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 1.9 2023/08/17 20:19:40 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 #ifdef HAVE_CONFIG_H 38 #include <config.h> 39 #endif 40 41 #include "netdissect-stdinc.h" 42 43 #include "netdissect.h" 44 #include "addrtoname.h" 45 #include "extract.h" 46 47 #ifndef IN_CLASSD 48 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 49 #endif 50 51 52 /* (following from ipmulti/mrouted/prune.h) */ 53 54 /* 55 * The packet format for a traceroute request. 56 */ 57 struct tr_query { 58 nd_uint32_t tr_src; /* traceroute source */ 59 nd_uint32_t tr_dst; /* traceroute destination */ 60 nd_uint32_t tr_raddr; /* traceroute response address */ 61 nd_uint8_t tr_rttl; /* response ttl */ 62 nd_uint24_t tr_qid; /* qid */ 63 }; 64 65 /* 66 * Traceroute response format. A traceroute response has a tr_query at the 67 * beginning, followed by one tr_resp for each hop taken. 68 */ 69 struct tr_resp { 70 nd_uint32_t tr_qarr; /* query arrival time */ 71 nd_uint32_t tr_inaddr; /* incoming interface address */ 72 nd_uint32_t tr_outaddr; /* outgoing interface address */ 73 nd_uint32_t tr_rmtaddr; /* parent address in source tree */ 74 nd_uint32_t tr_vifin; /* input packet count on interface */ 75 nd_uint32_t tr_vifout; /* output packet count on interface */ 76 nd_uint32_t tr_pktcnt; /* total incoming packets for src-grp */ 77 nd_uint8_t tr_rproto; /* routing proto deployed on router */ 78 nd_uint8_t tr_fttl; /* ttl required to forward on outvif */ 79 nd_uint8_t tr_smask; /* subnet mask for src addr */ 80 nd_uint8_t tr_rflags; /* forwarding error codes */ 81 }; 82 83 /* defs within mtrace */ 84 #define TR_QUERY 1 85 #define TR_RESP 2 86 87 /* fields for tr_rflags (forwarding error codes) */ 88 #define TR_NO_ERR 0 89 #define TR_WRONG_IF 1 90 #define TR_PRUNED 2 91 #define TR_OPRUNED 3 92 #define TR_SCOPED 4 93 #define TR_NO_RTE 5 94 #define TR_NO_FWD 7 95 #define TR_NO_SPACE 0x81 96 #define TR_OLD_ROUTER 0x82 97 98 /* fields for tr_rproto (routing protocol) */ 99 #define TR_PROTO_DVMRP 1 100 #define TR_PROTO_MOSPF 2 101 #define TR_PROTO_PIM 3 102 #define TR_PROTO_CBT 4 103 104 /* igmpv3 report types */ 105 static const struct tok igmpv3report2str[] = { 106 { 1, "is_in" }, 107 { 2, "is_ex" }, 108 { 3, "to_in" }, 109 { 4, "to_ex" }, 110 { 5, "allow" }, 111 { 6, "block" }, 112 { 0, NULL } 113 }; 114 115 UNALIGNED_OK 116 static void 117 print_mtrace(netdissect_options *ndo, 118 const char *typename, 119 const u_char *bp, u_int len) 120 { 121 const struct tr_query *tr = (const struct tr_query *)(bp + 8); 122 123 if (len < 8 + sizeof (struct tr_query)) { 124 ND_PRINT(" [invalid len %u]", len); 125 return; 126 } 127 ND_PRINT("%s %u: %s to %s reply-to %s", 128 typename, 129 GET_BE_U_3(tr->tr_qid), 130 GET_IPADDR_STRING(tr->tr_src), GET_IPADDR_STRING(tr->tr_dst), 131 GET_IPADDR_STRING(tr->tr_raddr)); 132 if (IN_CLASSD(GET_BE_U_4(tr->tr_raddr))) 133 ND_PRINT(" with-ttl %u", GET_U_1(tr->tr_rttl)); 134 } 135 136 static void 137 print_igmpv3_report(netdissect_options *ndo, 138 const u_char *bp, u_int len) 139 { 140 u_int group, nsrcs, ngroups; 141 u_int i, j; 142 143 /* Minimum len is 16, and should be a multiple of 4 */ 144 if (len < 16 || len & 0x03) { 145 ND_PRINT(" [invalid len %u]", len); 146 return; 147 } 148 ngroups = GET_BE_U_2(bp + 6); 149 ND_PRINT(", %u group record(s)", ngroups); 150 if (ndo->ndo_vflag > 0) { 151 /* Print the group records */ 152 group = 8; 153 for (i=0; i<ngroups; i++) { 154 if (len < group+8) { 155 ND_PRINT(" [invalid number of groups]"); 156 return; 157 } 158 ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + group + 4)); 159 ND_PRINT(" %s", tok2str(igmpv3report2str, " [v3-report-#%u]", 160 GET_U_1(bp + group))); 161 nsrcs = GET_BE_U_2(bp + group + 2); 162 /* Check the number of sources and print them */ 163 if (len < group+8+(nsrcs<<2)) { 164 ND_PRINT(" [invalid number of sources %u]", nsrcs); 165 return; 166 } 167 if (ndo->ndo_vflag == 1) 168 ND_PRINT(", %u source(s)", nsrcs); 169 else { 170 /* Print the sources */ 171 ND_PRINT(" {"); 172 for (j=0; j<nsrcs; j++) { 173 ND_PRINT(" %s", GET_IPADDR_STRING(bp + group + 8 + (j << 2))); 174 } 175 ND_PRINT(" }"); 176 } 177 /* Next group record */ 178 group += 8 + (nsrcs << 2); 179 ND_PRINT("]"); 180 } 181 } 182 } 183 184 static void 185 print_igmpv3_query(netdissect_options *ndo, 186 const u_char *bp, u_int len) 187 { 188 u_int mrc; 189 u_int mrt; 190 u_int nsrcs; 191 u_int i; 192 193 ND_PRINT(" v3"); 194 /* Minimum len is 12, and should be a multiple of 4 */ 195 if (len < 12 || len & 0x03) { 196 ND_PRINT(" [invalid len %u]", len); 197 return; 198 } 199 mrc = GET_U_1(bp + 1); 200 if (mrc < 128) { 201 mrt = mrc; 202 } else { 203 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 204 } 205 if (mrc != 100) { 206 ND_PRINT(" [max resp time "); 207 if (mrt < 600) { 208 ND_PRINT("%.1fs", mrt * 0.1); 209 } else { 210 unsigned_relts_print(ndo, mrt / 10); 211 } 212 ND_PRINT("]"); 213 } 214 if (GET_BE_U_4(bp + 4) == 0) 215 return; 216 ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + 4)); 217 nsrcs = GET_BE_U_2(bp + 10); 218 if (nsrcs > 0) { 219 if (len < 12 + (nsrcs << 2)) 220 ND_PRINT(" [invalid number of sources]"); 221 else if (ndo->ndo_vflag > 1) { 222 ND_PRINT(" {"); 223 for (i=0; i<nsrcs; i++) { 224 ND_PRINT(" %s", GET_IPADDR_STRING(bp + 12 + (i << 2))); 225 } 226 ND_PRINT(" }"); 227 } else 228 ND_PRINT(", %u source(s)", nsrcs); 229 } 230 ND_PRINT("]"); 231 } 232 233 void 234 igmp_print(netdissect_options *ndo, 235 const u_char *bp, u_int len) 236 { 237 struct cksum_vec vec[1]; 238 239 ndo->ndo_protocol = "igmp"; 240 if (ndo->ndo_qflag) { 241 ND_PRINT("igmp"); 242 return; 243 } 244 245 switch (GET_U_1(bp)) { 246 case 0x11: 247 ND_PRINT("igmp query"); 248 if (len >= 12) 249 print_igmpv3_query(ndo, bp, len); 250 else { 251 if (GET_U_1(bp + 1)) { 252 ND_PRINT(" v2"); 253 if (GET_U_1(bp + 1) != 100) 254 ND_PRINT(" [max resp time %u]", GET_U_1(bp + 1)); 255 } else 256 ND_PRINT(" v1"); 257 if (GET_BE_U_4(bp + 4)) 258 ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4)); 259 if (len != 8) 260 ND_PRINT(" [len %u]", len); 261 } 262 break; 263 case 0x12: 264 ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4)); 265 if (len != 8) 266 ND_PRINT(" [len %u]", len); 267 break; 268 case 0x16: 269 ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4)); 270 break; 271 case 0x22: 272 ND_PRINT("igmp v3 report"); 273 print_igmpv3_report(ndo, bp, len); 274 break; 275 case 0x17: 276 ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4)); 277 break; 278 case 0x13: 279 ND_PRINT("igmp dvmrp"); 280 if (len < 8) 281 ND_PRINT(" [len %u]", len); 282 else 283 dvmrp_print(ndo, bp, len); 284 break; 285 case 0x14: 286 ND_PRINT("igmp pimv1"); 287 pimv1_print(ndo, bp, len); 288 break; 289 case 0x1e: 290 print_mtrace(ndo, "mresp", bp, len); 291 break; 292 case 0x1f: 293 print_mtrace(ndo, "mtrace", bp, len); 294 break; 295 default: 296 ND_PRINT("igmp-%u", GET_U_1(bp)); 297 break; 298 } 299 300 if (ndo->ndo_vflag && len >= 4 && ND_TTEST_LEN(bp, len)) { 301 /* Check the IGMP checksum */ 302 vec[0].ptr = bp; 303 vec[0].len = len; 304 if (in_cksum(vec, 1)) 305 ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2)); 306 } 307 } 308