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/*
* (C) 2011 Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2011 Intra2net AG <http://www.intra2net.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 (or any
* later at your option) as published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nfnetlink_acct.h>
#include <linux/netfilter/xt_nfacct.h>
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_DESCRIPTION("Xtables: match for the extended accounting infrastructure");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_nfacct");
MODULE_ALIAS("ip6t_nfacct");
static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
int overquota;
const struct xt_nfacct_match_info *info = par->targinfo;
nfnl_acct_update(skb, info->nfacct);
overquota = nfnl_acct_overquota(xt_net(par), info->nfacct);
return overquota == NFACCT_UNDERQUOTA ? false : true;
}
static int
nfacct_mt_checkentry(const struct xt_mtchk_param *par)
{
struct xt_nfacct_match_info *info = par->matchinfo;
struct nf_acct *nfacct;
nfacct = nfnl_acct_find_get(par->net, info->name);
if (nfacct == NULL) {
pr_info_ratelimited("accounting object `%s' does not exists\n",
info->name);
return -ENOENT;
}
info->nfacct = nfacct;
return 0;
}
static void
nfacct_mt_destroy(const struct xt_mtdtor_param *par)
{
const struct xt_nfacct_match_info *info = par->matchinfo;
nfnl_acct_put(info->nfacct);
}
static struct xt_match nfacct_mt_reg __read_mostly = {
.name = "nfacct",
.family = NFPROTO_UNSPEC,
.checkentry = nfacct_mt_checkentry,
.match = nfacct_mt,
.destroy = nfacct_mt_destroy,
.matchsize = sizeof(struct xt_nfacct_match_info),
.usersize = offsetof(struct xt_nfacct_match_info, nfacct),
.me = THIS_MODULE,
};
static int __init nfacct_mt_init(void)
{
return xt_register_match(&nfacct_mt_reg);
}
static void __exit nfacct_mt_exit(void)
{
xt_unregister_match(&nfacct_mt_reg);
}
module_init(nfacct_mt_init);
module_exit(nfacct_mt_exit);
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