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 1.2 2001-05-09 01:25:44 fenner 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 #if __STDC__
  55 struct mbuf;
  56 struct rtentry;
  57 #endif
  58 #include <net/if.h>
  59
  60 #include <netinet/in.h>
  61
  62 #include <stdio.h>
  63 #include <string.h>
  64
  65 #include "interface.h"
  66 #include "addrtoname.h"
  67 #include "extract.h"                    /* must come after interface.h */
  68 #include "ip.h"
  69 #ifdef INET6
  70 #include "ip6.h"
  71 #endif
  72
  73 void sctp_print(const u_char *bp,        /* beginning of sctp packet */
  74                 const u_char *bp2,       /* beginning of enclosing */
  75                 u_int sctpPacketLength)  /* ip packet */
  76 {
  77   const struct sctpHeader *sctpPktHdr;
  78   const struct ip *ip;
  79 #ifdef INET6
  80   const struct ip6_hdr *ip6;
  81 #endif
  82   const u_char *cp;
  83   void *endPacketPtr;
  84   u_short sourcePort, destPort;
  85   int chunkCount;
  86   struct sctpChunkDesc *chunkDescPtr;
  87   void *nextChunk;
  88
  89   sctpPktHdr = (struct sctpHeader*) bp;
  90   endPacketPtr = ((u_char*)((u_char*)sctpPktHdr+sctpPacketLength));
  91
  92   if( (u_long) endPacketPtr > (u_long) snapend)
  93     endPacketPtr = (void *) snapend;
  94   ip = (struct ip *)bp2;
  95 #ifdef INET6
  96   if (IP_V(ip) == 6)
  97     ip6 = (struct ip6_hdr *)bp2;
  98   else
  99     ip6 = NULL;
 100 #endif /*INET6*/
 101   cp = (u_char *)(sctpPktHdr + 1);
 102   if (cp > snapend)
 103     {
 104       printf("[|sctp]");
 105       return;
 106     }
 107
 108   if (sctpPacketLength < sizeof(struct sctpHeader))
 109     {
 110       (void)printf("truncated-sctp - %d bytes missing!",
 111                    sctpPacketLength-sizeof(struct sctpHeader));
 112       return;
 113     }
 114
 115   /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
 116   /*                          is now only as long as the payload  */
 117
 118   sourcePort = ntohs(sctpPktHdr->source);
 119   destPort = ntohs(sctpPktHdr->destination);
 120
 121 #ifdef INET6
 122   if (ip6) {
 123     if (ip6->ip6_nxt == IPPROTO_SCTP) {
 124       (void)printf("%s.%d > %s.%d: sctp",
 125         ip6addr_string(&ip6->ip6_src),
 126         sourcePort,
 127         ip6addr_string(&ip6->ip6_dst),
 128         destPort);
 129     } else {
 130       (void)printf("%d > %d: sctp",
 131         sourcePort, destPort);
 132     }
 133   } else
 134 #endif /*INET6*/
 135   {
 136     if (ip->ip_p == IPPROTO_SCTP) {
 137       (void)printf("%s.%d > %s.%d: sctp",
 138         ipaddr_string(&ip->ip_src),
 139         sourcePort,
 140         ipaddr_string(&ip->ip_dst),
 141         destPort);
 142     } else {
 143       (void)printf("%d > %d: sctp",
 144         sourcePort, destPort);
 145     }
 146   }
 147   fflush(stdout);
 148
 149   if (vflag < 2)
 150         return;
 151
 152   /* cycle through all chunks, printing information on each one */
 153   for (chunkCount = 0,
 154          chunkDescPtr = (struct sctpChunkDesc *) ( (u_char*) sctpPktHdr +
 155                                                    sizeof(struct sctpHeader));
 156        chunkDescPtr != NULL &&
 157          ( (void *)  ((u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
 158            <= endPacketPtr);
 159
 160        chunkDescPtr = (struct sctpChunkDesc *) nextChunk, chunkCount++)
 161     {
 162       u_short align;
 163       u_char *chunkEnd;
 164
 165       chunkEnd = ((u_char*)chunkDescPtr + ntohs(chunkDescPtr->chunkLength));
 166
 167       align=ntohs(chunkDescPtr->chunkLength) % 4;
 168       if (align != 0)
 169         align = 4 - align;
 170
 171       nextChunk = (void *) (chunkEnd + align);
 172
 173       printf("\n\t%d) ", chunkCount+1);
 174       switch (chunkDescPtr->chunkID)
 175         {
 176         case SCTP_DATA :
 177           {
 178             struct sctpDataPart *dataHdrPtr;
 179
 180             printf("[DATA] ");
 181
 182             if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 183                 == SCTP_DATA_UNORDERED)
 184               printf("(U)");
 185
 186             if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 187                 == SCTP_DATA_FIRST_FRAG)
 188               printf("(B)");
 189
 190             if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 191                 == SCTP_DATA_LAST_FRAG)
 192               printf("(E)");
 193
 194             if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
 195                  == SCTP_DATA_UNORDERED)
 196                 ||
 197                 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
 198                  == SCTP_DATA_FIRST_FRAG)
 199                 ||
 200                 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
 201                  == SCTP_DATA_LAST_FRAG) )
 202               printf(" ");
 203
 204             dataHdrPtr=(struct sctpDataPart*)(chunkDescPtr+1);
 205
 206             printf("[TSN: %lu] ", ntohl(dataHdrPtr->TSN));
 207             printf("[SID: %u] ", ntohs(dataHdrPtr->streamId));
 208             printf("[SSEQ %u] ", ntohs(dataHdrPtr->sequence));
 209             printf("[PPID 0x%x] ", (u_int32_t)ntohl(dataHdrPtr->payloadtype));
 210             fflush(stdout);
 211
 212             if (vflag)          /* if verbose output is specified */
 213               {                    /* at the command line */
 214                 char *payloadPtr;
 215
 216                 printf("[Payload: {");
 217                 fflush(stdout);
 218
 219                 payloadPtr = (char *) (++dataHdrPtr);
 220                 write(STDOUT_FILENO, payloadPtr,
 221                       htons(chunkDescPtr->chunkLength)-1 -
 222                       sizeof(struct sctpDataPart)-sizeof(struct sctpChunkDesc));
 223                 printf("}] ");
 224                 fflush(stdout);
 225               }
 226             break;
 227           }
 228         case SCTP_INITIATION :
 229           {
 230             struct sctpInitiation *init;
 231
 232             printf("[INIT] ");
 233             init=(struct sctpInitiation*)(chunkDescPtr+1);
 234             printf("[init tag: %lu] ", ntohl(init->initTag));
 235             printf("[rwnd: %lu] ", ntohl(init->rcvWindowCredit));
 236             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 237             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 238             printf("[init TSN: %lu] ", ntohl(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_INITIATION_ACK :
 248           {
 249             struct sctpInitiation *init;
 250
 251             printf("[INIT ACK] ");
 252             init=(struct sctpInitiation*)(chunkDescPtr+1);
 253             printf("[init tag: %lu] ", ntohl(init->initTag));
 254             printf("[rwnd: %lu] ", ntohl(init->rcvWindowCredit));
 255             printf("[OS: %u] ", ntohs(init->NumPreopenStreams));
 256             printf("[MIS: %u] ", ntohs(init->MaxInboundStreams));
 257             printf("[init TSN: %lu] ", ntohl(init->initialTSN));
 258
 259 #if(0) /* ALC you can add code for optional params here */
 260             if( (init+1) < chunkEnd )
 261               printf(" @@@@@ UNFINISHED @@@@@@%s\n",
 262                      "Optional params present, but not printed.");
 263 #endif
 264             break;
 265           }
 266         case SCTP_SELECTIVE_ACK:
 267           {
 268             struct sctpSelectiveAck *sack;
 269             struct sctpSelectiveFrag *frag;
 270             int fragNo, tsnNo;
 271             u_long *dupTSN;
 272
 273             printf("[SACK] ");
 274             sack=(struct sctpSelectiveAck*)(chunkDescPtr+1);
 275             printf("[cum ack %lu] ", ntohl(sack->highestConseqTSN));
 276             printf("[a_rwnd %lu] ", ntohl(sack->updatedRwnd));
 277             printf("[#gap acks %u] ", ntohs(sack->numberOfdesc));
 278             printf("[#dup tsns %u] ", ntohs(sack->numDupTsns));
 279
 280
 281             /* print gaps */
 282             for (frag = ( (struct sctpSelectiveFrag *)
 283                           ((struct sctpSelectiveAck *) sack+1)),
 284                    fragNo=0;
 285                  (void *)frag < nextChunk && fragNo < ntohs(sack->numberOfdesc);
 286                  frag++, fragNo++)
 287               printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
 288                      fragNo+1,
 289                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentStart)),
 290                      (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentEnd)));
 291
 292
 293             /* print duplicate TSNs */
 294             for (dupTSN = (u_long*)frag, tsnNo=0;
 295                  (void *) dupTSN < nextChunk && tsnNo<ntohs(sack->numDupTsns);
 296                  dupTSN++, tsnNo++)
 297               printf("\n\t\t[dup TSN #%u: %lu] ", tsnNo+1, ntohl(*dupTSN));
 298
 299             break;
 300           }
 301         case SCTP_HEARTBEAT_REQUEST :
 302           {
 303             struct sctpHBsender *hb;
 304
 305             hb=(struct sctpHBsender*)chunkDescPtr;
 306
 307             printf("[HB REQ] ");
 308
 309             break;
 310           }
 311         case SCTP_HEARTBEAT_ACK :
 312           printf("[HB ACK] ");
 313           break;
 314         case SCTP_ABORT_ASSOCIATION :
 315           printf("[ABORT] ");
 316           break;
 317         case SCTP_SHUTDOWN :
 318           printf("[SHUTDOWN] ");
 319           break;
 320         case SCTP_SHUTDOWN_ACK :
 321           printf("[SHUTDOWN ACK] ");
 322           break;
 323         case SCTP_OPERATION_ERR :
 324           printf("[OP ERR] ");
 325           break;
 326         case SCTP_COOKIE_ECHO :
 327           printf("[COOKIE ECHO] ");
 328           break;
 329         case SCTP_COOKIE_ACK :
 330           printf("[COOKIE ACK] ");
 331           break;
 332         case SCTP_ECN_ECHO :
 333           printf("[ECN ECHO] ");
 334           break;
 335         case SCTP_ECN_CWR :
 336           printf("[ECN CWR] ");
 337           break;
 338         case SCTP_SHUTDOWN_COMPLETE :
 339           printf("[SHUTDOWN COMPLETE] ");
 340           break;
 341         case SCTP_FORWARD_CUM_TSN :
 342           printf("[FOR CUM TSN] ");
 343           break;
 344         case SCTP_RELIABLE_CNTL :
 345           printf("[REL CTRL] ");
 346           break;
 347         case SCTP_RELIABLE_CNTL_ACK :
 348           printf("[REL CTRL ACK] ");
 349           break;
 350         default :
 351           printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
 352           return;
 353         }
 354     }
 355 }