1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55
56 #define USB_MAXBUS 64
57 #define USB_DEVICE_MAX USB_MAXBUS * 128
58
59 /* Mutual exclusion for removal, open, and release */
60 DEFINE_MUTEX(usbfs_mutex);
61
62 struct dev_state {
63 struct list_head list; /* state list */
64 struct usb_device *dev;
65 struct file *file;
66 spinlock_t lock; /* protects the async urb lists */
67 struct list_head async_pending;
68 struct list_head async_completed;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 uid_t disc_uid, disc_euid;
73 void __user *disccontext;
74 unsigned long ifclaimed;
75 u32 secid;
76 };
77
78 struct async {
79 struct list_head asynclist;
80 struct dev_state *ps;
81 struct pid *pid;
82 uid_t uid, euid;
83 unsigned int signr;
84 unsigned int ifnum;
85 void __user *userbuffer;
86 void __user *userurb;
87 struct urb *urb;
88 int status;
89 u32 secid;
90 };
91
92 static int usbfs_snoop;
93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
95
96 #define snoop(dev, format, arg...) \
97 do { \
98 if (usbfs_snoop) \
99 dev_info(dev , format , ## arg); \
100 } while (0)
101
102 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
103
104
105 #define MAX_USBFS_BUFFER_SIZE 16384
106
connected(struct dev_state * ps)107 static inline int connected(struct dev_state *ps)
108 {
109 return (!list_empty(&ps->list) &&
110 ps->dev->state != USB_STATE_NOTATTACHED);
111 }
112
usbdev_lseek(struct file * file,loff_t offset,int orig)113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
114 {
115 loff_t ret;
116
117 lock_kernel();
118
119 switch (orig) {
120 case 0:
121 file->f_pos = offset;
122 ret = file->f_pos;
123 break;
124 case 1:
125 file->f_pos += offset;
126 ret = file->f_pos;
127 break;
128 case 2:
129 default:
130 ret = -EINVAL;
131 }
132
133 unlock_kernel();
134 return ret;
135 }
136
usbdev_read(struct file * file,char __user * buf,size_t nbytes,loff_t * ppos)137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
138 loff_t *ppos)
139 {
140 struct dev_state *ps = file->private_data;
141 struct usb_device *dev = ps->dev;
142 ssize_t ret = 0;
143 unsigned len;
144 loff_t pos;
145 int i;
146
147 pos = *ppos;
148 usb_lock_device(dev);
149 if (!connected(ps)) {
150 ret = -ENODEV;
151 goto err;
152 } else if (pos < 0) {
153 ret = -EINVAL;
154 goto err;
155 }
156
157 if (pos < sizeof(struct usb_device_descriptor)) {
158 /* 18 bytes - fits on the stack */
159 struct usb_device_descriptor temp_desc;
160
161 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
162 le16_to_cpus(&temp_desc.bcdUSB);
163 le16_to_cpus(&temp_desc.idVendor);
164 le16_to_cpus(&temp_desc.idProduct);
165 le16_to_cpus(&temp_desc.bcdDevice);
166
167 len = sizeof(struct usb_device_descriptor) - pos;
168 if (len > nbytes)
169 len = nbytes;
170 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
171 ret = -EFAULT;
172 goto err;
173 }
174
175 *ppos += len;
176 buf += len;
177 nbytes -= len;
178 ret += len;
179 }
180
181 pos = sizeof(struct usb_device_descriptor);
182 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
183 struct usb_config_descriptor *config =
184 (struct usb_config_descriptor *)dev->rawdescriptors[i];
185 unsigned int length = le16_to_cpu(config->wTotalLength);
186
187 if (*ppos < pos + length) {
188
189 /* The descriptor may claim to be longer than it
190 * really is. Here is the actual allocated length. */
191 unsigned alloclen =
192 le16_to_cpu(dev->config[i].desc.wTotalLength);
193
194 len = length - (*ppos - pos);
195 if (len > nbytes)
196 len = nbytes;
197
198 /* Simply don't write (skip over) unallocated parts */
199 if (alloclen > (*ppos - pos)) {
200 alloclen -= (*ppos - pos);
201 if (copy_to_user(buf,
202 dev->rawdescriptors[i] + (*ppos - pos),
203 min(len, alloclen))) {
204 ret = -EFAULT;
205 goto err;
206 }
207 }
208
209 *ppos += len;
210 buf += len;
211 nbytes -= len;
212 ret += len;
213 }
214
215 pos += length;
216 }
217
218 err:
219 usb_unlock_device(dev);
220 return ret;
221 }
222
223 /*
224 * async list handling
225 */
226
alloc_async(unsigned int numisoframes)227 static struct async *alloc_async(unsigned int numisoframes)
228 {
229 struct async *as;
230
231 as = kzalloc(sizeof(struct async), GFP_KERNEL);
232 if (!as)
233 return NULL;
234 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
235 if (!as->urb) {
236 kfree(as);
237 return NULL;
238 }
239 return as;
240 }
241
free_async(struct async * as)242 static void free_async(struct async *as)
243 {
244 put_pid(as->pid);
245 kfree(as->urb->transfer_buffer);
246 kfree(as->urb->setup_packet);
247 usb_free_urb(as->urb);
248 kfree(as);
249 }
250
async_newpending(struct async * as)251 static inline void async_newpending(struct async *as)
252 {
253 struct dev_state *ps = as->ps;
254 unsigned long flags;
255
256 spin_lock_irqsave(&ps->lock, flags);
257 list_add_tail(&as->asynclist, &ps->async_pending);
258 spin_unlock_irqrestore(&ps->lock, flags);
259 }
260
async_removepending(struct async * as)261 static inline void async_removepending(struct async *as)
262 {
263 struct dev_state *ps = as->ps;
264 unsigned long flags;
265
266 spin_lock_irqsave(&ps->lock, flags);
267 list_del_init(&as->asynclist);
268 spin_unlock_irqrestore(&ps->lock, flags);
269 }
270
async_getcompleted(struct dev_state * ps)271 static inline struct async *async_getcompleted(struct dev_state *ps)
272 {
273 unsigned long flags;
274 struct async *as = NULL;
275
276 spin_lock_irqsave(&ps->lock, flags);
277 if (!list_empty(&ps->async_completed)) {
278 as = list_entry(ps->async_completed.next, struct async,
279 asynclist);
280 list_del_init(&as->asynclist);
281 }
282 spin_unlock_irqrestore(&ps->lock, flags);
283 return as;
284 }
285
async_getpending(struct dev_state * ps,void __user * userurb)286 static inline struct async *async_getpending(struct dev_state *ps,
287 void __user *userurb)
288 {
289 unsigned long flags;
290 struct async *as;
291
292 spin_lock_irqsave(&ps->lock, flags);
293 list_for_each_entry(as, &ps->async_pending, asynclist)
294 if (as->userurb == userurb) {
295 list_del_init(&as->asynclist);
296 spin_unlock_irqrestore(&ps->lock, flags);
297 return as;
298 }
299 spin_unlock_irqrestore(&ps->lock, flags);
300 return NULL;
301 }
302
snoop_urb(struct urb * urb,void __user * userurb)303 static void snoop_urb(struct urb *urb, void __user *userurb)
304 {
305 int j;
306 unsigned char *data = urb->transfer_buffer;
307
308 if (!usbfs_snoop)
309 return;
310
311 dev_info(&urb->dev->dev, "direction=%s\n",
312 usb_urb_dir_in(urb) ? "IN" : "OUT");
313 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
314 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
315 urb->transfer_buffer_length);
316 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
317 dev_info(&urb->dev->dev, "data: ");
318 for (j = 0; j < urb->transfer_buffer_length; ++j)
319 printk("%02x ", data[j]);
320 printk("\n");
321 }
322
async_completed(struct urb * urb)323 static void async_completed(struct urb *urb)
324 {
325 struct async *as = urb->context;
326 struct dev_state *ps = as->ps;
327 struct siginfo sinfo;
328
329 spin_lock(&ps->lock);
330 list_move_tail(&as->asynclist, &ps->async_completed);
331 spin_unlock(&ps->lock);
332 as->status = urb->status;
333 if (as->signr) {
334 sinfo.si_signo = as->signr;
335 sinfo.si_errno = as->status;
336 sinfo.si_code = SI_ASYNCIO;
337 sinfo.si_addr = as->userurb;
338 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
339 as->euid, as->secid);
340 }
341 snoop(&urb->dev->dev, "urb complete\n");
342 snoop_urb(urb, as->userurb);
343 wake_up(&ps->wait);
344 }
345
destroy_async(struct dev_state * ps,struct list_head * list)346 static void destroy_async(struct dev_state *ps, struct list_head *list)
347 {
348 struct async *as;
349 unsigned long flags;
350
351 spin_lock_irqsave(&ps->lock, flags);
352 while (!list_empty(list)) {
353 as = list_entry(list->next, struct async, asynclist);
354 list_del_init(&as->asynclist);
355
356 /* drop the spinlock so the completion handler can run */
357 spin_unlock_irqrestore(&ps->lock, flags);
358 usb_kill_urb(as->urb);
359 spin_lock_irqsave(&ps->lock, flags);
360 }
361 spin_unlock_irqrestore(&ps->lock, flags);
362 }
363
destroy_async_on_interface(struct dev_state * ps,unsigned int ifnum)364 static void destroy_async_on_interface(struct dev_state *ps,
365 unsigned int ifnum)
366 {
367 struct list_head *p, *q, hitlist;
368 unsigned long flags;
369
370 INIT_LIST_HEAD(&hitlist);
371 spin_lock_irqsave(&ps->lock, flags);
372 list_for_each_safe(p, q, &ps->async_pending)
373 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
374 list_move_tail(p, &hitlist);
375 spin_unlock_irqrestore(&ps->lock, flags);
376 destroy_async(ps, &hitlist);
377 }
378
destroy_all_async(struct dev_state * ps)379 static inline void destroy_all_async(struct dev_state *ps)
380 {
381 destroy_async(ps, &ps->async_pending);
382 }
383
384 /*
385 * interface claims are made only at the request of user level code,
386 * which can also release them (explicitly or by closing files).
387 * they're also undone when devices disconnect.
388 */
389
driver_probe(struct usb_interface * intf,const struct usb_device_id * id)390 static int driver_probe(struct usb_interface *intf,
391 const struct usb_device_id *id)
392 {
393 return -ENODEV;
394 }
395
driver_disconnect(struct usb_interface * intf)396 static void driver_disconnect(struct usb_interface *intf)
397 {
398 struct dev_state *ps = usb_get_intfdata(intf);
399 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
400
401 if (!ps)
402 return;
403
404 /* NOTE: this relies on usbcore having canceled and completed
405 * all pending I/O requests; 2.6 does that.
406 */
407
408 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
409 clear_bit(ifnum, &ps->ifclaimed);
410 else
411 dev_warn(&intf->dev, "interface number %u out of range\n",
412 ifnum);
413
414 usb_set_intfdata(intf, NULL);
415
416 /* force async requests to complete */
417 destroy_async_on_interface(ps, ifnum);
418 }
419
420 /* The following routines are merely placeholders. There is no way
421 * to inform a user task about suspend or resumes.
422 */
driver_suspend(struct usb_interface * intf,pm_message_t msg)423 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
424 {
425 return 0;
426 }
427
driver_resume(struct usb_interface * intf)428 static int driver_resume(struct usb_interface *intf)
429 {
430 return 0;
431 }
432
433 struct usb_driver usbfs_driver = {
434 .name = "usbfs",
435 .probe = driver_probe,
436 .disconnect = driver_disconnect,
437 .suspend = driver_suspend,
438 .resume = driver_resume,
439 };
440
claimintf(struct dev_state * ps,unsigned int ifnum)441 static int claimintf(struct dev_state *ps, unsigned int ifnum)
442 {
443 struct usb_device *dev = ps->dev;
444 struct usb_interface *intf;
445 int err;
446
447 if (ifnum >= 8*sizeof(ps->ifclaimed))
448 return -EINVAL;
449 /* already claimed */
450 if (test_bit(ifnum, &ps->ifclaimed))
451 return 0;
452
453 intf = usb_ifnum_to_if(dev, ifnum);
454 if (!intf)
455 err = -ENOENT;
456 else
457 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
458 if (err == 0)
459 set_bit(ifnum, &ps->ifclaimed);
460 return err;
461 }
462
releaseintf(struct dev_state * ps,unsigned int ifnum)463 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
464 {
465 struct usb_device *dev;
466 struct usb_interface *intf;
467 int err;
468
469 err = -EINVAL;
470 if (ifnum >= 8*sizeof(ps->ifclaimed))
471 return err;
472 dev = ps->dev;
473 intf = usb_ifnum_to_if(dev, ifnum);
474 if (!intf)
475 err = -ENOENT;
476 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
477 usb_driver_release_interface(&usbfs_driver, intf);
478 err = 0;
479 }
480 return err;
481 }
482
checkintf(struct dev_state * ps,unsigned int ifnum)483 static int checkintf(struct dev_state *ps, unsigned int ifnum)
484 {
485 if (ps->dev->state != USB_STATE_CONFIGURED)
486 return -EHOSTUNREACH;
487 if (ifnum >= 8*sizeof(ps->ifclaimed))
488 return -EINVAL;
489 if (test_bit(ifnum, &ps->ifclaimed))
490 return 0;
491 /* if not yet claimed, claim it for the driver */
492 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
493 "interface %u before use\n", task_pid_nr(current),
494 current->comm, ifnum);
495 return claimintf(ps, ifnum);
496 }
497
findintfep(struct usb_device * dev,unsigned int ep)498 static int findintfep(struct usb_device *dev, unsigned int ep)
499 {
500 unsigned int i, j, e;
501 struct usb_interface *intf;
502 struct usb_host_interface *alts;
503 struct usb_endpoint_descriptor *endpt;
504
505 if (ep & ~(USB_DIR_IN|0xf))
506 return -EINVAL;
507 if (!dev->actconfig)
508 return -ESRCH;
509 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
510 intf = dev->actconfig->interface[i];
511 for (j = 0; j < intf->num_altsetting; j++) {
512 alts = &intf->altsetting[j];
513 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
514 endpt = &alts->endpoint[e].desc;
515 if (endpt->bEndpointAddress == ep)
516 return alts->desc.bInterfaceNumber;
517 }
518 }
519 }
520 return -ENOENT;
521 }
522
check_ctrlrecip(struct dev_state * ps,unsigned int requesttype,unsigned int index)523 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
524 unsigned int index)
525 {
526 int ret = 0;
527
528 if (ps->dev->state != USB_STATE_ADDRESS
529 && ps->dev->state != USB_STATE_CONFIGURED)
530 return -EHOSTUNREACH;
531 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
532 return 0;
533
534 index &= 0xff;
535 switch (requesttype & USB_RECIP_MASK) {
536 case USB_RECIP_ENDPOINT:
537 ret = findintfep(ps->dev, index);
538 if (ret >= 0)
539 ret = checkintf(ps, ret);
540 break;
541
542 case USB_RECIP_INTERFACE:
543 ret = checkintf(ps, index);
544 break;
545 }
546 return ret;
547 }
548
match_devt(struct device * dev,void * data)549 static int match_devt(struct device *dev, void *data)
550 {
551 return dev->devt == (dev_t) (unsigned long) data;
552 }
553
usbdev_lookup_by_devt(dev_t devt)554 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
555 {
556 struct device *dev;
557
558 dev = bus_find_device(&usb_bus_type, NULL,
559 (void *) (unsigned long) devt, match_devt);
560 if (!dev)
561 return NULL;
562 return container_of(dev, struct usb_device, dev);
563 }
564
565 /*
566 * file operations
567 */
usbdev_open(struct inode * inode,struct file * file)568 static int usbdev_open(struct inode *inode, struct file *file)
569 {
570 struct usb_device *dev = NULL;
571 struct dev_state *ps;
572 const struct cred *cred = current_cred();
573 int ret;
574
575 lock_kernel();
576 /* Protect against simultaneous removal or release */
577 mutex_lock(&usbfs_mutex);
578
579 ret = -ENOMEM;
580 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
581 if (!ps)
582 goto out;
583
584 ret = -ENOENT;
585
586 /* usbdev device-node */
587 if (imajor(inode) == USB_DEVICE_MAJOR)
588 dev = usbdev_lookup_by_devt(inode->i_rdev);
589 #ifdef CONFIG_USB_DEVICEFS
590 /* procfs file */
591 if (!dev) {
592 dev = inode->i_private;
593 if (dev && dev->usbfs_dentry &&
594 dev->usbfs_dentry->d_inode == inode)
595 usb_get_dev(dev);
596 else
597 dev = NULL;
598 }
599 #endif
600 if (!dev || dev->state == USB_STATE_NOTATTACHED)
601 goto out;
602 ret = usb_autoresume_device(dev);
603 if (ret)
604 goto out;
605
606 ret = 0;
607 ps->dev = dev;
608 ps->file = file;
609 spin_lock_init(&ps->lock);
610 INIT_LIST_HEAD(&ps->list);
611 INIT_LIST_HEAD(&ps->async_pending);
612 INIT_LIST_HEAD(&ps->async_completed);
613 init_waitqueue_head(&ps->wait);
614 ps->discsignr = 0;
615 ps->disc_pid = get_pid(task_pid(current));
616 ps->disc_uid = cred->uid;
617 ps->disc_euid = cred->euid;
618 ps->disccontext = NULL;
619 ps->ifclaimed = 0;
620 security_task_getsecid(current, &ps->secid);
621 smp_wmb();
622 list_add_tail(&ps->list, &dev->filelist);
623 file->private_data = ps;
624 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
625 current->comm);
626 out:
627 if (ret) {
628 kfree(ps);
629 usb_put_dev(dev);
630 }
631 mutex_unlock(&usbfs_mutex);
632 unlock_kernel();
633 return ret;
634 }
635
usbdev_release(struct inode * inode,struct file * file)636 static int usbdev_release(struct inode *inode, struct file *file)
637 {
638 struct dev_state *ps = file->private_data;
639 struct usb_device *dev = ps->dev;
640 unsigned int ifnum;
641 struct async *as;
642
643 usb_lock_device(dev);
644
645 /* Protect against simultaneous open */
646 mutex_lock(&usbfs_mutex);
647 list_del_init(&ps->list);
648 mutex_unlock(&usbfs_mutex);
649
650 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
651 ifnum++) {
652 if (test_bit(ifnum, &ps->ifclaimed))
653 releaseintf(ps, ifnum);
654 }
655 destroy_all_async(ps);
656 usb_autosuspend_device(dev);
657 usb_unlock_device(dev);
658 usb_put_dev(dev);
659 put_pid(ps->disc_pid);
660
661 as = async_getcompleted(ps);
662 while (as) {
663 free_async(as);
664 as = async_getcompleted(ps);
665 }
666 kfree(ps);
667 return 0;
668 }
669
proc_control(struct dev_state * ps,void __user * arg)670 static int proc_control(struct dev_state *ps, void __user *arg)
671 {
672 struct usb_device *dev = ps->dev;
673 struct usbdevfs_ctrltransfer ctrl;
674 unsigned int tmo;
675 unsigned char *tbuf;
676 unsigned wLength;
677 int i, j, ret;
678
679 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
680 return -EFAULT;
681 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
682 if (ret)
683 return ret;
684 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
685 if (wLength > PAGE_SIZE)
686 return -EINVAL;
687 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
688 if (!tbuf)
689 return -ENOMEM;
690 tmo = ctrl.timeout;
691 if (ctrl.bRequestType & 0x80) {
692 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
693 ctrl.wLength)) {
694 free_page((unsigned long)tbuf);
695 return -EINVAL;
696 }
697 snoop(&dev->dev, "control read: bRequest=%02x "
698 "bRrequestType=%02x wValue=%04x "
699 "wIndex=%04x wLength=%04x\n",
700 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
701 ctrl.wIndex, ctrl.wLength);
702
703 usb_unlock_device(dev);
704 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
705 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
706 tbuf, ctrl.wLength, tmo);
707 usb_lock_device(dev);
708 if ((i > 0) && ctrl.wLength) {
709 if (usbfs_snoop) {
710 dev_info(&dev->dev, "control read: data ");
711 for (j = 0; j < i; ++j)
712 printk("%02x ", (u8)(tbuf)[j]);
713 printk("\n");
714 }
715 if (copy_to_user(ctrl.data, tbuf, i)) {
716 free_page((unsigned long)tbuf);
717 return -EFAULT;
718 }
719 }
720 } else {
721 if (ctrl.wLength) {
722 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
723 free_page((unsigned long)tbuf);
724 return -EFAULT;
725 }
726 }
727 snoop(&dev->dev, "control write: bRequest=%02x "
728 "bRrequestType=%02x wValue=%04x "
729 "wIndex=%04x wLength=%04x\n",
730 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
731 ctrl.wIndex, ctrl.wLength);
732 if (usbfs_snoop) {
733 dev_info(&dev->dev, "control write: data: ");
734 for (j = 0; j < ctrl.wLength; ++j)
735 printk("%02x ", (unsigned char)(tbuf)[j]);
736 printk("\n");
737 }
738 usb_unlock_device(dev);
739 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
740 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
741 tbuf, ctrl.wLength, tmo);
742 usb_lock_device(dev);
743 }
744 free_page((unsigned long)tbuf);
745 if (i < 0 && i != -EPIPE) {
746 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
747 "failed cmd %s rqt %u rq %u len %u ret %d\n",
748 current->comm, ctrl.bRequestType, ctrl.bRequest,
749 ctrl.wLength, i);
750 }
751 return i;
752 }
753
proc_bulk(struct dev_state * ps,void __user * arg)754 static int proc_bulk(struct dev_state *ps, void __user *arg)
755 {
756 struct usb_device *dev = ps->dev;
757 struct usbdevfs_bulktransfer bulk;
758 unsigned int tmo, len1, pipe;
759 int len2;
760 unsigned char *tbuf;
761 int i, j, ret;
762
763 if (copy_from_user(&bulk, arg, sizeof(bulk)))
764 return -EFAULT;
765 ret = findintfep(ps->dev, bulk.ep);
766 if (ret < 0)
767 return ret;
768 ret = checkintf(ps, ret);
769 if (ret)
770 return ret;
771 if (bulk.ep & USB_DIR_IN)
772 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
773 else
774 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
775 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
776 return -EINVAL;
777 len1 = bulk.len;
778 if (len1 > MAX_USBFS_BUFFER_SIZE)
779 return -EINVAL;
780 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
781 return -ENOMEM;
782 tmo = bulk.timeout;
783 if (bulk.ep & 0x80) {
784 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
785 kfree(tbuf);
786 return -EINVAL;
787 }
788 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
789 bulk.len, bulk.timeout);
790 usb_unlock_device(dev);
791 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
792 usb_lock_device(dev);
793 if (!i && len2) {
794 if (usbfs_snoop) {
795 dev_info(&dev->dev, "bulk read: data ");
796 for (j = 0; j < len2; ++j)
797 printk("%02x ", (u8)(tbuf)[j]);
798 printk("\n");
799 }
800 if (copy_to_user(bulk.data, tbuf, len2)) {
801 kfree(tbuf);
802 return -EFAULT;
803 }
804 }
805 } else {
806 if (len1) {
807 if (copy_from_user(tbuf, bulk.data, len1)) {
808 kfree(tbuf);
809 return -EFAULT;
810 }
811 }
812 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
813 bulk.len, bulk.timeout);
814 if (usbfs_snoop) {
815 dev_info(&dev->dev, "bulk write: data: ");
816 for (j = 0; j < len1; ++j)
817 printk("%02x ", (unsigned char)(tbuf)[j]);
818 printk("\n");
819 }
820 usb_unlock_device(dev);
821 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
822 usb_lock_device(dev);
823 }
824 kfree(tbuf);
825 if (i < 0)
826 return i;
827 return len2;
828 }
829
proc_resetep(struct dev_state * ps,void __user * arg)830 static int proc_resetep(struct dev_state *ps, void __user *arg)
831 {
832 unsigned int ep;
833 int ret;
834
835 if (get_user(ep, (unsigned int __user *)arg))
836 return -EFAULT;
837 ret = findintfep(ps->dev, ep);
838 if (ret < 0)
839 return ret;
840 ret = checkintf(ps, ret);
841 if (ret)
842 return ret;
843 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
844 return 0;
845 }
846
proc_clearhalt(struct dev_state * ps,void __user * arg)847 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
848 {
849 unsigned int ep;
850 int pipe;
851 int ret;
852
853 if (get_user(ep, (unsigned int __user *)arg))
854 return -EFAULT;
855 ret = findintfep(ps->dev, ep);
856 if (ret < 0)
857 return ret;
858 ret = checkintf(ps, ret);
859 if (ret)
860 return ret;
861 if (ep & USB_DIR_IN)
862 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
863 else
864 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
865
866 return usb_clear_halt(ps->dev, pipe);
867 }
868
proc_getdriver(struct dev_state * ps,void __user * arg)869 static int proc_getdriver(struct dev_state *ps, void __user *arg)
870 {
871 struct usbdevfs_getdriver gd;
872 struct usb_interface *intf;
873 int ret;
874
875 if (copy_from_user(&gd, arg, sizeof(gd)))
876 return -EFAULT;
877 intf = usb_ifnum_to_if(ps->dev, gd.interface);
878 if (!intf || !intf->dev.driver)
879 ret = -ENODATA;
880 else {
881 strncpy(gd.driver, intf->dev.driver->name,
882 sizeof(gd.driver));
883 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
884 }
885 return ret;
886 }
887
proc_connectinfo(struct dev_state * ps,void __user * arg)888 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
889 {
890 struct usbdevfs_connectinfo ci;
891
892 ci.devnum = ps->dev->devnum;
893 ci.slow = ps->dev->speed == USB_SPEED_LOW;
894 if (copy_to_user(arg, &ci, sizeof(ci)))
895 return -EFAULT;
896 return 0;
897 }
898
proc_resetdevice(struct dev_state * ps)899 static int proc_resetdevice(struct dev_state *ps)
900 {
901 return usb_reset_device(ps->dev);
902 }
903
proc_setintf(struct dev_state * ps,void __user * arg)904 static int proc_setintf(struct dev_state *ps, void __user *arg)
905 {
906 struct usbdevfs_setinterface setintf;
907 int ret;
908
909 if (copy_from_user(&setintf, arg, sizeof(setintf)))
910 return -EFAULT;
911 if ((ret = checkintf(ps, setintf.interface)))
912 return ret;
913 return usb_set_interface(ps->dev, setintf.interface,
914 setintf.altsetting);
915 }
916
proc_setconfig(struct dev_state * ps,void __user * arg)917 static int proc_setconfig(struct dev_state *ps, void __user *arg)
918 {
919 int u;
920 int status = 0;
921 struct usb_host_config *actconfig;
922
923 if (get_user(u, (int __user *)arg))
924 return -EFAULT;
925
926 actconfig = ps->dev->actconfig;
927
928 /* Don't touch the device if any interfaces are claimed.
929 * It could interfere with other drivers' operations, and if
930 * an interface is claimed by usbfs it could easily deadlock.
931 */
932 if (actconfig) {
933 int i;
934
935 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
936 if (usb_interface_claimed(actconfig->interface[i])) {
937 dev_warn(&ps->dev->dev,
938 "usbfs: interface %d claimed by %s "
939 "while '%s' sets config #%d\n",
940 actconfig->interface[i]
941 ->cur_altsetting
942 ->desc.bInterfaceNumber,
943 actconfig->interface[i]
944 ->dev.driver->name,
945 current->comm, u);
946 status = -EBUSY;
947 break;
948 }
949 }
950 }
951
952 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
953 * so avoid usb_set_configuration()'s kick to sysfs
954 */
955 if (status == 0) {
956 if (actconfig && actconfig->desc.bConfigurationValue == u)
957 status = usb_reset_configuration(ps->dev);
958 else
959 status = usb_set_configuration(ps->dev, u);
960 }
961
962 return status;
963 }
964
proc_do_submiturb(struct dev_state * ps,struct usbdevfs_urb * uurb,struct usbdevfs_iso_packet_desc __user * iso_frame_desc,void __user * arg)965 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
966 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
967 void __user *arg)
968 {
969 struct usbdevfs_iso_packet_desc *isopkt = NULL;
970 struct usb_host_endpoint *ep;
971 struct async *as;
972 struct usb_ctrlrequest *dr = NULL;
973 const struct cred *cred = current_cred();
974 unsigned int u, totlen, isofrmlen;
975 int ret, ifnum = -1;
976 int is_in;
977
978 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
979 USBDEVFS_URB_SHORT_NOT_OK |
980 USBDEVFS_URB_NO_FSBR |
981 USBDEVFS_URB_ZERO_PACKET |
982 USBDEVFS_URB_NO_INTERRUPT))
983 return -EINVAL;
984 if (!uurb->buffer)
985 return -EINVAL;
986 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
987 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
988 ifnum = findintfep(ps->dev, uurb->endpoint);
989 if (ifnum < 0)
990 return ifnum;
991 ret = checkintf(ps, ifnum);
992 if (ret)
993 return ret;
994 }
995 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
996 is_in = 1;
997 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
998 } else {
999 is_in = 0;
1000 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1001 }
1002 if (!ep)
1003 return -ENOENT;
1004 switch(uurb->type) {
1005 case USBDEVFS_URB_TYPE_CONTROL:
1006 if (!usb_endpoint_xfer_control(&ep->desc))
1007 return -EINVAL;
1008 /* min 8 byte setup packet,
1009 * max 8 byte setup plus an arbitrary data stage */
1010 if (uurb->buffer_length < 8 ||
1011 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1012 return -EINVAL;
1013 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1014 if (!dr)
1015 return -ENOMEM;
1016 if (copy_from_user(dr, uurb->buffer, 8)) {
1017 kfree(dr);
1018 return -EFAULT;
1019 }
1020 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1021 kfree(dr);
1022 return -EINVAL;
1023 }
1024 ret = check_ctrlrecip(ps, dr->bRequestType,
1025 le16_to_cpup(&dr->wIndex));
1026 if (ret) {
1027 kfree(dr);
1028 return ret;
1029 }
1030 uurb->number_of_packets = 0;
1031 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1032 uurb->buffer += 8;
1033 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1034 is_in = 1;
1035 uurb->endpoint |= USB_DIR_IN;
1036 } else {
1037 is_in = 0;
1038 uurb->endpoint &= ~USB_DIR_IN;
1039 }
1040 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1041 uurb->buffer, uurb->buffer_length)) {
1042 kfree(dr);
1043 return -EFAULT;
1044 }
1045 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1046 "bRrequestType=%02x wValue=%04x "
1047 "wIndex=%04x wLength=%04x\n",
1048 dr->bRequest, dr->bRequestType,
1049 __le16_to_cpup(&dr->wValue),
1050 __le16_to_cpup(&dr->wIndex),
1051 __le16_to_cpup(&dr->wLength));
1052 break;
1053
1054 case USBDEVFS_URB_TYPE_BULK:
1055 switch (usb_endpoint_type(&ep->desc)) {
1056 case USB_ENDPOINT_XFER_CONTROL:
1057 case USB_ENDPOINT_XFER_ISOC:
1058 return -EINVAL;
1059 /* allow single-shot interrupt transfers, at bogus rates */
1060 }
1061 uurb->number_of_packets = 0;
1062 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1063 return -EINVAL;
1064 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1065 uurb->buffer, uurb->buffer_length))
1066 return -EFAULT;
1067 snoop(&ps->dev->dev, "bulk urb\n");
1068 break;
1069
1070 case USBDEVFS_URB_TYPE_ISO:
1071 /* arbitrary limit */
1072 if (uurb->number_of_packets < 1 ||
1073 uurb->number_of_packets > 128)
1074 return -EINVAL;
1075 if (!usb_endpoint_xfer_isoc(&ep->desc))
1076 return -EINVAL;
1077 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1078 uurb->number_of_packets;
1079 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1080 return -ENOMEM;
1081 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1082 kfree(isopkt);
1083 return -EFAULT;
1084 }
1085 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1086 /* arbitrary limit,
1087 * sufficient for USB 2.0 high-bandwidth iso */
1088 if (isopkt[u].length > 8192) {
1089 kfree(isopkt);
1090 return -EINVAL;
1091 }
1092 totlen += isopkt[u].length;
1093 }
1094 if (totlen > 32768) {
1095 kfree(isopkt);
1096 return -EINVAL;
1097 }
1098 uurb->buffer_length = totlen;
1099 snoop(&ps->dev->dev, "iso urb\n");
1100 break;
1101
1102 case USBDEVFS_URB_TYPE_INTERRUPT:
1103 uurb->number_of_packets = 0;
1104 if (!usb_endpoint_xfer_int(&ep->desc))
1105 return -EINVAL;
1106 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1107 return -EINVAL;
1108 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1109 uurb->buffer, uurb->buffer_length))
1110 return -EFAULT;
1111 snoop(&ps->dev->dev, "interrupt urb\n");
1112 break;
1113
1114 default:
1115 return -EINVAL;
1116 }
1117 as = alloc_async(uurb->number_of_packets);
1118 if (!as) {
1119 kfree(isopkt);
1120 kfree(dr);
1121 return -ENOMEM;
1122 }
1123 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1124 if (!as->urb->transfer_buffer) {
1125 kfree(isopkt);
1126 kfree(dr);
1127 free_async(as);
1128 return -ENOMEM;
1129 }
1130 as->urb->dev = ps->dev;
1131 as->urb->pipe = (uurb->type << 30) |
1132 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1133 (uurb->endpoint & USB_DIR_IN);
1134
1135 /* This tedious sequence is necessary because the URB_* flags
1136 * are internal to the kernel and subject to change, whereas
1137 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1138 */
1139 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1140 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1141 u |= URB_ISO_ASAP;
1142 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1143 u |= URB_SHORT_NOT_OK;
1144 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1145 u |= URB_NO_FSBR;
1146 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1147 u |= URB_ZERO_PACKET;
1148 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1149 u |= URB_NO_INTERRUPT;
1150 as->urb->transfer_flags = u;
1151
1152 as->urb->transfer_buffer_length = uurb->buffer_length;
1153 as->urb->setup_packet = (unsigned char *)dr;
1154 as->urb->start_frame = uurb->start_frame;
1155 as->urb->number_of_packets = uurb->number_of_packets;
1156 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1157 ps->dev->speed == USB_SPEED_HIGH)
1158 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1159 else
1160 as->urb->interval = ep->desc.bInterval;
1161 as->urb->context = as;
1162 as->urb->complete = async_completed;
1163 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1164 as->urb->iso_frame_desc[u].offset = totlen;
1165 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1166 totlen += isopkt[u].length;
1167 }
1168 kfree(isopkt);
1169 as->ps = ps;
1170 as->userurb = arg;
1171 if (uurb->endpoint & USB_DIR_IN)
1172 as->userbuffer = uurb->buffer;
1173 else
1174 as->userbuffer = NULL;
1175 as->signr = uurb->signr;
1176 as->ifnum = ifnum;
1177 as->pid = get_pid(task_pid(current));
1178 as->uid = cred->uid;
1179 as->euid = cred->euid;
1180 security_task_getsecid(current, &as->secid);
1181 if (!is_in) {
1182 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1183 as->urb->transfer_buffer_length)) {
1184 free_async(as);
1185 return -EFAULT;
1186 }
1187 }
1188 snoop_urb(as->urb, as->userurb);
1189 async_newpending(as);
1190 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1191 dev_printk(KERN_DEBUG, &ps->dev->dev,
1192 "usbfs: usb_submit_urb returned %d\n", ret);
1193 async_removepending(as);
1194 free_async(as);
1195 return ret;
1196 }
1197 return 0;
1198 }
1199
proc_submiturb(struct dev_state * ps,void __user * arg)1200 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1201 {
1202 struct usbdevfs_urb uurb;
1203
1204 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1205 return -EFAULT;
1206
1207 return proc_do_submiturb(ps, &uurb,
1208 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1209 arg);
1210 }
1211
proc_unlinkurb(struct dev_state * ps,void __user * arg)1212 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1213 {
1214 struct async *as;
1215
1216 as = async_getpending(ps, arg);
1217 if (!as)
1218 return -EINVAL;
1219 usb_kill_urb(as->urb);
1220 return 0;
1221 }
1222
processcompl(struct async * as,void __user * __user * arg)1223 static int processcompl(struct async *as, void __user * __user *arg)
1224 {
1225 struct urb *urb = as->urb;
1226 struct usbdevfs_urb __user *userurb = as->userurb;
1227 void __user *addr = as->userurb;
1228 unsigned int i;
1229
1230 if (as->userbuffer)
1231 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1232 urb->transfer_buffer_length))
1233 return -EFAULT;
1234 if (put_user(as->status, &userurb->status))
1235 return -EFAULT;
1236 if (put_user(urb->actual_length, &userurb->actual_length))
1237 return -EFAULT;
1238 if (put_user(urb->error_count, &userurb->error_count))
1239 return -EFAULT;
1240
1241 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1242 for (i = 0; i < urb->number_of_packets; i++) {
1243 if (put_user(urb->iso_frame_desc[i].actual_length,
1244 &userurb->iso_frame_desc[i].actual_length))
1245 return -EFAULT;
1246 if (put_user(urb->iso_frame_desc[i].status,
1247 &userurb->iso_frame_desc[i].status))
1248 return -EFAULT;
1249 }
1250 }
1251
1252 free_async(as);
1253
1254 if (put_user(addr, (void __user * __user *)arg))
1255 return -EFAULT;
1256 return 0;
1257 }
1258
reap_as(struct dev_state * ps)1259 static struct async *reap_as(struct dev_state *ps)
1260 {
1261 DECLARE_WAITQUEUE(wait, current);
1262 struct async *as = NULL;
1263 struct usb_device *dev = ps->dev;
1264
1265 add_wait_queue(&ps->wait, &wait);
1266 for (;;) {
1267 __set_current_state(TASK_INTERRUPTIBLE);
1268 as = async_getcompleted(ps);
1269 if (as)
1270 break;
1271 if (signal_pending(current))
1272 break;
1273 usb_unlock_device(dev);
1274 schedule();
1275 usb_lock_device(dev);
1276 }
1277 remove_wait_queue(&ps->wait, &wait);
1278 set_current_state(TASK_RUNNING);
1279 return as;
1280 }
1281
proc_reapurb(struct dev_state * ps,void __user * arg)1282 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1283 {
1284 struct async *as = reap_as(ps);
1285 if (as)
1286 return processcompl(as, (void __user * __user *)arg);
1287 if (signal_pending(current))
1288 return -EINTR;
1289 return -EIO;
1290 }
1291
proc_reapurbnonblock(struct dev_state * ps,void __user * arg)1292 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1293 {
1294 struct async *as;
1295
1296 if (!(as = async_getcompleted(ps)))
1297 return -EAGAIN;
1298 return processcompl(as, (void __user * __user *)arg);
1299 }
1300
1301 #ifdef CONFIG_COMPAT
1302
get_urb32(struct usbdevfs_urb * kurb,struct usbdevfs_urb32 __user * uurb)1303 static int get_urb32(struct usbdevfs_urb *kurb,
1304 struct usbdevfs_urb32 __user *uurb)
1305 {
1306 __u32 uptr;
1307 if (get_user(kurb->type, &uurb->type) ||
1308 __get_user(kurb->endpoint, &uurb->endpoint) ||
1309 __get_user(kurb->status, &uurb->status) ||
1310 __get_user(kurb->flags, &uurb->flags) ||
1311 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1312 __get_user(kurb->actual_length, &uurb->actual_length) ||
1313 __get_user(kurb->start_frame, &uurb->start_frame) ||
1314 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1315 __get_user(kurb->error_count, &uurb->error_count) ||
1316 __get_user(kurb->signr, &uurb->signr))
1317 return -EFAULT;
1318
1319 if (__get_user(uptr, &uurb->buffer))
1320 return -EFAULT;
1321 kurb->buffer = compat_ptr(uptr);
1322 if (__get_user(uptr, &uurb->usercontext))
1323 return -EFAULT;
1324 kurb->usercontext = compat_ptr(uptr);
1325
1326 return 0;
1327 }
1328
proc_submiturb_compat(struct dev_state * ps,void __user * arg)1329 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1330 {
1331 struct usbdevfs_urb uurb;
1332
1333 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1334 return -EFAULT;
1335
1336 return proc_do_submiturb(ps, &uurb,
1337 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1338 arg);
1339 }
1340
processcompl_compat(struct async * as,void __user * __user * arg)1341 static int processcompl_compat(struct async *as, void __user * __user *arg)
1342 {
1343 struct urb *urb = as->urb;
1344 struct usbdevfs_urb32 __user *userurb = as->userurb;
1345 void __user *addr = as->userurb;
1346 unsigned int i;
1347
1348 if (as->userbuffer)
1349 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1350 urb->transfer_buffer_length))
1351 return -EFAULT;
1352 if (put_user(as->status, &userurb->status))
1353 return -EFAULT;
1354 if (put_user(urb->actual_length, &userurb->actual_length))
1355 return -EFAULT;
1356 if (put_user(urb->error_count, &userurb->error_count))
1357 return -EFAULT;
1358
1359 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1360 for (i = 0; i < urb->number_of_packets; i++) {
1361 if (put_user(urb->iso_frame_desc[i].actual_length,
1362 &userurb->iso_frame_desc[i].actual_length))
1363 return -EFAULT;
1364 if (put_user(urb->iso_frame_desc[i].status,
1365 &userurb->iso_frame_desc[i].status))
1366 return -EFAULT;
1367 }
1368 }
1369
1370 free_async(as);
1371 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1372 return -EFAULT;
1373 return 0;
1374 }
1375
proc_reapurb_compat(struct dev_state * ps,void __user * arg)1376 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1377 {
1378 struct async *as = reap_as(ps);
1379 if (as)
1380 return processcompl_compat(as, (void __user * __user *)arg);
1381 if (signal_pending(current))
1382 return -EINTR;
1383 return -EIO;
1384 }
1385
proc_reapurbnonblock_compat(struct dev_state * ps,void __user * arg)1386 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1387 {
1388 struct async *as;
1389
1390 if (!(as = async_getcompleted(ps)))
1391 return -EAGAIN;
1392 return processcompl_compat(as, (void __user * __user *)arg);
1393 }
1394
1395 #endif
1396
proc_disconnectsignal(struct dev_state * ps,void __user * arg)1397 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1398 {
1399 struct usbdevfs_disconnectsignal ds;
1400
1401 if (copy_from_user(&ds, arg, sizeof(ds)))
1402 return -EFAULT;
1403 ps->discsignr = ds.signr;
1404 ps->disccontext = ds.context;
1405 return 0;
1406 }
1407
proc_claiminterface(struct dev_state * ps,void __user * arg)1408 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1409 {
1410 unsigned int ifnum;
1411
1412 if (get_user(ifnum, (unsigned int __user *)arg))
1413 return -EFAULT;
1414 return claimintf(ps, ifnum);
1415 }
1416
proc_releaseinterface(struct dev_state * ps,void __user * arg)1417 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1418 {
1419 unsigned int ifnum;
1420 int ret;
1421
1422 if (get_user(ifnum, (unsigned int __user *)arg))
1423 return -EFAULT;
1424 if ((ret = releaseintf(ps, ifnum)) < 0)
1425 return ret;
1426 destroy_async_on_interface (ps, ifnum);
1427 return 0;
1428 }
1429
proc_ioctl(struct dev_state * ps,struct usbdevfs_ioctl * ctl)1430 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1431 {
1432 int size;
1433 void *buf = NULL;
1434 int retval = 0;
1435 struct usb_interface *intf = NULL;
1436 struct usb_driver *driver = NULL;
1437
1438 /* alloc buffer */
1439 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1440 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1441 return -ENOMEM;
1442 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1443 if (copy_from_user(buf, ctl->data, size)) {
1444 kfree(buf);
1445 return -EFAULT;
1446 }
1447 } else {
1448 memset(buf, 0, size);
1449 }
1450 }
1451
1452 if (!connected(ps)) {
1453 kfree(buf);
1454 return -ENODEV;
1455 }
1456
1457 if (ps->dev->state != USB_STATE_CONFIGURED)
1458 retval = -EHOSTUNREACH;
1459 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1460 retval = -EINVAL;
1461 else switch (ctl->ioctl_code) {
1462
1463 /* disconnect kernel driver from interface */
1464 case USBDEVFS_DISCONNECT:
1465 if (intf->dev.driver) {
1466 driver = to_usb_driver(intf->dev.driver);
1467 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1468 usb_driver_release_interface(driver, intf);
1469 } else
1470 retval = -ENODATA;
1471 break;
1472
1473 /* let kernel drivers try to (re)bind to the interface */
1474 case USBDEVFS_CONNECT:
1475 if (!intf->dev.driver)
1476 retval = device_attach(&intf->dev);
1477 else
1478 retval = -EBUSY;
1479 break;
1480
1481 /* talk directly to the interface's driver */
1482 default:
1483 if (intf->dev.driver)
1484 driver = to_usb_driver(intf->dev.driver);
1485 if (driver == NULL || driver->ioctl == NULL) {
1486 retval = -ENOTTY;
1487 } else {
1488 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1489 if (retval == -ENOIOCTLCMD)
1490 retval = -ENOTTY;
1491 }
1492 }
1493
1494 /* cleanup and return */
1495 if (retval >= 0
1496 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1497 && size > 0
1498 && copy_to_user(ctl->data, buf, size) != 0)
1499 retval = -EFAULT;
1500
1501 kfree(buf);
1502 return retval;
1503 }
1504
proc_ioctl_default(struct dev_state * ps,void __user * arg)1505 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1506 {
1507 struct usbdevfs_ioctl ctrl;
1508
1509 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1510 return -EFAULT;
1511 return proc_ioctl(ps, &ctrl);
1512 }
1513
1514 #ifdef CONFIG_COMPAT
proc_ioctl_compat(struct dev_state * ps,compat_uptr_t arg)1515 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1516 {
1517 struct usbdevfs_ioctl32 __user *uioc;
1518 struct usbdevfs_ioctl ctrl;
1519 u32 udata;
1520
1521 uioc = compat_ptr((long)arg);
1522 if (get_user(ctrl.ifno, &uioc->ifno) ||
1523 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1524 __get_user(udata, &uioc->data))
1525 return -EFAULT;
1526 ctrl.data = compat_ptr(udata);
1527
1528 return proc_ioctl(ps, &ctrl);
1529 }
1530 #endif
1531
1532 /*
1533 * NOTE: All requests here that have interface numbers as parameters
1534 * are assuming that somehow the configuration has been prevented from
1535 * changing. But there's no mechanism to ensure that...
1536 */
usbdev_ioctl(struct inode * inode,struct file * file,unsigned int cmd,unsigned long arg)1537 static int usbdev_ioctl(struct inode *inode, struct file *file,
1538 unsigned int cmd, unsigned long arg)
1539 {
1540 struct dev_state *ps = file->private_data;
1541 struct usb_device *dev = ps->dev;
1542 void __user *p = (void __user *)arg;
1543 int ret = -ENOTTY;
1544
1545 if (!(file->f_mode & FMODE_WRITE))
1546 return -EPERM;
1547 usb_lock_device(dev);
1548 if (!connected(ps)) {
1549 usb_unlock_device(dev);
1550 return -ENODEV;
1551 }
1552
1553 switch (cmd) {
1554 case USBDEVFS_CONTROL:
1555 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1556 ret = proc_control(ps, p);
1557 if (ret >= 0)
1558 inode->i_mtime = CURRENT_TIME;
1559 break;
1560
1561 case USBDEVFS_BULK:
1562 snoop(&dev->dev, "%s: BULK\n", __func__);
1563 ret = proc_bulk(ps, p);
1564 if (ret >= 0)
1565 inode->i_mtime = CURRENT_TIME;
1566 break;
1567
1568 case USBDEVFS_RESETEP:
1569 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1570 ret = proc_resetep(ps, p);
1571 if (ret >= 0)
1572 inode->i_mtime = CURRENT_TIME;
1573 break;
1574
1575 case USBDEVFS_RESET:
1576 snoop(&dev->dev, "%s: RESET\n", __func__);
1577 ret = proc_resetdevice(ps);
1578 break;
1579
1580 case USBDEVFS_CLEAR_HALT:
1581 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1582 ret = proc_clearhalt(ps, p);
1583 if (ret >= 0)
1584 inode->i_mtime = CURRENT_TIME;
1585 break;
1586
1587 case USBDEVFS_GETDRIVER:
1588 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1589 ret = proc_getdriver(ps, p);
1590 break;
1591
1592 case USBDEVFS_CONNECTINFO:
1593 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1594 ret = proc_connectinfo(ps, p);
1595 break;
1596
1597 case USBDEVFS_SETINTERFACE:
1598 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1599 ret = proc_setintf(ps, p);
1600 break;
1601
1602 case USBDEVFS_SETCONFIGURATION:
1603 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1604 ret = proc_setconfig(ps, p);
1605 break;
1606
1607 case USBDEVFS_SUBMITURB:
1608 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1609 ret = proc_submiturb(ps, p);
1610 if (ret >= 0)
1611 inode->i_mtime = CURRENT_TIME;
1612 break;
1613
1614 #ifdef CONFIG_COMPAT
1615
1616 case USBDEVFS_SUBMITURB32:
1617 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1618 ret = proc_submiturb_compat(ps, p);
1619 if (ret >= 0)
1620 inode->i_mtime = CURRENT_TIME;
1621 break;
1622
1623 case USBDEVFS_REAPURB32:
1624 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1625 ret = proc_reapurb_compat(ps, p);
1626 break;
1627
1628 case USBDEVFS_REAPURBNDELAY32:
1629 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1630 ret = proc_reapurbnonblock_compat(ps, p);
1631 break;
1632
1633 case USBDEVFS_IOCTL32:
1634 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1635 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1636 break;
1637 #endif
1638
1639 case USBDEVFS_DISCARDURB:
1640 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1641 ret = proc_unlinkurb(ps, p);
1642 break;
1643
1644 case USBDEVFS_REAPURB:
1645 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1646 ret = proc_reapurb(ps, p);
1647 break;
1648
1649 case USBDEVFS_REAPURBNDELAY:
1650 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1651 ret = proc_reapurbnonblock(ps, p);
1652 break;
1653
1654 case USBDEVFS_DISCSIGNAL:
1655 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1656 ret = proc_disconnectsignal(ps, p);
1657 break;
1658
1659 case USBDEVFS_CLAIMINTERFACE:
1660 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1661 ret = proc_claiminterface(ps, p);
1662 break;
1663
1664 case USBDEVFS_RELEASEINTERFACE:
1665 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1666 ret = proc_releaseinterface(ps, p);
1667 break;
1668
1669 case USBDEVFS_IOCTL:
1670 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1671 ret = proc_ioctl_default(ps, p);
1672 break;
1673 }
1674 usb_unlock_device(dev);
1675 if (ret >= 0)
1676 inode->i_atime = CURRENT_TIME;
1677 return ret;
1678 }
1679
1680 /* No kernel lock - fine */
usbdev_poll(struct file * file,struct poll_table_struct * wait)1681 static unsigned int usbdev_poll(struct file *file,
1682 struct poll_table_struct *wait)
1683 {
1684 struct dev_state *ps = file->private_data;
1685 unsigned int mask = 0;
1686
1687 poll_wait(file, &ps->wait, wait);
1688 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1689 mask |= POLLOUT | POLLWRNORM;
1690 if (!connected(ps))
1691 mask |= POLLERR | POLLHUP;
1692 return mask;
1693 }
1694
1695 const struct file_operations usbdev_file_operations = {
1696 .owner = THIS_MODULE,
1697 .llseek = usbdev_lseek,
1698 .read = usbdev_read,
1699 .poll = usbdev_poll,
1700 .ioctl = usbdev_ioctl,
1701 .open = usbdev_open,
1702 .release = usbdev_release,
1703 };
1704
usbdev_remove(struct usb_device * udev)1705 static void usbdev_remove(struct usb_device *udev)
1706 {
1707 struct dev_state *ps;
1708 struct siginfo sinfo;
1709
1710 while (!list_empty(&udev->filelist)) {
1711 ps = list_entry(udev->filelist.next, struct dev_state, list);
1712 destroy_all_async(ps);
1713 wake_up_all(&ps->wait);
1714 list_del_init(&ps->list);
1715 if (ps->discsignr) {
1716 sinfo.si_signo = ps->discsignr;
1717 sinfo.si_errno = EPIPE;
1718 sinfo.si_code = SI_ASYNCIO;
1719 sinfo.si_addr = ps->disccontext;
1720 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1721 ps->disc_pid, ps->disc_uid,
1722 ps->disc_euid, ps->secid);
1723 }
1724 }
1725 }
1726
1727 #ifdef CONFIG_USB_DEVICE_CLASS
1728 static struct class *usb_classdev_class;
1729
usb_classdev_add(struct usb_device * dev)1730 static int usb_classdev_add(struct usb_device *dev)
1731 {
1732 struct device *cldev;
1733
1734 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1735 NULL, "usbdev%d.%d", dev->bus->busnum,
1736 dev->devnum);
1737 if (IS_ERR(cldev))
1738 return PTR_ERR(cldev);
1739 dev->usb_classdev = cldev;
1740 return 0;
1741 }
1742
usb_classdev_remove(struct usb_device * dev)1743 static void usb_classdev_remove(struct usb_device *dev)
1744 {
1745 if (dev->usb_classdev)
1746 device_unregister(dev->usb_classdev);
1747 }
1748
1749 #else
1750 #define usb_classdev_add(dev) 0
1751 #define usb_classdev_remove(dev) do {} while (0)
1752
1753 #endif
1754
usbdev_notify(struct notifier_block * self,unsigned long action,void * dev)1755 static int usbdev_notify(struct notifier_block *self,
1756 unsigned long action, void *dev)
1757 {
1758 switch (action) {
1759 case USB_DEVICE_ADD:
1760 if (usb_classdev_add(dev))
1761 return NOTIFY_BAD;
1762 break;
1763 case USB_DEVICE_REMOVE:
1764 usb_classdev_remove(dev);
1765 usbdev_remove(dev);
1766 break;
1767 }
1768 return NOTIFY_OK;
1769 }
1770
1771 static struct notifier_block usbdev_nb = {
1772 .notifier_call = usbdev_notify,
1773 };
1774
1775 static struct cdev usb_device_cdev;
1776
usb_devio_init(void)1777 int __init usb_devio_init(void)
1778 {
1779 int retval;
1780
1781 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1782 "usb_device");
1783 if (retval) {
1784 printk(KERN_ERR "Unable to register minors for usb_device\n");
1785 goto out;
1786 }
1787 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1788 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1789 if (retval) {
1790 printk(KERN_ERR "Unable to get usb_device major %d\n",
1791 USB_DEVICE_MAJOR);
1792 goto error_cdev;
1793 }
1794 #ifdef CONFIG_USB_DEVICE_CLASS
1795 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1796 if (IS_ERR(usb_classdev_class)) {
1797 printk(KERN_ERR "Unable to register usb_device class\n");
1798 retval = PTR_ERR(usb_classdev_class);
1799 cdev_del(&usb_device_cdev);
1800 usb_classdev_class = NULL;
1801 goto out;
1802 }
1803 /* devices of this class shadow the major:minor of their parent
1804 * device, so clear ->dev_kobj to prevent adding duplicate entries
1805 * to /sys/dev
1806 */
1807 usb_classdev_class->dev_kobj = NULL;
1808 #endif
1809 usb_register_notify(&usbdev_nb);
1810 out:
1811 return retval;
1812
1813 error_cdev:
1814 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1815 goto out;
1816 }
1817
usb_devio_cleanup(void)1818 void usb_devio_cleanup(void)
1819 {
1820 usb_unregister_notify(&usbdev_nb);
1821 #ifdef CONFIG_USB_DEVICE_CLASS
1822 class_destroy(usb_classdev_class);
1823 #endif
1824 cdev_del(&usb_device_cdev);
1825 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1826 }
1827