[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>

2 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index 112a21d0c6da..76f0cf66f95c 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -102,7 +102,7 @@ ip6t_local_out_hook(unsigned int hook,
 #if 0
         /* root is playing with raw sockets. */
         if ((*pskb)->len < sizeof(struct iphdr)
-            || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+            || ip_hdrlen(*pskb) < sizeof(struct iphdr)) {
                 if (net_ratelimit())
                         printk("ip6t_hook: happy cracking.\n");
                 return NF_ACCEPT;
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index 0c468d35a937..da2c1994539b 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -138,7 +138,7 @@ ip6t_local_hook(unsigned int hook,
 #if 0
         /* root is playing with raw sockets. */
         if ((*pskb)->len < sizeof(struct iphdr)
-            || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr)) {
+            || ip_hdrlen(*pskb) < sizeof(struct iphdr)) {
                 if (net_ratelimit())
                         printk("ip6t_hook: happy cracking.\n");
                 return NF_ACCEPT;