linux/net/netfilter/xt_nfacct.c
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   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
  16MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  17MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure");
  18MODULE_LICENSE("GPL");
  19MODULE_ALIAS("ipt_nfacct");
  20MODULE_ALIAS("ip6t_nfacct");
  21
  22static 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
  31static int
  32nfacct_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
  47static void
  48nfacct_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
  55static 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
  65static int __init nfacct_mt_init(void)
  66{
  67        return xt_register_match(&nfacct_mt_reg);
  68}
  69
  70static void __exit nfacct_mt_exit(void)
  71{
  72        xt_unregister_match(&nfacct_mt_reg);
  73}
  74
  75module_init(nfacct_mt_init);
  76module_exit(nfacct_mt_exit);
  77
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