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 120 121 typedef uint32_t rtrid_t; 122 123 /* link state advertisement header */ 124 struct 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) 136 137 struct 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 */ 145 struct 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 */ 230 struct 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 */ 248 struct 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 */ 264 struct 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 */ 274 struct 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 */ 282 struct lsu6 { 283 uint32_t lsu_count; 284 struct lsa6 lsu_lsa[1]; /* may repeat */ 285 }; 286 287 static const char tstr[] = " [|ospf3]"; 288 289 static 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 }; 301 302 static 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 }; 310 311 static 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 }; 317 318 static 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 }; 326 327 static 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 }; 344 345 static 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 }; 351 352 static 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 }; 359 360 static 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 }; 368 369 static const struct tok ospf6_auth_type_str[] = { 370 { OSPF6_AUTH_TYPE_HMAC, "HMAC" }, 371 { 0, NULL } 372 }; 373 374 static void 375 ospf6_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 } 385 386 static int 387 ospf6_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_type); 393 ND_TCHECK(lshp->ls_seq); 394 395 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u", 396 ipaddr_string(ndo, &lshp->ls_router), 397 EXTRACT_32BITS(&lshp->ls_seq), 398 EXTRACT_16BITS(&lshp->ls_age), 399 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr))); 400 401 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid); 402 403 return (0); 404 trunc: 405 return (1); 406 } 407 408 static int 409 ospf6_print_lsaprefix(netdissect_options *ndo, 410 const uint8_t *tptr, u_int lsa_length) 411 { 412 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr; 413 u_int wordlen; 414 struct in6_addr prefix; 415 416 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES) 417 goto trunc; 418 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES; 419 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES); 420 wordlen = (lsapp->lsa_p_len + 31) / 32; 421 if (wordlen * 4 > sizeof(struct in6_addr)) { 422 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len)); 423 goto trunc; 424 } 425 if (lsa_length < wordlen * 4) 426 goto trunc; 427 lsa_length -= wordlen * 4; 428 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4); 429 memset(&prefix, 0, sizeof(prefix)); 430 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4); 431 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix), 432 lsapp->lsa_p_len)); 433 if (lsapp->lsa_p_opt) { 434 ND_PRINT((ndo, ", Options [%s]", 435 bittok2str(ospf6_lsa_prefix_option_values, 436 "none", lsapp->lsa_p_opt))); 437 } 438 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric))); 439 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4; 440 441 trunc: 442 return -1; 443 } 444 445 446 /* 447 * Print a single link state advertisement. If truncated return 1, else 0. 448 */ 449 static int 450 ospf6_print_lsa(netdissect_options *ndo, 451 register const struct lsa6 *lsap, const u_char *dataend) 452 { 453 register const struct rlalink6 *rlp; 454 #if 0 455 register const struct tos_metric *tosp; 456 #endif 457 register const rtrid_t *ap; 458 #if 0 459 register const struct aslametric *almp; 460 register const struct mcla *mcp; 461 #endif 462 register const struct llsa *llsap; 463 register const struct lsa6_prefix *lsapp; 464 #if 0 465 register const uint32_t *lp; 466 #endif 467 register u_int prefixes; 468 register int bytelen; 469 register u_int length, lsa_length; 470 uint32_t flags32; 471 const uint8_t *tptr; 472 473 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend)) 474 return (1); 475 ND_TCHECK(lsap->ls_hdr.ls_length); 476 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length); 477 478 /* 479 * The LSA length includes the length of the header; 480 * it must have a value that's at least that length. 481 * If it does, find the length of what follows the 482 * header. 483 */ 484 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend) 485 return (1); 486 lsa_length = length - sizeof(struct lsa6_hdr); 487 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr); 488 489 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) { 490 case LS_TYPE_ROUTER | LS_SCOPE_AREA: 491 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options)) 492 return (1); 493 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options); 494 ND_TCHECK(lsap->lsa_un.un_rla.rla_options); 495 ND_PRINT((ndo, "\n\t Options [%s]", 496 bittok2str(ospf6_option_values, "none", 497 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)))); 498 ND_PRINT((ndo, ", RLA-Flags [%s]", 499 bittok2str(ospf6_rla_flag_values, "none", 500 lsap->lsa_un.un_rla.rla_flags))); 501 502 rlp = lsap->lsa_un.un_rla.rla_link; 503 while (lsa_length != 0) { 504 if (lsa_length < sizeof (*rlp)) 505 return (1); 506 lsa_length -= sizeof (*rlp); 507 ND_TCHECK(*rlp); 508 switch (rlp->link_type) { 509 510 case RLA_TYPE_VIRTUAL: 511 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s" 512 "\n\t Neighbor Interface-ID %s, Interface %s", 513 ipaddr_string(ndo, &rlp->link_nrtid), 514 ipaddr_string(ndo, &rlp->link_nifid), 515 ipaddr_string(ndo, &rlp->link_ifid))); 516 break; 517 518 case RLA_TYPE_ROUTER: 519 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s" 520 "\n\t Neighbor Interface-ID %s, Interface %s", 521 ipaddr_string(ndo, &rlp->link_nrtid), 522 ipaddr_string(ndo, &rlp->link_nifid), 523 ipaddr_string(ndo, &rlp->link_ifid))); 524 break; 525 526 case RLA_TYPE_TRANSIT: 527 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s" 528 "\n\t Neighbor Interface-ID %s, Interface %s", 529 ipaddr_string(ndo, &rlp->link_nrtid), 530 ipaddr_string(ndo, &rlp->link_nifid), 531 ipaddr_string(ndo, &rlp->link_ifid))); 532 break; 533 534 default: 535 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x", 536 rlp->link_type)); 537 return (0); 538 } 539 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric))); 540 rlp++; 541 } 542 break; 543 544 case LS_TYPE_NETWORK | LS_SCOPE_AREA: 545 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options)) 546 return (1); 547 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options); 548 ND_TCHECK(lsap->lsa_un.un_nla.nla_options); 549 ND_PRINT((ndo, "\n\t Options [%s]", 550 bittok2str(ospf6_option_values, "none", 551 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)))); 552 553 ND_PRINT((ndo, "\n\t Connected Routers:")); 554 ap = lsap->lsa_un.un_nla.nla_router; 555 while (lsa_length != 0) { 556 if (lsa_length < sizeof (*ap)) 557 return (1); 558 lsa_length -= sizeof (*ap); 559 ND_TCHECK(*ap); 560 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap))); 561 ++ap; 562 } 563 break; 564 565 case LS_TYPE_INTER_AP | LS_SCOPE_AREA: 566 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric)) 567 return (1); 568 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric); 569 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric); 570 ND_PRINT((ndo, ", metric %u", 571 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC)); 572 573 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix; 574 while (lsa_length != 0) { 575 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 576 if (bytelen < 0) 577 goto trunc; 578 lsa_length -= bytelen; 579 tptr += bytelen; 580 } 581 break; 582 583 case LS_TYPE_ASE | LS_SCOPE_AS: 584 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric)) 585 return (1); 586 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric); 587 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric); 588 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric); 589 ND_PRINT((ndo, "\n\t Flags [%s]", 590 bittok2str(ospf6_asla_flag_values, "none", flags32))); 591 ND_PRINT((ndo, " metric %u", 592 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) & 593 ASLA_MASK_METRIC)); 594 595 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix; 596 lsapp = (const struct lsa6_prefix *)tptr; 597 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 598 if (bytelen < 0) 599 goto trunc; 600 lsa_length -= bytelen; 601 tptr += bytelen; 602 603 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) { 604 const struct in6_addr *fwdaddr6; 605 606 fwdaddr6 = (const struct in6_addr *)tptr; 607 if (lsa_length < sizeof (*fwdaddr6)) 608 return (1); 609 lsa_length -= sizeof (*fwdaddr6); 610 ND_TCHECK(*fwdaddr6); 611 ND_PRINT((ndo, " forward %s", 612 ip6addr_string(ndo, fwdaddr6))); 613 tptr += sizeof(*fwdaddr6); 614 } 615 616 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) { 617 if (lsa_length < sizeof (uint32_t)) 618 return (1); 619 lsa_length -= sizeof (uint32_t); 620 ND_TCHECK(*(const uint32_t *)tptr); 621 ND_PRINT((ndo, " tag %s", 622 ipaddr_string(ndo, (const uint32_t *)tptr))); 623 tptr += sizeof(uint32_t); 624 } 625 626 if (lsapp->lsa_p_metric) { 627 if (lsa_length < sizeof (uint32_t)) 628 return (1); 629 lsa_length -= sizeof (uint32_t); 630 ND_TCHECK(*(const uint32_t *)tptr); 631 ND_PRINT((ndo, " RefLSID: %s", 632 ipaddr_string(ndo, (const uint32_t *)tptr))); 633 tptr += sizeof(uint32_t); 634 } 635 break; 636 637 case LS_TYPE_LINK: 638 /* Link LSA */ 639 llsap = &lsap->lsa_un.un_llsa; 640 if (lsa_length < sizeof (llsap->llsa_priandopt)) 641 return (1); 642 lsa_length -= sizeof (llsap->llsa_priandopt); 643 ND_TCHECK(llsap->llsa_priandopt); 644 ND_PRINT((ndo, "\n\t Options [%s]", 645 bittok2str(ospf6_option_values, "none", 646 EXTRACT_32BITS(&llsap->llsa_options)))); 647 648 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix)) 649 return (1); 650 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix); 651 ND_TCHECK(llsap->llsa_nprefix); 652 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix); 653 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:", 654 llsap->llsa_priority, 655 ip6addr_string(ndo, &llsap->llsa_lladdr), 656 prefixes)); 657 658 tptr = (const uint8_t *)llsap->llsa_prefix; 659 while (prefixes > 0) { 660 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 661 if (bytelen < 0) 662 goto trunc; 663 prefixes--; 664 lsa_length -= bytelen; 665 tptr += bytelen; 666 } 667 break; 668 669 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA: 670 /* Intra-Area-Prefix LSA */ 671 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid)) 672 return (1); 673 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid); 674 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid); 675 ospf6_print_ls_type(ndo, 676 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype), 677 &lsap->lsa_un.un_intra_ap.intra_ap_lsid); 678 679 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix)) 680 return (1); 681 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 682 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 683 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 684 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes)); 685 686 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix; 687 while (prefixes > 0) { 688 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 689 if (bytelen < 0) 690 goto trunc; 691 prefixes--; 692 lsa_length -= bytelen; 693 tptr += bytelen; 694 } 695 break; 696 697 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL: 698 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) { 699 return 1; 700 } 701 break; 702 703 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL: 704 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) { 705 return 1; 706 } 707 break; 708 709 default: 710 if(!print_unknown_data(ndo,tptr, 711 "\n\t ", 712 lsa_length)) { 713 return (1); 714 } 715 break; 716 } 717 718 return (0); 719 trunc: 720 return (1); 721 } 722 723 static int 724 ospf6_decode_v3(netdissect_options *ndo, 725 register const struct ospf6hdr *op, 726 register const u_char *dataend) 727 { 728 register const rtrid_t *ap; 729 register const struct lsr6 *lsrp; 730 register const struct lsa6_hdr *lshp; 731 register const struct lsa6 *lsap; 732 register int i; 733 734 switch (op->ospf6_type) { 735 736 case OSPF_TYPE_HELLO: { 737 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 738 739 ND_TCHECK_32BITS(&hellop->hello_options); 740 ND_PRINT((ndo, "\n\tOptions [%s]", 741 bittok2str(ospf6_option_values, "none", 742 EXTRACT_32BITS(&hellop->hello_options)))); 743 744 ND_TCHECK(hellop->hello_deadint); 745 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u", 746 EXTRACT_16BITS(&hellop->hello_helloint), 747 EXTRACT_16BITS(&hellop->hello_deadint), 748 ipaddr_string(ndo, &hellop->hello_ifid), 749 hellop->hello_priority)); 750 751 ND_TCHECK(hellop->hello_dr); 752 if (EXTRACT_32BITS(&hellop->hello_dr) != 0) 753 ND_PRINT((ndo, "\n\t Designated Router %s", 754 ipaddr_string(ndo, &hellop->hello_dr))); 755 ND_TCHECK(hellop->hello_bdr); 756 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0) 757 ND_PRINT((ndo, ", Backup Designated Router %s", 758 ipaddr_string(ndo, &hellop->hello_bdr))); 759 if (ndo->ndo_vflag > 1) { 760 ND_PRINT((ndo, "\n\t Neighbor List:")); 761 ap = hellop->hello_neighbor; 762 while ((const u_char *)ap < dataend) { 763 ND_TCHECK(*ap); 764 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap))); 765 ++ap; 766 } 767 } 768 break; /* HELLO */ 769 } 770 771 case OSPF_TYPE_DD: { 772 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 773 774 ND_TCHECK(ddp->db_options); 775 ND_PRINT((ndo, "\n\tOptions [%s]", 776 bittok2str(ospf6_option_values, "none", 777 EXTRACT_32BITS(&ddp->db_options)))); 778 ND_TCHECK(ddp->db_flags); 779 ND_PRINT((ndo, ", DD Flags [%s]", 780 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags))); 781 782 ND_TCHECK(ddp->db_seq); 783 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x", 784 EXTRACT_16BITS(&ddp->db_mtu), 785 EXTRACT_32BITS(&ddp->db_seq))); 786 if (ndo->ndo_vflag > 1) { 787 /* Print all the LS adv's */ 788 lshp = ddp->db_lshdr; 789 while ((const u_char *)lshp < dataend) { 790 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 791 goto trunc; 792 } 793 } 794 break; 795 } 796 797 case OSPF_TYPE_LS_REQ: 798 if (ndo->ndo_vflag > 1) { 799 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN); 800 while ((const u_char *)lsrp < dataend) { 801 ND_TCHECK(*lsrp); 802 ND_PRINT((ndo, "\n\t Advertising Router %s", 803 ipaddr_string(ndo, &lsrp->ls_router))); 804 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type), 805 &lsrp->ls_stateid); 806 ++lsrp; 807 } 808 } 809 break; 810 811 case OSPF_TYPE_LS_UPDATE: 812 if (ndo->ndo_vflag > 1) { 813 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN); 814 815 ND_TCHECK(lsup->lsu_count); 816 i = EXTRACT_32BITS(&lsup->lsu_count); 817 lsap = lsup->lsu_lsa; 818 while ((const u_char *)lsap < dataend && i--) { 819 if (ospf6_print_lsa(ndo, lsap, dataend)) 820 goto trunc; 821 lsap = (const struct lsa6 *)((const u_char *)lsap + 822 EXTRACT_16BITS(&lsap->ls_hdr.ls_length)); 823 } 824 } 825 break; 826 827 case OSPF_TYPE_LS_ACK: 828 if (ndo->ndo_vflag > 1) { 829 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN); 830 while ((const u_char *)lshp < dataend) { 831 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 832 goto trunc; 833 } 834 } 835 break; 836 837 default: 838 break; 839 } 840 return (0); 841 trunc: 842 return (1); 843 } 844 845 /* RFC5613 Section 2.2 (w/o the TLVs) */ 846 static int 847 ospf6_print_lls(netdissect_options *ndo, 848 const u_char *cp, const u_int len) 849 { 850 uint16_t llsdatalen; 851 852 if (len == 0) 853 return 0; 854 if (len < OSPF_LLS_HDRLEN) 855 goto trunc; 856 /* Checksum */ 857 ND_TCHECK2(*cp, 2); 858 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp))); 859 cp += 2; 860 /* LLS Data Length */ 861 ND_TCHECK2(*cp, 2); 862 llsdatalen = EXTRACT_16BITS(cp); 863 ND_PRINT((ndo, ", Data Length %u", llsdatalen)); 864 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len) 865 goto trunc; 866 cp += 2; 867 /* LLS TLVs */ 868 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN); 869 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */ 870 871 return llsdatalen; 872 trunc: 873 return -1; 874 } 875 876 /* RFC6506 Section 4.1 */ 877 static int 878 ospf6_decode_at(netdissect_options *ndo, 879 const u_char *cp, const u_int len) 880 { 881 uint16_t authdatalen; 882 883 if (len == 0) 884 return 0; 885 if (len < OSPF6_AT_HDRLEN) 886 goto trunc; 887 /* Authentication Type */ 888 ND_TCHECK2(*cp, 2); 889 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp)))); 890 cp += 2; 891 /* Auth Data Len */ 892 ND_TCHECK2(*cp, 2); 893 authdatalen = EXTRACT_16BITS(cp); 894 ND_PRINT((ndo, ", Length %u", authdatalen)); 895 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len) 896 goto trunc; 897 cp += 2; 898 /* Reserved */ 899 ND_TCHECK2(*cp, 2); 900 cp += 2; 901 /* Security Association ID */ 902 ND_TCHECK2(*cp, 2); 903 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp))); 904 cp += 2; 905 /* Cryptographic Sequence Number (High-Order 32 Bits) */ 906 ND_TCHECK2(*cp, 4); 907 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp))); 908 cp += 4; 909 /* Cryptographic Sequence Number (Low-Order 32 Bits) */ 910 ND_TCHECK2(*cp, 4); 911 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp))); 912 cp += 4; 913 /* Authentication Data */ 914 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN); 915 if (ndo->ndo_vflag > 1) 916 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN); 917 return 0; 918 919 trunc: 920 return 1; 921 } 922 923 /* The trailing data may include LLS and/or AT data (in this specific order). 924 * LLS data may be present only in Hello and DBDesc packets with the L-bit set. 925 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in 926 * any other packet type, thus decode the AT data regardless of the AT-bit. 927 */ 928 static int 929 ospf6_decode_v3_trailer(netdissect_options *ndo, 930 const struct ospf6hdr *op, const u_char *cp, const unsigned len) 931 { 932 int llslen = 0; 933 int lls_hello = 0; 934 int lls_dd = 0; 935 936 if (op->ospf6_type == OSPF_TYPE_HELLO) { 937 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 938 ND_TCHECK(hellop->hello_options); 939 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L) 940 lls_hello = 1; 941 } else if (op->ospf6_type == OSPF_TYPE_DD) { 942 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 943 ND_TCHECK(ddp->db_options); 944 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L) 945 lls_dd = 1; 946 } 947 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0) 948 goto trunc; 949 return ospf6_decode_at(ndo, cp + llslen, len - llslen); 950 951 trunc: 952 return 1; 953 } 954 955 void 956 ospf6_print(netdissect_options *ndo, 957 register const u_char *bp, register u_int length) 958 { 959 register const struct ospf6hdr *op; 960 register const u_char *dataend; 961 register const char *cp; 962 uint16_t datalen; 963 964 op = (const struct ospf6hdr *)bp; 965 966 /* If the type is valid translate it, or just print the type */ 967 /* value. If it's not valid, say so and return */ 968 ND_TCHECK(op->ospf6_type); 969 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type); 970 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length)); 971 if (*cp == 'u') { 972 return; 973 } 974 975 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */ 976 return; 977 } 978 979 /* OSPFv3 data always comes first and optional trailing data may follow. */ 980 ND_TCHECK(op->ospf6_len); 981 datalen = EXTRACT_16BITS(&op->ospf6_len); 982 if (datalen > length) { 983 ND_PRINT((ndo, " [len %d]", datalen)); 984 return; 985 } 986 dataend = bp + datalen; 987 988 ND_TCHECK(op->ospf6_routerid); 989 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid))); 990 991 ND_TCHECK(op->ospf6_areaid); 992 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0) 993 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid))); 994 else 995 ND_PRINT((ndo, ", Backbone Area")); 996 ND_TCHECK(op->ospf6_instanceid); 997 if (op->ospf6_instanceid) 998 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid)); 999 1000 /* Do rest according to version. */ 1001 switch (op->ospf6_version) { 1002 1003 case 3: 1004 /* ospf version 3 */ 1005 if (ospf6_decode_v3(ndo, op, dataend) || 1006 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen)) 1007 goto trunc; 1008 break; 1009 } /* end switch on version */ 1010 1011 return; 1012 trunc: 1013 ND_PRINT((ndo, "%s", tstr)); 1014 } 1015