contrib/tcpdump/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[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-ospf.c,v 1.66 2007-10-08 07:53:21 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 #include "gmpls.h"
  41
  42 #include "ospf.h"
  43
  44 #include "ip.h"
  45
  46 static struct tok ospf_option_values[] = {
  47         { OSPF_OPTION_T,        "MultiTopology" }, /* draft-ietf-ospf-mt-09 */
  48         { OSPF_OPTION_E,        "External" },
  49         { OSPF_OPTION_MC,       "Multicast" },
  50         { OSPF_OPTION_NP,       "NSSA" },
  51         { OSPF_OPTION_L,        "LLS" },
  52         { OSPF_OPTION_DC,       "Demand Circuit" },
  53         { OSPF_OPTION_O,        "Opaque" },
  54         { OSPF_OPTION_DN,       "Up/Down" },
  55         { 0,                    NULL }
  56 };
  57
  58 static struct tok ospf_authtype_values[] = {
  59         { OSPF_AUTH_NONE,       "none" },
  60         { OSPF_AUTH_SIMPLE,     "simple" },
  61         { OSPF_AUTH_MD5,        "MD5" },
  62         { 0,                    NULL }
  63 };
  64
  65 static struct tok ospf_rla_flag_values[] = {
  66         { RLA_FLAG_B,           "ABR" },
  67         { RLA_FLAG_E,           "ASBR" },
  68         { RLA_FLAG_W1,          "Virtual" },
  69         { RLA_FLAG_W2,          "W2" },
  70         { 0,                    NULL }
  71 };
  72
  73 static struct tok type2str[] = {
  74         { OSPF_TYPE_UMD,        "UMD" },
  75         { OSPF_TYPE_HELLO,      "Hello" },
  76         { OSPF_TYPE_DD,         "Database Description" },
  77         { OSPF_TYPE_LS_REQ,     "LS-Request" },
  78         { OSPF_TYPE_LS_UPDATE,  "LS-Update" },
  79         { OSPF_TYPE_LS_ACK,     "LS-Ack" },
  80         { 0,                    NULL }
  81 };
  82
  83 static struct tok lsa_values[] = {
  84         { LS_TYPE_ROUTER,       "Router" },
  85         { LS_TYPE_NETWORK,      "Network" },
  86         { LS_TYPE_SUM_IP,       "Summary" },
  87         { LS_TYPE_SUM_ABR,      "ASBR Summary" },
  88         { LS_TYPE_ASE,          "External" },
  89         { LS_TYPE_GROUP,        "Multicast Group" },
  90         { LS_TYPE_NSSA,         "NSSA" },
  91         { LS_TYPE_OPAQUE_LL,    "Link Local Opaque" },
  92         { LS_TYPE_OPAQUE_AL,    "Area Local Opaque" },
  93         { LS_TYPE_OPAQUE_DW,    "Domain Wide Opaque" },
  94         { 0,                    NULL }
  95 };
  96
  97 static struct tok ospf_dd_flag_values[] = {
  98         { OSPF_DB_INIT,         "Init" },
  99         { OSPF_DB_MORE,         "More" },
 100         { OSPF_DB_MASTER,       "Master" },
 101     { OSPF_DB_RESYNC,   "OOBResync" },
 102         { 0,                    NULL }
 103 };
 104
 105 static struct tok lsa_opaque_values[] = {
 106         { LS_OPAQUE_TYPE_TE,    "Traffic Engineering" },
 107         { LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
 108         { LS_OPAQUE_TYPE_RI,    "Router Information" },
 109         { 0,                    NULL }
 110 };
 111
 112 static struct tok lsa_opaque_te_tlv_values[] = {
 113         { LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
 114         { LS_OPAQUE_TE_TLV_LINK,   "Link" },
 115         { 0,                    NULL }
 116 };
 117
 118 static struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
 119         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE,            "Link Type" },
 120         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID,              "Link ID" },
 121         { LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP,             "Local Interface IP address" },
 122         { LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP,            "Remote Interface IP address" },
 123         { LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC,            "Traffic Engineering Metric" },
 124         { LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW,               "Maximum Bandwidth" },
 125         { LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW,           "Maximum Reservable Bandwidth" },
 126         { LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW,             "Unreserved Bandwidth" },
 127         { LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP,          "Administrative Group" },
 128         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
 129         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
 130         { LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR,    "Interface Switching Capability" },
 131         { LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP,    "Shared Risk Link Group" },
 132         { LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS,       "Bandwidth Constraints" },
 133         { 0,                    NULL }
 134 };
 135
 136 static struct tok lsa_opaque_grace_tlv_values[] = {
 137         { LS_OPAQUE_GRACE_TLV_PERIOD,             "Grace Period" },
 138         { LS_OPAQUE_GRACE_TLV_REASON,             "Graceful restart Reason" },
 139         { LS_OPAQUE_GRACE_TLV_INT_ADDRESS,        "IPv4 interface address" },
 140         { 0,                    NULL }
 141 };
 142
 143 static struct tok lsa_opaque_grace_tlv_reason_values[] = {
 144         { LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN,     "Unknown" },
 145         { LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART,  "Software Restart" },
 146         { LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE,  "Software Reload/Upgrade" },
 147         { LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH,   "Control Processor Switch" },
 148         { 0,                    NULL }
 149 };
 150
 151 static struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
 152         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
 153         { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA,  "Multi-Access" },
 154         { 0,                    NULL }
 155 };
 156
 157 static struct tok lsa_opaque_ri_tlv_values[] = {
 158         { LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
 159         { 0,                    NULL }
 160 };
 161
 162 static struct tok lsa_opaque_ri_tlv_cap_values[] = {
 163         { 1, "Reserved" },
 164         { 2, "Reserved" },
 165         { 4, "Reserved" },
 166         { 8, "Reserved" },
 167         { 16, "graceful restart capable" },
 168         { 32, "graceful restart helper" },
 169         { 64, "Stub router support" },
 170         { 128, "Traffic engineering" },
 171         { 256, "p2p over LAN" },
 172         { 512, "path computation server" },
 173         { 0,                    NULL }
 174 };
 175
 176 static struct tok ospf_lls_tlv_values[] = {
 177         { OSPF_LLS_EO,  "Extended Options" },
 178         { OSPF_LLS_MD5, "MD5 Authentication" },
 179         { 0,    NULL }
 180 };
 181
 182 static struct tok ospf_lls_eo_options[] = {
 183         { OSPF_LLS_EO_LR,       "LSDB resync" },
 184         { OSPF_LLS_EO_RS,       "Restart" },
 185         { 0,    NULL }
 186 };
 187
 188 static char tstr[] = " [|ospf2]";
 189
 190 #ifdef WIN32
 191 #define inline __inline
 192 #endif /* WIN32 */
 193
 194 static int ospf_print_lshdr(const struct lsa_hdr *);
 195 static const u_char *ospf_print_lsa(const struct lsa *);
 196 static int ospf_decode_v2(const struct ospfhdr *, const u_char *);
 197 static int ospf_decode_lls(const struct ospfhdr *, register u_int);
 198
 199 int
 200 ospf_print_grace_lsa (const u_int8_t *tptr, u_int ls_length) {
 201
 202     u_int tlv_type, tlv_length;
 203
 204
 205     while (ls_length > 0) {
 206         TCHECK2(*tptr, 4);
 207         if (ls_length < 4) {
 208             printf("\n\t    Remaining LS length %u < 4", ls_length);
 209             return -1;
 210         }
 211         tlv_type = EXTRACT_16BITS(tptr);
 212         tlv_length = EXTRACT_16BITS(tptr+2);
 213         tptr+=4;
 214         ls_length-=4;
 215
 216         printf("\n\t    %s TLV (%u), length %u, value: ",
 217                tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
 218                tlv_type,
 219                tlv_length);
 220
 221         if (tlv_length > ls_length) {
 222             printf("\n\t    Bogus length %u > %u", tlv_length,
 223                    ls_length);
 224             return -1;
 225         }
 226
 227         /* Infinite loop protection. */
 228         if (tlv_type == 0 || tlv_length ==0) {
 229             return -1;
 230         }
 231
 232         TCHECK2(*tptr, tlv_length);
 233         switch(tlv_type) {
 234
 235         case LS_OPAQUE_GRACE_TLV_PERIOD:
 236             if (tlv_length != 4) {
 237                 printf("\n\t    Bogus length %u != 4", tlv_length);
 238                 return -1;
 239             }
 240             printf("%us",EXTRACT_32BITS(tptr));
 241             break;
 242
 243         case LS_OPAQUE_GRACE_TLV_REASON:
 244             if (tlv_length != 1) {
 245                 printf("\n\t    Bogus length %u != 1", tlv_length);
 246                 return -1;
 247             }
 248             printf("%s (%u)",
 249                    tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", *tptr),
 250                    *tptr);
 251             break;
 252
 253         case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
 254             if (tlv_length != 4) {
 255                 printf("\n\t    Bogus length %u != 4", tlv_length);
 256                 return -1;
 257             }
 258             printf("%s", ipaddr_string(tptr));
 259             break;
 260
 261         default:
 262             if (vflag <= 1) {
 263                 if(!print_unknown_data(tptr,"\n\t      ",tlv_length))
 264                     return -1;
 265             }
 266             break;
 267
 268         }
 269         /* in OSPF everything has to be 32-bit aligned, including TLVs */
 270         if (tlv_length%4 != 0)
 271             tlv_length+=4-(tlv_length%4);
 272         ls_length-=tlv_length;
 273         tptr+=tlv_length;
 274     }
 275
 276     return 0;
 277 trunc:
 278     return -1;
 279 }
 280
 281 int
 282 ospf_print_te_lsa (const u_int8_t *tptr, u_int ls_length) {
 283
 284     u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
 285     u_int priority_level, te_class, count_srlg;
 286     union { /* int to float conversion buffer for several subTLVs */
 287         float f;
 288         u_int32_t i;
 289     } bw;
 290
 291     while (ls_length != 0) {
 292         TCHECK2(*tptr, 4);
 293         if (ls_length < 4) {
 294             printf("\n\t    Remaining LS length %u < 4", ls_length);
 295             return -1;
 296         }
 297         tlv_type = EXTRACT_16BITS(tptr);
 298         tlv_length = EXTRACT_16BITS(tptr+2);
 299         tptr+=4;
 300         ls_length-=4;
 301
 302         printf("\n\t    %s TLV (%u), length: %u",
 303                tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
 304                tlv_type,
 305                tlv_length);
 306
 307         if (tlv_length > ls_length) {
 308             printf("\n\t    Bogus length %u > %u", tlv_length,
 309                    ls_length);
 310             return -1;
 311         }
 312
 313         /* Infinite loop protection. */
 314         if (tlv_type == 0 || tlv_length ==0) {
 315             return -1;
 316         }
 317
 318         switch(tlv_type) {
 319         case LS_OPAQUE_TE_TLV_LINK:
 320             while (tlv_length >= sizeof(subtlv_type) + sizeof(subtlv_length)) {
 321                 if (tlv_length < 4) {
 322                     printf("\n\t    Remaining TLV length %u < 4",
 323                            tlv_length);
 324                     return -1;
 325                 }
 326                 TCHECK2(*tptr, 4);
 327                 subtlv_type = EXTRACT_16BITS(tptr);
 328                 subtlv_length = EXTRACT_16BITS(tptr+2);
 329                 tptr+=4;
 330                 tlv_length-=4;
 331
 332                 printf("\n\t      %s subTLV (%u), length: %u",
 333                        tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
 334                        subtlv_type,
 335                        subtlv_length);
 336
 337                 TCHECK2(*tptr, subtlv_length);
 338                 switch(subtlv_type) {
 339                 case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
 340                     printf(", 0x%08x", EXTRACT_32BITS(tptr));
 341                     break;
 342                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
 343                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
 344                     printf(", %s (0x%08x)",
 345                            ipaddr_string(tptr),
 346                            EXTRACT_32BITS(tptr));
 347                     if (subtlv_length == 8) /* rfc4203 */
 348                         printf(", %s (0x%08x)",
 349                                ipaddr_string(tptr+4),
 350                                EXTRACT_32BITS(tptr+4));
 351                     break;
 352                 case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
 353                 case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
 354                     printf(", %s", ipaddr_string(tptr));
 355                     break;
 356                 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
 357                 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
 358                     bw.i = EXTRACT_32BITS(tptr);
 359                     printf(", %.3f Mbps", bw.f*8/1000000 );
 360                     break;
 361                 case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
 362                     for (te_class = 0; te_class < 8; te_class++) {
 363                         bw.i = EXTRACT_32BITS(tptr+te_class*4);
 364                         printf("\n\t\tTE-Class %u: %.3f Mbps",
 365                                te_class,
 366                                bw.f*8/1000000 );
 367                     }
 368                     break;
 369                 case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
 370                     printf("\n\t\tBandwidth Constraints Model ID: %s (%u)",
 371                            tok2str(diffserv_te_bc_values, "unknown", *tptr),
 372                            *tptr);
 373                     /* decode BCs until the subTLV ends */
 374                     for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
 375                         bw.i = EXTRACT_32BITS(tptr+4+te_class*4);
 376                         printf("\n\t\t  Bandwidth constraint CT%u: %.3f Mbps",
 377                                te_class,
 378                                bw.f*8/1000000 );
 379                     }
 380                     break;
 381                 case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
 382                     printf(", Metric %u", EXTRACT_32BITS(tptr));
 383                     break;
 384                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
 385                     printf(", %s, Priority %u",
 386                            bittok2str(gmpls_link_prot_values, "none", *tptr),
 387                            *(tptr+1));
 388                     break;
 389                 case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
 390                     printf("\n\t\tInterface Switching Capability: %s",
 391                            tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
 392                     printf("\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
 393                            tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
 394                     for (priority_level = 0; priority_level < 8; priority_level++) {
 395                         bw.i = EXTRACT_32BITS(tptr+4+(priority_level*4));
 396                         printf("\n\t\t  priority level %d: %.3f Mbps",
 397                                priority_level,
 398                                bw.f*8/1000000 );
 399                     }
 400                     break;
 401                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
 402                     printf(", %s (%u)",
 403                            tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",*tptr),
 404                            *tptr);
 405                     break;
 406
 407                 case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
 408                     count_srlg = subtlv_length / 4;
 409                     if (count_srlg != 0)
 410                         printf("\n\t\t  Shared risk group: ");
 411                     while (count_srlg > 0) {
 412                         bw.i = EXTRACT_32BITS(tptr);
 413                         printf("%d",bw.i);
 414                         tptr+=4;
 415                         count_srlg--;
 416                         if (count_srlg > 0)
 417                             printf(", ");
 418                     }
 419                     break;
 420
 421                 default:
 422                     if (vflag <= 1) {
 423                         if(!print_unknown_data(tptr,"\n\t\t",subtlv_length))
 424                             return -1;
 425                     }
 426                     break;
 427                 }
 428                 /* in OSPF everything has to be 32-bit aligned, including subTLVs */
 429                 if (subtlv_length%4 != 0)
 430                     subtlv_length+=4-(subtlv_length%4);
 431
 432                 tlv_length-=subtlv_length;
 433                 tptr+=subtlv_length;
 434
 435             }
 436             break;
 437
 438         case LS_OPAQUE_TE_TLV_ROUTER:
 439             if (tlv_length < 4) {
 440                 printf("\n\t    TLV length %u < 4", tlv_length);
 441                 return -1;
 442             }
 443             TCHECK2(*tptr, 4);
 444             printf(", %s", ipaddr_string(tptr));
 445             break;
 446
 447         default:
 448             if (vflag <= 1) {
 449                 if(!print_unknown_data(tptr,"\n\t      ",tlv_length))
 450                     return -1;
 451             }
 452             break;
 453         }
 454         /* in OSPF everything has to be 32-bit aligned, including TLVs */
 455         if (tlv_length%4 != 0)
 456             tlv_length+=4-(tlv_length%4);
 457         ls_length-=tlv_length;
 458         tptr+=tlv_length;
 459     }
 460     return 0;
 461 trunc:
 462     return -1;
 463 }
 464
 465
 466 static int
 467 ospf_print_lshdr(register const struct lsa_hdr *lshp)
 468 {
 469         u_int ls_length;
 470
 471         TCHECK(lshp->ls_length);
 472         ls_length = EXTRACT_16BITS(&lshp->ls_length);
 473         if (ls_length < sizeof(struct lsa_hdr)) {
 474                 printf("\n\t    Bogus length %u < header (%lu)", ls_length,
 475                     (unsigned long)sizeof(struct lsa_hdr));
 476                 return(-1);
 477         }
 478
 479         TCHECK(lshp->ls_seq);   /* XXX - ls_length check checked this */
 480         printf("\n\t  Advertising Router %s, seq 0x%08x, age %us, length %u",
 481                ipaddr_string(&lshp->ls_router),
 482                EXTRACT_32BITS(&lshp->ls_seq),
 483                EXTRACT_16BITS(&lshp->ls_age),
 484                ls_length-(u_int)sizeof(struct lsa_hdr));
 485
 486         TCHECK(lshp->ls_type);  /* XXX - ls_length check checked this */
 487         switch (lshp->ls_type) {
 488         /* the LSA header for opaque LSAs was slightly changed */
 489         case LS_TYPE_OPAQUE_LL:
 490         case LS_TYPE_OPAQUE_AL:
 491         case LS_TYPE_OPAQUE_DW:
 492             printf("\n\t    %s LSA (%d), Opaque-Type %s LSA (%u), Opaque-ID %u",
 493                    tok2str(lsa_values,"unknown",lshp->ls_type),
 494                    lshp->ls_type,
 495
 496                    tok2str(lsa_opaque_values,
 497                            "unknown",
 498                            *(&lshp->un_lsa_id.opaque_field.opaque_type)),
 499                    *(&lshp->un_lsa_id.opaque_field.opaque_type),
 500                    EXTRACT_24BITS(&lshp->un_lsa_id.opaque_field.opaque_id)
 501
 502                    );
 503             break;
 504
 505         /* all other LSA types use regular style LSA headers */
 506         default:
 507             printf("\n\t    %s LSA (%d), LSA-ID: %s",
 508                    tok2str(lsa_values,"unknown",lshp->ls_type),
 509                    lshp->ls_type,
 510                    ipaddr_string(&lshp->un_lsa_id.lsa_id));
 511             break;
 512         }
 513
 514         TCHECK(lshp->ls_options);       /* XXX - ls_length check checked this */
 515         printf("\n\t    Options: [%s]", bittok2str(ospf_option_values,"none",lshp->ls_options));
 516
 517         return (ls_length);
 518 trunc:
 519         return (-1);
 520 }
 521
 522 /* draft-ietf-ospf-mt-09 */
 523 static struct tok ospf_topology_values[] = {
 524     { 0, "default " },
 525     { 1, "multicast " },
 526     { 2, "management " },
 527     { 0, NULL }
 528 };
 529
 530 /*
 531  * Print all the per-topology metrics.
 532  */
 533 static void
 534 ospf_print_tos_metrics(const union un_tos *tos)
 535 {
 536     int metric_count;
 537     int toscount;
 538
 539     toscount = tos->link.link_tos_count+1;
 540     metric_count = 0;
 541
 542     /*
 543      * All but the first metric contain a valid topology id.
 544      */
 545     while (toscount) {
 546         printf("\n\t\ttopology %s(%u), metric %u",
 547                tok2str(ospf_topology_values, "",
 548                        metric_count ? tos->metrics.tos_type : 0),
 549                metric_count ? tos->metrics.tos_type : 0,
 550                EXTRACT_16BITS(&tos->metrics.tos_metric));
 551         metric_count++;
 552         tos++;
 553         toscount--;
 554     }
 555 }
 556
 557 /*
 558  * Print a single link state advertisement.  If truncated or if LSA length
 559  * field is less than the length of the LSA header, return NULl, else
 560  * return pointer to data past end of LSA.
 561  */
 562 static const u_int8_t *
 563 ospf_print_lsa(register const struct lsa *lsap)
 564 {
 565         register const u_int8_t *ls_end;
 566         register const struct rlalink *rlp;
 567         register const struct in_addr *ap;
 568         register const struct aslametric *almp;
 569         register const struct mcla *mcp;
 570         register const u_int32_t *lp;
 571         register int j, tlv_type, tlv_length, topology;
 572         register int ls_length;
 573         const u_int8_t *tptr;
 574
 575         tptr = (u_int8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
 576         ls_length = ospf_print_lshdr(&lsap->ls_hdr);
 577         if (ls_length == -1)
 578                 return(NULL);
 579         ls_end = (u_int8_t *)lsap + ls_length;
 580         ls_length -= sizeof(struct lsa_hdr);
 581
 582         switch (lsap->ls_hdr.ls_type) {
 583
 584         case LS_TYPE_ROUTER:
 585                 TCHECK(lsap->lsa_un.un_rla.rla_flags);
 586                 printf("\n\t    Router LSA Options: [%s]", bittok2str(ospf_rla_flag_values,"none",lsap->lsa_un.un_rla.rla_flags));
 587
 588                 TCHECK(lsap->lsa_un.un_rla.rla_count);
 589                 j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
 590                 TCHECK(lsap->lsa_un.un_rla.rla_link);
 591                 rlp = lsap->lsa_un.un_rla.rla_link;
 592                 while (j--) {
 593                         TCHECK(*rlp);
 594                         switch (rlp->un_tos.link.link_type) {
 595
 596                         case RLA_TYPE_VIRTUAL:
 597                                 printf("\n\t      Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
 598                                     ipaddr_string(&rlp->link_id),
 599                                     ipaddr_string(&rlp->link_data));
 600                                 break;
 601
 602                         case RLA_TYPE_ROUTER:
 603                                 printf("\n\t      Neighbor Router-ID: %s, Interface Address: %s",
 604                                     ipaddr_string(&rlp->link_id),
 605                                     ipaddr_string(&rlp->link_data));
 606                                 break;
 607
 608                         case RLA_TYPE_TRANSIT:
 609                                 printf("\n\t      Neighbor Network-ID: %s, Interface Address: %s",
 610                                     ipaddr_string(&rlp->link_id),
 611                                     ipaddr_string(&rlp->link_data));
 612                                 break;
 613
 614                         case RLA_TYPE_STUB:
 615                                 printf("\n\t      Stub Network: %s, Mask: %s",
 616                                     ipaddr_string(&rlp->link_id),
 617                                     ipaddr_string(&rlp->link_data));
 618                                 break;
 619
 620                         default:
 621                                 printf("\n\t      Unknown Router Link Type (%u)",
 622                                     rlp->un_tos.link.link_type);
 623                                 return (ls_end);
 624                         }
 625
 626                         ospf_print_tos_metrics(&rlp->un_tos);
 627
 628                         rlp = (struct rlalink *)((u_char *)(rlp + 1) +
 629                             ((rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
 630                 }
 631                 break;
 632
 633         case LS_TYPE_NETWORK:
 634                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 635                 printf("\n\t    Mask %s\n\t    Connected Routers:",
 636                     ipaddr_string(&lsap->lsa_un.un_nla.nla_mask));
 637                 ap = lsap->lsa_un.un_nla.nla_router;
 638                 while ((u_char *)ap < ls_end) {
 639                         TCHECK(*ap);
 640                         printf("\n\t      %s", ipaddr_string(ap));
 641                         ++ap;
 642                 }
 643                 break;
 644
 645         case LS_TYPE_SUM_IP:
 646                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 647                 printf("\n\t    Mask %s",
 648                     ipaddr_string(&lsap->lsa_un.un_sla.sla_mask));
 649                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 650                 lp = lsap->lsa_un.un_sla.sla_tosmetric;
 651                 while ((u_char *)lp < ls_end) {
 652                         register u_int32_t ul;
 653
 654                         TCHECK(*lp);
 655                         ul = EXTRACT_32BITS(lp);
 656                         topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
 657                         printf("\n\t\ttopology %s(%u) metric %d",
 658                                tok2str(ospf_topology_values, "", topology),
 659                                topology,
 660                                ul & SLA_MASK_METRIC);
 661                         ++lp;
 662                 }
 663                 break;
 664
 665         case LS_TYPE_SUM_ABR:
 666                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 667                 lp = lsap->lsa_un.un_sla.sla_tosmetric;
 668                 while ((u_char *)lp < ls_end) {
 669                         register u_int32_t ul;
 670
 671                         TCHECK(*lp);
 672                         ul = EXTRACT_32BITS(lp);
 673                         topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
 674                         printf("\n\t\ttopology %s(%u) metric %d",
 675                                tok2str(ospf_topology_values, "", topology),
 676                                topology,
 677                                ul & SLA_MASK_METRIC);
 678                         ++lp;
 679                 }
 680                 break;
 681
 682         case LS_TYPE_ASE:
 683         case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
 684                 TCHECK(lsap->lsa_un.un_nla.nla_mask);
 685                 printf("\n\t    Mask %s",
 686                     ipaddr_string(&lsap->lsa_un.un_asla.asla_mask));
 687
 688                 TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
 689                 almp = lsap->lsa_un.un_asla.asla_metric;
 690                 while ((u_char *)almp < ls_end) {
 691                         register u_int32_t ul;
 692
 693                         TCHECK(almp->asla_tosmetric);
 694                         ul = EXTRACT_32BITS(&almp->asla_tosmetric);
 695                         topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
 696                         printf("\n\t\ttopology %s(%u), type %d, metric",
 697                                tok2str(ospf_topology_values, "", topology),
 698                                topology,
 699                                (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1);
 700                         if ((ul & ASLA_MASK_METRIC)==0xffffff)
 701                             printf(" infinite");
 702                         else
 703                             printf(" %d", (ul & ASLA_MASK_METRIC));
 704
 705                         TCHECK(almp->asla_forward);
 706                         if (almp->asla_forward.s_addr) {
 707                                 printf(", forward %s",
 708                                     ipaddr_string(&almp->asla_forward));
 709                         }
 710                         TCHECK(almp->asla_tag);
 711                         if (almp->asla_tag.s_addr) {
 712                                 printf(", tag %s",
 713                                     ipaddr_string(&almp->asla_tag));
 714                         }
 715                         ++almp;
 716                 }
 717                 break;
 718
 719         case LS_TYPE_GROUP:
 720                 /* Multicast extensions as of 23 July 1991 */
 721                 mcp = lsap->lsa_un.un_mcla;
 722                 while ((u_char *)mcp < ls_end) {
 723                         TCHECK(mcp->mcla_vid);
 724                         switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {
 725
 726                         case MCLA_VERTEX_ROUTER:
 727                                 printf("\n\t    Router Router-ID %s",
 728                                     ipaddr_string(&mcp->mcla_vid));
 729                                 break;
 730
 731                         case MCLA_VERTEX_NETWORK:
 732                                 printf("\n\t    Network Designated Router %s",
 733                                     ipaddr_string(&mcp->mcla_vid));
 734                                 break;
 735
 736                         default:
 737                                 printf("\n\t    unknown VertexType (%u)",
 738                                     EXTRACT_32BITS(&mcp->mcla_vtype));
 739                                 break;
 740                         }
 741                 ++mcp;
 742                 }
 743                 break;
 744
 745         case LS_TYPE_OPAQUE_LL: /* fall through */
 746         case LS_TYPE_OPAQUE_AL:
 747         case LS_TYPE_OPAQUE_DW:
 748
 749             switch (*(&lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
 750             case LS_OPAQUE_TYPE_RI:
 751                 tptr = (u_int8_t *)(&lsap->lsa_un.un_ri_tlv.type);
 752
 753                 while (ls_length != 0) {
 754                     TCHECK2(*tptr, 4);
 755                     if (ls_length < 4) {
 756                         printf("\n\t    Remaining LS length %u < 4", ls_length);
 757                         return(ls_end);
 758                     }
 759                     tlv_type = EXTRACT_16BITS(tptr);
 760                     tlv_length = EXTRACT_16BITS(tptr+2);
 761                     tptr+=4;
 762                     ls_length-=4;
 763
 764                     printf("\n\t    %s TLV (%u), length: %u, value: ",
 765                            tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
 766                            tlv_type,
 767                            tlv_length);
 768
 769                     if (tlv_length > ls_length) {
 770                         printf("\n\t    Bogus length %u > %u", tlv_length,
 771                             ls_length);
 772                         return(ls_end);
 773                     }
 774                     TCHECK2(*tptr, tlv_length);
 775                     switch(tlv_type) {
 776
 777                     case LS_OPAQUE_RI_TLV_CAP:
 778                         if (tlv_length != 4) {
 779                             printf("\n\t    Bogus length %u != 4", tlv_length);
 780                             return(ls_end);
 781                         }
 782                         printf("Capabilities: %s",
 783                                bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", EXTRACT_32BITS(tptr)));
 784                         break;
 785                     default:
 786                         if (vflag <= 1) {
 787                             if(!print_unknown_data(tptr,"\n\t      ",tlv_length))
 788                                 return(ls_end);
 789                         }
 790                         break;
 791
 792                     }
 793                     tptr+=tlv_length;
 794                     ls_length-=tlv_length;
 795                 }
 796                 break;
 797
 798             case LS_OPAQUE_TYPE_GRACE:
 799                 if (ospf_print_grace_lsa((u_int8_t *)(&lsap->lsa_un.un_grace_tlv.type),
 800                                          ls_length) == -1) {
 801                     return(ls_end);
 802                 }
 803                 break;
 804
 805             case LS_OPAQUE_TYPE_TE:
 806                 if (ospf_print_te_lsa((u_int8_t *)(&lsap->lsa_un.un_te_lsa_tlv.type),
 807                                       ls_length) == -1) {
 808                     return(ls_end);
 809                 }
 810                 break;
 811
 812             default:
 813                 if (vflag <= 1) {
 814                     if(!print_unknown_data((u_int8_t *)lsap->lsa_un.un_unknown,
 815                                            "\n\t    ", ls_length))
 816                         return(ls_end);
 817                 }
 818                 break;
 819             }
 820         }
 821
 822         /* do we want to see an additionally hexdump ? */
 823         if (vflag> 1)
 824             if(!print_unknown_data((u_int8_t *)lsap->lsa_un.un_unknown,
 825                                    "\n\t    ", ls_length)) {
 826                 return(ls_end);
 827             }
 828
 829         return (ls_end);
 830 trunc:
 831         return (NULL);
 832 }
 833
 834 static int
 835 ospf_decode_lls(register const struct ospfhdr *op,
 836                 register u_int length)
 837 {
 838     register const u_char *dptr;
 839     register const u_char *dataend;
 840     register u_int length2;
 841     register u_int16_t lls_type, lls_len;
 842     register u_int32_t lls_flags;
 843
 844     switch (op->ospf_type) {
 845
 846     case OSPF_TYPE_HELLO:
 847         if (!(op->ospf_hello.hello_options & OSPF_OPTION_L))
 848             return (0);
 849         break;
 850
 851     case OSPF_TYPE_DD:
 852         if (!(op->ospf_db.db_options & OSPF_OPTION_L))
 853             return (0);
 854         break;
 855
 856     default:
 857         return (0);
 858     }
 859
 860     /* dig deeper if LLS data is available; see RFC4813 */
 861     length2 = EXTRACT_16BITS(&op->ospf_len);
 862     dptr = (u_char *)op + length2;
 863     dataend = (u_char *)op + length;
 864
 865     if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
 866         dptr = dptr + op->ospf_authdata[3];
 867         length2 += op->ospf_authdata[3];
 868     }
 869     if (length2 >= length) {
 870         printf("\n\t[LLS truncated]");
 871         return (1);
 872     }
 873     TCHECK2(*dptr, 2);
 874     printf("\n\t  LLS: checksum: 0x%04x", (u_int)EXTRACT_16BITS(dptr));
 875
 876     dptr += 2;
 877     TCHECK2(*dptr, 2);
 878     length2 = EXTRACT_16BITS(dptr);
 879     printf(", length: %u", length2);
 880
 881     dptr += 2;
 882     TCHECK(*dptr);
 883     while (dptr < dataend) {
 884         TCHECK2(*dptr, 2);
 885         lls_type = EXTRACT_16BITS(dptr);
 886         printf("\n\t    %s (%u)",
 887                tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
 888                lls_type);
 889         dptr += 2;
 890         TCHECK2(*dptr, 2);
 891         lls_len = EXTRACT_16BITS(dptr);
 892         printf(", length: %u", lls_len);
 893         dptr += 2;
 894         switch (lls_type) {
 895
 896         case OSPF_LLS_EO:
 897             if (lls_len != 4) {
 898                 printf(" [should be 4]");
 899                 lls_len = 4;
 900             }
 901             TCHECK2(*dptr, 4);
 902             lls_flags = EXTRACT_32BITS(dptr);
 903             printf("\n\t      Options: 0x%08x [%s]", lls_flags,
 904                    bittok2str(ospf_lls_eo_options,"?",lls_flags));
 905
 906             break;
 907
 908         case OSPF_LLS_MD5:
 909             if (lls_len != 20) {
 910                 printf(" [should be 20]");
 911                 lls_len = 20;
 912             }
 913                         TCHECK2(*dptr, 4);
 914             printf("\n\t      Sequence number: 0x%08x", EXTRACT_32BITS(dptr));
 915             break;
 916         }
 917
 918         dptr += lls_len;
 919     }
 920
 921     return (0);
 922 trunc:
 923     return (1);
 924 }
 925
 926 static int
 927 ospf_decode_v2(register const struct ospfhdr *op,
 928     register const u_char *dataend)
 929 {
 930         register const struct in_addr *ap;
 931         register const struct lsr *lsrp;
 932         register const struct lsa_hdr *lshp;
 933         register const struct lsa *lsap;
 934         register u_int32_t lsa_count,lsa_count_max;
 935
 936         switch (op->ospf_type) {
 937
 938         case OSPF_TYPE_UMD:
 939                 /*
 940                  * Rob Coltun's special monitoring packets;
 941                  * do nothing
 942                  */
 943                 break;
 944
 945         case OSPF_TYPE_HELLO:
 946                 printf("\n\tOptions [%s]",
 947                        bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options));
 948
 949                 TCHECK(op->ospf_hello.hello_deadint);
 950                 printf("\n\t  Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
 951                        EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
 952                        EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
 953                        ipaddr_string(&op->ospf_hello.hello_mask),
 954                        op->ospf_hello.hello_priority);
 955
 956                 TCHECK(op->ospf_hello.hello_dr);
 957                 if (op->ospf_hello.hello_dr.s_addr != 0)
 958                         printf("\n\t  Designated Router %s",
 959                             ipaddr_string(&op->ospf_hello.hello_dr));
 960
 961                 TCHECK(op->ospf_hello.hello_bdr);
 962                 if (op->ospf_hello.hello_bdr.s_addr != 0)
 963                         printf(", Backup Designated Router %s",
 964                             ipaddr_string(&op->ospf_hello.hello_bdr));
 965
 966                 ap = op->ospf_hello.hello_neighbor;
 967                 if ((u_char *)ap < dataend)
 968                         printf("\n\t  Neighbor List:");
 969                 while ((u_char *)ap < dataend) {
 970                         TCHECK(*ap);
 971                         printf("\n\t    %s", ipaddr_string(ap));
 972                         ++ap;
 973                 }
 974                 break;  /* HELLO */
 975
 976         case OSPF_TYPE_DD:
 977                 TCHECK(op->ospf_db.db_options);
 978                 printf("\n\tOptions [%s]",
 979                        bittok2str(ospf_option_values,"none",op->ospf_db.db_options));
 980                 TCHECK(op->ospf_db.db_flags);
 981                 printf(", DD Flags [%s]",
 982                        bittok2str(ospf_dd_flag_values,"none",op->ospf_db.db_flags));
 983                 TCHECK(op->ospf_db.db_ifmtu);
 984                 if (op->ospf_db.db_ifmtu) {
 985                         printf(", MTU: %u", EXTRACT_16BITS(&op->ospf_db.db_ifmtu));
 986                 }
 987                 TCHECK(op->ospf_db.db_seq);
 988                 printf(", Sequence: 0x%08x", EXTRACT_32BITS(&op->ospf_db.db_seq));
 989
 990                 /* Print all the LS adv's */
 991                 lshp = op->ospf_db.db_lshdr;
 992                 while (((u_char *)lshp < dataend) && ospf_print_lshdr(lshp) != -1) {
 993                     ++lshp;
 994                 }
 995                 break;
 996
 997         case OSPF_TYPE_LS_REQ:
 998                 lsrp = op->ospf_lsr;
 999                 while ((u_char *)lsrp < dataend) {
1000                     TCHECK(*lsrp);
1001
1002                     printf("\n\t  Advertising Router: %s, %s LSA (%u)",
1003                            ipaddr_string(&lsrp->ls_router),
1004                            tok2str(lsa_values,"unknown",EXTRACT_32BITS(lsrp->ls_type)),
1005                            EXTRACT_32BITS(&lsrp->ls_type));
1006
1007                     switch (EXTRACT_32BITS(lsrp->ls_type)) {
1008                         /* the LSA header for opaque LSAs was slightly changed */
1009                     case LS_TYPE_OPAQUE_LL:
1010                     case LS_TYPE_OPAQUE_AL:
1011                     case LS_TYPE_OPAQUE_DW:
1012                         printf(", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
1013                                tok2str(lsa_opaque_values, "unknown",lsrp->un_ls_stateid.opaque_field.opaque_type),
1014                                lsrp->un_ls_stateid.opaque_field.opaque_type,
1015                                EXTRACT_24BITS(&lsrp->un_ls_stateid.opaque_field.opaque_id));
1016                         break;
1017                     default:
1018                         printf(", LSA-ID: %s",
1019                                ipaddr_string(&lsrp->un_ls_stateid.ls_stateid));
1020                         break;
1021                     }
1022
1023                     ++lsrp;
1024                 }
1025                 break;
1026
1027         case OSPF_TYPE_LS_UPDATE:
1028                 lsap = op->ospf_lsu.lsu_lsa;
1029                 TCHECK(op->ospf_lsu.lsu_count);
1030                 lsa_count_max = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
1031                 printf(", %d LSA%s",lsa_count_max, PLURAL_SUFFIX(lsa_count_max));
1032                 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1033                     printf("\n\t  LSA #%u",lsa_count);
1034                         lsap = (const struct lsa *)ospf_print_lsa(lsap);
1035                         if (lsap == NULL)
1036                                 goto trunc;
1037                 }
1038                 break;
1039
1040         case OSPF_TYPE_LS_ACK:
1041                 lshp = op->ospf_lsa.lsa_lshdr;
1042                 while (ospf_print_lshdr(lshp) != -1) {
1043                     ++lshp;
1044                 }
1045                 break;
1046
1047         default:
1048                 break;
1049         }
1050         return (0);
1051 trunc:
1052         return (1);
1053 }
1054
1055 void
1056 ospf_print(register const u_char *bp, register u_int length,
1057     const u_char *bp2 _U_)
1058 {
1059         register const struct ospfhdr *op;
1060         register const u_char *dataend;
1061         register const char *cp;
1062
1063         op = (struct ospfhdr *)bp;
1064
1065         /* XXX Before we do anything else, strip off the MD5 trailer */
1066         TCHECK(op->ospf_authtype);
1067         if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
1068                 length -= OSPF_AUTH_MD5_LEN;
1069                 snapend -= OSPF_AUTH_MD5_LEN;
1070         }
1071
1072         /* If the type is valid translate it, or just print the type */
1073         /* value.  If it's not valid, say so and return */
1074         TCHECK(op->ospf_type);
1075         cp = tok2str(type2str, "unknown LS-type", op->ospf_type);
1076         printf("OSPFv%u, %s, length %u",
1077                op->ospf_version,
1078                cp,
1079                length);
1080         if (*cp == 'u')
1081                 return;
1082
1083         if(!vflag) { /* non verbose - so lets bail out here */
1084                 return;
1085         }
1086
1087         TCHECK(op->ospf_len);
1088         if (length != EXTRACT_16BITS(&op->ospf_len)) {
1089                 printf(" [len %d]", EXTRACT_16BITS(&op->ospf_len));
1090         }
1091
1092         if (length > EXTRACT_16BITS(&op->ospf_len)) {
1093                 dataend = bp + EXTRACT_16BITS(&op->ospf_len);
1094         } else {
1095                 dataend = bp + length;
1096         }
1097
1098         TCHECK(op->ospf_routerid);
1099         printf("\n\tRouter-ID %s", ipaddr_string(&op->ospf_routerid));
1100
1101         TCHECK(op->ospf_areaid);
1102         if (op->ospf_areaid.s_addr != 0)
1103                 printf(", Area %s", ipaddr_string(&op->ospf_areaid));
1104         else
1105                 printf(", Backbone Area");
1106
1107         if (vflag) {
1108                 /* Print authentication data (should we really do this?) */
1109                 TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
1110
1111                 printf(", Authentication Type: %s (%u)",
1112                        tok2str(ospf_authtype_values,"unknown",EXTRACT_16BITS(&op->ospf_authtype)),
1113                        EXTRACT_16BITS(&op->ospf_authtype));
1114
1115                 switch (EXTRACT_16BITS(&op->ospf_authtype)) {
1116
1117                 case OSPF_AUTH_NONE:
1118                         break;
1119
1120                 case OSPF_AUTH_SIMPLE:
1121                         printf("\n\tSimple text password: ");
1122                         safeputs((const char *)op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN);
1123                         break;
1124
1125                 case OSPF_AUTH_MD5:
1126                         printf("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1127                                *((op->ospf_authdata)+2),
1128                                *((op->ospf_authdata)+3),
1129                                EXTRACT_32BITS((op->ospf_authdata)+4));
1130                         break;
1131
1132                 default:
1133                         return;
1134                 }
1135         }
1136         /* Do rest according to version.         */
1137         switch (op->ospf_version) {
1138
1139         case 2:
1140                 /* ospf version 2 */
1141                 if (ospf_decode_v2(op, dataend))
1142                         goto trunc;
1143                 if (length > EXTRACT_16BITS(&op->ospf_len)) {
1144                         if (ospf_decode_lls(op, length))
1145                                 goto trunc;
1146                 }
1147                 break;
1148
1149         default:
1150                 printf(" ospf [version %d]", op->ospf_version);
1151                 break;
1152         }                       /* end switch on version */
1153
1154         return;
1155 trunc:
1156         fputs(tstr, stdout);
1157 }