xt_comment.c revision d3c5ee6d545b5372fd525ebe16988a5b6efeceb0 
1/*
2 * Implements a dummy match to allow attaching comments to rules
3 *
4 * 2003-05-13 Brad Fisher (brad@info-link.net)
5 */
6
7#include <linux/module.h>
8#include <linux/skbuff.h>
9#include <linux/netfilter/x_tables.h>
10#include <linux/netfilter/xt_comment.h>
11
12MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
13MODULE_DESCRIPTION("iptables comment match module");
14MODULE_LICENSE("GPL");
15MODULE_ALIAS("ipt_comment");
16MODULE_ALIAS("ip6t_comment");
17
18static bool
19comment_mt(const struct sk_buff *skb, const struct net_device *in,
20           const struct net_device *out, const struct xt_match *match,
21           const void *matchinfo, int offset, unsigned int protooff,
22           bool *hotdrop)
23{
24	/* We always match */
25	return true;
26}
27
28static struct xt_match comment_mt_reg[] __read_mostly = {
29	{
30		.name		= "comment",
31		.family		= AF_INET,
32		.match		= comment_mt,
33		.matchsize	= sizeof(struct xt_comment_info),
34		.me		= THIS_MODULE
35	},
36	{
37		.name		= "comment",
38		.family		= AF_INET6,
39		.match		= comment_mt,
40		.matchsize	= sizeof(struct xt_comment_info),
41		.me		= THIS_MODULE
42	},
43};
44
45static int __init comment_mt_init(void)
46{
47	return xt_register_matches(comment_mt_reg, ARRAY_SIZE(comment_mt_reg));
48}
49
50static void __exit comment_mt_exit(void)
51{
52	xt_unregister_matches(comment_mt_reg, ARRAY_SIZE(comment_mt_reg));
53}
54
55module_init(comment_mt_init);
56module_exit(comment_mt_exit);
57