-extern int ip_route_me_harder(struct sk_buff **pskb, unsigned addr_type);
-extern int ip_xfrm_me_harder(struct sk_buff **pskb);
-extern unsigned int nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
+extern int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type);
+extern int ip_xfrm_me_harder(struct sk_buff *skb);
+extern __sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,