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/* packet-marker.c
* Routines for Link Aggregation Marker protocol dissection.
* IEEE Std 802.1AX-2014 Section 6.5
*
* 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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/to_str.h>
#include <epan/expert.h>
#include <epan/slow_protocol_subtypes.h>
/* General declarations */
void proto_register_marker(void);
void proto_reg_handoff_marker(void);
static dissector_handle_t marker_handle;
/* MARKER TLVs subtype */
#define MARKER_TERMINATOR 0x0
#define MARKERPDU_MARKER_INFO 0x1
#define MARKERPDU_MARKER_RESPONSE 0x2
static const value_string marker_vals[] = {
{ MARKER_TERMINATOR, "Marker Terminator" },
{ MARKERPDU_MARKER_INFO, "Marker Information" },
{ MARKERPDU_MARKER_RESPONSE, "Marker Response Information" },
{ 0, NULL }
};
/* Initialise the protocol and registered fields */
static int proto_marker;
static int hf_marker_version_number;
static int hf_marker_tlv_type;
static int hf_marker_tlv_length;
static int hf_marker_req_port;
static int hf_marker_req_system;
static int hf_marker_req_trans_id;
static int hf_marker_req_pad;
static int hf_marker_reserved;
/* Expert Items */
static expert_field ei_marker_wrong_tlv_type;
static expert_field ei_marker_wrong_tlv_length;
static expert_field ei_marker_wrong_pad_value;
/* Initialise the subtree pointers */
static int ett_marker;
static int
dissect_marker(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
unsigned tlv_type, tlv_length;
unsigned port, transactionid, pad;
const char *sysidstr;
proto_tree *marker_tree;
proto_item *marker_item, *tlv_type_item, *tlv_length_item, *pad_item;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Marker");
col_set_str(pinfo->cinfo, COL_INFO, "Marker Protocol");
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);
proto_tree_add_item(marker_tree, hf_marker_version_number, tvb,
offset, 1, ENC_BIG_ENDIAN);
offset += 1;
tlv_type_item = proto_tree_add_item_ret_uint(marker_tree, hf_marker_tlv_type, tvb,
offset, 1, ENC_BIG_ENDIAN, &tlv_type);
offset += 1;
tlv_length_item = proto_tree_add_item_ret_uint(marker_tree, hf_marker_tlv_length, tvb,
offset, 1, ENC_BIG_ENDIAN, &tlv_length);
offset += 1;
if (tlv_type == MARKERPDU_MARKER_INFO) {
col_set_str(pinfo->cinfo, COL_INFO, "Information");
} else if (tlv_type == MARKERPDU_MARKER_RESPONSE) {
col_set_str(pinfo->cinfo, COL_INFO, "Response");
} else {
expert_add_info(pinfo, tlv_type_item, &ei_marker_wrong_tlv_type);
}
if (tlv_length != 16) {
expert_add_info(pinfo, tlv_length_item, &ei_marker_wrong_tlv_length);
}
proto_tree_add_item_ret_uint(marker_tree, hf_marker_req_port, tvb,
offset, 2, ENC_BIG_ENDIAN, &port);
offset += 2;
proto_tree_add_item(marker_tree, hf_marker_req_system, tvb,
offset, 6, ENC_NA);
sysidstr = tvb_ether_to_str(pinfo->pool, tvb, offset);
offset += 6;
proto_tree_add_item_ret_uint(marker_tree, hf_marker_req_trans_id, tvb,
offset, 4, ENC_BIG_ENDIAN, &transactionid);
offset += 4;
col_append_fstr(pinfo->cinfo, COL_INFO, " SysId=%s, P=%d, TId=%d",
sysidstr, port, transactionid);
pad_item = proto_tree_add_item_ret_uint(marker_tree, hf_marker_req_pad, tvb,
offset, 2, ENC_BIG_ENDIAN, &pad);
if (pad != 0) {
expert_add_info(pinfo, pad_item, &ei_marker_wrong_pad_value);
}
offset += 2;
proto_tree_add_item_ret_uint(marker_tree, hf_marker_tlv_type, tvb,
offset, 1, ENC_BIG_ENDIAN, &tlv_type);
offset += 1;
proto_tree_add_item_ret_uint(marker_tree, hf_marker_tlv_length, tvb,
offset, 1, ENC_BIG_ENDIAN, &tlv_length);
offset += 1;
if (tlv_type == MARKER_TERMINATOR) {
if (tlv_length != 0) {
expert_add_info(pinfo, tlv_type_item, &ei_marker_wrong_tlv_length);
}
} else {
expert_add_info(pinfo, tlv_type_item, &ei_marker_wrong_tlv_type);
}
proto_tree_add_item(marker_tree, hf_marker_reserved, tvb,
offset, 90, ENC_NA);
offset += 90;
return offset;
}
/* 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 }},
{ &hf_marker_req_pad,
{ "Requester Pad", "marker.requesterPad",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_marker_reserved,
{ "Reserved", "marker.reserved",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
/* Setup protocol subtree array */
static int *ett[] = {
&ett_marker,
};
static ei_register_info ei[] = {
{ &ei_marker_wrong_tlv_type, { "marker.wrong_tlv_type", PI_MALFORMED, PI_ERROR, "TLV is not expected type", EXPFILL }},
{ &ei_marker_wrong_tlv_length, { "marker.wrong_tlv_length", PI_MALFORMED, PI_ERROR, "TLV is not expected length", EXPFILL }},
{ &ei_marker_wrong_pad_value, { "marker.wrong_pad_value", PI_PROTOCOL, PI_WARN, "pad value is not 0", EXPFILL }},
};
expert_module_t* expert_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));
expert_marker = expert_register_protocol(proto_marker);
expert_register_field_array(expert_marker, ei, array_length(ei));
marker_handle = register_dissector("marker", dissect_marker, proto_marker);
}
void
proto_reg_handoff_marker(void)
{
dissector_add_uint("slow.subtype", MARKER_SUBTYPE, marker_handle);
}
/*
* Editor modelines - https://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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