linux/net/netfilter/xt_comment.c
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   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
  12MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
  13MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment");
  14MODULE_LICENSE("GPL");
  15MODULE_ALIAS("ipt_comment");
  16MODULE_ALIAS("ip6t_comment");
  17
  18static bool
  19comment_mt(const struct sk_buff *skb, struct xt_action_param *par)
  20{
  21        /* We always match */
  22        return true;
  23}
  24
  25static 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
  34static int __init comment_mt_init(void)
  35{
  36        return xt_register_match(&comment_mt_reg);
  37}
  38
  39static void __exit comment_mt_exit(void)
  40{
  41        xt_unregister_match(&comment_mt_reg);
  42}
  43
  44module_init(comment_mt_init);
  45module_exit(comment_mt_exit);
  46
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