[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_IP6_LOCAL_IN) | (1 << NF_IP6_FORWARD) | (1 << NF_IP6_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_IP6_LOCAL_IN] = 0,
			[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
			[NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
		},
		.underflow = {
			[NF_IP6_LOCAL_IN] = 0,
			[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
			[NF_IP6_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_IP6_LOCAL_IN,
		.priority	= NF_IP6_PRI_FILTER,
	},
	{
		.hook		= ip6t_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_INET6,
		.hooknum	= NF_IP6_FORWARD,
		.priority	= NF_IP6_PRI_FILTER,
	},
	{
		.hook		= ip6t_local_out_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_INET6,
		.hooknum	= NF_IP6_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
	20	#define FILTER_VALID_HOOKS ((1 << NF_IP6_LOCAL_IN) \| (1 << NF_IP6_FORWARD) \| (1 << NF_IP6_LOCAL_OUT))
	21
1da177e4 LT	22	static struct
	23	{
	24	struct ip6t_replace repl;
	25	struct ip6t_standard entries[3];
	26	struct ip6t_error term;
3c2ad469 PM	27	} initial_table __initdata = {
	28	.repl = {
	29	.name = "filter",
	30	.valid_hooks = FILTER_VALID_HOOKS,
	31	.num_entries = 4,
	32	.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
	33	.hook_entry = {
	34	[NF_IP6_LOCAL_IN] = 0,
	35	[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
	36	[NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
	37	},
	38	.underflow = {
	39	[NF_IP6_LOCAL_IN] = 0,
	40	[NF_IP6_FORWARD] = sizeof(struct ip6t_standard),
	41	[NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
	42	},
	43	},
	44	.entries = {
	45	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
	46	IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
	47	IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
	48	},
	49	.term = IP6T_ERROR_INIT, /* ERROR */
1da177e4 LT	50	};
1da177e4 LT	51
e60a13e0	52	static struct xt_table packet_filter = {
1da177e4 LT	53	.name = "filter",
	54	.valid_hooks = FILTER_VALID_HOOKS,
	55	.lock = RW_LOCK_UNLOCKED,
	56	.me = THIS_MODULE,
2e4e6a17	57	.af = AF_INET6,
1da177e4 LT	58	};
	59
	60	/* The work comes in here from netfilter.c. */
	61	static unsigned int
	62	ip6t_hook(unsigned int hook,
3db05fea	63	struct sk_buff *skb,
1da177e4 LT	64	const struct net_device *in,
	65	const struct net_device *out,
	66	int (okfn)(struct sk_buff ))
	67	{
3db05fea	68	return ip6t_do_table(skb, hook, in, out, &packet_filter);
1da177e4 LT	69	}
	70
	71	static unsigned int
	72	ip6t_local_out_hook(unsigned int hook,
3db05fea	73	struct sk_buff *skb,
1da177e4 LT	74	const struct net_device *in,
	75	const struct net_device *out,
	76	int (okfn)(struct sk_buff ))
	77	{
	78	#if 0
	79	/* root is playing with raw sockets. */
3db05fea HX	80	if (skb->len < sizeof(struct iphdr)
3db05fea HX	81	\|\| ip_hdrlen(skb) < sizeof(struct iphdr)) {
1da177e4 LT	82	if (net_ratelimit())
	83	printk("ip6t_hook: happy cracking.\n");
	84	return NF_ACCEPT;
	85	}
	86	#endif
	87
3db05fea	88	return ip6t_do_table(skb, hook, in, out, &packet_filter);
1da177e4 LT	89	}
	90
	91	static struct nf_hook_ops ip6t_ops[] = {
	92	{
	93	.hook = ip6t_hook,
	94	.owner = THIS_MODULE,
	95	.pf = PF_INET6,
	96	.hooknum = NF_IP6_LOCAL_IN,
	97	.priority = NF_IP6_PRI_FILTER,
	98	},
	99	{
	100	.hook = ip6t_hook,
	101	.owner = THIS_MODULE,
	102	.pf = PF_INET6,
	103	.hooknum = NF_IP6_FORWARD,
	104	.priority = NF_IP6_PRI_FILTER,
	105	},
	106	{
	107	.hook = ip6t_local_out_hook,
	108	.owner = THIS_MODULE,
	109	.pf = PF_INET6,
	110	.hooknum = NF_IP6_LOCAL_OUT,
	111	.priority = NF_IP6_PRI_FILTER,
	112	},
	113	};
	114
	115	/* Default to forward because I got too much mail already. */
	116	static int forward = NF_ACCEPT;
	117	module_param(forward, bool, 0000);
	118
65b4b4e8	119	static int __init ip6table_filter_init(void)
1da177e4 LT	120	{
	121	int ret;
	122
	123	if (forward < 0 \|\| forward > NF_MAX_VERDICT) {
	124	printk("iptables forward must be 0 or 1\n");
	125	return -EINVAL;
	126	}
	127
	128	/* Entry 1 is the FORWARD hook */
	129	initial_table.entries[1].target.verdict = -forward - 1;
	130
	131	/* Register table */
	132	ret = ip6t_register_table(&packet_filter, &initial_table.repl);
	133	if (ret < 0)
	134	return ret;
	135
	136	/* Register hooks */
964ddaa1	137	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
1da177e4 LT	138	if (ret < 0)
	139	goto cleanup_table;
	140
1da177e4 LT	141	return ret;
1da177e4 LT	142
1da177e4 LT	143	cleanup_table:
1da177e4 LT	144	ip6t_unregister_table(&packet_filter);
1da177e4 LT	145	return ret;
	146	}
	147
65b4b4e8	148	static void __exit ip6table_filter_fini(void)
1da177e4	149	{
964ddaa1	150	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
1da177e4 LT	151	ip6t_unregister_table(&packet_filter);
	152	}
	153
65b4b4e8 AM	154	module_init(ip6table_filter_init);
65b4b4e8 AM	155	module_exit(ip6table_filter_fini);