 530       if (chunkLength < sizeof(*chunkDescPtr)) {
 531         ND_PRINT("%s%u) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength);
 532         break;
 533       }
 534       chunkLengthRemaining = chunkLength;
 535
 536       align = chunkLength % 4;
 537       if (align != 0)
 538         align = 4 - align;
 539
 540       if (sctpPacketLengthRemaining < align) {
 541         ND_PRINT("%s%u) [Bad chunk length %u, > remaining data in packet]", sep, chunkCount+1, chunkLength);
 542         break;
 543       }
 544
 545       ND_TCHECK_LEN(bp, chunkLength);
 546
 547       bp += sizeof(*chunkDescPtr);
 548       sctpPacketLengthRemaining -= sizeof(*chunkDescPtr);
 549       chunkLengthRemaining -= sizeof(*chunkDescPtr);
 550
 551       ND_PRINT("%s%u) ", sep, chunkCount+1);
 552       chunkID = GET_U_1(chunkDescPtr->chunkID);
 553       ND_PRINT("[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
 554                chunkID));
 555       switch (chunkID) {
 556         case SCTP_DATA :
 557           {
 558             const struct sctpDataPart *dataHdrPtr;
 559             uint8_t chunkFlg;
 560             uint32_t ppid;
 561             uint16_t payload_size;
 562
 563             chunkFlg = GET_U_1(chunkDescPtr->chunkFlg);
 564             if ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)
 565               ND_PRINT("(U)");
 566
 567             if ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG)
 568               ND_PRINT("(B)");
 569
 570             if ((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG)
 571               ND_PRINT("(E)");
 572
 573             if( ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED) ||
 574                 ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) ||
 575                 ((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) )
 576               ND_PRINT(" ");
 577
 578             if (chunkLengthRemaining < sizeof(*dataHdrPtr)) {
 579                 ND_PRINT("bogus chunk length %u]", chunkLength);
 580                 return;
 581             }
 582             dataHdrPtr=(const struct sctpDataPart*)bp;
 583
 584             ppid = GET_BE_U_4(dataHdrPtr->payloadtype);
 585             ND_PRINT("[TSN: %u] ", GET_BE_U_4(dataHdrPtr->TSN));
 586             ND_PRINT("[SID: %u] ", GET_BE_U_2(dataHdrPtr->streamId));
 587             ND_PRINT("[SSEQ %u] ", GET_BE_U_2(dataHdrPtr->sequence));
 588             ND_PRINT("[PPID %s] ",
 589                     tok2str(PayloadProto_idents, "0x%x", ppid));
 590
 591             if (!isforces) {
 592                 isforces = (ppid == SCTP_PPID_FORCES_HP) ||
 593                     (ppid == SCTP_PPID_FORCES_MP) ||
 594                     (ppid == SCTP_PPID_FORCES_LP);
 595             }
 596
 597             bp += sizeof(*dataHdrPtr);
 598             sctpPacketLengthRemaining -= sizeof(*dataHdrPtr);
 599             chunkLengthRemaining -= sizeof(*dataHdrPtr);
 600             payload_size = chunkLengthRemaining;
 601             if (payload_size == 0) {
 602                 ND_PRINT("bogus chunk length %u]", chunkLength);
 603                 return;
 604             }
 605
 606             if (isforces) {
 607                 forces_print(ndo, bp, payload_size);
 608                 /* ndo_protocol reassignment after forces_print() call */
 609                 ndo->ndo_protocol = "sctp";
 610             } else if (ndo->ndo_vflag >= 2) {   /* if verbose output is specified */
 611                                         /* at the command line */
 612                 switch (ppid) {
 613                 case SCTP_PPID_M3UA :
 614                         m3ua_print(ndo, bp, payload_size);
 615                         /* ndo_protocol reassignment after m3ua_print() call */
 616                         ndo->ndo_protocol = "sctp";
 617                         break;
 618                 default:
 619                         ND_PRINT("[Payload");
 620                         if (!ndo->ndo_suppress_default_print) {
 621                                 ND_PRINT(":");
 622                                 ND_DEFAULTPRINT(bp, payload_size);
 623                         }
 624                         ND_PRINT("]");
 625                         break;
 626                 }
 627             }
 628             bp += payload_size;
 629             sctpPacketLengthRemaining -= payload_size;
 630             chunkLengthRemaining -= payload_size;
 631             break;
 632           }
 633         case SCTP_INITIATION :
 634           {
 635             const struct sctpInitiation *init;
 636
 637             if (chunkLengthRemaining < sizeof(*init)) {
 638                 ND_PRINT("bogus chunk length %u]", chunkLength);
 639                 return;
 640             }
 641             init=(const struct sctpInitiation*)bp;
 642             ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag));
 643             ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit));
 644             ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams));
 645             ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams));
 646             ND_PRINT("[init TSN: %u] ", GET_BE_U_4(init->initialTSN));
 647             bp += sizeof(*init);
 648             sctpPacketLengthRemaining -= sizeof(*init);
 649             chunkLengthRemaining -= sizeof(*init);
 650
 651 #if 0 /* ALC you can add code for optional params here */
 652             if( chunkLengthRemaining != 0 )
 653               ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
 654                      "Optional params present, but not printed.");
 655 #endif
 656             bp += chunkLengthRemaining;
 657             sctpPacketLengthRemaining -= chunkLengthRemaining;
 658             chunkLengthRemaining = 0;
 659             break;
 660           }
 661         case SCTP_INITIATION_ACK :
 662           {
 663             const struct sctpInitiation *init;
 664
 665             if (chunkLengthRemaining < sizeof(*init)) {
 666                 ND_PRINT("bogus chunk length %u]", chunkLength);
 667                 return;
 668             }
 669             init=(const struct sctpInitiation*)bp;
 670             ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag));
 671             ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit));
 672             ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams));
 673             ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams));
 674             ND_PRINT("[init TSN: %u] ", GET_BE_U_4(init->initialTSN));
 675             bp += sizeof(*init);
 676             sctpPacketLengthRemaining -= sizeof(*init);
 677             chunkLengthRemaining -= sizeof(*init);
 678
 679 #if 0 /* ALC you can add code for optional params here */
 680             if( chunkLengthRemaining != 0 )
 681               ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
 682                      "Optional params present, but not printed.");
 683 #endif
 684             bp += chunkLengthRemaining;
 685             sctpPacketLengthRemaining -= chunkLengthRemaining;
 686             chunkLengthRemaining = 0;
 687             break;
 688           }
 689         case SCTP_SELECTIVE_ACK:
 690           {
 691             const struct sctpSelectiveAck *sack;
 692             const struct sctpSelectiveFrag *frag;
 693             u_int fragNo, tsnNo;
 694             const u_char *dupTSN;
 695
 696             if (chunkLengthRemaining < sizeof(*sack)) {
 697               ND_PRINT("bogus chunk length %u]", chunkLength);
 698               return;
 699             }
 700             sack=(const struct sctpSelectiveAck*)bp;
 701             ND_PRINT("[cum ack %u] ", GET_BE_U_4(sack->highestConseqTSN));
 702             ND_PRINT("[a_rwnd %u] ", GET_BE_U_4(sack->updatedRwnd));
 703             ND_PRINT("[#gap acks %u] ", GET_BE_U_2(sack->numberOfdesc));
 704             ND_PRINT("[#dup tsns %u] ", GET_BE_U_2(sack->numDupTsns));
 705             bp += sizeof(*sack);
 706             sctpPacketLengthRemaining -= sizeof(*sack);
 707             chunkLengthRemaining -= sizeof(*sack);
 708
 709
 710             /* print gaps */
 711             for (fragNo=0;
 712                  chunkLengthRemaining != 0 && fragNo < GET_BE_U_2(sack->numberOfdesc);
 713                  bp += sizeof(*frag), sctpPacketLengthRemaining -= sizeof(*frag), chunkLengthRemaining -= sizeof(*frag), fragNo++) {
 714               if (chunkLengthRemaining < sizeof(*frag)) {
 715                 ND_PRINT("bogus chunk length %u]", chunkLength);
 716                 return;
 717               }
 718               frag = (const struct sctpSelectiveFrag *)bp;
 719               ND_PRINT("\n\t\t[gap ack block #%u: start = %u, end = %u] ",
 720                      fragNo+1,
 721                      GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentStart),
 722                      GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentEnd));
 723             }
 724
 725             /* print duplicate TSNs */
 726             for (tsnNo=0;
 727                  chunkLengthRemaining != 0 && tsnNo<GET_BE_U_2(sack->numDupTsns);
 728                  bp += 4, sctpPacketLengthRemaining -= 4, chunkLengthRemaining -= 4, tsnNo++) {
 729               if (chunkLengthRemaining < 4) {
 730                 ND_PRINT("bogus chunk length %u]", chunkLength);
 731                 return;
 732               }
 733               dupTSN = (const u_char *)bp;
 734               ND_PRINT("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 735                        GET_BE_U_4(dupTSN));
 736             }
 737             break;
 738           }
 739         default :
 740           {
 741             bp += chunkLengthRemaining;
 742             sctpPacketLengthRemaining -= chunkLengthRemaining;
 743             chunkLengthRemaining = 0;
 744             break;
 745           }
 746         }
 747
 748       /*
 749        * Any extra stuff at the end of the chunk?
 750        * XXX - report this?
 751        */
 752       bp += chunkLengthRemaining;
 753       sctpPacketLengthRemaining -= chunkLengthRemaining;
 754
 755       if (ndo->ndo_vflag < 2)
 756         sep = ", (";
 757
 758       if (align != 0) {
 759         /*
 760          * Fail if the alignment padding isn't in the captured data.
 761          * Otherwise, skip it.
 762          */
 763         ND_TCHECK_LEN(bp, align);
 764         bp += align;
 765         sctpPacketLengthRemaining -= align;
 766       }
 767     }
 768     return;
 769
 770 trunc:
 771     nd_print_trunc(ndo);
 772 }