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