X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/69cb46af9119e8b5554bcc4bf1bf36f39cb82131..5ef0bcb5edd748de9d9af13c40da0395dfdd94e8:/print-sctp.c diff --git a/print-sctp.c b/print-sctp.c index 6c41766d..9384a93d 100644 --- a/print-sctp.c +++ b/print-sctp.c @@ -33,19 +33,19 @@ * SUCH DAMAGE. */ +/* \summary: Stream Control Transmission Protocol (SCTP) printer */ + #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include +#include "netdissect-stdinc.h" -#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 /* Definitions from: * @@ -89,7 +89,7 @@ * 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. + * be incorporated into the next SCTP release. */ /* The valid defines for all message @@ -153,36 +153,36 @@ static const struct tok sctp_chunkid_str[] = { /* the sctp common header */ struct sctpHeader{ - uint16_t source; - uint16_t destination; - uint32_t verificationTag; - uint32_t adler32; + nd_uint16_t source; + nd_uint16_t destination; + nd_uint32_t verificationTag; + nd_uint32_t adler32; }; /* various descriptor parsers */ struct sctpChunkDesc{ - uint8_t chunkID; - uint8_t chunkFlg; - uint16_t chunkLength; + nd_uint8_t chunkID; + nd_uint8_t chunkFlg; + nd_uint16_t chunkLength; }; struct sctpParamDesc{ - uint16_t paramType; - uint16_t paramLength; + nd_uint16_t paramType; + nd_uint16_t paramLength; }; struct sctpRelChunkDesc{ struct sctpChunkDesc chk; - uint32_t serialNumber; + nd_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; + nd_uint32_t vendorId; /* vendor ID from RFC 1700 */ + nd_uint16_t vendorSpecificType; + nd_uint16_t vendorSpecificLen; }; @@ -194,57 +194,40 @@ struct sctpVendorSpecificParam { /* 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; + nd_uint32_t initTag; /* tag of mine */ + nd_uint32_t rcvWindowCredit; /* rwnd */ + nd_uint16_t NumPreopenStreams; /* OS */ + nd_uint16_t MaxInboundStreams; /* MIS */ + nd_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; + nd_ipv4 ipAddress; }; struct sctpV6IpAddress{ struct sctpParamDesc p; /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */ - uint8_t ipAddress[16]; + nd_ipv6 ipAddress; }; struct sctpDNSName{ struct sctpParamDesc param; - uint8_t name[1]; + nd_byte name[1]; }; struct sctpCookiePreserve{ struct sctpParamDesc p; /* type is set to SCTP_COOKIE_PRESERVE, len=8 */ - uint32_t extraTime; + nd_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. - */ + nd_uint32_t ts_sec; + nd_uint32_t ts_usec; }; @@ -266,21 +249,21 @@ struct sctpSendableInit{ /* Selective Acknowledgement * has the following structure with - * a optional ammount of trailing int's + * a optional amount 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; + nd_uint32_t highestConseqTSN; + nd_uint32_t updatedRwnd; + nd_uint16_t numberOfdesc; + nd_uint16_t numDupTsns; }; struct sctpSelectiveFrag{ - uint16_t fragmentStart; - uint16_t fragmentEnd; + nd_uint16_t fragmentStart; + nd_uint16_t fragmentEnd; }; @@ -289,33 +272,6 @@ struct sctpUnifiedSack{ 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. @@ -332,15 +288,15 @@ struct sctpUnifiedAbortLight{ struct sctpUnifiedAbortHeavy{ struct sctpHeader mh; struct sctpChunkDesc uh; - uint16_t causeCode; - uint16_t causeLen; + nd_uint16_t causeCode; + nd_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; + nd_uint32_t TSN_Seen; }; struct sctpUnifiedShutdown{ @@ -353,8 +309,8 @@ struct sctpUnifiedShutdown{ * that is defined as a operation error. */ struct sctpOpErrorCause{ - uint16_t cause; - uint16_t causeLen; + nd_uint16_t cause; + nd_uint16_t causeLen; }; struct sctpUnifiedOpError{ @@ -366,15 +322,15 @@ struct sctpUnifiedStreamError{ struct sctpHeader mh; struct sctpChunkDesc uh; struct sctpOpErrorCause c; - uint16_t strmNum; - uint16_t reserved; + nd_uint16_t strmNum; + nd_uint16_t reserved; }; struct staleCookieMsg{ struct sctpHeader mh; struct sctpChunkDesc uh; struct sctpOpErrorCause c; - uint32_t moretime; + nd_uint32_t moretime; }; /* the following is used in all sends @@ -387,10 +343,10 @@ struct sctpUnifiedSingleMsg{ }; struct sctpDataPart{ - uint32_t TSN; - uint16_t streamId; - uint16_t sequence; - uint32_t payloadtype; + nd_uint32_t TSN; + nd_uint16_t streamId; + nd_uint16_t sequence; + nd_uint32_t payloadtype; }; struct sctpUnifiedDatagram{ @@ -400,13 +356,13 @@ struct sctpUnifiedDatagram{ struct sctpECN_echo{ struct sctpChunkDesc uh; - uint32_t Lowest_TSN; + nd_uint32_t Lowest_TSN; }; struct sctpCWR{ struct sctpChunkDesc uh; - uint32_t TSN_reduced_at; + nd_uint32_t TSN_reduced_at; }; static const struct tok ForCES_channels[] = { @@ -478,7 +434,8 @@ static const struct tok PayloadProto_idents[] = { }; -static inline int isForCES_port(u_short Port) +static int +isForCES_port(u_short Port) { if (Port == CHAN_HP) return 1; @@ -490,155 +447,150 @@ static inline int isForCES_port(u_short Port) 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 */ +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 void *endPacketPtr; + uint8_t chunkID; u_short sourcePort, destPort; - int chunkCount; + u_int chunkCount; const struct sctpChunkDesc *chunkDescPtr; - const void *nextChunk; 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; - endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength; + ND_TCHECK_SIZE(sctpPktHdr); + sctpPacketLengthRemaining = sctpPacketLength; + + sourcePort = GET_BE_U_2(sctpPktHdr->source); + destPort = GET_BE_U_2(sctpPktHdr->destination); - if( (u_long) endPacketPtr > (u_long) ndo->ndo_snapend) - endPacketPtr = (const void *) ndo->ndo_snapend; ip = (const 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), + ND_PRINT("%s.%u > %s.%u: sctp", + ip6addr_string(ndo, ip6->ip6_src), sourcePort, - ip6addr_string(ndo, &ip6->ip6_dst), - destPort)); + ip6addr_string(ndo, ip6->ip6_dst), + destPort); } else -#endif /*INET6*/ { - ND_PRINT((ndo, "%s.%d > %s.%d: sctp", - ipaddr_string(ndo, &ip->ip_src), + ND_PRINT("%s.%u > %s.%u: sctp", + ipaddr_string(ndo, ip->ip_src), sourcePort, - ipaddr_string(ndo, &ip->ip_dst), - destPort)); + ipaddr_string(ndo, ip->ip_dst), + destPort); } if (isForCES_port(sourcePort)) { - ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort))); - isforces = 1; + ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, sourcePort)); + isforces = 1; } if (isForCES_port(destPort)) { - ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort))); - isforces = 1; + 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 *) - ((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++) { - uint16_t chunkLength; - const u_char *chunkEnd; + uint16_t chunkLength, chunkLengthRemaining; uint16_t align; - ND_TCHECK(*chunkDescPtr); - chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength); + 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 = GET_BE_U_2(chunkDescPtr->chunkLength); if (chunkLength < sizeof(*chunkDescPtr)) { - ND_PRINT((ndo, "%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength)); - break; + ND_PRINT("%s%u) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength); + break; } + chunkLengthRemaining = chunkLength; - ND_TCHECK2(*((const uint8_t *)chunkDescPtr), chunkLength); - chunkEnd = ((const u_char*)chunkDescPtr + chunkLength); - - align=chunkLength % 4; + align = chunkLength % 4; if (align != 0) align = 4 - align; - nextChunk = (const void *) (chunkEnd + 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((ndo, "%s%d) ", sep, chunkCount+1)); - ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x", - chunkDescPtr->chunkID))); - switch (chunkDescPtr->chunkID) + ND_PRINT("%s%u) ", sep, chunkCount+1); + chunkID = GET_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; - 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))); + uint16_t payload_size; + + chunkFlg = GET_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 = GET_BE_U_4(dataHdrPtr->payloadtype); + ND_PRINT("[TSN: %u] ", GET_BE_U_4(dataHdrPtr->TSN)); + ND_PRINT("[SID: %u] ", GET_BE_U_2(dataHdrPtr->streamId)); + ND_PRINT("[SSEQ %u] ", GET_BE_U_2(dataHdrPtr->sequence)); + ND_PRINT("[PPID %s] ", + tok2str(PayloadProto_idents, "0x%x", ppid)); if (!isforces) { isforces = (ppid == SCTP_PPID_FORCES_HP) || @@ -646,114 +598,179 @@ void sctp_print(netdissect_options *ndo, (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))); + bp += sizeof(*dataHdrPtr); + sctpPacketLengthRemaining -= sizeof(*dataHdrPtr); + chunkLengthRemaining -= sizeof(*dataHdrPtr); + payload_size = chunkLengthRemaining; + if (payload_size == 0) { + ND_PRINT("bogus chunk length %u]", chunkLength); return; } - payload_size = EXTRACT_16BITS(&chunkDescPtr->chunkLength) - - (sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc)); - if (isforces) { - forces_print(ndo, payloadPtr, payload_size); + forces_print(ndo, bp, payload_size); + /* ndo_protocol reassignment after forces_print() call */ + ndo->ndo_protocol = "sctp"; } 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); + m3ua_print(ndo, bp, payload_size); + /* ndo_protocol reassignment after m3ua_print() call */ + ndo->ndo_protocol = "sctp"; break; default: - ND_PRINT((ndo, "[Payload")); + ND_PRINT("[Payload"); if (!ndo->ndo_suppress_default_print) { - ND_PRINT((ndo, ":")); - ND_DEFAULTPRINT(payloadPtr, payload_size); + ND_PRINT(":"); + ND_DEFAULTPRINT(bp, payload_size); } - ND_PRINT((ndo, "]")); + ND_PRINT("]"); break; } } + bp += payload_size; + sctpPacketLengthRemaining -= payload_size; + chunkLengthRemaining -= payload_size; 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.")); + if (chunkLengthRemaining < sizeof(*init)) { + ND_PRINT("bogus chunk length %u]", chunkLength); + return; + } + init=(const struct sctpInitiation*)bp; + ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag)); + ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit)); + ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams)); + ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams)); + ND_PRINT("[init TSN: %u] ", GET_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; - 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.")); + if (chunkLengthRemaining < sizeof(*init)) { + ND_PRINT("bogus chunk length %u]", chunkLength); + return; + } + init=(const struct sctpInitiation*)bp; + ND_PRINT("[init tag: %u] ", GET_BE_U_4(init->initTag)); + ND_PRINT("[rwnd: %u] ", GET_BE_U_4(init->rcvWindowCredit)); + ND_PRINT("[OS: %u] ", GET_BE_U_2(init->NumPreopenStreams)); + ND_PRINT("[MIS: %u] ", GET_BE_U_2(init->MaxInboundStreams)); + ND_PRINT("[init TSN: %u] ", GET_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; - int fragNo, tsnNo; + u_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))); + if (chunkLengthRemaining < sizeof(*sack)) { + ND_PRINT("bogus chunk length %u]", chunkLength); + return; + } + sack=(const struct sctpSelectiveAck*)bp; + ND_PRINT("[cum ack %u] ", GET_BE_U_4(sack->highestConseqTSN)); + ND_PRINT("[a_rwnd %u] ", GET_BE_U_4(sack->updatedRwnd)); + ND_PRINT("[#gap acks %u] ", GET_BE_U_2(sack->numberOfdesc)); + ND_PRINT("[#dup tsns %u] ", GET_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 < EXTRACT_16BITS(&sack->numberOfdesc); - frag++, fragNo++) - ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ", + for (fragNo=0; + chunkLengthRemaining != 0 && fragNo < GET_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_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart), - EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd))); - + GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentStart), + GET_BE_U_4(sack->highestConseqTSN) + GET_BE_U_2(frag->fragmentEnd)); + } /* print duplicate TSNs */ - for (dupTSN = (const u_char *)frag, tsnNo=0; - (const void *) dupTSN < nextChunk && tsnNonumDupTsns); - dupTSN += 4, tsnNo++) - ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1, - EXTRACT_32BITS(dupTSN))); - + for (tsnNo=0; + chunkLengthRemaining != 0 && tsnNonumDupTsns); + 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, + GET_BE_U_4(dupTSN)); + } + break; + } + default : + { + bp += chunkLengthRemaining; + sctpPacketLengthRemaining -= chunkLengthRemaining; + chunkLengthRemaining = 0; break; } } - if (ndo->ndo_vflag < 2) - sep = ", ("; + /* + * 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((ndo, "[|sctp]")); + nd_print_trunc(ndo); }