[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 __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 struct xt_table __packet_filter = {
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.lock		= RW_LOCK_UNLOCKED,
	.me		= THIS_MODULE,
	.af		= AF_INET6,
};
static struct xt_table *packet_filter;

/* The work comes in here from netfilter.c. */
static unsigned int
ip6t_hook(unsigned int hook,
	 struct sk_buff *skb,
	 const struct net_device *in,
	 const struct net_device *out,
	 int (*okfn)(struct sk_buff *))
{
	return ip6t_do_table(skb, hook, in, out, packet_filter);
}

static unsigned int
ip6t_local_out_hook(unsigned int hook,
		   struct sk_buff *skb,
		   const struct net_device *in,
		   const struct net_device *out,
		   int (*okfn)(struct sk_buff *))
{
#if 0
	/* root is playing with raw sockets. */
	if (skb->len < sizeof(struct iphdr)
	    || ip_hdrlen(skb) < sizeof(struct iphdr)) {
		if (net_ratelimit())
			printk("ip6t_hook: happy cracking.\n");
		return NF_ACCEPT;
	}
#endif

	return ip6t_do_table(skb, hook, in, out, packet_filter);
}

static struct nf_hook_ops ip6t_ops[] __read_mostly = {
	{
		.hook		= ip6t_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_INET6,
		.hooknum	= NF_INET_LOCAL_IN,
		.priority	= NF_IP6_PRI_FILTER,
	},
	{
		.hook		= ip6t_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_INET6,
		.hooknum	= NF_INET_FORWARD,
		.priority	= NF_IP6_PRI_FILTER,
	},
	{
		.hook		= ip6t_local_out_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_INET6,
		.hooknum	= NF_INET_LOCAL_OUT,
		.priority	= NF_IP6_PRI_FILTER,
	},
};

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

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;

	/* Register table */
	packet_filter = ip6t_register_table(&init_net, &__packet_filter, &initial_table.repl);
	if (IS_ERR(packet_filter))
		return PTR_ERR(packet_filter);

	/* Register hooks */
	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	if (ret < 0)
		goto cleanup_table;

	return ret;

 cleanup_table:
	ip6t_unregister_table(packet_filter);
	return ret;
}

static void __exit ip6table_filter_fini(void)
{
	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
	ip6t_unregister_table(packet_filter);
}

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;
3c2ad469 PM	29	} initial_table __initdata = {
	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
44d34e72	54	static struct xt_table __packet_filter = {
1da177e4 LT	55	.name = "filter",
	56	.valid_hooks = FILTER_VALID_HOOKS,
	57	.lock = RW_LOCK_UNLOCKED,
	58	.me = THIS_MODULE,
2e4e6a17	59	.af = AF_INET6,
1da177e4	60	};
44d34e72	61	static struct xt_table *packet_filter;
1da177e4 LT	62
	63	/* The work comes in here from netfilter.c. */
	64	static unsigned int
	65	ip6t_hook(unsigned int hook,
3db05fea	66	struct sk_buff *skb,
1da177e4 LT	67	const struct net_device *in,
	68	const struct net_device *out,
	69	int (okfn)(struct sk_buff ))
	70	{
44d34e72	71	return ip6t_do_table(skb, hook, in, out, packet_filter);
1da177e4 LT	72	}
	73
	74	static unsigned int
	75	ip6t_local_out_hook(unsigned int hook,
3db05fea	76	struct sk_buff *skb,
1da177e4 LT	77	const struct net_device *in,
	78	const struct net_device *out,
	79	int (okfn)(struct sk_buff ))
	80	{
	81	#if 0
	82	/* root is playing with raw sockets. */
3db05fea HX	83	if (skb->len < sizeof(struct iphdr)
3db05fea HX	84	\|\| ip_hdrlen(skb) < sizeof(struct iphdr)) {
1da177e4 LT	85	if (net_ratelimit())
	86	printk("ip6t_hook: happy cracking.\n");
	87	return NF_ACCEPT;
	88	}
	89	#endif
	90
44d34e72	91	return ip6t_do_table(skb, hook, in, out, packet_filter);
1da177e4 LT	92	}
1da177e4 LT	93
1999414a	94	static struct nf_hook_ops ip6t_ops[] __read_mostly = {
1da177e4 LT	95	{
	96	.hook = ip6t_hook,
	97	.owner = THIS_MODULE,
	98	.pf = PF_INET6,
6e23ae2a	99	.hooknum = NF_INET_LOCAL_IN,
1da177e4 LT	100	.priority = NF_IP6_PRI_FILTER,
	101	},
	102	{
	103	.hook = ip6t_hook,
	104	.owner = THIS_MODULE,
	105	.pf = PF_INET6,
6e23ae2a	106	.hooknum = NF_INET_FORWARD,
1da177e4 LT	107	.priority = NF_IP6_PRI_FILTER,
	108	},
	109	{
	110	.hook = ip6t_local_out_hook,
	111	.owner = THIS_MODULE,
	112	.pf = PF_INET6,
6e23ae2a	113	.hooknum = NF_INET_LOCAL_OUT,
1da177e4 LT	114	.priority = NF_IP6_PRI_FILTER,
	115	},
	116	};
	117
	118	/* Default to forward because I got too much mail already. */
	119	static int forward = NF_ACCEPT;
	120	module_param(forward, bool, 0000);
	121
65b4b4e8	122	static int __init ip6table_filter_init(void)
1da177e4 LT	123	{
	124	int ret;
	125
	126	if (forward < 0 \|\| forward > NF_MAX_VERDICT) {
	127	printk("iptables forward must be 0 or 1\n");
	128	return -EINVAL;
	129	}
	130
	131	/* Entry 1 is the FORWARD hook */
	132	initial_table.entries[1].target.verdict = -forward - 1;
	133
	134	/* Register table */
336b517f	135	packet_filter = ip6t_register_table(&init_net, &__packet_filter, &initial_table.repl);
44d34e72 AD	136	if (IS_ERR(packet_filter))
44d34e72 AD	137	return PTR_ERR(packet_filter);
1da177e4 LT	138
1da177e4 LT	139	/* Register hooks */
964ddaa1	140	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
1da177e4 LT	141	if (ret < 0)
	142	goto cleanup_table;
	143
1da177e4 LT	144	return ret;
1da177e4 LT	145
1da177e4	146	cleanup_table:
44d34e72	147	ip6t_unregister_table(packet_filter);
1da177e4 LT	148	return ret;
	149	}
	150
65b4b4e8	151	static void __exit ip6table_filter_fini(void)
1da177e4	152	{
964ddaa1	153	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
44d34e72	154	ip6t_unregister_table(packet_filter);
1da177e4 LT	155	}
1da177e4 LT	156
65b4b4e8 AM	157	module_init(ip6table_filter_init);
65b4b4e8 AM	158	module_exit(ip6table_filter_fini);