2 * Copyright (c) 1998-2007 The TCPDUMP project
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.
15 * VLAN TRUNKING PROTOCOL (VTP)
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
22 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
29 #include <tcpdump-stdinc.h>
34 #include "interface.h"
35 #include "addrtoname.h"
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
45 #define VTP_SUMMARY_ADV 0x01
46 #define VTP_SUBSET_ADV 0x02
47 #define VTP_ADV_REQUEST 0x03
48 #define VTP_JOIN_MESSAGE 0x04
60 static 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"},
68 static 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 */
76 static struct tok vtp_vlan_type_values[] = {
85 static struct tok vtp_vlan_status[] = {
86 { 0x00, "Operational"},
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
102 static 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"},
116 static struct tok vtp_stp_type_values[] = {
124 vtp_print (const u_char *pptr, u_int length)
126 int type, len, tlv_len, tlv_value;
128 const struct vtp_vlan_ *vtp_vlan;
130 if (length < VTP_HEADER_LEN)
135 if (!TTEST2(*tptr, VTP_HEADER_LEN))
139 printf("VTPv%u, Message %s (0x%02x), length %u",
141 tok2str(vtp_message_type_values,"Unknown message type", type),
145 /* In non-verbose mode, just print version and message type */
150 /* verbose mode print all fields */
151 printf("\n\tDomain name: %s, %s: %u",
153 tok2str(vtp_header_values,"Unknown",*(tptr+1)),
156 tptr += VTP_HEADER_LEN;
160 case VTP_SUMMARY_ADV:
163 * SUMMARY ADVERTISEMENT
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
182 printf("\n\t Config Rev %x, Updater %s",
183 EXTRACT_32BITS(tptr),
184 ipaddr_string(tptr+4));
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;
202 * SUBSET ADVERTISEMENT
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
221 printf(", Config Rev %x", EXTRACT_32BITS(tptr));
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
234 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
239 while (tptr < (pptr+length)) {
245 if (!TTEST2(*tptr, len))
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));
258 * Vlan names are aligned to 32-bit boundaries.
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);
263 /* TLV information follows */
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
274 printf("\n\t\t%s (0x%04x) TLV",
275 tok2str(vtp_vlan_tlv_values, "Unknown", type),
279 * infinite loop check
281 if (type == 0 || tlv_len == 0) {
285 if (!TTEST2(*tptr, tlv_len*2 +2))
288 tlv_value = EXTRACT_16BITS(tptr+2);
291 case VTP_VLAN_STE_HOP_COUNT:
292 printf(", %u", tlv_value);
295 case VTP_VLAN_PRUNING:
297 tlv_value == 1 ? "Enabled" : "Disabled",
301 case VTP_VLAN_STP_TYPE:
303 tok2str(vtp_stp_type_values, "Unknown", tlv_value),
307 case VTP_VLAN_BRIDGE_TYPE:
309 tlv_value == 1 ? "SRB" : "SRT",
313 case VTP_VLAN_BACKUP_CRF_MODE:
315 tlv_value == 1 ? "Backup" : "Not backup",
320 * FIXME those are the defined TLVs that lack a decoder
321 * you are welcome to contribute code ;-)
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:
330 print_unknown_data(tptr, "\n\t\t ", 2 + tlv_len*2);
333 len -= 2 + tlv_len*2;
334 tptr += 2 + tlv_len*2;
339 case VTP_ADV_REQUEST:
342 * ADVERTISEMENT REQUEST
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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
351 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
355 printf("\n\tStart value: %u", EXTRACT_32BITS(tptr));
358 case VTP_JOIN_MESSAGE:
360 /* FIXME - Could not find message format */
375 * c-style: whitesmith