9b7fb8a811
I'm not sold on the name or module the proto_data functions live in, but I believe the function arguments are solid and gives us the most flexibility for the future. And search/replace of a function name is easy enough to do. The big driving force for getting this in sooner rather than later is the saved memory on ethernet packets (and IP packets soon), that used to have file_scope() proto data when all it needed was packet_scope() data (technically packet_info->pool scoped), strictly for Decode As. All dissectors that use p_add_proto_data() only for Decode As functionality have been converted to using packet_scope(). All other dissectors were converted to using file_scope() which was the original scope for "proto" data. svn path=/trunk/; revision=53520
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/* Routines for MAC LTE format files with context info as header.
|
|
*
|
|
* Martin Mathieson
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/wmem/wmem.h>
|
|
|
|
#include "packet-mac-lte.h"
|
|
|
|
|
|
/* Initialize the protocol and registered fields. */
|
|
static int proto_mac_lte_framed = -1;
|
|
|
|
extern int proto_mac_lte;
|
|
|
|
/* Main dissection function. */
|
|
static void dissect_mac_lte_framed(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
gint offset = 0;
|
|
struct mac_lte_info *p_mac_lte_info;
|
|
tvbuff_t *mac_tvb;
|
|
gboolean infoAlreadySet = FALSE;
|
|
|
|
/* Need to find enabled mac-lte dissector */
|
|
dissector_handle_t mac_lte_handle = find_dissector("mac-lte");
|
|
if (!mac_lte_handle) {
|
|
return;
|
|
}
|
|
|
|
/* Do this again on re-dissection to re-discover offset of actual PDU */
|
|
|
|
/* Needs to be at least as long as:
|
|
- fixed header bytes
|
|
- tag for data
|
|
- at least one byte of MAC PDU payload */
|
|
if ((size_t)tvb_length_remaining(tvb, offset) < (3+2)) {
|
|
return;
|
|
}
|
|
|
|
/* If redissecting, use previous info struct (if available) */
|
|
p_mac_lte_info = (struct mac_lte_info*)p_get_proto_data(wmem_file_scope(), pinfo, proto_mac_lte, 0);
|
|
if (p_mac_lte_info == NULL) {
|
|
/* Allocate new info struct for this frame */
|
|
p_mac_lte_info = (struct mac_lte_info*)wmem_alloc0(wmem_file_scope(), sizeof(struct mac_lte_info));
|
|
infoAlreadySet = FALSE;
|
|
}
|
|
else {
|
|
infoAlreadySet = TRUE;
|
|
}
|
|
|
|
/* Dissect the fields to populate p_mac_lte */
|
|
if (!dissect_mac_lte_context_fields(p_mac_lte_info, tvb, &offset)) {
|
|
return;
|
|
}
|
|
|
|
/* Store info in packet (first time) */
|
|
if (!infoAlreadySet) {
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_mac_lte, 0, p_mac_lte_info);
|
|
}
|
|
|
|
/**************************************/
|
|
/* OK, now dissect as MAC LTE */
|
|
|
|
/* Create tvb that starts at actual MAC PDU */
|
|
mac_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector_only(mac_lte_handle, mac_tvb, pinfo, tree, NULL);
|
|
}
|
|
|
|
void proto_register_mac_lte_framed(void)
|
|
{
|
|
/* Register protocol. */
|
|
proto_mac_lte_framed = proto_register_protocol("mac-lte-framed", "MAC-LTE-FRAMED", "mac-lte-framed");
|
|
|
|
/* Allow other dissectors to find this one by name. */
|
|
register_dissector("mac-lte-framed", dissect_mac_lte_framed, proto_mac_lte_framed);
|
|
}
|
|
|