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: /home/cvs/src/usr.sbin/tcpdump/print-icmp.c,v 1.7 1998/07/13 22:13:47 deraadt Exp $ (LBL)"; 25 #endif 26 27 #include <sys/param.h> 28 #include <sys/time.h> 29 #include <sys/socket.h> 30 31 #ifdef __STDC__ 32 struct mbuf; 33 struct rtentry; 34 #endif 35 #include <net/if.h> 36 37 #include <netinet/in.h> 38 #include <netinet/if_ether.h> 39 #include <netinet/in_systm.h> 40 #include <netinet/ip.h> 41 #include <netinet/ip_icmp.h> 42 #include <netinet/ip_var.h> 43 #include <netinet/udp.h> 44 #include <netinet/udp_var.h> 45 #include <netinet/tcp.h> 46 #include <netinet/tcpip.h> 47 48 #include <stdio.h> 49 #include <string.h> 50 51 #include "interface.h" 52 #include "addrtoname.h" 53 #include "extract.h" /* must come after interface.h */ 54 55 /* rfc1700 */ 56 #ifndef ICMP_UNREACH_NET_UNKNOWN 57 #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */ 58 #endif 59 #ifndef ICMP_UNREACH_HOST_UNKNOWN 60 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */ 61 #endif 62 #ifndef ICMP_UNREACH_ISOLATED 63 #define ICMP_UNREACH_ISOLATED 8 /* source host isolated */ 64 #endif 65 #ifndef ICMP_UNREACH_NET_PROHIB 66 #define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */ 67 #endif 68 #ifndef ICMP_UNREACH_HOST_PROHIB 69 #define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */ 70 #endif 71 #ifndef ICMP_UNREACH_TOSNET 72 #define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */ 73 #endif 74 #ifndef ICMP_UNREACH_TOSHOST 75 #define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */ 76 #endif 77 78 /* rfc1716 */ 79 #ifndef ICMP_UNREACH_FILTER_PROHIB 80 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */ 81 #endif 82 #ifndef ICMP_UNREACH_HOST_PRECEDENCE 83 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */ 84 #endif 85 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF 86 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */ 87 #endif 88 89 /* rfc1256 */ 90 #ifndef ICMP_ROUTERADVERT 91 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 92 #endif 93 #ifndef ICMP_ROUTERSOLICIT 94 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 95 #endif 96 97 /* Most of the icmp types */ 98 static struct tok icmp2str[] = { 99 { ICMP_ECHOREPLY, "echo reply" }, 100 { ICMP_SOURCEQUENCH, "source quench" }, 101 { ICMP_ECHO, "echo request" }, 102 { ICMP_ROUTERSOLICIT, "router solicitation" }, 103 { ICMP_TSTAMP, "time stamp request" }, 104 { ICMP_TSTAMPREPLY, "time stamp reply" }, 105 { ICMP_IREQ, "information request" }, 106 { ICMP_IREQREPLY, "information reply" }, 107 { ICMP_MASKREQ, "address mask request" }, 108 { 0, NULL } 109 }; 110 111 /* Formats for most of the ICMP_UNREACH codes */ 112 static struct tok unreach2str[] = { 113 { ICMP_UNREACH_NET, "net %s unreachable" }, 114 { ICMP_UNREACH_HOST, "host %s unreachable" }, 115 { ICMP_UNREACH_SRCFAIL, 116 "%s unreachable - source route failed" }, 117 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" }, 118 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" }, 119 { ICMP_UNREACH_ISOLATED, 120 "%s unreachable - source host isolated" }, 121 { ICMP_UNREACH_NET_PROHIB, 122 "net %s unreachable - admin prohibited" }, 123 { ICMP_UNREACH_HOST_PROHIB, 124 "host %s unreachable - admin prohibited" }, 125 { ICMP_UNREACH_TOSNET, 126 "net %s unreachable - tos prohibited" }, 127 { ICMP_UNREACH_TOSHOST, 128 "host %s unreachable - tos prohibited" }, 129 { ICMP_UNREACH_FILTER_PROHIB, 130 "host %s unreachable - admin prohibited filter" }, 131 { ICMP_UNREACH_HOST_PRECEDENCE, 132 "host %s unreachable - host precedence violation" }, 133 { ICMP_UNREACH_PRECEDENCE_CUTOFF, 134 "host %s unreachable - precedence cutoff" }, 135 { 0, NULL } 136 }; 137 138 /* Formats for the ICMP_REDIRECT codes */ 139 static struct tok type2str[] = { 140 { ICMP_REDIRECT_NET, "redirect %s to net %s" }, 141 { ICMP_REDIRECT_HOST, "redirect %s to host %s" }, 142 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" }, 143 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to net %s" }, 144 { 0, NULL } 145 }; 146 147 /* rfc1191 */ 148 struct mtu_discovery { 149 short unused; 150 short nexthopmtu; 151 }; 152 153 /* rfc1256 */ 154 struct ih_rdiscovery { 155 u_char ird_addrnum; 156 u_char ird_addrsiz; 157 u_short ird_lifetime; 158 }; 159 160 struct id_rdiscovery { 161 u_int32_t ird_addr; 162 u_int32_t ird_pref; 163 }; 164 165 void 166 icmp_print(register const u_char *bp, register const u_char *bp2) 167 { 168 register char *cp; 169 register const struct icmp *dp; 170 register const struct ip *ip; 171 register const char *str, *fmt; 172 register const struct ip *oip; 173 register const struct udphdr *ouh; 174 register u_int hlen, dport, mtu; 175 char buf[MAXHOSTNAMELEN+256]; 176 177 dp = (struct icmp *)bp; 178 ip = (struct ip *)bp2; 179 str = buf; 180 181 (void)printf("%s > %s: ", 182 ipaddr_string(&ip->ip_src), 183 ipaddr_string(&ip->ip_dst)); 184 185 TCHECK(dp->icmp_code); 186 switch (dp->icmp_type) { 187 188 case ICMP_UNREACH: 189 TCHECK(dp->icmp_ip.ip_dst); 190 switch (dp->icmp_code) { 191 192 case ICMP_UNREACH_PROTOCOL: 193 TCHECK(dp->icmp_ip.ip_p); 194 (void)snprintf(buf, sizeof buf, 195 "%s protocol %d unreachable", 196 ipaddr_string(&dp->icmp_ip.ip_dst), 197 dp->icmp_ip.ip_p); 198 break; 199 200 case ICMP_UNREACH_PORT: 201 TCHECK(dp->icmp_ip.ip_p); 202 oip = &dp->icmp_ip; 203 hlen = oip->ip_hl * 4; 204 ouh = (struct udphdr *)(((u_char *)oip) + hlen); 205 dport = ntohs(ouh->uh_dport); 206 switch (oip->ip_p) { 207 208 case IPPROTO_TCP: 209 (void)snprintf(buf, sizeof buf, 210 "%s tcp port %s unreachable", 211 ipaddr_string(&oip->ip_dst), 212 tcpport_string(dport)); 213 break; 214 215 case IPPROTO_UDP: 216 (void)snprintf(buf, sizeof buf, 217 "%s udp port %s unreachable", 218 ipaddr_string(&oip->ip_dst), 219 udpport_string(dport)); 220 break; 221 222 default: 223 (void)snprintf(buf, sizeof buf, 224 "%s protocol %d port %d unreachable", 225 ipaddr_string(&oip->ip_dst), 226 oip->ip_p, dport); 227 break; 228 } 229 break; 230 231 case ICMP_UNREACH_NEEDFRAG: 232 { 233 register const struct mtu_discovery *mp; 234 235 mp = (struct mtu_discovery *)&dp->icmp_void; 236 mtu = EXTRACT_16BITS(&mp->nexthopmtu); 237 if (mtu) 238 (void)snprintf(buf, sizeof buf, 239 "%s unreachable - need to frag (mtu %d)", 240 ipaddr_string(&dp->icmp_ip.ip_dst), mtu); 241 else 242 (void)snprintf(buf, sizeof buf, 243 "%s unreachable - need to frag", 244 ipaddr_string(&dp->icmp_ip.ip_dst)); 245 } 246 break; 247 248 default: 249 fmt = tok2str(unreach2str, "#%d %%s unreachable", 250 dp->icmp_code); 251 (void)snprintf(buf, sizeof buf, fmt, 252 ipaddr_string(&dp->icmp_ip.ip_dst)); 253 break; 254 } 255 break; 256 257 case ICMP_REDIRECT: 258 TCHECK(dp->icmp_ip.ip_dst); 259 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s", 260 dp->icmp_code); 261 (void)snprintf(buf, sizeof buf, fmt, 262 ipaddr_string(&dp->icmp_ip.ip_dst), 263 ipaddr_string(&dp->icmp_gwaddr)); 264 break; 265 266 case ICMP_ROUTERADVERT: 267 { 268 register const struct ih_rdiscovery *ihp; 269 register const struct id_rdiscovery *idp; 270 u_int lifetime, num, size; 271 272 (void)strncpy(buf, "router advertisement", sizeof buf-1); 273 buf[sizeof buf-1] = '\0'; 274 cp = buf + strlen(buf); 275 276 ihp = (struct ih_rdiscovery *)&dp->icmp_void; 277 TCHECK(*ihp); 278 (void)strcpy(cp, " lifetime "); 279 cp = buf + strlen(buf); 280 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime); 281 if (lifetime < 60) 282 (void)snprintf(cp, buf + sizeof buf - cp, "%u", lifetime); 283 else if (lifetime < 60 * 60) 284 (void)snprintf(cp, buf + sizeof buf - cp, "%u:%02u", 285 lifetime / 60, lifetime % 60); 286 else 287 (void)snprintf(cp, buf + sizeof buf - cp, "%u:%02u:%02u", 288 lifetime / 3600, 289 (lifetime % 3600) / 60, 290 lifetime % 60); 291 cp = buf + strlen(buf); 292 293 num = ihp->ird_addrnum; 294 (void)snprintf(cp, buf + sizeof buf - cp, " %d:", num); 295 cp = buf + strlen(buf); 296 297 size = ihp->ird_addrsiz; 298 if (size != 2) { 299 (void)snprintf(cp, buf - sizeof buf - cp, 300 " [size %d]", size); 301 break; 302 } 303 idp = (struct id_rdiscovery *)&dp->icmp_data; 304 while (num-- > 0) { 305 TCHECK(*idp); 306 (void)snprintf(cp, buf + sizeof buf - cp, " {%s %u}", 307 ipaddr_string(&idp->ird_addr), 308 EXTRACT_32BITS(&idp->ird_pref)); 309 cp = buf + strlen(buf); 310 } 311 } 312 break; 313 314 case ICMP_TIMXCEED: 315 TCHECK(dp->icmp_ip.ip_dst); 316 switch (dp->icmp_code) { 317 318 case ICMP_TIMXCEED_INTRANS: 319 str = "time exceeded in-transit"; 320 break; 321 322 case ICMP_TIMXCEED_REASS: 323 str = "ip reassembly time exceeded"; 324 break; 325 326 default: 327 (void)snprintf(buf, sizeof buf, 328 "time exceeded-#%d", dp->icmp_code); 329 break; 330 } 331 break; 332 333 case ICMP_PARAMPROB: 334 if (dp->icmp_code) 335 (void)snprintf(buf, sizeof buf, 336 "parameter problem - code %d", 337 dp->icmp_code); 338 else { 339 TCHECK(dp->icmp_pptr); 340 (void)snprintf(buf, sizeof buf, 341 "parameter problem - octet %d", 342 dp->icmp_pptr); 343 } 344 break; 345 346 case ICMP_MASKREPLY: 347 TCHECK(dp->icmp_mask); 348 (void)snprintf(buf, sizeof buf, "address mask is 0x%08x", 349 (u_int32_t)ntohl(dp->icmp_mask)); 350 break; 351 352 default: 353 str = tok2str(icmp2str, "type-#%d", dp->icmp_type); 354 break; 355 } 356 (void)printf("icmp: %s", str); 357 return; 358 trunc: 359 fputs("[|icmp]", stdout); 360 } 361