forked from osmocom/wireshark
![Bill Meier](/assets/img/avatar_default.png)
(for some dissectors which fetch all other integral fields using ENC_BIG_ENDIAN). Change-Id: Ic18e3172aad76af12b12d6732c88497be22aed56 Reviewed-on: https://code.wireshark.org/review/5748 Reviewed-by: Bill Meier <wmeier@newsguy.com>
218 lines
6.6 KiB
C
218 lines
6.6 KiB
C
/* packet-marker.c
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* Routines for Link Aggregation Marker protocol dissection.
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* IEEE Std 802.1AX
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*
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* Copyright 2002 Steve Housley <steve_housley@3com.com>
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* Copyright 2005 Dominique Bastien <dbastien@accedian.com>
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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/slow_protocol_subtypes.h>
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/* General declarations */
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void proto_register_marker(void);
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void proto_reg_handoff_marker(void);
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/* MARKER TLVs subtype */
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#define MARKERPDU_END_MARKER 0x0
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#define MARKERPDU_MARKER_INFO 0x1
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#define MARKERPDU_MARKER_RESPONSE 0x2
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static const value_string marker_vals[] = {
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{ MARKERPDU_MARKER_INFO, "Marker Information" },
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{ MARKERPDU_MARKER_RESPONSE, "Marker Response Information" },
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{ 0, NULL }
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};
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/* Initialise the protocol and registered fields */
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static int proto_marker = -1;
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static int hf_marker_version_number = -1;
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static int hf_marker_tlv_type = -1;
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static int hf_marker_tlv_length = -1;
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static int hf_marker_req_port = -1;
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static int hf_marker_req_system = -1;
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static int hf_marker_req_trans_id = -1;
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/* Initialise the subtree pointers */
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static gint ett_marker = -1;
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/*
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* Name: dissect_marker
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*
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* Description:
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* This function is used to dissect the Link Aggregation Marker Protocol
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* slow protocols defined in IEEE802.3 clause 43.5 (The PDUs are defined
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* in section 43.5.3.2). The TLV types are 0x01 for a marker TLV and 0x02
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* for a marker response. A value of 0x00 indicates an end of message.
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*
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* Input Arguments:
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* tvb: buffer associated with the rcv packet (see tvbuff.h).
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* pinfo: structure associated with the rcv packet (see packet_info.h).
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* tree: the protocol tree associated with the rcv packet (see proto.h).
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*
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* Return Values: None
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*
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* Notes:
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* Dominique Bastien (dbastien@accedian.com)
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* + add support for MARKER and MARKER Response PDUs.
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*/
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static void
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dissect_marker(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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guint8 raw_octet;
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proto_tree *marker_tree;
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proto_item *marker_item;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Marker");
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col_set_str(pinfo->cinfo, COL_INFO, "Marker Protocol");
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if (tree)
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{
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marker_item = proto_tree_add_protocol_format(tree, proto_marker, tvb,
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0, -1, "Marker Protocol");
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marker_tree = proto_item_add_subtree(marker_item, ett_marker);
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/* Version Number */
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proto_tree_add_item(marker_tree, hf_marker_version_number, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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while (1)
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{
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/* TLV Type */
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raw_octet = tvb_get_guint8(tvb, offset);
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if (raw_octet == MARKERPDU_END_MARKER)
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break;
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proto_tree_add_uint(marker_tree, hf_marker_tlv_type, tvb,
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offset, 1, raw_octet);
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offset += 1;
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/* TLV Length */
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proto_tree_add_item(marker_tree, hf_marker_tlv_length, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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/* Requester Port */
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proto_tree_add_item(marker_tree, hf_marker_req_port, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* Requester System */
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proto_tree_add_item(marker_tree, hf_marker_req_system, tvb,
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offset, 6, ENC_NA);
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offset += 6;
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/* Requester Transaction ID */
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proto_tree_add_item(marker_tree, hf_marker_req_trans_id, tvb,
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offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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/* Pad to align */
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offset += 2;
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}
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}
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_marker(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_marker_version_number,
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{ "Version Number", "marker.version",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Marker protocol version", HFILL }},
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{ &hf_marker_tlv_type,
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{ "TLV Type", "marker.tlvType",
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FT_UINT8, BASE_HEX, VALS(marker_vals), 0x0,
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NULL, HFILL }},
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{ &hf_marker_tlv_length,
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{ "TLV Length", "marker.tlvLen",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"Length of the Actor TLV", HFILL }},
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{ &hf_marker_req_port,
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{ "Requester Port", "marker.requesterPort",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_marker_req_system,
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{ "Requester System", "marker.requesterSystem",
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FT_ETHER, BASE_NONE, NULL, 0x0,
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"Requester System ID encoded as a MAC address", HFILL }},
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{ &hf_marker_req_trans_id,
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{ "Requester Transaction ID", "marker.requesterTransId",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_marker,
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};
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/* Register the protocol name and description */
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proto_marker = proto_register_protocol("Marker", "Link Aggregation Marker Protocol", "marker");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_marker, 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_marker(void)
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{
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dissector_handle_t marker_handle;
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marker_handle = create_dissector_handle(dissect_marker, proto_marker);
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dissector_add_uint("slow.subtype", MARKER_SUBTYPE, marker_handle);
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}
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/*
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* Editor modelines - http://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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