xt_comment.c (1094B)
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 13MODULE_AUTHOR("Brad Fisher <brad@info-link.net>"); 14MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment"); 15MODULE_LICENSE("GPL"); 16MODULE_ALIAS("ipt_comment"); 17MODULE_ALIAS("ip6t_comment"); 18 19static bool 20comment_mt(const struct sk_buff *skb, struct xt_action_param *par) 21{ 22 /* We always match */ 23 return true; 24} 25 26static 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 35static int __init comment_mt_init(void) 36{ 37 return xt_register_match(&comment_mt_reg); 38} 39 40static void __exit comment_mt_exit(void) 41{ 42 xt_unregister_match(&comment_mt_reg); 43} 44 45module_init(comment_mt_init); 46module_exit(comment_mt_exit);