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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 __read_mostly = { |
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 __read_mostly = { |
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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