1 files changed, 86 insertions, 0 deletions
diff --git a/arch/um/os-Linux/drivers/tuntap_kern.c b/arch/um/os-Linux/drivers/tuntap_kern.c
new file mode 100644
index 0000000000..adcb6717be
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_kern.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <asm/errno.h>
+#include <net_kern.h>
+#include "tuntap.h"
+
+struct tuntap_init {
+	char *dev_name;
+	char *gate_addr;
+};
+
+static void tuntap_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct tuntap_data *tpri;
+	struct tuntap_init *init = data;
+
+	pri = netdev_priv(dev);
+	tpri = (struct tuntap_data *) pri->user;
+	tpri->dev_name = init->dev_name;
+	tpri->fixed_config = (init->dev_name != NULL);
+	tpri->gate_addr = init->gate_addr;
+	tpri->fd = -1;
+	tpri->dev = dev;
+
+	printk(KERN_INFO "TUN/TAP backend - ");
+	if (tpri->gate_addr != NULL)
+		printk(KERN_CONT "IP = %s", tpri->gate_addr);
+	printk(KERN_CONT "\n");
+}
+
+static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+	return net_read(fd, skb_mac_header(skb),
+			skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+	return net_write(fd, skb->data, skb->len);
+}
+
+const struct net_kern_info tuntap_kern_info = {
+	.init			= tuntap_init,
+	.protocol		= eth_protocol,
+	.read			= tuntap_read,
+	.write 			= tuntap_write,
+};
+
+int tuntap_setup(char *str, char **mac_out, void *data)
+{
+	struct tuntap_init *init = data;
+
+	*init = ((struct tuntap_init)
+		{ .dev_name 	= NULL,
+		  .gate_addr 	= NULL });
+	if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
+			    &init->gate_addr))
+		return 0;
+
+	return 1;
+}
+
+static struct transport tuntap_transport = {
+	.list 		= LIST_HEAD_INIT(tuntap_transport.list),
+	.name 		= "tuntap",
+	.setup  	= tuntap_setup,
+	.user 		= &tuntap_user_info,
+	.kern 		= &tuntap_kern_info,
+	.private_size 	= sizeof(struct tuntap_data),
+	.setup_size 	= sizeof(struct tuntap_init),
+};
+
+static int register_tuntap(void)
+{
+	register_transport(&tuntap_transport);
+	return 0;
+}
+
+late_initcall(register_tuntap);