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

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

#include <linux/netfilter.h>
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_nat.h>
#include <linux/module.h>
#include <net/sock.h>

static int ebt_target_dnat(struct sk_buff *skb, unsigned int hooknr,
   const struct net_device *in, const struct net_device *out,
   const void *data, unsigned int datalen)
{
	struct ebt_nat_info *info = (struct ebt_nat_info *)data;

	if (skb_make_writable(skb, 0))
		return NF_DROP;

	memcpy(eth_hdr(skb)->h_dest, info->mac, ETH_ALEN);
	return info->target;
}

static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
   const struct ebt_entry *e, void *data, unsigned int datalen)
{
	struct ebt_nat_info *info = (struct ebt_nat_info *)data;

	if (BASE_CHAIN && info->target == EBT_RETURN)
		return -EINVAL;
	CLEAR_BASE_CHAIN_BIT;
	if ( (strcmp(tablename, "nat") ||
	   (hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
	   (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
		return -EINVAL;
	if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
		return -EINVAL;
	if (INVALID_TARGET)
		return -EINVAL;
	return 0;
}

static struct ebt_target dnat =
{
	.name		= EBT_DNAT_TARGET,
	.target		= ebt_target_dnat,
	.check		= ebt_target_dnat_check,
	.me		= THIS_MODULE,
};

static int __init ebt_dnat_init(void)
{
	return ebt_register_target(&dnat);
}

static void __exit ebt_dnat_fini(void)
{
	ebt_unregister_target(&dnat);
}

module_init(ebt_dnat_init);
module_exit(ebt_dnat_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ebt_dnat
	3	*
	4	* Authors:
	5	* Bart De Schuymer <bdschuym@pandora.be>
	6	*
	7	* June, 2002
	8	*
	9	*/
	10
2ca7b0ac	11	#include <linux/netfilter.h>
1da177e4 LT	12	#include <linux/netfilter_bridge/ebtables.h>
	13	#include <linux/netfilter_bridge/ebt_nat.h>
	14	#include <linux/module.h>
	15	#include <net/sock.h>
	16
3db05fea	17	static int ebt_target_dnat(struct sk_buff *skb, unsigned int hooknr,
1da177e4 LT	18	const struct net_device in, const struct net_device out,
	19	const void *data, unsigned int datalen)
	20	{
	21	struct ebt_nat_info info = (struct ebt_nat_info )data;
	22
3db05fea	23	if (skb_make_writable(skb, 0))
2ca7b0ac	24	return NF_DROP;
1da177e4	25
3db05fea	26	memcpy(eth_hdr(skb)->h_dest, info->mac, ETH_ALEN);
1da177e4 LT	27	return info->target;
	28	}
	29
	30	static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
	31	const struct ebt_entry e, void data, unsigned int datalen)
	32	{
	33	struct ebt_nat_info info = (struct ebt_nat_info )data;
	34
	35	if (BASE_CHAIN && info->target == EBT_RETURN)
	36	return -EINVAL;
	37	CLEAR_BASE_CHAIN_BIT;
	38	if ( (strcmp(tablename, "nat") \|\|
	39	(hookmask & ~((1 << NF_BR_PRE_ROUTING) \| (1 << NF_BR_LOCAL_OUT)))) &&
	40	(strcmp(tablename, "broute") \|\| hookmask & ~(1 << NF_BR_BROUTING)) )
	41	return -EINVAL;
	42	if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
	43	return -EINVAL;
	44	if (INVALID_TARGET)
	45	return -EINVAL;
	46	return 0;
	47	}
	48
	49	static struct ebt_target dnat =
	50	{
	51	.name = EBT_DNAT_TARGET,
	52	.target = ebt_target_dnat,
	53	.check = ebt_target_dnat_check,
	54	.me = THIS_MODULE,
	55	};
	56
65b4b4e8	57	static int __init ebt_dnat_init(void)
1da177e4 LT	58	{
	59	return ebt_register_target(&dnat);
	60	}
	61
65b4b4e8	62	static void __exit ebt_dnat_fini(void)
1da177e4 LT	63	{
	64	ebt_unregister_target(&dnat);
	65	}
	66
65b4b4e8 AM	67	module_init(ebt_dnat_init);
65b4b4e8 AM	68	module_exit(ebt_dnat_fini);
1da177e4	69	MODULE_LICENSE("GPL");