net/netfilter/xt_nfacct.c

   1 /*
   2  * (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org>
   3  * (C) 2011 Intra2net AG <http://www.intra2net.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 (or any
   7  * later at your option) as published by the Free Software Foundation.
   8  */
   9 #include <linux/module.h>
  10 #include <linux/skbuff.h>
  11
  12 #include <linux/netfilter/x_tables.h>
  13 #include <linux/netfilter/nfnetlink_acct.h>
  14 #include <linux/netfilter/xt_nfacct.h>
  15
  16 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  17 MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure");
  18 MODULE_LICENSE("GPL");
  19 MODULE_ALIAS("ipt_nfacct");
  20 MODULE_ALIAS("ip6t_nfacct");
  21
  22 static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
  23 {
  24         const struct xt_nfacct_match_info *info = par->targinfo;
  25
  26         nfnl_acct_update(skb, info->nfacct);
  27
  28         return true;
  29 }
  30
  31 static int
  32 nfacct_mt_checkentry(const struct xt_mtchk_param *par)
  33 {
  34         struct xt_nfacct_match_info *info = par->matchinfo;
  35         struct nf_acct *nfacct;
  36
  37         nfacct = nfnl_acct_find_get(info->name);
  38         if (nfacct == NULL) {
  39                 pr_info("xt_nfacct: accounting object with name `%s' "
  40                         "does not exists\n", info->name);
  41                 return -ENOENT;
  42         }
  43         info->nfacct = nfacct;
  44         return 0;
  45 }
  46
  47 static void
  48 nfacct_mt_destroy(const struct xt_mtdtor_param *par)
  49 {
  50         const struct xt_nfacct_match_info *info = par->matchinfo;
  51
  52         nfnl_acct_put(info->nfacct);
  53 }
  54
  55 static struct xt_match nfacct_mt_reg __read_mostly = {
  56         .name       = "nfacct",
  57         .family     = NFPROTO_UNSPEC,
  58         .checkentry = nfacct_mt_checkentry,
  59         .match      = nfacct_mt,
  60         .destroy    = nfacct_mt_destroy,
  61         .matchsize  = sizeof(struct xt_nfacct_match_info),
  62         .me         = THIS_MODULE,
  63 };
  64
  65 static int __init nfacct_mt_init(void)
  66 {
  67         return xt_register_match(&nfacct_mt_reg);
  68 }
  69
  70 static void __exit nfacct_mt_exit(void)
  71 {
  72         xt_unregister_match(&nfacct_mt_reg);
  73 }
  74
  75 module_init(nfacct_mt_init);
  76 module_exit(nfacct_mt_exit);