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/* packet-bgp.c
* Definitions for BGP packet disassembly structures and routine
*
* $Id: packet-bgp.h,v 1.9 2000/04/11 14:21:37 itojun Exp $
*
* 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.
*/
#ifndef __PACKET_BGP_H__
#define __PACKET_BGP_H__
/* some handy things to know */
#define BGP_MAX_PACKET_SIZE 4096
#define BGP_MARKER_SIZE 16
#define BGP_HEADER_SIZE 19
#define BGP_MIN_OPEN_MSG_SIZE 29
#define BGP_MIN_UPDATE_MSG_SIZE 23
#define BGP_MIN_NOTIFICATION_MSG_SIZE 21
#define BGP_MIN_KEEPALVE_MSG_SIZE BGP_HEADER_SIZE
/* BGP message types */
#define BGP_OPEN 1
#define BGP_UPDATE 2
#define BGP_NOTIFICATION 3
#define BGP_KEEPALIVE 4
/* BGP header */
struct bgp {
guint8 bgp_marker[BGP_MARKER_SIZE];
guint16 bgp_len;
guint8 bgp_type;
};
/* BGP OPEN message */
struct bgp_open {
guint8 bgpo_marker[BGP_MARKER_SIZE];
guint16 bgpo_len;
guint8 bgpo_type;
guint8 bgpo_version;
guint16 bgpo_myas;
guint16 bgpo_holdtime;
guint32 bgpo_id;
guint8 bgpo_optlen;
/* options should follow */
};
/* BGP NOTIFICATION message */
struct bgp_notification {
guint8 bgpn_marker[BGP_MARKER_SIZE];
guint16 bgpn_len;
guint8 bgpn_type;
guint8 bgpn_major;
guint8 bgpn_minor;
/* data should follow */
};
/* path attribute */
struct bgp_attr {
guint8 bgpa_flags;
guint8 bgpa_type;
};
/* attribute flags, from RFC1771 */
#define BGP_ATTR_FLAG_OPTIONAL 0x80
#define BGP_ATTR_FLAG_TRANSITIVE 0x40
#define BGP_ATTR_FLAG_PARTIAL 0x20
#define BGP_ATTR_FLAG_EXTENDED_LENGTH 0x10
/* AS_PATH segment types */
#define AS_SET 1 /* RFC1771 */
#define AS_SEQUENCE 2 /* RFC1771 */
/* This is wrong according to the RFC... in the Zebra code they say that
cisco reversed it. Packet traces seem to agree. */
#define AS_CONFED_SET 4 /* RFC1965 */
#define AS_CONFED_SEQUENCE 3 /* RFC1965 */
/* well-known communities, from RFC1997 */
#define BGP_COMM_NO_EXPORT 0xFFFFFF01
#define BGP_COMM_NO_ADVERTISE 0xFFFFFF02
#define BGP_COMM_NO_EXPORT_SUBCONFED 0xFFFFFF03
#define FOURHEX0 0x0000
#define FOURHEXF 0xFFFF
/* attribute types */
#define BGPTYPE_ORIGIN 1 /* RFC1771 */
#define BGPTYPE_AS_PATH 2 /* RFC1771 */
#define BGPTYPE_NEXT_HOP 3 /* RFC1771 */
#define BGPTYPE_MULTI_EXIT_DISC 4 /* RFC1771 */
#define BGPTYPE_LOCAL_PREF 5 /* RFC1771 */
#define BGPTYPE_ATOMIC_AGGREGATE 6 /* RFC1771 */
#define BGPTYPE_AGGREGATOR 7 /* RFC1771 */
#define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
#define BGPTYPE_ORIGINATOR_ID 9 /* RFC1966 */
#define BGPTYPE_CLUSTER_LIST 10 /* RFC1966 */
#define BGPTYPE_DPA 11 /* work in progress */
#define BGPTYPE_ADVERTISER 12 /* RFC1863 */
#define BGPTYPE_RCID_PATH 13 /* RFC1863 */
#define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
#define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
/* RFC1700 address family numbers */
#define AFNUM_INET 1
#define AFNUM_INET6 2
#define AFNUM_NSAP 3
#define AFNUM_HDLC 4
#define AFNUM_BBN1822 5
#define AFNUM_802 6
#define AFNUM_E163 7
#define AFNUM_E164 8
#define AFNUM_F69 9
#define AFNUM_X121 10
#define AFNUM_IPX 11
#define AFNUM_ATALK 12
#define AFNUM_DECNET 13
#define AFNUM_BANYAN 14
#define AFNUM_E164NSAP 15
#define CHECK_SIZE(x, s, l) \
do { \
if ((x) + (s) > (l)) \
return; \
} while (0)
#ifndef offsetof
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
#endif
#endif
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