[net-next-2.6.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,
};

/* 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[] = {
	{
		.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 */
	ret = ip6t_register_table(&packet_filter, &initial_table.repl);
	if (ret < 0)
		return ret;

	/* 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
e60a13e0	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 LT	60	};
	61
	62	/* The work comes in here from netfilter.c. */
	63	static unsigned int
	64	ip6t_hook(unsigned int hook,
3db05fea	65	struct sk_buff *skb,
1da177e4 LT	66	const struct net_device *in,
	67	const struct net_device *out,
	68	int (okfn)(struct sk_buff ))
	69	{
3db05fea	70	return ip6t_do_table(skb, hook, in, out, &packet_filter);
1da177e4 LT	71	}
	72
	73	static unsigned int
	74	ip6t_local_out_hook(unsigned int hook,
3db05fea	75	struct sk_buff *skb,
1da177e4 LT	76	const struct net_device *in,
	77	const struct net_device *out,
	78	int (okfn)(struct sk_buff ))
	79	{
	80	#if 0
	81	/* root is playing with raw sockets. */
3db05fea HX	82	if (skb->len < sizeof(struct iphdr)
3db05fea HX	83	\|\| ip_hdrlen(skb) < sizeof(struct iphdr)) {
1da177e4 LT	84	if (net_ratelimit())
	85	printk("ip6t_hook: happy cracking.\n");
	86	return NF_ACCEPT;
	87	}
	88	#endif
	89
3db05fea	90	return ip6t_do_table(skb, hook, in, out, &packet_filter);
1da177e4 LT	91	}
	92
	93	static struct nf_hook_ops ip6t_ops[] = {
	94	{
	95	.hook = ip6t_hook,
	96	.owner = THIS_MODULE,
	97	.pf = PF_INET6,
6e23ae2a	98	.hooknum = NF_INET_LOCAL_IN,
1da177e4 LT	99	.priority = NF_IP6_PRI_FILTER,
	100	},
	101	{
	102	.hook = ip6t_hook,
	103	.owner = THIS_MODULE,
	104	.pf = PF_INET6,
6e23ae2a	105	.hooknum = NF_INET_FORWARD,
1da177e4 LT	106	.priority = NF_IP6_PRI_FILTER,
	107	},
	108	{
	109	.hook = ip6t_local_out_hook,
	110	.owner = THIS_MODULE,
	111	.pf = PF_INET6,
6e23ae2a	112	.hooknum = NF_INET_LOCAL_OUT,
1da177e4 LT	113	.priority = NF_IP6_PRI_FILTER,
	114	},
	115	};
	116
	117	/* Default to forward because I got too much mail already. */
	118	static int forward = NF_ACCEPT;
	119	module_param(forward, bool, 0000);
	120
65b4b4e8	121	static int __init ip6table_filter_init(void)
1da177e4 LT	122	{
	123	int ret;
	124
	125	if (forward < 0 \|\| forward > NF_MAX_VERDICT) {
	126	printk("iptables forward must be 0 or 1\n");
	127	return -EINVAL;
	128	}
	129
	130	/* Entry 1 is the FORWARD hook */
	131	initial_table.entries[1].target.verdict = -forward - 1;
	132
	133	/* Register table */
	134	ret = ip6t_register_table(&packet_filter, &initial_table.repl);
	135	if (ret < 0)
	136	return ret;
	137
	138	/* Register hooks */
964ddaa1	139	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
1da177e4 LT	140	if (ret < 0)
	141	goto cleanup_table;
	142
1da177e4 LT	143	return ret;
1da177e4 LT	144
1da177e4 LT	145	cleanup_table:
1da177e4 LT	146	ip6t_unregister_table(&packet_filter);
1da177e4 LT	147	return ret;
	148	}
	149
65b4b4e8	150	static void __exit ip6table_filter_fini(void)
1da177e4	151	{
964ddaa1	152	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
1da177e4 LT	153	ip6t_unregister_table(&packet_filter);
	154	}
	155
65b4b4e8 AM	156	module_init(ip6table_filter_init);
65b4b4e8 AM	157	module_exit(ip6table_filter_fini);