2005-04-16 22:20:36 +00:00
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/*
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* ebt_dnat
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*
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* Authors:
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* Bart De Schuymer <bdschuym@pandora.be>
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*
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* June, 2002
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*
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*/
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2008-10-08 09:35:13 +00:00
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#include <linux/module.h>
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#include <net/sock.h>
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2007-10-14 07:39:55 +00:00
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#include <linux/netfilter.h>
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2008-10-08 09:35:13 +00:00
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#include <linux/netfilter/x_tables.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/netfilter_bridge/ebtables.h>
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#include <linux/netfilter_bridge/ebt_nat.h>
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2008-10-08 09:35:13 +00:00
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static unsigned int ebt_target_dnat(struct sk_buff *skb, unsigned int hooknr,
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2005-04-16 22:20:36 +00:00
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const struct net_device *in, const struct net_device *out,
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const void *data, unsigned int datalen)
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{
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2008-01-31 11:59:24 +00:00
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const struct ebt_nat_info *info = data;
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2005-04-16 22:20:36 +00:00
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2008-02-20 01:18:47 +00:00
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if (!skb_make_writable(skb, 0))
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2008-02-24 04:22:27 +00:00
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return EBT_DROP;
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2005-04-16 22:20:36 +00:00
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2007-10-15 07:53:15 +00:00
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memcpy(eth_hdr(skb)->h_dest, info->mac, ETH_ALEN);
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2005-04-16 22:20:36 +00:00
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return info->target;
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}
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2008-10-08 09:35:13 +00:00
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static bool ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
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2005-04-16 22:20:36 +00:00
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const struct ebt_entry *e, void *data, unsigned int datalen)
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{
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2008-01-31 11:59:24 +00:00
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const struct ebt_nat_info *info = data;
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2005-04-16 22:20:36 +00:00
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if (BASE_CHAIN && info->target == EBT_RETURN)
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2008-10-08 09:35:13 +00:00
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return false;
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2005-04-16 22:20:36 +00:00
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CLEAR_BASE_CHAIN_BIT;
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if ( (strcmp(tablename, "nat") ||
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(hookmask & ~((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT)))) &&
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(strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
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2008-10-08 09:35:13 +00:00
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return false;
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2005-04-16 22:20:36 +00:00
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if (INVALID_TARGET)
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2008-10-08 09:35:13 +00:00
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return false;
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return true;
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2005-04-16 22:20:36 +00:00
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}
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2008-01-31 12:00:59 +00:00
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static struct ebt_target dnat __read_mostly = {
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2005-04-16 22:20:36 +00:00
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.name = EBT_DNAT_TARGET,
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2008-10-08 09:35:14 +00:00
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.revision = 0,
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.family = NFPROTO_BRIDGE,
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2005-04-16 22:20:36 +00:00
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.target = ebt_target_dnat,
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.check = ebt_target_dnat_check,
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2008-10-08 09:35:13 +00:00
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.targetsize = XT_ALIGN(sizeof(struct ebt_nat_info)),
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2005-04-16 22:20:36 +00:00
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.me = THIS_MODULE,
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};
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2006-03-29 00:37:06 +00:00
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static int __init ebt_dnat_init(void)
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2005-04-16 22:20:36 +00:00
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{
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return ebt_register_target(&dnat);
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}
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2006-03-29 00:37:06 +00:00
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static void __exit ebt_dnat_fini(void)
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2005-04-16 22:20:36 +00:00
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{
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ebt_unregister_target(&dnat);
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}
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2006-03-29 00:37:06 +00:00
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module_init(ebt_dnat_init);
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module_exit(ebt_dnat_fini);
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2008-01-31 12:00:30 +00:00
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MODULE_DESCRIPTION("Ebtables: Destination MAC address translation");
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2005-04-16 22:20:36 +00:00
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MODULE_LICENSE("GPL");
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