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
274
275
276
277
278
279
|
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* Original code by Hannes Gredler (hannes@juniper.net)
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-bfd.c,v 1.5.2.4 2005/04/28 09:28:47 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <stdlib.h>
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
#include "udp.h"
/*
* Control packet, BFDv0, 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 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/*
* Control packet, BFDv1, draft-ietf-bfd-base-02.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 |Sta|P|F|C|A|D|R| Detect Mult | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | My Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Your Discriminator |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Desired Min TX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Required Min Echo RX Interval |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct bfd_header_t {
u_int8_t version_diag;
u_int8_t flags;
u_int8_t detect_time_multiplier;
u_int8_t length;
u_int8_t my_discriminator[4];
u_int8_t your_discriminator[4];
u_int8_t desired_min_tx_interval[4];
u_int8_t required_min_rx_interval[4];
u_int8_t required_min_echo_interval[4];
};
/*
* An optional Authentication Header may be present
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Auth Type | Auth Len | Authentication Data... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct bfd_auth_header_t {
u_int8_t auth_type;
u_int8_t auth_len;
u_int8_t auth_data;
};
static const struct tok bfd_v1_authentication_values[] = {
{ 0, "Reserved" },
{ 1, "Simple Password" },
{ 2, "Keyed MD5" },
{ 3, "Meticulous Keyed MD5" },
{ 4, "Keyed SHA1" },
{ 5, "Meticulous Keyed SHA1" },
{ 0, NULL }
};
#define BFD_EXTRACT_VERSION(x) (((x)&0xe0)>>5)
#define BFD_EXTRACT_DIAG(x) ((x)&0x1f)
static const struct tok bfd_port_values[] = {
{ BFD_CONTROL_PORT, "Control" },
{ BFD_ECHO_PORT, "Echo" },
{ 0, NULL }
};
static const struct tok bfd_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" },
{ 8, "Reverse Concatenated Path Down" },
{ 0, NULL }
};
static const struct tok bfd_v0_flag_values[] = {
{ 0x80, "I Hear You" },
{ 0x40, "Demand" },
{ 0x20, "Poll" },
{ 0x10, "Final" },
{ 0x08, "Reserved" },
{ 0x04, "Reserved" },
{ 0x02, "Reserved" },
{ 0x01, "Reserved" },
{ 0, NULL }
};
#define BFD_FLAG_AUTH 0x04
static const struct tok bfd_v1_flag_values[] = {
{ 0x20, "Poll" },
{ 0x10, "Final" },
{ 0x08, "Control Plane Independent" },
{ BFD_FLAG_AUTH, "Authentication Present" },
{ 0x02, "Demand" },
{ 0x01, "Reserved" },
{ 0, NULL }
};
static const struct tok bfd_v1_state_values[] = {
{ 0, "AdminDown" },
{ 1, "Down" },
{ 2, "Init" },
{ 3, "Up" },
{ 0, NULL }
};
void
bfd_print(register const u_char *pptr, register u_int len, register u_int port)
{
const struct bfd_header_t *bfd_header;
const struct bfd_auth_header_t *bfd_auth_header;
u_int8_t version;
bfd_header = (const struct bfd_header_t *)pptr;
TCHECK(*bfd_header);
version = BFD_EXTRACT_VERSION(bfd_header->version_diag);
switch (port << 8 | version) {
/* BFDv0 */
case (BFD_CONTROL_PORT << 8):
if (vflag < 1 )
{
printf("BFDv%u, %s, Flags: [%s], length: %u",
version,
tok2str(bfd_port_values, "unknown (%u)", port),
bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
len);
return;
}
printf("BFDv%u, length: %u\n\t%s, Flags: [%s], Diagnostic: %s (0x%02x)",
version,
len,
tok2str(bfd_port_values, "unknown (%u)", port),
bittok2str(bfd_v0_flag_values, "none", bfd_header->flags),
tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
BFD_EXTRACT_DIAG(bfd_header->version_diag));
printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
bfd_header->detect_time_multiplier,
bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
bfd_header->length);
printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
break;
/* BFDv1 */
case (BFD_CONTROL_PORT << 8 | 1):
if (vflag < 1 )
{
printf("BFDv%u, %s, State %s, Flags: [%s], length: %u",
version,
tok2str(bfd_port_values, "unknown (%u)", port),
tok2str(bfd_v1_state_values, "unknown (%u)", bfd_header->flags & 0xc0),
bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
len);
return;
}
printf("BFDv%u, length: %u\n\t%s, State %s, Flags: [%s], Diagnostic: %s (0x%02x)",
version,
len,
tok2str(bfd_port_values, "unknown (%u)", port),
tok2str(bfd_v1_state_values, "unknown (%u)", (bfd_header->flags & 0xc0) >> 6),
bittok2str(bfd_v1_flag_values, "none", bfd_header->flags & 0x3f),
tok2str(bfd_diag_values,"unknown",BFD_EXTRACT_DIAG(bfd_header->version_diag)),
BFD_EXTRACT_DIAG(bfd_header->version_diag));
printf("\n\tDetection Timer Multiplier: %u (%u ms Detection time), BFD Length: %u",
bfd_header->detect_time_multiplier,
bfd_header->detect_time_multiplier * EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000,
bfd_header->length);
printf("\n\tMy Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->my_discriminator));
printf(", Your Discriminator: 0x%08x", EXTRACT_32BITS(bfd_header->your_discriminator));
printf("\n\t Desired min Tx Interval: %4u ms", EXTRACT_32BITS(bfd_header->desired_min_tx_interval)/1000);
printf("\n\t Required min Rx Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_rx_interval)/1000);
printf("\n\t Required min Echo Interval: %4u ms", EXTRACT_32BITS(bfd_header->required_min_echo_interval)/1000);
if (bfd_header->flags & BFD_FLAG_AUTH) {
pptr += sizeof (const struct bfd_header_t);
bfd_auth_header = (const struct bfd_auth_header_t *)pptr;
TCHECK2(*bfd_auth_header, sizeof(const struct bfd_auth_header_t));
printf("\n\t%s (%u) Authentication, length %u present",
tok2str(bfd_v1_authentication_values,"Unknown",bfd_auth_header->auth_type),
bfd_auth_header->auth_type,
bfd_auth_header->auth_len);
}
break;
/* BFDv0 */
case (BFD_ECHO_PORT << 8): /* not yet supported - fall through */
/* BFDv1 */
case (BFD_ECHO_PORT << 8 | 1):
default:
printf("BFD, %s, length: %u",
tok2str(bfd_port_values, "unknown (%u)", port),
len);
if (vflag >= 1) {
if(!print_unknown_data(pptr,"\n\t",len))
return;
}
break;
}
return;
trunc:
printf("[|BFD]");
}
|
