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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
  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, const struct xt_match_param *par)
  20 {
  21         /* We always match */
  22         return true;
  23 }
  24
  25 static struct xt_match comment_mt_reg[] __read_mostly = {
  26         {
  27                 .name           = "comment",
  28                 .family         = NFPROTO_IPV4,
  29                 .match          = comment_mt,
  30                 .matchsize      = sizeof(struct xt_comment_info),
  31                 .me             = THIS_MODULE
  32         },
  33         {
  34                 .name           = "comment",
  35                 .family         = NFPROTO_IPV6,
  36                 .match          = comment_mt,
  37                 .matchsize      = sizeof(struct xt_comment_info),
  38                 .me             = THIS_MODULE
  39         },
  40 };
  41
  42 static int __init comment_mt_init(void)
  43 {
  44         return xt_register_matches(comment_mt_reg, ARRAY_SIZE(comment_mt_reg));
  45 }
  46
  47 static void __exit comment_mt_exit(void)
  48 {
  49         xt_unregister_matches(comment_mt_reg, ARRAY_SIZE(comment_mt_reg));
  50 }
  51
  52 module_init(comment_mt_init);
  53 module_exit(comment_mt_exit);