[SK_BUFF]: Introduce ipv6_hdr(), remove skb->nh.ipv6h

Now the skb->nh union has just one member, .raw, i.e. it is just like the
skb->mac union, strange, no? I'm just leaving it like that till the transport
layer is done with, when we'll rename skb->mac.raw to skb->mac_header (or
->mac_header_offset?), ditto for ->{h,nh}.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index c324866..a3d9986 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2899,13 +2899,11 @@
 			cmd_length = E1000_TXD_CMD_IP;
 			ipcse = skb->h.raw - skb->data - 1;
 		} else if (skb->protocol == htons(ETH_P_IPV6)) {
-			skb->nh.ipv6h->payload_len = 0;
+			ipv6_hdr(skb)->payload_len = 0;
 			skb->h.th->check =
-				~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
-						 &skb->nh.ipv6h->daddr,
-						 0,
-						 IPPROTO_TCP,
-						 0);
+				~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+						 &ipv6_hdr(skb)->daddr,
+						 0, IPPROTO_TCP, 0);
 			ipcse = 0;
 		}
 		ipcss = skb_network_offset(skb);