[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>
diff --git a/include/net/ip.h b/include/net/ip.h
index e79c3e3..6f7ba32 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -25,6 +25,7 @@
#include <linux/types.h>
#include <linux/ip.h>
#include <linux/in.h>
+#include <linux/skbuff.h>
#include <net/inet_sock.h>
#include <net/snmp.h>
@@ -43,6 +44,11 @@
#define IPSKB_REROUTED 16
};
+static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
+{
+ return skb->nh.iph->ihl * 4;
+}
+
struct ipcm_cookie
{
__be32 addr;
@@ -74,7 +80,6 @@
struct net_device;
struct packet_type;
struct rtable;
-struct sk_buff;
struct sockaddr;
extern void ip_mc_dropsocket(struct sock *);