forked from osmocom/wireshark
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* packet-pw-eth.c
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* Routines for ethernet PW dissection:
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* it should be conformance to RFC 4448.
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*
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* Copyright 2008 _FF_
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*
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* Francesco Fondelli <francesco dot fondelli, gmail dot com>
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "packet-mpls.h"
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static gint proto_pw_eth = -1;
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static gint proto_pw_eth_nocw = -1;
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static gint ett_pw_eth = -1;
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static int hf_pw_eth = -1;
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static int hf_pw_eth_cw = -1;
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static int hf_pw_eth_cw_sequence_number = -1;
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static hf_register_info hf[] = {
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{
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&hf_pw_eth,
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{
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"PW (ethernet)",
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"pweth", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_eth_cw,
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{
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"PW Control Word (ethernet)",
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"pweth.cw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_eth_cw_sequence_number,
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{
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"PW sequence number (ethernet)",
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"pweth.cw.sequence_number", FT_UINT16,
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BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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}
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};
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static gint *ett[] = {
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&ett_pw_eth
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};
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static dissector_handle_t eth_withoutfcs_handle;
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static void
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dissect_pw_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *pw_eth_tree = NULL;
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proto_item *ti = NULL;
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tvbuff_t *next_tvb = NULL;
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guint16 sequence_number = 0;
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if (tvb_reported_length_remaining(tvb, 0) < 4) {
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if (tree)
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proto_tree_add_text(tree, tvb, 0, -1,
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"Error processing Message");
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return;
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}
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sequence_number = tvb_get_ntohs(tvb, 2);
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if (tree) {
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ti = proto_tree_add_boolean(tree, hf_pw_eth_cw, tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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ti = proto_tree_add_item(tree, proto_pw_eth, tvb, 0, 4, FALSE);
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pw_eth_tree = proto_item_add_subtree(ti, ett_pw_eth);
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if (pw_eth_tree == NULL)
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return;
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proto_tree_add_uint_format(pw_eth_tree,
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hf_pw_eth_cw_sequence_number,
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tvb, 2, 2, sequence_number,
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"Sequence Number: %d",
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sequence_number);
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}
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next_tvb = tvb_new_subset(tvb, 4, -1, -1);
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call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
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}
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static void
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dissect_pw_eth_nocw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb = NULL;
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proto_item *ti = NULL;
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if (tree) {
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ti = proto_tree_add_boolean(tree, hf_pw_eth, tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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}
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next_tvb = tvb_new_subset(tvb, 0, -1, -1);
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call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
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}
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void
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proto_register_pw_eth(void)
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{
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proto_pw_eth = proto_register_protocol("PW Control Word (ethernet)",
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"PWETH", "pweth");
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proto_pw_eth_nocw = proto_register_protocol("PW (ethernet)",
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"PWETH (no CW)",
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"");
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proto_register_field_array(proto_pw_eth, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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register_dissector("pw_eth", dissect_pw_eth, proto_pw_eth);
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register_dissector("pw_eth_nocw", dissect_pw_eth_nocw,
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proto_pw_eth_nocw);
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}
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void
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proto_reg_handoff_pw_eth(void)
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{
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dissector_handle_t pw_eth_handle;
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dissector_handle_t pw_eth_handle_nocw;
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eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
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pw_eth_handle = create_dissector_handle(dissect_pw_eth, proto_pw_eth);
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dissector_add("mpls.label", LABEL_INVALID, pw_eth_handle);
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pw_eth_handle_nocw = create_dissector_handle(dissect_pw_eth_nocw,
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proto_pw_eth_nocw);
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dissector_add("mpls.label", LABEL_INVALID, pw_eth_handle_nocw);
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}
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