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
13 static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
14 {
15 skb_push(skb, -skb_network_offset(skb));
16 return 0;
17 }
18
19 static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
20 {
21 return ip_hdr(skb)->protocol;
22 }
23
24 static int ipip_init_state(struct xfrm_state *x)
25 {
26 if (x->props.mode != XFRM_MODE_TUNNEL)
27 return -EINVAL;
28
29 if (x->encap)
30 return -EINVAL;
31
32 x->props.header_len = sizeof(struct iphdr);
33
34 return 0;
35 }
36
37 static void ipip_destroy(struct xfrm_state *x)
38 {
39 }
40
41 static const struct xfrm_type ipip_type = {
42 .description = "IPIP",
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
51 static int xfrm_tunnel_rcv(struct sk_buff *skb)
52 {
53 return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
54 }
55
56 static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
57 {
58 return -ENOENT;
59 }
60
61 static struct xfrm_tunnel xfrm_tunnel_handler = {
62 .handler = xfrm_tunnel_rcv,
63 .err_handler = xfrm_tunnel_err,
64 .priority = 2,
65 };
66
67 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
68 static struct xfrm_tunnel xfrm64_tunnel_handler = {
69 .handler = xfrm_tunnel_rcv,
70 .err_handler = xfrm_tunnel_err,
71 .priority = 2,
72 };
73 #endif
74
75 static int __init ipip_init(void)
76 {
77 if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
78 printk(KERN_INFO "ipip init: can't add xfrm type\n");
79 return -EAGAIN;
80 }
81
82 if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
83 printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
84 xfrm_unregister_type(&ipip_type, AF_INET);
85 return -EAGAIN;
86 }
87 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
88 if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
89 printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
90 xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
91 xfrm_unregister_type(&ipip_type, AF_INET);
92 return -EAGAIN;
93 }
94 #endif
95 return 0;
96 }
97
98 static void __exit ipip_fini(void)
99 {
100 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
101 if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
102 printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
103 #endif
104 if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
105 printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
106 if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
107 printk(KERN_INFO "ipip close: can't remove xfrm type\n");
108 }
109
110 module_init(ipip_init);
111 module_exit(ipip_fini);
112 MODULE_LICENSE("GPL");
113 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);
114
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