v4.19.13 snapshot.
diff --git a/include/linux/lapb.h b/include/linux/lapb.h
new file mode 100644
index 0000000..eb56472
--- /dev/null
+++ b/include/linux/lapb.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * These are the public elements of the Linux LAPB module.
+ */
+
+#ifndef LAPB_KERNEL_H
+#define LAPB_KERNEL_H
+
+#define LAPB_OK 0
+#define LAPB_BADTOKEN 1
+#define LAPB_INVALUE 2
+#define LAPB_CONNECTED 3
+#define LAPB_NOTCONNECTED 4
+#define LAPB_REFUSED 5
+#define LAPB_TIMEDOUT 6
+#define LAPB_NOMEM 7
+
+#define LAPB_STANDARD 0x00
+#define LAPB_EXTENDED 0x01
+
+#define LAPB_SLP 0x00
+#define LAPB_MLP 0x02
+
+#define LAPB_DTE 0x00
+#define LAPB_DCE 0x04
+
+struct lapb_register_struct {
+ void (*connect_confirmation)(struct net_device *dev, int reason);
+ void (*connect_indication)(struct net_device *dev, int reason);
+ void (*disconnect_confirmation)(struct net_device *dev, int reason);
+ void (*disconnect_indication)(struct net_device *dev, int reason);
+ int (*data_indication)(struct net_device *dev, struct sk_buff *skb);
+ void (*data_transmit)(struct net_device *dev, struct sk_buff *skb);
+};
+
+struct lapb_parms_struct {
+ unsigned int t1;
+ unsigned int t1timer;
+ unsigned int t2;
+ unsigned int t2timer;
+ unsigned int n2;
+ unsigned int n2count;
+ unsigned int window;
+ unsigned int state;
+ unsigned int mode;
+};
+
+extern int lapb_register(struct net_device *dev,
+ const struct lapb_register_struct *callbacks);
+extern int lapb_unregister(struct net_device *dev);
+extern int lapb_getparms(struct net_device *dev, struct lapb_parms_struct *parms);
+extern int lapb_setparms(struct net_device *dev, struct lapb_parms_struct *parms);
+extern int lapb_connect_request(struct net_device *dev);
+extern int lapb_disconnect_request(struct net_device *dev);
+extern int lapb_data_request(struct net_device *dev, struct sk_buff *skb);
+extern int lapb_data_received(struct net_device *dev, struct sk_buff *skb);
+
+#endif