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/* Accouting handling for netfilter. */
/*
* (C) 2008 Krzysztof Piotr Oledzki <ole@ans.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/netfilter.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_acct.h>
static bool nf_ct_acct __read_mostly;
module_param_named(acct, nf_ct_acct, bool, 0644);
MODULE_PARM_DESC(acct, "Enable connection tracking flow accounting.");
#ifdef CONFIG_SYSCTL
static struct ctl_table acct_sysctl_table[] = {
{
.procname = "nf_conntrack_acct",
.data = &init_net.ct.sysctl_acct,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{}
};
#endif /* CONFIG_SYSCTL */
unsigned int
seq_print_acct(struct seq_file *s, const struct nf_conn *ct, int dir)
{
struct nf_conn_counter *acct;
acct = nf_conn_acct_find(ct);
if (!acct)
return 0;
return seq_printf(s, "packets=%llu bytes=%llu ",
(unsigned long long)atomic64_read(&acct[dir].packets),
(unsigned long long)atomic64_read(&acct[dir].bytes));
};
EXPORT_SYMBOL_GPL(seq_print_acct);
static struct nf_ct_ext_type acct_extend __read_mostly = {
.len = sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]),
.align = __alignof__(struct nf_conn_counter[IP_CT_DIR_MAX]),
.id = NF_CT_EXT_ACCT,
};
#ifdef CONFIG_SYSCTL
static int nf_conntrack_acct_init_sysctl(struct net *net)
{
struct ctl_table *table;
table = kmemdup(acct_sysctl_table, sizeof(acct_sysctl_table),
GFP_KERNEL);
if (!table)
goto out;
table[0].data = &net->ct.sysctl_acct;
/* Don't export sysctls to unprivileged users */
if (net->user_ns != &init_user_ns)
table[0].procname = NULL;
net->ct.acct_sysctl_header = register_net_sysctl(net, "net/netfilter",
table);
if (!net->ct.acct_sysctl_header) {
printk(KERN_ERR "nf_conntrack_acct: can't register to sysctl.\n");
goto out_register;
}
return 0;
out_register:
kfree(table);
out:
return -ENOMEM;
}
static void nf_conntrack_acct_fini_sysctl(struct net *net)
{
struct ctl_table *table;
table = net->ct.acct_sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(net->ct.acct_sysctl_header);
kfree(table);
}
#else
static int nf_conntrack_acct_init_sysctl(struct net *net)
{
return 0;
}
static void nf_conntrack_acct_fini_sysctl(struct net *net)
{
}
#endif
int nf_conntrack_acct_pernet_init(struct net *net)
{
net->ct.sysctl_acct = nf_ct_acct;
return nf_conntrack_acct_init_sysctl(net);
}
void nf_conntrack_acct_pernet_fini(struct net *net)
{
nf_conntrack_acct_fini_sysctl(net);
}
int nf_conntrack_acct_init(void)
{
int ret = nf_ct_extend_register(&acct_extend);
if (ret < 0)
pr_err("nf_conntrack_acct: Unable to register extension\n");
return ret;
}
void nf_conntrack_acct_fini(void)
{
nf_ct_extend_unregister(&acct_extend);
}
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