print-ospf6.c revision 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 #include <sys/cdefs.h> 25 #ifndef lint 26 __RCSID("$NetBSD: print-ospf6.c,v 1.5 2014/11/20 03:05:03 christos Exp $"); 27 #endif 28 29 #define NETDISSECT_REWORKED 30 #ifdef HAVE_CONFIG_H 31 #include "config.h" 32 #endif 33 34 #include <tcpdump-stdinc.h> 35 36 #include <string.h> 37 38 #include "interface.h" 39 #include "addrtoname.h" 40 #include "extract.h" 41 42 #include "ospf.h" 43 44 #define OSPF_TYPE_HELLO 1 /* Hello */ 45 #define OSPF_TYPE_DD 2 /* Database Description */ 46 #define OSPF_TYPE_LS_REQ 3 /* Link State Request */ 47 #define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */ 48 #define OSPF_TYPE_LS_ACK 5 /* Link State Ack */ 49 50 /* Options *_options */ 51 #define OSPF6_OPTION_V6 0x01 /* V6 bit: A bit for peeping tom */ 52 #define OSPF6_OPTION_E 0x02 /* E bit: External routes advertised */ 53 #define OSPF6_OPTION_MC 0x04 /* MC bit: Multicast capable */ 54 #define OSPF6_OPTION_N 0x08 /* N bit: For type-7 LSA */ 55 #define OSPF6_OPTION_R 0x10 /* R bit: Router bit */ 56 #define OSPF6_OPTION_DC 0x20 /* DC bit: Demand circuits */ 57 /* The field is actually 24-bit (RFC5340 Section A.2). */ 58 #define OSPF6_OPTION_AF 0x0100 /* AF bit: Multiple address families */ 59 #define OSPF6_OPTION_L 0x0200 /* L bit: Link-local signaling (LLS) */ 60 #define OSPF6_OPTION_AT 0x0400 /* AT bit: Authentication trailer */ 61 62 63 /* db_flags */ 64 #define OSPF6_DB_INIT 0x04 /* */ 65 #define OSPF6_DB_MORE 0x02 66 #define OSPF6_DB_MASTER 0x01 67 #define OSPF6_DB_M6 0x10 /* IPv6 MTU */ 68 69 /* ls_type */ 70 #define LS_TYPE_ROUTER 1 /* router link */ 71 #define LS_TYPE_NETWORK 2 /* network link */ 72 #define LS_TYPE_INTER_AP 3 /* Inter-Area-Prefix */ 73 #define LS_TYPE_INTER_AR 4 /* Inter-Area-Router */ 74 #define LS_TYPE_ASE 5 /* ASE */ 75 #define LS_TYPE_GROUP 6 /* Group membership */ 76 #define LS_TYPE_NSSA 7 /* NSSA */ 77 #define LS_TYPE_LINK 8 /* Link LSA */ 78 #define LS_TYPE_INTRA_AP 9 /* Intra-Area-Prefix */ 79 #define LS_TYPE_INTRA_ATE 10 /* Intra-Area-TE */ 80 #define LS_TYPE_GRACE 11 /* Grace LSA */ 81 #define LS_TYPE_RI 12 /* Router information */ 82 #define LS_TYPE_INTER_ASTE 13 /* Inter-AS-TE */ 83 #define LS_TYPE_L1VPN 14 /* L1VPN */ 84 #define LS_TYPE_MASK 0x1fff 85 86 #define LS_SCOPE_LINKLOCAL 0x0000 87 #define LS_SCOPE_AREA 0x2000 88 #define LS_SCOPE_AS 0x4000 89 #define LS_SCOPE_MASK 0x6000 90 #define LS_SCOPE_U 0x8000 91 92 /* rla_link.link_type */ 93 #define RLA_TYPE_ROUTER 1 /* point-to-point to another router */ 94 #define RLA_TYPE_TRANSIT 2 /* connection to transit network */ 95 #define RLA_TYPE_VIRTUAL 4 /* virtual link */ 96 97 /* rla_flags */ 98 #define RLA_FLAG_B 0x01 99 #define RLA_FLAG_E 0x02 100 #define RLA_FLAG_V 0x04 101 #define RLA_FLAG_W 0x08 102 #define RLA_FLAG_N 0x10 103 104 /* lsa_prefix options */ 105 #define LSA_PREFIX_OPT_NU 0x01 106 #define LSA_PREFIX_OPT_LA 0x02 107 #define LSA_PREFIX_OPT_MC 0x04 108 #define LSA_PREFIX_OPT_P 0x08 109 #define LSA_PREFIX_OPT_DN 0x10 110 111 /* sla_tosmetric breakdown */ 112 #define SLA_MASK_TOS 0x7f000000 113 #define SLA_MASK_METRIC 0x00ffffff 114 #define SLA_SHIFT_TOS 24 115 116 /* asla_metric */ 117 #define ASLA_FLAG_FWDADDR 0x02000000 118 #define ASLA_FLAG_ROUTETAG 0x01000000 119 #define ASLA_MASK_METRIC 0x00ffffff 120 121 /* RFC6506 Section 4.1 */ 122 #define OSPF6_AT_HDRLEN 16U 123 #define OSPF6_AUTH_TYPE_HMAC 0x0001 124 125 typedef uint32_t rtrid_t; 126 127 /* link state advertisement header */ 128 struct lsa6_hdr { 129 uint16_t ls_age; 130 uint16_t ls_type; 131 rtrid_t ls_stateid; 132 rtrid_t ls_router; 133 uint32_t ls_seq; 134 uint16_t ls_chksum; 135 uint16_t ls_length; 136 }; 137 138 /* Length of an IPv6 address, in bytes. */ 139 #define IPV6_ADDR_LEN_BYTES (128/8) 140 141 struct lsa6_prefix { 142 uint8_t lsa_p_len; 143 uint8_t lsa_p_opt; 144 uint16_t lsa_p_metric; 145 uint8_t lsa_p_prefix[IPV6_ADDR_LEN_BYTES]; /* maximum length */ 146 }; 147 148 /* link state advertisement */ 149 struct lsa6 { 150 struct lsa6_hdr ls_hdr; 151 152 /* Link state types */ 153 union { 154 /* Router links advertisements */ 155 struct { 156 union { 157 uint8_t flg; 158 uint32_t opt; 159 } rla_flgandopt; 160 #define rla_flags rla_flgandopt.flg 161 #define rla_options rla_flgandopt.opt 162 struct rlalink6 { 163 uint8_t link_type; 164 uint8_t link_zero[1]; 165 uint16_t link_metric; 166 uint32_t link_ifid; 167 uint32_t link_nifid; 168 rtrid_t link_nrtid; 169 } rla_link[1]; /* may repeat */ 170 } un_rla; 171 172 /* Network links advertisements */ 173 struct { 174 uint32_t nla_options; 175 rtrid_t nla_router[1]; /* may repeat */ 176 } un_nla; 177 178 /* Inter Area Prefix LSA */ 179 struct { 180 uint32_t inter_ap_metric; 181 struct lsa6_prefix inter_ap_prefix[1]; 182 } un_inter_ap; 183 184 /* AS external links advertisements */ 185 struct { 186 uint32_t asla_metric; 187 struct lsa6_prefix asla_prefix[1]; 188 /* some optional fields follow */ 189 } un_asla; 190 191 #if 0 192 /* Summary links advertisements */ 193 struct { 194 struct in_addr sla_mask; 195 uint32_t sla_tosmetric[1]; /* may repeat */ 196 } un_sla; 197 198 /* Multicast group membership */ 199 struct mcla { 200 uint32_t mcla_vtype; 201 struct in_addr mcla_vid; 202 } un_mcla[1]; 203 #endif 204 205 /* Type 7 LSA */ 206 207 /* Link LSA */ 208 struct llsa { 209 union { 210 uint8_t pri; 211 uint32_t opt; 212 } llsa_priandopt; 213 #define llsa_priority llsa_priandopt.pri 214 #define llsa_options llsa_priandopt.opt 215 struct in6_addr llsa_lladdr; 216 uint32_t llsa_nprefix; 217 struct lsa6_prefix llsa_prefix[1]; 218 } un_llsa; 219 220 /* Intra-Area-Prefix */ 221 struct { 222 uint16_t intra_ap_nprefix; 223 uint16_t intra_ap_lstype; 224 rtrid_t intra_ap_lsid; 225 rtrid_t intra_ap_rtid; 226 struct lsa6_prefix intra_ap_prefix[1]; 227 } un_intra_ap; 228 } lsa_un; 229 }; 230 231 /* 232 * the main header 233 */ 234 struct ospf6hdr { 235 uint8_t ospf6_version; 236 uint8_t ospf6_type; 237 uint16_t ospf6_len; 238 rtrid_t ospf6_routerid; 239 rtrid_t ospf6_areaid; 240 uint16_t ospf6_chksum; 241 uint8_t ospf6_instanceid; 242 uint8_t ospf6_rsvd; 243 }; 244 245 /* 246 * The OSPF6 header length is 16 bytes, regardless of how your compiler 247 * might choose to pad the above structure. 248 */ 249 #define OSPF6HDR_LEN 16 250 251 /* Hello packet */ 252 struct hello6 { 253 uint32_t hello_ifid; 254 union { 255 uint8_t pri; 256 uint32_t opt; 257 } hello_priandopt; 258 #define hello_priority hello_priandopt.pri 259 #define hello_options hello_priandopt.opt 260 uint16_t hello_helloint; 261 uint16_t hello_deadint; 262 rtrid_t hello_dr; 263 rtrid_t hello_bdr; 264 rtrid_t hello_neighbor[1]; /* may repeat */ 265 }; 266 267 /* Database Description packet */ 268 struct dd6 { 269 uint32_t db_options; 270 uint16_t db_mtu; 271 uint8_t db_mbz; 272 uint8_t db_flags; 273 uint32_t db_seq; 274 struct lsa6_hdr db_lshdr[1]; /* may repeat */ 275 }; 276 277 /* Link State Request */ 278 struct lsr6 { 279 uint16_t ls_mbz; 280 uint16_t ls_type; 281 rtrid_t ls_stateid; 282 rtrid_t ls_router; 283 }; 284 285 /* Link State Update */ 286 struct lsu6 { 287 uint32_t lsu_count; 288 struct lsa6 lsu_lsa[1]; /* may repeat */ 289 }; 290 291 static const char tstr[] = " [|ospf3]"; 292 293 static const struct tok ospf6_option_values[] = { 294 { OSPF6_OPTION_V6, "V6" }, 295 { OSPF6_OPTION_E, "External" }, 296 { OSPF6_OPTION_MC, "Deprecated" }, 297 { OSPF6_OPTION_N, "NSSA" }, 298 { OSPF6_OPTION_R, "Router" }, 299 { OSPF6_OPTION_DC, "Demand Circuit" }, 300 { OSPF6_OPTION_AF, "AFs Support" }, 301 { OSPF6_OPTION_L, "LLS" }, 302 { OSPF6_OPTION_AT, "Authentication Trailer" }, 303 { 0, NULL } 304 }; 305 306 static const struct tok ospf6_rla_flag_values[] = { 307 { RLA_FLAG_B, "ABR" }, 308 { RLA_FLAG_E, "External" }, 309 { RLA_FLAG_V, "Virtual-Link Endpoint" }, 310 { RLA_FLAG_W, "Wildcard Receiver" }, 311 { RLA_FLAG_N, "NSSA Translator" }, 312 { 0, NULL } 313 }; 314 315 static const struct tok ospf6_asla_flag_values[] = { 316 { ASLA_FLAG_EXTERNAL, "External Type 2" }, 317 { ASLA_FLAG_FWDADDR, "Forwarding" }, 318 { ASLA_FLAG_ROUTETAG, "Tag" }, 319 { 0, NULL } 320 }; 321 322 static const struct tok ospf6_type_values[] = { 323 { OSPF_TYPE_HELLO, "Hello" }, 324 { OSPF_TYPE_DD, "Database Description" }, 325 { OSPF_TYPE_LS_REQ, "LS-Request" }, 326 { OSPF_TYPE_LS_UPDATE, "LS-Update" }, 327 { OSPF_TYPE_LS_ACK, "LS-Ack" }, 328 { 0, NULL } 329 }; 330 331 static const struct tok ospf6_lsa_values[] = { 332 { LS_TYPE_ROUTER, "Router" }, 333 { LS_TYPE_NETWORK, "Network" }, 334 { LS_TYPE_INTER_AP, "Inter-Area Prefix" }, 335 { LS_TYPE_INTER_AR, "Inter-Area Router" }, 336 { LS_TYPE_ASE, "External" }, 337 { LS_TYPE_GROUP, "Deprecated" }, 338 { LS_TYPE_NSSA, "NSSA" }, 339 { LS_TYPE_LINK, "Link" }, 340 { LS_TYPE_INTRA_AP, "Intra-Area Prefix" }, 341 { LS_TYPE_INTRA_ATE, "Intra-Area TE" }, 342 { LS_TYPE_GRACE, "Grace" }, 343 { LS_TYPE_RI, "Router Information" }, 344 { LS_TYPE_INTER_ASTE, "Inter-AS-TE" }, 345 { LS_TYPE_L1VPN, "Layer 1 VPN" }, 346 { 0, NULL } 347 }; 348 349 static const struct tok ospf6_ls_scope_values[] = { 350 { LS_SCOPE_LINKLOCAL, "Link Local" }, 351 { LS_SCOPE_AREA, "Area Local" }, 352 { LS_SCOPE_AS, "Domain Wide" }, 353 { 0, NULL } 354 }; 355 356 static const struct tok ospf6_dd_flag_values[] = { 357 { OSPF6_DB_INIT, "Init" }, 358 { OSPF6_DB_MORE, "More" }, 359 { OSPF6_DB_MASTER, "Master" }, 360 { OSPF6_DB_M6, "IPv6 MTU" }, 361 { 0, NULL } 362 }; 363 364 static const struct tok ospf6_lsa_prefix_option_values[] = { 365 { LSA_PREFIX_OPT_NU, "No Unicast" }, 366 { LSA_PREFIX_OPT_LA, "Local address" }, 367 { LSA_PREFIX_OPT_MC, "Deprecated" }, 368 { LSA_PREFIX_OPT_P, "Propagate" }, 369 { LSA_PREFIX_OPT_DN, "Down" }, 370 { 0, NULL } 371 }; 372 373 static const struct tok ospf6_auth_type_str[] = { 374 { OSPF6_AUTH_TYPE_HMAC, "HMAC" }, 375 { 0, NULL } 376 }; 377 378 static void 379 ospf6_print_ls_type(netdissect_options *ndo, 380 register u_int ls_type, register const rtrid_t *ls_stateid) 381 { 382 ND_PRINT((ndo, "\n\t %s LSA (%d), %s Scope%s, LSA-ID %s", 383 tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK), 384 ls_type & LS_TYPE_MASK, 385 tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK), 386 ls_type &0x8000 ? ", transitive" : "", /* U-bit */ 387 ipaddr_string(ndo, ls_stateid))); 388 } 389 390 static int 391 ospf6_print_lshdr(netdissect_options *ndo, 392 register const struct lsa6_hdr *lshp, const u_char *dataend) 393 { 394 if ((u_char *)(lshp + 1) > dataend) 395 goto trunc; 396 ND_TCHECK(lshp->ls_type); 397 ND_TCHECK(lshp->ls_seq); 398 399 ND_PRINT((ndo, "\n\t Advertising Router %s, seq 0x%08x, age %us, length %u", 400 ipaddr_string(ndo, &lshp->ls_router), 401 EXTRACT_32BITS(&lshp->ls_seq), 402 EXTRACT_16BITS(&lshp->ls_age), 403 EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr))); 404 405 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid); 406 407 return (0); 408 trunc: 409 return (1); 410 } 411 412 static int 413 ospf6_print_lsaprefix(netdissect_options *ndo, 414 const uint8_t *tptr, u_int lsa_length) 415 { 416 const struct lsa6_prefix *lsapp = (struct lsa6_prefix *)tptr; 417 u_int wordlen; 418 struct in6_addr prefix; 419 420 if (lsa_length < sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES) 421 goto trunc; 422 lsa_length -= sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES; 423 ND_TCHECK2(*lsapp, sizeof (*lsapp) - IPV6_ADDR_LEN_BYTES); 424 wordlen = (lsapp->lsa_p_len + 31) / 32; 425 if (wordlen * 4 > sizeof(struct in6_addr)) { 426 ND_PRINT((ndo, " bogus prefixlen /%d", lsapp->lsa_p_len)); 427 goto trunc; 428 } 429 if (lsa_length < wordlen * 4) 430 goto trunc; 431 lsa_length -= wordlen * 4; 432 ND_TCHECK2(lsapp->lsa_p_prefix, wordlen * 4); 433 memset(&prefix, 0, sizeof(prefix)); 434 memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4); 435 ND_PRINT((ndo, "\n\t\t%s/%d", ip6addr_string(ndo, &prefix), 436 lsapp->lsa_p_len)); 437 if (lsapp->lsa_p_opt) { 438 ND_PRINT((ndo, ", Options [%s]", 439 bittok2str(ospf6_lsa_prefix_option_values, 440 "none", lsapp->lsa_p_opt))); 441 } 442 ND_PRINT((ndo, ", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric))); 443 return sizeof(*lsapp) - IPV6_ADDR_LEN_BYTES + wordlen * 4; 444 445 trunc: 446 return -1; 447 } 448 449 450 /* 451 * Print a single link state advertisement. If truncated return 1, else 0. 452 */ 453 static int 454 ospf6_print_lsa(netdissect_options *ndo, 455 register const struct lsa6 *lsap, const u_char *dataend) 456 { 457 register const struct rlalink6 *rlp; 458 #if 0 459 register const struct tos_metric *tosp; 460 #endif 461 register const rtrid_t *ap; 462 #if 0 463 register const struct aslametric *almp; 464 register const struct mcla *mcp; 465 #endif 466 register const struct llsa *llsap; 467 register const struct lsa6_prefix *lsapp; 468 #if 0 469 register const uint32_t *lp; 470 #endif 471 register u_int prefixes; 472 register int bytelen; 473 register u_int length, lsa_length; 474 uint32_t flags32; 475 const uint8_t *tptr; 476 477 if (ospf6_print_lshdr(ndo, &lsap->ls_hdr, dataend)) 478 return (1); 479 ND_TCHECK(lsap->ls_hdr.ls_length); 480 length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length); 481 482 /* 483 * The LSA length includes the length of the header; 484 * it must have a value that's at least that length. 485 * If it does, find the length of what follows the 486 * header. 487 */ 488 if (length < sizeof(struct lsa6_hdr) || (u_char *)lsap + length > dataend) 489 return (1); 490 lsa_length = length - sizeof(struct lsa6_hdr); 491 tptr = (uint8_t *)lsap+sizeof(struct lsa6_hdr); 492 493 switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) { 494 case LS_TYPE_ROUTER | LS_SCOPE_AREA: 495 if (lsa_length < sizeof (lsap->lsa_un.un_rla.rla_options)) 496 return (1); 497 lsa_length -= sizeof (lsap->lsa_un.un_rla.rla_options); 498 ND_TCHECK(lsap->lsa_un.un_rla.rla_options); 499 ND_PRINT((ndo, "\n\t Options [%s]", 500 bittok2str(ospf6_option_values, "none", 501 EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)))); 502 ND_PRINT((ndo, ", RLA-Flags [%s]", 503 bittok2str(ospf6_rla_flag_values, "none", 504 lsap->lsa_un.un_rla.rla_flags))); 505 506 rlp = lsap->lsa_un.un_rla.rla_link; 507 while (lsa_length != 0) { 508 if (lsa_length < sizeof (*rlp)) 509 return (1); 510 lsa_length -= sizeof (*rlp); 511 ND_TCHECK(*rlp); 512 switch (rlp->link_type) { 513 514 case RLA_TYPE_VIRTUAL: 515 ND_PRINT((ndo, "\n\t Virtual Link: Neighbor Router-ID %s" 516 "\n\t Neighbor Interface-ID %s, Interface %s", 517 ipaddr_string(ndo, &rlp->link_nrtid), 518 ipaddr_string(ndo, &rlp->link_nifid), 519 ipaddr_string(ndo, &rlp->link_ifid))); 520 break; 521 522 case RLA_TYPE_ROUTER: 523 ND_PRINT((ndo, "\n\t Neighbor Router-ID %s" 524 "\n\t Neighbor Interface-ID %s, Interface %s", 525 ipaddr_string(ndo, &rlp->link_nrtid), 526 ipaddr_string(ndo, &rlp->link_nifid), 527 ipaddr_string(ndo, &rlp->link_ifid))); 528 break; 529 530 case RLA_TYPE_TRANSIT: 531 ND_PRINT((ndo, "\n\t Neighbor Network-ID %s" 532 "\n\t Neighbor Interface-ID %s, Interface %s", 533 ipaddr_string(ndo, &rlp->link_nrtid), 534 ipaddr_string(ndo, &rlp->link_nifid), 535 ipaddr_string(ndo, &rlp->link_ifid))); 536 break; 537 538 default: 539 ND_PRINT((ndo, "\n\t Unknown Router Links Type 0x%02x", 540 rlp->link_type)); 541 return (0); 542 } 543 ND_PRINT((ndo, ", metric %d", EXTRACT_16BITS(&rlp->link_metric))); 544 rlp++; 545 } 546 break; 547 548 case LS_TYPE_NETWORK | LS_SCOPE_AREA: 549 if (lsa_length < sizeof (lsap->lsa_un.un_nla.nla_options)) 550 return (1); 551 lsa_length -= sizeof (lsap->lsa_un.un_nla.nla_options); 552 ND_TCHECK(lsap->lsa_un.un_nla.nla_options); 553 ND_PRINT((ndo, "\n\t Options [%s]", 554 bittok2str(ospf6_option_values, "none", 555 EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)))); 556 557 ND_PRINT((ndo, "\n\t Connected Routers:")); 558 ap = lsap->lsa_un.un_nla.nla_router; 559 while (lsa_length != 0) { 560 if (lsa_length < sizeof (*ap)) 561 return (1); 562 lsa_length -= sizeof (*ap); 563 ND_TCHECK(*ap); 564 ND_PRINT((ndo, "\n\t\t%s", ipaddr_string(ndo, ap))); 565 ++ap; 566 } 567 break; 568 569 case LS_TYPE_INTER_AP | LS_SCOPE_AREA: 570 if (lsa_length < sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric)) 571 return (1); 572 lsa_length -= sizeof (lsap->lsa_un.un_inter_ap.inter_ap_metric); 573 ND_TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric); 574 ND_PRINT((ndo, ", metric %u", 575 EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC)); 576 577 tptr = (uint8_t *)lsap->lsa_un.un_inter_ap.inter_ap_prefix; 578 while (lsa_length != 0) { 579 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 580 if (bytelen < 0) 581 goto trunc; 582 lsa_length -= bytelen; 583 tptr += bytelen; 584 } 585 break; 586 587 case LS_TYPE_ASE | LS_SCOPE_AS: 588 if (lsa_length < sizeof (lsap->lsa_un.un_asla.asla_metric)) 589 return (1); 590 lsa_length -= sizeof (lsap->lsa_un.un_asla.asla_metric); 591 ND_TCHECK(lsap->lsa_un.un_asla.asla_metric); 592 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric); 593 ND_PRINT((ndo, "\n\t Flags [%s]", 594 bittok2str(ospf6_asla_flag_values, "none", flags32))); 595 ND_PRINT((ndo, " metric %u", 596 EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) & 597 ASLA_MASK_METRIC)); 598 599 tptr = (uint8_t *)lsap->lsa_un.un_asla.asla_prefix; 600 lsapp = (struct lsa6_prefix *)tptr; 601 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 602 if (bytelen < 0) 603 goto trunc; 604 lsa_length -= bytelen; 605 tptr += bytelen; 606 607 if ((flags32 & ASLA_FLAG_FWDADDR) != 0) { 608 struct in6_addr *fwdaddr6; 609 610 fwdaddr6 = (struct in6_addr *)tptr; 611 if (lsa_length < sizeof (*fwdaddr6)) 612 return (1); 613 lsa_length -= sizeof (*fwdaddr6); 614 ND_TCHECK(*fwdaddr6); 615 ND_PRINT((ndo, " forward %s", 616 ip6addr_string(ndo, fwdaddr6))); 617 tptr += sizeof(*fwdaddr6); 618 } 619 620 if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) { 621 if (lsa_length < sizeof (uint32_t)) 622 return (1); 623 lsa_length -= sizeof (uint32_t); 624 ND_TCHECK(*(uint32_t *)tptr); 625 ND_PRINT((ndo, " tag %s", 626 ipaddr_string(ndo, (uint32_t *)tptr))); 627 tptr += sizeof(uint32_t); 628 } 629 630 if (lsapp->lsa_p_metric) { 631 if (lsa_length < sizeof (uint32_t)) 632 return (1); 633 lsa_length -= sizeof (uint32_t); 634 ND_TCHECK(*(uint32_t *)tptr); 635 ND_PRINT((ndo, " RefLSID: %s", 636 ipaddr_string(ndo, (uint32_t *)tptr))); 637 tptr += sizeof(uint32_t); 638 } 639 break; 640 641 case LS_TYPE_LINK: 642 /* Link LSA */ 643 llsap = &lsap->lsa_un.un_llsa; 644 if (lsa_length < sizeof (llsap->llsa_priandopt)) 645 return (1); 646 lsa_length -= sizeof (llsap->llsa_priandopt); 647 ND_TCHECK(llsap->llsa_priandopt); 648 ND_PRINT((ndo, "\n\t Options [%s]", 649 bittok2str(ospf6_option_values, "none", 650 EXTRACT_32BITS(&llsap->llsa_options)))); 651 652 if (lsa_length < sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix)) 653 return (1); 654 lsa_length -= sizeof (llsap->llsa_lladdr) + sizeof (llsap->llsa_nprefix); 655 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix); 656 ND_PRINT((ndo, "\n\t Priority %d, Link-local address %s, Prefixes %d:", 657 llsap->llsa_priority, 658 ip6addr_string(ndo, &llsap->llsa_lladdr), 659 prefixes)); 660 661 tptr = (uint8_t *)llsap->llsa_prefix; 662 while (prefixes > 0) { 663 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 664 if (bytelen < 0) 665 goto trunc; 666 prefixes--; 667 lsa_length -= bytelen; 668 tptr += bytelen; 669 } 670 break; 671 672 case LS_TYPE_INTRA_AP | LS_SCOPE_AREA: 673 /* Intra-Area-Prefix LSA */ 674 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid)) 675 return (1); 676 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_rtid); 677 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid); 678 ospf6_print_ls_type(ndo, 679 EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype), 680 &lsap->lsa_un.un_intra_ap.intra_ap_lsid); 681 682 if (lsa_length < sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix)) 683 return (1); 684 lsa_length -= sizeof (lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 685 ND_TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 686 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix); 687 ND_PRINT((ndo, "\n\t Prefixes %d:", prefixes)); 688 689 tptr = (uint8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix; 690 while (prefixes > 0) { 691 bytelen = ospf6_print_lsaprefix(ndo, tptr, lsa_length); 692 if (bytelen < 0) 693 goto trunc; 694 prefixes--; 695 lsa_length -= bytelen; 696 tptr += bytelen; 697 } 698 break; 699 700 case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL: 701 if (ospf_print_grace_lsa(ndo, tptr, lsa_length) == -1) { 702 return 1; 703 } 704 break; 705 706 case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL: 707 if (ospf_print_te_lsa(ndo, tptr, lsa_length) == -1) { 708 return 1; 709 } 710 break; 711 712 default: 713 if(!print_unknown_data(ndo,tptr, 714 "\n\t ", 715 lsa_length)) { 716 return (1); 717 } 718 break; 719 } 720 721 return (0); 722 trunc: 723 return (1); 724 } 725 726 static int 727 ospf6_decode_v3(netdissect_options *ndo, 728 register const struct ospf6hdr *op, 729 register const u_char *dataend) 730 { 731 register const rtrid_t *ap; 732 register const struct lsr6 *lsrp; 733 register const struct lsa6_hdr *lshp; 734 register const struct lsa6 *lsap; 735 register int i; 736 737 switch (op->ospf6_type) { 738 739 case OSPF_TYPE_HELLO: { 740 register const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN); 741 742 ND_PRINT((ndo, "\n\tOptions [%s]", 743 bittok2str(ospf6_option_values, "none", 744 EXTRACT_32BITS(&hellop->hello_options)))); 745 746 ND_TCHECK(hellop->hello_deadint); 747 ND_PRINT((ndo, "\n\t Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u", 748 EXTRACT_16BITS(&hellop->hello_helloint), 749 EXTRACT_16BITS(&hellop->hello_deadint), 750 ipaddr_string(ndo, &hellop->hello_ifid), 751 hellop->hello_priority)); 752 753 ND_TCHECK(hellop->hello_dr); 754 if (EXTRACT_32BITS(&hellop->hello_dr) != 0) 755 ND_PRINT((ndo, "\n\t Designated Router %s", 756 ipaddr_string(ndo, &hellop->hello_dr))); 757 ND_TCHECK(hellop->hello_bdr); 758 if (EXTRACT_32BITS(&hellop->hello_bdr) != 0) 759 ND_PRINT((ndo, ", Backup Designated Router %s", 760 ipaddr_string(ndo, &hellop->hello_bdr))); 761 if (ndo->ndo_vflag > 1) { 762 ND_PRINT((ndo, "\n\t Neighbor List:")); 763 ap = hellop->hello_neighbor; 764 while ((u_char *)ap < dataend) { 765 ND_TCHECK(*ap); 766 ND_PRINT((ndo, "\n\t %s", ipaddr_string(ndo, ap))); 767 ++ap; 768 } 769 } 770 break; /* HELLO */ 771 } 772 773 case OSPF_TYPE_DD: { 774 register const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN); 775 776 ND_TCHECK(ddp->db_options); 777 ND_PRINT((ndo, "\n\tOptions [%s]", 778 bittok2str(ospf6_option_values, "none", 779 EXTRACT_32BITS(&ddp->db_options)))); 780 ND_TCHECK(ddp->db_flags); 781 ND_PRINT((ndo, ", DD Flags [%s]", 782 bittok2str(ospf6_dd_flag_values,"none",ddp->db_flags))); 783 784 ND_TCHECK(ddp->db_seq); 785 ND_PRINT((ndo, ", MTU %u, DD-Sequence 0x%08x", 786 EXTRACT_16BITS(&ddp->db_mtu), 787 EXTRACT_32BITS(&ddp->db_seq))); 788 if (ndo->ndo_vflag > 1) { 789 /* Print all the LS adv's */ 790 lshp = ddp->db_lshdr; 791 while ((u_char *)lshp < dataend) { 792 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 793 goto trunc; 794 } 795 } 796 break; 797 } 798 799 case OSPF_TYPE_LS_REQ: 800 if (ndo->ndo_vflag > 1) { 801 lsrp = (const struct lsr6 *)((uint8_t *)op + OSPF6HDR_LEN); 802 while ((u_char *)lsrp < dataend) { 803 ND_TCHECK(*lsrp); 804 ND_PRINT((ndo, "\n\t Advertising Router %s", 805 ipaddr_string(ndo, &lsrp->ls_router))); 806 ospf6_print_ls_type(ndo, EXTRACT_16BITS(&lsrp->ls_type), 807 &lsrp->ls_stateid); 808 ++lsrp; 809 } 810 } 811 break; 812 813 case OSPF_TYPE_LS_UPDATE: 814 if (ndo->ndo_vflag > 1) { 815 register const struct lsu6 *lsup = (const struct lsu6 *)((uint8_t *)op + OSPF6HDR_LEN); 816 817 ND_TCHECK(lsup->lsu_count); 818 i = EXTRACT_32BITS(&lsup->lsu_count); 819 lsap = lsup->lsu_lsa; 820 while ((u_char *)lsap < dataend && i--) { 821 if (ospf6_print_lsa(ndo, lsap, dataend)) 822 goto trunc; 823 lsap = (struct lsa6 *)((u_char *)lsap + 824 EXTRACT_16BITS(&lsap->ls_hdr.ls_length)); 825 } 826 } 827 break; 828 829 case OSPF_TYPE_LS_ACK: 830 if (ndo->ndo_vflag > 1) { 831 lshp = (const struct lsa6_hdr *)((uint8_t *)op + OSPF6HDR_LEN); 832 while ((u_char *)lshp < dataend) { 833 if (ospf6_print_lshdr(ndo, lshp++, dataend)) 834 goto trunc; 835 } 836 } 837 break; 838 839 default: 840 break; 841 } 842 return (0); 843 trunc: 844 return (1); 845 } 846 847 /* RFC5613 Section 2.2 (w/o the TLVs) */ 848 static int 849 ospf6_print_lls(netdissect_options *ndo, 850 const u_char *cp, const u_int len) 851 { 852 uint16_t llsdatalen; 853 854 if (len == 0) 855 return 0; 856 if (len < OSPF_LLS_HDRLEN) 857 goto trunc; 858 /* Checksum */ 859 ND_TCHECK2(*cp, 2); 860 ND_PRINT((ndo, "\n\tLLS Checksum 0x%04x", EXTRACT_16BITS(cp))); 861 cp += 2; 862 /* LLS Data Length */ 863 ND_TCHECK2(*cp, 2); 864 llsdatalen = EXTRACT_16BITS(cp); 865 ND_PRINT((ndo, ", Data Length %u", llsdatalen)); 866 if (llsdatalen < OSPF_LLS_HDRLEN || llsdatalen > len) 867 goto trunc; 868 cp += 2; 869 /* LLS TLVs */ 870 ND_TCHECK2(*cp, llsdatalen - OSPF_LLS_HDRLEN); 871 /* FIXME: code in print-ospf.c can be reused to decode the TLVs */ 872 873 return llsdatalen; 874 trunc: 875 return -1; 876 } 877 878 /* RFC6506 Section 4.1 */ 879 static int 880 ospf6_decode_at(netdissect_options *ndo, 881 const u_char *cp, const u_int len) 882 { 883 uint16_t authdatalen; 884 885 if (len == 0) 886 return 0; 887 if (len < OSPF6_AT_HDRLEN) 888 goto trunc; 889 /* Authentication Type */ 890 ND_TCHECK2(*cp, 2); 891 ND_PRINT((ndo, "\n\tAuthentication Type %s", tok2str(ospf6_auth_type_str, "unknown (0x%04x)", EXTRACT_16BITS(cp)))); 892 cp += 2; 893 /* Auth Data Len */ 894 ND_TCHECK2(*cp, 2); 895 authdatalen = EXTRACT_16BITS(cp); 896 ND_PRINT((ndo, ", Length %u", authdatalen)); 897 if (authdatalen < OSPF6_AT_HDRLEN || authdatalen > len) 898 goto trunc; 899 cp += 2; 900 /* Reserved */ 901 ND_TCHECK2(*cp, 2); 902 cp += 2; 903 /* Security Association ID */ 904 ND_TCHECK2(*cp, 2); 905 ND_PRINT((ndo, ", SAID %u", EXTRACT_16BITS(cp))); 906 cp += 2; 907 /* Cryptographic Sequence Number (High-Order 32 Bits) */ 908 ND_TCHECK2(*cp, 4); 909 ND_PRINT((ndo, ", CSN 0x%08x", EXTRACT_32BITS(cp))); 910 cp += 4; 911 /* Cryptographic Sequence Number (Low-Order 32 Bits) */ 912 ND_TCHECK2(*cp, 4); 913 ND_PRINT((ndo, ":%08x", EXTRACT_32BITS(cp))); 914 cp += 4; 915 /* Authentication Data */ 916 ND_TCHECK2(*cp, authdatalen - OSPF6_AT_HDRLEN); 917 if (ndo->ndo_vflag > 1) 918 print_unknown_data(ndo,cp, "\n\tAuthentication Data ", authdatalen - OSPF6_AT_HDRLEN); 919 return 0; 920 921 trunc: 922 return 1; 923 } 924 925 /* The trailing data may include LLS and/or AT data (in this specific order). 926 * LLS data may be present only in Hello and DBDesc packets with the L-bit set. 927 * AT data may be present in Hello and DBDesc packets with the AT-bit set or in 928 * any other packet type, thus decode the AT data regardless of the AT-bit. 929 */ 930 static int 931 ospf6_decode_v3_trailer(netdissect_options *ndo, 932 const struct ospf6hdr *op, const u_char *cp, const unsigned len) 933 { 934 int llslen = 0; 935 int lls_hello = 0; 936 int lls_dd = 0; 937 938 if (op->ospf6_type == OSPF_TYPE_HELLO) { 939 const struct hello6 *hellop = (const struct hello6 *)((uint8_t *)op + OSPF6HDR_LEN); 940 if (EXTRACT_32BITS(&hellop->hello_options) & OSPF6_OPTION_L) 941 lls_hello = 1; 942 } else if (op->ospf6_type == OSPF_TYPE_DD) { 943 const struct dd6 *ddp = (const struct dd6 *)((uint8_t *)op + OSPF6HDR_LEN); 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 = (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
Indexes created Mon Mar 16 00:23:04 UTC 2026