/* *  ebt_snat * *	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_snat(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;	if (skb_shared(*pskb) || skb_cloned(*pskb)) {		struct sk_buff *nskb;		nskb = skb_copy(*pskb, GFP_ATOMIC);		if (!nskb)			return NF_DROP;		if ((*pskb)->sk)			skb_set_owner_w(nskb, (*pskb)->sk);		kfree_skb(*pskb);		*pskb = nskb;	}	memcpy(((**pskb).mac.ethernet)->h_source, info->mac,	   ETH_ALEN * sizeof(unsigned char));	return info->target;}static int ebt_target_snat_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 (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))		return -EINVAL;	if (BASE_CHAIN && info->target == EBT_RETURN)		return -EINVAL;	CLEAR_BASE_CHAIN_BIT;	if (strcmp(tablename, "nat"))		return -EINVAL;	if (hookmask & ~(1 << NF_BR_POST_ROUTING))		return -EINVAL;	if (INVALID_TARGET)		return -EINVAL;	return 0;}static struct ebt_target snat ={	.name		= EBT_SNAT_TARGET,	.target		= ebt_target_snat,	.check		= ebt_target_snat_check,	.me		= THIS_MODULE,};static int __init init(void){	return ebt_register_target(&snat);}static void __exit fini(void){	ebt_unregister_target(&snat);}module_init(init);module_exit(fini);MODULE_LICENSE("GPL");