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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/signal.h>
41#include <linux/poll.h>
42#include <linux/module.h>
43#include <linux/usb.h>
44#include <linux/usbdevice_fs.h>
45#include <linux/usb/hcd.h> /* for usbcore internals */
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 "usb.h"
54
55#define USB_MAXBUS 64
56#define USB_DEVICE_MAX USB_MAXBUS * 128
57
58/* Mutual exclusion for removal, open, and release */
59DEFINE_MUTEX(usbfs_mutex);
60
61struct dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 wait_queue_head_t wait; /* wake up if a request completed */
69 unsigned int discsignr;
70 struct pid *disc_pid;
71 uid_t disc_uid, disc_euid;
72 void __user *disccontext;
73 unsigned long ifclaimed;
74 u32 secid;
75 u32 disabled_bulk_eps;
76};
77
78struct 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 u8 bulk_addr;
91 u8 bulk_status;
92};
93
94static int usbfs_snoop;
95module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
96MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
97
98#define snoop(dev, format, arg...) \
99 do { \
100 if (usbfs_snoop) \
101 dev_info(dev , format , ## arg); \
102 } while (0)
103
104enum snoop_when {
105 SUBMIT, COMPLETE
106};
107
108#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
109
110#define MAX_USBFS_BUFFER_SIZE 16384
111
112
113static int connected(struct dev_state *ps)
114{
115 return (!list_empty(&ps->list) &&
116 ps->dev->state != USB_STATE_NOTATTACHED);
117}
118
119static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
120{
121 loff_t ret;
122
123 mutex_lock(&file->f_dentry->d_inode->i_mutex);
124
125 switch (orig) {
126 case 0:
127 file->f_pos = offset;
128 ret = file->f_pos;
129 break;
130 case 1:
131 file->f_pos += offset;
132 ret = file->f_pos;
133 break;
134 case 2:
135 default:
136 ret = -EINVAL;
137 }
138
139 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
140 return ret;
141}
142
143static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
144 loff_t *ppos)
145{
146 struct dev_state *ps = file->private_data;
147 struct usb_device *dev = ps->dev;
148 ssize_t ret = 0;
149 unsigned len;
150 loff_t pos;
151 int i;
152
153 pos = *ppos;
154 usb_lock_device(dev);
155 if (!connected(ps)) {
156 ret = -ENODEV;
157 goto err;
158 } else if (pos < 0) {
159 ret = -EINVAL;
160 goto err;
161 }
162
163 if (pos < sizeof(struct usb_device_descriptor)) {
164 /* 18 bytes - fits on the stack */
165 struct usb_device_descriptor temp_desc;
166
167 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
168 le16_to_cpus(&temp_desc.bcdUSB);
169 le16_to_cpus(&temp_desc.idVendor);
170 le16_to_cpus(&temp_desc.idProduct);
171 le16_to_cpus(&temp_desc.bcdDevice);
172
173 len = sizeof(struct usb_device_descriptor) - pos;
174 if (len > nbytes)
175 len = nbytes;
176 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
177 ret = -EFAULT;
178 goto err;
179 }
180
181 *ppos += len;
182 buf += len;
183 nbytes -= len;
184 ret += len;
185 }
186
187 pos = sizeof(struct usb_device_descriptor);
188 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
189 struct usb_config_descriptor *config =
190 (struct usb_config_descriptor *)dev->rawdescriptors[i];
191 unsigned int length = le16_to_cpu(config->wTotalLength);
192
193 if (*ppos < pos + length) {
194
195 /* The descriptor may claim to be longer than it
196 * really is. Here is the actual allocated length. */
197 unsigned alloclen =
198 le16_to_cpu(dev->config[i].desc.wTotalLength);
199
200 len = length - (*ppos - pos);
201 if (len > nbytes)
202 len = nbytes;
203
204 /* Simply don't write (skip over) unallocated parts */
205 if (alloclen > (*ppos - pos)) {
206 alloclen -= (*ppos - pos);
207 if (copy_to_user(buf,
208 dev->rawdescriptors[i] + (*ppos - pos),
209 min(len, alloclen))) {
210 ret = -EFAULT;
211 goto err;
212 }
213 }
214
215 *ppos += len;
216 buf += len;
217 nbytes -= len;
218 ret += len;
219 }
220
221 pos += length;
222 }
223
224err:
225 usb_unlock_device(dev);
226 return ret;
227}
228
229/*
230 * async list handling
231 */
232
233static struct async *alloc_async(unsigned int numisoframes)
234{
235 struct async *as;
236
237 as = kzalloc(sizeof(struct async), GFP_KERNEL);
238 if (!as)
239 return NULL;
240 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
241 if (!as->urb) {
242 kfree(as);
243 return NULL;
244 }
245 return as;
246}
247
248static void free_async(struct async *as)
249{
250 put_pid(as->pid);
251 kfree(as->urb->transfer_buffer);
252 kfree(as->urb->setup_packet);
253 usb_free_urb(as->urb);
254 kfree(as);
255}
256
257static void async_newpending(struct async *as)
258{
259 struct dev_state *ps = as->ps;
260 unsigned long flags;
261
262 spin_lock_irqsave(&ps->lock, flags);
263 list_add_tail(&as->asynclist, &ps->async_pending);
264 spin_unlock_irqrestore(&ps->lock, flags);
265}
266
267static void async_removepending(struct async *as)
268{
269 struct dev_state *ps = as->ps;
270 unsigned long flags;
271
272 spin_lock_irqsave(&ps->lock, flags);
273 list_del_init(&as->asynclist);
274 spin_unlock_irqrestore(&ps->lock, flags);
275}
276
277static struct async *async_getcompleted(struct dev_state *ps)
278{
279 unsigned long flags;
280 struct async *as = NULL;
281
282 spin_lock_irqsave(&ps->lock, flags);
283 if (!list_empty(&ps->async_completed)) {
284 as = list_entry(ps->async_completed.next, struct async,
285 asynclist);
286 list_del_init(&as->asynclist);
287 }
288 spin_unlock_irqrestore(&ps->lock, flags);
289 return as;
290}
291
292static struct async *async_getpending(struct dev_state *ps,
293 void __user *userurb)
294{
295 unsigned long flags;
296 struct async *as;
297
298 spin_lock_irqsave(&ps->lock, flags);
299 list_for_each_entry(as, &ps->async_pending, asynclist)
300 if (as->userurb == userurb) {
301 list_del_init(&as->asynclist);
302 spin_unlock_irqrestore(&ps->lock, flags);
303 return as;
304 }
305 spin_unlock_irqrestore(&ps->lock, flags);
306 return NULL;
307}
308
309static void snoop_urb(struct usb_device *udev,
310 void __user *userurb, int pipe, unsigned length,
311 int timeout_or_status, enum snoop_when when,
312 unsigned char *data, unsigned data_len)
313{
314 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
315 static const char *dirs[] = {"out", "in"};
316 int ep;
317 const char *t, *d;
318
319 if (!usbfs_snoop)
320 return;
321
322 ep = usb_pipeendpoint(pipe);
323 t = types[usb_pipetype(pipe)];
324 d = dirs[!!usb_pipein(pipe)];
325
326 if (userurb) { /* Async */
327 if (when == SUBMIT)
328 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
329 "length %u\n",
330 userurb, ep, t, d, length);
331 else
332 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
333 "actual_length %u status %d\n",
334 userurb, ep, t, d, length,
335 timeout_or_status);
336 } else {
337 if (when == SUBMIT)
338 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
339 "timeout %d\n",
340 ep, t, d, length, timeout_or_status);
341 else
342 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
343 "status %d\n",
344 ep, t, d, length, timeout_or_status);
345 }
346
347 if (data && data_len > 0) {
348 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
349 data, data_len, 1);
350 }
351}
352
353#define AS_CONTINUATION 1
354#define AS_UNLINK 2
355
356static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
357__releases(ps->lock)
358__acquires(ps->lock)
359{
360 struct async *as;
361
362 /* Mark all the pending URBs that match bulk_addr, up to but not
363 * including the first one without AS_CONTINUATION. If such an
364 * URB is encountered then a new transfer has already started so
365 * the endpoint doesn't need to be disabled; otherwise it does.
366 */
367 list_for_each_entry(as, &ps->async_pending, asynclist) {
368 if (as->bulk_addr == bulk_addr) {
369 if (as->bulk_status != AS_CONTINUATION)
370 goto rescan;
371 as->bulk_status = AS_UNLINK;
372 as->bulk_addr = 0;
373 }
374 }
375 ps->disabled_bulk_eps |= (1 << bulk_addr);
376
377 /* Now carefully unlink all the marked pending URBs */
378 rescan:
379 list_for_each_entry(as, &ps->async_pending, asynclist) {
380 if (as->bulk_status == AS_UNLINK) {
381 as->bulk_status = 0; /* Only once */
382 spin_unlock(&ps->lock); /* Allow completions */
383 usb_unlink_urb(as->urb);
384 spin_lock(&ps->lock);
385 goto rescan;
386 }
387 }
388}
389
390static void async_completed(struct urb *urb)
391{
392 struct async *as = urb->context;
393 struct dev_state *ps = as->ps;
394 struct siginfo sinfo;
395 struct pid *pid = NULL;
396 uid_t uid = 0;
397 uid_t euid = 0;
398 u32 secid = 0;
399 int signr;
400
401 spin_lock(&ps->lock);
402 list_move_tail(&as->asynclist, &ps->async_completed);
403 as->status = urb->status;
404 signr = as->signr;
405 if (signr) {
406 sinfo.si_signo = as->signr;
407 sinfo.si_errno = as->status;
408 sinfo.si_code = SI_ASYNCIO;
409 sinfo.si_addr = as->userurb;
410 pid = as->pid;
411 uid = as->uid;
412 euid = as->euid;
413 secid = as->secid;
414 }
415 snoop(&urb->dev->dev, "urb complete\n");
416 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
417 as->status, COMPLETE,
418 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
419 NULL : urb->transfer_buffer, urb->actual_length);
420 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
421 as->status != -ENOENT)
422 cancel_bulk_urbs(ps, as->bulk_addr);
423 spin_unlock(&ps->lock);
424
425 if (signr)
426 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
427 euid, secid);
428
429 wake_up(&ps->wait);
430}
431
432static void destroy_async(struct dev_state *ps, struct list_head *list)
433{
434 struct async *as;
435 unsigned long flags;
436
437 spin_lock_irqsave(&ps->lock, flags);
438 while (!list_empty(list)) {
439 as = list_entry(list->next, struct async, asynclist);
440 list_del_init(&as->asynclist);
441
442 /* drop the spinlock so the completion handler can run */
443 spin_unlock_irqrestore(&ps->lock, flags);
444 usb_kill_urb(as->urb);
445 spin_lock_irqsave(&ps->lock, flags);
446 }
447 spin_unlock_irqrestore(&ps->lock, flags);
448}
449
450static void destroy_async_on_interface(struct dev_state *ps,
451 unsigned int ifnum)
452{
453 struct list_head *p, *q, hitlist;
454 unsigned long flags;
455
456 INIT_LIST_HEAD(&hitlist);
457 spin_lock_irqsave(&ps->lock, flags);
458 list_for_each_safe(p, q, &ps->async_pending)
459 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
460 list_move_tail(p, &hitlist);
461 spin_unlock_irqrestore(&ps->lock, flags);
462 destroy_async(ps, &hitlist);
463}
464
465static void destroy_all_async(struct dev_state *ps)
466{
467 destroy_async(ps, &ps->async_pending);
468}
469
470/*
471 * interface claims are made only at the request of user level code,
472 * which can also release them (explicitly or by closing files).
473 * they're also undone when devices disconnect.
474 */
475
476static int driver_probe(struct usb_interface *intf,
477 const struct usb_device_id *id)
478{
479 return -ENODEV;
480}
481
482static void driver_disconnect(struct usb_interface *intf)
483{
484 struct dev_state *ps = usb_get_intfdata(intf);
485 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
486
487 if (!ps)
488 return;
489
490 /* NOTE: this relies on usbcore having canceled and completed
491 * all pending I/O requests; 2.6 does that.
492 */
493
494 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
495 clear_bit(ifnum, &ps->ifclaimed);
496 else
497 dev_warn(&intf->dev, "interface number %u out of range\n",
498 ifnum);
499
500 usb_set_intfdata(intf, NULL);
501
502 /* force async requests to complete */
503 destroy_async_on_interface(ps, ifnum);
504}
505
506/* The following routines are merely placeholders. There is no way
507 * to inform a user task about suspend or resumes.
508 */
509static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
510{
511 return 0;
512}
513
514static int driver_resume(struct usb_interface *intf)
515{
516 return 0;
517}
518
519struct usb_driver usbfs_driver = {
520 .name = "usbfs",
521 .probe = driver_probe,
522 .disconnect = driver_disconnect,
523 .suspend = driver_suspend,
524 .resume = driver_resume,
525};
526
527static int claimintf(struct dev_state *ps, unsigned int ifnum)
528{
529 struct usb_device *dev = ps->dev;
530 struct usb_interface *intf;
531 int err;
532
533 if (ifnum >= 8*sizeof(ps->ifclaimed))
534 return -EINVAL;
535 /* already claimed */
536 if (test_bit(ifnum, &ps->ifclaimed))
537 return 0;
538
539 intf = usb_ifnum_to_if(dev, ifnum);
540 if (!intf)
541 err = -ENOENT;
542 else
543 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
544 if (err == 0)
545 set_bit(ifnum, &ps->ifclaimed);
546 return err;
547}
548
549static int releaseintf(struct dev_state *ps, unsigned int ifnum)
550{
551 struct usb_device *dev;
552 struct usb_interface *intf;
553 int err;
554
555 err = -EINVAL;
556 if (ifnum >= 8*sizeof(ps->ifclaimed))
557 return err;
558 dev = ps->dev;
559 intf = usb_ifnum_to_if(dev, ifnum);
560 if (!intf)
561 err = -ENOENT;
562 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
563 usb_driver_release_interface(&usbfs_driver, intf);
564 err = 0;
565 }
566 return err;
567}
568
569static int checkintf(struct dev_state *ps, unsigned int ifnum)
570{
571 if (ps->dev->state != USB_STATE_CONFIGURED)
572 return -EHOSTUNREACH;
573 if (ifnum >= 8*sizeof(ps->ifclaimed))
574 return -EINVAL;
575 if (test_bit(ifnum, &ps->ifclaimed))
576 return 0;
577 /* if not yet claimed, claim it for the driver */
578 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
579 "interface %u before use\n", task_pid_nr(current),
580 current->comm, ifnum);
581 return claimintf(ps, ifnum);
582}
583
584static int findintfep(struct usb_device *dev, unsigned int ep)
585{
586 unsigned int i, j, e;
587 struct usb_interface *intf;
588 struct usb_host_interface *alts;
589 struct usb_endpoint_descriptor *endpt;
590
591 if (ep & ~(USB_DIR_IN|0xf))
592 return -EINVAL;
593 if (!dev->actconfig)
594 return -ESRCH;
595 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
596 intf = dev->actconfig->interface[i];
597 for (j = 0; j < intf->num_altsetting; j++) {
598 alts = &intf->altsetting[j];
599 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
600 endpt = &alts->endpoint[e].desc;
601 if (endpt->bEndpointAddress == ep)
602 return alts->desc.bInterfaceNumber;
603 }
604 }
605 }
606 return -ENOENT;
607}
608
609static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
610 unsigned int index)
611{
612 int ret = 0;
613
614 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
615 && ps->dev->state != USB_STATE_ADDRESS
616 && ps->dev->state != USB_STATE_CONFIGURED)
617 return -EHOSTUNREACH;
618 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
619 return 0;
620
621 index &= 0xff;
622 switch (requesttype & USB_RECIP_MASK) {
623 case USB_RECIP_ENDPOINT:
624 ret = findintfep(ps->dev, index);
625 if (ret >= 0)
626 ret = checkintf(ps, ret);
627 break;
628
629 case USB_RECIP_INTERFACE:
630 ret = checkintf(ps, index);
631 break;
632 }
633 return ret;
634}
635
636static int match_devt(struct device *dev, void *data)
637{
638 return dev->devt == (dev_t) (unsigned long) data;
639}
640
641static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
642{
643 struct device *dev;
644
645 dev = bus_find_device(&usb_bus_type, NULL,
646 (void *) (unsigned long) devt, match_devt);
647 if (!dev)
648 return NULL;
649 return container_of(dev, struct usb_device, dev);
650}
651
652/*
653 * file operations
654 */
655static int usbdev_open(struct inode *inode, struct file *file)
656{
657 struct usb_device *dev = NULL;
658 struct dev_state *ps;
659 const struct cred *cred = current_cred();
660 int ret;
661
662 ret = -ENOMEM;
663 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
664 if (!ps)
665 goto out_free_ps;
666
667 ret = -ENODEV;
668
669 /* Protect against simultaneous removal or release */
670 mutex_lock(&usbfs_mutex);
671
672 /* usbdev device-node */
673 if (imajor(inode) == USB_DEVICE_MAJOR)
674 dev = usbdev_lookup_by_devt(inode->i_rdev);
675
676#ifdef CONFIG_USB_DEVICEFS
677 /* procfs file */
678 if (!dev) {
679 dev = inode->i_private;
680 if (dev && dev->usbfs_dentry &&
681 dev->usbfs_dentry->d_inode == inode)
682 usb_get_dev(dev);
683 else
684 dev = NULL;
685 }
686#endif
687 mutex_unlock(&usbfs_mutex);
688
689 if (!dev)
690 goto out_free_ps;
691
692 usb_lock_device(dev);
693 if (dev->state == USB_STATE_NOTATTACHED)
694 goto out_unlock_device;
695
696 ret = usb_autoresume_device(dev);
697 if (ret)
698 goto out_unlock_device;
699
700 ps->dev = dev;
701 ps->file = file;
702 spin_lock_init(&ps->lock);
703 INIT_LIST_HEAD(&ps->list);
704 INIT_LIST_HEAD(&ps->async_pending);
705 INIT_LIST_HEAD(&ps->async_completed);
706 init_waitqueue_head(&ps->wait);
707 ps->discsignr = 0;
708 ps->disc_pid = get_pid(task_pid(current));
709 ps->disc_uid = cred->uid;
710 ps->disc_euid = cred->euid;
711 ps->disccontext = NULL;
712 ps->ifclaimed = 0;
713 security_task_getsecid(current, &ps->secid);
714 smp_wmb();
715 list_add_tail(&ps->list, &dev->filelist);
716 file->private_data = ps;
717 usb_unlock_device(dev);
718 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
719 current->comm);
720 return ret;
721
722 out_unlock_device:
723 usb_unlock_device(dev);
724 usb_put_dev(dev);
725 out_free_ps:
726 kfree(ps);
727 return ret;
728}
729
730static int usbdev_release(struct inode *inode, struct file *file)
731{
732 struct dev_state *ps = file->private_data;
733 struct usb_device *dev = ps->dev;
734 unsigned int ifnum;
735 struct async *as;
736
737 usb_lock_device(dev);
738 usb_hub_release_all_ports(dev, ps);
739
740 list_del_init(&ps->list);
741
742 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
743 ifnum++) {
744 if (test_bit(ifnum, &ps->ifclaimed))
745 releaseintf(ps, ifnum);
746 }
747 destroy_all_async(ps);
748 usb_autosuspend_device(dev);
749 usb_unlock_device(dev);
750 usb_put_dev(dev);
751 put_pid(ps->disc_pid);
752
753 as = async_getcompleted(ps);
754 while (as) {
755 free_async(as);
756 as = async_getcompleted(ps);
757 }
758 kfree(ps);
759 return 0;
760}
761
762static int proc_control(struct dev_state *ps, void __user *arg)
763{
764 struct usb_device *dev = ps->dev;
765 struct usbdevfs_ctrltransfer ctrl;
766 unsigned int tmo;
767 unsigned char *tbuf;
768 unsigned wLength;
769 int i, pipe, ret;
770
771 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
772 return -EFAULT;
773 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
774 if (ret)
775 return ret;
776 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
777 if (wLength > PAGE_SIZE)
778 return -EINVAL;
779 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
780 if (!tbuf)
781 return -ENOMEM;
782 tmo = ctrl.timeout;
783 snoop(&dev->dev, "control urb: bRequestType=%02x "
784 "bRequest=%02x wValue=%04x "
785 "wIndex=%04x wLength=%04x\n",
786 ctrl.bRequestType, ctrl.bRequest,
787 __le16_to_cpup(&ctrl.wValue),
788 __le16_to_cpup(&ctrl.wIndex),
789 __le16_to_cpup(&ctrl.wLength));
790 if (ctrl.bRequestType & 0x80) {
791 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
792 ctrl.wLength)) {
793 free_page((unsigned long)tbuf);
794 return -EINVAL;
795 }
796 pipe = usb_rcvctrlpipe(dev, 0);
797 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
798
799 usb_unlock_device(dev);
800 i = usb_control_msg(dev, pipe, ctrl.bRequest,
801 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
802 tbuf, ctrl.wLength, tmo);
803 usb_lock_device(dev);
804 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
805 tbuf, max(i, 0));
806 if ((i > 0) && ctrl.wLength) {
807 if (copy_to_user(ctrl.data, tbuf, i)) {
808 free_page((unsigned long)tbuf);
809 return -EFAULT;
810 }
811 }
812 } else {
813 if (ctrl.wLength) {
814 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
815 free_page((unsigned long)tbuf);
816 return -EFAULT;
817 }
818 }
819 pipe = usb_sndctrlpipe(dev, 0);
820 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
821 tbuf, ctrl.wLength);
822
823 usb_unlock_device(dev);
824 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
825 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
826 tbuf, ctrl.wLength, tmo);
827 usb_lock_device(dev);
828 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
829 }
830 free_page((unsigned long)tbuf);
831 if (i < 0 && i != -EPIPE) {
832 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
833 "failed cmd %s rqt %u rq %u len %u ret %d\n",
834 current->comm, ctrl.bRequestType, ctrl.bRequest,
835 ctrl.wLength, i);
836 }
837 return i;
838}
839
840static int proc_bulk(struct dev_state *ps, void __user *arg)
841{
842 struct usb_device *dev = ps->dev;
843 struct usbdevfs_bulktransfer bulk;
844 unsigned int tmo, len1, pipe;
845 int len2;
846 unsigned char *tbuf;
847 int i, ret;
848
849 if (copy_from_user(&bulk, arg, sizeof(bulk)))
850 return -EFAULT;
851 ret = findintfep(ps->dev, bulk.ep);
852 if (ret < 0)
853 return ret;
854 ret = checkintf(ps, ret);
855 if (ret)
856 return ret;
857 if (bulk.ep & USB_DIR_IN)
858 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
859 else
860 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
861 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
862 return -EINVAL;
863 len1 = bulk.len;
864 if (len1 > MAX_USBFS_BUFFER_SIZE)
865 return -EINVAL;
866 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
867 return -ENOMEM;
868 tmo = bulk.timeout;
869 if (bulk.ep & 0x80) {
870 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
871 kfree(tbuf);
872 return -EINVAL;
873 }
874 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
875
876 usb_unlock_device(dev);
877 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
878 usb_lock_device(dev);
879 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
880
881 if (!i && len2) {
882 if (copy_to_user(bulk.data, tbuf, len2)) {
883 kfree(tbuf);
884 return -EFAULT;
885 }
886 }
887 } else {
888 if (len1) {
889 if (copy_from_user(tbuf, bulk.data, len1)) {
890 kfree(tbuf);
891 return -EFAULT;
892 }
893 }
894 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
895
896 usb_unlock_device(dev);
897 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
898 usb_lock_device(dev);
899 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
900 }
901 kfree(tbuf);
902 if (i < 0)
903 return i;
904 return len2;
905}
906
907static int proc_resetep(struct dev_state *ps, void __user *arg)
908{
909 unsigned int ep;
910 int ret;
911
912 if (get_user(ep, (unsigned int __user *)arg))
913 return -EFAULT;
914 ret = findintfep(ps->dev, ep);
915 if (ret < 0)
916 return ret;
917 ret = checkintf(ps, ret);
918 if (ret)
919 return ret;
920 usb_reset_endpoint(ps->dev, ep);
921 return 0;
922}
923
924static int proc_clearhalt(struct dev_state *ps, void __user *arg)
925{
926 unsigned int ep;
927 int pipe;
928 int ret;
929
930 if (get_user(ep, (unsigned int __user *)arg))
931 return -EFAULT;
932 ret = findintfep(ps->dev, ep);
933 if (ret < 0)
934 return ret;
935 ret = checkintf(ps, ret);
936 if (ret)
937 return ret;
938 if (ep & USB_DIR_IN)
939 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
940 else
941 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
942
943 return usb_clear_halt(ps->dev, pipe);
944}
945
946static int proc_getdriver(struct dev_state *ps, void __user *arg)
947{
948 struct usbdevfs_getdriver gd;
949 struct usb_interface *intf;
950 int ret;
951
952 if (copy_from_user(&gd, arg, sizeof(gd)))
953 return -EFAULT;
954 intf = usb_ifnum_to_if(ps->dev, gd.interface);
955 if (!intf || !intf->dev.driver)
956 ret = -ENODATA;
957 else {
958 strncpy(gd.driver, intf->dev.driver->name,
959 sizeof(gd.driver));
960 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
961 }
962 return ret;
963}
964
965static int proc_connectinfo(struct dev_state *ps, void __user *arg)
966{
967 struct usbdevfs_connectinfo ci = {
968 .devnum = ps->dev->devnum,
969 .slow = ps->dev->speed == USB_SPEED_LOW
970 };
971
972 if (copy_to_user(arg, &ci, sizeof(ci)))
973 return -EFAULT;
974 return 0;
975}
976
977static int proc_resetdevice(struct dev_state *ps)
978{
979 return usb_reset_device(ps->dev);
980}
981
982static int proc_setintf(struct dev_state *ps, void __user *arg)
983{
984 struct usbdevfs_setinterface setintf;
985 int ret;
986
987 if (copy_from_user(&setintf, arg, sizeof(setintf)))
988 return -EFAULT;
989 if ((ret = checkintf(ps, setintf.interface)))
990 return ret;
991 return usb_set_interface(ps->dev, setintf.interface,
992 setintf.altsetting);
993}
994
995static int proc_setconfig(struct dev_state *ps, void __user *arg)
996{
997 int u;
998 int status = 0;
999 struct usb_host_config *actconfig;
1000
1001 if (get_user(u, (int __user *)arg))
1002 return -EFAULT;
1003
1004 actconfig = ps->dev->actconfig;
1005
1006 /* Don't touch the device if any interfaces are claimed.
1007 * It could interfere with other drivers' operations, and if
1008 * an interface is claimed by usbfs it could easily deadlock.
1009 */
1010 if (actconfig) {
1011 int i;
1012
1013 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1014 if (usb_interface_claimed(actconfig->interface[i])) {
1015 dev_warn(&ps->dev->dev,
1016 "usbfs: interface %d claimed by %s "
1017 "while '%s' sets config #%d\n",
1018 actconfig->interface[i]
1019 ->cur_altsetting
1020 ->desc.bInterfaceNumber,
1021 actconfig->interface[i]
1022 ->dev.driver->name,
1023 current->comm, u);
1024 status = -EBUSY;
1025 break;
1026 }
1027 }
1028 }
1029
1030 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1031 * so avoid usb_set_configuration()'s kick to sysfs
1032 */
1033 if (status == 0) {
1034 if (actconfig && actconfig->desc.bConfigurationValue == u)
1035 status = usb_reset_configuration(ps->dev);
1036 else
1037 status = usb_set_configuration(ps->dev, u);
1038 }
1039
1040 return status;
1041}
1042
1043static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1044 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1045 void __user *arg)
1046{
1047 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1048 struct usb_host_endpoint *ep;
1049 struct async *as;
1050 struct usb_ctrlrequest *dr = NULL;
1051 const struct cred *cred = current_cred();
1052 unsigned int u, totlen, isofrmlen;
1053 int ret, ifnum = -1;
1054 int is_in;
1055
1056 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1057 USBDEVFS_URB_SHORT_NOT_OK |
1058 USBDEVFS_URB_BULK_CONTINUATION |
1059 USBDEVFS_URB_NO_FSBR |
1060 USBDEVFS_URB_ZERO_PACKET |
1061 USBDEVFS_URB_NO_INTERRUPT))
1062 return -EINVAL;
1063 if (uurb->buffer_length > 0 && !uurb->buffer)
1064 return -EINVAL;
1065 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1066 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1067 ifnum = findintfep(ps->dev, uurb->endpoint);
1068 if (ifnum < 0)
1069 return ifnum;
1070 ret = checkintf(ps, ifnum);
1071 if (ret)
1072 return ret;
1073 }
1074 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1075 is_in = 1;
1076 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1077 } else {
1078 is_in = 0;
1079 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1080 }
1081 if (!ep)
1082 return -ENOENT;
1083 switch(uurb->type) {
1084 case USBDEVFS_URB_TYPE_CONTROL:
1085 if (!usb_endpoint_xfer_control(&ep->desc))
1086 return -EINVAL;
1087 /* min 8 byte setup packet,
1088 * max 8 byte setup plus an arbitrary data stage */
1089 if (uurb->buffer_length < 8 ||
1090 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1091 return -EINVAL;
1092 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1093 if (!dr)
1094 return -ENOMEM;
1095 if (copy_from_user(dr, uurb->buffer, 8)) {
1096 kfree(dr);
1097 return -EFAULT;
1098 }
1099 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1100 kfree(dr);
1101 return -EINVAL;
1102 }
1103 ret = check_ctrlrecip(ps, dr->bRequestType,
1104 le16_to_cpup(&dr->wIndex));
1105 if (ret) {
1106 kfree(dr);
1107 return ret;
1108 }
1109 uurb->number_of_packets = 0;
1110 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1111 uurb->buffer += 8;
1112 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1113 is_in = 1;
1114 uurb->endpoint |= USB_DIR_IN;
1115 } else {
1116 is_in = 0;
1117 uurb->endpoint &= ~USB_DIR_IN;
1118 }
1119 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1120 "bRequest=%02x wValue=%04x "
1121 "wIndex=%04x wLength=%04x\n",
1122 dr->bRequestType, dr->bRequest,
1123 __le16_to_cpup(&dr->wValue),
1124 __le16_to_cpup(&dr->wIndex),
1125 __le16_to_cpup(&dr->wLength));
1126 break;
1127
1128 case USBDEVFS_URB_TYPE_BULK:
1129 switch (usb_endpoint_type(&ep->desc)) {
1130 case USB_ENDPOINT_XFER_CONTROL:
1131 case USB_ENDPOINT_XFER_ISOC:
1132 return -EINVAL;
1133 case USB_ENDPOINT_XFER_INT:
1134 /* allow single-shot interrupt transfers */
1135 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1136 goto interrupt_urb;
1137 }
1138 uurb->number_of_packets = 0;
1139 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1140 return -EINVAL;
1141 break;
1142
1143 case USBDEVFS_URB_TYPE_INTERRUPT:
1144 if (!usb_endpoint_xfer_int(&ep->desc))
1145 return -EINVAL;
1146 interrupt_urb:
1147 uurb->number_of_packets = 0;
1148 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1149 return -EINVAL;
1150 break;
1151
1152 case USBDEVFS_URB_TYPE_ISO:
1153 /* arbitrary limit */
1154 if (uurb->number_of_packets < 1 ||
1155 uurb->number_of_packets > 128)
1156 return -EINVAL;
1157 if (!usb_endpoint_xfer_isoc(&ep->desc))
1158 return -EINVAL;
1159 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1160 uurb->number_of_packets;
1161 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1162 return -ENOMEM;
1163 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1164 kfree(isopkt);
1165 return -EFAULT;
1166 }
1167 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1168 /* arbitrary limit,
1169 * sufficient for USB 2.0 high-bandwidth iso */
1170 if (isopkt[u].length > 8192) {
1171 kfree(isopkt);
1172 return -EINVAL;
1173 }
1174 totlen += isopkt[u].length;
1175 }
1176 /* 3072 * 64 microframes */
1177 if (totlen > 196608) {
1178 kfree(isopkt);
1179 return -EINVAL;
1180 }
1181 uurb->buffer_length = totlen;
1182 break;
1183
1184 default:
1185 return -EINVAL;
1186 }
1187 if (uurb->buffer_length > 0 &&
1188 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1189 uurb->buffer, uurb->buffer_length)) {
1190 kfree(isopkt);
1191 kfree(dr);
1192 return -EFAULT;
1193 }
1194 as = alloc_async(uurb->number_of_packets);
1195 if (!as) {
1196 kfree(isopkt);
1197 kfree(dr);
1198 return -ENOMEM;
1199 }
1200 if (uurb->buffer_length > 0) {
1201 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1202 GFP_KERNEL);
1203 if (!as->urb->transfer_buffer) {
1204 kfree(isopkt);
1205 kfree(dr);
1206 free_async(as);
1207 return -ENOMEM;
1208 }
1209 /* Isochronous input data may end up being discontiguous
1210 * if some of the packets are short. Clear the buffer so
1211 * that the gaps don't leak kernel data to userspace.
1212 */
1213 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1214 memset(as->urb->transfer_buffer, 0,
1215 uurb->buffer_length);
1216 }
1217 as->urb->dev = ps->dev;
1218 as->urb->pipe = (uurb->type << 30) |
1219 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1220 (uurb->endpoint & USB_DIR_IN);
1221
1222 /* This tedious sequence is necessary because the URB_* flags
1223 * are internal to the kernel and subject to change, whereas
1224 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1225 */
1226 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1227 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1228 u |= URB_ISO_ASAP;
1229 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1230 u |= URB_SHORT_NOT_OK;
1231 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1232 u |= URB_NO_FSBR;
1233 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1234 u |= URB_ZERO_PACKET;
1235 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1236 u |= URB_NO_INTERRUPT;
1237 as->urb->transfer_flags = u;
1238
1239 as->urb->transfer_buffer_length = uurb->buffer_length;
1240 as->urb->setup_packet = (unsigned char *)dr;
1241 as->urb->start_frame = uurb->start_frame;
1242 as->urb->number_of_packets = uurb->number_of_packets;
1243 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1244 ps->dev->speed == USB_SPEED_HIGH)
1245 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1246 else
1247 as->urb->interval = ep->desc.bInterval;
1248 as->urb->context = as;
1249 as->urb->complete = async_completed;
1250 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1251 as->urb->iso_frame_desc[u].offset = totlen;
1252 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1253 totlen += isopkt[u].length;
1254 }
1255 kfree(isopkt);
1256 as->ps = ps;
1257 as->userurb = arg;
1258 if (is_in && uurb->buffer_length > 0)
1259 as->userbuffer = uurb->buffer;
1260 else
1261 as->userbuffer = NULL;
1262 as->signr = uurb->signr;
1263 as->ifnum = ifnum;
1264 as->pid = get_pid(task_pid(current));
1265 as->uid = cred->uid;
1266 as->euid = cred->euid;
1267 security_task_getsecid(current, &as->secid);
1268 if (!is_in && uurb->buffer_length > 0) {
1269 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1270 uurb->buffer_length)) {
1271 free_async(as);
1272 return -EFAULT;
1273 }
1274 }
1275 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1276 as->urb->transfer_buffer_length, 0, SUBMIT,
1277 is_in ? NULL : as->urb->transfer_buffer,
1278 uurb->buffer_length);
1279 async_newpending(as);
1280
1281 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1282 spin_lock_irq(&ps->lock);
1283
1284 /* Not exactly the endpoint address; the direction bit is
1285 * shifted to the 0x10 position so that the value will be
1286 * between 0 and 31.
1287 */
1288 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1289 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1290 >> 3);
1291
1292 /* If this bulk URB is the start of a new transfer, re-enable
1293 * the endpoint. Otherwise mark it as a continuation URB.
1294 */
1295 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1296 as->bulk_status = AS_CONTINUATION;
1297 else
1298 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1299
1300 /* Don't accept continuation URBs if the endpoint is
1301 * disabled because of an earlier error.
1302 */
1303 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1304 ret = -EREMOTEIO;
1305 else
1306 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1307 spin_unlock_irq(&ps->lock);
1308 } else {
1309 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1310 }
1311
1312 if (ret) {
1313 dev_printk(KERN_DEBUG, &ps->dev->dev,
1314 "usbfs: usb_submit_urb returned %d\n", ret);
1315 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1316 0, ret, COMPLETE, NULL, 0);
1317 async_removepending(as);
1318 free_async(as);
1319 return ret;
1320 }
1321 return 0;
1322}
1323
1324static int proc_submiturb(struct dev_state *ps, void __user *arg)
1325{
1326 struct usbdevfs_urb uurb;
1327
1328 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1329 return -EFAULT;
1330
1331 return proc_do_submiturb(ps, &uurb,
1332 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1333 arg);
1334}
1335
1336static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1337{
1338 struct async *as;
1339
1340 as = async_getpending(ps, arg);
1341 if (!as)
1342 return -EINVAL;
1343 usb_kill_urb(as->urb);
1344 return 0;
1345}
1346
1347static int processcompl(struct async *as, void __user * __user *arg)
1348{
1349 struct urb *urb = as->urb;
1350 struct usbdevfs_urb __user *userurb = as->userurb;
1351 void __user *addr = as->userurb;
1352 unsigned int i;
1353
1354 if (as->userbuffer && urb->actual_length) {
1355 if (urb->number_of_packets > 0) /* Isochronous */
1356 i = urb->transfer_buffer_length;
1357 else /* Non-Isoc */
1358 i = urb->actual_length;
1359 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1360 goto err_out;
1361 }
1362 if (put_user(as->status, &userurb->status))
1363 goto err_out;
1364 if (put_user(urb->actual_length, &userurb->actual_length))
1365 goto err_out;
1366 if (put_user(urb->error_count, &userurb->error_count))
1367 goto err_out;
1368
1369 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1370 for (i = 0; i < urb->number_of_packets; i++) {
1371 if (put_user(urb->iso_frame_desc[i].actual_length,
1372 &userurb->iso_frame_desc[i].actual_length))
1373 goto err_out;
1374 if (put_user(urb->iso_frame_desc[i].status,
1375 &userurb->iso_frame_desc[i].status))
1376 goto err_out;
1377 }
1378 }
1379
1380 if (put_user(addr, (void __user * __user *)arg))
1381 return -EFAULT;
1382 return 0;
1383
1384err_out:
1385 return -EFAULT;
1386}
1387
1388static struct async *reap_as(struct dev_state *ps)
1389{
1390 DECLARE_WAITQUEUE(wait, current);
1391 struct async *as = NULL;
1392 struct usb_device *dev = ps->dev;
1393
1394 add_wait_queue(&ps->wait, &wait);
1395 for (;;) {
1396 __set_current_state(TASK_INTERRUPTIBLE);
1397 as = async_getcompleted(ps);
1398 if (as)
1399 break;
1400 if (signal_pending(current))
1401 break;
1402 usb_unlock_device(dev);
1403 schedule();
1404 usb_lock_device(dev);
1405 }
1406 remove_wait_queue(&ps->wait, &wait);
1407 set_current_state(TASK_RUNNING);
1408 return as;
1409}
1410
1411static int proc_reapurb(struct dev_state *ps, void __user *arg)
1412{
1413 struct async *as = reap_as(ps);
1414 if (as) {
1415 int retval = processcompl(as, (void __user * __user *)arg);
1416 free_async(as);
1417 return retval;
1418 }
1419 if (signal_pending(current))
1420 return -EINTR;
1421 return -EIO;
1422}
1423
1424static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1425{
1426 int retval;
1427 struct async *as;
1428
1429 as = async_getcompleted(ps);
1430 retval = -EAGAIN;
1431 if (as) {
1432 retval = processcompl(as, (void __user * __user *)arg);
1433 free_async(as);
1434 }
1435 return retval;
1436}
1437
1438#ifdef CONFIG_COMPAT
1439static int proc_control_compat(struct dev_state *ps,
1440 struct usbdevfs_ctrltransfer32 __user *p32)
1441{
1442 struct usbdevfs_ctrltransfer __user *p;
1443 __u32 udata;
1444 p = compat_alloc_user_space(sizeof(*p));
1445 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1446 get_user(udata, &p32->data) ||
1447 put_user(compat_ptr(udata), &p->data))
1448 return -EFAULT;
1449 return proc_control(ps, p);
1450}
1451
1452static int proc_bulk_compat(struct dev_state *ps,
1453 struct usbdevfs_bulktransfer32 __user *p32)
1454{
1455 struct usbdevfs_bulktransfer __user *p;
1456 compat_uint_t n;
1457 compat_caddr_t addr;
1458
1459 p = compat_alloc_user_space(sizeof(*p));
1460
1461 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1462 get_user(n, &p32->len) || put_user(n, &p->len) ||
1463 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1464 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1465 return -EFAULT;
1466
1467 return proc_bulk(ps, p);
1468}
1469static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1470{
1471 struct usbdevfs_disconnectsignal32 ds;
1472
1473 if (copy_from_user(&ds, arg, sizeof(ds)))
1474 return -EFAULT;
1475 ps->discsignr = ds.signr;
1476 ps->disccontext = compat_ptr(ds.context);
1477 return 0;
1478}
1479
1480static int get_urb32(struct usbdevfs_urb *kurb,
1481 struct usbdevfs_urb32 __user *uurb)
1482{
1483 __u32 uptr;
1484 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1485 __get_user(kurb->type, &uurb->type) ||
1486 __get_user(kurb->endpoint, &uurb->endpoint) ||
1487 __get_user(kurb->status, &uurb->status) ||
1488 __get_user(kurb->flags, &uurb->flags) ||
1489 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1490 __get_user(kurb->actual_length, &uurb->actual_length) ||
1491 __get_user(kurb->start_frame, &uurb->start_frame) ||
1492 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1493 __get_user(kurb->error_count, &uurb->error_count) ||
1494 __get_user(kurb->signr, &uurb->signr))
1495 return -EFAULT;
1496
1497 if (__get_user(uptr, &uurb->buffer))
1498 return -EFAULT;
1499 kurb->buffer = compat_ptr(uptr);
1500 if (__get_user(uptr, &uurb->usercontext))
1501 return -EFAULT;
1502 kurb->usercontext = compat_ptr(uptr);
1503
1504 return 0;
1505}
1506
1507static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1508{
1509 struct usbdevfs_urb uurb;
1510
1511 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1512 return -EFAULT;
1513
1514 return proc_do_submiturb(ps, &uurb,
1515 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1516 arg);
1517}
1518
1519static int processcompl_compat(struct async *as, void __user * __user *arg)
1520{
1521 struct urb *urb = as->urb;
1522 struct usbdevfs_urb32 __user *userurb = as->userurb;
1523 void __user *addr = as->userurb;
1524 unsigned int i;
1525
1526 if (as->userbuffer && urb->actual_length)
1527 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1528 urb->actual_length))
1529 return -EFAULT;
1530 if (put_user(as->status, &userurb->status))
1531 return -EFAULT;
1532 if (put_user(urb->actual_length, &userurb->actual_length))
1533 return -EFAULT;
1534 if (put_user(urb->error_count, &userurb->error_count))
1535 return -EFAULT;
1536
1537 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1538 for (i = 0; i < urb->number_of_packets; i++) {
1539 if (put_user(urb->iso_frame_desc[i].actual_length,
1540 &userurb->iso_frame_desc[i].actual_length))
1541 return -EFAULT;
1542 if (put_user(urb->iso_frame_desc[i].status,
1543 &userurb->iso_frame_desc[i].status))
1544 return -EFAULT;
1545 }
1546 }
1547
1548 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1549 return -EFAULT;
1550 return 0;
1551}
1552
1553static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1554{
1555 struct async *as = reap_as(ps);
1556 if (as) {
1557 int retval = processcompl_compat(as, (void __user * __user *)arg);
1558 free_async(as);
1559 return retval;
1560 }
1561 if (signal_pending(current))
1562 return -EINTR;
1563 return -EIO;
1564}
1565
1566static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1567{
1568 int retval;
1569 struct async *as;
1570
1571 retval = -EAGAIN;
1572 as = async_getcompleted(ps);
1573 if (as) {
1574 retval = processcompl_compat(as, (void __user * __user *)arg);
1575 free_async(as);
1576 }
1577 return retval;
1578}
1579
1580
1581#endif
1582
1583static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1584{
1585 struct usbdevfs_disconnectsignal ds;
1586
1587 if (copy_from_user(&ds, arg, sizeof(ds)))
1588 return -EFAULT;
1589 ps->discsignr = ds.signr;
1590 ps->disccontext = ds.context;
1591 return 0;
1592}
1593
1594static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1595{
1596 unsigned int ifnum;
1597
1598 if (get_user(ifnum, (unsigned int __user *)arg))
1599 return -EFAULT;
1600 return claimintf(ps, ifnum);
1601}
1602
1603static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1604{
1605 unsigned int ifnum;
1606 int ret;
1607
1608 if (get_user(ifnum, (unsigned int __user *)arg))
1609 return -EFAULT;
1610 if ((ret = releaseintf(ps, ifnum)) < 0)
1611 return ret;
1612 destroy_async_on_interface (ps, ifnum);
1613 return 0;
1614}
1615
1616static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1617{
1618 int size;
1619 void *buf = NULL;
1620 int retval = 0;
1621 struct usb_interface *intf = NULL;
1622 struct usb_driver *driver = NULL;
1623
1624 /* alloc buffer */
1625 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1626 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1627 return -ENOMEM;
1628 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1629 if (copy_from_user(buf, ctl->data, size)) {
1630 kfree(buf);
1631 return -EFAULT;
1632 }
1633 } else {
1634 memset(buf, 0, size);
1635 }
1636 }
1637
1638 if (!connected(ps)) {
1639 kfree(buf);
1640 return -ENODEV;
1641 }
1642
1643 if (ps->dev->state != USB_STATE_CONFIGURED)
1644 retval = -EHOSTUNREACH;
1645 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1646 retval = -EINVAL;
1647 else switch (ctl->ioctl_code) {
1648
1649 /* disconnect kernel driver from interface */
1650 case USBDEVFS_DISCONNECT:
1651 if (intf->dev.driver) {
1652 driver = to_usb_driver(intf->dev.driver);
1653 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1654 usb_driver_release_interface(driver, intf);
1655 } else
1656 retval = -ENODATA;
1657 break;
1658
1659 /* let kernel drivers try to (re)bind to the interface */
1660 case USBDEVFS_CONNECT:
1661 if (!intf->dev.driver)
1662 retval = device_attach(&intf->dev);
1663 else
1664 retval = -EBUSY;
1665 break;
1666
1667 /* talk directly to the interface's driver */
1668 default:
1669 if (intf->dev.driver)
1670 driver = to_usb_driver(intf->dev.driver);
1671 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1672 retval = -ENOTTY;
1673 } else {
1674 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1675 if (retval == -ENOIOCTLCMD)
1676 retval = -ENOTTY;
1677 }
1678 }
1679
1680 /* cleanup and return */
1681 if (retval >= 0
1682 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1683 && size > 0
1684 && copy_to_user(ctl->data, buf, size) != 0)
1685 retval = -EFAULT;
1686
1687 kfree(buf);
1688 return retval;
1689}
1690
1691static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1692{
1693 struct usbdevfs_ioctl ctrl;
1694
1695 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1696 return -EFAULT;
1697 return proc_ioctl(ps, &ctrl);
1698}
1699
1700#ifdef CONFIG_COMPAT
1701static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1702{
1703 struct usbdevfs_ioctl32 __user *uioc;
1704 struct usbdevfs_ioctl ctrl;
1705 u32 udata;
1706
1707 uioc = compat_ptr((long)arg);
1708 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1709 __get_user(ctrl.ifno, &uioc->ifno) ||
1710 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1711 __get_user(udata, &uioc->data))
1712 return -EFAULT;
1713 ctrl.data = compat_ptr(udata);
1714
1715 return proc_ioctl(ps, &ctrl);
1716}
1717#endif
1718
1719static int proc_claim_port(struct dev_state *ps, void __user *arg)
1720{
1721 unsigned portnum;
1722 int rc;
1723
1724 if (get_user(portnum, (unsigned __user *) arg))
1725 return -EFAULT;
1726 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1727 if (rc == 0)
1728 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1729 portnum, task_pid_nr(current), current->comm);
1730 return rc;
1731}
1732
1733static int proc_release_port(struct dev_state *ps, void __user *arg)
1734{
1735 unsigned portnum;
1736
1737 if (get_user(portnum, (unsigned __user *) arg))
1738 return -EFAULT;
1739 return usb_hub_release_port(ps->dev, portnum, ps);
1740}
1741
1742/*
1743 * NOTE: All requests here that have interface numbers as parameters
1744 * are assuming that somehow the configuration has been prevented from
1745 * changing. But there's no mechanism to ensure that...
1746 */
1747static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1748 void __user *p)
1749{
1750 struct dev_state *ps = file->private_data;
1751 struct inode *inode = file->f_path.dentry->d_inode;
1752 struct usb_device *dev = ps->dev;
1753 int ret = -ENOTTY;
1754
1755 if (!(file->f_mode & FMODE_WRITE))
1756 return -EPERM;
1757
1758 usb_lock_device(dev);
1759 if (!connected(ps)) {
1760 usb_unlock_device(dev);
1761 return -ENODEV;
1762 }
1763
1764 switch (cmd) {
1765 case USBDEVFS_CONTROL:
1766 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1767 ret = proc_control(ps, p);
1768 if (ret >= 0)
1769 inode->i_mtime = CURRENT_TIME;
1770 break;
1771
1772 case USBDEVFS_BULK:
1773 snoop(&dev->dev, "%s: BULK\n", __func__);
1774 ret = proc_bulk(ps, p);
1775 if (ret >= 0)
1776 inode->i_mtime = CURRENT_TIME;
1777 break;
1778
1779 case USBDEVFS_RESETEP:
1780 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1781 ret = proc_resetep(ps, p);
1782 if (ret >= 0)
1783 inode->i_mtime = CURRENT_TIME;
1784 break;
1785
1786 case USBDEVFS_RESET:
1787 snoop(&dev->dev, "%s: RESET\n", __func__);
1788 ret = proc_resetdevice(ps);
1789 break;
1790
1791 case USBDEVFS_CLEAR_HALT:
1792 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1793 ret = proc_clearhalt(ps, p);
1794 if (ret >= 0)
1795 inode->i_mtime = CURRENT_TIME;
1796 break;
1797
1798 case USBDEVFS_GETDRIVER:
1799 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1800 ret = proc_getdriver(ps, p);
1801 break;
1802
1803 case USBDEVFS_CONNECTINFO:
1804 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1805 ret = proc_connectinfo(ps, p);
1806 break;
1807
1808 case USBDEVFS_SETINTERFACE:
1809 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1810 ret = proc_setintf(ps, p);
1811 break;
1812
1813 case USBDEVFS_SETCONFIGURATION:
1814 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1815 ret = proc_setconfig(ps, p);
1816 break;
1817
1818 case USBDEVFS_SUBMITURB:
1819 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1820 ret = proc_submiturb(ps, p);
1821 if (ret >= 0)
1822 inode->i_mtime = CURRENT_TIME;
1823 break;
1824
1825#ifdef CONFIG_COMPAT
1826 case USBDEVFS_CONTROL32:
1827 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1828 ret = proc_control_compat(ps, p);
1829 if (ret >= 0)
1830 inode->i_mtime = CURRENT_TIME;
1831 break;
1832
1833 case USBDEVFS_BULK32:
1834 snoop(&dev->dev, "%s: BULK32\n", __func__);
1835 ret = proc_bulk_compat(ps, p);
1836 if (ret >= 0)
1837 inode->i_mtime = CURRENT_TIME;
1838 break;
1839
1840 case USBDEVFS_DISCSIGNAL32:
1841 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1842 ret = proc_disconnectsignal_compat(ps, p);
1843 break;
1844
1845 case USBDEVFS_SUBMITURB32:
1846 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1847 ret = proc_submiturb_compat(ps, p);
1848 if (ret >= 0)
1849 inode->i_mtime = CURRENT_TIME;
1850 break;
1851
1852 case USBDEVFS_REAPURB32:
1853 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1854 ret = proc_reapurb_compat(ps, p);
1855 break;
1856
1857 case USBDEVFS_REAPURBNDELAY32:
1858 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1859 ret = proc_reapurbnonblock_compat(ps, p);
1860 break;
1861
1862 case USBDEVFS_IOCTL32:
1863 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1864 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1865 break;
1866#endif
1867
1868 case USBDEVFS_DISCARDURB:
1869 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1870 ret = proc_unlinkurb(ps, p);
1871 break;
1872
1873 case USBDEVFS_REAPURB:
1874 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1875 ret = proc_reapurb(ps, p);
1876 break;
1877
1878 case USBDEVFS_REAPURBNDELAY:
1879 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1880 ret = proc_reapurbnonblock(ps, p);
1881 break;
1882
1883 case USBDEVFS_DISCSIGNAL:
1884 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1885 ret = proc_disconnectsignal(ps, p);
1886 break;
1887
1888 case USBDEVFS_CLAIMINTERFACE:
1889 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1890 ret = proc_claiminterface(ps, p);
1891 break;
1892
1893 case USBDEVFS_RELEASEINTERFACE:
1894 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1895 ret = proc_releaseinterface(ps, p);
1896 break;
1897
1898 case USBDEVFS_IOCTL:
1899 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1900 ret = proc_ioctl_default(ps, p);
1901 break;
1902
1903 case USBDEVFS_CLAIM_PORT:
1904 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1905 ret = proc_claim_port(ps, p);
1906 break;
1907
1908 case USBDEVFS_RELEASE_PORT:
1909 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1910 ret = proc_release_port(ps, p);
1911 break;
1912 }
1913 usb_unlock_device(dev);
1914 if (ret >= 0)
1915 inode->i_atime = CURRENT_TIME;
1916 return ret;
1917}
1918
1919static long usbdev_ioctl(struct file *file, unsigned int cmd,
1920 unsigned long arg)
1921{
1922 int ret;
1923
1924 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
1925
1926 return ret;
1927}
1928
1929#ifdef CONFIG_COMPAT
1930static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
1931 unsigned long arg)
1932{
1933 int ret;
1934
1935 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
1936
1937 return ret;
1938}
1939#endif
1940
1941/* No kernel lock - fine */
1942static unsigned int usbdev_poll(struct file *file,
1943 struct poll_table_struct *wait)
1944{
1945 struct dev_state *ps = file->private_data;
1946 unsigned int mask = 0;
1947
1948 poll_wait(file, &ps->wait, wait);
1949 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1950 mask |= POLLOUT | POLLWRNORM;
1951 if (!connected(ps))
1952 mask |= POLLERR | POLLHUP;
1953 return mask;
1954}
1955
1956const struct file_operations usbdev_file_operations = {
1957 .owner = THIS_MODULE,
1958 .llseek = usbdev_lseek,
1959 .read = usbdev_read,
1960 .poll = usbdev_poll,
1961 .unlocked_ioctl = usbdev_ioctl,
1962#ifdef CONFIG_COMPAT
1963 .compat_ioctl = usbdev_compat_ioctl,
1964#endif
1965 .open = usbdev_open,
1966 .release = usbdev_release,
1967};
1968
1969static void usbdev_remove(struct usb_device *udev)
1970{
1971 struct dev_state *ps;
1972 struct siginfo sinfo;
1973
1974 while (!list_empty(&udev->filelist)) {
1975 ps = list_entry(udev->filelist.next, struct dev_state, list);
1976 destroy_all_async(ps);
1977 wake_up_all(&ps->wait);
1978 list_del_init(&ps->list);
1979 if (ps->discsignr) {
1980 sinfo.si_signo = ps->discsignr;
1981 sinfo.si_errno = EPIPE;
1982 sinfo.si_code = SI_ASYNCIO;
1983 sinfo.si_addr = ps->disccontext;
1984 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1985 ps->disc_pid, ps->disc_uid,
1986 ps->disc_euid, ps->secid);
1987 }
1988 }
1989}
1990
1991#ifdef CONFIG_USB_DEVICE_CLASS
1992static struct class *usb_classdev_class;
1993
1994static int usb_classdev_add(struct usb_device *dev)
1995{
1996 struct device *cldev;
1997
1998 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1999 NULL, "usbdev%d.%d", dev->bus->busnum,
2000 dev->devnum);
2001 if (IS_ERR(cldev))
2002 return PTR_ERR(cldev);
2003 dev->usb_classdev = cldev;
2004 return 0;
2005}
2006
2007static void usb_classdev_remove(struct usb_device *dev)
2008{
2009 if (dev->usb_classdev)
2010 device_unregister(dev->usb_classdev);
2011}
2012
2013#else
2014#define usb_classdev_add(dev) 0
2015#define usb_classdev_remove(dev) do {} while (0)
2016
2017#endif
2018
2019static int usbdev_notify(struct notifier_block *self,
2020 unsigned long action, void *dev)
2021{
2022 switch (action) {
2023 case USB_DEVICE_ADD:
2024 if (usb_classdev_add(dev))
2025 return NOTIFY_BAD;
2026 break;
2027 case USB_DEVICE_REMOVE:
2028 usb_classdev_remove(dev);
2029 usbdev_remove(dev);
2030 break;
2031 }
2032 return NOTIFY_OK;
2033}
2034
2035static struct notifier_block usbdev_nb = {
2036 .notifier_call = usbdev_notify,
2037};
2038
2039static struct cdev usb_device_cdev;
2040
2041int __init usb_devio_init(void)
2042{
2043 int retval;
2044
2045 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2046 "usb_device");
2047 if (retval) {
2048 printk(KERN_ERR "Unable to register minors for usb_device\n");
2049 goto out;
2050 }
2051 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2052 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2053 if (retval) {
2054 printk(KERN_ERR "Unable to get usb_device major %d\n",
2055 USB_DEVICE_MAJOR);
2056 goto error_cdev;
2057 }
2058#ifdef CONFIG_USB_DEVICE_CLASS
2059 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
2060 if (IS_ERR(usb_classdev_class)) {
2061 printk(KERN_ERR "Unable to register usb_device class\n");
2062 retval = PTR_ERR(usb_classdev_class);
2063 cdev_del(&usb_device_cdev);
2064 usb_classdev_class = NULL;
2065 goto out;
2066 }
2067 /* devices of this class shadow the major:minor of their parent
2068 * device, so clear ->dev_kobj to prevent adding duplicate entries
2069 * to /sys/dev
2070 */
2071 usb_classdev_class->dev_kobj = NULL;
2072#endif
2073 usb_register_notify(&usbdev_nb);
2074out:
2075 return retval;
2076
2077error_cdev:
2078 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2079 goto out;
2080}
2081
2082void usb_devio_cleanup(void)
2083{
2084 usb_unregister_notify(&usbdev_nb);
2085#ifdef CONFIG_USB_DEVICE_CLASS
2086 class_destroy(usb_classdev_class);
2087#endif
2088 cdev_del(&usb_device_cdev);
2089 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2090}
1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22/*****************************************************************************/
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched/signal.h>
27#include <linux/slab.h>
28#include <linux/signal.h>
29#include <linux/poll.h>
30#include <linux/module.h>
31#include <linux/string.h>
32#include <linux/usb.h>
33#include <linux/usbdevice_fs.h>
34#include <linux/usb/hcd.h> /* for usbcore internals */
35#include <linux/usb/quirks.h>
36#include <linux/cdev.h>
37#include <linux/notifier.h>
38#include <linux/security.h>
39#include <linux/user_namespace.h>
40#include <linux/scatterlist.h>
41#include <linux/uaccess.h>
42#include <linux/dma-mapping.h>
43#include <asm/byteorder.h>
44#include <linux/moduleparam.h>
45
46#include "usb.h"
47
48#ifdef CONFIG_PM
49#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50#else
51#define MAYBE_CAP_SUSPEND 0
52#endif
53
54#define USB_MAXBUS 64
55#define USB_DEVICE_MAX (USB_MAXBUS * 128)
56#define USB_SG_SIZE 16384 /* split-size for large txs */
57
58/* Mutual exclusion for ps->list in resume vs. release and remove */
59static DEFINE_MUTEX(usbfs_mutex);
60
61struct usb_dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 struct list_head memory_list;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 const struct cred *cred;
74 sigval_t disccontext;
75 unsigned long ifclaimed;
76 u32 disabled_bulk_eps;
77 unsigned long interface_allowed_mask;
78 int not_yet_resumed;
79 bool suspend_allowed;
80 bool privileges_dropped;
81};
82
83struct usb_memory {
84 struct list_head memlist;
85 int vma_use_count;
86 int urb_use_count;
87 u32 size;
88 void *mem;
89 dma_addr_t dma_handle;
90 unsigned long vm_start;
91 struct usb_dev_state *ps;
92};
93
94struct async {
95 struct list_head asynclist;
96 struct usb_dev_state *ps;
97 struct pid *pid;
98 const struct cred *cred;
99 unsigned int signr;
100 unsigned int ifnum;
101 void __user *userbuffer;
102 void __user *userurb;
103 sigval_t userurb_sigval;
104 struct urb *urb;
105 struct usb_memory *usbm;
106 unsigned int mem_usage;
107 int status;
108 u8 bulk_addr;
109 u8 bulk_status;
110};
111
112static bool usbfs_snoop;
113module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
114MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116static unsigned usbfs_snoop_max = 65536;
117module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(usbfs_snoop_max,
119 "maximum number of bytes to print while snooping");
120
121#define snoop(dev, format, arg...) \
122 do { \
123 if (usbfs_snoop) \
124 dev_info(dev, format, ## arg); \
125 } while (0)
126
127enum snoop_when {
128 SUBMIT, COMPLETE
129};
130
131#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133/* Limit on the total amount of memory we can allocate for transfers */
134static u32 usbfs_memory_mb = 16;
135module_param(usbfs_memory_mb, uint, 0644);
136MODULE_PARM_DESC(usbfs_memory_mb,
137 "maximum MB allowed for usbfs buffers (0 = no limit)");
138
139/* Hard limit, necessary to avoid arithmetic overflow */
140#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145/* Check whether it's okay to allocate more memory for a transfer */
146static int usbfs_increase_memory_usage(u64 amount)
147{
148 u64 lim, total_mem;
149 unsigned long flags;
150 int ret;
151
152 lim = READ_ONCE(usbfs_memory_mb);
153 lim <<= 20;
154
155 ret = 0;
156 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157 total_mem = usbfs_memory_usage + amount;
158 if (lim > 0 && total_mem > lim)
159 ret = -ENOMEM;
160 else
161 usbfs_memory_usage = total_mem;
162 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164 return ret;
165}
166
167/* Memory for a transfer is being deallocated */
168static void usbfs_decrease_memory_usage(u64 amount)
169{
170 unsigned long flags;
171
172 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173 if (amount > usbfs_memory_usage)
174 usbfs_memory_usage = 0;
175 else
176 usbfs_memory_usage -= amount;
177 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178}
179
180static int connected(struct usb_dev_state *ps)
181{
182 return (!list_empty(&ps->list) &&
183 ps->dev->state != USB_STATE_NOTATTACHED);
184}
185
186static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
187{
188 struct usb_dev_state *ps = usbm->ps;
189 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
190 unsigned long flags;
191
192 spin_lock_irqsave(&ps->lock, flags);
193 --*count;
194 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
195 list_del(&usbm->memlist);
196 spin_unlock_irqrestore(&ps->lock, flags);
197
198 hcd_buffer_free_pages(hcd, usbm->size,
199 usbm->mem, usbm->dma_handle);
200 usbfs_decrease_memory_usage(
201 usbm->size + sizeof(struct usb_memory));
202 kfree(usbm);
203 } else {
204 spin_unlock_irqrestore(&ps->lock, flags);
205 }
206}
207
208static void usbdev_vm_open(struct vm_area_struct *vma)
209{
210 struct usb_memory *usbm = vma->vm_private_data;
211 unsigned long flags;
212
213 spin_lock_irqsave(&usbm->ps->lock, flags);
214 ++usbm->vma_use_count;
215 spin_unlock_irqrestore(&usbm->ps->lock, flags);
216}
217
218static void usbdev_vm_close(struct vm_area_struct *vma)
219{
220 struct usb_memory *usbm = vma->vm_private_data;
221
222 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
223}
224
225static const struct vm_operations_struct usbdev_vm_ops = {
226 .open = usbdev_vm_open,
227 .close = usbdev_vm_close
228};
229
230static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
231{
232 struct usb_memory *usbm = NULL;
233 struct usb_dev_state *ps = file->private_data;
234 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
235 size_t size = vma->vm_end - vma->vm_start;
236 void *mem;
237 unsigned long flags;
238 dma_addr_t dma_handle = DMA_MAPPING_ERROR;
239 int ret;
240
241 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
242 if (ret)
243 goto error;
244
245 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
246 if (!usbm) {
247 ret = -ENOMEM;
248 goto error_decrease_mem;
249 }
250
251 mem = hcd_buffer_alloc_pages(hcd,
252 size, GFP_USER | __GFP_NOWARN, &dma_handle);
253 if (!mem) {
254 ret = -ENOMEM;
255 goto error_free_usbm;
256 }
257
258 memset(mem, 0, size);
259
260 usbm->mem = mem;
261 usbm->dma_handle = dma_handle;
262 usbm->size = size;
263 usbm->ps = ps;
264 usbm->vm_start = vma->vm_start;
265 usbm->vma_use_count = 1;
266 INIT_LIST_HEAD(&usbm->memlist);
267
268 /*
269 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
270 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
271 * whether we are in such cases, and then use remap_pfn_range (or
272 * dma_mmap_coherent) to map normal (or DMA) pages into the user
273 * space, respectively.
274 */
275 if (dma_handle == DMA_MAPPING_ERROR) {
276 if (remap_pfn_range(vma, vma->vm_start,
277 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
278 size, vma->vm_page_prot) < 0) {
279 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
280 return -EAGAIN;
281 }
282 } else {
283 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
284 size)) {
285 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
286 return -EAGAIN;
287 }
288 }
289
290 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
291 vma->vm_ops = &usbdev_vm_ops;
292 vma->vm_private_data = usbm;
293
294 spin_lock_irqsave(&ps->lock, flags);
295 list_add_tail(&usbm->memlist, &ps->memory_list);
296 spin_unlock_irqrestore(&ps->lock, flags);
297
298 return 0;
299
300error_free_usbm:
301 kfree(usbm);
302error_decrease_mem:
303 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
304error:
305 return ret;
306}
307
308static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
309 loff_t *ppos)
310{
311 struct usb_dev_state *ps = file->private_data;
312 struct usb_device *dev = ps->dev;
313 ssize_t ret = 0;
314 unsigned len;
315 loff_t pos;
316 int i;
317
318 pos = *ppos;
319 usb_lock_device(dev);
320 if (!connected(ps)) {
321 ret = -ENODEV;
322 goto err;
323 } else if (pos < 0) {
324 ret = -EINVAL;
325 goto err;
326 }
327
328 if (pos < sizeof(struct usb_device_descriptor)) {
329 /* 18 bytes - fits on the stack */
330 struct usb_device_descriptor temp_desc;
331
332 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
333 le16_to_cpus(&temp_desc.bcdUSB);
334 le16_to_cpus(&temp_desc.idVendor);
335 le16_to_cpus(&temp_desc.idProduct);
336 le16_to_cpus(&temp_desc.bcdDevice);
337
338 len = sizeof(struct usb_device_descriptor) - pos;
339 if (len > nbytes)
340 len = nbytes;
341 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
342 ret = -EFAULT;
343 goto err;
344 }
345
346 *ppos += len;
347 buf += len;
348 nbytes -= len;
349 ret += len;
350 }
351
352 pos = sizeof(struct usb_device_descriptor);
353 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
354 struct usb_config_descriptor *config =
355 (struct usb_config_descriptor *)dev->rawdescriptors[i];
356 unsigned int length = le16_to_cpu(config->wTotalLength);
357
358 if (*ppos < pos + length) {
359
360 /* The descriptor may claim to be longer than it
361 * really is. Here is the actual allocated length. */
362 unsigned alloclen =
363 le16_to_cpu(dev->config[i].desc.wTotalLength);
364
365 len = length - (*ppos - pos);
366 if (len > nbytes)
367 len = nbytes;
368
369 /* Simply don't write (skip over) unallocated parts */
370 if (alloclen > (*ppos - pos)) {
371 alloclen -= (*ppos - pos);
372 if (copy_to_user(buf,
373 dev->rawdescriptors[i] + (*ppos - pos),
374 min(len, alloclen))) {
375 ret = -EFAULT;
376 goto err;
377 }
378 }
379
380 *ppos += len;
381 buf += len;
382 nbytes -= len;
383 ret += len;
384 }
385
386 pos += length;
387 }
388
389err:
390 usb_unlock_device(dev);
391 return ret;
392}
393
394/*
395 * async list handling
396 */
397
398static struct async *alloc_async(unsigned int numisoframes)
399{
400 struct async *as;
401
402 as = kzalloc(sizeof(struct async), GFP_KERNEL);
403 if (!as)
404 return NULL;
405 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
406 if (!as->urb) {
407 kfree(as);
408 return NULL;
409 }
410 return as;
411}
412
413static void free_async(struct async *as)
414{
415 int i;
416
417 put_pid(as->pid);
418 if (as->cred)
419 put_cred(as->cred);
420 for (i = 0; i < as->urb->num_sgs; i++) {
421 if (sg_page(&as->urb->sg[i]))
422 kfree(sg_virt(&as->urb->sg[i]));
423 }
424
425 kfree(as->urb->sg);
426 if (as->usbm == NULL)
427 kfree(as->urb->transfer_buffer);
428 else
429 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
430
431 kfree(as->urb->setup_packet);
432 usb_free_urb(as->urb);
433 usbfs_decrease_memory_usage(as->mem_usage);
434 kfree(as);
435}
436
437static void async_newpending(struct async *as)
438{
439 struct usb_dev_state *ps = as->ps;
440 unsigned long flags;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 list_add_tail(&as->asynclist, &ps->async_pending);
444 spin_unlock_irqrestore(&ps->lock, flags);
445}
446
447static void async_removepending(struct async *as)
448{
449 struct usb_dev_state *ps = as->ps;
450 unsigned long flags;
451
452 spin_lock_irqsave(&ps->lock, flags);
453 list_del_init(&as->asynclist);
454 spin_unlock_irqrestore(&ps->lock, flags);
455}
456
457static struct async *async_getcompleted(struct usb_dev_state *ps)
458{
459 unsigned long flags;
460 struct async *as = NULL;
461
462 spin_lock_irqsave(&ps->lock, flags);
463 if (!list_empty(&ps->async_completed)) {
464 as = list_entry(ps->async_completed.next, struct async,
465 asynclist);
466 list_del_init(&as->asynclist);
467 }
468 spin_unlock_irqrestore(&ps->lock, flags);
469 return as;
470}
471
472static struct async *async_getpending(struct usb_dev_state *ps,
473 void __user *userurb)
474{
475 struct async *as;
476
477 list_for_each_entry(as, &ps->async_pending, asynclist)
478 if (as->userurb == userurb) {
479 list_del_init(&as->asynclist);
480 return as;
481 }
482
483 return NULL;
484}
485
486static void snoop_urb(struct usb_device *udev,
487 void __user *userurb, int pipe, unsigned length,
488 int timeout_or_status, enum snoop_when when,
489 unsigned char *data, unsigned data_len)
490{
491 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
492 static const char *dirs[] = {"out", "in"};
493 int ep;
494 const char *t, *d;
495
496 if (!usbfs_snoop)
497 return;
498
499 ep = usb_pipeendpoint(pipe);
500 t = types[usb_pipetype(pipe)];
501 d = dirs[!!usb_pipein(pipe)];
502
503 if (userurb) { /* Async */
504 if (when == SUBMIT)
505 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
506 "length %u\n",
507 userurb, ep, t, d, length);
508 else
509 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
510 "actual_length %u status %d\n",
511 userurb, ep, t, d, length,
512 timeout_or_status);
513 } else {
514 if (when == SUBMIT)
515 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
516 "timeout %d\n",
517 ep, t, d, length, timeout_or_status);
518 else
519 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
520 "status %d\n",
521 ep, t, d, length, timeout_or_status);
522 }
523
524 data_len = min(data_len, usbfs_snoop_max);
525 if (data && data_len > 0) {
526 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
527 data, data_len, 1);
528 }
529}
530
531static void snoop_urb_data(struct urb *urb, unsigned len)
532{
533 int i, size;
534
535 len = min(len, usbfs_snoop_max);
536 if (!usbfs_snoop || len == 0)
537 return;
538
539 if (urb->num_sgs == 0) {
540 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
541 urb->transfer_buffer, len, 1);
542 return;
543 }
544
545 for (i = 0; i < urb->num_sgs && len; i++) {
546 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
547 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
548 sg_virt(&urb->sg[i]), size, 1);
549 len -= size;
550 }
551}
552
553static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
554{
555 unsigned i, len, size;
556
557 if (urb->number_of_packets > 0) /* Isochronous */
558 len = urb->transfer_buffer_length;
559 else /* Non-Isoc */
560 len = urb->actual_length;
561
562 if (urb->num_sgs == 0) {
563 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
564 return -EFAULT;
565 return 0;
566 }
567
568 for (i = 0; i < urb->num_sgs && len; i++) {
569 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
570 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
571 return -EFAULT;
572 userbuffer += size;
573 len -= size;
574 }
575
576 return 0;
577}
578
579#define AS_CONTINUATION 1
580#define AS_UNLINK 2
581
582static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
583__releases(ps->lock)
584__acquires(ps->lock)
585{
586 struct urb *urb;
587 struct async *as;
588
589 /* Mark all the pending URBs that match bulk_addr, up to but not
590 * including the first one without AS_CONTINUATION. If such an
591 * URB is encountered then a new transfer has already started so
592 * the endpoint doesn't need to be disabled; otherwise it does.
593 */
594 list_for_each_entry(as, &ps->async_pending, asynclist) {
595 if (as->bulk_addr == bulk_addr) {
596 if (as->bulk_status != AS_CONTINUATION)
597 goto rescan;
598 as->bulk_status = AS_UNLINK;
599 as->bulk_addr = 0;
600 }
601 }
602 ps->disabled_bulk_eps |= (1 << bulk_addr);
603
604 /* Now carefully unlink all the marked pending URBs */
605 rescan:
606 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
607 if (as->bulk_status == AS_UNLINK) {
608 as->bulk_status = 0; /* Only once */
609 urb = as->urb;
610 usb_get_urb(urb);
611 spin_unlock(&ps->lock); /* Allow completions */
612 usb_unlink_urb(urb);
613 usb_put_urb(urb);
614 spin_lock(&ps->lock);
615 goto rescan;
616 }
617 }
618}
619
620static void async_completed(struct urb *urb)
621{
622 struct async *as = urb->context;
623 struct usb_dev_state *ps = as->ps;
624 struct pid *pid = NULL;
625 const struct cred *cred = NULL;
626 unsigned long flags;
627 sigval_t addr;
628 int signr, errno;
629
630 spin_lock_irqsave(&ps->lock, flags);
631 list_move_tail(&as->asynclist, &ps->async_completed);
632 as->status = urb->status;
633 signr = as->signr;
634 if (signr) {
635 errno = as->status;
636 addr = as->userurb_sigval;
637 pid = get_pid(as->pid);
638 cred = get_cred(as->cred);
639 }
640 snoop(&urb->dev->dev, "urb complete\n");
641 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
642 as->status, COMPLETE, NULL, 0);
643 if (usb_urb_dir_in(urb))
644 snoop_urb_data(urb, urb->actual_length);
645
646 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
647 as->status != -ENOENT)
648 cancel_bulk_urbs(ps, as->bulk_addr);
649
650 wake_up(&ps->wait);
651 spin_unlock_irqrestore(&ps->lock, flags);
652
653 if (signr) {
654 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
655 put_pid(pid);
656 put_cred(cred);
657 }
658}
659
660static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
661{
662 struct urb *urb;
663 struct async *as;
664 unsigned long flags;
665
666 spin_lock_irqsave(&ps->lock, flags);
667 while (!list_empty(list)) {
668 as = list_last_entry(list, struct async, asynclist);
669 list_del_init(&as->asynclist);
670 urb = as->urb;
671 usb_get_urb(urb);
672
673 /* drop the spinlock so the completion handler can run */
674 spin_unlock_irqrestore(&ps->lock, flags);
675 usb_kill_urb(urb);
676 usb_put_urb(urb);
677 spin_lock_irqsave(&ps->lock, flags);
678 }
679 spin_unlock_irqrestore(&ps->lock, flags);
680}
681
682static void destroy_async_on_interface(struct usb_dev_state *ps,
683 unsigned int ifnum)
684{
685 struct list_head *p, *q, hitlist;
686 unsigned long flags;
687
688 INIT_LIST_HEAD(&hitlist);
689 spin_lock_irqsave(&ps->lock, flags);
690 list_for_each_safe(p, q, &ps->async_pending)
691 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
692 list_move_tail(p, &hitlist);
693 spin_unlock_irqrestore(&ps->lock, flags);
694 destroy_async(ps, &hitlist);
695}
696
697static void destroy_all_async(struct usb_dev_state *ps)
698{
699 destroy_async(ps, &ps->async_pending);
700}
701
702/*
703 * interface claims are made only at the request of user level code,
704 * which can also release them (explicitly or by closing files).
705 * they're also undone when devices disconnect.
706 */
707
708static int driver_probe(struct usb_interface *intf,
709 const struct usb_device_id *id)
710{
711 return -ENODEV;
712}
713
714static void driver_disconnect(struct usb_interface *intf)
715{
716 struct usb_dev_state *ps = usb_get_intfdata(intf);
717 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
718
719 if (!ps)
720 return;
721
722 /* NOTE: this relies on usbcore having canceled and completed
723 * all pending I/O requests; 2.6 does that.
724 */
725
726 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
727 clear_bit(ifnum, &ps->ifclaimed);
728 else
729 dev_warn(&intf->dev, "interface number %u out of range\n",
730 ifnum);
731
732 usb_set_intfdata(intf, NULL);
733
734 /* force async requests to complete */
735 destroy_async_on_interface(ps, ifnum);
736}
737
738/* We don't care about suspend/resume of claimed interfaces */
739static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
740{
741 return 0;
742}
743
744static int driver_resume(struct usb_interface *intf)
745{
746 return 0;
747}
748
749#ifdef CONFIG_PM
750/* The following routines apply to the entire device, not interfaces */
751void usbfs_notify_suspend(struct usb_device *udev)
752{
753 /* We don't need to handle this */
754}
755
756void usbfs_notify_resume(struct usb_device *udev)
757{
758 struct usb_dev_state *ps;
759
760 /* Protect against simultaneous remove or release */
761 mutex_lock(&usbfs_mutex);
762 list_for_each_entry(ps, &udev->filelist, list) {
763 WRITE_ONCE(ps->not_yet_resumed, 0);
764 wake_up_all(&ps->wait_for_resume);
765 }
766 mutex_unlock(&usbfs_mutex);
767}
768#endif
769
770struct usb_driver usbfs_driver = {
771 .name = "usbfs",
772 .probe = driver_probe,
773 .disconnect = driver_disconnect,
774 .suspend = driver_suspend,
775 .resume = driver_resume,
776 .supports_autosuspend = 1,
777};
778
779static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
780{
781 struct usb_device *dev = ps->dev;
782 struct usb_interface *intf;
783 int err;
784
785 if (ifnum >= 8*sizeof(ps->ifclaimed))
786 return -EINVAL;
787 /* already claimed */
788 if (test_bit(ifnum, &ps->ifclaimed))
789 return 0;
790
791 if (ps->privileges_dropped &&
792 !test_bit(ifnum, &ps->interface_allowed_mask))
793 return -EACCES;
794
795 intf = usb_ifnum_to_if(dev, ifnum);
796 if (!intf)
797 err = -ENOENT;
798 else {
799 unsigned int old_suppress;
800
801 /* suppress uevents while claiming interface */
802 old_suppress = dev_get_uevent_suppress(&intf->dev);
803 dev_set_uevent_suppress(&intf->dev, 1);
804 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
805 dev_set_uevent_suppress(&intf->dev, old_suppress);
806 }
807 if (err == 0)
808 set_bit(ifnum, &ps->ifclaimed);
809 return err;
810}
811
812static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
813{
814 struct usb_device *dev;
815 struct usb_interface *intf;
816 int err;
817
818 err = -EINVAL;
819 if (ifnum >= 8*sizeof(ps->ifclaimed))
820 return err;
821 dev = ps->dev;
822 intf = usb_ifnum_to_if(dev, ifnum);
823 if (!intf)
824 err = -ENOENT;
825 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
826 unsigned int old_suppress;
827
828 /* suppress uevents while releasing interface */
829 old_suppress = dev_get_uevent_suppress(&intf->dev);
830 dev_set_uevent_suppress(&intf->dev, 1);
831 usb_driver_release_interface(&usbfs_driver, intf);
832 dev_set_uevent_suppress(&intf->dev, old_suppress);
833 err = 0;
834 }
835 return err;
836}
837
838static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
839{
840 if (ps->dev->state != USB_STATE_CONFIGURED)
841 return -EHOSTUNREACH;
842 if (ifnum >= 8*sizeof(ps->ifclaimed))
843 return -EINVAL;
844 if (test_bit(ifnum, &ps->ifclaimed))
845 return 0;
846 /* if not yet claimed, claim it for the driver */
847 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
848 "interface %u before use\n", task_pid_nr(current),
849 current->comm, ifnum);
850 return claimintf(ps, ifnum);
851}
852
853static int findintfep(struct usb_device *dev, unsigned int ep)
854{
855 unsigned int i, j, e;
856 struct usb_interface *intf;
857 struct usb_host_interface *alts;
858 struct usb_endpoint_descriptor *endpt;
859
860 if (ep & ~(USB_DIR_IN|0xf))
861 return -EINVAL;
862 if (!dev->actconfig)
863 return -ESRCH;
864 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
865 intf = dev->actconfig->interface[i];
866 for (j = 0; j < intf->num_altsetting; j++) {
867 alts = &intf->altsetting[j];
868 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
869 endpt = &alts->endpoint[e].desc;
870 if (endpt->bEndpointAddress == ep)
871 return alts->desc.bInterfaceNumber;
872 }
873 }
874 }
875 return -ENOENT;
876}
877
878static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
879 unsigned int request, unsigned int index)
880{
881 int ret = 0;
882 struct usb_host_interface *alt_setting;
883
884 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
885 && ps->dev->state != USB_STATE_ADDRESS
886 && ps->dev->state != USB_STATE_CONFIGURED)
887 return -EHOSTUNREACH;
888 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
889 return 0;
890
891 /*
892 * check for the special corner case 'get_device_id' in the printer
893 * class specification, which we always want to allow as it is used
894 * to query things like ink level, etc.
895 */
896 if (requesttype == 0xa1 && request == 0) {
897 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
898 index >> 8, index & 0xff);
899 if (alt_setting
900 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
901 return 0;
902 }
903
904 index &= 0xff;
905 switch (requesttype & USB_RECIP_MASK) {
906 case USB_RECIP_ENDPOINT:
907 if ((index & ~USB_DIR_IN) == 0)
908 return 0;
909 ret = findintfep(ps->dev, index);
910 if (ret < 0) {
911 /*
912 * Some not fully compliant Win apps seem to get
913 * index wrong and have the endpoint number here
914 * rather than the endpoint address (with the
915 * correct direction). Win does let this through,
916 * so we'll not reject it here but leave it to
917 * the device to not break KVM. But we warn.
918 */
919 ret = findintfep(ps->dev, index ^ 0x80);
920 if (ret >= 0)
921 dev_info(&ps->dev->dev,
922 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
923 __func__, task_pid_nr(current),
924 current->comm, index, index ^ 0x80);
925 }
926 if (ret >= 0)
927 ret = checkintf(ps, ret);
928 break;
929
930 case USB_RECIP_INTERFACE:
931 ret = checkintf(ps, index);
932 break;
933 }
934 return ret;
935}
936
937static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
938 unsigned char ep)
939{
940 if (ep & USB_ENDPOINT_DIR_MASK)
941 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
942 else
943 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
944}
945
946static int parse_usbdevfs_streams(struct usb_dev_state *ps,
947 struct usbdevfs_streams __user *streams,
948 unsigned int *num_streams_ret,
949 unsigned int *num_eps_ret,
950 struct usb_host_endpoint ***eps_ret,
951 struct usb_interface **intf_ret)
952{
953 unsigned int i, num_streams, num_eps;
954 struct usb_host_endpoint **eps;
955 struct usb_interface *intf = NULL;
956 unsigned char ep;
957 int ifnum, ret;
958
959 if (get_user(num_streams, &streams->num_streams) ||
960 get_user(num_eps, &streams->num_eps))
961 return -EFAULT;
962
963 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
964 return -EINVAL;
965
966 /* The XHCI controller allows max 2 ^ 16 streams */
967 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
968 return -EINVAL;
969
970 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
971 if (!eps)
972 return -ENOMEM;
973
974 for (i = 0; i < num_eps; i++) {
975 if (get_user(ep, &streams->eps[i])) {
976 ret = -EFAULT;
977 goto error;
978 }
979 eps[i] = ep_to_host_endpoint(ps->dev, ep);
980 if (!eps[i]) {
981 ret = -EINVAL;
982 goto error;
983 }
984
985 /* usb_alloc/free_streams operate on an usb_interface */
986 ifnum = findintfep(ps->dev, ep);
987 if (ifnum < 0) {
988 ret = ifnum;
989 goto error;
990 }
991
992 if (i == 0) {
993 ret = checkintf(ps, ifnum);
994 if (ret < 0)
995 goto error;
996 intf = usb_ifnum_to_if(ps->dev, ifnum);
997 } else {
998 /* Verify all eps belong to the same interface */
999 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1000 ret = -EINVAL;
1001 goto error;
1002 }
1003 }
1004 }
1005
1006 if (num_streams_ret)
1007 *num_streams_ret = num_streams;
1008 *num_eps_ret = num_eps;
1009 *eps_ret = eps;
1010 *intf_ret = intf;
1011
1012 return 0;
1013
1014error:
1015 kfree(eps);
1016 return ret;
1017}
1018
1019static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1020{
1021 struct device *dev;
1022
1023 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1024 if (!dev)
1025 return NULL;
1026 return to_usb_device(dev);
1027}
1028
1029/*
1030 * file operations
1031 */
1032static int usbdev_open(struct inode *inode, struct file *file)
1033{
1034 struct usb_device *dev = NULL;
1035 struct usb_dev_state *ps;
1036 int ret;
1037
1038 ret = -ENOMEM;
1039 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1040 if (!ps)
1041 goto out_free_ps;
1042
1043 ret = -ENODEV;
1044
1045 /* usbdev device-node */
1046 if (imajor(inode) == USB_DEVICE_MAJOR)
1047 dev = usbdev_lookup_by_devt(inode->i_rdev);
1048 if (!dev)
1049 goto out_free_ps;
1050
1051 usb_lock_device(dev);
1052 if (dev->state == USB_STATE_NOTATTACHED)
1053 goto out_unlock_device;
1054
1055 ret = usb_autoresume_device(dev);
1056 if (ret)
1057 goto out_unlock_device;
1058
1059 ps->dev = dev;
1060 ps->file = file;
1061 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1062 spin_lock_init(&ps->lock);
1063 INIT_LIST_HEAD(&ps->list);
1064 INIT_LIST_HEAD(&ps->async_pending);
1065 INIT_LIST_HEAD(&ps->async_completed);
1066 INIT_LIST_HEAD(&ps->memory_list);
1067 init_waitqueue_head(&ps->wait);
1068 init_waitqueue_head(&ps->wait_for_resume);
1069 ps->disc_pid = get_pid(task_pid(current));
1070 ps->cred = get_current_cred();
1071 smp_wmb();
1072
1073 /* Can't race with resume; the device is already active */
1074 list_add_tail(&ps->list, &dev->filelist);
1075 file->private_data = ps;
1076 usb_unlock_device(dev);
1077 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1078 current->comm);
1079 return ret;
1080
1081 out_unlock_device:
1082 usb_unlock_device(dev);
1083 usb_put_dev(dev);
1084 out_free_ps:
1085 kfree(ps);
1086 return ret;
1087}
1088
1089static int usbdev_release(struct inode *inode, struct file *file)
1090{
1091 struct usb_dev_state *ps = file->private_data;
1092 struct usb_device *dev = ps->dev;
1093 unsigned int ifnum;
1094 struct async *as;
1095
1096 usb_lock_device(dev);
1097 usb_hub_release_all_ports(dev, ps);
1098
1099 /* Protect against simultaneous resume */
1100 mutex_lock(&usbfs_mutex);
1101 list_del_init(&ps->list);
1102 mutex_unlock(&usbfs_mutex);
1103
1104 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1105 ifnum++) {
1106 if (test_bit(ifnum, &ps->ifclaimed))
1107 releaseintf(ps, ifnum);
1108 }
1109 destroy_all_async(ps);
1110 if (!ps->suspend_allowed)
1111 usb_autosuspend_device(dev);
1112 usb_unlock_device(dev);
1113 usb_put_dev(dev);
1114 put_pid(ps->disc_pid);
1115 put_cred(ps->cred);
1116
1117 as = async_getcompleted(ps);
1118 while (as) {
1119 free_async(as);
1120 as = async_getcompleted(ps);
1121 }
1122
1123 kfree(ps);
1124 return 0;
1125}
1126
1127static void usbfs_blocking_completion(struct urb *urb)
1128{
1129 complete((struct completion *) urb->context);
1130}
1131
1132/*
1133 * Much like usb_start_wait_urb, but returns status separately from
1134 * actual_length and uses a killable wait.
1135 */
1136static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1137 unsigned int *actlen)
1138{
1139 DECLARE_COMPLETION_ONSTACK(ctx);
1140 unsigned long expire;
1141 int rc;
1142
1143 urb->context = &ctx;
1144 urb->complete = usbfs_blocking_completion;
1145 *actlen = 0;
1146 rc = usb_submit_urb(urb, GFP_KERNEL);
1147 if (unlikely(rc))
1148 return rc;
1149
1150 expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1151 rc = wait_for_completion_killable_timeout(&ctx, expire);
1152 if (rc <= 0) {
1153 usb_kill_urb(urb);
1154 *actlen = urb->actual_length;
1155 if (urb->status != -ENOENT)
1156 ; /* Completed before it was killed */
1157 else if (rc < 0)
1158 return -EINTR;
1159 else
1160 return -ETIMEDOUT;
1161 }
1162 *actlen = urb->actual_length;
1163 return urb->status;
1164}
1165
1166static int do_proc_control(struct usb_dev_state *ps,
1167 struct usbdevfs_ctrltransfer *ctrl)
1168{
1169 struct usb_device *dev = ps->dev;
1170 unsigned int tmo;
1171 unsigned char *tbuf;
1172 unsigned int wLength, actlen;
1173 int i, pipe, ret;
1174 struct urb *urb = NULL;
1175 struct usb_ctrlrequest *dr = NULL;
1176
1177 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1178 ctrl->wIndex);
1179 if (ret)
1180 return ret;
1181 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1182 if (wLength > PAGE_SIZE)
1183 return -EINVAL;
1184 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1185 sizeof(struct usb_ctrlrequest));
1186 if (ret)
1187 return ret;
1188
1189 ret = -ENOMEM;
1190 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1191 if (!tbuf)
1192 goto done;
1193 urb = usb_alloc_urb(0, GFP_NOIO);
1194 if (!urb)
1195 goto done;
1196 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1197 if (!dr)
1198 goto done;
1199
1200 dr->bRequestType = ctrl->bRequestType;
1201 dr->bRequest = ctrl->bRequest;
1202 dr->wValue = cpu_to_le16(ctrl->wValue);
1203 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1204 dr->wLength = cpu_to_le16(ctrl->wLength);
1205
1206 tmo = ctrl->timeout;
1207 snoop(&dev->dev, "control urb: bRequestType=%02x "
1208 "bRequest=%02x wValue=%04x "
1209 "wIndex=%04x wLength=%04x\n",
1210 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1211 ctrl->wIndex, ctrl->wLength);
1212
1213 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1214 pipe = usb_rcvctrlpipe(dev, 0);
1215 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1216 wLength, NULL, NULL);
1217 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1218
1219 usb_unlock_device(dev);
1220 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1221
1222 /* Linger a bit, prior to the next control message. */
1223 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1224 msleep(200);
1225 usb_lock_device(dev);
1226 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1227 if (!i && actlen) {
1228 if (copy_to_user(ctrl->data, tbuf, actlen)) {
1229 ret = -EFAULT;
1230 goto done;
1231 }
1232 }
1233 } else {
1234 if (wLength) {
1235 if (copy_from_user(tbuf, ctrl->data, wLength)) {
1236 ret = -EFAULT;
1237 goto done;
1238 }
1239 }
1240 pipe = usb_sndctrlpipe(dev, 0);
1241 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1242 wLength, NULL, NULL);
1243 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1244
1245 usb_unlock_device(dev);
1246 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1247
1248 /* Linger a bit, prior to the next control message. */
1249 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1250 msleep(200);
1251 usb_lock_device(dev);
1252 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1253 }
1254 if (i < 0 && i != -EPIPE) {
1255 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1256 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1257 current->comm, ctrl->bRequestType, ctrl->bRequest,
1258 ctrl->wLength, i);
1259 }
1260 ret = (i < 0 ? i : actlen);
1261
1262 done:
1263 kfree(dr);
1264 usb_free_urb(urb);
1265 free_page((unsigned long) tbuf);
1266 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1267 sizeof(struct usb_ctrlrequest));
1268 return ret;
1269}
1270
1271static int proc_control(struct usb_dev_state *ps, void __user *arg)
1272{
1273 struct usbdevfs_ctrltransfer ctrl;
1274
1275 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1276 return -EFAULT;
1277 return do_proc_control(ps, &ctrl);
1278}
1279
1280static int do_proc_bulk(struct usb_dev_state *ps,
1281 struct usbdevfs_bulktransfer *bulk)
1282{
1283 struct usb_device *dev = ps->dev;
1284 unsigned int tmo, len1, len2, pipe;
1285 unsigned char *tbuf;
1286 int i, ret;
1287 struct urb *urb = NULL;
1288 struct usb_host_endpoint *ep;
1289
1290 ret = findintfep(ps->dev, bulk->ep);
1291 if (ret < 0)
1292 return ret;
1293 ret = checkintf(ps, ret);
1294 if (ret)
1295 return ret;
1296
1297 len1 = bulk->len;
1298 if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1299 return -EINVAL;
1300
1301 if (bulk->ep & USB_DIR_IN)
1302 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1303 else
1304 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1305 ep = usb_pipe_endpoint(dev, pipe);
1306 if (!ep || !usb_endpoint_maxp(&ep->desc))
1307 return -EINVAL;
1308 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1309 if (ret)
1310 return ret;
1311
1312 /*
1313 * len1 can be almost arbitrarily large. Don't WARN if it's
1314 * too big, just fail the request.
1315 */
1316 ret = -ENOMEM;
1317 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1318 if (!tbuf)
1319 goto done;
1320 urb = usb_alloc_urb(0, GFP_KERNEL);
1321 if (!urb)
1322 goto done;
1323
1324 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1325 USB_ENDPOINT_XFER_INT) {
1326 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1327 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1328 NULL, NULL, ep->desc.bInterval);
1329 } else {
1330 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1331 }
1332
1333 tmo = bulk->timeout;
1334 if (bulk->ep & 0x80) {
1335 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1336
1337 usb_unlock_device(dev);
1338 i = usbfs_start_wait_urb(urb, tmo, &len2);
1339 usb_lock_device(dev);
1340 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1341
1342 if (!i && len2) {
1343 if (copy_to_user(bulk->data, tbuf, len2)) {
1344 ret = -EFAULT;
1345 goto done;
1346 }
1347 }
1348 } else {
1349 if (len1) {
1350 if (copy_from_user(tbuf, bulk->data, len1)) {
1351 ret = -EFAULT;
1352 goto done;
1353 }
1354 }
1355 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1356
1357 usb_unlock_device(dev);
1358 i = usbfs_start_wait_urb(urb, tmo, &len2);
1359 usb_lock_device(dev);
1360 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1361 }
1362 ret = (i < 0 ? i : len2);
1363 done:
1364 usb_free_urb(urb);
1365 kfree(tbuf);
1366 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1367 return ret;
1368}
1369
1370static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1371{
1372 struct usbdevfs_bulktransfer bulk;
1373
1374 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1375 return -EFAULT;
1376 return do_proc_bulk(ps, &bulk);
1377}
1378
1379static void check_reset_of_active_ep(struct usb_device *udev,
1380 unsigned int epnum, char *ioctl_name)
1381{
1382 struct usb_host_endpoint **eps;
1383 struct usb_host_endpoint *ep;
1384
1385 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1386 ep = eps[epnum & 0x0f];
1387 if (ep && !list_empty(&ep->urb_list))
1388 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1389 task_pid_nr(current), current->comm,
1390 ioctl_name, epnum);
1391}
1392
1393static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1394{
1395 unsigned int ep;
1396 int ret;
1397
1398 if (get_user(ep, (unsigned int __user *)arg))
1399 return -EFAULT;
1400 ret = findintfep(ps->dev, ep);
1401 if (ret < 0)
1402 return ret;
1403 ret = checkintf(ps, ret);
1404 if (ret)
1405 return ret;
1406 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1407 usb_reset_endpoint(ps->dev, ep);
1408 return 0;
1409}
1410
1411static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1412{
1413 unsigned int ep;
1414 int pipe;
1415 int ret;
1416
1417 if (get_user(ep, (unsigned int __user *)arg))
1418 return -EFAULT;
1419 ret = findintfep(ps->dev, ep);
1420 if (ret < 0)
1421 return ret;
1422 ret = checkintf(ps, ret);
1423 if (ret)
1424 return ret;
1425 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1426 if (ep & USB_DIR_IN)
1427 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1428 else
1429 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1430
1431 return usb_clear_halt(ps->dev, pipe);
1432}
1433
1434static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1435{
1436 struct usbdevfs_getdriver gd;
1437 struct usb_interface *intf;
1438 int ret;
1439
1440 if (copy_from_user(&gd, arg, sizeof(gd)))
1441 return -EFAULT;
1442 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1443 if (!intf || !intf->dev.driver)
1444 ret = -ENODATA;
1445 else {
1446 strscpy(gd.driver, intf->dev.driver->name,
1447 sizeof(gd.driver));
1448 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1449 }
1450 return ret;
1451}
1452
1453static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1454{
1455 struct usbdevfs_connectinfo ci;
1456
1457 memset(&ci, 0, sizeof(ci));
1458 ci.devnum = ps->dev->devnum;
1459 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1460
1461 if (copy_to_user(arg, &ci, sizeof(ci)))
1462 return -EFAULT;
1463 return 0;
1464}
1465
1466static int proc_conninfo_ex(struct usb_dev_state *ps,
1467 void __user *arg, size_t size)
1468{
1469 struct usbdevfs_conninfo_ex ci;
1470 struct usb_device *udev = ps->dev;
1471
1472 if (size < sizeof(ci.size))
1473 return -EINVAL;
1474
1475 memset(&ci, 0, sizeof(ci));
1476 ci.size = sizeof(ci);
1477 ci.busnum = udev->bus->busnum;
1478 ci.devnum = udev->devnum;
1479 ci.speed = udev->speed;
1480
1481 while (udev && udev->portnum != 0) {
1482 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1483 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1484 udev->portnum;
1485 udev = udev->parent;
1486 }
1487
1488 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1489 memmove(&ci.ports[0],
1490 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1491 ci.num_ports);
1492
1493 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1494 return -EFAULT;
1495
1496 return 0;
1497}
1498
1499static int proc_resetdevice(struct usb_dev_state *ps)
1500{
1501 struct usb_host_config *actconfig = ps->dev->actconfig;
1502 struct usb_interface *interface;
1503 int i, number;
1504
1505 /* Don't allow a device reset if the process has dropped the
1506 * privilege to do such things and any of the interfaces are
1507 * currently claimed.
1508 */
1509 if (ps->privileges_dropped && actconfig) {
1510 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1511 interface = actconfig->interface[i];
1512 number = interface->cur_altsetting->desc.bInterfaceNumber;
1513 if (usb_interface_claimed(interface) &&
1514 !test_bit(number, &ps->ifclaimed)) {
1515 dev_warn(&ps->dev->dev,
1516 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1517 number, interface->dev.driver->name, current->comm);
1518 return -EACCES;
1519 }
1520 }
1521 }
1522
1523 return usb_reset_device(ps->dev);
1524}
1525
1526static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1527{
1528 struct usbdevfs_setinterface setintf;
1529 int ret;
1530
1531 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1532 return -EFAULT;
1533 ret = checkintf(ps, setintf.interface);
1534 if (ret)
1535 return ret;
1536
1537 destroy_async_on_interface(ps, setintf.interface);
1538
1539 return usb_set_interface(ps->dev, setintf.interface,
1540 setintf.altsetting);
1541}
1542
1543static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1544{
1545 int u;
1546 int status = 0;
1547 struct usb_host_config *actconfig;
1548
1549 if (get_user(u, (int __user *)arg))
1550 return -EFAULT;
1551
1552 actconfig = ps->dev->actconfig;
1553
1554 /* Don't touch the device if any interfaces are claimed.
1555 * It could interfere with other drivers' operations, and if
1556 * an interface is claimed by usbfs it could easily deadlock.
1557 */
1558 if (actconfig) {
1559 int i;
1560
1561 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1562 if (usb_interface_claimed(actconfig->interface[i])) {
1563 dev_warn(&ps->dev->dev,
1564 "usbfs: interface %d claimed by %s "
1565 "while '%s' sets config #%d\n",
1566 actconfig->interface[i]
1567 ->cur_altsetting
1568 ->desc.bInterfaceNumber,
1569 actconfig->interface[i]
1570 ->dev.driver->name,
1571 current->comm, u);
1572 status = -EBUSY;
1573 break;
1574 }
1575 }
1576 }
1577
1578 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1579 * so avoid usb_set_configuration()'s kick to sysfs
1580 */
1581 if (status == 0) {
1582 if (actconfig && actconfig->desc.bConfigurationValue == u)
1583 status = usb_reset_configuration(ps->dev);
1584 else
1585 status = usb_set_configuration(ps->dev, u);
1586 }
1587
1588 return status;
1589}
1590
1591static struct usb_memory *
1592find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1593{
1594 struct usb_memory *usbm = NULL, *iter;
1595 unsigned long flags;
1596 unsigned long uurb_start = (unsigned long)uurb->buffer;
1597
1598 spin_lock_irqsave(&ps->lock, flags);
1599 list_for_each_entry(iter, &ps->memory_list, memlist) {
1600 if (uurb_start >= iter->vm_start &&
1601 uurb_start < iter->vm_start + iter->size) {
1602 if (uurb->buffer_length > iter->vm_start + iter->size -
1603 uurb_start) {
1604 usbm = ERR_PTR(-EINVAL);
1605 } else {
1606 usbm = iter;
1607 usbm->urb_use_count++;
1608 }
1609 break;
1610 }
1611 }
1612 spin_unlock_irqrestore(&ps->lock, flags);
1613 return usbm;
1614}
1615
1616static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1617 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1618 void __user *arg, sigval_t userurb_sigval)
1619{
1620 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1621 struct usb_host_endpoint *ep;
1622 struct async *as = NULL;
1623 struct usb_ctrlrequest *dr = NULL;
1624 unsigned int u, totlen, isofrmlen;
1625 int i, ret, num_sgs = 0, ifnum = -1;
1626 int number_of_packets = 0;
1627 unsigned int stream_id = 0;
1628 void *buf;
1629 bool is_in;
1630 bool allow_short = false;
1631 bool allow_zero = false;
1632 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1633 USBDEVFS_URB_BULK_CONTINUATION |
1634 USBDEVFS_URB_NO_FSBR |
1635 USBDEVFS_URB_ZERO_PACKET |
1636 USBDEVFS_URB_NO_INTERRUPT;
1637 /* USBDEVFS_URB_ISO_ASAP is a special case */
1638 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1639 mask |= USBDEVFS_URB_ISO_ASAP;
1640
1641 if (uurb->flags & ~mask)
1642 return -EINVAL;
1643
1644 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1645 return -EINVAL;
1646 if (uurb->buffer_length > 0 && !uurb->buffer)
1647 return -EINVAL;
1648 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1649 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1650 ifnum = findintfep(ps->dev, uurb->endpoint);
1651 if (ifnum < 0)
1652 return ifnum;
1653 ret = checkintf(ps, ifnum);
1654 if (ret)
1655 return ret;
1656 }
1657 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1658 if (!ep)
1659 return -ENOENT;
1660 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1661
1662 u = 0;
1663 switch (uurb->type) {
1664 case USBDEVFS_URB_TYPE_CONTROL:
1665 if (!usb_endpoint_xfer_control(&ep->desc))
1666 return -EINVAL;
1667 /* min 8 byte setup packet */
1668 if (uurb->buffer_length < 8)
1669 return -EINVAL;
1670 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1671 if (!dr)
1672 return -ENOMEM;
1673 if (copy_from_user(dr, uurb->buffer, 8)) {
1674 ret = -EFAULT;
1675 goto error;
1676 }
1677 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1678 ret = -EINVAL;
1679 goto error;
1680 }
1681 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1682 le16_to_cpu(dr->wIndex));
1683 if (ret)
1684 goto error;
1685 uurb->buffer_length = le16_to_cpu(dr->wLength);
1686 uurb->buffer += 8;
1687 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1688 is_in = true;
1689 uurb->endpoint |= USB_DIR_IN;
1690 } else {
1691 is_in = false;
1692 uurb->endpoint &= ~USB_DIR_IN;
1693 }
1694 if (is_in)
1695 allow_short = true;
1696 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1697 "bRequest=%02x wValue=%04x "
1698 "wIndex=%04x wLength=%04x\n",
1699 dr->bRequestType, dr->bRequest,
1700 __le16_to_cpu(dr->wValue),
1701 __le16_to_cpu(dr->wIndex),
1702 __le16_to_cpu(dr->wLength));
1703 u = sizeof(struct usb_ctrlrequest);
1704 break;
1705
1706 case USBDEVFS_URB_TYPE_BULK:
1707 if (!is_in)
1708 allow_zero = true;
1709 else
1710 allow_short = true;
1711 switch (usb_endpoint_type(&ep->desc)) {
1712 case USB_ENDPOINT_XFER_CONTROL:
1713 case USB_ENDPOINT_XFER_ISOC:
1714 return -EINVAL;
1715 case USB_ENDPOINT_XFER_INT:
1716 /* allow single-shot interrupt transfers */
1717 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1718 goto interrupt_urb;
1719 }
1720 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1721 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1722 num_sgs = 0;
1723 if (ep->streams)
1724 stream_id = uurb->stream_id;
1725 break;
1726
1727 case USBDEVFS_URB_TYPE_INTERRUPT:
1728 if (!usb_endpoint_xfer_int(&ep->desc))
1729 return -EINVAL;
1730 interrupt_urb:
1731 if (!is_in)
1732 allow_zero = true;
1733 else
1734 allow_short = true;
1735 break;
1736
1737 case USBDEVFS_URB_TYPE_ISO:
1738 /* arbitrary limit */
1739 if (uurb->number_of_packets < 1 ||
1740 uurb->number_of_packets > 128)
1741 return -EINVAL;
1742 if (!usb_endpoint_xfer_isoc(&ep->desc))
1743 return -EINVAL;
1744 number_of_packets = uurb->number_of_packets;
1745 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1746 number_of_packets;
1747 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1748 if (IS_ERR(isopkt)) {
1749 ret = PTR_ERR(isopkt);
1750 isopkt = NULL;
1751 goto error;
1752 }
1753 for (totlen = u = 0; u < number_of_packets; u++) {
1754 /*
1755 * arbitrary limit need for USB 3.1 Gen2
1756 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1757 */
1758 if (isopkt[u].length > 98304) {
1759 ret = -EINVAL;
1760 goto error;
1761 }
1762 totlen += isopkt[u].length;
1763 }
1764 u *= sizeof(struct usb_iso_packet_descriptor);
1765 uurb->buffer_length = totlen;
1766 break;
1767
1768 default:
1769 return -EINVAL;
1770 }
1771
1772 if (uurb->buffer_length > 0 &&
1773 !access_ok(uurb->buffer, uurb->buffer_length)) {
1774 ret = -EFAULT;
1775 goto error;
1776 }
1777 as = alloc_async(number_of_packets);
1778 if (!as) {
1779 ret = -ENOMEM;
1780 goto error;
1781 }
1782
1783 as->usbm = find_memory_area(ps, uurb);
1784 if (IS_ERR(as->usbm)) {
1785 ret = PTR_ERR(as->usbm);
1786 as->usbm = NULL;
1787 goto error;
1788 }
1789
1790 /* do not use SG buffers when memory mapped segments
1791 * are in use
1792 */
1793 if (as->usbm)
1794 num_sgs = 0;
1795
1796 u += sizeof(struct async) + sizeof(struct urb) +
1797 (as->usbm ? 0 : uurb->buffer_length) +
1798 num_sgs * sizeof(struct scatterlist);
1799 ret = usbfs_increase_memory_usage(u);
1800 if (ret)
1801 goto error;
1802 as->mem_usage = u;
1803
1804 if (num_sgs) {
1805 as->urb->sg = kmalloc_array(num_sgs,
1806 sizeof(struct scatterlist),
1807 GFP_KERNEL | __GFP_NOWARN);
1808 if (!as->urb->sg) {
1809 ret = -ENOMEM;
1810 goto error;
1811 }
1812 as->urb->num_sgs = num_sgs;
1813 sg_init_table(as->urb->sg, as->urb->num_sgs);
1814
1815 totlen = uurb->buffer_length;
1816 for (i = 0; i < as->urb->num_sgs; i++) {
1817 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1818 buf = kmalloc(u, GFP_KERNEL);
1819 if (!buf) {
1820 ret = -ENOMEM;
1821 goto error;
1822 }
1823 sg_set_buf(&as->urb->sg[i], buf, u);
1824
1825 if (!is_in) {
1826 if (copy_from_user(buf, uurb->buffer, u)) {
1827 ret = -EFAULT;
1828 goto error;
1829 }
1830 uurb->buffer += u;
1831 }
1832 totlen -= u;
1833 }
1834 } else if (uurb->buffer_length > 0) {
1835 if (as->usbm) {
1836 unsigned long uurb_start = (unsigned long)uurb->buffer;
1837
1838 as->urb->transfer_buffer = as->usbm->mem +
1839 (uurb_start - as->usbm->vm_start);
1840 } else {
1841 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1842 GFP_KERNEL | __GFP_NOWARN);
1843 if (!as->urb->transfer_buffer) {
1844 ret = -ENOMEM;
1845 goto error;
1846 }
1847 if (!is_in) {
1848 if (copy_from_user(as->urb->transfer_buffer,
1849 uurb->buffer,
1850 uurb->buffer_length)) {
1851 ret = -EFAULT;
1852 goto error;
1853 }
1854 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1855 /*
1856 * Isochronous input data may end up being
1857 * discontiguous if some of the packets are
1858 * short. Clear the buffer so that the gaps
1859 * don't leak kernel data to userspace.
1860 */
1861 memset(as->urb->transfer_buffer, 0,
1862 uurb->buffer_length);
1863 }
1864 }
1865 }
1866 as->urb->dev = ps->dev;
1867 as->urb->pipe = (uurb->type << 30) |
1868 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1869 (uurb->endpoint & USB_DIR_IN);
1870
1871 /* This tedious sequence is necessary because the URB_* flags
1872 * are internal to the kernel and subject to change, whereas
1873 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1874 */
1875 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1876 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1877 u |= URB_ISO_ASAP;
1878 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1879 u |= URB_SHORT_NOT_OK;
1880 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1881 u |= URB_ZERO_PACKET;
1882 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1883 u |= URB_NO_INTERRUPT;
1884 as->urb->transfer_flags = u;
1885
1886 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1887 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1888 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1889 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1890
1891 as->urb->transfer_buffer_length = uurb->buffer_length;
1892 as->urb->setup_packet = (unsigned char *)dr;
1893 dr = NULL;
1894 as->urb->start_frame = uurb->start_frame;
1895 as->urb->number_of_packets = number_of_packets;
1896 as->urb->stream_id = stream_id;
1897
1898 if (ep->desc.bInterval) {
1899 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1900 ps->dev->speed == USB_SPEED_HIGH ||
1901 ps->dev->speed >= USB_SPEED_SUPER)
1902 as->urb->interval = 1 <<
1903 min(15, ep->desc.bInterval - 1);
1904 else
1905 as->urb->interval = ep->desc.bInterval;
1906 }
1907
1908 as->urb->context = as;
1909 as->urb->complete = async_completed;
1910 for (totlen = u = 0; u < number_of_packets; u++) {
1911 as->urb->iso_frame_desc[u].offset = totlen;
1912 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1913 totlen += isopkt[u].length;
1914 }
1915 kfree(isopkt);
1916 isopkt = NULL;
1917 as->ps = ps;
1918 as->userurb = arg;
1919 as->userurb_sigval = userurb_sigval;
1920 if (as->usbm) {
1921 unsigned long uurb_start = (unsigned long)uurb->buffer;
1922
1923 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1924 as->urb->transfer_dma = as->usbm->dma_handle +
1925 (uurb_start - as->usbm->vm_start);
1926 } else if (is_in && uurb->buffer_length > 0)
1927 as->userbuffer = uurb->buffer;
1928 as->signr = uurb->signr;
1929 as->ifnum = ifnum;
1930 as->pid = get_pid(task_pid(current));
1931 as->cred = get_current_cred();
1932 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1933 as->urb->transfer_buffer_length, 0, SUBMIT,
1934 NULL, 0);
1935 if (!is_in)
1936 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1937
1938 async_newpending(as);
1939
1940 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1941 spin_lock_irq(&ps->lock);
1942
1943 /* Not exactly the endpoint address; the direction bit is
1944 * shifted to the 0x10 position so that the value will be
1945 * between 0 and 31.
1946 */
1947 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1948 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1949 >> 3);
1950
1951 /* If this bulk URB is the start of a new transfer, re-enable
1952 * the endpoint. Otherwise mark it as a continuation URB.
1953 */
1954 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1955 as->bulk_status = AS_CONTINUATION;
1956 else
1957 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1958
1959 /* Don't accept continuation URBs if the endpoint is
1960 * disabled because of an earlier error.
1961 */
1962 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1963 ret = -EREMOTEIO;
1964 else
1965 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1966 spin_unlock_irq(&ps->lock);
1967 } else {
1968 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1969 }
1970
1971 if (ret) {
1972 dev_printk(KERN_DEBUG, &ps->dev->dev,
1973 "usbfs: usb_submit_urb returned %d\n", ret);
1974 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1975 0, ret, COMPLETE, NULL, 0);
1976 async_removepending(as);
1977 goto error;
1978 }
1979 return 0;
1980
1981 error:
1982 kfree(isopkt);
1983 kfree(dr);
1984 if (as)
1985 free_async(as);
1986 return ret;
1987}
1988
1989static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1990{
1991 struct usbdevfs_urb uurb;
1992 sigval_t userurb_sigval;
1993
1994 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1995 return -EFAULT;
1996
1997 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1998 userurb_sigval.sival_ptr = arg;
1999
2000 return proc_do_submiturb(ps, &uurb,
2001 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2002 arg, userurb_sigval);
2003}
2004
2005static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2006{
2007 struct urb *urb;
2008 struct async *as;
2009 unsigned long flags;
2010
2011 spin_lock_irqsave(&ps->lock, flags);
2012 as = async_getpending(ps, arg);
2013 if (!as) {
2014 spin_unlock_irqrestore(&ps->lock, flags);
2015 return -EINVAL;
2016 }
2017
2018 urb = as->urb;
2019 usb_get_urb(urb);
2020 spin_unlock_irqrestore(&ps->lock, flags);
2021
2022 usb_kill_urb(urb);
2023 usb_put_urb(urb);
2024
2025 return 0;
2026}
2027
2028static void compute_isochronous_actual_length(struct urb *urb)
2029{
2030 unsigned int i;
2031
2032 if (urb->number_of_packets > 0) {
2033 urb->actual_length = 0;
2034 for (i = 0; i < urb->number_of_packets; i++)
2035 urb->actual_length +=
2036 urb->iso_frame_desc[i].actual_length;
2037 }
2038}
2039
2040static int processcompl(struct async *as, void __user * __user *arg)
2041{
2042 struct urb *urb = as->urb;
2043 struct usbdevfs_urb __user *userurb = as->userurb;
2044 void __user *addr = as->userurb;
2045 unsigned int i;
2046
2047 compute_isochronous_actual_length(urb);
2048 if (as->userbuffer && urb->actual_length) {
2049 if (copy_urb_data_to_user(as->userbuffer, urb))
2050 goto err_out;
2051 }
2052 if (put_user(as->status, &userurb->status))
2053 goto err_out;
2054 if (put_user(urb->actual_length, &userurb->actual_length))
2055 goto err_out;
2056 if (put_user(urb->error_count, &userurb->error_count))
2057 goto err_out;
2058
2059 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2060 for (i = 0; i < urb->number_of_packets; i++) {
2061 if (put_user(urb->iso_frame_desc[i].actual_length,
2062 &userurb->iso_frame_desc[i].actual_length))
2063 goto err_out;
2064 if (put_user(urb->iso_frame_desc[i].status,
2065 &userurb->iso_frame_desc[i].status))
2066 goto err_out;
2067 }
2068 }
2069
2070 if (put_user(addr, (void __user * __user *)arg))
2071 return -EFAULT;
2072 return 0;
2073
2074err_out:
2075 return -EFAULT;
2076}
2077
2078static struct async *reap_as(struct usb_dev_state *ps)
2079{
2080 DECLARE_WAITQUEUE(wait, current);
2081 struct async *as = NULL;
2082 struct usb_device *dev = ps->dev;
2083
2084 add_wait_queue(&ps->wait, &wait);
2085 for (;;) {
2086 __set_current_state(TASK_INTERRUPTIBLE);
2087 as = async_getcompleted(ps);
2088 if (as || !connected(ps))
2089 break;
2090 if (signal_pending(current))
2091 break;
2092 usb_unlock_device(dev);
2093 schedule();
2094 usb_lock_device(dev);
2095 }
2096 remove_wait_queue(&ps->wait, &wait);
2097 set_current_state(TASK_RUNNING);
2098 return as;
2099}
2100
2101static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2102{
2103 struct async *as = reap_as(ps);
2104
2105 if (as) {
2106 int retval;
2107
2108 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2109 retval = processcompl(as, (void __user * __user *)arg);
2110 free_async(as);
2111 return retval;
2112 }
2113 if (signal_pending(current))
2114 return -EINTR;
2115 return -ENODEV;
2116}
2117
2118static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2119{
2120 int retval;
2121 struct async *as;
2122
2123 as = async_getcompleted(ps);
2124 if (as) {
2125 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2126 retval = processcompl(as, (void __user * __user *)arg);
2127 free_async(as);
2128 } else {
2129 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2130 }
2131 return retval;
2132}
2133
2134#ifdef CONFIG_COMPAT
2135static int proc_control_compat(struct usb_dev_state *ps,
2136 struct usbdevfs_ctrltransfer32 __user *p32)
2137{
2138 struct usbdevfs_ctrltransfer ctrl;
2139 u32 udata;
2140
2141 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2142 get_user(udata, &p32->data))
2143 return -EFAULT;
2144 ctrl.data = compat_ptr(udata);
2145 return do_proc_control(ps, &ctrl);
2146}
2147
2148static int proc_bulk_compat(struct usb_dev_state *ps,
2149 struct usbdevfs_bulktransfer32 __user *p32)
2150{
2151 struct usbdevfs_bulktransfer bulk;
2152 compat_caddr_t addr;
2153
2154 if (get_user(bulk.ep, &p32->ep) ||
2155 get_user(bulk.len, &p32->len) ||
2156 get_user(bulk.timeout, &p32->timeout) ||
2157 get_user(addr, &p32->data))
2158 return -EFAULT;
2159 bulk.data = compat_ptr(addr);
2160 return do_proc_bulk(ps, &bulk);
2161}
2162
2163static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2164{
2165 struct usbdevfs_disconnectsignal32 ds;
2166
2167 if (copy_from_user(&ds, arg, sizeof(ds)))
2168 return -EFAULT;
2169 ps->discsignr = ds.signr;
2170 ps->disccontext.sival_int = ds.context;
2171 return 0;
2172}
2173
2174static int get_urb32(struct usbdevfs_urb *kurb,
2175 struct usbdevfs_urb32 __user *uurb)
2176{
2177 struct usbdevfs_urb32 urb32;
2178 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2179 return -EFAULT;
2180 kurb->type = urb32.type;
2181 kurb->endpoint = urb32.endpoint;
2182 kurb->status = urb32.status;
2183 kurb->flags = urb32.flags;
2184 kurb->buffer = compat_ptr(urb32.buffer);
2185 kurb->buffer_length = urb32.buffer_length;
2186 kurb->actual_length = urb32.actual_length;
2187 kurb->start_frame = urb32.start_frame;
2188 kurb->number_of_packets = urb32.number_of_packets;
2189 kurb->error_count = urb32.error_count;
2190 kurb->signr = urb32.signr;
2191 kurb->usercontext = compat_ptr(urb32.usercontext);
2192 return 0;
2193}
2194
2195static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2196{
2197 struct usbdevfs_urb uurb;
2198 sigval_t userurb_sigval;
2199
2200 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2201 return -EFAULT;
2202
2203 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2204 userurb_sigval.sival_int = ptr_to_compat(arg);
2205
2206 return proc_do_submiturb(ps, &uurb,
2207 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2208 arg, userurb_sigval);
2209}
2210
2211static int processcompl_compat(struct async *as, void __user * __user *arg)
2212{
2213 struct urb *urb = as->urb;
2214 struct usbdevfs_urb32 __user *userurb = as->userurb;
2215 void __user *addr = as->userurb;
2216 unsigned int i;
2217
2218 compute_isochronous_actual_length(urb);
2219 if (as->userbuffer && urb->actual_length) {
2220 if (copy_urb_data_to_user(as->userbuffer, urb))
2221 return -EFAULT;
2222 }
2223 if (put_user(as->status, &userurb->status))
2224 return -EFAULT;
2225 if (put_user(urb->actual_length, &userurb->actual_length))
2226 return -EFAULT;
2227 if (put_user(urb->error_count, &userurb->error_count))
2228 return -EFAULT;
2229
2230 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2231 for (i = 0; i < urb->number_of_packets; i++) {
2232 if (put_user(urb->iso_frame_desc[i].actual_length,
2233 &userurb->iso_frame_desc[i].actual_length))
2234 return -EFAULT;
2235 if (put_user(urb->iso_frame_desc[i].status,
2236 &userurb->iso_frame_desc[i].status))
2237 return -EFAULT;
2238 }
2239 }
2240
2241 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2242 return -EFAULT;
2243 return 0;
2244}
2245
2246static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2247{
2248 struct async *as = reap_as(ps);
2249
2250 if (as) {
2251 int retval;
2252
2253 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2254 retval = processcompl_compat(as, (void __user * __user *)arg);
2255 free_async(as);
2256 return retval;
2257 }
2258 if (signal_pending(current))
2259 return -EINTR;
2260 return -ENODEV;
2261}
2262
2263static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2264{
2265 int retval;
2266 struct async *as;
2267
2268 as = async_getcompleted(ps);
2269 if (as) {
2270 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2271 retval = processcompl_compat(as, (void __user * __user *)arg);
2272 free_async(as);
2273 } else {
2274 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2275 }
2276 return retval;
2277}
2278
2279
2280#endif
2281
2282static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2283{
2284 struct usbdevfs_disconnectsignal ds;
2285
2286 if (copy_from_user(&ds, arg, sizeof(ds)))
2287 return -EFAULT;
2288 ps->discsignr = ds.signr;
2289 ps->disccontext.sival_ptr = ds.context;
2290 return 0;
2291}
2292
2293static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2294{
2295 unsigned int ifnum;
2296
2297 if (get_user(ifnum, (unsigned int __user *)arg))
2298 return -EFAULT;
2299 return claimintf(ps, ifnum);
2300}
2301
2302static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2303{
2304 unsigned int ifnum;
2305 int ret;
2306
2307 if (get_user(ifnum, (unsigned int __user *)arg))
2308 return -EFAULT;
2309 ret = releaseintf(ps, ifnum);
2310 if (ret < 0)
2311 return ret;
2312 destroy_async_on_interface(ps, ifnum);
2313 return 0;
2314}
2315
2316static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2317{
2318 int size;
2319 void *buf = NULL;
2320 int retval = 0;
2321 struct usb_interface *intf = NULL;
2322 struct usb_driver *driver = NULL;
2323
2324 if (ps->privileges_dropped)
2325 return -EACCES;
2326
2327 if (!connected(ps))
2328 return -ENODEV;
2329
2330 /* alloc buffer */
2331 size = _IOC_SIZE(ctl->ioctl_code);
2332 if (size > 0) {
2333 buf = kmalloc(size, GFP_KERNEL);
2334 if (buf == NULL)
2335 return -ENOMEM;
2336 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2337 if (copy_from_user(buf, ctl->data, size)) {
2338 kfree(buf);
2339 return -EFAULT;
2340 }
2341 } else {
2342 memset(buf, 0, size);
2343 }
2344 }
2345
2346 if (ps->dev->state != USB_STATE_CONFIGURED)
2347 retval = -EHOSTUNREACH;
2348 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2349 retval = -EINVAL;
2350 else switch (ctl->ioctl_code) {
2351
2352 /* disconnect kernel driver from interface */
2353 case USBDEVFS_DISCONNECT:
2354 if (intf->dev.driver) {
2355 driver = to_usb_driver(intf->dev.driver);
2356 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2357 usb_driver_release_interface(driver, intf);
2358 } else
2359 retval = -ENODATA;
2360 break;
2361
2362 /* let kernel drivers try to (re)bind to the interface */
2363 case USBDEVFS_CONNECT:
2364 if (!intf->dev.driver)
2365 retval = device_attach(&intf->dev);
2366 else
2367 retval = -EBUSY;
2368 break;
2369
2370 /* talk directly to the interface's driver */
2371 default:
2372 if (intf->dev.driver)
2373 driver = to_usb_driver(intf->dev.driver);
2374 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2375 retval = -ENOTTY;
2376 } else {
2377 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2378 if (retval == -ENOIOCTLCMD)
2379 retval = -ENOTTY;
2380 }
2381 }
2382
2383 /* cleanup and return */
2384 if (retval >= 0
2385 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2386 && size > 0
2387 && copy_to_user(ctl->data, buf, size) != 0)
2388 retval = -EFAULT;
2389
2390 kfree(buf);
2391 return retval;
2392}
2393
2394static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2395{
2396 struct usbdevfs_ioctl ctrl;
2397
2398 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2399 return -EFAULT;
2400 return proc_ioctl(ps, &ctrl);
2401}
2402
2403#ifdef CONFIG_COMPAT
2404static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2405{
2406 struct usbdevfs_ioctl32 ioc32;
2407 struct usbdevfs_ioctl ctrl;
2408
2409 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2410 return -EFAULT;
2411 ctrl.ifno = ioc32.ifno;
2412 ctrl.ioctl_code = ioc32.ioctl_code;
2413 ctrl.data = compat_ptr(ioc32.data);
2414 return proc_ioctl(ps, &ctrl);
2415}
2416#endif
2417
2418static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2419{
2420 unsigned portnum;
2421 int rc;
2422
2423 if (get_user(portnum, (unsigned __user *) arg))
2424 return -EFAULT;
2425 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2426 if (rc == 0)
2427 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2428 portnum, task_pid_nr(current), current->comm);
2429 return rc;
2430}
2431
2432static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2433{
2434 unsigned portnum;
2435
2436 if (get_user(portnum, (unsigned __user *) arg))
2437 return -EFAULT;
2438 return usb_hub_release_port(ps->dev, portnum, ps);
2439}
2440
2441static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2442{
2443 __u32 caps;
2444
2445 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2446 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2447 USBDEVFS_CAP_DROP_PRIVILEGES |
2448 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2449 if (!ps->dev->bus->no_stop_on_short)
2450 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2451 if (ps->dev->bus->sg_tablesize)
2452 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2453
2454 if (put_user(caps, (__u32 __user *)arg))
2455 return -EFAULT;
2456
2457 return 0;
2458}
2459
2460static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2461{
2462 struct usbdevfs_disconnect_claim dc;
2463 struct usb_interface *intf;
2464
2465 if (copy_from_user(&dc, arg, sizeof(dc)))
2466 return -EFAULT;
2467
2468 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2469 if (!intf)
2470 return -EINVAL;
2471
2472 if (intf->dev.driver) {
2473 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2474
2475 if (ps->privileges_dropped)
2476 return -EACCES;
2477
2478 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2479 strncmp(dc.driver, intf->dev.driver->name,
2480 sizeof(dc.driver)) != 0)
2481 return -EBUSY;
2482
2483 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2484 strncmp(dc.driver, intf->dev.driver->name,
2485 sizeof(dc.driver)) == 0)
2486 return -EBUSY;
2487
2488 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2489 usb_driver_release_interface(driver, intf);
2490 }
2491
2492 return claimintf(ps, dc.interface);
2493}
2494
2495static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2496{
2497 unsigned num_streams, num_eps;
2498 struct usb_host_endpoint **eps;
2499 struct usb_interface *intf;
2500 int r;
2501
2502 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2503 &eps, &intf);
2504 if (r)
2505 return r;
2506
2507 destroy_async_on_interface(ps,
2508 intf->altsetting[0].desc.bInterfaceNumber);
2509
2510 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2511 kfree(eps);
2512 return r;
2513}
2514
2515static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2516{
2517 unsigned num_eps;
2518 struct usb_host_endpoint **eps;
2519 struct usb_interface *intf;
2520 int r;
2521
2522 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2523 if (r)
2524 return r;
2525
2526 destroy_async_on_interface(ps,
2527 intf->altsetting[0].desc.bInterfaceNumber);
2528
2529 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2530 kfree(eps);
2531 return r;
2532}
2533
2534static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2535{
2536 u32 data;
2537
2538 if (copy_from_user(&data, arg, sizeof(data)))
2539 return -EFAULT;
2540
2541 /* This is a one way operation. Once privileges are
2542 * dropped, you cannot regain them. You may however reissue
2543 * this ioctl to shrink the allowed interfaces mask.
2544 */
2545 ps->interface_allowed_mask &= data;
2546 ps->privileges_dropped = true;
2547
2548 return 0;
2549}
2550
2551static int proc_forbid_suspend(struct usb_dev_state *ps)
2552{
2553 int ret = 0;
2554
2555 if (ps->suspend_allowed) {
2556 ret = usb_autoresume_device(ps->dev);
2557 if (ret == 0)
2558 ps->suspend_allowed = false;
2559 else if (ret != -ENODEV)
2560 ret = -EIO;
2561 }
2562 return ret;
2563}
2564
2565static int proc_allow_suspend(struct usb_dev_state *ps)
2566{
2567 if (!connected(ps))
2568 return -ENODEV;
2569
2570 WRITE_ONCE(ps->not_yet_resumed, 1);
2571 if (!ps->suspend_allowed) {
2572 usb_autosuspend_device(ps->dev);
2573 ps->suspend_allowed = true;
2574 }
2575 return 0;
2576}
2577
2578static int proc_wait_for_resume(struct usb_dev_state *ps)
2579{
2580 int ret;
2581
2582 usb_unlock_device(ps->dev);
2583 ret = wait_event_interruptible(ps->wait_for_resume,
2584 READ_ONCE(ps->not_yet_resumed) == 0);
2585 usb_lock_device(ps->dev);
2586
2587 if (ret != 0)
2588 return -EINTR;
2589 return proc_forbid_suspend(ps);
2590}
2591
2592/*
2593 * NOTE: All requests here that have interface numbers as parameters
2594 * are assuming that somehow the configuration has been prevented from
2595 * changing. But there's no mechanism to ensure that...
2596 */
2597static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2598 void __user *p)
2599{
2600 struct usb_dev_state *ps = file->private_data;
2601 struct inode *inode = file_inode(file);
2602 struct usb_device *dev = ps->dev;
2603 int ret = -ENOTTY;
2604
2605 if (!(file->f_mode & FMODE_WRITE))
2606 return -EPERM;
2607
2608 usb_lock_device(dev);
2609
2610 /* Reap operations are allowed even after disconnection */
2611 switch (cmd) {
2612 case USBDEVFS_REAPURB:
2613 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2614 ret = proc_reapurb(ps, p);
2615 goto done;
2616
2617 case USBDEVFS_REAPURBNDELAY:
2618 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2619 ret = proc_reapurbnonblock(ps, p);
2620 goto done;
2621
2622#ifdef CONFIG_COMPAT
2623 case USBDEVFS_REAPURB32:
2624 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2625 ret = proc_reapurb_compat(ps, p);
2626 goto done;
2627
2628 case USBDEVFS_REAPURBNDELAY32:
2629 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2630 ret = proc_reapurbnonblock_compat(ps, p);
2631 goto done;
2632#endif
2633 }
2634
2635 if (!connected(ps)) {
2636 usb_unlock_device(dev);
2637 return -ENODEV;
2638 }
2639
2640 switch (cmd) {
2641 case USBDEVFS_CONTROL:
2642 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2643 ret = proc_control(ps, p);
2644 if (ret >= 0)
2645 inode_set_mtime_to_ts(inode,
2646 inode_set_ctime_current(inode));
2647 break;
2648
2649 case USBDEVFS_BULK:
2650 snoop(&dev->dev, "%s: BULK\n", __func__);
2651 ret = proc_bulk(ps, p);
2652 if (ret >= 0)
2653 inode_set_mtime_to_ts(inode,
2654 inode_set_ctime_current(inode));
2655 break;
2656
2657 case USBDEVFS_RESETEP:
2658 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2659 ret = proc_resetep(ps, p);
2660 if (ret >= 0)
2661 inode_set_mtime_to_ts(inode,
2662 inode_set_ctime_current(inode));
2663 break;
2664
2665 case USBDEVFS_RESET:
2666 snoop(&dev->dev, "%s: RESET\n", __func__);
2667 ret = proc_resetdevice(ps);
2668 break;
2669
2670 case USBDEVFS_CLEAR_HALT:
2671 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2672 ret = proc_clearhalt(ps, p);
2673 if (ret >= 0)
2674 inode_set_mtime_to_ts(inode,
2675 inode_set_ctime_current(inode));
2676 break;
2677
2678 case USBDEVFS_GETDRIVER:
2679 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2680 ret = proc_getdriver(ps, p);
2681 break;
2682
2683 case USBDEVFS_CONNECTINFO:
2684 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2685 ret = proc_connectinfo(ps, p);
2686 break;
2687
2688 case USBDEVFS_SETINTERFACE:
2689 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2690 ret = proc_setintf(ps, p);
2691 break;
2692
2693 case USBDEVFS_SETCONFIGURATION:
2694 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2695 ret = proc_setconfig(ps, p);
2696 break;
2697
2698 case USBDEVFS_SUBMITURB:
2699 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2700 ret = proc_submiturb(ps, p);
2701 if (ret >= 0)
2702 inode_set_mtime_to_ts(inode,
2703 inode_set_ctime_current(inode));
2704 break;
2705
2706#ifdef CONFIG_COMPAT
2707 case USBDEVFS_CONTROL32:
2708 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2709 ret = proc_control_compat(ps, p);
2710 if (ret >= 0)
2711 inode_set_mtime_to_ts(inode,
2712 inode_set_ctime_current(inode));
2713 break;
2714
2715 case USBDEVFS_BULK32:
2716 snoop(&dev->dev, "%s: BULK32\n", __func__);
2717 ret = proc_bulk_compat(ps, p);
2718 if (ret >= 0)
2719 inode_set_mtime_to_ts(inode,
2720 inode_set_ctime_current(inode));
2721 break;
2722
2723 case USBDEVFS_DISCSIGNAL32:
2724 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2725 ret = proc_disconnectsignal_compat(ps, p);
2726 break;
2727
2728 case USBDEVFS_SUBMITURB32:
2729 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2730 ret = proc_submiturb_compat(ps, p);
2731 if (ret >= 0)
2732 inode_set_mtime_to_ts(inode,
2733 inode_set_ctime_current(inode));
2734 break;
2735
2736 case USBDEVFS_IOCTL32:
2737 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2738 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2739 break;
2740#endif
2741
2742 case USBDEVFS_DISCARDURB:
2743 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2744 ret = proc_unlinkurb(ps, p);
2745 break;
2746
2747 case USBDEVFS_DISCSIGNAL:
2748 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2749 ret = proc_disconnectsignal(ps, p);
2750 break;
2751
2752 case USBDEVFS_CLAIMINTERFACE:
2753 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2754 ret = proc_claiminterface(ps, p);
2755 break;
2756
2757 case USBDEVFS_RELEASEINTERFACE:
2758 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2759 ret = proc_releaseinterface(ps, p);
2760 break;
2761
2762 case USBDEVFS_IOCTL:
2763 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2764 ret = proc_ioctl_default(ps, p);
2765 break;
2766
2767 case USBDEVFS_CLAIM_PORT:
2768 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2769 ret = proc_claim_port(ps, p);
2770 break;
2771
2772 case USBDEVFS_RELEASE_PORT:
2773 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2774 ret = proc_release_port(ps, p);
2775 break;
2776 case USBDEVFS_GET_CAPABILITIES:
2777 ret = proc_get_capabilities(ps, p);
2778 break;
2779 case USBDEVFS_DISCONNECT_CLAIM:
2780 ret = proc_disconnect_claim(ps, p);
2781 break;
2782 case USBDEVFS_ALLOC_STREAMS:
2783 ret = proc_alloc_streams(ps, p);
2784 break;
2785 case USBDEVFS_FREE_STREAMS:
2786 ret = proc_free_streams(ps, p);
2787 break;
2788 case USBDEVFS_DROP_PRIVILEGES:
2789 ret = proc_drop_privileges(ps, p);
2790 break;
2791 case USBDEVFS_GET_SPEED:
2792 ret = ps->dev->speed;
2793 break;
2794 case USBDEVFS_FORBID_SUSPEND:
2795 ret = proc_forbid_suspend(ps);
2796 break;
2797 case USBDEVFS_ALLOW_SUSPEND:
2798 ret = proc_allow_suspend(ps);
2799 break;
2800 case USBDEVFS_WAIT_FOR_RESUME:
2801 ret = proc_wait_for_resume(ps);
2802 break;
2803 }
2804
2805 /* Handle variable-length commands */
2806 switch (cmd & ~IOCSIZE_MASK) {
2807 case USBDEVFS_CONNINFO_EX(0):
2808 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2809 break;
2810 }
2811
2812 done:
2813 usb_unlock_device(dev);
2814 if (ret >= 0)
2815 inode_set_atime_to_ts(inode, current_time(inode));
2816 return ret;
2817}
2818
2819static long usbdev_ioctl(struct file *file, unsigned int cmd,
2820 unsigned long arg)
2821{
2822 int ret;
2823
2824 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2825
2826 return ret;
2827}
2828
2829/* No kernel lock - fine */
2830static __poll_t usbdev_poll(struct file *file,
2831 struct poll_table_struct *wait)
2832{
2833 struct usb_dev_state *ps = file->private_data;
2834 __poll_t mask = 0;
2835
2836 poll_wait(file, &ps->wait, wait);
2837 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2838 mask |= EPOLLOUT | EPOLLWRNORM;
2839 if (!connected(ps))
2840 mask |= EPOLLHUP;
2841 if (list_empty(&ps->list))
2842 mask |= EPOLLERR;
2843 return mask;
2844}
2845
2846const struct file_operations usbdev_file_operations = {
2847 .owner = THIS_MODULE,
2848 .llseek = no_seek_end_llseek,
2849 .read = usbdev_read,
2850 .poll = usbdev_poll,
2851 .unlocked_ioctl = usbdev_ioctl,
2852 .compat_ioctl = compat_ptr_ioctl,
2853 .mmap = usbdev_mmap,
2854 .open = usbdev_open,
2855 .release = usbdev_release,
2856};
2857
2858static void usbdev_remove(struct usb_device *udev)
2859{
2860 struct usb_dev_state *ps;
2861
2862 /* Protect against simultaneous resume */
2863 mutex_lock(&usbfs_mutex);
2864 while (!list_empty(&udev->filelist)) {
2865 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2866 destroy_all_async(ps);
2867 wake_up_all(&ps->wait);
2868 WRITE_ONCE(ps->not_yet_resumed, 0);
2869 wake_up_all(&ps->wait_for_resume);
2870 list_del_init(&ps->list);
2871 if (ps->discsignr)
2872 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2873 ps->disc_pid, ps->cred);
2874 }
2875 mutex_unlock(&usbfs_mutex);
2876}
2877
2878static int usbdev_notify(struct notifier_block *self,
2879 unsigned long action, void *dev)
2880{
2881 switch (action) {
2882 case USB_DEVICE_ADD:
2883 break;
2884 case USB_DEVICE_REMOVE:
2885 usbdev_remove(dev);
2886 break;
2887 }
2888 return NOTIFY_OK;
2889}
2890
2891static struct notifier_block usbdev_nb = {
2892 .notifier_call = usbdev_notify,
2893};
2894
2895static struct cdev usb_device_cdev;
2896
2897int __init usb_devio_init(void)
2898{
2899 int retval;
2900
2901 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2902 "usb_device");
2903 if (retval) {
2904 printk(KERN_ERR "Unable to register minors for usb_device\n");
2905 goto out;
2906 }
2907 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2908 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2909 if (retval) {
2910 printk(KERN_ERR "Unable to get usb_device major %d\n",
2911 USB_DEVICE_MAJOR);
2912 goto error_cdev;
2913 }
2914 usb_register_notify(&usbdev_nb);
2915out:
2916 return retval;
2917
2918error_cdev:
2919 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2920 goto out;
2921}
2922
2923void usb_devio_cleanup(void)
2924{
2925 usb_unregister_notify(&usbdev_nb);
2926 cdev_del(&usb_device_cdev);
2927 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2928}