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
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
|
/*
* Copyright (c) 1998-2007 The TCPDUMP project
*
* 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.
*
* VLAN TRUNKING PROTOCOL (VTP)
*
* Reference documentation:
* http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml
* http://www.cisco.com/warp/public/473/21.html
* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
*
* Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "nlpid.h"
#define VTP_HEADER_LEN 36
#define VTP_DOMAIN_NAME_LEN 32
#define VTP_MD5_DIGEST_LEN 16
#define VTP_UPDATE_TIMESTAMP_LEN 12
#define VTP_VLAN_INFO_OFFSET 12
#define VTP_SUMMARY_ADV 0x01
#define VTP_SUBSET_ADV 0x02
#define VTP_ADV_REQUEST 0x03
#define VTP_JOIN_MESSAGE 0x04
struct vtp_vlan_ {
u_int8_t len;
u_int8_t status;
u_int8_t type;
u_int8_t name_len;
u_int16_t vlanid;
u_int16_t mtu;
u_int32_t index;
};
static struct tok vtp_message_type_values[] = {
{ VTP_SUMMARY_ADV, "Summary advertisement"},
{ VTP_SUBSET_ADV, "Subset advertisement"},
{ VTP_ADV_REQUEST, "Advertisement request"},
{ VTP_JOIN_MESSAGE, "Join message"},
{ 0, NULL }
};
static struct tok vtp_header_values[] = {
{ 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */
{ 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */
{ 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
{ 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
{ 0, NULL }
};
static struct tok vtp_vlan_type_values[] = {
{ 0x01, "Ethernet"},
{ 0x02, "FDDI"},
{ 0x03, "TrCRF"},
{ 0x04, "FDDI-net"},
{ 0x05, "TrBRF"},
{ 0, NULL }
};
static struct tok vtp_vlan_status[] = {
{ 0x00, "Operational"},
{ 0x01, "Suspended"},
{ 0, NULL }
};
#define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER 0x01
#define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER 0x02
#define VTP_VLAN_STP_TYPE 0x03
#define VTP_VLAN_PARENT_VLAN 0x04
#define VTP_VLAN_TRANS_BRIDGED_VLAN 0x05
#define VTP_VLAN_PRUNING 0x06
#define VTP_VLAN_BRIDGE_TYPE 0x07
#define VTP_VLAN_ARP_HOP_COUNT 0x08
#define VTP_VLAN_STE_HOP_COUNT 0x09
#define VTP_VLAN_BACKUP_CRF_MODE 0x0A
static struct tok vtp_vlan_tlv_values[] = {
{ VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"},
{ VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"},
{ VTP_VLAN_STP_TYPE, "STP type TLV"},
{ VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"},
{ VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"},
{ VTP_VLAN_PRUNING, "Pruning TLV"},
{ VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"},
{ VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"},
{ VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"},
{ VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"},
{ 0, NULL }
};
static struct tok vtp_stp_type_values[] = {
{ 1, "SRT"},
{ 2, "SRB"},
{ 3, "Auto"},
{ 0, NULL }
};
void
vtp_print (const u_char *pptr, u_int length)
{
int type, len, tlv_len, tlv_value;
const u_char *tptr;
const struct vtp_vlan_ *vtp_vlan;
if (length < VTP_HEADER_LEN)
goto trunc;
tptr = pptr;
if (!TTEST2(*tptr, VTP_HEADER_LEN))
goto trunc;
type = *(tptr+1);
printf("VTPv%u, Message %s (0x%02x), length %u",
*tptr,
tok2str(vtp_message_type_values,"Unknown message type", type),
*(tptr+1),
length);
/* In non-verbose mode, just print version and message type */
if (vflag < 1) {
return;
}
/* verbose mode print all fields */
printf("\n\tDomain name: %s, %s: %u",
(tptr+4),
tok2str(vtp_header_values,"Unknown",*(tptr+1)),
*(tptr+2));
tptr += VTP_HEADER_LEN;
switch (type) {
case VTP_SUMMARY_ADV:
/*
* SUMMARY ADVERTISEMENT
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Version | Code | Followers | MmgtD Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Management Domain Name |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Configuration revision number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Updater Identity IP address |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Update Timestamp (12 bytes) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | MD5 digest (16 bytes) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
printf("\n\t Config Rev %x, Updater %s",
EXTRACT_32BITS(tptr),
ipaddr_string(tptr+4));
tptr += 8;
printf(", Timestamp 0x%08x 0x%08x 0x%08x",
EXTRACT_32BITS(tptr),
EXTRACT_32BITS(tptr + 4),
EXTRACT_32BITS(tptr + 8));
tptr += VTP_UPDATE_TIMESTAMP_LEN;
printf(", MD5 digest: %08x%08x%08x%08x",
EXTRACT_32BITS(tptr),
EXTRACT_32BITS(tptr + 4),
EXTRACT_32BITS(tptr + 8),
EXTRACT_32BITS(tptr + 12));
tptr += VTP_MD5_DIGEST_LEN;
break;
case VTP_SUBSET_ADV:
/*
* SUBSET ADVERTISEMENT
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Version | Code | Seq number | MmgtD Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Management Domain Name |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Configuration revision number |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | VLAN info field 1 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ................ |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | VLAN info field N |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
printf(", Config Rev %x", EXTRACT_32BITS(tptr));
/*
* VLAN INFORMATION
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | V info len | Status | VLAN type | VLAN name len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | ISL vlan id | MTU size |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | 802.10 index (SAID) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | VLAN name |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
tptr += 4;
while (tptr < (pptr+length)) {
len = *tptr;
if (len == 0)
break;
if (!TTEST2(*tptr, len))
goto trunc;
vtp_vlan = (struct vtp_vlan_*)tptr;
printf("\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s",
tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
EXTRACT_16BITS(&vtp_vlan->vlanid),
EXTRACT_16BITS(&vtp_vlan->mtu),
EXTRACT_32BITS(&vtp_vlan->index),
(tptr + VTP_VLAN_INFO_OFFSET));
/*
* Vlan names are aligned to 32-bit boundaries.
*/
len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
/* TLV information follows */
while (len > 0) {
/*
* Cisco specs says 2 bytes for type + 2 bytes for length, take only 1
* See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
*/
type = *tptr;
tlv_len = *(tptr+1);
printf("\n\t\t%s (0x%04x) TLV",
tok2str(vtp_vlan_tlv_values, "Unknown", type),
type);
/*
* infinite loop check
*/
if (type == 0 || tlv_len == 0) {
return;
}
if (!TTEST2(*tptr, tlv_len*2 +2))
goto trunc;
tlv_value = EXTRACT_16BITS(tptr+2);
switch (type) {
case VTP_VLAN_STE_HOP_COUNT:
printf(", %u", tlv_value);
break;
case VTP_VLAN_PRUNING:
printf(", %s (%u)",
tlv_value == 1 ? "Enabled" : "Disabled",
tlv_value);
break;
case VTP_VLAN_STP_TYPE:
printf(", %s (%u)",
tok2str(vtp_stp_type_values, "Unknown", tlv_value),
tlv_value);
break;
case VTP_VLAN_BRIDGE_TYPE:
printf(", %s (%u)",
tlv_value == 1 ? "SRB" : "SRT",
tlv_value);
break;
case VTP_VLAN_BACKUP_CRF_MODE:
printf(", %s (%u)",
tlv_value == 1 ? "Backup" : "Not backup",
tlv_value);
break;
/*
* FIXME those are the defined TLVs that lack a decoder
* you are welcome to contribute code ;-)
*/
case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
case VTP_VLAN_PARENT_VLAN:
case VTP_VLAN_TRANS_BRIDGED_VLAN:
case VTP_VLAN_ARP_HOP_COUNT:
default:
print_unknown_data(tptr, "\n\t\t ", 2 + tlv_len*2);
break;
}
len -= 2 + tlv_len*2;
tptr += 2 + tlv_len*2;
}
}
break;
case VTP_ADV_REQUEST:
/*
* ADVERTISEMENT REQUEST
*
* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Version | Code | Reserved | MmgtD Len |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Management Domain Name |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Start value |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
printf("\n\tStart value: %u", EXTRACT_32BITS(tptr));
break;
case VTP_JOIN_MESSAGE:
/* FIXME - Could not find message format */
break;
default:
break;
}
return;
trunc:
printf("[|vtp]");
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 4
* End:
*/
|
