commit c9bdd4b5257406b0608385d19c40b5511decf4f6

Author: Arnaldo Carvalho de Melo <acme@redhat.com>
Date:   Mon Mar 12 20:09:15 2007 -0300

    [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>
Edited: Ian Campbell -- just definition.

diff --git a/include/net/ip.h b/include/net/ip.h
index 98f90840077186243bf910db40452ba7cfa881d9..a51042e49269c0e8e759b3a624c724b21be498ad 100644 (file)
--- 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 @@ struct inet_skb_parm
 #define IPSKB_REROUTED         16
 };
 
+static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
+{
+       return skb->nh.iph->ihl * 4;
+}
+
 struct ipcm_cookie
 {
        u32                     addr;
@@ -74,7 +80,6 @@ struct msghdr;
 struct net_device;
 struct packet_type;
 struct rtable;
-struct sk_buff;
 struct sockaddr;
 
 extern void            ip_mc_dropsocket(struct sock *);