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-rw-r--r--arch/um/drivers/vde_user.c125
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/um/drivers/vde_user.c b/arch/um/drivers/vde_user.c
new file mode 100644
index 000000000..bc7dc4e1e
--- /dev/null
+++ b/arch/um/drivers/vde_user.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include <libvdeplug.h>
+#include <net_user.h>
+#include <um_malloc.h>
+#include "vde.h"
+
+static int vde_user_init(void *data, void *dev)
+{
+ struct vde_data *pri = data;
+ VDECONN *conn = NULL;
+ int err = -EINVAL;
+
+ pri->dev = dev;
+
+ conn = vde_open(pri->vde_switch, pri->descr, pri->args);
+
+ if (conn == NULL) {
+ err = -errno;
+ printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
+ "errno = %d\n", errno);
+ return err;
+ }
+
+ printk(UM_KERN_INFO "vde backend - connection opened\n");
+
+ pri->conn = conn;
+
+ return 0;
+}
+
+static int vde_user_open(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL)
+ return vde_datafd(pri->conn);
+
+ printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
+ return -EINVAL;
+}
+
+static void vde_remove(void *data)
+{
+ struct vde_data *pri = data;
+
+ if (pri->conn != NULL) {
+ printk(UM_KERN_INFO "vde backend - closing connection\n");
+ vde_close(pri->conn);
+ pri->conn = NULL;
+ kfree(pri->args);
+ pri->args = NULL;
+ return;
+ }
+
+ printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
+}
+
+const struct net_user_info vde_user_info = {
+ .init = vde_user_init,
+ .open = vde_user_open,
+ .close = NULL,
+ .remove = vde_remove,
+ .add_address = NULL,
+ .delete_address = NULL,
+ .mtu = ETH_MAX_PACKET,
+ .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
+};
+
+void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
+{
+ struct vde_open_args *args;
+
+ vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
+ if (vpri->args == NULL) {
+ printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
+ "allocation failed");
+ return;
+ }
+
+ args = vpri->args;
+
+ args->port = init->port;
+ args->group = init->group;
+ args->mode = init->mode ? init->mode : 0700;
+
+ args->port ? printk("port %d", args->port) :
+ printk("undefined port");
+}
+
+int vde_user_read(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+ int rv;
+
+ if (vconn == NULL)
+ return 0;
+
+ rv = vde_recv(vconn, buf, len, 0);
+ if (rv < 0) {
+ if (errno == EAGAIN)
+ return 0;
+ return -errno;
+ }
+ else if (rv == 0)
+ return -ENOTCONN;
+
+ return rv;
+}
+
+int vde_user_write(void *conn, void *buf, int len)
+{
+ VDECONN *vconn = conn;
+
+ if (vconn == NULL)
+ return 0;
+
+ return vde_send(vconn, buf, len, 0);
+}
+