The Tcpdump Group git mirrors - tcpdump/blob - print-ospf.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[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-ospf.c,v 1.37 2003-10-02 13:35:52 hannes 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
  37 #include "interface.h"
  38 #include "addrtoname.h"
  39 #include "extract.h"
  40
  41 #include "ospf.h"
  42
  43 #include "ip.h"
  44
  45 static struct tok ospf_option_values[] = {
  46         { OSPF_OPTION_T,        "TOS" },
  47         { OSPF_OPTION_E,        "External" },
  48         { OSPF_OPTION_MC,       "Multicast" },
  49         { OSPF_OPTION_NP,       "NSSA" },
  50         { OSPF_OPTION_EA,       "Advertise External" },
  51         { OSPF_OPTION_DC,       "Demand Circuit" },
  52         { OSPF_OPTION_O,        "Opaque" },
  53         { 0,                    NULL }
  54 };
  55
  56 static struct tok ospf_authtype_values[] = {
  57         { OSPF_AUTH_NONE,       "none" },
  58         { OSPF_AUTH_NONE,       "simple" },
  59         { OSPF_AUTH_MD5,        "MD5" },
  60         { 0,                    NULL }
  61 };
  62
  63 static struct tok ospf_rla_flag_values[] = {
  64         { RLA_FLAG_B,           "ABR" },
  65         { RLA_FLAG_E,           "ASBR" },
  66         { RLA_FLAG_W1,          "Virtual" },
  67         { RLA_FLAG_W2,          "W2" },
  68         { 0,                    NULL }
  69 };
  70
  71 static struct tok type2str[] = {
  72         { OSPF_TYPE_UMD,        "UMD" },
  73         { OSPF_TYPE_HELLO,      "Hello" },
  74         { OSPF_TYPE_DD,         "Database Description" },
  75         { OSPF_TYPE_LS_REQ,     "LS-Request" },
  76         { OSPF_TYPE_LS_UPDATE,  "LS-Update" },
  77         { OSPF_TYPE_LS_ACK,     "LS-Ack" },
  78         { 0,                    NULL }
  79 };
  80
  81 static struct tok lsa_values[] = {
  82         { LS_TYPE_ROUTER,       "Router" },
  83         { LS_TYPE_NETWORK,      "Network" },
  84         { LS_TYPE_SUM_IP,       "Summary" },
  85         { LS_TYPE_SUM_ABR,      "ASBR Summary" },
  86         { LS_TYPE_ASE,          "External" },
  87         { LS_TYPE_GROUP,        "Multicast Group" },
  88         { LS_TYPE_NSSA,         "NSSA" },
  89         { LS_TYPE_OPAQUE_LL,    "Link Local Opaque" },
  90         { LS_TYPE_OPAQUE_AL,    "Area Local Opaque" },
  91         { LS_TYPE_OPAQUE_DW,    "Domain Wide Opaque" },
  92         { 0,                    NULL }
  93 };
  94
  95 static struct tok ospf_dd_flag_values[] = {
  96         { OSPF_DB_INIT,         "Init" },
  97         { OSPF_DB_MORE,         "More" },
  98         { OSPF_DB_MASTER,       "Master" },
  99         { 0,                    NULL }
 100 };
 101
 102 static char tstr[] = " [|ospf]";
 103
 104 #ifdef WIN32
 105 #define inline __inline
 106 #endif /* WIN32 */
 107
 108 static int ospf_print_lshdr(const struct lsa_hdr *);
 109 static int ospf_print_lsa(const struct lsa *);
 110 static int ospf_decode_v2(const struct ospfhdr *, const u_char *);
 111
 112 static int
 113 ospf_print_lshdr(register const struct lsa_hdr *lshp) {
 114
 115         TCHECK(lshp->ls_type);
 116         TCHECK(lshp->ls_options);
 117
 118         printf("\n\t  %s LSA (%d), LSA-ID: %s, Advertising Router: %s, seq 0x%08x, age %us",
 119                tok2str(lsa_values,"unknown",lshp->ls_type),
 120                lshp->ls_type,
 121                ipaddr_string(&lshp->ls_stateid),
 122                ipaddr_string(&lshp->ls_router),
 123                EXTRACT_32BITS(&lshp->ls_seq),
 124                EXTRACT_16BITS(&lshp->ls_age));
 125         printf("\n\t    Options: %s", bittok2str(ospf_option_values,"none",lshp->ls_options));
 126
 127 return (0);
 128 trunc:
 129         return (1);
 130 }
 131
 132 /*
 133  * Print a single link state advertisement.  If truncated return 1, else 0.
 134  */
 135 static int
 136 ospf_print_lsa(register const struct lsa *lsap)
 137 {
 138         register const u_char *ls_end;
 139         register const struct rlalink *rlp;
 140         register const struct tos_metric *tosp;
 141         register const struct in_addr *ap;
 142         register const struct aslametric *almp;
 143         register const struct mcla *mcp;
 144         register const u_int32_t *lp;
 145         register int j, k;
 146
 147         printf("\n\t  %s LSA (%d), LSA-ID: %s, Advertising Router: %s, seq 0x%08x, age %us",
 148                tok2str(lsa_values,"unknown",lsap->ls_hdr.ls_type),
 149                lsap->ls_hdr.ls_type,
 150                ipaddr_string(&lsap->ls_hdr.ls_stateid),
 151                ipaddr_string(&lsap->ls_hdr.ls_router),
 152                EXTRACT_32BITS(&lsap->ls_hdr.ls_seq),
 153                EXTRACT_16BITS(&lsap->ls_hdr.ls_age));
 154         printf("\n\t    Options: %s", bittok2str(ospf_option_values,"none",lsap->ls_hdr.ls_options));
 155
 156         TCHECK(lsap->ls_hdr.ls_length);
 157         ls_end = (u_char *)lsap + EXTRACT_16BITS(&lsap->ls_hdr.ls_length);
 158         switch (lsap->ls_hdr.ls_type) {
 159
 160         case LS_TYPE_ROUTER:
 161                 TCHECK(lsap->lsa_un.un_rla.rla_flags);
 162                 printf("\n\t    Router LSA Options: %s", bittok2str(ospf_rla_flag_values,"unknown (%u)",lsap->lsa_un.un_rla.rla_flags));
 163
 164                 TCHECK(lsap->lsa_un.un_rla.rla_count);
 165                 j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
 166                 TCHECK(lsap->lsa_un.un_rla.rla_link);
 167                 rlp = lsap->lsa_un.un_rla.rla_link;
 168                 while (j--) {
 169                         TCHECK(*rlp);
 170                         switch (rlp->link_type) {
 171
 172                         case RLA_TYPE_VIRTUAL:
 173                                 printf("\n\t      Virtual Link: Neighbor-Router-ID: %s, Interface-IP: %s",
 174                                     ipaddr_string(&rlp->link_id),
 175                                     ipaddr_string(&rlp->link_data));
 176                                 break;
 177
 178                         case RLA_TYPE_ROUTER:
 179                                 printf("\n\t      Neighbor-Router-ID: %s, Interface-IP: %s",
 180                                     ipaddr_string(&rlp->link_id),
 181                                     ipaddr_string(&rlp->link_data));
 182                                 break;
 183
 184                         case RLA_TYPE_TRANSIT:
 185                                 printf("\n\t      Neighbor-Network-ID: %s, Interface-IP: %s",
 186                                     ipaddr_string(&rlp->link_id),
 187                                     ipaddr_string(&rlp->link_data));
 188                                 break;
 189
 190                         case RLA_TYPE_STUB:
 191                                 printf("\n\t      Stub-Network: %s, mask: %s",
 192                                     ipaddr_string(&rlp->link_id),
 193                                     ipaddr_string(&rlp->link_data));
 194                                 break;
 195
 196                         default:
 197                                 printf("\n\t      unknown Router Links Type (%u)",
 198                                     rlp->link_type);
 199                                 return (0);
 200                         }
 201                         printf(", tos 0, metric: %d", EXTRACT_16BITS(&rlp->link_tos0metric));
 202                         tosp = (struct tos_metric *)
 203                             ((sizeof rlp->link_tos0metric) + (u_char *) rlp);
 204                         for (k = 0; k < (int) rlp->link_toscount; ++k, ++tosp) {
 205                                 TCHECK(*tosp);
 206                                 printf(", tos %d, metric: %d",
 207                                     tosp->tos_type,
 208                                     EXTRACT_16BITS(&tosp->tos_metric));
 209                         }
 210                         rlp = (struct rlalink *)((u_char *)(rlp + 1) +
 211                             ((rlp->link_toscount) * sizeof(*tosp)));
 212                 }
 213                 break;
 214
 215         case LS_TYPE_NETWORK:
 216                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 217                 printf("\n\t    mask %s rtrs",
 218                     ipaddr_string(&lsap->lsa_un.un_nla.nla_mask));
 219                 ap = lsap->lsa_un.un_nla.nla_router;
 220                 while ((u_char *)ap < ls_end) {
 221                         TCHECK(*ap);
 222                         printf(" %s", ipaddr_string(ap));
 223                         ++ap;
 224                 }
 225                 break;
 226
 227         case LS_TYPE_SUM_IP:
 228                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 229                 printf("\n\t    mask %s",
 230                     ipaddr_string(&lsap->lsa_un.un_sla.sla_mask));
 231                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 232                 lp = lsap->lsa_un.un_sla.sla_tosmetric;
 233                 /* suppress tos if its not supported */
 234                 if(!((lsap->ls_hdr.ls_options)&OSPF_OPTION_T)) {
 235                     printf(", metric: %u", EXTRACT_32BITS(lp)&SLA_MASK_METRIC);
 236                     break;
 237                 }
 238                 while ((u_char *)lp < ls_end) {
 239                         register u_int32_t ul;
 240
 241                         TCHECK(*lp);
 242                         ul = EXTRACT_32BITS(lp);
 243                         printf(", tos %d metric %d",
 244                             (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
 245                             ul & SLA_MASK_METRIC);
 246                         ++lp;
 247                 }
 248                 break;
 249
 250         case LS_TYPE_SUM_ABR:
 251                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 252                 lp = lsap->lsa_un.un_sla.sla_tosmetric;
 253                 /* suppress tos if its not supported */
 254                 if(!((lsap->ls_hdr.ls_options)&OSPF_OPTION_T)) {
 255                     printf(", metric: %u", EXTRACT_32BITS(lp)&SLA_MASK_METRIC);
 256                     break;
 257                 }
 258                 while ((u_char *)lp < ls_end) {
 259                         register u_int32_t ul;
 260
 261                         TCHECK(*lp);
 262                         ul = EXTRACT_32BITS(lp);
 263                         printf(", tos %d metric %d",
 264                             (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
 265                             ul & SLA_MASK_METRIC);
 266                         ++lp;
 267                 }
 268                 break;
 269
 270         case LS_TYPE_ASE:
 271                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 272                 printf("\n\t    mask %s",
 273                     ipaddr_string(&lsap->lsa_un.un_asla.asla_mask));
 274
 275                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 276                 almp = lsap->lsa_un.un_asla.asla_metric;
 277                 while ((u_char *)almp < ls_end) {
 278                         register u_int32_t ul;
 279
 280                         TCHECK(almp->asla_tosmetric);
 281                         ul = EXTRACT_32BITS(&almp->asla_tosmetric);
 282                         printf(", type %d, tos %d metric:",
 283                             (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1,
 284                             (ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
 285                         if ((ul & ASLA_MASK_METRIC)==0xffffff)
 286                             printf(" infinite");
 287                         else
 288                             printf(" %d", (ul & ASLA_MASK_METRIC));
 289
 290                         TCHECK(almp->asla_forward);
 291                         if (almp->asla_forward.s_addr) {
 292                                 printf(", forward %s",
 293                                     ipaddr_string(&almp->asla_forward));
 294                         }
 295                         TCHECK(almp->asla_tag);
 296                         if (almp->asla_tag.s_addr) {
 297                                 printf(", tag %s",
 298                                     ipaddr_string(&almp->asla_tag));
 299                         }
 300                         ++almp;
 301                 }
 302                 break;
 303
 304         case LS_TYPE_GROUP:
 305                 /* Multicast extensions as of 23 July 1991 */
 306                 mcp = lsap->lsa_un.un_mcla;
 307                 while ((u_char *)mcp < ls_end) {
 308                         TCHECK(mcp->mcla_vid);
 309                         switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {
 310
 311                         case MCLA_VERTEX_ROUTER:
 312                                 printf("\n\t    Router Router-ID %s",
 313                                     ipaddr_string(&mcp->mcla_vid));
 314                                 break;
 315
 316                         case MCLA_VERTEX_NETWORK:
 317                                 printf("\n\t    Network Designated Router %s",
 318                                     ipaddr_string(&mcp->mcla_vid));
 319                                 break;
 320
 321                         default:
 322                                 printf("\n\t    unknown VertexType (%u)",
 323                                     EXTRACT_32BITS(&mcp->mcla_vtype));
 324                                 break;
 325                         }
 326                 ++mcp;
 327                 }
 328                 break;
 329
 330           /*
 331            * FIXME those are the defined LSAs that lack a decoder
 332            * you are welcome to contribute code ;-)
 333            */
 334
 335         case LS_TYPE_OPAQUE_LL:
 336         case LS_TYPE_OPAQUE_AL:
 337         case LS_TYPE_OPAQUE_DW:
 338
 339         default:
 340           if (vflag <= 1) {
 341             if(!print_unknown_data((u_char *)lsap->lsa_un.un_unknown,
 342                                    "\n\t    ", EXTRACT_16BITS(&lsap->ls_hdr.ls_length)-sizeof(struct lsa_hdr)))
 343               return(0);
 344           }
 345           break;
 346         }
 347
 348         /* do we want to see an additionally hexdump ? */
 349         if (vflag> 1) {
 350           if(!print_unknown_data((u_char *)lsap->lsa_un.un_unknown,
 351                                  "\n\t    ", EXTRACT_16BITS(&lsap->ls_hdr.ls_length)-sizeof(struct lsa_hdr)))
 352             return(0);
 353         }
 354
 355         return (0);
 356 trunc:
 357         return (1);
 358 }
 359
 360 static int
 361 ospf_decode_v2(register const struct ospfhdr *op,
 362     register const u_char *dataend)
 363 {
 364         register const struct in_addr *ap;
 365         register const struct lsr *lsrp;
 366         register const struct lsa_hdr *lshp;
 367         register const struct lsa *lsap;
 368         register int lsa_count;
 369
 370         switch (op->ospf_type) {
 371
 372         case OSPF_TYPE_UMD:
 373                 /*
 374                  * Rob Coltun's special monitoring packets;
 375                  * do nothing
 376                  */
 377                 break;
 378
 379         case OSPF_TYPE_HELLO:
 380                 TCHECK(op->ospf_hello.hello_deadint);
 381                 printf("\n\t  Hello Timer: %us, Dead Timer %us, mask: %s, Priority: %u",
 382                        EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
 383                        EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
 384                        ipaddr_string(&op->ospf_hello.hello_mask),
 385                        op->ospf_hello.hello_priority);
 386
 387                 printf("\n\t  Options: %s",
 388                        bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options));
 389
 390                 TCHECK(op->ospf_hello.hello_dr);
 391                 if (op->ospf_hello.hello_dr.s_addr != 0)
 392                         printf("\n\t  Designated Router %s",
 393                             ipaddr_string(&op->ospf_hello.hello_dr));
 394
 395                 TCHECK(op->ospf_hello.hello_bdr);
 396                 if (op->ospf_hello.hello_bdr.s_addr != 0)
 397                         printf(", Backup Designated Router %s",
 398                             ipaddr_string(&op->ospf_hello.hello_bdr));
 399
 400                 ap = op->ospf_hello.hello_neighbor;
 401                 if ((u_char *)ap < dataend)
 402                         printf("\n\t  Neighbor List:");
 403                 while ((u_char *)ap < dataend) {
 404                         TCHECK(*ap);
 405                         printf("\n\t    %s", ipaddr_string(ap));
 406                         ++ap;
 407                 }
 408                 break;  /* HELLO */
 409
 410         case OSPF_TYPE_DD:
 411                 TCHECK(op->ospf_db.db_options);
 412                 printf("\n\t  Options: %s",
 413                        bittok2str(ospf_option_values,"none",op->ospf_db.db_options));
 414                 TCHECK(op->ospf_db.db_flags);
 415                 printf("\n\t  DD Flags: %s",
 416                        bittok2str(ospf_dd_flag_values,"none",op->ospf_db.db_flags));
 417
 418                 if (vflag) {
 419                         /* Print all the LS adv's */
 420                         lshp = op->ospf_db.db_lshdr;
 421                         while (!ospf_print_lshdr(lshp)) {
 422                                 ++lshp;
 423                         }
 424                 }
 425                 break;
 426
 427         case OSPF_TYPE_LS_REQ:
 428                 lsrp = op->ospf_lsr;
 429                 while ((u_char *)lsrp < dataend) {
 430                         TCHECK(*lsrp);
 431
 432                         printf("\n\t  %s LSA (%d), LSA-ID: %s, Advertising Router: %s",
 433                                tok2str(lsa_values,"unknown",lsrp->ls_type),
 434                                lsrp->ls_type,
 435                                ipaddr_string(&lsrp->ls_stateid),
 436                                ipaddr_string(&lsrp->ls_router));
 437                         ++lsrp;
 438                 }
 439                 break;
 440
 441         case OSPF_TYPE_LS_UPDATE:
 442                 lsap = op->ospf_lsu.lsu_lsa;
 443                 TCHECK(op->ospf_lsu.lsu_count);
 444                 lsa_count = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
 445                 printf(", %d LSA%s",lsa_count, lsa_count > 1 ? "s" : "");
 446                 while (lsa_count--) {
 447                         if (ospf_print_lsa(lsap))
 448                                 goto trunc;
 449                         lsap = (struct lsa *)((u_char *)lsap +
 450                                               EXTRACT_16BITS(&lsap->ls_hdr.ls_length));
 451                 }
 452                 break;
 453
 454         case OSPF_TYPE_LS_ACK:
 455                 lshp = op->ospf_lsa.lsa_lshdr;
 456                 while (!ospf_print_lshdr(lshp)) {
 457                     ++lshp;
 458                 }
 459                 break;
 460
 461         default:
 462                 printf("v2 type (%d)", op->ospf_type);
 463                 break;
 464         }
 465         return (0);
 466 trunc:
 467         return (1);
 468 }
 469
 470 void
 471 ospf_print(register const u_char *bp, register u_int length,
 472     register const u_char *bp2)
 473 {
 474         register const struct ospfhdr *op;
 475         register const struct ip *ip;
 476         register const u_char *dataend;
 477         register const char *cp;
 478
 479         op = (struct ospfhdr *)bp;
 480         ip = (struct ip *)bp2;
 481
 482         /* XXX Before we do anything else, strip off the MD5 trailer */
 483         TCHECK(op->ospf_authtype);
 484         if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
 485                 length -= OSPF_AUTH_MD5_LEN;
 486                 snapend -= OSPF_AUTH_MD5_LEN;
 487         }
 488
 489         /* If the type is valid translate it, or just print the type */
 490         /* value.  If it's not valid, say so and return */
 491         TCHECK(op->ospf_type);
 492         cp = tok2str(type2str, "unknown LS-Type %d", op->ospf_type);
 493         printf("OSPFv%d %s length: %d", op->ospf_version, cp, length);
 494         if (*cp == 'u')
 495                 return;
 496
 497         if(!vflag) /* non verbose - so lets bail out here */
 498                 return;
 499
 500         TCHECK(op->ospf_len);
 501         if (length != EXTRACT_16BITS(&op->ospf_len)) {
 502                 printf(" [len %d]", EXTRACT_16BITS(&op->ospf_len));
 503                 return;
 504         }
 505         dataend = bp + length;
 506
 507         TCHECK(op->ospf_routerid);
 508         printf("\n\tRouter-ID: %s", ipaddr_string(&op->ospf_routerid));
 509
 510         TCHECK(op->ospf_areaid);
 511         if (op->ospf_areaid.s_addr != 0)
 512                 printf(", Area %s", ipaddr_string(&op->ospf_areaid));
 513         else
 514                 printf(", Backbone Area");
 515
 516         if (vflag) {
 517                 /* Print authentication data (should we really do this?) */
 518                 TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
 519
 520                 printf(", Authentication Type: %s (%u)",
 521                        tok2str(ospf_authtype_values,"unknown",EXTRACT_16BITS(&op->ospf_authtype)),
 522                        EXTRACT_16BITS(&op->ospf_authtype));
 523
 524                 switch (EXTRACT_16BITS(&op->ospf_authtype)) {
 525
 526                 case OSPF_AUTH_NONE:
 527                         break;
 528
 529                 case OSPF_AUTH_SIMPLE:
 530                         (void)fn_printn(op->ospf_authdata,
 531                             sizeof(op->ospf_authdata), NULL);
 532                         printf("\"");
 533                         break;
 534
 535                 case OSPF_AUTH_MD5:
 536                         printf("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
 537                                *((op->ospf_authdata)+2),
 538                                *((op->ospf_authdata)+3),
 539                                EXTRACT_32BITS((op->ospf_authdata)+4));
 540                         break;
 541
 542                 default:
 543                         return;
 544                 }
 545         }
 546         /* Do rest according to version.         */
 547         switch (op->ospf_version) {
 548
 549         case 2:
 550                 /* ospf version 2 */
 551                 if (ospf_decode_v2(op, dataend))
 552                         goto trunc;
 553                 break;
 554
 555         default:
 556                 printf(" ospf [version %d]", op->ospf_version);
 557                 break;
 558         }                       /* end switch on version */
 559
 560         return;
 561 trunc:
 562         fputs(tstr, stdout);
 563 }