[deliverable/linux.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 <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 DECLARE_MUTEX(xfrm4_tunnel_sem);

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

	down(&xfrm4_tunnel_sem);
	ret = 0;
	if (ipip_handler != NULL)
		ret = -EINVAL;
	if (!ret)
		ipip_handler = handler;
	up(&xfrm4_tunnel_sem);

	return ret;
}

EXPORT_SYMBOL(xfrm4_tunnel_register);

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

	down(&xfrm4_tunnel_sem);
	ret = 0;
	if (ipip_handler != handler)
		ret = -EINVAL;
	if (!ret)
		ipip_handler = NULL;
	up(&xfrm4_tunnel_sem);

	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>
	8	#include <net/xfrm.h>
	9	#include <net/ip.h>
	10	#include <net/protocol.h>
	11
	12	static int ipip_output(struct xfrm_state x, struct sk_buff skb)
	13	{
	14	struct iphdr *iph;
	15
	16	iph = skb->nh.iph;
	17	iph->tot_len = htons(skb->len);
	18	ip_send_check(iph);
	19
	20	return 0;
	21	}
	22
	23	static int ipip_xfrm_rcv(struct xfrm_state x, struct xfrm_decap_state decap, struct sk_buff *skb)
	24	{
	25	return 0;
	26	}
	27
	28	static struct xfrm_tunnel *ipip_handler;
	29	static DECLARE_MUTEX(xfrm4_tunnel_sem);
	30
	31	int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
	32	{
	33	int ret;
	34
	35	down(&xfrm4_tunnel_sem);
	36	ret = 0;
	37	if (ipip_handler != NULL)
	38	ret = -EINVAL;
	39	if (!ret)
	40	ipip_handler = handler;
	41	up(&xfrm4_tunnel_sem);
	42
	43	return ret;
	44	}
	45
	46	EXPORT_SYMBOL(xfrm4_tunnel_register);
	47
	48	int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
	49	{
	50	int ret;
	51
	52	down(&xfrm4_tunnel_sem);
	53	ret = 0;
	54	if (ipip_handler != handler)
	55	ret = -EINVAL;
	56	if (!ret)
	57	ipip_handler = NULL;
	58	up(&xfrm4_tunnel_sem);
	59
	60	synchronize_net();
	61
	62	return ret;
	63	}
	64
65	EXPORT_SYMBOL(xfrm4_tunnel_deregister);
66
67	static int ipip_rcv(struct sk_buff *skb)
68	{
69	struct xfrm_tunnel *handler = ipip_handler;
70
71	/* Tunnel devices take precedence. */
72	if (handler && handler->handler(skb) == 0)
73	return 0;
74
75	return xfrm4_rcv(skb);
76	}
77
78	static void ipip_err(struct sk_buff *skb, u32 info)
79	{
80	struct xfrm_tunnel *handler = ipip_handler;
1da177e4 LT	81
1da177e4 LT	82	if (handler)
0303770d	83	handler->err_handler(skb, info);
1da177e4 LT	84	}
1da177e4 LT	85
72cb6962	86	static int ipip_init_state(struct xfrm_state *x)
1da177e4 LT	87	{
	88	if (!x->props.mode)
	89	return -EINVAL;
	90
	91	if (x->encap)
	92	return -EINVAL;
	93
	94	x->props.header_len = sizeof(struct iphdr);
	95
	96	return 0;
	97	}
	98
	99	static void ipip_destroy(struct xfrm_state *x)
	100	{
	101	}
	102
	103	static struct xfrm_type ipip_type = {
	104	.description = "IPIP",
	105	.owner = THIS_MODULE,
	106	.proto = IPPROTO_IPIP,
	107	.init_state = ipip_init_state,
	108	.destructor = ipip_destroy,
	109	.input = ipip_xfrm_rcv,
	110	.output = ipip_output
	111	};
	112
	113	static struct net_protocol ipip_protocol = {
	114	.handler = ipip_rcv,
	115	.err_handler = ipip_err,
	116	.no_policy = 1,
	117	};
	118
	119	static int __init ipip_init(void)
	120	{
	121	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
	122	printk(KERN_INFO "ipip init: can't add xfrm type\n");
	123	return -EAGAIN;
	124	}
	125	if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) {
	126	printk(KERN_INFO "ipip init: can't add protocol\n");
	127	xfrm_unregister_type(&ipip_type, AF_INET);
	128	return -EAGAIN;
	129	}
	130	return 0;
	131	}
	132
	133	static void __exit ipip_fini(void)
	134	{
	135	if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0)
	136	printk(KERN_INFO "ipip close: can't remove protocol\n");
	137	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
	138	printk(KERN_INFO "ipip close: can't remove xfrm type\n");
	139	}
	140
	141	module_init(ipip_init);
	142	module_exit(ipip_fini);
	143	MODULE_LICENSE("GPL");