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 
12 MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
13 MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment");
14 MODULE_LICENSE("GPL");
15 MODULE_ALIAS("ipt_comment");
16 MODULE_ALIAS("ip6t_comment");
17 
18 static bool
comment_mt(const struct sk_buff * skb,struct xt_action_param * par)19 comment_mt(const struct sk_buff *skb, struct xt_action_param *par)
20 {
21 	/* We always match */
22 	return true;
23 }
24 
25 static struct xt_match comment_mt_reg __read_mostly = {
26 	.name      = "comment",
27 	.revision  = 0,
28 	.family    = NFPROTO_UNSPEC,
29 	.match     = comment_mt,
30 	.matchsize = sizeof(struct xt_comment_info),
31 	.me        = THIS_MODULE,
32 };
33 
comment_mt_init(void)34 static int __init comment_mt_init(void)
35 {
36 	return xt_register_match(&comment_mt_reg);
37 }
38 
comment_mt_exit(void)39 static void __exit comment_mt_exit(void)
40 {
41 	xt_unregister_match(&comment_mt_reg);
42 }
43 
44 module_init(comment_mt_init);
45 module_exit(comment_mt_exit);
46