148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/* packet-cgmp.c
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* Routines for the disassembly of the Cisco Group Management Protocol
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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/cisco_pid.h>
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/*
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* See
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*
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* http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html
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*
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* for some information on CGMP.
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*/
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void proto_register_cgmp(void);
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void proto_reg_handoff_cgmp(void);
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static int proto_cgmp = -1;
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static int hf_cgmp_version = -1;
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static int hf_cgmp_type = -1;
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static int hf_cgmp_reserved = -1;
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static int hf_cgmp_count = -1;
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static int hf_cgmp_gda = -1;
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static int hf_cgmp_usa = -1;
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static gint ett_cgmp = -1;
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static const value_string type_vals[] = {
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{ 0, "Join" },
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{ 1, "Leave" },
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{ 0, NULL },
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};
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static int
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dissect_cgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *cgmp_tree = NULL;
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int offset = 0;
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guint8 count;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CGMP");
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col_set_str(pinfo->cinfo, COL_INFO, "Cisco Group Management Protocol");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_cgmp, tvb, offset, -1,
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ENC_NA);
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cgmp_tree = proto_item_add_subtree(ti, ett_cgmp);
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proto_tree_add_item(cgmp_tree, hf_cgmp_version, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(cgmp_tree, hf_cgmp_type, tvb, offset, 1,
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ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cgmp_tree, hf_cgmp_reserved, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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count = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(cgmp_tree, hf_cgmp_count, tvb, offset, 1,
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count);
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offset += 1;
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while (count != 0) {
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proto_tree_add_item(cgmp_tree, hf_cgmp_gda, tvb, offset, 6,
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ENC_NA);
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offset += 6;
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proto_tree_add_item(cgmp_tree, hf_cgmp_usa, tvb, offset, 6,
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ENC_NA);
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offset += 6;
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count--;
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}
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_cgmp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_cgmp_version,
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{ "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0,
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NULL, HFILL }},
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{ &hf_cgmp_type,
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{ "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F,
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NULL, HFILL }},
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{ &hf_cgmp_reserved,
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{ "Reserved", "cgmp.reserved", FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_cgmp_count,
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{ "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_cgmp_gda,
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{ "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_cgmp_usa,
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{ "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_cgmp,
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};
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proto_cgmp = proto_register_protocol("Cisco Group Management Protocol",
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"CGMP", "cgmp");
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proto_register_field_array(proto_cgmp, 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_cgmp(void)
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{
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dissector_handle_t cgmp_handle;
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cgmp_handle = create_dissector_handle(dissect_cgmp, proto_cgmp);
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dissector_add_uint("llc.cisco_pid", CISCO_PID_CGMP, cgmp_handle);
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dissector_add_uint("ethertype", 0x2001, cgmp_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: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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