2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 #include <linux/kthread.h>
21 #include <linux/file.h>
22 #include <linux/net.h>
24 #include "usbip_common.h"
27 /* TODO: refine locking ?*/
29 /* Sysfs entry to show port status */
30 static ssize_t status_show(struct device *dev, struct device_attribute *attr,
36 BUG_ON(!the_controller || !out);
38 spin_lock(&the_controller->lock);
42 * prt sta spd dev socket local_busid
43 * 000 004 000 000 c5a7bb80 1-2.3
44 * 001 004 000 000 d8cee980 2-3.4
46 * IP address can be retrieved from a socket pointer address by looking
47 * up /proc/net/{tcp,tcp6}. Also, a userland program may remember a
48 * port number and its peer IP address.
50 out += sprintf(out, "prt sta spd bus dev socket "
53 for (i = 0; i < VHCI_NPORTS; i++) {
54 struct vhci_device *vdev = port_to_vdev(i);
56 spin_lock(&vdev->ud.lock);
57 out += sprintf(out, "%03u %03u ", i, vdev->ud.status);
59 if (vdev->ud.status == VDEV_ST_USED) {
60 out += sprintf(out, "%03u %08x ",
61 vdev->speed, vdev->devid);
62 out += sprintf(out, "%16p ", vdev->ud.tcp_socket);
63 out += sprintf(out, "%s", dev_name(&vdev->udev->dev));
66 out += sprintf(out, "000 000 000 0000000000000000 0-0");
69 out += sprintf(out, "\n");
70 spin_unlock(&vdev->ud.lock);
73 spin_unlock(&the_controller->lock);
77 static DEVICE_ATTR_RO(status);
79 /* Sysfs entry to shutdown a virtual connection */
80 static int vhci_port_disconnect(__u32 rhport)
82 struct vhci_device *vdev;
84 usbip_dbg_vhci_sysfs("enter\n");
87 spin_lock(&the_controller->lock);
89 vdev = port_to_vdev(rhport);
91 spin_lock(&vdev->ud.lock);
92 if (vdev->ud.status == VDEV_ST_NULL) {
93 pr_err("not connected %d\n", vdev->ud.status);
96 spin_unlock(&vdev->ud.lock);
97 spin_unlock(&the_controller->lock);
103 spin_unlock(&vdev->ud.lock);
104 spin_unlock(&the_controller->lock);
106 usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
111 static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
112 const char *buf, size_t count)
117 sscanf(buf, "%u", &rhport);
120 if (rhport >= VHCI_NPORTS) {
121 dev_err(dev, "invalid port %u\n", rhport);
125 err = vhci_port_disconnect(rhport);
129 usbip_dbg_vhci_sysfs("Leave\n");
133 static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);
135 /* Sysfs entry to establish a virtual connection */
136 static int valid_args(__u32 rhport, enum usb_device_speed speed)
139 if (rhport >= VHCI_NPORTS) {
140 pr_err("port %u\n", rhport);
149 case USB_SPEED_WIRELESS:
152 pr_err("speed %d\n", speed);
160 * To start a new USB/IP attachment, a userland program needs to setup a TCP
161 * connection and then write its socket descriptor with remote device
162 * information into this sysfs file.
164 * A remote device is virtually attached to the root-hub port of @rhport with
165 * @speed. @devid is embedded into a request to specify the remote device in a
168 * write() returns 0 on success, else negative errno.
170 static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
171 const char *buf, size_t count)
173 struct vhci_device *vdev;
174 struct socket *socket;
176 __u32 rhport = 0, devid = 0, speed = 0;
179 * @rhport: port number of vhci_hcd
180 * @sockfd: socket descriptor of an established TCP connection
181 * @devid: unique device identifier in a remote host
182 * @speed: usb device speed in a remote host
184 sscanf(buf, "%u %u %u %u", &rhport, &sockfd, &devid, &speed);
186 usbip_dbg_vhci_sysfs("rhport(%u) sockfd(%u) devid(%u) speed(%u)\n",
187 rhport, sockfd, devid, speed);
189 /* check received parameters */
190 if (valid_args(rhport, speed) < 0)
193 /* Extract socket from fd. */
194 /* The correct way to clean this up is to fput(socket->file). */
195 socket = sockfd_to_socket(sockfd);
199 /* now need lock until setting vdev status as used */
202 spin_lock(&the_controller->lock);
203 vdev = port_to_vdev(rhport);
204 spin_lock(&vdev->ud.lock);
206 if (vdev->ud.status != VDEV_ST_NULL) {
207 /* end of the lock */
208 spin_unlock(&vdev->ud.lock);
209 spin_unlock(&the_controller->lock);
213 dev_err(dev, "port %d already used\n", rhport);
217 dev_info(dev, "rhport(%u) sockfd(%d) devid(%u) speed(%u)\n",
218 rhport, sockfd, devid, speed);
222 vdev->ud.tcp_socket = socket;
223 vdev->ud.status = VDEV_ST_NOTASSIGNED;
225 spin_unlock(&vdev->ud.lock);
226 spin_unlock(&the_controller->lock);
229 vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
230 vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
232 rh_port_connect(rhport, speed);
236 static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach);
238 static struct attribute *dev_attrs[] = {
239 &dev_attr_status.attr,
240 &dev_attr_detach.attr,
241 &dev_attr_attach.attr,
242 &dev_attr_usbip_debug.attr,
246 const struct attribute_group dev_attr_group = {