xt_comment.c revision a45049c51ce6a3fecf2a909b591b28164c927112 
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	.family		= AF_INET,
37	.me		= THIS_MODULE
38};
39
40static struct xt_match comment6_match = {
41	.name		= "comment",
42	.match		= match,
43	.matchsize	= sizeof(struct xt_comment_info),
44	.family		= AF_INET6,
45	.me		= THIS_MODULE
46};
47
48static int __init init(void)
49{
50	int ret;
51
52	ret = xt_register_match(&comment_match);
53	if (ret)
54		return ret;
55
56	ret = xt_register_match(&comment6_match);
57	if (ret)
58		xt_unregister_match(&comment_match);
59
60	return ret;
61}
62
63static void __exit fini(void)
64{
65	xt_unregister_match(&comment_match);
66	xt_unregister_match(&comment6_match);
67}
68
69module_init(init);
70module_exit(fini);
71