contrib/tcpdump/print-ospf6.c

   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 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-ospf6.c,v 1.15 2006-09-13 06:31:11 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #include "interface.h"
  39 #include "addrtoname.h"
  40 #include "extract.h"
  41
  42 #include "ospf.h"
  43 #include "ospf6.h"
  44
  45 static const struct tok ospf6_option_values[] = {
  46         { OSPF6_OPTION_V6,      "V6" },
  47         { OSPF6_OPTION_E,       "External" },
  48         { OSPF6_OPTION_MC,      "Multicast" },
  49         { OSPF6_OPTION_N,       "NSSA" },
  50         { OSPF6_OPTION_R,       "Router" },
  51         { OSPF6_OPTION_DC,      "Demand Circuit" },
  52         { 0,                    NULL }
  53 };
  54
  55 static const struct tok ospf6_rla_flag_values[] = {
  56         { RLA_FLAG_B,           "ABR" },
  57         { RLA_FLAG_E,           "External" },
  58         { RLA_FLAG_V,           "Virtual-Link Endpoint" },
  59         { RLA_FLAG_W,           "Wildcard Receiver" },
  60         { RLA_FLAG_N,           "NSSA Translator" },
  61         { 0,                    NULL }
  62 };
  63
  64 static const struct tok ospf6_asla_flag_values[] = {
  65         { ASLA_FLAG_EXTERNAL,   "External Type 2" },
  66         { ASLA_FLAG_FWDADDR,    "Fforwarding" },
  67         { ASLA_FLAG_ROUTETAG,   "Tag" },
  68         { 0,                    NULL }
  69 };
  70
  71 static struct tok ospf6_type_values[] = {
  72         { OSPF_TYPE_HELLO,      "Hello" },
  73         { OSPF_TYPE_DD,         "Database Description" },
  74         { OSPF_TYPE_LS_REQ,     "LS-Request" },
  75         { OSPF_TYPE_LS_UPDATE,  "LS-Update" },
  76         { OSPF_TYPE_LS_ACK,     "LS-Ack" },
  77         { 0,                    NULL }
  78 };
  79
  80 static struct tok ospf6_lsa_values[] = {
  81         { LS_TYPE_ROUTER,       "Router" },
  82         { LS_TYPE_NETWORK,      "Network" },
  83         { LS_TYPE_INTER_AP,     "Inter-Area Prefix" },
  84         { LS_TYPE_INTER_AR,     "Inter-Area Router" },
  85         { LS_TYPE_ASE,          "External" },
  86         { LS_TYPE_GROUP,        "Multicast Group" },
  87         { LS_TYPE_NSSA,         "NSSA" },
  88         { LS_TYPE_LINK,         "Link" },
  89         { LS_TYPE_INTRA_AP,     "Intra-Area Prefix" },
  90         { LS_TYPE_INTRA_ATE,    "Intra-Area TE" },
  91         { LS_TYPE_GRACE,        "Grace" },
  92         { 0,                    NULL }
  93 };
  94
  95 static struct tok ospf6_ls_scope_values[] = {
  96         { LS_SCOPE_LINKLOCAL,   "Link Local" },
  97         { LS_SCOPE_AREA,        "Area Local" },
  98         { LS_SCOPE_AS,          "Domain Wide" },
  99         { 0,                    NULL }
 100 };
 101
 102 static struct tok ospf6_dd_flag_values[] = {
 103         { OSPF6_DB_INIT,        "Init" },
 104         { OSPF6_DB_MORE,        "More" },
 105         { OSPF6_DB_MASTER,      "Master" },
 106         { 0,                    NULL }
 107 };
 108
 109 static struct tok ospf6_lsa_prefix_option_values[] = {
 110         { LSA_PREFIX_OPT_NU, "No Unicast" },
 111         { LSA_PREFIX_OPT_LA, "Local address" },
 112         { LSA_PREFIX_OPT_MC, "Multicast" },
 113         { LSA_PREFIX_OPT_P, "Propagate" },
 114         { LSA_PREFIX_OPT_DN, "Down" },
 115         { 0, NULL }
 116 };
 117
 118 static char tstr[] = " [|ospf3]";
 119
 120 #ifdef WIN32
 121 #define inline __inline
 122 #endif /* WIN32 */
 123
 124 /* Forwards */
 125 static void ospf6_print_ls_type(u_int, const rtrid_t *);
 126 static int ospf6_print_lshdr(const struct lsa6_hdr *);
 127 static int ospf6_print_lsa(const struct lsa6 *);
 128 static int ospf6_decode_v3(const struct ospf6hdr *, const u_char *);
 129
 130
 131 static void
 132 ospf6_print_ls_type(register u_int ls_type, register const rtrid_t *ls_stateid)
 133 {
 134         printf("\n\t    %s LSA (%d), %s Scope%s, LSA-ID %s",
 135                tok2str(ospf6_lsa_values, "Unknown", ls_type & LS_TYPE_MASK),
 136                ls_type & LS_TYPE_MASK,
 137                tok2str(ospf6_ls_scope_values, "Unknown", ls_type & LS_SCOPE_MASK),
 138                ls_type &0x8000 ? ", transitive" : "", /* U-bit */
 139                ipaddr_string(ls_stateid));
 140 }
 141
 142 static int
 143 ospf6_print_lshdr(register const struct lsa6_hdr *lshp)
 144 {
 145
 146         TCHECK(lshp->ls_type);
 147         TCHECK(lshp->ls_seq);
 148
 149         printf("\n\t  Advertising Router %s, seq 0x%08x, age %us, length %u",
 150                ipaddr_string(&lshp->ls_router),
 151                EXTRACT_32BITS(&lshp->ls_seq),
 152                EXTRACT_16BITS(&lshp->ls_age),
 153                EXTRACT_16BITS(&lshp->ls_length)-(u_int)sizeof(struct lsa6_hdr));
 154
 155         ospf6_print_ls_type(EXTRACT_16BITS(&lshp->ls_type), &lshp->ls_stateid);
 156
 157         return (0);
 158 trunc:
 159         return (1);
 160 }
 161
 162 static int
 163 ospf6_print_lsaprefix(register const struct lsa6_prefix *lsapp)
 164 {
 165         u_int wordlen;
 166         struct in6_addr prefix;
 167
 168         TCHECK(*lsapp);
 169         wordlen = (lsapp->lsa_p_len + 31) / 32;
 170         if (wordlen * 4 > sizeof(struct in6_addr)) {
 171                 printf(" bogus prefixlen /%d", lsapp->lsa_p_len);
 172                 goto trunc;
 173         }
 174         memset(&prefix, 0, sizeof(prefix));
 175         memcpy(&prefix, lsapp->lsa_p_prefix, wordlen * 4);
 176         printf("\n\t\t%s/%d", ip6addr_string(&prefix),
 177                 lsapp->lsa_p_len);
 178         if (lsapp->lsa_p_opt) {
 179             printf(", Options [%s]",
 180                    bittok2str(ospf6_lsa_prefix_option_values,
 181                               "none", lsapp->lsa_p_opt));
 182         }
 183         printf(", metric %u", EXTRACT_16BITS(&lsapp->lsa_p_metric));
 184         return sizeof(*lsapp) - 4 + wordlen * 4;
 185
 186 trunc:
 187         return -1;
 188 }
 189
 190
 191 /*
 192  * Print a single link state advertisement.  If truncated return 1, else 0.
 193  */
 194 static int
 195 ospf6_print_lsa(register const struct lsa6 *lsap)
 196 {
 197         register const u_char *ls_end, *ls_opt;
 198         register const struct rlalink6 *rlp;
 199 #if 0
 200         register const struct tos_metric *tosp;
 201 #endif
 202         register const rtrid_t *ap;
 203 #if 0
 204         register const struct aslametric *almp;
 205         register const struct mcla *mcp;
 206 #endif
 207         register const struct llsa *llsap;
 208         register const struct lsa6_prefix *lsapp;
 209 #if 0
 210         register const u_int32_t *lp;
 211 #endif
 212         register u_int prefixes;
 213         register int bytelen, length, lsa_length;
 214         u_int32_t flags32;
 215         u_int8_t *tptr;
 216
 217         if (ospf6_print_lshdr(&lsap->ls_hdr))
 218                 return (1);
 219         TCHECK(lsap->ls_hdr.ls_length);
 220         length = EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
 221         lsa_length = length - sizeof(struct lsa6_hdr);
 222         ls_end = (u_char *)lsap + length;
 223         tptr = (u_int8_t *)lsap+sizeof(struct lsa6_hdr);
 224
 225         switch (EXTRACT_16BITS(&lsap->ls_hdr.ls_type)) {
 226         case LS_TYPE_ROUTER | LS_SCOPE_AREA:
 227                 TCHECK(lsap->lsa_un.un_rla.rla_options);
 228                 printf("\n\t      Options [%s]",
 229                        bittok2str(ospf6_option_values, "none",
 230                                   EXTRACT_32BITS(&lsap->lsa_un.un_rla.rla_options)));
 231
 232                 TCHECK(lsap->lsa_un.un_rla.rla_flags);
 233                 printf(", RLA-Flags [%s]",
 234                        bittok2str(ospf6_rla_flag_values, "none",
 235                                   lsap->lsa_un.un_rla.rla_flags));
 236
 237
 238                 TCHECK(lsap->lsa_un.un_rla.rla_link);
 239                 rlp = lsap->lsa_un.un_rla.rla_link;
 240                 while (rlp + 1 <= (struct rlalink6 *)ls_end) {
 241                         TCHECK(*rlp);
 242                         switch (rlp->link_type) {
 243
 244                         case RLA_TYPE_VIRTUAL:
 245                                 printf("\n\t      Virtual Link: Neighbor Router-ID %s"
 246                                        "\n\t      Neighbor Interface-ID %s, Interface %s",
 247                                        ipaddr_string(&rlp->link_nrtid),
 248                                        ipaddr_string(&rlp->link_nifid),
 249                                        ipaddr_string(&rlp->link_ifid));
 250                                 break;
 251
 252                         case RLA_TYPE_ROUTER:
 253                                 printf("\n\t      Neighbor Router-ID %s"
 254                                        "\n\t      Neighbor Interface-ID %s, Interface %s",
 255                                        ipaddr_string(&rlp->link_nrtid),
 256                                        ipaddr_string(&rlp->link_nifid),
 257                                        ipaddr_string(&rlp->link_ifid));
 258                                 break;
 259
 260                         case RLA_TYPE_TRANSIT:
 261                                 printf("\n\t      Neighbor Network-ID %s"
 262                                        "\n\t      Neighbor Interface-ID %s, Interface %s",
 263                                     ipaddr_string(&rlp->link_nrtid),
 264                                     ipaddr_string(&rlp->link_nifid),
 265                                     ipaddr_string(&rlp->link_ifid));
 266                                 break;
 267
 268                         default:
 269                                 printf("\n\t      Unknown Router Links Type 0x%02x",
 270                                     rlp->link_type);
 271                                 return (0);
 272                         }
 273                         printf(", metric %d", EXTRACT_16BITS(&rlp->link_metric));
 274                         rlp++;
 275                 }
 276                 break;
 277
 278         case LS_TYPE_NETWORK | LS_SCOPE_AREA:
 279                 TCHECK(lsap->lsa_un.un_nla.nla_options);
 280                 printf("\n\t      Options [%s]",
 281                        bittok2str(ospf6_option_values, "none",
 282                                   EXTRACT_32BITS(&lsap->lsa_un.un_nla.nla_options)));
 283                 printf("\n\t      Connected Routers:");
 284                 ap = lsap->lsa_un.un_nla.nla_router;
 285                 while ((u_char *)ap < ls_end) {
 286                         TCHECK(*ap);
 287                         printf("\n\t\t%s", ipaddr_string(ap));
 288                         ++ap;
 289                 }
 290                 break;
 291
 292         case LS_TYPE_INTER_AP | LS_SCOPE_AREA:
 293                 TCHECK(lsap->lsa_un.un_inter_ap.inter_ap_metric);
 294                 printf(", metric %u",
 295                         EXTRACT_32BITS(&lsap->lsa_un.un_inter_ap.inter_ap_metric) & SLA_MASK_METRIC);
 296                 lsapp = lsap->lsa_un.un_inter_ap.inter_ap_prefix;
 297                 while (lsapp + sizeof(lsapp) <= (struct lsa6_prefix *)ls_end) {
 298                         bytelen = ospf6_print_lsaprefix(lsapp);
 299                         if (bytelen)
 300                                 goto trunc;
 301                         lsapp = (struct lsa6_prefix *)(((u_char *)lsapp) + bytelen);
 302                 }
 303                 break;
 304         case LS_SCOPE_AS | LS_TYPE_ASE:
 305                 TCHECK(lsap->lsa_un.un_asla.asla_metric);
 306                 flags32 = EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric);
 307                 printf("\n\t     Flags [%s]",
 308                        bittok2str(ospf6_asla_flag_values, "none", flags32));
 309                 printf(" metric %u",
 310                        EXTRACT_32BITS(&lsap->lsa_un.un_asla.asla_metric) &
 311                        ASLA_MASK_METRIC);
 312                 lsapp = lsap->lsa_un.un_asla.asla_prefix;
 313                 bytelen = ospf6_print_lsaprefix(lsapp);
 314                 if (bytelen < 0)
 315                         goto trunc;
 316                 if ((ls_opt = (u_char *)(((u_char *)lsapp) + bytelen)) < ls_end) {
 317                         struct in6_addr *fwdaddr6;
 318
 319                         if ((flags32 & ASLA_FLAG_FWDADDR) != 0) {
 320                                 fwdaddr6 = (struct in6_addr *)ls_opt;
 321                                 TCHECK(*fwdaddr6);
 322                                 printf(" forward %s",
 323                                        ip6addr_string(fwdaddr6));
 324
 325                                 ls_opt += sizeof(struct in6_addr);
 326                         }
 327
 328                         if ((flags32 & ASLA_FLAG_ROUTETAG) != 0) {
 329                                 TCHECK(*(u_int32_t *)ls_opt);
 330                                 printf(" tag %s",
 331                                        ipaddr_string((u_int32_t *)ls_opt));
 332
 333                                 ls_opt += sizeof(u_int32_t);
 334                         }
 335
 336                         if (lsapp->lsa_p_metric) {
 337                                 TCHECK(*(u_int32_t *)ls_opt);
 338                                 printf(" RefLSID: %s",
 339                                        ipaddr_string((u_int32_t *)ls_opt));
 340
 341                                 ls_opt += sizeof(u_int32_t);
 342                         }
 343                 }
 344                 break;
 345
 346         case LS_TYPE_LINK:
 347                 /* Link LSA */
 348                 llsap = &lsap->lsa_un.un_llsa;
 349                 TCHECK(llsap->llsa_options);
 350                 printf("\n\t      Options [%s]",
 351                        bittok2str(ospf6_option_values, "none",
 352                                   EXTRACT_32BITS(&llsap->llsa_options)));
 353                 TCHECK(llsap->llsa_nprefix);
 354                 prefixes = EXTRACT_32BITS(&llsap->llsa_nprefix);
 355                 printf("\n\t      Priority %d, Link-local address %s, Prefixes %d:",
 356                        llsap->llsa_priority,
 357                        ip6addr_string(&llsap->llsa_lladdr),
 358                        prefixes);
 359
 360                 tptr = (u_int8_t *)llsap->llsa_prefix;
 361                 while (prefixes > 0) {
 362                     lsapp = (struct lsa6_prefix *)tptr;
 363                     if ((bytelen = ospf6_print_lsaprefix(lsapp)) == -1) {
 364                         goto trunc;
 365                     }
 366                     prefixes--;
 367                     tptr += bytelen;
 368                 }
 369                 break;
 370
 371         case LS_TYPE_INTRA_AP | LS_SCOPE_AREA:
 372                 /* Intra-Area-Prefix LSA */
 373                 TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_rtid);
 374                 ospf6_print_ls_type(
 375                         EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_lstype),
 376                         &lsap->lsa_un.un_intra_ap.intra_ap_lsid);
 377                 TCHECK(lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
 378                 prefixes = EXTRACT_16BITS(&lsap->lsa_un.un_intra_ap.intra_ap_nprefix);
 379                 printf("\n\t      Prefixes %d:", prefixes);
 380
 381                 tptr = (u_int8_t *)lsap->lsa_un.un_intra_ap.intra_ap_prefix;
 382
 383                 while (prefixes > 0) {
 384                     lsapp = (struct lsa6_prefix *)tptr;
 385                     if ((bytelen = ospf6_print_lsaprefix(lsapp)) == -1) {
 386                         goto trunc;
 387                     }
 388                     prefixes--;
 389                     tptr += bytelen;
 390                 }
 391                 break;
 392
 393         case LS_TYPE_GRACE | LS_SCOPE_LINKLOCAL:
 394                 if (ospf_print_grace_lsa(tptr, lsa_length) == -1) {
 395                     return 1;
 396                 }
 397
 398             break;
 399
 400         case LS_TYPE_INTRA_ATE | LS_SCOPE_LINKLOCAL:
 401             if (ospf_print_te_lsa(tptr, lsa_length) == -1) {
 402                 return 1;
 403             }
 404             break;
 405
 406         default:
 407             if(!print_unknown_data(tptr,
 408                                    "\n\t      ",
 409                                    lsa_length)) {
 410                 return (1);
 411             }
 412         }
 413
 414         return (0);
 415 trunc:
 416         return (1);
 417 }
 418
 419 static int
 420 ospf6_decode_v3(register const struct ospf6hdr *op,
 421     register const u_char *dataend)
 422 {
 423         register const rtrid_t *ap;
 424         register const struct lsr6 *lsrp;
 425         register const struct lsa6_hdr *lshp;
 426         register const struct lsa6 *lsap;
 427         register int i;
 428
 429         switch (op->ospf6_type) {
 430
 431         case OSPF_TYPE_HELLO:
 432                 printf("\n\tOptions [%s]",
 433                        bittok2str(ospf6_option_values, "none",
 434                                   EXTRACT_32BITS(&op->ospf6_hello.hello_options)));
 435
 436                 TCHECK(op->ospf6_hello.hello_deadint);
 437                 printf("\n\t  Hello Timer %us, Dead Timer %us, Interface-ID %s, Priority %u",
 438                        EXTRACT_16BITS(&op->ospf6_hello.hello_helloint),
 439                        EXTRACT_16BITS(&op->ospf6_hello.hello_deadint),
 440                        ipaddr_string(&op->ospf6_hello.hello_ifid),
 441                        op->ospf6_hello.hello_priority);
 442
 443                 TCHECK(op->ospf6_hello.hello_dr);
 444                 if (op->ospf6_hello.hello_dr != 0)
 445                         printf("\n\t  Designated Router %s",
 446                             ipaddr_string(&op->ospf6_hello.hello_dr));
 447                 TCHECK(op->ospf6_hello.hello_bdr);
 448                 if (op->ospf6_hello.hello_bdr != 0)
 449                         printf(", Backup Designated Router %s",
 450                             ipaddr_string(&op->ospf6_hello.hello_bdr));
 451                 if (vflag) {
 452                         printf("\n\t  Neighbor List:");
 453                         ap = op->ospf6_hello.hello_neighbor;
 454                         while ((u_char *)ap < dataend) {
 455                                 TCHECK(*ap);
 456                                 printf("\n\t    %s", ipaddr_string(ap));
 457                                 ++ap;
 458                         }
 459                 }
 460                 break;  /* HELLO */
 461
 462         case OSPF_TYPE_DD:
 463                 TCHECK(op->ospf6_db.db_options);
 464                 printf("\n\tOptions [%s]",
 465                        bittok2str(ospf6_option_values, "none",
 466                                   EXTRACT_32BITS(&op->ospf6_db.db_options)));
 467                 TCHECK(op->ospf6_db.db_flags);
 468                 printf(", DD Flags [%s]",
 469                        bittok2str(ospf6_dd_flag_values,"none",op->ospf6_db.db_flags));
 470
 471                 TCHECK(op->ospf6_db.db_seq);
 472                 printf(", MTU %u, DD-Sequence 0x%08x",
 473                        EXTRACT_16BITS(&op->ospf6_db.db_mtu),
 474                        EXTRACT_32BITS(&op->ospf6_db.db_seq));
 475
 476                 /* Print all the LS adv's */
 477                 lshp = op->ospf6_db.db_lshdr;
 478                 while (!ospf6_print_lshdr(lshp)) {
 479                     ++lshp;
 480                 }
 481                 break;
 482
 483         case OSPF_TYPE_LS_REQ:
 484                 if (vflag) {
 485                         lsrp = op->ospf6_lsr;
 486                         while ((u_char *)lsrp < dataend) {
 487                                 TCHECK(*lsrp);
 488                                 printf("\n\t  Advertising Router %s",
 489                                        ipaddr_string(&lsrp->ls_router));
 490                                 ospf6_print_ls_type(EXTRACT_16BITS(&lsrp->ls_type),
 491                                                     &lsrp->ls_stateid);
 492                                 ++lsrp;
 493                         }
 494                 }
 495                 break;
 496
 497         case OSPF_TYPE_LS_UPDATE:
 498                 if (vflag) {
 499                         lsap = op->ospf6_lsu.lsu_lsa;
 500                         TCHECK(op->ospf6_lsu.lsu_count);
 501                         i = EXTRACT_32BITS(&op->ospf6_lsu.lsu_count);
 502                         while (i--) {
 503                                 if (ospf6_print_lsa(lsap))
 504                                         goto trunc;
 505                                 lsap = (struct lsa6 *)((u_char *)lsap +
 506                                     EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
 507                         }
 508                 }
 509                 break;
 510
 511
 512         case OSPF_TYPE_LS_ACK:
 513                 if (vflag) {
 514                         lshp = op->ospf6_lsa.lsa_lshdr;
 515
 516                         while (!ospf6_print_lshdr(lshp)) {
 517                                 ++lshp;
 518                         }
 519                 }
 520                 break;
 521
 522         default:
 523                 break;
 524         }
 525         return (0);
 526 trunc:
 527         return (1);
 528 }
 529
 530 void
 531 ospf6_print(register const u_char *bp, register u_int length)
 532 {
 533         register const struct ospf6hdr *op;
 534         register const u_char *dataend;
 535         register const char *cp;
 536
 537         op = (struct ospf6hdr *)bp;
 538
 539         /* If the type is valid translate it, or just print the type */
 540         /* value.  If it's not valid, say so and return */
 541         TCHECK(op->ospf6_type);
 542         cp = tok2str(ospf6_type_values, "unknown LS-type", op->ospf6_type);
 543         printf("OSPFv%u, %s, length %d", op->ospf6_version, cp, length);
 544         if (*cp == 'u') {
 545                 return;
 546         }
 547
 548         if(!vflag) { /* non verbose - so lets bail out here */
 549                 return;
 550         }
 551
 552         TCHECK(op->ospf6_len);
 553         if (length != EXTRACT_16BITS(&op->ospf6_len)) {
 554                 printf(" [len %d]", EXTRACT_16BITS(&op->ospf6_len));
 555                 return;
 556         }
 557         dataend = bp + length;
 558
 559         /* Print the routerid if it is not the same as the source */
 560         TCHECK(op->ospf6_routerid);
 561         printf("\n\tRouter-ID %s", ipaddr_string(&op->ospf6_routerid));
 562
 563         TCHECK(op->ospf6_areaid);
 564         if (op->ospf6_areaid != 0)
 565                 printf(", Area %s", ipaddr_string(&op->ospf6_areaid));
 566         else
 567                 printf(", Backbone Area");
 568         TCHECK(op->ospf6_instanceid);
 569         if (op->ospf6_instanceid)
 570                 printf(", Instance %u", op->ospf6_instanceid);
 571
 572         /* Do rest according to version.         */
 573         switch (op->ospf6_version) {
 574
 575         case 3:
 576                 /* ospf version 3 */
 577                 if (ospf6_decode_v3(op, dataend))
 578                         goto trunc;
 579                 break;
 580
 581         default:
 582                 printf(" ospf [version %d]", op->ospf6_version);
 583                 break;
 584         }                       /* end switch on version */
 585
 586         return;
 587 trunc:
 588         fputs(tstr, stdout);
 589 }