print-igmp.c revision 146774 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
3 *  The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#ifndef lint
23static const char rcsid[] _U_ =
24    "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.15 2004/03/24 00:59:16 guy Exp $ (LBL)";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <tcpdump-stdinc.h>
32
33#include <stdio.h>
34#include <string.h>
35
36#include "interface.h"
37#include "addrtoname.h"
38#include "extract.h"            /* must come after interface.h */
39
40#ifndef IN_CLASSD
41#define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
42#endif
43
44/* (following from ipmulti/mrouted/prune.h) */
45
46/*
47 * The packet format for a traceroute request.
48 */
49struct tr_query {
50    u_int32_t  tr_src;          /* traceroute source */
51    u_int32_t  tr_dst;          /* traceroute destination */
52    u_int32_t  tr_raddr;        /* traceroute response address */
53    u_int32_t  tr_rttlqid;      /* response ttl and qid */
54};
55
56#define TR_GETTTL(x)        (int)(((x) >> 24) & 0xff)
57#define TR_GETQID(x)        ((x) & 0x00ffffff)
58
59/*
60 * Traceroute response format.  A traceroute response has a tr_query at the
61 * beginning, followed by one tr_resp for each hop taken.
62 */
63struct tr_resp {
64    u_int32_t tr_qarr;          /* query arrival time */
65    u_int32_t tr_inaddr;        /* incoming interface address */
66    u_int32_t tr_outaddr;       /* outgoing interface address */
67    u_int32_t tr_rmtaddr;       /* parent address in source tree */
68    u_int32_t tr_vifin;         /* input packet count on interface */
69    u_int32_t tr_vifout;        /* output packet count on interface */
70    u_int32_t tr_pktcnt;        /* total incoming packets for src-grp */
71    u_int8_t  tr_rproto;      /* routing proto deployed on router */
72    u_int8_t  tr_fttl;        /* ttl required to forward on outvif */
73    u_int8_t  tr_smask;       /* subnet mask for src addr */
74    u_int8_t  tr_rflags;      /* forwarding error codes */
75};
76
77/* defs within mtrace */
78#define TR_QUERY 1
79#define TR_RESP 2
80
81/* fields for tr_rflags (forwarding error codes) */
82#define TR_NO_ERR   0
83#define TR_WRONG_IF 1
84#define TR_PRUNED   2
85#define TR_OPRUNED  3
86#define TR_SCOPED   4
87#define TR_NO_RTE   5
88#define TR_NO_FWD   7
89#define TR_NO_SPACE 0x81
90#define TR_OLD_ROUTER   0x82
91
92/* fields for tr_rproto (routing protocol) */
93#define TR_PROTO_DVMRP  1
94#define TR_PROTO_MOSPF  2
95#define TR_PROTO_PIM    3
96#define TR_PROTO_CBT    4
97
98/* igmpv3 report types */
99static struct tok igmpv3report2str[] = {
100	{ 1,	"is_in" },
101	{ 2,	"is_ex" },
102	{ 3,	"to_in" },
103	{ 4,	"to_ex" },
104	{ 5,	"allow" },
105	{ 6,	"block" },
106	{ 0,	NULL }
107};
108
109static void
110print_mtrace(register const u_char *bp, register u_int len)
111{
112    register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
113
114    TCHECK(*tr);
115    if (len < 8 + sizeof (struct tr_query)) {
116	(void)printf(" [invalid len %d]", len);
117	return;
118    }
119    printf("mtrace %u: %s to %s reply-to %s",
120        TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
121        ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
122        ipaddr_string(&tr->tr_raddr));
123    if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
124        printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
125    return;
126trunc:
127    (void)printf("[|igmp]");
128    return;
129}
130
131static void
132print_mresp(register const u_char *bp, register u_int len)
133{
134    register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
135
136    TCHECK(*tr);
137    if (len < 8 + sizeof (struct tr_query)) {
138	(void)printf(" [invalid len %d]", len);
139	return;
140    }
141    printf("mresp %lu: %s to %s reply-to %s",
142        (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
143        ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst),
144        ipaddr_string(&tr->tr_raddr));
145    if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
146        printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)));
147    return;
148trunc:
149    (void)printf("[|igmp]");
150    return;
151}
152
153static void
154print_igmpv3_report(register const u_char *bp, register u_int len)
155{
156    u_int group, nsrcs, ngroups;
157    register u_int i, j;
158
159    /* Minimum len is 16, and should be a multiple of 4 */
160    if (len < 16 || len & 0x03) {
161	(void)printf(" [invalid len %d]", len);
162	return;
163    }
164    TCHECK2(bp[6], 2);
165    ngroups = EXTRACT_16BITS(&bp[6]);
166    (void)printf(", %d group record(s)", ngroups);
167    if (vflag > 0) {
168	/* Print the group records */
169	group = 8;
170        for (i=0; i<ngroups; i++) {
171	    if (len < group+8) {
172		(void)printf(" [invalid number of groups]");
173		return;
174	    }
175	    TCHECK2(bp[group+4], 4);
176            (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4]));
177	    (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
178								bp[group]));
179            nsrcs = EXTRACT_16BITS(&bp[group+2]);
180	    /* Check the number of sources and print them */
181	    if (len < group+8+(nsrcs<<2)) {
182		(void)printf(" [invalid number of sources %d]", nsrcs);
183		return;
184	    }
185            if (vflag == 1)
186                (void)printf(", %d source(s)", nsrcs);
187            else {
188		/* Print the sources */
189                (void)printf(" {");
190                for (j=0; j<nsrcs; j++) {
191		    TCHECK2(bp[group+8+(j<<2)], 4);
192		    (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)]));
193		}
194                (void)printf(" }");
195            }
196	    /* Next group record */
197            group += 8 + (nsrcs << 2);
198	    (void)printf("]");
199        }
200    }
201    return;
202trunc:
203    (void)printf("[|igmp]");
204    return;
205}
206
207static void
208print_igmpv3_query(register const u_char *bp, register u_int len)
209{
210    u_int mrc;
211    int mrt;
212    u_int nsrcs;
213    register u_int i;
214
215    (void)printf(" v3");
216    /* Minimum len is 12, and should be a multiple of 4 */
217    if (len < 12 || len & 0x03) {
218	(void)printf(" [invalid len %d]", len);
219	return;
220    }
221    TCHECK(bp[1]);
222    mrc = bp[1];
223    if (mrc < 128) {
224	mrt = mrc;
225    } else {
226        mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
227    }
228    if (mrc != 100) {
229	(void)printf(" [max resp time ");
230	relts_print(mrt);
231	(void)printf("]");
232    }
233    TCHECK2(bp[4], 4);
234    if (EXTRACT_32BITS(&bp[4]) == 0)
235	return;
236    (void)printf(" [gaddr %s", ipaddr_string(&bp[4]));
237    TCHECK2(bp[10], 2);
238    nsrcs = EXTRACT_16BITS(&bp[10]);
239    if (nsrcs > 0) {
240	if (len < 12 + (nsrcs << 2))
241	    (void)printf(" [invalid number of sources]");
242	else if (vflag > 1) {
243	    (void)printf(" {");
244	    for (i=0; i<nsrcs; i++) {
245		TCHECK2(bp[12+(i<<2)], 4);
246		(void)printf(" %s", ipaddr_string(&bp[12+(i<<2)]));
247	    }
248	    (void)printf(" }");
249	} else
250	    (void)printf(", %d source(s)", nsrcs);
251    }
252    (void)printf("]");
253    return;
254trunc:
255    (void)printf("[|igmp]");
256    return;
257}
258
259void
260igmp_print(register const u_char *bp, register u_int len)
261{
262    if (qflag) {
263        (void)printf("igmp");
264        return;
265    }
266
267    TCHECK(bp[0]);
268    switch (bp[0]) {
269    case 0x11:
270        (void)printf("igmp query");
271	if (len >= 12)
272	    print_igmpv3_query(bp, len);
273	else {
274            TCHECK(bp[1]);
275	    if (bp[1]) {
276		(void)printf(" v2");
277		if (bp[1] != 100)
278		    (void)printf(" [max resp time %d]", bp[1]);
279	    } else
280		(void)printf(" v1");
281            TCHECK2(bp[4], 4);
282	    if (EXTRACT_32BITS(&bp[4]))
283                (void)printf(" [gaddr %s]", ipaddr_string(&bp[4]));
284            if (len != 8)
285                (void)printf(" [len %d]", len);
286	}
287        break;
288    case 0x12:
289        TCHECK2(bp[4], 4);
290        (void)printf("igmp v1 report %s", ipaddr_string(&bp[4]));
291        if (len != 8)
292            (void)printf(" [len %d]", len);
293        break;
294    case 0x16:
295        TCHECK2(bp[4], 4);
296        (void)printf("igmp v2 report %s", ipaddr_string(&bp[4]));
297        break;
298    case 0x22:
299        (void)printf("igmp v3 report");
300	print_igmpv3_report(bp, len);
301        break;
302    case 0x17:
303        TCHECK2(bp[4], 4);
304        (void)printf("igmp leave %s", ipaddr_string(&bp[4]));
305        break;
306    case 0x13:
307        (void)printf("igmp dvmrp");
308        if (len < 8)
309            (void)printf(" [len %d]", len);
310        else
311            dvmrp_print(bp, len);
312        break;
313    case 0x14:
314        (void)printf("igmp pimv1");
315        pimv1_print(bp, len);
316        break;
317    case 0x1e:
318        print_mresp(bp, len);
319        break;
320    case 0x1f:
321        print_mtrace(bp, len);
322        break;
323    default:
324        (void)printf("igmp-%d", bp[0]);
325        break;
326    }
327
328    if (vflag && TTEST2(bp[0], len)) {
329        /* Check the IGMP checksum */
330        if (in_cksum((const u_short*)bp, len, 0))
331            printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]));
332    }
333    return;
334trunc:
335    fputs("[|igmp]", stdout);
336}
337