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gerrit-public.fairphone.software / fp2-dev / platform / external / tcpdump / refs/tags/fp2-sibon-17.10.1 / . / print-vtp.c
blob: 04ae24c7d4356cfe37ffaf1b11e05a3e999e0426 [file] [log] [blame]
JP Abgrall53f17a92014-02-12 14:02:41 -0800[diff] [blame]1/*
2 * Copyright (c) 1998-2007 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
14 *
15 * VLAN TRUNKING PROTOCOL (VTP)
16 *
17 * Reference documentation:
18 * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml
19 * http://www.cisco.com/warp/public/473/21.html
20 * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
21 *
22 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
23 */
24
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <tcpdump-stdinc.h>
30
31#include <stdio.h>
32#include <string.h>
33
34#include "interface.h"
35#include "addrtoname.h"
36#include "extract.h"
37#include "nlpid.h"
38
39#define VTP_HEADER_LEN 36
40#define VTP_DOMAIN_NAME_LEN 32
41#define VTP_MD5_DIGEST_LEN 16
42#define VTP_UPDATE_TIMESTAMP_LEN 12
43#define VTP_VLAN_INFO_OFFSET 12
44
45#define VTP_SUMMARY_ADV 0x01
46#define VTP_SUBSET_ADV 0x02
47#define VTP_ADV_REQUEST 0x03
48#define VTP_JOIN_MESSAGE 0x04
49
50struct vtp_vlan_ {
51 u_int8_t len;
52 u_int8_t status;
53 u_int8_t type;
54 u_int8_t name_len;
55 u_int16_t vlanid;
56 u_int16_t mtu;
57 u_int32_t index;
58};
59
60static const struct tok vtp_message_type_values[] = {
61 { VTP_SUMMARY_ADV, "Summary advertisement"},
62 { VTP_SUBSET_ADV, "Subset advertisement"},
63 { VTP_ADV_REQUEST, "Advertisement request"},
64 { VTP_JOIN_MESSAGE, "Join message"},
65 { 0, NULL }
66};
67
68static const struct tok vtp_header_values[] = {
69 { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */
70 { 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */
71 { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
72 { 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
73 { 0, NULL }
74};
75
76static const struct tok vtp_vlan_type_values[] = {
77 { 0x01, "Ethernet"},
78 { 0x02, "FDDI"},
79 { 0x03, "TrCRF"},
80 { 0x04, "FDDI-net"},
81 { 0x05, "TrBRF"},
82 { 0, NULL }
83};
84
85static const struct tok vtp_vlan_status[] = {
86 { 0x00, "Operational"},
87 { 0x01, "Suspended"},
88 { 0, NULL }
89};
90
91#define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER 0x01
92#define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER 0x02
93#define VTP_VLAN_STP_TYPE 0x03
94#define VTP_VLAN_PARENT_VLAN 0x04
95#define VTP_VLAN_TRANS_BRIDGED_VLAN 0x05
96#define VTP_VLAN_PRUNING 0x06
97#define VTP_VLAN_BRIDGE_TYPE 0x07
98#define VTP_VLAN_ARP_HOP_COUNT 0x08
99#define VTP_VLAN_STE_HOP_COUNT 0x09
100#define VTP_VLAN_BACKUP_CRF_MODE 0x0A
101
102static const struct tok vtp_vlan_tlv_values[] = {
103 { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"},
104 { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"},
105 { VTP_VLAN_STP_TYPE, "STP type TLV"},
106 { VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"},
107 { VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"},
108 { VTP_VLAN_PRUNING, "Pruning TLV"},
109 { VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"},
110 { VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"},
111 { VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"},
112 { VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"},
113 { 0, NULL }
114};
115
116static const struct tok vtp_stp_type_values[] = {
117 { 1, "SRT"},
118 { 2, "SRB"},
119 { 3, "Auto"},
120 { 0, NULL }
121};
122
123void
124vtp_print (const u_char *pptr, u_int length)
125{
126 int type, len, tlv_len, tlv_value;
127 const u_char *tptr;
128 const struct vtp_vlan_ *vtp_vlan;
129
130 if (length < VTP_HEADER_LEN)
131 goto trunc;
132
133 tptr = pptr;
134
135 if (!TTEST2(*tptr, VTP_HEADER_LEN))
136 goto trunc;
137
138 type = *(tptr+1);
139 printf("VTPv%u, Message %s (0x%02x), length %u",
140 *tptr,
141 tok2str(vtp_message_type_values,"Unknown message type", type),
142 *(tptr+1),
143 length);
144
145 /* In non-verbose mode, just print version and message type */
146 if (vflag < 1) {
147 return;
148 }
149
150 /* verbose mode print all fields */
151 printf("\n\tDomain name: %s, %s: %u",
152 (tptr+4),
153 tok2str(vtp_header_values,"Unknown",*(tptr+1)),
154 *(tptr+2));
155
156 tptr += VTP_HEADER_LEN;
157
158 switch (type) {
159
160 case VTP_SUMMARY_ADV:
161
162 /*
163 * SUMMARY ADVERTISEMENT
164 *
165 * 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
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Version | Code | Followers | MmgtD Len |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 * | Management Domain Name |
170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
171 * | Configuration revision number |
172 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 * | Updater Identity IP address |
174 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
175 * | Update Timestamp (12 bytes) |
176 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
177 * | MD5 digest (16 bytes) |
178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 *
180 */
181
182 printf("\n\t Config Rev %x, Updater %s",
183 EXTRACT_32BITS(tptr),
184 ipaddr_string(tptr+4));
185 tptr += 8;
186 printf(", Timestamp 0x%08x 0x%08x 0x%08x",
187 EXTRACT_32BITS(tptr),
188 EXTRACT_32BITS(tptr + 4),
189 EXTRACT_32BITS(tptr + 8));
190 tptr += VTP_UPDATE_TIMESTAMP_LEN;
191 printf(", MD5 digest: %08x%08x%08x%08x",
192 EXTRACT_32BITS(tptr),
193 EXTRACT_32BITS(tptr + 4),
194 EXTRACT_32BITS(tptr + 8),
195 EXTRACT_32BITS(tptr + 12));
196 tptr += VTP_MD5_DIGEST_LEN;
197 break;
198
199 case VTP_SUBSET_ADV:
200
201 /*
202 * SUBSET ADVERTISEMENT
203 *
204 * 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
205 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
206 * | Version | Code | Seq number | MmgtD Len |
207 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
208 * | Management Domain Name |
209 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
210 * | Configuration revision number |
211 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
212 * | VLAN info field 1 |
213 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
214 * | ................ |
215 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
216 * | VLAN info field N |
217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 *
219 */
220
221 printf(", Config Rev %x", EXTRACT_32BITS(tptr));
222
223 /*
224 * VLAN INFORMATION
225 * 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
226 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
227 * | V info len | Status | VLAN type | VLAN name len |
228 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
229 * | ISL vlan id | MTU size |
230 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 * | 802.10 index (SAID) |
232 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
233 * | VLAN name |
234 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
235 *
236 */
237
238 tptr += 4;
239 while (tptr < (pptr+length)) {
240
241 len = *tptr;
242 if (len == 0)
243 break;
244
245 if (!TTEST2(*tptr, len))
246 goto trunc;
247
248 vtp_vlan = (struct vtp_vlan_*)tptr;
249 printf("\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s",
250 tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
251 tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
252 EXTRACT_16BITS(&vtp_vlan->vlanid),
253 EXTRACT_16BITS(&vtp_vlan->mtu),
254 EXTRACT_32BITS(&vtp_vlan->index),
255 (tptr + VTP_VLAN_INFO_OFFSET));
256
257 /*
258 * Vlan names are aligned to 32-bit boundaries.
259 */
260 len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
261 tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
262
263 /* TLV information follows */
264
265 while (len > 0) {
266
267 /*
268 * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1
269 * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
270 */
271 type = *tptr;
272 tlv_len = *(tptr+1);
273
274 printf("\n\t\t%s (0x%04x) TLV",
275 tok2str(vtp_vlan_tlv_values, "Unknown", type),
276 type);
277
278 /*
279 * infinite loop check
280 */
281 if (type == 0 || tlv_len == 0) {
282 return;
283 }
284
285 if (!TTEST2(*tptr, tlv_len*2 +2))
286 goto trunc;
287
288 tlv_value = EXTRACT_16BITS(tptr+2);
289
290 switch (type) {
291 case VTP_VLAN_STE_HOP_COUNT:
292 printf(", %u", tlv_value);
293 break;
294
295 case VTP_VLAN_PRUNING:
296 printf(", %s (%u)",
297 tlv_value == 1 ? "Enabled" : "Disabled",
298 tlv_value);
299 break;
300
301 case VTP_VLAN_STP_TYPE:
302 printf(", %s (%u)",
303 tok2str(vtp_stp_type_values, "Unknown", tlv_value),
304 tlv_value);
305 break;
306
307 case VTP_VLAN_BRIDGE_TYPE:
308 printf(", %s (%u)",
309 tlv_value == 1 ? "SRB" : "SRT",
310 tlv_value);
311 break;
312
313 case VTP_VLAN_BACKUP_CRF_MODE:
314 printf(", %s (%u)",
315 tlv_value == 1 ? "Backup" : "Not backup",
316 tlv_value);
317 break;
318
319 /*
320 * FIXME those are the defined TLVs that lack a decoder
321 * you are welcome to contribute code ;-)
322 */
323
324 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
325 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
326 case VTP_VLAN_PARENT_VLAN:
327 case VTP_VLAN_TRANS_BRIDGED_VLAN:
328 case VTP_VLAN_ARP_HOP_COUNT:
329 default:
330 print_unknown_data(tptr, "\n\t\t ", 2 + tlv_len*2);
331 break;
332 }
333 len -= 2 + tlv_len*2;
334 tptr += 2 + tlv_len*2;
335 }
336 }
337 break;
338
339 case VTP_ADV_REQUEST:
340
341 /*
342 * ADVERTISEMENT REQUEST
343 *
344 * 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
345 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
346 * | Version | Code | Reserved | MmgtD Len |
347 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
348 * | Management Domain Name |
349 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
350 * | Start value |
351 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
352 *
353 */
354
355 printf("\n\tStart value: %u", EXTRACT_32BITS(tptr));
356 break;
357
358 case VTP_JOIN_MESSAGE:
359
360 /* FIXME - Could not find message format */
361 break;
362
363 default:
364 break;
365 }
366
367 return;
368
369 trunc:
370 printf("[|vtp]");
371}
372
373/*
374 * Local Variables:
375 * c-style: whitesmith
376 * c-basic-offset: 4
377 * End:
378 */