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1da177e4 LT |
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> | |
4a3e2f71 | 8 | #include <linux/mutex.h> |
1da177e4 LT |
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 | struct iphdr *iph; | |
16 | ||
17 | iph = skb->nh.iph; | |
18 | iph->tot_len = htons(skb->len); | |
19 | ip_send_check(iph); | |
20 | ||
21 | return 0; | |
22 | } | |
23 | ||
24 | static int ipip_xfrm_rcv(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb) | |
25 | { | |
26 | return 0; | |
27 | } | |
28 | ||
29 | static struct xfrm_tunnel *ipip_handler; | |
4a3e2f71 | 30 | static DEFINE_MUTEX(xfrm4_tunnel_mutex); |
1da177e4 LT |
31 | |
32 | int xfrm4_tunnel_register(struct xfrm_tunnel *handler) | |
33 | { | |
34 | int ret; | |
35 | ||
4a3e2f71 | 36 | mutex_lock(&xfrm4_tunnel_mutex); |
1da177e4 LT |
37 | ret = 0; |
38 | if (ipip_handler != NULL) | |
39 | ret = -EINVAL; | |
40 | if (!ret) | |
41 | ipip_handler = handler; | |
4a3e2f71 | 42 | mutex_unlock(&xfrm4_tunnel_mutex); |
1da177e4 LT |
43 | |
44 | return ret; | |
45 | } | |
46 | ||
47 | EXPORT_SYMBOL(xfrm4_tunnel_register); | |
48 | ||
49 | int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler) | |
50 | { | |
51 | int ret; | |
52 | ||
4a3e2f71 | 53 | mutex_lock(&xfrm4_tunnel_mutex); |
1da177e4 LT |
54 | ret = 0; |
55 | if (ipip_handler != handler) | |
56 | ret = -EINVAL; | |
57 | if (!ret) | |
58 | ipip_handler = NULL; | |
4a3e2f71 | 59 | mutex_unlock(&xfrm4_tunnel_mutex); |
1da177e4 LT |
60 | |
61 | synchronize_net(); | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | EXPORT_SYMBOL(xfrm4_tunnel_deregister); | |
67 | ||
68 | static int ipip_rcv(struct sk_buff *skb) | |
69 | { | |
70 | struct xfrm_tunnel *handler = ipip_handler; | |
71 | ||
72 | /* Tunnel devices take precedence. */ | |
73 | if (handler && handler->handler(skb) == 0) | |
74 | return 0; | |
75 | ||
76 | return xfrm4_rcv(skb); | |
77 | } | |
78 | ||
79 | static void ipip_err(struct sk_buff *skb, u32 info) | |
80 | { | |
81 | struct xfrm_tunnel *handler = ipip_handler; | |
1da177e4 LT |
82 | |
83 | if (handler) | |
0303770d | 84 | handler->err_handler(skb, info); |
1da177e4 LT |
85 | } |
86 | ||
72cb6962 | 87 | static int ipip_init_state(struct xfrm_state *x) |
1da177e4 LT |
88 | { |
89 | if (!x->props.mode) | |
90 | return -EINVAL; | |
91 | ||
92 | if (x->encap) | |
93 | return -EINVAL; | |
94 | ||
95 | x->props.header_len = sizeof(struct iphdr); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static void ipip_destroy(struct xfrm_state *x) | |
101 | { | |
102 | } | |
103 | ||
104 | static struct xfrm_type ipip_type = { | |
105 | .description = "IPIP", | |
106 | .owner = THIS_MODULE, | |
107 | .proto = IPPROTO_IPIP, | |
108 | .init_state = ipip_init_state, | |
109 | .destructor = ipip_destroy, | |
110 | .input = ipip_xfrm_rcv, | |
111 | .output = ipip_output | |
112 | }; | |
113 | ||
114 | static struct net_protocol ipip_protocol = { | |
115 | .handler = ipip_rcv, | |
116 | .err_handler = ipip_err, | |
117 | .no_policy = 1, | |
118 | }; | |
119 | ||
120 | static int __init ipip_init(void) | |
121 | { | |
122 | if (xfrm_register_type(&ipip_type, AF_INET) < 0) { | |
123 | printk(KERN_INFO "ipip init: can't add xfrm type\n"); | |
124 | return -EAGAIN; | |
125 | } | |
126 | if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) { | |
127 | printk(KERN_INFO "ipip init: can't add protocol\n"); | |
128 | xfrm_unregister_type(&ipip_type, AF_INET); | |
129 | return -EAGAIN; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static void __exit ipip_fini(void) | |
135 | { | |
136 | if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) | |
137 | printk(KERN_INFO "ipip close: can't remove protocol\n"); | |
138 | if (xfrm_unregister_type(&ipip_type, AF_INET) < 0) | |
139 | printk(KERN_INFO "ipip close: can't remove xfrm type\n"); | |
140 | } | |
141 | ||
142 | module_init(ipip_init); | |
143 | module_exit(ipip_fini); | |
144 | MODULE_LICENSE("GPL"); |