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/* packet-slowprotocols.c
* Routines for EtherType (0x8809) Slow Protocols disassembly.
* IEEE Std 802.3, Annex 57A
*
* Copyright 2002 Steve Housley <steve_housley@3com.com>
* Copyright 2005 Dominique Bastien <dbastien@accedian.com>
* Copyright 2009 Artem Tamazov <artem.tamazov@telllabs.com>
* Copyright 2010 Roberto Morro <roberto.morro[AT]tilab.com>
* Copyright 2014 Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.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/etypes.h>
#include <epan/slow_protocol_subtypes.h>
/* General declarations */
void proto_register_slow_protocols(void);
void proto_reg_handoff_slow_protocols(void);
static dissector_handle_t slow_protocols_handle;
static dissector_table_t slow_protocols_dissector_table;
static const value_string subtype_vals[] = {
{ LACP_SUBTYPE , "LACP" },
{ MARKER_SUBTYPE , "Marker Protocol" },
{ OAM_SUBTYPE , "OAM" },
{ OSSP_SUBTYPE , "Organization Specific Slow Protocol" },
{ 0, NULL }
};
/* Initialise the protocol and registered fields */
static int proto_slow;
static int hf_slow_subtype;
/* Initialise the subtree pointers */
static int ett_slow;
/*
* Name: dissect_slow_protocols
*
* Description:
* This function is used to dissect the slow protocols defined in IEEE802.3
* CSMA/CD. The current slow protocols subtypes are define in Annex 57A of
* the 802.3 document. In case of an unsupported slow protocol, we only
* fill the protocol and info columns.
*
* 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
*/
static int
dissect_slow_protocols(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
uint8_t subtype;
proto_tree *pdu_tree;
proto_item *pdu_item;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Slow Protocols");
subtype = tvb_get_uint8(tvb, 0);
col_add_fstr(pinfo->cinfo, COL_INFO, "Subtype = %u", subtype);
if (tree)
{
pdu_item = proto_tree_add_item(tree, proto_slow, tvb, 0, 1, ENC_NA);
pdu_tree = proto_item_add_subtree(pdu_item, ett_slow);
/* Subtype */
proto_tree_add_item(pdu_tree, hf_slow_subtype, tvb, 0, 1, ENC_BIG_ENDIAN);
}
next_tvb = tvb_new_subset_remaining(tvb, 1);
if (!dissector_try_uint_new(slow_protocols_dissector_table, subtype,
next_tvb, pinfo, tree, true, NULL))
call_data_dissector(next_tvb, pinfo, tree);
set_actual_length(tvb, tvb_captured_length(next_tvb) + 1);
return tvb_captured_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_slow_protocols(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_slow_subtype,
{ "Slow Protocols subtype", "slow.subtype",
FT_UINT8, BASE_HEX, VALS(subtype_vals), 0x0,
NULL, HFILL }},
};
/* Setup protocol subtree array */
static int *ett[] = {
&ett_slow,
};
/* Register the protocol name and description */
proto_slow = proto_register_protocol("Slow Protocols", "802.3 Slow protocols", "slow");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_slow, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register the dissector handle */
slow_protocols_handle = register_dissector("slow", dissect_slow_protocols, proto_slow);
/* subdissector code */
slow_protocols_dissector_table = register_dissector_table("slow.subtype",
"Slow protocol subtype",
proto_slow, FT_UINT8, BASE_DEC);
}
void
proto_reg_handoff_slow_protocols(void)
{
dissector_add_uint("ethertype", ETHERTYPE_SLOW_PROTOCOLS, slow_protocols_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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