ceb1eec829
This patch moves the setting of the IP length and checksum fields out of the transforms and into the xfrmX_output functions. This would help future efforts in merging the transforms themselves. It also adds an optimisation to ipcomp due to the fact that the transport offset is guaranteed to be zero. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
109 lines
2.6 KiB
C
109 lines
2.6 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 0;
|
|
}
|
|
|
|
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 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_err(struct sk_buff *skb, u32 info)
|
|
{
|
|
return -ENOENT;
|
|
}
|
|
|
|
static struct xfrm_tunnel xfrm_tunnel_handler = {
|
|
.handler = xfrm4_rcv,
|
|
.err_handler = xfrm_tunnel_err,
|
|
.priority = 2,
|
|
};
|
|
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
|
static struct xfrm_tunnel xfrm64_tunnel_handler = {
|
|
.handler = xfrm4_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);
|