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 19 comment_mt(const struct sk_buff *skb, const 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 34 static int __init comment_mt_init(void) 35 { 36 return xt_register_match(&comment_mt_reg); 37 } 38 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