print-sctp.c revision e66460324c0c1d5b6f767afeb6f3d201094156d3 
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#ifndef lint
37static const char rcsid[] _U_ =
38"@(#) $Header: /tcpdump/master/tcpdump/print-sctp.c,v 1.16.2.5 2007/09/13 18:04:58 guy Exp $ (NETLAB/PEL)";
39#endif
40
41#ifdef HAVE_CONFIG_H
42#include "config.h"
43#endif
44
45#include <tcpdump-stdinc.h>
46
47#include "sctpHeader.h"
48#include "sctpConstants.h"
49#include <assert.h>
50
51#include <stdio.h>
52#include <string.h>
53
54#include "interface.h"
55#include "addrtoname.h"
56#include "extract.h"			/* must come after interface.h */
57#include "ip.h"
58#ifdef INET6
59#include "ip6.h"
60#endif
61
62void sctp_print(const u_char *bp,        /* beginning of sctp packet */
63		const u_char *bp2,       /* beginning of enclosing */
64		u_int sctpPacketLength)  /* ip packet */
65{
66  const struct sctpHeader *sctpPktHdr;
67  const struct ip *ip;
68#ifdef INET6
69  const struct ip6_hdr *ip6;
70#endif
71  const void *endPacketPtr;
72  u_short sourcePort, destPort;
73  int chunkCount;
74  const struct sctpChunkDesc *chunkDescPtr;
75  const void *nextChunk;
76  const char *sep;
77
78  sctpPktHdr = (const struct sctpHeader*) bp;
79  endPacketPtr = (const u_char*)sctpPktHdr+sctpPacketLength;
80
81  if( (u_long) endPacketPtr > (u_long) snapend)
82    endPacketPtr = (const void *) snapend;
83  ip = (struct ip *)bp2;
84#ifdef INET6
85  if (IP_V(ip) == 6)
86    ip6 = (const struct ip6_hdr *)bp2;
87  else
88    ip6 = NULL;
89#endif /*INET6*/
90  TCHECK(*sctpPktHdr);
91
92  if (sctpPacketLength < sizeof(struct sctpHeader))
93    {
94      (void)printf("truncated-sctp - %ld bytes missing!",
95		   (long)sctpPacketLength-sizeof(struct sctpHeader));
96      return;
97    }
98
99  /*    sctpPacketLength -= sizeof(struct sctpHeader);  packet length  */
100  /*  			      is now only as long as the payload  */
101
102  sourcePort = EXTRACT_16BITS(&sctpPktHdr->source);
103  destPort = EXTRACT_16BITS(&sctpPktHdr->destination);
104
105#ifdef INET6
106  if (ip6) {
107    (void)printf("%s.%d > %s.%d: sctp",
108      ip6addr_string(&ip6->ip6_src),
109      sourcePort,
110      ip6addr_string(&ip6->ip6_dst),
111      destPort);
112  } else
113#endif /*INET6*/
114  {
115    (void)printf("%s.%d > %s.%d: sctp",
116      ipaddr_string(&ip->ip_src),
117      sourcePort,
118      ipaddr_string(&ip->ip_dst),
119      destPort);
120  }
121  fflush(stdout);
122
123  if (vflag >= 2)
124    sep = "\n\t";
125  else
126    sep = " (";
127  /* cycle through all chunks, printing information on each one */
128  for (chunkCount = 0,
129	 chunkDescPtr = (const struct sctpChunkDesc *)
130	    ((const u_char*) sctpPktHdr + sizeof(struct sctpHeader));
131       chunkDescPtr != NULL &&
132	 ( (const void *)
133	    ((const u_char *) chunkDescPtr + sizeof(struct sctpChunkDesc))
134	   <= endPacketPtr);
135
136       chunkDescPtr = (const struct sctpChunkDesc *) nextChunk, chunkCount++)
137    {
138      u_int16_t chunkLength;
139      const u_char *chunkEnd;
140      u_int16_t align;
141
142      TCHECK(*chunkDescPtr);
143      chunkLength = EXTRACT_16BITS(&chunkDescPtr->chunkLength);
144      if (chunkLength < sizeof(*chunkDescPtr)) {
145      	printf("%s%d) [Bad chunk length %u]", sep, chunkCount+1, chunkLength);
146      	break;
147      }
148
149      TCHECK2(*((u_int8_t *)chunkDescPtr), chunkLength);
150      chunkEnd = ((const u_char*)chunkDescPtr + chunkLength);
151
152      align=chunkLength % 4;
153      if (align != 0)
154	align = 4 - align;
155
156      nextChunk = (const void *) (chunkEnd + align);
157
158      printf("%s%d) ", sep, chunkCount+1);
159      switch (chunkDescPtr->chunkID)
160	{
161	case SCTP_DATA :
162	  {
163	    const struct sctpDataPart *dataHdrPtr;
164
165	    printf("[DATA] ");
166
167	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
168		== SCTP_DATA_UNORDERED)
169	      printf("(U)");
170
171	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
172		== SCTP_DATA_FIRST_FRAG)
173	      printf("(B)");
174
175	    if ((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
176		== SCTP_DATA_LAST_FRAG)
177	      printf("(E)");
178
179	    if( ((chunkDescPtr->chunkFlg & SCTP_DATA_UNORDERED)
180		 == SCTP_DATA_UNORDERED)
181		||
182		((chunkDescPtr->chunkFlg & SCTP_DATA_FIRST_FRAG)
183		 == SCTP_DATA_FIRST_FRAG)
184		||
185		((chunkDescPtr->chunkFlg & SCTP_DATA_LAST_FRAG)
186		 == SCTP_DATA_LAST_FRAG) )
187	      printf(" ");
188
189	    dataHdrPtr=(const struct sctpDataPart*)(chunkDescPtr+1);
190
191	    printf("[TSN: %u] ", EXTRACT_32BITS(&dataHdrPtr->TSN));
192	    printf("[SID: %u] ", EXTRACT_16BITS(&dataHdrPtr->streamId));
193	    printf("[SSEQ %u] ", EXTRACT_16BITS(&dataHdrPtr->sequence));
194	    printf("[PPID 0x%x] ", EXTRACT_32BITS(&dataHdrPtr->payloadtype));
195	    fflush(stdout);
196
197	    if (vflag >= 2)	   /* if verbose output is specified */
198	      {		           /* at the command line */
199		const u_char *payloadPtr;
200
201		printf("[Payload");
202
203		if (!suppress_default_print) {
204			payloadPtr = (const u_char *) (++dataHdrPtr);
205			printf(":");
206			if (htons(chunkDescPtr->chunkLength) <
207			    sizeof(struct sctpDataPart)+
208			    sizeof(struct sctpChunkDesc)+1) {
209				/* Less than 1 byte of chunk payload */
210				printf("bogus chunk length %u]",
211				    htons(chunkDescPtr->chunkLength));
212				return;
213			}
214			default_print(payloadPtr,
215			      htons(chunkDescPtr->chunkLength) -
216			      (sizeof(struct sctpDataPart)+
217			      sizeof(struct sctpChunkDesc)));
218		} else
219			printf("]");
220	      }
221	    break;
222	  }
223	case SCTP_INITIATION :
224	  {
225	    const struct sctpInitiation *init;
226
227	    printf("[INIT] ");
228	    init=(const struct sctpInitiation*)(chunkDescPtr+1);
229	    printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
230	    printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
231	    printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
232	    printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
233	    printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
234
235#if(0) /* ALC you can add code for optional params here */
236	    if( (init+1) < chunkEnd )
237	      printf(" @@@@@ UNFINISHED @@@@@@%s\n",
238		     "Optional params present, but not printed.");
239#endif
240	    break;
241	  }
242	case SCTP_INITIATION_ACK :
243	  {
244	    const struct sctpInitiation *init;
245
246	    printf("[INIT ACK] ");
247	    init=(const struct sctpInitiation*)(chunkDescPtr+1);
248	    printf("[init tag: %u] ", EXTRACT_32BITS(&init->initTag));
249	    printf("[rwnd: %u] ", EXTRACT_32BITS(&init->rcvWindowCredit));
250	    printf("[OS: %u] ", EXTRACT_16BITS(&init->NumPreopenStreams));
251	    printf("[MIS: %u] ", EXTRACT_16BITS(&init->MaxInboundStreams));
252	    printf("[init TSN: %u] ", EXTRACT_32BITS(&init->initialTSN));
253
254#if(0) /* ALC you can add code for optional params here */
255	    if( (init+1) < chunkEnd )
256	      printf(" @@@@@ UNFINISHED @@@@@@%s\n",
257		     "Optional params present, but not printed.");
258#endif
259	    break;
260	  }
261	case SCTP_SELECTIVE_ACK:
262	  {
263	    const struct sctpSelectiveAck *sack;
264	    const struct sctpSelectiveFrag *frag;
265	    int fragNo, tsnNo;
266	    const u_char *dupTSN;
267
268	    printf("[SACK] ");
269	    sack=(const struct sctpSelectiveAck*)(chunkDescPtr+1);
270	    printf("[cum ack %u] ", EXTRACT_32BITS(&sack->highestConseqTSN));
271	    printf("[a_rwnd %u] ", EXTRACT_32BITS(&sack->updatedRwnd));
272	    printf("[#gap acks %u] ", EXTRACT_16BITS(&sack->numberOfdesc));
273	    printf("[#dup tsns %u] ", EXTRACT_16BITS(&sack->numDupTsns));
274
275
276	    /* print gaps */
277	    for (frag = ( (const struct sctpSelectiveFrag *)
278			  ((const struct sctpSelectiveAck *) sack+1)),
279		   fragNo=0;
280		 (const void *)frag < nextChunk && fragNo < EXTRACT_16BITS(&sack->numberOfdesc);
281		 frag++, fragNo++)
282	      printf("\n\t\t[gap ack block #%d: start = %u, end = %u] ",
283		     fragNo+1,
284		     EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentStart),
285		     EXTRACT_32BITS(&sack->highestConseqTSN) + EXTRACT_16BITS(&frag->fragmentEnd));
286
287
288	    /* print duplicate TSNs */
289	    for (dupTSN = (const u_char *)frag, tsnNo=0;
290		 (const void *) dupTSN < nextChunk && tsnNo<EXTRACT_16BITS(&sack->numDupTsns);
291		 dupTSN += 4, tsnNo++)
292	      printf("\n\t\t[dup TSN #%u: %u] ", tsnNo+1,
293	          EXTRACT_32BITS(dupTSN));
294
295	    break;
296	  }
297	case SCTP_HEARTBEAT_REQUEST :
298	  {
299	    const struct sctpHBsender *hb;
300
301	    hb=(const struct sctpHBsender*)chunkDescPtr;
302
303	    printf("[HB REQ] ");
304
305	    break;
306	  }
307	case SCTP_HEARTBEAT_ACK :
308	  printf("[HB ACK] ");
309	  break;
310	case SCTP_ABORT_ASSOCIATION :
311	  printf("[ABORT] ");
312	  break;
313	case SCTP_SHUTDOWN :
314	  printf("[SHUTDOWN] ");
315	  break;
316	case SCTP_SHUTDOWN_ACK :
317	  printf("[SHUTDOWN ACK] ");
318	  break;
319	case SCTP_OPERATION_ERR :
320	  printf("[OP ERR] ");
321	  break;
322	case SCTP_COOKIE_ECHO :
323	  printf("[COOKIE ECHO] ");
324	  break;
325	case SCTP_COOKIE_ACK :
326	  printf("[COOKIE ACK] ");
327	  break;
328	case SCTP_ECN_ECHO :
329	  printf("[ECN ECHO] ");
330	  break;
331	case SCTP_ECN_CWR :
332	  printf("[ECN CWR] ");
333	  break;
334	case SCTP_SHUTDOWN_COMPLETE :
335	  printf("[SHUTDOWN COMPLETE] ");
336	  break;
337	case SCTP_FORWARD_CUM_TSN :
338	  printf("[FOR CUM TSN] ");
339	  break;
340	case SCTP_RELIABLE_CNTL :
341	  printf("[REL CTRL] ");
342	  break;
343	case SCTP_RELIABLE_CNTL_ACK :
344	  printf("[REL CTRL ACK] ");
345	  break;
346	default :
347	  printf("[Unknown chunk type: 0x%x]", chunkDescPtr->chunkID);
348	  return;
349	}
350
351	if (vflag < 2)
352	  sep = ", (";
353    }
354    return;
355
356trunc:
357    printf("[|sctp]");
358    return;
359}
360