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("iptables comment match module");
  14 MODULE_LICENSE("GPL");
  15 MODULE_ALIAS("ipt_comment");
  16 MODULE_ALIAS("ip6t_comment");
  17
  18 static bool
  19 match(const struct sk_buff *skb,
  20       const struct net_device *in,
  21       const struct net_device *out,
  22       const struct xt_match *match,
  23       const void *matchinfo,
  24       int offset,
  25       unsigned int protooff,
  26       bool *hotdrop)
  27 {
  28         /* We always match */
  29         return true;
  30 }
  31
  32 static struct xt_match xt_comment_match[] __read_mostly = {
  33         {
  34                 .name           = "comment",
  35                 .family         = AF_INET,
  36                 .match          = match,
  37                 .matchsize      = sizeof(struct xt_comment_info),
  38                 .me             = THIS_MODULE
  39         },
  40         {
  41                 .name           = "comment",
  42                 .family         = AF_INET6,
  43                 .match          = match,
  44                 .matchsize      = sizeof(struct xt_comment_info),
  45                 .me             = THIS_MODULE
  46         },
  47 };
  48
  49 static int __init xt_comment_init(void)
  50 {
  51         return xt_register_matches(xt_comment_match,
  52                                    ARRAY_SIZE(xt_comment_match));
  53 }
  54
  55 static void __exit xt_comment_fini(void)
  56 {
  57         xt_unregister_matches(xt_comment_match, ARRAY_SIZE(xt_comment_match));
  58 }
  59
  60 module_init(xt_comment_init);
  61 module_exit(xt_comment_fini);