/* Copyright (c) 2001 NETLAB, Temple University
* Copyright (c) 2001 Protocol Engineering Lab, University of Delaware
*
* Jerry Heinz <gheinz@astro.temple.edu>
* John Fiore <jfiore@joda.cis.temple.edu>
* Armando L. Caro Jr. <acaro@cis.udel.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.16.2.5 2007/09/13 18:04:58 guy Exp $ (NETLAB/PEL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "sctpHeader.h"
#include "sctpConstants.h"
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
#include "ip.h"
#ifdef INET6
#include "ip6.h"
#endif
void sctp_print(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;
sctpPktHdr = (const struct sctpHeader*) bp;
endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
if( (u_long) endPacketPtr > (u_long) snapend)
endPacketPtr = (const void *) snapend;
ip = (struct ip *)bp2;
#ifdef INET6
if (IP_V(ip) == 6)
ip6 = (const struct ip6_hdr *)bp2;
else
ip6 = NULL;
#endif /*INET6*/
TCHECK(*sctpPktHdr);
if (sctpPacketLength < sizeof(struct sctpHeader))
{
(void)printf("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) {
(void)printf("%s.%d > %s.%d: sctp",
ip6addr_string(&ip6->ip6_src),
sourcePort,
ip6addr_string(&ip6->ip6_dst),
destPort);
} else
#endif /*INET6*/
{
(void)printf("%s.%d > %s.%d: sctp",
ipaddr_string(&ip->ip_src),
sourcePort,
ipaddr_string(&ip->ip_dst),
destPort);
}
fflush(stdout);
if (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++)
{
u_int16_t chunkLength;
const u_char *chunkEnd;
u_int16_t align;
TCHECK(*chunkDescPtr);
chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
if (chunkLength < sizeof(*chunkDescPtr)) {
printf("%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength);
break;
}
TCHECK2(*((u_int8_t *)chunkDescPtr), chunkLength);
chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
align=chunkLength % 4;
if (align != 0)
align = 4 - align;
nextChunk = (const void *) (chunkEnd + align);
printf("%s%d) ", sep, chunkCount+1);
switch (chunkDescPtr->chunkID)
{
case SCTP_DATA :
{
const struct sctpDataPart *dataHdrPtr;
printf("[DATA] ");
if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
== SCTP_DATA_UNORDERED)
printf("(U)");
if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
== SCTP_DATA_FIRST_FRAG)
printf("(B)");
if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
== SCTP_DATA_LAST_FRAG)
printf("(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) )
printf(" ");
dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
fflush(stdout);
if (vflag >= 2) /* if verbose output is specified */
{ /* at the command line */
const u_char *payloadPtr;
printf("[Payload");
if (!suppress_default_print) {
payloadPtr = (const u_char *) (++dataHdrPtr);
printf(":");
if (htons(chunkDescPtr->chunkLength) <
sizeof(struct sctpDataPart)+
sizeof(struct sctpChunkDesc)+1) {
/* Less than 1 byte of chunk payload */
printf("bogus chunk length %u]",
htons(chunkDescPtr->chunkLength));
return;
}
default_print(payloadPtr,
htons(chunkDescPtr->chunkLength) -
(sizeof(struct sctpDataPart)+
sizeof(struct sctpChunkDesc)));
} else
printf("]");
}
break;
}
case SCTP_INITIATION :
{
const struct sctpInitiation *init;
printf("[INIT] ");
init=(const struct sctpInitiation*)(chunkDescPtr+1);
printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
#if(0) /* ALC you can add code for optional params here */
if( (init+1) < chunkEnd )
printf(" @@@@@ UNFINISHED @@@@@@%s\n",
"Optional params present, but not printed.");
#endif
break;
}
case SCTP_INITIATION_ACK :
{
const struct sctpInitiation *init;
printf("[INIT ACK] ");
init=(const struct sctpInitiation*)(chunkDescPtr+1);
printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
#if(0) /* ALC you can add code for optional params here */
if( (init+1) < chunkEnd )
printf(" @@@@@ 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;
printf("[SACK] ");
sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
printf("[#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++)
printf("\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++)
printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
EXTRACT_32BITS(dupTSN));
break;
}
case SCTP_HEARTBEAT_REQUEST :
{
const struct sctpHBsender *hb;
hb=(const struct sctpHBsender*)chunkDescPtr;
printf("[HB REQ] ");
break;
}
case SCTP_HEARTBEAT_ACK :
printf("[HB ACK] ");
break;
case SCTP_ABORT_ASSOCIATION :
printf("[ABORT] ");
break;
case SCTP_SHUTDOWN :
printf("[SHUTDOWN] ");
break;
case SCTP_SHUTDOWN_ACK :
printf("[SHUTDOWN ACK] ");
break;
case SCTP_OPERATION_ERR :
printf("[OP ERR] ");
break;
case SCTP_COOKIE_ECHO :
printf("[COOKIE ECHO] ");
break;
case SCTP_COOKIE_ACK :
printf("[COOKIE ACK] ");
break;
case SCTP_ECN_ECHO :
printf("[ECN ECHO] ");
break;
case SCTP_ECN_CWR :
printf("[ECN CWR] ");
break;
case SCTP_SHUTDOWN_COMPLETE :
printf("[SHUTDOWN COMPLETE] ");
break;
case SCTP_FORWARD_CUM_TSN :
printf("[FOR CUM TSN] ");
break;
case SCTP_RELIABLE_CNTL :
printf("[REL CTRL] ");
break;
case SCTP_RELIABLE_CNTL_ACK :
printf("[REL CTRL ACK] ");
break;
default :
printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
return;
}
if (vflag < 2)
sep = ", (";
}
return;
trunc:
printf("[|sctp]");
return;
}