2 * xfrm4_mode_transport.c - Transport mode encapsulation for IPv4.
4 * Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
7 #include <linux/init.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/skbuff.h>
11 #include <linux/stringify.h>
16 /* Add encapsulation header.
18 * The IP header will be moved forward to make space for the encapsulation
21 * On exit, skb->h will be set to the start of the payload to be processed
22 * by x->type->output and skb->nh will be set to the top IP header.
24 static int xfrm4_transport_output(struct sk_buff *skb)
37 skb->nh.raw = memmove(skb_push(skb, x->props.header_len), iph, ihl);
41 static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
46 static struct xfrm_mode xfrm4_transport_mode = {
47 .input = xfrm4_transport_input,
48 .output = xfrm4_transport_output,
50 .encap = XFRM_MODE_TRANSPORT,
53 static int __init xfrm4_transport_init(void)
55 return xfrm_register_mode(&xfrm4_transport_mode, AF_INET);
58 static void __exit xfrm4_transport_exit(void)
62 err = xfrm_unregister_mode(&xfrm4_transport_mode, AF_INET);
66 module_init(xfrm4_transport_init);
67 module_exit(xfrm4_transport_exit);
68 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_XFRM_MODE(AF_INET, XFRM_MODE_TRANSPORT);