/* $NetBSD: print-sctp.c,v 1.6 2004/09/27 23:04:25 dyoung Exp $ */ /* Copyright (c) 2001 NETLAB, Temple University * Copyright (c) 2001 Protocol Engineering Lab, University of Delaware * * Jerry Heinz * John Fiore * Armando L. Caro Jr. * * 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. */ #include #ifndef lint #if 0 static const char rcsid[] _U_ = "@(#) Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.13.2.2 2003/11/16 08:51:44 guy Exp (NETLAB/PEL)"; #else __RCSID("$NetBSD: print-sctp.c,v 1.6 2004/09/27 23:04:25 dyoung Exp $"); #endif #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "sctpHeader.h" #include "sctpConstants.h" #include #include #include #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 u_char *cp; const void *endPacketPtr; u_short sourcePort, destPort; int chunkCount; const struct sctpChunkDesc *chunkDescPtr; const void *nextChunk; 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*/ cp = (const u_char *)(sctpPktHdr + 1); if (cp > snapend) { printf("[|sctp]"); return; } 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) return; /* 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_short align; const u_char *chunkEnd; chunkEnd = ((const u_char*)chunkDescPtr + EXTRACT_16BITS(&chunkDescPtr->chunkLength)); align=EXTRACT_16BITS(&chunkDescPtr->chunkLength) % 4; if (align != 0) align = 4 - align; nextChunk = (const void *) (chunkEnd + align); printf("\n\t%d) ", 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) /* if verbose output is specified */ { /* at the command line */ const u_char *payloadPtr; printf("[Payload"); if (!xflag && !qflag) { payloadPtr = (const u_char *) (++dataHdrPtr); printf(":"); if (htons(chunkDescPtr->chunkLength) < sizeof(struct sctpDataPart)+ sizeof(struct sctpChunkDesc)+1) { printf("bogus chunk length %u]", htons(chunkDescPtr->chunkLength)); return; } default_print(payloadPtr, htons(chunkDescPtr->chunkLength) - (sizeof(struct sctpDataPart)+ sizeof(struct sctpChunkDesc)+1)); } 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_long *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_long*)frag, tsnNo=0; (const void *) dupTSN < nextChunk && tsnNonumDupTsns); dupTSN++, 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; } } }