Index: linux-3.10.14/net/nat/hw_nat/ra_nat.h
===================================================================
--- linux-3.10.14.orig/net/nat/hw_nat/ra_nat.h
+++ linux-3.10.14/net/nat/hw_nat/ra_nat.h
@@ -223,18 +223,12 @@ typedef struct {
 #define FOE_MAGIC_PPE		    0x7276
 
 /* choose one of them to keep HNAT related information in somewhere. */
-#if defined (CONFIG_SUPPORT_OPENWRT)
-//#define HNAT_USE_HEADROOM
-//#define HNAT_USE_TAILROOM
-#define HNAT_USE_SKB_CB
-#else
 //#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)) && defined (CONFIG_MT7621_ASIC)
 //#define HNAT_USE_TAILROOM
 //#else
 #define HNAT_USE_HEADROOM
 //#endif
 //#define HNAT_USE_SKB_CB
-#endif
 
 #if defined (HNAT_USE_HEADROOM)
 #define IS_SPACE_AVAILABLED(skb)    ((skb_headroom(skb) >= FOE_INFO_LEN) ? 1 : 0)
@@ -287,7 +281,7 @@ typedef struct {
 
 #elif defined (HNAT_USE_SKB_CB)
 //change the position of skb_CB if necessary
-#define CB_OFFSET		    32
+#define CB_OFFSET		    42
 #define IS_SPACE_AVAILABLED(skb)    1
 #define FOE_INFO_START_ADDR(skb)    (skb->cb +  CB_OFFSET)