diff options
Diffstat (limited to 'plugins/epan/ethercat/packet-ethercat-frame.c')
| -rw-r--r-- | plugins/epan/ethercat/packet-ethercat-frame.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/plugins/epan/ethercat/packet-ethercat-frame.c b/plugins/epan/ethercat/packet-ethercat-frame.c new file mode 100644 index 0000000000..bf59d6ca45 --- /dev/null +++ b/plugins/epan/ethercat/packet-ethercat-frame.c @@ -0,0 +1,164 @@ +/* packet-ethercat-frame.c + * Routines for ethercat packet disassembly + * + * Copyright (c) 2007 by Beckhoff Automation GmbH + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* Include files */ + +#include "config.h" + +#include <epan/packet.h> +#include <epan/etypes.h> + +#include "packet-ethercat-frame.h" + +void proto_register_ethercat_frame(void); +void proto_reg_handoff_ethercat_frame(void); + +/* Define the Ethercat frame proto */ +static int proto_ethercat_frame = -1; + +static dissector_table_t ethercat_frame_dissector_table; + +static dissector_handle_t ethercat_frame_handle; + +/* Define the tree for the EtherCAT frame */ +static int ett_ethercat_frame = -1; +static int hf_ethercat_frame_length = -1; +static int hf_ethercat_frame_reserved = -1; +static int hf_ethercat_frame_type = -1; + +static const value_string EthercatFrameTypes[] = +{ + { 1, "EtherCAT command", }, + { 2, "ADS", }, + { 3, "RAW-IO", }, + { 4, "NV", }, + { 0, NULL } +}; + +static const value_string ethercat_frame_reserved_vals[] = +{ + { 0, "Valid"}, + { 1, "Invalid (must be zero for conformance with the protocol specification)"}, + { 0, NULL} +}; + +/* Ethercat Frame */ +static int dissect_ethercat_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + tvbuff_t *next_tvb; + proto_item *ti; + proto_tree *ethercat_frame_tree; + gint offset = 0; + EtherCATFrameParserHDR hdr; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "ECATF"); + + col_clear(pinfo->cinfo, COL_INFO); + + if (tree) + { + ti = proto_tree_add_item(tree, proto_ethercat_frame, tvb, offset, EtherCATFrameParserHDR_Len, ENC_NA); + ethercat_frame_tree = proto_item_add_subtree(ti, ett_ethercat_frame); + + proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_length, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN); + proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_reserved, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN); + proto_tree_add_item(ethercat_frame_tree, hf_ethercat_frame_type, tvb, offset, EtherCATFrameParserHDR_Len, ENC_LITTLE_ENDIAN); + } + hdr.hdr = tvb_get_letohs(tvb, offset); + offset = EtherCATFrameParserHDR_Len; + + /* The EtherCAT frame header has now been processed, allow sub dissectors to + handle the rest of the PDU. */ + next_tvb = tvb_new_subset_remaining (tvb, offset); + + if (!dissector_try_uint(ethercat_frame_dissector_table, hdr.v.protocol, + next_tvb, pinfo, tree)) + { + col_add_fstr (pinfo->cinfo, COL_PROTOCOL, "0x%04x", hdr.v.protocol); + /* No sub dissector wanted to handle this payload, decode it as general + data instead. */ + call_data_dissector(next_tvb, pinfo, tree); + } + return tvb_captured_length(tvb); +} + +void proto_register_ethercat_frame(void) +{ + static hf_register_info hf[] = + { + { &hf_ethercat_frame_length, + { "Length", "ecatf.length", + FT_UINT16, BASE_HEX, NULL, 0x07FF, + NULL, HFILL } + }, + + { &hf_ethercat_frame_reserved, + { "Reserved", "ecatf.reserved", + FT_UINT16, BASE_HEX, VALS(ethercat_frame_reserved_vals), 0x0800, + NULL, HFILL} + }, + + { &hf_ethercat_frame_type, + { "Type", "ecatf.type", + FT_UINT16, BASE_HEX, VALS(EthercatFrameTypes), 0xF000, + "E88A4 Types", HFILL } + } + }; + + static gint *ett[] = + { + &ett_ethercat_frame + }; + + proto_ethercat_frame = proto_register_protocol("EtherCAT frame header", "ETHERCAT", "ecatf"); + proto_register_field_array(proto_ethercat_frame,hf,array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + ethercat_frame_handle = register_dissector("ecatf", dissect_ethercat_frame, proto_ethercat_frame); + + /* Define a handle (ecatf.type) for sub dissectors that want to dissect + the Ethercat frame ether type (E88A4) payload. */ + ethercat_frame_dissector_table = register_dissector_table("ecatf.type", "EtherCAT frame type", + proto_ethercat_frame, FT_UINT8, BASE_DEC); +} + +void proto_reg_handoff_ethercat_frame(void) +{ + dissector_add_uint("ethertype", ETHERTYPE_ECATF, ethercat_frame_handle); + dissector_add_uint_with_preference("udp.port", ETHERTYPE_ECATF, ethercat_frame_handle); + dissector_add_uint_with_preference("tcp.port", ETHERTYPE_ECATF, ethercat_frame_handle); +} + +/* + * Editor modelines - http://www.wireshark.org/tools/modelines.html + * + * Local Variables: + * c-basic-offset: 3 + * tab-width: 8 + * indent-tabs-mode: nil + * End: + * + * ex: set shiftwidth=3 tabstop=8 expandtab: + * :indentSize=3:tabSize=8:noTabs=true: + */ |