xt_NFLOG.c revision 92f3b2b1bc968caaabee8cd78bee75ab7c4af74e 
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->family, par->hooknum, skb, par->in,
35	              par->out, &li, "%s", info->prefix);
36	return XT_CONTINUE;
37}
38
39static bool nflog_tg_check(const struct xt_tgchk_param *par)
40{
41	const struct xt_nflog_info *info = par->targinfo;
42
43	if (info->flags & ~XT_NFLOG_MASK)
44		return false;
45	if (info->prefix[sizeof(info->prefix) - 1] != '\0')
46		return false;
47	return true;
48}
49
50static struct xt_target nflog_tg_reg __read_mostly = {
51	.name       = "NFLOG",
52	.revision   = 0,
53	.family     = NFPROTO_UNSPEC,
54	.checkentry = nflog_tg_check,
55	.target     = nflog_tg,
56	.targetsize = sizeof(struct xt_nflog_info),
57	.me         = THIS_MODULE,
58};
59
60static int __init nflog_tg_init(void)
61{
62	return xt_register_target(&nflog_tg_reg);
63}
64
65static void __exit nflog_tg_exit(void)
66{
67	xt_unregister_target(&nflog_tg_reg);
68}
69
70module_init(nflog_tg_init);
71module_exit(nflog_tg_exit);
72