--- /dev/null
+/*
+ * Universal TUN/TAP device driver.
+ * Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * $Id: if_tun.h,v 1.5 2000/10/24 05:13:08 maxk Exp $
+ */
+
+#ifndef __IF_TUN_H
+#define __IF_TUN_H
+
+/* Uncomment to enable debugging */
+/* #define TUN_DEBUG 1 */
+
+#ifdef __KERNEL__
+
+#ifdef TUN_DEBUG
+#define DBG if(tun->debug)printk
+#define DBG1 if(debug==2)printk
+#else
+#define DBG( a... )
+#define DBG1( a... )
+#endif
+
+struct tun_struct {
+ char name[8];
+ unsigned long flags;
+
+ struct fasync_struct *fasync;
+ wait_queue_head_t read_wait;
+
+ struct net_device dev;
+ struct sk_buff_head txq;
+ struct net_device_stats stats;
+
+#ifdef TUN_DEBUG
+ int debug;
+#endif
+};
+
+#ifndef MIN
+#define MIN(a,b) ( (a)<(b) ? (a):(b) )
+#endif
+
+#endif /* __KERNEL__ */
+
+/* Number of devices */
+#define TUN_MAX_DEV 255
+
+/* TX queue size */
+#define TUN_TXQ_SIZE 10
+
+/* Max frame size */
+#define TUN_MAX_FRAME 4096
+
+/* TUN device flags */
+#define TUN_TUN_DEV 0x0001
+#define TUN_TAP_DEV 0x0002
+#define TUN_TYPE_MASK 0x000f
+
+#define TUN_FASYNC 0x0010
+#define TUN_NOCHECKSUM 0x0020
+#define TUN_NO_PI 0x0040
+
+#define TUN_IFF_SET 0x1000
+
+/* Ioctl defines */
+#define TUNSETNOCSUM (('T'<< 8) | 200)
+#define TUNSETDEBUG (('T'<< 8) | 201)
+#define TUNSETIFF (('T'<< 8) | 202)
+
+/* TUNSETIFF ifr flags */
+#define IFF_TUN 0x0001
+#define IFF_TAP 0x0002
+#define IFF_NO_PI 0x1000
+
+struct tun_pi {
+ unsigned short flags;
+ unsigned short proto;
+};
+#define TUN_PKT_STRIP 0x0001
+
+#endif /* __IF_TUN_H */