external/bsd/tcpdump/dist/print-sctp.c

   1 /*
   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 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __RCSID("$NetBSD: print-sctp.c,v 1.6 2014/11/20 03:05:03 christos Exp $");
  39 #endif
  40
  41 #define NETDISSECT_REWORKED
  42 #ifdef HAVE_CONFIG_H
  43 #include "config.h"
  44 #endif
  45
  46 #include <tcpdump-stdinc.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "extract.h"                    /* must come after interface.h */
  51 #include "ip.h"
  52 #ifdef INET6
  53 #include "ip6.h"
  54 #endif
  55
  56 /* Definitions from:
  57  *
  58  * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola
  59  *
  60  * Redistribution and use in source and binary forms, with or without
  61  * modification, are permitted provided that the following conditions
  62  * are met:
  63  *
  64  * 1. Redistributions of source code must retain the above copyright
  65  *    notice, this list of conditions and the following disclaimer.
  66  *
  67  * 2. Redistributions in binary form must reproduce the above copyright
  68  *    notice, this list of conditions and the following disclaimer in the
  69  *    documentation and/or other materials provided with the distribution.
  70  *
  71  * 3. Neither the name of Cisco nor of Motorola may be used
  72  *    to endorse or promote products derived from this software without
  73  *    specific prior written permission.
  74  *
  75  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  76  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  77  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  78  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  79  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  80  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  81  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  82  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  83  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  84  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  85  * SUCH DAMAGE.
  86  *
  87  * This file is part of the SCTP reference Implementation
  88  *
  89  *
  90  * Please send any bug reports or fixes you make to one of the following email
  91  * addresses:
  92  *
  93  * rstewar1@email.mot.com
  94  * kmorneau@cisco.com
  95  * qxie1@email.mot.com
  96  *
  97  * Any bugs reported given to us we will try to fix... any fixes shared will
  98  * be incorperated into the next SCTP release.
  99  */
 100
 101 /* The valid defines for all message
 102  * types know to SCTP. 0 is reserved
 103  */
 104 #define SCTP_DATA               0x00
 105 #define SCTP_INITIATION         0x01
 106 #define SCTP_INITIATION_ACK     0x02
 107 #define SCTP_SELECTIVE_ACK      0x03
 108 #define SCTP_HEARTBEAT_REQUEST  0x04
 109 #define SCTP_HEARTBEAT_ACK      0x05
 110 #define SCTP_ABORT_ASSOCIATION  0x06
 111 #define SCTP_SHUTDOWN           0x07
 112 #define SCTP_SHUTDOWN_ACK       0x08
 113 #define SCTP_OPERATION_ERR      0x09
 114 #define SCTP_COOKIE_ECHO        0x0a
 115 #define SCTP_COOKIE_ACK         0x0b
 116 #define SCTP_ECN_ECHO           0x0c
 117 #define SCTP_ECN_CWR            0x0d
 118 #define SCTP_SHUTDOWN_COMPLETE  0x0e
 119 #define SCTP_FORWARD_CUM_TSN    0xc0
 120 #define SCTP_RELIABLE_CNTL      0xc1
 121 #define SCTP_RELIABLE_CNTL_ACK  0xc2
 122
 123 static const struct tok sctp_chunkid_str[] = {
 124         { SCTP_DATA,              "DATA"              },
 125         { SCTP_INITIATION,        "INIT"              },
 126         { SCTP_INITIATION_ACK,    "INIT ACK"          },
 127         { SCTP_SELECTIVE_ACK,     "SACK"              },
 128         { SCTP_HEARTBEAT_REQUEST, "HB REQ"            },
 129         { SCTP_HEARTBEAT_ACK,     "HB ACK"            },
 130         { SCTP_ABORT_ASSOCIATION, "ABORT"             },
 131         { SCTP_SHUTDOWN,          "SHUTDOWN"          },
 132         { SCTP_SHUTDOWN_ACK,      "SHUTDOWN ACK"      },
 133         { SCTP_OPERATION_ERR,     "OP ERR"            },
 134         { SCTP_COOKIE_ECHO,       "COOKIE ECHO"       },
 135         { SCTP_COOKIE_ACK,        "COOKIE ACK"        },
 136         { SCTP_ECN_ECHO,          "ECN ECHO"          },
 137         { SCTP_ECN_CWR,           "ECN CWR"           },
 138         { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" },
 139         { SCTP_FORWARD_CUM_TSN,   "FOR CUM TSN"       },
 140         { SCTP_RELIABLE_CNTL,     "REL CTRL"          },
 141         { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK"      },
 142         { 0, NULL }
 143 };
 144
 145 /* Data Chuck Specific Flags */
 146 #define SCTP_DATA_FRAG_MASK     0x03
 147 #define SCTP_DATA_MIDDLE_FRAG   0x00
 148 #define SCTP_DATA_LAST_FRAG     0x01
 149 #define SCTP_DATA_FIRST_FRAG    0x02
 150 #define SCTP_DATA_NOT_FRAG      0x03
 151 #define SCTP_DATA_UNORDERED     0x04
 152
 153 #define SCTP_ADDRMAX 60
 154
 155 #define CHAN_HP 6704
 156 #define CHAN_MP 6705
 157 #define CHAN_LP 6706
 158
 159 /* the sctp common header */
 160
 161 struct sctpHeader{
 162   uint16_t source;
 163   uint16_t destination;
 164   uint32_t verificationTag;
 165   uint32_t adler32;
 166 };
 167
 168 /* various descriptor parsers */
 169
 170 struct sctpChunkDesc{
 171   uint8_t chunkID;
 172   uint8_t chunkFlg;
 173   uint16_t chunkLength;
 174 };
 175
 176 struct sctpParamDesc{
 177   uint16_t paramType;
 178   uint16_t paramLength;
 179 };
 180
 181
 182 struct sctpRelChunkDesc{
 183   struct sctpChunkDesc chk;
 184   uint32_t serialNumber;
 185 };
 186
 187 struct sctpVendorSpecificParam {
 188   struct sctpParamDesc p;  /* type must be 0xfffe */
 189   uint32_t vendorId;       /* vendor ID from RFC 1700 */
 190   uint16_t vendorSpecificType;
 191   uint16_t vendorSpecificLen;
 192 };
 193
 194
 195 /* Structures for the control parts */
 196
 197
 198
 199 /* Sctp association init request/ack */
 200
 201 /* this is used for init ack, too */
 202 struct sctpInitiation{
 203   uint32_t initTag;             /* tag of mine */
 204   uint32_t rcvWindowCredit;     /* rwnd */
 205   uint16_t NumPreopenStreams;   /* OS */
 206   uint16_t MaxInboundStreams;     /* MIS */
 207   uint32_t initialTSN;
 208   /* optional param's follow in sctpParamDesc form */
 209 };
 210
 211 struct sctpV4IpAddress{
 212   struct sctpParamDesc p;       /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */
 213   uint32_t  ipAddress;
 214 };
 215
 216
 217 struct sctpV6IpAddress{
 218   struct sctpParamDesc p;       /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
 219   uint8_t  ipAddress[16];
 220 };
 221
 222 struct sctpDNSName{
 223   struct sctpParamDesc param;
 224   uint8_t name[1];
 225 };
 226
 227
 228 struct sctpCookiePreserve{
 229   struct sctpParamDesc p;       /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
 230   uint32_t extraTime;
 231 };
 232
 233
 234 struct sctpTimeStamp{
 235   uint32_t ts_sec;
 236   uint32_t ts_usec;
 237 };
 238
 239 /* wire structure of my cookie */
 240 struct cookieMessage{
 241   uint32_t TieTag_curTag;               /* copied from assoc if present */
 242   uint32_t TieTag_hisTag;               /* copied from assoc if present */
 243   int32_t cookieLife;                   /* life I will award this cookie */
 244   struct sctpTimeStamp timeEnteringState; /* the time I built cookie */
 245   struct sctpInitiation initAckISent;   /* the INIT-ACK that I sent to my peer */
 246   uint32_t addressWhereISent[4];        /* I make this 4 ints so I get 128bits for future */
 247   int32_t addrtype;                     /* address type */
 248   uint16_t locScope;                    /* V6 local scope flag */
 249   uint16_t siteScope;                   /* V6 site scope flag */
 250   /* at the end is tacked on the INIT chunk sent in
 251    * its entirety and of course our
 252    * signature.
 253    */
 254 };
 255
 256
 257 /* this guy is for use when
 258  * I have a initiate message gloming the
 259  * things together.
 260
 261  */
 262 struct sctpUnifiedInit{
 263   struct sctpChunkDesc uh;
 264   struct sctpInitiation initm;
 265 };
 266
 267 struct sctpSendableInit{
 268   struct sctpHeader mh;
 269   struct sctpUnifiedInit msg;
 270 };
 271
 272
 273 /* Selective Acknowledgement
 274  * has the following structure with
 275  * a optional ammount of trailing int's
 276  * on the last part (based on the numberOfDesc
 277  * field).
 278  */
 279
 280 struct sctpSelectiveAck{
 281   uint32_t highestConseqTSN;
 282   uint32_t updatedRwnd;
 283   uint16_t numberOfdesc;
 284   uint16_t numDupTsns;
 285 };
 286
 287 struct sctpSelectiveFrag{
 288   uint16_t fragmentStart;
 289   uint16_t fragmentEnd;
 290 };
 291
 292
 293 struct sctpUnifiedSack{
 294   struct sctpChunkDesc uh;
 295   struct sctpSelectiveAck sack;
 296 };
 297
 298 /* for both RTT request/response the
 299  * following is sent
 300  */
 301
 302 struct sctpHBrequest {
 303   uint32_t time_value_1;
 304   uint32_t time_value_2;
 305 };
 306
 307 /* here is what I read and respond with to. */
 308 struct sctpHBunified{
 309   struct sctpChunkDesc hdr;
 310   struct sctpParamDesc hb;
 311 };
 312
 313
 314 /* here is what I send */
 315 struct sctpHBsender{
 316   struct sctpChunkDesc hdr;
 317   struct sctpParamDesc hb;
 318   struct sctpHBrequest rtt;
 319   int8_t addrFmt[SCTP_ADDRMAX];
 320   uint16_t userreq;
 321 };
 322
 323
 324
 325 /* for the abort and shutdown ACK
 326  * we must carry the init tag in the common header. Just the
 327  * common header is all that is needed with a chunk descriptor.
 328  */
 329 struct sctpUnifiedAbort{
 330   struct sctpChunkDesc uh;
 331 };
 332
 333 struct sctpUnifiedAbortLight{
 334   struct sctpHeader mh;
 335   struct sctpChunkDesc uh;
 336 };
 337
 338 struct sctpUnifiedAbortHeavy{
 339   struct sctpHeader mh;
 340   struct sctpChunkDesc uh;
 341   uint16_t causeCode;
 342   uint16_t causeLen;
 343 };
 344
 345 /* For the graceful shutdown we must carry
 346  * the tag (in common header)  and the highest consequitive acking value
 347  */
 348 struct sctpShutdown {
 349   uint32_t TSN_Seen;
 350 };
 351
 352 struct sctpUnifiedShutdown{
 353   struct sctpChunkDesc uh;
 354   struct sctpShutdown shut;
 355 };
 356
 357 /* in the unified message we add the trailing
 358  * stream id since it is the only message
 359  * that is defined as a operation error.
 360  */
 361 struct sctpOpErrorCause{
 362   uint16_t cause;
 363   uint16_t causeLen;
 364 };
 365
 366 struct sctpUnifiedOpError{
 367   struct sctpChunkDesc uh;
 368   struct sctpOpErrorCause c;
 369 };
 370
 371 struct sctpUnifiedStreamError{
 372   struct sctpHeader mh;
 373   struct sctpChunkDesc uh;
 374   struct sctpOpErrorCause c;
 375   uint16_t strmNum;
 376   uint16_t reserved;
 377 };
 378
 379 struct staleCookieMsg{
 380   struct sctpHeader mh;
 381   struct sctpChunkDesc uh;
 382   struct sctpOpErrorCause c;
 383   uint32_t moretime;
 384 };
 385
 386 /* the following is used in all sends
 387  * where nothing is needed except the
 388  * chunk/type i.e. shutdownAck Abort */
 389
 390 struct sctpUnifiedSingleMsg{
 391   struct sctpHeader mh;
 392   struct sctpChunkDesc uh;
 393 };
 394
 395 struct sctpDataPart{
 396   uint32_t TSN;
 397   uint16_t streamId;
 398   uint16_t sequence;
 399   uint32_t payloadtype;
 400 };
 401
 402 struct sctpUnifiedDatagram{
 403   struct sctpChunkDesc uh;
 404   struct sctpDataPart dp;
 405 };
 406
 407 struct sctpECN_echo{
 408   struct sctpChunkDesc uh;
 409   uint32_t Lowest_TSN;
 410 };
 411
 412
 413 struct sctpCWR{
 414   struct sctpChunkDesc uh;
 415   uint32_t TSN_reduced_at;
 416 };
 417
 418 static const struct tok ForCES_channels[] = {
 419         { CHAN_HP, "ForCES HP" },
 420         { CHAN_MP, "ForCES MP" },
 421         { CHAN_LP, "ForCES LP" },
 422         { 0, NULL }
 423 };
 424
 425 /* data chunk's payload protocol identifiers */
 426
 427 #define SCTP_PPID_IUA 1
 428 #define SCTP_PPID_M2UA 2
 429 #define SCTP_PPID_M3UA 3
 430 #define SCTP_PPID_SUA 4
 431 #define SCTP_PPID_M2PA 5
 432 #define SCTP_PPID_V5UA 6
 433 #define SCTP_PPID_H248 7
 434 #define SCTP_PPID_BICC 8
 435 #define SCTP_PPID_TALI 9
 436 #define SCTP_PPID_DUA 10
 437 #define SCTP_PPID_ASAP 11
 438 #define SCTP_PPID_ENRP 12
 439 #define SCTP_PPID_H323 13
 440 #define SCTP_PPID_QIPC 14
 441 #define SCTP_PPID_SIMCO 15
 442 #define SCTP_PPID_DDPSC 16
 443 #define SCTP_PPID_DDPSSC 17
 444 #define SCTP_PPID_S1AP 18
 445 #define SCTP_PPID_RUA 19
 446 #define SCTP_PPID_HNBAP 20
 447 #define SCTP_PPID_FORCES_HP 21
 448 #define SCTP_PPID_FORCES_MP 22
 449 #define SCTP_PPID_FORCES_LP 23
 450 #define SCTP_PPID_SBC_AP 24
 451 #define SCTP_PPID_NBAP 25
 452 /* 26 */
 453 #define SCTP_PPID_X2AP 27
 454
 455 static const struct tok PayloadProto_idents[] = {
 456         { SCTP_PPID_IUA,    "ISDN Q.921" },
 457         { SCTP_PPID_M2UA,   "M2UA"   },
 458         { SCTP_PPID_M3UA,   "M3UA"   },
 459         { SCTP_PPID_SUA,    "SUA"    },
 460         { SCTP_PPID_M2PA,   "M2PA"   },
 461         { SCTP_PPID_V5UA,   "V5.2"   },
 462         { SCTP_PPID_H248,   "H.248"  },
 463         { SCTP_PPID_BICC,   "BICC"   },
 464         { SCTP_PPID_TALI,   "TALI"   },
 465         { SCTP_PPID_DUA,    "DUA"    },
 466         { SCTP_PPID_ASAP,   "ASAP"   },
 467         { SCTP_PPID_ENRP,   "ENRP"   },
 468         { SCTP_PPID_H323,   "H.323"  },
 469         { SCTP_PPID_QIPC,   "Q.IPC"  },
 470         { SCTP_PPID_SIMCO,  "SIMCO"  },
 471         { SCTP_PPID_DDPSC,  "DDPSC"  },
 472         { SCTP_PPID_DDPSSC, "DDPSSC" },
 473         { SCTP_PPID_S1AP,   "S1AP"   },
 474         { SCTP_PPID_RUA,    "RUA"    },
 475         { SCTP_PPID_HNBAP,  "HNBAP"  },
 476         { SCTP_PPID_FORCES_HP, "ForCES HP" },
 477         { SCTP_PPID_FORCES_MP, "ForCES MP" },
 478         { SCTP_PPID_FORCES_LP, "ForCES LP" },
 479         { SCTP_PPID_SBC_AP, "SBc-AP" },
 480         { SCTP_PPID_NBAP,   "NBAP"   },
 481         /* 26 */
 482         { SCTP_PPID_X2AP,   "X2AP"   },
 483         { 0, NULL }
 484 };
 485
 486
 487 static inline int isForCES_port(u_short Port)
 488 {
 489         if (Port == CHAN_HP)
 490                 return 1;
 491         if (Port == CHAN_MP)
 492                 return 1;
 493         if (Port == CHAN_LP)
 494                 return 1;
 495
 496         return 0;
 497 }
 498
 499 void sctp_print(netdissect_options *ndo,
 500                 const u_char *bp,        /* beginning of sctp packet */
 501                 const u_char *bp2,       /* beginning of enclosing */
 502                 u_int sctpPacketLength)  /* ip packet */
 503 {
 504   const struct sctpHeader *sctpPktHdr;
 505   const struct ip *ip;
 506 #ifdef INET6
 507   const struct ip6_hdr *ip6;
 508 #endif
 509   const void *endPacketPtr;
 510   u_short sourcePort, destPort;
 511   int chunkCount;
 512   const struct sctpChunkDesc *chunkDescPtr;
 513   const void *nextChunk;
 514   const char *sep;
 515   int isforces = 0;
 516
 517
 518   sctpPktHdr = (const struct sctpHeader*) bp;
 519   endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
 520
 521   if( (u_long) endPacketPtr > (u_long) ndo->ndo_snapend)
 522     endPacketPtr = (const void *) ndo->ndo_snapend;
 523   ip = (struct ip *)bp2;
 524 #ifdef INET6
 525   if (IP_V(ip) == 6)
 526     ip6 = (const struct ip6_hdr *)bp2;
 527   else
 528     ip6 = NULL;
 529 #endif /*INET6*/
 530   ND_TCHECK(*sctpPktHdr);
 531
 532   if (sctpPacketLength < sizeof(struct sctpHeader))
 533     {
 534       ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!",
 535                    (long)sctpPacketLength-sizeof(struct sctpHeader)));
 536       return;
 537     }
 538
 539   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 540   /*                          is now only as long as the payload  */
 541
 542   sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
 543   destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
 544
 545 #ifdef INET6
 546   if (ip6) {
 547     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 548       ip6addr_string(ndo, &ip6->ip6_src),
 549       sourcePort,
 550       ip6addr_string(ndo, &ip6->ip6_dst),
 551       destPort));
 552   } else
 553 #endif /*INET6*/
 554   {
 555     ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
 556       ipaddr_string(ndo, &ip->ip_src),
 557       sourcePort,
 558       ipaddr_string(ndo, &ip->ip_dst),
 559       destPort));
 560   }
 561
 562   if (isForCES_port(sourcePort)) {
 563          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort)));
 564          isforces = 1;
 565   }
 566   if (isForCES_port(destPort)) {
 567          ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort)));
 568          isforces = 1;
 569   }
 570
 571   if (ndo->ndo_vflag >= 2)
 572     sep = "\n\t";
 573   else
 574     sep = " (";
 575   /* cycle through all chunks, printing information on each one */
 576   for (chunkCount = 0,
 577          chunkDescPtr = (const struct sctpChunkDesc *)
 578             ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
 579        chunkDescPtr != NULL &&
 580          ( (const void *)
 581             ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 582            <= endPacketPtr);
 583
 584        chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
 585     {
 586       uint16_t chunkLength;
 587       const u_char *chunkEnd;
 588       uint16_t align;
 589
 590       ND_TCHECK(*chunkDescPtr);
 591       chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
 592       if (chunkLength < sizeof(*chunkDescPtr)) {
 593         ND_PRINT((ndo, "%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength));
 594         break;
 595       }
 596
 597       ND_TCHECK2(*((uint8_t *)chunkDescPtr), chunkLength);
 598       chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
 599
 600       align=chunkLength % 4;
 601       if (align != 0)
 602         align = 4 - align;
 603
 604       nextChunk = (const void *) (chunkEnd + align);
 605
 606       ND_PRINT((ndo, "%s%d) ", sep, chunkCount+1));
 607       ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
 608                                       chunkDescPtr->chunkID)));
 609       switch (chunkDescPtr->chunkID)
 610         {
 611         case SCTP_DATA :
 612           {
 613             const struct sctpDataPart *dataHdrPtr;
 614             uint32_t ppid;
 615             const u_char *payloadPtr;
 616             u_int payload_size;
 617
 618             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 619                 == SCTP_DATA_UNORDERED)
 620               ND_PRINT((ndo, "(U)"));
 621
 622             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 623                 == SCTP_DATA_FIRST_FRAG)
 624               ND_PRINT((ndo, "(B)"));
 625
 626             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 627                 == SCTP_DATA_LAST_FRAG)
 628               ND_PRINT((ndo, "(E)"));
 629
 630             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 631                  == SCTP_DATA_UNORDERED)
 632                 ||
 633                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 634                  == SCTP_DATA_FIRST_FRAG)
 635                 ||
 636                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 637                  == SCTP_DATA_LAST_FRAG) )
 638               ND_PRINT((ndo, " "));
 639
 640             dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
 641
 642             ppid = EXTRACT_32BITS(&dataHdrPtr->payloadtype);
 643             ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN)));
 644             ND_PRINT((ndo, "[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId)));
 645             ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence)));
 646             ND_PRINT((ndo, "[PPID %s] ",
 647                     tok2str(PayloadProto_idents, "0x%x", ppid)));
 648
 649             if (!isforces) {
 650                 isforces = (ppid == SCTP_PPID_FORCES_HP) ||
 651                     (ppid == SCTP_PPID_FORCES_MP) ||
 652                     (ppid == SCTP_PPID_FORCES_LP);
 653             }
 654
 655             payloadPtr = (const u_char *) (dataHdrPtr + 1);
 656             if (EXTRACT_16BITS(&chunkDescPtr->chunkLength) <
 657                     sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc) + 1) {
 658                 ND_PRINT((ndo, "bogus chunk length %u]", EXTRACT_16BITS(&chunkDescPtr->chunkLength)));
 659                 return;
 660             }
 661
 662             payload_size = EXTRACT_16BITS(&chunkDescPtr->chunkLength) -
 663                 (sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc));
 664
 665             if (isforces) {
 666                 forces_print(ndo, payloadPtr, payload_size);
 667             } else if (ndo->ndo_vflag >= 2) {   /* if verbose output is specified */
 668                                         /* at the command line */
 669                 switch (ppid) {
 670                 case SCTP_PPID_M3UA :
 671                         m3ua_print(ndo, payloadPtr, payload_size);
 672                         break;
 673                 default:
 674                         ND_PRINT((ndo, "[Payload"));
 675                         if (!ndo->ndo_suppress_default_print) {
 676                                 ND_PRINT((ndo, ":"));
 677                                 ND_DEFAULTPRINT(payloadPtr, payload_size);
 678                         }
 679                         ND_PRINT((ndo, "]"));
 680                         break;
 681                 }
 682             }
 683             break;
 684           }
 685         case SCTP_INITIATION :
 686           {
 687             const struct sctpInitiation *init;
 688
 689             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 690             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 691             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 692             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 693             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 694             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 695
 696 #if(0) /* ALC you can add code for optional params here */
 697             if( (init+1) < chunkEnd )
 698               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 699                      "Optional params present, but not printed."));
 700 #endif
 701             break;
 702           }
 703         case SCTP_INITIATION_ACK :
 704           {
 705             const struct sctpInitiation *init;
 706
 707             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 708             ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
 709             ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
 710             ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
 711             ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
 712             ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
 713
 714 #if(0) /* ALC you can add code for optional params here */
 715             if( (init+1) < chunkEnd )
 716               ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
 717                      "Optional params present, but not printed."));
 718 #endif
 719             break;
 720           }
 721         case SCTP_SELECTIVE_ACK:
 722           {
 723             const struct sctpSelectiveAck *sack;
 724             const struct sctpSelectiveFrag *frag;
 725             int fragNo, tsnNo;
 726             const u_char *dupTSN;
 727
 728             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 729             ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN)));
 730             ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd)));
 731             ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc)));
 732             ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns)));
 733
 734
 735             /* print gaps */
 736             for (frag = ( (const struct sctpSelectiveFrag *)
 737                           ((const struct sctpSelectiveAck *) sack+1)),
 738                    fragNo=0;
 739                  (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 740                  frag++, fragNo++)
 741               ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 742                      fragNo+1,
 743                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 744                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd)));
 745
 746
 747             /* print duplicate TSNs */
 748             for (dupTSN = (const u_char *)frag, tsnNo=0;
 749                  (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 750                  dupTSN += 4, tsnNo++)
 751               ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 752                   EXTRACT_32BITS(dupTSN)));
 753
 754             break;
 755           }
 756         }
 757
 758         if (ndo->ndo_vflag < 2)
 759           sep = ", (";
 760     }
 761     return;
 762
 763 trunc:
 764     ND_PRINT((ndo, "[|sctp]"));
 765 }