[linux.git] / net / ipv4 / xfrm4_tunnel.c

/* xfrm4_tunnel.c: Generic IP tunnel transformer.
 *
 * Copyright (C) 2003 David S. Miller ([email protected])
 */

#define pr_fmt(fmt) "IPsec: " fmt

#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)
{
	skb_push(skb, -skb_network_offset(skb));
	return 0;
}

static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
{
	return ip_hdr(skb)->protocol;
}

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 const 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_rcv(struct sk_buff *skb)
{
	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
}

static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
{
	return -ENOENT;
}

static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
	.handler	=	xfrm_tunnel_rcv,
	.err_handler	=	xfrm_tunnel_err,
	.priority	=	3,
};

#if IS_ENABLED(CONFIG_IPV6)
static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
	.handler	=	xfrm_tunnel_rcv,
	.err_handler	=	xfrm_tunnel_err,
	.priority	=	2,
};
#endif

static int __init ipip_init(void)
{
	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
		pr_info("%s: can't add xfrm type\n", __func__);
		return -EAGAIN;
	}

	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
		pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
		xfrm_unregister_type(&ipip_type, AF_INET);
		return -EAGAIN;
	}
#if IS_ENABLED(CONFIG_IPV6)
	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
		pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
		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 IS_ENABLED(CONFIG_IPV6)
	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
		pr_info("%s: can't remove xfrm handler for AF_INET6\n",
			__func__);
#endif
	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
		pr_info("%s: can't remove xfrm handler for AF_INET\n",
			__func__);
	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
		pr_info("%s: can't remove xfrm type\n", __func__);
}

module_init(ipip_init);
module_exit(ipip_fini);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);
Commit	Line	Data
1da177e4 LT	1	/* xfrm4_tunnel.c: Generic IP tunnel transformer.
	2	*
	3	* Copyright (C) 2003 David S. Miller ([email protected])
	4	*/
	5
afd46503 JP	6	#define pr_fmt(fmt) "IPsec: " fmt
afd46503 JP	7
1da177e4 LT	8	#include <linux/skbuff.h>
1da177e4 LT	9	#include <linux/module.h>
4a3e2f71	10	#include <linux/mutex.h>
1da177e4 LT	11	#include <net/xfrm.h>
	12	#include <net/ip.h>
	13	#include <net/protocol.h>
	14
	15	static int ipip_output(struct xfrm_state x, struct sk_buff skb)
	16	{
7b277b1a	17	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	18	return 0;
	19	}
	20
e695633e	21	static int ipip_xfrm_rcv(struct xfrm_state x, struct sk_buff skb)
1da177e4	22	{
04663d0b	23	return ip_hdr(skb)->protocol;
1da177e4 LT	24	}
1da177e4 LT	25
72cb6962	26	static int ipip_init_state(struct xfrm_state *x)
1da177e4	27	{
7e49e6de	28	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	29	return -EINVAL;
	30
	31	if (x->encap)
	32	return -EINVAL;
	33
	34	x->props.header_len = sizeof(struct iphdr);
	35
	36	return 0;
	37	}
	38
	39	static void ipip_destroy(struct xfrm_state *x)
	40	{
	41	}
	42
533cb5b0	43	static const struct xfrm_type ipip_type = {
1da177e4 LT	44	.description = "IPIP",
	45	.owner = THIS_MODULE,
	46	.proto = IPPROTO_IPIP,
	47	.init_state = ipip_init_state,
	48	.destructor = ipip_destroy,
	49	.input = ipip_xfrm_rcv,
	50	.output = ipip_output
	51	};
	52
c4541b41 HX	53	static int xfrm_tunnel_rcv(struct sk_buff *skb)
c4541b41 HX	54	{
b1641064	55	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
c4541b41 HX	56	}
c4541b41 HX	57
d2acc347 HX	58	static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
	59	{
	60	return -ENOENT;
	61	}
	62
6dcd814b	63	static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
c4541b41	64	.handler = xfrm_tunnel_rcv,
d2acc347	65	.err_handler = xfrm_tunnel_err,
32b8a8e5	66	.priority = 3,
1da177e4 LT	67	};
1da177e4 LT	68
dfd56b8b	69	#if IS_ENABLED(CONFIG_IPV6)
6dcd814b	70	static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
c4541b41	71	.handler = xfrm_tunnel_rcv,
c0d56408 KM	72	.err_handler = xfrm_tunnel_err,
	73	.priority = 2,
	74	};
	75	#endif
	76
1da177e4 LT	77	static int __init ipip_init(void)
	78	{
	79	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
058bd4d2	80	pr_info("%s: can't add xfrm type\n", __func__);
1da177e4 LT	81	return -EAGAIN;
1da177e4 LT	82	}
c0d56408 KM	83
c0d56408 KM	84	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
058bd4d2	85	pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
c0d56408 KM	86	xfrm_unregister_type(&ipip_type, AF_INET);
	87	return -EAGAIN;
	88	}
dfd56b8b	89	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	90	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
058bd4d2	91	pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
c0d56408	92	xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
1da177e4 LT	93	xfrm_unregister_type(&ipip_type, AF_INET);
	94	return -EAGAIN;
	95	}
c0d56408	96	#endif
1da177e4 LT	97	return 0;
	98	}
	99
	100	static void __exit ipip_fini(void)
	101	{
dfd56b8b	102	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	103	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
058bd4d2 JP	104	pr_info("%s: can't remove xfrm handler for AF_INET6\n",
058bd4d2 JP	105	__func__);
c0d56408 KM	106	#endif
c0d56408 KM	107	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
058bd4d2 JP	108	pr_info("%s: can't remove xfrm handler for AF_INET\n",
058bd4d2 JP	109	__func__);
1da177e4	110	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
058bd4d2	111	pr_info("%s: can't remove xfrm type\n", __func__);
1da177e4 LT	112	}
	113
	114	module_init(ipip_init);
	115	module_exit(ipip_fini);
	116	MODULE_LICENSE("GPL");
d3d6dd3a	117	MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);