[IPSEC]: Store IPv6 nh pointer in mac_header on output

Current the x->mode->output functions store the IPv6 nh pointer in the
skb network header.  This is inconvenient because the network header then
has to be fixed up before the packet can leave the IPsec stack.  The mac
header field is unused on output so we can use that to store this instead.

This patch does that and removes the network header fix-up in xfrm_output.

It also uses ipv6_hdr where appropriate in the x->type->output functions.

There is also a minor clean-up in esp4 to make it use the same code as
esp6 to help any subsequent effort to merge the two.

Lastly it kills two redundant skb_set_* statements in BEET that were
simply copied over from transport mode.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 6 deletions

diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 8a1399ce38ce..7261c29898cb 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -153,11 +153,11 @@ static int mip6_destopt_output(struct xfrm_state *x, struct sk_buff *skb)
         u8 nexthdr;
         int len;
 
-        iph = (struct ipv6hdr *)skb->data;
+        iph = ipv6_hdr(skb);
         iph->payload_len = htons(skb->len - sizeof(*iph));
 
-        nexthdr = *skb_network_header(skb);
-        *skb_network_header(skb) = IPPROTO_DSTOPTS;
+        nexthdr = *skb_mac_header(skb);
+        *skb_mac_header(skb) = IPPROTO_DSTOPTS;
 
         dstopt = (struct ipv6_destopt_hdr *)skb_transport_header(skb);
         dstopt->nexthdr = nexthdr;
@@ -365,11 +365,11 @@ static int mip6_rthdr_output(struct xfrm_state *x, struct sk_buff *skb)
         struct rt2_hdr *rt2;
         u8 nexthdr;
 
-        iph = (struct ipv6hdr *)skb->data;
+        iph = ipv6_hdr(skb);
         iph->payload_len = htons(skb->len - sizeof(*iph));
 
-        nexthdr = *skb_network_header(skb);
-        *skb_network_header(skb) = IPPROTO_ROUTING;
+        nexthdr = *skb_mac_header(skb);
+        *skb_mac_header(skb) = IPPROTO_ROUTING;
 
         rt2 = (struct rt2_hdr *)skb_transport_header(skb);
         rt2->rt_hdr.nexthdr = nexthdr;