[mirror_ubuntu-jammy-kernel.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 = ip_hdr(skb);

	iph->tot_len = htons(skb->len);
	ip_send_check(iph);

	return 0;
}

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

static int ipip_init_state(struct xfrm_state *x)
{
	if (x->props.mode != XFRM_MODE_TUNNEL)
		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 int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
{
	return -ENOENT;
}

static struct xfrm_tunnel xfrm_tunnel_handler = {
	.handler	=	xfrm4_rcv,
	.err_handler	=	xfrm_tunnel_err,
	.priority	=	2,
};

#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static struct xfrm_tunnel xfrm64_tunnel_handler = {
	.handler	=	xfrm4_rcv,
	.err_handler	=	xfrm_tunnel_err,
	.priority	=	2,
};
#endif

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 (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
		printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
		xfrm_unregister_type(&ipip_type, AF_INET);
		return -EAGAIN;
	}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
		printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
		xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
		xfrm_unregister_type(&ipip_type, AF_INET);
		return -EAGAIN;
	}
#endif
	return 0;
}

static void __exit ipip_fini(void)
{
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
		printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
#endif
	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
		printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\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	{
eddc9ec5	15	struct iphdr *iph = ip_hdr(skb);
e905a9ed	16
1da177e4 LT	17	iph->tot_len = htons(skb->len);
	18	ip_send_check(iph);
	19
	20	return 0;
	21	}
	22
e695633e	23	static int ipip_xfrm_rcv(struct xfrm_state x, struct sk_buff skb)
1da177e4 LT	24	{
	25	return 0;
	26	}
	27
72cb6962	28	static int ipip_init_state(struct xfrm_state *x)
1da177e4	29	{
7e49e6de	30	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	31	return -EINVAL;
	32
	33	if (x->encap)
	34	return -EINVAL;
	35
	36	x->props.header_len = sizeof(struct iphdr);
	37
	38	return 0;
	39	}
	40
	41	static void ipip_destroy(struct xfrm_state *x)
	42	{
	43	}
	44
	45	static struct xfrm_type ipip_type = {
	46	.description = "IPIP",
	47	.owner = THIS_MODULE,
	48	.proto = IPPROTO_IPIP,
	49	.init_state = ipip_init_state,
	50	.destructor = ipip_destroy,
	51	.input = ipip_xfrm_rcv,
	52	.output = ipip_output
	53	};
	54
d2acc347 HX	55	static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
	56	{
	57	return -ENOENT;
	58	}
	59
	60	static struct xfrm_tunnel xfrm_tunnel_handler = {
	61	.handler = xfrm4_rcv,
	62	.err_handler = xfrm_tunnel_err,
	63	.priority = 2,
1da177e4 LT	64	};
1da177e4 LT	65
c0d56408 KM	66	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	67	static struct xfrm_tunnel xfrm64_tunnel_handler = {
	68	.handler = xfrm4_rcv,
	69	.err_handler = xfrm_tunnel_err,
	70	.priority = 2,
	71	};
	72	#endif
	73
1da177e4 LT	74	static int __init ipip_init(void)
	75	{
	76	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
	77	printk(KERN_INFO "ipip init: can't add xfrm type\n");
	78	return -EAGAIN;
	79	}
c0d56408 KM	80
	81	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
	82	printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
	83	xfrm_unregister_type(&ipip_type, AF_INET);
	84	return -EAGAIN;
	85	}
	86	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	87	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
	88	printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
	89	xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
1da177e4 LT	90	xfrm_unregister_type(&ipip_type, AF_INET);
	91	return -EAGAIN;
	92	}
c0d56408	93	#endif
1da177e4 LT	94	return 0;
	95	}
	96
	97	static void __exit ipip_fini(void)
	98	{
c0d56408 KM	99	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	100	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
	101	printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
	102	#endif
	103	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
	104	printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
1da177e4 LT	105	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
	106	printk(KERN_INFO "ipip close: can't remove xfrm type\n");
	107	}
	108
	109	module_init(ipip_init);
	110	module_exit(ipip_fini);
	111	MODULE_LICENSE("GPL");