/* 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.
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
#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_acct *acct;
|
struct nf_conn_counter *counter;
|
|
acct = nf_conn_acct_find(ct);
|
if (!acct)
|
return 0;
|
|
counter = acct->counter;
|
seq_printf(s, "packets=%llu bytes=%llu ",
|
(unsigned long long)atomic64_read(&counter[dir].packets),
|
(unsigned long long)atomic64_read(&counter[dir].bytes));
|
|
return 0;
|
};
|
EXPORT_SYMBOL_GPL(seq_print_acct);
|
|
static const struct nf_ct_ext_type acct_extend = {
|
.len = sizeof(struct nf_conn_acct),
|
.align = __alignof__(struct nf_conn_acct),
|
.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) {
|
pr_err("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("Unable to register extension\n");
|
return ret;
|
}
|
|
void nf_conntrack_acct_fini(void)
|
{
|
nf_ct_extend_unregister(&acct_extend);
|
}
|
