forked from osmocom/wireshark
151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
/* packet-slowprotocols.c
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* Routines for EtherType (0x8809) Slow Protocols disassembly.
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* IEEE Std 802.3, Annex 57A
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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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* Copyright 2009 Artem Tamazov <artem.tamazov@telllabs.com>
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* Copyright 2010 Roberto Morro <roberto.morro[AT]tilab.com>
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* Copyright 2014 Philip Rosenberg-Watt <p.rosenberg-watt[at]cablelabs.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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* 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/slow_protocol_subtypes.h>
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/* General declarations */
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void proto_register_slow_protocols(void);
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void proto_reg_handoff_slow_protocols(void);
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static dissector_table_t slow_protocols_dissector_table;
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static const value_string subtype_vals[] = {
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{ LACP_SUBTYPE , "LACP" },
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{ MARKER_SUBTYPE , "Marker Protocol" },
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{ OAM_SUBTYPE , "OAM" },
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{ OSSP_SUBTYPE , "Organization Specific Slow Protocol" },
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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_slow = -1;
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static int hf_slow_subtype = -1;
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/* Initialise the subtree pointers */
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static gint ett_slow = -1;
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/*
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* Name: dissect_slow_protocols
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*
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* Description:
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* This function is used to dissect the slow protocols defined in IEEE802.3
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* CSMA/CD. The current slow protocols subtypes are define in Annex 57A of
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* the 802.3 document. In case of an unsupported slow protocol, we only
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* fill the protocol and info columns.
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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:
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* None
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*/
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static int
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dissect_slow_protocols(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint8 subtype;
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proto_tree *pdu_tree;
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proto_item *pdu_item;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Slow Protocols");
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subtype = tvb_get_guint8(tvb, 0);
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col_add_fstr(pinfo->cinfo, COL_INFO, "Subtype = %u", subtype);
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if (tree)
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{
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pdu_item = proto_tree_add_item(tree, proto_slow, tvb, 0, 1, ENC_NA);
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pdu_tree = proto_item_add_subtree(pdu_item, ett_slow);
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/* Subtype */
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proto_tree_add_item(pdu_tree, hf_slow_subtype, tvb, 0, 1, ENC_BIG_ENDIAN);
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}
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next_tvb = tvb_new_subset_remaining(tvb, 1);
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if (!dissector_try_uint_new(slow_protocols_dissector_table, subtype,
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next_tvb, pinfo, tree, TRUE, NULL))
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call_data_dissector(next_tvb, pinfo, tree);
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set_actual_length(tvb, tvb_captured_length(next_tvb) + 1);
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return tvb_captured_length(tvb);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_slow_protocols(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_slow_subtype,
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{ "Slow Protocols subtype", "slow.subtype",
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FT_UINT8, BASE_HEX, VALS(subtype_vals), 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_slow,
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};
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/* Register the protocol name and description */
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proto_slow = proto_register_protocol("Slow Protocols", "802.3 Slow protocols", "slow");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_slow, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* subdissector code */
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slow_protocols_dissector_table = register_dissector_table("slow.subtype",
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"Slow protocol subtype",
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proto_slow, FT_UINT8, BASE_DEC);
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}
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void
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proto_reg_handoff_slow_protocols(void)
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{
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dissector_handle_t slow_protocols_handle;
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slow_protocols_handle = create_dissector_handle(dissect_slow_protocols, proto_slow);
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dissector_add_uint("ethertype", ETHERTYPE_SLOW_PROTOCOLS, slow_protocols_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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