xt_comment.c revision c49867347404c46f137a261643ed4fce4376f324 
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 int
19match(const struct sk_buff *skb,
20      const struct net_device *in,
21      const struct net_device *out,
22      const struct xt_match *match,
23      const void *matchinfo,
24      int offset,
25      unsigned int protooff,
26      int *hotdrop)
27{
28	/* We always match */
29	return 1;
30}
31
32static struct xt_match comment_match = {
33	.name		= "comment",
34	.match		= match,
35	.matchsize	= sizeof(struct xt_comment_info),
36	.me		= THIS_MODULE
37};
38
39static struct xt_match comment6_match = {
40	.name		= "comment",
41	.match		= match,
42	.matchsize	= sizeof(struct xt_comment_info),
43	.me		= THIS_MODULE
44};
45
46static int __init init(void)
47{
48	int ret;
49
50	ret = xt_register_match(AF_INET, &comment_match);
51	if (ret)
52		return ret;
53
54	ret = xt_register_match(AF_INET6, &comment6_match);
55	if (ret)
56		xt_unregister_match(AF_INET, &comment_match);
57
58	return ret;
59}
60
61static void __exit fini(void)
62{
63	xt_unregister_match(AF_INET, &comment_match);
64	xt_unregister_match(AF_INET6, &comment6_match);
65}
66
67module_init(init);
68module_exit(fini);
69