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 1.61 2002/04/25 06:34:41 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 <epan/packet.h>
  52 #include "ipproto.h"
  53 #include "in_cksum.h"
  54 #include "packet-rsvp.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, -1, "OSPF Hello Packet");
 469     ospf_hello_tree = proto_item_add_subtree(ti, ett_ospf_hello);
 470
 471     switch (version ) {
 472         case OSPF_VERSION_2:
 473             proto_tree_add_text(ospf_hello_tree, tvb, offset, 4, "Network Mask: %s",
 474                         ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 475             proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 2,
 476                         "Hello Interval: %u seconds",
 477                         tvb_get_ntohs(tvb, offset + 4));
 478
 479             dissect_ospf_options(tvb, offset + 6, ospf_hello_tree, version);
 480             proto_tree_add_text(ospf_hello_tree, tvb, offset + 7, 1, "Router Priority: %u",
 481                         tvb_get_guint8(tvb, offset + 7));
 482             proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 4, "Router Dead Interval: %u seconds",
 483                         tvb_get_ntohl(tvb, offset + 8));
 484             proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s",
 485                         ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
 486             proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s",
 487                         ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
 488
 489             offset += 20;
 490             while (tvb_reported_length_remaining(tvb, offset) != 0) {
 491                 proto_tree_add_text(ospf_hello_tree, tvb, offset, 4,
 492                             "Active Neighbor: %s",
 493                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 494                 offset += 4;
 495             }
 496             break;
 497         case OSPF_VERSION_3:
 498             proto_tree_add_text(ospf_hello_tree, tvb, offset + 0, 4, "Interface ID: %u",
 499                         tvb_get_ntohl(tvb, offset + 0));
 500             proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 1, "Router Priority: %u",
 501                         tvb_get_guint8(tvb, offset + 4));
 502             dissect_ospf_options(tvb, offset + 5, ospf_hello_tree, version);
 503             proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 2,
 504                         "Hello Interval: %u seconds",
 505                         tvb_get_ntohs(tvb, offset + 8));
 506             proto_tree_add_text(ospf_hello_tree, tvb, offset + 10, 2, "Router Dead Interval: %u seconds",
 507                         tvb_get_ntohs(tvb, offset + 10));
 508             proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s",
 509                         ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
 510             proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s",
 511                         ip_to_str(tvb_get_ptr(tvb, offset + 16, 4)));
 512             offset += 20;
 513             while (tvb_reported_length_remaining(tvb, offset) != 0) {
 514                 proto_tree_add_text(ospf_hello_tree, tvb, offset, 4,
 515                             "Active Neighbor: %s",
 516                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
 517                 offset += 4;
 518             }
 519
 520             break;
 521
 522         default:
 523             break;
 524     }
 525 }
 526
 527 static void
 528 dissect_ospf_db_desc(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 529 {
 530     proto_tree *ospf_db_desc_tree=NULL;
 531     proto_item *ti;
 532     guint8 flags;
 533     guint8 reserved;
 534     char flags_string[20] = "";
 535
 536     if (tree) {
 537         ti = proto_tree_add_text(tree, tvb, offset, -1, "OSPF DB Description");
 538         ospf_db_desc_tree = proto_item_add_subtree(ti, ett_ospf_desc);
 539
 540         switch (version ) {
 541
 542             case OSPF_VERSION_2:
 543
 544                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 2, "Interface MTU: %u",
 545                             tvb_get_ntohs(tvb, offset));
 546
 547                 dissect_ospf_options(tvb, offset + 2, ospf_db_desc_tree, version);
 548
 549                 flags = tvb_get_guint8(tvb, offset + 3);
 550                 if (flags & OSPF_DBD_FLAG_MS)
 551                     strcat(flags_string, "MS");
 552                 if (flags & OSPF_DBD_FLAG_M) {
 553                     if (flags_string[0] != '\0')
 554                         strcat(flags_string, "/");
 555                     strcat(flags_string, "M");
 556                 }
 557                 if (flags & OSPF_DBD_FLAG_I) {
 558                     if (flags_string[0] != '\0')
 559                         strcat(flags_string, "/");
 560                     strcat(flags_string, "I");
 561                 }
 562                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 3, 1, "Flags: 0x%x (%s)",
 563                             flags, flags_string);
 564                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 4, "DD Sequence: %u",
 565                             tvb_get_ntohl(tvb, offset + 4));
 566
 567                 offset += 8;
 568                 break;
 569
 570             case OSPF_VERSION_3:
 571
 572                 reserved = tvb_get_guint8(tvb, offset);
 573                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 574                                 reserved);
 575
 576                 dissect_ospf_options(tvb, offset + 1, ospf_db_desc_tree, version);
 577
 578                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 2, "Interface MTU: %u",
 579                             tvb_get_ntohs(tvb, offset+4));
 580
 581                 reserved = tvb_get_guint8(tvb, offset + 6);
 582                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 6, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 583                                 reserved);
 584
 585                 flags = tvb_get_guint8(tvb, offset + 7);
 586                 if (flags & OSPF_DBD_FLAG_MS)
 587                     strcat(flags_string, "MS");
 588                 if (flags & OSPF_DBD_FLAG_M) {
 589                     if (flags_string[0] != '\0')
 590                         strcat(flags_string, "/");
 591                     strcat(flags_string, "M");
 592                 }
 593                 if (flags & OSPF_DBD_FLAG_I) {
 594                     if (flags_string[0] != '\0')
 595                         strcat(flags_string, "/");
 596                     strcat(flags_string, "I");
 597                 }
 598                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 7, 1, "Flags: 0x%x (%s)",
 599                             flags, flags_string);
 600
 601                 proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 8, 4, "DD Sequence: %u",
 602                             tvb_get_ntohl(tvb, offset + 8));
 603
 604                 offset += 12;
 605                 break;
 606
 607             default:
 608                 break;
 609         }
 610     }
 611
 612     /* LS Headers will be processed here */
 613     /* skip to the end of DB-Desc header */
 614     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 615       if ( version == OSPF_VERSION_2)
 616           offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE);
 617       else
 618           if ( version == OSPF_VERSION_3)
 619               offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE);
 620     }
 621
 622 }
 623
 624 static void
 625 dissect_ospf_ls_req(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 626 {
 627     proto_tree *ospf_lsr_tree;
 628     proto_item *ti;
 629     guint32 ls_type;
 630     guint8 reserved;
 631
 632     /* zero or more LS requests may be within a LS Request */
 633     /* we place every request for a LSA in a single subtree */
 634     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 635         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LS_REQ_LENGTH,
 636                                  "Link State Request");
 637         ospf_lsr_tree = proto_item_add_subtree(ti, ett_ospf_lsr);
 638
 639         reserved = tvb_get_guint8(tvb, offset);
 640         proto_tree_add_text(ospf_lsr_tree, tvb, offset, 1,
 641            (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),
 642                                 reserved);
 643
 644         switch ( version ) {
 645
 646             case OSPF_VERSION_2:
 647                 ls_type = tvb_get_ntohl(tvb, offset);
 648                 proto_tree_add_text(ospf_lsr_tree, tvb, offset, 4, "LS Type: %s (%u)",
 649                             val_to_str(ls_type, ls_type_vals, "Unknown"),
 650                             ls_type);
 651                 break;
 652             case OSPF_VERSION_3:
 653                 ls_type = tvb_get_ntohs(tvb, offset+2);
 654                 proto_tree_add_text(ospf_lsr_tree, tvb, offset+2, 2, "LS Type: %s (0x%04x)",
 655                             val_to_str(ls_type, v3_ls_type_vals, "Unknown"),
 656                             ls_type);
 657                   break;
 658             default:
 659                  ls_type=0;
 660                  break;
 661         }
 662
 663
 664         proto_tree_add_text(ospf_lsr_tree, tvb, offset + 4, 4, "Link State ID: %s",
 665                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
 666         proto_tree_add_text(ospf_lsr_tree, tvb, offset + 8, 4, "Advertising Router: %s",
 667                             ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
 668
 669         offset += 12;
 670     }
 671 }
 672
 673 static void
 674 dissect_ospf_ls_upd(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 675 {
 676     proto_tree *ospf_lsa_upd_tree=NULL;
 677     proto_item *ti;
 678     guint32 lsa_nr;
 679     guint32 lsa_counter;
 680
 681     ti = proto_tree_add_text(tree, tvb, offset, -1, "LS Update Packet");
 682     ospf_lsa_upd_tree = proto_item_add_subtree(ti, ett_ospf_lsa_upd);
 683
 684     lsa_nr = tvb_get_ntohl(tvb, offset);
 685     proto_tree_add_text(ospf_lsa_upd_tree, tvb, offset, 4, "Number of LSAs: %u",
 686                         lsa_nr);
 687     /* skip to the beginning of the first LSA */
 688     offset += 4; /* the LS Upd Packet contains only a 32 bit #LSAs field */
 689
 690     lsa_counter = 0;
 691     while (lsa_counter < lsa_nr) {
 692         if ( version == OSPF_VERSION_2)
 693             offset = dissect_ospf_v2_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE);
 694         else
 695             if ( version == OSPF_VERSION_3)
 696                 offset = dissect_ospf_v3_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE);
 697         lsa_counter += 1;
 698     }
 699 }
 700
 701 static void
 702 dissect_ospf_ls_ack(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
 703 {
 704     /* the body of a LS Ack packet simply contains zero or more LSA Headers */
 705     while (tvb_reported_length_remaining(tvb, offset) != 0) {
 706         if ( version == OSPF_VERSION_2)
 707             offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE);
 708         else
 709             if ( version == OSPF_VERSION_3)
 710               offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE);
 711     }
 712 }
 713
 714 /*
 715  * Returns if an LSA is opaque, i.e. requires special treatment
 716  */
 717 static int
 718 is_opaque(int lsa_type)
 719 {
 720     return (lsa_type >= OSPF_LSTYPE_OP_LINKLOCAL &&
 721         lsa_type <= OSPF_LSTYPE_OP_ASWIDE);
 722 }
 723
 724 /* MPLS/TE TLV types */
 725 #define MPLS_TLV_ROUTER    1
 726 #define MPLS_TLV_LINK      2
 727
 728 /* MPLS/TE Link STLV types */
 729 enum {
 730     MPLS_LINK_TYPE       = 1,
 731     MPLS_LINK_ID,
 732     MPLS_LINK_LOCAL_IF,
 733     MPLS_LINK_REMOTE_IF,
 734     MPLS_LINK_TE_METRIC,
 735     MPLS_LINK_MAX_BW,
 736     MPLS_LINK_MAX_RES_BW,
 737     MPLS_LINK_UNRES_BW,
 738     MPLS_LINK_COLOR,
 739     MPLS_LINK_LOCAL_ID = 11,
 740     MPLS_LINK_REMOTE_ID,
 741     MPLS_LINK_PROTECTION = 14,
 742     MPLS_LINK_IF_SWITCHING_DESC,
 743     MPLS_LINK_SHARED_RISK_GROUP,
 744 };
 745
 746 static const value_string mpls_link_stlv_str[] = {
 747     {MPLS_LINK_TYPE, "Link Type"},
 748     {MPLS_LINK_ID, "Link ID"},
 749     {MPLS_LINK_LOCAL_IF, "Local Interface IP Address"},
 750     {MPLS_LINK_REMOTE_IF, "Remote Interface IP Address"},
 751     {MPLS_LINK_TE_METRIC, "Traffic Engineering Metric"},
 752     {MPLS_LINK_MAX_BW, "Maximum Bandwidth"},
 753     {MPLS_LINK_MAX_RES_BW, "Maximum Reservable Bandwidth"},
 754     {MPLS_LINK_UNRES_BW, "Unreserved Bandwidth"},
 755     {MPLS_LINK_COLOR, "Resource Class/Color"},
 756     {MPLS_LINK_LOCAL_ID, "Link Local Identifier"},
 757     {MPLS_LINK_REMOTE_ID, "Link Remote Identifier"},
 758     {MPLS_LINK_PROTECTION, "Link Protection Type"},
 759     {MPLS_LINK_IF_SWITCHING_DESC, "Interface Switching Capability Descriptor"},
 760     {MPLS_LINK_SHARED_RISK_GROUP, "Shared Risk Link Group"},
 761     {0, NULL},
 762 };
 763
 764 /*
 765  * Dissect MPLS/TE opaque LSA
 766  */
 767 static void
 768 dissect_ospf_lsa_mpls(tvbuff_t *tvb, int offset, proto_tree *tree,
 769                       guint32 length)
 770 {
 771     proto_item *ti;
 772     proto_tree *mpls_tree;
 773     proto_tree *tlv_tree;
 774     proto_tree *stlv_tree;
 775
 776     int tlv_type;
 777     int tlv_length;
 778     int tlv_end_offset;
 779
 780     int stlv_type, stlv_len, stlv_offset;
 781     char *stlv_name;
 782     int i;
 783
 784     ti = proto_tree_add_text(tree, tvb, offset, length,
 785                              "MPLS Traffic Engineering LSA");
 786     mpls_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls);
 787
 788     while (length != 0) {
 789         tlv_type = tvb_get_ntohs(tvb, offset);
 790         tlv_length = tvb_get_ntohs(tvb, offset + 2);
 791         tlv_end_offset = offset + tlv_length + 4;
 792
 793         switch (tlv_type) {
 794
 795         case MPLS_TLV_ROUTER:
 796             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 797                                      "Router Address: %s",
 798                                      ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
 799             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_router);
 800             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 1 - Router Address");
 801             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 802                                 tlv_length);
 803             proto_tree_add_text(tlv_tree, tvb, offset+4, 4, "Router Address: %s",
 804                                 ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
 805             break;
 806
 807         case MPLS_TLV_LINK:
 808             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 809                                      "Link Information");
 810             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link);
 811             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 2 - Link Information");
 812             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 813                                 tlv_length);
 814             stlv_offset = offset + 4;
 815
 816             /* Walk down the sub-TLVs for link information */
 817             while (stlv_offset < tlv_end_offset) {
 818                 stlv_type = tvb_get_ntohs(tvb, stlv_offset);
 819                 stlv_len = tvb_get_ntohs(tvb, stlv_offset + 2);
 820                 stlv_name = val_to_str(stlv_type, mpls_link_stlv_str, "Unknown sub-TLV");
 821                 switch (stlv_type) {
 822
 823                 case MPLS_LINK_TYPE:
 824                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 825                                              "%s: %u", stlv_name,
 826                                              tvb_get_guint8(tvb, stlv_offset + 4));
 827                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 828                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 829                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 830                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 831                                         stlv_len);
 832                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 1, "%s: %u", stlv_name,
 833                                         tvb_get_guint8(tvb, stlv_offset + 4));
 834                     break;
 835
 836                 case MPLS_LINK_ID:
 837                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 838                                              "%s: %s (%x)", stlv_name,
 839                                              ip_to_str(tvb_get_ptr(tvb, stlv_offset + 4, 4)),
 840                                              tvb_get_ntohl(tvb, stlv_offset + 4));
 841                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 842                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 843                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 844                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 845                                         stlv_len);
 846                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %s (%x)", stlv_name,
 847                                         ip_to_str(tvb_get_ptr(tvb, stlv_offset + 4, 4)),
 848                                         tvb_get_ntohl(tvb, stlv_offset + 4));
 849                     break;
 850
 851                 case MPLS_LINK_LOCAL_IF:
 852                 case MPLS_LINK_REMOTE_IF:
 853                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 854                                              "%s", stlv_name);
 855                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 856                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 857                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 858                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 859                                         stlv_len);
 860                     /*   The Local/Remote Interface IP Address sub-TLV is TLV type 3/4, and is 4N
 861                        octets in length, where N is the number of neighbor addresses. */
 862                     for (i=0; i < stlv_len; i+=4)
 863                       proto_tree_add_text(stlv_tree, tvb, stlv_offset+4+i, 4, "%s: %s", stlv_name,
 864                                           ip_to_str(tvb_get_ptr(tvb, stlv_offset+4+i, 4)));
 865                     break;
 866
 867                 case MPLS_LINK_TE_METRIC:
 868                 case MPLS_LINK_COLOR:
 869                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 870                                              "%s: %u", stlv_name,
 871                                              tvb_get_ntohl(tvb, stlv_offset + 4));
 872                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 873                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 874                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 875                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 876                                         stlv_len);
 877                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %u", stlv_name,
 878                                         tvb_get_ntohl(tvb, stlv_offset + 4));
 879                     break;
 880
 881                 case MPLS_LINK_MAX_BW:
 882                 case MPLS_LINK_MAX_RES_BW:
 883                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 884                                              "%s: %.10g", stlv_name,
 885                                              tvb_get_ntohieee_float(tvb, stlv_offset + 4));
 886                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 887                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 888                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 889                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 890                                         stlv_len);
 891                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %.10g", stlv_name,
 892                                         tvb_get_ntohieee_float(tvb, stlv_offset + 4));
 893                     break;
 894
 895                 case MPLS_LINK_UNRES_BW:
 896                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 897                                              "%s", stlv_name);
 898                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 899                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 900                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 901                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 902                                         stlv_len);
 903                     for (i = 0; i < 8; i++) {
 904                         proto_tree_add_text(stlv_tree, tvb, stlv_offset+4+(i*4), 4,
 905                                             "Pri %d: %.10g bytes/s (%.0f bits/s)", i,
 906                                             tvb_get_ntohieee_float(tvb, stlv_offset + 4 + i*4),
 907                                             tvb_get_ntohieee_float(tvb, stlv_offset + 4 + i*4) * 8.0);
 908                     }
 909                     break;
 910
 911                 case MPLS_LINK_LOCAL_ID:
 912                 case MPLS_LINK_REMOTE_ID:
 913                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 914                                              "%s: %d (0x%x)", stlv_name,
 915                                              tvb_get_ntohl(tvb, stlv_offset + 4),
 916                                              tvb_get_ntohl(tvb, stlv_offset + 4));
 917                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 918                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 919                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 920                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 921                                         stlv_len);
 922                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %d (0x%x)", stlv_name,
 923                                         tvb_get_ntohl(tvb, stlv_offset + 4),
 924                                         tvb_get_ntohl(tvb, stlv_offset + 4));
 925                     break;
 926
 927                 case MPLS_LINK_IF_SWITCHING_DESC:
 928                     ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 929                                              "%s", stlv_name);
 930                     stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv);
 931                     proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2,
 932                                         "TLV Type: %u: %s", stlv_type, stlv_name);
 933                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u",
 934                                         stlv_len);
 935                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 1, "Switching Type: %s",
 936                                         val_to_str(tvb_get_guint8(tvb,stlv_offset+4),
 937                                                    gmpls_switching_type_str, "Unknown (%d)"));
 938                     proto_tree_add_text(stlv_tree, tvb, stlv_offset+5, 1, "Encoding: %s",
 939                                         val_to_str(tvb_get_guint8(tvb,stlv_offset+5),
 940                                                    gmpls_lsp_enc_str, "Unknown (%d)"));
 941                     for (i = 0; i < 8; i++) {
 942                         proto_tree_add_text(stlv_tree, tvb, stlv_offset+8+(i*4), 4,
 943                                             "Pri %d: %.10g bytes/s (%.0f bits/s)", i,
 944                                             tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4),
 945                                             tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4) * 8.0);
 946                     }
 947                     break;
 948
 949                 default:
 950                     proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4,
 951                                         "Unknown Link sub-TLV: %u", stlv_type);
 952                     break;
 953                 }
 954                 stlv_offset += ((stlv_len+4+3)/4)*4;
 955             }
 956             break;
 957
 958         default:
 959             ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4,
 960                                      "Unknown LSA: %u", tlv_type);
 961             tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link);
 962             proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: %u - Unknown",
 963                                 tlv_type);
 964             proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u",
 965                                 tlv_length);
 966             proto_tree_add_text(tlv_tree, tvb, offset+4, tlv_length, "TLV Data");
 967             break;
 968         }
 969
 970         offset += tlv_length + 4;
 971         length -= tlv_length + 4;
 972     }
 973 }
 974
 975 /*
 976  * Dissect opaque LSAs
 977  */
 978 static void
 979 dissect_ospf_lsa_opaque(tvbuff_t *tvb, int offset, proto_tree *tree,
 980                         guint8 ls_id_type, guint32 length)
 981 {
 982     switch (ls_id_type) {
 983
 984     case OSPF_LSA_MPLS_TE:
 985         dissect_ospf_lsa_mpls(tvb, offset, tree, length);
 986         break;
 987
 988     default:
 989         proto_tree_add_text(tree, tvb, offset, length,
 990                             "Unknown LSA Type %u", ls_id_type);
 991         break;
 992     } /* switch on opaque LSA id */
 993 }
 994
 995 static int
 996 dissect_ospf_v2_lsa(tvbuff_t *tvb, int offset, proto_tree *tree,
 997                  gboolean disassemble_body)
 998 {
 999     proto_tree *ospf_lsa_tree;
1000     proto_item *ti;
1001
1002     guint8               ls_type;
1003     guint16              ls_length;
1004     int                  end_offset;
1005     guint8               nr_links;
1006     guint16              nr_tos;
1007
1008     /* router LSA */
1009     guint8               link_type;
1010     guint16              link_counter;
1011     guint8               tos_counter;
1012     char                *link_type_str;
1013     char                *link_id;
1014
1015     /* AS-external LSA */
1016     guint8               options;
1017
1018     /* opaque LSA */
1019     guint8               ls_id_type;
1020
1021     ls_type = tvb_get_guint8(tvb, offset + 3);
1022     ls_length = tvb_get_ntohs(tvb, offset + 18);
1023     end_offset = offset + ls_length;
1024
1025     if (disassemble_body) {
1026         ti = proto_tree_add_text(tree, tvb, offset, ls_length,
1027                                  "%s (Type: %u)", val_to_str(ls_type, ls_type_vals,"Unkown"), ls_type);
1028     } else {
1029         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH,
1030                                  "LSA Header");
1031     }
1032     ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa);
1033
1034     proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds",
1035                         tvb_get_ntohs(tvb, offset));
1036     dissect_ospf_options(tvb, offset + 2, ospf_lsa_tree, OSPF_VERSION_2);
1037     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 3, 1, "LSA Type: %u (%s)",
1038                         ls_type, val_to_str(ls_type,ls_type_vals,"Unknown"));
1039
1040     if (is_opaque(ls_type)) {
1041         ls_id_type = tvb_get_guint8(tvb, offset + 4);
1042         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 1, "Link State ID Opaque Type: %u",
1043                             ls_id_type);
1044         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 5, 3, "Link State ID Opaque ID: %u",
1045                             tvb_get_ntoh24(tvb, offset + 5));
1046     } else {
1047         ls_id_type = 0;
1048         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s",
1049                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1050     }
1051
1052     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Advertising Router: %s",
1053                         ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1054     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: 0x%04x",
1055                         tvb_get_ntohl(tvb, offset + 12));
1056     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x",
1057                         tvb_get_ntohs(tvb, offset + 16));
1058
1059     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u",
1060                         ls_length);
1061
1062     /* skip past the LSA header to the body */
1063     offset += OSPF_LSA_HEADER_LENGTH;
1064     ls_length -= OSPF_LSA_HEADER_LENGTH;
1065
1066     if (!disassemble_body)
1067         return offset;
1068
1069     switch (ls_type){
1070
1071     case OSPF_LSTYPE_ROUTER:
1072         /* again: flags should be secified in detail */
1073         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x",
1074                             tvb_get_guint8(tvb, offset));
1075         nr_links = tvb_get_ntohs(tvb, offset + 2);
1076         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "Number of Links: %u",
1077                             nr_links);
1078         offset += 4;
1079         /* nr_links links follow
1080          * maybe we should put each of the links into its own subtree ???
1081          */
1082         for (link_counter = 1; link_counter <= nr_links; link_counter++) {
1083             /* check the Link Type and ID */
1084             link_type = tvb_get_guint8(tvb, offset + 8);
1085             switch (link_type) {
1086
1087             case OSPF_LINK_PTP:
1088                 link_type_str="Point-to-point connection to another router";
1089                 link_id="Neighboring router's Router ID";
1090                 break;
1091
1092             case OSPF_LINK_TRANSIT:
1093                 link_type_str="Connection to a transit network";
1094                 link_id="IP address of Designated Router";
1095                 break;
1096
1097             case OSPF_LINK_STUB:
1098                 link_type_str="Connection to a stub network";
1099                 link_id="IP network/subnet number";
1100                 break;
1101
1102             case OSPF_LINK_VIRTUAL:
1103                 link_type_str="Virtual link";
1104                 link_id="Neighboring router's Router ID";
1105                 break;
1106
1107             default:
1108                 link_type_str="Unknown link type";
1109                 link_id="Unknown link ID";
1110                 break;
1111             }
1112
1113             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "%s: %s", link_id,
1114                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1115
1116             /* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
1117             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link Data: %s",
1118                                 ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1119
1120             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 1, "Link Type: %u - %s",
1121                                 link_type, link_type_str);
1122             nr_tos = tvb_get_guint8(tvb, offset + 9);
1123             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 9, 1, "Number of TOS metrics: %u",
1124                                 nr_tos);
1125             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 10, 2, "TOS 0 metric: %u",
1126                                 tvb_get_ntohs(tvb, offset + 10));
1127
1128             offset += 12;
1129
1130             /* nr_tos metrics may follow each link
1131              * ATTENTION: TOS metrics are not tested (I don't have TOS
1132              * based routing)
1133              * please send me a mail if it is/isn't working
1134              */
1135             for (tos_counter = 1; tos_counter <= nr_tos; tos_counter++) {
1136                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1137                                     tvb_get_guint8(tvb, offset),
1138                                     tvb_get_ntohs(tvb, offset + 2));
1139                 offset += 4;
1140             }
1141         }
1142         break;
1143
1144     case OSPF_LSTYPE_NETWORK:
1145         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1146                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1147         offset += 4;
1148
1149         while (offset < end_offset) {
1150             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s",
1151                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1152             offset += 4;
1153         }
1154         break;
1155
1156     case OSPF_LSTYPE_SUMMERY:
1157     /* Type 3 and 4 LSAs have the same format */
1158     case OSPF_LSTYPE_ASBR:
1159         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1160                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1161         offset += 4;
1162
1163         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Metric: %u",
1164                             tvb_get_ntoh24(tvb, offset + 1));
1165         offset += 4;
1166
1167         /* TOS-specific information, if any */
1168         while (offset < end_offset) {
1169             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1170                                 tvb_get_guint8(tvb, offset),
1171                                 tvb_get_ntoh24(tvb, offset + 1));
1172             offset += 4;
1173         }
1174         break;
1175
1176     case OSPF_LSTYPE_ASEXT:
1177     case OSPF_LSTYPE_ASEXT7:
1178         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s",
1179                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1180         offset += 4;
1181
1182         options = tvb_get_guint8(tvb, offset);
1183         if (options & 0x80) { /* check wether or not E bit is set */
1184             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1185                     "External Type: Type 2 (metric is larger than any other link state path)");
1186         } else {
1187             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1188                     "External Type: Type 1 (metric is specified in the same units as interface cost)");
1189         }
1190         /* the metric field of a AS-external LAS is specified in 3 bytes */
1191         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3, "Metric: %u",
1192                             tvb_get_ntoh24(tvb, offset + 1));
1193         offset += 4;
1194
1195         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s",
1196                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1197         offset += 4;
1198
1199         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u",
1200                             tvb_get_ntohl(tvb, offset));
1201         offset += 4;
1202
1203         /* TOS-specific information, if any */
1204         while (offset < end_offset) {
1205             options = tvb_get_guint8(tvb, offset);
1206             if (options & 0x80) { /* check wether or not E bit is set */
1207                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1208                         "External Type: Type 2 (metric is larger than any other link state path)");
1209             } else {
1210                 proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1211                         "External Type: Type 1 (metric is specified in the same units as interface cost)");
1212             }
1213             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u",
1214                                 options & 0x7F,
1215                                 tvb_get_ntoh24(tvb, offset + 1));
1216             offset += 4;
1217
1218             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s",
1219                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1220             offset += 4;
1221
1222             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u",
1223                                 tvb_get_ntohl(tvb, offset));
1224             offset += 4;
1225         }
1226         break;
1227
1228     case OSPF_LSTYPE_OP_LINKLOCAL:
1229     case OSPF_LSTYPE_OP_AREALOCAL:
1230     case OSPF_LSTYPE_OP_ASWIDE:
1231         dissect_ospf_lsa_opaque(tvb, offset, ospf_lsa_tree, ls_id_type,
1232                                 ls_length);
1233         offset += ls_length;
1234         break;
1235
1236     default:
1237         /* unknown LSA type */
1238         proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1239                             "Unknown LSA Type");
1240         offset += ls_length;
1241         break;
1242     }
1243     /* return the offset of the next LSA */
1244     return offset;
1245 }
1246
1247 static int
1248 dissect_ospf_v3_lsa(tvbuff_t *tvb, int offset, proto_tree *tree,
1249                  gboolean disassemble_body)
1250 {
1251     proto_tree *ospf_lsa_tree;
1252     proto_item *ti;
1253
1254     guint16              ls_type;
1255     guint16              ls_length;
1256     int                  end_offset;
1257     guint8               reserved;
1258
1259     /* router LSA */
1260     guint8               link_type;
1261     char                *link_type_str;
1262     guint32              metric;
1263
1264     guint8               router_lsa_flags;
1265     char                 router_lsa_flags_string[5];
1266
1267     guint8               router_priority;
1268     guint32              number_prefixes;
1269     guint8               prefix_length;
1270     guint16              reserved16;
1271
1272     guint16              referenced_ls_type;
1273
1274     guint8               flags;
1275     guint8               flags_string[4];
1276     guint32              external_route_tag;
1277
1278
1279     ls_type = tvb_get_ntohs(tvb, offset + 2);
1280     ls_length = tvb_get_ntohs(tvb, offset + 18);
1281     end_offset = offset + ls_length;
1282
1283     if (disassemble_body) {
1284         ti = proto_tree_add_text(tree, tvb, offset, ls_length,
1285                                  "%s (Type: 0x%04x)", val_to_str(ls_type, v3_ls_type_vals,"Unknown"), ls_type);
1286     } else {
1287         ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH,
1288                                  "LSA Header");
1289     }
1290     ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa);
1291
1292     proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds",
1293                         tvb_get_ntohs(tvb, offset));
1294
1295     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "LSA Type: 0x%04x (%s)",
1296                         ls_type, val_to_str(ls_type, v3_ls_type_vals,"Unkown"));
1297
1298     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s",
1299                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1300
1301     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Advertising Router: %s",
1302                         ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1303     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: %d",
1304                         tvb_get_ntohl(tvb, offset + 12));
1305     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x",
1306                         tvb_get_ntohs(tvb, offset + 16));
1307
1308     proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u",
1309                         ls_length);
1310
1311     /* skip past the LSA header to the body */
1312     offset += OSPF_LSA_HEADER_LENGTH;
1313     ls_length -= OSPF_LSA_HEADER_LENGTH;
1314
1315     if (!disassemble_body)
1316         return offset;
1317
1318     switch (ls_type){
1319
1320
1321     case OSPF_V3_LSTYPE_ROUTER:
1322
1323       /* flags field in an router-lsa */
1324         router_lsa_flags=tvb_get_guint8(tvb,offset);
1325         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_B)
1326             router_lsa_flags_string[3] = 'B';
1327         else
1328             router_lsa_flags_string[3] = '.';
1329         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_E)
1330             router_lsa_flags_string[2] = 'E';
1331         else
1332             router_lsa_flags_string[2] = '.';
1333         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_V)
1334             router_lsa_flags_string[1] = 'V';
1335         else
1336             router_lsa_flags_string[1] = '.';
1337         if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_W)
1338             router_lsa_flags_string[0] = 'W';
1339         else
1340             router_lsa_flags_string[0] = '.';
1341
1342         router_lsa_flags_string[4]=0;
1343
1344         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)",
1345                             router_lsa_flags, router_lsa_flags_string);
1346
1347         /* options field in an router-lsa */
1348         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1349
1350         /* skip the router-lsa flags and options */
1351         offset+=4;
1352         ls_length-=4;
1353
1354         if (ls_length > 0)
1355              proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1356                    "Router Interfaces:");
1357
1358         /* scan all router-lsa router interfaces */
1359         /* maybe we should put each of the links into its own subtree ??? */
1360         while (ls_length > 0 ) {
1361
1362             /* check the type */
1363             link_type = tvb_get_guint8(tvb, offset);
1364             switch (link_type) {
1365
1366                 case OSPF_V3_LINK_PTP:
1367                     link_type_str="Point-to-point connection to another router";
1368                     break;
1369
1370                 case OSPF_V3_LINK_TRANSIT:
1371                     link_type_str="Connection to a transit network";
1372                     break;
1373
1374                 case OSPF_V3_LINK_RESERVED:
1375                     link_type_str="Connection to a stub network";
1376                     break;
1377
1378                 case OSPF_V3_LINK_VIRTUAL:
1379                     link_type_str="Virtual link";
1380                     break;
1381
1382                 default:
1383                     link_type_str="Unknown link type";
1384                     break;
1385             }
1386
1387             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Type: %u (%s)", link_type,link_type_str);
1388
1389             /* reserved field */
1390             reserved = tvb_get_guint8(tvb, offset+1);
1391             proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 1,
1392                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1393
1394             /* metric */
1395             metric=tvb_get_ntohs(tvb, offset+2);
1396             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2,"Metric: %u",metric);
1397
1398             /* Interface ID */
1399             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Interface ID: %u",
1400                         tvb_get_ntohl(tvb, offset + 4));
1401
1402             /* Neighbor Interface ID */
1403             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Neighbor Interface ID: %u",
1404                         tvb_get_ntohl(tvb, offset + 8));
1405
1406             /* Neighbor Router ID */
1407             proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "Neighbor Router ID: %s",
1408                 ip_to_str(tvb_get_ptr(tvb, offset + 12, 4)));
1409
1410             /* skip to the (possible) next entry */
1411             offset+=16;
1412             ls_length-=16;
1413
1414         }
1415         break;
1416
1417     case OSPF_V3_LSTYPE_NETWORK:
1418
1419         /* reserved field */
1420         reserved = tvb_get_guint8(tvb, offset);
1421         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1422                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1423
1424         /* options field in an network-lsa */
1425         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1426
1427         offset += 4;
1428         ls_length-=4;
1429
1430         while (ls_length > 0 ) {
1431             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s",
1432                                 ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1433             ls_length-=4;
1434             offset += 4;
1435         }
1436         break;
1437
1438
1439     case OSPF_V3_LSTYPE_INTER_AREA_PREFIX:
1440
1441         /* reserved field */
1442         reserved = tvb_get_guint8(tvb, offset);
1443         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1444                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1445
1446         /* metric */
1447         metric=tvb_get_ntoh24(tvb, offset+11);
1448         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3,"Metric: %u",metric);
1449
1450         /* prefix length */
1451         prefix_length=tvb_get_guint8(tvb, offset+4);
1452         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length);
1453
1454         /* prefix options */
1455         dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree);
1456
1457         /* 16 bits reserved */
1458         reserved16=tvb_get_ntohs(tvb, offset+6);
1459         proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2,
1460                (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16);
1461
1462         offset+=8;
1463
1464         /* address_prefix */
1465         dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1466
1467         offset+=(prefix_length+31)/32*4;
1468
1469         break;
1470
1471
1472     case OSPF_V3_LSTYPE_INTER_AREA_ROUTER:
1473
1474         /* reserved field */
1475         reserved = tvb_get_guint8(tvb, offset);
1476         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1,
1477                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1478
1479         /* options field in an inter-area-router-lsa */
1480         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1481
1482         /* reserved field */
1483         reserved = tvb_get_guint8(tvb, offset+4);
1484         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1,
1485                (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved);
1486
1487         /* metric */
1488         metric=tvb_get_ntoh24(tvb, offset+6);
1489         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 6, 3,"Metric: %u",metric);
1490
1491         /* Destination Router ID */
1492         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Destination Router ID: %s",
1493                 ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1494
1495         offset+=12;
1496         break;
1497
1498
1499     case OSPF_V3_LSTYPE_AS_EXTERNAL:
1500
1501         /* flags */
1502         flags=tvb_get_guint8(tvb, offset);
1503         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_E)
1504             flags_string[0] = 'E';
1505         else
1506             flags_string[0] = '.';
1507         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_F)
1508             flags_string[1] = 'F';
1509         else
1510             flags_string[1] = '.';
1511         if (flags & OSPF_V3_AS_EXTERNAL_FLAG_T)
1512             flags_string[2] = 'T';
1513         else
1514             flags_string[2] = '.';
1515
1516         flags_string[3]=0;
1517
1518         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)",
1519                             flags, flags_string);
1520
1521         /* 24 bits metric */
1522         metric=tvb_get_ntoh24(tvb, offset+1);
1523         proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 3,
1524                                 "Metric: %u", metric);
1525
1526         /* prefix length */
1527         prefix_length=tvb_get_guint8(tvb, offset+4);
1528         proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length);
1529
1530         /* prefix options */
1531         dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree);
1532
1533         /* referenced LS type */
1534         referenced_ls_type=tvb_get_ntohs(tvb, offset+6);
1535         proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2,"Referenced LS type 0x%04x (%s)",
1536                             referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown"));
1537
1538         offset+=8;
1539
1540         /* address_prefix */
1541         dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1542
1543         offset+=(prefix_length+31)/32*4;
1544
1545         /* Forwarding Address (optional - only if F-flag is on) */
1546         if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_F) ) {
1547             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 16,"Forwarding Address: %s",
1548               ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset, 16)));
1549
1550             offset+=16;
1551         }
1552
1553         /* External Route Tag (optional - only if T-flag is on) */
1554         if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_T) ) {
1555             external_route_tag=tvb_get_ntohl(tvb, offset);
1556             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4,"External Route Tag: 0x%04x",
1557                                 external_route_tag);
1558
1559             offset+=4;
1560         }
1561
1562         /* Referenced Link State ID (optional - only if Referenced LS type is non-zero */
1563         if ( (offset < end_offset) && (referenced_ls_type != 0) ) {
1564             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Referenced Link State ID: %s",
1565                             ip_to_str(tvb_get_ptr(tvb, offset, 4)));
1566             offset+=4;
1567         }
1568
1569         break;
1570
1571     case OSPF_V3_LSTYPE_LINK:
1572
1573         /* router priority */
1574         router_priority=tvb_get_guint8(tvb, offset);
1575         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Router Priority: %u", router_priority);
1576
1577         /* options field in an link-lsa */
1578         dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3);
1579
1580         /* Link-local Interface Address */
1581         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 16, "Link-local Interface Address: %s",
1582            ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, 16)));
1583
1584         /* Number prefixes */
1585         number_prefixes=tvb_get_ntohl(tvb, offset + 20);
1586         proto_tree_add_text(ospf_lsa_tree, tvb, offset+20, 4, "# prefixes: %d",number_prefixes);
1587
1588         offset+=24;
1589
1590         while (number_prefixes > 0) {
1591
1592             /* prefix length */
1593             prefix_length=tvb_get_guint8(tvb, offset);
1594             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length);
1595
1596             /* prefix options */
1597             dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree);
1598
1599             /* 16 bits reserved */
1600             reserved16=tvb_get_ntohs(tvb, offset+2);
1601             proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,
1602                (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16);
1603
1604             offset+=4;
1605
1606             /* address_prefix */
1607             dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1608
1609             offset+=(prefix_length+31)/32*4;
1610
1611             number_prefixes--;
1612
1613         }
1614         break;
1615
1616     case OSPF_V3_LSTYPE_INTRA_AREA_PREFIX:
1617
1618         /* # prefixes */
1619         number_prefixes=tvb_get_ntohs(tvb, offset);
1620         proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2,"# prefixes: %u",number_prefixes);
1621
1622         /* referenced LS type */
1623         referenced_ls_type=tvb_get_ntohs(tvb, offset+2);
1624         proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,"Referenced LS type 0x%04x (%s)",
1625                             referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown"));
1626
1627         /* Referenced Link State ID */
1628         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Referenced Link State ID: %s",
1629                             ip_to_str(tvb_get_ptr(tvb, offset + 4, 4)));
1630
1631         /* Referenced Advertising Router */
1632         proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Referenced Advertising Router: %s",
1633                             ip_to_str(tvb_get_ptr(tvb, offset + 8, 4)));
1634
1635         offset+=12;
1636
1637         while (number_prefixes > 0) {
1638
1639             /* prefix length */
1640             prefix_length=tvb_get_guint8(tvb, offset);
1641             proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length);
1642
1643             /* prefix options */
1644             dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree);
1645
1646             /* 16 bits metric */
1647             metric=tvb_get_ntohs(tvb, offset+2);
1648             proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,
1649                                 "Metric: %u", metric);
1650
1651             offset+=4;
1652
1653             /* address_prefix */
1654             dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree);
1655
1656             offset+=(prefix_length+31)/32*4;
1657
1658             number_prefixes--;
1659         }
1660         break;
1661
1662     default:
1663         /* unknown LSA type */
1664         proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length,
1665                             "Unknown LSA Type 0x%04x",ls_type);
1666         offset += ls_length;
1667         break;
1668     }
1669     /* return the offset of the next LSA */
1670     return offset;
1671 }
1672
1673
1674 static void
1675 dissect_ospf_options(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version)
1676 {
1677     guint8 options_ospfv2;
1678     guint32 options_ospfv3;
1679     char options_string[20] = "";
1680
1681     /* ATTENTION !!! no check for length of options string  - with OSPFv3 maximum length is 14 characters */
1682
1683     switch ( version ) {
1684
1685         case OSPF_VERSION_2:
1686
1687             options_ospfv2 = tvb_get_guint8(tvb, offset);
1688
1689             if (options_ospfv2 & OSPF_V2_OPTIONS_E)
1690                 strcat(options_string, "E");
1691
1692             if (options_ospfv2 & OSPF_V2_OPTIONS_MC) {
1693                 if (options_string[0] != '\0')
1694                     strcat(options_string, "/");
1695                 strcat(options_string, "MC");
1696             }
1697
1698             if (options_ospfv2 & OSPF_V2_OPTIONS_NP) {
1699                 if (options_string[0] != '\0')
1700                     strcat(options_string, "/");
1701                 strcat(options_string, "NP");
1702             }
1703
1704             if (options_ospfv2 & OSPF_V2_OPTIONS_EA) {
1705                 if (options_string[0] != '\0')
1706                     strcat(options_string, "/");
1707                 strcat(options_string, "EA");
1708             }
1709
1710             if (options_ospfv2 & OSPF_V2_OPTIONS_DC) {
1711                 if (options_string[0] != '\0')
1712                     strcat(options_string, "/");
1713                 strcat(options_string, "DC");
1714             }
1715
1716             if (options_ospfv2 & OSPF_V2_OPTIONS_O) {
1717                 if (options_string[0] != '\0')
1718                     strcat(options_string, "/");
1719                 strcat(options_string, "O");
1720             }
1721
1722             if (options_ospfv2 & OSPF_V2_OPTIONS_DN) {
1723                 if (options_string[0] != '\0')
1724                     strcat(options_string, "/");
1725                 strcat(options_string, "DN");
1726             }
1727
1728             proto_tree_add_text(tree, tvb, offset, 1, "Options: 0x%x (%s)",
1729                         options_ospfv2, options_string);
1730             break;
1731
1732
1733         case OSPF_VERSION_3:
1734
1735             options_ospfv3 = tvb_get_ntoh24(tvb, offset);
1736
1737             if (options_ospfv3 & OSPF_V3_OPTIONS_V6)
1738                 strcat(options_string, "V6");
1739
1740             if (options_ospfv3 & OSPF_V3_OPTIONS_E)
1741                 if (options_string[0] != '\0')
1742                     strcat(options_string, "/");
1743                 strcat(options_string, "E");
1744
1745             if (options_ospfv3 & OSPF_V3_OPTIONS_MC) {
1746                 if (options_string[0] != '\0')
1747                     strcat(options_string, "/");
1748                 strcat(options_string, "MC");
1749             }
1750
1751             if (options_ospfv3 & OSPF_V3_OPTIONS_N) {
1752                 if (options_string[0] != '\0')
1753                     strcat(options_string, "/");
1754                 strcat(options_string, "N");
1755             }
1756
1757             if (options_ospfv3 & OSPF_V3_OPTIONS_R) {
1758                 if (options_string[0] != '\0')
1759                     strcat(options_string, "/");
1760                 strcat(options_string, "R");
1761             }
1762
1763             if (options_ospfv3 & OSPF_V3_OPTIONS_DC) {
1764                 if (options_string[0] != '\0')
1765                     strcat(options_string, "/");
1766                 strcat(options_string, "DC");
1767             }
1768
1769             proto_tree_add_text(tree, tvb, offset, 3, "Options: 0x%x (%s)",
1770                         options_ospfv3, options_string);
1771             break;
1772
1773         default:
1774             break;
1775     }
1776
1777 }
1778
1779
1780 static void dissect_ospf_v3_prefix_options(tvbuff_t *tvb, int offset, proto_tree *tree)
1781 {
1782
1783     guint8 prefix_options;
1784     char prefix_options_string[11];
1785     guint8 position;
1786
1787     position=0;
1788
1789     prefix_options=tvb_get_guint8(tvb, offset);
1790
1791     strcpy(prefix_options_string,"");
1792
1793     if (prefix_options & OSPF_V3_PREFIX_OPTION_P) {
1794         strcat(prefix_options_string, "P");
1795         position++;
1796     }
1797
1798     if (prefix_options & OSPF_V3_PREFIX_OPTION_MC) {
1799         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1800             strcat(prefix_options_string, "/");
1801             position++;
1802         }
1803         strcat(prefix_options_string, "MC");
1804         position+=2;
1805     }
1806
1807     if (prefix_options & OSPF_V3_PREFIX_OPTION_LA) {
1808         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1809             strcat(prefix_options_string, "/");
1810             position++;
1811         }
1812         strcat(prefix_options_string, "LA");
1813         position+=2;
1814     }
1815
1816     if (prefix_options & OSPF_V3_PREFIX_OPTION_NU) {
1817         if ( (position > 0) && (prefix_options_string[position-1] != '/') ) {
1818             strcat(prefix_options_string, "/");
1819             position++;
1820         }
1821         strcat(prefix_options_string, "NU");
1822     }
1823
1824     prefix_options_string[10]=0;
1825
1826     proto_tree_add_text(tree, tvb, offset, 1, "PrefixOptions: 0x%02x (%s)",prefix_options, prefix_options_string);
1827
1828 }
1829
1830
1831 static void dissect_ospf_v3_address_prefix(tvbuff_t *tvb, int offset, int prefix_length, proto_tree *tree)
1832 {
1833
1834     guint8 value;
1835     guint8 position;
1836     guint8 bufpos;
1837     gchar  buffer[32+7];
1838     gchar  bytebuf[3];
1839     guint8 bytes_to_process;
1840     int start_offset;
1841
1842     start_offset=offset;
1843     position=0;
1844     bufpos=0;
1845     bytes_to_process=((prefix_length+31)/32)*4;
1846
1847     while (bytes_to_process > 0 ) {
1848
1849         value=tvb_get_guint8(tvb, offset);
1850
1851         if ( (position > 0) && ( (position%2) == 0 ) )
1852             buffer[bufpos++]=':';
1853
1854         sprintf(bytebuf,"%02x",value);
1855         buffer[bufpos++]=bytebuf[0];
1856         buffer[bufpos++]=bytebuf[1];
1857
1858         position++;
1859         offset++;
1860         bytes_to_process--;
1861     }
1862
1863     buffer[bufpos]=0;
1864     proto_tree_add_text(tree, tvb, start_offset, ((prefix_length+31)/32)*4, "Address Prefix: %s",buffer);
1865
1866 }
1867
1868
1869 void
1870 proto_register_ospf(void)
1871 {
1872 /*        static hf_register_info hf[] = {
1873                 { &variable,
1874                 { "Name",           "ospf.abbreviation", TYPE, VALS_POINTER }},
1875         };*/
1876     static gint *ett[] = {
1877         &ett_ospf,
1878         &ett_ospf_hdr,
1879         &ett_ospf_hello,
1880         &ett_ospf_desc,
1881         &ett_ospf_lsr,
1882         &ett_ospf_lsa,
1883         &ett_ospf_lsa_upd,
1884         &ett_ospf_lsa_mpls,
1885         &ett_ospf_lsa_mpls_router,
1886         &ett_ospf_lsa_mpls_link,
1887         &ett_ospf_lsa_mpls_link_stlv
1888     };
1889
1890     proto_ospf = proto_register_protocol("Open Shortest Path First",
1891                                          "OSPF", "ospf");
1892  /*       proto_register_field_array(proto_ospf, hf, array_length(hf));*/
1893     proto_register_subtree_array(ett, array_length(ett));
1894 }
1895
1896 void
1897 proto_reg_handoff_ospf(void)
1898 {
1899     dissector_handle_t ospf_handle;
1900
1901     ospf_handle = create_dissector_handle(dissect_ospf, proto_ospf);
1902     dissector_add("ip.proto", IP_PROTO_OSPF, ospf_handle);
1903     data_handle = find_dissector("data");
1904 }