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>
25 #define NETDISSECT_REWORKED
30 #include <tcpdump-stdinc.h>
32 #include "interface.h"
33 #include "addrtoname.h"
36 #define VTP_HEADER_LEN 36
37 #define VTP_DOMAIN_NAME_LEN 32
38 #define VTP_MD5_DIGEST_LEN 16
39 #define VTP_UPDATE_TIMESTAMP_LEN 12
40 #define VTP_VLAN_INFO_OFFSET 12
42 #define VTP_SUMMARY_ADV 0x01
43 #define VTP_SUBSET_ADV 0x02
44 #define VTP_ADV_REQUEST 0x03
45 #define VTP_JOIN_MESSAGE 0x04
57 static const struct tok vtp_message_type_values[] = {
58 { VTP_SUMMARY_ADV, "Summary advertisement"},
59 { VTP_SUBSET_ADV, "Subset advertisement"},
60 { VTP_ADV_REQUEST, "Advertisement request"},
61 { VTP_JOIN_MESSAGE, "Join message"},
65 static const struct tok vtp_header_values[] = {
66 { 0x01, "Followers"}, /* On Summary advertisement, 3rd byte is Followers */
67 { 0x02, "Seq number"}, /* On Subset advertisement, 3rd byte is Sequence number */
68 { 0x03, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
69 { 0x04, "Rsvd"}, /* On Adver. requests 3rd byte is Rsvd */
73 static const struct tok vtp_vlan_type_values[] = {
82 static const struct tok vtp_vlan_status[] = {
83 { 0x00, "Operational"},
88 #define VTP_VLAN_SOURCE_ROUTING_RING_NUMBER 0x01
89 #define VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER 0x02
90 #define VTP_VLAN_STP_TYPE 0x03
91 #define VTP_VLAN_PARENT_VLAN 0x04
92 #define VTP_VLAN_TRANS_BRIDGED_VLAN 0x05
93 #define VTP_VLAN_PRUNING 0x06
94 #define VTP_VLAN_BRIDGE_TYPE 0x07
95 #define VTP_VLAN_ARP_HOP_COUNT 0x08
96 #define VTP_VLAN_STE_HOP_COUNT 0x09
97 #define VTP_VLAN_BACKUP_CRF_MODE 0x0A
99 static const struct tok vtp_vlan_tlv_values[] = {
100 { VTP_VLAN_SOURCE_ROUTING_RING_NUMBER, "Source-Routing Ring Number TLV"},
101 { VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER, "Source-Routing Bridge Number TLV"},
102 { VTP_VLAN_STP_TYPE, "STP type TLV"},
103 { VTP_VLAN_PARENT_VLAN, "Parent VLAN TLV"},
104 { VTP_VLAN_TRANS_BRIDGED_VLAN, "Translationally bridged VLANs TLV"},
105 { VTP_VLAN_PRUNING, "Pruning TLV"},
106 { VTP_VLAN_BRIDGE_TYPE, "Bridge Type TLV"},
107 { VTP_VLAN_ARP_HOP_COUNT, "Max ARP Hop Count TLV"},
108 { VTP_VLAN_STE_HOP_COUNT, "Max STE Hop Count TLV"},
109 { VTP_VLAN_BACKUP_CRF_MODE, "Backup CRF Mode TLV"},
113 static const struct tok vtp_stp_type_values[] = {
121 vtp_print (netdissect_options *ndo,
122 const u_char *pptr, u_int length)
124 int type, len, tlv_len, tlv_value;
126 const struct vtp_vlan_ *vtp_vlan;
128 if (length < VTP_HEADER_LEN)
133 ND_TCHECK2(*tptr, VTP_HEADER_LEN);
136 ND_PRINT((ndo, "VTPv%u, Message %s (0x%02x), length %u",
138 tok2str(vtp_message_type_values,"Unknown message type", type),
142 /* In non-verbose mode, just print version and message type */
143 if (ndo->ndo_vflag < 1) {
147 /* verbose mode print all fields */
148 ND_PRINT((ndo, "\n\tDomain name: %s, %s: %u",
150 tok2str(vtp_header_values,"Unknown",*(tptr+1)),
153 tptr += VTP_HEADER_LEN;
157 case VTP_SUMMARY_ADV:
160 * SUMMARY ADVERTISEMENT
162 * 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
163 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 * | Version | Code | Followers | MmgtD Len |
165 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
166 * | Management Domain Name |
167 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
168 * | Configuration revision number |
169 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
170 * | Updater Identity IP address |
171 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
172 * | Update Timestamp (12 bytes) |
173 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
174 * | MD5 digest (16 bytes) |
175 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
179 ND_PRINT((ndo, "\n\t Config Rev %x, Updater %s",
180 EXTRACT_32BITS(tptr),
181 ipaddr_string(ndo, tptr+4)));
183 ND_PRINT((ndo, ", Timestamp 0x%08x 0x%08x 0x%08x",
184 EXTRACT_32BITS(tptr),
185 EXTRACT_32BITS(tptr + 4),
186 EXTRACT_32BITS(tptr + 8)));
187 tptr += VTP_UPDATE_TIMESTAMP_LEN;
188 ND_PRINT((ndo, ", MD5 digest: %08x%08x%08x%08x",
189 EXTRACT_32BITS(tptr),
190 EXTRACT_32BITS(tptr + 4),
191 EXTRACT_32BITS(tptr + 8),
192 EXTRACT_32BITS(tptr + 12)));
193 tptr += VTP_MD5_DIGEST_LEN;
199 * SUBSET ADVERTISEMENT
201 * 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
202 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
203 * | Version | Code | Seq number | MmgtD Len |
204 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
205 * | Management Domain Name |
206 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
207 * | Configuration revision number |
208 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
209 * | VLAN info field 1 |
210 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
211 * | ................ |
212 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
213 * | VLAN info field N |
214 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
218 ND_PRINT((ndo, ", Config Rev %x", EXTRACT_32BITS(tptr)));
222 * 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
223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
224 * | V info len | Status | VLAN type | VLAN name len |
225 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
226 * | ISL vlan id | MTU size |
227 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
228 * | 802.10 index (SAID) |
229 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
231 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
236 while (tptr < (pptr+length)) {
242 ND_TCHECK2(*tptr, len);
244 vtp_vlan = (struct vtp_vlan_*)tptr;
245 ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name %s",
246 tok2str(vtp_vlan_status,"Unknown",vtp_vlan->status),
247 tok2str(vtp_vlan_type_values,"Unknown",vtp_vlan->type),
248 EXTRACT_16BITS(&vtp_vlan->vlanid),
249 EXTRACT_16BITS(&vtp_vlan->mtu),
250 EXTRACT_32BITS(&vtp_vlan->index),
251 (tptr + VTP_VLAN_INFO_OFFSET)));
254 * Vlan names are aligned to 32-bit boundaries.
256 len -= VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
257 tptr += VTP_VLAN_INFO_OFFSET + 4*((vtp_vlan->name_len + 3)/4);
259 /* TLV information follows */
264 * Cisco specs says 2 bytes for type + 2 bytes for length, take only 1
265 * See: http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
270 ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV",
271 tok2str(vtp_vlan_tlv_values, "Unknown", type),
275 * infinite loop check
277 if (type == 0 || tlv_len == 0) {
281 ND_TCHECK2(*tptr, tlv_len * 2 +2);
283 tlv_value = EXTRACT_16BITS(tptr+2);
286 case VTP_VLAN_STE_HOP_COUNT:
287 ND_PRINT((ndo, ", %u", tlv_value));
290 case VTP_VLAN_PRUNING:
291 ND_PRINT((ndo, ", %s (%u)",
292 tlv_value == 1 ? "Enabled" : "Disabled",
296 case VTP_VLAN_STP_TYPE:
297 ND_PRINT((ndo, ", %s (%u)",
298 tok2str(vtp_stp_type_values, "Unknown", tlv_value),
302 case VTP_VLAN_BRIDGE_TYPE:
303 ND_PRINT((ndo, ", %s (%u)",
304 tlv_value == 1 ? "SRB" : "SRT",
308 case VTP_VLAN_BACKUP_CRF_MODE:
309 ND_PRINT((ndo, ", %s (%u)",
310 tlv_value == 1 ? "Backup" : "Not backup",
315 * FIXME those are the defined TLVs that lack a decoder
316 * you are welcome to contribute code ;-)
319 case VTP_VLAN_SOURCE_ROUTING_RING_NUMBER:
320 case VTP_VLAN_SOURCE_ROUTING_BRIDGE_NUMBER:
321 case VTP_VLAN_PARENT_VLAN:
322 case VTP_VLAN_TRANS_BRIDGED_VLAN:
323 case VTP_VLAN_ARP_HOP_COUNT:
325 print_unknown_data(ndo, tptr, "\n\t\t ", 2 + tlv_len*2);
328 len -= 2 + tlv_len*2;
329 tptr += 2 + tlv_len*2;
334 case VTP_ADV_REQUEST:
337 * ADVERTISEMENT REQUEST
339 * 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
340 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
341 * | Version | Code | Reserved | MmgtD Len |
342 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
343 * | Management Domain Name |
344 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
346 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
350 ND_PRINT((ndo, "\n\tStart value: %u", EXTRACT_32BITS(tptr)));
353 case VTP_JOIN_MESSAGE:
355 /* FIXME - Could not find message format */
365 ND_PRINT((ndo, "[|vtp]"));
370 * c-style: whitesmith