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/*
* ebtable_broute
*
* Authors:
* Bart De Schuymer <bdschuym@pandora.be>
*
* April, 2002
*
* This table lets you choose between routing and bridging for frames
* entering on a bridge enslaved nic. This table is traversed before any
* other ebtables table. See net/bridge/br_input.c.
*/
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/module.h>
#include <linux/if_bridge.h>
#include <linux/brlock.h>
/* EBT_ACCEPT means the frame will be bridged
* EBT_DROP means the frame will be routed
*/
static struct ebt_entries initial_chain = {
.name = "BROUTING",
.policy = EBT_ACCEPT,
};
static struct ebt_replace initial_table =
{
.name = "broute",
.valid_hooks = 1 << NF_BR_BROUTING,
.entries_size = sizeof(struct ebt_entries),
.hook_entry = {
[NF_BR_BROUTING] = &initial_chain
},
.entries = (char *)&initial_chain
};
static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
{
if (valid_hooks & ~(1 << NF_BR_BROUTING))
return -EINVAL;
return 0;
}
static struct ebt_table broute_table =
{
.name = "broute",
.table = &initial_table,
.valid_hooks = 1 << NF_BR_BROUTING,
.lock = RW_LOCK_UNLOCKED,
.check = check,
};
static int ebt_broute(struct sk_buff **pskb)
{
int ret;
ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
&broute_table);
if (ret == NF_DROP)
return 1; /* route it */
return 0; /* bridge it */
}
static int __init init(void)
{
int ret;
ret = ebt_register_table(&broute_table);
if (ret < 0)
return ret;
br_write_lock_bh(BR_NETPROTO_LOCK);
/* see br_input.c */
br_should_route_hook = ebt_broute;
br_write_unlock_bh(BR_NETPROTO_LOCK);
return ret;
}
static void __exit fini(void)
{
br_write_lock_bh(BR_NETPROTO_LOCK);
br_should_route_hook = NULL;
br_write_unlock_bh(BR_NETPROTO_LOCK);
ebt_unregister_table(&broute_table);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
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