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