print-igmp.c revision 1.4.8.1
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 __RCSID("$NetBSD: print-igmp.c,v 1.4.8.1 2017/03/13 07:41:14 skrll Exp $"); 25 #endif 26 27 /* \summary: Internet Group Management Protocol (IGMP) printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <netdissect-stdinc.h> 34 35 #include "netdissect.h" 36 #include "addrtoname.h" 37 #include "extract.h" 38 39 #ifndef IN_CLASSD 40 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 41 #endif 42 43 static const char tstr[] = "[|igmp]"; 44 45 /* (following from ipmulti/mrouted/prune.h) */ 46 47 /* 48 * The packet format for a traceroute request. 49 */ 50 struct tr_query { 51 uint32_t tr_src; /* traceroute source */ 52 uint32_t tr_dst; /* traceroute destination */ 53 uint32_t tr_raddr; /* traceroute response address */ 54 uint32_t tr_rttlqid; /* response ttl and qid */ 55 }; 56 57 #define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) 58 #define TR_GETQID(x) ((x) & 0x00ffffff) 59 60 /* 61 * Traceroute response format. A traceroute response has a tr_query at the 62 * beginning, followed by one tr_resp for each hop taken. 63 */ 64 struct tr_resp { 65 uint32_t tr_qarr; /* query arrival time */ 66 uint32_t tr_inaddr; /* incoming interface address */ 67 uint32_t tr_outaddr; /* outgoing interface address */ 68 uint32_t tr_rmtaddr; /* parent address in source tree */ 69 uint32_t tr_vifin; /* input packet count on interface */ 70 uint32_t tr_vifout; /* output packet count on interface */ 71 uint32_t tr_pktcnt; /* total incoming packets for src-grp */ 72 uint8_t tr_rproto; /* routing proto deployed on router */ 73 uint8_t tr_fttl; /* ttl required to forward on outvif */ 74 uint8_t tr_smask; /* subnet mask for src addr */ 75 uint8_t tr_rflags; /* forwarding error codes */ 76 }; 77 78 /* defs within mtrace */ 79 #define TR_QUERY 1 80 #define TR_RESP 2 81 82 /* fields for tr_rflags (forwarding error codes) */ 83 #define TR_NO_ERR 0 84 #define TR_WRONG_IF 1 85 #define TR_PRUNED 2 86 #define TR_OPRUNED 3 87 #define TR_SCOPED 4 88 #define TR_NO_RTE 5 89 #define TR_NO_FWD 7 90 #define TR_NO_SPACE 0x81 91 #define TR_OLD_ROUTER 0x82 92 93 /* fields for tr_rproto (routing protocol) */ 94 #define TR_PROTO_DVMRP 1 95 #define TR_PROTO_MOSPF 2 96 #define TR_PROTO_PIM 3 97 #define TR_PROTO_CBT 4 98 99 /* igmpv3 report types */ 100 static const struct tok igmpv3report2str[] = { 101 { 1, "is_in" }, 102 { 2, "is_ex" }, 103 { 3, "to_in" }, 104 { 4, "to_ex" }, 105 { 5, "allow" }, 106 { 6, "block" }, 107 { 0, NULL } 108 }; 109 110 static void 111 print_mtrace(netdissect_options *ndo, 112 register const u_char *bp, register u_int len) 113 { 114 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 115 116 ND_TCHECK(*tr); 117 if (len < 8 + sizeof (struct tr_query)) { 118 ND_PRINT((ndo, " [invalid len %d]", len)); 119 return; 120 } 121 ND_PRINT((ndo, "mtrace %u: %s to %s reply-to %s", 122 TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 123 ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), 124 ipaddr_string(ndo, &tr->tr_raddr))); 125 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 126 ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); 127 return; 128 trunc: 129 ND_PRINT((ndo, "%s", tstr)); 130 } 131 132 static void 133 print_mresp(netdissect_options *ndo, 134 register const u_char *bp, register u_int len) 135 { 136 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 137 138 ND_TCHECK(*tr); 139 if (len < 8 + sizeof (struct tr_query)) { 140 ND_PRINT((ndo, " [invalid len %d]", len)); 141 return; 142 } 143 ND_PRINT((ndo, "mresp %lu: %s to %s reply-to %s", 144 (u_long)TR_GETQID(EXTRACT_32BITS(&tr->tr_rttlqid)), 145 ipaddr_string(ndo, &tr->tr_src), ipaddr_string(ndo, &tr->tr_dst), 146 ipaddr_string(ndo, &tr->tr_raddr))); 147 if (IN_CLASSD(EXTRACT_32BITS(&tr->tr_raddr))) 148 ND_PRINT((ndo, " with-ttl %d", TR_GETTTL(EXTRACT_32BITS(&tr->tr_rttlqid)))); 149 return; 150 trunc: 151 ND_PRINT((ndo, "%s", tstr)); 152 } 153 154 static void 155 print_igmpv3_report(netdissect_options *ndo, 156 register const u_char *bp, register u_int len) 157 { 158 u_int group, nsrcs, ngroups; 159 register u_int i, j; 160 161 /* Minimum len is 16, and should be a multiple of 4 */ 162 if (len < 16 || len & 0x03) { 163 ND_PRINT((ndo, " [invalid len %d]", len)); 164 return; 165 } 166 ND_TCHECK2(bp[6], 2); 167 ngroups = EXTRACT_16BITS(&bp[6]); 168 ND_PRINT((ndo, ", %d group record(s)", ngroups)); 169 if (ndo->ndo_vflag > 0) { 170 /* Print the group records */ 171 group = 8; 172 for (i=0; i<ngroups; i++) { 173 if (len < group+8) { 174 ND_PRINT((ndo, " [invalid number of groups]")); 175 return; 176 } 177 ND_TCHECK2(bp[group+4], 4); 178 ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[group+4]))); 179 ND_PRINT((ndo, " %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 180 bp[group]))); 181 nsrcs = EXTRACT_16BITS(&bp[group+2]); 182 /* Check the number of sources and print them */ 183 if (len < group+8+(nsrcs<<2)) { 184 ND_PRINT((ndo, " [invalid number of sources %d]", nsrcs)); 185 return; 186 } 187 if (ndo->ndo_vflag == 1) 188 ND_PRINT((ndo, ", %d source(s)", nsrcs)); 189 else { 190 /* Print the sources */ 191 ND_PRINT((ndo, " {")); 192 for (j=0; j<nsrcs; j++) { 193 ND_TCHECK2(bp[group+8+(j<<2)], 4); 194 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[group+8+(j<<2)]))); 195 } 196 ND_PRINT((ndo, " }")); 197 } 198 /* Next group record */ 199 group += 8 + (nsrcs << 2); 200 ND_PRINT((ndo, "]")); 201 } 202 } 203 return; 204 trunc: 205 ND_PRINT((ndo, "%s", tstr)); 206 } 207 208 static void 209 print_igmpv3_query(netdissect_options *ndo, 210 register const u_char *bp, register u_int len) 211 { 212 u_int mrc; 213 u_int mrt; 214 u_int nsrcs; 215 register u_int i; 216 217 ND_PRINT((ndo, " v3")); 218 /* Minimum len is 12, and should be a multiple of 4 */ 219 if (len < 12 || len & 0x03) { 220 ND_PRINT((ndo, " [invalid len %d]", len)); 221 return; 222 } 223 ND_TCHECK(bp[1]); 224 mrc = bp[1]; 225 if (mrc < 128) { 226 mrt = mrc; 227 } else { 228 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 229 } 230 if (mrc != 100) { 231 ND_PRINT((ndo, " [max resp time ")); 232 if (mrt < 600) { 233 ND_PRINT((ndo, "%.1fs", mrt * 0.1)); 234 } else { 235 unsigned_relts_print(ndo, mrt / 10); 236 } 237 ND_PRINT((ndo, "]")); 238 } 239 ND_TCHECK2(bp[4], 4); 240 if (EXTRACT_32BITS(&bp[4]) == 0) 241 return; 242 ND_PRINT((ndo, " [gaddr %s", ipaddr_string(ndo, &bp[4]))); 243 ND_TCHECK2(bp[10], 2); 244 nsrcs = EXTRACT_16BITS(&bp[10]); 245 if (nsrcs > 0) { 246 if (len < 12 + (nsrcs << 2)) 247 ND_PRINT((ndo, " [invalid number of sources]")); 248 else if (ndo->ndo_vflag > 1) { 249 ND_PRINT((ndo, " {")); 250 for (i=0; i<nsrcs; i++) { 251 ND_TCHECK2(bp[12+(i<<2)], 4); 252 ND_PRINT((ndo, " %s", ipaddr_string(ndo, &bp[12+(i<<2)]))); 253 } 254 ND_PRINT((ndo, " }")); 255 } else 256 ND_PRINT((ndo, ", %d source(s)", nsrcs)); 257 } 258 ND_PRINT((ndo, "]")); 259 return; 260 trunc: 261 ND_PRINT((ndo, "%s", tstr)); 262 } 263 264 void 265 igmp_print(netdissect_options *ndo, 266 register const u_char *bp, register u_int len) 267 { 268 struct cksum_vec vec[1]; 269 270 if (ndo->ndo_qflag) { 271 ND_PRINT((ndo, "igmp")); 272 return; 273 } 274 275 ND_TCHECK(bp[0]); 276 switch (bp[0]) { 277 case 0x11: 278 ND_PRINT((ndo, "igmp query")); 279 if (len >= 12) 280 print_igmpv3_query(ndo, bp, len); 281 else { 282 ND_TCHECK(bp[1]); 283 if (bp[1]) { 284 ND_PRINT((ndo, " v2")); 285 if (bp[1] != 100) 286 ND_PRINT((ndo, " [max resp time %d]", bp[1])); 287 } else 288 ND_PRINT((ndo, " v1")); 289 ND_TCHECK2(bp[4], 4); 290 if (EXTRACT_32BITS(&bp[4])) 291 ND_PRINT((ndo, " [gaddr %s]", ipaddr_string(ndo, &bp[4]))); 292 if (len != 8) 293 ND_PRINT((ndo, " [len %d]", len)); 294 } 295 break; 296 case 0x12: 297 ND_TCHECK2(bp[4], 4); 298 ND_PRINT((ndo, "igmp v1 report %s", ipaddr_string(ndo, &bp[4]))); 299 if (len != 8) 300 ND_PRINT((ndo, " [len %d]", len)); 301 break; 302 case 0x16: 303 ND_TCHECK2(bp[4], 4); 304 ND_PRINT((ndo, "igmp v2 report %s", ipaddr_string(ndo, &bp[4]))); 305 break; 306 case 0x22: 307 ND_PRINT((ndo, "igmp v3 report")); 308 print_igmpv3_report(ndo, bp, len); 309 break; 310 case 0x17: 311 ND_TCHECK2(bp[4], 4); 312 ND_PRINT((ndo, "igmp leave %s", ipaddr_string(ndo, &bp[4]))); 313 break; 314 case 0x13: 315 ND_PRINT((ndo, "igmp dvmrp")); 316 if (len < 8) 317 ND_PRINT((ndo, " [len %d]", len)); 318 else 319 dvmrp_print(ndo, bp, len); 320 break; 321 case 0x14: 322 ND_PRINT((ndo, "igmp pimv1")); 323 pimv1_print(ndo, bp, len); 324 break; 325 case 0x1e: 326 print_mresp(ndo, bp, len); 327 break; 328 case 0x1f: 329 print_mtrace(ndo, bp, len); 330 break; 331 default: 332 ND_PRINT((ndo, "igmp-%d", bp[0])); 333 break; 334 } 335 336 if (ndo->ndo_vflag && len >= 4 && ND_TTEST2(bp[0], len)) { 337 /* Check the IGMP checksum */ 338 vec[0].ptr = bp; 339 vec[0].len = len; 340 if (in_cksum(vec, 1)) 341 ND_PRINT((ndo, " bad igmp cksum %x!", EXTRACT_16BITS(&bp[2]))); 342 } 343 return; 344 trunc: 345 ND_PRINT((ndo, "%s", tstr)); 346 } 347
Indexes created Mon Apr 13 00:22:24 UTC 2026