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 * $FreeBSD$ 22 */ 23 24 #define NETDISSECT_REWORKED 25 #ifdef HAVE_CONFIG_H 26 #include "config.h" 27 #endif 28 29 #include <tcpdump-stdinc.h> 30 31 #include <stdio.h> 32 #include <string.h> 33 34 #include "interface.h" 35 #include "addrtoname.h" 36 #include "extract.h" /* must come after interface.h */ 37 38 #include "ip.h" 39 #include "udp.h" 40 #include "ipproto.h" 41 #include "mpls.h" 42 43 /* 44 * Interface Control Message Protocol Definitions. 45 * Per RFC 792, September 1981. 46 */ 47 48 /* 49 * Structure of an icmp header. 50 */ 51 struct icmp { 52 uint8_t icmp_type; /* type of message, see below */ 53 uint8_t icmp_code; /* type sub code */ 54 uint16_t icmp_cksum; /* ones complement cksum of struct */ 55 union { 56 uint8_t ih_pptr; /* ICMP_PARAMPROB */ 57 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */ 58 struct ih_idseq { 59 uint16_t icd_id; 60 uint16_t icd_seq; 61 } ih_idseq; 62 uint32_t ih_void; 63 } icmp_hun; 64 #define icmp_pptr icmp_hun.ih_pptr 65 #define icmp_gwaddr icmp_hun.ih_gwaddr 66 #define icmp_id icmp_hun.ih_idseq.icd_id 67 #define icmp_seq icmp_hun.ih_idseq.icd_seq 68 #define icmp_void icmp_hun.ih_void 69 union { 70 struct id_ts { 71 uint32_t its_otime; 72 uint32_t its_rtime; 73 uint32_t its_ttime; 74 } id_ts; 75 struct id_ip { 76 struct ip idi_ip; 77 /* options and then 64 bits of data */ 78 } id_ip; 79 uint32_t id_mask; 80 uint8_t id_data[1]; 81 } icmp_dun; 82 #define icmp_otime icmp_dun.id_ts.its_otime 83 #define icmp_rtime icmp_dun.id_ts.its_rtime 84 #define icmp_ttime icmp_dun.id_ts.its_ttime 85 #define icmp_ip icmp_dun.id_ip.idi_ip 86 #define icmp_mask icmp_dun.id_mask 87 #define icmp_data icmp_dun.id_data 88 }; 89 90 #define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4) 91 #define ICMP_MPLS_EXT_VERSION 2 92 93 /* 94 * Lower bounds on packet lengths for various types. 95 * For the error advice packets must first insure that the 96 * packet is large enought to contain the returned ip header. 97 * Only then can we do the check to see if 64 bits of packet 98 * data have been returned, since we need to check the returned 99 * ip header length. 100 */ 101 #define ICMP_MINLEN 8 /* abs minimum */ 102 #define ICMP_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-internet-icmp-08 */ 103 #define ICMP_TSLEN (8 + 3 * sizeof (uint32_t)) /* timestamp */ 104 #define ICMP_MASKLEN 12 /* address mask */ 105 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */ 106 #define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8) 107 /* N.B.: must separately check that ip_hl >= 5 */ 108 109 /* 110 * Definition of type and code field values. 111 */ 112 #define ICMP_ECHOREPLY 0 /* echo reply */ 113 #define ICMP_UNREACH 3 /* dest unreachable, codes: */ 114 #define ICMP_UNREACH_NET 0 /* bad net */ 115 #define ICMP_UNREACH_HOST 1 /* bad host */ 116 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */ 117 #define ICMP_UNREACH_PORT 3 /* bad port */ 118 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */ 119 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */ 120 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */ 121 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */ 122 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */ 123 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */ 124 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */ 125 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */ 126 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */ 127 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */ 128 #define ICMP_REDIRECT 5 /* shorter route, codes: */ 129 #define ICMP_REDIRECT_NET 0 /* for network */ 130 #define ICMP_REDIRECT_HOST 1 /* for host */ 131 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */ 132 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */ 133 #define ICMP_ECHO 8 /* echo service */ 134 #define ICMP_ROUTERADVERT 9 /* router advertisement */ 135 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */ 136 #define ICMP_TIMXCEED 11 /* time exceeded, code: */ 137 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */ 138 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */ 139 #define ICMP_PARAMPROB 12 /* ip header bad */ 140 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */ 141 #define ICMP_TSTAMP 13 /* timestamp request */ 142 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */ 143 #define ICMP_IREQ 15 /* information request */ 144 #define ICMP_IREQREPLY 16 /* information reply */ 145 #define ICMP_MASKREQ 17 /* address mask request */ 146 #define ICMP_MASKREPLY 18 /* address mask reply */ 147 148 #define ICMP_MAXTYPE 18 149 150 #define ICMP_INFOTYPE(type) \ 151 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \ 152 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \ 153 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \ 154 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \ 155 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY) 156 #define ICMP_MPLS_EXT_TYPE(type) \ 157 ((type) == ICMP_UNREACH || \ 158 (type) == ICMP_TIMXCEED || \ 159 (type) == ICMP_PARAMPROB) 160 /* rfc1700 */ 161 #ifndef ICMP_UNREACH_NET_UNKNOWN 162 #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */ 163 #endif 164 #ifndef ICMP_UNREACH_HOST_UNKNOWN 165 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */ 166 #endif 167 #ifndef ICMP_UNREACH_ISOLATED 168 #define ICMP_UNREACH_ISOLATED 8 /* source host isolated */ 169 #endif 170 #ifndef ICMP_UNREACH_NET_PROHIB 171 #define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */ 172 #endif 173 #ifndef ICMP_UNREACH_HOST_PROHIB 174 #define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */ 175 #endif 176 #ifndef ICMP_UNREACH_TOSNET 177 #define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */ 178 #endif 179 #ifndef ICMP_UNREACH_TOSHOST 180 #define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */ 181 #endif 182 183 /* rfc1716 */ 184 #ifndef ICMP_UNREACH_FILTER_PROHIB 185 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */ 186 #endif 187 #ifndef ICMP_UNREACH_HOST_PRECEDENCE 188 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */ 189 #endif 190 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF 191 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */ 192 #endif 193 194 /* Most of the icmp types */ 195 static const struct tok icmp2str[] = { 196 { ICMP_ECHOREPLY, "echo reply" }, 197 { ICMP_SOURCEQUENCH, "source quench" }, 198 { ICMP_ECHO, "echo request" }, 199 { ICMP_ROUTERSOLICIT, "router solicitation" }, 200 { ICMP_TSTAMP, "time stamp request" }, 201 { ICMP_TSTAMPREPLY, "time stamp reply" }, 202 { ICMP_IREQ, "information request" }, 203 { ICMP_IREQREPLY, "information reply" }, 204 { ICMP_MASKREQ, "address mask request" }, 205 { 0, NULL } 206 }; 207 208 /* Formats for most of the ICMP_UNREACH codes */ 209 static const struct tok unreach2str[] = { 210 { ICMP_UNREACH_NET, "net %s unreachable" }, 211 { ICMP_UNREACH_HOST, "host %s unreachable" }, 212 { ICMP_UNREACH_SRCFAIL, 213 "%s unreachable - source route failed" }, 214 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" }, 215 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" }, 216 { ICMP_UNREACH_ISOLATED, 217 "%s unreachable - source host isolated" }, 218 { ICMP_UNREACH_NET_PROHIB, 219 "net %s unreachable - admin prohibited" }, 220 { ICMP_UNREACH_HOST_PROHIB, 221 "host %s unreachable - admin prohibited" }, 222 { ICMP_UNREACH_TOSNET, 223 "net %s unreachable - tos prohibited" }, 224 { ICMP_UNREACH_TOSHOST, 225 "host %s unreachable - tos prohibited" }, 226 { ICMP_UNREACH_FILTER_PROHIB, 227 "host %s unreachable - admin prohibited filter" }, 228 { ICMP_UNREACH_HOST_PRECEDENCE, 229 "host %s unreachable - host precedence violation" }, 230 { ICMP_UNREACH_PRECEDENCE_CUTOFF, 231 "host %s unreachable - precedence cutoff" }, 232 { 0, NULL } 233 }; 234 235 /* Formats for the ICMP_REDIRECT codes */ 236 static const struct tok type2str[] = { 237 { ICMP_REDIRECT_NET, "redirect %s to net %s" }, 238 { ICMP_REDIRECT_HOST, "redirect %s to host %s" }, 239 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" }, 240 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" }, 241 { 0, NULL } 242 }; 243 244 /* rfc1191 */ 245 struct mtu_discovery { 246 uint16_t unused; 247 uint16_t nexthopmtu; 248 }; 249 250 /* rfc1256 */ 251 struct ih_rdiscovery { 252 uint8_t ird_addrnum; 253 uint8_t ird_addrsiz; 254 uint16_t ird_lifetime; 255 }; 256 257 struct id_rdiscovery { 258 uint32_t ird_addr; 259 uint32_t ird_pref; 260 }; 261 262 /* 263 * draft-bonica-internet-icmp-08 264 * 265 * The Destination Unreachable, Time Exceeded 266 * and Parameter Problem messages are slighly changed as per 267 * the above draft. A new Length field gets added to give 268 * the caller an idea about the length of the piggypacked 269 * IP packet before the MPLS extension header starts. 270 * 271 * The Length field represents length of the padded "original datagram" 272 * field measured in 32-bit words. 273 * 274 * 0 1 2 3 275 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 276 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 277 * | Type | Code | Checksum | 278 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 279 * | unused | Length | unused | 280 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 281 * | Internet Header + leading octets of original datagram | 282 * | | 283 * | // | 284 * | | 285 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 286 */ 287 288 struct icmp_ext_t { 289 uint8_t icmp_type; 290 uint8_t icmp_code; 291 uint8_t icmp_checksum[2]; 292 uint8_t icmp_reserved; 293 uint8_t icmp_length; 294 uint8_t icmp_reserved2[2]; 295 uint8_t icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */ 296 uint8_t icmp_ext_version_res[2]; 297 uint8_t icmp_ext_checksum[2]; 298 uint8_t icmp_ext_data[1]; 299 }; 300 301 struct icmp_mpls_ext_object_header_t { 302 uint8_t length[2]; 303 uint8_t class_num; 304 uint8_t ctype; 305 }; 306 307 static const struct tok icmp_mpls_ext_obj_values[] = { 308 { 1, "MPLS Stack Entry" }, 309 { 2, "Extended Payload" }, 310 { 0, NULL} 311 }; 312 313 /* prototypes */ 314 const char *icmp_tstamp_print(u_int); 315 316 /* print the milliseconds since midnight UTC */ 317 const char * 318 icmp_tstamp_print(u_int tstamp) { 319 u_int msec,sec,min,hrs; 320 321 static char buf[64]; 322 323 msec = tstamp % 1000; 324 sec = tstamp / 1000; 325 min = sec / 60; sec -= min * 60; 326 hrs = min / 60; min -= hrs * 60; 327 snprintf(buf, sizeof(buf), "%02u:%02u:%02u.%03u",hrs,min,sec,msec); 328 return buf; 329 } 330 331 void 332 icmp_print(netdissect_options *ndo, const u_char *bp, u_int plen, const u_char *bp2, 333 int fragmented) 334 { 335 char *cp; 336 const struct icmp *dp; 337 const struct icmp_ext_t *ext_dp; 338 const struct ip *ip; 339 const char *str, *fmt; 340 const struct ip *oip; 341 const struct udphdr *ouh; 342 const uint8_t *obj_tptr; 343 uint32_t raw_label; 344 const u_char *snapend_save; 345 const struct icmp_mpls_ext_object_header_t *icmp_mpls_ext_object_header; 346 u_int hlen, dport, mtu, obj_tlen, obj_class_num, obj_ctype; 347 char buf[MAXHOSTNAMELEN + 100]; 348 struct cksum_vec vec[1]; 349 350 dp = (struct icmp *)bp; 351 ext_dp = (struct icmp_ext_t *)bp; 352 ip = (struct ip *)bp2; 353 str = buf; 354 355 ND_TCHECK(dp->icmp_code); 356 switch (dp->icmp_type) { 357 358 case ICMP_ECHO: 359 case ICMP_ECHOREPLY: 360 ND_TCHECK(dp->icmp_seq); 361 (void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u", 362 dp->icmp_type == ICMP_ECHO ? 363 "request" : "reply", 364 EXTRACT_16BITS(&dp->icmp_id), 365 EXTRACT_16BITS(&dp->icmp_seq)); 366 break; 367 368 case ICMP_UNREACH: 369 ND_TCHECK(dp->icmp_ip.ip_dst); 370 switch (dp->icmp_code) { 371 372 case ICMP_UNREACH_PROTOCOL: 373 ND_TCHECK(dp->icmp_ip.ip_p); 374 (void)snprintf(buf, sizeof(buf), 375 "%s protocol %d unreachable", 376 ipaddr_string(ndo, &dp->icmp_ip.ip_dst), 377 dp->icmp_ip.ip_p); 378 break; 379 380 case ICMP_UNREACH_PORT: 381 ND_TCHECK(dp->icmp_ip.ip_p); 382 oip = &dp->icmp_ip; 383 hlen = IP_HL(oip) * 4; 384 ouh = (struct udphdr *)(((u_char *)oip) + hlen); 385 ND_TCHECK(ouh->uh_dport); 386 dport = EXTRACT_16BITS(&ouh->uh_dport); 387 switch (oip->ip_p) { 388 389 case IPPROTO_TCP: 390 (void)snprintf(buf, sizeof(buf), 391 "%s tcp port %s unreachable", 392 ipaddr_string(ndo, &oip->ip_dst), 393 tcpport_string(dport)); 394 break; 395 396 case IPPROTO_UDP: 397 (void)snprintf(buf, sizeof(buf), 398 "%s udp port %s unreachable", 399 ipaddr_string(ndo, &oip->ip_dst), 400 udpport_string(dport)); 401 break; 402 403 default: 404 (void)snprintf(buf, sizeof(buf), 405 "%s protocol %d port %d unreachable", 406 ipaddr_string(ndo, &oip->ip_dst), 407 oip->ip_p, dport); 408 break; 409 } 410 break; 411 412 case ICMP_UNREACH_NEEDFRAG: 413 { 414 register const struct mtu_discovery *mp; 415 mp = (struct mtu_discovery *)(u_char *)&dp->icmp_void; 416 mtu = EXTRACT_16BITS(&mp->nexthopmtu); 417 if (mtu) { 418 (void)snprintf(buf, sizeof(buf), 419 "%s unreachable - need to frag (mtu %d)", 420 ipaddr_string(ndo, &dp->icmp_ip.ip_dst), mtu); 421 } else { 422 (void)snprintf(buf, sizeof(buf), 423 "%s unreachable - need to frag", 424 ipaddr_string(ndo, &dp->icmp_ip.ip_dst)); 425 } 426 } 427 break; 428 429 default: 430 fmt = tok2str(unreach2str, "#%d %%s unreachable", 431 dp->icmp_code); 432 (void)snprintf(buf, sizeof(buf), fmt, 433 ipaddr_string(ndo, &dp->icmp_ip.ip_dst)); 434 break; 435 } 436 break; 437 438 case ICMP_REDIRECT: 439 ND_TCHECK(dp->icmp_ip.ip_dst); 440 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s", 441 dp->icmp_code); 442 (void)snprintf(buf, sizeof(buf), fmt, 443 ipaddr_string(ndo, &dp->icmp_ip.ip_dst), 444 ipaddr_string(ndo, &dp->icmp_gwaddr)); 445 break; 446 447 case ICMP_ROUTERADVERT: 448 { 449 register const struct ih_rdiscovery *ihp; 450 register const struct id_rdiscovery *idp; 451 u_int lifetime, num, size; 452 453 (void)snprintf(buf, sizeof(buf), "router advertisement"); 454 cp = buf + strlen(buf); 455 456 ihp = (struct ih_rdiscovery *)&dp->icmp_void; 457 ND_TCHECK(*ihp); 458 (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf)); 459 cp = buf + strlen(buf); 460 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime); 461 if (lifetime < 60) { 462 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u", 463 lifetime); 464 } else if (lifetime < 60 * 60) { 465 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u", 466 lifetime / 60, lifetime % 60); 467 } else { 468 (void)snprintf(cp, sizeof(buf) - (cp - buf), 469 "%u:%02u:%02u", 470 lifetime / 3600, 471 (lifetime % 3600) / 60, 472 lifetime % 60); 473 } 474 cp = buf + strlen(buf); 475 476 num = ihp->ird_addrnum; 477 (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num); 478 cp = buf + strlen(buf); 479 480 size = ihp->ird_addrsiz; 481 if (size != 2) { 482 (void)snprintf(cp, sizeof(buf) - (cp - buf), 483 " [size %d]", size); 484 break; 485 } 486 idp = (struct id_rdiscovery *)&dp->icmp_data; 487 while (num-- > 0) { 488 ND_TCHECK(*idp); 489 (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}", 490 ipaddr_string(ndo, &idp->ird_addr), 491 EXTRACT_32BITS(&idp->ird_pref)); 492 cp = buf + strlen(buf); 493 ++idp; 494 } 495 } 496 break; 497 498 case ICMP_TIMXCEED: 499 ND_TCHECK(dp->icmp_ip.ip_dst); 500 switch (dp->icmp_code) { 501 502 case ICMP_TIMXCEED_INTRANS: 503 str = "time exceeded in-transit"; 504 break; 505 506 case ICMP_TIMXCEED_REASS: 507 str = "ip reassembly time exceeded"; 508 break; 509 510 default: 511 (void)snprintf(buf, sizeof(buf), "time exceeded-#%d", 512 dp->icmp_code); 513 break; 514 } 515 break; 516 517 case ICMP_PARAMPROB: 518 if (dp->icmp_code) 519 (void)snprintf(buf, sizeof(buf), 520 "parameter problem - code %d", dp->icmp_code); 521 else { 522 ND_TCHECK(dp->icmp_pptr); 523 (void)snprintf(buf, sizeof(buf), 524 "parameter problem - octet %d", dp->icmp_pptr); 525 } 526 break; 527 528 case ICMP_MASKREPLY: 529 ND_TCHECK(dp->icmp_mask); 530 (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x", 531 EXTRACT_32BITS(&dp->icmp_mask)); 532 break; 533 534 case ICMP_TSTAMP: 535 ND_TCHECK(dp->icmp_seq); 536 (void)snprintf(buf, sizeof(buf), 537 "time stamp query id %u seq %u", 538 EXTRACT_16BITS(&dp->icmp_id), 539 EXTRACT_16BITS(&dp->icmp_seq)); 540 break; 541 542 case ICMP_TSTAMPREPLY: 543 ND_TCHECK(dp->icmp_ttime); 544 (void)snprintf(buf, sizeof(buf), 545 "time stamp reply id %u seq %u: org %s", 546 EXTRACT_16BITS(&dp->icmp_id), 547 EXTRACT_16BITS(&dp->icmp_seq), 548 icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_otime))); 549 550 (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s", 551 icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_rtime))); 552 (void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s", 553 icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_ttime))); 554 break; 555 556 default: 557 str = tok2str(icmp2str, "type-#%d", dp->icmp_type); 558 break; 559 } 560 ND_PRINT((ndo, "ICMP %s, length %u", str, plen)); 561 if (ndo->ndo_vflag && !fragmented) { /* don't attempt checksumming if this is a frag */ 562 uint16_t sum, icmp_sum; 563 struct cksum_vec vec[1]; 564 if (ND_TTEST2(*bp, plen)) { 565 vec[0].ptr = (const uint8_t *)(void *)dp; 566 vec[0].len = plen; 567 sum = in_cksum(vec, 1); 568 if (sum != 0) { 569 icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum); 570 ND_PRINT((ndo, " (wrong icmp cksum %x (->%x)!)", 571 icmp_sum, 572 in_cksum_shouldbe(icmp_sum, sum))); 573 } 574 } 575 } 576 577 /* 578 * print the remnants of the IP packet. 579 * save the snaplength as this may get overidden in the IP printer. 580 */ 581 if (ndo->ndo_vflag >= 1 && !ICMP_INFOTYPE(dp->icmp_type)) { 582 bp += 8; 583 ND_PRINT((ndo, "\n\t")); 584 ip = (struct ip *)bp; 585 ndo->ndo_snaplen = ndo->ndo_snapend - bp; 586 snapend_save = ndo->ndo_snapend; 587 ip_print(ndo, bp, EXTRACT_16BITS(&ip->ip_len)); 588 ndo->ndo_snapend = snapend_save; 589 } 590 591 /* 592 * Attempt to decode the MPLS extensions only for some ICMP types. 593 */ 594 if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MPLS_EXT_TYPE(dp->icmp_type)) { 595 596 ND_TCHECK(*ext_dp); 597 598 /* 599 * Check first if the mpls extension header shows a non-zero length. 600 * If the length field is not set then silently verify the checksum 601 * to check if an extension header is present. This is expedient, 602 * however not all implementations set the length field proper. 603 */ 604 if (!ext_dp->icmp_length) { 605 vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res; 606 vec[0].len = plen - ICMP_EXTD_MINLEN; 607 if (in_cksum(vec, 1)) { 608 return; 609 } 610 } 611 612 ND_PRINT((ndo, "\n\tMPLS extension v%u", 613 ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)))); 614 615 /* 616 * Sanity checking of the header. 617 */ 618 if (ICMP_MPLS_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) != 619 ICMP_MPLS_EXT_VERSION) { 620 ND_PRINT((ndo, " packet not supported")); 621 return; 622 } 623 624 hlen = plen - ICMP_EXTD_MINLEN; 625 vec[0].ptr = (const uint8_t *)(void *)&ext_dp->icmp_ext_version_res; 626 vec[0].len = hlen; 627 ND_PRINT((ndo, ", checksum 0x%04x (%scorrect), length %u", 628 EXTRACT_16BITS(ext_dp->icmp_ext_checksum), 629 in_cksum(vec, 1) ? "in" : "", 630 hlen)); 631 632 hlen -= 4; /* subtract common header size */ 633 obj_tptr = (uint8_t *)ext_dp->icmp_ext_data; 634 635 while (hlen > sizeof(struct icmp_mpls_ext_object_header_t)) { 636 637 icmp_mpls_ext_object_header = (struct icmp_mpls_ext_object_header_t *)obj_tptr; 638 ND_TCHECK(*icmp_mpls_ext_object_header); 639 obj_tlen = EXTRACT_16BITS(icmp_mpls_ext_object_header->length); 640 obj_class_num = icmp_mpls_ext_object_header->class_num; 641 obj_ctype = icmp_mpls_ext_object_header->ctype; 642 obj_tptr += sizeof(struct icmp_mpls_ext_object_header_t); 643 644 ND_PRINT((ndo, "\n\t %s Object (%u), Class-Type: %u, length %u", 645 tok2str(icmp_mpls_ext_obj_values,"unknown",obj_class_num), 646 obj_class_num, 647 obj_ctype, 648 obj_tlen)); 649 650 hlen-=sizeof(struct icmp_mpls_ext_object_header_t); /* length field includes tlv header */ 651 652 /* infinite loop protection */ 653 if ((obj_class_num == 0) || 654 (obj_tlen < sizeof(struct icmp_mpls_ext_object_header_t))) { 655 return; 656 } 657 obj_tlen-=sizeof(struct icmp_mpls_ext_object_header_t); 658 659 switch (obj_class_num) { 660 case 1: 661 switch(obj_ctype) { 662 case 1: 663 ND_TCHECK2(*obj_tptr, 4); 664 raw_label = EXTRACT_32BITS(obj_tptr); 665 ND_PRINT((ndo, "\n\t label %u, exp %u", MPLS_LABEL(raw_label), MPLS_EXP(raw_label))); 666 if (MPLS_STACK(raw_label)) 667 ND_PRINT((ndo, ", [S]")); 668 ND_PRINT((ndo, ", ttl %u", MPLS_TTL(raw_label))); 669 break; 670 default: 671 print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen); 672 } 673 break; 674 675 /* 676 * FIXME those are the defined objects that lack a decoder 677 * you are welcome to contribute code ;-) 678 */ 679 case 2: 680 default: 681 print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen); 682 break; 683 } 684 if (hlen < obj_tlen) 685 break; 686 hlen -= obj_tlen; 687 obj_tptr += obj_tlen; 688 } 689 } 690 691 return; 692 trunc: 693 ND_PRINT((ndo, "[|icmp]")); 694 } 695 /* 696 * Local Variables: 697 * c-style: whitesmith 698 * c-basic-offset: 8 699 * End: 700 */ 701