[IP]: Introduce ip_hdrlen()

For the common sequence "skb->nh.iph->ihl * 4", removing a good number of open
coded skb->nh.iph uses, now to go after the rest...

Just out of curiosity, here are the idioms found to get the same result:

skb->nh.iph->ihl << 2
skb->nh.iph->ihl<<2
skb->nh.iph->ihl * 4
skb->nh.iph->ihl*4
(skb->nh.iph)->ihl * sizeof(u32)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 268a6c7347f..af120b2d533 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -483,7 +483,7 @@ static void ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
         flags = offset & ~IP_OFFSET;
         offset &= IP_OFFSET;
         offset <<= 3;           /* offset is in 8-byte chunks */
-        ihl = skb->nh.iph->ihl * 4;
+        ihl = ip_hdrlen(skb);
 
         /* Determine the position of this fragment. */
         end = offset + skb->len - ihl;
@@ -624,7 +624,7 @@ static struct sk_buff *ip_frag_reasm(struct ipq *qp, struct net_device *dev)
         BUG_TRAP(FRAG_CB(head)->offset == 0);
 
         /* Allocate a new buffer for the datagram. */
-        ihlen = head->nh.iph->ihl*4;
+        ihlen = ip_hdrlen(head);
         len = ihlen + qp->len;
 
         if (len > 65535)