[linux-2.6-block.git] / net / ipv4 / xfrm4_tunnel.c

/* xfrm4_tunnel.c: Generic IP tunnel transformer.
 *
 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
 */

#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/protocol.h>

static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
{
	struct iphdr *iph;
	
	iph = skb->nh.iph;
	iph->tot_len = htons(skb->len);
	ip_send_check(iph);

	return 0;
}

static int ipip_xfrm_rcv(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
{
	return 0;
}

static struct xfrm_tunnel *ipip_handler;
static DEFINE_MUTEX(xfrm4_tunnel_mutex);

int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
{
	int ret;

	mutex_lock(&xfrm4_tunnel_mutex);
	ret = 0;
	if (ipip_handler != NULL)
		ret = -EINVAL;
	if (!ret)
		ipip_handler = handler;
	mutex_unlock(&xfrm4_tunnel_mutex);

	return ret;
}

EXPORT_SYMBOL(xfrm4_tunnel_register);

int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
{
	int ret;

	mutex_lock(&xfrm4_tunnel_mutex);
	ret = 0;
	if (ipip_handler != handler)
		ret = -EINVAL;
	if (!ret)
		ipip_handler = NULL;
	mutex_unlock(&xfrm4_tunnel_mutex);

	synchronize_net();

	return ret;
}

EXPORT_SYMBOL(xfrm4_tunnel_deregister);

static int ipip_rcv(struct sk_buff *skb)
{
	struct xfrm_tunnel *handler = ipip_handler;

	/* Tunnel devices take precedence.  */
	if (handler && handler->handler(skb) == 0)
		return 0;

	return xfrm4_rcv(skb);
}

static void ipip_err(struct sk_buff *skb, u32 info)
{
	struct xfrm_tunnel *handler = ipip_handler;

	if (handler)
		handler->err_handler(skb, info);
}

static int ipip_init_state(struct xfrm_state *x)
{
	if (!x->props.mode)
		return -EINVAL;

	if (x->encap)
		return -EINVAL;

	x->props.header_len = sizeof(struct iphdr);

	return 0;
}

static void ipip_destroy(struct xfrm_state *x)
{
}

static struct xfrm_type ipip_type = {
	.description	= "IPIP",
	.owner		= THIS_MODULE,
	.proto	     	= IPPROTO_IPIP,
	.init_state	= ipip_init_state,
	.destructor	= ipip_destroy,
	.input		= ipip_xfrm_rcv,
	.output		= ipip_output
};

static struct net_protocol ipip_protocol = {
	.handler	=	ipip_rcv,
	.err_handler	=	ipip_err,
	.no_policy	=	1,
};

static int __init ipip_init(void)
{
	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
		printk(KERN_INFO "ipip init: can't add xfrm type\n");
		return -EAGAIN;
	}
	if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) {
		printk(KERN_INFO "ipip init: can't add protocol\n");
		xfrm_unregister_type(&ipip_type, AF_INET);
		return -EAGAIN;
	}
	return 0;
}

static void __exit ipip_fini(void)
{
	if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0)
		printk(KERN_INFO "ipip close: can't remove protocol\n");
	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
		printk(KERN_INFO "ipip close: can't remove xfrm type\n");
}

module_init(ipip_init);
module_exit(ipip_fini);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/* xfrm4_tunnel.c: Generic IP tunnel transformer.
	2	*
	3	* Copyright (C) 2003 David S. Miller (davem@redhat.com)
	4	*/
	5
	6	#include <linux/skbuff.h>
	7	#include <linux/module.h>
4a3e2f71	8	#include <linux/mutex.h>
1da177e4 LT	9	#include <net/xfrm.h>
	10	#include <net/ip.h>
	11	#include <net/protocol.h>
	12
	13	static int ipip_output(struct xfrm_state x, struct sk_buff skb)
	14	{
	15	struct iphdr *iph;
	16
	17	iph = skb->nh.iph;
	18	iph->tot_len = htons(skb->len);
	19	ip_send_check(iph);
	20
	21	return 0;
	22	}
	23
	24	static int ipip_xfrm_rcv(struct xfrm_state x, struct xfrm_decap_state decap, struct sk_buff *skb)
	25	{
	26	return 0;
	27	}
	28
	29	static struct xfrm_tunnel *ipip_handler;
4a3e2f71	30	static DEFINE_MUTEX(xfrm4_tunnel_mutex);
1da177e4 LT	31
	32	int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
	33	{
	34	int ret;
	35
4a3e2f71	36	mutex_lock(&xfrm4_tunnel_mutex);
1da177e4 LT	37	ret = 0;
	38	if (ipip_handler != NULL)
	39	ret = -EINVAL;
	40	if (!ret)
	41	ipip_handler = handler;
4a3e2f71	42	mutex_unlock(&xfrm4_tunnel_mutex);
1da177e4 LT	43
	44	return ret;
	45	}
	46
	47	EXPORT_SYMBOL(xfrm4_tunnel_register);
	48
	49	int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
	50	{
	51	int ret;
	52
4a3e2f71	53	mutex_lock(&xfrm4_tunnel_mutex);
1da177e4 LT	54	ret = 0;
	55	if (ipip_handler != handler)
	56	ret = -EINVAL;
	57	if (!ret)
	58	ipip_handler = NULL;
4a3e2f71	59	mutex_unlock(&xfrm4_tunnel_mutex);
1da177e4 LT	60
	61	synchronize_net();
	62
	63	return ret;
	64	}
	65
	66	EXPORT_SYMBOL(xfrm4_tunnel_deregister);
	67
	68	static int ipip_rcv(struct sk_buff *skb)
	69	{
	70	struct xfrm_tunnel *handler = ipip_handler;
	71
	72	/* Tunnel devices take precedence. */
	73	if (handler && handler->handler(skb) == 0)
	74	return 0;
	75
	76	return xfrm4_rcv(skb);
	77	}
	78
	79	static void ipip_err(struct sk_buff *skb, u32 info)
	80	{
	81	struct xfrm_tunnel *handler = ipip_handler;
1da177e4 LT	82
1da177e4 LT	83	if (handler)
0303770d	84	handler->err_handler(skb, info);
1da177e4 LT	85	}
1da177e4 LT	86
72cb6962	87	static int ipip_init_state(struct xfrm_state *x)
1da177e4 LT	88	{
	89	if (!x->props.mode)
	90	return -EINVAL;
	91
	92	if (x->encap)
	93	return -EINVAL;
	94
	95	x->props.header_len = sizeof(struct iphdr);
	96
	97	return 0;
	98	}
	99
	100	static void ipip_destroy(struct xfrm_state *x)
	101	{
	102	}
	103
	104	static struct xfrm_type ipip_type = {
	105	.description = "IPIP",
	106	.owner = THIS_MODULE,
	107	.proto = IPPROTO_IPIP,
	108	.init_state = ipip_init_state,
	109	.destructor = ipip_destroy,
	110	.input = ipip_xfrm_rcv,
	111	.output = ipip_output
	112	};
	113
	114	static struct net_protocol ipip_protocol = {
	115	.handler = ipip_rcv,
	116	.err_handler = ipip_err,
	117	.no_policy = 1,
	118	};
	119
	120	static int __init ipip_init(void)
	121	{
	122	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
	123	printk(KERN_INFO "ipip init: can't add xfrm type\n");
	124	return -EAGAIN;
	125	}
	126	if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) {
	127	printk(KERN_INFO "ipip init: can't add protocol\n");
	128	xfrm_unregister_type(&ipip_type, AF_INET);
	129	return -EAGAIN;
	130	}
	131	return 0;
	132	}
	133
	134	static void __exit ipip_fini(void)
	135	{
	136	if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0)
	137	printk(KERN_INFO "ipip close: can't remove protocol\n");
	138	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
	139	printk(KERN_INFO "ipip close: can't remove xfrm type\n");
	140	}
	141
	142	module_init(ipip_init);
	143	module_exit(ipip_fini);
	144	MODULE_LICENSE("GPL");