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[] =
  38 "@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.12 2003-06-03 23:49:23 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
  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                         default_print(payloadPtr,
 202                               htons(chunkDescPtr->chunkLength)-1 -
 203                               sizeof(struct sctpDataPart)-sizeof(struct sctpChunkDesc));
 204                 } else
 205                         printf("]");
 206               }
 207             break;
 208           }
 209         case SCTP_INITIATION :
 210           {
 211             const struct sctpInitiation *init;
 212
 213             printf("[INIT] ");
 214             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 215             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 216             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 217             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 218             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 219             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 220
 221 #if(0) /* ALC you can add code for optional params here */
 222             if( (init+1) < chunkEnd )
 223               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 224                      "Optional params present, but not printed.");
 225 #endif
 226             break;
 227           }
 228         case SCTP_INITIATION_ACK :
 229           {
 230             const struct sctpInitiation *init;
 231
 232             printf("[INIT ACK] ");
 233             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 234             printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
 235             printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
 236             printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
 237             printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
 238             printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
 239
 240 #if(0) /* ALC you can add code for optional params here */
 241             if( (init+1) < chunkEnd )
 242               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 243                      "Optional params present, but not printed.");
 244 #endif
 245             break;
 246           }
 247         case SCTP_SELECTIVE_ACK:
 248           {
 249             const struct sctpSelectiveAck *sack;
 250             const struct sctpSelectiveFrag *frag;
 251             int fragNo, tsnNo;
 252             const u_long *dupTSN;
 253
 254             printf("[SACK] ");
 255             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 256             printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
 257             printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
 258             printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
 259             printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));
 260
 261
 262             /* print gaps */
 263             for (frag = ( (const struct sctpSelectiveFrag *)
 264                           ((const struct sctpSelectiveAck *) sack+1)),
 265                    fragNo=0;
 266                  (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
 267                  frag++, fragNo++)
 268               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 269                      fragNo+1,
 270                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
 271                      EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));
 272
 273
 274             /* print duplicate TSNs */
 275             for (dupTSN = (const u_long*)frag, tsnNo=0;
 276                  (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
 277                  dupTSN++, tsnNo++)
 278               printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 279                   EXTRACT_32BITS(dupTSN));
 280
 281             break;
 282           }
 283         case SCTP_HEARTBEAT_REQUEST :
 284           {
 285             const struct sctpHBsender *hb;
 286
 287             hb=(const struct sctpHBsender*)chunkDescPtr;
 288
 289             printf("[HB REQ] ");
 290
 291             break;
 292           }
 293         case SCTP_HEARTBEAT_ACK :
 294           printf("[HB ACK] ");
 295           break;
 296         case SCTP_ABORT_ASSOCIATION :
 297           printf("[ABORT] ");
 298           break;
 299         case SCTP_SHUTDOWN :
 300           printf("[SHUTDOWN] ");
 301           break;
 302         case SCTP_SHUTDOWN_ACK :
 303           printf("[SHUTDOWN ACK] ");
 304           break;
 305         case SCTP_OPERATION_ERR :
 306           printf("[OP ERR] ");
 307           break;
 308         case SCTP_COOKIE_ECHO :
 309           printf("[COOKIE ECHO] ");
 310           break;
 311         case SCTP_COOKIE_ACK :
 312           printf("[COOKIE ACK] ");
 313           break;
 314         case SCTP_ECN_ECHO :
 315           printf("[ECN ECHO] ");
 316           break;
 317         case SCTP_ECN_CWR :
 318           printf("[ECN CWR] ");
 319           break;
 320         case SCTP_SHUTDOWN_COMPLETE :
 321           printf("[SHUTDOWN COMPLETE] ");
 322           break;
 323         case SCTP_FORWARD_CUM_TSN :
 324           printf("[FOR CUM TSN] ");
 325           break;
 326         case SCTP_RELIABLE_CNTL :
 327           printf("[REL CTRL] ");
 328           break;
 329         case SCTP_RELIABLE_CNTL_ACK :
 330           printf("[REL CTRL ACK] ");
 331           break;
 332         default :
 333           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 334           return;
 335         }
 336     }
 337 }