2 * Definitions for BGP packet disassembly structures and routine
4 * $Id: packet-bgp.h,v 1.4 1999/11/11 21:08:52 itojun Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@unicom.net>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #ifndef __PACKET_BGP_H__
26 #define __PACKET_BGP_H__
28 /* some handy things to know */
29 #define BGP_MAX_PACKET_SIZE 4096
30 #define BGP_MARKER_SIZE 16
31 #define BGP_HEADER_SIZE 19
32 #define BGP_MIN_OPEN_MSG_SIZE 29
33 #define BGP_MIN_UPDATE_MSG_SIZE 23
34 #define BGP_MIN_NOTIFICATION_MSG_SIZE 21
35 #define BGP_MIN_KEEPALVE_MSG_SIZE BGP_HEADER_SIZE
36 #define BGP_MAX_AS_PATH_LENGTH 32 /* guint16s */
40 #define BGP_NOTIFICATION 3
41 #define BGP_KEEPALIVE 4
44 guint8 bgp_marker[BGP_MARKER_SIZE];
50 guint8 bgpo_marker[BGP_MARKER_SIZE];
55 guint16 bgpo_holdtime;
58 /* options should follow */
61 struct bgp_notification {
62 guint8 bgpn_marker[BGP_MARKER_SIZE];
67 /* data should follow */
75 /* attribute flags, from RFC 1771 */
76 #define BGP_ATTR_FLAG_OPTIONAL 0x80
77 #define BGP_ATTR_FLAG_TRANSITIVE 0x40
78 #define BGP_ATTR_FLAG_PARTIAL 0x20
79 #define BGP_ATTR_FLAG_EXTENDED_LENGTH 0x10
81 /* AS_PATH segment types, from RFC 1771 */
85 #define BGPTYPE_ORIGIN 1 /* RFC1771 */
86 #define BGPTYPE_AS_PATH 2 /* RFC1771 */
87 #define BGPTYPE_NEXT_HOP 3 /* RFC1771 */
88 #define BGPTYPE_MULTI_EXIT_DISC 4 /* RFC1771 */
89 #define BGPTYPE_LOCAL_PREF 5 /* RFC1771 */
90 #define BGPTYPE_ATOMIC_AGGREGATE 6 /* RFC1771 */
91 #define BGPTYPE_AGGREGATOR 7 /* RFC1771 */
92 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
93 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1998 */
94 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1998 */
95 #define BGPTYPE_DPA 11 /* work in progress */
96 #define BGPTYPE_ADVERTISERS 12 /* RFC1863 */
97 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */
98 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
99 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
101 /* RFC1700 address family numbers */
103 #define AFNUM_INET6 2
106 #define AFNUM_BBN1822 5
111 #define AFNUM_X121 10
113 #define AFNUM_ATALK 12
114 #define AFNUM_DECNET 13
115 #define AFNUM_BANYAN 14
116 #define AFNUM_E164NSAP 15
118 #define CHECK_SIZE(x, s, l) \
120 if ((x) + (s) > (l)) \
125 #define offsetof(type, member) ((size_t)(&((type *)0)->member))
129 * Convert prefix length into number of guint8s needed for prefix.
131 #define convert_prefix(p) (((p) + 7) / (8))