[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
	17	static struct ebt_entries initial_chains[] =
	18	{
	19	{
	20	.name = "PREROUTING",
	21	.policy = EBT_ACCEPT,
	22	},
	23	{
	24	.name = "OUTPUT",
	25	.policy = EBT_ACCEPT,
	26	},
	27	{
	28	.name = "POSTROUTING",
	29	.policy = EBT_ACCEPT,
	30	}
	31	};
	32
1e419cd9	33	static struct ebt_replace_kernel initial_table =
1da177e4 LT	34	{
	35	.name = "nat",
	36	.valid_hooks = NAT_VALID_HOOKS,
	37	.entries_size = 3 * sizeof(struct ebt_entries),
	38	.hook_entry = {
	39	[NF_BR_PRE_ROUTING] = &initial_chains[0],
	40	[NF_BR_LOCAL_OUT] = &initial_chains[1],
	41	[NF_BR_POST_ROUTING] = &initial_chains[2],
	42	},
	43	.entries = (char *)initial_chains,
	44	};
	45
	46	static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
	47	{
	48	if (valid_hooks & ~NAT_VALID_HOOKS)
	49	return -EINVAL;
	50	return 0;
	51	}
	52
b71b30a6	53	static struct ebt_table frame_nat =
1da177e4 LT	54	{
	55	.name = "nat",
	56	.table = &initial_table,
	57	.valid_hooks = NAT_VALID_HOOKS,
1da177e4 LT	58	.check = check,
	59	.me = THIS_MODULE,
	60	};
	61
	62	static unsigned int
795aa6ef PM	63	ebt_nat_in(const struct nf_hook_ops ops, struct sk_buff skb,
	64	const struct net_device in, const struct net_device out,
	65	int (okfn)(struct sk_buff ))
1da177e4	66	{
795aa6ef PM	67	return ebt_do_table(ops->hooknum, skb, in, out,
795aa6ef PM	68	dev_net(in)->xt.frame_nat);
1da177e4 LT	69	}
	70
	71	static unsigned int
795aa6ef PM	72	ebt_nat_out(const struct nf_hook_ops ops, struct sk_buff skb,
	73	const struct net_device in, const struct net_device out,
	74	int (okfn)(struct sk_buff ))
1da177e4	75	{
795aa6ef PM	76	return ebt_do_table(ops->hooknum, skb, in, out,
795aa6ef PM	77	dev_net(out)->xt.frame_nat);
1da177e4 LT	78	}
1da177e4 LT	79
1999414a	80	static struct nf_hook_ops ebt_ops_nat[] __read_mostly = {
1da177e4	81	{
b71b30a6	82	.hook = ebt_nat_out,
1da177e4	83	.owner = THIS_MODULE,
24c232d8	84	.pf = NFPROTO_BRIDGE,
1da177e4 LT	85	.hooknum = NF_BR_LOCAL_OUT,
	86	.priority = NF_BR_PRI_NAT_DST_OTHER,
	87	},
	88	{
b71b30a6	89	.hook = ebt_nat_out,
1da177e4	90	.owner = THIS_MODULE,
24c232d8	91	.pf = NFPROTO_BRIDGE,
1da177e4 LT	92	.hooknum = NF_BR_POST_ROUTING,
	93	.priority = NF_BR_PRI_NAT_SRC,
	94	},
	95	{
b71b30a6	96	.hook = ebt_nat_in,
1da177e4	97	.owner = THIS_MODULE,
24c232d8	98	.pf = NFPROTO_BRIDGE,
1da177e4 LT	99	.hooknum = NF_BR_PRE_ROUTING,
	100	.priority = NF_BR_PRI_NAT_DST_BRIDGED,
	101	},
	102	};
	103
b71b30a6 AD	104	static int __net_init frame_nat_net_init(struct net *net)
	105	{
	106	net->xt.frame_nat = ebt_register_table(net, &frame_nat);
8c6ffba0	107	return PTR_ERR_OR_ZERO(net->xt.frame_nat);
b71b30a6 AD	108	}
	109
	110	static void __net_exit frame_nat_net_exit(struct net *net)
	111	{
f54e9367	112	ebt_unregister_table(net, net->xt.frame_nat);
b71b30a6 AD	113	}
	114
	115	static struct pernet_operations frame_nat_net_ops = {
	116	.init = frame_nat_net_init,
	117	.exit = frame_nat_net_exit,
	118	};
	119
65b4b4e8	120	static int __init ebtable_nat_init(void)
1da177e4	121	{
e40f51a3	122	int ret;
1da177e4	123
b71b30a6 AD	124	ret = register_pernet_subsys(&frame_nat_net_ops);
	125	if (ret < 0)
	126	return ret;
e40f51a3 AD	127	ret = nf_register_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
e40f51a3 AD	128	if (ret < 0)
b71b30a6	129	unregister_pernet_subsys(&frame_nat_net_ops);
1da177e4 LT	130	return ret;
	131	}
	132
65b4b4e8	133	static void __exit ebtable_nat_fini(void)
1da177e4	134	{
e40f51a3	135	nf_unregister_hooks(ebt_ops_nat, ARRAY_SIZE(ebt_ops_nat));
b71b30a6	136	unregister_pernet_subsys(&frame_nat_net_ops);
1da177e4 LT	137	}
1da177e4 LT	138
65b4b4e8 AM	139	module_init(ebtable_nat_init);
65b4b4e8 AM	140	module_exit(ebtable_nat_fini);
1da177e4	141	MODULE_LICENSE("GPL");