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 1.10 2024/09/02 16:15:31 christos Exp $"); 25 #endif 26 27 /* \summary: Internet Group Management Protocol (IGMP) printer */ 28 29 /* 30 * specification: 31 * 32 * RFC 2236 for IGMPv2 33 * RFC 3376 for IGMPv3 34 * draft-asaeda-mboned-mtrace-v2 for the mtrace message 35 */ 36 37 #include <config.h> 38 39 #include "netdissect-stdinc.h" 40 41 #include "netdissect.h" 42 #include "addrtoname.h" 43 #include "extract.h" 44 45 #ifndef IN_CLASSD 46 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 47 #endif 48 49 50 /* (following from ipmulti/mrouted/prune.h) */ 51 52 /* 53 * The packet format for a traceroute request. 54 */ 55 struct tr_query { 56 nd_uint32_t tr_src; /* traceroute source */ 57 nd_uint32_t tr_dst; /* traceroute destination */ 58 nd_uint32_t tr_raddr; /* traceroute response address */ 59 nd_uint8_t tr_rttl; /* response ttl */ 60 nd_uint24_t tr_qid; /* qid */ 61 }; 62 63 /* 64 * Traceroute response format. A traceroute response has a tr_query at the 65 * beginning, followed by one tr_resp for each hop taken. 66 */ 67 struct tr_resp { 68 nd_uint32_t tr_qarr; /* query arrival time */ 69 nd_uint32_t tr_inaddr; /* incoming interface address */ 70 nd_uint32_t tr_outaddr; /* outgoing interface address */ 71 nd_uint32_t tr_rmtaddr; /* parent address in source tree */ 72 nd_uint32_t tr_vifin; /* input packet count on interface */ 73 nd_uint32_t tr_vifout; /* output packet count on interface */ 74 nd_uint32_t tr_pktcnt; /* total incoming packets for src-grp */ 75 nd_uint8_t tr_rproto; /* routing proto deployed on router */ 76 nd_uint8_t tr_fttl; /* ttl required to forward on outvif */ 77 nd_uint8_t tr_smask; /* subnet mask for src addr */ 78 nd_uint8_t tr_rflags; /* forwarding error codes */ 79 }; 80 81 /* defs within mtrace */ 82 #define TR_QUERY 1 83 #define TR_RESP 2 84 85 /* fields for tr_rflags (forwarding error codes) */ 86 #define TR_NO_ERR 0 87 #define TR_WRONG_IF 1 88 #define TR_PRUNED 2 89 #define TR_OPRUNED 3 90 #define TR_SCOPED 4 91 #define TR_NO_RTE 5 92 #define TR_NO_FWD 7 93 #define TR_NO_SPACE 0x81 94 #define TR_OLD_ROUTER 0x82 95 96 /* fields for tr_rproto (routing protocol) */ 97 #define TR_PROTO_DVMRP 1 98 #define TR_PROTO_MOSPF 2 99 #define TR_PROTO_PIM 3 100 #define TR_PROTO_CBT 4 101 102 /* igmpv3 report types */ 103 static const struct tok igmpv3report2str[] = { 104 { 1, "is_in" }, 105 { 2, "is_ex" }, 106 { 3, "to_in" }, 107 { 4, "to_ex" }, 108 { 5, "allow" }, 109 { 6, "block" }, 110 { 0, NULL } 111 }; 112 113 UNALIGNED_OK 114 static void 115 print_mtrace(netdissect_options *ndo, 116 const char *typename, 117 const u_char *bp, u_int len) 118 { 119 const struct tr_query *tr = (const struct tr_query *)(bp + 8); 120 121 if (len < 8 + sizeof (struct tr_query)) { 122 ND_PRINT(" [invalid len %u]", len); 123 return; 124 } 125 ND_PRINT("%s %u: %s to %s reply-to %s", 126 typename, 127 GET_BE_U_3(tr->tr_qid), 128 GET_IPADDR_STRING(tr->tr_src), GET_IPADDR_STRING(tr->tr_dst), 129 GET_IPADDR_STRING(tr->tr_raddr)); 130 if (IN_CLASSD(GET_BE_U_4(tr->tr_raddr))) 131 ND_PRINT(" with-ttl %u", GET_U_1(tr->tr_rttl)); 132 } 133 134 static void 135 print_igmpv3_report(netdissect_options *ndo, 136 const u_char *bp, u_int len) 137 { 138 u_int group, nsrcs, ngroups; 139 u_int i, j; 140 141 /* Minimum len is 16, and should be a multiple of 4 */ 142 if (len < 16 || len & 0x03) { 143 ND_PRINT(" [invalid len %u]", len); 144 return; 145 } 146 ngroups = GET_BE_U_2(bp + 6); 147 ND_PRINT(", %u group record(s)", ngroups); 148 if (ndo->ndo_vflag > 0) { 149 /* Print the group records */ 150 group = 8; 151 for (i=0; i<ngroups; i++) { 152 if (len < group+8) { 153 ND_PRINT(" [invalid number of groups]"); 154 return; 155 } 156 ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + group + 4)); 157 ND_PRINT(" %s", tok2str(igmpv3report2str, " [v3-report-#%u]", 158 GET_U_1(bp + group))); 159 nsrcs = GET_BE_U_2(bp + group + 2); 160 /* Check the number of sources and print them */ 161 if (len < group+8+(nsrcs<<2)) { 162 ND_PRINT(" [invalid number of sources %u]", nsrcs); 163 return; 164 } 165 if (ndo->ndo_vflag == 1) 166 ND_PRINT(", %u source(s)", nsrcs); 167 else { 168 /* Print the sources */ 169 ND_PRINT(" {"); 170 for (j=0; j<nsrcs; j++) { 171 ND_PRINT(" %s", GET_IPADDR_STRING(bp + group + 8 + (j << 2))); 172 } 173 ND_PRINT(" }"); 174 } 175 /* Next group record */ 176 group += 8 + (nsrcs << 2); 177 ND_PRINT("]"); 178 } 179 } 180 } 181 182 static void 183 print_igmpv3_query(netdissect_options *ndo, 184 const u_char *bp, u_int len) 185 { 186 u_int mrc; 187 u_int mrt; 188 u_int nsrcs; 189 u_int i; 190 191 ND_PRINT(" v3"); 192 /* Minimum len is 12, and should be a multiple of 4 */ 193 if (len < 12 || len & 0x03) { 194 ND_PRINT(" [invalid len %u]", len); 195 return; 196 } 197 mrc = GET_U_1(bp + 1); 198 if (mrc < 128) { 199 mrt = mrc; 200 } else { 201 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 202 } 203 if (mrc != 100) { 204 ND_PRINT(" [max resp time "); 205 if (mrt < 600) { 206 ND_PRINT("%.1fs", mrt * 0.1); 207 } else { 208 unsigned_relts_print(ndo, mrt / 10); 209 } 210 ND_PRINT("]"); 211 } 212 if (GET_BE_U_4(bp + 4) == 0) 213 return; 214 ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + 4)); 215 nsrcs = GET_BE_U_2(bp + 10); 216 if (nsrcs > 0) { 217 if (len < 12 + (nsrcs << 2)) 218 ND_PRINT(" [invalid number of sources]"); 219 else if (ndo->ndo_vflag > 1) { 220 ND_PRINT(" {"); 221 for (i=0; i<nsrcs; i++) { 222 ND_PRINT(" %s", GET_IPADDR_STRING(bp + 12 + (i << 2))); 223 } 224 ND_PRINT(" }"); 225 } else 226 ND_PRINT(", %u source(s)", nsrcs); 227 } 228 ND_PRINT("]"); 229 } 230 231 void 232 igmp_print(netdissect_options *ndo, 233 const u_char *bp, u_int len) 234 { 235 struct cksum_vec vec[1]; 236 237 ndo->ndo_protocol = "igmp"; 238 if (ndo->ndo_qflag) { 239 ND_PRINT("igmp"); 240 return; 241 } 242 243 switch (GET_U_1(bp)) { 244 case 0x11: 245 ND_PRINT("igmp query"); 246 if (len >= 12) 247 print_igmpv3_query(ndo, bp, len); 248 else { 249 if (GET_U_1(bp + 1)) { 250 ND_PRINT(" v2"); 251 if (GET_U_1(bp + 1) != 100) 252 ND_PRINT(" [max resp time %u]", GET_U_1(bp + 1)); 253 } else 254 ND_PRINT(" v1"); 255 if (GET_BE_U_4(bp + 4)) 256 ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4)); 257 if (len != 8) 258 ND_PRINT(" [len %u]", len); 259 } 260 break; 261 case 0x12: 262 ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4)); 263 if (len != 8) 264 ND_PRINT(" [len %u]", len); 265 break; 266 case 0x16: 267 ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4)); 268 break; 269 case 0x22: 270 ND_PRINT("igmp v3 report"); 271 print_igmpv3_report(ndo, bp, len); 272 break; 273 case 0x17: 274 ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4)); 275 break; 276 case 0x13: 277 ND_PRINT("igmp dvmrp"); 278 if (len < 8) 279 ND_PRINT(" [len %u]", len); 280 else 281 dvmrp_print(ndo, bp, len); 282 break; 283 case 0x14: 284 ND_PRINT("igmp pimv1"); 285 pimv1_print(ndo, bp, len); 286 break; 287 case 0x1e: 288 print_mtrace(ndo, "mresp", bp, len); 289 break; 290 case 0x1f: 291 print_mtrace(ndo, "mtrace", bp, len); 292 break; 293 default: 294 ND_PRINT("igmp-%u", GET_U_1(bp)); 295 break; 296 } 297 298 if (ndo->ndo_vflag && len >= 4 && ND_TTEST_LEN(bp, len)) { 299 /* Check the IGMP checksum */ 300 vec[0].ptr = bp; 301 vec[0].len = len; 302 if (in_cksum(vec, 1)) 303 ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2)); 304 } 305 } 306