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 #include <sys/cdefs.h> 23 #ifndef lint 24 #if 0 25 static const char rcsid[] _U_ = 26 "@(#) Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.15 2004-03-24 00:59:16 guy Exp (LBL)"; 27 #else 28 __RCSID("$NetBSD: print-igmp.c,v 1.4 2013/12/31 17:33:31 christos Exp $"); 29 #endif 30 #endif 31 32 #ifdef HAVE_CONFIG_H 33 #include "config.h" 34 #endif 35 36 #include <tcpdump-stdinc.h> 37 38 #include <stdio.h> 39 #include <string.h> 40 41 #include "interface.h" 42 #include "addrtoname.h" 43 #include "extract.h" /* must come after interface.h */ 44 45 #ifndef IN_CLASSD 46 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 47 #endif 48 49 /* (following from ipmulti/mrouted/prune.h) */ 50 51 /* 52 * The packet format for a traceroute request. 53 */ 54 struct tr_query { 55 u_int32_t tr_src; /* traceroute source */ 56 u_int32_t tr_dst; /* traceroute destination */ 57 u_int32_t tr_raddr; /* traceroute response address */ 58 u_int32_t tr_rttlqid; /* response ttl and qid */ 59 }; 60 61 #define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) 62 #define TR_GETQID(x) ((x) & 0x00ffffff) 63 64 /* 65 * Traceroute response format. A traceroute response has a tr_query at the 66 * beginning, followed by one tr_resp for each hop taken. 67 */ 68 struct tr_resp { 69 u_int32_t tr_qarr; /* query arrival time */ 70 u_int32_t tr_inaddr; /* incoming interface address */ 71 u_int32_t tr_outaddr; /* outgoing interface address */ 72 u_int32_t tr_rmtaddr; /* parent address in source tree */ 73 u_int32_t tr_vifin; /* input packet count on interface */ 74 u_int32_t tr_vifout; /* output packet count on interface */ 75 u_int32_t tr_pktcnt; /* total incoming packets for src-grp */ 76 u_int8_t tr_rproto; /* routing proto deployed on router */ 77 u_int8_t tr_fttl; /* ttl required to forward on outvif */ 78 u_int8_t tr_smask; /* subnet mask for src addr */ 79 u_int8_t tr_rflags; /* forwarding error codes */ 80 }; 81 82 /* defs within mtrace */ 83 #define TR_QUERY 1 84 #define TR_RESP 2 85 86 /* fields for tr_rflags (forwarding error codes) */ 87 #define TR_NO_ERR 0 88 #define TR_WRONG_IF 1 89 #define TR_PRUNED 2 90 #define TR_OPRUNED 3 91 #define TR_SCOPED 4 92 #define TR_NO_RTE 5 93 #define TR_NO_FWD 7 94 #define TR_NO_SPACE 0x81 95 #define TR_OLD_ROUTER 0x82 96 97 /* fields for tr_rproto (routing protocol) */ 98 #define TR_PROTO_DVMRP 1 99 #define TR_PROTO_MOSPF 2 100 #define TR_PROTO_PIM 3 101 #define TR_PROTO_CBT 4 102 103 /* igmpv3 report types */ 104 static const struct tok igmpv3report2str[] = { 105 { 1, "is_in" }, 106 { 2, "is_ex" }, 107 { 3, "to_in" }, 108 { 4, "to_ex" }, 109 { 5, "allow" }, 110 { 6, "block" }, 111 { 0, NULL } 112 }; 113 114 static void 115 print_mtrace(register const u_char *bp, register u_int len) 116 { 117 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 118 119 TCHECK(*tr); 120 if (len < 8 + sizeof (struct tr_query)) { 121 (void)printf(" [invalid len %d]", len); 122 return; 123 } 124 printf("mtrace %u: %s to %s reply-to %s", 125 TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 126 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 127 ipaddr_string(&tr->tr_raddr)); 128 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 129 printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); 130 return; 131 trunc: 132 (void)printf("[|igmp]"); 133 return; 134 } 135 136 static void 137 print_mresp(register const u_char *bp, register u_int len) 138 { 139 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 140 141 TCHECK(*tr); 142 if (len < 8 + sizeof (struct tr_query)) { 143 (void)printf(" [invalid len %d]", len); 144 return; 145 } 146 printf("mresp %lu: %s to %s reply-to %s", 147 (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 148 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 149 ipaddr_string(&tr->tr_raddr)); 150 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 151 printf(" with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid))); 152 return; 153 trunc: 154 (void)printf("[|igmp]"); 155 return; 156 } 157 158 static void 159 print_igmpv3_report(register const u_char *bp, register u_int len) 160 { 161 u_int group, nsrcs, ngroups; 162 register u_int i, j; 163 164 /* Minimum len is 16, and should be a multiple of 4 */ 165 if (len < 16 || len & 0x03) { 166 (void)printf(" [invalid len %d]", len); 167 return; 168 } 169 TCHECK2(bp[6], 2); 170 ngroups = EXTRACT_16BITS(&bp[6]); 171 (void)printf(", %d group record(s)", ngroups); 172 if (vflag > 0) { 173 /* Print the group records */ 174 group = 8; 175 for (i=0; i<ngroups; i++) { 176 if (len < group+8) { 177 (void)printf(" [invalid number of groups]"); 178 return; 179 } 180 TCHECK2(bp[group+4], 4); 181 (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4])); 182 (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 183 bp[group])); 184 nsrcs = EXTRACT_16BITS(&bp[group+2]); 185 /* Check the number of sources and print them */ 186 if (len < group+8+(nsrcs<<2)) { 187 (void)printf(" [invalid number of sources %d]", nsrcs); 188 return; 189 } 190 if (vflag == 1) 191 (void)printf(", %d source(s)", nsrcs); 192 else { 193 /* Print the sources */ 194 (void)printf(" {"); 195 for (j=0; j<nsrcs; j++) { 196 TCHECK2(bp[group+8+(j<<2)], 4); 197 (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)])); 198 } 199 (void)printf(" }"); 200 } 201 /* Next group record */ 202 group += 8 + (nsrcs << 2); 203 (void)printf("]"); 204 } 205 } 206 return; 207 trunc: 208 (void)printf("[|igmp]"); 209 return; 210 } 211 212 static void 213 print_igmpv3_query(register const u_char *bp, register u_int len) 214 { 215 u_int mrc; 216 int mrt; 217 u_int nsrcs; 218 register u_int i; 219 220 (void)printf(" v3"); 221 /* Minimum len is 12, and should be a multiple of 4 */ 222 if (len < 12 || len & 0x03) { 223 (void)printf(" [invalid len %d]", len); 224 return; 225 } 226 TCHECK(bp[1]); 227 mrc = bp[1]; 228 if (mrc < 128) { 229 mrt = mrc; 230 } else { 231 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 232 } 233 if (mrc != 100) { 234 (void)printf(" [max resp time "); 235 if (mrt < 600) { 236 (void)printf("%.1fs", mrt * 0.1); 237 } else { 238 relts_print(mrt / 10); 239 } 240 (void)printf("]"); 241 } 242 TCHECK2(bp[4], 4); 243 if (EXTRACT_32BITS(&bp[4]) == 0) 244 return; 245 (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); 246 TCHECK2(bp[10], 2); 247 nsrcs = EXTRACT_16BITS(&bp[10]); 248 if (nsrcs > 0) { 249 if (len < 12 + (nsrcs << 2)) 250 (void)printf(" [invalid number of sources]"); 251 else if (vflag > 1) { 252 (void)printf(" {"); 253 for (i=0; i<nsrcs; i++) { 254 TCHECK2(bp[12+(i<<2)], 4); 255 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); 256 } 257 (void)printf(" }"); 258 } else 259 (void)printf(", %d source(s)", nsrcs); 260 } 261 (void)printf("]"); 262 return; 263 trunc: 264 (void)printf("[|igmp]"); 265 return; 266 } 267 268 void 269 igmp_print(register const u_char *bp, register u_int len) 270 { 271 struct cksum_vec vec[1]; 272 273 if (qflag) { 274 (void)printf("igmp"); 275 return; 276 } 277 278 TCHECK(bp[0]); 279 switch (bp[0]) { 280 case 0x11: 281 (void)printf("igmp query"); 282 if (len >= 12) 283 print_igmpv3_query(bp, len); 284 else { 285 TCHECK(bp[1]); 286 if (bp[1]) { 287 (void)printf(" v2"); 288 if (bp[1] != 100) 289 (void)printf(" [max resp time %d]", bp[1]); 290 } else 291 (void)printf(" v1"); 292 TCHECK2(bp[4], 4); 293 if (EXTRACT_32BITS(&bp[4])) 294 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); 295 if (len != 8) 296 (void)printf(" [len %d]", len); 297 } 298 break; 299 case 0x12: 300 TCHECK2(bp[4], 4); 301 (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); 302 if (len != 8) 303 (void)printf(" [len %d]", len); 304 break; 305 case 0x16: 306 TCHECK2(bp[4], 4); 307 (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); 308 break; 309 case 0x22: 310 (void)printf("igmp v3 report"); 311 print_igmpv3_report(bp, len); 312 break; 313 case 0x17: 314 TCHECK2(bp[4], 4); 315 (void)printf("igmp leave %s", ipaddr_string(&bp[4])); 316 break; 317 case 0x13: 318 (void)printf("igmp dvmrp"); 319 if (len < 8) 320 (void)printf(" [len %d]", len); 321 else 322 dvmrp_print(bp, len); 323 break; 324 case 0x14: 325 (void)printf("igmp pimv1"); 326 pimv1_print(bp, len); 327 break; 328 case 0x1e: 329 print_mresp(bp, len); 330 break; 331 case 0x1f: 332 print_mtrace(bp, len); 333 break; 334 default: 335 (void)printf("igmp-%d", bp[0]); 336 break; 337 } 338 339 if (vflag && TTEST2(bp[0], len)) { 340 /* Check the IGMP checksum */ 341 vec[0].ptr = bp; 342 vec[0].len = len; 343 if (in_cksum(vec, 1)) 344 printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); 345 } 346 return; 347 trunc: 348 fputs("[|igmp]", stdout); 349 } 350