[deliverable/linux.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 const struct ebt_table frame_filter = {
	.name		= "filter",
	.table		= &initial_table,
	.valid_hooks	= FILTER_VALID_HOOKS,
	.check		= check,
	.me		= THIS_MODULE,
};

static unsigned int
ebt_in_hook(void *priv, struct sk_buff *skb,
	    const struct nf_hook_state *state)
{
	return ebt_do_table(skb, state, state->net->xt.frame_filter);
}

static unsigned int
ebt_out_hook(void *priv, struct sk_buff *skb,
	     const struct nf_hook_state *state)
{
	return ebt_do_table(skb, state, state->net->xt.frame_filter);
}

static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
	{
		.hook		= ebt_in_hook,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_LOCAL_IN,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_in_hook,
		.pf		= NFPROTO_BRIDGE,
		.hooknum	= NF_BR_FORWARD,
		.priority	= NF_BR_PRI_FILTER_BRIDGED,
	},
	{
		.hook		= ebt_out_hook,
		.pf		= NFPROTO_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);
	return PTR_ERR_OR_ZERO(net->xt.frame_filter);
}

static void __net_exit frame_filter_net_exit(struct net *net)
{
	ebt_unregister_table(net, 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) \| \
052a4bc4	15	(1 << NF_BR_LOCAL_OUT))
1da177e4	16
97ad8b53	17	static struct ebt_entries initial_chains[] = {
1da177e4 LT	18	{
	19	.name = "INPUT",
	20	.policy = EBT_ACCEPT,
	21	},
	22	{
	23	.name = "FORWARD",
	24	.policy = EBT_ACCEPT,
	25	},
	26	{
	27	.name = "OUTPUT",
	28	.policy = EBT_ACCEPT,
	29	},
	30	};
	31
97ad8b53	32	static struct ebt_replace_kernel initial_table = {
1da177e4 LT	33	.name = "filter",
	34	.valid_hooks = FILTER_VALID_HOOKS,
	35	.entries_size = 3 * sizeof(struct ebt_entries),
	36	.hook_entry = {
	37	[NF_BR_LOCAL_IN] = &initial_chains[0],
	38	[NF_BR_FORWARD] = &initial_chains[1],
	39	[NF_BR_LOCAL_OUT] = &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 & ~FILTER_VALID_HOOKS)
	47	return -EINVAL;
	48	return 0;
	49	}
	50
97ad8b53	51	static const struct ebt_table frame_filter = {
1da177e4 LT	52	.name = "filter",
1da177e4 LT	53	.table = &initial_table,
9d6f229f	54	.valid_hooks = FILTER_VALID_HOOKS,
1da177e4 LT	55	.check = check,
	56	.me = THIS_MODULE,
	57	};
	58
	59	static unsigned int
06198b34	60	ebt_in_hook(void priv, struct sk_buff skb,
238e54c9	61	const struct nf_hook_state *state)
1da177e4	62	{
97b59c3a	63	return ebt_do_table(skb, state, state->net->xt.frame_filter);
4aad1093 AD	64	}
	65
	66	static unsigned int
06198b34	67	ebt_out_hook(void priv, struct sk_buff skb,
238e54c9	68	const struct nf_hook_state *state)
4aad1093	69	{
97b59c3a	70	return ebt_do_table(skb, state, state->net->xt.frame_filter);
1da177e4 LT	71	}
1da177e4 LT	72
1999414a	73	static struct nf_hook_ops ebt_ops_filter[] __read_mostly = {
1da177e4	74	{
4aad1093	75	.hook = ebt_in_hook,
24c232d8	76	.pf = NFPROTO_BRIDGE,
1da177e4 LT	77	.hooknum = NF_BR_LOCAL_IN,
	78	.priority = NF_BR_PRI_FILTER_BRIDGED,
	79	},
	80	{
4aad1093	81	.hook = ebt_in_hook,
24c232d8	82	.pf = NFPROTO_BRIDGE,
1da177e4 LT	83	.hooknum = NF_BR_FORWARD,
	84	.priority = NF_BR_PRI_FILTER_BRIDGED,
	85	},
	86	{
4aad1093	87	.hook = ebt_out_hook,
24c232d8	88	.pf = NFPROTO_BRIDGE,
1da177e4 LT	89	.hooknum = NF_BR_LOCAL_OUT,
	90	.priority = NF_BR_PRI_FILTER_OTHER,
	91	},
	92	};
	93
4aad1093 AD	94	static int __net_init frame_filter_net_init(struct net *net)
	95	{
	96	net->xt.frame_filter = ebt_register_table(net, &frame_filter);
8c6ffba0	97	return PTR_ERR_OR_ZERO(net->xt.frame_filter);
4aad1093 AD	98	}
	99
	100	static void __net_exit frame_filter_net_exit(struct net *net)
	101	{
f54e9367	102	ebt_unregister_table(net, net->xt.frame_filter);
4aad1093 AD	103	}
	104
	105	static struct pernet_operations frame_filter_net_ops = {
	106	.init = frame_filter_net_init,
	107	.exit = frame_filter_net_exit,
	108	};
	109
65b4b4e8	110	static int __init ebtable_filter_init(void)
1da177e4	111	{
e40f51a3	112	int ret;
1da177e4	113
4aad1093 AD	114	ret = register_pernet_subsys(&frame_filter_net_ops);
	115	if (ret < 0)
	116	return ret;
e40f51a3 AD	117	ret = nf_register_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
e40f51a3 AD	118	if (ret < 0)
4aad1093	119	unregister_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	120	return ret;
	121	}
	122
65b4b4e8	123	static void __exit ebtable_filter_fini(void)
1da177e4	124	{
e40f51a3	125	nf_unregister_hooks(ebt_ops_filter, ARRAY_SIZE(ebt_ops_filter));
4aad1093	126	unregister_pernet_subsys(&frame_filter_net_ops);
1da177e4 LT	127	}
1da177e4 LT	128
65b4b4e8 AM	129	module_init(ebtable_filter_init);
65b4b4e8 AM	130	module_exit(ebtable_filter_fini);
1da177e4	131	MODULE_LICENSE("GPL");