360 lines
10 KiB
C
360 lines
10 KiB
C
/* Copyright (c) 2001 NETLAB, Temple University
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* Copyright (c) 2001 Protocol Engineering Lab, University of Delaware
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*
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* Jerry Heinz <gheinz@astro.temple.edu>
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* John Fiore <jfiore@joda.cis.temple.edu>
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* Armando L. Caro Jr. <acaro@cis.udel.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.21 2007-09-13 18:03:49 guy Exp $ (NETLAB/PEL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "sctpHeader.h"
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#include "sctpConstants.h"
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#ifdef INET6
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#include "ip6.h"
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#endif
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void sctp_print(const u_char *bp, /* beginning of sctp packet */
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const u_char *bp2, /* beginning of enclosing */
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u_int sctpPacketLength) /* ip packet */
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{
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const struct sctpHeader *sctpPktHdr;
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const struct ip *ip;
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#ifdef INET6
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const struct ip6_hdr *ip6;
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#endif
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const void *endPacketPtr;
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u_short sourcePort, destPort;
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int chunkCount;
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const struct sctpChunkDesc *chunkDescPtr;
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const void *nextChunk;
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const char *sep;
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sctpPktHdr = (const struct sctpHeader*) bp;
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endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
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if( (u_long) endPacketPtr > (u_long) snapend)
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endPacketPtr = (const void *) snapend;
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ip = (struct ip *)bp2;
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#ifdef INET6
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if (IP_V(ip) == 6)
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ip6 = (const struct ip6_hdr *)bp2;
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else
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ip6 = NULL;
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#endif /*INET6*/
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TCHECK(*sctpPktHdr);
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if (sctpPacketLength < sizeof(struct sctpHeader))
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{
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(void)printf("truncated-sctp - %ld bytes missing!",
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(long)sctpPacketLength-sizeof(struct sctpHeader));
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return;
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}
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/* sctpPacketLength -= sizeof(struct sctpHeader); packet length */
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/* is now only as long as the payload */
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sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
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destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
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#ifdef INET6
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if (ip6) {
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(void)printf("%s.%d > %s.%d: sctp",
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ip6addr_string(&ip6->ip6_src),
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sourcePort,
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ip6addr_string(&ip6->ip6_dst),
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destPort);
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} else
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#endif /*INET6*/
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{
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(void)printf("%s.%d > %s.%d: sctp",
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ipaddr_string(&ip->ip_src),
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sourcePort,
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ipaddr_string(&ip->ip_dst),
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destPort);
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}
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fflush(stdout);
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if (vflag >= 2)
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sep = "\n\t";
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else
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sep = " (";
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/* cycle through all chunks, printing information on each one */
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for (chunkCount = 0,
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chunkDescPtr = (const struct sctpChunkDesc *)
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((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
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chunkDescPtr != NULL &&
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( (const void *)
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((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
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<= endPacketPtr);
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chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
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{
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u_int16_t chunkLength;
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const u_char *chunkEnd;
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u_int16_t align;
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TCHECK(*chunkDescPtr);
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chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
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if (chunkLength < sizeof(*chunkDescPtr)) {
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printf("%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength);
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break;
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}
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TCHECK2(*((u_int8_t *)chunkDescPtr), chunkLength);
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chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
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align=chunkLength % 4;
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if (align != 0)
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align = 4 - align;
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nextChunk = (const void *) (chunkEnd + align);
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printf("%s%d) ", sep, chunkCount+1);
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switch (chunkDescPtr->chunkID)
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{
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case SCTP_DATA :
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{
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const struct sctpDataPart *dataHdrPtr;
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printf("[DATA] ");
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if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
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== SCTP_DATA_UNORDERED)
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printf("(U)");
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if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
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== SCTP_DATA_FIRST_FRAG)
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printf("(B)");
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if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
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== SCTP_DATA_LAST_FRAG)
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printf("(E)");
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if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
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== SCTP_DATA_UNORDERED)
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||
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((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
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== SCTP_DATA_FIRST_FRAG)
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||
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((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
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== SCTP_DATA_LAST_FRAG) )
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printf(" ");
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dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
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printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
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printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
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printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
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printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
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fflush(stdout);
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if (vflag >= 2) /* if verbose output is specified */
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{ /* at the command line */
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const u_char *payloadPtr;
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printf("[Payload");
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if (!suppress_default_print) {
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payloadPtr = (const u_char *) (++dataHdrPtr);
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printf(":");
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if (htons(chunkDescPtr->chunkLength) <
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sizeof(struct sctpDataPart)+
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sizeof(struct sctpChunkDesc)+1) {
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/* Less than 1 byte of chunk payload */
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printf("bogus chunk length %u]",
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htons(chunkDescPtr->chunkLength));
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return;
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}
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default_print(payloadPtr,
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htons(chunkDescPtr->chunkLength) -
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(sizeof(struct sctpDataPart)+
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sizeof(struct sctpChunkDesc)));
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} else
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printf("]");
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}
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break;
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}
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case SCTP_INITIATION :
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{
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const struct sctpInitiation *init;
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printf("[INIT] ");
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init=(const struct sctpInitiation*)(chunkDescPtr+1);
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printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
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printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
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printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
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printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
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printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
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#if(0) /* ALC you can add code for optional params here */
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if( (init+1) < chunkEnd )
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printf(" @@@@@ UNFINISHED @@@@@@%s\n",
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"Optional params present, but not printed.");
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#endif
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break;
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}
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case SCTP_INITIATION_ACK :
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{
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const struct sctpInitiation *init;
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printf("[INIT ACK] ");
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init=(const struct sctpInitiation*)(chunkDescPtr+1);
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printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
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printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
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printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
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printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
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printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
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#if(0) /* ALC you can add code for optional params here */
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if( (init+1) < chunkEnd )
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printf(" @@@@@ UNFINISHED @@@@@@%s\n",
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"Optional params present, but not printed.");
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#endif
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break;
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}
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case SCTP_SELECTIVE_ACK:
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{
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const struct sctpSelectiveAck *sack;
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const struct sctpSelectiveFrag *frag;
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int fragNo, tsnNo;
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const u_char *dupTSN;
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printf("[SACK] ");
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sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
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printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
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printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
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printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
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printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));
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/* print gaps */
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for (frag = ( (const struct sctpSelectiveFrag *)
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((const struct sctpSelectiveAck *) sack+1)),
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fragNo=0;
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(const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
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frag++, fragNo++)
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printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
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fragNo+1,
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EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
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EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));
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/* print duplicate TSNs */
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for (dupTSN = (const u_char *)frag, tsnNo=0;
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(const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
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dupTSN += 4, tsnNo++)
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printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
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EXTRACT_32BITS(dupTSN));
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break;
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}
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case SCTP_HEARTBEAT_REQUEST :
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{
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const struct sctpHBsender *hb;
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hb=(const struct sctpHBsender*)chunkDescPtr;
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printf("[HB REQ] ");
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break;
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}
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case SCTP_HEARTBEAT_ACK :
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printf("[HB ACK] ");
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break;
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case SCTP_ABORT_ASSOCIATION :
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printf("[ABORT] ");
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break;
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case SCTP_SHUTDOWN :
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printf("[SHUTDOWN] ");
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break;
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case SCTP_SHUTDOWN_ACK :
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printf("[SHUTDOWN ACK] ");
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break;
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case SCTP_OPERATION_ERR :
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printf("[OP ERR] ");
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break;
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case SCTP_COOKIE_ECHO :
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printf("[COOKIE ECHO] ");
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break;
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case SCTP_COOKIE_ACK :
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printf("[COOKIE ACK] ");
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break;
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case SCTP_ECN_ECHO :
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printf("[ECN ECHO] ");
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break;
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case SCTP_ECN_CWR :
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printf("[ECN CWR] ");
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break;
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case SCTP_SHUTDOWN_COMPLETE :
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printf("[SHUTDOWN COMPLETE] ");
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break;
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case SCTP_FORWARD_CUM_TSN :
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printf("[FOR CUM TSN] ");
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break;
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case SCTP_RELIABLE_CNTL :
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printf("[REL CTRL] ");
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break;
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case SCTP_RELIABLE_CNTL_ACK :
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printf("[REL CTRL ACK] ");
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break;
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default :
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printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
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return;
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}
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if (vflag < 2)
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sep = ", (";
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}
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return;
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trunc:
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printf("[|sctp]");
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return;
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}
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