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 nf_loginfo li;
29	struct net *net = dev_net(par->in ? par->in : par->out);
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
36	nfulnl_log_packet(net, par->family, par->hooknum, skb, par->in,
37			  par->out, &li, info->prefix);
38	return XT_CONTINUE;
39}
40
41static int nflog_tg_check(const struct xt_tgchk_param *par)
42{
43	const struct xt_nflog_info *info = par->targinfo;
44
45	if (info->flags & ~XT_NFLOG_MASK)
46		return -EINVAL;
47	if (info->prefix[sizeof(info->prefix) - 1] != '\0')
48		return -EINVAL;
49	return 0;
50}
51
52static struct xt_target nflog_tg_reg __read_mostly = {
53	.name       = "NFLOG",
54	.revision   = 0,
55	.family     = NFPROTO_UNSPEC,
56	.checkentry = nflog_tg_check,
57	.target     = nflog_tg,
58	.targetsize = sizeof(struct xt_nflog_info),
59	.me         = THIS_MODULE,
60};
61
62static int __init nflog_tg_init(void)
63{
64	return xt_register_target(&nflog_tg_reg);
65}
66
67static void __exit nflog_tg_exit(void)
68{
69	xt_unregister_target(&nflog_tg_reg);
70}
71
72module_init(nflog_tg_init);
73module_exit(nflog_tg_exit);
74