1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Implements a dummy match to allow attaching comments to rules 4 * 5 * 2003-05-13 Brad Fisher (brad@info-link.net) 6 */ 7 8 #include <linux/module.h> 9 #include <linux/skbuff.h> 10 #include <linux/netfilter/x_tables.h> 11 #include <linux/netfilter/xt_comment.h> 12 13 MODULE_AUTHOR("Brad Fisher <brad@info-link.net>"); 14 MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment"); 15 MODULE_LICENSE("GPL"); 16 MODULE_ALIAS("ipt_comment"); 17 MODULE_ALIAS("ip6t_comment"); 18 19 static bool comment_mt(const struct sk_buff * skb,struct xt_action_param * par)20comment_mt(const struct sk_buff *skb, struct xt_action_param *par) 21 { 22 /* We always match */ 23 return true; 24 } 25 26 static struct xt_match comment_mt_reg __read_mostly = { 27 .name = "comment", 28 .revision = 0, 29 .family = NFPROTO_UNSPEC, 30 .match = comment_mt, 31 .matchsize = sizeof(struct xt_comment_info), 32 .me = THIS_MODULE, 33 }; 34 comment_mt_init(void)35static int __init comment_mt_init(void) 36 { 37 return xt_register_match(&comment_mt_reg); 38 } 39 comment_mt_exit(void)40static void __exit comment_mt_exit(void) 41 { 42 xt_unregister_match(&comment_mt_reg); 43 } 44 45 module_init(comment_mt_init); 46 module_exit(comment_mt_exit); 47