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+/* 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.
+ */
+
+/* \summary: Stream Control Transmission Protocol (SCTP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+#include "ip.h"
+#include "ip6.h"
+
+/* 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 incorporated 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{
+ nd_uint16_t source;
+ nd_uint16_t destination;
+ nd_uint32_t verificationTag;
+ nd_uint32_t adler32;
+};
+
+/* various descriptor parsers */
+
+struct sctpChunkDesc{
+ nd_uint8_t chunkID;
+ nd_uint8_t chunkFlg;
+ nd_uint16_t chunkLength;
+};
+
+struct sctpParamDesc{
+ nd_uint16_t paramType;
+ nd_uint16_t paramLength;
+};
+
+
+struct sctpRelChunkDesc{
+ struct sctpChunkDesc chk;
+ nd_uint32_t serialNumber;
+};
+
+struct sctpVendorSpecificParam {
+ struct sctpParamDesc p; /* type must be 0xfffe */
+ nd_uint32_t vendorId; /* vendor ID from RFC 1700 */
+ nd_uint16_t vendorSpecificType;
+ nd_uint16_t vendorSpecificLen;
+};
+
+
+/* Structures for the control parts */
+
+
+
+/* Sctp association init request/ack */
+
+/* this is used for init ack, too */
+struct sctpInitiation{
+ 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 */
+ nd_ipv4 ipAddress;
+};
+
+
+struct sctpV6IpAddress{
+ struct sctpParamDesc p; /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
+ nd_ipv6 ipAddress;
+};
+
+struct sctpDNSName{
+ struct sctpParamDesc param;
+ nd_byte name[1];
+};
+
+
+struct sctpCookiePreserve{
+ struct sctpParamDesc p; /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
+ nd_uint32_t extraTime;
+};
+
+
+struct sctpTimeStamp{
+ nd_uint32_t ts_sec;
+ nd_uint32_t ts_usec;
+};
+
+
+/* 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 amount of trailing int's
+ * on the last part (based on the numberOfDesc
+ * field).
+ */
+
+struct sctpSelectiveAck{
+ nd_uint32_t highestConseqTSN;
+ nd_uint32_t updatedRwnd;
+ nd_uint16_t numberOfdesc;
+ nd_uint16_t numDupTsns;
+};
+
+struct sctpSelectiveFrag{
+ nd_uint16_t fragmentStart;
+ nd_uint16_t fragmentEnd;
+};
+
+
+struct sctpUnifiedSack{
+ struct sctpChunkDesc uh;
+ struct sctpSelectiveAck sack;
+};
+
+/* 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;
+ 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 {
+ nd_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{
+ nd_uint16_t cause;
+ nd_uint16_t causeLen;
+};
+
+struct sctpUnifiedOpError{
+ struct sctpChunkDesc uh;
+ struct sctpOpErrorCause c;
+};
+
+struct sctpUnifiedStreamError{
+ struct sctpHeader mh;
+ struct sctpChunkDesc uh;
+ struct sctpOpErrorCause c;
+ nd_uint16_t strmNum;
+ nd_uint16_t reserved;
+};
+
+struct staleCookieMsg{
+ struct sctpHeader mh;
+ struct sctpChunkDesc uh;
+ struct sctpOpErrorCause c;
+ nd_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{
+ nd_uint32_t TSN;
+ nd_uint16_t streamId;
+ nd_uint16_t sequence;
+ nd_uint32_t payloadtype;
+};
+
+struct sctpUnifiedDatagram{
+ struct sctpChunkDesc uh;
+ struct sctpDataPart dp;
+};
+
+struct sctpECN_echo{
+ struct sctpChunkDesc uh;
+ nd_uint32_t Lowest_TSN;
+};
+
+
+struct sctpCWR{
+ struct sctpChunkDesc uh;
+ nd_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 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;
+ const struct ip6_hdr *ip6;
+ uint8_t chunkID;
+ u_short sourcePort, destPort;
+ u_int chunkCount;
+ const struct sctpChunkDesc *chunkDescPtr;
+ const char *sep;
+ int isforces = 0;
+
+ ndo->ndo_protocol = "sctp";
+ if (sctpPacketLength < sizeof(struct sctpHeader))
+ {
+ ND_PRINT("truncated-sctp - %zu bytes missing!",
+ sizeof(struct sctpHeader) - sctpPacketLength);
+ return;
+ }
+ sctpPktHdr = (const struct sctpHeader*) bp;
+ ND_TCHECK_SIZE(sctpPktHdr);
+ sctpPacketLengthRemaining = sctpPacketLength;
+
+ sourcePort = GET_BE_U_2(sctpPktHdr->source);
+ destPort = GET_BE_U_2(sctpPktHdr->destination);
+
+ ip = (const struct ip *)bp2;
+ if (IP_V(ip) == 6)
+ ip6 = (const struct ip6_hdr *)bp2;
+ else
+ ip6 = NULL;
+
+ if (ip6) {
+ ND_PRINT("%s.%u > %s.%u: sctp",
+ GET_IP6ADDR_STRING(ip6->ip6_src),
+ sourcePort,
+ GET_IP6ADDR_STRING(ip6->ip6_dst),
+ destPort);
+ } else {
+ ND_PRINT("%s.%u > %s.%u: sctp",
+ GET_IPADDR_STRING(ip->ip_src),
+ sourcePort,
+ GET_IPADDR_STRING(ip->ip_dst),
+ destPort);
+ }
+
+ if (isForCES_port(sourcePort)) {
+ ND_PRINT("[%s]", tok2str(ForCES_channels, NULL, sourcePort));
+ isforces = 1;
+ }
+ if (isForCES_port(destPort)) {
+ 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 *)bp;
+ sctpPacketLengthRemaining != 0;
+ chunkCount++)
+ {
+ uint16_t chunkLength, chunkLengthRemaining;
+ uint16_t align;
+
+ 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("%s%u) [Bad chunk length %u, < size of chunk descriptor]", sep, chunkCount+1, chunkLength);
+ break;
+ }
+ chunkLengthRemaining = chunkLength;
+
+ align = chunkLength % 4;
+ if (align != 0)
+ align = 4 - 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("%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;
+ 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) ||
+ (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("bogus chunk length %u]", chunkLength);
+ return;
+ }
+
+ if (isforces) {
+ 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, bp, payload_size);
+ /* ndo_protocol reassignment after m3ua_print() call */
+ ndo->ndo_protocol = "sctp";
+ break;
+ default:
+ ND_PRINT("[Payload");
+ if (!ndo->ndo_suppress_default_print) {
+ ND_PRINT(":");
+ ND_DEFAULTPRINT(bp, payload_size);
+ }
+ ND_PRINT("]");
+ break;
+ }
+ }
+ bp += payload_size;
+ sctpPacketLengthRemaining -= payload_size;
+ chunkLengthRemaining -= payload_size;
+ break;
+ }
+ case SCTP_INITIATION :
+ {
+ const struct sctpInitiation *init;
+
+ 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;
+
+ 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;
+ u_int fragNo, tsnNo;
+ const u_char *dupTSN;
+
+ 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 (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,
+ 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 (tsnNo=0;
+ chunkLengthRemaining != 0 && tsnNo<GET_BE_U_2(sack->numDupTsns);
+ 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;
+ }
+ }
+
+ /*
+ * 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_trunc(ndo);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-09 16:14:13 +0000