1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/* packet-bfd.c
* Routines for Bi-directional Fault Detection (BFD) message dissection
*
* Copyright 2003, Hannes Gredler <hannes@juniper.net>
*
* $Id: packet-bfd.c,v 1.1 2003/11/23 22:00:48 gerald Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#define UDP_PORT_BFD_CONTROL 3784 /* draft-katz-ward-bfd-v4v6-1hop-00.txt */
static const value_string bfd_control_diag_values[] = {
{ 0, "No Diagnostic" },
{ 1, "Control Detection Time Expired" },
{ 2, "Echo Function Failed" },
{ 3, "Neighbor Signaled Session Down" },
{ 4, "Forwarding Plane Reset" },
{ 5, "Path Down" },
{ 6, "Concatenated Path Down" },
{ 7, "Administratively Down" },
{ 0, NULL }
};
static const value_string bfd_control_flag_values[] = {
{ 0x80, "I Hear You" },
{ 0x40, "Demand" },
{ 0x20, "Poll" },
{ 0x10, "Final" },
{ 0x08, "Reserved" },
{ 0x04, "Reserved" },
{ 0x02, "Reserved" },
{ 0x01, "Reserved" },
{ 0, NULL }
};
static gint proto_bfd = -1;
static gint hf_bfd_version = -1;
static gint hf_bfd_diag = -1;
static gint hf_bfd_flags = -1;
static gint hf_bfd_detect_time_multiplier = -1;
static gint hf_bfd_my_discriminator = -1;
static gint hf_bfd_your_discriminator = -1;
static gint hf_bfd_desired_min_tx_interval = -1;
static gint hf_bfd_required_min_rx_interval = -1;
static gint hf_bfd_required_min_echo_interval = -1;
static gint ett_bfd = -1;
/*
* Control packet, draft-katz-ward-bfd-01.txt
*
* 0 1 2 3
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Vers | Diag |H|D|P|F| Rsvd | Detect Mult | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | My Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Your Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Desired Min TX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min Echo RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
static void dissect_bfd_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
gint bfd_version = -1;
gint bfd_diag = -1;
gint bfd_flags = -1;
gint bfd_detect_time_multiplier = -1;
gint bfd_length = -1;
gint bfd_my_discriminator = -1;
gint bfd_your_discriminator = -1;
gint bfd_desired_min_tx_interval = -1;
gint bfd_required_min_rx_interval = -1;
gint bfd_required_min_echo_interval = -1;
proto_item *ti;
proto_tree *bfd_tree;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BFD Control");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
bfd_version = ((tvb_get_guint8(tvb, 0) & 0xe0) >> 5);
bfd_diag = (tvb_get_guint8(tvb, 0) & 0x1f);
bfd_flags = tvb_get_guint8(tvb, 1);
bfd_detect_time_multiplier = tvb_get_guint8(tvb, 2);
bfd_length = tvb_get_guint8(tvb, 3);
bfd_my_discriminator = tvb_get_ntohl(tvb, 4);
bfd_your_discriminator = tvb_get_ntohl(tvb, 8);
bfd_desired_min_tx_interval = tvb_get_ntohl(tvb, 12);
bfd_required_min_rx_interval = tvb_get_ntohl(tvb, 16);
bfd_required_min_echo_interval = tvb_get_ntohl(tvb, 20);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "Diag: %s, Flags: %s",
val_to_str(bfd_diag, bfd_control_diag_values, "UNKNOWN"),
decode_enumerated_bitfield(bfd_flags,
0xf0,
8,
bfd_control_flag_values,
"%s"));
}
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_bfd, tvb, 0, -1,
"BFD Control message");
bfd_tree = proto_item_add_subtree(ti, ett_bfd);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_version, tvb, 0,
1, bfd_version);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_diag, tvb, 0,
1, bfd_diag);
ti = proto_tree_add_text ( bfd_tree, tvb, 1, 1, "Message Flags: %s",
decode_enumerated_bitfield(bfd_flags,
0xf0,
8,
bfd_control_flag_values,
"%s"));
ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_detect_time_multiplier, tvb, 2,
1, bfd_detect_time_multiplier,
"%s: %u (= %u ms Detection time)",
proto_registrar_get_nth(hf_bfd_detect_time_multiplier) -> name,
bfd_detect_time_multiplier,
bfd_detect_time_multiplier * bfd_desired_min_tx_interval/1000);
ti = proto_tree_add_text ( bfd_tree, tvb, 3, 1, "Message Length: %u Bytes", bfd_length );
ti = proto_tree_add_uint(bfd_tree, hf_bfd_my_discriminator, tvb, 4,
4, bfd_my_discriminator);
ti = proto_tree_add_uint(bfd_tree, hf_bfd_your_discriminator, tvb, 8,
4, bfd_your_discriminator);
ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_desired_min_tx_interval, tvb, 12,
4, bfd_desired_min_tx_interval,
"%s: %4u ms",
proto_registrar_get_nth(hf_bfd_desired_min_tx_interval) -> name,
bfd_desired_min_tx_interval/1000);
ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_rx_interval, tvb, 16,
4, bfd_required_min_rx_interval,
"%s: %4u ms",
proto_registrar_get_nth(hf_bfd_required_min_rx_interval) -> name,
bfd_required_min_rx_interval/1000);
ti = proto_tree_add_uint_format(bfd_tree, hf_bfd_required_min_echo_interval, tvb, 20,
4, bfd_required_min_echo_interval,
"%s: %4u ms",
proto_registrar_get_nth(hf_bfd_required_min_echo_interval) -> name,
bfd_required_min_echo_interval/1000);
}
return;
}
/* Register the protocol with Ethereal */
void proto_register_bfd(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_bfd_version,
{ "Protocol Version", "bfd.version",
FT_UINT8, BASE_DEC, NULL , 0xe0,
"", HFILL }
},
{ &hf_bfd_diag,
{ "Diagnostic Code", "bfd.diag",
FT_UINT8, BASE_HEX, VALS(bfd_control_diag_values), 0x1f,
"", HFILL }
},
{ &hf_bfd_flags,
{ "Message Flags", "bfd.flags",
FT_UINT8, BASE_HEX, NULL, 0xf0,
"", HFILL }
},
{ &hf_bfd_detect_time_multiplier,
{ "Detect Time Multiplier", "bfd.detect_time_multiplier",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_my_discriminator,
{ "My Discriminator", "bfd.my_discriminator",
FT_UINT32, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_your_discriminator,
{ "Your Discriminator", "bfd.your_discriminator",
FT_UINT32, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_desired_min_tx_interval,
{ "Desired Min TX Interval", "bfd.desired_min_tx_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_required_min_rx_interval,
{ "Required Min RX Interval", "bfd.required_min_rx_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_bfd_required_min_echo_interval,
{ "Required Min Echo Interval", "bfd.required_min_echo_interval",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_bfd,
};
/* Register the protocol name and description */
proto_bfd = proto_register_protocol("Bi-directional Fault Detection Control Message",
"BFD Control",
"bfdcontrol");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_bfd, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_bfd(void)
{
dissector_handle_t bfd_control_handle;
bfd_control_handle = create_dissector_handle(dissect_bfd_control, proto_bfd);
dissector_add("udp.port", UDP_PORT_BFD_CONTROL, bfd_control_handle);
}
|
