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wireshark/epan/dissectors/packet-marker.c

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/* packet-marker.c
* Routines for Link Aggregation Marker protocol dissection.
* IEEE Std 802.1AX
*
* Copyright 2002 Steve Housley <steve_housley@3com.com>
* Copyright 2005 Dominique Bastien <dbastien@accedian.com>
*
* 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 "config.h"
#include <epan/packet.h>
#include <epan/slow_protocol_subtypes.h>
/* General declarations */
void proto_register_marker(void);
void proto_reg_handoff_marker(void);
/* MARKER TLVs subtype */
#define MARKERPDU_END_MARKER 0x0
#define MARKERPDU_MARKER_INFO 0x1
#define MARKERPDU_MARKER_RESPONSE 0x2
static const value_string marker_vals[] = {
{ MARKERPDU_MARKER_INFO, "Marker Information" },
{ MARKERPDU_MARKER_RESPONSE, "Marker Response Information" },
{ 0, NULL }
};
/* Initialise the protocol and registered fields */
static int proto_marker = -1;
static int hf_marker_version_number = -1;
static int hf_marker_tlv_type = -1;
static int hf_marker_tlv_length = -1;
static int hf_marker_req_port = -1;
static int hf_marker_req_system = -1;
static int hf_marker_req_trans_id = -1;
/* Initialise the subtree pointers */
static gint ett_marker = -1;
/*
* Name: dissect_marker
*
* Description:
* This function is used to dissect the Link Aggregation Marker Protocol
* slow protocols defined in IEEE802.3 clause 43.5 (The PDUs are defined
* in section 43.5.3.2). The TLV types are 0x01 for a marker TLV and 0x02
* for a marker response. A value of 0x00 indicates an end of message.
*
* Input Arguments:
* tvb: buffer associated with the rcv packet (see tvbuff.h).
* pinfo: structure associated with the rcv packet (see packet_info.h).
* tree: the protocol tree associated with the rcv packet (see proto.h).
*
* Return Values: None
*
* Notes:
* Dominique Bastien (dbastien@accedian.com)
* + add support for MARKER and MARKER Response PDUs.
*/
static int
dissect_marker(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
guint8 raw_octet;
proto_tree *marker_tree;
proto_item *marker_item;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Marker");
col_set_str(pinfo->cinfo, COL_INFO, "Marker Protocol");
if (tree)
{
marker_item = proto_tree_add_protocol_format(tree, proto_marker, tvb,
0, -1, "Marker Protocol");
marker_tree = proto_item_add_subtree(marker_item, ett_marker);
/* Version Number */
proto_tree_add_item(marker_tree, hf_marker_version_number, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset += 1;
while (1)
{
/* TLV Type */
raw_octet = tvb_get_guint8(tvb, offset);
if (raw_octet == MARKERPDU_END_MARKER)
break;
proto_tree_add_uint(marker_tree, hf_marker_tlv_type, tvb,
offset, 1, raw_octet);
offset += 1;
/* TLV Length */
proto_tree_add_item(marker_tree, hf_marker_tlv_length, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Requester Port */
proto_tree_add_item(marker_tree, hf_marker_req_port, tvb,
offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* Requester System */
proto_tree_add_item(marker_tree, hf_marker_req_system, tvb,
offset, 6, ENC_NA);
offset += 6;
/* Requester Transaction ID */
proto_tree_add_item(marker_tree, hf_marker_req_trans_id, tvb,
offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* Pad to align */
offset += 2;
}
}
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_marker(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_marker_version_number,
{ "Version Number", "marker.version",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Marker protocol version", HFILL }},
{ &hf_marker_tlv_type,
{ "TLV Type", "marker.tlvType",
FT_UINT8, BASE_HEX, VALS(marker_vals), 0x0,
NULL, HFILL }},
{ &hf_marker_tlv_length,
{ "TLV Length", "marker.tlvLen",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Length of the Actor TLV", HFILL }},
{ &hf_marker_req_port,
{ "Requester Port", "marker.requesterPort",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_marker_req_system,
{ "Requester System", "marker.requesterSystem",
FT_ETHER, BASE_NONE, NULL, 0x0,
"Requester System ID encoded as a MAC address", HFILL }},
{ &hf_marker_req_trans_id,
{ "Requester Transaction ID", "marker.requesterTransId",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_marker,
};
/* Register the protocol name and description */
proto_marker = proto_register_protocol("Marker", "Link Aggregation Marker Protocol", "marker");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_marker, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_marker(void)
{
dissector_handle_t marker_handle;
marker_handle = create_dissector_handle(dissect_marker, proto_marker);
dissector_add_uint("slow.subtype", MARKER_SUBTYPE, marker_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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