2 * Routines for the disassembly of the Cisco Group Management Protocol
4 * $Id: packet-cgmp.c,v 1.17 2002/08/28 21:00:08 jmayer Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <epan/packet.h>
36 * http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html
38 * for some information on CGMP.
41 static int proto_cgmp = -1;
42 static int hf_cgmp_version = -1;
43 static int hf_cgmp_type = -1;
44 static int hf_cgmp_count = -1;
45 static int hf_cgmp_gda = -1;
46 static int hf_cgmp_usa = -1;
48 static gint ett_cgmp = -1;
50 static const value_string type_vals[] = {
57 dissect_cgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
60 proto_tree *cgmp_tree = NULL;
64 if (check_col(pinfo->cinfo, COL_PROTOCOL))
65 col_set_str(pinfo->cinfo, COL_PROTOCOL, "CGMP");
66 if (check_col(pinfo->cinfo, COL_INFO))
67 col_set_str(pinfo->cinfo, COL_INFO, "Cisco Group Management Protocol");
70 ti = proto_tree_add_item(tree, proto_cgmp, tvb, offset, -1,
72 cgmp_tree = proto_item_add_subtree(ti, ett_cgmp);
74 proto_tree_add_item(cgmp_tree, hf_cgmp_version, tvb, offset, 1,
76 proto_tree_add_item(cgmp_tree, hf_cgmp_type, tvb, offset, 1,
80 offset += 2; /* skip reserved field */
82 count = tvb_get_guint8(tvb, offset);
83 proto_tree_add_uint(cgmp_tree, hf_cgmp_count, tvb, offset, 1,
88 proto_tree_add_item(cgmp_tree, hf_cgmp_gda, tvb, offset, 6,
92 proto_tree_add_item(cgmp_tree, hf_cgmp_usa, tvb, offset, 6,
102 proto_register_cgmp(void)
104 static hf_register_info hf[] = {
106 { "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0,
110 { "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F,
114 { "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0,
118 { "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0,
119 "Group Destination Address", HFILL }},
122 { "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0,
123 "Unicast Source Address", HFILL }},
125 static gint *ett[] = {
129 proto_cgmp = proto_register_protocol("Cisco Group Management Protocol",
131 proto_register_field_array(proto_cgmp, hf, array_length(hf));
132 proto_register_subtree_array(ett, array_length(ett));
136 proto_reg_handoff_cgmp(void)
138 dissector_handle_t cgmp_handle;
140 cgmp_handle = create_dissector_handle(dissect_cgmp, proto_cgmp);
141 dissector_add("llc.cisco_pid", 0x2001, cgmp_handle);
142 dissector_add("ethertype", 0x2001, cgmp_handle);