blob: ffc986a2fa985f5080d892e3f6113ed5cb8f6702 [file] [log] [blame]
/*
* ebt_dnat
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* June, 2002
*
*/
#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 **pskb, 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;
memcpy(((**pskb).mac.ethernet)->h_dest, info->mac,
ETH_ALEN * sizeof(unsigned char));
return info->target;
}
static struct ebt_target dnat;
static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen,
unsigned int version)
{
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 != sizeof(struct ebt_nat_info))
return -EINVAL;
if (ebt_check_version(version, dnat.version, dnat.name))
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,
.version = VERSIONIZE(1,0),
};
static int __init init(void)
{
return ebt_register_target(&dnat);
}
static void __exit fini(void)
{
ebt_unregister_target(&dnat);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");