-u32 flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
-int flow_copy_from_user(struct sw_flow_key *, const struct nlattr __user *ukey, u32 key_len);
-int flow_copy_to_user(struct nlattr __user *ukey, const struct sw_flow_key *, u32 key_len);
+int flow_to_nlattrs(const struct sw_flow_key *, struct sk_buff *);
+int flow_from_nlattrs(struct sw_flow_key *swkey, const struct nlattr *);