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 2001/09/17 21:58:02 fenner 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 #include <netinet/in_systm.h> 36 #include <netinet/ip.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_int tr_src; /* traceroute source */ 56 u_int tr_dst; /* traceroute destination */ 57 u_int tr_raddr; /* traceroute response address */ 58 u_int 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_int tr_qarr; /* query arrival time */ 70 u_int tr_inaddr; /* incoming interface address */ 71 u_int tr_outaddr; /* outgoing interface address */ 72 u_int tr_rmtaddr; /* parent address in source tree */ 73 u_int tr_vifin; /* input packet count on interface */ 74 u_int tr_vifout; /* output packet count on interface */ 75 u_int tr_pktcnt; /* total incoming packets for src-grp */ 76 u_char tr_rproto; /* routing proto deployed on router */ 77 u_char tr_fttl; /* ttl required to forward on outvif */ 78 u_char tr_smask; /* subnet mask for src addr */ 79 u_char 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 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 printf("mtrace %lu: %s to %s reply-to %s", 120 (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), 121 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 122 ipaddr_string(&tr->tr_raddr)); 123 if (IN_CLASSD(ntohl(tr->tr_raddr))) 124 printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); 125 } 126 127 static void 128 print_mresp(register const u_char *bp, register u_int len) 129 { 130 register const struct tr_query *tr = (const struct tr_query *)(bp + 8); 131 132 printf("mresp %lu: %s to %s reply-to %s", 133 (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), 134 ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), 135 ipaddr_string(&tr->tr_raddr)); 136 if (IN_CLASSD(ntohl(tr->tr_raddr))) 137 printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); 138 } 139 140 static void 141 print_igmpv3_report(register const u_char *bp, register u_int len) 142 { 143 u_int group, nsrcs, ngroups; 144 register u_int i, j; 145 146 /* Minimum len is 16, and should be a multiple of 4 */ 147 if (len < 16 || len & 0x03) { 148 (void)printf(" [invalid len %d]", len); 149 return; 150 } 151 TCHECK2(bp[6], 2); 152 ngroups = EXTRACT_16BITS(&bp[6]); 153 (void)printf(", %d group record(s)", ngroups); 154 if (vflag > 0) { 155 /* Print the group records */ 156 group = 8; 157 for (i=0; i<ngroups; i++) { 158 if (len < group+8) { 159 (void)printf(" [invalid number of groups]"); 160 return; 161 } 162 TCHECK2(bp[group+4], 4); 163 (void)printf(" [gaddr %s", ipaddr_string(&bp[group+4])); 164 (void)printf(" %s", tok2str(igmpv3report2str, " [v3-report-#%d]", 165 bp[group])); 166 nsrcs = EXTRACT_16BITS(&bp[group+2]); 167 /* Check the number of sources and print them */ 168 if (len < group+8+(nsrcs<<2)) { 169 (void)printf(" [invalid number of sources %d]", nsrcs); 170 return; 171 } 172 if (vflag == 1) 173 (void)printf(", %d source(s)", nsrcs); 174 else { 175 /* Print the sources */ 176 (void)printf(" {"); 177 for (j=0; j<nsrcs; j++) { 178 TCHECK2(bp[group+8+(j<<2)], 4); 179 (void)printf(" %s", ipaddr_string(&bp[group+8+(j<<2)])); 180 } 181 (void)printf(" }"); 182 } 183 /* Next group record */ 184 group += 8 + (nsrcs << 2); 185 (void)printf("]"); 186 } 187 } 188 return; 189 trunc: 190 (void)printf("[|igmp]"); 191 return; 192 } 193 194 static void 195 print_igmpv3_query(register const u_char *bp, register u_int len) 196 { 197 u_int mrc; 198 int mrt; 199 u_int nsrcs; 200 register u_int i; 201 202 (void)printf(" v3"); 203 /* Minimum len is 12, and should be a multiple of 4 */ 204 if (len < 12 || len & 0x03) { 205 (void)printf(" [invalid len %d]", len); 206 return; 207 } 208 mrc = bp[1]; 209 if (mrc < 128) { 210 mrt = mrc; 211 } else { 212 mrt = ((mrc & 0x0f) | 0x10) << (((mrc & 0x70) >> 4) + 3); 213 } 214 if (mrc != 100) { 215 (void)printf(" [max resp time "); 216 relts_print(mrt); 217 (void)printf("]"); 218 } 219 TCHECK2(bp[4], 4); 220 if (EXTRACT_32BITS(&bp[4]) == 0) 221 return; 222 (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); 223 TCHECK2(bp[10], 2); 224 nsrcs = EXTRACT_16BITS(&bp[10]); 225 if (nsrcs > 0) { 226 if (len < 12 + (nsrcs << 2)) 227 (void)printf(" [invalid number of sources]"); 228 else if (vflag > 1) { 229 (void)printf(" {"); 230 for (i=0; i<nsrcs; i++) { 231 TCHECK2(bp[12+(i<<2)], 4); 232 (void)printf(" %s", ipaddr_string(&bp[12+(i<<2)])); 233 } 234 (void)printf(" }"); 235 } else 236 (void)printf(", %d source(s)", nsrcs); 237 } 238 (void)printf("]"); 239 return; 240 trunc: 241 (void)printf("[|igmp]"); 242 return; 243 } 244 245 void 246 igmp_print(register const u_char *bp, register u_int len) 247 { 248 if (qflag) { 249 (void)printf("igmp"); 250 return; 251 } 252 253 TCHECK2(bp[0], 8); 254 switch (bp[0]) { 255 case 0x11: 256 (void)printf("igmp query"); 257 if (len >= 12) 258 print_igmpv3_query(bp, len); 259 else { 260 if (bp[1]) { 261 (void)printf(" v2"); 262 if (bp[1] != 100) 263 (void)printf(" [max resp time %d]", bp[1]); 264 } else 265 (void)printf(" v1"); 266 if (EXTRACT_32BITS(&bp[4])) 267 (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); 268 if (len != 8) 269 (void)printf(" [len %d]", len); 270 } 271 break; 272 case 0x12: 273 (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); 274 if (len != 8) 275 (void)printf(" [len %d]", len); 276 break; 277 case 0x16: 278 (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); 279 break; 280 case 0x22: 281 (void)printf("igmp v3 report"); 282 print_igmpv3_report(bp, len); 283 break; 284 case 0x17: 285 (void)printf("igmp leave %s", ipaddr_string(&bp[4])); 286 break; 287 case 0x13: 288 (void)printf("igmp dvmrp"); 289 if (len < 8) 290 (void)printf(" [len %d]", len); 291 else 292 dvmrp_print(bp, len); 293 break; 294 case 0x14: 295 (void)printf("igmp pimv1"); 296 pimv1_print(bp, len); 297 break; 298 case 0x1e: 299 print_mresp(bp, len); 300 break; 301 case 0x1f: 302 print_mtrace(bp, len); 303 break; 304 default: 305 (void)printf("igmp-%d", bp[0]); 306 break; 307 } 308 309 if (vflag && TTEST2(bp[0], len)) { 310 /* Check the IGMP checksum */ 311 if (in_cksum((const u_short*)bp, len, 0)) 312 printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); 313 } 314 return; 315 trunc: 316 fputs("[|igmp]", stdout); 317 } 318