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Linux/net/netfilter/xt_comment.c

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  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 
 13 MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
 14 MODULE_DESCRIPTION("Xtables: No-op match which can be tagged with a comment");
 15 MODULE_LICENSE("GPL");
 16 MODULE_ALIAS("ipt_comment");
 17 MODULE_ALIAS("ip6t_comment");
 18 
 19 static bool
 20 comment_mt(const struct sk_buff *skb, struct xt_action_param *par)
 21 {
 22         /* We always match */
 23         return true;
 24 }
 25 
 26 static 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 
 35 static int __init comment_mt_init(void)
 36 {
 37         return xt_register_match(&comment_mt_reg);
 38 }
 39 
 40 static void __exit comment_mt_exit(void)
 41 {
 42         xt_unregister_match(&comment_mt_reg);
 43 }
 44 
 45 module_init(comment_mt_init);
 46 module_exit(comment_mt_exit);
 47 

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