160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* 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:
|
|
*/
|