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path: root/drivers/usb/usbip/vhci_sysfs.c
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Diffstat (limited to 'drivers/usb/usbip/vhci_sysfs.c')
-rw-r--r--drivers/usb/usbip/vhci_sysfs.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/drivers/usb/usbip/vhci_sysfs.c b/drivers/usb/usbip/vhci_sysfs.c
new file mode 100644
index 000000000..ebc7be1d9
--- /dev/null
+++ b/drivers/usb/usbip/vhci_sysfs.c
@@ -0,0 +1,526 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2003-2008 Takahiro Hirofuchi
+ * Copyright (C) 2015-2016 Nobuo Iwata
+ */
+
+#include <linux/kthread.h>
+#include <linux/file.h>
+#include <linux/net.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Hardening for Spectre-v1 */
+#include <linux/nospec.h>
+
+#include "usbip_common.h"
+#include "vhci.h"
+
+/* TODO: refine locking ?*/
+
+/*
+ * output example:
+ * hub port sta spd dev sockfd local_busid
+ * hs 0000 004 000 00000000 000003 1-2.3
+ * ................................................
+ * ss 0008 004 000 00000000 000004 2-3.4
+ * ................................................
+ *
+ * Output includes socket fd instead of socket pointer address to avoid
+ * leaking kernel memory address in:
+ * /sys/devices/platform/vhci_hcd.0/status and in debug output.
+ * The socket pointer address is not used at the moment and it was made
+ * visible as a convenient way to find IP address from socket pointer
+ * address by looking up /proc/net/{tcp,tcp6}. As this opens a security
+ * hole, the change is made to use sockfd instead.
+ *
+ */
+static void port_show_vhci(char **out, int hub, int port, struct vhci_device *vdev)
+{
+ if (hub == HUB_SPEED_HIGH)
+ *out += sprintf(*out, "hs %04u %03u ",
+ port, vdev->ud.status);
+ else /* hub == HUB_SPEED_SUPER */
+ *out += sprintf(*out, "ss %04u %03u ",
+ port, vdev->ud.status);
+
+ if (vdev->ud.status == VDEV_ST_USED) {
+ *out += sprintf(*out, "%03u %08x ",
+ vdev->speed, vdev->devid);
+ *out += sprintf(*out, "%06u %s",
+ vdev->ud.sockfd,
+ dev_name(&vdev->udev->dev));
+
+ } else {
+ *out += sprintf(*out, "000 00000000 ");
+ *out += sprintf(*out, "000000 0-0");
+ }
+
+ *out += sprintf(*out, "\n");
+}
+
+/* Sysfs entry to show port status */
+static ssize_t status_show_vhci(int pdev_nr, char *out)
+{
+ struct platform_device *pdev = vhcis[pdev_nr].pdev;
+ struct vhci *vhci;
+ struct usb_hcd *hcd;
+ struct vhci_hcd *vhci_hcd;
+ char *s = out;
+ int i;
+ unsigned long flags;
+
+ if (!pdev || !out) {
+ usbip_dbg_vhci_sysfs("show status error\n");
+ return 0;
+ }
+
+ hcd = platform_get_drvdata(pdev);
+ vhci_hcd = hcd_to_vhci_hcd(hcd);
+ vhci = vhci_hcd->vhci;
+
+ spin_lock_irqsave(&vhci->lock, flags);
+
+ for (i = 0; i < VHCI_HC_PORTS; i++) {
+ struct vhci_device *vdev = &vhci->vhci_hcd_hs->vdev[i];
+
+ spin_lock(&vdev->ud.lock);
+ port_show_vhci(&out, HUB_SPEED_HIGH,
+ pdev_nr * VHCI_PORTS + i, vdev);
+ spin_unlock(&vdev->ud.lock);
+ }
+
+ for (i = 0; i < VHCI_HC_PORTS; i++) {
+ struct vhci_device *vdev = &vhci->vhci_hcd_ss->vdev[i];
+
+ spin_lock(&vdev->ud.lock);
+ port_show_vhci(&out, HUB_SPEED_SUPER,
+ pdev_nr * VHCI_PORTS + VHCI_HC_PORTS + i, vdev);
+ spin_unlock(&vdev->ud.lock);
+ }
+
+ spin_unlock_irqrestore(&vhci->lock, flags);
+
+ return out - s;
+}
+
+static ssize_t status_show_not_ready(int pdev_nr, char *out)
+{
+ char *s = out;
+ int i = 0;
+
+ for (i = 0; i < VHCI_HC_PORTS; i++) {
+ out += sprintf(out, "hs %04u %03u ",
+ (pdev_nr * VHCI_PORTS) + i,
+ VDEV_ST_NOTASSIGNED);
+ out += sprintf(out, "000 00000000 0000000000000000 0-0");
+ out += sprintf(out, "\n");
+ }
+
+ for (i = 0; i < VHCI_HC_PORTS; i++) {
+ out += sprintf(out, "ss %04u %03u ",
+ (pdev_nr * VHCI_PORTS) + VHCI_HC_PORTS + i,
+ VDEV_ST_NOTASSIGNED);
+ out += sprintf(out, "000 00000000 0000000000000000 0-0");
+ out += sprintf(out, "\n");
+ }
+ return out - s;
+}
+
+static int status_name_to_id(const char *name)
+{
+ char *c;
+ long val;
+ int ret;
+
+ c = strchr(name, '.');
+ if (c == NULL)
+ return 0;
+
+ ret = kstrtol(c+1, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ return val;
+}
+
+static ssize_t status_show(struct device *dev,
+ struct device_attribute *attr, char *out)
+{
+ char *s = out;
+ int pdev_nr;
+
+ out += sprintf(out,
+ "hub port sta spd dev sockfd local_busid\n");
+
+ pdev_nr = status_name_to_id(attr->attr.name);
+ if (pdev_nr < 0)
+ out += status_show_not_ready(pdev_nr, out);
+ else
+ out += status_show_vhci(pdev_nr, out);
+
+ return out - s;
+}
+
+static ssize_t nports_show(struct device *dev, struct device_attribute *attr,
+ char *out)
+{
+ char *s = out;
+
+ /*
+ * Half the ports are for SPEED_HIGH and half for SPEED_SUPER,
+ * thus the * 2.
+ */
+ out += sprintf(out, "%d\n", VHCI_PORTS * vhci_num_controllers);
+ return out - s;
+}
+static DEVICE_ATTR_RO(nports);
+
+/* Sysfs entry to shutdown a virtual connection */
+static int vhci_port_disconnect(struct vhci_hcd *vhci_hcd, __u32 rhport)
+{
+ struct vhci_device *vdev = &vhci_hcd->vdev[rhport];
+ struct vhci *vhci = vhci_hcd->vhci;
+ unsigned long flags;
+
+ usbip_dbg_vhci_sysfs("enter\n");
+
+ mutex_lock(&vdev->ud.sysfs_lock);
+
+ /* lock */
+ spin_lock_irqsave(&vhci->lock, flags);
+ spin_lock(&vdev->ud.lock);
+
+ if (vdev->ud.status == VDEV_ST_NULL) {
+ pr_err("not connected %d\n", vdev->ud.status);
+
+ /* unlock */
+ spin_unlock(&vdev->ud.lock);
+ spin_unlock_irqrestore(&vhci->lock, flags);
+ mutex_unlock(&vdev->ud.sysfs_lock);
+
+ return -EINVAL;
+ }
+
+ /* unlock */
+ spin_unlock(&vdev->ud.lock);
+ spin_unlock_irqrestore(&vhci->lock, flags);
+
+ usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
+
+ mutex_unlock(&vdev->ud.sysfs_lock);
+
+ return 0;
+}
+
+static int valid_port(__u32 *pdev_nr, __u32 *rhport)
+{
+ if (*pdev_nr >= vhci_num_controllers) {
+ pr_err("pdev %u\n", *pdev_nr);
+ return 0;
+ }
+ *pdev_nr = array_index_nospec(*pdev_nr, vhci_num_controllers);
+
+ if (*rhport >= VHCI_HC_PORTS) {
+ pr_err("rhport %u\n", *rhport);
+ return 0;
+ }
+ *rhport = array_index_nospec(*rhport, VHCI_HC_PORTS);
+
+ return 1;
+}
+
+static ssize_t detach_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ __u32 port = 0, pdev_nr = 0, rhport = 0;
+ struct usb_hcd *hcd;
+ struct vhci_hcd *vhci_hcd;
+ int ret;
+
+ if (kstrtoint(buf, 10, &port) < 0)
+ return -EINVAL;
+
+ pdev_nr = port_to_pdev_nr(port);
+ rhport = port_to_rhport(port);
+
+ if (!valid_port(&pdev_nr, &rhport))
+ return -EINVAL;
+
+ hcd = platform_get_drvdata(vhcis[pdev_nr].pdev);
+ if (hcd == NULL) {
+ dev_err(dev, "port is not ready %u\n", port);
+ return -EAGAIN;
+ }
+
+ usbip_dbg_vhci_sysfs("rhport %d\n", rhport);
+
+ if ((port / VHCI_HC_PORTS) % 2)
+ vhci_hcd = hcd_to_vhci_hcd(hcd)->vhci->vhci_hcd_ss;
+ else
+ vhci_hcd = hcd_to_vhci_hcd(hcd)->vhci->vhci_hcd_hs;
+
+ ret = vhci_port_disconnect(vhci_hcd, rhport);
+ if (ret < 0)
+ return -EINVAL;
+
+ usbip_dbg_vhci_sysfs("Leave\n");
+
+ return count;
+}
+static DEVICE_ATTR_WO(detach);
+
+static int valid_args(__u32 *pdev_nr, __u32 *rhport,
+ enum usb_device_speed speed)
+{
+ if (!valid_port(pdev_nr, rhport)) {
+ return 0;
+ }
+
+ switch (speed) {
+ case USB_SPEED_LOW:
+ case USB_SPEED_FULL:
+ case USB_SPEED_HIGH:
+ case USB_SPEED_WIRELESS:
+ case USB_SPEED_SUPER:
+ break;
+ default:
+ pr_err("Failed attach request for unsupported USB speed: %s\n",
+ usb_speed_string(speed));
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Sysfs entry to establish a virtual connection */
+/*
+ * To start a new USB/IP attachment, a userland program needs to setup a TCP
+ * connection and then write its socket descriptor with remote device
+ * information into this sysfs file.
+ *
+ * A remote device is virtually attached to the root-hub port of @rhport with
+ * @speed. @devid is embedded into a request to specify the remote device in a
+ * server host.
+ *
+ * write() returns 0 on success, else negative errno.
+ */
+static ssize_t attach_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct socket *socket;
+ int sockfd = 0;
+ __u32 port = 0, pdev_nr = 0, rhport = 0, devid = 0, speed = 0;
+ struct usb_hcd *hcd;
+ struct vhci_hcd *vhci_hcd;
+ struct vhci_device *vdev;
+ struct vhci *vhci;
+ int err;
+ unsigned long flags;
+ struct task_struct *tcp_rx = NULL;
+ struct task_struct *tcp_tx = NULL;
+
+ /*
+ * @rhport: port number of vhci_hcd
+ * @sockfd: socket descriptor of an established TCP connection
+ * @devid: unique device identifier in a remote host
+ * @speed: usb device speed in a remote host
+ */
+ if (sscanf(buf, "%u %u %u %u", &port, &sockfd, &devid, &speed) != 4)
+ return -EINVAL;
+ pdev_nr = port_to_pdev_nr(port);
+ rhport = port_to_rhport(port);
+
+ usbip_dbg_vhci_sysfs("port(%u) pdev(%d) rhport(%u)\n",
+ port, pdev_nr, rhport);
+ usbip_dbg_vhci_sysfs("sockfd(%u) devid(%u) speed(%u)\n",
+ sockfd, devid, speed);
+
+ /* check received parameters */
+ if (!valid_args(&pdev_nr, &rhport, speed))
+ return -EINVAL;
+
+ hcd = platform_get_drvdata(vhcis[pdev_nr].pdev);
+ if (hcd == NULL) {
+ dev_err(dev, "port %d is not ready\n", port);
+ return -EAGAIN;
+ }
+
+ vhci_hcd = hcd_to_vhci_hcd(hcd);
+ vhci = vhci_hcd->vhci;
+
+ if (speed == USB_SPEED_SUPER)
+ vdev = &vhci->vhci_hcd_ss->vdev[rhport];
+ else
+ vdev = &vhci->vhci_hcd_hs->vdev[rhport];
+
+ mutex_lock(&vdev->ud.sysfs_lock);
+
+ /* Extract socket from fd. */
+ socket = sockfd_lookup(sockfd, &err);
+ if (!socket) {
+ dev_err(dev, "failed to lookup sock");
+ err = -EINVAL;
+ goto unlock_mutex;
+ }
+ if (socket->type != SOCK_STREAM) {
+ dev_err(dev, "Expecting SOCK_STREAM - found %d",
+ socket->type);
+ sockfd_put(socket);
+ err = -EINVAL;
+ goto unlock_mutex;
+ }
+
+ /* create threads before locking */
+ tcp_rx = kthread_create(vhci_rx_loop, &vdev->ud, "vhci_rx");
+ if (IS_ERR(tcp_rx)) {
+ sockfd_put(socket);
+ err = -EINVAL;
+ goto unlock_mutex;
+ }
+ tcp_tx = kthread_create(vhci_tx_loop, &vdev->ud, "vhci_tx");
+ if (IS_ERR(tcp_tx)) {
+ kthread_stop(tcp_rx);
+ sockfd_put(socket);
+ err = -EINVAL;
+ goto unlock_mutex;
+ }
+
+ /* get task structs now */
+ get_task_struct(tcp_rx);
+ get_task_struct(tcp_tx);
+
+ /* now begin lock until setting vdev status set */
+ spin_lock_irqsave(&vhci->lock, flags);
+ spin_lock(&vdev->ud.lock);
+
+ if (vdev->ud.status != VDEV_ST_NULL) {
+ /* end of the lock */
+ spin_unlock(&vdev->ud.lock);
+ spin_unlock_irqrestore(&vhci->lock, flags);
+
+ sockfd_put(socket);
+ kthread_stop_put(tcp_rx);
+ kthread_stop_put(tcp_tx);
+
+ dev_err(dev, "port %d already used\n", rhport);
+ /*
+ * Will be retried from userspace
+ * if there's another free port.
+ */
+ err = -EBUSY;
+ goto unlock_mutex;
+ }
+
+ dev_info(dev, "pdev(%u) rhport(%u) sockfd(%d)\n",
+ pdev_nr, rhport, sockfd);
+ dev_info(dev, "devid(%u) speed(%u) speed_str(%s)\n",
+ devid, speed, usb_speed_string(speed));
+
+ vdev->devid = devid;
+ vdev->speed = speed;
+ vdev->ud.sockfd = sockfd;
+ vdev->ud.tcp_socket = socket;
+ vdev->ud.tcp_rx = tcp_rx;
+ vdev->ud.tcp_tx = tcp_tx;
+ vdev->ud.status = VDEV_ST_NOTASSIGNED;
+
+ spin_unlock(&vdev->ud.lock);
+ spin_unlock_irqrestore(&vhci->lock, flags);
+ /* end the lock */
+
+ wake_up_process(vdev->ud.tcp_rx);
+ wake_up_process(vdev->ud.tcp_tx);
+
+ rh_port_connect(vdev, speed);
+
+ dev_info(dev, "Device attached\n");
+
+ mutex_unlock(&vdev->ud.sysfs_lock);
+
+ return count;
+
+unlock_mutex:
+ mutex_unlock(&vdev->ud.sysfs_lock);
+ return err;
+}
+static DEVICE_ATTR_WO(attach);
+
+#define MAX_STATUS_NAME 16
+
+struct status_attr {
+ struct device_attribute attr;
+ char name[MAX_STATUS_NAME+1];
+};
+
+static struct status_attr *status_attrs;
+
+static void set_status_attr(int id)
+{
+ struct status_attr *status;
+
+ status = status_attrs + id;
+ if (id == 0)
+ strcpy(status->name, "status");
+ else
+ snprintf(status->name, MAX_STATUS_NAME+1, "status.%d", id);
+ status->attr.attr.name = status->name;
+ status->attr.attr.mode = S_IRUGO;
+ status->attr.show = status_show;
+ sysfs_attr_init(&status->attr.attr);
+}
+
+static int init_status_attrs(void)
+{
+ int id;
+
+ status_attrs = kcalloc(vhci_num_controllers, sizeof(struct status_attr),
+ GFP_KERNEL);
+ if (status_attrs == NULL)
+ return -ENOMEM;
+
+ for (id = 0; id < vhci_num_controllers; id++)
+ set_status_attr(id);
+
+ return 0;
+}
+
+static void finish_status_attrs(void)
+{
+ kfree(status_attrs);
+}
+
+struct attribute_group vhci_attr_group = {
+ .attrs = NULL,
+};
+
+int vhci_init_attr_group(void)
+{
+ struct attribute **attrs;
+ int ret, i;
+
+ attrs = kcalloc((vhci_num_controllers + 5), sizeof(struct attribute *),
+ GFP_KERNEL);
+ if (attrs == NULL)
+ return -ENOMEM;
+
+ ret = init_status_attrs();
+ if (ret) {
+ kfree(attrs);
+ return ret;
+ }
+ *attrs = &dev_attr_nports.attr;
+ *(attrs + 1) = &dev_attr_detach.attr;
+ *(attrs + 2) = &dev_attr_attach.attr;
+ *(attrs + 3) = &dev_attr_usbip_debug.attr;
+ for (i = 0; i < vhci_num_controllers; i++)
+ *(attrs + i + 4) = &((status_attrs + i)->attr.attr);
+ vhci_attr_group.attrs = attrs;
+ return 0;
+}
+
+void vhci_finish_attr_group(void)
+{
+ finish_status_attrs();
+ kfree(vhci_attr_group.attrs);
+}
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