2012-01-19 02:58:53 +00:00
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/* Routines for MAC LTE format files with context info as header.
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*
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* Martin Mathieson
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2012-01-19 02:58:53 +00:00
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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 <epan/packet.h>
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#include "packet-mac-lte.h"
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/* Initialize the protocol and registered fields. */
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static int proto_mac_lte_framed = -1;
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extern int proto_mac_lte;
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/* Main dissection function. */
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static void dissect_mac_lte_framed(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree)
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{
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gint offset = 0;
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struct mac_lte_info *p_mac_lte_info;
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tvbuff_t *mac_tvb;
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gboolean infoAlreadySet = FALSE;
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2012-01-25 03:40:07 +00:00
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/* Need to find enabled mac-lte dissector */
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2012-01-19 02:58:53 +00:00
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dissector_handle_t mac_lte_handle = find_dissector("mac-lte");
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if (!mac_lte_handle) {
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return;
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}
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/* Do this again on re-dissection to re-discover offset of actual PDU */
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/* Needs to be at least as long as:
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- fixed header bytes
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- tag for data
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- at least one byte of MAC PDU payload */
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if ((size_t)tvb_length_remaining(tvb, offset) < (3+2)) {
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return;
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}
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/* If redissecting, use previous info struct (if available) */
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2012-01-19 03:27:41 +00:00
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p_mac_lte_info = (struct mac_lte_info*)p_get_proto_data(pinfo->fd, proto_mac_lte);
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2012-01-19 02:58:53 +00:00
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if (p_mac_lte_info == NULL) {
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/* Allocate new info struct for this frame */
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2012-01-19 03:27:41 +00:00
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p_mac_lte_info = (struct mac_lte_info*)se_alloc0(sizeof(struct mac_lte_info));
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2012-01-19 02:58:53 +00:00
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infoAlreadySet = FALSE;
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}
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else {
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infoAlreadySet = TRUE;
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}
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/* Dissect the fields to populate p_mac_lte */
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if (!dissect_mac_lte_context_fields(p_mac_lte_info, tvb, &offset)) {
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return;
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}
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2012-01-25 03:40:07 +00:00
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/* Store info in packet (first time) */
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2012-01-19 02:58:53 +00:00
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if (!infoAlreadySet) {
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p_add_proto_data(pinfo->fd, proto_mac_lte, p_mac_lte_info);
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}
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/**************************************/
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/* OK, now dissect as MAC LTE */
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/* Create tvb that starts at actual MAC PDU */
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mac_tvb = tvb_new_subset(tvb, offset, -1, tvb_reported_length(tvb)-offset);
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call_dissector_only(mac_lte_handle, mac_tvb, pinfo, tree);
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}
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void proto_register_mac_lte_framed(void)
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{
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/* Register protocol. */
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proto_mac_lte_framed = proto_register_protocol("mac-lte-framed", "MAC-LTE-FRAMED", "mac-lte-framed");
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/* Allow other dissectors to find this one by name. */
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register_dissector("mac-lte-framed", dissect_mac_lte_framed, proto_mac_lte_framed);
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}
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