diff --git a/include/net/sock.h b/include/net/sock.h
index d594288..1418388 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1370,4 +1370,16 @@
 }
 #endif
 
+extern void sk_init(void);
+
+#ifdef CONFIG_SYSCTL
+extern struct ctl_table core_table[];
+extern int sysctl_optmem_max;
+#endif
+
+#ifdef CONFIG_PROC_FS
+extern __u32 sysctl_wmem_default;
+extern __u32 sysctl_rmem_default;
+#endif
+
 #endif	/* _SOCK_H */