LXR linux/net/netfilter/xt

   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);
  47