154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
/* packet-ethercat-frame.c
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* Routines for ethercat packet disassembly
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*
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* Copyright (c) 2007 by Beckhoff Automation GmbH
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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 files */
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include "packet-ethercat-frame.h"
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void proto_register_ethercat_frame(void);
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void proto_reg_handoff_ethercat_frame(void);
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/* Define the Ethercat frame proto */
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static int proto_ethercat_frame = -1;
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static dissector_table_t ethercat_frame_dissector_table;
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static dissector_handle_t ethercat_frame_handle;
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/* Define the tree for the EtherCAT frame */
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static int ett_ethercat_frame = -1;
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static int hf_ethercat_frame_length = -1;
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static int hf_ethercat_frame_reserved = -1;
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static int hf_ethercat_frame_type = -1;
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static const value_string EthercatFrameTypes[] =
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{
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{ 1, "EtherCAT command", },
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{ 2, "ADS", },
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{ 3, "RAW-IO", },
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{ 4, "NV", },
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{ 5, "Mailbox"},
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{ 0, NULL }
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};
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static const value_string ethercat_frame_reserved_vals[] =
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{
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{ 0, "Valid"},
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{ 1, "Invalid (must be zero for conformance with the protocol specification)"},
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{ 0, NULL}
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};
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/* Ethercat Frame */
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static int dissect_ethercat_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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proto_item *ti;
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proto_tree *ethercat_frame_tree;
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gint offset = 0;
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EtherCATFrameParserHDR hdr;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ECATF");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree)
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{
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ti = proto_tree_add_item(tree, proto_ethercat_frame, tvb, offset, EtherCATFrameParserHDR_Len, ENC_NA);
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ethercat_frame_tree = proto_item_add_subtree(ti, ett_ethercat_frame);
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proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_length, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_reserved, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_type, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN);
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}
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hdr.hdr = tvb_get_letohs(tvb, offset);
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offset = EtherCATFrameParserHDR_Len;
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/* The EtherCAT frame header has now been processed, allow sub dissectors to
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handle the rest of the PDU. */
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next_tvb = tvb_new_subset_remaining (tvb, offset);
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if (!dissector_try_uint(ethercat_frame_dissector_table, hdr.v.protocol,
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next_tvb, pinfo, tree))
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{
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col_add_fstr (pinfo->cinfo, COL_PROTOCOL, "0x%04x", hdr.v.protocol);
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/* No sub dissector wanted to handle this payload, decode it as general
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data instead. */
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call_data_dissector(next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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void proto_register_ethercat_frame(void)
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{
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static hf_register_info hf[] =
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{
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{ &hf_ethercat_frame_length,
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{ "Length", "ecatf.length",
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FT_UINT16, BASE_HEX, NULL, 0x07FF,
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NULL, HFILL }
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},
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{ &hf_ethercat_frame_reserved,
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{ "Reserved", "ecatf.reserved",
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FT_UINT16, BASE_HEX, VALS(ethercat_frame_reserved_vals), 0x0800,
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NULL, HFILL}
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},
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{ &hf_ethercat_frame_type,
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{ "Type", "ecatf.type",
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FT_UINT16, BASE_HEX, VALS(EthercatFrameTypes), 0xF000,
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"E88A4 Types", HFILL }
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}
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};
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static gint *ett[] =
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{
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&ett_ethercat_frame
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};
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proto_ethercat_frame = proto_register_protocol("EtherCAT frame header", "ETHERCAT", "ecatf");
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proto_register_field_array(proto_ethercat_frame,hf,array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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ethercat_frame_handle = register_dissector("ecatf", dissect_ethercat_frame, proto_ethercat_frame);
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/* Define a handle (ecatf.type) for sub dissectors that want to dissect
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the Ethercat frame ether type (E88A4) payload. */
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ethercat_frame_dissector_table = register_dissector_table("ecatf.type", "EtherCAT frame type",
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proto_ethercat_frame, FT_UINT8, BASE_DEC);
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}
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void proto_reg_handoff_ethercat_frame(void)
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{
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dissector_add_uint("ethertype", ETHERTYPE_ECATF, ethercat_frame_handle);
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dissector_add_uint_with_preference("udp.port", ETHERTYPE_ECATF, ethercat_frame_handle);
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dissector_add_uint_with_preference("tcp.port", ETHERTYPE_ECATF, ethercat_frame_handle);
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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: 3
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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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* ex: set shiftwidth=3 tabstop=8 expandtab:
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* :indentSize=3:tabSize=8:noTabs=true:
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*/
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