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📄 CHANGES(57.87 KB)
📄 CONTRIBUTING(5.93 KB)
📄 CREDITS(14.57 KB)
📄 INSTALL.txt(5.25 KB)
📄 LICENSE(873 B)
📄 Makefile-devel-adds(614 B)
📄 Makefile.in(9.96 KB)
📄 PLATFORMS(567 B)
📄 README(9.04 KB)
📄 README.md(9.04 KB)
📄 VERSION(6 B)
📄 addrtoname.c(33.19 KB)
📄 addrtoname.h(2.78 KB)
📄 addrtostr.c(5.64 KB)
📄 addrtostr.h(2.03 KB)
📄 af.c(1.96 KB)
📄 af.h(1.81 KB)
📄 ah.h(2.34 KB)
📄 appletalk.h(4.06 KB)
📄 ascii_strcasecmp.c(3.5 KB)
📄 ascii_strcasecmp.h(1.49 KB)
📄 atime.awk(529 B)
📄 atm.h(1.14 KB)
📄 bpf_dump.c(1.9 KB)
📄 chdlc.h(1.31 KB)
📄 checksum.c(5.25 KB)
📄 config.guess(43.17 KB)
📄 config.h.in(11.19 KB)
📄 config.sub(34.93 KB)
📄 configure(255.88 KB)
📄 configure.ac(25.05 KB)
📄 configure.in(25.66 KB)
📄 cpack.c(3.92 KB)
📄 cpack.h(2.37 KB)
📄 ether.h(2.34 KB)
📄 ethertype.h(5.58 KB)
📄 extract.h(11.48 KB)
📄 funcattrs.h(4.42 KB)
📄 getopt_long.h(2.52 KB)
📄 gmpls.c(5.82 KB)
📄 gmpls.h(1.38 KB)
📄 gmt2local.c(2.01 KB)
📄 gmt2local.h(1.21 KB)
📄 in_cksum.c(6.44 KB)
📄 install-sh(5.45 KB)
📄 interface.h(2.29 KB)
📄 ip.h(5.75 KB)
📄 ip6.h(7.6 KB)
📄 ipproto.c(16.49 KB)
📄 ipproto.h(4.72 KB)
📄 l2vpn.c(3.36 KB)
📄 l2vpn.h(781 B)
📁 lbl
📄 llc.h(3.72 KB)
📄 machdep.c(2.58 KB)
📄 machdep.h(1.24 KB)
📄 makemib(6.41 KB)
📄 mib.h(26.33 KB)
📁 missing
📄 mkdep(2.43 KB)
📄 mpls.h(1.93 KB)
📄 nameser.h(10.8 KB)
📄 netdissect-stdinc.h(9.93 KB)
📄 netdissect.c(3.38 KB)
📄 netdissect.h(30.13 KB)
📄 nfs.h(13.37 KB)
📄 nfsfh.h(2.57 KB)
📄 nlpid.c(1.27 KB)
📄 nlpid.h(1.3 KB)
📄 openflow.h(2.14 KB)
📄 ospf.h(10.21 KB)
📄 oui.c(3.83 KB)
📄 oui.h(4.06 KB)
📄 packetdat.awk(1.39 KB)
📄 parsenfsfh.c(12.87 KB)
📄 pcap-missing.h(1.8 KB)
📄 pcap_dump_ftell.c(1.29 KB)
📄 ppp.h(3.07 KB)
📄 print-802_11.c(91.47 KB)
📄 print-802_15_4.c(5.5 KB)
📄 print-ah.c(2.02 KB)
📄 print-ahcp.c(10.73 KB)
📄 print-aodv.c(15.98 KB)
📄 print-aoe.c(11.13 KB)
📄 print-ap1394.c(4 KB)
📄 print-arcnet.c(8.83 KB)
📄 print-arp.c(14.57 KB)
📄 print-ascii.c(6.23 KB)
📄 print-atalk.c(16.76 KB)
📄 print-atm.c(16.81 KB)
📄 print-babel.c(23.79 KB)
📄 print-beep.c(1.71 KB)
📄 print-bfd.c(16.5 KB)
📄 print-bgp.c(99.77 KB)
📄 print-bootp.c(30.07 KB)
📄 print-bt.c(2.21 KB)
📄 print-calm-fast.c(1.81 KB)
📄 print-carp.c(2.43 KB)
📄 print-cdp.c(11.16 KB)
📄 print-cfm.c(24.19 KB)
📄 print-chdlc.c(5.88 KB)
📄 print-cip.c(2.5 KB)
📄 print-cnfp.c(13.69 KB)
📄 print-dccp.c(17.75 KB)
📄 print-decnet.c(37.63 KB)
📄 print-dhcp6.c(23.22 KB)
📄 print-domain.c(18.44 KB)
📄 print-dtp.c(3.03 KB)
📄 print-dvmrp.c(8.98 KB)
📄 print-eap.c(9.26 KB)
📄 print-egp.c(8.69 KB)
📄 print-eigrp.c(19.49 KB)
📄 print-enc.c(4.2 KB)
📄 print-esp.c(21.46 KB)
📄 print-ether.c(12.91 KB)
📄 print-fddi.c(10.51 KB)
📄 print-forces.c(45.01 KB)
📄 print-fr.c(31.99 KB)
📄 print-frag6.c(2.36 KB)
📄 print-ftp.c(973 B)
📄 print-geneve.c(6.13 KB)
📄 print-geonet.c(6.72 KB)
📄 print-gre.c(9.72 KB)
📄 print-hncp.c(26.39 KB)
📄 print-hsrp.c(4.57 KB)
📄 print-http.c(1.51 KB)
📄 print-icmp.c(22.7 KB)
📄 print-icmp6.c(59.81 KB)
📄 print-igmp.c(10.05 KB)
📄 print-igrp.c(4.64 KB)
📄 print-ip.c(17.04 KB)
📄 print-ip6.c(10.57 KB)
📄 print-ip6opts.c(5.53 KB)
📄 print-ipcomp.c(2.32 KB)
📄 print-ipfc.c(4.41 KB)
📄 print-ipnet.c(2.78 KB)
📄 print-ipx.c(6.42 KB)
📄 print-isakmp.c(81.72 KB)
📄 print-isoclns.c(107.61 KB)
📄 print-juniper.c(48.42 KB)
📄 print-krb.c(6.26 KB)
📄 print-l2tp.c(23.94 KB)
📄 print-lane.c(3.04 KB)
📄 print-ldp.c(24.35 KB)
📄 print-lisp.c(15.23 KB)
📄 print-llc.c(16.68 KB)
📄 print-lldp.c(57.26 KB)
📄 print-lmp.c(38.11 KB)
📄 print-loopback.c(3.63 KB)
📄 print-lspping.c(51.64 KB)
📄 print-lwapp.c(13.01 KB)
📄 print-lwres.c(14.08 KB)
📄 print-m3ua.c(10.92 KB)
📄 print-medsa.c(5.57 KB)
📄 print-mobile.c(3.28 KB)
📄 print-mobility.c(9.74 KB)
📄 print-mpcp.c(7.87 KB)
📄 print-mpls.c(5.31 KB)
📄 print-mptcp.c(13.68 KB)
📄 print-msdp.c(2.69 KB)
📄 print-msnlb.c(2.39 KB)
📄 print-nflog.c(4.4 KB)
📄 print-nfs.c(42.84 KB)
📄 print-nsh.c(5.39 KB)
📄 print-ntp.c(13.34 KB)
📄 print-null.c(4.01 KB)
📄 print-olsr.c(23.42 KB)
📄 print-openflow-1.0.c(76.63 KB)
📄 print-openflow.c(4.77 KB)
📄 print-ospf.c(39.49 KB)
📄 print-ospf6.c(29.86 KB)
📄 print-otv.c(2.1 KB)
📄 print-pflog.c(4.86 KB)
📄 print-pfsync.c(12.53 KB)
📄 print-pgm.c(22.17 KB)
📄 print-pim.c(32.59 KB)
📄 print-pktap.c(5.18 KB)
📄 print-ppi.c(2.68 KB)
📄 print-ppp.c(46.16 KB)
📄 print-pppoe.c(5.65 KB)
📄 print-pptp.c(25.9 KB)
📄 print-radius.c(35.1 KB)
📄 print-raw.c(1.52 KB)
📄 print-resp.c(16.5 KB)
📄 print-rip.c(9.19 KB)
📄 print-ripng.c(6 KB)
📄 print-rpki-rtr.c(10.83 KB)
📄 print-rrcp.c(4.56 KB)
📄 print-rsvp.c(78.61 KB)
📄 print-rt6.c(2.66 KB)
📄 print-rtsp.c(1.16 KB)
📄 print-rx.c(66.92 KB)
📄 print-sctp.c(23.13 KB)
📄 print-sflow.c(31.91 KB)
📄 print-sip.c(1.29 KB)
📄 print-sl.c(6.95 KB)
📄 print-sll.c(9.2 KB)
📄 print-slow.c(25.17 KB)
📄 print-smb.c(43.19 KB)
📄 print-smtp.c(983 B)
📄 print-snmp.c(43.17 KB)
📄 print-stp.c(17.18 KB)
📄 print-sunatm.c(3.27 KB)
📄 print-sunrpc.c(7.85 KB)
📄 print-symantec.c(3.78 KB)
📄 print-syslog.c(3.96 KB)
📄 print-tcp.c(35.84 KB)
📄 print-telnet.c(15.02 KB)
📄 print-tftp.c(5.2 KB)
📄 print-timed.c(4.74 KB)
📄 print-tipc.c(11.53 KB)
📄 print-token.c(7.96 KB)
📄 print-udld.c(5.47 KB)
📄 print-udp.c(21.28 KB)
📄 print-usb.c(4.18 KB)
📄 print-vjc.c(4.45 KB)
📄 print-vqp.c(6.8 KB)
📄 print-vrrp.c(6.37 KB)
📄 print-vtp.c(13.56 KB)
📄 print-vxlan-gpe.c(3.46 KB)
📄 print-vxlan.c(2.21 KB)
📄 print-wb.c(10.93 KB)
📄 print-zephyr.c(8.03 KB)
📄 print-zeromq.c(7.5 KB)
📄 print.c(11.54 KB)
📄 print.h(1.78 KB)
📄 rpc_auth.h(2.77 KB)
📄 rpc_msg.h(3.19 KB)
📄 rpl.h(4.88 KB)
📄 send-ack.awk(1.56 KB)
📄 setsignal.c(3.27 KB)
📄 setsignal.h(1.24 KB)
📄 signature.c(5.58 KB)
📄 signature.h(1.12 KB)
📄 slcompress.h(3.55 KB)
📄 smb.h(5.38 KB)
📄 smbutil.c(63.88 KB)
📄 stime.awk(567 B)
📄 strtoaddr.c(5.34 KB)
📄 strtoaddr.h(992 B)
📄 tcp.h(5.02 KB)
📄 tcpdump.1.in(60.82 KB)
📄 tcpdump.c(69.76 KB)
📄 timeval-operations.h(3.19 KB)
📄 udp.h(8.25 KB)
📄 util-print.c(23.75 KB)
📄 vfprintf.c(1.62 KB)

Editing: print-vtp.c

/*
 * 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.
 *
 * Reference documentation:
 *  http://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558-21.html
 *  http://docstore.mik.ua/univercd/cc/td/doc/product/lan/trsrb/frames.htm
 *
 * Original code ode by Carles Kishimoto <carles.kishimoto@gmail.com>
 */

/* \summary: Cisco VLAN Trunking Protocol (VTP) printer */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <netdissect-stdinc.h>

#include "netdissect.h"
#include "addrtoname.h"
#include "extract.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_FIXED_PART_LEN	12	/* length of VLAN info before VLAN name */

#define VTP_SUMMARY_ADV			0x01
#define VTP_SUBSET_ADV			0x02
#define VTP_ADV_REQUEST			0x03
#define VTP_JOIN_MESSAGE		0x04

struct vtp_vlan_ {
    uint8_t  len;
    uint8_t  status;
    uint8_t  type;
    uint8_t  name_len;
    uint16_t vlanid;
    uint16_t mtu;
    uint32_t index;
};

static const 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 const 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 const struct tok vtp_vlan_type_values[] = {
    { 0x01, "Ethernet"},
    { 0x02, "FDDI"},
    { 0x03, "TrCRF"},
    { 0x04, "FDDI-net"},
    { 0x05, "TrBRF"},
    { 0, NULL }
};

static const 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 const 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 const struct tok vtp_stp_type_values[] = {
    { 1, "SRT"},
    { 2, "SRB"},
    { 3, "Auto"},
    { 0, NULL }
};

void
vtp_print (netdissect_options *ndo,
           const u_char *pptr, u_int length)
{
    int type, len, tlv_len, tlv_value, mgmtd_len;
    const u_char *tptr;
    const struct vtp_vlan_ *vtp_vlan;

if (length < VTP_HEADER_LEN)
        goto trunc;

tptr = pptr;

ND_TCHECK2(*tptr, VTP_HEADER_LEN);

type = *(tptr+1);
    ND_PRINT((ndo, "VTPv%u, Message %s (0x%02x), length %u",
	   *tptr,
	   tok2str(vtp_message_type_values,"Unknown message type", type),
	   type,
	   length));

/* In non-verbose mode, just print version and message type */
    if (ndo->ndo_vflag < 1) {
        return;
    }

/* verbose mode print all fields */
    ND_PRINT((ndo, "\n\tDomain name: "));
    mgmtd_len = *(tptr + 3);
    if (mgmtd_len < 1 ||  mgmtd_len > 32) {
	ND_PRINT((ndo, " [invalid MgmtD Len %d]", mgmtd_len));
	return;
    }
    fn_printzp(ndo, tptr + 4, mgmtd_len, NULL);
    ND_PRINT((ndo, ", %s: %u",
	   tok2str(vtp_header_values, "Unknown", type),
	   *(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  |    MgmtD Len  |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |       Management Domain Name  (zero-padded to 32 bytes)       |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                    Configuration revision number              |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                  Updater Identity IP address                  |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                    Update Timestamp (12 bytes)                |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                        MD5 digest (16 bytes)                  |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *
	 */

ND_TCHECK2(*tptr, 8);
	ND_PRINT((ndo, "\n\t  Config Rev %x, Updater %s",
	       EXTRACT_32BITS(tptr),
	       ipaddr_string(ndo, tptr+4)));
	tptr += 8;
	ND_TCHECK2(*tptr, VTP_UPDATE_TIMESTAMP_LEN);
	ND_PRINT((ndo, ", Timestamp 0x%08x 0x%08x 0x%08x",
	       EXTRACT_32BITS(tptr),
	       EXTRACT_32BITS(tptr + 4),
	       EXTRACT_32BITS(tptr + 8)));
	tptr += VTP_UPDATE_TIMESTAMP_LEN;
	ND_TCHECK2(*tptr, VTP_MD5_DIGEST_LEN);
	ND_PRINT((ndo, ", 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  |    MgmtD Len  |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |       Management Domain Name  (zero-padded to 32 bytes)       |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                    Configuration revision number              |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                         VLAN info field 1                     |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                         ................                      |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                         VLAN info field N                     |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *
	 */

ND_TCHECK_32BITS(tptr);
	ND_PRINT((ndo, ", 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 ((unsigned)(tptr - pptr) < length) {

ND_TCHECK_8BITS(tptr);
	    len = *tptr;
	    if (len == 0)
		break;

ND_TCHECK2(*tptr, len);

vtp_vlan = (const struct vtp_vlan_*)tptr;
	    if (len < VTP_VLAN_INFO_FIXED_PART_LEN)
		goto trunc;
	    ND_TCHECK(*vtp_vlan);
	    ND_PRINT((ndo, "\n\tVLAN info status %s, type %s, VLAN-id %u, MTU %u, SAID 0x%08x, Name ",
		   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)));
	    len  -= VTP_VLAN_INFO_FIXED_PART_LEN;
	    tptr += VTP_VLAN_INFO_FIXED_PART_LEN;
	    if (len < 4*((vtp_vlan->name_len + 3)/4))
		goto trunc;
	    ND_TCHECK2(*tptr, vtp_vlan->name_len);
	    fn_printzp(ndo, tptr, vtp_vlan->name_len, NULL);

/*
	     * Vlan names are aligned to 32-bit boundaries.
	     */
	    len  -= 4*((vtp_vlan->name_len + 3)/4);
	    tptr += 4*((vtp_vlan->name_len + 3)/4);

/* TLV information follows */

while (len > 0) {

/*
                 * Cisco specs say 2 bytes for type + 2 bytes for length;
                 * see http://docstore.mik.ua/univercd/cc/td/doc/product/lan/trsrb/frames.htm
                 * However, actual packets on the wire appear to use 1
                 * byte for the type and 1 byte for the length, so that's
                 * what we do.
                 */
                if (len < 2)
                    goto trunc;
                ND_TCHECK2(*tptr, 2);
                type = *tptr;
                tlv_len = *(tptr+1);

ND_PRINT((ndo, "\n\t\t%s (0x%04x) TLV",
                       tok2str(vtp_vlan_tlv_values, "Unknown", type),
                       type));

if (len < tlv_len * 2 + 2) {
                    ND_PRINT((ndo, " (TLV goes past the end of the packet)"));
                    return;
                }
                ND_TCHECK2(*tptr, tlv_len * 2 +2);

/*
                 * We assume the value is a 2-byte integer; the length is
                 * in units of 16-bit words.
                 */
                if (tlv_len != 1) {
                    ND_PRINT((ndo, " (invalid TLV length %u != 1)", tlv_len));
                    return;
                } else {
                    tlv_value = EXTRACT_16BITS(tptr+2);

switch (type) {
                    case VTP_VLAN_STE_HOP_COUNT:
                        ND_PRINT((ndo, ", %u", tlv_value));
                        break;

case VTP_VLAN_PRUNING:
                        ND_PRINT((ndo, ", %s (%u)",
                               tlv_value == 1 ? "Enabled" : "Disabled",
                               tlv_value));
                        break;

case VTP_VLAN_STP_TYPE:
                        ND_PRINT((ndo, ", %s (%u)",
                               tok2str(vtp_stp_type_values, "Unknown", tlv_value),
                               tlv_value));
                        break;

case VTP_VLAN_BRIDGE_TYPE:
                        ND_PRINT((ndo, ", %s (%u)",
                               tlv_value == 1 ? "SRB" : "SRT",
                               tlv_value));
                        break;

case VTP_VLAN_BACKUP_CRF_MODE:
                        ND_PRINT((ndo, ", %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(ndo, 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    |    MgmtD Len  |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |       Management Domain Name  (zero-padded to 32 bytes)       |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *  |                          Start value                          |
	 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	 *
	 */

ND_TCHECK2(*tptr, 4);
	ND_PRINT((ndo, "\n\tStart value: %u", EXTRACT_32BITS(tptr)));
	break;

case VTP_JOIN_MESSAGE:

/* FIXME - Could not find message format */
	break;

default:
	break;
    }

return;

trunc:
    ND_PRINT((ndo, "[|vtp]"));
}

/*
 * Local Variables:
 * c-style: whitesmith
 * c-basic-offset: 4
 * End:
 */

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