2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
3 * Copyright (C) 2015-2016 Nobuo Iwata
5 * This is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 #include <linux/kthread.h>
22 #include <linux/file.h>
23 #include <linux/net.h>
24 #include <linux/platform_device.h>
25 #include <linux/slab.h>
27 #include "usbip_common.h"
30 /* TODO: refine locking ?*/
32 /* Sysfs entry to show port status */
33 static ssize_t status_show_vhci(int pdev_nr, char *out)
35 struct platform_device *pdev = *(vhci_pdevs + pdev_nr);
36 struct vhci_hcd *vhci;
42 usbip_dbg_vhci_sysfs("show status error\n");
46 vhci = hcd_to_vhci(platform_get_drvdata(pdev));
48 spin_lock_irqsave(&vhci->lock, flags);
52 * port sta spd dev sockfd local_busid
53 * 0000 004 000 00000000 000003 1-2.3
54 * 0001 004 000 00000000 000004 2-3.4
56 * Output includes socket fd instead of socket pointer address to
57 * avoid leaking kernel memory address in:
58 * /sys/devices/platform/vhci_hcd.0/status and in debug output.
59 * The socket pointer address is not used at the moment and it was
60 * made visible as a convenient way to find IP address from socket
61 * pointer address by looking up /proc/net/{tcp,tcp6}. As this opens
62 * a security hole, the change is made to use sockfd instead.
64 for (i = 0; i < VHCI_HC_PORTS; i++) {
65 struct vhci_device *vdev = &vhci->vdev[i];
67 spin_lock(&vdev->ud.lock);
68 out += sprintf(out, "%04u %03u ",
69 (pdev_nr * VHCI_HC_PORTS) + i,
72 if (vdev->ud.status == VDEV_ST_USED) {
73 out += sprintf(out, "%03u %08x ",
74 vdev->speed, vdev->devid);
75 out += sprintf(out, "%06u %s",
77 dev_name(&vdev->udev->dev));
80 out += sprintf(out, "000 00000000 ");
81 out += sprintf(out, "000000 0-0");
84 out += sprintf(out, "\n");
85 spin_unlock(&vdev->ud.lock);
88 spin_unlock_irqrestore(&vhci->lock, flags);
93 static ssize_t status_show_not_ready(int pdev_nr, char *out)
98 for (i = 0; i < VHCI_HC_PORTS; i++) {
99 out += sprintf(out, "%04u %03u ",
100 (pdev_nr * VHCI_HC_PORTS) + i,
101 VDEV_ST_NOTASSIGNED);
102 out += sprintf(out, "000 00000000 0000000000000000 0-0");
103 out += sprintf(out, "\n");
108 static int status_name_to_id(const char *name)
114 c = strchr(name, '.');
118 ret = kstrtol(c+1, 10, &val);
125 static ssize_t status_show(struct device *dev,
126 struct device_attribute *attr, char *out)
132 "port sta spd dev sockfd local_busid\n");
134 pdev_nr = status_name_to_id(attr->attr.name);
136 out += status_show_not_ready(pdev_nr, out);
138 out += status_show_vhci(pdev_nr, out);
143 static ssize_t nports_show(struct device *dev, struct device_attribute *attr,
148 out += sprintf(out, "%d\n", VHCI_HC_PORTS * vhci_num_controllers);
151 static DEVICE_ATTR_RO(nports);
153 /* Sysfs entry to shutdown a virtual connection */
154 static int vhci_port_disconnect(struct vhci_hcd *vhci, __u32 rhport)
156 struct vhci_device *vdev = &vhci->vdev[rhport];
159 usbip_dbg_vhci_sysfs("enter\n");
162 spin_lock_irqsave(&vhci->lock, flags);
163 spin_lock(&vdev->ud.lock);
165 if (vdev->ud.status == VDEV_ST_NULL) {
166 pr_err("not connected %d\n", vdev->ud.status);
169 spin_unlock(&vdev->ud.lock);
170 spin_unlock_irqrestore(&vhci->lock, flags);
176 spin_unlock(&vdev->ud.lock);
177 spin_unlock_irqrestore(&vhci->lock, flags);
179 usbip_event_add(&vdev->ud, VDEV_EVENT_DOWN);
184 static int valid_port(__u32 pdev_nr, __u32 rhport)
186 if (pdev_nr >= vhci_num_controllers) {
187 pr_err("pdev %u\n", pdev_nr);
190 if (rhport >= VHCI_HC_PORTS) {
191 pr_err("rhport %u\n", rhport);
197 static ssize_t store_detach(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
200 __u32 port = 0, pdev_nr = 0, rhport = 0;
204 if (kstrtoint(buf, 10, &port) < 0)
207 pdev_nr = port_to_pdev_nr(port);
208 rhport = port_to_rhport(port);
210 if (!valid_port(pdev_nr, rhport))
213 hcd = platform_get_drvdata(*(vhci_pdevs + pdev_nr));
215 dev_err(dev, "port is not ready %u\n", port);
219 ret = vhci_port_disconnect(hcd_to_vhci(hcd), rhport);
223 usbip_dbg_vhci_sysfs("Leave\n");
227 static DEVICE_ATTR(detach, S_IWUSR, NULL, store_detach);
229 static int valid_args(__u32 pdev_nr, __u32 rhport, enum usb_device_speed speed)
231 if (!valid_port(pdev_nr, rhport)) {
239 case USB_SPEED_WIRELESS:
242 pr_err("Failed attach request for unsupported USB speed: %s\n",
243 usb_speed_string(speed));
250 /* Sysfs entry to establish a virtual connection */
252 * To start a new USB/IP attachment, a userland program needs to setup a TCP
253 * connection and then write its socket descriptor with remote device
254 * information into this sysfs file.
256 * A remote device is virtually attached to the root-hub port of @rhport with
257 * @speed. @devid is embedded into a request to specify the remote device in a
260 * write() returns 0 on success, else negative errno.
262 static ssize_t store_attach(struct device *dev, struct device_attribute *attr,
263 const char *buf, size_t count)
265 struct socket *socket;
267 __u32 port = 0, pdev_nr = 0, rhport = 0, devid = 0, speed = 0;
269 struct vhci_hcd *vhci;
270 struct vhci_device *vdev;
275 * @rhport: port number of vhci_hcd
276 * @sockfd: socket descriptor of an established TCP connection
277 * @devid: unique device identifier in a remote host
278 * @speed: usb device speed in a remote host
280 if (sscanf(buf, "%u %u %u %u", &port, &sockfd, &devid, &speed) != 4)
282 pdev_nr = port_to_pdev_nr(port);
283 rhport = port_to_rhport(port);
285 usbip_dbg_vhci_sysfs("port(%u) pdev(%d) rhport(%u)\n",
286 port, pdev_nr, rhport);
287 usbip_dbg_vhci_sysfs("sockfd(%u) devid(%u) speed(%u)\n",
288 sockfd, devid, speed);
290 /* check received parameters */
291 if (!valid_args(pdev_nr, rhport, speed))
294 hcd = platform_get_drvdata(*(vhci_pdevs + pdev_nr));
296 dev_err(dev, "port %d is not ready\n", port);
299 vhci = hcd_to_vhci(hcd);
300 vdev = &vhci->vdev[rhport];
302 /* Extract socket from fd. */
303 socket = sockfd_lookup(sockfd, &err);
307 /* now need lock until setting vdev status as used */
310 spin_lock_irqsave(&vhci->lock, flags);
311 spin_lock(&vdev->ud.lock);
313 if (vdev->ud.status != VDEV_ST_NULL) {
314 /* end of the lock */
315 spin_unlock(&vdev->ud.lock);
316 spin_unlock_irqrestore(&vhci->lock, flags);
320 dev_err(dev, "port %d already used\n", rhport);
324 dev_info(dev, "pdev(%u) rhport(%u) sockfd(%d)\n",
325 pdev_nr, rhport, sockfd);
326 dev_info(dev, "devid(%u) speed(%u) speed_str(%s)\n",
327 devid, speed, usb_speed_string(speed));
331 vdev->ud.sockfd = sockfd;
332 vdev->ud.tcp_socket = socket;
333 vdev->ud.status = VDEV_ST_NOTASSIGNED;
335 spin_unlock(&vdev->ud.lock);
336 spin_unlock_irqrestore(&vhci->lock, flags);
339 vdev->ud.tcp_rx = kthread_get_run(vhci_rx_loop, &vdev->ud, "vhci_rx");
340 vdev->ud.tcp_tx = kthread_get_run(vhci_tx_loop, &vdev->ud, "vhci_tx");
342 rh_port_connect(vdev, speed);
346 static DEVICE_ATTR(attach, S_IWUSR, NULL, store_attach);
348 #define MAX_STATUS_NAME 16
351 struct device_attribute attr;
352 char name[MAX_STATUS_NAME+1];
355 static struct status_attr *status_attrs;
357 static void set_status_attr(int id)
359 struct status_attr *status;
361 status = status_attrs + id;
363 strcpy(status->name, "status");
365 snprintf(status->name, MAX_STATUS_NAME+1, "status.%d", id);
366 status->attr.attr.name = status->name;
367 status->attr.attr.mode = S_IRUGO;
368 status->attr.show = status_show;
369 sysfs_attr_init(&status->attr.attr);
372 static int init_status_attrs(void)
376 status_attrs = kcalloc(vhci_num_controllers, sizeof(struct status_attr),
378 if (status_attrs == NULL)
381 for (id = 0; id < vhci_num_controllers; id++)
387 static void finish_status_attrs(void)
392 struct attribute_group vhci_attr_group = {
396 int vhci_init_attr_group(void)
398 struct attribute **attrs;
401 attrs = kcalloc((vhci_num_controllers + 5), sizeof(struct attribute *),
406 ret = init_status_attrs();
411 *attrs = &dev_attr_nports.attr;
412 *(attrs + 1) = &dev_attr_detach.attr;
413 *(attrs + 2) = &dev_attr_attach.attr;
414 *(attrs + 3) = &dev_attr_usbip_debug.attr;
415 for (i = 0; i < vhci_num_controllers; i++)
416 *(attrs + i + 4) = &((status_attrs + i)->attr.attr);
417 vhci_attr_group.attrs = attrs;
421 void vhci_finish_attr_group(void)
423 finish_status_attrs();
424 kfree(vhci_attr_group.attrs);