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1 office 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 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26  
27 #include <tcpdump-stdinc.h>
28  
29 #include "interface.h"
30 #include "addrtoname.h"
31 #include "extract.h" /* must come after interface.h */
32  
33 #ifndef IN_CLASSD
34 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000)
35 #endif
36  
37 static const char tstr[] = "[|igmp]";
38  
39 /* (following from ipmulti/mrouted/prune.h) */
40  
41 /*
42 * The packet format for a traceroute request.
43 */
44 struct tr_query {
45 uint32_t tr_src; /* traceroute source */
46 uint32_t tr_dst; /* traceroute destination */
47 uint32_t tr_raddr; /* traceroute response address */
48 uint32_t tr_rttlqid; /* response ttl and qid */
49 };
50  
51 #define TR_GETTTL(x) (int)(((x) >> 24) & 0xff)
52 #define TR_GETQID(x) ((x) & 0x00ffffff)
53  
54 /*
55 * Traceroute response format. A traceroute response has a tr_query at the
56 * beginning, followed by one tr_resp for each hop taken.
57 */
58 struct tr_resp {
59 uint32_t tr_qarr; /* query arrival time */
60 uint32_t tr_inaddr; /* incoming interface address */
61 uint32_t tr_outaddr; /* outgoing interface address */
62 uint32_t tr_rmtaddr; /* parent address in source tree */
63 uint32_t tr_vifin; /* input packet count on interface */
64 uint32_t tr_vifout; /* output packet count on interface */
65 uint32_t tr_pktcnt; /* total incoming packets for src-grp */
66 uint8_t tr_rproto; /* routing proto deployed on router */
67 uint8_t tr_fttl; /* ttl required to forward on outvif */
68 uint8_t tr_smask; /* subnet mask for src addr */
69 uint8_t tr_rflags; /* forwarding error codes */
70 };
71  
72 /* defs within mtrace */
73 #define TR_QUERY 1
74 #define TR_RESP 2
75  
76 /* fields for tr_rflags (forwarding error codes) */
77 #define TR_NO_ERR 0
78 #define TR_WRONG_IF 1
79 #define TR_PRUNED 2
80 #define TR_OPRUNED 3
81 #define TR_SCOPED 4
82 #define TR_NO_RTE 5
83 #define TR_NO_FWD 7
84 #define TR_NO_SPACE 0x81
85 #define TR_OLD_ROUTER 0x82
86  
87 /* fields for tr_rproto (routing protocol) */
88 #define TR_PROTO_DVMRP 1
89 #define TR_PROTO_MOSPF 2
90 #define TR_PROTO_PIM 3
91 #define TR_PROTO_CBT 4
92  
93 /* igmpv3 report types */
94 static const struct tok igmpv3report2str[] = {
95 { 1, "is_in" },
96 { 2, "is_ex" },
97 { 3, "to_in" },
98 { 4, "to_ex" },
99 { 5, "allow" },
100 { 6, "block" },
101 { 0, NULL }
102 };
103  
104 static void
105 print_mtrace(netdissect_options *ndo,
106 register const u_char *bp, register u_int len)
107 {
108 register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
109  
110 ND_TCHECK(*tr);
111 if (len < 8 + sizeof (struct tr_query)) {
112 ND_PRINT((ndo, " [invalid len %d]", len));
113 return;
114 }
115 ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s",
116 TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
117 ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
118 ipaddr_string(ndo, &tr->tr_raddr)));
119 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
120 ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
121 return;
122 trunc:
123 ND_PRINT((ndo, "%s", tstr));
124 }
125  
126 static void
127 print_mresp(netdissect_options *ndo,
128 register const u_char *bp, register u_int len)
129 {
130 register const struct tr_query *tr = (const struct tr_query *)(bp + 8);
131  
132 ND_TCHECK(*tr);
133 if (len < 8 + sizeof (struct tr_query)) {
134 ND_PRINT((ndo, " [invalid len %d]", len));
135 return;
136 }
137 ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s",
138 (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)),
139 ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst),
140 ipaddr_string(ndo, &tr->tr_raddr)));
141 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr)))
142 ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))));
143 return;
144 trunc:
145 ND_PRINT((ndo, "%s", tstr));
146 }
147  
148 static void
149 print_igmpv3_report(netdissect_options *ndo,
150 register const u_char *bp, register u_int len)
151 {
152 u_int group, nsrcs, ngroups;
153 register u_int i, j;
154  
155 /* Minimum len is 16, and should be a multiple of 4 */
156 if (len < 16 || len & 0x03) {
157 ND_PRINT((ndo, " [invalid len %d]", len));
158 return;
159 }
160 ND_TCHECK2(bp[6], 2);
161 ngroups = EXTRACT_16BITS(&bp[6]);
162 ND_PRINT((ndo, ", %d group record(s)", ngroups));
163 if (ndo->ndo_vflag > 0) {
164 /* Print the group records */
165 group = 8;
166 for (i=0; i<ngroups; i++) {
167 if (len < group+8) {
168 ND_PRINT((ndo, " [invalid number of groups]"));
169 return;
170 }
171 ND_TCHECK2(bp[group+4], 4);
172 ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4])));
173 ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]",
174 bp[group])));
175 nsrcs = EXTRACT_16BITS(&bp[group+2]);
176 /* Check the number of sources and print them */
177 if (len < group+8+(nsrcs<<2)) {
178 ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs));
179 return;
180 }
181 if (ndo->ndo_vflag == 1)
182 ND_PRINT((ndo, ", %d source(s)", nsrcs));
183 else {
184 /* Print the sources */
185 ND_PRINT((ndo, " {"));
186 for (j=0; j<nsrcs; j++) {
187 ND_TCHECK2(bp[group+8+(j<<2)], 4);
188 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)])));
189 }
190 ND_PRINT((ndo, " }"));
191 }
192 /* Next group record */
193 group += 8 + (nsrcs << 2);
194 ND_PRINT((ndo, "]"));
195 }
196 }
197 return;
198 trunc:
199 ND_PRINT((ndo, "%s", tstr));
200 }
201  
202 static void
203 print_igmpv3_query(netdissect_options *ndo,
204 register const u_char *bp, register u_int len)
205 {
206 u_int mrc;
207 int mrt;
208 u_int nsrcs;
209 register u_int i;
210  
211 ND_PRINT((ndo, " v3"));
212 /* Minimum len is 12, and should be a multiple of 4 */
213 if (len < 12 || len & 0x03) {
214 ND_PRINT((ndo, " [invalid len %d]", len));
215 return;
216 }
217 ND_TCHECK(bp[1]);
218 mrc = bp[1];
219 if (mrc < 128) {
220 mrt = mrc;
221 } else {
222 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3);
223 }
224 if (mrc != 100) {
225 ND_PRINT((ndo, " [max resp time "));
226 if (mrt < 600) {
227 ND_PRINT((ndo, "%.1fs", mrt * 0.1));
228 } else {
229 relts_print(ndo, mrt / 10);
230 }
231 ND_PRINT((ndo, "]"));
232 }
233 ND_TCHECK2(bp[4], 4);
234 if (EXTRACT_32BITS(&bp[4]) == 0)
235 return;
236 ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4])));
237 ND_TCHECK2(bp[10], 2);
238 nsrcs = EXTRACT_16BITS(&bp[10]);
239 if (nsrcs > 0) {
240 if (len < 12 + (nsrcs << 2))
241 ND_PRINT((ndo, " [invalid number of sources]"));
242 else if (ndo->ndo_vflag > 1) {
243 ND_PRINT((ndo, " {"));
244 for (i=0; i<nsrcs; i++) {
245 ND_TCHECK2(bp[12+(i<<2)], 4);
246 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)])));
247 }
248 ND_PRINT((ndo, " }"));
249 } else
250 ND_PRINT((ndo, ", %d source(s)", nsrcs));
251 }
252 ND_PRINT((ndo, "]"));
253 return;
254 trunc:
255 ND_PRINT((ndo, "%s", tstr));
256 }
257  
258 void
259 igmp_print(netdissect_options *ndo,
260 register const u_char *bp, register u_int len)
261 {
262 struct cksum_vec vec[1];
263  
264 if (ndo->ndo_qflag) {
265 ND_PRINT((ndo, "igmp"));
266 return;
267 }
268  
269 ND_TCHECK(bp[0]);
270 switch (bp[0]) {
271 case 0x11:
272 ND_PRINT((ndo, "igmp query"));
273 if (len >= 12)
274 print_igmpv3_query(ndo, bp, len);
275 else {
276 ND_TCHECK(bp[1]);
277 if (bp[1]) {
278 ND_PRINT((ndo, " v2"));
279 if (bp[1] != 100)
280 ND_PRINT((ndo, " [max resp time %d]", bp[1]));
281 } else
282 ND_PRINT((ndo, " v1"));
283 ND_TCHECK2(bp[4], 4);
284 if (EXTRACT_32BITS(&bp[4]))
285 ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4])));
286 if (len != 8)
287 ND_PRINT((ndo, " [len %d]", len));
288 }
289 break;
290 case 0x12:
291 ND_TCHECK2(bp[4], 4);
292 ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4])));
293 if (len != 8)
294 ND_PRINT((ndo, " [len %d]", len));
295 break;
296 case 0x16:
297 ND_TCHECK2(bp[4], 4);
298 ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4])));
299 break;
300 case 0x22:
301 ND_PRINT((ndo, "igmp v3 report"));
302 print_igmpv3_report(ndo, bp, len);
303 break;
304 case 0x17:
305 ND_TCHECK2(bp[4], 4);
306 ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4])));
307 break;
308 case 0x13:
309 ND_PRINT((ndo, "igmp dvmrp"));
310 if (len < 8)
311 ND_PRINT((ndo, " [len %d]", len));
312 else
313 dvmrp_print(ndo, bp, len);
314 break;
315 case 0x14:
316 ND_PRINT((ndo, "igmp pimv1"));
317 pimv1_print(ndo, bp, len);
318 break;
319 case 0x1e:
320 print_mresp(ndo, bp, len);
321 break;
322 case 0x1f:
323 print_mtrace(ndo, bp, len);
324 break;
325 default:
326 ND_PRINT((ndo, "igmp-%d", bp[0]));
327 break;
328 }
329  
330 if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
331 /* Check the IGMP checksum */
332 vec[0].ptr = bp;
333 vec[0].len = len;
334 if (in_cksum(vec, 1))
335 ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])));
336 }
337 return;
338 trunc:
339 ND_PRINT((ndo, "%s", tstr));
340 }