Linux Kernel  3.7.1
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xt_nfacct.c
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1 /*
2  * (C) 2011 Pablo Neira Ayuso <[email protected]>
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>
15 
16 MODULE_AUTHOR("Pablo Neira Ayuso <[email protected]>");
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);