[NETFILTER]: nf_nat: fix hanging connections when loading the NAT module
[linux-2.6.git] / net / ipv4 / xfrm4_tunnel.c
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         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 sk_buff *skb)
25 {
26         return 0;
27 }
28
29 static int ipip_init_state(struct xfrm_state *x)
30 {
31         if (x->props.mode != XFRM_MODE_TUNNEL)
32                 return -EINVAL;
33
34         if (x->encap)
35                 return -EINVAL;
36
37         x->props.header_len = sizeof(struct iphdr);
38
39         return 0;
40 }
41
42 static void ipip_destroy(struct xfrm_state *x)
43 {
44 }
45
46 static struct xfrm_type ipip_type = {
47         .description    = "IPIP",
48         .owner          = THIS_MODULE,
49         .proto          = IPPROTO_IPIP,
50         .init_state     = ipip_init_state,
51         .destructor     = ipip_destroy,
52         .input          = ipip_xfrm_rcv,
53         .output         = ipip_output
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        =       xfrm4_rcv,
63         .err_handler    =       xfrm_tunnel_err,
64         .priority       =       2,
65 };
66
67 static int __init ipip_init(void)
68 {
69         if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
70                 printk(KERN_INFO "ipip init: can't add xfrm type\n");
71                 return -EAGAIN;
72         }
73         if (xfrm4_tunnel_register(&xfrm_tunnel_handler)) {
74                 printk(KERN_INFO "ipip init: can't add xfrm handler\n");
75                 xfrm_unregister_type(&ipip_type, AF_INET);
76                 return -EAGAIN;
77         }
78         return 0;
79 }
80
81 static void __exit ipip_fini(void)
82 {
83         if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler))
84                 printk(KERN_INFO "ipip close: can't remove xfrm handler\n");
85         if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
86                 printk(KERN_INFO "ipip close: can't remove xfrm type\n");
87 }
88
89 module_init(ipip_init);
90 module_exit(ipip_fini);
91 MODULE_LICENSE("GPL");