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 #ifndef lint 23 static const char rcsid[] = 24 "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.5.4.1 2002/06/02 18:25:05 guy Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 34 #include <netinet/in.h> 35 36 #include <stdio.h> 37 #include <string.h> 38 39 #include "interface.h" 40 #include "addrtoname.h" 41 #include "extract.h" /* must come after interface.h */ 42 43 #ifndef IN_CLASSD 44 #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) 45 #endif 46 47 /* (following from ipmulti/mrouted/prune.h) */ 48 49 /* 50 * The packet format for a traceroute request. 51 */ 52 struct tr_query { 53 u_int tr_src; /* traceroute source */ 54 u_int tr_dst; /* traceroute destination */ 55 u_int tr_raddr; /* traceroute response address */ 56 u_int tr_rttlqid; /* response ttl and qid */ 57 }; 58 59 #define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) 60 #define TR_GETQID(x) ((x) & 0x00ffffff) 61 62 /* 63 * Traceroute response format. A traceroute response has a tr_query at the 64 * beginning, followed by one tr_resp for each hop taken. 65 */ 66 struct tr_resp { 67 u_int tr_qarr; /* query arrival time */ 68 u_int tr_inaddr; /* incoming interface address */ 69 u_int tr_outaddr; /* outgoing interface address */ 70 u_int tr_rmtaddr; /* parent address in source tree */ 71 u_int tr_vifin; /* input packet count on interface */ 72 u_int tr_vifout; /* output packet count on interface */ 73 u_int tr_pktcnt; /* total incoming packets for src-grp */ 74 u_char tr_rproto; /* routing proto deployed on router */ 75 u_char tr_fttl; /* ttl required to forward on outvif */ 76 u_char tr_smask; /* subnet mask for src addr */ 77 u_char tr_rflags; /* forwarding error codes */ 78 }; 79 80 /* defs within mtrace */ 81 #define TR_QUERY 1 82 #define TR_RESP 2 83 84 /* fields for tr_rflags (forwarding error codes) */ 85 #define TR_NO_ERR 0 86 #define TR_WRONG_IF 1 87 #define TR_PRUNED 2 88 #define TR_OPRUNED 3 89 #define TR_SCOPED 4 90 #define TR_NO_RTE 5 91 #define TR_NO_FWD 7 92 #define TR_NO_SPACE 0x81 93 #define TR_OLD_ROUTER 0x82 94 95 /* fields for tr_rproto (routing protocol) */ 96 #define TR_PROTO_DVMRP 1 97 #define TR_PROTO_MOSPF 2 98 #define TR_PROTO_PIM 3 99 #define TR_PROTO_CBT 4 100 101 /* igmpv3 report types */ 102 static struct tok igmpv3report2str[] = { 103 { 1, "is_in" }, 104 { 2, "is_ex" }, 105 { 3, "to_in" }, 106 { 4, "to_ex" }, 107 { 5, "allow" }, 108 { 6, "block" }, 109 { 0, NULL } 110 }; 111 112 static void 113 print_mtrace(register const u_char *bp, register u_int len) 114 { 115 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 116 117 printf("mtrace %lu: %s to %s reply-to %s", 118 (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), 119 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 120 ipaddr_string(&tr->tr_raddr)); 121 if (IN_CLASSD(ntohl(tr->tr_raddr))) 122 printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); 123 } 124 125 static void 126 print_mresp(register const u_char *bp, register u_int len) 127 { 128 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 129 130 printf("mresp %lu: %s to %s reply-to %s", 131 (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), 132 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 133 ipaddr_string(&tr->tr_raddr)); 134 if (IN_CLASSD(ntohl(tr->tr_raddr))) 135 printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); 136 } 137 138 static void 139 print_igmpv3_report(register const u_char *bp, register u_int len) 140 { 141 u_int group, nsrcs, ngroups; 142 register u_int i, j; 143 144 /* Minimum len is 16, and should be a multiple of 4 */ 145 if (len < 16 || len & 0x03) { 146 (void)printf(" [invalid len %d]", len); 147 return; 148 } 149 TCHECK2(bp[6], 2); 150 ngroups = EXTRACT_16BITS(&bp[6]); 151 (void)printf(", %d group record(s)", ngroups); 152 if (vflag > 0) { 153 /* Print the group records */ 154 group = 8; 155 for (i=0; i<ngroups; i++) { 156 if (len < group+8) { 157 (void)printf(" [invalid number of groups]"); 158 return; 159 } 160 TCHECK2(bp[group+4], 4); 161 (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4])); 162 (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 163 bp[group])); 164 nsrcs = EXTRACT_16BITS(&bp[group+2]); 165 /* Check the number of sources and print them */ 166 if (len < group+8+(nsrcs<<2)) { 167 (void)printf(" [invalid number of sources %d]", nsrcs); 168 return; 169 } 170 if (vflag == 1) 171 (void)printf(", %d source(s)", nsrcs); 172 else { 173 /* Print the sources */ 174 (void)printf(" {"); 175 for (j=0; j<nsrcs; j++) { 176 TCHECK2(bp[group+8+(j<<2)], 4); 177 (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)])); 178 } 179 (void)printf(" }"); 180 } 181 /* Next group record */ 182 group += 8 + (nsrcs << 2); 183 (void)printf("]"); 184 } 185 } 186 return; 187 trunc: 188 (void)printf("[|igmp]"); 189 return; 190 } 191 192 static void 193 print_igmpv3_query(register const u_char *bp, register u_int len) 194 { 195 u_int mrc; 196 int mrt; 197 u_int nsrcs; 198 register u_int i; 199 200 (void)printf(" v3"); 201 /* Minimum len is 12, and should be a multiple of 4 */ 202 if (len < 12 || len & 0x03) { 203 (void)printf(" [invalid len %d]", len); 204 return; 205 } 206 mrc = bp[1]; 207 if (mrc < 128) { 208 mrt = mrc; 209 } else { 210 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 211 } 212 if (mrc != 100) { 213 (void)printf(" [max resp time "); 214 relts_print(mrt); 215 (void)printf("]"); 216 } 217 TCHECK2(bp[4], 4); 218 if (EXTRACT_32BITS(&bp[4]) == 0) 219 return; 220 (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); 221 TCHECK2(bp[10], 2); 222 nsrcs = EXTRACT_16BITS(&bp[10]); 223 if (nsrcs > 0) { 224 if (len < 12 + (nsrcs << 2)) 225 (void)printf(" [invalid number of sources]"); 226 else if (vflag > 1) { 227 (void)printf(" {"); 228 for (i=0; i<nsrcs; i++) { 229 TCHECK2(bp[12+(i<<2)], 4); 230 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); 231 } 232 (void)printf(" }"); 233 } else 234 (void)printf(", %d source(s)", nsrcs); 235 } 236 (void)printf("]"); 237 return; 238 trunc: 239 (void)printf("[|igmp]"); 240 return; 241 } 242 243 void 244 igmp_print(register const u_char *bp, register u_int len) 245 { 246 if (qflag) { 247 (void)printf("igmp"); 248 return; 249 } 250 251 TCHECK2(bp[0], 8); 252 switch (bp[0]) { 253 case 0x11: 254 (void)printf("igmp query"); 255 if (len >= 12) 256 print_igmpv3_query(bp, len); 257 else { 258 if (bp[1]) { 259 (void)printf(" v2"); 260 if (bp[1] != 100) 261 (void)printf(" [max resp time %d]", bp[1]); 262 } else 263 (void)printf(" v1"); 264 if (EXTRACT_32BITS(&bp[4])) 265 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); 266 if (len != 8) 267 (void)printf(" [len %d]", len); 268 } 269 break; 270 case 0x12: 271 (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); 272 if (len != 8) 273 (void)printf(" [len %d]", len); 274 break; 275 case 0x16: 276 (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); 277 break; 278 case 0x22: 279 (void)printf("igmp v3 report"); 280 print_igmpv3_report(bp, len); 281 break; 282 case 0x17: 283 (void)printf("igmp leave %s", ipaddr_string(&bp[4])); 284 break; 285 case 0x13: 286 (void)printf("igmp dvmrp"); 287 if (len < 8) 288 (void)printf(" [len %d]", len); 289 else 290 dvmrp_print(bp, len); 291 break; 292 case 0x14: 293 (void)printf("igmp pimv1"); 294 pimv1_print(bp, len); 295 break; 296 case 0x1e: 297 print_mresp(bp, len); 298 break; 299 case 0x1f: 300 print_mtrace(bp, len); 301 break; 302 default: 303 (void)printf("igmp-%d", bp[0]); 304 break; 305 } 306 307 if (vflag && TTEST2(bp[0], len)) { 308 /* Check the IGMP checksum */ 309 if (in_cksum((const u_short*)bp, len, 0)) 310 printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); 311 } 312 return; 313 trunc: 314 fputs("[|igmp]", stdout); 315 } 316