![Guy Harris](/assets/img/avatar_default.png)
does not stop dissecting the LSA until it hits the end of the packet, from Heikki Vatiainen. svn path=/trunk/; revision=1049
632 lines
24 KiB
C
632 lines
24 KiB
C
/* packet-ospf.c
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* Routines for OSPF packet disassembly
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* $Id: packet-ospf.c,v 1.17 1999/11/17 19:07:10 guy Exp $
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*
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* At this time, this module is able to analyze OSPF
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* packets as specified in RFC2328. MOSPF (RFC1584) and other
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* OSPF Extensions which introduce new Packet types
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* (e.g the External Atributes LSA) are not supported.
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*
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* TOS - support is not fully implemented
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-ospf.h"
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static int proto_ospf = -1;
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static gint ett_ospf = -1;
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static gint ett_ospf_hdr = -1;
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static gint ett_ospf_hello = -1;
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static gint ett_ospf_desc = -1;
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static gint ett_ospf_lsr = -1;
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static gint ett_ospf_lsa = -1;
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static gint ett_ospf_lsa_upd = -1;
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void
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dissect_ospf(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_ospfhdr ospfh;
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e_ospf_crypto *crypto;
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int i, saved_len, ospflen;
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proto_tree *ospf_tree = NULL;
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proto_item *ti;
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proto_tree *ospf_header_tree;
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char auth_data[(2 * 16) + 1]="";
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char *packet_type;
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static value_string pt_vals[] = { {OSPF_HELLO, "Hello Packet" },
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{OSPF_DB_DESC, "DB Descr." },
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{OSPF_LS_REQ, "LS Request" },
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{OSPF_LS_UPD, "LS Update" },
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{OSPF_LS_ACK, "LS Acknowledge" },
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{0, NULL } };
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memcpy(&ospfh, &pd[offset], sizeof(e_ospfhdr));
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packet_type = match_strval(ospfh.packet_type, pt_vals);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "OSPF");
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if (check_col(fd, COL_INFO)) {
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if (packet_type != NULL)
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col_add_str(fd, COL_INFO, packet_type);
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else
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col_add_fstr(fd, COL_INFO, "Unknown (%d)", ospfh.packet_type);
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ospf, offset, ntohs(ospfh.length), NULL);
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ospf_tree = proto_item_add_subtree(ti, ett_ospf);
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ti = proto_tree_add_text(ospf_tree, offset, OSPF_HEADER_LENGTH, "OSPF Header");
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ospf_header_tree = proto_item_add_subtree(ti, ett_ospf_hdr);
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proto_tree_add_text(ospf_header_tree, offset, 1, "OSPF Version: %d", ospfh.version);
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proto_tree_add_text(ospf_header_tree, offset + 1 , 1, "OSPF Packet Type: %d (%s)",
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ospfh.packet_type,
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(packet_type != NULL ?
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packet_type :
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"Unknown"));
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proto_tree_add_text(ospf_header_tree, offset + 2 , 2, "Packet Length: %d",
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ntohs(ospfh.length));
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proto_tree_add_text(ospf_header_tree, offset + 4 , 4, "Source OSPF Router ID: %s",
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ip_to_str((guint8 *) &(ospfh.routerid)));
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if (!(ospfh.area)) {
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proto_tree_add_text(ospf_header_tree, offset + 8 , 4, "Area ID: Backbone");
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} else {
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proto_tree_add_text(ospf_header_tree, offset + 8 , 4, "Area ID: %s", ip_to_str((guint8 *) &(ospfh.area)));
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}
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proto_tree_add_text(ospf_header_tree, offset + 12 , 2, "Packet Checksum: 0x%x",
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ntohs(ospfh.checksum));
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switch( ntohs(ospfh.auth_type) ) {
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case OSPF_AUTH_NONE:
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proto_tree_add_text(ospf_header_tree, offset + 14 , 2, "Auth Type: none");
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proto_tree_add_text(ospf_header_tree, offset + 16 , 8, "Auth Data (none)");
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break;
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case OSPF_AUTH_SIMPLE:
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proto_tree_add_text(ospf_header_tree, offset + 14 , 2, "Auth Type: simple");
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strncpy(auth_data, (char *) &ospfh.auth_data, 8);
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proto_tree_add_text(ospf_header_tree, offset + 16 , 8, "Auth Data: %s", auth_data);
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break;
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case OSPF_AUTH_CRYPT:
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crypto = (e_ospf_crypto *)ospfh.auth_data;
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proto_tree_add_text(ospf_header_tree, offset + 14 , 2, "Auth Type: crypt");
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proto_tree_add_text(ospf_header_tree, offset + 18 , 1, "Auth Key ID: %d",
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crypto->key_id);
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proto_tree_add_text(ospf_header_tree, offset + 19 , 1, "Auth Data Length: %d",
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crypto->length);
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proto_tree_add_text(ospf_header_tree, offset + 20 , 4, "Auth Crypto Sequence Number: 0x%x",
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ntohl(crypto->sequence_num));
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ospflen = ntohs(ospfh.length);
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for (i = 0; i < crypto->length && i < (sizeof(auth_data)/2); i++)
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sprintf(&auth_data[i*2],"%02x",pd[offset + ospflen + i]);
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proto_tree_add_text(ospf_header_tree, offset + ospflen , 16, "Auth Data: %s", auth_data);
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break;
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default:
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proto_tree_add_text(ospf_header_tree, offset + 14 , 2, "Auth Type (unknown)");
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proto_tree_add_text(ospf_header_tree, offset + 16 , 8, "Auth Data (unknown)");
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}
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}
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/* Temporarily adjust the captured length to match the size of the OSPF
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* packet (since the dissect routines use it to work out where the end of
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* the ospf packet is).
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*/
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saved_len = pi.captured_len;
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if (BYTES_ARE_IN_FRAME(offset, ntohs(ospfh.length))) {
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pi.captured_len = offset + ntohs(ospfh.length);
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}
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/* Skip over header */
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offset += OSPF_HEADER_LENGTH;
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switch(ospfh.packet_type){
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case OSPF_HELLO:
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dissect_ospf_hello(pd, offset, fd, ospf_tree);
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break;
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case OSPF_DB_DESC:
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dissect_ospf_db_desc(pd, offset, fd, ospf_tree);
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break;
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case OSPF_LS_REQ:
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dissect_ospf_ls_req(pd, offset, fd, ospf_tree);
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break;
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case OSPF_LS_UPD:
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dissect_ospf_ls_upd(pd, offset, fd, ospf_tree);
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break;
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case OSPF_LS_ACK:
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dissect_ospf_ls_ack(pd, offset, fd, ospf_tree);
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break;
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default:
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pi.captured_len = saved_len;
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dissect_data(pd, offset, fd, tree);
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}
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pi.captured_len = saved_len;
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}
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void
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dissect_ospf_hello(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_ospf_hello ospfhello;
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guint32 *ospfneighbor;
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char options[20]="";
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int options_offset;
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proto_tree *ospf_hello_tree;
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proto_item *ti;
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memcpy(&ospfhello, &pd[offset], sizeof(e_ospf_hello));
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if (tree) {
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ti = proto_tree_add_text(tree, offset, END_OF_FRAME, "OSPF Hello Packet");
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ospf_hello_tree = proto_item_add_subtree(ti, ett_ospf_hello);
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proto_tree_add_text(ospf_hello_tree, offset , 4, "Network Mask: %s", ip_to_str((guint8 *) &ospfhello.network_mask));
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proto_tree_add_text(ospf_hello_tree, offset + 4, 2, "Hello Interval: %d seconds", ntohs(ospfhello.hellointervall));
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/* ATTENTION !!! no check for length of options string */
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options_offset=0;
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if(( ospfhello.options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
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strcpy( (char *)(options + options_offset), "E");
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options_offset+=1;
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}
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if(( ospfhello.options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
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strcpy((char *) (options + options_offset), "/MC");
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options_offset+=3;
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}
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if(( ospfhello.options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
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strcpy((char *) (options + options_offset), "/NP");
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options_offset+=3;
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}
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if(( ospfhello.options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
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strcpy((char *) (options + options_offset) , "/EA");
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options_offset+=3;
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}
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if(( ospfhello.options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
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strcpy((char *) (options + options_offset) , "/DC");
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options_offset+=3;
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}
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proto_tree_add_text(ospf_hello_tree, offset + 6, 1, "Options: %d (%s)", ospfhello.options, options);
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proto_tree_add_text(ospf_hello_tree, offset + 7, 1, "Router Priority: %d", ospfhello.priority);
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proto_tree_add_text(ospf_hello_tree, offset + 8, 4, "Router Dead Interval: %ld seconds", (long)ntohl(ospfhello.dead_interval));
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proto_tree_add_text(ospf_hello_tree, offset + 12, 4, "Designated Router: %s", ip_to_str((guint8 *) &ospfhello.drouter));
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proto_tree_add_text(ospf_hello_tree, offset + 16, 4, "Backup Designated Router: %s", ip_to_str((guint8 *) &ospfhello.bdrouter));
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offset+=20;
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while(((int)(pi.captured_len - offset)) >= 4){
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ospfneighbor=(guint32 *) &pd[offset];
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proto_tree_add_text(ospf_hello_tree, offset, 4, "Active Neighbor: %s", ip_to_str((guint8 *) ospfneighbor));
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offset+=4;
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}
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}
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}
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void
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dissect_ospf_db_desc(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_ospf_dbd ospf_dbd;
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char options[20]="";
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int options_offset;
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char flags[20]="";
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int flags_offset;
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proto_tree *ospf_db_desc_tree=NULL;
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proto_item *ti;
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memcpy(&ospf_dbd, &pd[offset], sizeof(e_ospf_dbd));
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if (tree) {
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ti = proto_tree_add_text(tree, offset, END_OF_FRAME, "OSPF DB Description");
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ospf_db_desc_tree = proto_item_add_subtree(ti, ett_ospf_desc);
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proto_tree_add_text(ospf_db_desc_tree, offset, 2, "Interface MTU: %d", ntohs(ospf_dbd.interface_mtu) );
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options_offset=0;
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if(( ospf_dbd.options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
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strcpy( (char *)(options + options_offset), "_E_");
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options_offset+=1;
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}
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if(( ospf_dbd.options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
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strcpy((char *) (options + options_offset), "_MC_");
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options_offset+=3;
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}
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if(( ospf_dbd.options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
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strcpy((char *) (options + options_offset), "_NP_");
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options_offset+=3;
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}
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if(( ospf_dbd.options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
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strcpy((char *) (options + options_offset) , "_EA_");
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options_offset+=3;
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}
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if(( ospf_dbd.options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
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strcpy((char *) (options + options_offset) , "_DC_");
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options_offset+=3;
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}
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proto_tree_add_text(ospf_db_desc_tree, offset + 2 , 1, "Options: %d (%s)", ospf_dbd.options, options );
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flags_offset=0;
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if(( ospf_dbd.flags & OSPF_DBD_FLAG_MS ) == OSPF_DBD_FLAG_MS){
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strcpy( (char *)(flags + flags_offset), "_I_");
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flags_offset+=1;
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}
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if(( ospf_dbd.flags & OSPF_DBD_FLAG_M ) == OSPF_DBD_FLAG_M){
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strcpy((char *) (flags + flags_offset), "_M_");
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flags_offset+=3;
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}
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if(( ospf_dbd.flags & OSPF_DBD_FLAG_I ) == OSPF_DBD_FLAG_I){
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strcpy((char *) (flags + flags_offset), "_I_");
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flags_offset+=3;
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}
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proto_tree_add_text(ospf_db_desc_tree, offset + 3 , 1, "Flags: %d (%s)", ospf_dbd.flags, flags );
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proto_tree_add_text(ospf_db_desc_tree, offset + 4 , 4, "DD Sequence: %ld", (long)ntohl(ospf_dbd.dd_sequence) );
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}
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/* LS Headers will be processed here */
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/* skip to the end of DB-Desc header */
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offset+=8;
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while( ((int) (pi.captured_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
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dissect_ospf_lsa(pd, offset, fd, tree, FALSE);
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offset+=OSPF_LSA_HEADER_LENGTH;
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}
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}
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void
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dissect_ospf_ls_req(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_ospf_ls_req ospf_lsr;
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proto_tree *ospf_lsr_tree;
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proto_item *ti;
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/* zero or more LS requests may be within a LS Request */
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/* we place every request for a LSA in a single subtree */
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if (tree) {
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while( ((int) (pi.captured_len - offset)) >= OSPF_LS_REQ_LENGTH ){
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memcpy(&ospf_lsr, &pd[offset], sizeof(e_ospf_ls_req));
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ti = proto_tree_add_text(tree, offset, OSPF_LS_REQ_LENGTH, "Link State Request");
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ospf_lsr_tree = proto_item_add_subtree(ti, ett_ospf_lsr);
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switch( ntohl( ospf_lsr.ls_type ) ){
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case OSPF_LSTYPE_ROUTER:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: Router-LSA (%ld)",
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(long)ntohl( ospf_lsr.ls_type ) );
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break;
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case OSPF_LSTYPE_NETWORK:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: Network-LSA (%ld)",
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(long)ntohl( ospf_lsr.ls_type ) );
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break;
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case OSPF_LSTYPE_SUMMERY:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (IP network) (%ld)",
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(long)ntohl( ospf_lsr.ls_type ) );
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break;
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case OSPF_LSTYPE_ASBR:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (ASBR) (%ld)",
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(long)ntohl( ospf_lsr.ls_type ) );
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break;
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case OSPF_LSTYPE_ASEXT:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: AS-External-LSA (ASBR) (%ld)",
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(long)ntohl( ospf_lsr.ls_type ) );
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break;
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default:
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proto_tree_add_text(ospf_lsr_tree, offset, 4, "LS Type: %ld (unknown)",
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(long)ntohl( ospf_lsr.ls_type ) );
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}
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proto_tree_add_text(ospf_lsr_tree, offset + 4, 4, "Link State ID : %s",
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ip_to_str((guint8 *) &(ospf_lsr.ls_id)));
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proto_tree_add_text(ospf_lsr_tree, offset + 8, 4, "Advertising Router : %s",
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ip_to_str((guint8 *) &(ospf_lsr.adv_router)));
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offset+=12;
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}
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}
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}
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void
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dissect_ospf_ls_upd(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_ospf_lsa_upd_hdr upd_hdr;
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guint32 lsa_counter;
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proto_tree *ospf_lsa_upd_tree=NULL;
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proto_item *ti;
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memcpy(&upd_hdr, &pd[offset], sizeof(e_ospf_lsa_upd_hdr));
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if (tree) {
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ti = proto_tree_add_text(tree, offset, END_OF_FRAME, "LS Update Packet");
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ospf_lsa_upd_tree = proto_item_add_subtree(ti, ett_ospf_lsa_upd);
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proto_tree_add_text(ospf_lsa_upd_tree, offset, 4, "Nr oF LSAs: %ld", (long)ntohl(upd_hdr.lsa_nr) );
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}
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/* skip to the beginning of the first LSA */
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offset+=4; /* the LS Upd PAcket contains only a 32 bit #LSAs field */
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lsa_counter = 0;
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while(lsa_counter < ntohl(upd_hdr.lsa_nr)){
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offset+=dissect_ospf_lsa(pd, offset, fd, ospf_lsa_upd_tree, TRUE);
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lsa_counter += 1;
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}
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}
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void
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dissect_ospf_ls_ack(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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/* the body of a LS Ack packet simply contains zero or more LSA Headers */
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while( ((int)(pi.captured_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
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dissect_ospf_lsa(pd, offset, fd, tree, FALSE);
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offset+=OSPF_LSA_HEADER_LENGTH;
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}
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}
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int
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dissect_ospf_lsa(const u_char *pd, int offset, frame_data *fd, proto_tree *tree, int disassemble_body) {
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e_ospf_lsa_hdr lsa_hdr;
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char *lsa_type;
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int lsa_end;
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/* data strutures for the router LSA */
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e_ospf_router_lsa router_lsa;
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e_ospf_router_data router_data;
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e_ospf_router_metric tos_data;
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guint16 link_counter;
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guint8 tos_counter;
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char *link_type;
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char *link_id;
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/* data structures for the network lsa */
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e_ospf_network_lsa network_lsa;
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guint32 *attached_router;
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/* data structures for the summary and ASBR LSAs */
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e_ospf_summary_lsa summary_lsa;
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/* data structures for the AS-External LSA */
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e_ospf_asexternal_lsa asext_lsa;
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guint32 asext_metric;
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proto_tree *ospf_lsa_tree;
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proto_item *ti;
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memcpy(&lsa_hdr, &pd[offset], sizeof(e_ospf_lsa_hdr));
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switch(lsa_hdr.ls_type) {
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case OSPF_LSTYPE_ROUTER:
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lsa_type="Router LSA";
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break;
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case OSPF_LSTYPE_NETWORK:
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lsa_type="Network LSA";
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break;
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case OSPF_LSTYPE_SUMMERY:
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lsa_type="Summary LSA";
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break;
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case OSPF_LSTYPE_ASBR:
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lsa_type="ASBR LSA";
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break;
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case OSPF_LSTYPE_ASEXT:
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lsa_type="AS-external-LSA";
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break;
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default:
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lsa_type="unknown";
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}
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if (tree) {
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if(disassemble_body){
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ti = proto_tree_add_text(tree, offset, ntohs(lsa_hdr.length),
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"%s (Type: %d)", lsa_type, lsa_hdr.ls_type);
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} else {
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ti = proto_tree_add_text(tree, offset, OSPF_LSA_HEADER_LENGTH, "LSA Header");
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}
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ospf_lsa_tree = proto_item_add_subtree(ti, ett_ospf_lsa);
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proto_tree_add_text(ospf_lsa_tree, offset, 2, "LS Age: %d seconds", ntohs(lsa_hdr.ls_age));
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proto_tree_add_text(ospf_lsa_tree, offset + 2, 1, "Options: %d ", lsa_hdr.options);
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proto_tree_add_text(ospf_lsa_tree, offset + 3, 1, "LSA Type: %d (%s)", lsa_hdr.ls_type, lsa_type);
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proto_tree_add_text(ospf_lsa_tree, offset + 4, 4, "Linke State ID: %s ",
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ip_to_str((guint8 *) &(lsa_hdr.ls_id)));
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proto_tree_add_text(ospf_lsa_tree, offset + 8, 4, "Advertising Router: %s ",
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ip_to_str((guint8 *) &(lsa_hdr.adv_router)));
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proto_tree_add_text(ospf_lsa_tree, offset + 12, 4, "LS Sequence Number: 0x%04lx ",
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(unsigned long)ntohl(lsa_hdr.ls_seq));
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proto_tree_add_text(ospf_lsa_tree, offset + 16, 2, "LS Checksum: %d ", ntohs(lsa_hdr.ls_checksum));
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proto_tree_add_text(ospf_lsa_tree, offset + 18, 2, "Length: %d ", ntohs(lsa_hdr.length));
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if(!disassemble_body){
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return OSPF_LSA_HEADER_LENGTH;
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}
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lsa_end = offset + ntohs(lsa_hdr.length);
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/* the LSA body starts after 20 bytes of LSA Header */
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offset+=20;
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switch(lsa_hdr.ls_type){
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case(OSPF_LSTYPE_ROUTER):
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memcpy(&router_lsa, &pd[offset], sizeof(e_ospf_router_lsa));
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/* again: flags should be secified in detail */
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proto_tree_add_text(ospf_lsa_tree, offset, 1, "Flags: 0x%02x ", router_lsa.flags);
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proto_tree_add_text(ospf_lsa_tree, offset + 2, 2, "Nr. of Links: %d ",
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ntohs(router_lsa.nr_links));
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offset += 4;
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/* router_lsa.nr_links links follow
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* maybe we should put each of the links into its own subtree ???
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*/
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for(link_counter = 1 ; link_counter <= ntohs(router_lsa.nr_links); link_counter++){
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memcpy(&router_data, &pd[offset], sizeof(e_ospf_router_data));
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/* check the Link Type and ID */
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switch(router_data.link_type) {
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case OSPF_LINK_PTP:
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link_type="Point-to-point connection to another router";
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link_id="Neighboring router's Router ID";
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break;
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case OSPF_LINK_TRANSIT:
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link_type="Connection to a transit network";
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link_id="IP address of Designated Router";
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break;
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case OSPF_LINK_STUB:
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link_type="Connection to a stub network";
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link_id="IP network/subnet number";
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break;
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case OSPF_LINK_VIRTUAL:
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link_type="Virtual link";
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link_id="Neighboring router's Router ID";
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break;
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default:
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link_type="unknown link type";
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link_id="unknown link id";
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}
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proto_tree_add_text(ospf_lsa_tree, offset, 4, "%s: %s", link_id,
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ip_to_str((guint8 *) &(router_data.link_id)));
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/* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
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proto_tree_add_text(ospf_lsa_tree, offset + 4, 4, "Link Data: %s",
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ip_to_str((guint8 *) &(router_data.link_data)));
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proto_tree_add_text(ospf_lsa_tree, offset + 8, 1, "Link Type: %d - %s",
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router_data.link_type, link_type);
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proto_tree_add_text(ospf_lsa_tree, offset + 9, 1, "Nr. of TOS metrics: %d", router_data.nr_tos);
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proto_tree_add_text(ospf_lsa_tree, offset + 10, 2, "TOS 0 metric: %d", ntohs( router_data.tos0_metric ));
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offset += 12;
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/* router_data.nr_tos metrics may follow each link
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* ATTENTION: TOS metrics are not tested (I don't have TOS based routing)
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* please send me a mail if it is/isn't working
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*/
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for(tos_counter = 1 ; link_counter <= ntohs(router_data.nr_tos); tos_counter++){
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memcpy(&tos_data, &pd[offset], sizeof(e_ospf_router_metric));
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proto_tree_add_text(ospf_lsa_tree, offset, 1, "TOS: %d, Metric: %d",
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tos_data.tos, ntohs(tos_data.metric));
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offset += 4;
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}
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}
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break;
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case(OSPF_LSTYPE_NETWORK):
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memcpy(&network_lsa, &pd[offset], sizeof(e_ospf_network_lsa));
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proto_tree_add_text(ospf_lsa_tree, offset, 4, "Netmask: %s",
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ip_to_str((guint8 *) &(network_lsa.network_mask)));
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offset += 4;
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while( (lsa_end - offset) >= 4){
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attached_router = (guint32 *) &pd[offset];
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proto_tree_add_text(ospf_lsa_tree, offset, 4, "Attached Router: %s",
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ip_to_str((guint8 *) attached_router));
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offset += 4;
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}
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break;
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case(OSPF_LSTYPE_SUMMERY):
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/* Type 3 and 4 LSAs have the same format */
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case(OSPF_LSTYPE_ASBR):
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memcpy(&summary_lsa, &pd[offset], sizeof(e_ospf_summary_lsa));
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proto_tree_add_text(ospf_lsa_tree, offset, 4, "Netmask: %s",
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ip_to_str((guint8 *) &(summary_lsa.network_mask)));
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/* returns only the TOS 0 metric (even if there are more TOS metrics) */
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break;
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case(OSPF_LSTYPE_ASEXT):
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memcpy(&summary_lsa, &pd[offset], sizeof(e_ospf_summary_lsa));
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proto_tree_add_text(ospf_lsa_tree, offset, 4, "Netmask: %s",
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ip_to_str((guint8 *) &(summary_lsa.network_mask)));
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/* asext_lsa = (e_ospf_asexternal_lsa *) &pd[offset + 4]; */
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memcpy(&asext_lsa, &pd[offset + 4], sizeof(asext_lsa));
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if( (asext_lsa.options & 128) == 128 ) { /* check wether or not E bit is set */
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proto_tree_add_text(ospf_lsa_tree, offset, 1,
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"External Type: Type 2 (metric is larger than any other link state path)");
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} else {
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proto_tree_add_text(ospf_lsa_tree, offset + 4, 1,
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"External Type: Type 1 (metric is specified in the same units as interface cost)");
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}
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/* the metric field of a AS-external LAS is specified in 3 bytes -> not well aligned */
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/* this routine returns only the TOS 0 metric (even if there are more TOS metrics) */
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memcpy(&asext_metric, &pd[offset+4], 4);
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/* erase the leading 8 bits (the dont belong to the metric */
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asext_metric = ntohl(asext_metric) & 0x00ffffff ;
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proto_tree_add_text(ospf_lsa_tree, offset + 5, 3,"Metric: %d", asext_metric);
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proto_tree_add_text(ospf_lsa_tree, offset + 8, 4,"Forwarding Address: %s",
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ip_to_str((guint8 *) &(asext_lsa.gateway)));
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proto_tree_add_text(ospf_lsa_tree, offset + 12, 4,"External Route Tag: %ld", (long)ntohl(asext_lsa.external_tag));
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break;
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default:
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/* unknown LSA type */
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proto_tree_add_text(ospf_lsa_tree, offset, END_OF_FRAME, "Unknown LSA Type");
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}
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}
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/* return the length of this LSA */
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return ntohs(lsa_hdr.length);
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}
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void
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proto_register_ospf(void)
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{
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/* static hf_register_info hf[] = {
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{ &variable,
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{ "Name", "ospf.abbreviation", TYPE, VALS_POINTER }},
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};*/
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static gint *ett[] = {
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&ett_ospf,
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&ett_ospf_hdr,
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&ett_ospf_hello,
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&ett_ospf_desc,
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&ett_ospf_lsr,
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&ett_ospf_lsa,
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&ett_ospf_lsa_upd,
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};
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proto_ospf = proto_register_protocol("Open Shortest Path First", "ospf");
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/* proto_register_field_array(proto_ospf, hf, array_length(hf));*/
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proto_register_subtree_array(ett, array_length(ett));
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}
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