print-ospf6.c revision 356341
1/* 2 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997 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 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu) 22 */ 23 24/* \summary: IPv6 Open Shortest Path First (OSPFv3) printer */ 25 26#ifdef HAVE_CONFIG_H 27#include "config.h" 28#endif 29 30#include <netdissect-stdinc.h> 31 32#include <string.h> 33 34#include "netdissect.h" 35#include "addrtoname.h" 36#include "extract.h" 37 38#include "ospf.h" 39 40#define OSPF_TYPE_HELLO 1 /* Hello */ 41#define OSPF_TYPE_DD 2 /* Database Description */ 42#define OSPF_TYPE_LS_REQ 3 /* Link State Request */ 43#define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */ 44#define OSPF_TYPE_LS_ACK 5 /* Link State Ack */ 45 46/* Options *_options */ 47#define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */ 48#define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */ 49#define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */ 50#define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */ 51#define OSPF6_OPTION_R 0x10 /* R bit: Router bit */ 52#define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */ 53/* The field is actually 24-bit (RFC5340 Section A.2). */ 54#define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */ 55#define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */ 56#define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */ 57 58 59/* db_flags */ 60#define OSPF6_DB_INIT 0x04 /* */ 61#define OSPF6_DB_MORE 0x02 62#define OSPF6_DB_MASTER 0x01 63#define OSPF6_DB_M6 0x10 /* IPv6 MTU */ 64 65/* ls_type */ 66#define LS_TYPE_ROUTER 1 /* router link */ 67#define LS_TYPE_NETWORK 2 /* network link */ 68#define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */ 69#define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */ 70#define LS_TYPE_ASE 5 /* ASE */ 71#define LS_TYPE_GROUP 6 /* Group membership */ 72#define LS_TYPE_NSSA 7 /* NSSA */ 73#define LS_TYPE_LINK 8 /* Link LSA */ 74#define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */ 75#define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */ 76#define LS_TYPE_GRACE 11 /* Grace LSA */ 77#define LS_TYPE_RI 12 /* Router information */ 78#define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */ 79#define LS_TYPE_L1VPN 14 /* L1VPN */ 80#define LS_TYPE_MASK 0x1fff 81 82#define LS_SCOPE_LINKLOCAL 0x0000 83#define LS_SCOPE_AREA 0x2000 84#define LS_SCOPE_AS 0x4000 85#define LS_SCOPE_MASK 0x6000 86#define LS_SCOPE_U 0x8000 87 88/* rla_link.link_type */ 89#define RLA_TYPE_ROUTER 1 /* point-to-point to another router */ 90#define RLA_TYPE_TRANSIT 2 /* connection to transit network */ 91#define RLA_TYPE_VIRTUAL 4 /* virtual link */ 92 93/* rla_flags */ 94#define RLA_FLAG_B 0x01 95#define RLA_FLAG_E 0x02 96#define RLA_FLAG_V 0x04 97#define RLA_FLAG_W 0x08 98#define RLA_FLAG_N 0x10 99 100/* lsa_prefix options */ 101#define LSA_PREFIX_OPT_NU 0x01 102#define LSA_PREFIX_OPT_LA 0x02 103#define LSA_PREFIX_OPT_MC 0x04 104#define LSA_PREFIX_OPT_P 0x08 105#define LSA_PREFIX_OPT_DN 0x10 106 107/* sla_tosmetric breakdown */ 108#define SLA_MASK_TOS 0x7f000000 109#define SLA_MASK_METRIC 0x00ffffff 110#define SLA_SHIFT_TOS 24 111 112/* asla_metric */ 113#define ASLA_FLAG_FWDADDR 0x02000000 114#define ASLA_FLAG_ROUTETAG 0x01000000 115#define ASLA_MASK_METRIC 0x00ffffff 116 117/* RFC6506 Section 4.1 */ 118#define OSPF6_AT_HDRLEN 16U 119#define OSPF6_AUTH_TYPE_HMAC 0x0001 120 121typedef uint32_t rtrid_t; 122 123/* link state advertisement header */ 124struct lsa6_hdr { 125 uint16_t ls_age; 126 uint16_t ls_type; 127 rtrid_t ls_stateid; 128 rtrid_t ls_router; 129 uint32_t ls_seq; 130 uint16_t ls_chksum; 131 uint16_t ls_length; 132}; 133 134/* Length of an IPv6 address, in bytes. */ 135#define IPV6_ADDR_LEN_BYTES (128/8) 136 137struct lsa6_prefix { 138 uint8_t lsa_p_len; 139 uint8_t lsa_p_opt; 140 uint16_t lsa_p_metric; 141 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */ 142}; 143 144/* link state advertisement */ 145struct lsa6 { 146 struct lsa6_hdr ls_hdr; 147 148 /* Link state types */ 149 union { 150 /* Router links advertisements */ 151 struct { 152 union { 153 uint8_t flg; 154 uint32_t opt; 155 } rla_flgandopt; 156#define rla_flags rla_flgandopt.flg 157#define rla_options rla_flgandopt.opt 158 struct rlalink6 { 159 uint8_t link_type; 160 uint8_t link_zero[1]; 161 uint16_t link_metric; 162 uint32_t link_ifid; 163 uint32_t link_nifid; 164 rtrid_t link_nrtid; 165 } rla_link[1]; /* may repeat */ 166 } un_rla; 167 168 /* Network links advertisements */ 169 struct { 170 uint32_t nla_options; 171 rtrid_t nla_router[1]; /* may repeat */ 172 } un_nla; 173 174 /* Inter Area Prefix LSA */ 175 struct { 176 uint32_t inter_ap_metric; 177 struct lsa6_prefix inter_ap_prefix[1]; 178 } un_inter_ap; 179 180 /* AS external links advertisements */ 181 struct { 182 uint32_t asla_metric; 183 struct lsa6_prefix asla_prefix[1]; 184 /* some optional fields follow */ 185 } un_asla; 186 187#if 0 188 /* Summary links advertisements */ 189 struct { 190 struct in_addr sla_mask; 191 uint32_t sla_tosmetric[1]; /* may repeat */ 192 } un_sla; 193 194 /* Multicast group membership */ 195 struct mcla { 196 uint32_t mcla_vtype; 197 struct in_addr mcla_vid; 198 } un_mcla[1]; 199#endif 200 201 /* Type 7 LSA */ 202 203 /* Link LSA */ 204 struct llsa { 205 union { 206 uint8_t pri; 207 uint32_t opt; 208 } llsa_priandopt; 209#define llsa_priority llsa_priandopt.pri 210#define llsa_options llsa_priandopt.opt 211 struct in6_addr llsa_lladdr; 212 uint32_t llsa_nprefix; 213 struct lsa6_prefix llsa_prefix[1]; 214 } un_llsa; 215 216 /* Intra-Area-Prefix */ 217 struct { 218 uint16_t intra_ap_nprefix; 219 uint16_t intra_ap_lstype; 220 rtrid_t intra_ap_lsid; 221 rtrid_t intra_ap_rtid; 222 struct lsa6_prefix intra_ap_prefix[1]; 223 } un_intra_ap; 224 } lsa_un; 225}; 226 227/* 228 * the main header 229 */ 230struct ospf6hdr { 231 uint8_t ospf6_version; 232 uint8_t ospf6_type; 233 uint16_t ospf6_len; 234 rtrid_t ospf6_routerid; 235 rtrid_t ospf6_areaid; 236 uint16_t ospf6_chksum; 237 uint8_t ospf6_instanceid; 238 uint8_t ospf6_rsvd; 239}; 240 241/* 242 * The OSPF6 header length is 16 bytes, regardless of how your compiler 243 * might choose to pad the above structure. 244 */ 245#define OSPF6HDR_LEN 16 246 247/* Hello packet */ 248struct hello6 { 249 uint32_t hello_ifid; 250 union { 251 uint8_t pri; 252 uint32_t opt; 253 } hello_priandopt; 254#define hello_priority hello_priandopt.pri 255#define hello_options hello_priandopt.opt 256 uint16_t hello_helloint; 257 uint16_t hello_deadint; 258 rtrid_t hello_dr; 259 rtrid_t hello_bdr; 260 rtrid_t hello_neighbor[1]; /* may repeat */ 261}; 262 263/* Database Description packet */ 264struct dd6 { 265 uint32_t db_options; 266 uint16_t db_mtu; 267 uint8_t db_mbz; 268 uint8_t db_flags; 269 uint32_t db_seq; 270 struct lsa6_hdr db_lshdr[1]; /* may repeat */ 271}; 272 273/* Link State Request */ 274struct lsr6 { 275 uint16_t ls_mbz; 276 uint16_t ls_type; 277 rtrid_t ls_stateid; 278 rtrid_t ls_router; 279}; 280 281/* Link State Update */ 282struct lsu6 { 283 uint32_t lsu_count; 284 struct lsa6 lsu_lsa[1]; /* may repeat */ 285}; 286 287static const char tstr[] = " [|ospf3]"; 288 289static const struct tok ospf6_option_values[] = { 290 { OSPF6_OPTION_V6, "V6" }, 291 { OSPF6_OPTION_E, "External" }, 292 { OSPF6_OPTION_MC, "Deprecated" }, 293 { OSPF6_OPTION_N, "NSSA" }, 294 { OSPF6_OPTION_R, "Router" }, 295 { OSPF6_OPTION_DC, "Demand Circuit" }, 296 { OSPF6_OPTION_AF, "AFs Support" }, 297 { OSPF6_OPTION_L, "LLS" }, 298 { OSPF6_OPTION_AT, "Authentication Trailer" }, 299 { 0, NULL } 300}; 301 302static const struct tok ospf6_rla_flag_values[] = { 303 { RLA_FLAG_B, "ABR" }, 304 { RLA_FLAG_E, "External" }, 305 { RLA_FLAG_V, "Virtual-Link Endpoint" }, 306 { RLA_FLAG_W, "Wildcard Receiver" }, 307 { RLA_FLAG_N, "NSSA Translator" }, 308 { 0, NULL } 309}; 310 311static const struct tok ospf6_asla_flag_values[] = { 312 { ASLA_FLAG_EXTERNAL, "External Type 2" }, 313 { ASLA_FLAG_FWDADDR, "Forwarding" }, 314 { ASLA_FLAG_ROUTETAG, "Tag" }, 315 { 0, NULL } 316}; 317 318static const struct tok ospf6_type_values[] = { 319 { OSPF_TYPE_HELLO, "Hello" }, 320 { OSPF_TYPE_DD, "Database Description" }, 321 { OSPF_TYPE_LS_REQ, "LS-Request" }, 322 { OSPF_TYPE_LS_UPDATE, "LS-Update" }, 323 { OSPF_TYPE_LS_ACK, "LS-Ack" }, 324 { 0, NULL } 325}; 326 327static const struct tok ospf6_lsa_values[] = { 328 { LS_TYPE_ROUTER, "Router" }, 329 { LS_TYPE_NETWORK, "Network" }, 330 { LS_TYPE_INTER_AP, "Inter-Area Prefix" }, 331 { LS_TYPE_INTER_AR, "Inter-Area Router" }, 332 { LS_TYPE_ASE, "External" }, 333 { LS_TYPE_GROUP, "Deprecated" }, 334 { LS_TYPE_NSSA, "NSSA" }, 335 { LS_TYPE_LINK, "Link" }, 336 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" }, 337 { LS_TYPE_INTRA_ATE, "Intra-Area TE" }, 338 { LS_TYPE_GRACE, "Grace" }, 339 { LS_TYPE_RI, "Router Information" }, 340 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" }, 341 { LS_TYPE_L1VPN, "Layer 1 VPN" }, 342 { 0, NULL } 343}; 344 345static const struct tok ospf6_ls_scope_values[] = { 346 { LS_SCOPE_LINKLOCAL, "Link Local" }, 347 { LS_SCOPE_AREA, "Area Local" }, 348 { LS_SCOPE_AS, "Domain Wide" }, 349 { 0, NULL } 350}; 351 352static const struct tok ospf6_dd_flag_values[] = { 353 { OSPF6_DB_INIT, "Init" }, 354 { OSPF6_DB_MORE, "More" }, 355 { OSPF6_DB_MASTER, "Master" }, 356 { OSPF6_DB_M6, "IPv6 MTU" }, 357 { 0, NULL } 358}; 359 360static const struct tok ospf6_lsa_prefix_option_values[] = { 361 { LSA_PREFIX_OPT_NU, "No Unicast" }, 362 { LSA_PREFIX_OPT_LA, "Local address" }, 363 { LSA_PREFIX_OPT_MC, "Deprecated" }, 364 { LSA_PREFIX_OPT_P, "Propagate" }, 365 { LSA_PREFIX_OPT_DN, "Down" }, 366 { 0, NULL } 367}; 368 369static const struct tok ospf6_auth_type_str[] = { 370 { OSPF6_AUTH_TYPE_HMAC, "HMAC" }, 371 { 0, NULL } 372}; 373 374static void 375ospf6_print_ls_type(netdissect_options *ndo, 376 register u_int ls_type, register const rtrid_t *ls_stateid) 377{ 378 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s", 379 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK), 380 ls_type & LS_TYPE_MASK, 381 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK), 382 ls_type &0x8000 ? ", transitive" : "", /* U-bit */ 383 ipaddr_string(ndo, ls_stateid))); 384} 385 386static int 387ospf6_print_lshdr(netdissect_options *ndo, 388 register const struct lsa6_hdr *lshp, const u_char *dataend) 389{ 390 if ((const u_char *)(lshp + 1) > dataend) 391 goto trunc; 392 ND_TCHECK(lshp->ls_length); /* last field of struct lsa6_hdr */ 393 394 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u", 395 ipaddr_string(ndo, &lshp->ls_router), 396 EXTRACT_32BITS(&lshp->ls_seq), 397 EXTRACT_16BITS(&lshp->ls_age), 398 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr))); 399 400 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid); 401 402 return (0); 403trunc: 404 return (1); 405} 406 407static int 408ospf6_print_lsaprefix(netdissect_options *ndo, 409 const uint8_t *tptr, u_int lsa_length) 410{ 411 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr; 412 u_int wordlen; 413 struct in6_addr prefix; 414 415 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES) 416 goto trunc; 417 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES; 418 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES); 419 wordlen = (lsapp->lsa_p_len + 31) / 32; 420 if (wordlen * 4 > sizeof(struct in6_addr)) { 421 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len)); 422 goto trunc; 423 } 424 if (lsa_length < wordlen * 4) 425 goto trunc; 426 lsa_length -= wordlen * 4; 427 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4); 428 memset(&prefix, 0, sizeof(prefix)); 429 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4); 430 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix), 431 lsapp->lsa_p_len)); 432 if (lsapp->lsa_p_opt) { 433 ND_PRINT((ndo, ", Options [%s]", 434 bittok2str(ospf6_lsa_prefix_option_values, 435 "none", lsapp->lsa_p_opt))); 436 } 437 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric))); 438 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4; 439 440trunc: 441 return -1; 442} 443 444 445/* 446 * Print a single link state advertisement. If truncated return 1, else 0. 447 */ 448static int 449ospf6_print_lsa(netdissect_options *ndo, 450 register const struct lsa6 *lsap, const u_char *dataend) 451{ 452 register const struct rlalink6 *rlp; 453#if 0 454 register const struct tos_metric *tosp; 455#endif 456 register const rtrid_t *ap; 457#if 0 458 register const struct aslametric *almp; 459 register const struct mcla *mcp; 460#endif 461 register const struct llsa *llsap; 462 register const struct lsa6_prefix *lsapp; 463#if 0 464 register const uint32_t *lp; 465#endif 466 register u_int prefixes; 467 register int bytelen; 468 register u_int length, lsa_length; 469 uint32_t flags32; 470 const uint8_t *tptr; 471 472 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend)) 473 return (1); 474 ND_TCHECK(lsap->ls_hdr.ls_length); 475 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length); 476 477 /* 478 * The LSA length includes the length of the header; 479 * it must have a value that's at least that length. 480 * If it does, find the length of what follows the 481 * header. 482 */ 483 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend) 484 return (1); 485 lsa_length = length - sizeof(struct lsa6_hdr); 486 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr); 487 488 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) { 489 case LS_TYPE_ROUTER | LS_SCOPE_AREA: 490 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options)) 491 return (1); 492 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options); 493 ND_TCHECK(lsap->lsa_un.un_rla.rla_options); 494 ND_PRINT((ndo, "\n\t Options [%s]", 495 bittok2str(ospf6_option_values, "none", 496 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)))); 497 ND_PRINT((ndo, ", RLA-Flags [%s]", 498 bittok2str(ospf6_rla_flag_values, "none", 499 lsap->lsa_un.un_rla.rla_flags))); 500 501 rlp = lsap->lsa_un.un_rla.rla_link; 502 while (lsa_length != 0) { 503 if (lsa_length < sizeof (*rlp)) 504 return (1); 505 lsa_length -= sizeof (*rlp); 506 ND_TCHECK(*rlp); 507 switch (rlp->link_type) { 508 509 case RLA_TYPE_VIRTUAL: 510 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s" 511 "\n\t Neighbor Interface-ID %s, Interface %s", 512 ipaddr_string(ndo, &rlp->link_nrtid), 513 ipaddr_string(ndo, &rlp->link_nifid), 514 ipaddr_string(ndo, &rlp->link_ifid))); 515 break; 516 517 case RLA_TYPE_ROUTER: 518 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s" 519 "\n\t Neighbor Interface-ID %s, Interface %s", 520 ipaddr_string(ndo, &rlp->link_nrtid), 521 ipaddr_string(ndo, &rlp->link_nifid), 522 ipaddr_string(ndo, &rlp->link_ifid))); 523 break; 524 525 case RLA_TYPE_TRANSIT: 526 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s" 527 "\n\t Neighbor Interface-ID %s, Interface %s", 528 ipaddr_string(ndo, &rlp->link_nrtid), 529 ipaddr_string(ndo, &rlp->link_nifid), 530 ipaddr_string(ndo, &rlp->link_ifid))); 531 break; 532 533 default: 534 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x", 535 rlp->link_type)); 536 return (0); 537 } 538 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric))); 539 rlp++; 540 } 541 break; 542 543 case LS_TYPE_NETWORK | LS_SCOPE_AREA: 544 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options)) 545 return (1); 546 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options); 547 ND_TCHECK(lsap->lsa_un.un_nla.nla_options); 548 ND_PRINT((ndo, "\n\t Options [%s]", 549 bittok2str(ospf6_option_values, "none", 550 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)))); 551 552 ND_PRINT((ndo, "\n\t Connected Routers:")); 553 ap = lsap->lsa_un.un_nla.nla_router; 554 while (lsa_length != 0) { 555 if (lsa_length < sizeof (*ap)) 556 return (1); 557 lsa_length -= sizeof (*ap); 558 ND_TCHECK(*ap); 559 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap))); 560 ++ap; 561 } 562 break; 563 564 case LS_TYPE_INTER_AP | LS_SCOPE_AREA: 565 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric)) 566 return (1); 567 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric); 568 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric); 569 ND_PRINT((ndo, ", metric %u", 570 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC)); 571 572 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix; 573 while (lsa_length != 0) { 574 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 575 if (bytelen < 0) 576 goto trunc; 577 lsa_length -= bytelen; 578 tptr += bytelen; 579 } 580 break; 581 582 case LS_TYPE_ASE | LS_SCOPE_AS: 583 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric)) 584 return (1); 585 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric); 586 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric); 587 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric); 588 ND_PRINT((ndo, "\n\t Flags [%s]", 589 bittok2str(ospf6_asla_flag_values, "none", flags32))); 590 ND_PRINT((ndo, " metric %u", 591 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) & 592 ASLA_MASK_METRIC)); 593 594 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix; 595 lsapp = (const struct lsa6_prefix *)tptr; 596 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 597 if (bytelen < 0) 598 goto trunc; 599 lsa_length -= bytelen; 600 tptr += bytelen; 601 602 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) { 603 const struct in6_addr *fwdaddr6; 604 605 fwdaddr6 = (const struct in6_addr *)tptr; 606 if (lsa_length < sizeof (*fwdaddr6)) 607 return (1); 608 lsa_length -= sizeof (*fwdaddr6); 609 ND_TCHECK(*fwdaddr6); 610 ND_PRINT((ndo, " forward %s", 611 ip6addr_string(ndo, fwdaddr6))); 612 tptr += sizeof(*fwdaddr6); 613 } 614 615 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) { 616 if (lsa_length < sizeof (uint32_t)) 617 return (1); 618 lsa_length -= sizeof (uint32_t); 619 ND_TCHECK(*(const uint32_t *)tptr); 620 ND_PRINT((ndo, " tag %s", 621 ipaddr_string(ndo, (const uint32_t *)tptr))); 622 tptr += sizeof(uint32_t); 623 } 624 625 if (lsapp->lsa_p_metric) { 626 if (lsa_length < sizeof (uint32_t)) 627 return (1); 628 lsa_length -= sizeof (uint32_t); 629 ND_TCHECK(*(const uint32_t *)tptr); 630 ND_PRINT((ndo, " RefLSID: %s", 631 ipaddr_string(ndo, (const uint32_t *)tptr))); 632 tptr += sizeof(uint32_t); 633 } 634 break; 635 636 case LS_TYPE_LINK: 637 /* Link LSA */ 638 llsap = &lsap->lsa_un.un_llsa; 639 if (lsa_length < sizeof (llsap->llsa_priandopt)) 640 return (1); 641 lsa_length -= sizeof (llsap->llsa_priandopt); 642 ND_TCHECK(llsap->llsa_priandopt); 643 ND_PRINT((ndo, "\n\t Options [%s]", 644 bittok2str(ospf6_option_values, "none", 645 EXTRACT_32BITS(&llsap->llsa_options)))); 646 647 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix)) 648 return (1); 649 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix); 650 ND_TCHECK(llsap->llsa_nprefix); 651 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix); 652 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:", 653 llsap->llsa_priority, 654 ip6addr_string(ndo, &llsap->llsa_lladdr), 655 prefixes)); 656 657 tptr = (const uint8_t *)llsap->llsa_prefix; 658 while (prefixes > 0) { 659 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 660 if (bytelen < 0) 661 goto trunc; 662 prefixes--; 663 lsa_length -= bytelen; 664 tptr += bytelen; 665 } 666 break; 667 668 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA: 669 /* Intra-Area-Prefix LSA */ 670 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid)) 671 return (1); 672 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid); 673 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid); 674 ospf6_print_ls_type(ndo, 675 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype), 676 &lsap->lsa_un.un_intra_ap.intra_ap_lsid); 677 678 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix)) 679 return (1); 680 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 681 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 682 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 683 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes)); 684 685 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix; 686 while (prefixes > 0) { 687 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 688 if (bytelen < 0) 689 goto trunc; 690 prefixes--; 691 lsa_length -= bytelen; 692 tptr += bytelen; 693 } 694 break; 695 696 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL: 697 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) { 698 return 1; 699 } 700 break; 701 702 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL: 703 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) { 704 return 1; 705 } 706 break; 707 708 default: 709 if(!print_unknown_data(ndo,tptr, 710 "\n\t ", 711 lsa_length)) { 712 return (1); 713 } 714 break; 715 } 716 717 return (0); 718trunc: 719 return (1); 720} 721 722static int 723ospf6_decode_v3(netdissect_options *ndo, 724 register const struct ospf6hdr *op, 725 register const u_char *dataend) 726{ 727 register const rtrid_t *ap; 728 register const struct lsr6 *lsrp; 729 register const struct lsa6_hdr *lshp; 730 register const struct lsa6 *lsap; 731 register int i; 732 733 switch (op->ospf6_type) { 734 735 case OSPF_TYPE_HELLO: { 736 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 737 738 ND_TCHECK_32BITS(&hellop->hello_options); 739 ND_PRINT((ndo, "\n\tOptions [%s]", 740 bittok2str(ospf6_option_values, "none", 741 EXTRACT_32BITS(&hellop->hello_options)))); 742 743 ND_TCHECK(hellop->hello_deadint); 744 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u", 745 EXTRACT_16BITS(&hellop->hello_helloint), 746 EXTRACT_16BITS(&hellop->hello_deadint), 747 ipaddr_string(ndo, &hellop->hello_ifid), 748 hellop->hello_priority)); 749 750 ND_TCHECK(hellop->hello_dr); 751 if (EXTRACT_32BITS(&hellop->hello_dr) != 0) 752 ND_PRINT((ndo, "\n\t Designated Router %s", 753 ipaddr_string(ndo, &hellop->hello_dr))); 754 ND_TCHECK(hellop->hello_bdr); 755 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0) 756 ND_PRINT((ndo, ", Backup Designated Router %s", 757 ipaddr_string(ndo, &hellop->hello_bdr))); 758 if (ndo->ndo_vflag > 1) { 759 ND_PRINT((ndo, "\n\t Neighbor List:")); 760 ap = hellop->hello_neighbor; 761 while ((const u_char *)ap < dataend) { 762 ND_TCHECK(*ap); 763 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap))); 764 ++ap; 765 } 766 } 767 break; /* HELLO */ 768 } 769 770 case OSPF_TYPE_DD: { 771 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 772 773 ND_TCHECK(ddp->db_options); 774 ND_PRINT((ndo, "\n\tOptions [%s]", 775 bittok2str(ospf6_option_values, "none", 776 EXTRACT_32BITS(&ddp->db_options)))); 777 ND_TCHECK(ddp->db_flags); 778 ND_PRINT((ndo, ", DD Flags [%s]", 779 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags))); 780 781 ND_TCHECK(ddp->db_seq); 782 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x", 783 EXTRACT_16BITS(&ddp->db_mtu), 784 EXTRACT_32BITS(&ddp->db_seq))); 785 if (ndo->ndo_vflag > 1) { 786 /* Print all the LS adv's */ 787 lshp = ddp->db_lshdr; 788 while ((const u_char *)lshp < dataend) { 789 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 790 goto trunc; 791 } 792 } 793 break; 794 } 795 796 case OSPF_TYPE_LS_REQ: 797 if (ndo->ndo_vflag > 1) { 798 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN); 799 while ((const u_char *)lsrp < dataend) { 800 ND_TCHECK(*lsrp); 801 ND_PRINT((ndo, "\n\t Advertising Router %s", 802 ipaddr_string(ndo, &lsrp->ls_router))); 803 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type), 804 &lsrp->ls_stateid); 805 ++lsrp; 806 } 807 } 808 break; 809 810 case OSPF_TYPE_LS_UPDATE: 811 if (ndo->ndo_vflag > 1) { 812 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN); 813 814 ND_TCHECK(lsup->lsu_count); 815 i = EXTRACT_32BITS(&lsup->lsu_count); 816 lsap = lsup->lsu_lsa; 817 while ((const u_char *)lsap < dataend && i--) { 818 if (ospf6_print_lsa(ndo, lsap, dataend)) 819 goto trunc; 820 lsap = (const struct lsa6 *)((const u_char *)lsap + 821 EXTRACT_16BITS(&lsap->ls_hdr.ls_length)); 822 } 823 } 824 break; 825 826 case OSPF_TYPE_LS_ACK: 827 if (ndo->ndo_vflag > 1) { 828 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN); 829 while ((const u_char *)lshp < dataend) { 830 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 831 goto trunc; 832 } 833 } 834 break; 835 836 default: 837 break; 838 } 839 return (0); 840trunc: 841 return (1); 842} 843 844/* RFC5613 Section 2.2 (w/o the TLVs) */ 845static int 846ospf6_print_lls(netdissect_options *ndo, 847 const u_char *cp, const u_int len) 848{ 849 uint16_t llsdatalen; 850 851 if (len == 0) 852 return 0; 853 if (len < OSPF_LLS_HDRLEN) 854 goto trunc; 855 /* Checksum */ 856 ND_TCHECK2(*cp, 2); 857 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp))); 858 cp += 2; 859 /* LLS Data Length */ 860 ND_TCHECK2(*cp, 2); 861 llsdatalen = EXTRACT_16BITS(cp); 862 ND_PRINT((ndo, ", Data Length %u", llsdatalen)); 863 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len) 864 goto trunc; 865 cp += 2; 866 /* LLS TLVs */ 867 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN); 868 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */ 869 870 return llsdatalen; 871trunc: 872 return -1; 873} 874 875/* RFC6506 Section 4.1 */ 876static int 877ospf6_decode_at(netdissect_options *ndo, 878 const u_char *cp, const u_int len) 879{ 880 uint16_t authdatalen; 881 882 if (len == 0) 883 return 0; 884 if (len < OSPF6_AT_HDRLEN) 885 goto trunc; 886 /* Authentication Type */ 887 ND_TCHECK2(*cp, 2); 888 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp)))); 889 cp += 2; 890 /* Auth Data Len */ 891 ND_TCHECK2(*cp, 2); 892 authdatalen = EXTRACT_16BITS(cp); 893 ND_PRINT((ndo, ", Length %u", authdatalen)); 894 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len) 895 goto trunc; 896 cp += 2; 897 /* Reserved */ 898 ND_TCHECK2(*cp, 2); 899 cp += 2; 900 /* Security Association ID */ 901 ND_TCHECK2(*cp, 2); 902 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp))); 903 cp += 2; 904 /* Cryptographic Sequence Number (High-Order 32 Bits) */ 905 ND_TCHECK2(*cp, 4); 906 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp))); 907 cp += 4; 908 /* Cryptographic Sequence Number (Low-Order 32 Bits) */ 909 ND_TCHECK2(*cp, 4); 910 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp))); 911 cp += 4; 912 /* Authentication Data */ 913 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN); 914 if (ndo->ndo_vflag > 1) 915 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN); 916 return 0; 917 918trunc: 919 return 1; 920} 921 922/* The trailing data may include LLS and/or AT data (in this specific order). 923 * LLS data may be present only in Hello and DBDesc packets with the L-bit set. 924 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in 925 * any other packet type, thus decode the AT data regardless of the AT-bit. 926 */ 927static int 928ospf6_decode_v3_trailer(netdissect_options *ndo, 929 const struct ospf6hdr *op, const u_char *cp, const unsigned len) 930{ 931 int llslen = 0; 932 int lls_hello = 0; 933 int lls_dd = 0; 934 935 if (op->ospf6_type == OSPF_TYPE_HELLO) { 936 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 937 ND_TCHECK(hellop->hello_options); 938 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L) 939 lls_hello = 1; 940 } else if (op->ospf6_type == OSPF_TYPE_DD) { 941 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 942 ND_TCHECK(ddp->db_options); 943 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L) 944 lls_dd = 1; 945 } 946 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0) 947 goto trunc; 948 return ospf6_decode_at(ndo, cp + llslen, len - llslen); 949 950trunc: 951 return 1; 952} 953 954void 955ospf6_print(netdissect_options *ndo, 956 register const u_char *bp, register u_int length) 957{ 958 register const struct ospf6hdr *op; 959 register const u_char *dataend; 960 register const char *cp; 961 uint16_t datalen; 962 963 op = (const struct ospf6hdr *)bp; 964 965 /* If the type is valid translate it, or just print the type */ 966 /* value. If it's not valid, say so and return */ 967 ND_TCHECK(op->ospf6_type); 968 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type); 969 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length)); 970 if (*cp == 'u') { 971 return; 972 } 973 974 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */ 975 return; 976 } 977 978 /* OSPFv3 data always comes first and optional trailing data may follow. */ 979 ND_TCHECK(op->ospf6_len); 980 datalen = EXTRACT_16BITS(&op->ospf6_len); 981 if (datalen > length) { 982 ND_PRINT((ndo, " [len %d]", datalen)); 983 return; 984 } 985 dataend = bp + datalen; 986 987 ND_TCHECK(op->ospf6_routerid); 988 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid))); 989 990 ND_TCHECK(op->ospf6_areaid); 991 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0) 992 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid))); 993 else 994 ND_PRINT((ndo, ", Backbone Area")); 995 ND_TCHECK(op->ospf6_instanceid); 996 if (op->ospf6_instanceid) 997 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid)); 998 999 /* Do rest according to version. */ 1000 switch (op->ospf6_version) { 1001 1002 case 3: 1003 /* ospf version 3 */ 1004 if (ospf6_decode_v3(ndo, op, dataend) || 1005 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen)) 1006 goto trunc; 1007 break; 1008 } /* end switch on version */ 1009 1010 return; 1011trunc: 1012 ND_PRINT((ndo, "%s", tstr)); 1013} 1014