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 } 341
