X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/3d932490b826facb568937a1290910a1265267f5..d7b497cac78b6e22a66a6bae9bdec60a8044f67a:/print-sctp.c diff --git a/print-sctp.c b/print-sctp.c index dca31228..9f169654 100644 --- a/print-sctp.c +++ b/print-sctp.c @@ -33,153 +33,587 @@ * SUCH DAMAGE. */ -#ifndef lint -static const char rcsid[] = -"@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.10 2002-08-01 08:53:27 risso Exp $ (NETLAB/PEL)"; -#endif +/* \summary: Stream Control Transmission Protocol (SCTP) printer */ #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include - -#include "sctpHeader.h" -#include "sctpConstants.h" -#include +#include -#include -#include - -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" -#include "extract.h" /* must come after interface.h */ +#include "extract.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 */ +/* Definitions from: + * + * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola + * + * 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 Cisco nor of Motorola 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. + * + * This file is part of the SCTP reference Implementation + * + * + * Please send any bug reports or fixes you make to one of the following email + * addresses: + * + * rstewar1@email.mot.com + * kmorneau@cisco.com + * qxie1@email.mot.com + * + * Any bugs reported given to us we will try to fix... any fixes shared will + * be incorperated into the next SCTP release. + */ + +/* The valid defines for all message + * types know to SCTP. 0 is reserved + */ +#define SCTP_DATA 0x00 +#define SCTP_INITIATION 0x01 +#define SCTP_INITIATION_ACK 0x02 +#define SCTP_SELECTIVE_ACK 0x03 +#define SCTP_HEARTBEAT_REQUEST 0x04 +#define SCTP_HEARTBEAT_ACK 0x05 +#define SCTP_ABORT_ASSOCIATION 0x06 +#define SCTP_SHUTDOWN 0x07 +#define SCTP_SHUTDOWN_ACK 0x08 +#define SCTP_OPERATION_ERR 0x09 +#define SCTP_COOKIE_ECHO 0x0a +#define SCTP_COOKIE_ACK 0x0b +#define SCTP_ECN_ECHO 0x0c +#define SCTP_ECN_CWR 0x0d +#define SCTP_SHUTDOWN_COMPLETE 0x0e +#define SCTP_FORWARD_CUM_TSN 0xc0 +#define SCTP_RELIABLE_CNTL 0xc1 +#define SCTP_RELIABLE_CNTL_ACK 0xc2 + +static const struct tok sctp_chunkid_str[] = { + { SCTP_DATA, "DATA" }, + { SCTP_INITIATION, "INIT" }, + { SCTP_INITIATION_ACK, "INIT ACK" }, + { SCTP_SELECTIVE_ACK, "SACK" }, + { SCTP_HEARTBEAT_REQUEST, "HB REQ" }, + { SCTP_HEARTBEAT_ACK, "HB ACK" }, + { SCTP_ABORT_ASSOCIATION, "ABORT" }, + { SCTP_SHUTDOWN, "SHUTDOWN" }, + { SCTP_SHUTDOWN_ACK, "SHUTDOWN ACK" }, + { SCTP_OPERATION_ERR, "OP ERR" }, + { SCTP_COOKIE_ECHO, "COOKIE ECHO" }, + { SCTP_COOKIE_ACK, "COOKIE ACK" }, + { SCTP_ECN_ECHO, "ECN ECHO" }, + { SCTP_ECN_CWR, "ECN CWR" }, + { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" }, + { SCTP_FORWARD_CUM_TSN, "FOR CUM TSN" }, + { SCTP_RELIABLE_CNTL, "REL CTRL" }, + { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK" }, + { 0, NULL } +}; + +/* Data Chuck Specific Flags */ +#define SCTP_DATA_FRAG_MASK 0x03 +#define SCTP_DATA_MIDDLE_FRAG 0x00 +#define SCTP_DATA_LAST_FRAG 0x01 +#define SCTP_DATA_FIRST_FRAG 0x02 +#define SCTP_DATA_NOT_FRAG 0x03 +#define SCTP_DATA_UNORDERED 0x04 + +#define SCTP_ADDRMAX 60 + +#define CHAN_HP 6704 +#define CHAN_MP 6705 +#define CHAN_LP 6706 + +/* the sctp common header */ + +struct sctpHeader{ + uint16_t source; + uint16_t destination; + uint32_t verificationTag; + uint32_t adler32; +}; + +/* various descriptor parsers */ + +struct sctpChunkDesc{ + uint8_t chunkID; + uint8_t chunkFlg; + uint16_t chunkLength; +}; + +struct sctpParamDesc{ + uint16_t paramType; + uint16_t paramLength; +}; + + +struct sctpRelChunkDesc{ + struct sctpChunkDesc chk; + uint32_t serialNumber; +}; + +struct sctpVendorSpecificParam { + struct sctpParamDesc p; /* type must be 0xfffe */ + uint32_t vendorId; /* vendor ID from RFC 1700 */ + uint16_t vendorSpecificType; + uint16_t vendorSpecificLen; +}; + + +/* Structures for the control parts */ + + + +/* Sctp association init request/ack */ + +/* this is used for init ack, too */ +struct sctpInitiation{ + uint32_t initTag; /* tag of mine */ + uint32_t rcvWindowCredit; /* rwnd */ + uint16_t NumPreopenStreams; /* OS */ + uint16_t MaxInboundStreams; /* MIS */ + uint32_t initialTSN; + /* optional param's follow in sctpParamDesc form */ +}; + +struct sctpV4IpAddress{ + struct sctpParamDesc p; /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */ + uint32_t ipAddress; +}; + + +struct sctpV6IpAddress{ + struct sctpParamDesc p; /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */ + uint8_t ipAddress[16]; +}; + +struct sctpDNSName{ + struct sctpParamDesc param; + uint8_t name[1]; +}; + + +struct sctpCookiePreserve{ + struct sctpParamDesc p; /* type is set to SCTP_COOKIE_PRESERVE, len=8 */ + uint32_t extraTime; +}; + + +struct sctpTimeStamp{ + uint32_t ts_sec; + uint32_t ts_usec; +}; + +/* wire structure of my cookie */ +struct cookieMessage{ + uint32_t TieTag_curTag; /* copied from assoc if present */ + uint32_t TieTag_hisTag; /* copied from assoc if present */ + int32_t cookieLife; /* life I will award this cookie */ + struct sctpTimeStamp timeEnteringState; /* the time I built cookie */ + struct sctpInitiation initAckISent; /* the INIT-ACK that I sent to my peer */ + uint32_t addressWhereISent[4]; /* I make this 4 ints so I get 128bits for future */ + int32_t addrtype; /* address type */ + uint16_t locScope; /* V6 local scope flag */ + uint16_t siteScope; /* V6 site scope flag */ + /* at the end is tacked on the INIT chunk sent in + * its entirety and of course our + * signature. + */ +}; + + +/* this guy is for use when + * I have a initiate message gloming the + * things together. + + */ +struct sctpUnifiedInit{ + struct sctpChunkDesc uh; + struct sctpInitiation initm; +}; + +struct sctpSendableInit{ + struct sctpHeader mh; + struct sctpUnifiedInit msg; +}; + + +/* Selective Acknowledgement + * has the following structure with + * a optional ammount of trailing int's + * on the last part (based on the numberOfDesc + * field). + */ + +struct sctpSelectiveAck{ + uint32_t highestConseqTSN; + uint32_t updatedRwnd; + uint16_t numberOfdesc; + uint16_t numDupTsns; +}; + +struct sctpSelectiveFrag{ + uint16_t fragmentStart; + uint16_t fragmentEnd; +}; + + +struct sctpUnifiedSack{ + struct sctpChunkDesc uh; + struct sctpSelectiveAck sack; +}; + +/* for both RTT request/response the + * following is sent + */ + +struct sctpHBrequest { + uint32_t time_value_1; + uint32_t time_value_2; +}; + +/* here is what I read and respond with to. */ +struct sctpHBunified{ + struct sctpChunkDesc hdr; + struct sctpParamDesc hb; +}; + + +/* here is what I send */ +struct sctpHBsender{ + struct sctpChunkDesc hdr; + struct sctpParamDesc hb; + struct sctpHBrequest rtt; + int8_t addrFmt[SCTP_ADDRMAX]; + uint16_t userreq; +}; + + + +/* for the abort and shutdown ACK + * we must carry the init tag in the common header. Just the + * common header is all that is needed with a chunk descriptor. + */ +struct sctpUnifiedAbort{ + struct sctpChunkDesc uh; +}; + +struct sctpUnifiedAbortLight{ + struct sctpHeader mh; + struct sctpChunkDesc uh; +}; + +struct sctpUnifiedAbortHeavy{ + struct sctpHeader mh; + struct sctpChunkDesc uh; + uint16_t causeCode; + uint16_t causeLen; +}; + +/* For the graceful shutdown we must carry + * the tag (in common header) and the highest consequitive acking value + */ +struct sctpShutdown { + uint32_t TSN_Seen; +}; + +struct sctpUnifiedShutdown{ + struct sctpChunkDesc uh; + struct sctpShutdown shut; +}; + +/* in the unified message we add the trailing + * stream id since it is the only message + * that is defined as a operation error. + */ +struct sctpOpErrorCause{ + uint16_t cause; + uint16_t causeLen; +}; + +struct sctpUnifiedOpError{ + struct sctpChunkDesc uh; + struct sctpOpErrorCause c; +}; + +struct sctpUnifiedStreamError{ + struct sctpHeader mh; + struct sctpChunkDesc uh; + struct sctpOpErrorCause c; + uint16_t strmNum; + uint16_t reserved; +}; + +struct staleCookieMsg{ + struct sctpHeader mh; + struct sctpChunkDesc uh; + struct sctpOpErrorCause c; + uint32_t moretime; +}; + +/* the following is used in all sends + * where nothing is needed except the + * chunk/type i.e. shutdownAck Abort */ + +struct sctpUnifiedSingleMsg{ + struct sctpHeader mh; + struct sctpChunkDesc uh; +}; + +struct sctpDataPart{ + uint32_t TSN; + uint16_t streamId; + uint16_t sequence; + uint32_t payloadtype; +}; + +struct sctpUnifiedDatagram{ + struct sctpChunkDesc uh; + struct sctpDataPart dp; +}; + +struct sctpECN_echo{ + struct sctpChunkDesc uh; + uint32_t Lowest_TSN; +}; + + +struct sctpCWR{ + struct sctpChunkDesc uh; + uint32_t TSN_reduced_at; +}; + +static const struct tok ForCES_channels[] = { + { CHAN_HP, "ForCES HP" }, + { CHAN_MP, "ForCES MP" }, + { CHAN_LP, "ForCES LP" }, + { 0, NULL } +}; + +/* data chunk's payload protocol identifiers */ + +#define SCTP_PPID_IUA 1 +#define SCTP_PPID_M2UA 2 +#define SCTP_PPID_M3UA 3 +#define SCTP_PPID_SUA 4 +#define SCTP_PPID_M2PA 5 +#define SCTP_PPID_V5UA 6 +#define SCTP_PPID_H248 7 +#define SCTP_PPID_BICC 8 +#define SCTP_PPID_TALI 9 +#define SCTP_PPID_DUA 10 +#define SCTP_PPID_ASAP 11 +#define SCTP_PPID_ENRP 12 +#define SCTP_PPID_H323 13 +#define SCTP_PPID_QIPC 14 +#define SCTP_PPID_SIMCO 15 +#define SCTP_PPID_DDPSC 16 +#define SCTP_PPID_DDPSSC 17 +#define SCTP_PPID_S1AP 18 +#define SCTP_PPID_RUA 19 +#define SCTP_PPID_HNBAP 20 +#define SCTP_PPID_FORCES_HP 21 +#define SCTP_PPID_FORCES_MP 22 +#define SCTP_PPID_FORCES_LP 23 +#define SCTP_PPID_SBC_AP 24 +#define SCTP_PPID_NBAP 25 +/* 26 */ +#define SCTP_PPID_X2AP 27 + +static const struct tok PayloadProto_idents[] = { + { SCTP_PPID_IUA, "ISDN Q.921" }, + { SCTP_PPID_M2UA, "M2UA" }, + { SCTP_PPID_M3UA, "M3UA" }, + { SCTP_PPID_SUA, "SUA" }, + { SCTP_PPID_M2PA, "M2PA" }, + { SCTP_PPID_V5UA, "V5.2" }, + { SCTP_PPID_H248, "H.248" }, + { SCTP_PPID_BICC, "BICC" }, + { SCTP_PPID_TALI, "TALI" }, + { SCTP_PPID_DUA, "DUA" }, + { SCTP_PPID_ASAP, "ASAP" }, + { SCTP_PPID_ENRP, "ENRP" }, + { SCTP_PPID_H323, "H.323" }, + { SCTP_PPID_QIPC, "Q.IPC" }, + { SCTP_PPID_SIMCO, "SIMCO" }, + { SCTP_PPID_DDPSC, "DDPSC" }, + { SCTP_PPID_DDPSSC, "DDPSSC" }, + { SCTP_PPID_S1AP, "S1AP" }, + { SCTP_PPID_RUA, "RUA" }, + { SCTP_PPID_HNBAP, "HNBAP" }, + { SCTP_PPID_FORCES_HP, "ForCES HP" }, + { SCTP_PPID_FORCES_MP, "ForCES MP" }, + { SCTP_PPID_FORCES_LP, "ForCES LP" }, + { SCTP_PPID_SBC_AP, "SBc-AP" }, + { SCTP_PPID_NBAP, "NBAP" }, + /* 26 */ + { SCTP_PPID_X2AP, "X2AP" }, + { 0, NULL } +}; + + +static inline int isForCES_port(u_short Port) +{ + if (Port == CHAN_HP) + return 1; + if (Port == CHAN_MP) + return 1; + if (Port == CHAN_LP) + return 1; + + return 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 */ { + u_int sctpPacketLengthRemaining; 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; - } + const char *sep; + int isforces = 0; if (sctpPacketLength < sizeof(struct sctpHeader)) { - (void)printf("truncated-sctp - %ld bytes missing!", - (long)sctpPacketLength-sizeof(struct sctpHeader)); + ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!", + (long)(sizeof(struct sctpHeader) - sctpPacketLength))); return; } + sctpPktHdr = (const struct sctpHeader*) bp; + ND_TCHECK(*sctpPktHdr); + sctpPacketLengthRemaining = sctpPacketLength; - /* sctpPacketLength -= sizeof(struct sctpHeader); packet length */ - /* is now only as long as the payload */ + sourcePort = EXTRACT_BE_U_2(&sctpPktHdr->source); + destPort = EXTRACT_BE_U_2(&sctpPktHdr->destination); - sourcePort = ntohs(sctpPktHdr->source); - destPort = ntohs(sctpPktHdr->destination); + ip = (const struct ip *)bp2; + if (IP_V(ip) == 6) + ip6 = (const struct ip6_hdr *)bp2; + else + ip6 = NULL; -#ifdef INET6 if (ip6) { - if (ip6->ip6_nxt == IPPROTO_SCTP) { - (void)printf("%s.%d > %s.%d: sctp", - ip6addr_string(&ip6->ip6_src), - sourcePort, - ip6addr_string(&ip6->ip6_dst), - destPort); - } else { - (void)printf("%d > %d: sctp", - sourcePort, destPort); - } + 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*/ { - if (ip->ip_p == IPPROTO_SCTP) { - (void)printf("%s.%d > %s.%d: sctp", - ipaddr_string(&ip->ip_src), - sourcePort, - ipaddr_string(&ip->ip_dst), - destPort); - } else { - (void)printf("%d > %d: sctp", - sourcePort, destPort); - } + ND_PRINT((ndo, "%s.%d > %s.%d: sctp", + ipaddr_string(ndo, &ip->ip_src), + sourcePort, + ipaddr_string(ndo, &ip->ip_dst), + destPort)); } - fflush(stdout); - if (vflag < 2) - return; + 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; + } + + 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 *) - ((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++) + for (chunkCount = 0, chunkDescPtr = (const struct sctpChunkDesc *)bp; + sctpPacketLengthRemaining != 0; + chunkCount++) { - u_short align; - const u_char *chunkEnd; - - chunkEnd = ((const u_char*)chunkDescPtr + ntohs(chunkDescPtr->chunkLength)); - - align=ntohs(chunkDescPtr->chunkLength) % 4; + uint16_t chunkLength, chunkLengthRemaining; + uint16_t align; + + chunkDescPtr = (const struct sctpChunkDesc *)bp; + if (sctpPacketLengthRemaining < sizeof(*chunkDescPtr)) { + ND_PRINT((ndo, "%s%d) [chunk descriptor cut off at end of packet]", sep, chunkCount+1)); + break; + } + ND_TCHECK(*chunkDescPtr); + chunkLength = EXTRACT_BE_U_2(&chunkDescPtr->chunkLength); + if (chunkLength < sizeof(*chunkDescPtr)) { + ND_PRINT((ndo, "%s%d) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength)); + break; + } + chunkLengthRemaining = chunkLength; + + align = chunkLength % 4; if (align != 0) align = 4 - align; - nextChunk = (const void *) (chunkEnd + align); + if (sctpPacketLengthRemaining < align) { + ND_PRINT((ndo, "%s%d) [Bad chunk length %u, > remaining data in packet]", sep, chunkCount+1, chunkLength)); + break; + } + + ND_TCHECK2(*bp, chunkLength); - printf("\n\t%d) ", chunkCount+1); + bp += sizeof(*chunkDescPtr); + sctpPacketLengthRemaining -= sizeof(*chunkDescPtr); + chunkLengthRemaining -= sizeof(*chunkDescPtr); + + 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; - - printf("[DATA] "); + uint32_t ppid; + u_int payload_size; if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED) - printf("(U)"); + ND_PRINT((ndo, "(U)")); if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) - printf("(B)"); + ND_PRINT((ndo, "(B)")); if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) - printf("(E)"); + ND_PRINT((ndo, "(E)")); if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED) @@ -189,69 +623,113 @@ void sctp_print(const u_char *bp, /* beginning of sctp packet */ || ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG) == SCTP_DATA_LAST_FRAG) ) - printf(" "); - - dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1); - - printf("[TSN: %u] ", (u_int32_t)ntohl(dataHdrPtr->TSN)); - printf("[SID: %u] ", ntohs(dataHdrPtr->streamId)); - printf("[SSEQ %u] ", ntohs(dataHdrPtr->sequence)); - printf("[PPID 0x%x] ", (u_int32_t)ntohl(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(":"); - default_print(payloadPtr, - htons(chunkDescPtr->chunkLength)-1 - - sizeof(struct sctpDataPart)-sizeof(struct sctpChunkDesc)); - } else - printf("]"); - } + ND_PRINT((ndo, " ")); + + if (chunkLengthRemaining < sizeof(*dataHdrPtr)) { + ND_PRINT((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + dataHdrPtr=(const struct sctpDataPart*)bp; + + ppid = EXTRACT_BE_U_4(&dataHdrPtr->payloadtype); + ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_BE_U_4(&dataHdrPtr->TSN))); + ND_PRINT((ndo, "[SID: %u] ", EXTRACT_BE_U_2(&dataHdrPtr->streamId))); + ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_BE_U_2(&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); + } + + bp += sizeof(*dataHdrPtr); + sctpPacketLengthRemaining -= sizeof(*dataHdrPtr); + chunkLengthRemaining -= sizeof(*dataHdrPtr); + payload_size = chunkLengthRemaining; + if (payload_size == 0) { + ND_PRINT((ndo, "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((ndo, "[Payload")); + if (!ndo->ndo_suppress_default_print) { + ND_PRINT((ndo, ":")); + ND_DEFAULTPRINT(bp, payload_size); + } + ND_PRINT((ndo, "]")); + break; + } + } + bp += payload_size; + sctpPacketLengthRemaining -= payload_size; + chunkLengthRemaining -= payload_size; break; } case SCTP_INITIATION : { const struct sctpInitiation *init; - printf("[INIT] "); - init=(const struct sctpInitiation*)(chunkDescPtr+1); - printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag)); - printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit)); - printf("[OS: %u] ", ntohs(init->NumPreopenStreams)); - printf("[MIS: %u] ", ntohs(init->MaxInboundStreams)); - printf("[init TSN: %u] ", (u_int32_t)ntohl(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."); + if (chunkLengthRemaining < sizeof(*init)) { + ND_PRINT((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + init=(const struct sctpInitiation*)bp; + ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_BE_U_4(&init->initTag))); + ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_BE_U_4(&init->rcvWindowCredit))); + ND_PRINT((ndo, "[OS: %u] ", EXTRACT_BE_U_2(&init->NumPreopenStreams))); + ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_BE_U_2(&init->MaxInboundStreams))); + ND_PRINT((ndo, "[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((ndo, " @@@@@ 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; - printf("[INIT ACK] "); - init=(const struct sctpInitiation*)(chunkDescPtr+1); - printf("[init tag: %u] ", (u_int32_t)ntohl(init->initTag)); - printf("[rwnd: %u] ", (u_int32_t)ntohl(init->rcvWindowCredit)); - printf("[OS: %u] ", ntohs(init->NumPreopenStreams)); - printf("[MIS: %u] ", ntohs(init->MaxInboundStreams)); - printf("[init TSN: %u] ", (u_int32_t)ntohl(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."); + if (chunkLengthRemaining < sizeof(*init)) { + ND_PRINT((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + init=(const struct sctpInitiation*)bp; + ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_BE_U_4(&init->initTag))); + ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_BE_U_4(&init->rcvWindowCredit))); + ND_PRINT((ndo, "[OS: %u] ", EXTRACT_BE_U_2(&init->NumPreopenStreams))); + ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_BE_U_2(&init->MaxInboundStreams))); + ND_PRINT((ndo, "[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((ndo, " @@@@@ UNFINISHED @@@@@@%s\n", + "Optional params present, but not printed.")); #endif + bp += chunkLengthRemaining; + sctpPacketLengthRemaining -= chunkLengthRemaining; + chunkLengthRemaining = 0; break; } case SCTP_SELECTIVE_ACK: @@ -259,89 +737,82 @@ void sctp_print(const u_char *bp, /* beginning of sctp packet */ 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] ", (u_int32_t)ntohl(sack->highestConseqTSN)); - printf("[a_rwnd %u] ", (u_int32_t)ntohl(sack->updatedRwnd)); - printf("[#gap acks %u] ", ntohs(sack->numberOfdesc)); - printf("[#dup tsns %u] ", ntohs(sack->numDupTsns)); + const u_char *dupTSN; + + if (chunkLengthRemaining < sizeof(*sack)) { + ND_PRINT((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + sack=(const struct sctpSelectiveAck*)bp; + ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_BE_U_4(&sack->highestConseqTSN))); + ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_BE_U_4(&sack->updatedRwnd))); + ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_BE_U_2(&sack->numberOfdesc))); + ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_BE_U_2(&sack->numDupTsns))); + bp += sizeof(*sack); + sctpPacketLengthRemaining -= sizeof(*sack); + chunkLengthRemaining -= sizeof(*sack); /* print gaps */ - for (frag = ( (const struct sctpSelectiveFrag *) - ((const struct sctpSelectiveAck *) sack+1)), - fragNo=0; - (const void *)frag < nextChunk && fragNo < ntohs(sack->numberOfdesc); - frag++, fragNo++) - printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ", + 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((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + frag = (const struct sctpSelectiveFrag *)bp; + ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ", fragNo+1, - (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentStart)), - (u_int32_t)(ntohl(sack->highestConseqTSN) + ntohs(frag->fragmentEnd))); - + 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 (dupTSN = (const u_long*)frag, tsnNo=0; - (const void *) dupTSN < nextChunk && tsnNonumDupTsns); - dupTSN++, tsnNo++) - printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1, - (u_int32_t)ntohl(*dupTSN)); - + for (tsnNo=0; + chunkLengthRemaining != 0 && tsnNonumDupTsns); + bp += 4, sctpPacketLengthRemaining -= 4, chunkLengthRemaining -= 4, tsnNo++) { + if (chunkLengthRemaining < 4) { + ND_PRINT((ndo, "bogus chunk length %u]", chunkLength)); + return; + } + dupTSN = (const u_char *)bp; + ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1, + EXTRACT_BE_U_4(dupTSN))); + } break; } - case SCTP_HEARTBEAT_REQUEST : + default : { - const struct sctpHBsender *hb; - - hb=(const struct sctpHBsender*)chunkDescPtr; - - printf("[HB REQ] "); - + bp += chunkLengthRemaining; + sctpPacketLengthRemaining -= chunkLengthRemaining; + chunkLengthRemaining = 0; 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; } + + /* + * 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_TCHECK2(*bp, align); + bp += align; + sctpPacketLengthRemaining -= align; + } } + return; + +trunc: + ND_PRINT((ndo, "[|sctp]")); }