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/* packet-cgmp.c
* Routines for the disassembly of the Cisco Group Management Protocol
*
* 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/cisco_pid.h>
/*
* See
*
* http://www.barnett.sk/software/bbooks/cisco_multicasting_routing/chap04.html
*
* for some information on CGMP.
*/
void proto_register_cgmp(void);
void proto_reg_handoff_cgmp(void);
static dissector_handle_t cgmp_handle;
static int proto_cgmp;
static int hf_cgmp_version;
static int hf_cgmp_type;
static int hf_cgmp_reserved;
static int hf_cgmp_count;
static int hf_cgmp_gda;
static int hf_cgmp_usa;
static int ett_cgmp;
static const value_string type_vals[] = {
{ 0, "Join" },
{ 1, "Leave" },
{ 0, NULL },
};
static int
dissect_cgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *cgmp_tree = NULL;
int offset = 0;
uint8_t count;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CGMP");
col_set_str(pinfo->cinfo, COL_INFO, "Cisco Group Management Protocol");
if (tree) {
ti = proto_tree_add_item(tree, proto_cgmp, tvb, offset, -1,
ENC_NA);
cgmp_tree = proto_item_add_subtree(ti, ett_cgmp);
proto_tree_add_item(cgmp_tree, hf_cgmp_version, tvb, offset, 1,
ENC_BIG_ENDIAN);
proto_tree_add_item(cgmp_tree, hf_cgmp_type, tvb, offset, 1,
ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(cgmp_tree, hf_cgmp_reserved, tvb, offset, 2,
ENC_BIG_ENDIAN);
offset += 2;
count = tvb_get_uint8(tvb, offset);
proto_tree_add_uint(cgmp_tree, hf_cgmp_count, tvb, offset, 1,
count);
offset += 1;
while (count != 0) {
proto_tree_add_item(cgmp_tree, hf_cgmp_gda, tvb, offset, 6,
ENC_NA);
offset += 6;
proto_tree_add_item(cgmp_tree, hf_cgmp_usa, tvb, offset, 6,
ENC_NA);
offset += 6;
count--;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_cgmp(void)
{
static hf_register_info hf[] = {
{ &hf_cgmp_version,
{ "Version", "cgmp.version", FT_UINT8, BASE_DEC, NULL, 0xF0,
NULL, HFILL }},
{ &hf_cgmp_type,
{ "Type", "cgmp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0F,
NULL, HFILL }},
{ &hf_cgmp_reserved,
{ "Reserved", "cgmp.reserved", FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_cgmp_count,
{ "Count", "cgmp.count", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_cgmp_gda,
{ "Group Destination Address", "cgmp.gda", FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_cgmp_usa,
{ "Unicast Source Address", "cgmp.usa", FT_ETHER, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static int *ett[] = {
&ett_cgmp,
};
proto_cgmp = proto_register_protocol("Cisco Group Management Protocol",
"CGMP", "cgmp");
proto_register_field_array(proto_cgmp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
cgmp_handle = register_dissector("cgmp", dissect_cgmp, proto_cgmp);
}
void
proto_reg_handoff_cgmp(void)
{
dissector_add_uint("llc.cisco_pid", CISCO_PID_CGMP, cgmp_handle);
dissector_add_uint("ethertype", 0x2001, cgmp_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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