[mirror_ubuntu-jammy-kernel.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 <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
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>
1da177e4 LT	10	#include <linux/module.h>
4a3e2f71	11	#include <linux/mutex.h>
1da177e4 LT	12	#include <net/xfrm.h>
	13	#include <net/ip.h>
	14	#include <net/protocol.h>
	15
	16	static int ipip_output(struct xfrm_state x, struct sk_buff skb)
	17	{
7b277b1a	18	skb_push(skb, -skb_network_offset(skb));
1da177e4 LT	19	return 0;
	20	}
	21
e695633e	22	static int ipip_xfrm_rcv(struct xfrm_state x, struct sk_buff skb)
1da177e4	23	{
04663d0b	24	return ip_hdr(skb)->protocol;
1da177e4 LT	25	}
1da177e4 LT	26
72cb6962	27	static int ipip_init_state(struct xfrm_state *x)
1da177e4	28	{
7e49e6de	29	if (x->props.mode != XFRM_MODE_TUNNEL)
1da177e4 LT	30	return -EINVAL;
	31
	32	if (x->encap)
	33	return -EINVAL;
	34
	35	x->props.header_len = sizeof(struct iphdr);
	36
	37	return 0;
	38	}
	39
	40	static void ipip_destroy(struct xfrm_state *x)
	41	{
	42	}
	43
533cb5b0	44	static const struct xfrm_type ipip_type = {
1da177e4 LT	45	.description = "IPIP",
	46	.owner = THIS_MODULE,
	47	.proto = IPPROTO_IPIP,
	48	.init_state = ipip_init_state,
	49	.destructor = ipip_destroy,
	50	.input = ipip_xfrm_rcv,
	51	.output = ipip_output
	52	};
	53
c4541b41 HX	54	static int xfrm_tunnel_rcv(struct sk_buff *skb)
c4541b41 HX	55	{
b1641064	56	return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
c4541b41 HX	57	}
c4541b41 HX	58
d2acc347 HX	59	static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
	60	{
	61	return -ENOENT;
	62	}
	63
6dcd814b	64	static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
c4541b41	65	.handler = xfrm_tunnel_rcv,
d2acc347	66	.err_handler = xfrm_tunnel_err,
32b8a8e5	67	.priority = 3,
1da177e4 LT	68	};
1da177e4 LT	69
dfd56b8b	70	#if IS_ENABLED(CONFIG_IPV6)
6dcd814b	71	static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
c4541b41	72	.handler = xfrm_tunnel_rcv,
c0d56408 KM	73	.err_handler = xfrm_tunnel_err,
	74	.priority = 2,
	75	};
	76	#endif
	77
1da177e4 LT	78	static int __init ipip_init(void)
	79	{
	80	if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
058bd4d2	81	pr_info("%s: can't add xfrm type\n", __func__);
1da177e4 LT	82	return -EAGAIN;
1da177e4 LT	83	}
c0d56408 KM	84
c0d56408 KM	85	if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
058bd4d2	86	pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
c0d56408 KM	87	xfrm_unregister_type(&ipip_type, AF_INET);
	88	return -EAGAIN;
	89	}
dfd56b8b	90	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	91	if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
058bd4d2	92	pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
c0d56408	93	xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
1da177e4 LT	94	xfrm_unregister_type(&ipip_type, AF_INET);
	95	return -EAGAIN;
	96	}
c0d56408	97	#endif
1da177e4 LT	98	return 0;
	99	}
	100
	101	static void __exit ipip_fini(void)
	102	{
dfd56b8b	103	#if IS_ENABLED(CONFIG_IPV6)
c0d56408	104	if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
058bd4d2 JP	105	pr_info("%s: can't remove xfrm handler for AF_INET6\n",
058bd4d2 JP	106	__func__);
c0d56408 KM	107	#endif
c0d56408 KM	108	if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
058bd4d2 JP	109	pr_info("%s: can't remove xfrm handler for AF_INET\n",
058bd4d2 JP	110	__func__);
1da177e4	111	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
058bd4d2	112	pr_info("%s: can't remove xfrm type\n", __func__);
1da177e4 LT	113	}
	114
	115	module_init(ipip_init);
	116	module_exit(ipip_fini);
	117	MODULE_LICENSE("GPL");
d3d6dd3a	118	MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);