[linux-2.6-block.git] / net / bridge / netfilter / ebtable_nat.c

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

#include <linux/netfilter_bridge/ebtables.h>
#include <linux/module.h>

#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
   (1 << NF_BR_POST_ROUTING))

static struct ebt_entries initial_chains[] = {
	{
		.name	= "PREROUTING",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "OUTPUT",
		.policy	= EBT_ACCEPT,
	},
	{
		.name	= "POSTROUTING",
		.policy	= EBT_ACCEPT,
	}
};

static struct ebt_replace_kernel initial_table = {
	.name		= "nat",
	.valid_hooks	= NAT_VALID_HOOKS,
	.entries_size	= 3 * sizeof(struct ebt_entries),
	.hook_entry	= {
		[NF_BR_PRE_ROUTING]	= &initial_chains[0],
		[NF_BR_LOCAL_OUT]	= &initial_chains[1],
		[NF_BR_POST_ROUTING]	= &initial_chains[2],
	},
	.entries	= (char *)initial_chains,
};

static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
{
	if (valid_hooks & ~NAT_VALID_HOOKS)
		return -EINVAL;
	return 0;
}

static struct ebt_table frame_nat = {
	.name		= "nat",
	.table		= &initial_table,
	.valid_hooks	= NAT_VALID_HOOKS,
	.check		= check,
	.me		= THIS_MODULE,
};

static unsigned int
ebt_nat_in(const struct nf_hook_ops *ops, struct sk_buff *skb,
	   const struct net_device *in, const struct net_device *out,
	   int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(ops->hooknum, skb, in, out,
			    dev_net(in)->xt.frame_nat);
}

static unsigned int
ebt_nat_out(const struct nf_hook_ops *ops, struct sk_buff *skb,
	    const struct net_device *in, const struct net_device *out,
	    int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(ops->hooknum, skb, in, out,
			    dev_net(out)->xt.frame_nat);
}

static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
	{
		.hook		= ebt_nat_out,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_LOCAL_OUT,
		.priority	= NF_BR_PRI_NAT_DST_OTHER,
	},
	{
		.hook		= ebt_nat_out,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_POST_ROUTING,
		.priority	= NF_BR_PRI_NAT_SRC,
	},
	{
		.hook		= ebt_nat_in,
		.owner		= THIS_MODULE,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_PRE_ROUTING,
		.priority	= NF_BR_PRI_NAT_DST_BRIDGED,
	},
};

static int __net_init frame_nat_net_init(struct net *net)
{
	net->xt.frame_nat = ebt_register_table(net, &frame_nat);
	return PTR_ERR_OR_ZERO(net->xt.frame_nat);
}

static void __net_exit frame_nat_net_exit(struct net *net)
{
	ebt_unregister_table(net, net->xt.frame_nat);
}

static struct pernet_operations frame_nat_net_ops = {
	.init = frame_nat_net_init,
	.exit = frame_nat_net_exit,
};

static int __init ebtable_nat_init(void)
{
	int ret;

	ret = register_pernet_subsys(&frame_nat_net_ops);
	if (ret < 0)
		return ret;
	ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
	if (ret < 0)
		unregister_pernet_subsys(&frame_nat_net_ops);
	return ret;
}

static void __exit ebtable_nat_fini(void)
{
	nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
	unregister_pernet_subsys(&frame_nat_net_ops);
}

module_init(ebtable_nat_init);
module_exit(ebtable_nat_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ebtable_nat
	3	*
	4	* Authors:
	5	* Bart De Schuymer <bdschuym@pandora.be>
	6	*
	7	* April, 2002
	8	*
	9	*/
	10
	11	#include <linux/netfilter_bridge/ebtables.h>
	12	#include <linux/module.h>
	13
	14	#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) \| (1 << NF_BR_LOCAL_OUT) \| \
	15	(1 << NF_BR_POST_ROUTING))
	16
97ad8b53	17	static struct ebt_entries initial_chains[] = {
1da177e4 LT	18	{
	19	.name = "PREROUTING",
	20	.policy = EBT_ACCEPT,
	21	},
	22	{
	23	.name = "OUTPUT",
	24	.policy = EBT_ACCEPT,
	25	},
	26	{
	27	.name = "POSTROUTING",
	28	.policy = EBT_ACCEPT,
	29	}
	30	};
	31
97ad8b53	32	static struct ebt_replace_kernel initial_table = {
1da177e4 LT	33	.name = "nat",
	34	.valid_hooks = NAT_VALID_HOOKS,
	35	.entries_size = 3 * sizeof(struct ebt_entries),
	36	.hook_entry = {
	37	[NF_BR_PRE_ROUTING] = &initial_chains[0],
	38	[NF_BR_LOCAL_OUT] = &initial_chains[1],
	39	[NF_BR_POST_ROUTING] = &initial_chains[2],
	40	},
	41	.entries = (char *)initial_chains,
	42	};
	43
	44	static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
	45	{
	46	if (valid_hooks & ~NAT_VALID_HOOKS)
	47	return -EINVAL;
	48	return 0;
	49	}
	50
97ad8b53	51	static struct ebt_table frame_nat = {
1da177e4 LT	52	.name = "nat",
	53	.table = &initial_table,
	54	.valid_hooks = NAT_VALID_HOOKS,
1da177e4 LT	55	.check = check,
	56	.me = THIS_MODULE,
	57	};
	58
	59	static unsigned int
795aa6ef PM	60	ebt_nat_in(const struct nf_hook_ops ops, struct sk_buff skb,
	61	const struct net_device in, const struct net_device out,
	62	int (okfn)(struct sk_buff ))
1da177e4	63	{
795aa6ef PM	64	return ebt_do_table(ops->hooknum, skb, in, out,
795aa6ef PM	65	dev_net(in)->xt.frame_nat);
1da177e4 LT	66	}
	67
	68	static unsigned int
795aa6ef PM	69	ebt_nat_out(const struct nf_hook_ops ops, struct sk_buff skb,
	70	const struct net_device in, const struct net_device out,
	71	int (okfn)(struct sk_buff ))
1da177e4	72	{
795aa6ef PM	73	return ebt_do_table(ops->hooknum, skb, in, out,
795aa6ef PM	74	dev_net(out)->xt.frame_nat);
1da177e4 LT	75	}
1da177e4 LT	76
1999414a	77	static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
1da177e4	78	{
b71b30a6	79	.hook = ebt_nat_out,
1da177e4	80	.owner = THIS_MODULE,
24c232d8	81	.pf = NFPROTO_BRIDGE,
1da177e4 LT	82	.hooknum = NF_BR_LOCAL_OUT,
	83	.priority = NF_BR_PRI_NAT_DST_OTHER,
	84	},
	85	{
b71b30a6	86	.hook = ebt_nat_out,
1da177e4	87	.owner = THIS_MODULE,
24c232d8	88	.pf = NFPROTO_BRIDGE,
1da177e4 LT	89	.hooknum = NF_BR_POST_ROUTING,
	90	.priority = NF_BR_PRI_NAT_SRC,
	91	},
	92	{
b71b30a6	93	.hook = ebt_nat_in,
1da177e4	94	.owner = THIS_MODULE,
24c232d8	95	.pf = NFPROTO_BRIDGE,
1da177e4 LT	96	.hooknum = NF_BR_PRE_ROUTING,
	97	.priority = NF_BR_PRI_NAT_DST_BRIDGED,
	98	},
	99	};
	100
b71b30a6 AD	101	static int __net_init frame_nat_net_init(struct net *net)
	102	{
	103	net->xt.frame_nat = ebt_register_table(net, &frame_nat);
8c6ffba0	104	return PTR_ERR_OR_ZERO(net->xt.frame_nat);
b71b30a6 AD	105	}
	106
	107	static void __net_exit frame_nat_net_exit(struct net *net)
	108	{
f54e9367	109	ebt_unregister_table(net, net->xt.frame_nat);
b71b30a6 AD	110	}
	111
	112	static struct pernet_operations frame_nat_net_ops = {
	113	.init = frame_nat_net_init,
	114	.exit = frame_nat_net_exit,
	115	};
	116
65b4b4e8	117	static int __init ebtable_nat_init(void)
1da177e4	118	{
e40f51a3	119	int ret;
1da177e4	120
b71b30a6 AD	121	ret = register_pernet_subsys(&frame_nat_net_ops);
	122	if (ret < 0)
	123	return ret;
e40f51a3 AD	124	ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
e40f51a3 AD	125	if (ret < 0)
b71b30a6	126	unregister_pernet_subsys(&frame_nat_net_ops);
1da177e4 LT	127	return ret;
	128	}
	129
65b4b4e8	130	static void __exit ebtable_nat_fini(void)
1da177e4	131	{
e40f51a3	132	nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
b71b30a6	133	unregister_pernet_subsys(&frame_nat_net_ops);
1da177e4 LT	134	}
1da177e4 LT	135
65b4b4e8 AM	136	module_init(ebtable_nat_init);
65b4b4e8 AM	137	module_exit(ebtable_nat_fini);
1da177e4	138	MODULE_LICENSE("GPL");