Version:  2.6.32 2.6.33 2.6.34 2.6.35 2.6.36 2.6.37 2.6.38 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9

Architecture:  x86 arm avr32 blackfin m68k m68knommu microblaze mips powerpc sh

   /*
    * 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/net.h>
  
  #include "usbip_common.h"
  #include "vhci.h"
  
  /* TODO: refine locking ?*/
  
  /* Sysfs entry to show port status */
  static ssize_t show_status(struct device *dev, struct device_attribute *attr,
                             char *out)
  {
          char *s = out;
          int i = 0;
  
          BUG_ON(!the_controller || !out);
  
          spin_lock(&the_controller->lock);
  
          /*
           * output example:
           * prt sta spd dev socket           local_busid
           * 000 004 000 000         c5a7bb80 1-2.3
           * 001 004 000 000         d8cee980 2-3.4
           *
           * IP address can be retrieved from a socket pointer address by looking
           * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a
           * port number and its peer IP address.
           */
          out += sprintf(out, "prt sta spd bus dev socket           "
                         "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, "%16p ", vdev->ud.tcp_socket);
                          out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
  
                  } else {
                          out += sprintf(out, "000 000 000 0000000000000000 0-0");
                  }
  
                  out += sprintf(out, "\n");
                  spin_unlock(&vdev->ud.lock);
          }
  
          spin_unlock(&the_controller->lock);
  
          return out - s;
  }
  static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
  
  /* Sysfs entry to shutdown a virtual connection */
  static int vhci_port_disconnect(__u32 rhport)
  {
          struct vhci_device *vdev;
  
          usbip_dbg_vhci_sysfs("enter\n");
  
          /* lock */
          spin_lock(&the_controller->lock);
  
          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(&the_controller->lock);
  
                  return -EINVAL;
          }
 
         /* unlock */
         spin_unlock(&vdev->ud.lock);
         spin_unlock(&the_controller->lock);
 
         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;
 
         sscanf(buf, "%u", &rhport);
 
         /* 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("speed %d\n", 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;
 
         /*
          * @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
          */
         sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed);
 
         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;
 
         /* check sockfd */
         socket = sockfd_to_socket(sockfd);
         if (!socket)
                 return -EINVAL;
 
         /* now need lock until setting vdev status as used */
 
         /* begin a lock */
         spin_lock(&the_controller->lock);
         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(&the_controller->lock);
 
                 dev_err(dev, "port %d already used\n", rhport);
                 return -EINVAL;
         }
 
         dev_info(dev, "rhport(%u) sockfd(%d) devid(%u) speed(%u)\n",
                  rhport, sockfd, devid, speed);
 
         vdev->devid         = devid;
         vdev->speed         = speed;
         vdev->ud.tcp_socket = socket;
         vdev->ud.status     = VDEV_ST_NOTASSIGNED;
 
         spin_unlock(&vdev->ud.lock);
         spin_unlock(&the_controller->lock);
         /* 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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