diff --git a/libc/kernel/uapi/linux/hdlc/ioctl.h b/libc/kernel/uapi/linux/hdlc/ioctl.h
new file mode 100644
index 0000000..c47d91e
--- /dev/null
+++ b/libc/kernel/uapi/linux/hdlc/ioctl.h
@@ -0,0 +1,99 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef __HDLC_IOCTL_H__
+#define __HDLC_IOCTL_H__
+#define GENERIC_HDLC_VERSION 4
+#define CLOCK_DEFAULT 0
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define CLOCK_EXT 1
+#define CLOCK_INT 2
+#define CLOCK_TXINT 3
+#define CLOCK_TXFROMRX 4
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ENCODING_DEFAULT 0
+#define ENCODING_NRZ 1
+#define ENCODING_NRZI 2
+#define ENCODING_FM_MARK 3
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define ENCODING_FM_SPACE 4
+#define ENCODING_MANCHESTER 5
+#define PARITY_DEFAULT 0
+#define PARITY_NONE 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PARITY_CRC16_PR0 2
+#define PARITY_CRC16_PR1 3
+#define PARITY_CRC16_PR0_CCITT 4
+#define PARITY_CRC16_PR1_CCITT 5
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PARITY_CRC32_PR0_CCITT 6
+#define PARITY_CRC32_PR1_CCITT 7
+#define LMI_DEFAULT 0
+#define LMI_NONE 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define LMI_ANSI 2
+#define LMI_CCITT 3
+#define LMI_CISCO 4
+#ifndef __ASSEMBLY__
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+typedef struct {
+ unsigned int clock_rate;
+ unsigned int clock_type;
+ unsigned short loopback;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+} sync_serial_settings;
+typedef struct {
+ unsigned int clock_rate;
+ unsigned int clock_type;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned short loopback;
+ unsigned int slot_map;
+} te1_settings;
+typedef struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned short encoding;
+ unsigned short parity;
+} raw_hdlc_proto;
+typedef struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned int t391;
+ unsigned int t392;
+ unsigned int n391;
+ unsigned int n392;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned int n393;
+ unsigned short lmi;
+ unsigned short dce;
+} fr_proto;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+typedef struct {
+ unsigned int dlci;
+} fr_proto_pvc;
+typedef struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned int dlci;
+ char master[IFNAMSIZ];
+}fr_proto_pvc_info;
+typedef struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ unsigned int interval;
+ unsigned int timeout;
+} cisco_proto;
+#endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif