packet-ospf.c

   1 /* packet-ospf.c
   2  * Routines for OSPF packet disassembly
   3  * (c) Copyright Hannes R. Boehm <hannes@boehm.org>
   4  *
   5  * $Id: packet-ospf.c,v 1.53 2001/12/10 00:25:31 guy Exp $
   6  *
   7  * At this time, this module is able to analyze OSPF
   8  * packets as specified in RFC2328. MOSPF (RFC1584) and other
   9  * OSPF Extensions which introduce new Packet types
  10  * (e.g the External Atributes LSA) are not supported.
  11  * Furthermore RFC2740 (OSPFv3 - OSPF for IPv6) is now supported
  12  *   - (c) 2001 Palle Lyckegaard <palle[AT]lyckegaard.dk>
  13  *
  14  * TOS - support is not fully implemented
  15  *
  16  * Ethereal - Network traffic analyzer
  17  * By Gerald Combs <gerald@ethereal.com>
  18  * Copyright 1998 Gerald Combs
  19  *
  20  * This program is free software; you can redistribute it and/or
  21  * modify it under the terms of the GNU General Public License
  22  * as published by the Free Software Foundation; either version 2
  23  * of the License, or (at your option) any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program; if not, write to the Free Software
  32  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  33  */
  34
  35 #ifdef HAVE_CONFIG_H
  36 # include "config.h"
  37 #endif
  38
  39 #ifdef HAVE_SYS_TYPES_H
  40 # include <sys/types.h>
  41 #endif
  42
  43 #ifdef HAVE_NETINET_IN_H
  44 # include <netinet/in.h>
  45 #endif
  46
  47 #include <stdio.h>
  48 #include <string.h>
  49
  50 #include <glib.h>
  51 #include "packet.h"
  52 #include "ipproto.h"
  53 #include "in_cksum.h"
  54 #include "ieee-float.h"
  55
  56 #define OSPF_VERSION_2 2
  57 #define OSPF_VERSION_3 3
  58 #define OSPF_VERSION_2_HEADER_LENGTH    24
  59 #define OSPF_VERSION_3_HEADER_LENGTH    16
  60
  61
  62 #define OSPF_HELLO      1
  63 #define OSPF_DB_DESC    2
  64 #define OSPF_LS_REQ     3
  65 #define OSPF_LS_UPD     4
  66 #define OSPF_LS_ACK     5
  67
  68 static const value_string pt_vals[] = {
  69         {OSPF_HELLO,   "Hello Packet"   },
  70         {OSPF_DB_DESC, "DB Descr."      },
  71         {OSPF_LS_REQ,  "LS Request"     },
  72         {OSPF_LS_UPD,  "LS Update"      },
  73         {OSPF_LS_ACK,  "LS Acknowledge" },
  74         {0,             NULL            }
  75 };
  76
  77 #define OSPF_AUTH_NONE          0
  78 #define OSPF_AUTH_SIMPLE        1
  79 #define OSPF_AUTH_CRYPT         2
  80
  81 static const value_string auth_vals[] = {
  82         {OSPF_AUTH_NONE,   "Null"            },
  83         {OSPF_AUTH_SIMPLE, "Simple password" },
  84         {OSPF_AUTH_CRYPT,  "Cryptographic"   },
  85         {0,                NULL              }
  86 };
  87
  88 #define OSPF_V2_OPTIONS_E               0x02
  89 #define OSPF_V2_OPTIONS_MC              0x04
  90 #define OSPF_V2_OPTIONS_NP              0x08
  91 #define OSPF_V2_OPTIONS_EA              0x10
  92 #define OSPF_V2_OPTIONS_DC              0x20
  93 #define OSPF_V2_OPTIONS_O               0x40
  94 #define OSPF_V2_OPTIONS_DN              0x01
  95 #define OSPF_V3_OPTIONS_V6              0x01
  96 #define OSPF_V3_OPTIONS_E               0x02
  97 #define OSPF_V3_OPTIONS_MC              0x04
  98 #define OSPF_V3_OPTIONS_N               0x08
  99 #define OSPF_V3_OPTIONS_R               0x10
 100 #define OSPF_V3_OPTIONS_DC              0x20
 101
 102
 103 #define OSPF_DBD_FLAG_MS        1
 104 #define OSPF_DBD_FLAG_M         2
 105 #define OSPF_DBD_FLAG_I         4
 106
 107 #define OSPF_LS_REQ_LENGTH      12
 108
 109 #define OSPF_LSTYPE_ROUTER      1
 110 #define OSPF_LSTYPE_NETWORK     2
 111 #define OSPF_LSTYPE_SUMMERY     3
 112 #define OSPF_LSTYPE_ASBR        4
 113 #define OSPF_LSTYPE_ASEXT       5
 114 #define OSPF_LSTYPE_GRPMEMBER   6
 115 #define OSPF_LSTYPE_ASEXT7      7
 116 #define OSPF_LSTYPE_EXTATTR     8
 117 #define OSPF_V3_LSTYPE_ROUTER                0x2001
 118 #define OSPF_V3_LSTYPE_NETWORK               0x2002
 119 #define OSPF_V3_LSTYPE_INTER_AREA_PREFIX     0x2003
 120 #define OSPF_V3_LSTYPE_INTER_AREA_ROUTER     0x2004
 121 #define OSPF_V3_LSTYPE_AS_EXTERNAL           0x4005
 122 #define OSPF_V3_LSTYPE_GROUP_MEMBERSHIP      0x2006
 123 #define OSPF_V3_LSTYPE_TYPE_7                0x2007
 124 #define OSPF_V3_LSTYPE_LINK                  0x0008
 125 #define OSPF_V3_LSTYPE_INTRA_AREA_PREFIX     0x2009
 126
 127 /* Opaque LSA types */
 128 #define OSPF_LSTYPE_OP_LINKLOCAL 9
 129 #define OSPF_LSTYPE_OP_AREALOCAL 10
 130 #define OSPF_LSTYPE_OP_ASWIDE    11
 131
 132 #define OSPF_LINK_PTP           1
 133 #define OSPF_LINK_TRANSIT       2
 134 #define OSPF_LINK_STUB          3
 135 #define OSPF_LINK_VIRTUAL       4
 136
 137 #define OSPF_V3_LINK_PTP        1
 138 #define OSPF_V3_LINK_TRANSIT    2
 139 #define OSPF_V3_LINK_RESERVED   3
 140 #define OSPF_V3_LINK_VIRTUAL    4
 141
 142 #define OSPF_LSA_HEADER_LENGTH  20
 143
 144 /* Known opaque LSAs */
 145 #define OSPF_LSA_MPLS_TE        1
 146
 147
 148 static const value_string ls_type_vals[] = {
 149         {OSPF_LSTYPE_ROUTER,                  "Router-LSA"                   },
 150         {OSPF_LSTYPE_NETWORK,                 "Network-LSA"                  },
 151         {OSPF_LSTYPE_SUMMERY,                 "Summary-LSA (IP network)"     },
 152         {OSPF_LSTYPE_ASBR,                    "Summary-LSA (ASBR)"           },
 153         {OSPF_LSTYPE_ASEXT,                   "AS-External-LSA (ASBR)"       },
 154         {OSPF_LSTYPE_GRPMEMBER,               "Group Membership LSA"         },
 155         {OSPF_LSTYPE_ASEXT7,                  "NSSA AS-External-LSA"         },
 156         {OSPF_LSTYPE_EXTATTR,                 "External Attributes LSA"      },
 157         {OSPF_LSTYPE_OP_LINKLOCAL,            "Opaque LSA, Link-local scope" },
 158         {OSPF_LSTYPE_OP_AREALOCAL,            "Opaque LSA, Area-local scope" },
 159         {0,                                   NULL                           }
 160
 161 };
 162
 163 static const value_string v3_ls_type_vals[] = {
 164         {OSPF_V3_LSTYPE_ROUTER,               "Router-LSA"                   },
 165         {OSPF_V3_LSTYPE_NETWORK,              "Network-LSA"                  },
 166         {OSPF_V3_LSTYPE_INTER_AREA_PREFIX,    "Inter-Area-Prefix-LSA"        },
 167         {OSPF_V3_LSTYPE_INTER_AREA_ROUTER,    "Inter-Area-Router-LSA"        },
 168         {OSPF_V3_LSTYPE_AS_EXTERNAL,          "AS-External-LSA"              },
 169         {OSPF_V3_LSTYPE_GROUP_MEMBERSHIP,     "Group-Membership-LSA"         },
 170         {OSPF_V3_LSTYPE_TYPE_7,               "Type-LSA"                     },
 171         {OSPF_V3_LSTYPE_LINK,                 "Link-LSA"                     },
 172         {OSPF_V3_LSTYPE_INTRA_AREA_PREFIX,    "Intra-Area-Prefix-LSA"        },
 173         {0,                                   NULL                           }
 174
 175 };
 176
 177
 178 #define OSPF_V3_ROUTER_LSA_FLAG_B 0x01
 179 #define OSPF_V3_ROUTER_LSA_FLAG_E 0x02
 180 #define OSPF_V3_ROUTER_LSA_FLAG_V 0x04
 181 #define OSPF_V3_ROUTER_LSA_FLAG_W 0x08
 182
 183 #define OSPF_V3_PREFIX_OPTION_NU 0x01
 184 #define OSPF_V3_PREFIX_OPTION_LA 0x02
 185 #define OSPF_V3_PREFIX_OPTION_MC 0x04
 186 #define OSPF_V3_PREFIX_OPTION_P  0x08
 187
 188 #define OSPF_V3_AS_EXTERNAL_FLAG_T 0x01
 189 #define OSPF_V3_AS_EXTERNAL_FLAG_F 0x02
 190 #define OSPF_V3_AS_EXTERNAL_FLAG_E 0x04
 191
 192
 193 static int proto_ospf = -1;
 194
 195 static gint ett_ospf = -1;
 196 static gint ett_ospf_hdr = -1;
 197 static gint ett_ospf_hello = -1;
 198 static gint ett_ospf_desc = -1;
 199 static gint ett_ospf_lsr = -1;
 200 static gint ett_ospf_lsa = -1;
 201 static gint ett_ospf_lsa_upd = -1;
 202
 203 /* Trees for opaque LSAs */
 204 static gint ett_ospf_lsa_mpls = -1;
 205 static gint ett_ospf_lsa_mpls_router = -1;
 206 static gint ett_ospf_lsa_mpls_link = -1;
 207 static gint ett_ospf_lsa_mpls_link_stlv = -1;
 208
 209 static dissector_handle_t data_handle;
 210
 211 static void dissect_ospf_hello(tvbuff_t*, int, proto_tree*, guint8);
 212 static void dissect_ospf_db_desc(tvbuff_t*, int, proto_tree*, guint8);
 213 static void dissect_ospf_ls_req(tvbuff_t*, int, proto_tree*, guint8);
 214 static void dissect_ospf_ls_upd(tvbuff_t*, int, proto_tree*, guint8);
 215 static void dissect_ospf_ls_ack(tvbuff_t*, int, proto_tree*, guint8);
 216
 217 /* dissect_ospf_v[23]lsa returns the offset of the next LSA
 218  * if disassemble_body is set to FALSE (e.g. in LSA ACK
 219  * packets), the offset is set to the offset of the next
 220  * LSA header
 221  */
 222 static int dissect_ospf_v2_lsa(tvbuff_t*, int, proto_tree*, gboolean disassemble_body);
 223 static int dissect_ospf_v3_lsa(tvbuff_t*, int, proto_tree*, gboolean disassemble_body);
 224
 225 static void dissect_ospf_options(tvbuff_t *, int, proto_tree *, guint8);
 226
 227 static void dissect_ospf_v3_prefix_options(tvbuff_t *, int, proto_tree *);
 228
 229 static void dissect_ospf_v3_address_prefix(tvbuff_t *, int, int, proto_tree *);
 230
 231 static void
 232 dissect_ospf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 233 {
 234     proto_tree *ospf_tree = NULL;
 235     proto_item *ti;
 236     proto_tree *ospf_header_tree;
 237     guint8  version;
 238     guint8  packet_type;
 239     guint16 ospflen;
 240     vec_t cksum_vec[4];
 241     int cksum_vec_len;
 242     guint32 phdr[2];
 243     guint16 cksum, computed_cksum;
 244     guint length, reported_length;
 245     guint16 auth_type;
 246     char auth_data[8];
 247     int crypto_len;
 248     unsigned int ospf_header_length;
 249     guint8 instance_ID;
 250     guint8 reserved;
 251     guint32 areaid;
 252
 253
 254     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 255         col_set_str(pinfo->cinfo, COL_PROTOCOL, "OSPF");
 256     if (check_col(pinfo->cinfo, COL_INFO))
 257         col_clear(pinfo->cinfo, COL_INFO);
 258
 259     version = tvb_get_guint8(tvb, 0);
 260     switch (version) {
 261         case OSPF_VERSION_2:
 262             ospf_header_length = OSPF_VERSION_2_HEADER_LENGTH;
 263             break;
 264         case OSPF_VERSION_3:
 265             ospf_header_length = OSPF_VERSION_3_HEADER_LENGTH;
 266             break;
 267         default:
 268             ospf_header_length = 0;
 269             break;
 270     }
 271
 272     packet_type = tvb_get_guint8(tvb, 1);
 273     if (check_col(pinfo->cinfo, COL_INFO)) {
 274         col_add_str(pinfo->cinfo, COL_INFO,
 275                     val_to_str(packet_type, pt_vals, "Unknown (%u)"));
 276     }
 277
 278     if (tree) {
 279         ospflen = tvb_get_ntohs(tvb, 2);
 280
 281         ti = proto_tree_add_item(tree, proto_ospf, tvb, 0, ospflen, FALSE);
 282         ospf_tree = proto_item_add_subtree(ti, ett_ospf);
 283
 284         ti = proto_tree_add_text(ospf_tree, tvb, 0, ospf_header_length,
 285                                  "OSPF Header");
 286         ospf_header_tree = proto_item_add_subtree(ti, ett_ospf_hdr);
 287
 288         proto_tree_add_text(ospf_header_tree, tvb, 0, 1, "OSPF Version: %u",
 289                             version);
 290         proto_tree_add_text(ospf_header_tree, tvb, 1, 1, "OSPF Packet Type: %u (%s)",
 291                             packet_type,
 292                             val_to_str(packet_type, pt_vals, "Unknown"));
 293         proto_tree_add_text(ospf_header_tree, tvb, 2, 2, "Packet Length: %u",
 294                             ospflen);
 295         proto_tree_add_text(ospf_header_tree, tvb, 4, 4, "Source OSPF Router ID: %s",
 296                             ip_to_str(tvb_get_ptr(tvb, 4, 4)));
 297         areaid=tvb_get_ntohl(tvb,8);
 298         proto_tree_add_text(ospf_header_tree, tvb, 8, 4, "Area ID: %s%s",
 299                                ip_to_str(tvb_get_ptr(tvb, 8, 4)), areaid == 0 ? " (Backbone)" : "");
 300         cksum = tvb_get_ntohs(tvb, 12);
 301         length = tvb_length(tvb);
 302         /* XXX - include only the length from the OSPF header? */
 303         reported_length = tvb_reported_length(tvb);
 304         if (cksum == 0) {
 305                 /* No checksum supplied in the packet. */
 306                 proto_tree_add_text(ospf_header_tree, tvb, 12, 2,
 307                     "Packet Checksum: 0x%04x (none)", cksum);
 308         } else if (!pinfo->fragmented && length >= reported_length
 309                 && length >= ospf_header_length
 310                 && (version == OSPF_VERSION_2 || version == OSPF_VERSION_3)) {
 311             /* The packet isn't part of a fragmented datagram and isn't
 312                truncated, and we know how to checksum this version of
 313                OSPF, so we can checksum it. */
 314
 315             switch (version) {
 316
 317             case OSPF_VERSION_2:
 318                 /* Header, not including the authentication data (the OSPFv2
 319                    checksum excludes the 64-bit authentication field). */
 320                 cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, 16);
 321                 cksum_vec[0].len = 16;
 322                 if (length > ospf_header_length) {
 323                     /* Rest of the packet, again not including the
 324                        authentication data. */
 325                     reported_length -= ospf_header_length;
 326                     cksum_vec[1].ptr = tvb_get_ptr(tvb, ospf_header_length, reported_length);
 327                     cksum_vec[1].len = reported_length;
 328                     cksum_vec_len = 2;
 329                 } else {
 330                     /* There's nothing but a header. */
 331                     cksum_vec_len = 1;
 332                 }
 333                 break;
 334
 335             case OSPF_VERSION_3:
 336                 /* IPv6-style checksum, covering the entire OSPF packet
 337                    and a prepended IPv6 pseudo-header. */
 338
 339                 /* Set up the fields of the pseudo-header. */
 340                 cksum_vec[0].ptr = pinfo->src.data;
 341                 cksum_vec[0].len = pinfo->src.len;
 342                 cksum_vec[1].ptr = pinfo->dst.data;
 343                 cksum_vec[1].len = pinfo->dst.len;
 344                 cksum_vec[2].ptr = (const guint8 *)&phdr;
 345                 phdr[0] = htonl(ospflen);
 346                 phdr[1] = htonl(IP_PROTO_OSPF);
 347                 cksum_vec[2].len = 8;
 348
 349                 cksum_vec[3].ptr = tvb_get_ptr(tvb, 0, reported_length);
 350                 cksum_vec[3].len = reported_length;
 351                 cksum_vec_len = 4;
 352                 break;
 353
 354             default:
 355                 g_assert_not_reached();
 356                 cksum_vec_len = 0;
 357             }
 358             computed_cksum = in_cksum(cksum_vec, cksum_vec_len);
 359             if (computed_cksum == 0) {
 360                 proto_tree_add_text(ospf_header_tree, tvb, 12, 2,
 361                         "Packet Checksum: 0x%04x (correct)", cksum);
 362             } else {
 363                 proto_tree_add_text(ospf_header_tree, tvb, 12, 2,
 364                         "Packet Checksum: 0x%04x (incorrect, should be 0x%04x)",
 365                         cksum, in_cksum_shouldbe(cksum, computed_cksum));
 366             }
 367         } else {
 368             proto_tree_add_text(ospf_header_tree, tvb, 12, 2,
 369                 "Packet Checksum: 0x%04x", cksum);
 370         }
 371
 372
 373         /* Authentication is only valid for OSPFv2 */
 374         if ( version == OSPF_VERSION_2 ) {
 375             auth_type = tvb_get_ntohs(tvb, 14);
 376             proto_tree_add_text(ospf_header_tree, tvb, 14, 2, "Auth Type: %s",
 377                             val_to_str(auth_type, auth_vals, "Unknown (%u)"));
 378             switch (auth_type) {
 379
 380             case OSPF_AUTH_NONE:
 381                 proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data (none)");
 382                 break;
 383
 384             case OSPF_AUTH_SIMPLE:
 385                 tvb_get_nstringz0(tvb, 16, 8, auth_data);
 386                 proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data: %s", auth_data);
 387                 break;
 388
 389             case OSPF_AUTH_CRYPT:
 390                 proto_tree_add_text(ospf_header_tree, tvb, 18, 1, "Auth Key ID: %u",
 391                                 tvb_get_guint8(tvb, 18));
 392                 crypto_len = tvb_get_guint8(tvb, 19);
 393                 proto_tree_add_text(ospf_header_tree, tvb, 19, 1, "Auth Data Length: %u",
 394                                 crypto_len);
 395                 proto_tree_add_text(ospf_header_tree, tvb, 20, 4, "Auth Crypto Sequence Number: 0x%x",
 396                                 tvb_get_ntohl(tvb, 20));
 397
 398                 /* Show the message digest that was appended to the end of the
 399                    OSPF message - but only if it's present (we don't want
 400                    to get an exception before we've tried dissecting OSPF
 401                    message). */
 402                 if (tvb_bytes_exist(tvb, ospflen, crypto_len)) {
 403                     proto_tree_add_text(ospf_header_tree, tvb, ospflen, crypto_len,
 404                                     "Auth Data: %s",
 405                                     tvb_bytes_to_str(tvb, ospflen, crypto_len));
 406                 }
 407                 break;
 408
 409             default:
 410                 proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data (unknown)");
 411                 break;
 412             }
 413
 414         }
 415
 416         /* Instance ID and "reserved" is OSPFv3-only */
 417         if ( version == OSPF_VERSION_3 ) {
 418             instance_ID = tvb_get_guint8(tvb, 14);
 419             proto_tree_add_text(ospf_header_tree, tvb, 14, 1, "Instance ID: %u",
 420                             instance_ID);
 421             reserved = tvb_get_guint8(tvb, 15);
 422             proto_tree_add_text(ospf_header_tree, tvb, 15, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 423                                 reserved);
 424
 425         }
 426
 427         /* Adjust the length of the tvbuff to match the size of the OSPF
 428          * packet (since the dissect routines use it to work out where the
 429          * end of the OSPF packet is).
 430          */
 431         tvb_set_reported_length(tvb, ospflen);
 432
 433         switch (packet_type){
 434
 435         case OSPF_HELLO:
 436             dissect_ospf_hello(tvb, ospf_header_length, ospf_tree, version);
 437             break;
 438
 439         case OSPF_DB_DESC:
 440             dissect_ospf_db_desc(tvb, ospf_header_length, ospf_tree, version);
 441             break;
 442
 443         case OSPF_LS_REQ:
 444             dissect_ospf_ls_req(tvb, ospf_header_length, ospf_tree, version);
 445             break;
 446
 447         case OSPF_LS_UPD:
 448             dissect_ospf_ls_upd(tvb, ospf_header_length, ospf_tree, version);
 449             break;
 450
 451         case OSPF_LS_ACK:
 452             dissect_ospf_ls_ack(tvb, ospf_header_length, ospf_tree, version);
 453             break;
 454
 455         default:
 456             call_dissector(data_handle,tvb_new_subset(tvb, ospf_header_length,-1,tvb_reported_length_remaining(tvb,ospf_header_length)), pinfo, tree);
 457             break;
 458         }
 459     }
 460 }
 461
 462 static void
 463 dissect_ospf_hello(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 464 {
 465     proto_tree *ospf_hello_tree;
 466     proto_item *ti;
 467
 468     ti = proto_tree_add_text(tree, tvb, offset,
 469                              tvb_length_remaining(tvb, offset),
 470                              "OSPF Hello Packet");
 471     ospf_hello_tree = proto_item_add_subtree(ti, ett_ospf_hello);
 472
 473     switch (version ) {
 474         case OSPF_VERSION_2:
 475             proto_tree_add_text(ospf_hello_tree, tvb, offset, 4, "Network Mask: %s",
 476                         ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 477             proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 2,
 478                         "Hello Interval: %u seconds",
 479                         tvb_get_ntohs(tvb, offset + 4));
 480
 481             dissect_ospf_options(tvb, offset + 6, ospf_hello_tree, version);
 482             proto_tree_add_text(ospf_hello_tree, tvb, offset + 7, 1, "Router Priority: %u",
 483                         tvb_get_guint8(tvb, offset + 7));
 484             proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 4, "Router Dead Interval: %u seconds",
 485                         tvb_get_ntohl(tvb, offset + 8));
 486             proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s",
 487                         ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
 488             proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s",
 489                         ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
 490
 491             offset += 20;
 492             while (tvb_reported_length_remaining(tvb, offset) != 0) {
 493                 proto_tree_add_text(ospf_hello_tree, tvb, offset, 4,
 494                             "Active Neighbor: %s",
 495                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 496                 offset += 4;
 497             }
 498             break;
 499         case OSPF_VERSION_3:
 500             proto_tree_add_text(ospf_hello_tree, tvb, offset + 0, 4, "Interface ID: %u",
 501                         tvb_get_ntohl(tvb, offset + 0));
 502             proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 1, "Router Priority: %u",
 503                         tvb_get_guint8(tvb, offset + 4));
 504             dissect_ospf_options(tvb, offset + 5, ospf_hello_tree, version);
 505             proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 2,
 506                         "Hello Interval: %u seconds",
 507                         tvb_get_ntohs(tvb, offset + 8));
 508             proto_tree_add_text(ospf_hello_tree, tvb, offset + 10, 2, "Router Dead Interval: %u seconds",
 509                         tvb_get_ntohs(tvb, offset + 10));
 510             proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s",
 511                         ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
 512             proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s",
 513                         ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
 514             offset += 20;
 515             while (tvb_reported_length_remaining(tvb, offset) != 0) {
 516                 proto_tree_add_text(ospf_hello_tree, tvb, offset, 4,
 517                             "Active Neighbor: %s",
 518                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 519                 offset += 4;
 520             }
 521
 522             break;
 523
 524         default:
 525             break;
 526     }
 527 }
 528
 529 static void
 530 dissect_ospf_db_desc(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 531 {
 532     proto_tree *ospf_db_desc_tree=NULL;
 533     proto_item *ti;
 534     guint8 flags;
 535     guint8 reserved;
 536     char flags_string[20] = "";
 537
 538     if (tree) {
 539         ti = proto_tree_add_text(tree, tvb, offset,
 540                                  tvb_length_remaining(tvb, offset),
 541                                  "OSPF DB Description");
 542         ospf_db_desc_tree = proto_item_add_subtree(ti, ett_ospf_desc);
 543
 544         switch (version ) {
 545
 546             case OSPF_VERSION_2:
 547
 548                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 2, "Interface MTU: %u",
 549                             tvb_get_ntohs(tvb, offset));
 550
 551                 dissect_ospf_options(tvb, offset + 2, ospf_db_desc_tree, version);
 552
 553                 flags = tvb_get_guint8(tvb, offset + 3);
 554                 if (flags & OSPF_DBD_FLAG_MS)
 555                     strcat(flags_string, "MS");
 556                 if (flags & OSPF_DBD_FLAG_M) {
 557                     if (flags_string[0] != '\0')
 558                         strcat(flags_string, "/");
 559                     strcat(flags_string, "M");
 560                 }
 561                 if (flags & OSPF_DBD_FLAG_I) {
 562                     if (flags_string[0] != '\0')
 563                         strcat(flags_string, "/");
 564                     strcat(flags_string, "I");
 565                 }
 566                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 3, 1, "Flags: 0x%x (%s)",
 567                             flags, flags_string);
 568                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 4, "DD Sequence: %u",
 569                             tvb_get_ntohl(tvb, offset + 4));
 570
 571                 offset += 8;
 572                 break;
 573
 574             case OSPF_VERSION_3:
 575
 576                 reserved = tvb_get_guint8(tvb, offset);
 577                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 578                                 reserved);
 579
 580                 dissect_ospf_options(tvb, offset + 1, ospf_db_desc_tree, version);
 581
 582                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 2, "Interface MTU: %u",
 583                             tvb_get_ntohs(tvb, offset+4));
 584
 585                 reserved = tvb_get_guint8(tvb, offset + 6);
 586                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 6, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 587                                 reserved);
 588
 589                 flags = tvb_get_guint8(tvb, offset + 7);
 590                 if (flags & OSPF_DBD_FLAG_MS)
 591                     strcat(flags_string, "MS");
 592                 if (flags & OSPF_DBD_FLAG_M) {
 593                     if (flags_string[0] != '\0')
 594                         strcat(flags_string, "/");
 595                     strcat(flags_string, "M");
 596                 }
 597                 if (flags & OSPF_DBD_FLAG_I) {
 598                     if (flags_string[0] != '\0')
 599                         strcat(flags_string, "/");
 600                     strcat(flags_string, "I");
 601                 }
 602                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 7, 1, "Flags: 0x%x (%s)",
 603                             flags, flags_string);
 604
 605                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 8, 4, "DD Sequence: %u",
 606                             tvb_get_ntohl(tvb, offset + 8));
 607
 608                 offset += 12;
 609                 break;
 610
 611             default:
 612                 break;
 613         }
 614     }
 615
 616     /* LS Headers will be processed here */
 617     /* skip to the end of DB-Desc header */
 618     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 619       if ( version == OSPF_VERSION_2)
 620           offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE);
 621       else
 622           if ( version == OSPF_VERSION_3)
 623               offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE);
 624     }
 625
 626 }
 627
 628 static void
 629 dissect_ospf_ls_req(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 630 {
 631     proto_tree *ospf_lsr_tree;
 632     proto_item *ti;
 633     guint32 ls_type;
 634     guint8 reserved;
 635
 636     /* zero or more LS requests may be within a LS Request */
 637     /* we place every request for a LSA in a single subtree */
 638     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 639         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LS_REQ_LENGTH,
 640                                  "Link State Request");
 641         ospf_lsr_tree = proto_item_add_subtree(ti, ett_ospf_lsr);
 642
 643         reserved = tvb_get_guint8(tvb, offset);
 644         proto_tree_add_text(ospf_lsr_tree, tvb, offset, 1,
 645            (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 646                                 reserved);
 647
 648         switch ( version ) {
 649
 650             case OSPF_VERSION_2:
 651                 ls_type = tvb_get_ntohl(tvb, offset);
 652                 proto_tree_add_text(ospf_lsr_tree, tvb, offset, 4, "LS Type: %s (%u)",
 653                             val_to_str(ls_type, ls_type_vals, "Unknown"),
 654                             ls_type);
 655                 break;
 656             case OSPF_VERSION_3:
 657                 ls_type = tvb_get_ntohs(tvb, offset+2);
 658                 proto_tree_add_text(ospf_lsr_tree, tvb, offset+2, 2, "LS Type: %s (0x%04x)",
 659                             val_to_str(ls_type, v3_ls_type_vals, "Unknown"),
 660                             ls_type);
 661                   break;
 662             default:
 663                  ls_type=0;
 664                  break;
 665         }
 666
 667
 668         proto_tree_add_text(ospf_lsr_tree, tvb, offset + 4, 4, "Link State ID: %s",
 669                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
 670         proto_tree_add_text(ospf_lsr_tree, tvb, offset + 8, 4, "Advertising Router: %s",
 671                             ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
 672
 673         offset += 12;
 674     }
 675 }
 676
 677 static void
 678 dissect_ospf_ls_upd(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 679 {
 680     proto_tree *ospf_lsa_upd_tree=NULL;
 681     proto_item *ti;
 682     guint32 lsa_nr;
 683     guint32 lsa_counter;
 684
 685     ti = proto_tree_add_text(tree, tvb, offset,
 686                              tvb_length_remaining(tvb, offset),
 687                              "LS Update Packet");
 688     ospf_lsa_upd_tree = proto_item_add_subtree(ti, ett_ospf_lsa_upd);
 689
 690     lsa_nr = tvb_get_ntohl(tvb, offset);
 691     proto_tree_add_text(ospf_lsa_upd_tree, tvb, offset, 4, "Number of LSAs: %u",
 692                         lsa_nr);
 693     /* skip to the beginning of the first LSA */
 694     offset += 4; /* the LS Upd Packet contains only a 32 bit #LSAs field */
 695
 696     lsa_counter = 0;
 697     while (lsa_counter < lsa_nr) {
 698         if ( version == OSPF_VERSION_2)
 699             offset = dissect_ospf_v2_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE);
 700         else
 701             if ( version == OSPF_VERSION_3)
 702                 offset = dissect_ospf_v3_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE);
 703         lsa_counter += 1;
 704     }
 705 }
 706
 707 static void
 708 dissect_ospf_ls_ack(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 709 {
 710     /* the body of a LS Ack packet simply contains zero or more LSA Headers */
 711     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 712         if ( version == OSPF_VERSION_2)
 713             offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE);
 714         else
 715             if ( version == OSPF_VERSION_3)
 716               offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE);
 717     }
 718 }
 719
 720 /*
 721  * Returns if an LSA is opaque, i.e. requires special treatment
 722  */
 723 static int
 724 is_opaque(int lsa_type)
 725 {
 726     return (lsa_type >= OSPF_LSTYPE_OP_LINKLOCAL &&
 727         lsa_type <= OSPF_LSTYPE_OP_ASWIDE);
 728 }
 729
 730 /* MPLS/TE TLV types */
 731 #define MPLS_TLV_ROUTER    1
 732 #define MPLS_TLV_LINK      2
 733
 734 /* MPLS/TE Link STLV types */
 735 enum {
 736     MPLS_LINK_TYPE       = 1,
 737     MPLS_LINK_ID,
 738     MPLS_LINK_LOCAL_IF,
 739     MPLS_LINK_REMOTE_IF,
 740     MPLS_LINK_TE_METRIC,
 741     MPLS_LINK_MAX_BW,
 742     MPLS_LINK_MAX_RES_BW,
 743     MPLS_LINK_UNRES_BW,
 744     MPLS_LINK_COLOR,
 745 };
 746
 747 static const value_string mpls_link_stlv_str[] = {
 748     {MPLS_LINK_TYPE, "Link Type"},
 749     {MPLS_LINK_ID, "Link ID"},
 750     {MPLS_LINK_LOCAL_IF, "Local Interface IP Address"},
 751     {MPLS_LINK_REMOTE_IF, "Remote Interface IP Address"},
 752     {MPLS_LINK_TE_METRIC, "Traffic Engineering Metric"},
 753     {MPLS_LINK_MAX_BW, "Maximum Bandwidth"},
 754     {MPLS_LINK_MAX_RES_BW, "Maximum Reservable Bandwidth"},
 755     {MPLS_LINK_UNRES_BW, "Unreserved Bandwidth"},
 756     {MPLS_LINK_COLOR, "Resource Class/Color"},
 757     {0, NULL},
 758 };
 759
 760 /*
 761  * Dissect MPLS/TE opaque LSA
 762  */
 763 static void
 764 dissect_ospf_lsa_mpls(tvbuff_t *tvb, int offset, proto_tree *tree,
 765                       guint32 length)
 766 {
 767     proto_item *ti;
 768     proto_tree *mpls_tree;
 769     proto_tree *tlv_tree;
 770     proto_tree *stlv_tree;
 771
 772     int tlv_type;
 773     int tlv_length;
 774     int tlv_end_offset;
 775
 776     int stlv_type, stlv_len, stlv_offset;
 777     char *stlv_name;
 778     int i;
 779
 780     ti = proto_tree_add_text(tree, tvb, offset, length,
 781                              "MPLS Traffic Engineering LSA");
 782     mpls_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls);
 783
 784     while (length != 0) {
 785         tlv_type = tvb_get_ntohs(tvb, offset);
 786         tlv_length = tvb_get_ntohs(tvb, offset + 2);
 787         tlv_end_offset = offset + tlv_length + 4;
 788
 789         switch (tlv_type) {
 790
 791         case MPLS_TLV_ROUTER:
 792             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 793                                      "Router Address: %s",
 794                                      ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
 795             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_router);
 796             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 1 - Router Address");
 797             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 798                                 tlv_length);
 799             proto_tree_add_text(tlv_tree, tvb, offset+4, 4, "Router Address: %s",
 800                                 ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
 801             break;
 802
 803         case MPLS_TLV_LINK:
 804             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 805                                      "Link Information");
 806             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link);
 807             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 2 - Link Information");
 808             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 809                                 tlv_length);
 810             stlv_offset = offset + 4;
 811
 812             /* Walk down the sub-TLVs for link information */
 813             while (stlv_offset < tlv_end_offset) {
 814                 stlv_type = tvb_get_ntohs(tvb, stlv_offset);
 815                 stlv_len = tvb_get_ntohs(tvb, stlv_offset + 2);
 816                 stlv_name = val_to_str(stlv_type, mpls_link_stlv_str, "Unknown sub-TLV");
 817                 switch (stlv_type) {
 818
 819                 case MPLS_LINK_TYPE:
 820                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 821                                              "%s: %u", stlv_name,
 822                                              tvb_get_guint8(tvb, stlv_offset + 4));
 823                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 824                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 825                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 826                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 827                                         stlv_len);
 828                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 1, "%s: %u", stlv_name,
 829                                         tvb_get_guint8(tvb, stlv_offset + 4));
 830                     break;
 831
 832                 case MPLS_LINK_ID:
 833                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 834                                              "%s: %s (%x)", stlv_name,
 835                                              ip_to_str(tvb_get_ptr(tvb, stlv_offset + 4, 4)),
 836                                              tvb_get_ntohl(tvb, stlv_offset + 4));
 837                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 838                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 839                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 840                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 841                                         stlv_len);
 842                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %s (%x)", stlv_name,
 843                                         ip_to_str(tvb_get_ptr(tvb, stlv_offset + 4, 4)),
 844                                         tvb_get_ntohl(tvb, stlv_offset + 4));
 845                     break;
 846
 847                 case MPLS_LINK_LOCAL_IF:
 848                 case MPLS_LINK_REMOTE_IF:
 849                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 850                                              "%s", stlv_name);
 851                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 852                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 853                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 854                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 855                                         stlv_len);
 856                     /*   The Local/Remote Interface IP Address sub-TLV is TLV type 3/4, and is 4N
 857                        octets in length, where N is the number of neighbor addresses. */
 858                     for (i=0; i < stlv_len; i+=4)
 859                       proto_tree_add_text(stlv_tree, tvb, stlv_offset+4+i, 4, "%s: %s", stlv_name,
 860                                           ip_to_str(tvb_get_ptr(tvb, stlv_offset+4+i, 4)));
 861                     break;
 862
 863                 case MPLS_LINK_TE_METRIC:
 864                 case MPLS_LINK_COLOR:
 865                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 866                                              "%s: %u", stlv_name,
 867                                              tvb_get_ntohl(tvb, stlv_offset + 4));
 868                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 869                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 870                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 871                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 872                                         stlv_len);
 873                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %u", stlv_name,
 874                                         tvb_get_ntohl(tvb, stlv_offset + 4));
 875                     break;
 876
 877                 case MPLS_LINK_MAX_BW:
 878                 case MPLS_LINK_MAX_RES_BW:
 879                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 880                                              "%s: %ld", stlv_name,
 881                                              tvb_ieee_to_long(tvb, stlv_offset + 4));
 882                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 883                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 884                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 885                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 886                                         stlv_len);
 887                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %ld", stlv_name,
 888                                         tvb_ieee_to_long(tvb, stlv_offset + 4));
 889                     break;
 890
 891                 case MPLS_LINK_UNRES_BW:
 892                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 893                                              "%s", stlv_name);
 894                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 895                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 896                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 897                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 898                                         stlv_len);
 899                     for (i = 0; i < 8; i++) {
 900                         proto_tree_add_text(stlv_tree, tvb, stlv_offset+4+(i*4), 4,
 901                                             "Pri %d: %ld", i,
 902                                             tvb_ieee_to_long(tvb, stlv_offset + 4 + i*4));
 903                     }
 904                     break;
 905
 906                 default:
 907                     proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 908                                         "Unknown Link sub-TLV: %u", stlv_type);
 909                     break;
 910                 }
 911                 stlv_offset += ((stlv_len+4+3)/4)*4;
 912             }
 913             break;
 914
 915         default:
 916             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 917                                      "Unknown LSA: %u", tlv_type);
 918             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link);
 919             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: %u - Unknown",
 920                                 tlv_type);
 921             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 922                                 tlv_length);
 923             proto_tree_add_text(tlv_tree, tvb, offset+4, tlv_length, "TLV Data");
 924             break;
 925         }
 926
 927         offset += tlv_length + 4;
 928         length -= tlv_length + 4;
 929     }
 930 }
 931
 932 /*
 933  * Dissect opaque LSAs
 934  */
 935 void
 936 dissect_ospf_lsa_opaque(tvbuff_t *tvb, int offset, proto_tree *tree,
 937                         guint8 ls_id_type, guint32 length)
 938 {
 939     switch (ls_id_type) {
 940
 941     case OSPF_LSA_MPLS_TE:
 942         dissect_ospf_lsa_mpls(tvb, offset, tree, length);
 943         break;
 944
 945     default:
 946         proto_tree_add_text(tree, tvb, offset, length,
 947                             "Unknown LSA Type %u", ls_id_type);
 948         break;
 949     } /* switch on opaque LSA id */
 950 }
 951
 952 static int
 953 dissect_ospf_v2_lsa(tvbuff_t *tvb, int offset, proto_tree *tree,
 954                  gboolean disassemble_body)
 955 {
 956     proto_tree *ospf_lsa_tree;
 957     proto_item *ti;
 958
 959     guint8               ls_type;
 960     guint16              ls_length;
 961     int                  end_offset;
 962     guint8               nr_links;
 963     guint16              nr_tos;
 964
 965     /* router LSA */
 966     guint8               link_type;
 967     guint16              link_counter;
 968     guint8               tos_counter;
 969     char                *link_type_str;
 970     char                *link_id;
 971
 972     /* AS-external LSA */
 973     guint8               options;
 974
 975     /* opaque LSA */
 976     guint8               ls_id_type;
 977
 978     ls_type = tvb_get_guint8(tvb, offset + 3);
 979     ls_length = tvb_get_ntohs(tvb, offset + 18);
 980     end_offset = offset + ls_length;
 981
 982     if (disassemble_body) {
 983         ti = proto_tree_add_text(tree, tvb, offset, ls_length,
 984                                  "%s (Type: %u)", val_to_str(ls_type, ls_type_vals,"Unkown"), ls_type);
 985     } else {
 986         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH,
 987                                  "LSA Header");
 988     }
 989     ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa);
 990
 991     proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds",
 992                         tvb_get_ntohs(tvb, offset));
 993     dissect_ospf_options(tvb, offset + 2, ospf_lsa_tree, OSPF_VERSION_2);
 994     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 3, 1, "LSA Type: %u (%s)",
 995                         ls_type, val_to_str(ls_type,ls_type_vals,"Unknown"));
 996
 997     if (is_opaque(ls_type)) {
 998         ls_id_type = tvb_get_guint8(tvb, offset + 4);
 999         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 1, "Link State ID Opaque Type: %u",
1000                             ls_id_type);
1001         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 5, 3, "Link State ID Opaque ID: %u",
1002                             tvb_get_ntoh24(tvb, offset + 5));
1003     } else {
1004         ls_id_type = 0;
1005         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s",
1006                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1007     }
1008
1009     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Advertising Router: %s",
1010                         ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1011     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: 0x%04x",
1012                         tvb_get_ntohl(tvb, offset + 12));
1013     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x",
1014                         tvb_get_ntohs(tvb, offset + 16));
1015
1016     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u",
1017                         ls_length);
1018
1019     /* skip past the LSA header to the body */
1020     offset += OSPF_LSA_HEADER_LENGTH;
1021     ls_length -= OSPF_LSA_HEADER_LENGTH;
1022
1023     if (!disassemble_body)
1024         return offset;
1025
1026     switch (ls_type){
1027
1028     case OSPF_LSTYPE_ROUTER:
1029         /* again: flags should be secified in detail */
1030         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x",
1031                             tvb_get_guint8(tvb, offset));
1032         nr_links = tvb_get_ntohs(tvb, offset + 2);
1033         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "Number of Links: %u",
1034                             nr_links);
1035         offset += 4;
1036         /* nr_links links follow
1037          * maybe we should put each of the links into its own subtree ???
1038          */
1039         for (link_counter = 1; link_counter <= nr_links; link_counter++) {
1040             /* check the Link Type and ID */
1041             link_type = tvb_get_guint8(tvb, offset + 8);
1042             switch (link_type) {
1043
1044             case OSPF_LINK_PTP:
1045                 link_type_str="Point-to-point connection to another router";
1046                 link_id="Neighboring router's Router ID";
1047                 break;
1048
1049             case OSPF_LINK_TRANSIT:
1050                 link_type_str="Connection to a transit network";
1051                 link_id="IP address of Designated Router";
1052                 break;
1053
1054             case OSPF_LINK_STUB:
1055                 link_type_str="Connection to a stub network";
1056                 link_id="IP network/subnet number";
1057                 break;
1058
1059             case OSPF_LINK_VIRTUAL:
1060                 link_type_str="Virtual link";
1061                 link_id="Neighboring router's Router ID";
1062                 break;
1063
1064             default:
1065                 link_type_str="Unknown link type";
1066                 link_id="Unknown link ID";
1067                 break;
1068             }
1069
1070             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "%s: %s", link_id,
1071                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1072
1073             /* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
1074             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link Data: %s",
1075                                 ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1076
1077             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 1, "Link Type: %u - %s",
1078                                 link_type, link_type_str);
1079             nr_tos = tvb_get_guint8(tvb, offset + 9);
1080             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 9, 1, "Number of TOS metrics: %u",
1081                                 nr_tos);
1082             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 10, 2, "TOS 0 metric: %u",
1083                                 tvb_get_ntohs(tvb, offset + 10));
1084
1085             offset += 12;
1086
1087             /* nr_tos metrics may follow each link
1088              * ATTENTION: TOS metrics are not tested (I don't have TOS
1089              * based routing)
1090              * please send me a mail if it is/isn't working
1091              */
1092             for (tos_counter = 1; tos_counter <= nr_tos; tos_counter++) {
1093                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1094                                     tvb_get_guint8(tvb, offset),
1095                                     tvb_get_ntohs(tvb, offset + 2));
1096                 offset += 4;
1097             }
1098         }
1099         break;
1100
1101     case OSPF_LSTYPE_NETWORK:
1102         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1103                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1104         offset += 4;
1105
1106         while (offset < end_offset) {
1107             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s",
1108                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1109             offset += 4;
1110         }
1111         break;
1112
1113     case OSPF_LSTYPE_SUMMERY:
1114     /* Type 3 and 4 LSAs have the same format */
1115     case OSPF_LSTYPE_ASBR:
1116         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1117                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1118         offset += 4;
1119
1120         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Metric: %u",
1121                             tvb_get_ntoh24(tvb, offset + 1));
1122         offset += 4;
1123
1124         /* TOS-specific information, if any */
1125         while (offset < end_offset) {
1126             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1127                                 tvb_get_guint8(tvb, offset),
1128                                 tvb_get_ntoh24(tvb, offset + 1));
1129             offset += 4;
1130         }
1131         break;
1132
1133     case OSPF_LSTYPE_ASEXT:
1134     case OSPF_LSTYPE_ASEXT7:
1135         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1136                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1137         offset += 4;
1138
1139         options = tvb_get_guint8(tvb, offset);
1140         if (options & 0x80) { /* check wether or not E bit is set */
1141             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1142                     "External Type: Type 2 (metric is larger than any other link state path)");
1143         } else {
1144             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1145                     "External Type: Type 1 (metric is specified in the same units as interface cost)");
1146         }
1147         /* the metric field of a AS-external LAS is specified in 3 bytes */
1148         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3, "Metric: %u",
1149                             tvb_get_ntoh24(tvb, offset + 1));
1150         offset += 4;
1151
1152         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s",
1153                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1154         offset += 4;
1155
1156         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u",
1157                             tvb_get_ntohl(tvb, offset));
1158         offset += 4;
1159
1160         /* TOS-specific information, if any */
1161         while (offset < end_offset) {
1162             options = tvb_get_guint8(tvb, offset);
1163             if (options & 0x80) { /* check wether or not E bit is set */
1164                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1165                         "External Type: Type 2 (metric is larger than any other link state path)");
1166             } else {
1167                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1168                         "External Type: Type 1 (metric is specified in the same units as interface cost)");
1169             }
1170             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1171                                 options & 0x7F,
1172                                 tvb_get_ntoh24(tvb, offset + 1));
1173             offset += 4;
1174
1175             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s",
1176                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1177             offset += 4;
1178
1179             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u",
1180                                 tvb_get_ntohl(tvb, offset));
1181             offset += 4;
1182         }
1183         break;
1184
1185     case OSPF_LSTYPE_OP_LINKLOCAL:
1186     case OSPF_LSTYPE_OP_AREALOCAL:
1187     case OSPF_LSTYPE_OP_ASWIDE:
1188         dissect_ospf_lsa_opaque(tvb, offset, ospf_lsa_tree, ls_id_type,
1189                                 ls_length);
1190         offset += ls_length;
1191         break;
1192
1193     default:
1194         /* unknown LSA type */
1195         proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1196                             "Unknown LSA Type");
1197         offset += ls_length;
1198         break;
1199     }
1200     /* return the offset of the next LSA */
1201     return offset;
1202 }
1203
1204 static int
1205 dissect_ospf_v3_lsa(tvbuff_t *tvb, int offset, proto_tree *tree,
1206                  gboolean disassemble_body)
1207 {
1208     proto_tree *ospf_lsa_tree;
1209     proto_item *ti;
1210
1211     guint16              ls_type;
1212     guint16              ls_length;
1213     int                  end_offset;
1214     guint8               reserved;
1215
1216     /* router LSA */
1217     guint8               link_type;
1218     char                *link_type_str;
1219     guint32              metric;
1220
1221     guint8               router_lsa_flags;
1222     char                 router_lsa_flags_string[5];
1223
1224     guint8               router_priority;
1225     guint32              number_prefixes;
1226     guint8               prefix_length;
1227     guint16              reserved16;
1228
1229     guint16              referenced_ls_type;
1230
1231     guint8               flags;
1232     guint8               flags_string[4];
1233     guint32              external_route_tag;
1234
1235
1236     ls_type = tvb_get_ntohs(tvb, offset + 2);
1237     ls_length = tvb_get_ntohs(tvb, offset + 18);
1238     end_offset = offset + ls_length;
1239
1240     if (disassemble_body) {
1241         ti = proto_tree_add_text(tree, tvb, offset, ls_length,
1242                                  "%s (Type: 0x%04x)", val_to_str(ls_type, v3_ls_type_vals,"Unknown"), ls_type);
1243     } else {
1244         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH,
1245                                  "LSA Header");
1246     }
1247     ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa);
1248
1249     proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds",
1250                         tvb_get_ntohs(tvb, offset));
1251
1252     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "LSA Type: 0x%04x (%s)",
1253                         ls_type, val_to_str(ls_type, v3_ls_type_vals,"Unkown"));
1254
1255     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s",
1256                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1257
1258     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Advertising Router: %s",
1259                         ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1260     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: %d",
1261                         tvb_get_ntohl(tvb, offset + 12));
1262     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x",
1263                         tvb_get_ntohs(tvb, offset + 16));
1264
1265     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u",
1266                         ls_length);
1267
1268     /* skip past the LSA header to the body */
1269     offset += OSPF_LSA_HEADER_LENGTH;
1270     ls_length -= OSPF_LSA_HEADER_LENGTH;
1271
1272     if (!disassemble_body)
1273         return offset;
1274
1275     switch (ls_type){
1276
1277
1278     case OSPF_V3_LSTYPE_ROUTER:
1279
1280       /* flags field in an router-lsa */
1281         router_lsa_flags=tvb_get_guint8(tvb,offset);
1282         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_B)
1283             router_lsa_flags_string[3] = 'B';
1284         else
1285             router_lsa_flags_string[3] = '.';
1286         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_E)
1287             router_lsa_flags_string[2] = 'E';
1288         else
1289             router_lsa_flags_string[2] = '.';
1290         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_V)
1291             router_lsa_flags_string[1] = 'V';
1292         else
1293             router_lsa_flags_string[1] = '.';
1294         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_W)
1295             router_lsa_flags_string[0] = 'W';
1296         else
1297             router_lsa_flags_string[0] = '.';
1298
1299         router_lsa_flags_string[4]=0;
1300
1301         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)",
1302                             router_lsa_flags, router_lsa_flags_string);
1303
1304         /* options field in an router-lsa */
1305         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1306
1307         /* skip the router-lsa flags and options */
1308         offset+=4;
1309         ls_length-=4;
1310
1311         if (ls_length > 0)
1312              proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1313                    "Router Interfaces:");
1314
1315         /* scan all router-lsa router interfaces */
1316         /* maybe we should put each of the links into its own subtree ??? */
1317         while (ls_length > 0 ) {
1318
1319             /* check the type */
1320             link_type = tvb_get_guint8(tvb, offset);
1321             switch (link_type) {
1322
1323                 case OSPF_V3_LINK_PTP:
1324                     link_type_str="Point-to-point connection to another router";
1325                     break;
1326
1327                 case OSPF_V3_LINK_TRANSIT:
1328                     link_type_str="Connection to a transit network";
1329                     break;
1330
1331                 case OSPF_V3_LINK_RESERVED:
1332                     link_type_str="Connection to a stub network";
1333                     break;
1334
1335                 case OSPF_V3_LINK_VIRTUAL:
1336                     link_type_str="Virtual link";
1337                     break;
1338
1339                 default:
1340                     link_type_str="Unknown link type";
1341                     break;
1342             }
1343
1344             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Type: %u (%s)", link_type,link_type_str);
1345
1346             /* reserved field */
1347             reserved = tvb_get_guint8(tvb, offset+1);
1348             proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 1,
1349                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1350
1351             /* metric */
1352             metric=tvb_get_ntohs(tvb, offset+2);
1353             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2,"Metric: %u",metric);
1354
1355             /* Interface ID */
1356             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Interface ID: %u",
1357                         tvb_get_ntohl(tvb, offset + 4));
1358
1359             /* Neighbor Interface ID */
1360             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Neighbor Interface ID: %u",
1361                         tvb_get_ntohl(tvb, offset + 8));
1362
1363             /* Neighbor Router ID */
1364             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "Neighbor Router ID: %s",
1365                 ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
1366
1367             /* skip to the (possible) next entry */
1368             offset+=16;
1369             ls_length-=16;
1370
1371         }
1372         break;
1373
1374     case OSPF_V3_LSTYPE_NETWORK:
1375
1376         /* reserved field */
1377         reserved = tvb_get_guint8(tvb, offset);
1378         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1379                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1380
1381         /* options field in an network-lsa */
1382         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1383
1384         offset += 4;
1385         ls_length-=4;
1386
1387         while (ls_length > 0 ) {
1388             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s",
1389                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1390             ls_length-=4;
1391             offset += 4;
1392         }
1393         break;
1394
1395
1396     case OSPF_V3_LSTYPE_INTER_AREA_PREFIX:
1397
1398         /* reserved field */
1399         reserved = tvb_get_guint8(tvb, offset);
1400         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1401                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1402
1403         /* metric */
1404         metric=tvb_get_ntoh24(tvb, offset+11);
1405         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3,"Metric: %u",metric);
1406
1407         /* prefix length */
1408         prefix_length=tvb_get_guint8(tvb, offset+4);
1409         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length);
1410
1411         /* prefix options */
1412         dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree);
1413
1414         /* 16 bits reserved */
1415         reserved16=tvb_get_ntohs(tvb, offset+6);
1416         proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2,
1417                (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16);
1418
1419         offset+=8;
1420
1421         /* address_prefix */
1422         dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1423
1424         offset+=(prefix_length+31)/32*4;
1425
1426         break;
1427
1428
1429     case OSPF_V3_LSTYPE_INTER_AREA_ROUTER:
1430
1431         /* reserved field */
1432         reserved = tvb_get_guint8(tvb, offset);
1433         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1434                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1435
1436         /* options field in an inter-area-router-lsa */
1437         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1438
1439         /* reserved field */
1440         reserved = tvb_get_guint8(tvb, offset+4);
1441         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1,
1442                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1443
1444         /* metric */
1445         metric=tvb_get_ntoh24(tvb, offset+6);
1446         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 6, 3,"Metric: %u",metric);
1447
1448         /* Destination Router ID */
1449         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Destination Router ID: %s",
1450                 ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1451
1452         offset+=12;
1453         break;
1454
1455
1456     case OSPF_V3_LSTYPE_AS_EXTERNAL:
1457
1458         /* flags */
1459         flags=tvb_get_guint8(tvb, offset);
1460         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_E)
1461             flags_string[0] = 'E';
1462         else
1463             flags_string[0] = '.';
1464         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_F)
1465             flags_string[1] = 'F';
1466         else
1467             flags_string[1] = '.';
1468         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_T)
1469             flags_string[2] = 'T';
1470         else
1471             flags_string[2] = '.';
1472
1473         flags_string[3]=0;
1474
1475         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)",
1476                             flags, flags_string);
1477
1478         /* 24 bits metric */
1479         metric=tvb_get_ntoh24(tvb, offset+1);
1480         proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 3,
1481                                 "Metric: %u", metric);
1482
1483         /* prefix length */
1484         prefix_length=tvb_get_guint8(tvb, offset+4);
1485         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length);
1486
1487         /* prefix options */
1488         dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree);
1489
1490         /* referenced LS type */
1491         referenced_ls_type=tvb_get_ntohs(tvb, offset+6);
1492         proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2,"Referenced LS type 0x%04x (%s)",
1493                             referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown"));
1494
1495         offset+=8;
1496
1497         /* address_prefix */
1498         dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1499
1500         offset+=(prefix_length+31)/32*4;
1501
1502         /* Forwarding Address (optional - only if F-flag is on) */
1503         if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_F) ) {
1504             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 16,"Forwarding Address: %s",
1505               ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset, 16)));
1506
1507             offset+=16;
1508         }
1509
1510         /* External Route Tag (optional - only if T-flag is on) */
1511         if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_T) ) {
1512             external_route_tag=tvb_get_ntohl(tvb, offset);
1513             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4,"External Route Tag: 0x%04x",
1514                                 external_route_tag);
1515
1516             offset+=4;
1517         }
1518
1519         /* Referenced Link State ID (optional - only if Referenced LS type is non-zero */
1520         if ( (offset < end_offset) && (referenced_ls_type != 0) ) {
1521             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Referenced Link State ID: %s",
1522                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1523             offset+=4;
1524         }
1525
1526         break;
1527
1528     case OSPF_V3_LSTYPE_LINK:
1529
1530         /* router priority */
1531         router_priority=tvb_get_guint8(tvb, offset);
1532         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Router Priority: %u", router_priority);
1533
1534         /* options field in an link-lsa */
1535         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1536
1537         /* Link-local Interface Address */
1538         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 16, "Link-local Interface Address: %s",
1539            ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, 16)));
1540
1541         /* Number prefixes */
1542         number_prefixes=tvb_get_ntohl(tvb, offset + 20);
1543         proto_tree_add_text(ospf_lsa_tree, tvb, offset+20, 4, "# prefixes: %d",number_prefixes);
1544
1545         offset+=24;
1546
1547         while (number_prefixes > 0) {
1548
1549             /* prefix length */
1550             prefix_length=tvb_get_guint8(tvb, offset);
1551             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length);
1552
1553             /* prefix options */
1554             dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree);
1555
1556             /* 16 bits reserved */
1557             reserved16=tvb_get_ntohs(tvb, offset+2);
1558             proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,
1559                (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16);
1560
1561             offset+=4;
1562
1563             /* address_prefix */
1564             dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1565
1566             offset+=(prefix_length+31)/32*4;
1567
1568             number_prefixes--;
1569
1570         }
1571         break;
1572
1573     case OSPF_V3_LSTYPE_INTRA_AREA_PREFIX:
1574
1575         /* # prefixes */
1576         number_prefixes=tvb_get_ntohs(tvb, offset);
1577         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2,"# prefixes: %u",number_prefixes);
1578
1579         /* referenced LS type */
1580         referenced_ls_type=tvb_get_ntohs(tvb, offset+2);
1581         proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,"Referenced LS type 0x%04x (%s)",
1582                             referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown"));
1583
1584         /* Referenced Link State ID */
1585         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Referenced Link State ID: %s",
1586                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1587
1588         /* Referenced Advertising Router */
1589         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Referenced Advertising Router: %s",
1590                             ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1591
1592         offset+=12;
1593
1594         while (number_prefixes > 0) {
1595
1596             /* prefix length */
1597             prefix_length=tvb_get_guint8(tvb, offset);
1598             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length);
1599
1600             /* prefix options */
1601             dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree);
1602
1603             /* 16 bits metric */
1604             metric=tvb_get_ntohs(tvb, offset+2);
1605             proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,
1606                                 "Metric: %u", metric);
1607
1608             offset+=4;
1609
1610             /* address_prefix */
1611             dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1612
1613             offset+=(prefix_length+31)/32*4;
1614
1615             number_prefixes--;
1616         }
1617         break;
1618
1619     default:
1620         /* unknown LSA type */
1621         proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1622                             "Unknown LSA Type 0x%04x",ls_type);
1623         offset += ls_length;
1624         break;
1625     }
1626     /* return the offset of the next LSA */
1627     return offset;
1628 }
1629
1630
1631 static void
1632 dissect_ospf_options(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
1633 {
1634     guint8 options_ospfv2;
1635     guint32 options_ospfv3;
1636     char options_string[20] = "";
1637
1638     /* ATTENTION !!! no check for length of options string  - with OSPFv3 maximum length is 14 characters */
1639
1640     switch ( version ) {
1641
1642         case OSPF_VERSION_2:
1643
1644             options_ospfv2 = tvb_get_guint8(tvb, offset);
1645
1646             if (options_ospfv2 & OSPF_V2_OPTIONS_E)
1647                 strcat(options_string, "E");
1648
1649             if (options_ospfv2 & OSPF_V2_OPTIONS_MC) {
1650                 if (options_string[0] != '\0')
1651                     strcat(options_string, "/");
1652                 strcat(options_string, "MC");
1653             }
1654
1655             if (options_ospfv2 & OSPF_V2_OPTIONS_NP) {
1656                 if (options_string[0] != '\0')
1657                     strcat(options_string, "/");
1658                 strcat(options_string, "NP");
1659             }
1660
1661             if (options_ospfv2 & OSPF_V2_OPTIONS_EA) {
1662                 if (options_string[0] != '\0')
1663                     strcat(options_string, "/");
1664                 strcat(options_string, "EA");
1665             }
1666
1667             if (options_ospfv2 & OSPF_V2_OPTIONS_DC) {
1668                 if (options_string[0] != '\0')
1669                     strcat(options_string, "/");
1670                 strcat(options_string, "DC");
1671             }
1672
1673             if (options_ospfv2 & OSPF_V2_OPTIONS_O) {
1674                 if (options_string[0] != '\0')
1675                     strcat(options_string, "/");
1676                 strcat(options_string, "O");
1677             }
1678
1679             if (options_ospfv2 & OSPF_V2_OPTIONS_DN) {
1680                 if (options_string[0] != '\0')
1681                     strcat(options_string, "/");
1682                 strcat(options_string, "DN");
1683             }
1684
1685             proto_tree_add_text(tree, tvb, offset, 1, "Options: 0x%x (%s)",
1686                         options_ospfv2, options_string);
1687             break;
1688
1689
1690         case OSPF_VERSION_3:
1691
1692             options_ospfv3 = tvb_get_ntoh24(tvb, offset);
1693
1694             if (options_ospfv3 & OSPF_V3_OPTIONS_V6)
1695                 strcat(options_string, "V6");
1696
1697             if (options_ospfv3 & OSPF_V3_OPTIONS_E)
1698                 if (options_string[0] != '\0')
1699                     strcat(options_string, "/");
1700                 strcat(options_string, "E");
1701
1702             if (options_ospfv3 & OSPF_V3_OPTIONS_MC) {
1703                 if (options_string[0] != '\0')
1704                     strcat(options_string, "/");
1705                 strcat(options_string, "MC");
1706             }
1707
1708             if (options_ospfv3 & OSPF_V3_OPTIONS_N) {
1709                 if (options_string[0] != '\0')
1710                     strcat(options_string, "/");
1711                 strcat(options_string, "N");
1712             }
1713
1714             if (options_ospfv3 & OSPF_V3_OPTIONS_R) {
1715                 if (options_string[0] != '\0')
1716                     strcat(options_string, "/");
1717                 strcat(options_string, "R");
1718             }
1719
1720             if (options_ospfv3 & OSPF_V3_OPTIONS_DC) {
1721                 if (options_string[0] != '\0')
1722                     strcat(options_string, "/");
1723                 strcat(options_string, "DC");
1724             }
1725
1726             proto_tree_add_text(tree, tvb, offset, 3, "Options: 0x%x (%s)",
1727                         options_ospfv3, options_string);
1728             break;
1729
1730         default:
1731             break;
1732     }
1733
1734 }
1735
1736
1737 static void dissect_ospf_v3_prefix_options(tvbuff_t *tvb, int offset, proto_tree *tree)
1738 {
1739
1740     guint8 prefix_options;
1741     char prefix_options_string[11];
1742     guint8 position;
1743
1744     position=0;
1745
1746     prefix_options=tvb_get_guint8(tvb, offset);
1747
1748     strcpy(prefix_options_string,"");
1749
1750     if (prefix_options & OSPF_V3_PREFIX_OPTION_P) {
1751         strcat(prefix_options_string, "P");
1752         position++;
1753     }
1754
1755     if (prefix_options & OSPF_V3_PREFIX_OPTION_MC) {
1756         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1757             strcat(prefix_options_string, "/");
1758             position++;
1759         }
1760         strcat(prefix_options_string, "MC");
1761         position+=2;
1762     }
1763
1764     if (prefix_options & OSPF_V3_PREFIX_OPTION_LA) {
1765         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1766             strcat(prefix_options_string, "/");
1767             position++;
1768         }
1769         strcat(prefix_options_string, "LA");
1770         position+=2;
1771     }
1772
1773     if (prefix_options & OSPF_V3_PREFIX_OPTION_NU) {
1774         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1775             strcat(prefix_options_string, "/");
1776             position++;
1777         }
1778         strcat(prefix_options_string, "NU");
1779     }
1780
1781     prefix_options_string[10]=0;
1782
1783     proto_tree_add_text(tree, tvb, offset, 1, "PrefixOptions: 0x%02x (%s)",prefix_options, prefix_options_string);
1784
1785 }
1786
1787
1788 static void dissect_ospf_v3_address_prefix(tvbuff_t *tvb, int offset, int prefix_length, proto_tree *tree)
1789 {
1790
1791     guint8 value;
1792     guint8 position;
1793     guint8 bufpos;
1794     gchar  buffer[32+7];
1795     gchar  bytebuf[3];
1796     guint8 bytes_to_process;
1797     int start_offset;
1798
1799     start_offset=offset;
1800     position=0;
1801     bufpos=0;
1802     bytes_to_process=((prefix_length+31)/32)*4;
1803
1804     while (bytes_to_process > 0 ) {
1805
1806         value=tvb_get_guint8(tvb, offset);
1807
1808         if ( (position > 0) && ( (position%2) == 0 ) )
1809             buffer[bufpos++]=':';
1810
1811         sprintf(bytebuf,"%02x",value);
1812         buffer[bufpos++]=bytebuf[0];
1813         buffer[bufpos++]=bytebuf[1];
1814
1815         position++;
1816         offset++;
1817         bytes_to_process--;
1818     }
1819
1820     buffer[bufpos]=0;
1821     proto_tree_add_text(tree, tvb, start_offset, ((prefix_length+31)/32)*4, "Address Prefix: %s",buffer);
1822
1823 }
1824
1825
1826 void
1827 proto_register_ospf(void)
1828 {
1829 /*        static hf_register_info hf[] = {
1830                 { &variable,
1831                 { "Name",           "ospf.abbreviation", TYPE, VALS_POINTER }},
1832         };*/
1833     static gint *ett[] = {
1834         &ett_ospf,
1835         &ett_ospf_hdr,
1836         &ett_ospf_hello,
1837         &ett_ospf_desc,
1838         &ett_ospf_lsr,
1839         &ett_ospf_lsa,
1840         &ett_ospf_lsa_upd,
1841         &ett_ospf_lsa_mpls,
1842         &ett_ospf_lsa_mpls_router,
1843         &ett_ospf_lsa_mpls_link,
1844         &ett_ospf_lsa_mpls_link_stlv
1845     };
1846
1847     proto_ospf = proto_register_protocol("Open Shortest Path First",
1848                                          "OSPF", "ospf");
1849  /*       proto_register_field_array(proto_ospf, hf, array_length(hf));*/
1850     proto_register_subtree_array(ett, array_length(ett));
1851 }
1852
1853 void
1854 proto_reg_handoff_ospf(void)
1855 {
1856     dissector_handle_t ospf_handle;
1857
1858     ospf_handle = create_dissector_handle(dissect_ospf, proto_ospf);
1859     dissector_add("ip.proto", IP_PROTO_OSPF, ospf_handle);
1860     data_handle = find_dissector("data");
1861 }