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 <linux/mutex.h>
9#include <net/xfrm.h>
10#include <net/ip.h>
11#include <net/protocol.h>
12
13static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
14{
15	struct iphdr *iph = ip_hdr(skb);
16
17	iph->tot_len = htons(skb->len);
18	ip_send_check(iph);
19
20	return 0;
21}
22
23static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
24{
25	return 0;
26}
27
28static int ipip_init_state(struct xfrm_state *x)
29{
30	if (x->props.mode != XFRM_MODE_TUNNEL)
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
41static void ipip_destroy(struct xfrm_state *x)
42{
43}
44
45static 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
55static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
56{
57	return -ENOENT;
58}
59
60static struct xfrm_tunnel xfrm_tunnel_handler = {
61	.handler	=	xfrm4_rcv,
62	.err_handler	=	xfrm_tunnel_err,
63	.priority	=	2,
64};
65
66#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
67static struct xfrm_tunnel xfrm64_tunnel_handler = {
68	.handler	=	xfrm4_rcv,
69	.err_handler	=	xfrm_tunnel_err,
70	.priority	=	2,
71};
72#endif
73
74static 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	}
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);
90		xfrm_unregister_type(&ipip_type, AF_INET);
91		return -EAGAIN;
92	}
93#endif
94	return 0;
95}
96
97static void __exit ipip_fini(void)
98{
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");
105	if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
106		printk(KERN_INFO "ipip close: can't remove xfrm type\n");
107}
108
109module_init(ipip_init);
110module_exit(ipip_fini);
111MODULE_LICENSE("GPL");
112