forked from osmocom/wireshark
2445e38d88
svn path=/trunk/; revision=27650
212 lines
6.3 KiB
C
212 lines
6.3 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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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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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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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-ieee8023.h"
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#include "packet-ipx.h"
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#include "packet-llc.h"
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#include "packet-vlan.h"
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#include <epan/etypes.h>
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#include <epan/prefs.h>
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void proto_reg_handoff_vlan(void);
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static unsigned int q_in_q_ethertype = 0x9100;
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static gboolean vlan_summary_in_tree = TRUE;
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static int proto_vlan = -1;
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static int hf_vlan_priority = -1;
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static int hf_vlan_cfi = -1;
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static int hf_vlan_id = -1;
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static int hf_vlan_etype = -1;
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static int hf_vlan_len = -1;
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static int hf_vlan_trailer = -1;
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static gint ett_vlan = -1;
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void
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capture_vlan(const guchar *pd, int offset, int len, packet_counts *ld ) {
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guint16 encap_proto;
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if ( !BYTES_ARE_IN_FRAME(offset,len,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(ld);
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} else {
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capture_llc(pd,offset+4,len,ld);
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}
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} else {
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capture_ethertype(encap_proto, pd, offset+4, len, ld);
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}
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}
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static void
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dissect_vlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *ti;
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guint16 tci;
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volatile guint16 encap_proto;
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volatile gboolean is_802_2;
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proto_tree *volatile vlan_tree;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "VLAN");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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tci = tvb_get_ntohs( tvb, 0 );
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "PRI: %u CFI: %u ID: %u",
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(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
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}
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if ( check_col(pinfo->cinfo, COL_8021Q_VLAN_ID)) {
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col_add_fstr(pinfo->cinfo, COL_8021Q_VLAN_ID, "%u", (tci & 0xFFF));
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}
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if ( check_col(pinfo->cinfo, COL_COS_VALUE)) {
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col_add_fstr(pinfo->cinfo, COL_COS_VALUE, "%u", (tci >> 13));
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}
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vlan_tree = NULL;
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if (tree) {
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ti = proto_tree_add_item(tree, proto_vlan, tvb, 0, 4, FALSE);
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if (vlan_summary_in_tree) {
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proto_item_append_text(ti, ", PRI: %u, CFI: %u, ID: %u",
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(tci >> 13), ((tci >> 12) & 1), (tci & 0xFFF));
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}
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vlan_tree = proto_item_add_subtree(ti, ett_vlan);
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proto_tree_add_item(vlan_tree, hf_vlan_priority, tvb, 0, 2, FALSE);
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proto_tree_add_item(vlan_tree, hf_vlan_cfi, tvb, 0, 2, FALSE);
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proto_tree_add_item(vlan_tree, hf_vlan_id, tvb, 0, 2, FALSE);
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}
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encap_proto = tvb_get_ntohs(tvb, 2);
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if (encap_proto <= IEEE_802_3_MAX_LEN) {
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/* Is there an 802.2 layer? I can tell by looking at the first 2
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bytes after the VLAN header. If they are 0xffff, then what
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follows the VLAN header is an IPX payload, meaning no 802.2.
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(IPX/SPX is they only thing that can be contained inside a
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straight 802.3 packet, so presumably the same applies for
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Ethernet VLAN packets). A non-0xffff value means that there's an
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802.2 layer inside the VLAN layer */
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is_802_2 = TRUE;
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TRY {
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if (tvb_get_ntohs(tvb, 4) == 0xffff) {
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is_802_2 = FALSE;
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}
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}
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CATCH2(BoundsError, ReportedBoundsError) {
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; /* do nothing */
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}
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ENDTRY;
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dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, vlan_tree,
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hf_vlan_len, hf_vlan_trailer, 0);
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} else {
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ethertype(encap_proto, tvb, 4, pinfo, tree, vlan_tree,
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hf_vlan_etype, hf_vlan_trailer, 0);
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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_priority, {
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"Priority", "vlan.priority", FT_UINT16, BASE_DEC,
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NULL, 0xE000, "User Priority", HFILL }},
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{ &hf_vlan_cfi, {
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"CFI", "vlan.cfi", FT_UINT16, BASE_DEC,
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NULL, 0x1000, "Canonical Format Identifier", HFILL }},
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{ &hf_vlan_id, {
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"ID", "vlan.id", FT_UINT16, BASE_DEC,
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NULL, 0x0FFF, "VLAN ID", HFILL }},
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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, "Ethertype", HFILL }},
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{ &hf_vlan_len, {
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"Length", "vlan.len", FT_UINT16, BASE_DEC,
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NULL, 0x0, NULL, HFILL }},
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{ &hf_vlan_trailer, {
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"Trailer", "vlan.trailer", FT_BYTES, BASE_NONE,
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NULL, 0x0, "VLAN Trailer", HFILL }}
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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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module_t *vlan_module;
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proto_vlan = proto_register_protocol("802.1Q Virtual LAN", "VLAN", "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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vlan_module = prefs_register_protocol(proto_vlan, proto_reg_handoff_vlan);
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prefs_register_bool_preference(vlan_module, "summary_in_tree",
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"Show vlan summary in protocol tree",
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"Whether the vlan summary line should be shown in the protocol tree",
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&vlan_summary_in_tree);
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prefs_register_uint_preference(vlan_module, "qinq_ethertype",
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"802.1QinQ Ethertype (in hex)",
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"The (hexadecimal) Ethertype used to indicate 802.1QinQ VLAN in VLAN tunneling.",
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16, &q_in_q_ethertype);
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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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static gboolean prefs_initialized = FALSE;
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static dissector_handle_t vlan_handle;
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static unsigned int old_q_in_q_ethertype;
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if (!prefs_initialized)
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{
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vlan_handle = create_dissector_handle(dissect_vlan, proto_vlan);
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dissector_add("ethertype", ETHERTYPE_VLAN, vlan_handle);
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prefs_initialized = TRUE;
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}
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else
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{
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dissector_delete("ethertype", old_q_in_q_ethertype, vlan_handle);
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}
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old_q_in_q_ethertype = q_in_q_ethertype;
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dissector_add("ethertype", q_in_q_ethertype, vlan_handle);
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}
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