5ed4f53e2b
Change-Id: I008a9136890354aae583aaaf9ccf9213d5efe539 Reviewed-on: https://code.wireshark.org/review/37189 Petri-Dish: Martin Mathieson <martin.r.mathieson@googlemail.com> Tested-by: Petri Dish Buildbot Reviewed-by: Martin Mathieson <martin.r.mathieson@googlemail.com>
201 lines
5.7 KiB
C
201 lines
5.7 KiB
C
/* packet-tte.c
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* Routines for Time Triggered Ethernet dissection
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*
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* Author: Valentin Ecker, valentin.ecker (AT) tttech.com
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* Author: Benjamin Roch, benjamin.roch (AT) tttech.com
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*
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* TTTech Computertechnik AG, Austria.
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* https://www.tttech.com/technologies/time-triggered-ethernet/
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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/prefs.h>
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#include <epan/etypes.h>
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#include "packet-tte.h"
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void proto_register_tte(void);
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void proto_reg_handoff_tte(void);
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static dissector_handle_t ethertype_handle;
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/* Initialize the protocol and registered fields */
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static int proto_tte = -1;
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static int hf_eth_dst = -1;
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static int hf_tte_dst_cf = -1;
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static int hf_tte_ctid = -1;
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static int hf_eth_src = -1;
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static int hf_eth_type = -1;
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/* preference value pointers */
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static guint32 tte_pref_ct_marker = 0xFFFFFFFF;
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static guint32 tte_pref_ct_mask = 0x0;
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/* Initialize the subtree pointers */
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static gint ett_tte = -1;
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static gint ett_tte_macdest = -1;
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/* Code to actually dissect the packets */
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static int
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dissect_tte(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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int is_frame_pcf;
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ethertype_data_t ethertype_data;
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *tte_root_item, *tte_macdest_item;
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proto_tree *tte_tree, *tte_macdest_tree;
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/* Check that there's enough data */
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if (tvb_reported_length(tvb) < TTE_HEADER_LENGTH)
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return 0;
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/* check if data of pcf frame */
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is_frame_pcf =
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(tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) == ETHERTYPE_TTE_PCF);
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/* return if no valid constant field is found */
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if (!is_frame_pcf)
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{
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if ( (tvb_get_ntohl(tvb, 0) & tte_pref_ct_mask) != tte_pref_ct_marker)
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return 0;
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}
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TTE/");
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if (tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2) <= IEEE_802_3_MAX_LEN)
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{
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col_set_str(pinfo->cinfo, COL_INFO, "TTEthernet Frame");
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}
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else
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{
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col_set_str(pinfo->cinfo, COL_INFO, "Bogus TTEthernet Frame");
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}
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if (tree) {
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/* create display subtree for the protocol */
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tte_root_item = proto_tree_add_item(tree, proto_tte, tvb, 0,
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TTE_HEADER_LENGTH, ENC_NA);
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tte_tree = proto_item_add_subtree(tte_root_item, ett_tte);
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tte_macdest_item = proto_tree_add_item(tte_tree,
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hf_eth_dst, tvb, 0, TTE_MAC_LENGTH, ENC_NA);
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proto_tree_add_item(tte_tree,
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hf_eth_src, tvb, TTE_MAC_LENGTH, TTE_MAC_LENGTH, ENC_NA);
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proto_tree_add_item(tte_tree,
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hf_eth_type, tvb, TTE_MAC_LENGTH*2, TTE_ETHERTYPE_LENGTH,
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ENC_BIG_ENDIAN);
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tte_macdest_tree = proto_item_add_subtree(tte_macdest_item,
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ett_tte_macdest);
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proto_tree_add_item(tte_macdest_tree,
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hf_tte_dst_cf, tvb, 0, TTE_MACDEST_CF_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(tte_macdest_tree,
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hf_tte_ctid, tvb, TTE_MACDEST_CF_LENGTH,
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TTE_MACDEST_CTID_LENGTH, ENC_BIG_ENDIAN);
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}
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/* prevent clearing the Columns...appending cannot be prevented */
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col_set_fence(pinfo->cinfo, COL_PROTOCOL);
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/* call std Ethernet dissector */
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ethertype_data.etype = tvb_get_ntohs(tvb, TTE_MAC_LENGTH * 2);
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ethertype_data.payload_offset = TTE_HEADER_LENGTH;
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ethertype_data.fh_tree = NULL;
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ethertype_data.trailer_id = 0;
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ethertype_data.fcs_len = 0;
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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return tvb_reported_length(tvb);
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}
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void
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proto_register_tte(void)
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{
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module_t *tte_module;
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static hf_register_info hf[] = {
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{ &hf_tte_dst_cf,
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{ "Constant Field", "tte.cf",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_tte_ctid,
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{ "Critical Traffic Identifier", "tte.ctid",
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FT_UINT16, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_tte,
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&ett_tte_macdest
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};
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/* Register the protocol name and description */
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proto_tte = proto_register_protocol("TTEthernet", "TTE", "tte");
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/* Required function calls to register header fields and subtrees used */
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proto_register_field_array(proto_tte, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register preferences module */
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tte_module = prefs_register_protocol(proto_tte, NULL);
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/* Register preferences */
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prefs_register_uint_preference(tte_module, "ct_mask_value",
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"CT Mask (in hex)",
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"Critical Traffic Mask (base hex)",
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16, &tte_pref_ct_mask);
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prefs_register_uint_preference(tte_module, "ct_marker_value",
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"CT Marker (in hex)",
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"Critical Traffic Marker (base hex)",
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16, &tte_pref_ct_marker);
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}
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void
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proto_reg_handoff_tte(void)
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{
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heur_dissector_add("eth", dissect_tte, "TTEthernet", "tte_eth", proto_tte, HEURISTIC_ENABLE);
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hf_eth_dst = proto_registrar_get_id_byname ("eth.dst");
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hf_eth_src = proto_registrar_get_id_byname ("eth.src");
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hf_eth_type = proto_registrar_get_id_byname ("eth.type");
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_tte);
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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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