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 1.8 2002-04-25 04:45:59 guy Exp $ (NETLAB/PEL)";
  39 #endif
  40
  41 #ifdef HAVE_CONFIG_H
  42 #include "config.h"
  43 #endif
  44
  45 #include <sys/param.h>
  46 #include <sys/time.h>
  47 #include <sys/socket.h>
  48
  49 #include <unistd.h>
  50 #include "sctpHeader.h"
  51 #include "sctpConstants.h"
  52 #include <assert.h>
  53
  54 #include <netinet/in.h>
  55
  56 #include <stdio.h>
  57 #include <string.h>
  58
  59 #include "interface.h"
  60 #include "addrtoname.h"
  61 #include "extract.h"                    /* must come after interface.h */
  62 #include "ip.h"
  63 #ifdef INET6
  64 #include "ip6.h"
  65 #endif
  66
  67 void sctp_print(const u_char *bp,        /* beginning of sctp packet */
  68                 const u_char *bp2,       /* beginning of enclosing */
  69                 u_int sctpPacketLength)  /* ip packet */
  70 {
  71   const struct sctpHeader *sctpPktHdr;
  72   const struct ip *ip;
  73 #ifdef INET6
  74   const struct ip6_hdr *ip6;
  75 #endif
  76   const u_char *cp;
  77   const void *endPacketPtr;
  78   u_short sourcePort, destPort;
  79   int chunkCount;
  80   const struct sctpChunkDesc *chunkDescPtr;
  81   const void *nextChunk;
  82
  83   sctpPktHdr = (const struct sctpHeader*) bp;
  84   endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
  85
  86   if( (u_long) endPacketPtr > (u_long) snapend)
  87     endPacketPtr = (const void *) snapend;
  88   ip = (struct ip *)bp2;
  89 #ifdef INET6
  90   if (IP_V(ip) == 6)
  91     ip6 = (const struct ip6_hdr *)bp2;
  92   else
  93     ip6 = NULL;
  94 #endif /*INET6*/
  95   cp = (const u_char *)(sctpPktHdr + 1);
  96   if (cp > snapend)
  97     {
  98       printf("[|sctp]");
  99       return;
 100     }
 101
 102   if (sctpPacketLength < sizeof(struct sctpHeader))
 103     {
 104       (void)printf("truncated-sctp - %ld bytes missing!",
 105                    (long)sctpPacketLength-sizeof(struct sctpHeader));
 106       return;
 107     }
 108
 109   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 110   /*                          is now only as long as the payload  */
 111
 112   sourcePort = ntohs(sctpPktHdr->source);
 113   destPort = ntohs(sctpPktHdr->destination);
 114
 115 #ifdef INET6
 116   if (ip6) {
 117     if (ip6->ip6_nxt == IPPROTO_SCTP) {
 118       (void)printf("%s.%d > %s.%d: sctp",
 119         ip6addr_string(&ip6->ip6_src),
 120         sourcePort,
 121         ip6addr_string(&ip6->ip6_dst),
 122         destPort);
 123     } else {
 124       (void)printf("%d > %d: sctp",
 125         sourcePort, destPort);
 126     }
 127   } else
 128 #endif /*INET6*/
 129   {
 130     if (ip->ip_p == IPPROTO_SCTP) {
 131       (void)printf("%s.%d > %s.%d: sctp",
 132         ipaddr_string(&ip->ip_src),
 133         sourcePort,
 134         ipaddr_string(&ip->ip_dst),
 135         destPort);
 136     } else {
 137       (void)printf("%d > %d: sctp",
 138         sourcePort, destPort);
 139     }
 140   }
 141   fflush(stdout);
 142
 143   if (vflag < 2)
 144         return;
 145
 146   /* cycle through all chunks, printing information on each one */
 147   for (chunkCount = 0,
 148          chunkDescPtr = (const struct sctpChunkDesc *)
 149             ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
 150        chunkDescPtr != NULL &&
 151          ( (const void *)
 152             ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 153            <= endPacketPtr);
 154
 155        chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
 156     {
 157       u_short align;
 158       const u_char *chunkEnd;
 159
 160       chunkEnd = ((const u_char*)chunkDescPtr + ntohs(chunkDescPtr->chunkLength));
 161
 162       align=ntohs(chunkDescPtr->chunkLength) % 4;
 163       if (align != 0)
 164         align = 4 - align;
 165
 166       nextChunk = (const void *) (chunkEnd + align);
 167
 168       printf("\n\t%d) ", chunkCount+1);
 169       switch (chunkDescPtr->chunkID)
 170         {
 171         case SCTP_DATA :
 172           {
 173             const struct sctpDataPart *dataHdrPtr;
 174
 175             printf("[DATA] ");
 176
 177             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 178                 == SCTP_DATA_UNORDERED)
 179               printf("(U)");
 180
 181             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 182                 == SCTP_DATA_FIRST_FRAG)
 183               printf("(B)");
 184
 185             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 186                 == SCTP_DATA_LAST_FRAG)
 187               printf("(E)");
 188
 189             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 190                  == SCTP_DATA_UNORDERED)
 191                 ||
 192                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 193                  == SCTP_DATA_FIRST_FRAG)
 194                 ||
 195                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 196                  == SCTP_DATA_LAST_FRAG) )
 197               printf(" ");
 198
 199             dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
 200
 201             printf("[TSN: %u] ", (u_int32_t)ntohl(dataHdrPtr->TSN));
 202             printf("[SID: %u] ", ntohs(dataHdrPtr->streamId));
 203             printf("[SSEQ %u] ", ntohs(dataHdrPtr->sequence));
 204             printf("[PPID 0x%x] ", (u_int32_t)ntohl(dataHdrPtr->payloadtype));
 205             fflush(stdout);
 206
 207             if (vflag)          /* if verbose output is specified */
 208               {                    /* at the command line */
 209                 const u_char *payloadPtr;
 210
 211                 printf("[Payload");
 212
 213                 if (!xflag && !qflag) {
 214                         payloadPtr = (const u_char *) (++dataHdrPtr);
 215                         printf(":");
 216                         default_print(payloadPtr,
 217                               htons(chunkDescPtr->chunkLength)-1 -
 218                               sizeof(struct sctpDataPart)-sizeof(struct sctpChunkDesc));
 219                 } else
 220                         printf("]");
 221               }
 222             break;
 223           }
 224         case SCTP_INITIATION :
 225           {
 226             const struct sctpInitiation *init;
 227
 228             printf("[INIT] ");
 229             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 230             printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag));
 231             printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit));
 232             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 233             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 234             printf("[init TSN: %u] ", (u_int32_t)ntohl(init->initialTSN));
 235
 236 #if(0) /* ALC you can add code for optional params here */
 237             if( (init+1) < chunkEnd )
 238               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 239                      "Optional params present, but not printed.");
 240 #endif
 241             break;
 242           }
 243         case SCTP_INITIATION_ACK :
 244           {
 245             const struct sctpInitiation *init;
 246
 247             printf("[INIT ACK] ");
 248             init=(const struct sctpInitiation*)(chunkDescPtr+1);
 249             printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag));
 250             printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit));
 251             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 252             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 253             printf("[init TSN: %u] ", (u_int32_t)ntohl(init->initialTSN));
 254
 255 #if(0) /* ALC you can add code for optional params here */
 256             if( (init+1) < chunkEnd )
 257               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 258                      "Optional params present, but not printed.");
 259 #endif
 260             break;
 261           }
 262         case SCTP_SELECTIVE_ACK:
 263           {
 264             const struct sctpSelectiveAck *sack;
 265             const struct sctpSelectiveFrag *frag;
 266             int fragNo, tsnNo;
 267             const u_long *dupTSN;
 268
 269             printf("[SACK] ");
 270             sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
 271             printf("[cum ack %u] ", (u_int32_t)ntohl(sack->highestConseqTSN));
 272             printf("[a_rwnd %u] ", (u_int32_t)ntohl(sack->updatedRwnd));
 273             printf("[#gap acks %u] ", ntohs(sack->numberOfdesc));
 274             printf("[#dup tsns %u] ", ntohs(sack->numDupTsns));
 275
 276
 277             /* print gaps */
 278             for (frag = ( (const struct sctpSelectiveFrag *)
 279                           ((const struct sctpSelectiveAck *) sack+1)),
 280                    fragNo=0;
 281                  (const void *)frag < nextChunk && fragNo < ntohs(sack->numberOfdesc);
 282                  frag++, fragNo++)
 283               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 284                      fragNo+1,
 285                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentStart)),
 286                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentEnd)));
 287
 288
 289             /* print duplicate TSNs */
 290             for (dupTSN = (const u_long*)frag, tsnNo=0;
 291                  (const void *) dupTSN < nextChunk && tsnNo<ntohs(sack->numDupTsns);
 292                  dupTSN++, tsnNo++)
 293               printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 294                   (u_int32_t)ntohl(*dupTSN));
 295
 296             break;
 297           }
 298         case SCTP_HEARTBEAT_REQUEST :
 299           {
 300             const struct sctpHBsender *hb;
 301
 302             hb=(const struct sctpHBsender*)chunkDescPtr;
 303
 304             printf("[HB REQ] ");
 305
 306             break;
 307           }
 308         case SCTP_HEARTBEAT_ACK :
 309           printf("[HB ACK] ");
 310           break;
 311         case SCTP_ABORT_ASSOCIATION :
 312           printf("[ABORT] ");
 313           break;
 314         case SCTP_SHUTDOWN :
 315           printf("[SHUTDOWN] ");
 316           break;
 317         case SCTP_SHUTDOWN_ACK :
 318           printf("[SHUTDOWN ACK] ");
 319           break;
 320         case SCTP_OPERATION_ERR :
 321           printf("[OP ERR] ");
 322           break;
 323         case SCTP_COOKIE_ECHO :
 324           printf("[COOKIE ECHO] ");
 325           break;
 326         case SCTP_COOKIE_ACK :
 327           printf("[COOKIE ACK] ");
 328           break;
 329         case SCTP_ECN_ECHO :
 330           printf("[ECN ECHO] ");
 331           break;
 332         case SCTP_ECN_CWR :
 333           printf("[ECN CWR] ");
 334           break;
 335         case SCTP_SHUTDOWN_COMPLETE :
 336           printf("[SHUTDOWN COMPLETE] ");
 337           break;
 338         case SCTP_FORWARD_CUM_TSN :
 339           printf("[FOR CUM TSN] ");
 340           break;
 341         case SCTP_RELIABLE_CNTL :
 342           printf("[REL CTRL] ");
 343           break;
 344         case SCTP_RELIABLE_CNTL_ACK :
 345           printf("[REL CTRL ACK] ");
 346           break;
 347         default :
 348           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 349           return;
 350         }
 351     }
 352 }