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

// SPDX-License-Identifier: GPL-2.0-only
/* xfrm4_tunnel.c: Generic IP tunnel transformer.
 *
 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
 */

#define pr_fmt(fmt) "IPsec: " fmt

#include <linux/skbuff.h>
#include <linux/module.h>
#include <net/xfrm.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 = {
	.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	=	4,
};

#if IS_ENABLED(CONFIG_IPV6)
static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
	.handler	=	xfrm_tunnel_rcv,
	.err_handler	=	xfrm_tunnel_err,
	.priority	=	3,
};
#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__);
	xfrm_unregister_type(&ipip_type, AF_INET);
}

module_init(ipip_init);
module_exit(ipip_fini);
MODULE_LICENSE("GPL");
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4 LT	2	/* xfrm4_tunnel.c: Generic IP tunnel transformer.
	3	*
	4	* Copyright (C) 2003 David S. Miller (davem@redhat.com)
	5	*/
	6
afd46503 JP	7	#define pr_fmt(fmt) "IPsec: " fmt
afd46503 JP	8
1da177e4 LT	9	#include <linux/skbuff.h>
	10	#include <linux/module.h>
	11	#include <net/xfrm.h>
1da177e4 LT	12	#include <net/protocol.h>
	13
	14	static int ipip_output(struct xfrm_state x, struct sk_buff skb)
	15	{
7b277b1a	16	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	17	return 0;
	18	}
	19
e695633e	20	static int ipip_xfrm_rcv(struct xfrm_state x, struct sk_buff skb)
1da177e4	21	{
04663d0b	22	return ip_hdr(skb)->protocol;
1da177e4 LT	23	}
1da177e4 LT	24
72cb6962	25	static int ipip_init_state(struct xfrm_state *x)
1da177e4	26	{
7e49e6de	27	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	28	return -EINVAL;
	29
	30	if (x->encap)
	31	return -EINVAL;
	32
	33	x->props.header_len = sizeof(struct iphdr);
	34
	35	return 0;
	36	}
	37
	38	static void ipip_destroy(struct xfrm_state *x)
	39	{
	40	}
	41
533cb5b0	42	static const struct xfrm_type ipip_type = {
1da177e4 LT	43	.owner = THIS_MODULE,
	44	.proto = IPPROTO_IPIP,
	45	.init_state = ipip_init_state,
	46	.destructor = ipip_destroy,
	47	.input = ipip_xfrm_rcv,
	48	.output = ipip_output
	49	};
	50
c4541b41 HX	51	static int xfrm_tunnel_rcv(struct sk_buff *skb)
c4541b41 HX	52	{
b1641064	53	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
c4541b41 HX	54	}
c4541b41 HX	55
d2acc347 HX	56	static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
	57	{
	58	return -ENOENT;
	59	}
	60
6dcd814b	61	static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
c4541b41	62	.handler = xfrm_tunnel_rcv,
d2acc347	63	.err_handler = xfrm_tunnel_err,
7fe94612	64	.priority = 4,
1da177e4 LT	65	};
1da177e4 LT	66
dfd56b8b	67	#if IS_ENABLED(CONFIG_IPV6)
6dcd814b	68	static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
c4541b41	69	.handler = xfrm_tunnel_rcv,
c0d56408	70	.err_handler = xfrm_tunnel_err,
7fe94612	71	.priority = 3,
c0d56408 KM	72	};
	73	#endif
	74
1da177e4 LT	75	static int __init ipip_init(void)
	76	{
	77	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
058bd4d2	78	pr_info("%s: can't add xfrm type\n", __func__);
1da177e4 LT	79	return -EAGAIN;
1da177e4 LT	80	}
c0d56408 KM	81
c0d56408 KM	82	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
058bd4d2	83	pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
c0d56408 KM	84	xfrm_unregister_type(&ipip_type, AF_INET);
	85	return -EAGAIN;
	86	}
dfd56b8b	87	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	88	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
058bd4d2	89	pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
c0d56408	90	xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
1da177e4 LT	91	xfrm_unregister_type(&ipip_type, AF_INET);
	92	return -EAGAIN;
	93	}
c0d56408	94	#endif
1da177e4 LT	95	return 0;
	96	}
	97
	98	static void __exit ipip_fini(void)
	99	{
dfd56b8b	100	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	101	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
058bd4d2 JP	102	pr_info("%s: can't remove xfrm handler for AF_INET6\n",
058bd4d2 JP	103	__func__);
c0d56408 KM	104	#endif
c0d56408 KM	105	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
058bd4d2 JP	106	pr_info("%s: can't remove xfrm handler for AF_INET\n",
058bd4d2 JP	107	__func__);
4f518e80	108	xfrm_unregister_type(&ipip_type, AF_INET);
1da177e4 LT	109	}
	110
	111	module_init(ipip_init);
	112	module_exit(ipip_fini);
	113	MODULE_LICENSE("GPL");
d3d6dd3a	114	MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);