[net-next-2.6.git] / net / bridge / netfilter / ebtable_nat.c

/*
 *  ebtable_nat
 *
 *	Authors:
 *	Bart De Schuymer <bdschuym@pandora.be>
 *
 *  April, 2002
 *
 */

#include <linux/netfilter_bridge/ebtables.h>
#include <linux/module.h>

#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
   (1 << NF_BR_POST_ROUTING))

static struct ebt_entries initial_chains[] =
{
	{
		.name	= "PREROUTING",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "OUTPUT",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "POSTROUTING",
		.policy	= EBT_ACCEPT,
	}
};

static struct ebt_replace_kernel initial_table =
{
	.name		= "nat",
	.valid_hooks	= NAT_VALID_HOOKS,
	.entries_size	= 3 * sizeof(struct ebt_entries),
	.hook_entry	= {
		[NF_BR_PRE_ROUTING]	= &initial_chains[0],
		[NF_BR_LOCAL_OUT]	= &initial_chains[1],
		[NF_BR_POST_ROUTING]	= &initial_chains[2],
	},
	.entries	= (char *)initial_chains,
};

static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
{
	if (valid_hooks & ~NAT_VALID_HOOKS)
		return -EINVAL;
	return 0;
}

static struct ebt_table frame_nat =
{
	.name		= "nat",
	.table		= &initial_table,
	.valid_hooks	= NAT_VALID_HOOKS,
	.lock		= RW_LOCK_UNLOCKED,
	.check		= check,
	.me		= THIS_MODULE,
};

static unsigned int
ebt_nat_dst(unsigned int hook, struct sk_buff *skb, const struct net_device *in
   , const struct net_device *out, int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(hook, skb, in, out, &frame_nat);
}

static unsigned int
ebt_nat_src(unsigned int hook, struct sk_buff *skb, const struct net_device *in
   , const struct net_device *out, int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(hook, skb, in, out, &frame_nat);
}

static struct nf_hook_ops ebt_ops_nat[] = {
	{
		.hook		= ebt_nat_dst,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_LOCAL_OUT,
		.priority	= NF_BR_PRI_NAT_DST_OTHER,
	},
	{
		.hook		= ebt_nat_src,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_POST_ROUTING,
		.priority	= NF_BR_PRI_NAT_SRC,
	},
	{
		.hook		= ebt_nat_dst,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_PRE_ROUTING,
		.priority	= NF_BR_PRI_NAT_DST_BRIDGED,
	},
};

static int __init ebtable_nat_init(void)
{
	int i, ret, j;

	ret = ebt_register_table(&frame_nat);
	if (ret < 0)
		return ret;
	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
		if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
			goto cleanup;
	return ret;
cleanup:
	for (j = 0; j < i; j++)
		nf_unregister_hook(&ebt_ops_nat[j]);
	ebt_unregister_table(&frame_nat);
	return ret;
}

static void __exit ebtable_nat_fini(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
		nf_unregister_hook(&ebt_ops_nat[i]);
	ebt_unregister_table(&frame_nat);
}

module_init(ebtable_nat_init);
module_exit(ebtable_nat_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ebtable_nat
	3	*
	4	* Authors:
	5	* Bart De Schuymer <bdschuym@pandora.be>
	6	*
	7	* April, 2002
	8	*
	9	*/
	10
	11	#include <linux/netfilter_bridge/ebtables.h>
	12	#include <linux/module.h>
	13
	14	#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) \| (1 << NF_BR_LOCAL_OUT) \| \
	15	(1 << NF_BR_POST_ROUTING))
	16
	17	static struct ebt_entries initial_chains[] =
	18	{
	19	{
	20	.name = "PREROUTING",
	21	.policy = EBT_ACCEPT,
	22	},
	23	{
	24	.name = "OUTPUT",
	25	.policy = EBT_ACCEPT,
	26	},
	27	{
	28	.name = "POSTROUTING",
	29	.policy = EBT_ACCEPT,
	30	}
	31	};
	32
1e419cd9	33	static struct ebt_replace_kernel initial_table =
1da177e4 LT	34	{
	35	.name = "nat",
	36	.valid_hooks = NAT_VALID_HOOKS,
	37	.entries_size = 3 * sizeof(struct ebt_entries),
	38	.hook_entry = {
	39	[NF_BR_PRE_ROUTING] = &initial_chains[0],
	40	[NF_BR_LOCAL_OUT] = &initial_chains[1],
	41	[NF_BR_POST_ROUTING] = &initial_chains[2],
	42	},
	43	.entries = (char *)initial_chains,
	44	};
	45
	46	static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
	47	{
	48	if (valid_hooks & ~NAT_VALID_HOOKS)
	49	return -EINVAL;
	50	return 0;
	51	}
	52
	53	static struct ebt_table frame_nat =
	54	{
	55	.name = "nat",
	56	.table = &initial_table,
	57	.valid_hooks = NAT_VALID_HOOKS,
	58	.lock = RW_LOCK_UNLOCKED,
	59	.check = check,
	60	.me = THIS_MODULE,
	61	};
	62
	63	static unsigned int
3db05fea	64	ebt_nat_dst(unsigned int hook, struct sk_buff skb, const struct net_device in
1da177e4 LT	65	, const struct net_device out, int (okfn)(struct sk_buff *))
1da177e4 LT	66	{
3db05fea	67	return ebt_do_table(hook, skb, in, out, &frame_nat);
1da177e4 LT	68	}
	69
	70	static unsigned int
3db05fea	71	ebt_nat_src(unsigned int hook, struct sk_buff skb, const struct net_device in
1da177e4 LT	72	, const struct net_device out, int (okfn)(struct sk_buff *))
1da177e4 LT	73	{
3db05fea	74	return ebt_do_table(hook, skb, in, out, &frame_nat);
1da177e4 LT	75	}
	76
	77	static struct nf_hook_ops ebt_ops_nat[] = {
	78	{
	79	.hook = ebt_nat_dst,
	80	.owner = THIS_MODULE,
	81	.pf = PF_BRIDGE,
	82	.hooknum = NF_BR_LOCAL_OUT,
	83	.priority = NF_BR_PRI_NAT_DST_OTHER,
	84	},
	85	{
	86	.hook = ebt_nat_src,
	87	.owner = THIS_MODULE,
	88	.pf = PF_BRIDGE,
	89	.hooknum = NF_BR_POST_ROUTING,
	90	.priority = NF_BR_PRI_NAT_SRC,
	91	},
	92	{
	93	.hook = ebt_nat_dst,
	94	.owner = THIS_MODULE,
	95	.pf = PF_BRIDGE,
	96	.hooknum = NF_BR_PRE_ROUTING,
	97	.priority = NF_BR_PRI_NAT_DST_BRIDGED,
	98	},
	99	};
	100
65b4b4e8	101	static int __init ebtable_nat_init(void)
1da177e4 LT	102	{
	103	int i, ret, j;
	104
	105	ret = ebt_register_table(&frame_nat);
	106	if (ret < 0)
	107	return ret;
	108	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
	109	if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
	110	goto cleanup;
	111	return ret;
	112	cleanup:
	113	for (j = 0; j < i; j++)
	114	nf_unregister_hook(&ebt_ops_nat[j]);
	115	ebt_unregister_table(&frame_nat);
	116	return ret;
	117	}
	118
65b4b4e8	119	static void __exit ebtable_nat_fini(void)
1da177e4 LT	120	{
	121	int i;
	122
	123	for (i = 0; i < ARRAY_SIZE(ebt_ops_nat); i++)
	124	nf_unregister_hook(&ebt_ops_nat[i]);
	125	ebt_unregister_table(&frame_nat);
	126	}
	127
65b4b4e8 AM	128	module_init(ebtable_nat_init);
65b4b4e8 AM	129	module_exit(ebtable_nat_fini);
1da177e4	130	MODULE_LICENSE("GPL");