forked from luck/tmp_suning_uos_patched
b0e380b1d8
Renaming skb->h to skb->transport_header, skb->nh to skb->network_header and
skb->mac to skb->mac_header, to match the names of the associated helpers
(skb[_[re]set]_{transport,network,mac}_header).
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
|
|
* xfrm6_mode_transport.c - Transport mode encapsulation for IPv6.
|
|
*
|
|
* Copyright (C) 2002 USAGI/WIDE Project
|
|
* Copyright (c) 2004-2006 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/stringify.h>
|
|
#include <net/dst.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
/* Add encapsulation header.
|
|
*
|
|
* The IP header and mutable extension headers will be moved forward to make
|
|
* space for the encapsulation header.
|
|
*
|
|
* On exit, skb->h will be set to the start of the encapsulation header to be
|
|
* filled in by x->type->output and skb->nh will be set to the nextheader field
|
|
* of the extension header directly preceding the encapsulation header, or in
|
|
* its absence, that of the top IP header. The value of skb->data will always
|
|
* point to the top IP header.
|
|
*/
|
|
static int xfrm6_transport_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *iph;
|
|
u8 *prevhdr;
|
|
int hdr_len;
|
|
|
|
skb_push(skb, x->props.header_len);
|
|
iph = ipv6_hdr(skb);
|
|
|
|
hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
|
|
skb_set_network_header(skb,
|
|
(prevhdr - x->props.header_len) - skb->data);
|
|
skb_set_transport_header(skb, hdr_len);
|
|
memmove(skb->data, iph, hdr_len);
|
|
return 0;
|
|
}
|
|
|
|
/* Remove encapsulation header.
|
|
*
|
|
* The IP header will be moved over the top of the encapsulation header.
|
|
*
|
|
* On entry, skb->h shall point to where the IP header should be and skb->nh
|
|
* shall be set to where the IP header currently is. skb->data shall point
|
|
* to the start of the payload.
|
|
*/
|
|
static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
int ihl = skb->data - skb_transport_header(skb);
|
|
|
|
if (skb->transport_header != skb->network_header) {
|
|
memmove(skb_transport_header(skb),
|
|
skb_network_header(skb), ihl);
|
|
skb->network_header = skb->transport_header;
|
|
}
|
|
ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
|
|
sizeof(struct ipv6hdr));
|
|
skb_reset_transport_header(skb);
|
|
return 0;
|
|
}
|
|
|
|
static struct xfrm_mode xfrm6_transport_mode = {
|
|
.input = xfrm6_transport_input,
|
|
.output = xfrm6_transport_output,
|
|
.owner = THIS_MODULE,
|
|
.encap = XFRM_MODE_TRANSPORT,
|
|
};
|
|
|
|
static int __init xfrm6_transport_init(void)
|
|
{
|
|
return xfrm_register_mode(&xfrm6_transport_mode, AF_INET6);
|
|
}
|
|
|
|
static void __exit xfrm6_transport_exit(void)
|
|
{
|
|
int err;
|
|
|
|
err = xfrm_unregister_mode(&xfrm6_transport_mode, AF_INET6);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
module_init(xfrm6_transport_init);
|
|
module_exit(xfrm6_transport_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_XFRM_MODE(AF_INET6, XFRM_MODE_TRANSPORT);
|