[NET]: Change 1500 to ETH_DATA_LEN in some files

These patches add the header linux/if_ether.h and change 1500 to
ETH_DATA_LEN in some files.

Signed-off-by: Kris Katterjohn <kjak@users.sourceforge.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index caa3b7d..9a5c0ce 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -49,6 +49,7 @@
 #include <linux/seq_file.h>
 #include <linux/mroute.h>
 #include <linux/init.h>
+#include <linux/if_ether.h>
 #include <net/ip.h>
 #include <net/protocol.h>
 #include <linux/skbuff.h>
@@ -193,7 +194,7 @@
 static void reg_vif_setup(struct net_device *dev)
 {
 	dev->type		= ARPHRD_PIMREG;
-	dev->mtu		= 1500 - sizeof(struct iphdr) - 8;
+	dev->mtu		= ETH_DATA_LEN - sizeof(struct iphdr) - 8;
 	dev->flags		= IFF_NOARP;
 	dev->hard_start_xmit	= reg_vif_xmit;
 	dev->get_stats		= reg_vif_get_stats;