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print-vtp.c (313537) print-vtp.c (327234)
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 * Reference documentation:
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 * Reference documentation:
16 * http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml
17 * http://www.cisco.com/warp/public/473/21.html
18 * http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
16 * http://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html
17 * http://docstore.mik.ua/univercd/cc/td/doc/product/lan/trsrb/frames.htm
19 *
20 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
21 */
22
23/* \summary: Cisco VLAN Trunking Protocol (VTP) printer */
24
25#ifdef HAVE_CONFIG_H
26#include "config.h"

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31#include "netdissect.h"
32#include "addrtoname.h"
33#include "extract.h"
34
35#define VTP_HEADER_LEN 36
36#define VTP_DOMAIN_NAME_LEN 32
37#define VTP_MD5_DIGEST_LEN 16
38#define VTP_UPDATE_TIMESTAMP_LEN 12
18 *
19 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
20 */
21
22/* \summary: Cisco VLAN Trunking Protocol (VTP) printer */
23
24#ifdef HAVE_CONFIG_H
25#include "config.h"

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30#include "netdissect.h"
31#include "addrtoname.h"
32#include "extract.h"
33
34#define VTP_HEADER_LEN 36
35#define VTP_DOMAIN_NAME_LEN 32
36#define VTP_MD5_DIGEST_LEN 16
37#define VTP_UPDATE_TIMESTAMP_LEN 12
39#define VTP_VLAN_INFO_OFFSET 12
38#define VTP_VLAN_INFO_FIXED_PART_LEN 12 /* length of VLAN info before VLAN name */
40
41#define VTP_SUMMARY_ADV 0x01
42#define VTP_SUBSET_ADV 0x02
43#define VTP_ADV_REQUEST 0x03
44#define VTP_JOIN_MESSAGE 0x04
45
46struct vtp_vlan_ {
47 uint8_t len;

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218 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
219 * | ................ |
220 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 * | VLAN info field N |
222 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
223 *
224 */
225
39
40#define VTP_SUMMARY_ADV 0x01
41#define VTP_SUBSET_ADV 0x02
42#define VTP_ADV_REQUEST 0x03
43#define VTP_JOIN_MESSAGE 0x04
44
45struct vtp_vlan_ {
46 uint8_t len;

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217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 * | ................ |
219 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
220 * | VLAN info field N |
221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
222 *
223 */
224
225 ND_TCHECK_32BITS(tptr);
226 ND_PRINT((ndo, ", Config Rev %x", EXTRACT_32BITS(tptr)));
227
228 /*
229 * VLAN INFORMATION
230 * 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
231 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 * | V info len | Status | VLAN type | VLAN name len |
233 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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238 * | VLAN name |
239 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
240 *
241 */
242
243 tptr += 4;
244 while (tptr < (pptr+length)) {
245
226 ND_PRINT((ndo, ", Config Rev %x", EXTRACT_32BITS(tptr)));
227
228 /*
229 * VLAN INFORMATION
230 * 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
231 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
232 * | V info len | Status | VLAN type | VLAN name len |
233 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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238 * | VLAN name |
239 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
240 *
241 */
242
243 tptr += 4;
244 while (tptr < (pptr+length)) {
245
246 ND_TCHECK_8BITS(tptr);
246 len = *tptr;
247 if (len == 0)
248 break;
249
250 ND_TCHECK2(*tptr, len);
251
252 vtp_vlan = (const struct vtp_vlan_*)tptr;
247 len = *tptr;
248 if (len == 0)
249 break;
250
251 ND_TCHECK2(*tptr, len);
252
253 vtp_vlan = (const struct vtp_vlan_*)tptr;
254 if (len < VTP_VLAN_INFO_FIXED_PART_LEN)
255 goto trunc;
253 ND_TCHECK(*vtp_vlan);
254 ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name ",
255 tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
256 tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
257 EXTRACT_16BITS(&vtp_vlan->vlanid),
258 EXTRACT_16BITS(&vtp_vlan->mtu),
259 EXTRACT_32BITS(&vtp_vlan->index)));
256 ND_TCHECK(*vtp_vlan);
257 ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name ",
258 tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
259 tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
260 EXTRACT_16BITS(&vtp_vlan->vlanid),
261 EXTRACT_16BITS(&vtp_vlan->mtu),
262 EXTRACT_32BITS(&vtp_vlan->index)));
260 fn_printzp(ndo, tptr + VTP_VLAN_INFO_OFFSET, vtp_vlan->name_len, NULL);
263 len -= VTP_VLAN_INFO_FIXED_PART_LEN;
264 tptr += VTP_VLAN_INFO_FIXED_PART_LEN;
265 if (len < 4*((vtp_vlan->name_len + 3)/4))
266 goto trunc;
267 ND_TCHECK2(*tptr, vtp_vlan->name_len);
268 fn_printzp(ndo, tptr, vtp_vlan->name_len, NULL);
261
269
262 /*
263 * Vlan names are aligned to 32-bit boundaries.
264 */
265 len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
266 tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
270 /*
271 * Vlan names are aligned to 32-bit boundaries.
272 */
273 len -= 4*((vtp_vlan->name_len + 3)/4);
274 tptr += 4*((vtp_vlan->name_len + 3)/4);
267
268 /* TLV information follows */
269
270 while (len > 0) {
271
272 /*
275
276 /* TLV information follows */
277
278 while (len > 0) {
279
280 /*
273 * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1
274 * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
281 * Cisco specs say 2 bytes for type + 2 bytes for length;
282 * see http://docstore.mik.ua/univercd/cc/td/doc/product/lan/trsrb/frames.htm
283 * However, actual packets on the wire appear to use 1
284 * byte for the type and 1 byte for the length, so that's
285 * what we do.
275 */
286 */
287 if (len < 2)
288 goto trunc;
289 ND_TCHECK2(*tptr, 2);
276 type = *tptr;
277 tlv_len = *(tptr+1);
278
279 ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV",
280 tok2str(vtp_vlan_tlv_values, "Unknown", type),
281 type));
282
290 type = *tptr;
291 tlv_len = *(tptr+1);
292
293 ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV",
294 tok2str(vtp_vlan_tlv_values, "Unknown", type),
295 type));
296
283 /*
284 * infinite loop check
285 */
286 if (type == 0 || tlv_len == 0) {
297 if (len < tlv_len * 2 + 2) {
298 ND_PRINT((ndo, " (TLV goes past the end of the packet)"));
287 return;
288 }
299 return;
300 }
289
290 ND_TCHECK2(*tptr, tlv_len * 2 +2);
291
301 ND_TCHECK2(*tptr, tlv_len * 2 +2);
302
292 tlv_value = EXTRACT_16BITS(tptr+2);
303 /*
304 * We assume the value is a 2-byte integer; the length is
305 * in units of 16-bit words.
306 */
307 if (tlv_len != 1) {
308 ND_PRINT((ndo, " (invalid TLV length %u != 1)", tlv_len));
309 return;
310 } else {
311 tlv_value = EXTRACT_16BITS(tptr+2);
293
312
294 switch (type) {
295 case VTP_VLAN_STE_HOP_COUNT:
296 ND_PRINT((ndo, ", %u", tlv_value));
297 break;
313 switch (type) {
314 case VTP_VLAN_STE_HOP_COUNT:
315 ND_PRINT((ndo, ", %u", tlv_value));
316 break;
298
317
299 case VTP_VLAN_PRUNING:
300 ND_PRINT((ndo, ", %s (%u)",
301 tlv_value == 1 ? "Enabled" : "Disabled",
302 tlv_value));
303 break;
318 case VTP_VLAN_PRUNING:
319 ND_PRINT((ndo, ", %s (%u)",
320 tlv_value == 1 ? "Enabled" : "Disabled",
321 tlv_value));
322 break;
304
323
305 case VTP_VLAN_STP_TYPE:
306 ND_PRINT((ndo, ", %s (%u)",
307 tok2str(vtp_stp_type_values, "Unknown", tlv_value),
308 tlv_value));
309 break;
324 case VTP_VLAN_STP_TYPE:
325 ND_PRINT((ndo, ", %s (%u)",
326 tok2str(vtp_stp_type_values, "Unknown", tlv_value),
327 tlv_value));
328 break;
310
329
311 case VTP_VLAN_BRIDGE_TYPE:
312 ND_PRINT((ndo, ", %s (%u)",
313 tlv_value == 1 ? "SRB" : "SRT",
314 tlv_value));
315 break;
330 case VTP_VLAN_BRIDGE_TYPE:
331 ND_PRINT((ndo, ", %s (%u)",
332 tlv_value == 1 ? "SRB" : "SRT",
333 tlv_value));
334 break;
316
335
317 case VTP_VLAN_BACKUP_CRF_MODE:
318 ND_PRINT((ndo, ", %s (%u)",
319 tlv_value == 1 ? "Backup" : "Not backup",
320 tlv_value));
321 break;
336 case VTP_VLAN_BACKUP_CRF_MODE:
337 ND_PRINT((ndo, ", %s (%u)",
338 tlv_value == 1 ? "Backup" : "Not backup",
339 tlv_value));
340 break;
322
341
323 /*
324 * FIXME those are the defined TLVs that lack a decoder
325 * you are welcome to contribute code ;-)
326 */
342 /*
343 * FIXME those are the defined TLVs that lack a decoder
344 * you are welcome to contribute code ;-)
345 */
327
346
328 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
329 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
330 case VTP_VLAN_PARENT_VLAN:
331 case VTP_VLAN_TRANS_BRIDGED_VLAN:
332 case VTP_VLAN_ARP_HOP_COUNT:
333 default:
334 print_unknown_data(ndo, tptr, "\n\t\t ", 2 + tlv_len*2);
335 break;
347 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
348 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
349 case VTP_VLAN_PARENT_VLAN:
350 case VTP_VLAN_TRANS_BRIDGED_VLAN:
351 case VTP_VLAN_ARP_HOP_COUNT:
352 default:
353 print_unknown_data(ndo, tptr, "\n\t\t ", 2 + tlv_len*2);
354 break;
355 }
336 }
337 len -= 2 + tlv_len*2;
338 tptr += 2 + tlv_len*2;
339 }
340 }
341 break;
342
343 case VTP_ADV_REQUEST:

--- 40 unchanged lines hidden --- 		356 }
357 len -= 2 + tlv_len*2;
358 tptr += 2 + tlv_len*2;
359 }
360 }
361 break;
362
363 case VTP_ADV_REQUEST:

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