[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>

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 struct
{
	struct ip6t_replace repl;
	struct ip6t_standard entries[3];
	struct ip6t_error term;
} initial_table __net_initdata = {
	.repl = {
		.name = "filter",
		.valid_hooks = FILTER_VALID_HOOKS,
		.num_entries = 4,
		.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
		.hook_entry = {
			[NF_INET_LOCAL_IN] = 0,
			[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
			[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
		},
		.underflow = {
			[NF_INET_LOCAL_IN] = 0,
			[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
			[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
		},
	},
	.entries = {
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_IN */
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* FORWARD */
		IP6T_STANDARD_INIT(NF_ACCEPT),	/* LOCAL_OUT */
	},
	.term = IP6T_ERROR_INIT,		/* ERROR */
};

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(unsigned int hook, 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, hook, 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 int forward = NF_ACCEPT;
module_param(forward, bool, 0000);

static int __net_init ip6table_filter_net_init(struct net *net)
{
	/* Register table */
	net->ipv6.ip6table_filter =
		ip6t_register_table(net, &packet_filter, &initial_table.repl);
	if (IS_ERR(net->ipv6.ip6table_filter))
		return PTR_ERR(net->ipv6.ip6table_filter);
	return 0;
}

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;

	if (forward < 0 || forward > NF_MAX_VERDICT) {
		printk("iptables forward must be 0 or 1\n");
		return -EINVAL;
	}

	/* Entry 1 is the FORWARD hook */
	initial_table.entries[1].target.verdict = -forward - 1;

	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>
	15
	16	MODULE_LICENSE("GPL");
	17	MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
	18	MODULE_DESCRIPTION("ip6tables filter table");
	19
6e23ae2a PM	20	#define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) \| \
	21	(1 << NF_INET_FORWARD) \| \
	22	(1 << NF_INET_LOCAL_OUT))
1da177e4	23
1da177e4 LT	24	static struct
	25	{
	26	struct ip6t_replace repl;
	27	struct ip6t_standard entries[3];
	28	struct ip6t_error term;
8280aa61	29	} initial_table __net_initdata = {
3c2ad469 PM	30	.repl = {
	31	.name = "filter",
	32	.valid_hooks = FILTER_VALID_HOOKS,
	33	.num_entries = 4,
	34	.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
	35	.hook_entry = {
6e23ae2a PM	36	[NF_INET_LOCAL_IN] = 0,
	37	[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
	38	[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
3c2ad469 PM	39	},
3c2ad469 PM	40	.underflow = {
6e23ae2a PM	41	[NF_INET_LOCAL_IN] = 0,
	42	[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
	43	[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
3c2ad469 PM	44	},
	45	},
	46	.entries = {
	47	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
	48	IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
	49	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
	50	},
	51	.term = IP6T_ERROR_INIT, /* ERROR */
1da177e4 LT	52	};
1da177e4 LT	53
35aad0ff	54	static const struct xt_table packet_filter = {
1da177e4 LT	55	.name = "filter",
1da177e4 LT	56	.valid_hooks = FILTER_VALID_HOOKS,
1da177e4	57	.me = THIS_MODULE,
f88e6a8a	58	.af = NFPROTO_IPV6,
2b95efe7	59	.priority = NF_IP6_PRI_FILTER,
1da177e4 LT	60	};
	61
	62	/* The work comes in here from netfilter.c. */
	63	static unsigned int
737535c5 JE	64	ip6table_filter_hook(unsigned int hook, struct sk_buff *skb,
	65	const struct net_device in, const struct net_device out,
	66	int (okfn)(struct sk_buff ))
43de9dfe	67	{
2b21e051	68	const struct net *net = dev_net((in != NULL) ? in : out);
1da177e4	69
2b21e051	70	return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_filter);
1da177e4 LT	71	}
1da177e4 LT	72
2b95efe7	73	static struct nf_hook_ops *filter_ops __read_mostly;
1da177e4 LT	74
	75	/* Default to forward because I got too much mail already. */
	76	static int forward = NF_ACCEPT;
	77	module_param(forward, bool, 0000);
	78
8280aa61 AD	79	static int __net_init ip6table_filter_net_init(struct net *net)
	80	{
	81	/* Register table */
	82	net->ipv6.ip6table_filter =
	83	ip6t_register_table(net, &packet_filter, &initial_table.repl);
	84	if (IS_ERR(net->ipv6.ip6table_filter))
	85	return PTR_ERR(net->ipv6.ip6table_filter);
	86	return 0;
	87	}
	88
	89	static void __net_exit ip6table_filter_net_exit(struct net *net)
	90	{
f54e9367	91	ip6t_unregister_table(net, net->ipv6.ip6table_filter);
8280aa61 AD	92	}
	93
	94	static struct pernet_operations ip6table_filter_net_ops = {
	95	.init = ip6table_filter_net_init,
	96	.exit = ip6table_filter_net_exit,
	97	};
	98
65b4b4e8	99	static int __init ip6table_filter_init(void)
1da177e4 LT	100	{
	101	int ret;
	102
	103	if (forward < 0 \|\| forward > NF_MAX_VERDICT) {
	104	printk("iptables forward must be 0 or 1\n");
	105	return -EINVAL;
	106	}
	107
	108	/* Entry 1 is the FORWARD hook */
	109	initial_table.entries[1].target.verdict = -forward - 1;
	110
8280aa61 AD	111	ret = register_pernet_subsys(&ip6table_filter_net_ops);
	112	if (ret < 0)
	113	return ret;
1da177e4 LT	114
1da177e4 LT	115	/* Register hooks */
2b95efe7 JE	116	filter_ops = xt_hook_link(&packet_filter, ip6table_filter_hook);
	117	if (IS_ERR(filter_ops)) {
	118	ret = PTR_ERR(filter_ops);
1da177e4	119	goto cleanup_table;
2b95efe7	120	}
1da177e4	121
1da177e4 LT	122	return ret;
1da177e4 LT	123
1da177e4	124	cleanup_table:
8280aa61	125	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	126	return ret;
	127	}
	128
65b4b4e8	129	static void __exit ip6table_filter_fini(void)
1da177e4	130	{
2b95efe7	131	xt_hook_unlink(&packet_filter, filter_ops);
8280aa61	132	unregister_pernet_subsys(&ip6table_filter_net_ops);
1da177e4 LT	133	}
1da177e4 LT	134
65b4b4e8 AM	135	module_init(ip6table_filter_init);
65b4b4e8 AM	136	module_exit(ip6table_filter_fini);