2 * Routines for Bi-directional Fault Detection (BFD) message dissection
4 * Copyright 2003, Hannes Gredler <hannes@juniper.net>
6 * $Id: packet-bfd.c,v 1.1 2003/11/23 22:00:48 gerald Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
10 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
37 #include <epan/packet.h>
39 #define UDP_PORT_BFD_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
41 static const value_string bfd_control_diag_values[] = {
42 { 0, "No Diagnostic" },
43 { 1, "Control Detection Time Expired" },
44 { 2, "Echo Function Failed" },
45 { 3, "Neighbor Signaled Session Down" },
46 { 4, "Forwarding Plane Reset" },
48 { 6, "Concatenated Path Down" },
49 { 7, "Administratively Down" },
53 static const value_string bfd_control_flag_values[] = {
54 { 0x80, "I Hear You" },
65 static gint proto_bfd = -1;
67 static gint hf_bfd_version = -1;
68 static gint hf_bfd_diag = -1;
69 static gint hf_bfd_flags = -1;
70 static gint hf_bfd_detect_time_multiplier = -1;
71 static gint hf_bfd_my_discriminator = -1;
72 static gint hf_bfd_your_discriminator = -1;
73 static gint hf_bfd_desired_min_tx_interval = -1;
74 static gint hf_bfd_required_min_rx_interval = -1;
75 static gint hf_bfd_required_min_echo_interval = -1;
77 static gint ett_bfd = -1;
80 * Control packet, draft-katz-ward-bfd-01.txt
83 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
84 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
85 * |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
86 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
87 * | My Discriminator |
88 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
89 * | Your Discriminator |
90 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
91 * | Desired Min TX Interval |
92 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
93 * | Required Min RX Interval |
94 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
95 * | Required Min Echo RX Interval |
96 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
99 static void dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
101 gint bfd_version = -1;
104 gint bfd_detect_time_multiplier = -1;
105 gint bfd_length = -1;
106 gint bfd_my_discriminator = -1;
107 gint bfd_your_discriminator = -1;
108 gint bfd_desired_min_tx_interval = -1;
109 gint bfd_required_min_rx_interval = -1;
110 gint bfd_required_min_echo_interval = -1;
113 proto_tree *bfd_tree;
115 if (check_col(pinfo->cinfo, COL_PROTOCOL))
116 col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
117 if (check_col(pinfo->cinfo, COL_INFO))
118 col_clear(pinfo->cinfo, COL_INFO);
120 bfd_version = ((tvb_get_guint8(tvb, 0) & 0xe0) >> 5);
121 bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
122 bfd_flags = tvb_get_guint8(tvb, 1);
123 bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
124 bfd_length = tvb_get_guint8(tvb, 3);
126 bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
127 bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
128 bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
129 bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
130 bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
132 if (check_col(pinfo->cinfo, COL_INFO)) {
133 col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: %s",
134 val_to_str(bfd_diag, bfd_control_diag_values, "UNKNOWN"),
135 decode_enumerated_bitfield(bfd_flags,
138 bfd_control_flag_values,
143 ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, -1,
144 "BFD Control message");
146 bfd_tree = proto_item_add_subtree(ti, ett_bfd);
148 ti = proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
151 ti = proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
154 ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: %s",
155 decode_enumerated_bitfield(bfd_flags,
158 bfd_control_flag_values,
161 ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
162 1, bfd_detect_time_multiplier,
163 "%s: %u (= %u ms Detection time)",
164 proto_registrar_get_nth(hf_bfd_detect_time_multiplier) -> name,
165 bfd_detect_time_multiplier,
166 bfd_detect_time_multiplier * bfd_desired_min_tx_interval/1000);
168 ti = proto_tree_add_text ( bfd_tree, tvb, 3, 1, "Message Length: %u Bytes", bfd_length );
170 ti = proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
171 4, bfd_my_discriminator);
173 ti = proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
174 4, bfd_your_discriminator);
176 ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
177 4, bfd_desired_min_tx_interval,
179 proto_registrar_get_nth(hf_bfd_desired_min_tx_interval) -> name,
180 bfd_desired_min_tx_interval/1000);
182 ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
183 4, bfd_required_min_rx_interval,
185 proto_registrar_get_nth(hf_bfd_required_min_rx_interval) -> name,
186 bfd_required_min_rx_interval/1000);
188 ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
189 4, bfd_required_min_echo_interval,
191 proto_registrar_get_nth(hf_bfd_required_min_echo_interval) -> name,
192 bfd_required_min_echo_interval/1000);
198 /* Register the protocol with Ethereal */
199 void proto_register_bfd(void)
202 /* Setup list of header fields */
203 static hf_register_info hf[] = {
205 { "Protocol Version", "bfd.version",
206 FT_UINT8, BASE_DEC, NULL , 0xe0,
210 { "Diagnostic Code", "bfd.diag",
211 FT_UINT8, BASE_HEX, VALS(bfd_control_diag_values), 0x1f,
215 { "Message Flags", "bfd.flags",
216 FT_UINT8, BASE_HEX, NULL, 0xf0,
219 { &hf_bfd_detect_time_multiplier,
220 { "Detect Time Multiplier", "bfd.detect_time_multiplier",
221 FT_UINT8, BASE_DEC, NULL, 0x0,
224 { &hf_bfd_my_discriminator,
225 { "My Discriminator", "bfd.my_discriminator",
226 FT_UINT32, BASE_HEX, NULL, 0x0,
229 { &hf_bfd_your_discriminator,
230 { "Your Discriminator", "bfd.your_discriminator",
231 FT_UINT32, BASE_HEX, NULL, 0x0,
234 { &hf_bfd_desired_min_tx_interval,
235 { "Desired Min TX Interval", "bfd.desired_min_tx_interval",
236 FT_UINT32, BASE_DEC, NULL, 0x0,
239 { &hf_bfd_required_min_rx_interval,
240 { "Required Min RX Interval", "bfd.required_min_rx_interval",
241 FT_UINT32, BASE_DEC, NULL, 0x0,
244 { &hf_bfd_required_min_echo_interval,
245 { "Required Min Echo Interval", "bfd.required_min_echo_interval",
246 FT_UINT32, BASE_DEC, NULL, 0x0,
251 /* Setup protocol subtree array */
252 static gint *ett[] = {
256 /* Register the protocol name and description */
257 proto_bfd = proto_register_protocol("Bi-directional Fault Detection Control Message",
261 /* Required function calls to register the header fields and subtrees used */
262 proto_register_field_array(proto_bfd, hf, array_length(hf));
263 proto_register_subtree_array(ett, array_length(ett));
267 proto_reg_handoff_bfd(void)
269 dissector_handle_t bfd_control_handle;
271 bfd_control_handle = create_dissector_handle(dissect_bfd_control, proto_bfd);
272 dissector_add("udp.port", UDP_PORT_BFD_CONTROL, bfd_control_handle);