/* * 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		0x04struct 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                 0x0Astatic 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 }};voidvtp_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: */