-extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
-extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
-extern int inet_add_offload(const struct net_offload *prot, unsigned char num);
-extern int inet_del_offload(const struct net_offload *prot, unsigned char num);
-extern void inet_register_protosw(struct inet_protosw *p);
-extern void inet_unregister_protosw(struct inet_protosw *p);
+int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
+int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
+int inet_add_offload(const struct net_offload *prot, unsigned char num);
+int inet_del_offload(const struct net_offload *prot, unsigned char num);
+void inet_register_protosw(struct inet_protosw *p);
+void inet_unregister_protosw(struct inet_protosw *p);