[linux.git] / net / netfilter / nf_conntrack_timestamp.c

/*
 * (C) 2010 Pablo Neira Ayuso <[email protected]>
 *
 * 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;

	net->ct.tstamp_sysctl_header = register_net_sysctl_table(net,
			nf_net_netfilter_sysctl_path, 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_init(struct net *net)
{
	int ret;

	net->ct.sysctl_tstamp = nf_ct_tstamp;

	if (net_eq(net, &init_net)) {
		ret = nf_ct_extend_register(&tstamp_extend);
		if (ret < 0) {
			printk(KERN_ERR "nf_ct_tstamp: Unable to register "
					"extension\n");
			goto out_extend_register;
		}
	}

	ret = nf_conntrack_tstamp_init_sysctl(net);
	if (ret < 0)
		goto out_sysctl;

	return 0;

out_sysctl:
	if (net_eq(net, &init_net))
		nf_ct_extend_unregister(&tstamp_extend);
out_extend_register:
	return ret;
}

void nf_conntrack_tstamp_fini(struct net *net)
{
	nf_conntrack_tstamp_fini_sysctl(net);
	if (net_eq(net, &init_net))
		nf_ct_extend_unregister(&tstamp_extend);
}
Commit	Line	Data
a992ca2a PNA	1	/*
	2	* (C) 2010 Pablo Neira Ayuso <[email protected]>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation (or any later at your option).
	7	*/
	8
	9	#include <linux/netfilter.h>
	10	#include <linux/slab.h>
	11	#include <linux/kernel.h>
	12	#include <linux/moduleparam.h>
	13
	14	#include <net/netfilter/nf_conntrack.h>
	15	#include <net/netfilter/nf_conntrack_extend.h>
	16	#include <net/netfilter/nf_conntrack_timestamp.h>
	17
eb939922	18	static bool nf_ct_tstamp __read_mostly;
a992ca2a PNA	19
	20	module_param_named(tstamp, nf_ct_tstamp, bool, 0644);
	21	MODULE_PARM_DESC(tstamp, "Enable connection tracking flow timestamping.");
	22
	23	#ifdef CONFIG_SYSCTL
	24	static struct ctl_table tstamp_sysctl_table[] = {
	25	{
	26	.procname = "nf_conntrack_timestamp",
	27	.data = &init_net.ct.sysctl_tstamp,
	28	.maxlen = sizeof(unsigned int),
	29	.mode = 0644,
	30	.proc_handler = proc_dointvec,
	31	},
	32	{}
	33	};
	34	#endif /* CONFIG_SYSCTL */
	35
	36	static struct nf_ct_ext_type tstamp_extend __read_mostly = {
	37	.len = sizeof(struct nf_conn_tstamp),
	38	.align = __alignof__(struct nf_conn_tstamp),
	39	.id = NF_CT_EXT_TSTAMP,
	40	};
	41
	42	#ifdef CONFIG_SYSCTL
	43	static int nf_conntrack_tstamp_init_sysctl(struct net *net)
	44	{
	45	struct ctl_table *table;
	46
	47	table = kmemdup(tstamp_sysctl_table, sizeof(tstamp_sysctl_table),
	48	GFP_KERNEL);
	49	if (!table)
	50	goto out;
	51
	52	table[0].data = &net->ct.sysctl_tstamp;
	53
	54	net->ct.tstamp_sysctl_header = register_net_sysctl_table(net,
	55	nf_net_netfilter_sysctl_path, table);
	56	if (!net->ct.tstamp_sysctl_header) {
	57	printk(KERN_ERR "nf_ct_tstamp: can't register to sysctl.\n");
	58	goto out_register;
	59	}
	60	return 0;
	61
	62	out_register:
	63	kfree(table);
	64	out:
	65	return -ENOMEM;
	66	}
	67
	68	static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
	69	{
	70	struct ctl_table *table;
	71
	72	table = net->ct.tstamp_sysctl_header->ctl_table_arg;
	73	unregister_net_sysctl_table(net->ct.tstamp_sysctl_header);
	74	kfree(table);
	75	}
	76	#else
	77	static int nf_conntrack_tstamp_init_sysctl(struct net *net)
	78	{
	79	return 0;
	80	}
	81
	82	static void nf_conntrack_tstamp_fini_sysctl(struct net *net)
83	{
84	}
85	#endif
86
87	int nf_conntrack_tstamp_init(struct net *net)
88	{
89	int ret;
90
91	net->ct.sysctl_tstamp = nf_ct_tstamp;
92
93	if (net_eq(net, &init_net)) {
94	ret = nf_ct_extend_register(&tstamp_extend);
95	if (ret < 0) {
96	printk(KERN_ERR "nf_ct_tstamp: Unable to register "
97	"extension\n");
98	goto out_extend_register;
99	}
100	}
101
102	ret = nf_conntrack_tstamp_init_sysctl(net);
103	if (ret < 0)
104	goto out_sysctl;
105
106	return 0;
107
108	out_sysctl:
109	if (net_eq(net, &init_net))
110	nf_ct_extend_unregister(&tstamp_extend);
111	out_extend_register:
112	return ret;
113	}
114
115	void nf_conntrack_tstamp_fini(struct net *net)
116	{
117	nf_conntrack_tstamp_fini_sysctl(net);
118	if (net_eq(net, &init_net))
119	nf_ct_extend_unregister(&tstamp_extend);
120	}