xt_NFLOG.c revision 7eb3558655aaa87a3e71a0c065dfaddda521fa6d 
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
17MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
18MODULE_DESCRIPTION("Xtables: packet logging to netlink using NFLOG");
19MODULE_LICENSE("GPL");
20MODULE_ALIAS("ipt_NFLOG");
21MODULE_ALIAS("ip6t_NFLOG");
22
23static unsigned int
24nflog_tg(struct sk_buff *skb, const struct xt_target_param *par)
25{
26	const struct xt_nflog_info *info = par->targinfo;
27	struct nf_loginfo li;
28
29	li.type		     = NF_LOG_TYPE_ULOG;
30	li.u.ulog.copy_len   = info->len;
31	li.u.ulog.group	     = info->group;
32	li.u.ulog.qthreshold = info->threshold;
33
34	nf_log_packet(par->target->family, par->hooknum, skb, par->in,
35	              par->out, &li, "%s", info->prefix);
36	return XT_CONTINUE;
37}
38
39static bool
40nflog_tg_check(const char *tablename, const void *entry,
41               const struct xt_target *target, void *targetinfo,
42               unsigned int hookmask)
43{
44	const struct xt_nflog_info *info = targetinfo;
45
46	if (info->flags & ~XT_NFLOG_MASK)
47		return false;
48	if (info->prefix[sizeof(info->prefix) - 1] != '\0')
49		return false;
50	return true;
51}
52
53static struct xt_target nflog_tg_reg[] __read_mostly = {
54	{
55		.name		= "NFLOG",
56		.family		= NFPROTO_IPV4,
57		.checkentry	= nflog_tg_check,
58		.target		= nflog_tg,
59		.targetsize	= sizeof(struct xt_nflog_info),
60		.me		= THIS_MODULE,
61	},
62	{
63		.name		= "NFLOG",
64		.family		= NFPROTO_IPV6,
65		.checkentry	= nflog_tg_check,
66		.target		= nflog_tg,
67		.targetsize	= sizeof(struct xt_nflog_info),
68		.me		= THIS_MODULE,
69	},
70};
71
72static int __init nflog_tg_init(void)
73{
74	return xt_register_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
75}
76
77static void __exit nflog_tg_exit(void)
78{
79	xt_unregister_targets(nflog_tg_reg, ARRAY_SIZE(nflog_tg_reg));
80}
81
82module_init(nflog_tg_init);
83module_exit(nflog_tg_exit);
84