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 23 static 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 */ 49 struct 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 */ 63 struct 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 */ 99 static 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 }; 108 109 static void 110 print_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; 126 trunc: 127 (void)printf("[|igmp]"); 128 return; 129 } 130 131 static void 132 print_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; 148 trunc: 149 (void)printf("[|igmp]"); 150 return; 151 } 152 153 static void 154 print_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; 202 trunc: 203 (void)printf("[|igmp]"); 204 return; 205 } 206 207 static void 208 print_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 if (mrt < 600) { 231 (void)printf("%.1fs", mrt * 0.1); 232 } else { 233 relts_print(mrt / 10); 234 } 235 (void)printf("]"); 236 } 237 TCHECK2(bp[4], 4); 238 if (EXTRACT_32BITS(&bp[4]) == 0) 239 return; 240 (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); 241 TCHECK2(bp[10], 2); 242 nsrcs = EXTRACT_16BITS(&bp[10]); 243 if (nsrcs > 0) { 244 if (len < 12 + (nsrcs << 2)) 245 (void)printf(" [invalid number of sources]"); 246 else if (vflag > 1) { 247 (void)printf(" {"); 248 for (i=0; i<nsrcs; i++) { 249 TCHECK2(bp[12+(i<<2)], 4); 250 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); 251 } 252 (void)printf(" }"); 253 } else 254 (void)printf(", %d source(s)", nsrcs); 255 } 256 (void)printf("]"); 257 return; 258 trunc: 259 (void)printf("[|igmp]"); 260 return; 261 } 262 263 void 264 igmp_print(register const u_char *bp, register u_int len) 265 { 266 struct cksum_vec vec[1]; 267 268 if (qflag) { 269 (void)printf("igmp"); 270 return; 271 } 272 273 TCHECK(bp[0]); 274 switch (bp[0]) { 275 case 0x11: 276 (void)printf("igmp query"); 277 if (len >= 12) 278 print_igmpv3_query(bp, len); 279 else { 280 TCHECK(bp[1]); 281 if (bp[1]) { 282 (void)printf(" v2"); 283 if (bp[1] != 100) 284 (void)printf(" [max resp time %d]", bp[1]); 285 } else 286 (void)printf(" v1"); 287 TCHECK2(bp[4], 4); 288 if (EXTRACT_32BITS(&bp[4])) 289 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); 290 if (len != 8) 291 (void)printf(" [len %d]", len); 292 } 293 break; 294 case 0x12: 295 TCHECK2(bp[4], 4); 296 (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); 297 if (len != 8) 298 (void)printf(" [len %d]", len); 299 break; 300 case 0x16: 301 TCHECK2(bp[4], 4); 302 (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); 303 break; 304 case 0x22: 305 (void)printf("igmp v3 report"); 306 print_igmpv3_report(bp, len); 307 break; 308 case 0x17: 309 TCHECK2(bp[4], 4); 310 (void)printf("igmp leave %s", ipaddr_string(&bp[4])); 311 break; 312 case 0x13: 313 (void)printf("igmp dvmrp"); 314 if (len < 8) 315 (void)printf(" [len %d]", len); 316 else 317 dvmrp_print(bp, len); 318 break; 319 case 0x14: 320 (void)printf("igmp pimv1"); 321 pimv1_print(bp, len); 322 break; 323 case 0x1e: 324 print_mresp(bp, len); 325 break; 326 case 0x1f: 327 print_mtrace(bp, len); 328 break; 329 default: 330 (void)printf("igmp-%d", bp[0]); 331 break; 332 } 333 334 if (vflag && TTEST2(bp[0], len)) { 335 /* Check the IGMP checksum */ 336 vec[0].ptr = bp; 337 vec[0].len = len; 338 if (in_cksum(vec, 1)) 339 printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); 340 } 341 return; 342 trunc: 343 fputs("[|igmp]", stdout); 344 } 345