blob: 9275c79119b6f32d9bb69c7c64d9be853378eb7b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08008#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#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{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -070015 struct iphdr *iph = ip_hdr(skb);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090016
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 iph->tot_len = htons(skb->len);
18 ip_send_check(iph);
19
20 return 0;
21}
22
Herbert Xue6956332006-04-01 00:52:46 -080023static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
25 return 0;
26}
27
Herbert Xu72cb6962005-06-20 13:18:08 -070028static int ipip_init_state(struct xfrm_state *x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -070030 if (x->props.mode != XFRM_MODE_TUNNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 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
Herbert Xud2acc342006-03-28 01:12:13 -080055static 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,
Linus Torvalds1da177e2005-04-16 15:20:36 -070064};
65
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080066#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static 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 }
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080080
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");
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 xfrm_unregister_type(&ipip_type, AF_INET);
84 return -EAGAIN;
85 }
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080086#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return 0;
95}
96
97static void __exit ipip_fini(void)
98{
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -080099#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");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 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");
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -0700112MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);