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/*
* (C) 2010 Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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 (or any later at your option).
*/
#include <linux/netfilter.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_timestamp.h>
static bool nf_ct_tstamp __read_mostly;
module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
#ifdef CONFIG_SYSCTL
static struct ctl_table tstamp_sysctl_table[] = {
{
.procname = "nf_conntrack_timestamp",
.data = &init_net.ct.sysctl_tstamp,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
{}
};
#endif /* CONFIG_SYSCTL */
static struct nf_ct_ext_type tstamp_extend __read_mostly = {
.len = sizeof(struct nf_conn_tstamp),
.align = __alignof__(struct nf_conn_tstamp),
.id = NF_CT_EXT_TSTAMP,
};
#ifdef CONFIG_SYSCTL
static int nf_conntrack_tstamp_init_sysctl(struct net *net)
{
struct ctl_table *table;
table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table),
GFP_KERNEL);
if (!table)
goto out;
table[0].data = &net->ct.sysctl_tstamp;
/* Don't export sysctls to unprivileged users */
if (net->user_ns != &init_user_ns)
table[0].procname = NULL;
net->ct.tstamp_sysctl_header = register_net_sysctl(net, "net/netfilter",
table);
if (!net->ct.tstamp_sysctl_header) {
printk(KERN_ERR "nf_ct_tstamp: can't register to sysctl.\n");
goto out_register;
}
return 0;
out_register:
kfree(table);
out:
return -ENOMEM;
}
static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
{
struct ctl_table *table;
table = net->ct.tstamp_sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(net->ct.tstamp_sysctl_header);
kfree(table);
}
#else
static int nf_conntrack_tstamp_init_sysctl(struct net *net)
{
return 0;
}
static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
{
}
#endif
int nf_conntrack_tstamp_pernet_init(struct net *net)
{
net->ct.sysctl_tstamp = nf_ct_tstamp;
return nf_conntrack_tstamp_init_sysctl(net);
}
void nf_conntrack_tstamp_pernet_fini(struct net *net)
{
nf_conntrack_tstamp_fini_sysctl(net);
}
int nf_conntrack_tstamp_init(void)
{
int ret;
ret = nf_ct_extend_register(&tstamp_extend);
if (ret < 0)
pr_err("nf_ct_tstamp: Unable to register extension\n");
return ret;
}
void nf_conntrack_tstamp_fini(void)
{
nf_ct_extend_unregister(&tstamp_extend);
}
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