forked from osmocom/wireshark
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/* packet-vlan.c
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* Routines for VLAN 802.1Q ethernet header disassembly
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*
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* $Id: packet-vlan.c,v 1.17 2000/06/15 03:48:43 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include "etypes.h"
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static int proto_vlan = -1;
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static int hf_vlan_etype = -1;
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static int hf_vlan_priority = -1;
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static int hf_vlan_id = -1;
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static int hf_vlan_cfi = -1;
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static gint ett_vlan = -1;
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void
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capture_vlan(const u_char *pd, int offset, packet_counts *ld ) {
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guint32 encap_proto;
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if ( !BYTES_ARE_IN_FRAME(offset,5) ) {
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ld->other++;
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return;
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}
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encap_proto = pntohs( &pd[offset+2] );
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if ( encap_proto <= IEEE_802_3_MAX_LEN) {
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if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
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capture_ipx(pd,offset+4,ld);
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} else {
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capture_llc(pd,offset+4,ld);
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}
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} else {
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capture_ethertype(encap_proto, offset+4, pd, ld);
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}
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}
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static void
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dissect_vlan(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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proto_tree *ti, *vlan_tree = NULL;
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guint16 tci,encap_proto;
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tvbuff_t *next_tvb;
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if (!BYTES_ARE_IN_FRAME(offset, 2*sizeof(guint16))) {
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return;
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}
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "VLAN");
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tci = pntohs( &pd[offset] );
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encap_proto = pntohs( &pd[offset+2] );
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "PRI: %d CFI: %d ID: %d",
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(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_vlan, NullTVB, offset, 4, FALSE);
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vlan_tree = proto_item_add_subtree(ti, ett_vlan);
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proto_tree_add_uint(vlan_tree, hf_vlan_priority, NullTVB, offset, 2, tci);
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proto_tree_add_uint(vlan_tree, hf_vlan_cfi, NullTVB, offset, 2, tci);
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proto_tree_add_uint(vlan_tree, hf_vlan_id, NullTVB, offset, 2, tci);
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}
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next_tvb = tvb_create_from_top(offset+4); /* XXX - should TRY() like dissect_eth() */
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if ( encap_proto <= IEEE_802_3_MAX_LEN) {
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if ( pd[offset+4] == 0xff && pd[offset+5] == 0xff ) {
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dissect_ipx(pd,offset+4,fd,tree);
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} else {
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dissect_llc(next_tvb, &pi, tree);
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}
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} else {
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ethertype(encap_proto, pi.compat_top_tvb, offset+4, &pi, tree, vlan_tree, hf_vlan_etype);
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}
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}
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void
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proto_register_vlan(void)
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{
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static hf_register_info hf[] = {
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{ &hf_vlan_etype, {
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"Type", "vlan.etype", FT_UINT16, BASE_HEX,
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VALS(etype_vals), 0x0, "Type" }},
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{ &hf_vlan_priority, {
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"Priority", "vlan.priority", FT_UINT16, BASE_BIN,
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0, 0xE000, "Priority" }},
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{ &hf_vlan_cfi, {
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"CFI", "vlan.cfi", FT_UINT16, BASE_BIN,
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0, 0x1000, "CFI" }},
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{ &hf_vlan_id, {
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"ID", "vlan.id", FT_UINT16, BASE_BIN,
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0, 0x0FFF, "ID" }},
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};
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static gint *ett[] = {
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&ett_vlan,
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};
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proto_vlan = proto_register_protocol("802.1q Virtual LAN", "vlan");
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proto_register_field_array(proto_vlan, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_vlan(void)
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{
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dissector_add("ethertype", ETHERTYPE_VLAN, dissect_vlan);
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}
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