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[IPSEC]: Use IPv6 calling convention as the convention for x->mode->output

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The IPv6 calling convention for x->mode->output is more general and could
help an eventual protocol-generic x->type->output implementation.  This
patch adopts it for IPv4 as well and modifies the IPv4 type output functions
accordingly.

It also rewrites the IPv6 mac/transport header calculation to be based off
the network header where practical.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2007-10-10 15:44:44 -07:00
committed by David S. Miller
parent 7b277b1a5f
commit 37fedd3aab
11 changed files with 44 additions and 67 deletions
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9
net/ipv6/xfrm6_mode_ro.c
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@@ -37,13 +37,6 @@
*
* The IP header and mutable extension headers will be moved forward to make
* space for the route optimization header.
*
* On exit, skb->h will be set to the start of the encapsulation header to be
* filled in by x->type->output and the mac header 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 the network header will always point to the top IP header
* while skb->data will point to the payload.
*/
static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
{
@@ -56,7 +49,7 @@ static int xfrm6_ro_output(struct xfrm_state *x, struct sk_buff *skb)
hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
skb_set_network_header(skb, -x->props.header_len);
skb_set_transport_header(skb, hdr_len - x->props.header_len);
skb->transport_header = skb->network_header + hdr_len;
__skb_pull(skb, hdr_len);
memmove(ipv6_hdr(skb), iph, hdr_len);