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 1.5 2001-08-01 03:31:55 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   void *endPacketPtr;
  78   u_short sourcePort, destPort;
  79   int chunkCount;
  80   struct sctpChunkDesc *chunkDescPtr;
  81   void *nextChunk;
  82
  83   sctpPktHdr = (struct sctpHeader*) bp;
  84   endPacketPtr = ((u_char*)((u_char*)sctpPktHdr+sctpPacketLength));
  85
  86   if( (u_long) endPacketPtr > (u_long) snapend)
  87     endPacketPtr = (void *) snapend;
  88   ip = (struct ip *)bp2;
  89 #ifdef INET6
  90   if (IP_V(ip) == 6)
  91     ip6 = (struct ip6_hdr *)bp2;
  92   else
  93     ip6 = NULL;
  94 #endif /*INET6*/
  95   cp = (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 = (struct sctpChunkDesc *) ( (u_char*) sctpPktHdr +
 149                                                    sizeof(struct sctpHeader));
 150        chunkDescPtr != NULL &&
 151          ( (void *)  ((u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 152            <= endPacketPtr);
 153
 154        chunkDescPtr = (struct sctpChunkDesc *) nextChunk, chunkCount++)
 155     {
 156       u_short align;
 157       u_char *chunkEnd;
 158
 159       chunkEnd = ((u_char*)chunkDescPtr + ntohs(chunkDescPtr->chunkLength));
 160
 161       align=ntohs(chunkDescPtr->chunkLength) % 4;
 162       if (align != 0)
 163         align = 4 - align;
 164
 165       nextChunk = (void *) (chunkEnd + align);
 166
 167       printf("\n\t%d) ", chunkCount+1);
 168       switch (chunkDescPtr->chunkID)
 169         {
 170         case SCTP_DATA :
 171           {
 172             struct sctpDataPart *dataHdrPtr;
 173
 174             printf("[DATA] ");
 175
 176             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 177                 == SCTP_DATA_UNORDERED)
 178               printf("(U)");
 179
 180             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 181                 == SCTP_DATA_FIRST_FRAG)
 182               printf("(B)");
 183
 184             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 185                 == SCTP_DATA_LAST_FRAG)
 186               printf("(E)");
 187
 188             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 189                  == SCTP_DATA_UNORDERED)
 190                 ||
 191                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 192                  == SCTP_DATA_FIRST_FRAG)
 193                 ||
 194                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 195                  == SCTP_DATA_LAST_FRAG) )
 196               printf(" ");
 197
 198             dataHdrPtr=(struct sctpDataPart*)(chunkDescPtr+1);
 199
 200             printf("[TSN: %u] ", (u_int32_t)ntohl(dataHdrPtr->TSN));
 201             printf("[SID: %u] ", ntohs(dataHdrPtr->streamId));
 202             printf("[SSEQ %u] ", ntohs(dataHdrPtr->sequence));
 203             printf("[PPID 0x%x] ", (u_int32_t)ntohl(dataHdrPtr->payloadtype));
 204             fflush(stdout);
 205
 206             if (vflag)          /* if verbose output is specified */
 207               {                    /* at the command line */
 208                 char *payloadPtr;
 209
 210                 printf("[Payload: {");
 211                 fflush(stdout);
 212
 213                 payloadPtr = (char *) (++dataHdrPtr);
 214                 write(STDOUT_FILENO, payloadPtr,
 215                       htons(chunkDescPtr->chunkLength)-1 -
 216                       sizeof(struct sctpDataPart)-sizeof(struct sctpChunkDesc));
 217                 printf("}] ");
 218                 fflush(stdout);
 219               }
 220             break;
 221           }
 222         case SCTP_INITIATION :
 223           {
 224             struct sctpInitiation *init;
 225
 226             printf("[INIT] ");
 227             init=(struct sctpInitiation*)(chunkDescPtr+1);
 228             printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag));
 229             printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit));
 230             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 231             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 232             printf("[init TSN: %u] ", (u_int32_t)ntohl(init->initialTSN));
 233
 234 #if(0) /* ALC you can add code for optional params here */
 235             if( (init+1) < chunkEnd )
 236               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 237                      "Optional params present, but not printed.");
 238 #endif
 239             break;
 240           }
 241         case SCTP_INITIATION_ACK :
 242           {
 243             struct sctpInitiation *init;
 244
 245             printf("[INIT ACK] ");
 246             init=(struct sctpInitiation*)(chunkDescPtr+1);
 247             printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag));
 248             printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit));
 249             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 250             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 251             printf("[init TSN: %u] ", (u_int32_t)ntohl(init->initialTSN));
 252
 253 #if(0) /* ALC you can add code for optional params here */
 254             if( (init+1) < chunkEnd )
 255               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 256                      "Optional params present, but not printed.");
 257 #endif
 258             break;
 259           }
 260         case SCTP_SELECTIVE_ACK:
 261           {
 262             struct sctpSelectiveAck *sack;
 263             struct sctpSelectiveFrag *frag;
 264             int fragNo, tsnNo;
 265             u_long *dupTSN;
 266
 267             printf("[SACK] ");
 268             sack=(struct sctpSelectiveAck*)(chunkDescPtr+1);
 269             printf("[cum ack %u] ", (u_int32_t)ntohl(sack->highestConseqTSN));
 270             printf("[a_rwnd %u] ", (u_int32_t)ntohl(sack->updatedRwnd));
 271             printf("[#gap acks %u] ", ntohs(sack->numberOfdesc));
 272             printf("[#dup tsns %u] ", ntohs(sack->numDupTsns));
 273
 274
 275             /* print gaps */
 276             for (frag = ( (struct sctpSelectiveFrag *)
 277                           ((struct sctpSelectiveAck *) sack+1)),
 278                    fragNo=0;
 279                  (void *)frag < nextChunk && fragNo < ntohs(sack->numberOfdesc);
 280                  frag++, fragNo++)
 281               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 282                      fragNo+1,
 283                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentStart)),
 284                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentEnd)));
 285
 286
 287             /* print duplicate TSNs */
 288             for (dupTSN = (u_long*)frag, tsnNo=0;
 289                  (void *) dupTSN < nextChunk && tsnNo<ntohs(sack->numDupTsns);
 290                  dupTSN++, tsnNo++)
 291               printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
 292                   (u_int32_t)ntohl(*dupTSN));
 293
 294             break;
 295           }
 296         case SCTP_HEARTBEAT_REQUEST :
 297           {
 298             struct sctpHBsender *hb;
 299
 300             hb=(struct sctpHBsender*)chunkDescPtr;
 301
 302             printf("[HB REQ] ");
 303
 304             break;
 305           }
 306         case SCTP_HEARTBEAT_ACK :
 307           printf("[HB ACK] ");
 308           break;
 309         case SCTP_ABORT_ASSOCIATION :
 310           printf("[ABORT] ");
 311           break;
 312         case SCTP_SHUTDOWN :
 313           printf("[SHUTDOWN] ");
 314           break;
 315         case SCTP_SHUTDOWN_ACK :
 316           printf("[SHUTDOWN ACK] ");
 317           break;
 318         case SCTP_OPERATION_ERR :
 319           printf("[OP ERR] ");
 320           break;
 321         case SCTP_COOKIE_ECHO :
 322           printf("[COOKIE ECHO] ");
 323           break;
 324         case SCTP_COOKIE_ACK :
 325           printf("[COOKIE ACK] ");
 326           break;
 327         case SCTP_ECN_ECHO :
 328           printf("[ECN ECHO] ");
 329           break;
 330         case SCTP_ECN_CWR :
 331           printf("[ECN CWR] ");
 332           break;
 333         case SCTP_SHUTDOWN_COMPLETE :
 334           printf("[SHUTDOWN COMPLETE] ");
 335           break;
 336         case SCTP_FORWARD_CUM_TSN :
 337           printf("[FOR CUM TSN] ");
 338           break;
 339         case SCTP_RELIABLE_CNTL :
 340           printf("[REL CTRL] ");
 341           break;
 342         case SCTP_RELIABLE_CNTL_ACK :
 343           printf("[REL CTRL ACK] ");
 344           break;
 345         default :
 346           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 347           return;
 348         }
 349     }
 350 }