2 * Definitions for BGP packet disassembly structures and routine
4 * $Id: packet-bgp.h,v 1.9 2000/04/11 14:21:37 itojun Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@zing.org>
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
37 /* BGP message types */
40 #define BGP_NOTIFICATION 3
41 #define BGP_KEEPALIVE 4
45 guint8 bgp_marker[BGP_MARKER_SIZE];
50 /* BGP OPEN message */
52 guint8 bgpo_marker[BGP_MARKER_SIZE];
57 guint16 bgpo_holdtime;
60 /* options should follow */
63 /* BGP NOTIFICATION message */
64 struct bgp_notification {
65 guint8 bgpn_marker[BGP_MARKER_SIZE];
70 /* data should follow */
79 /* attribute flags, from RFC1771 */
80 #define BGP_ATTR_FLAG_OPTIONAL 0x80
81 #define BGP_ATTR_FLAG_TRANSITIVE 0x40
82 #define BGP_ATTR_FLAG_PARTIAL 0x20
83 #define BGP_ATTR_FLAG_EXTENDED_LENGTH 0x10
85 /* AS_PATH segment types */
86 #define AS_SET 1 /* RFC1771 */
87 #define AS_SEQUENCE 2 /* RFC1771 */
88 /* This is wrong according to the RFC... in the Zebra code they say that
89 cisco reversed it. Packet traces seem to agree. */
90 #define AS_CONFED_SET 4 /* RFC1965 */
91 #define AS_CONFED_SEQUENCE 3 /* RFC1965 */
93 /* well-known communities, from RFC1997 */
94 #define BGP_COMM_NO_EXPORT 0xFFFFFF01
95 #define BGP_COMM_NO_ADVERTISE 0xFFFFFF02
96 #define BGP_COMM_NO_EXPORT_SUBCONFED 0xFFFFFF03
97 #define FOURHEX0 0x0000
98 #define FOURHEXF 0xFFFF
100 /* attribute types */
101 #define BGPTYPE_ORIGIN 1 /* RFC1771 */
102 #define BGPTYPE_AS_PATH 2 /* RFC1771 */
103 #define BGPTYPE_NEXT_HOP 3 /* RFC1771 */
104 #define BGPTYPE_MULTI_EXIT_DISC 4 /* RFC1771 */
105 #define BGPTYPE_LOCAL_PREF 5 /* RFC1771 */
106 #define BGPTYPE_ATOMIC_AGGREGATE 6 /* RFC1771 */
107 #define BGPTYPE_AGGREGATOR 7 /* RFC1771 */
108 #define BGPTYPE_COMMUNITIES 8 /* RFC1997 */
109 #define BGPTYPE_ORIGINATOR_ID 9 /* RFC1966 */
110 #define BGPTYPE_CLUSTER_LIST 10 /* RFC1966 */
111 #define BGPTYPE_DPA 11 /* work in progress */
112 #define BGPTYPE_ADVERTISER 12 /* RFC1863 */
113 #define BGPTYPE_RCID_PATH 13 /* RFC1863 */
114 #define BGPTYPE_MP_REACH_NLRI 14 /* RFC2283 */
115 #define BGPTYPE_MP_UNREACH_NLRI 15 /* RFC2283 */
117 /* RFC1700 address family numbers */
119 #define AFNUM_INET6 2
122 #define AFNUM_BBN1822 5
127 #define AFNUM_X121 10
129 #define AFNUM_ATALK 12
130 #define AFNUM_DECNET 13
131 #define AFNUM_BANYAN 14
132 #define AFNUM_E164NSAP 15
134 #define CHECK_SIZE(x, s, l) \
136 if ((x) + (s) > (l)) \
141 #define offsetof(type, member) ((size_t)(&((type *)0)->member))