101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/proto_data.h>
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#include "packet-mac-lte.h"
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void proto_register_mac_lte_framed(void);
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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 int dissect_mac_lte_framed(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, void* data _U_)
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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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/* Need to find enabled mac-lte dissector */
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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 0;
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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_reported_length_remaining(tvb, offset) < (3+2)) {
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return 5;
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}
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/* If redissecting, use previous info struct (if available) */
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p_mac_lte_info = (struct mac_lte_info*)p_get_proto_data(wmem_file_scope(), pinfo, proto_mac_lte, 0);
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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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p_mac_lte_info = wmem_new0(wmem_file_scope(), struct mac_lte_info);
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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, pinfo, tree, &offset)) {
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return offset;
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}
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/* Store info in packet (first time) */
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if (!infoAlreadySet) {
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p_add_proto_data(wmem_file_scope(), pinfo, proto_mac_lte, 0, 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_remaining(tvb, offset);
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call_dissector_only(mac_lte_handle, mac_tvb, pinfo, tree, NULL);
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return tvb_captured_length(tvb);
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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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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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