diff --git a/include/linux/hook_frame.h b/include/linux/hook_frame.h
index a5c4ffd972cb677035d71c0d95b0d950d013cf31..d1c30afd0d56802eff96c83c1831d94c9defc4d8 100644
--- a/include/linux/hook_frame.h
+++ b/include/linux/hook_frame.h
@@ -1,9 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __HOOK_FRAME_H__
 #define  __HOOK_FRAME_H__
 
 #include<linux/net.h>
 #include<linux/socket.h>
 #include<linux/fs.h>
+#include<linux/kref.h>
 
 #define SYSCTL_SET_MAGIC        (0x5a5a5a5aUL << 32)
 
@@ -45,6 +47,8 @@ extern void (*get_exit_info_func)(struct task_struct *tsk, long code);
 
 extern long hookinfo_nr(void);
 
+extern void data_release(struct kref *ref);
+
 extern void sock_hook_check(void *sk);
 extern void recvfrom_hook_check(struct socket *sock, int fd, struct sockaddr_storage *address, int err);
 extern void sendto_hook_check(struct socket *sock, int fd, struct sockaddr_storage *address, int err);