114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
|
/* xfrm4_tunnel.c: Generic IP tunnel transformer.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2003 David S. Miller (davem@redhat.com)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/skbuff.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <net/xfrm.h>
|
||
|
|
#include <net/ip.h>
|
||
|
|
#include <net/protocol.h>
|
||
|
|
|
||
|
|
static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
skb_push(skb, -skb_network_offset(skb));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
return ip_hdr(skb)->protocol;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ipip_init_state(struct xfrm_state *x)
|
||
|
|
{
|
||
|
|
if (x->props.mode != XFRM_MODE_TUNNEL)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (x->encap)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
x->props.header_len = sizeof(struct iphdr);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ipip_destroy(struct xfrm_state *x)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct xfrm_type ipip_type = {
|
||
|
|
.description = "IPIP",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.proto = IPPROTO_IPIP,
|
||
|
|
.init_state = ipip_init_state,
|
||
|
|
.destructor = ipip_destroy,
|
||
|
|
.input = ipip_xfrm_rcv,
|
||
|
|
.output = ipip_output
|
||
|
|
};
|
||
|
|
|
||
|
|
static int xfrm_tunnel_rcv(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
|
||
|
|
{
|
||
|
|
return -ENOENT;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct xfrm_tunnel xfrm_tunnel_handler = {
|
||
|
|
.handler = xfrm_tunnel_rcv,
|
||
|
|
.err_handler = xfrm_tunnel_err,
|
||
|
|
.priority = 2,
|
||
|
|
};
|
||
|
|
|
||
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
||
|
|
static struct xfrm_tunnel xfrm64_tunnel_handler = {
|
||
|
|
.handler = xfrm_tunnel_rcv,
|
||
|
|
.err_handler = xfrm_tunnel_err,
|
||
|
|
.priority = 2,
|
||
|
|
};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int __init ipip_init(void)
|
||
|
|
{
|
||
|
|
if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
|
||
|
|
printk(KERN_INFO "ipip init: can't add xfrm type\n");
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
|
||
|
|
printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET\n");
|
||
|
|
xfrm_unregister_type(&ipip_type, AF_INET);
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|
||
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
||
|
|
if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
|
||
|
|
printk(KERN_INFO "ipip init: can't add xfrm handler for AF_INET6\n");
|
||
|
|
xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
|
||
|
|
xfrm_unregister_type(&ipip_type, AF_INET);
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit ipip_fini(void)
|
||
|
|
{
|
||
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
||
|
|
if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
|
||
|
|
printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET6\n");
|
||
|
|
#endif
|
||
|
|
if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
|
||
|
|
printk(KERN_INFO "ipip close: can't remove xfrm handler for AF_INET\n");
|
||
|
|
if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
|
||
|
|
printk(KERN_INFO "ipip close: can't remove xfrm type\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(ipip_init);
|
||
|
|
module_exit(ipip_fini);
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);
|