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 1.13.2.2 2003-11-16 08:51:44 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
  78   sctpPktHdr = (const struct sctpHeader*) bp;
  79   endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
  80
  81   if( (u_long) endPacketPtr > (u_long) snapend)
  82     endPacketPtr = (const void *) snapend;
  83   ip = (struct ip *)bp2;
  84 #ifdef INET6
  85   if (IP_V(ip) == 6)
  86     ip6 = (const struct ip6_hdr *)bp2;
  87   else
  88     ip6 = NULL;
  89 #endif /*INET6*/
  90   cp = (const u_char *)(sctpPktHdr + 1);
  91   if (cp > snapend)
  92     {
  93       printf("[|sctp]");
  94       return;
  95     }
  96
  97   if (sctpPacketLength < sizeof(struct sctpHeader))
  98     {
  99       (void)printf("truncated-sctp - %ld bytes missing!",
 100                    (long)sctpPacketLength-sizeof(struct sctpHeader));
 101       return;
 102     }
 103
 104   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 105   /*                          is now only as long as the payload  */
 106
 107   sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
 108   destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
 109
 110 #ifdef INET6
 111   if (ip6) {
 112     (void)printf("%s.%d > %s.%d: sctp",
 113       ip6addr_string(&ip6->ip6_src),
 114       sourcePort,
 115       ip6addr_string(&ip6->ip6_dst),
 116       destPort);
 117   } else
 118 #endif /*INET6*/
 119   {
 120     (void)printf("%s.%d > %s.%d: sctp",
 121       ipaddr_string(&ip->ip_src),
 122       sourcePort,
 123       ipaddr_string(&ip->ip_dst),
 124       destPort);
 125   }
 126   fflush(stdout);
 127
 128   if (vflag < 2)
 129         return;
 130
 131   /* cycle through all chunks, printing information on each one */
 132   for (chunkCount = 0,
 133          chunkDescPtr = (const struct sctpChunkDesc *)
 134             ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
 135        chunkDescPtr != NULL &&
 136          ( (const void *)
 137             ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 138            <= endPacketPtr);
 139
 140        chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
 141     {
 142       u_short align;
 143       const u_char *chunkEnd;
 144
 145       chunkEnd = ((const u_char*)chunkDescPtr + EXTRACT_16BITS(&chunkDescPtr->chunkLength));
 146
 147       align=EXTRACT_16BITS(&chunkDescPtr->chunkLength) % 4;
 148       if (align != 0)
 149         align = 4 - align;
 150
 151       nextChunk = (const void *) (chunkEnd + align);
 152
 153       printf("\n\t%d) ", chunkCount+1);
 154       switch (chunkDescPtr->chunkID)
 155         {
 156         case SCTP_DATA :
 157           {
 158             const struct sctpDataPart *dataHdrPtr;
 159
 160             printf("[DATA] ");
 161
 162             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 163                 == SCTP_DATA_UNORDERED)
 164               printf("(U)");
 165
 166             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 167                 == SCTP_DATA_FIRST_FRAG)
 168               printf("(B)");
 169
 170             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 171                 == SCTP_DATA_LAST_FRAG)
 172               printf("(E)");
 173
 174             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 175                  == SCTP_DATA_UNORDERED)
 176                 ||
 177                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 178                  == SCTP_DATA_FIRST_FRAG)
 179                 ||
 180                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 181                  == SCTP_DATA_LAST_FRAG) )
 182               printf(" ");
 183
 184             dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
 185
 186             printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
 187             printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
 188             printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
 189             printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
 190             fflush(stdout);
 191
 192             if (vflag)          /* if verbose output is specified */
 193               {                    /* at the command line */
 194                 const u_char *payloadPtr;
 195
 196                 printf("[Payload");
 197
 198                 if (!xflag && !qflag) {
 199                         payloadPtr = (const u_char *) (++dataHdrPtr);
 200                         printf(":");
 201                         if (htons(chunkDescPtr->chunkLength) <
 202                             sizeof(struct sctpDataPart)+
 203                             sizeof(struct sctpChunkDesc)+1) {
 204                                 printf("bogus chunk length %u]",
 205                                     htons(chunkDescPtr->chunkLength));
 206                                 return;
 207                         }
 208                         default_print(payloadPtr,
 209                               htons(chunkDescPtr->chunkLength) -
 210                               (sizeof(struct sctpDataPart)+
 211                               sizeof(struct sctpChunkDesc)+1));
 212                 } else
 213                         printf("]");
 214               }
 215             break;
 216           }
 217         case SCTP_INITIATION :
 218           {
 219             const struct sctpInitiation *init;
 220
 221             printf("[INIT] ");
 222             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 223             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 224             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 225             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 226             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 227             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 228
 229 #if(0) /* ALC you can add code for optional params here */
 230             if( (init+1) < chunkEnd )
 231               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 232                      "Optional params present, but not printed.");
 233 #endif
 234             break;
 235           }
 236         case SCTP_INITIATION_ACK :
 237           {
 238             const struct sctpInitiation *init;
 239
 240             printf("[INIT ACK] ");
 241             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 242             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 243             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 244             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 245             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 246             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 247
 248 #if(0) /* ALC you can add code for optional params here */
 249             if( (init+1) < chunkEnd )
 250               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 251                      "Optional params present, but not printed.");
 252 #endif
 253             break;
 254           }
 255         case SCTP_SELECTIVE_ACK:
 256           {
 257             const struct sctpSelectiveAck *sack;
 258             const struct sctpSelectiveFrag *frag;
 259             int fragNo, tsnNo;
 260             const u_long *dupTSN;
 261
 262             printf("[SACK] ");
 263             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 264             printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
 265             printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
 266             printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
 267             printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));
 268
 269
 270             /* print gaps */
 271             for (frag = ( (const struct sctpSelectiveFrag *)
 272                           ((const struct sctpSelectiveAck *) sack+1)),
 273                    fragNo=0;
 274                  (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 275                  frag++, fragNo++)
 276               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 277                      fragNo+1,
 278                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 279                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));
 280
 281
 282             /* print duplicate TSNs */
 283             for (dupTSN = (const u_long*)frag, tsnNo=0;
 284                  (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 285                  dupTSN++, tsnNo++)
 286               printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 287                   EXTRACT_32BITS(dupTSN));
 288
 289             break;
 290           }
 291         case SCTP_HEARTBEAT_REQUEST :
 292           {
 293             const struct sctpHBsender *hb;
 294
 295             hb=(const struct sctpHBsender*)chunkDescPtr;
 296
 297             printf("[HB REQ] ");
 298
 299             break;
 300           }
 301         case SCTP_HEARTBEAT_ACK :
 302           printf("[HB ACK] ");
 303           break;
 304         case SCTP_ABORT_ASSOCIATION :
 305           printf("[ABORT] ");
 306           break;
 307         case SCTP_SHUTDOWN :
 308           printf("[SHUTDOWN] ");
 309           break;
 310         case SCTP_SHUTDOWN_ACK :
 311           printf("[SHUTDOWN ACK] ");
 312           break;
 313         case SCTP_OPERATION_ERR :
 314           printf("[OP ERR] ");
 315           break;
 316         case SCTP_COOKIE_ECHO :
 317           printf("[COOKIE ECHO] ");
 318           break;
 319         case SCTP_COOKIE_ACK :
 320           printf("[COOKIE ACK] ");
 321           break;
 322         case SCTP_ECN_ECHO :
 323           printf("[ECN ECHO] ");
 324           break;
 325         case SCTP_ECN_CWR :
 326           printf("[ECN CWR] ");
 327           break;
 328         case SCTP_SHUTDOWN_COMPLETE :
 329           printf("[SHUTDOWN COMPLETE] ");
 330           break;
 331         case SCTP_FORWARD_CUM_TSN :
 332           printf("[FOR CUM TSN] ");
 333           break;
 334         case SCTP_RELIABLE_CNTL :
 335           printf("[REL CTRL] ");
 336           break;
 337         case SCTP_RELIABLE_CNTL_ACK :
 338           printf("[REL CTRL ACK] ");
 339           break;
 340         default :
 341           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 342           return;
 343         }
 344     }
 345 }