[deliverable/linux.git] / net / ipv6 / netfilter / ip6table_filter.c

/*
 * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
 *
 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("ip6tables filter table");

#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
			    (1 << NF_INET_FORWARD) | \
			    (1 << NF_INET_LOCAL_OUT))

static const struct xt_table packet_filter = {
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.me		= THIS_MODULE,
	.af		= NFPROTO_IPV6,
	.priority	= NF_IP6_PRI_FILTER,
};

/* The work comes in here from netfilter.c. */
static unsigned int
ip6table_filter_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
		     const struct net_device *in, const struct net_device *out,
		     int (*okfn)(struct sk_buff *))
{
	const struct net *net = dev_net((in != NULL) ? in : out);

	return ip6t_do_table(skb, ops->hooknum, in, out,
			     net->ipv6.ip6table_filter);
}

static struct nf_hook_ops *filter_ops __read_mostly;

/* Default to forward because I got too much mail already. */
static bool forward = true;
module_param(forward, bool, 0000);

static int __net_init ip6table_filter_net_init(struct net *net)
{
	struct ip6t_replace *repl;

	repl = ip6t_alloc_initial_table(&packet_filter);
	if (repl == NULL)
		return -ENOMEM;
	/* Entry 1 is the FORWARD hook */
	((struct ip6t_standard *)repl->entries)[1].target.verdict =
		forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;

	net->ipv6.ip6table_filter =
		ip6t_register_table(net, &packet_filter, repl);
	kfree(repl);
	return PTR_ERR_OR_ZERO(net->ipv6.ip6table_filter);
}

static void __net_exit ip6table_filter_net_exit(struct net *net)
{
	ip6t_unregister_table(net, net->ipv6.ip6table_filter);
}

static struct pernet_operations ip6table_filter_net_ops = {
	.init = ip6table_filter_net_init,
	.exit = ip6table_filter_net_exit,
};

static int __init ip6table_filter_init(void)
{
	int ret;

	ret = register_pernet_subsys(&ip6table_filter_net_ops);
	if (ret < 0)
		return ret;

	/* Register hooks */
	filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
	if (IS_ERR(filter_ops)) {
		ret = PTR_ERR(filter_ops);
		goto cleanup_table;
	}

	return ret;

 cleanup_table:
	unregister_pernet_subsys(&ip6table_filter_net_ops);
	return ret;
}

static void __exit ip6table_filter_fini(void)
{
	xt_hook_unlink(&packet_filter, filter_ops);
	unregister_pernet_subsys(&ip6table_filter_net_ops);
}

module_init(ip6table_filter_init);
module_exit(ip6table_filter_fini);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
	3	*
	4	* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
	5	* Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/moduleparam.h>
	14	#include <linux/netfilter_ipv6/ip6_tables.h>
5a0e3ad6	15	#include <linux/slab.h>
1da177e4 LT	16
	17	MODULE_LICENSE("GPL");
	18	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	19	MODULE_DESCRIPTION("ip6tables filter table");
	20
6e23ae2a PM	21	#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) \| \
	22	(1 << NF_INET_FORWARD) \| \
	23	(1 << NF_INET_LOCAL_OUT))
1da177e4	24
35aad0ff	25	static const struct xt_table packet_filter = {
1da177e4 LT	26	.name = "filter",
1da177e4 LT	27	.valid_hooks = FILTER_VALID_HOOKS,
1da177e4	28	.me = THIS_MODULE,
f88e6a8a	29	.af = NFPROTO_IPV6,
2b95efe7	30	.priority = NF_IP6_PRI_FILTER,
1da177e4 LT	31	};
	32
	33	/* The work comes in here from netfilter.c. */
	34	static unsigned int
795aa6ef	35	ip6table_filter_hook(const struct nf_hook_ops ops, struct sk_buff skb,
737535c5 JE	36	const struct net_device in, const struct net_device out,
737535c5 JE	37	int (okfn)(struct sk_buff ))
43de9dfe	38	{
2b21e051	39	const struct net *net = dev_net((in != NULL) ? in : out);
1da177e4	40
795aa6ef PM	41	return ip6t_do_table(skb, ops->hooknum, in, out,
795aa6ef PM	42	net->ipv6.ip6table_filter);
1da177e4 LT	43	}
1da177e4 LT	44
2b95efe7	45	static struct nf_hook_ops *filter_ops __read_mostly;
1da177e4 LT	46
1da177e4 LT	47	/* Default to forward because I got too much mail already. */
523f610e	48	static bool forward = true;
1da177e4 LT	49	module_param(forward, bool, 0000);
1da177e4 LT	50
8280aa61 AD	51	static int __net_init ip6table_filter_net_init(struct net *net)
8280aa61 AD	52	{
e3eaa991 JE	53	struct ip6t_replace *repl;
	54
	55	repl = ip6t_alloc_initial_table(&packet_filter);
	56	if (repl == NULL)
	57	return -ENOMEM;
	58	/* Entry 1 is the FORWARD hook */
	59	((struct ip6t_standard *)repl->entries)[1].target.verdict =
523f610e	60	forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
e3eaa991	61
8280aa61	62	net->ipv6.ip6table_filter =
e3eaa991 JE	63	ip6t_register_table(net, &packet_filter, repl);
e3eaa991 JE	64	kfree(repl);
8c6ffba0	65	return PTR_ERR_OR_ZERO(net->ipv6.ip6table_filter);
8280aa61 AD	66	}
	67
	68	static void __net_exit ip6table_filter_net_exit(struct net *net)
	69	{
f54e9367	70	ip6t_unregister_table(net, net->ipv6.ip6table_filter);
8280aa61 AD	71	}
	72
	73	static struct pernet_operations ip6table_filter_net_ops = {
	74	.init = ip6table_filter_net_init,
	75	.exit = ip6table_filter_net_exit,
	76	};
	77
65b4b4e8	78	static int __init ip6table_filter_init(void)
1da177e4 LT	79	{
	80	int ret;
	81
8280aa61 AD	82	ret = register_pernet_subsys(&ip6table_filter_net_ops);
	83	if (ret < 0)
	84	return ret;
1da177e4 LT	85
1da177e4 LT	86	/* Register hooks */
2b95efe7 JE	87	filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
	88	if (IS_ERR(filter_ops)) {
	89	ret = PTR_ERR(filter_ops);
1da177e4	90	goto cleanup_table;
2b95efe7	91	}
1da177e4	92
1da177e4 LT	93	return ret;
1da177e4 LT	94
1da177e4	95	cleanup_table:
8280aa61	96	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	97	return ret;
	98	}
	99
65b4b4e8	100	static void __exit ip6table_filter_fini(void)
1da177e4	101	{
2b95efe7	102	xt_hook_unlink(&packet_filter, filter_ops);
8280aa61	103	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	104	}
1da177e4 LT	105
65b4b4e8 AM	106	module_init(ip6table_filter_init);
65b4b4e8 AM	107	module_exit(ip6table_filter_fini);