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/* packet-rgmp.c
* Routines for IGMP/RGMP packet disassembly
* Copyright 2006 Jaap Keuter
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
Based on RFC3488
This is a setup for RGMP dissection, a simple protocol bolted on IGMP.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include "packet-igmp.h"
void proto_register_rgmp(void);
void proto_reg_handoff_rgmp(void);
static int proto_rgmp = -1;
static int hf_type = -1;
static int hf_reserved = -1;
static int hf_checksum = -1;
static int hf_checksum_status = -1;
static int hf_maddr = -1;
static int ett_rgmp = -1;
static expert_field ei_checksum = EI_INIT;
static dissector_handle_t rgmp_handle;
#define MC_RGMP 0xe0000019
static const value_string rgmp_types[] = {
{IGMP_RGMP_LEAVE, "Leave"},
{IGMP_RGMP_JOIN, "Join"},
{IGMP_RGMP_BYE, "Bye"},
{IGMP_RGMP_HELLO, "Hello"},
{0, NULL}
};
/* This function is only called from the IGMP dissector */
static int
dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
{
proto_tree *tree;
proto_item *item;
guint8 type;
int offset = 0;
guint32 dst = g_htonl(MC_RGMP);
/* Shouldn't be destined for us */
if ((pinfo->dst.type != AT_IPv4) || memcmp(pinfo->dst.data, &dst, 4))
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
col_clear(pinfo->cinfo, COL_INFO);
item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_rgmp);
type = tvb_get_guint8(tvb, offset);
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
offset += 1;
/* reserved */
proto_tree_add_item(tree, hf_reserved, tvb, offset, 1, ENC_NA);
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
return offset;
}
void
proto_register_rgmp(void)
{
static hf_register_info hf[] = {
{ &hf_type,
{ "Type", "rgmp.type", FT_UINT8, BASE_HEX,
VALS(rgmp_types), 0, "RGMP Packet Type", HFILL }
},
{ &hf_reserved,
{ "Reserved", "rgmp.reserved", FT_UINT8, BASE_HEX,
NULL, 0, "RGMP Reserved", HFILL }
},
{ &hf_checksum,
{ "Checksum", "rgmp.checksum", FT_UINT16, BASE_HEX,
NULL, 0, NULL, HFILL }
},
{ &hf_checksum_status,
{ "Checksum Status", "rgmp.checksum.status", FT_UINT8, BASE_NONE,
VALS(proto_checksum_vals), 0x0, NULL, HFILL }
},
{ &hf_maddr,
{ "Multicast group address", "rgmp.maddr", FT_IPv4, BASE_NONE,
NULL, 0, NULL, HFILL }
}
};
static gint *ett[] = {
&ett_rgmp
};
static ei_register_info ei[] = {
{ &ei_checksum, { "rgmp.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
};
expert_module_t* expert_rgmp;
proto_rgmp = proto_register_protocol("Router-port Group Management Protocol", "RGMP", "rgmp");
proto_register_field_array(proto_rgmp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_rgmp = expert_register_protocol(proto_rgmp);
expert_register_field_array(expert_rgmp, ei, array_length(ei));
rgmp_handle = register_dissector("rgmp", dissect_rgmp, proto_rgmp);
}
void
proto_reg_handoff_rgmp(void)
{
dissector_add_uint("igmp.type", IGMP_RGMP_HELLO, rgmp_handle);
dissector_add_uint("igmp.type", IGMP_RGMP_BYE, rgmp_handle);
dissector_add_uint("igmp.type", IGMP_RGMP_JOIN, rgmp_handle);
dissector_add_uint("igmp.type", IGMP_RGMP_LEAVE, rgmp_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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