1 files changed, 95 insertions, 0 deletions
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
new file mode 100644
index 000000000..fd2402669
--- /dev/null
+++ b/arch/um/drivers/daemon_kern.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ */
+
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <net_kern.h>
+#include "daemon.h"
+
+struct daemon_init {
+	char *sock_type;
+	char *ctl_sock;
+};
+
+static void daemon_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct daemon_data *dpri;
+	struct daemon_init *init = data;
+
+	pri = netdev_priv(dev);
+	dpri = (struct daemon_data *) pri->user;
+	dpri->sock_type = init->sock_type;
+	dpri->ctl_sock = init->ctl_sock;
+	dpri->fd = -1;
+	dpri->control = -1;
+	dpri->dev = dev;
+	/* We will free this pointer. If it contains crap we're burned. */
+	dpri->ctl_addr = NULL;
+	dpri->data_addr = NULL;
+	dpri->local_addr = NULL;
+
+	printk("daemon backend (uml_switch version %d) - %s:%s",
+	       SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
+	printk("\n");
+}
+
+static int daemon_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+	return net_recvfrom(fd, skb_mac_header(skb),
+			    skb->dev->mtu + ETH_HEADER_OTHER);
+}
+
+static int daemon_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
+{
+	return daemon_user_write(fd, skb->data, skb->len,
+				 (struct daemon_data *) &lp->user);
+}
+
+static const struct net_kern_info daemon_kern_info = {
+	.init			= daemon_init,
+	.protocol		= eth_protocol,
+	.read			= daemon_read,
+	.write			= daemon_write,
+};
+
+static int daemon_setup(char *str, char **mac_out, void *data)
+{
+	struct daemon_init *init = data;
+	char *remain;
+
+	*init = ((struct daemon_init)
+		{ .sock_type 		= "unix",
+		  .ctl_sock 		= "/tmp/uml.ctl" });
+
+	remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
+			       NULL);
+	if (remain != NULL)
+		printk(KERN_WARNING "daemon_setup : Ignoring data socket "
+		       "specification\n");
+
+	return 1;
+}
+
+static struct transport daemon_transport = {
+	.list 		= LIST_HEAD_INIT(daemon_transport.list),
+	.name 		= "daemon",
+	.setup  	= daemon_setup,
+	.user 		= &daemon_user_info,
+	.kern 		= &daemon_kern_info,
+	.private_size 	= sizeof(struct daemon_data),
+	.setup_size 	= sizeof(struct daemon_init),
+};
+
+static int register_daemon(void)
+{
+	register_transport(&daemon_transport);
+	return 0;
+}
+
+late_initcall(register_daemon);