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 #ifndef lint
  37 static const char rcsid[] _U_ =
  38 "@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.16 2004-12-15 08:43:23 guy Exp $ (NETLAB/PEL)";
  39 #endif
  40
  41 #ifdef HAVE_CONFIG_H
  42 #include "config.h"
  43 #endif
  44
  45 #include <tcpdump-stdinc.h>
  46
  47 #include "sctpHeader.h"
  48 #include "sctpConstants.h"
  49 #include <assert.h>
  50
  51 #include <stdio.h>
  52 #include <string.h>
  53
  54 #include "interface.h"
  55 #include "addrtoname.h"
  56 #include "extract.h"                    /* must come after interface.h */
  57 #include "ip.h"
  58 #ifdef INET6
  59 #include "ip6.h"
  60 #endif
  61
  62 void sctp_print(const u_char *bp,        /* beginning of sctp packet */
  63                 const u_char *bp2,       /* beginning of enclosing */
  64                 u_int sctpPacketLength)  /* ip packet */
  65 {
  66   const struct sctpHeader *sctpPktHdr;
  67   const struct ip *ip;
  68 #ifdef INET6
  69   const struct ip6_hdr *ip6;
  70 #endif
  71   const u_char *cp;
  72   const void *endPacketPtr;
  73   u_short sourcePort, destPort;
  74   int chunkCount;
  75   const struct sctpChunkDesc *chunkDescPtr;
  76   const void *nextChunk;
  77   const char *sep;
  78
  79   sctpPktHdr = (const struct sctpHeader*) bp;
  80   endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
  81
  82   if( (u_long) endPacketPtr > (u_long) snapend)
  83     endPacketPtr = (const void *) snapend;
  84   ip = (struct ip *)bp2;
  85 #ifdef INET6
  86   if (IP_V(ip) == 6)
  87     ip6 = (const struct ip6_hdr *)bp2;
  88   else
  89     ip6 = NULL;
  90 #endif /*INET6*/
  91   cp = (const u_char *)(sctpPktHdr + 1);
  92   if (cp > snapend)
  93     {
  94       printf("[|sctp]");
  95       return;
  96     }
  97
  98   if (sctpPacketLength < sizeof(struct sctpHeader))
  99     {
 100       (void)printf("truncated-sctp - %ld bytes missing!",
 101                    (long)sctpPacketLength-sizeof(struct sctpHeader));
 102       return;
 103     }
 104
 105   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 106   /*                          is now only as long as the payload  */
 107
 108   sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
 109   destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
 110
 111 #ifdef INET6
 112   if (ip6) {
 113     (void)printf("%s.%d > %s.%d: sctp",
 114       ip6addr_string(&ip6->ip6_src),
 115       sourcePort,
 116       ip6addr_string(&ip6->ip6_dst),
 117       destPort);
 118   } else
 119 #endif /*INET6*/
 120   {
 121     (void)printf("%s.%d > %s.%d: sctp",
 122       ipaddr_string(&ip->ip_src),
 123       sourcePort,
 124       ipaddr_string(&ip->ip_dst),
 125       destPort);
 126   }
 127   fflush(stdout);
 128
 129   if (vflag >= 2)
 130     sep = "\n\t";
 131   else
 132     sep = " (";
 133   /* cycle through all chunks, printing information on each one */
 134   for (chunkCount = 0,
 135          chunkDescPtr = (const struct sctpChunkDesc *)
 136             ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
 137        chunkDescPtr != NULL &&
 138          ( (const void *)
 139             ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 140            <= endPacketPtr);
 141
 142        chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
 143     {
 144       u_short align;
 145       const u_char *chunkEnd;
 146
 147       chunkEnd = ((const u_char*)chunkDescPtr + EXTRACT_16BITS(&chunkDescPtr->chunkLength));
 148
 149       align=EXTRACT_16BITS(&chunkDescPtr->chunkLength) % 4;
 150       if (align != 0)
 151         align = 4 - align;
 152
 153       nextChunk = (const void *) (chunkEnd + align);
 154
 155       printf("%s%d) ", sep, chunkCount+1);
 156       switch (chunkDescPtr->chunkID)
 157         {
 158         case SCTP_DATA :
 159           {
 160             const struct sctpDataPart *dataHdrPtr;
 161
 162             printf("[DATA] ");
 163
 164             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 165                 == SCTP_DATA_UNORDERED)
 166               printf("(U)");
 167
 168             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 169                 == SCTP_DATA_FIRST_FRAG)
 170               printf("(B)");
 171
 172             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 173                 == SCTP_DATA_LAST_FRAG)
 174               printf("(E)");
 175
 176             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 177                  == SCTP_DATA_UNORDERED)
 178                 ||
 179                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 180                  == SCTP_DATA_FIRST_FRAG)
 181                 ||
 182                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 183                  == SCTP_DATA_LAST_FRAG) )
 184               printf(" ");
 185
 186             dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
 187
 188             printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
 189             printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
 190             printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
 191             printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
 192             fflush(stdout);
 193
 194             if (vflag >= 2)        /* if verbose output is specified */
 195               {                    /* at the command line */
 196                 const u_char *payloadPtr;
 197
 198                 printf("[Payload");
 199
 200                 if (!xflag && !qflag) {
 201                         payloadPtr = (const u_char *) (++dataHdrPtr);
 202                         printf(":");
 203                         if (htons(chunkDescPtr->chunkLength) <
 204                             sizeof(struct sctpDataPart)+
 205                             sizeof(struct sctpChunkDesc)+1) {
 206                                 printf("bogus chunk length %u]",
 207                                     htons(chunkDescPtr->chunkLength));
 208                                 return;
 209                         }
 210                         default_print(payloadPtr,
 211                               htons(chunkDescPtr->chunkLength) -
 212                               (sizeof(struct sctpDataPart)+
 213                               sizeof(struct sctpChunkDesc)+1));
 214                 } else
 215                         printf("]");
 216               }
 217             break;
 218           }
 219         case SCTP_INITIATION :
 220           {
 221             const struct sctpInitiation *init;
 222
 223             printf("[INIT] ");
 224             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 225             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 226             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 227             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 228             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 229             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 230
 231 #if(0) /* ALC you can add code for optional params here */
 232             if( (init+1) < chunkEnd )
 233               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 234                      "Optional params present, but not printed.");
 235 #endif
 236             break;
 237           }
 238         case SCTP_INITIATION_ACK :
 239           {
 240             const struct sctpInitiation *init;
 241
 242             printf("[INIT ACK] ");
 243             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 244             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 245             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 246             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 247             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 248             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 249
 250 #if(0) /* ALC you can add code for optional params here */
 251             if( (init+1) < chunkEnd )
 252               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 253                      "Optional params present, but not printed.");
 254 #endif
 255             break;
 256           }
 257         case SCTP_SELECTIVE_ACK:
 258           {
 259             const struct sctpSelectiveAck *sack;
 260             const struct sctpSelectiveFrag *frag;
 261             int fragNo, tsnNo;
 262             const u_long *dupTSN;
 263
 264             printf("[SACK] ");
 265             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 266             printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
 267             printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
 268             printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
 269             printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));
 270
 271
 272             /* print gaps */
 273             for (frag = ( (const struct sctpSelectiveFrag *)
 274                           ((const struct sctpSelectiveAck *) sack+1)),
 275                    fragNo=0;
 276                  (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 277                  frag++, fragNo++)
 278               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 279                      fragNo+1,
 280                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 281                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));
 282
 283
 284             /* print duplicate TSNs */
 285             for (dupTSN = (const u_long*)frag, tsnNo=0;
 286                  (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 287                  dupTSN++, tsnNo++)
 288               printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 289                   EXTRACT_32BITS(dupTSN));
 290
 291             break;
 292           }
 293         case SCTP_HEARTBEAT_REQUEST :
 294           {
 295             const struct sctpHBsender *hb;
 296
 297             hb=(const struct sctpHBsender*)chunkDescPtr;
 298
 299             printf("[HB REQ] ");
 300
 301             break;
 302           }
 303         case SCTP_HEARTBEAT_ACK :
 304           printf("[HB ACK] ");
 305           break;
 306         case SCTP_ABORT_ASSOCIATION :
 307           printf("[ABORT] ");
 308           break;
 309         case SCTP_SHUTDOWN :
 310           printf("[SHUTDOWN] ");
 311           break;
 312         case SCTP_SHUTDOWN_ACK :
 313           printf("[SHUTDOWN ACK] ");
 314           break;
 315         case SCTP_OPERATION_ERR :
 316           printf("[OP ERR] ");
 317           break;
 318         case SCTP_COOKIE_ECHO :
 319           printf("[COOKIE ECHO] ");
 320           break;
 321         case SCTP_COOKIE_ACK :
 322           printf("[COOKIE ACK] ");
 323           break;
 324         case SCTP_ECN_ECHO :
 325           printf("[ECN ECHO] ");
 326           break;
 327         case SCTP_ECN_CWR :
 328           printf("[ECN CWR] ");
 329           break;
 330         case SCTP_SHUTDOWN_COMPLETE :
 331           printf("[SHUTDOWN COMPLETE] ");
 332           break;
 333         case SCTP_FORWARD_CUM_TSN :
 334           printf("[FOR CUM TSN] ");
 335           break;
 336         case SCTP_RELIABLE_CNTL :
 337           printf("[REL CTRL] ");
 338           break;
 339         case SCTP_RELIABLE_CNTL_ACK :
 340           printf("[REL CTRL ACK] ");
 341           break;
 342         default :
 343           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 344           return;
 345         }
 346
 347         if (vflag < 2)
 348           sep = ", (";
 349     }
 350 }