extern unsigned long netdev_fc_xoff;
extern atomic_t netdev_dropping;
extern int netdev_set_master(struct net_device *dev, struct net_device *master);
-extern struct sk_buff * skb_checksum_help(struct sk_buff *skb);
+extern int skb_checksum_help(struct sk_buff **pskb, int inward);
#ifdef CONFIG_NET_FASTROUTE
extern int netdev_fastroute;
extern int netdev_fastroute_obstacles;