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/* Routines for MAC LTE format files with context info as header.
*
* Martin Mathieson
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/proto_data.h>
#include "packet-mac-lte.h"
void proto_register_mac_lte_framed(void);
/* Initialize the protocol and registered fields. */
static int proto_mac_lte_framed;
extern int proto_mac_lte;
/* Main dissection function. */
static int dissect_mac_lte_framed(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, void* data _U_)
{
int offset = 0;
struct mac_lte_info *p_mac_lte_info;
tvbuff_t *mac_tvb;
bool infoAlreadySet = false;
/* Need to find enabled mac-lte dissector */
dissector_handle_t mac_lte_handle = find_dissector("mac-lte");
if (!mac_lte_handle) {
return 0;
}
/* 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_reported_length_remaining(tvb, offset) < (3+2)) {
return 5;
}
/* 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 = wmem_new0(wmem_file_scope(), 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, pinfo, tree, &offset)) {
return offset;
}
/* 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);
return tvb_captured_length(tvb);
}
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);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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