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/* packet-tte.c
* Routines for Time Triggered Ethernet dissection
*
* Author: Valentin Ecker, valentin.ecker (AT) tttech.com
* Author: Benjamin Roch, benjamin.roch (AT) tttech.com
*
* TTTech Computertechnik AG, Austria.
* https://www.tttech.com/technologies/time-triggered-ethernet/
*
* 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/prefs.h>
#include <epan/etypes.h>
#include "packet-tte.h"
void proto_register_tte(void);
void proto_reg_handoff_tte(void);
static dissector_handle_t ethertype_handle;
/* Initialize the protocol and registered fields */
static int proto_tte = -1;
static int hf_eth_dst = -1;
static int hf_tte_dst_cf = -1;
static int hf_tte_ctid = -1;
static int hf_eth_src = -1;
static int hf_eth_type = -1;
/* preference value pointers */
static guint32 tte_pref_ct_marker = 0xFFFFFFFF;
static guint32 tte_pref_ct_mask = 0x0;
/* Initialize the subtree pointers */
static gint ett_tte = -1;
static gint ett_tte_macdest = -1;
/* Code to actually dissect the packets */
static int
dissect_tte(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
int is_frame_pcf;
ethertype_data_t ethertype_data;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *tte_root_item, *tte_macdest_item;
proto_tree *tte_tree, *tte_macdest_tree;
/* Check that there's enough data */
if (tvb_reported_length(tvb) < TTE_HEADER_LENGTH)
return 0;
/* check if data of pcf frame */
is_frame_pcf =
(tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) == ETHERTYPE_TTE_PCF);
/* return if no valid constant field is found */
if (!is_frame_pcf)
{
if ( (tvb_get_ntohl(tvb, 0) & tte_pref_ct_mask) != tte_pref_ct_marker)
return 0;
}
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TTE/");
if (tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) <= IEEE_802_3_MAX_LEN)
{
col_set_str(pinfo->cinfo, COL_INFO, "TTEthernet Frame");
}
else
{
col_set_str(pinfo->cinfo, COL_INFO, "Bogus TTEthernet Frame");
}
if (tree) {
/* create display subtree for the protocol */
tte_root_item = proto_tree_add_item(tree, proto_tte, tvb, 0,
TTE_HEADER_LENGTH, ENC_NA);
tte_tree = proto_item_add_subtree(tte_root_item, ett_tte);
tte_macdest_item = proto_tree_add_item(tte_tree,
hf_eth_dst, tvb, 0, TTE_MAC_LENGTH, ENC_NA);
proto_tree_add_item(tte_tree,
hf_eth_src, tvb, TTE_MAC_LENGTH, TTE_MAC_LENGTH, ENC_NA);
proto_tree_add_item(tte_tree,
hf_eth_type, tvb, TTE_MAC_LENGTH*2, TTE_ETHERTYPE_LENGTH,
ENC_BIG_ENDIAN);
tte_macdest_tree = proto_item_add_subtree(tte_macdest_item,
ett_tte_macdest);
proto_tree_add_item(tte_macdest_tree,
hf_tte_dst_cf, tvb, 0, TTE_MACDEST_CF_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(tte_macdest_tree,
hf_tte_ctid, tvb, TTE_MACDEST_CF_LENGTH,
TTE_MACDEST_CTID_LENGTH, ENC_BIG_ENDIAN);
}
/* prevent clearing the Columns...appending cannot be prevented */
col_set_fence(pinfo->cinfo, COL_PROTOCOL);
/* call std Ethernet dissector */
ethertype_data.etype = tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2);
ethertype_data.payload_offset = TTE_HEADER_LENGTH;
ethertype_data.fh_tree = NULL;
ethertype_data.trailer_id = 0;
ethertype_data.fcs_len = 0;
call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
return tvb_reported_length(tvb);
}
void
proto_register_tte(void)
{
module_t *tte_module;
static hf_register_info hf[] = {
{ &hf_tte_dst_cf,
{ "Constant Field", "tte.cf",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_tte_ctid,
{ "Critical Traffic Identifier", "tte.ctid",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_tte,
&ett_tte_macdest
};
/* Register the protocol name and description */
proto_tte = proto_register_protocol("TTEthernet", "TTE", "tte");
/* Required function calls to register header fields and subtrees used */
proto_register_field_array(proto_tte, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register preferences module */
tte_module = prefs_register_protocol(proto_tte, NULL);
/* Register preferences */
prefs_register_uint_preference(tte_module, "ct_mask_value",
"CT Mask (in hex)",
"Critical Traffic Mask (base hex)",
16, &tte_pref_ct_mask);
prefs_register_uint_preference(tte_module, "ct_marker_value",
"CT Marker (in hex)",
"Critical Traffic Marker (base hex)",
16, &tte_pref_ct_marker);
}
void
proto_reg_handoff_tte(void)
{
heur_dissector_add("eth", dissect_tte, "TTEthernet", "tte_eth", proto_tte, HEURISTIC_ENABLE);
hf_eth_dst = proto_registrar_get_id_byname ("eth.dst");
hf_eth_src = proto_registrar_get_id_byname ("eth.src");
hf_eth_type = proto_registrar_get_id_byname ("eth.type");
ethertype_handle = find_dissector_add_dependency("ethertype", proto_tte);
}
/*
* 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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