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/* packet-vlan.c
* Routines for VLAN 802.1Q ethernet header disassembly
*
* $Id: packet-vlan.c,v 1.4 1999/11/16 11:43:02 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#include "packet.h"
static int proto_vlan = -1;
static int hf_vlan_etype = -1;
static int hf_vlan_priority = -1;
static int hf_vlan_id = -1;
static int hf_vlan_cfi = -1;
static gint ett_vlan = -1;
void
dissect_vlan(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *ti, *vlan_tree = NULL;
guint16 tci,encap_proto;
if (!BYTES_ARE_IN_FRAME(offset, 2*sizeof(guint16))) {
return;
}
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "VLAN");
tci = pntohs( &pd[offset] );
encap_proto = pntohs( &pd[offset+2] );
if (check_col(fd, COL_INFO)) {
col_add_fstr(fd, COL_INFO, "PRI: %d CFI: %d ID: %d",
(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
}
if (tree) {
ti = proto_tree_add_item(tree, proto_vlan, offset, 4);
vlan_tree = proto_item_add_subtree(ti, ett_vlan);
proto_tree_add_item(vlan_tree, hf_vlan_priority, offset, 2, tci);
proto_tree_add_item(vlan_tree, hf_vlan_cfi, offset, 2, tci);
proto_tree_add_item(vlan_tree, hf_vlan_id, offset, 2, tci);
}
ethertype(encap_proto, offset+4, pd, fd, tree, vlan_tree, hf_vlan_etype);
}
void
proto_register_vlan(void)
{
static hf_register_info hf[] = {
{ &hf_vlan_etype, {
"Type", "vlan.etype", FT_UINT16, BASE_HEX,
VALS(etype_vals), 0x0, "Type" }},
{ &hf_vlan_priority, {
"Priority", "vlan.priority", FT_UINT16, BASE_BIN,
0, 0xE000, "Priority" }},
{ &hf_vlan_cfi, {
"CFI", "vlan.cfi", FT_UINT16, BASE_BIN,
0, 0x1000, "CFI" }},
{ &hf_vlan_id, {
"ID", "vlan.id", FT_UINT16, BASE_BIN,
0, 0x0FFF, "ID" }},
};
static gint *ett[] = {
&ett_vlan,
};
proto_vlan = proto_register_protocol("802.1q Virtual LAN", "vlan");
proto_register_field_array(proto_vlan, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
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