[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(void *priv, struct sk_buff *skb,
		     const struct nf_hook_state *state)
{
	return ip6t_do_table(skb, state, state->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
06198b34	35	ip6table_filter_hook(void priv, struct sk_buff skb,
238e54c9	36	const struct nf_hook_state *state)
43de9dfe	37	{
6cb8ff3f	38	return ip6t_do_table(skb, state, state->net->ipv6.ip6table_filter);
1da177e4 LT	39	}
1da177e4 LT	40
2b95efe7	41	static struct nf_hook_ops *filter_ops __read_mostly;
1da177e4 LT	42
1da177e4 LT	43	/* Default to forward because I got too much mail already. */
523f610e	44	static bool forward = true;
1da177e4 LT	45	module_param(forward, bool, 0000);
1da177e4 LT	46
8280aa61 AD	47	static int __net_init ip6table_filter_net_init(struct net *net)
8280aa61 AD	48	{
e3eaa991 JE	49	struct ip6t_replace *repl;
	50
	51	repl = ip6t_alloc_initial_table(&packet_filter);
	52	if (repl == NULL)
	53	return -ENOMEM;
	54	/* Entry 1 is the FORWARD hook */
	55	((struct ip6t_standard *)repl->entries)[1].target.verdict =
523f610e	56	forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
e3eaa991	57
8280aa61	58	net->ipv6.ip6table_filter =
e3eaa991 JE	59	ip6t_register_table(net, &packet_filter, repl);
e3eaa991 JE	60	kfree(repl);
8c6ffba0	61	return PTR_ERR_OR_ZERO(net->ipv6.ip6table_filter);
8280aa61 AD	62	}
	63
	64	static void __net_exit ip6table_filter_net_exit(struct net *net)
	65	{
f54e9367	66	ip6t_unregister_table(net, net->ipv6.ip6table_filter);
8280aa61 AD	67	}
	68
	69	static struct pernet_operations ip6table_filter_net_ops = {
	70	.init = ip6table_filter_net_init,
	71	.exit = ip6table_filter_net_exit,
	72	};
	73
65b4b4e8	74	static int __init ip6table_filter_init(void)
1da177e4 LT	75	{
	76	int ret;
	77
8280aa61 AD	78	ret = register_pernet_subsys(&ip6table_filter_net_ops);
	79	if (ret < 0)
	80	return ret;
1da177e4 LT	81
1da177e4 LT	82	/* Register hooks */
2b95efe7 JE	83	filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
	84	if (IS_ERR(filter_ops)) {
	85	ret = PTR_ERR(filter_ops);
1da177e4	86	goto cleanup_table;
2b95efe7	87	}
1da177e4	88
1da177e4 LT	89	return ret;
1da177e4 LT	90
1da177e4	91	cleanup_table:
8280aa61	92	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	93	return ret;
	94	}
	95
65b4b4e8	96	static void __exit ip6table_filter_fini(void)
1da177e4	97	{
2b95efe7	98	xt_hook_unlink(&packet_filter, filter_ops);
8280aa61	99	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	100	}
1da177e4 LT	101
65b4b4e8 AM	102	module_init(ip6table_filter_init);
65b4b4e8 AM	103	module_exit(ip6table_filter_fini);