예제 #1
0
void
_sctp_print(netdissect_options *ndo,
                const u_char *bp,        /* beginning of sctp packet */
                const u_char *bp2,       /* beginning of enclosing */
                u_int sctpPacketLength)  /* ip packet */
{
  const struct sctpHeader *sctpPktHdr;
  const struct ip *ip;
#ifdef INET6
  const struct ip6_hdr *ip6;
#endif
  const void *endPacketPtr;
  u_short sourcePort, destPort;
  int chunkCount;
  const struct sctpChunkDesc *chunkDescPtr;
  const void *nextChunk;
  const char *sep;
  int isforces = 0;


  sctpPktHdr = (const struct sctpHeader*) bp;
  endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;

  if( (u_long) endPacketPtr > (u_long) ndo->ndo_snapend)
    endPacketPtr = (const void *) ndo->ndo_snapend;
  ip = (struct ip *)bp2;
#ifdef INET6
  if (IP_V(ip) == 6)
    ip6 = (const struct ip6_hdr *)bp2;
  else
    ip6 = NULL;
#endif /*INET6*/
  ND_TCHECK(*sctpPktHdr);

  if (sctpPacketLength < sizeof(struct sctpHeader))
    {
      ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!",
		   (long)sctpPacketLength-sizeof(struct sctpHeader)));
      return;
    }

  /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
  /*  			      is now only as long as the payload  */

  sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
  destPort = EXTRACT_16BITS(&sctpPktHdr->destination);

#ifdef INET6
  if (ip6) {
    ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
      ip6addr_string(ndo, &ip6->ip6_src),
      sourcePort,
      ip6addr_string(ndo, &ip6->ip6_dst),
      destPort));
  } else
#endif /*INET6*/
  {
    ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
      ipaddr_string(ndo, &ip->ip_src),
      sourcePort,
      ipaddr_string(ndo, &ip->ip_dst),
      destPort));
  }

  if (isForCES_port(sourcePort)) {
         ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort)));
         isforces = 1;
  }
  if (isForCES_port(destPort)) {
         ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort)));
         isforces = 1;
  }

  if (ndo->ndo_vflag >= 2)
    sep = "\n\t";
  else
    sep = " (";
  /* cycle through all chunks, printing information on each one */
  for (chunkCount = 0,
	 chunkDescPtr = (const struct sctpChunkDesc *)
	    ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
       chunkDescPtr != NULL &&
	 ( (const void *)
	    ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
	   <= endPacketPtr);

       chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
    {
      uint16_t chunkLength;
      const u_char *chunkEnd;
      uint16_t align;

      ND_TCHECK(*chunkDescPtr);
      chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
      if (chunkLength < sizeof(*chunkDescPtr)) {
        ND_PRINT((ndo, "%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength));
        break;
      }

      ND_TCHECK2(*((uint8_t *)chunkDescPtr), chunkLength);
      chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);

      align=chunkLength % 4;
      if (align != 0)
	align = 4 - align;

      nextChunk = (const void *) (chunkEnd + align);

      ND_PRINT((ndo, "%s%d) ", sep, chunkCount+1));
      ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
                                      chunkDescPtr->chunkID)));
      switch (chunkDescPtr->chunkID)
	{
	case SCTP_DATA :
	  {
	    const struct sctpDataPart *dataHdrPtr;
	    uint32_t ppid;
	    const u_char *payloadPtr;
	    u_int payload_size;

	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
		== SCTP_DATA_UNORDERED)
	      ND_PRINT((ndo, "(U)"));

	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
		== SCTP_DATA_FIRST_FRAG)
	      ND_PRINT((ndo, "(B)"));

	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
		== SCTP_DATA_LAST_FRAG)
	      ND_PRINT((ndo, "(E)"));

	    if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
		 == SCTP_DATA_UNORDERED)
		||
		((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
		 == SCTP_DATA_FIRST_FRAG)
		||
		((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
		 == SCTP_DATA_LAST_FRAG) )
	      ND_PRINT((ndo, " "));

	    dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);

	    ppid = EXTRACT_32BITS(&dataHdrPtr->payloadtype);
	    ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN)));
	    ND_PRINT((ndo, "[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId)));
	    ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence)));
	    ND_PRINT((ndo, "[PPID %s] ",
		    tok2str(PayloadProto_idents, "0x%x", ppid)));

	    if (!isforces) {
		isforces = (ppid == SCTP_PPID_FORCES_HP) ||
		    (ppid == SCTP_PPID_FORCES_MP) ||
		    (ppid == SCTP_PPID_FORCES_LP);
	    }

	    payloadPtr = (const u_char *) (dataHdrPtr + 1);
	    if (EXTRACT_16BITS(&chunkDescPtr->chunkLength) <
		    sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc) + 1) {
		ND_PRINT((ndo, "bogus chunk length %u]", EXTRACT_16BITS(&chunkDescPtr->chunkLength)));
		return;
	    }

	    payload_size = EXTRACT_16BITS(&chunkDescPtr->chunkLength) -
		(sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc));

	    if (isforces) {
		forces_print(ndo, payloadPtr, payload_size);
	    } else if (ndo->ndo_vflag >= 2) {	/* if verbose output is specified */
					/* at the command line */
		switch (ppid) {
		case SCTP_PPID_M3UA :
			m3ua_print(ndo, payloadPtr, payload_size);
			break;
		default:
			ND_PRINT((ndo, "[Payload"));
			if (!ndo->ndo_suppress_default_print) {
				ND_PRINT((ndo, ":"));
				ND_DEFAULTPRINT(payloadPtr, payload_size);
			}
			ND_PRINT((ndo, "]"));
			break;
		}
	    }
	    break;
	  }
	case SCTP_INITIATION :
	  {
	    const struct sctpInitiation *init;

	    init=(const struct sctpInitiation*)(chunkDescPtr+1);
	    ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
	    ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
	    ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
	    ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
	    ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));

#if(0) /* ALC you can add code for optional params here */
	    if( (init+1) < chunkEnd )
	      ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
		     "Optional params present, but not printed."));
#endif
	    break;
	  }
	case SCTP_INITIATION_ACK :
	  {
	    const struct sctpInitiation *init;

	    init=(const struct sctpInitiation*)(chunkDescPtr+1);
	    ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
	    ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
	    ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
	    ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
	    ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));

#if(0) /* ALC you can add code for optional params here */
	    if( (init+1) < chunkEnd )
	      ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
		     "Optional params present, but not printed."));
#endif
	    break;
	  }
	case SCTP_SELECTIVE_ACK:
	  {
	    const struct sctpSelectiveAck *sack;
	    const struct sctpSelectiveFrag *frag;
	    int fragNo, tsnNo;
	    const u_char *dupTSN;

	    sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
	    ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN)));
	    ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd)));
	    ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc)));
	    ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns)));


	    /* print gaps */
	    for (frag = ( (const struct sctpSelectiveFrag *)
			  ((const struct sctpSelectiveAck *) sack+1)),
		   fragNo=0;
		 (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
		 frag++, fragNo++)
	      ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ",
		     fragNo+1,
		     EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
		     EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd)));


	    /* print duplicate TSNs */
	    for (dupTSN = (const u_char *)frag, tsnNo=0;
		 (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
		 dupTSN += 4, tsnNo++)
	      ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
	          EXTRACT_32BITS(dupTSN)));

	    break;
	  }
	}

	if (ndo->ndo_vflag < 2)
	  sep = ", (";
    }
    return;

trunc:
    ND_PRINT((ndo, "[|sctp]"));
}
예제 #2
0
파일: print-sctp.c 프로젝트: Wilm0r/tcpdump
void
sctp_print(netdissect_options *ndo,
           const u_char *bp,        /* beginning of sctp packet */
           const u_char *bp2,       /* beginning of enclosing */
           u_int sctpPacketLength)  /* ip packet */
{
  u_int sctpPacketLengthRemaining;
  const struct sctpHeader *sctpPktHdr;
  const struct ip *ip;
  const struct ip6_hdr *ip6;
  uint8_t chunkID;
  u_short sourcePort, destPort;
  u_int chunkCount;
  const struct sctpChunkDesc *chunkDescPtr;
  const char *sep;
  int isforces = 0;

  ndo->ndo_protocol = "sctp";
  if (sctpPacketLength < sizeof(struct sctpHeader))
    {
      ND_PRINT("truncated-sctp - %ld bytes missing!",
		   (long)(sizeof(struct sctpHeader) - sctpPacketLength));
      return;
    }
  sctpPktHdr = (const struct sctpHeader*) bp;
  ND_TCHECK_SIZE(sctpPktHdr);
  sctpPacketLengthRemaining = sctpPacketLength;

  sourcePort = EXTRACT_BE_U_2(sctpPktHdr->source);
  destPort = EXTRACT_BE_U_2(sctpPktHdr->destination);

  ip = (const struct ip *)bp2;
  if (IP_V(ip) == 6)
    ip6 = (const struct ip6_hdr *)bp2;
  else
    ip6 = NULL;

  if (ip6) {
    ND_PRINT("%s.%u > %s.%u: sctp",
      ip6addr_string(ndo, ip6->ip6_src),
      sourcePort,
      ip6addr_string(ndo, ip6->ip6_dst),
      destPort);
  } else
  {
    ND_PRINT("%s.%u > %s.%u: sctp",
      ipaddr_string(ndo, ip->ip_src),
      sourcePort,
      ipaddr_string(ndo, ip->ip_dst),
      destPort);
  }

  if (isForCES_port(sourcePort)) {
         ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, sourcePort));
         isforces = 1;
  }
  if (isForCES_port(destPort)) {
         ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, destPort));
         isforces = 1;
  }

  bp += sizeof(struct sctpHeader);
  sctpPacketLengthRemaining -= sizeof(struct sctpHeader);

  if (ndo->ndo_vflag >= 2)
    sep = "\n\t";
  else
    sep = " (";
  /* cycle through all chunks, printing information on each one */
  for (chunkCount = 0, chunkDescPtr = (const struct sctpChunkDesc *)bp;
      sctpPacketLengthRemaining != 0;
      chunkCount++)
    {
      uint16_t chunkLength, chunkLengthRemaining;
      uint16_t align;

      chunkDescPtr = (const struct sctpChunkDesc *)bp;
      if (sctpPacketLengthRemaining < sizeof(*chunkDescPtr)) {
        ND_PRINT("%s%u) [chunk descriptor cut off at end of packet]", sep, chunkCount+1);
        break;
      }
      ND_TCHECK_SIZE(chunkDescPtr);
      chunkLength = EXTRACT_BE_U_2(chunkDescPtr->chunkLength);
      if (chunkLength < sizeof(*chunkDescPtr)) {
        ND_PRINT("%s%u) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength);
        break;
      }
      chunkLengthRemaining = chunkLength;

      align = chunkLength % 4;
      if (align != 0)
	align = 4 - align;

      if (sctpPacketLengthRemaining < align) {
        ND_PRINT("%s%u) [Bad chunk length %u, > remaining data in packet]", sep, chunkCount+1, chunkLength);
        break;
      }

      ND_TCHECK_LEN(bp, chunkLength);

      bp += sizeof(*chunkDescPtr);
      sctpPacketLengthRemaining -= sizeof(*chunkDescPtr);
      chunkLengthRemaining -= sizeof(*chunkDescPtr);

      ND_PRINT("%s%u) ", sep, chunkCount+1);
      chunkID = EXTRACT_U_1(chunkDescPtr->chunkID);
      ND_PRINT("[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
                                      chunkID));
      switch (chunkID)
	{
	case SCTP_DATA :
	  {
	    const struct sctpDataPart *dataHdrPtr;
	    uint8_t chunkFlg;
	    uint32_t ppid;
	    u_int payload_size;

	    chunkFlg = EXTRACT_U_1(chunkDescPtr->chunkFlg);
	    if ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)
	      ND_PRINT("(U)");

	    if ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG)
	      ND_PRINT("(B)");

	    if ((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG)
	      ND_PRINT("(E)");

	    if( ((chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED) ||
	        ((chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) ||
		((chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) )
	      ND_PRINT(" ");

	    if (chunkLengthRemaining < sizeof(*dataHdrPtr)) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	    }
	    dataHdrPtr=(const struct sctpDataPart*)bp;

	    ppid = EXTRACT_BE_U_4(dataHdrPtr->payloadtype);
	    ND_PRINT("[TSN: %u] ", EXTRACT_BE_U_4(dataHdrPtr->TSN));
	    ND_PRINT("[SID: %u] ", EXTRACT_BE_U_2(dataHdrPtr->streamId));
	    ND_PRINT("[SSEQ %u] ", EXTRACT_BE_U_2(dataHdrPtr->sequence));
	    ND_PRINT("[PPID %s] ",
		    tok2str(PayloadProto_idents, "0x%x", ppid));

	    if (!isforces) {
		isforces = (ppid == SCTP_PPID_FORCES_HP) ||
		    (ppid == SCTP_PPID_FORCES_MP) ||
		    (ppid == SCTP_PPID_FORCES_LP);
	    }

	    bp += sizeof(*dataHdrPtr);
	    sctpPacketLengthRemaining -= sizeof(*dataHdrPtr);
	    chunkLengthRemaining -= sizeof(*dataHdrPtr);
	    payload_size = chunkLengthRemaining;
	    if (payload_size == 0) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	    }

	    if (isforces) {
		forces_print(ndo, bp, payload_size);
	    } else if (ndo->ndo_vflag >= 2) {	/* if verbose output is specified */
					/* at the command line */
		switch (ppid) {
		case SCTP_PPID_M3UA :
			m3ua_print(ndo, bp, payload_size);
			break;
		default:
			ND_PRINT("[Payload");
			if (!ndo->ndo_suppress_default_print) {
				ND_PRINT(":");
				ND_DEFAULTPRINT(bp, payload_size);
			}
			ND_PRINT("]");
			break;
		}
	    }
	    bp += payload_size;
	    sctpPacketLengthRemaining -= payload_size;
	    chunkLengthRemaining -= payload_size;
	    break;
	  }
	case SCTP_INITIATION :
	  {
	    const struct sctpInitiation *init;

	    if (chunkLengthRemaining < sizeof(*init)) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	    }
	    init=(const struct sctpInitiation*)bp;
	    ND_PRINT("[init tag: %u] ", EXTRACT_BE_U_4(init->initTag));
	    ND_PRINT("[rwnd: %u] ", EXTRACT_BE_U_4(init->rcvWindowCredit));
	    ND_PRINT("[OS: %u] ", EXTRACT_BE_U_2(init->NumPreopenStreams));
	    ND_PRINT("[MIS: %u] ", EXTRACT_BE_U_2(init->MaxInboundStreams));
	    ND_PRINT("[init TSN: %u] ", EXTRACT_BE_U_4(init->initialTSN));
	    bp += sizeof(*init);
 	    sctpPacketLengthRemaining -= sizeof(*init);
	    chunkLengthRemaining -= sizeof(*init);

#if 0 /* ALC you can add code for optional params here */
	    if( chunkLengthRemaining != 0 )
	      ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
		     "Optional params present, but not printed.");
#endif
            bp += chunkLengthRemaining;
	    sctpPacketLengthRemaining -= chunkLengthRemaining;
            chunkLengthRemaining = 0;
	    break;
	  }
	case SCTP_INITIATION_ACK :
	  {
	    const struct sctpInitiation *init;

	    if (chunkLengthRemaining < sizeof(*init)) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	    }
	    init=(const struct sctpInitiation*)bp;
	    ND_PRINT("[init tag: %u] ", EXTRACT_BE_U_4(init->initTag));
	    ND_PRINT("[rwnd: %u] ", EXTRACT_BE_U_4(init->rcvWindowCredit));
	    ND_PRINT("[OS: %u] ", EXTRACT_BE_U_2(init->NumPreopenStreams));
	    ND_PRINT("[MIS: %u] ", EXTRACT_BE_U_2(init->MaxInboundStreams));
	    ND_PRINT("[init TSN: %u] ", EXTRACT_BE_U_4(init->initialTSN));
            bp += sizeof(*init);
            sctpPacketLengthRemaining -= sizeof(*init);
            chunkLengthRemaining -= sizeof(*init);

#if 0 /* ALC you can add code for optional params here */
	    if( chunkLengthRemaining != 0 )
	      ND_PRINT(" @@@@@ UNFINISHED @@@@@@%s\n",
		     "Optional params present, but not printed.");
#endif
            bp += chunkLengthRemaining;
	    sctpPacketLengthRemaining -= chunkLengthRemaining;
            chunkLengthRemaining = 0;
	    break;
	  }
	case SCTP_SELECTIVE_ACK:
	  {
	    const struct sctpSelectiveAck *sack;
	    const struct sctpSelectiveFrag *frag;
	    u_int fragNo, tsnNo;
	    const u_char *dupTSN;

	    if (chunkLengthRemaining < sizeof(*sack)) {
	      ND_PRINT("bogus chunk length %u]", chunkLength);
	      return;
	    }
	    sack=(const struct sctpSelectiveAck*)bp;
	    ND_PRINT("[cum ack %u] ", EXTRACT_BE_U_4(sack->highestConseqTSN));
	    ND_PRINT("[a_rwnd %u] ", EXTRACT_BE_U_4(sack->updatedRwnd));
	    ND_PRINT("[#gap acks %u] ", EXTRACT_BE_U_2(sack->numberOfdesc));
	    ND_PRINT("[#dup tsns %u] ", EXTRACT_BE_U_2(sack->numDupTsns));
            bp += sizeof(*sack);
	    sctpPacketLengthRemaining -= sizeof(*sack);
            chunkLengthRemaining -= sizeof(*sack);


	    /* print gaps */
	    for (fragNo=0;
		 chunkLengthRemaining != 0 && fragNo < EXTRACT_BE_U_2(sack->numberOfdesc);
		 bp += sizeof(*frag), sctpPacketLengthRemaining -= sizeof(*frag), chunkLengthRemaining -= sizeof(*frag), fragNo++) {
	      if (chunkLengthRemaining < sizeof(*frag)) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	      }
	      frag = (const struct sctpSelectiveFrag *)bp;
	      ND_PRINT("\n\t\t[gap ack block #%u: start = %u, end = %u] ",
		     fragNo+1,
		     EXTRACT_BE_U_4(sack->highestConseqTSN) + EXTRACT_BE_U_2(frag->fragmentStart),
		     EXTRACT_BE_U_4(sack->highestConseqTSN) + EXTRACT_BE_U_2(frag->fragmentEnd));
	    }

	    /* print duplicate TSNs */
	    for (tsnNo=0;
		 chunkLengthRemaining != 0 && tsnNo<EXTRACT_BE_U_2(sack->numDupTsns);
		 bp += 4, sctpPacketLengthRemaining -= 4, chunkLengthRemaining -= 4, tsnNo++) {
	      if (chunkLengthRemaining < 4) {
		ND_PRINT("bogus chunk length %u]", chunkLength);
		return;
	      }
              dupTSN = (const u_char *)bp;
	      ND_PRINT("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
	        EXTRACT_BE_U_4(dupTSN));
	    }
	    break;
	  }
	default :
	  {
            bp += chunkLengthRemaining;
            sctpPacketLengthRemaining -= chunkLengthRemaining;
            chunkLengthRemaining = 0;
	    break;
	  }
	}

      /*
       * Any extra stuff at the end of the chunk?
       * XXX - report this?
       */
      bp += chunkLengthRemaining;
      sctpPacketLengthRemaining -= chunkLengthRemaining;

      if (ndo->ndo_vflag < 2)
        sep = ", (";

      if (align != 0) {
	/*
	 * Fail if the alignment padding isn't in the captured data.
	 * Otherwise, skip it.
	 */
	ND_TCHECK_LEN(bp, align);
	bp += align;
	sctpPacketLengthRemaining -= align;
      }
    }
    return;

trunc:
    ND_PRINT("[|sctp]");
}