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

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

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

#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
   (1 << NF_BR_LOCAL_OUT))

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

static struct ebt_replace_kernel initial_table =
{
	.name		= "filter",
	.valid_hooks	= FILTER_VALID_HOOKS,
	.entries_size	= 3 * sizeof(struct ebt_entries),
	.hook_entry	= {
		[NF_BR_LOCAL_IN]	= &initial_chains[0],
		[NF_BR_FORWARD]		= &initial_chains[1],
		[NF_BR_LOCAL_OUT]	= &initial_chains[2],
	},
	.entries	= (char *)initial_chains,
};

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

static struct ebt_table frame_filter =
{
	.name		= "filter",
	.table		= &initial_table,
	.valid_hooks	= FILTER_VALID_HOOKS,
	.lock		= __RW_LOCK_UNLOCKED(frame_filter.lock),
	.check		= check,
	.me		= THIS_MODULE,
};

static unsigned int
ebt_in_hook(unsigned int hook, struct sk_buff *skb, const struct net_device *in,
   const struct net_device *out, int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(hook, skb, in, out, dev_net(in)->xt.frame_filter);
}

static unsigned int
ebt_out_hook(unsigned int hook, struct sk_buff *skb, const struct net_device *in,
   const struct net_device *out, int (*okfn)(struct sk_buff *))
{
	return ebt_do_table(hook, skb, in, out, dev_net(out)->xt.frame_filter);
}

static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
	{
		.hook		= ebt_in_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_LOCAL_IN,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_in_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_FORWARD,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_out_hook,
		.owner		= THIS_MODULE,
		.pf		= PF_BRIDGE,
		.hooknum	= NF_BR_LOCAL_OUT,
		.priority	= NF_BR_PRI_FILTER_OTHER,
	},
};

static int __net_init frame_filter_net_init(struct net *net)
{
	net->xt.frame_filter = ebt_register_table(net, &frame_filter);
	if (IS_ERR(net->xt.frame_filter))
		return PTR_ERR(net->xt.frame_filter);
	return 0;
}

static void __net_exit frame_filter_net_exit(struct net *net)
{
	ebt_unregister_table(net->xt.frame_filter);
}

static struct pernet_operations frame_filter_net_ops = {
	.init = frame_filter_net_init,
	.exit = frame_filter_net_exit,
};

static int __init ebtable_filter_init(void)
{
	int ret;

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

static void __exit ebtable_filter_fini(void)
{
	nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
	unregister_pernet_subsys(&frame_filter_net_ops);
}

module_init(ebtable_filter_init);
module_exit(ebtable_filter_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ebtable_filter
	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 FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) \| (1 << NF_BR_FORWARD) \| \
	15	(1 << NF_BR_LOCAL_OUT))
	16
	17	static struct ebt_entries initial_chains[] =
	18	{
	19	{
	20	.name = "INPUT",
	21	.policy = EBT_ACCEPT,
	22	},
	23	{
	24	.name = "FORWARD",
	25	.policy = EBT_ACCEPT,
	26	},
	27	{
	28	.name = "OUTPUT",
	29	.policy = EBT_ACCEPT,
	30	},
	31	};
	32
1e419cd9	33	static struct ebt_replace_kernel initial_table =
1da177e4 LT	34	{
	35	.name = "filter",
	36	.valid_hooks = FILTER_VALID_HOOKS,
	37	.entries_size = 3 * sizeof(struct ebt_entries),
	38	.hook_entry = {
	39	[NF_BR_LOCAL_IN] = &initial_chains[0],
	40	[NF_BR_FORWARD] = &initial_chains[1],
	41	[NF_BR_LOCAL_OUT] = &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 & ~FILTER_VALID_HOOKS)
	49	return -EINVAL;
	50	return 0;
	51	}
	52
4aad1093	53	static struct ebt_table frame_filter =
9d6f229f	54	{
1da177e4 LT	55	.name = "filter",
1da177e4 LT	56	.table = &initial_table,
9d6f229f	57	.valid_hooks = FILTER_VALID_HOOKS,
4aad1093	58	.lock = __RW_LOCK_UNLOCKED(frame_filter.lock),
1da177e4 LT	59	.check = check,
	60	.me = THIS_MODULE,
	61	};
	62
	63	static unsigned int
4aad1093	64	ebt_in_hook(unsigned int hook, struct sk_buff skb, const struct net_device in,
1da177e4 LT	65	const struct net_device out, int (okfn)(struct sk_buff *))
1da177e4 LT	66	{
4aad1093 AD	67	return ebt_do_table(hook, skb, in, out, dev_net(in)->xt.frame_filter);
	68	}
	69
	70	static unsigned int
	71	ebt_out_hook(unsigned int hook, struct sk_buff skb, const struct net_device in,
	72	const struct net_device out, int (okfn)(struct sk_buff *))
	73	{
	74	return ebt_do_table(hook, skb, in, out, dev_net(out)->xt.frame_filter);
1da177e4 LT	75	}
1da177e4 LT	76
1999414a	77	static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
1da177e4	78	{
4aad1093	79	.hook = ebt_in_hook,
1da177e4 LT	80	.owner = THIS_MODULE,
	81	.pf = PF_BRIDGE,
	82	.hooknum = NF_BR_LOCAL_IN,
	83	.priority = NF_BR_PRI_FILTER_BRIDGED,
	84	},
	85	{
4aad1093	86	.hook = ebt_in_hook,
1da177e4 LT	87	.owner = THIS_MODULE,
	88	.pf = PF_BRIDGE,
	89	.hooknum = NF_BR_FORWARD,
	90	.priority = NF_BR_PRI_FILTER_BRIDGED,
	91	},
	92	{
4aad1093	93	.hook = ebt_out_hook,
1da177e4 LT	94	.owner = THIS_MODULE,
	95	.pf = PF_BRIDGE,
	96	.hooknum = NF_BR_LOCAL_OUT,
	97	.priority = NF_BR_PRI_FILTER_OTHER,
	98	},
	99	};
	100
4aad1093 AD	101	static int __net_init frame_filter_net_init(struct net *net)
	102	{
	103	net->xt.frame_filter = ebt_register_table(net, &frame_filter);
	104	if (IS_ERR(net->xt.frame_filter))
	105	return PTR_ERR(net->xt.frame_filter);
	106	return 0;
	107	}
	108
	109	static void __net_exit frame_filter_net_exit(struct net *net)
	110	{
	111	ebt_unregister_table(net->xt.frame_filter);
	112	}
	113
	114	static struct pernet_operations frame_filter_net_ops = {
	115	.init = frame_filter_net_init,
	116	.exit = frame_filter_net_exit,
	117	};
	118
65b4b4e8	119	static int __init ebtable_filter_init(void)
1da177e4	120	{
e40f51a3	121	int ret;
1da177e4	122
4aad1093 AD	123	ret = register_pernet_subsys(&frame_filter_net_ops);
	124	if (ret < 0)
	125	return ret;
e40f51a3 AD	126	ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
e40f51a3 AD	127	if (ret < 0)
4aad1093	128	unregister_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	129	return ret;
	130	}
	131
65b4b4e8	132	static void __exit ebtable_filter_fini(void)
1da177e4	133	{
e40f51a3	134	nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
4aad1093	135	unregister_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	136	}
1da177e4 LT	137
65b4b4e8 AM	138	module_init(ebtable_filter_init);
65b4b4e8 AM	139	module_exit(ebtable_filter_fini);
1da177e4	140	MODULE_LICENSE("GPL");