1 /* Copyright (c) 2001 NETLAB, Temple University
2 * Copyright (c) 2001 Protocol Engineering Lab, University of Delaware
3 *
4 * Jerry Heinz <gheinz@astro.temple.edu>
5 * John Fiore <jfiore@joda.cis.temple.edu>
6 * Armando L. Caro Jr. <acaro@cis.udel.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the University nor of the Laboratory may be used
20 * to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #define NETDISSECT_REWORKED
37 #ifdef HAVE_CONFIG_H
38 #include "config.h"
39 #endif
40
41 #include <tcpdump-stdinc.h>
42
43 #include "interface.h"
44 #include "addrtoname.h"
45 #include "extract.h" /* must come after interface.h */
46 #include "ip.h"
47 #ifdef INET6
48 #include "ip6.h"
49 #endif
50
51 /* Definitions from:
52 *
53 * SCTP reference Implementation Copyright (C) 1999 Cisco And Motorola
54 *
55 * Redistribution and use in source and binary forms, with or without
56 * modification, are permitted provided that the following conditions
57 * are met:
58 *
59 * 1. Redistributions of source code must retain the above copyright
60 * notice, this list of conditions and the following disclaimer.
61 *
62 * 2. Redistributions in binary form must reproduce the above copyright
63 * notice, this list of conditions and the following disclaimer in the
64 * documentation and/or other materials provided with the distribution.
65 *
66 * 3. Neither the name of Cisco nor of Motorola may be used
67 * to endorse or promote products derived from this software without
68 * specific prior written permission.
69 *
70 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
71 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
72 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
73 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
74 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
75 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
76 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
77 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
78 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
79 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
80 * SUCH DAMAGE.
81 *
82 * This file is part of the SCTP reference Implementation
83 *
84 *
85 * Please send any bug reports or fixes you make to one of the following email
86 * addresses:
87 *
88 * rstewar1@email.mot.com
89 * kmorneau@cisco.com
90 * qxie1@email.mot.com
91 *
92 * Any bugs reported given to us we will try to fix... any fixes shared will
93 * be incorperated into the next SCTP release.
94 */
95
96 /* The valid defines for all message
97 * types know to SCTP. 0 is reserved
98 */
99 #define SCTP_DATA 0x00
100 #define SCTP_INITIATION 0x01
101 #define SCTP_INITIATION_ACK 0x02
102 #define SCTP_SELECTIVE_ACK 0x03
103 #define SCTP_HEARTBEAT_REQUEST 0x04
104 #define SCTP_HEARTBEAT_ACK 0x05
105 #define SCTP_ABORT_ASSOCIATION 0x06
106 #define SCTP_SHUTDOWN 0x07
107 #define SCTP_SHUTDOWN_ACK 0x08
108 #define SCTP_OPERATION_ERR 0x09
109 #define SCTP_COOKIE_ECHO 0x0a
110 #define SCTP_COOKIE_ACK 0x0b
111 #define SCTP_ECN_ECHO 0x0c
112 #define SCTP_ECN_CWR 0x0d
113 #define SCTP_SHUTDOWN_COMPLETE 0x0e
114 #define SCTP_FORWARD_CUM_TSN 0xc0
115 #define SCTP_RELIABLE_CNTL 0xc1
116 #define SCTP_RELIABLE_CNTL_ACK 0xc2
117
118 static const struct tok sctp_chunkid_str[] = {
119 { SCTP_DATA, "DATA" },
120 { SCTP_INITIATION, "INIT" },
121 { SCTP_INITIATION_ACK, "INIT ACK" },
122 { SCTP_SELECTIVE_ACK, "SACK" },
123 { SCTP_HEARTBEAT_REQUEST, "HB REQ" },
124 { SCTP_HEARTBEAT_ACK, "HB ACK" },
125 { SCTP_ABORT_ASSOCIATION, "ABORT" },
126 { SCTP_SHUTDOWN, "SHUTDOWN" },
127 { SCTP_SHUTDOWN_ACK, "SHUTDOWN ACK" },
128 { SCTP_OPERATION_ERR, "OP ERR" },
129 { SCTP_COOKIE_ECHO, "COOKIE ECHO" },
130 { SCTP_COOKIE_ACK, "COOKIE ACK" },
131 { SCTP_ECN_ECHO, "ECN ECHO" },
132 { SCTP_ECN_CWR, "ECN CWR" },
133 { SCTP_SHUTDOWN_COMPLETE, "SHUTDOWN COMPLETE" },
134 { SCTP_FORWARD_CUM_TSN, "FOR CUM TSN" },
135 { SCTP_RELIABLE_CNTL, "REL CTRL" },
136 { SCTP_RELIABLE_CNTL_ACK, "REL CTRL ACK" },
137 { 0, NULL }
138 };
139
140 /* Data Chuck Specific Flags */
141 #define SCTP_DATA_FRAG_MASK 0x03
142 #define SCTP_DATA_MIDDLE_FRAG 0x00
143 #define SCTP_DATA_LAST_FRAG 0x01
144 #define SCTP_DATA_FIRST_FRAG 0x02
145 #define SCTP_DATA_NOT_FRAG 0x03
146 #define SCTP_DATA_UNORDERED 0x04
147
148 #define SCTP_ADDRMAX 60
149
150 #define CHAN_HP 6704
151 #define CHAN_MP 6705
152 #define CHAN_LP 6706
153
154 /* the sctp common header */
155
156 struct sctpHeader{
157 uint16_t source;
158 uint16_t destination;
159 uint32_t verificationTag;
160 uint32_t adler32;
161 };
162
163 /* various descriptor parsers */
164
165 struct sctpChunkDesc{
166 uint8_t chunkID;
167 uint8_t chunkFlg;
168 uint16_t chunkLength;
169 };
170
171 struct sctpParamDesc{
172 uint16_t paramType;
173 uint16_t paramLength;
174 };
175
176
177 struct sctpRelChunkDesc{
178 struct sctpChunkDesc chk;
179 uint32_t serialNumber;
180 };
181
182 struct sctpVendorSpecificParam {
183 struct sctpParamDesc p; /* type must be 0xfffe */
184 uint32_t vendorId; /* vendor ID from RFC 1700 */
185 uint16_t vendorSpecificType;
186 uint16_t vendorSpecificLen;
187 };
188
189
190 /* Structures for the control parts */
191
192
193
194 /* Sctp association init request/ack */
195
196 /* this is used for init ack, too */
197 struct sctpInitiation{
198 uint32_t initTag; /* tag of mine */
199 uint32_t rcvWindowCredit; /* rwnd */
200 uint16_t NumPreopenStreams; /* OS */
201 uint16_t MaxInboundStreams; /* MIS */
202 uint32_t initialTSN;
203 /* optional param's follow in sctpParamDesc form */
204 };
205
206 struct sctpV4IpAddress{
207 struct sctpParamDesc p; /* type is set to SCTP_IPV4_PARAM_TYPE, len=10 */
208 uint32_t ipAddress;
209 };
210
211
212 struct sctpV6IpAddress{
213 struct sctpParamDesc p; /* type is set to SCTP_IPV6_PARAM_TYPE, len=22 */
214 uint8_t ipAddress[16];
215 };
216
217 struct sctpDNSName{
218 struct sctpParamDesc param;
219 uint8_t name[1];
220 };
221
222
223 struct sctpCookiePreserve{
224 struct sctpParamDesc p; /* type is set to SCTP_COOKIE_PRESERVE, len=8 */
225 uint32_t extraTime;
226 };
227
228
229 struct sctpTimeStamp{
230 uint32_t ts_sec;
231 uint32_t ts_usec;
232 };
233
234 /* wire structure of my cookie */
235 struct cookieMessage{
236 uint32_t TieTag_curTag; /* copied from assoc if present */
237 uint32_t TieTag_hisTag; /* copied from assoc if present */
238 int32_t cookieLife; /* life I will award this cookie */
239 struct sctpTimeStamp timeEnteringState; /* the time I built cookie */
240 struct sctpInitiation initAckISent; /* the INIT-ACK that I sent to my peer */
241 uint32_t addressWhereISent[4]; /* I make this 4 ints so I get 128bits for future */
242 int32_t addrtype; /* address type */
243 uint16_t locScope; /* V6 local scope flag */
244 uint16_t siteScope; /* V6 site scope flag */
245 /* at the end is tacked on the INIT chunk sent in
246 * its entirety and of course our
247 * signature.
248 */
249 };
250
251
252 /* this guy is for use when
253 * I have a initiate message gloming the
254 * things together.
255
256 */
257 struct sctpUnifiedInit{
258 struct sctpChunkDesc uh;
259 struct sctpInitiation initm;
260 };
261
262 struct sctpSendableInit{
263 struct sctpHeader mh;
264 struct sctpUnifiedInit msg;
265 };
266
267
268 /* Selective Acknowledgement
269 * has the following structure with
270 * a optional ammount of trailing int's
271 * on the last part (based on the numberOfDesc
272 * field).
273 */
274
275 struct sctpSelectiveAck{
276 uint32_t highestConseqTSN;
277 uint32_t updatedRwnd;
278 uint16_t numberOfdesc;
279 uint16_t numDupTsns;
280 };
281
282 struct sctpSelectiveFrag{
283 uint16_t fragmentStart;
284 uint16_t fragmentEnd;
285 };
286
287
288 struct sctpUnifiedSack{
289 struct sctpChunkDesc uh;
290 struct sctpSelectiveAck sack;
291 };
292
293 /* for both RTT request/response the
294 * following is sent
295 */
296
297 struct sctpHBrequest {
298 uint32_t time_value_1;
299 uint32_t time_value_2;
300 };
301
302 /* here is what I read and respond with to. */
303 struct sctpHBunified{
304 struct sctpChunkDesc hdr;
305 struct sctpParamDesc hb;
306 };
307
308
309 /* here is what I send */
310 struct sctpHBsender{
311 struct sctpChunkDesc hdr;
312 struct sctpParamDesc hb;
313 struct sctpHBrequest rtt;
314 int8_t addrFmt[SCTP_ADDRMAX];
315 uint16_t userreq;
316 };
317
318
319
320 /* for the abort and shutdown ACK
321 * we must carry the init tag in the common header. Just the
322 * common header is all that is needed with a chunk descriptor.
323 */
324 struct sctpUnifiedAbort{
325 struct sctpChunkDesc uh;
326 };
327
328 struct sctpUnifiedAbortLight{
329 struct sctpHeader mh;
330 struct sctpChunkDesc uh;
331 };
332
333 struct sctpUnifiedAbortHeavy{
334 struct sctpHeader mh;
335 struct sctpChunkDesc uh;
336 uint16_t causeCode;
337 uint16_t causeLen;
338 };
339
340 /* For the graceful shutdown we must carry
341 * the tag (in common header) and the highest consequitive acking value
342 */
343 struct sctpShutdown {
344 uint32_t TSN_Seen;
345 };
346
347 struct sctpUnifiedShutdown{
348 struct sctpChunkDesc uh;
349 struct sctpShutdown shut;
350 };
351
352 /* in the unified message we add the trailing
353 * stream id since it is the only message
354 * that is defined as a operation error.
355 */
356 struct sctpOpErrorCause{
357 uint16_t cause;
358 uint16_t causeLen;
359 };
360
361 struct sctpUnifiedOpError{
362 struct sctpChunkDesc uh;
363 struct sctpOpErrorCause c;
364 };
365
366 struct sctpUnifiedStreamError{
367 struct sctpHeader mh;
368 struct sctpChunkDesc uh;
369 struct sctpOpErrorCause c;
370 uint16_t strmNum;
371 uint16_t reserved;
372 };
373
374 struct staleCookieMsg{
375 struct sctpHeader mh;
376 struct sctpChunkDesc uh;
377 struct sctpOpErrorCause c;
378 uint32_t moretime;
379 };
380
381 /* the following is used in all sends
382 * where nothing is needed except the
383 * chunk/type i.e. shutdownAck Abort */
384
385 struct sctpUnifiedSingleMsg{
386 struct sctpHeader mh;
387 struct sctpChunkDesc uh;
388 };
389
390 struct sctpDataPart{
391 uint32_t TSN;
392 uint16_t streamId;
393 uint16_t sequence;
394 uint32_t payloadtype;
395 };
396
397 struct sctpUnifiedDatagram{
398 struct sctpChunkDesc uh;
399 struct sctpDataPart dp;
400 };
401
402 struct sctpECN_echo{
403 struct sctpChunkDesc uh;
404 uint32_t Lowest_TSN;
405 };
406
407
408 struct sctpCWR{
409 struct sctpChunkDesc uh;
410 uint32_t TSN_reduced_at;
411 };
412
413 static const struct tok ForCES_channels[] = {
414 { CHAN_HP, "ForCES HP" },
415 { CHAN_MP, "ForCES MP" },
416 { CHAN_LP, "ForCES LP" },
417 { 0, NULL }
418 };
419
420 /* data chunk's payload protocol identifiers */
421
422 #define SCTP_PPID_IUA 1
423 #define SCTP_PPID_M2UA 2
424 #define SCTP_PPID_M3UA 3
425 #define SCTP_PPID_SUA 4
426 #define SCTP_PPID_M2PA 5
427 #define SCTP_PPID_V5UA 6
428 #define SCTP_PPID_H248 7
429 #define SCTP_PPID_BICC 8
430 #define SCTP_PPID_TALI 9
431 #define SCTP_PPID_DUA 10
432 #define SCTP_PPID_ASAP 11
433 #define SCTP_PPID_ENRP 12
434 #define SCTP_PPID_H323 13
435 #define SCTP_PPID_QIPC 14
436 #define SCTP_PPID_SIMCO 15
437 #define SCTP_PPID_DDPSC 16
438 #define SCTP_PPID_DDPSSC 17
439 #define SCTP_PPID_S1AP 18
440 #define SCTP_PPID_RUA 19
441 #define SCTP_PPID_HNBAP 20
442 #define SCTP_PPID_FORCES_HP 21
443 #define SCTP_PPID_FORCES_MP 22
444 #define SCTP_PPID_FORCES_LP 23
445 #define SCTP_PPID_SBC_AP 24
446 #define SCTP_PPID_NBAP 25
447 /* 26 */
448 #define SCTP_PPID_X2AP 27
449
450 static const struct tok PayloadProto_idents[] = {
451 { SCTP_PPID_IUA, "ISDN Q.921" },
452 { SCTP_PPID_M2UA, "M2UA" },
453 { SCTP_PPID_M3UA, "M3UA" },
454 { SCTP_PPID_SUA, "SUA" },
455 { SCTP_PPID_M2PA, "M2PA" },
456 { SCTP_PPID_V5UA, "V5.2" },
457 { SCTP_PPID_H248, "H.248" },
458 { SCTP_PPID_BICC, "BICC" },
459 { SCTP_PPID_TALI, "TALI" },
460 { SCTP_PPID_DUA, "DUA" },
461 { SCTP_PPID_ASAP, "ASAP" },
462 { SCTP_PPID_ENRP, "ENRP" },
463 { SCTP_PPID_H323, "H.323" },
464 { SCTP_PPID_QIPC, "Q.IPC" },
465 { SCTP_PPID_SIMCO, "SIMCO" },
466 { SCTP_PPID_DDPSC, "DDPSC" },
467 { SCTP_PPID_DDPSSC, "DDPSSC" },
468 { SCTP_PPID_S1AP, "S1AP" },
469 { SCTP_PPID_RUA, "RUA" },
470 { SCTP_PPID_HNBAP, "HNBAP" },
471 { SCTP_PPID_FORCES_HP, "ForCES HP" },
472 { SCTP_PPID_FORCES_MP, "ForCES MP" },
473 { SCTP_PPID_FORCES_LP, "ForCES LP" },
474 { SCTP_PPID_SBC_AP, "SBc-AP" },
475 { SCTP_PPID_NBAP, "NBAP" },
476 /* 26 */
477 { SCTP_PPID_X2AP, "X2AP" },
478 { 0, NULL }
479 };
480
481
isForCES_port(u_short Port)482 static inline int isForCES_port(u_short Port)
483 {
484 if (Port == CHAN_HP)
485 return 1;
486 if (Port == CHAN_MP)
487 return 1;
488 if (Port == CHAN_LP)
489 return 1;
490
491 return 0;
492 }
493
sctp_print(netdissect_options * ndo,const u_char * bp,const u_char * bp2,u_int sctpPacketLength)494 void sctp_print(netdissect_options *ndo,
495 const u_char *bp, /* beginning of sctp packet */
496 const u_char *bp2, /* beginning of enclosing */
497 u_int sctpPacketLength) /* ip packet */
498 {
499 const struct sctpHeader *sctpPktHdr;
500 const struct ip *ip;
501 #ifdef INET6
502 const struct ip6_hdr *ip6;
503 #endif
504 const void *endPacketPtr;
505 u_short sourcePort, destPort;
506 int chunkCount;
507 const struct sctpChunkDesc *chunkDescPtr;
508 const void *nextChunk;
509 const char *sep;
510 int isforces = 0;
511
512
513 sctpPktHdr = (const struct sctpHeader*) bp;
514 endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
515
516 if( (u_long) endPacketPtr > (u_long) ndo->ndo_snapend)
517 endPacketPtr = (const void *) ndo->ndo_snapend;
518 ip = (struct ip *)bp2;
519 #ifdef INET6
520 if (IP_V(ip) == 6)
521 ip6 = (const struct ip6_hdr *)bp2;
522 else
523 ip6 = NULL;
524 #endif /*INET6*/
525 ND_TCHECK(*sctpPktHdr);
526
527 if (sctpPacketLength < sizeof(struct sctpHeader))
528 {
529 ND_PRINT((ndo, "truncated-sctp - %ld bytes missing!",
530 (long)sctpPacketLength-sizeof(struct sctpHeader)));
531 return;
532 }
533
534 /* sctpPacketLength -= sizeof(struct sctpHeader); packet length */
535 /* is now only as long as the payload */
536
537 sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
538 destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
539
540 #ifdef INET6
541 if (ip6) {
542 ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
543 ip6addr_string(ndo, &ip6->ip6_src),
544 sourcePort,
545 ip6addr_string(ndo, &ip6->ip6_dst),
546 destPort));
547 } else
548 #endif /*INET6*/
549 {
550 ND_PRINT((ndo, "%s.%d > %s.%d: sctp",
551 ipaddr_string(ndo, &ip->ip_src),
552 sourcePort,
553 ipaddr_string(ndo, &ip->ip_dst),
554 destPort));
555 }
556
557 if (isForCES_port(sourcePort)) {
558 ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, sourcePort)));
559 isforces = 1;
560 }
561 if (isForCES_port(destPort)) {
562 ND_PRINT((ndo, "[%s]", tok2str(ForCES_channels, NULL, destPort)));
563 isforces = 1;
564 }
565
566 if (ndo->ndo_vflag >= 2)
567 sep = "\n\t";
568 else
569 sep = " (";
570 /* cycle through all chunks, printing information on each one */
571 for (chunkCount = 0,
572 chunkDescPtr = (const struct sctpChunkDesc *)
573 ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
574 chunkDescPtr != NULL &&
575 ( (const void *)
576 ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
577 <= endPacketPtr);
578
579 chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
580 {
581 uint16_t chunkLength;
582 const u_char *chunkEnd;
583 uint16_t align;
584
585 ND_TCHECK(*chunkDescPtr);
586 chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
587 if (chunkLength < sizeof(*chunkDescPtr)) {
588 ND_PRINT((ndo, "%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength));
589 break;
590 }
591
592 ND_TCHECK2(*((uint8_t *)chunkDescPtr), chunkLength);
593 chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
594
595 align=chunkLength % 4;
596 if (align != 0)
597 align = 4 - align;
598
599 nextChunk = (const void *) (chunkEnd + align);
600
601 ND_PRINT((ndo, "%s%d) ", sep, chunkCount+1));
602 ND_PRINT((ndo, "[%s] ", tok2str(sctp_chunkid_str, "Unknown chunk type: 0x%x",
603 chunkDescPtr->chunkID)));
604 switch (chunkDescPtr->chunkID)
605 {
606 case SCTP_DATA :
607 {
608 const struct sctpDataPart *dataHdrPtr;
609 uint32_t ppid;
610 const u_char *payloadPtr;
611 u_int payload_size;
612
613 if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
614 == SCTP_DATA_UNORDERED)
615 ND_PRINT((ndo, "(U)"));
616
617 if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
618 == SCTP_DATA_FIRST_FRAG)
619 ND_PRINT((ndo, "(B)"));
620
621 if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
622 == SCTP_DATA_LAST_FRAG)
623 ND_PRINT((ndo, "(E)"));
624
625 if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
626 == SCTP_DATA_UNORDERED)
627 ||
628 ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
629 == SCTP_DATA_FIRST_FRAG)
630 ||
631 ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
632 == SCTP_DATA_LAST_FRAG) )
633 ND_PRINT((ndo, " "));
634
635 dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
636
637 ppid = EXTRACT_32BITS(&dataHdrPtr->payloadtype);
638 ND_PRINT((ndo, "[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN)));
639 ND_PRINT((ndo, "[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId)));
640 ND_PRINT((ndo, "[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence)));
641 ND_PRINT((ndo, "[PPID %s] ",
642 tok2str(PayloadProto_idents, "0x%x", ppid)));
643
644 if (!isforces) {
645 isforces = (ppid == SCTP_PPID_FORCES_HP) ||
646 (ppid == SCTP_PPID_FORCES_MP) ||
647 (ppid == SCTP_PPID_FORCES_LP);
648 }
649
650 payloadPtr = (const u_char *) (dataHdrPtr + 1);
651 if (EXTRACT_16BITS(&chunkDescPtr->chunkLength) <
652 sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc) + 1) {
653 ND_PRINT((ndo, "bogus chunk length %u]", EXTRACT_16BITS(&chunkDescPtr->chunkLength)));
654 return;
655 }
656
657 payload_size = EXTRACT_16BITS(&chunkDescPtr->chunkLength) -
658 (sizeof(struct sctpDataPart) + sizeof(struct sctpChunkDesc));
659
660 if (isforces) {
661 forces_print(ndo, payloadPtr, payload_size);
662 } else if (ndo->ndo_vflag >= 2) { /* if verbose output is specified */
663 /* at the command line */
664 switch (ppid) {
665 case SCTP_PPID_M3UA :
666 m3ua_print(ndo, payloadPtr, payload_size);
667 break;
668 default:
669 ND_PRINT((ndo, "[Payload"));
670 if (!ndo->ndo_suppress_default_print) {
671 ND_PRINT((ndo, ":"));
672 ND_DEFAULTPRINT(payloadPtr, payload_size);
673 }
674 ND_PRINT((ndo, "]"));
675 break;
676 }
677 }
678 break;
679 }
680 case SCTP_INITIATION :
681 {
682 const struct sctpInitiation *init;
683
684 init=(const struct sctpInitiation*)(chunkDescPtr+1);
685 ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
686 ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
687 ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
688 ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
689 ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
690
691 #if(0) /* ALC you can add code for optional params here */
692 if( (init+1) < chunkEnd )
693 ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
694 "Optional params present, but not printed."));
695 #endif
696 break;
697 }
698 case SCTP_INITIATION_ACK :
699 {
700 const struct sctpInitiation *init;
701
702 init=(const struct sctpInitiation*)(chunkDescPtr+1);
703 ND_PRINT((ndo, "[init tag: %u] ", EXTRACT_32BITS(&init->initTag)));
704 ND_PRINT((ndo, "[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit)));
705 ND_PRINT((ndo, "[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams)));
706 ND_PRINT((ndo, "[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams)));
707 ND_PRINT((ndo, "[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN)));
708
709 #if(0) /* ALC you can add code for optional params here */
710 if( (init+1) < chunkEnd )
711 ND_PRINT((ndo, " @@@@@ UNFINISHED @@@@@@%s\n",
712 "Optional params present, but not printed."));
713 #endif
714 break;
715 }
716 case SCTP_SELECTIVE_ACK:
717 {
718 const struct sctpSelectiveAck *sack;
719 const struct sctpSelectiveFrag *frag;
720 int fragNo, tsnNo;
721 const u_char *dupTSN;
722
723 sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
724 ND_PRINT((ndo, "[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN)));
725 ND_PRINT((ndo, "[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd)));
726 ND_PRINT((ndo, "[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc)));
727 ND_PRINT((ndo, "[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns)));
728
729
730 /* print gaps */
731 for (frag = ( (const struct sctpSelectiveFrag *)
732 ((const struct sctpSelectiveAck *) sack+1)),
733 fragNo=0;
734 (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
735 frag++, fragNo++)
736 ND_PRINT((ndo, "\n\t\t[gap ack block #%d: start = %u, end = %u] ",
737 fragNo+1,
738 EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
739 EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd)));
740
741
742 /* print duplicate TSNs */
743 for (dupTSN = (const u_char *)frag, tsnNo=0;
744 (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
745 dupTSN += 4, tsnNo++)
746 ND_PRINT((ndo, "\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
747 EXTRACT_32BITS(dupTSN)));
748
749 break;
750 }
751 }
752
753 if (ndo->ndo_vflag < 2)
754 sep = ", (";
755 }
756 return;
757
758 trunc:
759 ND_PRINT((ndo, "[|sctp]"));
760 }
761