Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 378 lines (320 sloc) 12.406 kb
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:
*/
Something went wrong with that request. Please try again.