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- /*
- * Copyright (C) 2003-2008 Takahiro Hirofuchi
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
- #include <linux/kthread.h>
- #include <linux/file.h>
- #include <linux/net.h>
- #include "usbip_common.h"
- #include "vhci.h"
- /* TODO: refine locking ?*/
- /* Sysfs entry to show port status */
- static ssize_t status_show(struct device *dev, struct device_attribute *attr,
- char *out)
- {
- char *s = out;
- int i = 0;
- unsigned long flags;
- BUG_ON(!the_controller || !out);
- spin_lock_irqsave(&the_controller->lock, flags);
- /*
- * output example:
- * port sta spd dev sockfd local_busid
- * 0000 004 000 00000000 000003 1-2.3
- * 0001 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.
- */
- out += sprintf(out,
- "prt sta spd dev sockfd local_busid\n");
- for (i = 0; i < VHCI_NPORTS; i++) {
- struct vhci_device *vdev = port_to_vdev(i);
- spin_lock(&vdev->ud.lock);
- out += sprintf(out, "%03u %03u ", i, vdev->ud.status);
- if (vdev->ud.status == VDEV_ST_USED) {
- out += sprintf(out, "%03u %08x ",
- vdev->speed, vdev->devid);
- out += sprintf(out, "%06u ", vdev->ud.sockfd);
- out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
- } else
- out += sprintf(out, "000 00000000 000000 0-0");
- out += sprintf(out, "\n");
- spin_unlock(&vdev->ud.lock);
- }
- spin_unlock_irqrestore(&the_controller->lock, flags);
- return out - s;
- }
- static DEVICE_ATTR_RO(status);
- /* Sysfs entry to shutdown a virtual connection */
- static int vhci_port_disconnect(__u32 rhport)
- {
- struct vhci_device *vdev;
- unsigned long flags;
- usbip_dbg_vhci_sysfs("enter\n");
- /* lock */
- spin_lock_irqsave(&the_controller->lock, flags);
- vdev = port_to_vdev(rhport);
- 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(&the_controller->lock, flags);
- return -EINVAL;
- }
- /* unlock */
- spin_unlock(&vdev->ud.lock);
- spin_unlock_irqrestore(&the_controller->lock, flags);
- usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
- return 0;
- }
- static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- int err;
- __u32 rhport = 0;
- if (sscanf(buf, "%u", &rhport) != 1)
- return -EINVAL;
- /* check rhport */
- if (rhport >= VHCI_NPORTS) {
- dev_err(dev, "invalid port %u\n", rhport);
- return -EINVAL;
- }
- err = vhci_port_disconnect(rhport);
- if (err < 0)
- return -EINVAL;
- usbip_dbg_vhci_sysfs("Leave\n");
- return count;
- }
- static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);
- /* Sysfs entry to establish a virtual connection */
- static int valid_args(__u32 rhport, enum usb_device_speed speed)
- {
- /* check rhport */
- if (rhport >= VHCI_NPORTS) {
- pr_err("port %u\n", rhport);
- return -EINVAL;
- }
- /* check speed */
- switch (speed) {
- case USB_SPEED_LOW:
- case USB_SPEED_FULL:
- case USB_SPEED_HIGH:
- case USB_SPEED_WIRELESS:
- break;
- default:
- pr_err("Failed attach request for unsupported USB speed: %s\n",
- usb_speed_string(speed));
- return -EINVAL;
- }
- return 0;
- }
- /*
- * 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 store_attach(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct vhci_device *vdev;
- struct socket *socket;
- int sockfd = 0;
- __u32 rhport = 0, devid = 0, speed = 0;
- int err;
- unsigned long flags;
- /*
- * @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", &rhport, &sockfd, &devid, &speed) != 4)
- return -EINVAL;
- usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n",
- rhport, sockfd, devid, speed);
- /* check received parameters */
- if (valid_args(rhport, speed) < 0)
- return -EINVAL;
- /* Extract socket from fd. */
- socket = sockfd_lookup(sockfd, &err);
- if (!socket)
- return -EINVAL;
- /* now need lock until setting vdev status as used */
- /* begin a lock */
- spin_lock_irqsave(&the_controller->lock, flags);
- vdev = port_to_vdev(rhport);
- spin_lock(&vdev->ud.lock);
- if (vdev->ud.status != VDEV_ST_NULL) {
- /* end of the lock */
- spin_unlock(&vdev->ud.lock);
- spin_unlock_irqrestore(&the_controller->lock, flags);
- sockfd_put(socket);
- dev_err(dev, "port %d already used\n", rhport);
- return -EINVAL;
- }
- dev_info(dev,
- "rhport(%u) sockfd(%d) devid(%u) speed(%u) speed_str(%s)\n",
- rhport, sockfd, devid, speed, usb_speed_string(speed));
- vdev->devid = devid;
- vdev->speed = speed;
- vdev->ud.sockfd = sockfd;
- vdev->ud.tcp_socket = socket;
- vdev->ud.status = VDEV_ST_NOTASSIGNED;
- spin_unlock(&vdev->ud.lock);
- spin_unlock_irqrestore(&the_controller->lock, flags);
- /* end the lock */
- vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
- vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
- rh_port_connect(rhport, speed);
- return count;
- }
- static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach);
- static struct attribute *dev_attrs[] = {
- &dev_attr_status.attr,
- &dev_attr_detach.attr,
- &dev_attr_attach.attr,
- &dev_attr_usbip_debug.attr,
- NULL,
- };
- const struct attribute_group dev_attr_group = {
- .attrs = dev_attrs,
- };
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