1/*
 2 * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/skbuff.h>
12
13#include <linux/netfilter/x_tables.h>
14#include <linux/netfilter/xt_NFLOG.h>
15#include <net/netfilter/nf_log.h>
16#include <net/netfilter/nfnetlink_log.h>
17
18MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
19MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
20MODULE_LICENSE("GPL");
21MODULE_ALIAS("ipt_NFLOG");
22MODULE_ALIAS("ip6t_NFLOG");
23
24static unsigned int
25nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
26{
27	const struct xt_nflog_info *info = par->targinfo;
28	struct net *net = xt_net(par);
29	struct nf_loginfo li;
30
31	li.type		     = NF_LOG_TYPE_ULOG;
32	li.u.ulog.copy_len   = info->len;
33	li.u.ulog.group	     = info->group;
34	li.u.ulog.qthreshold = info->threshold;
35	li.u.ulog.flags	     = 0;
36
37	if (info->flags & XT_NFLOG_F_COPY_LEN)
38		li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
39
40	nfulnl_log_packet(net, xt_family(par), xt_hooknum(par), skb,
41			  xt_in(par), xt_out(par), &li, info->prefix);
 
42	return XT_CONTINUE;
43}
44
45static int nflog_tg_check(const struct xt_tgchk_param *par)
46{
47	const struct xt_nflog_info *info = par->targinfo;
48
49	if (info->flags & ~XT_NFLOG_MASK)
50		return -EINVAL;
51	if (info->prefix[sizeof(info->prefix) - 1] != '\0')
52		return -EINVAL;
53	return 0;
 
 
 
 
 
 
54}
55
56static struct xt_target nflog_tg_reg __read_mostly = {
57	.name       = "NFLOG",
58	.revision   = 0,
59	.family     = NFPROTO_UNSPEC,
60	.checkentry = nflog_tg_check,
 
61	.target     = nflog_tg,
62	.targetsize = sizeof(struct xt_nflog_info),
63	.me         = THIS_MODULE,
64};
65
66static int __init nflog_tg_init(void)
67{
68	return xt_register_target(&nflog_tg_reg);
69}
70
71static void __exit nflog_tg_exit(void)
72{
73	xt_unregister_target(&nflog_tg_reg);
74}
75
76module_init(nflog_tg_init);
77module_exit(nflog_tg_exit);

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2006 Patrick McHardy <kaber@trash.net>
 
 
 
 
 4 */
 5
 6#include <linux/module.h>
 7#include <linux/init.h>
 8#include <linux/skbuff.h>
 9
10#include <linux/netfilter/x_tables.h>
11#include <linux/netfilter/xt_NFLOG.h>
12#include <net/netfilter/nf_log.h>
 
13
14MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
15MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
16MODULE_LICENSE("GPL");
17MODULE_ALIAS("ipt_NFLOG");
18MODULE_ALIAS("ip6t_NFLOG");
19
20static unsigned int
21nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
22{
23	const struct xt_nflog_info *info = par->targinfo;
24	struct net *net = xt_net(par);
25	struct nf_loginfo li;
26
27	li.type		     = NF_LOG_TYPE_ULOG;
28	li.u.ulog.copy_len   = info->len;
29	li.u.ulog.group	     = info->group;
30	li.u.ulog.qthreshold = info->threshold;
31	li.u.ulog.flags	     = 0;
32
33	if (info->flags & XT_NFLOG_F_COPY_LEN)
34		li.u.ulog.flags |= NF_LOG_F_COPY_LEN;
35
36	nf_log_packet(net, xt_family(par), xt_hooknum(par), skb, xt_in(par),
37		      xt_out(par), &li, "%s", info->prefix);
38
39	return XT_CONTINUE;
40}
41
42static int nflog_tg_check(const struct xt_tgchk_param *par)
43{
44	const struct xt_nflog_info *info = par->targinfo;
45
46	if (info->flags & ~XT_NFLOG_MASK)
47		return -EINVAL;
48	if (info->prefix[sizeof(info->prefix) - 1] != '\0')
49		return -EINVAL;
50
51	return nf_logger_find_get(par->family, NF_LOG_TYPE_ULOG);
52}
53
54static void nflog_tg_destroy(const struct xt_tgdtor_param *par)
55{
56	nf_logger_put(par->family, NF_LOG_TYPE_ULOG);
57}
58
59static struct xt_target nflog_tg_reg __read_mostly = {
60	.name       = "NFLOG",
61	.revision   = 0,
62	.family     = NFPROTO_UNSPEC,
63	.checkentry = nflog_tg_check,
64	.destroy    = nflog_tg_destroy,
65	.target     = nflog_tg,
66	.targetsize = sizeof(struct xt_nflog_info),
67	.me         = THIS_MODULE,
68};
69
70static int __init nflog_tg_init(void)
71{
72	return xt_register_target(&nflog_tg_reg);
73}
74
75static void __exit nflog_tg_exit(void)
76{
77	xt_unregister_target(&nflog_tg_reg);
78}
79
80module_init(nflog_tg_init);
81module_exit(nflog_tg_exit);