789 lines
17 KiB
C
789 lines
17 KiB
C
/*
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* Copyright (C) 1999 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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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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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-bgp.c,v 1.21 2000/12/05 05:48:35 guy Exp $";
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <netdb.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"
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struct bgp {
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u_int8_t bgp_marker[16];
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u_int16_t bgp_len;
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u_int8_t bgp_type;
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};
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#define BGP_SIZE 19 /* unaligned */
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#define BGP_OPEN 1
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#define BGP_UPDATE 2
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#define BGP_NOTIFICATION 3
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#define BGP_KEEPALIVE 4
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struct bgp_open {
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u_int8_t bgpo_marker[16];
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u_int16_t bgpo_len;
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u_int8_t bgpo_type;
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u_int8_t bgpo_version;
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u_int16_t bgpo_myas;
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u_int16_t bgpo_holdtime;
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u_int32_t bgpo_id;
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u_int8_t bgpo_optlen;
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/* options should follow */
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};
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struct bgp_opt {
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u_int8_t bgpopt_type;
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u_int8_t bgpopt_len;
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/* variable length */
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};
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struct bgp_notification {
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u_int8_t bgpn_marker[16];
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u_int16_t bgpn_len;
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u_int8_t bgpn_type;
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u_int8_t bgpn_major;
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u_int8_t bgpn_minor;
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/* data should follow */
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};
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struct bgp_attr {
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u_int8_t bgpa_flags;
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u_int8_t bgpa_type;
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union {
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u_int8_t len;
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u_int16_t elen;
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} bgpa_len;
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#define bgp_attr_len(p) \
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(((p)->bgpa_flags & 0x10) ? \
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ntohs((p)->bgpa_len.elen) : (p)->bgpa_len.len)
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#define bgp_attr_off(p) \
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(((p)->bgpa_flags & 0x10) ? 4 : 3)
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};
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#define BGPTYPE_ORIGIN 1
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#define BGPTYPE_AS_PATH 2
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#define BGPTYPE_NEXT_HOP 3
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#define BGPTYPE_MULTI_EXIT_DISC 4
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#define BGPTYPE_LOCAL_PREF 5
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#define BGPTYPE_ATOMIC_AGGREGATE 6
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#define BGPTYPE_AGGREGATOR 7
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#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
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#define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
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#define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
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#define BGPTYPE_DPA 11 /* work in progress */
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#define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
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#define BGPTYPE_RCID_PATH 13 /* RFC1863 */
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#define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
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#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
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static const char *bgptype[] = {
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NULL, "OPEN", "UPDATE", "NOTIFICATION", "KEEPALIVE",
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};
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#define bgp_type(x) num_or_str(bgptype, sizeof(bgptype)/sizeof(bgptype[0]), (x))
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static const char *bgpopt_type[] = {
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NULL, "Authentication Information",
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};
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#define bgp_opttype(x) \
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num_or_str(bgpopt_type, sizeof(bgpopt_type)/sizeof(bgpopt_type[0]), (x))
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static const char *bgpnotify_major[] = {
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NULL, "Message Header Error",
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"OPEN Message Error", "UPDATE Message Error",
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"Hold Timer Expired", "Finite State Machine Error",
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"Cease",
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};
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#define bgp_notify_major(x) \
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num_or_str(bgpnotify_major, \
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sizeof(bgpnotify_major)/sizeof(bgpnotify_major[0]), (x))
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static const char *bgpnotify_minor_1[] = {
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NULL, "Connection Not Synchronized",
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"Bad Message Length", "Bad Message Type",
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};
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static const char *bgpnotify_minor_2[] = {
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NULL, "Unsupported Version Number",
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"Bad Peer AS", "Bad BGP Identifier",
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"Unsupported Optional Parameter", "Authentication Failure",
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"Unacceptable Hold Time",
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};
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static const char *bgpnotify_minor_3[] = {
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NULL, "Malformed Attribute List",
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"Unrecognized Well-known Attribute", "Missing Well-known Attribute",
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"Attribute Flags Error", "Attribute Length Error",
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"Invalid ORIGIN Attribute", "AS Routing Loop",
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"Invalid NEXT_HOP Attribute", "Optional Attribute Error",
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"Invalid Network Field", "Malformed AS_PATH",
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};
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static const char **bgpnotify_minor[] = {
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NULL, bgpnotify_minor_1, bgpnotify_minor_2, bgpnotify_minor_3,
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};
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static const int bgpnotify_minor_siz[] = {
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0, sizeof(bgpnotify_minor_1)/sizeof(bgpnotify_minor_1[0]),
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sizeof(bgpnotify_minor_2)/sizeof(bgpnotify_minor_2[0]),
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sizeof(bgpnotify_minor_3)/sizeof(bgpnotify_minor_3[0]),
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};
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static const char *bgpattr_origin[] = {
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"IGP", "EGP", "INCOMPLETE",
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};
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#define bgp_attr_origin(x) \
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num_or_str(bgpattr_origin, \
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sizeof(bgpattr_origin)/sizeof(bgpattr_origin[0]), (x))
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static const char *bgpattr_type[] = {
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NULL, "ORIGIN", "AS_PATH", "NEXT_HOP",
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"MULTI_EXIT_DISC", "LOCAL_PREF", "ATOMIC_AGGREGATE", "AGGREGATOR",
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"COMMUNITIES", "ORIGINATOR_ID", "CLUSTER_LIST", "DPA",
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"ADVERTISERS", "RCID_PATH", "MP_REACH_NLRI", "MP_UNREACH_NLRI",
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};
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#define bgp_attr_type(x) \
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num_or_str(bgpattr_type, \
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sizeof(bgpattr_type)/sizeof(bgpattr_type[0]), (x))
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/* Subsequent address family identifier, RFC2283 section 7 */
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static const char *bgpattr_nlri_safi[] = {
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"Reserved", "Unicast", "Multicast", "Unicast+Multicast",
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};
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#define bgp_attr_nlri_safi(x) \
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num_or_str(bgpattr_nlri_safi, \
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sizeof(bgpattr_nlri_safi)/sizeof(bgpattr_nlri_safi[0]), (x))
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/* well-known community */
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#define BGP_COMMUNITY_NO_EXPORT 0xffffff01
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#define BGP_COMMUNITY_NO_ADVERT 0xffffff02
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#define BGP_COMMUNITY_NO_EXPORT_SUBCONFED 0xffffff03
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/* RFC1700 address family numbers */
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#define AFNUM_INET 1
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#define AFNUM_INET6 2
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#define AFNUM_NSAP 3
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#define AFNUM_HDLC 4
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#define AFNUM_BBN1822 5
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#define AFNUM_802 6
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#define AFNUM_E163 7
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#define AFNUM_E164 8
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#define AFNUM_F69 9
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#define AFNUM_X121 10
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#define AFNUM_IPX 11
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#define AFNUM_ATALK 12
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#define AFNUM_DECNET 13
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#define AFNUM_BANYAN 14
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#define AFNUM_E164NSAP 15
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static const char *afnumber[] = {
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"Reserved", "IPv4", "IPv6", "NSAP", "HDLC",
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"BBN 1822", "802", "E.163", "E.164", "F.69",
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"X.121", "IPX", "Appletalk", "Decnet IV", "Banyan Vines",
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"E.164 with NSAP subaddress",
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};
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#define af_name(x) \
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(((x) == 65535) ? afnumber[0] : \
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num_or_str(afnumber, \
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sizeof(afnumber)/sizeof(afnumber[0]), (x)))
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static const char *
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num_or_str(const char **table, size_t siz, int value)
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{
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static char buf[20];
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if (value < 0 || siz <= value || table[value] == NULL) {
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snprintf(buf, sizeof(buf), "#%d", value);
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return buf;
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} else
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return table[value];
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}
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static const char *
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bgp_notify_minor(int major, int minor)
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{
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static const char **table;
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int siz;
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static char buf[20];
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const char *p;
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if (0 <= major
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&& major < sizeof(bgpnotify_minor)/sizeof(bgpnotify_minor[0])
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&& bgpnotify_minor[major]) {
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table = bgpnotify_minor[major];
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siz = bgpnotify_minor_siz[major];
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if (0 <= minor && minor < siz && table[minor])
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p = table[minor];
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else
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p = NULL;
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} else
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p = NULL;
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if (p == NULL) {
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snprintf(buf, sizeof(buf), "#%d", minor);
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return buf;
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} else
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return p;
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}
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static int
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decode_prefix4(const u_char *pd, char *buf, int buflen)
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{
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struct in_addr addr;
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int plen;
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plen = pd[0];
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if (plen < 0 || 32 < plen)
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return -1;
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memset(&addr, 0, sizeof(addr));
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memcpy(&addr, &pd[1], (plen + 7) / 8);
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if (plen % 8) {
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((u_char *)&addr)[(plen + 7) / 8 - 1] &=
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((0xff00 >> (plen % 8)) & 0xff);
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}
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snprintf(buf, buflen, "%s/%d", getname((u_char *)&addr), plen);
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return 1 + (plen + 7) / 8;
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}
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#ifdef INET6
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static int
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decode_prefix6(const u_char *pd, char *buf, int buflen)
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{
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struct in6_addr addr;
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int plen;
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plen = pd[0];
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if (plen < 0 || 128 < plen)
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return -1;
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memset(&addr, 0, sizeof(addr));
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memcpy(&addr, &pd[1], (plen + 7) / 8);
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if (plen % 8) {
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addr.s6_addr[(plen + 7) / 8 - 1] &=
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((0xff00 >> (plen % 8)) & 0xff);
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}
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snprintf(buf, buflen, "%s/%d", getname6((char *)&addr), plen);
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return 1 + (plen + 7) / 8;
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}
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#endif
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static void
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bgp_attr_print(const struct bgp_attr *attr, const u_char *dat, int len)
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{
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int i;
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u_int16_t af;
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u_int8_t safi, snpa;
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int advance;
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int tlen;
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const u_char *p;
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char buf[MAXHOSTNAMELEN + 100];
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p = dat;
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switch (attr->bgpa_type) {
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case BGPTYPE_ORIGIN:
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if (len != 1)
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printf(" invalid len");
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else
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printf(" %s", bgp_attr_origin(p[0]));
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break;
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case BGPTYPE_AS_PATH:
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if (len % 2) {
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printf(" invalid len");
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break;
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}
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while (p < dat + len) {
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/*
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* under RFC1965, p[0] means:
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* 1: AS_SET 2: AS_SEQUENCE
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* 3: AS_CONFED_SET 4: AS_CONFED_SEQUENCE
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*/
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printf(" ");
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if (p[0] == 3 || p[0] == 4)
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printf("confed");
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printf("%s", (p[0] & 1) ? "{" : "");
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for (i = 0; i < p[1]; i += 2) {
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printf("%s%u", i == 0 ? "" : " ",
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ntohs(*(u_int16_t *)&p[2 + i]));
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}
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printf("%s", (p[0] & 1) ? "}" : "");
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p += 2 + p[1] * 2;
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}
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break;
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case BGPTYPE_NEXT_HOP:
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if (len != 4)
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printf(" invalid len");
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else
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printf(" %s", getname(p));
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break;
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case BGPTYPE_MULTI_EXIT_DISC:
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case BGPTYPE_LOCAL_PREF:
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if (len != 4)
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printf(" invalid len");
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else
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printf(" %u", (u_int32_t)ntohl(*(u_int32_t *)p));
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break;
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case BGPTYPE_ATOMIC_AGGREGATE:
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if (len != 0)
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printf(" invalid len");
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break;
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case BGPTYPE_AGGREGATOR:
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if (len != 6) {
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printf(" invalid len");
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break;
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}
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printf(" AS #%u, origin %s", ntohs(*(u_int16_t *)p),
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getname(p + 2));
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break;
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case BGPTYPE_COMMUNITIES:
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if (len % 4) {
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printf(" invalid len");
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break;
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}
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for (i = 0; i < len; i += 4) {
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u_int32_t comm;
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comm = (u_int32_t)ntohl(*(u_int32_t *)&p[i]);
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switch (comm) {
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case BGP_COMMUNITY_NO_EXPORT:
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printf(" NO_EXPORT");
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break;
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case BGP_COMMUNITY_NO_ADVERT:
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printf(" NO_ADVERTISE");
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break;
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case BGP_COMMUNITY_NO_EXPORT_SUBCONFED:
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printf(" NO_EXPORT_SUBCONFED");
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break;
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default:
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printf(" (AS #%d value 0x%04x)",
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(comm >> 16) & 0xffff, comm & 0xffff);
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break;
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}
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}
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break;
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case BGPTYPE_MP_REACH_NLRI:
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af = ntohs(*(u_int16_t *)p);
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safi = p[2];
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if (safi >= 128)
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printf(" %s vendor specific,", af_name(af));
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else {
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printf(" %s %s,", af_name(af),
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bgp_attr_nlri_safi(safi));
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}
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p += 3;
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if (af == AFNUM_INET)
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;
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#ifdef INET6
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else if (af == AFNUM_INET6)
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;
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#endif
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else
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break;
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tlen = p[0];
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if (tlen) {
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printf(" nexthop");
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i = 0;
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while (i < tlen) {
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switch (af) {
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case AFNUM_INET:
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printf(" %s", getname(p + 1 + i));
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i += sizeof(struct in_addr);
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break;
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#ifdef INET6
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case AFNUM_INET6:
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printf(" %s", getname6(p + 1 + i));
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i += sizeof(struct in6_addr);
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break;
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#endif
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default:
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printf(" (unknown af)");
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i = tlen; /*exit loop*/
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break;
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}
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}
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printf(",");
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}
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p += 1 + tlen;
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snpa = p[0];
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p++;
|
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if (snpa) {
|
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printf(" %u snpa", snpa);
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for (/*nothing*/; snpa > 0; snpa--) {
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printf("(%d bytes)", p[0]);
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p += p[0] + 1;
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}
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printf(",");
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}
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printf(" NLRI");
|
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while (len - (p - dat) > 0) {
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switch (af) {
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case AFNUM_INET:
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advance = decode_prefix4(p, buf, sizeof(buf));
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printf(" %s", buf);
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break;
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#ifdef INET6
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case AFNUM_INET6:
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advance = decode_prefix6(p, buf, sizeof(buf));
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printf(" %s", buf);
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break;
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#endif
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default:
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printf(" (unknown af)");
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advance = 0;
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p = dat + len;
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break;
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}
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p += advance;
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}
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break;
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case BGPTYPE_MP_UNREACH_NLRI:
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af = ntohs(*(u_int16_t *)p);
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safi = p[2];
|
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if (safi >= 128)
|
|
printf(" %s vendor specific,", af_name(af));
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else {
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printf(" %s %s,", af_name(af),
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bgp_attr_nlri_safi(safi));
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}
|
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p += 3;
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|
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printf(" Withdraw");
|
|
while (len - (p - dat) > 0) {
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switch (af) {
|
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case AFNUM_INET:
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advance = decode_prefix4(p, buf, sizeof(buf));
|
|
printf(" %s", buf);
|
|
break;
|
|
#ifdef INET6
|
|
case AFNUM_INET6:
|
|
advance = decode_prefix6(p, buf, sizeof(buf));
|
|
printf(" %s", buf);
|
|
break;
|
|
#endif
|
|
default:
|
|
printf(" (unknown af)");
|
|
advance = 0;
|
|
p = dat + len;
|
|
break;
|
|
}
|
|
|
|
p += advance;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
bgp_open_print(const u_char *dat, int length)
|
|
{
|
|
struct bgp_open bgpo;
|
|
struct bgp_opt bgpopt;
|
|
int hlen;
|
|
const u_char *opt;
|
|
int i;
|
|
|
|
TCHECK2(dat[0], sizeof(bgpo));
|
|
memcpy(&bgpo, dat, sizeof(bgpo));
|
|
hlen = ntohs(bgpo.bgpo_len);
|
|
|
|
printf(": Version %d,", bgpo.bgpo_version);
|
|
printf(" AS #%u,", ntohs(bgpo.bgpo_myas));
|
|
printf(" Holdtime %u,", ntohs(bgpo.bgpo_holdtime));
|
|
printf(" ID %s,", getname((u_char *)&bgpo.bgpo_id));
|
|
printf(" Option length %u", bgpo.bgpo_optlen);
|
|
|
|
/* ugly! */
|
|
opt = &((struct bgp_open *)dat)->bgpo_optlen;
|
|
opt++;
|
|
|
|
for (i = 0; i < bgpo.bgpo_optlen; i++) {
|
|
memcpy(&bgpopt, &opt[i], sizeof(bgpopt));
|
|
if (i + 2 + bgpopt.bgpopt_len > bgpo.bgpo_optlen) {
|
|
printf(" [|opt %d %d]", bgpopt.bgpopt_len, bgpopt.bgpopt_type);
|
|
break;
|
|
}
|
|
|
|
printf(" (option %s, len=%d)", bgp_opttype(bgpopt.bgpopt_type),
|
|
bgpopt.bgpopt_len);
|
|
i += sizeof(bgpopt) + bgpopt.bgpopt_len;
|
|
}
|
|
return;
|
|
trunc:
|
|
printf("[|BGP]");
|
|
}
|
|
|
|
static void
|
|
bgp_update_print(const u_char *dat, int length)
|
|
{
|
|
struct bgp bgp;
|
|
struct bgp_attr bgpa;
|
|
int hlen;
|
|
const u_char *p;
|
|
int len;
|
|
int i;
|
|
int newline;
|
|
|
|
TCHECK2(dat[0], sizeof(bgp));
|
|
memcpy(&bgp, dat, sizeof(bgp));
|
|
hlen = ntohs(bgp.bgp_len);
|
|
p = dat + BGP_SIZE; /*XXX*/
|
|
printf(":");
|
|
|
|
/* Unfeasible routes */
|
|
len = EXTRACT_16BITS(p);
|
|
if (len) {
|
|
/* Without keeping state from the original NLRI message,
|
|
* it's not possible to tell if this a v4 or v6 route,
|
|
* so only try to decode it if we're not v6 enabled.
|
|
*/
|
|
#ifdef INET6
|
|
printf(" (Withdrawn routes: %d bytes)", len);
|
|
#else
|
|
char buf[MAXHOSTNAMELEN + 100];
|
|
|
|
TCHECK2(p[2], len);
|
|
i = 2;
|
|
|
|
printf(" (Withdrawn routes:");
|
|
|
|
while(i < 2 + len) {
|
|
i += decode_prefix4(&p[i], buf, sizeof(buf));
|
|
printf(" %s", buf);
|
|
}
|
|
printf(")\n");
|
|
#endif
|
|
}
|
|
p += 2 + len;
|
|
|
|
TCHECK2(p[0], 2);
|
|
len = EXTRACT_16BITS(p);
|
|
if (len) {
|
|
/* do something more useful!*/
|
|
i = 2;
|
|
printf(" (Path attributes:"); /* ) */
|
|
newline = 0;
|
|
while (i < 2 + len) {
|
|
int alen, aoff;
|
|
|
|
TCHECK2(p[i], sizeof(bgpa));
|
|
memcpy(&bgpa, &p[i], sizeof(bgpa));
|
|
alen = bgp_attr_len(&bgpa);
|
|
aoff = bgp_attr_off(&bgpa);
|
|
|
|
if (vflag && newline)
|
|
printf("\n\t\t");
|
|
else
|
|
printf(" ");
|
|
printf("("); /* ) */
|
|
printf("%s", bgp_attr_type(bgpa.bgpa_type));
|
|
if (bgpa.bgpa_flags) {
|
|
printf("[%s%s%s%s",
|
|
bgpa.bgpa_flags & 0x80 ? "O" : "",
|
|
bgpa.bgpa_flags & 0x40 ? "T" : "",
|
|
bgpa.bgpa_flags & 0x20 ? "P" : "",
|
|
bgpa.bgpa_flags & 0x10 ? "E" : "");
|
|
if (bgpa.bgpa_flags & 0xf)
|
|
printf("+%x", bgpa.bgpa_flags & 0xf);
|
|
printf("]");
|
|
}
|
|
|
|
bgp_attr_print(&bgpa, &p[i + aoff], alen);
|
|
newline = 1;
|
|
|
|
/* ( */
|
|
printf(")");
|
|
|
|
i += aoff + alen;
|
|
}
|
|
|
|
/* ( */
|
|
printf(")");
|
|
}
|
|
p += 2 + len;
|
|
|
|
if (len && dat + length > p)
|
|
printf("\n\t\t");
|
|
if (dat + length > p) {
|
|
printf("(NLRI:"); /* ) */
|
|
while (dat + length > p) {
|
|
char buf[MAXHOSTNAMELEN + 100];
|
|
i = decode_prefix4(p, buf, sizeof(buf));
|
|
printf(" %s", buf);
|
|
if (i < 0)
|
|
break;
|
|
p += i;
|
|
}
|
|
|
|
/* ( */
|
|
printf(")");
|
|
}
|
|
return;
|
|
trunc:
|
|
printf("[|BGP]");
|
|
}
|
|
|
|
static void
|
|
bgp_notification_print(const u_char *dat, int length)
|
|
{
|
|
struct bgp_notification bgpn;
|
|
int hlen;
|
|
|
|
TCHECK2(dat[0], sizeof(bgpn));
|
|
memcpy(&bgpn, dat, sizeof(bgpn));
|
|
hlen = ntohs(bgpn.bgpn_len);
|
|
|
|
printf(": error %s,", bgp_notify_major(bgpn.bgpn_major));
|
|
printf(" subcode %s",
|
|
bgp_notify_minor(bgpn.bgpn_major, bgpn.bgpn_minor));
|
|
return;
|
|
trunc:
|
|
printf("[|BGP]");
|
|
}
|
|
|
|
static void
|
|
bgp_header_print(const u_char *dat, int length)
|
|
{
|
|
struct bgp bgp;
|
|
|
|
TCHECK2(dat[0], sizeof(bgp));
|
|
memcpy(&bgp, dat, sizeof(bgp));
|
|
printf("(%s", bgp_type(bgp.bgp_type)); /* ) */
|
|
|
|
switch (bgp.bgp_type) {
|
|
case BGP_OPEN:
|
|
bgp_open_print(dat, length);
|
|
break;
|
|
case BGP_UPDATE:
|
|
bgp_update_print(dat, length);
|
|
break;
|
|
case BGP_NOTIFICATION:
|
|
bgp_notification_print(dat, length);
|
|
break;
|
|
}
|
|
|
|
/* ( */
|
|
printf(")");
|
|
return;
|
|
trunc:
|
|
printf("[|BGP]");
|
|
}
|
|
|
|
void
|
|
bgp_print(const u_char *dat, int length)
|
|
{
|
|
const u_char *p;
|
|
const u_char *ep;
|
|
const u_char *start;
|
|
const u_char marker[] = {
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
};
|
|
struct bgp bgp;
|
|
u_int16_t hlen;
|
|
int newline;
|
|
|
|
ep = dat + length;
|
|
if (snapend < dat + length)
|
|
ep = snapend;
|
|
|
|
printf(": BGP");
|
|
|
|
p = dat;
|
|
newline = 0;
|
|
start = p;
|
|
while (p < snapend) {
|
|
if (!TTEST2(p[0], 1))
|
|
break;
|
|
if (p[0] != 0xff) {
|
|
p++;
|
|
continue;
|
|
}
|
|
|
|
if (!TTEST2(p[0], sizeof(marker)))
|
|
break;
|
|
if (memcmp(p, marker, sizeof(marker)) != 0) {
|
|
p++;
|
|
continue;
|
|
}
|
|
|
|
/* found BGP header */
|
|
TCHECK2(p[0], sizeof(bgp)); /*XXX*/
|
|
memcpy(&bgp, p, sizeof(bgp));
|
|
|
|
if (start != p)
|
|
printf(" [|BGP]");
|
|
|
|
hlen = ntohs(bgp.bgp_len);
|
|
if (vflag && newline)
|
|
printf("\n\t");
|
|
else
|
|
printf(" ");
|
|
if (TTEST2(p[0], hlen)) {
|
|
bgp_header_print(p, hlen);
|
|
newline = 1;
|
|
p += hlen;
|
|
start = p;
|
|
} else {
|
|
printf("[|BGP %s]", bgp_type(bgp.bgp_type));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
|
|
trunc:
|
|
printf(" [|BGP]");
|
|
}
|