/* packet-ospf.c * Routines for OSPF packet disassembly * (c) Copyright Hannes R. Boehm * * $Id: packet-ospf.c,v 1.69 2002/08/02 23:35:55 jmayer Exp $ * * At this time, this module is able to analyze OSPF * packets as specified in RFC2328. MOSPF (RFC1584) and other * OSPF Extensions which introduce new Packet types * (e.g the External Atributes LSA) are not supported. * Furthermore RFC2740 (OSPFv3 - OSPF for IPv6) is now supported * - (c) 2001 Palle Lyckegaard * * TOS - support is not fully implemented * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "ipproto.h" #include "in_cksum.h" #include "packet-rsvp.h" #define OSPF_VERSION_2 2 #define OSPF_VERSION_3 3 #define OSPF_VERSION_2_HEADER_LENGTH 24 #define OSPF_VERSION_3_HEADER_LENGTH 16 #define OSPF_HELLO 1 #define OSPF_DB_DESC 2 #define OSPF_LS_REQ 3 #define OSPF_LS_UPD 4 #define OSPF_LS_ACK 5 static const value_string pt_vals[] = { {OSPF_HELLO, "Hello Packet" }, {OSPF_DB_DESC, "DB Descr." }, {OSPF_LS_REQ, "LS Request" }, {OSPF_LS_UPD, "LS Update" }, {OSPF_LS_ACK, "LS Acknowledge" }, {0, NULL } }; #define OSPF_AUTH_NONE 0 #define OSPF_AUTH_SIMPLE 1 #define OSPF_AUTH_CRYPT 2 static const value_string auth_vals[] = { {OSPF_AUTH_NONE, "Null" }, {OSPF_AUTH_SIMPLE, "Simple password" }, {OSPF_AUTH_CRYPT, "Cryptographic" }, {0, NULL } }; #define OSPF_V2_OPTIONS_E 0x02 #define OSPF_V2_OPTIONS_MC 0x04 #define OSPF_V2_OPTIONS_NP 0x08 #define OSPF_V2_OPTIONS_EA 0x10 #define OSPF_V2_OPTIONS_DC 0x20 #define OSPF_V2_OPTIONS_O 0x40 #define OSPF_V2_OPTIONS_DN 0x01 #define OSPF_V3_OPTIONS_V6 0x01 #define OSPF_V3_OPTIONS_E 0x02 #define OSPF_V3_OPTIONS_MC 0x04 #define OSPF_V3_OPTIONS_N 0x08 #define OSPF_V3_OPTIONS_R 0x10 #define OSPF_V3_OPTIONS_DC 0x20 #define OSPF_DBD_FLAG_MS 1 #define OSPF_DBD_FLAG_M 2 #define OSPF_DBD_FLAG_I 4 #define OSPF_LS_REQ_LENGTH 12 #define OSPF_LSTYPE_ROUTER 1 #define OSPF_LSTYPE_NETWORK 2 #define OSPF_LSTYPE_SUMMERY 3 #define OSPF_LSTYPE_ASBR 4 #define OSPF_LSTYPE_ASEXT 5 #define OSPF_LSTYPE_GRPMEMBER 6 #define OSPF_LSTYPE_ASEXT7 7 #define OSPF_LSTYPE_EXTATTR 8 #define OSPF_V3_LSTYPE_ROUTER 0x2001 #define OSPF_V3_LSTYPE_NETWORK 0x2002 #define OSPF_V3_LSTYPE_INTER_AREA_PREFIX 0x2003 #define OSPF_V3_LSTYPE_INTER_AREA_ROUTER 0x2004 #define OSPF_V3_LSTYPE_AS_EXTERNAL 0x4005 #define OSPF_V3_LSTYPE_GROUP_MEMBERSHIP 0x2006 #define OSPF_V3_LSTYPE_TYPE_7 0x2007 #define OSPF_V3_LSTYPE_LINK 0x0008 #define OSPF_V3_LSTYPE_INTRA_AREA_PREFIX 0x2009 /* Opaque LSA types */ #define OSPF_LSTYPE_OP_LINKLOCAL 9 #define OSPF_LSTYPE_OP_AREALOCAL 10 #define OSPF_LSTYPE_OP_ASWIDE 11 #define OSPF_LINK_PTP 1 #define OSPF_LINK_TRANSIT 2 #define OSPF_LINK_STUB 3 #define OSPF_LINK_VIRTUAL 4 #define OSPF_V3_LINK_PTP 1 #define OSPF_V3_LINK_TRANSIT 2 #define OSPF_V3_LINK_RESERVED 3 #define OSPF_V3_LINK_VIRTUAL 4 #define OSPF_LSA_HEADER_LENGTH 20 /* Known opaque LSAs */ #define OSPF_LSA_MPLS_TE 1 static const value_string ls_type_vals[] = { {OSPF_LSTYPE_ROUTER, "Router-LSA" }, {OSPF_LSTYPE_NETWORK, "Network-LSA" }, {OSPF_LSTYPE_SUMMERY, "Summary-LSA (IP network)" }, {OSPF_LSTYPE_ASBR, "Summary-LSA (ASBR)" }, {OSPF_LSTYPE_ASEXT, "AS-External-LSA (ASBR)" }, {OSPF_LSTYPE_GRPMEMBER, "Group Membership LSA" }, {OSPF_LSTYPE_ASEXT7, "NSSA AS-External-LSA" }, {OSPF_LSTYPE_EXTATTR, "External Attributes LSA" }, {OSPF_LSTYPE_OP_LINKLOCAL, "Opaque LSA, Link-local scope" }, {OSPF_LSTYPE_OP_AREALOCAL, "Opaque LSA, Area-local scope" }, {0, NULL } }; static const value_string ls_opaque_type_vals[] = { {OSPF_LSA_MPLS_TE, "Traffic Engineering LSA" }, {2, "Sycamore Optical Topology Descriptions" }, {3, "grace-LSA" }, {0, NULL } }; static const value_string v3_ls_type_vals[] = { {OSPF_V3_LSTYPE_ROUTER, "Router-LSA" }, {OSPF_V3_LSTYPE_NETWORK, "Network-LSA" }, {OSPF_V3_LSTYPE_INTER_AREA_PREFIX, "Inter-Area-Prefix-LSA" }, {OSPF_V3_LSTYPE_INTER_AREA_ROUTER, "Inter-Area-Router-LSA" }, {OSPF_V3_LSTYPE_AS_EXTERNAL, "AS-External-LSA" }, {OSPF_V3_LSTYPE_GROUP_MEMBERSHIP, "Group-Membership-LSA" }, {OSPF_V3_LSTYPE_TYPE_7, "Type-LSA" }, {OSPF_V3_LSTYPE_LINK, "Link-LSA" }, {OSPF_V3_LSTYPE_INTRA_AREA_PREFIX, "Intra-Area-Prefix-LSA" }, {0, NULL } }; #define OSPF_V3_ROUTER_LSA_FLAG_B 0x01 #define OSPF_V3_ROUTER_LSA_FLAG_E 0x02 #define OSPF_V3_ROUTER_LSA_FLAG_V 0x04 #define OSPF_V3_ROUTER_LSA_FLAG_W 0x08 #define OSPF_V3_PREFIX_OPTION_NU 0x01 #define OSPF_V3_PREFIX_OPTION_LA 0x02 #define OSPF_V3_PREFIX_OPTION_MC 0x04 #define OSPF_V3_PREFIX_OPTION_P 0x08 #define OSPF_V3_AS_EXTERNAL_FLAG_T 0x01 #define OSPF_V3_AS_EXTERNAL_FLAG_F 0x02 #define OSPF_V3_AS_EXTERNAL_FLAG_E 0x04 static int proto_ospf = -1; static gint ett_ospf = -1; static gint ett_ospf_hdr = -1; static gint ett_ospf_hello = -1; static gint ett_ospf_desc = -1; static gint ett_ospf_lsr = -1; static gint ett_ospf_lsa = -1; static gint ett_ospf_lsa_upd = -1; /* Trees for opaque LSAs */ static gint ett_ospf_lsa_mpls = -1; static gint ett_ospf_lsa_mpls_router = -1; static gint ett_ospf_lsa_mpls_link = -1; static gint ett_ospf_lsa_mpls_link_stlv = -1; /*----------------------------------------------------------------------- * OSPF Filtering *-----------------------------------------------------------------------*/ /* The OSPF filtering keys */ enum { OSPFF_MSG_TYPE, OSPFF_MSG_MIN, OSPFF_MSG_HELLO, OSPFF_MSG_DB_DESC, OSPFF_MSG_LS_REQ, OSPFF_MSG_LS_UPD, OSPFF_MSG_LS_ACK, OSPFF_LS_TYPE, OSPFF_LS_OPAQUE_TYPE, OSPFF_LS_MPLS_TE_INSTANCE, OSPFF_LS_MIN, OSPFF_LS_ROUTER, OSPFF_LS_NETWORK, OSPFF_LS_SUMMARY, OSPFF_LS_ASBR, OSPFF_LS_ASEXT, OSPFF_LS_GRPMEMBER, OSPFF_LS_ASEXT7, OSPFF_LS_EXTATTR, OSPFF_LS_OPAQUE, OSPFF_SRC_ROUTER, OSPFF_ADV_ROUTER, OSPFF_LS_MPLS, OSPFF_LS_MPLS_ROUTERID, OSPFF_LS_MPLS_LINKID, OSPFF_LS_MPLS_LOCAL_ADDR, OSPFF_LS_MPLS_REMOTE_ADDR, OSPFF_LS_MPLS_LOCAL_IFID, OSPFF_LS_MPLS_REMOTE_IFID, OSPFF_MAX }; static int ospf_filter[OSPFF_MAX]; static hf_register_info ospff_info[] = { /* Message type number */ {&ospf_filter[OSPFF_MSG_TYPE], { "Message Type", "ospf.msg", FT_UINT8, BASE_DEC, VALS(pt_vals), 0x0, "", HFILL }}, /* Message types */ {&ospf_filter[OSPFF_MSG_HELLO], { "Hello", "ospf.msg.hello", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_MSG_DB_DESC], { "Database Description", "ospf.msg.dbdesc", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_MSG_LS_REQ], { "Link State Adv Request", "ospf.msg.lsreq", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_MSG_LS_UPD], { "Link State Adv Update", "ospf.msg.lsupdate", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_MSG_LS_ACK], { "Link State Adv Acknowledgement", "ospf.msg.lsack", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, /* LS Types */ {&ospf_filter[OSPFF_LS_TYPE], { "Link-State Advertisement Type", "ospf.lsa", FT_UINT8, BASE_DEC, VALS(ls_type_vals), 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_OPAQUE_TYPE], { "Link State ID Opaque Type", "ospf.lsid_opaque_type", FT_UINT8, BASE_DEC, VALS(ls_opaque_type_vals), 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_TE_INSTANCE], { "Link State ID TE-LSA Instance", "ospf.lsid_te_lsa.instance", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_ROUTER], { "Router LSA", "ospf.lsa.router", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_NETWORK], { "Network LSA", "ospf.lsa.network", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_SUMMARY], { "Summary LSA (IP Network)", "ospf.lsa.summary", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_ASBR], { "Summary LSA (ASBR)", "ospf.lsa.asbr", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_ASEXT], { "AS-External LSA (ASBR)", "ospf.lsa.asext", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_GRPMEMBER], { "Group Membership LSA", "ospf.lsa.member", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_ASEXT7], { "NSSA AS-External LSA", "ospf.lsa.nssa", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_EXTATTR], { "External Attributes LSA", "ospf.lsa.attr", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_OPAQUE], { "Opaque LSA", "ospf.lsa.opaque", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, /* Other interesting OSPF values */ {&ospf_filter[OSPFF_SRC_ROUTER], { "Source OSPF Router", "ospf.srcrouter", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_ADV_ROUTER], { "Advertising Router", "ospf.advrouter", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS], { "MPLS Traffic Engineering LSA", "ospf.lsa.mpls", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_ROUTERID], { "MPLS/TE Router ID", "ospf.mpls.routerid", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_LINKID], { "MPLS/TE Link ID", "ospf.mpls.linkid", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_LOCAL_ADDR], { "MPLS/TE Local Interface Address", "ospf.mpls.local_addr", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_REMOTE_ADDR], { "MPLS/TE Remote Interface Address", "ospf.mpls.remote_addr", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_LOCAL_IFID], { "MPLS/TE Local Interface Index", "ospf.mpls.local_id", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, {&ospf_filter[OSPFF_LS_MPLS_REMOTE_IFID], { "MPLS/TE Remote Interface Index", "ospf.mpls.remote_id", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, }; static guint8 ospf_msg_type_to_filter (guint8 msg_type) { if (msg_type >= OSPF_HELLO && msg_type <= OSPF_LS_ACK) return msg_type + OSPFF_MSG_MIN; return -1; } static guint8 ospf_ls_type_to_filter (guint8 ls_type) { if (ls_type >= OSPF_LSTYPE_ROUTER && ls_type <= OSPF_LSTYPE_EXTATTR) return OSPFF_LS_MIN + ls_type; else if (ls_type >= OSPF_LSTYPE_OP_LINKLOCAL && ls_type <= OSPF_LSTYPE_OP_ASWIDE) return OSPFF_LS_OPAQUE; else return -1; } static dissector_handle_t data_handle; static void dissect_ospf_hello(tvbuff_t*, int, proto_tree*, guint8); static void dissect_ospf_db_desc(tvbuff_t*, int, proto_tree*, guint8); static void dissect_ospf_ls_req(tvbuff_t*, int, proto_tree*, guint8); static void dissect_ospf_ls_upd(tvbuff_t*, int, proto_tree*, guint8); static void dissect_ospf_ls_ack(tvbuff_t*, int, proto_tree*, guint8); /* dissect_ospf_v[23]lsa returns the offset of the next LSA * if disassemble_body is set to FALSE (e.g. in LSA ACK * packets), the offset is set to the offset of the next * LSA header */ static int dissect_ospf_v2_lsa(tvbuff_t*, int, proto_tree*, gboolean disassemble_body); static int dissect_ospf_v3_lsa(tvbuff_t*, int, proto_tree*, gboolean disassemble_body); static void dissect_ospf_options(tvbuff_t *, int, proto_tree *, guint8); static void dissect_ospf_v3_prefix_options(tvbuff_t *, int, proto_tree *); static void dissect_ospf_v3_address_prefix(tvbuff_t *, int, int, proto_tree *); static void dissect_ospf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *ospf_tree = NULL; proto_item *ti; proto_tree *ospf_header_tree; guint8 version; guint8 packet_type; guint16 ospflen; vec_t cksum_vec[4]; int cksum_vec_len; guint32 phdr[2]; guint16 cksum, computed_cksum; guint length, reported_length; guint16 auth_type; char auth_data[8]; int crypto_len; unsigned int ospf_header_length; guint8 instance_ID; guint8 reserved; guint32 areaid; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "OSPF"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); version = tvb_get_guint8(tvb, 0); switch (version) { case OSPF_VERSION_2: ospf_header_length = OSPF_VERSION_2_HEADER_LENGTH; break; case OSPF_VERSION_3: ospf_header_length = OSPF_VERSION_3_HEADER_LENGTH; break; default: ospf_header_length = 0; break; } packet_type = tvb_get_guint8(tvb, 1); if (check_col(pinfo->cinfo, COL_INFO)) { col_add_str(pinfo->cinfo, COL_INFO, val_to_str(packet_type, pt_vals, "Unknown (%u)")); } if (tree) { ospflen = tvb_get_ntohs(tvb, 2); ti = proto_tree_add_item(tree, proto_ospf, tvb, 0, ospflen, FALSE); ospf_tree = proto_item_add_subtree(ti, ett_ospf); ti = proto_tree_add_text(ospf_tree, tvb, 0, ospf_header_length, "OSPF Header"); ospf_header_tree = proto_item_add_subtree(ti, ett_ospf_hdr); proto_tree_add_text(ospf_header_tree, tvb, 0, 1, "OSPF Version: %u", version); proto_tree_add_item(ospf_header_tree, ospf_filter[OSPFF_MSG_TYPE], tvb, 1, 1, FALSE); proto_tree_add_item_hidden(ospf_header_tree, ospf_filter[ospf_msg_type_to_filter(packet_type)], tvb, 1, 1, FALSE); proto_tree_add_text(ospf_header_tree, tvb, 2, 2, "Packet Length: %u", ospflen); proto_tree_add_item(ospf_header_tree, ospf_filter[OSPFF_SRC_ROUTER], tvb, 4, 4, FALSE); areaid=tvb_get_ntohl(tvb,8); proto_tree_add_text(ospf_header_tree, tvb, 8, 4, "Area ID: %s%s", ip_to_str(tvb_get_ptr(tvb, 8, 4)), areaid == 0 ? " (Backbone)" : ""); cksum = tvb_get_ntohs(tvb, 12); length = tvb_length(tvb); /* XXX - include only the length from the OSPF header? */ reported_length = tvb_reported_length(tvb); if (cksum == 0) { /* No checksum supplied in the packet. */ proto_tree_add_text(ospf_header_tree, tvb, 12, 2, "Packet Checksum: 0x%04x (none)", cksum); } else if (!pinfo->fragmented && length >= reported_length && length >= ospf_header_length && (version == OSPF_VERSION_2 || version == OSPF_VERSION_3)) { /* The packet isn't part of a fragmented datagram and isn't truncated, and we know how to checksum this version of OSPF, so we can checksum it. */ switch (version) { case OSPF_VERSION_2: /* Header, not including the authentication data (the OSPFv2 checksum excludes the 64-bit authentication field). */ cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, 16); cksum_vec[0].len = 16; if (length > ospf_header_length) { /* Rest of the packet, again not including the authentication data. */ reported_length -= ospf_header_length; cksum_vec[1].ptr = tvb_get_ptr(tvb, ospf_header_length, reported_length); cksum_vec[1].len = reported_length; cksum_vec_len = 2; } else { /* There's nothing but a header. */ cksum_vec_len = 1; } break; case OSPF_VERSION_3: /* IPv6-style checksum, covering the entire OSPF packet and a prepended IPv6 pseudo-header. */ /* Set up the fields of the pseudo-header. */ cksum_vec[0].ptr = pinfo->src.data; cksum_vec[0].len = pinfo->src.len; cksum_vec[1].ptr = pinfo->dst.data; cksum_vec[1].len = pinfo->dst.len; cksum_vec[2].ptr = (const guint8 *)&phdr; phdr[0] = g_htonl(ospflen); phdr[1] = g_htonl(IP_PROTO_OSPF); cksum_vec[2].len = 8; cksum_vec[3].ptr = tvb_get_ptr(tvb, 0, reported_length); cksum_vec[3].len = reported_length; cksum_vec_len = 4; break; default: g_assert_not_reached(); cksum_vec_len = 0; } computed_cksum = in_cksum(cksum_vec, cksum_vec_len); if (computed_cksum == 0) { proto_tree_add_text(ospf_header_tree, tvb, 12, 2, "Packet Checksum: 0x%04x (correct)", cksum); } else { proto_tree_add_text(ospf_header_tree, tvb, 12, 2, "Packet Checksum: 0x%04x (incorrect, should be 0x%04x)", cksum, in_cksum_shouldbe(cksum, computed_cksum)); } } else { proto_tree_add_text(ospf_header_tree, tvb, 12, 2, "Packet Checksum: 0x%04x", cksum); } /* Authentication is only valid for OSPFv2 */ if ( version == OSPF_VERSION_2 ) { auth_type = tvb_get_ntohs(tvb, 14); proto_tree_add_text(ospf_header_tree, tvb, 14, 2, "Auth Type: %s", val_to_str(auth_type, auth_vals, "Unknown (%u)")); switch (auth_type) { case OSPF_AUTH_NONE: proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data (none)"); break; case OSPF_AUTH_SIMPLE: tvb_get_nstringz0(tvb, 16, 8, auth_data); proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data: %s", auth_data); break; case OSPF_AUTH_CRYPT: proto_tree_add_text(ospf_header_tree, tvb, 18, 1, "Auth Key ID: %u", tvb_get_guint8(tvb, 18)); crypto_len = tvb_get_guint8(tvb, 19); proto_tree_add_text(ospf_header_tree, tvb, 19, 1, "Auth Data Length: %u", crypto_len); proto_tree_add_text(ospf_header_tree, tvb, 20, 4, "Auth Crypto Sequence Number: 0x%x", tvb_get_ntohl(tvb, 20)); /* Show the message digest that was appended to the end of the OSPF message - but only if it's present (we don't want to get an exception before we've tried dissecting OSPF message). */ if (tvb_bytes_exist(tvb, ospflen, crypto_len)) { proto_tree_add_text(ospf_header_tree, tvb, ospflen, crypto_len, "Auth Data: %s", tvb_bytes_to_str(tvb, ospflen, crypto_len)); } break; default: proto_tree_add_text(ospf_header_tree, tvb, 16, 8, "Auth Data (unknown)"); break; } } /* Instance ID and "reserved" is OSPFv3-only */ if ( version == OSPF_VERSION_3 ) { instance_ID = tvb_get_guint8(tvb, 14); proto_tree_add_text(ospf_header_tree, tvb, 14, 1, "Instance ID: %u", instance_ID); reserved = tvb_get_guint8(tvb, 15); proto_tree_add_text(ospf_header_tree, tvb, 15, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"), reserved); } /* Adjust the length of the tvbuff to match the size of the OSPF * packet (since the dissect routines use it to work out where the * end of the OSPF packet is). */ tvb_set_reported_length(tvb, ospflen); switch (packet_type){ case OSPF_HELLO: dissect_ospf_hello(tvb, ospf_header_length, ospf_tree, version); break; case OSPF_DB_DESC: dissect_ospf_db_desc(tvb, ospf_header_length, ospf_tree, version); break; case OSPF_LS_REQ: dissect_ospf_ls_req(tvb, ospf_header_length, ospf_tree, version); break; case OSPF_LS_UPD: dissect_ospf_ls_upd(tvb, ospf_header_length, ospf_tree, version); break; case OSPF_LS_ACK: dissect_ospf_ls_ack(tvb, ospf_header_length, ospf_tree, version); break; default: call_dissector(data_handle, tvb_new_subset(tvb, ospf_header_length, -1, -1), pinfo, tree); break; } } } static void dissect_ospf_hello(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { proto_tree *ospf_hello_tree; proto_item *ti; ti = proto_tree_add_text(tree, tvb, offset, -1, "OSPF Hello Packet"); ospf_hello_tree = proto_item_add_subtree(ti, ett_ospf_hello); switch (version ) { case OSPF_VERSION_2: proto_tree_add_text(ospf_hello_tree, tvb, offset, 4, "Network Mask: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 2, "Hello Interval: %u seconds", tvb_get_ntohs(tvb, offset + 4)); dissect_ospf_options(tvb, offset + 6, ospf_hello_tree, version); proto_tree_add_text(ospf_hello_tree, tvb, offset + 7, 1, "Router Priority: %u", tvb_get_guint8(tvb, offset + 7)); proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 4, "Router Dead Interval: %u seconds", tvb_get_ntohl(tvb, offset + 8)); proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s", ip_to_str(tvb_get_ptr(tvb, offset + 12, 4))); proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s", ip_to_str(tvb_get_ptr(tvb, offset + 16, 4))); offset += 20; while (tvb_reported_length_remaining(tvb, offset) != 0) { proto_tree_add_text(ospf_hello_tree, tvb, offset, 4, "Active Neighbor: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; } break; case OSPF_VERSION_3: proto_tree_add_text(ospf_hello_tree, tvb, offset + 0, 4, "Interface ID: %u", tvb_get_ntohl(tvb, offset + 0)); proto_tree_add_text(ospf_hello_tree, tvb, offset + 4, 1, "Router Priority: %u", tvb_get_guint8(tvb, offset + 4)); dissect_ospf_options(tvb, offset + 5, ospf_hello_tree, version); proto_tree_add_text(ospf_hello_tree, tvb, offset + 8, 2, "Hello Interval: %u seconds", tvb_get_ntohs(tvb, offset + 8)); proto_tree_add_text(ospf_hello_tree, tvb, offset + 10, 2, "Router Dead Interval: %u seconds", tvb_get_ntohs(tvb, offset + 10)); proto_tree_add_text(ospf_hello_tree, tvb, offset + 12, 4, "Designated Router: %s", ip_to_str(tvb_get_ptr(tvb, offset + 12, 4))); proto_tree_add_text(ospf_hello_tree, tvb, offset + 16, 4, "Backup Designated Router: %s", ip_to_str(tvb_get_ptr(tvb, offset + 16, 4))); offset += 20; while (tvb_reported_length_remaining(tvb, offset) != 0) { proto_tree_add_text(ospf_hello_tree, tvb, offset, 4, "Active Neighbor: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; } break; default: break; } } static void dissect_ospf_db_desc(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { proto_tree *ospf_db_desc_tree=NULL; proto_item *ti; guint8 flags; guint8 reserved; char flags_string[20] = ""; if (tree) { ti = proto_tree_add_text(tree, tvb, offset, -1, "OSPF DB Description"); ospf_db_desc_tree = proto_item_add_subtree(ti, ett_ospf_desc); switch (version ) { case OSPF_VERSION_2: proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 2, "Interface MTU: %u", tvb_get_ntohs(tvb, offset)); dissect_ospf_options(tvb, offset + 2, ospf_db_desc_tree, version); flags = tvb_get_guint8(tvb, offset + 3); if (flags & OSPF_DBD_FLAG_MS) strcat(flags_string, "MS"); if (flags & OSPF_DBD_FLAG_M) { if (flags_string[0] != '\0') strcat(flags_string, "/"); strcat(flags_string, "M"); } if (flags & OSPF_DBD_FLAG_I) { if (flags_string[0] != '\0') strcat(flags_string, "/"); strcat(flags_string, "I"); } proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 3, 1, "Flags: 0x%x (%s)", flags, flags_string); proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 4, "DD Sequence: %u", tvb_get_ntohl(tvb, offset + 4)); offset += 8; break; case OSPF_VERSION_3: reserved = tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_db_desc_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"), reserved); dissect_ospf_options(tvb, offset + 1, ospf_db_desc_tree, version); proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 4, 2, "Interface MTU: %u", tvb_get_ntohs(tvb, offset+4)); reserved = tvb_get_guint8(tvb, offset + 6); proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 6, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"), reserved); flags = tvb_get_guint8(tvb, offset + 7); if (flags & OSPF_DBD_FLAG_MS) strcat(flags_string, "MS"); if (flags & OSPF_DBD_FLAG_M) { if (flags_string[0] != '\0') strcat(flags_string, "/"); strcat(flags_string, "M"); } if (flags & OSPF_DBD_FLAG_I) { if (flags_string[0] != '\0') strcat(flags_string, "/"); strcat(flags_string, "I"); } proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 7, 1, "Flags: 0x%x (%s)", flags, flags_string); proto_tree_add_text(ospf_db_desc_tree, tvb, offset + 8, 4, "DD Sequence: %u", tvb_get_ntohl(tvb, offset + 8)); offset += 12; break; default: break; } } /* LS Headers will be processed here */ /* skip to the end of DB-Desc header */ while (tvb_reported_length_remaining(tvb, offset) != 0) { if ( version == OSPF_VERSION_2) offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE); else if ( version == OSPF_VERSION_3) offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE); } } static void dissect_ospf_ls_req(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { proto_tree *ospf_lsr_tree; proto_item *ti; guint32 ls_type; guint8 reserved; /* zero or more LS requests may be within a LS Request */ /* we place every request for a LSA in a single subtree */ while (tvb_reported_length_remaining(tvb, offset) != 0) { ti = proto_tree_add_text(tree, tvb, offset, OSPF_LS_REQ_LENGTH, "Link State Request"); ospf_lsr_tree = proto_item_add_subtree(ti, ett_ospf_lsr); switch ( version ) { case OSPF_VERSION_2: ls_type = tvb_get_ntohl(tvb, offset); proto_tree_add_item(ospf_lsr_tree, ospf_filter[OSPFF_LS_TYPE], tvb, offset, 4, FALSE); break; case OSPF_VERSION_3: reserved = tvb_get_ntohs(tvb, offset); proto_tree_add_text(ospf_lsr_tree, tvb, offset, 2, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"), reserved); ls_type = tvb_get_ntohs(tvb, offset+2); proto_tree_add_text(ospf_lsr_tree, tvb, offset+2, 2, "LS Type: %s (0x%04x)", val_to_str(ls_type, v3_ls_type_vals, "Unknown"), ls_type); break; default: ls_type=0; break; } proto_tree_add_text(ospf_lsr_tree, tvb, offset + 4, 4, "Link State ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4))); proto_tree_add_item(ospf_lsr_tree, ospf_filter[OSPFF_ADV_ROUTER], tvb, offset + 8, 4, FALSE); offset += 12; } } static void dissect_ospf_ls_upd(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { proto_tree *ospf_lsa_upd_tree=NULL; proto_item *ti; guint32 lsa_nr; guint32 lsa_counter; ti = proto_tree_add_text(tree, tvb, offset, -1, "LS Update Packet"); ospf_lsa_upd_tree = proto_item_add_subtree(ti, ett_ospf_lsa_upd); lsa_nr = tvb_get_ntohl(tvb, offset); proto_tree_add_text(ospf_lsa_upd_tree, tvb, offset, 4, "Number of LSAs: %u", lsa_nr); /* skip to the beginning of the first LSA */ offset += 4; /* the LS Upd Packet contains only a 32 bit #LSAs field */ lsa_counter = 0; while (lsa_counter < lsa_nr) { if ( version == OSPF_VERSION_2) offset = dissect_ospf_v2_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE); else if ( version == OSPF_VERSION_3) offset = dissect_ospf_v3_lsa(tvb, offset, ospf_lsa_upd_tree, TRUE); lsa_counter += 1; } } static void dissect_ospf_ls_ack(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { /* the body of a LS Ack packet simply contains zero or more LSA Headers */ while (tvb_reported_length_remaining(tvb, offset) != 0) { if ( version == OSPF_VERSION_2) offset = dissect_ospf_v2_lsa(tvb, offset, tree, FALSE); else if ( version == OSPF_VERSION_3) offset = dissect_ospf_v3_lsa(tvb, offset, tree, FALSE); } } /* * Returns if an LSA is opaque, i.e. requires special treatment */ static int is_opaque(int lsa_type) { return (lsa_type >= OSPF_LSTYPE_OP_LINKLOCAL && lsa_type <= OSPF_LSTYPE_OP_ASWIDE); } /* MPLS/TE TLV types */ #define MPLS_TLV_ROUTER 1 #define MPLS_TLV_LINK 2 /* MPLS/TE Link STLV types */ enum { MPLS_LINK_TYPE = 1, MPLS_LINK_ID, MPLS_LINK_LOCAL_IF, MPLS_LINK_REMOTE_IF, MPLS_LINK_TE_METRIC, MPLS_LINK_MAX_BW, MPLS_LINK_MAX_RES_BW, MPLS_LINK_UNRES_BW, MPLS_LINK_COLOR, MPLS_LINK_LOCAL_ID = 11, MPLS_LINK_REMOTE_ID, MPLS_LINK_PROTECTION = 14, MPLS_LINK_IF_SWITCHING_DESC, MPLS_LINK_SHARED_RISK_GROUP, }; static const value_string mpls_link_stlv_str[] = { {MPLS_LINK_TYPE, "Link Type"}, {MPLS_LINK_ID, "Link ID"}, {MPLS_LINK_LOCAL_IF, "Local Interface IP Address"}, {MPLS_LINK_REMOTE_IF, "Remote Interface IP Address"}, {MPLS_LINK_TE_METRIC, "Traffic Engineering Metric"}, {MPLS_LINK_MAX_BW, "Maximum Bandwidth"}, {MPLS_LINK_MAX_RES_BW, "Maximum Reservable Bandwidth"}, {MPLS_LINK_UNRES_BW, "Unreserved Bandwidth"}, {MPLS_LINK_COLOR, "Resource Class/Color"}, {MPLS_LINK_LOCAL_ID, "Link Local Identifier"}, {MPLS_LINK_REMOTE_ID, "Link Remote Identifier"}, {MPLS_LINK_PROTECTION, "Link Protection Type"}, {MPLS_LINK_IF_SWITCHING_DESC, "Interface Switching Capability Descriptor"}, {MPLS_LINK_SHARED_RISK_GROUP, "Shared Risk Link Group"}, {0, NULL}, }; /* * Dissect MPLS/TE opaque LSA */ static void dissect_ospf_lsa_mpls(tvbuff_t *tvb, int offset, proto_tree *tree, guint32 length) { proto_item *ti; proto_tree *mpls_tree; proto_tree *tlv_tree; proto_tree *stlv_tree; int tlv_type; int tlv_length; int tlv_end_offset; int stlv_type, stlv_len, stlv_offset; char *stlv_name; int i; ti = proto_tree_add_text(tree, tvb, offset, length, "MPLS Traffic Engineering LSA"); proto_tree_add_item_hidden(tree, ospf_filter[OSPFF_LS_MPLS], tvb, offset, 2, FALSE); mpls_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls); while (length != 0) { tlv_type = tvb_get_ntohs(tvb, offset); tlv_length = tvb_get_ntohs(tvb, offset + 2); tlv_end_offset = offset + tlv_length + 4; switch (tlv_type) { case MPLS_TLV_ROUTER: ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4, "Router Address: %s", ip_to_str(tvb_get_ptr(tvb, offset+4, 4))); tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_router); proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 1 - Router Address"); proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u", tlv_length); proto_tree_add_item(tlv_tree, ospf_filter[OSPFF_LS_MPLS_ROUTERID], tvb, offset+4, 4, FALSE); break; case MPLS_TLV_LINK: ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4, "Link Information"); tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link); proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: 2 - Link Information"); proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u", tlv_length); stlv_offset = offset + 4; /* Walk down the sub-TLVs for link information */ while (stlv_offset < tlv_end_offset) { stlv_type = tvb_get_ntohs(tvb, stlv_offset); stlv_len = tvb_get_ntohs(tvb, stlv_offset + 2); stlv_name = val_to_str(stlv_type, mpls_link_stlv_str, "Unknown sub-TLV"); switch (stlv_type) { case MPLS_LINK_TYPE: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s: %u", stlv_name, tvb_get_guint8(tvb, stlv_offset + 4)); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 1, "%s: %u", stlv_name, tvb_get_guint8(tvb, stlv_offset + 4)); break; case MPLS_LINK_ID: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s: %s (%x)", stlv_name, ip_to_str(tvb_get_ptr(tvb, stlv_offset + 4, 4)), tvb_get_ntohl(tvb, stlv_offset + 4)); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_item(stlv_tree, ospf_filter[OSPFF_LS_MPLS_LINKID], tvb, stlv_offset+4, 4, FALSE); break; case MPLS_LINK_LOCAL_IF: case MPLS_LINK_REMOTE_IF: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s", stlv_name); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); /* The Local/Remote Interface IP Address sub-TLV is TLV type 3/4, and is 4N octets in length, where N is the number of neighbor addresses. */ for (i=0; i < stlv_len; i+=4) proto_tree_add_item(stlv_tree, stlv_type==MPLS_LINK_LOCAL_IF ? ospf_filter[OSPFF_LS_MPLS_LOCAL_ADDR] : ospf_filter[OSPFF_LS_MPLS_REMOTE_ADDR], tvb, stlv_offset+4+i, 4, FALSE); break; case MPLS_LINK_TE_METRIC: case MPLS_LINK_COLOR: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s: %u", stlv_name, tvb_get_ntohl(tvb, stlv_offset + 4)); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %u", stlv_name, tvb_get_ntohl(tvb, stlv_offset + 4)); break; case MPLS_LINK_MAX_BW: case MPLS_LINK_MAX_RES_BW: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s: %.10g", stlv_name, tvb_get_ntohieee_float(tvb, stlv_offset + 4)); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 4, "%s: %.10g", stlv_name, tvb_get_ntohieee_float(tvb, stlv_offset + 4)); break; case MPLS_LINK_UNRES_BW: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s", stlv_name); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); for (i = 0; i < 8; i++) { proto_tree_add_text(stlv_tree, tvb, stlv_offset+4+(i*4), 4, "Pri %d: %.10g bytes/s (%.0f bits/s)", i, tvb_get_ntohieee_float(tvb, stlv_offset + 4 + i*4), tvb_get_ntohieee_float(tvb, stlv_offset + 4 + i*4) * 8.0); } break; case MPLS_LINK_LOCAL_ID: case MPLS_LINK_REMOTE_ID: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s: %d (0x%x)", stlv_name, tvb_get_ntohl(tvb, stlv_offset + 4), tvb_get_ntohl(tvb, stlv_offset + 4)); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_item(stlv_tree, stlv_type==MPLS_LINK_LOCAL_ID ? ospf_filter[OSPFF_LS_MPLS_LOCAL_IFID] : ospf_filter[OSPFF_LS_MPLS_REMOTE_IFID], tvb, stlv_offset+4, 4, FALSE); break; case MPLS_LINK_IF_SWITCHING_DESC: ti = proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "%s", stlv_name); stlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv); proto_tree_add_text(stlv_tree, tvb, stlv_offset, 2, "TLV Type: %u: %s", stlv_type, stlv_name); proto_tree_add_text(stlv_tree, tvb, stlv_offset+2, 2, "TLV Length: %u", stlv_len); proto_tree_add_text(stlv_tree, tvb, stlv_offset+4, 1, "Switching Type: %s", val_to_str(tvb_get_guint8(tvb,stlv_offset+4), gmpls_switching_type_str, "Unknown (%d)")); proto_tree_add_text(stlv_tree, tvb, stlv_offset+5, 1, "Encoding: %s", val_to_str(tvb_get_guint8(tvb,stlv_offset+5), gmpls_lsp_enc_str, "Unknown (%d)")); for (i = 0; i < 8; i++) { proto_tree_add_text(stlv_tree, tvb, stlv_offset+8+(i*4), 4, "Pri %d: %.10g bytes/s (%.0f bits/s)", i, tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4), tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4) * 8.0); } break; default: proto_tree_add_text(tlv_tree, tvb, stlv_offset, stlv_len+4, "Unknown Link sub-TLV: %u", stlv_type); break; } stlv_offset += ((stlv_len+4+3)/4)*4; } break; default: ti = proto_tree_add_text(mpls_tree, tvb, offset, tlv_length+4, "Unknown LSA: %u", tlv_type); tlv_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link); proto_tree_add_text(tlv_tree, tvb, offset, 2, "TLV Type: %u - Unknown", tlv_type); proto_tree_add_text(tlv_tree, tvb, offset+2, 2, "TLV Length: %u", tlv_length); proto_tree_add_text(tlv_tree, tvb, offset+4, tlv_length, "TLV Data"); break; } offset += tlv_length + 4; length -= tlv_length + 4; } } /* * Dissect opaque LSAs */ static void dissect_ospf_lsa_opaque(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 ls_id_type, guint32 length) { switch (ls_id_type) { case OSPF_LSA_MPLS_TE: dissect_ospf_lsa_mpls(tvb, offset, tree, length); break; default: proto_tree_add_text(tree, tvb, offset, length, "Unknown LSA Type %u", ls_id_type); break; } /* switch on opaque LSA id */ } static int dissect_ospf_v2_lsa(tvbuff_t *tvb, int offset, proto_tree *tree, gboolean disassemble_body) { proto_tree *ospf_lsa_tree; proto_item *ti; guint8 ls_type; guint16 ls_length; int end_offset; guint8 nr_links; guint16 nr_tos; /* router LSA */ guint8 link_type; guint16 link_counter; guint8 tos_counter; char *link_type_str; char *link_id; /* AS-external LSA */ guint8 options; /* opaque LSA */ guint8 ls_id_type; ls_type = tvb_get_guint8(tvb, offset + 3); ls_length = tvb_get_ntohs(tvb, offset + 18); end_offset = offset + ls_length; if (disassemble_body) { ti = proto_tree_add_text(tree, tvb, offset, ls_length, "LS Type: %s", val_to_str(ls_type, ls_type_vals, "Unknown (%d)")); } else { ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH, "LSA Header"); } ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds", tvb_get_ntohs(tvb, offset)); dissect_ospf_options(tvb, offset + 2, ospf_lsa_tree, OSPF_VERSION_2); proto_tree_add_item(ospf_lsa_tree, ospf_filter[OSPFF_LS_TYPE], tvb, offset + 3, 1, FALSE); proto_tree_add_item_hidden(ospf_lsa_tree, ospf_filter[ospf_ls_type_to_filter(ls_type)], tvb, offset + 3, 1, FALSE); if (is_opaque(ls_type)) { ls_id_type = tvb_get_guint8(tvb, offset + 4); proto_tree_add_uint(ospf_lsa_tree, ospf_filter[OSPFF_LS_OPAQUE_TYPE], tvb, offset + 4, 1, ls_id_type); switch (ls_id_type) { case OSPF_LSA_MPLS_TE: proto_tree_add_text(ospf_lsa_tree, tvb, offset + 5, 1, "Link State ID TE-LSA Reserved: %u", tvb_get_guint8(tvb, offset + 5)); proto_tree_add_item(ospf_lsa_tree, ospf_filter[OSPFF_LS_MPLS_TE_INSTANCE], tvb, offset + 6, 2, FALSE); break; default: proto_tree_add_text(ospf_lsa_tree, tvb, offset + 5, 3, "Link State ID Opaque ID: %u", tvb_get_ntoh24(tvb, offset + 5)); break; } } else { ls_id_type = 0; proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4))); } proto_tree_add_item(ospf_lsa_tree, ospf_filter[OSPFF_ADV_ROUTER], tvb, offset + 8, 4, FALSE); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: 0x%04x", tvb_get_ntohl(tvb, offset + 12)); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x", tvb_get_ntohs(tvb, offset + 16)); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u", ls_length); /* skip past the LSA header to the body */ offset += OSPF_LSA_HEADER_LENGTH; if (ls_length <= OSPF_LSA_HEADER_LENGTH) return offset; /* no data, or bogus length */ ls_length -= OSPF_LSA_HEADER_LENGTH; if (!disassemble_body) return offset; switch (ls_type){ case OSPF_LSTYPE_ROUTER: /* again: flags should be secified in detail */ proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x", tvb_get_guint8(tvb, offset)); nr_links = tvb_get_ntohs(tvb, offset + 2); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "Number of Links: %u", nr_links); offset += 4; /* nr_links links follow * maybe we should put each of the links into its own subtree ??? */ for (link_counter = 1; link_counter <= nr_links; link_counter++) { /* check the Link Type and ID */ link_type = tvb_get_guint8(tvb, offset + 8); switch (link_type) { case OSPF_LINK_PTP: link_type_str="Point-to-point connection to another router"; link_id="Neighboring router's Router ID"; break; case OSPF_LINK_TRANSIT: link_type_str="Connection to a transit network"; link_id="IP address of Designated Router"; break; case OSPF_LINK_STUB: link_type_str="Connection to a stub network"; link_id="IP network/subnet number"; break; case OSPF_LINK_VIRTUAL: link_type_str="Virtual link"; link_id="Neighboring router's Router ID"; break; default: link_type_str="Unknown link type"; link_id="Unknown link ID"; break; } proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "%s: %s", link_id, ip_to_str(tvb_get_ptr(tvb, offset, 4))); /* link_data should be specified in detail (e.g. network mask) (depends on link type)*/ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link Data: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4))); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 1, "Link Type: %u - %s", link_type, link_type_str); nr_tos = tvb_get_guint8(tvb, offset + 9); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 9, 1, "Number of TOS metrics: %u", nr_tos); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 10, 2, "TOS 0 metric: %u", tvb_get_ntohs(tvb, offset + 10)); offset += 12; /* nr_tos metrics may follow each link * ATTENTION: TOS metrics are not tested (I don't have TOS * based routing) * please send me a mail if it is/isn't working */ for (tos_counter = 1; tos_counter <= nr_tos; tos_counter++) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u", tvb_get_guint8(tvb, offset), tvb_get_ntohs(tvb, offset + 2)); offset += 4; } } break; case OSPF_LSTYPE_NETWORK: proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; while (offset < end_offset) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; } break; case OSPF_LSTYPE_SUMMERY: /* Type 3 and 4 LSAs have the same format */ case OSPF_LSTYPE_ASBR: proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Metric: %u", tvb_get_ntoh24(tvb, offset + 1)); offset += 4; /* TOS-specific information, if any */ while (offset < end_offset) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u", tvb_get_guint8(tvb, offset), tvb_get_ntoh24(tvb, offset + 1)); offset += 4; } break; case OSPF_LSTYPE_ASEXT: case OSPF_LSTYPE_ASEXT7: proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Netmask: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; options = tvb_get_guint8(tvb, offset); if (options & 0x80) { /* check wether or not E bit is set */ proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "External Type: Type 2 (metric is larger than any other link state path)"); } else { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "External Type: Type 1 (metric is specified in the same units as interface cost)"); } /* the metric field of a AS-external LAS is specified in 3 bytes */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3, "Metric: %u", tvb_get_ntoh24(tvb, offset + 1)); offset += 4; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u", tvb_get_ntohl(tvb, offset)); offset += 4; /* TOS-specific information, if any */ while (offset < end_offset) { options = tvb_get_guint8(tvb, offset); if (options & 0x80) { /* check wether or not E bit is set */ proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "External Type: Type 2 (metric is larger than any other link state path)"); } else { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "External Type: Type 1 (metric is specified in the same units as interface cost)"); } proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "TOS: %u, Metric: %u", options & 0x7F, tvb_get_ntoh24(tvb, offset + 1)); offset += 4; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Forwarding Address: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "External Route Tag: %u", tvb_get_ntohl(tvb, offset)); offset += 4; } break; case OSPF_LSTYPE_OP_LINKLOCAL: case OSPF_LSTYPE_OP_AREALOCAL: case OSPF_LSTYPE_OP_ASWIDE: /* * RFC 2370 opaque LSAs. */ dissect_ospf_lsa_opaque(tvb, offset, ospf_lsa_tree, ls_id_type, ls_length); offset += ls_length; break; default: /* unknown LSA type */ proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length, "Unknown LSA Type"); offset += ls_length; break; } /* return the offset of the next LSA */ return offset; } static int dissect_ospf_v3_lsa(tvbuff_t *tvb, int offset, proto_tree *tree, gboolean disassemble_body) { proto_tree *ospf_lsa_tree; proto_item *ti; guint16 ls_type; guint16 ls_length; int end_offset; guint8 reserved; /* router LSA */ guint8 link_type; char *link_type_str; guint32 metric; guint8 router_lsa_flags; char router_lsa_flags_string[5]; guint8 router_priority; guint32 number_prefixes; guint8 prefix_length; guint16 reserved16; guint16 referenced_ls_type; guint8 flags; guint8 flags_string[4]; guint32 external_route_tag; ls_type = tvb_get_ntohs(tvb, offset + 2); ls_length = tvb_get_ntohs(tvb, offset + 18); end_offset = offset + ls_length; if (disassemble_body) { ti = proto_tree_add_text(tree, tvb, offset, ls_length, "%s (Type: 0x%04x)", val_to_str(ls_type, v3_ls_type_vals,"Unknown"), ls_type); } else { ti = proto_tree_add_text(tree, tvb, offset, OSPF_LSA_HEADER_LENGTH, "LSA Header"); } ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2, "LS Age: %u seconds", tvb_get_ntohs(tvb, offset)); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2, "LSA Type: 0x%04x (%s)", ls_type, val_to_str(ls_type, v3_ls_type_vals,"Unkown")); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Link State ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4))); proto_tree_add_item(ospf_lsa_tree, ospf_filter[OSPFF_ADV_ROUTER], tvb, offset + 8, 4, FALSE); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "LS Sequence Number: %d", tvb_get_ntohl(tvb, offset + 12)); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 16, 2, "LS Checksum: %04x", tvb_get_ntohs(tvb, offset + 16)); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 18, 2, "Length: %u", ls_length); /* skip past the LSA header to the body */ offset += OSPF_LSA_HEADER_LENGTH; ls_length -= OSPF_LSA_HEADER_LENGTH; if (!disassemble_body) return offset; switch (ls_type){ case OSPF_V3_LSTYPE_ROUTER: /* flags field in an router-lsa */ router_lsa_flags=tvb_get_guint8(tvb,offset); if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_B) router_lsa_flags_string[3] = 'B'; else router_lsa_flags_string[3] = '.'; if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_E) router_lsa_flags_string[2] = 'E'; else router_lsa_flags_string[2] = '.'; if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_V) router_lsa_flags_string[1] = 'V'; else router_lsa_flags_string[1] = '.'; if (router_lsa_flags & OSPF_V3_ROUTER_LSA_FLAG_W) router_lsa_flags_string[0] = 'W'; else router_lsa_flags_string[0] = '.'; router_lsa_flags_string[4]=0; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)", router_lsa_flags, router_lsa_flags_string); /* options field in an router-lsa */ dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3); /* skip the router-lsa flags and options */ offset+=4; ls_length-=4; if (ls_length > 0) proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length, "Router Interfaces:"); /* scan all router-lsa router interfaces */ /* maybe we should put each of the links into its own subtree ??? */ while (ls_length > 0 ) { /* check the type */ link_type = tvb_get_guint8(tvb, offset); switch (link_type) { case OSPF_V3_LINK_PTP: link_type_str="Point-to-point connection to another router"; break; case OSPF_V3_LINK_TRANSIT: link_type_str="Connection to a transit network"; break; case OSPF_V3_LINK_RESERVED: link_type_str="Connection to a stub network"; break; case OSPF_V3_LINK_VIRTUAL: link_type_str="Virtual link"; break; default: link_type_str="Unknown link type"; break; } proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Type: %u (%s)", link_type,link_type_str); /* reserved field */ reserved = tvb_get_guint8(tvb, offset+1); proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved); /* metric */ metric=tvb_get_ntohs(tvb, offset+2); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 2, 2,"Metric: %u",metric); /* Interface ID */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Interface ID: %u", tvb_get_ntohl(tvb, offset + 4)); /* Neighbor Interface ID */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Neighbor Interface ID: %u", tvb_get_ntohl(tvb, offset + 8)); /* Neighbor Router ID */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 12, 4, "Neighbor Router ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 12, 4))); /* skip to the (possible) next entry */ offset+=16; ls_length-=16; } break; case OSPF_V3_LSTYPE_NETWORK: /* reserved field */ reserved = tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved); /* options field in an network-lsa */ dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3); offset += 4; ls_length-=4; while (ls_length > 0 ) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Attached Router: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); ls_length-=4; offset += 4; } break; case OSPF_V3_LSTYPE_INTER_AREA_PREFIX: /* reserved field */ reserved = tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved); /* metric */ metric=tvb_get_ntoh24(tvb, offset+11); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 1, 3,"Metric: %u",metric); /* prefix length */ prefix_length=tvb_get_guint8(tvb, offset+4); proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length); /* prefix options */ dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree); /* 16 bits reserved */ reserved16=tvb_get_ntohs(tvb, offset+6); proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2, (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16); offset+=8; /* address_prefix */ dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree); offset+=(prefix_length+31)/32*4; break; case OSPF_V3_LSTYPE_INTER_AREA_ROUTER: /* reserved field */ reserved = tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved); /* options field in an inter-area-router-lsa */ dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3); /* reserved field */ reserved = tvb_get_guint8(tvb, offset+4); proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, (reserved == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved); /* metric */ metric=tvb_get_ntoh24(tvb, offset+6); proto_tree_add_text(ospf_lsa_tree, tvb, offset + 6, 3,"Metric: %u",metric); /* Destination Router ID */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Destination Router ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 8, 4))); offset+=12; break; case OSPF_V3_LSTYPE_AS_EXTERNAL: /* flags */ flags=tvb_get_guint8(tvb, offset); if (flags & OSPF_V3_AS_EXTERNAL_FLAG_E) flags_string[0] = 'E'; else flags_string[0] = '.'; if (flags & OSPF_V3_AS_EXTERNAL_FLAG_F) flags_string[1] = 'F'; else flags_string[1] = '.'; if (flags & OSPF_V3_AS_EXTERNAL_FLAG_T) flags_string[2] = 'T'; else flags_string[2] = '.'; flags_string[3]=0; proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Flags: 0x%02x (%s)", flags, flags_string); /* 24 bits metric */ metric=tvb_get_ntoh24(tvb, offset+1); proto_tree_add_text(ospf_lsa_tree, tvb, offset+1, 3, "Metric: %u", metric); /* prefix length */ prefix_length=tvb_get_guint8(tvb, offset+4); proto_tree_add_text(ospf_lsa_tree, tvb, offset+4, 1, "PrefixLength: %u",prefix_length); /* prefix options */ dissect_ospf_v3_prefix_options(tvb, offset+5, ospf_lsa_tree); /* referenced LS type */ referenced_ls_type=tvb_get_ntohs(tvb, offset+6); proto_tree_add_text(ospf_lsa_tree, tvb, offset+6, 2,"Referenced LS type 0x%04x (%s)", referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown")); offset+=8; /* address_prefix */ dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree); offset+=(prefix_length+31)/32*4; /* Forwarding Address (optional - only if F-flag is on) */ if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_F) ) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 16,"Forwarding Address: %s", ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset, 16))); offset+=16; } /* External Route Tag (optional - only if T-flag is on) */ if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_T) ) { external_route_tag=tvb_get_ntohl(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4,"External Route Tag: 0x%04x", external_route_tag); offset+=4; } /* Referenced Link State ID (optional - only if Referenced LS type is non-zero */ if ( (offset < end_offset) && (referenced_ls_type != 0) ) { proto_tree_add_text(ospf_lsa_tree, tvb, offset, 4, "Referenced Link State ID: %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset+=4; } break; case OSPF_V3_LSTYPE_LINK: /* router priority */ router_priority=tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "Router Priority: %u", router_priority); /* options field in an link-lsa */ dissect_ospf_options(tvb, offset + 1, ospf_lsa_tree, OSPF_VERSION_3); /* Link-local Interface Address */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 16, "Link-local Interface Address: %s", ip6_to_str((struct e_in6_addr *)tvb_get_ptr(tvb, offset + 4, 16))); /* Number prefixes */ number_prefixes=tvb_get_ntohl(tvb, offset + 20); proto_tree_add_text(ospf_lsa_tree, tvb, offset+20, 4, "# prefixes: %d",number_prefixes); offset+=24; while (number_prefixes > 0) { /* prefix length */ prefix_length=tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length); /* prefix options */ dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree); /* 16 bits reserved */ reserved16=tvb_get_ntohs(tvb, offset+2); proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2, (reserved16 == 0 ? "Reserved: %u" : "Reserved: %u (incorrect, should be 0)"),reserved16); offset+=4; /* address_prefix */ dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree); offset+=(prefix_length+31)/32*4; number_prefixes--; } break; case OSPF_V3_LSTYPE_INTRA_AREA_PREFIX: /* # prefixes */ number_prefixes=tvb_get_ntohs(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 2,"# prefixes: %u",number_prefixes); /* referenced LS type */ referenced_ls_type=tvb_get_ntohs(tvb, offset+2); proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2,"Referenced LS type 0x%04x (%s)", referenced_ls_type, val_to_str(referenced_ls_type, v3_ls_type_vals, "Unknown")); /* Referenced Link State ID */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 4, 4, "Referenced Link State ID: %s", ip_to_str(tvb_get_ptr(tvb, offset + 4, 4))); /* Referenced Advertising Router */ proto_tree_add_text(ospf_lsa_tree, tvb, offset + 8, 4, "Referenced Advertising Router: %s", ip_to_str(tvb_get_ptr(tvb, offset + 8, 4))); offset+=12; while (number_prefixes > 0) { /* prefix length */ prefix_length=tvb_get_guint8(tvb, offset); proto_tree_add_text(ospf_lsa_tree, tvb, offset, 1, "PrefixLength: %u",prefix_length); /* prefix options */ dissect_ospf_v3_prefix_options(tvb, offset+1, ospf_lsa_tree); /* 16 bits metric */ metric=tvb_get_ntohs(tvb, offset+2); proto_tree_add_text(ospf_lsa_tree, tvb, offset+2, 2, "Metric: %u", metric); offset+=4; /* address_prefix */ dissect_ospf_v3_address_prefix(tvb, offset, prefix_length, ospf_lsa_tree); offset+=(prefix_length+31)/32*4; number_prefixes--; } break; default: /* unknown LSA type */ proto_tree_add_text(ospf_lsa_tree, tvb, offset, ls_length, "Unknown LSA Type 0x%04x",ls_type); offset += ls_length; break; } /* return the offset of the next LSA */ return offset; } static void dissect_ospf_options(tvbuff_t *tvb, int offset, proto_tree *tree, guint8 version) { guint8 options_ospfv2; guint32 options_ospfv3; char options_string[20] = ""; /* ATTENTION !!! no check for length of options string - with OSPFv3 maximum length is 14 characters */ switch ( version ) { case OSPF_VERSION_2: options_ospfv2 = tvb_get_guint8(tvb, offset); if (options_ospfv2 & OSPF_V2_OPTIONS_E) strcat(options_string, "E"); if (options_ospfv2 & OSPF_V2_OPTIONS_MC) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "MC"); } if (options_ospfv2 & OSPF_V2_OPTIONS_NP) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "NP"); } if (options_ospfv2 & OSPF_V2_OPTIONS_EA) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "EA"); } if (options_ospfv2 & OSPF_V2_OPTIONS_DC) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "DC"); } if (options_ospfv2 & OSPF_V2_OPTIONS_O) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "O"); } if (options_ospfv2 & OSPF_V2_OPTIONS_DN) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "DN"); } proto_tree_add_text(tree, tvb, offset, 1, "Options: 0x%x (%s)", options_ospfv2, options_string); break; case OSPF_VERSION_3: options_ospfv3 = tvb_get_ntoh24(tvb, offset); if (options_ospfv3 & OSPF_V3_OPTIONS_V6) strcat(options_string, "V6"); if (options_ospfv3 & OSPF_V3_OPTIONS_E) if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "E"); if (options_ospfv3 & OSPF_V3_OPTIONS_MC) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "MC"); } if (options_ospfv3 & OSPF_V3_OPTIONS_N) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "N"); } if (options_ospfv3 & OSPF_V3_OPTIONS_R) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "R"); } if (options_ospfv3 & OSPF_V3_OPTIONS_DC) { if (options_string[0] != '\0') strcat(options_string, "/"); strcat(options_string, "DC"); } proto_tree_add_text(tree, tvb, offset, 3, "Options: 0x%x (%s)", options_ospfv3, options_string); break; default: break; } } static void dissect_ospf_v3_prefix_options(tvbuff_t *tvb, int offset, proto_tree *tree) { guint8 prefix_options; char prefix_options_string[11]; guint8 position; position=0; prefix_options=tvb_get_guint8(tvb, offset); strcpy(prefix_options_string,""); if (prefix_options & OSPF_V3_PREFIX_OPTION_P) { strcat(prefix_options_string, "P"); position++; } if (prefix_options & OSPF_V3_PREFIX_OPTION_MC) { if ( (position > 0) && (prefix_options_string[position-1] != '/') ) { strcat(prefix_options_string, "/"); position++; } strcat(prefix_options_string, "MC"); position+=2; } if (prefix_options & OSPF_V3_PREFIX_OPTION_LA) { if ( (position > 0) && (prefix_options_string[position-1] != '/') ) { strcat(prefix_options_string, "/"); position++; } strcat(prefix_options_string, "LA"); position+=2; } if (prefix_options & OSPF_V3_PREFIX_OPTION_NU) { if ( (position > 0) && (prefix_options_string[position-1] != '/') ) { strcat(prefix_options_string, "/"); position++; } strcat(prefix_options_string, "NU"); } prefix_options_string[10]=0; proto_tree_add_text(tree, tvb, offset, 1, "PrefixOptions: 0x%02x (%s)",prefix_options, prefix_options_string); } static void dissect_ospf_v3_address_prefix(tvbuff_t *tvb, int offset, int prefix_length, proto_tree *tree) { guint8 value; guint8 position; guint8 bufpos; gchar buffer[32+7]; gchar bytebuf[3]; guint8 bytes_to_process; int start_offset; start_offset=offset; position=0; bufpos=0; bytes_to_process=((prefix_length+31)/32)*4; while (bytes_to_process > 0 ) { value=tvb_get_guint8(tvb, offset); if ( (position > 0) && ( (position%2) == 0 ) ) buffer[bufpos++]=':'; sprintf(bytebuf,"%02x",value); buffer[bufpos++]=bytebuf[0]; buffer[bufpos++]=bytebuf[1]; position++; offset++; bytes_to_process--; } buffer[bufpos]=0; proto_tree_add_text(tree, tvb, start_offset, ((prefix_length+31)/32)*4, "Address Prefix: %s",buffer); } void proto_register_ospf(void) { static gint *ett[] = { &ett_ospf, &ett_ospf_hdr, &ett_ospf_hello, &ett_ospf_desc, &ett_ospf_lsr, &ett_ospf_lsa, &ett_ospf_lsa_upd, &ett_ospf_lsa_mpls, &ett_ospf_lsa_mpls_router, &ett_ospf_lsa_mpls_link, &ett_ospf_lsa_mpls_link_stlv }; proto_ospf = proto_register_protocol("Open Shortest Path First", "OSPF", "ospf"); proto_register_field_array(proto_ospf, ospff_info, array_length(ospff_info)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_ospf(void) { dissector_handle_t ospf_handle; ospf_handle = create_dissector_handle(dissect_ospf, proto_ospf); dissector_add("ip.proto", IP_PROTO_OSPF, ospf_handle); data_handle = find_dissector("data"); }