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wireshark/packet-ospf.c

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/* packet-ospf.c
* Routines for OSPF packet disassembly
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
*
* $Id: packet-ospf.c,v 1.7 1998/10/20 05:31:01 guy 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.
*
* TOS - support is not fully implemented
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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 <gtk/gtk.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include "ethereal.h"
#include "packet.h"
#include "packet-ospf.h"
void
dissect_ospf(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospfhdr ospfh;
GtkWidget *ospf_tree = NULL, *ti;
GtkWidget *ospf_header_tree;
char auth_data[9]="";
char *packet_type;
static 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 } };
memcpy(&ospfh, &pd[offset], sizeof(e_ospfhdr));
packet_type = match_strval(ospfh.packet_type, pt_vals);
if (fd->win_info[COL_NUM]) {
strcpy(fd->win_info[COL_PROTOCOL], "OSPF");
if (packet_type != NULL)
sprintf(fd->win_info[COL_INFO], "%s", packet_type);
else
sprintf(fd->win_info[COL_INFO], "Unknown (%d)", ospfh.packet_type);
}
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, ntohs(ospfh.length), "Open Shortest Path First");
ospf_tree = gtk_tree_new();
add_subtree(ti, ospf_tree, ETT_OSPF);
ti = add_item_to_tree(GTK_WIDGET(ospf_tree), offset, OSPF_HEADER_LENGTH, "OSPF Header");
ospf_header_tree = gtk_tree_new();
add_subtree(ti, ospf_header_tree, ETT_OSPF_HDR);
add_item_to_tree(ospf_header_tree, offset, 1, "OSPF Version: %d", ospfh.version);
add_item_to_tree(ospf_header_tree, offset + 1 , 1, "OSPF Packet Type: %d (%s)",
ospfh.packet_type,
(packet_type != NULL ?
packet_type :
"Unknown"));
add_item_to_tree(ospf_header_tree, offset + 2 , 2, "Packet Legth: %d",
ntohs(ospfh.length));
add_item_to_tree(ospf_header_tree, offset + 4 , 4, "Source OSPF Router ID: %s",
ip_to_str((guint8 *) &(ospfh.routerid)));
if (!(ospfh.area)) {
add_item_to_tree(ospf_header_tree, offset + 8 , 4, "Area ID: Backbone");
} else {
add_item_to_tree(ospf_header_tree, offset + 8 , 4, "Area ID: %s", ip_to_str((guint8 *) &(ospfh.area)));
}
add_item_to_tree(ospf_header_tree, offset + 12 , 2, "Packet Checksum");
switch( ntohs(ospfh.auth_type) ) {
case OSPF_AUTH_NONE:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: none");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (none)");
break;
case OSPF_AUTH_SIMPLE:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: simple");
strncpy(auth_data, (char *) &ospfh.auth_data, 8);
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data: %s", auth_data);
break;
case OSPF_AUTH_CRYPT:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: crypt");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (crypt)");
break;
default:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type (unknown)");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (unknown)");
}
}
/* Skip over header */
offset += OSPF_HEADER_LENGTH;
switch(ospfh.packet_type){
case OSPF_HELLO:
dissect_ospf_hello(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_DB_DESC:
dissect_ospf_db_desc(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_REQ:
dissect_ospf_ls_req(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_UPD:
dissect_ospf_ls_upd(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_ACK:
dissect_ospf_ls_ack(pd, offset, fd, (GtkTree *) ospf_tree);
break;
default:
dissect_data(pd, offset, fd, tree);
}
}
void
dissect_ospf_hello(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_hello ospfhello;
guint32 *ospfneighbor;
char options[20]="";
int options_offset;
GtkWidget *ospf_hello_tree, *ti;
memcpy(&ospfhello, &pd[offset], sizeof(e_ospf_hello));
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "OSPF Hello Packet");
ospf_hello_tree = gtk_tree_new();
add_subtree(ti, ospf_hello_tree, ETT_OSPF_HELLO);
add_item_to_tree(ospf_hello_tree, offset , 4, "Network Mask: %s", ip_to_str((guint8 *) &ospfhello.network_mask));
add_item_to_tree(ospf_hello_tree, offset + 4, 2, "Hello Intervall: %d seconds", ntohs(ospfhello.hellointervall));
/* ATTENTION !!! no check for length of options string */
options_offset=0;
if(( ospfhello.options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
strcpy( (char *)(options + options_offset), "E");
options_offset+=1;
}
if(( ospfhello.options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
strcpy((char *) (options + options_offset), "/MC");
options_offset+=3;
}
if(( ospfhello.options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
strcpy((char *) (options + options_offset), "/NP");
options_offset+=3;
}
if(( ospfhello.options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
strcpy((char *) (options + options_offset) , "/EA");
options_offset+=3;
}
if(( ospfhello.options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
strcpy((char *) (options + options_offset) , "/DC");
options_offset+=3;
}
add_item_to_tree(ospf_hello_tree, offset + 6, 1, "Options: %d (%s)", ospfhello.options, options);
add_item_to_tree(ospf_hello_tree, offset + 7, 1, "Router Priority: %d", ospfhello.priority);
add_item_to_tree(ospf_hello_tree, offset + 8, 4, "RouterDeadIntervall: %ld seconds", (long)ntohl(ospfhello.dead_interval));
add_item_to_tree(ospf_hello_tree, offset + 12, 4, "Designated Router: %s", ip_to_str((guint8 *) &ospfhello.drouter));
add_item_to_tree(ospf_hello_tree, offset + 16, 4, "Backup Designated Router: %s", ip_to_str((guint8 *) &ospfhello.bdrouter));
offset+=20;
while(((int)(fd->cap_len - offset)) >= 4){
printf("%d", fd->cap_len - offset);
ospfneighbor=(guint32 *) &pd[offset];
add_item_to_tree(ospf_hello_tree, offset, 4, "Active Neighbor: %s", ip_to_str((guint8 *) ospfneighbor));
offset+=4;
}
}
}
void
dissect_ospf_db_desc(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_dbd ospf_dbd;
char options[20]="";
int options_offset;
char flags[20]="";
int flags_offset;
GtkWidget *ospf_db_desc_tree=NULL, *ti;
memcpy(&ospf_dbd, &pd[offset], sizeof(e_ospf_dbd));
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "OSPF DB Description");
ospf_db_desc_tree = gtk_tree_new();
add_subtree(ti, ospf_db_desc_tree, ETT_OSPF_DESC);
add_item_to_tree(ospf_db_desc_tree, offset, 2, "Interface MTU: %d", ntohs(ospf_dbd.interface_mtu) );
options_offset=0;
if(( ospf_dbd.options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
strcpy( (char *)(options + options_offset), "_E_");
options_offset+=1;
}
if(( ospf_dbd.options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
strcpy((char *) (options + options_offset), "_MC_");
options_offset+=3;
}
if(( ospf_dbd.options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
strcpy((char *) (options + options_offset), "_NP_");
options_offset+=3;
}
if(( ospf_dbd.options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
strcpy((char *) (options + options_offset) , "_EA_");
options_offset+=3;
}
if(( ospf_dbd.options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
strcpy((char *) (options + options_offset) , "_DC_");
options_offset+=3;
}
add_item_to_tree(ospf_db_desc_tree, offset + 2 , 1, "Options: %d (%s)", ospf_dbd.options, options );
flags_offset=0;
if(( ospf_dbd.flags & OSPF_DBD_FLAG_MS ) == OSPF_DBD_FLAG_MS){
strcpy( (char *)(flags + flags_offset), "_I_");
flags_offset+=1;
}
if(( ospf_dbd.flags & OSPF_DBD_FLAG_M ) == OSPF_DBD_FLAG_M){
strcpy((char *) (flags + flags_offset), "_M_");
flags_offset+=3;
}
if(( ospf_dbd.flags & OSPF_DBD_FLAG_I ) == OSPF_DBD_FLAG_I){
strcpy((char *) (flags + flags_offset), "_I_");
flags_offset+=3;
}
add_item_to_tree(ospf_db_desc_tree, offset + 3 , 1, "Flags: %d (%s)", ospf_dbd.flags, flags );
add_item_to_tree(ospf_db_desc_tree, offset + 4 , 4, "DD Sequence: %ld", (long)ntohl(ospf_dbd.dd_sequence) );
}
/* LS Headers will be processed here */
/* skip to the end of DB-Desc header */
offset+=8;
while( ((int) (fd->cap_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
dissect_ospf_lsa(pd, offset, fd, (GtkTree *) tree, FALSE);
offset+=OSPF_LSA_HEADER_LENGTH;
}
}
void
dissect_ospf_ls_req(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_ls_req ospf_lsr;
GtkWidget *ospf_lsr_tree, *ti;
/* zero or more LS requests may be within a LS Request */
/* we place every request for a LSA in a single subtree */
if (tree) {
while( ((int) ( fd->cap_len - offset)) >= OSPF_LS_REQ_LENGTH ){
memcpy(&ospf_lsr, &pd[offset], sizeof(e_ospf_ls_req));
ti = add_item_to_tree(GTK_WIDGET(tree), offset, OSPF_LS_REQ_LENGTH, "Link State Request");
ospf_lsr_tree = gtk_tree_new();
add_subtree(ti, ospf_lsr_tree, ETT_OSPF_LSR);
switch( ntohl( ospf_lsr.ls_type ) ){
case OSPF_LSTYPE_ROUTER:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Router-LSA (%ld)",
(long)ntohl( ospf_lsr.ls_type ) );
break;
case OSPF_LSTYPE_NETWORK:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Network-LSA (%ld)",
(long)ntohl( ospf_lsr.ls_type ) );
break;
case OSPF_LSTYPE_SUMMERY:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (IP network) (%ld)",
(long)ntohl( ospf_lsr.ls_type ) );
break;
case OSPF_LSTYPE_ASBR:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (ASBR) (%ld)",
(long)ntohl( ospf_lsr.ls_type ) );
break;
case OSPF_LSTYPE_ASEXT:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: AS-External-LSA (ASBR) (%ld)",
(long)ntohl( ospf_lsr.ls_type ) );
break;
default:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: %ld (unknown)",
(long)ntohl( ospf_lsr.ls_type ) );
}
add_item_to_tree(ospf_lsr_tree, offset + 4, 4, "Link State ID : %s",
ip_to_str((guint8 *) &(ospf_lsr.ls_id)));
add_item_to_tree(ospf_lsr_tree, offset + 8, 4, "Advertising Router : %s",
ip_to_str((guint8 *) &(ospf_lsr.adv_router)));
offset+=12;
}
}
}
void
dissect_ospf_ls_upd(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_lsa_upd_hdr upd_hdr;
guint32 lsa_counter;
GtkWidget *ospf_lsa_upd_tree=NULL, *ti;
memcpy(&upd_hdr, &pd[offset], sizeof(e_ospf_lsa_upd_hdr));
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "LS Update Packet");
ospf_lsa_upd_tree = gtk_tree_new();
add_subtree(ti, ospf_lsa_upd_tree, ETT_OSPF_LSA_UPD);
add_item_to_tree(ospf_lsa_upd_tree, offset, 4, "Nr oF LSAs: %ld", (long)ntohl(upd_hdr.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 < ntohl(upd_hdr.lsa_nr)){
offset+=dissect_ospf_lsa(pd, offset, fd, (GtkTree *) ospf_lsa_upd_tree, TRUE);
lsa_counter += 1;
}
}
void
dissect_ospf_ls_ack(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
/* the body of a LS Ack packet simply contains zero or more LSA Headers */
while( ((int)(fd->cap_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
dissect_ospf_lsa(pd, offset, fd, (GtkTree *) tree, FALSE);
offset+=OSPF_LSA_HEADER_LENGTH;
}
}
int
dissect_ospf_lsa(const u_char *pd, int offset, frame_data *fd, GtkTree *tree, int disassemble_body) {
e_ospf_lsa_hdr lsa_hdr;
char *lsa_type;
/* data strutures for the router LSA */
e_ospf_router_lsa router_lsa;
e_ospf_router_data router_data;
e_ospf_router_metric tos_data;
guint16 link_counter;
guint8 tos_counter;
char *link_type;
char *link_id;
/* data structures for the network lsa */
e_ospf_network_lsa network_lsa;
guint32 *attached_router;
/* data structures for the summary and ASBR LSAs */
e_ospf_summary_lsa summary_lsa;
/* data structures for the AS-External LSA */
e_ospf_asexternal_lsa asext_lsa;
guint32 asext_metric;
GtkWidget *ospf_lsa_tree, *ti;
memcpy(&lsa_hdr, &pd[offset], sizeof(e_ospf_lsa_hdr));
switch(lsa_hdr.ls_type) {
case OSPF_LSTYPE_ROUTER:
lsa_type="Router LSA";
break;
case OSPF_LSTYPE_NETWORK:
lsa_type="Network LSA";
break;
case OSPF_LSTYPE_SUMMERY:
lsa_type="Summery LSA";
break;
case OSPF_LSTYPE_ASBR:
lsa_type="ASBR LSA";
break;
case OSPF_LSTYPE_ASEXT:
lsa_type="AS-external-LSA";
break;
default:
lsa_type="unknown";
}
if (tree) {
if(disassemble_body){
ti = add_item_to_tree(GTK_WIDGET(tree), offset, ntohs(lsa_hdr.length),
"%s (Type: %d)", lsa_type, lsa_hdr.ls_type);
} else {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, OSPF_LSA_HEADER_LENGTH, "LSA Header");
}
ospf_lsa_tree = gtk_tree_new();
add_subtree(ti, ospf_lsa_tree, ETT_OSPF_LSA);
add_item_to_tree(ospf_lsa_tree, offset, 2, "LS Age: %d seconds", ntohs(lsa_hdr.ls_age));
add_item_to_tree(ospf_lsa_tree, offset + 2, 1, "Options: %d ", lsa_hdr.options);
add_item_to_tree(ospf_lsa_tree, offset + 3, 1, "LSA Type: %d (%s)", lsa_hdr.ls_type, lsa_type);
add_item_to_tree(ospf_lsa_tree, offset + 4, 4, "Linke State ID: %s ",
ip_to_str((guint8 *) &(lsa_hdr.ls_id)));
add_item_to_tree(ospf_lsa_tree, offset + 8, 4, "Advertising Router: %s ",
ip_to_str((guint8 *) &(lsa_hdr.adv_router)));
add_item_to_tree(ospf_lsa_tree, offset + 12, 4, "LS Sequence Number: 0x%04lx ",
(unsigned long)ntohl(lsa_hdr.ls_seq));
add_item_to_tree(ospf_lsa_tree, offset + 16, 2, "LS Checksum: %d ", ntohs(lsa_hdr.ls_checksum));
add_item_to_tree(ospf_lsa_tree, offset + 18, 2, "Length: %d ", ntohs(lsa_hdr.length));
if(!disassemble_body){
return OSPF_LSA_HEADER_LENGTH;
}
/* the LSA body starts afte 20 bytes of LSA Header */
offset+=20;
switch(lsa_hdr.ls_type){
case(OSPF_LSTYPE_ROUTER):
memcpy(&router_lsa, &pd[offset], sizeof(e_ospf_router_lsa));
/* again: flags should be secified in detail */
add_item_to_tree(ospf_lsa_tree, offset, 1, "Flags: 0x%02x ", router_lsa.flags);
add_item_to_tree(ospf_lsa_tree, offset + 2, 2, "Nr. of Links: %d ",
ntohs(router_lsa.nr_links));
offset += 4;
/* router_lsa.nr_links links follow
* maybe we should put each of the links into its own subtree ???
*/
for(link_counter = 1 ; link_counter <= ntohs(router_lsa.nr_links); link_counter++){
memcpy(&router_data, &pd[offset], sizeof(e_ospf_router_data));
/* check the Link Type and ID */
switch(router_data.link_type) {
case OSPF_LINK_PTP:
link_type="Point-to-point connection to another router";
link_id="Neighboring router's Router ID";
break;
case OSPF_LINK_TRANSIT:
link_type="Connection to a transit network";
link_id="IP address of Designated Router";
break;
case OSPF_LINK_STUB:
link_type="Connection to a stub network";
link_id="IP network/subnet number";
break;
case OSPF_LINK_VIRTUAL:
link_type="Virtual link";
link_id="Neighboring router's Router ID";
break;
default:
link_type="unknown link type";
link_id="unknown link id";
}
add_item_to_tree(ospf_lsa_tree, offset, 4, "%s: %s", link_id,
ip_to_str((guint8 *) &(router_data.link_id)));
/* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
add_item_to_tree(ospf_lsa_tree, offset + 4, 4, "Link Data: %s",
ip_to_str((guint8 *) &(router_data.link_data)));
add_item_to_tree(ospf_lsa_tree, offset + 8, 1, "Link Type: %d - %s",
router_data.link_type, link_type);
add_item_to_tree(ospf_lsa_tree, offset + 9, 1, "Nr. of TOS metrics: %d", router_data.nr_tos);
add_item_to_tree(ospf_lsa_tree, offset + 10, 2, "TOS 0 metric: %d", ntohs( router_data.tos0_metric ));
offset += 12;
/* router_data.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 ; link_counter <= ntohs(router_data.nr_tos); tos_counter++){
memcpy(&tos_data, &pd[offset], sizeof(e_ospf_router_metric));
add_item_to_tree(ospf_lsa_tree, offset, 1, "TOS: %d, Metric: %d",
tos_data.tos, ntohs(tos_data.metric));
offset += 4;
}
}
break;
case(OSPF_LSTYPE_NETWORK):
memcpy(&network_lsa, &pd[offset], sizeof(e_ospf_network_lsa));
add_item_to_tree(ospf_lsa_tree, offset, 4, "Netmask: %s",
ip_to_str((guint8 *) &(network_lsa.network_mask)));
offset += 4;
while( ((int) (fd->cap_len - offset)) >= 4){
attached_router = (guint32 *) &pd[offset];
add_item_to_tree(ospf_lsa_tree, offset, 4, "Attached Router: %s",
ip_to_str((guint8 *) attached_router));
offset += 4;
}
break;
case(OSPF_LSTYPE_SUMMERY):
/* Type 3 and 4 LSAs have the same format */
case(OSPF_LSTYPE_ASBR):
memcpy(&summary_lsa, &pd[offset], sizeof(e_ospf_summary_lsa));
add_item_to_tree(ospf_lsa_tree, offset, 4, "Netmask: %s",
ip_to_str((guint8 *) &(summary_lsa.network_mask)));
/* returns only the TOS 0 metric (even if there are more TOS metrics) */
break;
case(OSPF_LSTYPE_ASEXT):
memcpy(&summary_lsa, &pd[offset], sizeof(e_ospf_summary_lsa));
add_item_to_tree(ospf_lsa_tree, offset, 4, "Netmask: %s",
ip_to_str((guint8 *) &(summary_lsa.network_mask)));
/* asext_lsa = (e_ospf_asexternal_lsa *) &pd[offset + 4]; */
memcpy(&asext_lsa, &pd[offset + 4], sizeof(asext_lsa));
if( (asext_lsa.options & 128) == 128 ) { /* check wether or not E bit is set */
add_item_to_tree(ospf_lsa_tree, offset, 1,
"External Type: Type 2 (metric is larger than any other link state path)");
} else {
add_item_to_tree(ospf_lsa_tree, offset + 4, 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 -> not well aligned */
/* this routine returns only the TOS 0 metric (even if there are more TOS metrics) */
memcpy(&asext_metric, &pd[offset+4], 4);
/* erase the leading 8 bits (the dont belong to the metric */
asext_metric = ntohl(asext_metric) & 0x00ffffff ;
add_item_to_tree(ospf_lsa_tree, offset + 5, 3,"Metric: %d", asext_metric);
add_item_to_tree(ospf_lsa_tree, offset + 8, 4,"Forwarding Address: %s",
ip_to_str((guint8 *) &(asext_lsa.gateway)));
add_item_to_tree(ospf_lsa_tree, offset + 12, 4,"External Route Tag: %ld", (long)ntohl(asext_lsa.external_tag));
break;
default:
/* unknown LSA type */
add_item_to_tree(ospf_lsa_tree, offset, (fd->cap_len - offset), "Unknown LSA Type");
}
}
/* return the length of this LSA */
return ntohs(lsa_hdr.length);
}
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