forked from osmocom/wireshark
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* packet-cisco-ttag.c
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* Routines for dissection of Cisco's ttag protocol.
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* Based on packet-cisco-metadata.c
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*
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* Copyright 2016 by Jaap Keuter (jkeuter[AT]xs4all.nl)
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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/etypes.h>
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#include <epan/to_str.h>
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void proto_register_ttag(void);
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void proto_reg_handoff_ttag(void);
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static dissector_handle_t ethertype_handle;
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static int proto_ttag = -1;
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static int hf_ttag_time_stamp = -1;
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static int hf_ttag_eth_type = -1;
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static gint ett_ttag = -1;
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static int
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dissect_ttag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint64 timestamp_value;
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nstime_t timestamp;
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guint16 encap_proto;
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ethertype_data_t ethertype_data;
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proto_tree *ttag_tree;
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proto_item *ti;
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gint offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TTAG");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_ttag, tvb, 0, 8, ENC_NA);
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ttag_tree = proto_item_add_subtree(ti, ett_ttag);
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timestamp_value = tvb_get_guint48(tvb, offset, ENC_BIG_ENDIAN);
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timestamp.secs = (time_t) (timestamp_value / G_GUINT64_CONSTANT(1000000000));
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timestamp.nsecs = (guint32)(timestamp_value - (timestamp.secs * G_GUINT64_CONSTANT(1000000000)));
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proto_item_append_text(ti, ", Timestamp: %s", rel_time_to_secs_str(pinfo->pool, ×tamp));
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proto_tree_add_time(ttag_tree, hf_ttag_time_stamp, tvb, offset, 6, ×tamp);
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offset += 6;
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encap_proto = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(ttag_tree, hf_ttag_eth_type, tvb, offset, 2, encap_proto);
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offset += 2;
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ethertype_data.etype = encap_proto;
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ethertype_data.payload_offset = offset;
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ethertype_data.fh_tree = ttag_tree;
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/* ttag doesn't define a trailer, but there's no way to tell Ethertype dissector that.
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* At least use the correct header field to reflect that and allow proper filter expression,
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* although it will still be attached to our tree instead of Ethernet II.
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*/
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ethertype_data.trailer_id = proto_registrar_get_id_byname("eth.trailer");
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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_captured_length(tvb);
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}
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void
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proto_register_ttag(void)
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{
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static hf_register_info hf[] = {
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{ &hf_ttag_time_stamp,
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{ "Time stamp", "ttag.time_stamp", FT_RELATIVE_TIME, 0, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_ttag_eth_type,
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{ "Type", "ttag.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_ttag
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};
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proto_ttag = proto_register_protocol("Cisco ttag", "Cisco ttag", "ttag");
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proto_register_field_array(proto_ttag, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_ttag(void)
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{
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dissector_handle_t ttag_handle;
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_ttag);
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ttag_handle = create_dissector_handle(dissect_ttag, proto_ttag);
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dissector_add_for_decode_as("ethertype", ttag_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: 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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