net/netfilter/xt_comment.c

   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, 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);