1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/if_tun.h b/include/linux/if_tun.h
new file mode 100644
index 000000000..2a7660843
--- /dev/null
+++ b/include/linux/if_tun.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  Universal TUN/TAP device driver.
+ *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
+ */
+#ifndef __IF_TUN_H
+#define __IF_TUN_H
+
+#include <uapi/linux/if_tun.h>
+#include <uapi/linux/virtio_net.h>
+
+#define TUN_XDP_FLAG 0x1UL
+
+#define TUN_MSG_UBUF 1
+#define TUN_MSG_PTR  2
+struct tun_msg_ctl {
+	unsigned short type;
+	unsigned short num;
+	void *ptr;
+};
+
+struct tun_xdp_hdr {
+	int buflen;
+	struct virtio_net_hdr gso;
+};
+
+#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
+struct socket *tun_get_socket(struct file *);
+struct ptr_ring *tun_get_tx_ring(struct file *file);
+static inline bool tun_is_xdp_frame(void *ptr)
+{
+       return (unsigned long)ptr & TUN_XDP_FLAG;
+}
+static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
+{
+       return (void *)((unsigned long)xdp | TUN_XDP_FLAG);
+}
+static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
+{
+       return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
+}
+void tun_ptr_free(void *ptr);
+#else
+#include <linux/err.h>
+#include <linux/errno.h>
+struct file;
+struct socket;
+static inline struct socket *tun_get_socket(struct file *f)
+{
+	return ERR_PTR(-EINVAL);
+}
+static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
+{
+	return ERR_PTR(-EINVAL);
+}
+static inline bool tun_is_xdp_frame(void *ptr)
+{
+	return false;
+}
+static inline void *tun_xdp_to_ptr(struct xdp_frame *xdp)
+{
+	return NULL;
+}
+static inline struct xdp_frame *tun_ptr_to_xdp(void *ptr)
+{
+	return NULL;
+}
+static inline void tun_ptr_free(void *ptr)
+{
+}
+#endif /* CONFIG_TUN */
+#endif /* __IF_TUN_H */