1 /* xfrm4_tunnel.c: Generic IP tunnel transformer.
3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
6 #include <linux/skbuff.h>
9 #include <net/protocol.h>
11 static int ipip_output(struct sk_buff **pskb)
13 struct sk_buff *skb = *pskb;
17 iph->tot_len = htons(skb->len);
23 static int ipip_xfrm_rcv(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
28 static struct xfrm_tunnel *ipip_handler;
29 static DECLARE_MUTEX(xfrm4_tunnel_sem);
31 int xfrm4_tunnel_register(struct xfrm_tunnel *handler)
35 down(&xfrm4_tunnel_sem);
37 if (ipip_handler != NULL)
40 ipip_handler = handler;
41 up(&xfrm4_tunnel_sem);
46 int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler)
50 down(&xfrm4_tunnel_sem);
52 if (ipip_handler != handler)
56 up(&xfrm4_tunnel_sem);
63 static int ipip_rcv(struct sk_buff *skb)
65 struct xfrm_tunnel *handler = ipip_handler;
67 /* Tunnel devices take precedence. */
68 if (handler && handler->handler(skb) == 0)
71 return xfrm4_rcv_encap(skb, 0);
74 static void ipip_err(struct sk_buff *skb, u32 info)
76 struct xfrm_tunnel *handler = ipip_handler;
80 handler->err_handler(skb, &arg);
83 static int ipip_init_state(struct xfrm_state *x, void *args)
87 x->props.header_len = sizeof(struct iphdr);
92 static void ipip_destroy(struct xfrm_state *x)
96 static struct xfrm_type ipip_type = {
97 .description = "IPIP",
99 .proto = IPPROTO_IPIP,
100 .init_state = ipip_init_state,
101 .destructor = ipip_destroy,
102 .input = ipip_xfrm_rcv,
103 .output = ipip_output
106 static struct net_protocol ipip_protocol = {
108 .err_handler = ipip_err,
112 static int __init ipip_init(void)
114 if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
115 printk(KERN_INFO "ipip init: can't add xfrm type\n");
118 if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) {
119 printk(KERN_INFO "ipip init: can't add protocol\n");
120 xfrm_unregister_type(&ipip_type, AF_INET);
126 static void __exit ipip_fini(void)
128 if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0)
129 printk(KERN_INFO "ipip close: can't remove protocol\n");
130 if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
131 printk(KERN_INFO "ipip close: can't remove xfrm type\n");
134 module_init(ipip_init);
135 module_exit(ipip_fini);
136 MODULE_LICENSE("GPL");