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/* packet-netlink-netfilter.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define NEW_PROTO_TREE_API
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include "packet-netlink.h"
void proto_register_netlink_netfilter(void);
void proto_reg_handoff_netlink_netfilter(void);
typedef struct {
packet_info *pinfo;
struct packet_netlink_data *data;
int encoding; /* copy of data->encoding */
} netlink_netfilter_info_t;
static dissector_handle_t netlink_netfilter;
static dissector_handle_t nflog_handle;
static header_field_info *hfi_netlink_netfilter = NULL;
#define NETLINK_NETFILTER_HFI_INIT HFI_INIT(proto_netlink_netfilter)
/* nfnetlink subsystems from <linux/netfilter/nfnetlink.h> */
enum {
WS_NFNL_SUBSYS_NONE = 0,
WS_NFNL_SUBSYS_CTNETLINK = 1,
WS_NFNL_SUBSYS_CTNETLINK_EXP = 2,
WS_NFNL_SUBSYS_QUEUE = 3,
WS_NFNL_SUBSYS_ULOG = 4,
WS_NFNL_SUBSYS_OSF = 5,
WS_NFNL_SUBSYS_IPSET = 6,
WS_NFNL_SUBSYS_ACCT = 7,
WS_NFNL_SUBSYS_CTNETLINK_TIMEOUT = 8,
WS_NFNL_SUBSYS_CTHELPER = 9
};
/* nfnetlink ULOG subsystem types from <linux/netfilter/nfnetlink_log.h> */
enum ws_nfulnl_msg_types {
WS_NFULNL_MSG_PACKET = 0,
WS_NFULNL_MSG_CONFIG = 1
};
/* nfnetlink QUEUE subsystem types from <linux/netfilter/nfnetlink_queue.h> */
enum ws_nfqnl_msg_types {
WS_NFQNL_MSG_PACKET = 0,
WS_NFQNL_MSG_VERDICT = 1,
WS_NFQNL_MSG_CONFIG = 2,
WS_NFQNL_MSG_VERDICT_BATCH = 3
};
static int ett_netlink_netfilter = -1;
/* QUEUE */
static const value_string netlink_netfilter_queue_type_vals[] = {
{ WS_NFQNL_MSG_PACKET, "Packet" },
{ WS_NFQNL_MSG_VERDICT, "Verdict" },
{ WS_NFQNL_MSG_CONFIG, "Config" },
{ WS_NFQNL_MSG_VERDICT_BATCH, "Verdict (batch)" },
{ 0, NULL }
};
static header_field_info hfi_netlink_netfilter_queue_type NETLINK_NETFILTER_HFI_INIT =
{ "Type", "netlink-netfilter.queue_type", FT_UINT16, BASE_DEC,
VALS(netlink_netfilter_queue_type_vals), 0x00FF, NULL, HFILL };
static int
dissect_netfilter_queue(tvbuff_t *tvb _U_, netlink_netfilter_info_t *info, proto_tree *tree, int offset)
{
enum ws_nfqnl_msg_types type = (enum ws_nfqnl_msg_types) (info->data->type & 0xff);
proto_tree_add_uint(tree, &hfi_netlink_netfilter_queue_type, NULL, 0, 0, info->data->type);
switch (type) {
default:
break;
}
return offset;
}
/* ULOG */
static const value_string netlink_netfilter_ulog_type_vals[] = {
{ WS_NFULNL_MSG_PACKET, "Packet" },
{ WS_NFULNL_MSG_CONFIG, "Config" },
{ 0, NULL }
};
static header_field_info hfi_netlink_netfilter_ulog_type NETLINK_NETFILTER_HFI_INIT =
{ "Type", "netlink-netfilter.ulog_type", FT_UINT16, BASE_DEC,
VALS(netlink_netfilter_ulog_type_vals), 0x00FF, NULL, HFILL };
static int
dissect_netfilter_ulog(tvbuff_t *tvb, netlink_netfilter_info_t *info, proto_tree *tree, int offset)
{
enum ws_nfulnl_msg_types type = (enum ws_nfulnl_msg_types) (info->data->type & 0xff);
proto_tree_add_uint(tree, &hfi_netlink_netfilter_ulog_type, NULL, 0, 0, info->data->type);
switch (type) {
case WS_NFULNL_MSG_PACKET:
call_dissector(nflog_handle, tvb, info->pinfo, tree);
break;
default:
break;
}
return offset;
}
static const value_string netlink_netfilter_subsystem_vals[] = {
{ WS_NFNL_SUBSYS_NONE, "None" },
{ WS_NFNL_SUBSYS_CTNETLINK, "Conntrack" },
{ WS_NFNL_SUBSYS_CTNETLINK_EXP, "Conntrack expect" },
{ WS_NFNL_SUBSYS_QUEUE, "Netfilter packet queue" },
{ WS_NFNL_SUBSYS_ULOG, "Netfilter userspace logging" },
{ WS_NFNL_SUBSYS_OSF, "OS fingerprint" },
{ WS_NFNL_SUBSYS_IPSET, "IP set" },
{ WS_NFNL_SUBSYS_ACCT, "Extended Netfilter accounting infrastructure" },
{ WS_NFNL_SUBSYS_CTNETLINK_TIMEOUT, "Extended Netfilter Connection Tracking timeout tuning" },
{ WS_NFNL_SUBSYS_CTHELPER, "Connection Tracking Helpers" },
{ 0, NULL }
};
static header_field_info hfi_netlink_netfilter_subsys NETLINK_NETFILTER_HFI_INIT =
{ "Subsystem", "netlink-netfilter.subsys", FT_UINT16, BASE_DEC,
VALS(netlink_netfilter_subsystem_vals), 0xFF00, NULL, HFILL };
static int
dissect_netlink_netfilter(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *_data)
{
struct packet_netlink_data *data = NULL;
netlink_netfilter_info_t info;
int offset;
if (_data) {
if (((struct packet_netlink_data *) _data)->magic == PACKET_NETLINK_MAGIC)
data = (struct packet_netlink_data *) _data;
}
DISSECTOR_ASSERT(data);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Netlink netfilter");
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
proto_item_set_text(tree, "Linux netlink netfilter message");
/* XXX, from header tvb */
proto_tree_add_uint(tree, &hfi_netlink_netfilter_subsys, NULL, 0, 0, data->type);
}
info.encoding = data->encoding;
info.pinfo = pinfo;
info.data = data;
offset = 0;
switch (data->type >> 8) {
case WS_NFNL_SUBSYS_QUEUE:
offset = dissect_netfilter_queue(tvb, &info, tree, offset);
break;
case WS_NFNL_SUBSYS_ULOG:
offset = dissect_netfilter_ulog(tvb, &info, tree, offset);
break;
}
return offset;
}
void
proto_register_netlink_netfilter(void)
{
#ifndef HAVE_HFI_SECTION_INIT
static header_field_info *hfi[] = {
&hfi_netlink_netfilter_subsys,
/* QUEUE */
&hfi_netlink_netfilter_queue_type,
/* ULOG */
&hfi_netlink_netfilter_ulog_type,
};
#endif
static gint *ett[] = {
&ett_netlink_netfilter,
};
int proto_netlink_netfilter;
proto_netlink_netfilter = proto_register_protocol("Linux netlink netfilter protocol", "netfilter", "netlink-netfilter" );
hfi_netlink_netfilter = proto_registrar_get_nth(proto_netlink_netfilter);
proto_register_fields(proto_netlink_netfilter, hfi, array_length(hfi));
proto_register_subtree_array(ett, array_length(ett));
netlink_netfilter = new_create_dissector_handle(dissect_netlink_netfilter, proto_netlink_netfilter);
}
void
proto_reg_handoff_netlink_netfilter(void)
{
dissector_add_uint("netlink.protocol", WS_NETLINK_NETFILTER, netlink_netfilter);
nflog_handle = find_dissector("nflog");
}
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