print-ospf6.c revision 1.1.1.5
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 (at) mitchell.cit.cornell.edu) 22 */ 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #include <netdissect-stdinc.h> 29 30 #include <string.h> 31 32 #include "netdissect.h" 33 #include "addrtoname.h" 34 #include "extract.h" 35 36 #include "ospf.h" 37 38 #define OSPF_TYPE_HELLO 1 /* Hello */ 39 #define OSPF_TYPE_DD 2 /* Database Description */ 40 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */ 41 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */ 42 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */ 43 44 /* Options *_options */ 45 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */ 46 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */ 47 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */ 48 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */ 49 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */ 50 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */ 51 /* The field is actually 24-bit (RFC5340 Section A.2). */ 52 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */ 53 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */ 54 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */ 55 56 57 /* db_flags */ 58 #define OSPF6_DB_INIT 0x04 /* */ 59 #define OSPF6_DB_MORE 0x02 60 #define OSPF6_DB_MASTER 0x01 61 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */ 62 63 /* ls_type */ 64 #define LS_TYPE_ROUTER 1 /* router link */ 65 #define LS_TYPE_NETWORK 2 /* network link */ 66 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */ 67 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */ 68 #define LS_TYPE_ASE 5 /* ASE */ 69 #define LS_TYPE_GROUP 6 /* Group membership */ 70 #define LS_TYPE_NSSA 7 /* NSSA */ 71 #define LS_TYPE_LINK 8 /* Link LSA */ 72 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */ 73 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */ 74 #define LS_TYPE_GRACE 11 /* Grace LSA */ 75 #define LS_TYPE_RI 12 /* Router information */ 76 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */ 77 #define LS_TYPE_L1VPN 14 /* L1VPN */ 78 #define LS_TYPE_MASK 0x1fff 79 80 #define LS_SCOPE_LINKLOCAL 0x0000 81 #define LS_SCOPE_AREA 0x2000 82 #define LS_SCOPE_AS 0x4000 83 #define LS_SCOPE_MASK 0x6000 84 #define LS_SCOPE_U 0x8000 85 86 /* rla_link.link_type */ 87 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */ 88 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */ 89 #define RLA_TYPE_VIRTUAL 4 /* virtual link */ 90 91 /* rla_flags */ 92 #define RLA_FLAG_B 0x01 93 #define RLA_FLAG_E 0x02 94 #define RLA_FLAG_V 0x04 95 #define RLA_FLAG_W 0x08 96 #define RLA_FLAG_N 0x10 97 98 /* lsa_prefix options */ 99 #define LSA_PREFIX_OPT_NU 0x01 100 #define LSA_PREFIX_OPT_LA 0x02 101 #define LSA_PREFIX_OPT_MC 0x04 102 #define LSA_PREFIX_OPT_P 0x08 103 #define LSA_PREFIX_OPT_DN 0x10 104 105 /* sla_tosmetric breakdown */ 106 #define SLA_MASK_TOS 0x7f000000 107 #define SLA_MASK_METRIC 0x00ffffff 108 #define SLA_SHIFT_TOS 24 109 110 /* asla_metric */ 111 #define ASLA_FLAG_FWDADDR 0x02000000 112 #define ASLA_FLAG_ROUTETAG 0x01000000 113 #define ASLA_MASK_METRIC 0x00ffffff 114 115 /* RFC6506 Section 4.1 */ 116 #define OSPF6_AT_HDRLEN 16U 117 #define OSPF6_AUTH_TYPE_HMAC 0x0001 118 119 typedef uint32_t rtrid_t; 120 121 /* link state advertisement header */ 122 struct lsa6_hdr { 123 uint16_t ls_age; 124 uint16_t ls_type; 125 rtrid_t ls_stateid; 126 rtrid_t ls_router; 127 uint32_t ls_seq; 128 uint16_t ls_chksum; 129 uint16_t ls_length; 130 }; 131 132 /* Length of an IPv6 address, in bytes. */ 133 #define IPV6_ADDR_LEN_BYTES (128/8) 134 135 struct lsa6_prefix { 136 uint8_t lsa_p_len; 137 uint8_t lsa_p_opt; 138 uint16_t lsa_p_metric; 139 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */ 140 }; 141 142 /* link state advertisement */ 143 struct lsa6 { 144 struct lsa6_hdr ls_hdr; 145 146 /* Link state types */ 147 union { 148 /* Router links advertisements */ 149 struct { 150 union { 151 uint8_t flg; 152 uint32_t opt; 153 } rla_flgandopt; 154 #define rla_flags rla_flgandopt.flg 155 #define rla_options rla_flgandopt.opt 156 struct rlalink6 { 157 uint8_t link_type; 158 uint8_t link_zero[1]; 159 uint16_t link_metric; 160 uint32_t link_ifid; 161 uint32_t link_nifid; 162 rtrid_t link_nrtid; 163 } rla_link[1]; /* may repeat */ 164 } un_rla; 165 166 /* Network links advertisements */ 167 struct { 168 uint32_t nla_options; 169 rtrid_t nla_router[1]; /* may repeat */ 170 } un_nla; 171 172 /* Inter Area Prefix LSA */ 173 struct { 174 uint32_t inter_ap_metric; 175 struct lsa6_prefix inter_ap_prefix[1]; 176 } un_inter_ap; 177 178 /* AS external links advertisements */ 179 struct { 180 uint32_t asla_metric; 181 struct lsa6_prefix asla_prefix[1]; 182 /* some optional fields follow */ 183 } un_asla; 184 185 #if 0 186 /* Summary links advertisements */ 187 struct { 188 struct in_addr sla_mask; 189 uint32_t sla_tosmetric[1]; /* may repeat */ 190 } un_sla; 191 192 /* Multicast group membership */ 193 struct mcla { 194 uint32_t mcla_vtype; 195 struct in_addr mcla_vid; 196 } un_mcla[1]; 197 #endif 198 199 /* Type 7 LSA */ 200 201 /* Link LSA */ 202 struct llsa { 203 union { 204 uint8_t pri; 205 uint32_t opt; 206 } llsa_priandopt; 207 #define llsa_priority llsa_priandopt.pri 208 #define llsa_options llsa_priandopt.opt 209 struct in6_addr llsa_lladdr; 210 uint32_t llsa_nprefix; 211 struct lsa6_prefix llsa_prefix[1]; 212 } un_llsa; 213 214 /* Intra-Area-Prefix */ 215 struct { 216 uint16_t intra_ap_nprefix; 217 uint16_t intra_ap_lstype; 218 rtrid_t intra_ap_lsid; 219 rtrid_t intra_ap_rtid; 220 struct lsa6_prefix intra_ap_prefix[1]; 221 } un_intra_ap; 222 } lsa_un; 223 }; 224 225 /* 226 * the main header 227 */ 228 struct ospf6hdr { 229 uint8_t ospf6_version; 230 uint8_t ospf6_type; 231 uint16_t ospf6_len; 232 rtrid_t ospf6_routerid; 233 rtrid_t ospf6_areaid; 234 uint16_t ospf6_chksum; 235 uint8_t ospf6_instanceid; 236 uint8_t ospf6_rsvd; 237 }; 238 239 /* 240 * The OSPF6 header length is 16 bytes, regardless of how your compiler 241 * might choose to pad the above structure. 242 */ 243 #define OSPF6HDR_LEN 16 244 245 /* Hello packet */ 246 struct hello6 { 247 uint32_t hello_ifid; 248 union { 249 uint8_t pri; 250 uint32_t opt; 251 } hello_priandopt; 252 #define hello_priority hello_priandopt.pri 253 #define hello_options hello_priandopt.opt 254 uint16_t hello_helloint; 255 uint16_t hello_deadint; 256 rtrid_t hello_dr; 257 rtrid_t hello_bdr; 258 rtrid_t hello_neighbor[1]; /* may repeat */ 259 }; 260 261 /* Database Description packet */ 262 struct dd6 { 263 uint32_t db_options; 264 uint16_t db_mtu; 265 uint8_t db_mbz; 266 uint8_t db_flags; 267 uint32_t db_seq; 268 struct lsa6_hdr db_lshdr[1]; /* may repeat */ 269 }; 270 271 /* Link State Request */ 272 struct lsr6 { 273 uint16_t ls_mbz; 274 uint16_t ls_type; 275 rtrid_t ls_stateid; 276 rtrid_t ls_router; 277 }; 278 279 /* Link State Update */ 280 struct lsu6 { 281 uint32_t lsu_count; 282 struct lsa6 lsu_lsa[1]; /* may repeat */ 283 }; 284 285 static const char tstr[] = " [|ospf3]"; 286 287 static const struct tok ospf6_option_values[] = { 288 { OSPF6_OPTION_V6, "V6" }, 289 { OSPF6_OPTION_E, "External" }, 290 { OSPF6_OPTION_MC, "Deprecated" }, 291 { OSPF6_OPTION_N, "NSSA" }, 292 { OSPF6_OPTION_R, "Router" }, 293 { OSPF6_OPTION_DC, "Demand Circuit" }, 294 { OSPF6_OPTION_AF, "AFs Support" }, 295 { OSPF6_OPTION_L, "LLS" }, 296 { OSPF6_OPTION_AT, "Authentication Trailer" }, 297 { 0, NULL } 298 }; 299 300 static const struct tok ospf6_rla_flag_values[] = { 301 { RLA_FLAG_B, "ABR" }, 302 { RLA_FLAG_E, "External" }, 303 { RLA_FLAG_V, "Virtual-Link Endpoint" }, 304 { RLA_FLAG_W, "Wildcard Receiver" }, 305 { RLA_FLAG_N, "NSSA Translator" }, 306 { 0, NULL } 307 }; 308 309 static const struct tok ospf6_asla_flag_values[] = { 310 { ASLA_FLAG_EXTERNAL, "External Type 2" }, 311 { ASLA_FLAG_FWDADDR, "Forwarding" }, 312 { ASLA_FLAG_ROUTETAG, "Tag" }, 313 { 0, NULL } 314 }; 315 316 static const struct tok ospf6_type_values[] = { 317 { OSPF_TYPE_HELLO, "Hello" }, 318 { OSPF_TYPE_DD, "Database Description" }, 319 { OSPF_TYPE_LS_REQ, "LS-Request" }, 320 { OSPF_TYPE_LS_UPDATE, "LS-Update" }, 321 { OSPF_TYPE_LS_ACK, "LS-Ack" }, 322 { 0, NULL } 323 }; 324 325 static const struct tok ospf6_lsa_values[] = { 326 { LS_TYPE_ROUTER, "Router" }, 327 { LS_TYPE_NETWORK, "Network" }, 328 { LS_TYPE_INTER_AP, "Inter-Area Prefix" }, 329 { LS_TYPE_INTER_AR, "Inter-Area Router" }, 330 { LS_TYPE_ASE, "External" }, 331 { LS_TYPE_GROUP, "Deprecated" }, 332 { LS_TYPE_NSSA, "NSSA" }, 333 { LS_TYPE_LINK, "Link" }, 334 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" }, 335 { LS_TYPE_INTRA_ATE, "Intra-Area TE" }, 336 { LS_TYPE_GRACE, "Grace" }, 337 { LS_TYPE_RI, "Router Information" }, 338 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" }, 339 { LS_TYPE_L1VPN, "Layer 1 VPN" }, 340 { 0, NULL } 341 }; 342 343 static const struct tok ospf6_ls_scope_values[] = { 344 { LS_SCOPE_LINKLOCAL, "Link Local" }, 345 { LS_SCOPE_AREA, "Area Local" }, 346 { LS_SCOPE_AS, "Domain Wide" }, 347 { 0, NULL } 348 }; 349 350 static const struct tok ospf6_dd_flag_values[] = { 351 { OSPF6_DB_INIT, "Init" }, 352 { OSPF6_DB_MORE, "More" }, 353 { OSPF6_DB_MASTER, "Master" }, 354 { OSPF6_DB_M6, "IPv6 MTU" }, 355 { 0, NULL } 356 }; 357 358 static const struct tok ospf6_lsa_prefix_option_values[] = { 359 { LSA_PREFIX_OPT_NU, "No Unicast" }, 360 { LSA_PREFIX_OPT_LA, "Local address" }, 361 { LSA_PREFIX_OPT_MC, "Deprecated" }, 362 { LSA_PREFIX_OPT_P, "Propagate" }, 363 { LSA_PREFIX_OPT_DN, "Down" }, 364 { 0, NULL } 365 }; 366 367 static const struct tok ospf6_auth_type_str[] = { 368 { OSPF6_AUTH_TYPE_HMAC, "HMAC" }, 369 { 0, NULL } 370 }; 371 372 static void 373 ospf6_print_ls_type(netdissect_options *ndo, 374 register u_int ls_type, register const rtrid_t *ls_stateid) 375 { 376 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s", 377 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK), 378 ls_type & LS_TYPE_MASK, 379 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK), 380 ls_type &0x8000 ? ", transitive" : "", /* U-bit */ 381 ipaddr_string(ndo, ls_stateid))); 382 } 383 384 static int 385 ospf6_print_lshdr(netdissect_options *ndo, 386 register const struct lsa6_hdr *lshp, const u_char *dataend) 387 { 388 if ((const u_char *)(lshp + 1) > dataend) 389 goto trunc; 390 ND_TCHECK(lshp->ls_type); 391 ND_TCHECK(lshp->ls_seq); 392 393 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u", 394 ipaddr_string(ndo, &lshp->ls_router), 395 EXTRACT_32BITS(&lshp->ls_seq), 396 EXTRACT_16BITS(&lshp->ls_age), 397 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr))); 398 399 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid); 400 401 return (0); 402 trunc: 403 return (1); 404 } 405 406 static int 407 ospf6_print_lsaprefix(netdissect_options *ndo, 408 const uint8_t *tptr, u_int lsa_length) 409 { 410 const struct lsa6_prefix *lsapp = (const struct lsa6_prefix *)tptr; 411 u_int wordlen; 412 struct in6_addr prefix; 413 414 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES) 415 goto trunc; 416 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES; 417 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES); 418 wordlen = (lsapp->lsa_p_len + 31) / 32; 419 if (wordlen * 4 > sizeof(struct in6_addr)) { 420 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len)); 421 goto trunc; 422 } 423 if (lsa_length < wordlen * 4) 424 goto trunc; 425 lsa_length -= wordlen * 4; 426 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4); 427 memset(&prefix, 0, sizeof(prefix)); 428 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4); 429 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix), 430 lsapp->lsa_p_len)); 431 if (lsapp->lsa_p_opt) { 432 ND_PRINT((ndo, ", Options [%s]", 433 bittok2str(ospf6_lsa_prefix_option_values, 434 "none", lsapp->lsa_p_opt))); 435 } 436 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric))); 437 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4; 438 439 trunc: 440 return -1; 441 } 442 443 444 /* 445 * Print a single link state advertisement. If truncated return 1, else 0. 446 */ 447 static int 448 ospf6_print_lsa(netdissect_options *ndo, 449 register const struct lsa6 *lsap, const u_char *dataend) 450 { 451 register const struct rlalink6 *rlp; 452 #if 0 453 register const struct tos_metric *tosp; 454 #endif 455 register const rtrid_t *ap; 456 #if 0 457 register const struct aslametric *almp; 458 register const struct mcla *mcp; 459 #endif 460 register const struct llsa *llsap; 461 register const struct lsa6_prefix *lsapp; 462 #if 0 463 register const uint32_t *lp; 464 #endif 465 register u_int prefixes; 466 register int bytelen; 467 register u_int length, lsa_length; 468 uint32_t flags32; 469 const uint8_t *tptr; 470 471 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend)) 472 return (1); 473 ND_TCHECK(lsap->ls_hdr.ls_length); 474 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length); 475 476 /* 477 * The LSA length includes the length of the header; 478 * it must have a value that's at least that length. 479 * If it does, find the length of what follows the 480 * header. 481 */ 482 if (length < sizeof(struct lsa6_hdr) || (const u_char *)lsap + length > dataend) 483 return (1); 484 lsa_length = length - sizeof(struct lsa6_hdr); 485 tptr = (const uint8_t *)lsap+sizeof(struct lsa6_hdr); 486 487 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) { 488 case LS_TYPE_ROUTER | LS_SCOPE_AREA: 489 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options)) 490 return (1); 491 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options); 492 ND_TCHECK(lsap->lsa_un.un_rla.rla_options); 493 ND_PRINT((ndo, "\n\t Options [%s]", 494 bittok2str(ospf6_option_values, "none", 495 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)))); 496 ND_PRINT((ndo, ", RLA-Flags [%s]", 497 bittok2str(ospf6_rla_flag_values, "none", 498 lsap->lsa_un.un_rla.rla_flags))); 499 500 rlp = lsap->lsa_un.un_rla.rla_link; 501 while (lsa_length != 0) { 502 if (lsa_length < sizeof (*rlp)) 503 return (1); 504 lsa_length -= sizeof (*rlp); 505 ND_TCHECK(*rlp); 506 switch (rlp->link_type) { 507 508 case RLA_TYPE_VIRTUAL: 509 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s" 510 "\n\t Neighbor Interface-ID %s, Interface %s", 511 ipaddr_string(ndo, &rlp->link_nrtid), 512 ipaddr_string(ndo, &rlp->link_nifid), 513 ipaddr_string(ndo, &rlp->link_ifid))); 514 break; 515 516 case RLA_TYPE_ROUTER: 517 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s" 518 "\n\t Neighbor Interface-ID %s, Interface %s", 519 ipaddr_string(ndo, &rlp->link_nrtid), 520 ipaddr_string(ndo, &rlp->link_nifid), 521 ipaddr_string(ndo, &rlp->link_ifid))); 522 break; 523 524 case RLA_TYPE_TRANSIT: 525 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s" 526 "\n\t Neighbor Interface-ID %s, Interface %s", 527 ipaddr_string(ndo, &rlp->link_nrtid), 528 ipaddr_string(ndo, &rlp->link_nifid), 529 ipaddr_string(ndo, &rlp->link_ifid))); 530 break; 531 532 default: 533 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x", 534 rlp->link_type)); 535 return (0); 536 } 537 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric))); 538 rlp++; 539 } 540 break; 541 542 case LS_TYPE_NETWORK | LS_SCOPE_AREA: 543 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options)) 544 return (1); 545 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options); 546 ND_TCHECK(lsap->lsa_un.un_nla.nla_options); 547 ND_PRINT((ndo, "\n\t Options [%s]", 548 bittok2str(ospf6_option_values, "none", 549 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)))); 550 551 ND_PRINT((ndo, "\n\t Connected Routers:")); 552 ap = lsap->lsa_un.un_nla.nla_router; 553 while (lsa_length != 0) { 554 if (lsa_length < sizeof (*ap)) 555 return (1); 556 lsa_length -= sizeof (*ap); 557 ND_TCHECK(*ap); 558 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap))); 559 ++ap; 560 } 561 break; 562 563 case LS_TYPE_INTER_AP | LS_SCOPE_AREA: 564 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric)) 565 return (1); 566 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric); 567 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric); 568 ND_PRINT((ndo, ", metric %u", 569 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC)); 570 571 tptr = (const uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix; 572 while (lsa_length != 0) { 573 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 574 if (bytelen < 0) 575 goto trunc; 576 lsa_length -= bytelen; 577 tptr += bytelen; 578 } 579 break; 580 581 case LS_TYPE_ASE | LS_SCOPE_AS: 582 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric)) 583 return (1); 584 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric); 585 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric); 586 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric); 587 ND_PRINT((ndo, "\n\t Flags [%s]", 588 bittok2str(ospf6_asla_flag_values, "none", flags32))); 589 ND_PRINT((ndo, " metric %u", 590 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) & 591 ASLA_MASK_METRIC)); 592 593 tptr = (const uint8_t *)lsap->lsa_un.un_asla.asla_prefix; 594 lsapp = (const struct lsa6_prefix *)tptr; 595 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 596 if (bytelen < 0) 597 goto trunc; 598 lsa_length -= bytelen; 599 tptr += bytelen; 600 601 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) { 602 const struct in6_addr *fwdaddr6; 603 604 fwdaddr6 = (const struct in6_addr *)tptr; 605 if (lsa_length < sizeof (*fwdaddr6)) 606 return (1); 607 lsa_length -= sizeof (*fwdaddr6); 608 ND_TCHECK(*fwdaddr6); 609 ND_PRINT((ndo, " forward %s", 610 ip6addr_string(ndo, fwdaddr6))); 611 tptr += sizeof(*fwdaddr6); 612 } 613 614 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) { 615 if (lsa_length < sizeof (uint32_t)) 616 return (1); 617 lsa_length -= sizeof (uint32_t); 618 ND_TCHECK(*(const uint32_t *)tptr); 619 ND_PRINT((ndo, " tag %s", 620 ipaddr_string(ndo, (const uint32_t *)tptr))); 621 tptr += sizeof(uint32_t); 622 } 623 624 if (lsapp->lsa_p_metric) { 625 if (lsa_length < sizeof (uint32_t)) 626 return (1); 627 lsa_length -= sizeof (uint32_t); 628 ND_TCHECK(*(const uint32_t *)tptr); 629 ND_PRINT((ndo, " RefLSID: %s", 630 ipaddr_string(ndo, (const uint32_t *)tptr))); 631 tptr += sizeof(uint32_t); 632 } 633 break; 634 635 case LS_TYPE_LINK: 636 /* Link LSA */ 637 llsap = &lsap->lsa_un.un_llsa; 638 if (lsa_length < sizeof (llsap->llsa_priandopt)) 639 return (1); 640 lsa_length -= sizeof (llsap->llsa_priandopt); 641 ND_TCHECK(llsap->llsa_priandopt); 642 ND_PRINT((ndo, "\n\t Options [%s]", 643 bittok2str(ospf6_option_values, "none", 644 EXTRACT_32BITS(&llsap->llsa_options)))); 645 646 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix)) 647 return (1); 648 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix); 649 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix); 650 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:", 651 llsap->llsa_priority, 652 ip6addr_string(ndo, &llsap->llsa_lladdr), 653 prefixes)); 654 655 tptr = (const uint8_t *)llsap->llsa_prefix; 656 while (prefixes > 0) { 657 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 658 if (bytelen < 0) 659 goto trunc; 660 prefixes--; 661 lsa_length -= bytelen; 662 tptr += bytelen; 663 } 664 break; 665 666 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA: 667 /* Intra-Area-Prefix LSA */ 668 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid)) 669 return (1); 670 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid); 671 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid); 672 ospf6_print_ls_type(ndo, 673 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype), 674 &lsap->lsa_un.un_intra_ap.intra_ap_lsid); 675 676 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix)) 677 return (1); 678 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 679 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 680 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 681 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes)); 682 683 tptr = (const uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix; 684 while (prefixes > 0) { 685 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 686 if (bytelen < 0) 687 goto trunc; 688 prefixes--; 689 lsa_length -= bytelen; 690 tptr += bytelen; 691 } 692 break; 693 694 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL: 695 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) { 696 return 1; 697 } 698 break; 699 700 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL: 701 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) { 702 return 1; 703 } 704 break; 705 706 default: 707 if(!print_unknown_data(ndo,tptr, 708 "\n\t ", 709 lsa_length)) { 710 return (1); 711 } 712 break; 713 } 714 715 return (0); 716 trunc: 717 return (1); 718 } 719 720 static int 721 ospf6_decode_v3(netdissect_options *ndo, 722 register const struct ospf6hdr *op, 723 register const u_char *dataend) 724 { 725 register const rtrid_t *ap; 726 register const struct lsr6 *lsrp; 727 register const struct lsa6_hdr *lshp; 728 register const struct lsa6 *lsap; 729 register int i; 730 731 switch (op->ospf6_type) { 732 733 case OSPF_TYPE_HELLO: { 734 register const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 735 736 ND_PRINT((ndo, "\n\tOptions [%s]", 737 bittok2str(ospf6_option_values, "none", 738 EXTRACT_32BITS(&hellop->hello_options)))); 739 740 ND_TCHECK(hellop->hello_deadint); 741 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u", 742 EXTRACT_16BITS(&hellop->hello_helloint), 743 EXTRACT_16BITS(&hellop->hello_deadint), 744 ipaddr_string(ndo, &hellop->hello_ifid), 745 hellop->hello_priority)); 746 747 ND_TCHECK(hellop->hello_dr); 748 if (EXTRACT_32BITS(&hellop->hello_dr) != 0) 749 ND_PRINT((ndo, "\n\t Designated Router %s", 750 ipaddr_string(ndo, &hellop->hello_dr))); 751 ND_TCHECK(hellop->hello_bdr); 752 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0) 753 ND_PRINT((ndo, ", Backup Designated Router %s", 754 ipaddr_string(ndo, &hellop->hello_bdr))); 755 if (ndo->ndo_vflag > 1) { 756 ND_PRINT((ndo, "\n\t Neighbor List:")); 757 ap = hellop->hello_neighbor; 758 while ((const u_char *)ap < dataend) { 759 ND_TCHECK(*ap); 760 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap))); 761 ++ap; 762 } 763 } 764 break; /* HELLO */ 765 } 766 767 case OSPF_TYPE_DD: { 768 register const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 769 770 ND_TCHECK(ddp->db_options); 771 ND_PRINT((ndo, "\n\tOptions [%s]", 772 bittok2str(ospf6_option_values, "none", 773 EXTRACT_32BITS(&ddp->db_options)))); 774 ND_TCHECK(ddp->db_flags); 775 ND_PRINT((ndo, ", DD Flags [%s]", 776 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags))); 777 778 ND_TCHECK(ddp->db_seq); 779 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x", 780 EXTRACT_16BITS(&ddp->db_mtu), 781 EXTRACT_32BITS(&ddp->db_seq))); 782 if (ndo->ndo_vflag > 1) { 783 /* Print all the LS adv's */ 784 lshp = ddp->db_lshdr; 785 while ((const u_char *)lshp < dataend) { 786 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 787 goto trunc; 788 } 789 } 790 break; 791 } 792 793 case OSPF_TYPE_LS_REQ: 794 if (ndo->ndo_vflag > 1) { 795 lsrp = (const struct lsr6 *)((const uint8_t *)op + OSPF6HDR_LEN); 796 while ((const u_char *)lsrp < dataend) { 797 ND_TCHECK(*lsrp); 798 ND_PRINT((ndo, "\n\t Advertising Router %s", 799 ipaddr_string(ndo, &lsrp->ls_router))); 800 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type), 801 &lsrp->ls_stateid); 802 ++lsrp; 803 } 804 } 805 break; 806 807 case OSPF_TYPE_LS_UPDATE: 808 if (ndo->ndo_vflag > 1) { 809 register const struct lsu6 *lsup = (const struct lsu6 *)((const uint8_t *)op + OSPF6HDR_LEN); 810 811 ND_TCHECK(lsup->lsu_count); 812 i = EXTRACT_32BITS(&lsup->lsu_count); 813 lsap = lsup->lsu_lsa; 814 while ((const u_char *)lsap < dataend && i--) { 815 if (ospf6_print_lsa(ndo, lsap, dataend)) 816 goto trunc; 817 lsap = (const struct lsa6 *)((const u_char *)lsap + 818 EXTRACT_16BITS(&lsap->ls_hdr.ls_length)); 819 } 820 } 821 break; 822 823 case OSPF_TYPE_LS_ACK: 824 if (ndo->ndo_vflag > 1) { 825 lshp = (const struct lsa6_hdr *)((const uint8_t *)op + OSPF6HDR_LEN); 826 while ((const u_char *)lshp < dataend) { 827 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 828 goto trunc; 829 } 830 } 831 break; 832 833 default: 834 break; 835 } 836 return (0); 837 trunc: 838 return (1); 839 } 840 841 /* RFC5613 Section 2.2 (w/o the TLVs) */ 842 static int 843 ospf6_print_lls(netdissect_options *ndo, 844 const u_char *cp, const u_int len) 845 { 846 uint16_t llsdatalen; 847 848 if (len == 0) 849 return 0; 850 if (len < OSPF_LLS_HDRLEN) 851 goto trunc; 852 /* Checksum */ 853 ND_TCHECK2(*cp, 2); 854 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp))); 855 cp += 2; 856 /* LLS Data Length */ 857 ND_TCHECK2(*cp, 2); 858 llsdatalen = EXTRACT_16BITS(cp); 859 ND_PRINT((ndo, ", Data Length %u", llsdatalen)); 860 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len) 861 goto trunc; 862 cp += 2; 863 /* LLS TLVs */ 864 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN); 865 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */ 866 867 return llsdatalen; 868 trunc: 869 return -1; 870 } 871 872 /* RFC6506 Section 4.1 */ 873 static int 874 ospf6_decode_at(netdissect_options *ndo, 875 const u_char *cp, const u_int len) 876 { 877 uint16_t authdatalen; 878 879 if (len == 0) 880 return 0; 881 if (len < OSPF6_AT_HDRLEN) 882 goto trunc; 883 /* Authentication Type */ 884 ND_TCHECK2(*cp, 2); 885 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp)))); 886 cp += 2; 887 /* Auth Data Len */ 888 ND_TCHECK2(*cp, 2); 889 authdatalen = EXTRACT_16BITS(cp); 890 ND_PRINT((ndo, ", Length %u", authdatalen)); 891 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len) 892 goto trunc; 893 cp += 2; 894 /* Reserved */ 895 ND_TCHECK2(*cp, 2); 896 cp += 2; 897 /* Security Association ID */ 898 ND_TCHECK2(*cp, 2); 899 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp))); 900 cp += 2; 901 /* Cryptographic Sequence Number (High-Order 32 Bits) */ 902 ND_TCHECK2(*cp, 4); 903 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp))); 904 cp += 4; 905 /* Cryptographic Sequence Number (Low-Order 32 Bits) */ 906 ND_TCHECK2(*cp, 4); 907 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp))); 908 cp += 4; 909 /* Authentication Data */ 910 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN); 911 if (ndo->ndo_vflag > 1) 912 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN); 913 return 0; 914 915 trunc: 916 return 1; 917 } 918 919 /* The trailing data may include LLS and/or AT data (in this specific order). 920 * LLS data may be present only in Hello and DBDesc packets with the L-bit set. 921 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in 922 * any other packet type, thus decode the AT data regardless of the AT-bit. 923 */ 924 static int 925 ospf6_decode_v3_trailer(netdissect_options *ndo, 926 const struct ospf6hdr *op, const u_char *cp, const unsigned len) 927 { 928 int llslen = 0; 929 int lls_hello = 0; 930 int lls_dd = 0; 931 932 if (op->ospf6_type == OSPF_TYPE_HELLO) { 933 const struct hello6 *hellop = (const struct hello6 *)((const uint8_t *)op + OSPF6HDR_LEN); 934 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L) 935 lls_hello = 1; 936 } else if (op->ospf6_type == OSPF_TYPE_DD) { 937 const struct dd6 *ddp = (const struct dd6 *)((const uint8_t *)op + OSPF6HDR_LEN); 938 if (EXTRACT_32BITS(&ddp->db_options) & OSPF6_OPTION_L) 939 lls_dd = 1; 940 } 941 if ((lls_hello || lls_dd) && (llslen = ospf6_print_lls(ndo, cp, len)) < 0) 942 goto trunc; 943 return ospf6_decode_at(ndo, cp + llslen, len - llslen); 944 945 trunc: 946 return 1; 947 } 948 949 void 950 ospf6_print(netdissect_options *ndo, 951 register const u_char *bp, register u_int length) 952 { 953 register const struct ospf6hdr *op; 954 register const u_char *dataend; 955 register const char *cp; 956 uint16_t datalen; 957 958 op = (const struct ospf6hdr *)bp; 959 960 /* If the type is valid translate it, or just print the type */ 961 /* value. If it's not valid, say so and return */ 962 ND_TCHECK(op->ospf6_type); 963 cp = tok2str(ospf6_type_values, "unknown packet type (%u)", op->ospf6_type); 964 ND_PRINT((ndo, "OSPFv%u, %s, length %d", op->ospf6_version, cp, length)); 965 if (*cp == 'u') { 966 return; 967 } 968 969 if(!ndo->ndo_vflag) { /* non verbose - so lets bail out here */ 970 return; 971 } 972 973 /* OSPFv3 data always comes first and optional trailing data may follow. */ 974 ND_TCHECK(op->ospf6_len); 975 datalen = EXTRACT_16BITS(&op->ospf6_len); 976 if (datalen > length) { 977 ND_PRINT((ndo, " [len %d]", datalen)); 978 return; 979 } 980 dataend = bp + datalen; 981 982 ND_TCHECK(op->ospf6_routerid); 983 ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf6_routerid))); 984 985 ND_TCHECK(op->ospf6_areaid); 986 if (EXTRACT_32BITS(&op->ospf6_areaid) != 0) 987 ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf6_areaid))); 988 else 989 ND_PRINT((ndo, ", Backbone Area")); 990 ND_TCHECK(op->ospf6_instanceid); 991 if (op->ospf6_instanceid) 992 ND_PRINT((ndo, ", Instance %u", op->ospf6_instanceid)); 993 994 /* Do rest according to version. */ 995 switch (op->ospf6_version) { 996 997 case 3: 998 /* ospf version 3 */ 999 if (ospf6_decode_v3(ndo, op, dataend) || 1000 ospf6_decode_v3_trailer(ndo, op, dataend, length - datalen)) 1001 goto trunc; 1002 break; 1003 } /* end switch on version */ 1004 1005 return; 1006 trunc: 1007 ND_PRINT((ndo, "%s", tstr)); 1008 } 1009
Indexes created Sat Mar 14 00:24:00 UTC 2026