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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/cdev.h>
36#include <linux/notifier.h>
37#include <linux/security.h>
38#include <linux/user_namespace.h>
39#include <linux/scatterlist.h>
40#include <linux/uaccess.h>
41#include <linux/dma-mapping.h>
42#include <asm/byteorder.h>
43#include <linux/moduleparam.h>
44
45#include "usb.h"
46
47#define USB_MAXBUS 64
48#define USB_DEVICE_MAX (USB_MAXBUS * 128)
49#define USB_SG_SIZE 16384 /* split-size for large txs */
50
51/* Mutual exclusion for removal, open, and release */
52DEFINE_MUTEX(usbfs_mutex);
53
54struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
57 struct file *file;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
64 struct pid *disc_pid;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 disabled_bulk_eps;
69 bool privileges_dropped;
70 unsigned long interface_allowed_mask;
71};
72
73struct usb_memory {
74 struct list_head memlist;
75 int vma_use_count;
76 int urb_use_count;
77 u32 size;
78 void *mem;
79 dma_addr_t dma_handle;
80 unsigned long vm_start;
81 struct usb_dev_state *ps;
82};
83
84struct async {
85 struct list_head asynclist;
86 struct usb_dev_state *ps;
87 struct pid *pid;
88 const struct cred *cred;
89 unsigned int signr;
90 unsigned int ifnum;
91 void __user *userbuffer;
92 void __user *userurb;
93 struct urb *urb;
94 struct usb_memory *usbm;
95 unsigned int mem_usage;
96 int status;
97 u8 bulk_addr;
98 u8 bulk_status;
99};
100
101static bool usbfs_snoop;
102module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
103MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
104
105static unsigned usbfs_snoop_max = 65536;
106module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
107MODULE_PARM_DESC(usbfs_snoop_max,
108 "maximum number of bytes to print while snooping");
109
110#define snoop(dev, format, arg...) \
111 do { \
112 if (usbfs_snoop) \
113 dev_info(dev, format, ## arg); \
114 } while (0)
115
116enum snoop_when {
117 SUBMIT, COMPLETE
118};
119
120#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
121
122/* Limit on the total amount of memory we can allocate for transfers */
123static u32 usbfs_memory_mb = 16;
124module_param(usbfs_memory_mb, uint, 0644);
125MODULE_PARM_DESC(usbfs_memory_mb,
126 "maximum MB allowed for usbfs buffers (0 = no limit)");
127
128/* Hard limit, necessary to avoid arithmetic overflow */
129#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
130
131static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
132
133/* Check whether it's okay to allocate more memory for a transfer */
134static int usbfs_increase_memory_usage(u64 amount)
135{
136 u64 lim;
137
138 lim = READ_ONCE(usbfs_memory_mb);
139 lim <<= 20;
140
141 atomic64_add(amount, &usbfs_memory_usage);
142
143 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
144 atomic64_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 return 0;
149}
150
151/* Memory for a transfer is being deallocated */
152static void usbfs_decrease_memory_usage(u64 amount)
153{
154 atomic64_sub(amount, &usbfs_memory_usage);
155}
156
157static int connected(struct usb_dev_state *ps)
158{
159 return (!list_empty(&ps->list) &&
160 ps->dev->state != USB_STATE_NOTATTACHED);
161}
162
163static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
164{
165 struct usb_dev_state *ps = usbm->ps;
166 unsigned long flags;
167
168 spin_lock_irqsave(&ps->lock, flags);
169 --*count;
170 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
171 list_del(&usbm->memlist);
172 spin_unlock_irqrestore(&ps->lock, flags);
173
174 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
175 usbm->dma_handle);
176 usbfs_decrease_memory_usage(
177 usbm->size + sizeof(struct usb_memory));
178 kfree(usbm);
179 } else {
180 spin_unlock_irqrestore(&ps->lock, flags);
181 }
182}
183
184static void usbdev_vm_open(struct vm_area_struct *vma)
185{
186 struct usb_memory *usbm = vma->vm_private_data;
187 unsigned long flags;
188
189 spin_lock_irqsave(&usbm->ps->lock, flags);
190 ++usbm->vma_use_count;
191 spin_unlock_irqrestore(&usbm->ps->lock, flags);
192}
193
194static void usbdev_vm_close(struct vm_area_struct *vma)
195{
196 struct usb_memory *usbm = vma->vm_private_data;
197
198 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
199}
200
201static const struct vm_operations_struct usbdev_vm_ops = {
202 .open = usbdev_vm_open,
203 .close = usbdev_vm_close
204};
205
206static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
207{
208 struct usb_memory *usbm = NULL;
209 struct usb_dev_state *ps = file->private_data;
210 size_t size = vma->vm_end - vma->vm_start;
211 void *mem;
212 unsigned long flags;
213 dma_addr_t dma_handle;
214 int ret;
215
216 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
217 if (ret)
218 goto error;
219
220 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
221 if (!usbm) {
222 ret = -ENOMEM;
223 goto error_decrease_mem;
224 }
225
226 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
227 &dma_handle);
228 if (!mem) {
229 ret = -ENOMEM;
230 goto error_free_usbm;
231 }
232
233 memset(mem, 0, size);
234
235 usbm->mem = mem;
236 usbm->dma_handle = dma_handle;
237 usbm->size = size;
238 usbm->ps = ps;
239 usbm->vm_start = vma->vm_start;
240 usbm->vma_use_count = 1;
241 INIT_LIST_HEAD(&usbm->memlist);
242
243 if (remap_pfn_range(vma, vma->vm_start,
244 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
245 size, vma->vm_page_prot) < 0) {
246 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
247 return -EAGAIN;
248 }
249
250 vma->vm_flags |= VM_IO;
251 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
252 vma->vm_ops = &usbdev_vm_ops;
253 vma->vm_private_data = usbm;
254
255 spin_lock_irqsave(&ps->lock, flags);
256 list_add_tail(&usbm->memlist, &ps->memory_list);
257 spin_unlock_irqrestore(&ps->lock, flags);
258
259 return 0;
260
261error_free_usbm:
262 kfree(usbm);
263error_decrease_mem:
264 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
265error:
266 return ret;
267}
268
269static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
270 loff_t *ppos)
271{
272 struct usb_dev_state *ps = file->private_data;
273 struct usb_device *dev = ps->dev;
274 ssize_t ret = 0;
275 unsigned len;
276 loff_t pos;
277 int i;
278
279 pos = *ppos;
280 usb_lock_device(dev);
281 if (!connected(ps)) {
282 ret = -ENODEV;
283 goto err;
284 } else if (pos < 0) {
285 ret = -EINVAL;
286 goto err;
287 }
288
289 if (pos < sizeof(struct usb_device_descriptor)) {
290 /* 18 bytes - fits on the stack */
291 struct usb_device_descriptor temp_desc;
292
293 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
294 le16_to_cpus(&temp_desc.bcdUSB);
295 le16_to_cpus(&temp_desc.idVendor);
296 le16_to_cpus(&temp_desc.idProduct);
297 le16_to_cpus(&temp_desc.bcdDevice);
298
299 len = sizeof(struct usb_device_descriptor) - pos;
300 if (len > nbytes)
301 len = nbytes;
302 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
303 ret = -EFAULT;
304 goto err;
305 }
306
307 *ppos += len;
308 buf += len;
309 nbytes -= len;
310 ret += len;
311 }
312
313 pos = sizeof(struct usb_device_descriptor);
314 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
315 struct usb_config_descriptor *config =
316 (struct usb_config_descriptor *)dev->rawdescriptors[i];
317 unsigned int length = le16_to_cpu(config->wTotalLength);
318
319 if (*ppos < pos + length) {
320
321 /* The descriptor may claim to be longer than it
322 * really is. Here is the actual allocated length. */
323 unsigned alloclen =
324 le16_to_cpu(dev->config[i].desc.wTotalLength);
325
326 len = length - (*ppos - pos);
327 if (len > nbytes)
328 len = nbytes;
329
330 /* Simply don't write (skip over) unallocated parts */
331 if (alloclen > (*ppos - pos)) {
332 alloclen -= (*ppos - pos);
333 if (copy_to_user(buf,
334 dev->rawdescriptors[i] + (*ppos - pos),
335 min(len, alloclen))) {
336 ret = -EFAULT;
337 goto err;
338 }
339 }
340
341 *ppos += len;
342 buf += len;
343 nbytes -= len;
344 ret += len;
345 }
346
347 pos += length;
348 }
349
350err:
351 usb_unlock_device(dev);
352 return ret;
353}
354
355/*
356 * async list handling
357 */
358
359static struct async *alloc_async(unsigned int numisoframes)
360{
361 struct async *as;
362
363 as = kzalloc(sizeof(struct async), GFP_KERNEL);
364 if (!as)
365 return NULL;
366 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
367 if (!as->urb) {
368 kfree(as);
369 return NULL;
370 }
371 return as;
372}
373
374static void free_async(struct async *as)
375{
376 int i;
377
378 put_pid(as->pid);
379 if (as->cred)
380 put_cred(as->cred);
381 for (i = 0; i < as->urb->num_sgs; i++) {
382 if (sg_page(&as->urb->sg[i]))
383 kfree(sg_virt(&as->urb->sg[i]));
384 }
385
386 kfree(as->urb->sg);
387 if (as->usbm == NULL)
388 kfree(as->urb->transfer_buffer);
389 else
390 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
391
392 kfree(as->urb->setup_packet);
393 usb_free_urb(as->urb);
394 usbfs_decrease_memory_usage(as->mem_usage);
395 kfree(as);
396}
397
398static void async_newpending(struct async *as)
399{
400 struct usb_dev_state *ps = as->ps;
401 unsigned long flags;
402
403 spin_lock_irqsave(&ps->lock, flags);
404 list_add_tail(&as->asynclist, &ps->async_pending);
405 spin_unlock_irqrestore(&ps->lock, flags);
406}
407
408static void async_removepending(struct async *as)
409{
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_del_init(&as->asynclist);
415 spin_unlock_irqrestore(&ps->lock, flags);
416}
417
418static struct async *async_getcompleted(struct usb_dev_state *ps)
419{
420 unsigned long flags;
421 struct async *as = NULL;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 if (!list_empty(&ps->async_completed)) {
425 as = list_entry(ps->async_completed.next, struct async,
426 asynclist);
427 list_del_init(&as->asynclist);
428 }
429 spin_unlock_irqrestore(&ps->lock, flags);
430 return as;
431}
432
433static struct async *async_getpending(struct usb_dev_state *ps,
434 void __user *userurb)
435{
436 struct async *as;
437
438 list_for_each_entry(as, &ps->async_pending, asynclist)
439 if (as->userurb == userurb) {
440 list_del_init(&as->asynclist);
441 return as;
442 }
443
444 return NULL;
445}
446
447static void snoop_urb(struct usb_device *udev,
448 void __user *userurb, int pipe, unsigned length,
449 int timeout_or_status, enum snoop_when when,
450 unsigned char *data, unsigned data_len)
451{
452 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
453 static const char *dirs[] = {"out", "in"};
454 int ep;
455 const char *t, *d;
456
457 if (!usbfs_snoop)
458 return;
459
460 ep = usb_pipeendpoint(pipe);
461 t = types[usb_pipetype(pipe)];
462 d = dirs[!!usb_pipein(pipe)];
463
464 if (userurb) { /* Async */
465 if (when == SUBMIT)
466 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
467 "length %u\n",
468 userurb, ep, t, d, length);
469 else
470 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
471 "actual_length %u status %d\n",
472 userurb, ep, t, d, length,
473 timeout_or_status);
474 } else {
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
477 "timeout %d\n",
478 ep, t, d, length, timeout_or_status);
479 else
480 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
481 "status %d\n",
482 ep, t, d, length, timeout_or_status);
483 }
484
485 data_len = min(data_len, usbfs_snoop_max);
486 if (data && data_len > 0) {
487 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
488 data, data_len, 1);
489 }
490}
491
492static void snoop_urb_data(struct urb *urb, unsigned len)
493{
494 int i, size;
495
496 len = min(len, usbfs_snoop_max);
497 if (!usbfs_snoop || len == 0)
498 return;
499
500 if (urb->num_sgs == 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
502 urb->transfer_buffer, len, 1);
503 return;
504 }
505
506 for (i = 0; i < urb->num_sgs && len; i++) {
507 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
508 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
509 sg_virt(&urb->sg[i]), size, 1);
510 len -= size;
511 }
512}
513
514static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
515{
516 unsigned i, len, size;
517
518 if (urb->number_of_packets > 0) /* Isochronous */
519 len = urb->transfer_buffer_length;
520 else /* Non-Isoc */
521 len = urb->actual_length;
522
523 if (urb->num_sgs == 0) {
524 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
525 return -EFAULT;
526 return 0;
527 }
528
529 for (i = 0; i < urb->num_sgs && len; i++) {
530 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
531 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
532 return -EFAULT;
533 userbuffer += size;
534 len -= size;
535 }
536
537 return 0;
538}
539
540#define AS_CONTINUATION 1
541#define AS_UNLINK 2
542
543static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
544__releases(ps->lock)
545__acquires(ps->lock)
546{
547 struct urb *urb;
548 struct async *as;
549
550 /* Mark all the pending URBs that match bulk_addr, up to but not
551 * including the first one without AS_CONTINUATION. If such an
552 * URB is encountered then a new transfer has already started so
553 * the endpoint doesn't need to be disabled; otherwise it does.
554 */
555 list_for_each_entry(as, &ps->async_pending, asynclist) {
556 if (as->bulk_addr == bulk_addr) {
557 if (as->bulk_status != AS_CONTINUATION)
558 goto rescan;
559 as->bulk_status = AS_UNLINK;
560 as->bulk_addr = 0;
561 }
562 }
563 ps->disabled_bulk_eps |= (1 << bulk_addr);
564
565 /* Now carefully unlink all the marked pending URBs */
566 rescan:
567 list_for_each_entry(as, &ps->async_pending, asynclist) {
568 if (as->bulk_status == AS_UNLINK) {
569 as->bulk_status = 0; /* Only once */
570 urb = as->urb;
571 usb_get_urb(urb);
572 spin_unlock(&ps->lock); /* Allow completions */
573 usb_unlink_urb(urb);
574 usb_put_urb(urb);
575 spin_lock(&ps->lock);
576 goto rescan;
577 }
578 }
579}
580
581static void async_completed(struct urb *urb)
582{
583 struct async *as = urb->context;
584 struct usb_dev_state *ps = as->ps;
585 struct siginfo sinfo;
586 struct pid *pid = NULL;
587 const struct cred *cred = NULL;
588 int signr;
589
590 spin_lock(&ps->lock);
591 list_move_tail(&as->asynclist, &ps->async_completed);
592 as->status = urb->status;
593 signr = as->signr;
594 if (signr) {
595 clear_siginfo(&sinfo);
596 sinfo.si_signo = as->signr;
597 sinfo.si_errno = as->status;
598 sinfo.si_code = SI_ASYNCIO;
599 sinfo.si_addr = as->userurb;
600 pid = get_pid(as->pid);
601 cred = get_cred(as->cred);
602 }
603 snoop(&urb->dev->dev, "urb complete\n");
604 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
605 as->status, COMPLETE, NULL, 0);
606 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
607 snoop_urb_data(urb, urb->actual_length);
608
609 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
610 as->status != -ENOENT)
611 cancel_bulk_urbs(ps, as->bulk_addr);
612
613 wake_up(&ps->wait);
614 spin_unlock(&ps->lock);
615
616 if (signr) {
617 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
618 put_pid(pid);
619 put_cred(cred);
620 }
621}
622
623static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
624{
625 struct urb *urb;
626 struct async *as;
627 unsigned long flags;
628
629 spin_lock_irqsave(&ps->lock, flags);
630 while (!list_empty(list)) {
631 as = list_entry(list->next, struct async, asynclist);
632 list_del_init(&as->asynclist);
633 urb = as->urb;
634 usb_get_urb(urb);
635
636 /* drop the spinlock so the completion handler can run */
637 spin_unlock_irqrestore(&ps->lock, flags);
638 usb_kill_urb(urb);
639 usb_put_urb(urb);
640 spin_lock_irqsave(&ps->lock, flags);
641 }
642 spin_unlock_irqrestore(&ps->lock, flags);
643}
644
645static void destroy_async_on_interface(struct usb_dev_state *ps,
646 unsigned int ifnum)
647{
648 struct list_head *p, *q, hitlist;
649 unsigned long flags;
650
651 INIT_LIST_HEAD(&hitlist);
652 spin_lock_irqsave(&ps->lock, flags);
653 list_for_each_safe(p, q, &ps->async_pending)
654 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
655 list_move_tail(p, &hitlist);
656 spin_unlock_irqrestore(&ps->lock, flags);
657 destroy_async(ps, &hitlist);
658}
659
660static void destroy_all_async(struct usb_dev_state *ps)
661{
662 destroy_async(ps, &ps->async_pending);
663}
664
665/*
666 * interface claims are made only at the request of user level code,
667 * which can also release them (explicitly or by closing files).
668 * they're also undone when devices disconnect.
669 */
670
671static int driver_probe(struct usb_interface *intf,
672 const struct usb_device_id *id)
673{
674 return -ENODEV;
675}
676
677static void driver_disconnect(struct usb_interface *intf)
678{
679 struct usb_dev_state *ps = usb_get_intfdata(intf);
680 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
681
682 if (!ps)
683 return;
684
685 /* NOTE: this relies on usbcore having canceled and completed
686 * all pending I/O requests; 2.6 does that.
687 */
688
689 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
690 clear_bit(ifnum, &ps->ifclaimed);
691 else
692 dev_warn(&intf->dev, "interface number %u out of range\n",
693 ifnum);
694
695 usb_set_intfdata(intf, NULL);
696
697 /* force async requests to complete */
698 destroy_async_on_interface(ps, ifnum);
699}
700
701/* The following routines are merely placeholders. There is no way
702 * to inform a user task about suspend or resumes.
703 */
704static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
705{
706 return 0;
707}
708
709static int driver_resume(struct usb_interface *intf)
710{
711 return 0;
712}
713
714struct usb_driver usbfs_driver = {
715 .name = "usbfs",
716 .probe = driver_probe,
717 .disconnect = driver_disconnect,
718 .suspend = driver_suspend,
719 .resume = driver_resume,
720};
721
722static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
723{
724 struct usb_device *dev = ps->dev;
725 struct usb_interface *intf;
726 int err;
727
728 if (ifnum >= 8*sizeof(ps->ifclaimed))
729 return -EINVAL;
730 /* already claimed */
731 if (test_bit(ifnum, &ps->ifclaimed))
732 return 0;
733
734 if (ps->privileges_dropped &&
735 !test_bit(ifnum, &ps->interface_allowed_mask))
736 return -EACCES;
737
738 intf = usb_ifnum_to_if(dev, ifnum);
739 if (!intf)
740 err = -ENOENT;
741 else
742 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
743 if (err == 0)
744 set_bit(ifnum, &ps->ifclaimed);
745 return err;
746}
747
748static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
749{
750 struct usb_device *dev;
751 struct usb_interface *intf;
752 int err;
753
754 err = -EINVAL;
755 if (ifnum >= 8*sizeof(ps->ifclaimed))
756 return err;
757 dev = ps->dev;
758 intf = usb_ifnum_to_if(dev, ifnum);
759 if (!intf)
760 err = -ENOENT;
761 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
762 usb_driver_release_interface(&usbfs_driver, intf);
763 err = 0;
764 }
765 return err;
766}
767
768static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
769{
770 if (ps->dev->state != USB_STATE_CONFIGURED)
771 return -EHOSTUNREACH;
772 if (ifnum >= 8*sizeof(ps->ifclaimed))
773 return -EINVAL;
774 if (test_bit(ifnum, &ps->ifclaimed))
775 return 0;
776 /* if not yet claimed, claim it for the driver */
777 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
778 "interface %u before use\n", task_pid_nr(current),
779 current->comm, ifnum);
780 return claimintf(ps, ifnum);
781}
782
783static int findintfep(struct usb_device *dev, unsigned int ep)
784{
785 unsigned int i, j, e;
786 struct usb_interface *intf;
787 struct usb_host_interface *alts;
788 struct usb_endpoint_descriptor *endpt;
789
790 if (ep & ~(USB_DIR_IN|0xf))
791 return -EINVAL;
792 if (!dev->actconfig)
793 return -ESRCH;
794 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
795 intf = dev->actconfig->interface[i];
796 for (j = 0; j < intf->num_altsetting; j++) {
797 alts = &intf->altsetting[j];
798 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
799 endpt = &alts->endpoint[e].desc;
800 if (endpt->bEndpointAddress == ep)
801 return alts->desc.bInterfaceNumber;
802 }
803 }
804 }
805 return -ENOENT;
806}
807
808static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
809 unsigned int request, unsigned int index)
810{
811 int ret = 0;
812 struct usb_host_interface *alt_setting;
813
814 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
815 && ps->dev->state != USB_STATE_ADDRESS
816 && ps->dev->state != USB_STATE_CONFIGURED)
817 return -EHOSTUNREACH;
818 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
819 return 0;
820
821 /*
822 * check for the special corner case 'get_device_id' in the printer
823 * class specification, which we always want to allow as it is used
824 * to query things like ink level, etc.
825 */
826 if (requesttype == 0xa1 && request == 0) {
827 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
828 index >> 8, index & 0xff);
829 if (alt_setting
830 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
831 return 0;
832 }
833
834 index &= 0xff;
835 switch (requesttype & USB_RECIP_MASK) {
836 case USB_RECIP_ENDPOINT:
837 if ((index & ~USB_DIR_IN) == 0)
838 return 0;
839 ret = findintfep(ps->dev, index);
840 if (ret < 0) {
841 /*
842 * Some not fully compliant Win apps seem to get
843 * index wrong and have the endpoint number here
844 * rather than the endpoint address (with the
845 * correct direction). Win does let this through,
846 * so we'll not reject it here but leave it to
847 * the device to not break KVM. But we warn.
848 */
849 ret = findintfep(ps->dev, index ^ 0x80);
850 if (ret >= 0)
851 dev_info(&ps->dev->dev,
852 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
853 __func__, task_pid_nr(current),
854 current->comm, index, index ^ 0x80);
855 }
856 if (ret >= 0)
857 ret = checkintf(ps, ret);
858 break;
859
860 case USB_RECIP_INTERFACE:
861 ret = checkintf(ps, index);
862 break;
863 }
864 return ret;
865}
866
867static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
868 unsigned char ep)
869{
870 if (ep & USB_ENDPOINT_DIR_MASK)
871 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
872 else
873 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
874}
875
876static int parse_usbdevfs_streams(struct usb_dev_state *ps,
877 struct usbdevfs_streams __user *streams,
878 unsigned int *num_streams_ret,
879 unsigned int *num_eps_ret,
880 struct usb_host_endpoint ***eps_ret,
881 struct usb_interface **intf_ret)
882{
883 unsigned int i, num_streams, num_eps;
884 struct usb_host_endpoint **eps;
885 struct usb_interface *intf = NULL;
886 unsigned char ep;
887 int ifnum, ret;
888
889 if (get_user(num_streams, &streams->num_streams) ||
890 get_user(num_eps, &streams->num_eps))
891 return -EFAULT;
892
893 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
894 return -EINVAL;
895
896 /* The XHCI controller allows max 2 ^ 16 streams */
897 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
898 return -EINVAL;
899
900 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
901 if (!eps)
902 return -ENOMEM;
903
904 for (i = 0; i < num_eps; i++) {
905 if (get_user(ep, &streams->eps[i])) {
906 ret = -EFAULT;
907 goto error;
908 }
909 eps[i] = ep_to_host_endpoint(ps->dev, ep);
910 if (!eps[i]) {
911 ret = -EINVAL;
912 goto error;
913 }
914
915 /* usb_alloc/free_streams operate on an usb_interface */
916 ifnum = findintfep(ps->dev, ep);
917 if (ifnum < 0) {
918 ret = ifnum;
919 goto error;
920 }
921
922 if (i == 0) {
923 ret = checkintf(ps, ifnum);
924 if (ret < 0)
925 goto error;
926 intf = usb_ifnum_to_if(ps->dev, ifnum);
927 } else {
928 /* Verify all eps belong to the same interface */
929 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
930 ret = -EINVAL;
931 goto error;
932 }
933 }
934 }
935
936 if (num_streams_ret)
937 *num_streams_ret = num_streams;
938 *num_eps_ret = num_eps;
939 *eps_ret = eps;
940 *intf_ret = intf;
941
942 return 0;
943
944error:
945 kfree(eps);
946 return ret;
947}
948
949static int match_devt(struct device *dev, void *data)
950{
951 return dev->devt == (dev_t) (unsigned long) data;
952}
953
954static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
955{
956 struct device *dev;
957
958 dev = bus_find_device(&usb_bus_type, NULL,
959 (void *) (unsigned long) devt, match_devt);
960 if (!dev)
961 return NULL;
962 return to_usb_device(dev);
963}
964
965/*
966 * file operations
967 */
968static int usbdev_open(struct inode *inode, struct file *file)
969{
970 struct usb_device *dev = NULL;
971 struct usb_dev_state *ps;
972 int ret;
973
974 ret = -ENOMEM;
975 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
976 if (!ps)
977 goto out_free_ps;
978
979 ret = -ENODEV;
980
981 /* Protect against simultaneous removal or release */
982 mutex_lock(&usbfs_mutex);
983
984 /* usbdev device-node */
985 if (imajor(inode) == USB_DEVICE_MAJOR)
986 dev = usbdev_lookup_by_devt(inode->i_rdev);
987
988 mutex_unlock(&usbfs_mutex);
989
990 if (!dev)
991 goto out_free_ps;
992
993 usb_lock_device(dev);
994 if (dev->state == USB_STATE_NOTATTACHED)
995 goto out_unlock_device;
996
997 ret = usb_autoresume_device(dev);
998 if (ret)
999 goto out_unlock_device;
1000
1001 ps->dev = dev;
1002 ps->file = file;
1003 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1004 spin_lock_init(&ps->lock);
1005 INIT_LIST_HEAD(&ps->list);
1006 INIT_LIST_HEAD(&ps->async_pending);
1007 INIT_LIST_HEAD(&ps->async_completed);
1008 INIT_LIST_HEAD(&ps->memory_list);
1009 init_waitqueue_head(&ps->wait);
1010 ps->disc_pid = get_pid(task_pid(current));
1011 ps->cred = get_current_cred();
1012 smp_wmb();
1013 list_add_tail(&ps->list, &dev->filelist);
1014 file->private_data = ps;
1015 usb_unlock_device(dev);
1016 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1017 current->comm);
1018 return ret;
1019
1020 out_unlock_device:
1021 usb_unlock_device(dev);
1022 usb_put_dev(dev);
1023 out_free_ps:
1024 kfree(ps);
1025 return ret;
1026}
1027
1028static int usbdev_release(struct inode *inode, struct file *file)
1029{
1030 struct usb_dev_state *ps = file->private_data;
1031 struct usb_device *dev = ps->dev;
1032 unsigned int ifnum;
1033 struct async *as;
1034
1035 usb_lock_device(dev);
1036 usb_hub_release_all_ports(dev, ps);
1037
1038 list_del_init(&ps->list);
1039
1040 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1041 ifnum++) {
1042 if (test_bit(ifnum, &ps->ifclaimed))
1043 releaseintf(ps, ifnum);
1044 }
1045 destroy_all_async(ps);
1046 usb_autosuspend_device(dev);
1047 usb_unlock_device(dev);
1048 usb_put_dev(dev);
1049 put_pid(ps->disc_pid);
1050 put_cred(ps->cred);
1051
1052 as = async_getcompleted(ps);
1053 while (as) {
1054 free_async(as);
1055 as = async_getcompleted(ps);
1056 }
1057
1058 kfree(ps);
1059 return 0;
1060}
1061
1062static int proc_control(struct usb_dev_state *ps, void __user *arg)
1063{
1064 struct usb_device *dev = ps->dev;
1065 struct usbdevfs_ctrltransfer ctrl;
1066 unsigned int tmo;
1067 unsigned char *tbuf;
1068 unsigned wLength;
1069 int i, pipe, ret;
1070
1071 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1072 return -EFAULT;
1073 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1074 ctrl.wIndex);
1075 if (ret)
1076 return ret;
1077 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1078 if (wLength > PAGE_SIZE)
1079 return -EINVAL;
1080 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1081 sizeof(struct usb_ctrlrequest));
1082 if (ret)
1083 return ret;
1084 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1085 if (!tbuf) {
1086 ret = -ENOMEM;
1087 goto done;
1088 }
1089 tmo = ctrl.timeout;
1090 snoop(&dev->dev, "control urb: bRequestType=%02x "
1091 "bRequest=%02x wValue=%04x "
1092 "wIndex=%04x wLength=%04x\n",
1093 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1094 ctrl.wIndex, ctrl.wLength);
1095 if (ctrl.bRequestType & 0x80) {
1096 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1097 ctrl.wLength)) {
1098 ret = -EINVAL;
1099 goto done;
1100 }
1101 pipe = usb_rcvctrlpipe(dev, 0);
1102 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1103
1104 usb_unlock_device(dev);
1105 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1106 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1107 tbuf, ctrl.wLength, tmo);
1108 usb_lock_device(dev);
1109 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1110 tbuf, max(i, 0));
1111 if ((i > 0) && ctrl.wLength) {
1112 if (copy_to_user(ctrl.data, tbuf, i)) {
1113 ret = -EFAULT;
1114 goto done;
1115 }
1116 }
1117 } else {
1118 if (ctrl.wLength) {
1119 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1120 ret = -EFAULT;
1121 goto done;
1122 }
1123 }
1124 pipe = usb_sndctrlpipe(dev, 0);
1125 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1126 tbuf, ctrl.wLength);
1127
1128 usb_unlock_device(dev);
1129 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1130 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1131 tbuf, ctrl.wLength, tmo);
1132 usb_lock_device(dev);
1133 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1134 }
1135 if (i < 0 && i != -EPIPE) {
1136 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1137 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1138 current->comm, ctrl.bRequestType, ctrl.bRequest,
1139 ctrl.wLength, i);
1140 }
1141 ret = i;
1142 done:
1143 free_page((unsigned long) tbuf);
1144 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1145 sizeof(struct usb_ctrlrequest));
1146 return ret;
1147}
1148
1149static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1150{
1151 struct usb_device *dev = ps->dev;
1152 struct usbdevfs_bulktransfer bulk;
1153 unsigned int tmo, len1, pipe;
1154 int len2;
1155 unsigned char *tbuf;
1156 int i, ret;
1157
1158 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1159 return -EFAULT;
1160 ret = findintfep(ps->dev, bulk.ep);
1161 if (ret < 0)
1162 return ret;
1163 ret = checkintf(ps, ret);
1164 if (ret)
1165 return ret;
1166 if (bulk.ep & USB_DIR_IN)
1167 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1168 else
1169 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1170 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1171 return -EINVAL;
1172 len1 = bulk.len;
1173 if (len1 >= (INT_MAX - sizeof(struct urb)))
1174 return -EINVAL;
1175 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1176 if (ret)
1177 return ret;
1178 tbuf = kmalloc(len1, GFP_KERNEL);
1179 if (!tbuf) {
1180 ret = -ENOMEM;
1181 goto done;
1182 }
1183 tmo = bulk.timeout;
1184 if (bulk.ep & 0x80) {
1185 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1186 ret = -EINVAL;
1187 goto done;
1188 }
1189 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1190
1191 usb_unlock_device(dev);
1192 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1193 usb_lock_device(dev);
1194 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1195
1196 if (!i && len2) {
1197 if (copy_to_user(bulk.data, tbuf, len2)) {
1198 ret = -EFAULT;
1199 goto done;
1200 }
1201 }
1202 } else {
1203 if (len1) {
1204 if (copy_from_user(tbuf, bulk.data, len1)) {
1205 ret = -EFAULT;
1206 goto done;
1207 }
1208 }
1209 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1210
1211 usb_unlock_device(dev);
1212 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1213 usb_lock_device(dev);
1214 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1215 }
1216 ret = (i < 0 ? i : len2);
1217 done:
1218 kfree(tbuf);
1219 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1220 return ret;
1221}
1222
1223static void check_reset_of_active_ep(struct usb_device *udev,
1224 unsigned int epnum, char *ioctl_name)
1225{
1226 struct usb_host_endpoint **eps;
1227 struct usb_host_endpoint *ep;
1228
1229 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1230 ep = eps[epnum & 0x0f];
1231 if (ep && !list_empty(&ep->urb_list))
1232 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1233 task_pid_nr(current), current->comm,
1234 ioctl_name, epnum);
1235}
1236
1237static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1238{
1239 unsigned int ep;
1240 int ret;
1241
1242 if (get_user(ep, (unsigned int __user *)arg))
1243 return -EFAULT;
1244 ret = findintfep(ps->dev, ep);
1245 if (ret < 0)
1246 return ret;
1247 ret = checkintf(ps, ret);
1248 if (ret)
1249 return ret;
1250 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1251 usb_reset_endpoint(ps->dev, ep);
1252 return 0;
1253}
1254
1255static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1256{
1257 unsigned int ep;
1258 int pipe;
1259 int ret;
1260
1261 if (get_user(ep, (unsigned int __user *)arg))
1262 return -EFAULT;
1263 ret = findintfep(ps->dev, ep);
1264 if (ret < 0)
1265 return ret;
1266 ret = checkintf(ps, ret);
1267 if (ret)
1268 return ret;
1269 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1270 if (ep & USB_DIR_IN)
1271 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1272 else
1273 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1274
1275 return usb_clear_halt(ps->dev, pipe);
1276}
1277
1278static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1279{
1280 struct usbdevfs_getdriver gd;
1281 struct usb_interface *intf;
1282 int ret;
1283
1284 if (copy_from_user(&gd, arg, sizeof(gd)))
1285 return -EFAULT;
1286 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1287 if (!intf || !intf->dev.driver)
1288 ret = -ENODATA;
1289 else {
1290 strlcpy(gd.driver, intf->dev.driver->name,
1291 sizeof(gd.driver));
1292 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1293 }
1294 return ret;
1295}
1296
1297static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1298{
1299 struct usbdevfs_connectinfo ci;
1300
1301 memset(&ci, 0, sizeof(ci));
1302 ci.devnum = ps->dev->devnum;
1303 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1304
1305 if (copy_to_user(arg, &ci, sizeof(ci)))
1306 return -EFAULT;
1307 return 0;
1308}
1309
1310static int proc_resetdevice(struct usb_dev_state *ps)
1311{
1312 struct usb_host_config *actconfig = ps->dev->actconfig;
1313 struct usb_interface *interface;
1314 int i, number;
1315
1316 /* Don't allow a device reset if the process has dropped the
1317 * privilege to do such things and any of the interfaces are
1318 * currently claimed.
1319 */
1320 if (ps->privileges_dropped && actconfig) {
1321 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1322 interface = actconfig->interface[i];
1323 number = interface->cur_altsetting->desc.bInterfaceNumber;
1324 if (usb_interface_claimed(interface) &&
1325 !test_bit(number, &ps->ifclaimed)) {
1326 dev_warn(&ps->dev->dev,
1327 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1328 number, interface->dev.driver->name, current->comm);
1329 return -EACCES;
1330 }
1331 }
1332 }
1333
1334 return usb_reset_device(ps->dev);
1335}
1336
1337static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1338{
1339 struct usbdevfs_setinterface setintf;
1340 int ret;
1341
1342 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1343 return -EFAULT;
1344 ret = checkintf(ps, setintf.interface);
1345 if (ret)
1346 return ret;
1347
1348 destroy_async_on_interface(ps, setintf.interface);
1349
1350 return usb_set_interface(ps->dev, setintf.interface,
1351 setintf.altsetting);
1352}
1353
1354static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1355{
1356 int u;
1357 int status = 0;
1358 struct usb_host_config *actconfig;
1359
1360 if (get_user(u, (int __user *)arg))
1361 return -EFAULT;
1362
1363 actconfig = ps->dev->actconfig;
1364
1365 /* Don't touch the device if any interfaces are claimed.
1366 * It could interfere with other drivers' operations, and if
1367 * an interface is claimed by usbfs it could easily deadlock.
1368 */
1369 if (actconfig) {
1370 int i;
1371
1372 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1373 if (usb_interface_claimed(actconfig->interface[i])) {
1374 dev_warn(&ps->dev->dev,
1375 "usbfs: interface %d claimed by %s "
1376 "while '%s' sets config #%d\n",
1377 actconfig->interface[i]
1378 ->cur_altsetting
1379 ->desc.bInterfaceNumber,
1380 actconfig->interface[i]
1381 ->dev.driver->name,
1382 current->comm, u);
1383 status = -EBUSY;
1384 break;
1385 }
1386 }
1387 }
1388
1389 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1390 * so avoid usb_set_configuration()'s kick to sysfs
1391 */
1392 if (status == 0) {
1393 if (actconfig && actconfig->desc.bConfigurationValue == u)
1394 status = usb_reset_configuration(ps->dev);
1395 else
1396 status = usb_set_configuration(ps->dev, u);
1397 }
1398
1399 return status;
1400}
1401
1402static struct usb_memory *
1403find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1404{
1405 struct usb_memory *usbm = NULL, *iter;
1406 unsigned long flags;
1407 unsigned long uurb_start = (unsigned long)uurb->buffer;
1408
1409 spin_lock_irqsave(&ps->lock, flags);
1410 list_for_each_entry(iter, &ps->memory_list, memlist) {
1411 if (uurb_start >= iter->vm_start &&
1412 uurb_start < iter->vm_start + iter->size) {
1413 if (uurb->buffer_length > iter->vm_start + iter->size -
1414 uurb_start) {
1415 usbm = ERR_PTR(-EINVAL);
1416 } else {
1417 usbm = iter;
1418 usbm->urb_use_count++;
1419 }
1420 break;
1421 }
1422 }
1423 spin_unlock_irqrestore(&ps->lock, flags);
1424 return usbm;
1425}
1426
1427static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1428 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1429 void __user *arg)
1430{
1431 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1432 struct usb_host_endpoint *ep;
1433 struct async *as = NULL;
1434 struct usb_ctrlrequest *dr = NULL;
1435 unsigned int u, totlen, isofrmlen;
1436 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1437 int number_of_packets = 0;
1438 unsigned int stream_id = 0;
1439 void *buf;
1440 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1441 USBDEVFS_URB_BULK_CONTINUATION |
1442 USBDEVFS_URB_NO_FSBR |
1443 USBDEVFS_URB_ZERO_PACKET |
1444 USBDEVFS_URB_NO_INTERRUPT;
1445 /* USBDEVFS_URB_ISO_ASAP is a special case */
1446 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1447 mask |= USBDEVFS_URB_ISO_ASAP;
1448
1449 if (uurb->flags & ~mask)
1450 return -EINVAL;
1451
1452 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1453 return -EINVAL;
1454 if (uurb->buffer_length > 0 && !uurb->buffer)
1455 return -EINVAL;
1456 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1457 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1458 ifnum = findintfep(ps->dev, uurb->endpoint);
1459 if (ifnum < 0)
1460 return ifnum;
1461 ret = checkintf(ps, ifnum);
1462 if (ret)
1463 return ret;
1464 }
1465 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1466 if (!ep)
1467 return -ENOENT;
1468 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1469
1470 u = 0;
1471 switch (uurb->type) {
1472 case USBDEVFS_URB_TYPE_CONTROL:
1473 if (!usb_endpoint_xfer_control(&ep->desc))
1474 return -EINVAL;
1475 /* min 8 byte setup packet */
1476 if (uurb->buffer_length < 8)
1477 return -EINVAL;
1478 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1479 if (!dr)
1480 return -ENOMEM;
1481 if (copy_from_user(dr, uurb->buffer, 8)) {
1482 ret = -EFAULT;
1483 goto error;
1484 }
1485 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1486 ret = -EINVAL;
1487 goto error;
1488 }
1489 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1490 le16_to_cpup(&dr->wIndex));
1491 if (ret)
1492 goto error;
1493 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1494 uurb->buffer += 8;
1495 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1496 is_in = 1;
1497 uurb->endpoint |= USB_DIR_IN;
1498 } else {
1499 is_in = 0;
1500 uurb->endpoint &= ~USB_DIR_IN;
1501 }
1502 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1503 "bRequest=%02x wValue=%04x "
1504 "wIndex=%04x wLength=%04x\n",
1505 dr->bRequestType, dr->bRequest,
1506 __le16_to_cpup(&dr->wValue),
1507 __le16_to_cpup(&dr->wIndex),
1508 __le16_to_cpup(&dr->wLength));
1509 u = sizeof(struct usb_ctrlrequest);
1510 break;
1511
1512 case USBDEVFS_URB_TYPE_BULK:
1513 switch (usb_endpoint_type(&ep->desc)) {
1514 case USB_ENDPOINT_XFER_CONTROL:
1515 case USB_ENDPOINT_XFER_ISOC:
1516 return -EINVAL;
1517 case USB_ENDPOINT_XFER_INT:
1518 /* allow single-shot interrupt transfers */
1519 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1520 goto interrupt_urb;
1521 }
1522 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1523 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1524 num_sgs = 0;
1525 if (ep->streams)
1526 stream_id = uurb->stream_id;
1527 break;
1528
1529 case USBDEVFS_URB_TYPE_INTERRUPT:
1530 if (!usb_endpoint_xfer_int(&ep->desc))
1531 return -EINVAL;
1532 interrupt_urb:
1533 break;
1534
1535 case USBDEVFS_URB_TYPE_ISO:
1536 /* arbitrary limit */
1537 if (uurb->number_of_packets < 1 ||
1538 uurb->number_of_packets > 128)
1539 return -EINVAL;
1540 if (!usb_endpoint_xfer_isoc(&ep->desc))
1541 return -EINVAL;
1542 number_of_packets = uurb->number_of_packets;
1543 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1544 number_of_packets;
1545 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1546 if (IS_ERR(isopkt)) {
1547 ret = PTR_ERR(isopkt);
1548 isopkt = NULL;
1549 goto error;
1550 }
1551 for (totlen = u = 0; u < number_of_packets; u++) {
1552 /*
1553 * arbitrary limit need for USB 3.0
1554 * bMaxBurst (0~15 allowed, 1~16 packets)
1555 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1556 * sizemax: 1024 * 16 * 3 = 49152
1557 */
1558 if (isopkt[u].length > 49152) {
1559 ret = -EINVAL;
1560 goto error;
1561 }
1562 totlen += isopkt[u].length;
1563 }
1564 u *= sizeof(struct usb_iso_packet_descriptor);
1565 uurb->buffer_length = totlen;
1566 break;
1567
1568 default:
1569 return -EINVAL;
1570 }
1571
1572 if (uurb->buffer_length > 0 &&
1573 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1574 uurb->buffer, uurb->buffer_length)) {
1575 ret = -EFAULT;
1576 goto error;
1577 }
1578 as = alloc_async(number_of_packets);
1579 if (!as) {
1580 ret = -ENOMEM;
1581 goto error;
1582 }
1583
1584 as->usbm = find_memory_area(ps, uurb);
1585 if (IS_ERR(as->usbm)) {
1586 ret = PTR_ERR(as->usbm);
1587 as->usbm = NULL;
1588 goto error;
1589 }
1590
1591 /* do not use SG buffers when memory mapped segments
1592 * are in use
1593 */
1594 if (as->usbm)
1595 num_sgs = 0;
1596
1597 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1598 num_sgs * sizeof(struct scatterlist);
1599 ret = usbfs_increase_memory_usage(u);
1600 if (ret)
1601 goto error;
1602 as->mem_usage = u;
1603
1604 if (num_sgs) {
1605 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1606 GFP_KERNEL);
1607 if (!as->urb->sg) {
1608 ret = -ENOMEM;
1609 goto error;
1610 }
1611 as->urb->num_sgs = num_sgs;
1612 sg_init_table(as->urb->sg, as->urb->num_sgs);
1613
1614 totlen = uurb->buffer_length;
1615 for (i = 0; i < as->urb->num_sgs; i++) {
1616 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1617 buf = kmalloc(u, GFP_KERNEL);
1618 if (!buf) {
1619 ret = -ENOMEM;
1620 goto error;
1621 }
1622 sg_set_buf(&as->urb->sg[i], buf, u);
1623
1624 if (!is_in) {
1625 if (copy_from_user(buf, uurb->buffer, u)) {
1626 ret = -EFAULT;
1627 goto error;
1628 }
1629 uurb->buffer += u;
1630 }
1631 totlen -= u;
1632 }
1633 } else if (uurb->buffer_length > 0) {
1634 if (as->usbm) {
1635 unsigned long uurb_start = (unsigned long)uurb->buffer;
1636
1637 as->urb->transfer_buffer = as->usbm->mem +
1638 (uurb_start - as->usbm->vm_start);
1639 } else {
1640 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1641 GFP_KERNEL);
1642 if (!as->urb->transfer_buffer) {
1643 ret = -ENOMEM;
1644 goto error;
1645 }
1646 if (!is_in) {
1647 if (copy_from_user(as->urb->transfer_buffer,
1648 uurb->buffer,
1649 uurb->buffer_length)) {
1650 ret = -EFAULT;
1651 goto error;
1652 }
1653 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1654 /*
1655 * Isochronous input data may end up being
1656 * discontiguous if some of the packets are
1657 * short. Clear the buffer so that the gaps
1658 * don't leak kernel data to userspace.
1659 */
1660 memset(as->urb->transfer_buffer, 0,
1661 uurb->buffer_length);
1662 }
1663 }
1664 }
1665 as->urb->dev = ps->dev;
1666 as->urb->pipe = (uurb->type << 30) |
1667 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1668 (uurb->endpoint & USB_DIR_IN);
1669
1670 /* This tedious sequence is necessary because the URB_* flags
1671 * are internal to the kernel and subject to change, whereas
1672 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1673 */
1674 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1675 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1676 u |= URB_ISO_ASAP;
1677 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1678 u |= URB_SHORT_NOT_OK;
1679 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1680 u |= URB_ZERO_PACKET;
1681 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1682 u |= URB_NO_INTERRUPT;
1683 as->urb->transfer_flags = u;
1684
1685 as->urb->transfer_buffer_length = uurb->buffer_length;
1686 as->urb->setup_packet = (unsigned char *)dr;
1687 dr = NULL;
1688 as->urb->start_frame = uurb->start_frame;
1689 as->urb->number_of_packets = number_of_packets;
1690 as->urb->stream_id = stream_id;
1691
1692 if (ep->desc.bInterval) {
1693 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1694 ps->dev->speed == USB_SPEED_HIGH ||
1695 ps->dev->speed >= USB_SPEED_SUPER)
1696 as->urb->interval = 1 <<
1697 min(15, ep->desc.bInterval - 1);
1698 else
1699 as->urb->interval = ep->desc.bInterval;
1700 }
1701
1702 as->urb->context = as;
1703 as->urb->complete = async_completed;
1704 for (totlen = u = 0; u < number_of_packets; u++) {
1705 as->urb->iso_frame_desc[u].offset = totlen;
1706 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1707 totlen += isopkt[u].length;
1708 }
1709 kfree(isopkt);
1710 isopkt = NULL;
1711 as->ps = ps;
1712 as->userurb = arg;
1713 if (as->usbm) {
1714 unsigned long uurb_start = (unsigned long)uurb->buffer;
1715
1716 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1717 as->urb->transfer_dma = as->usbm->dma_handle +
1718 (uurb_start - as->usbm->vm_start);
1719 } else if (is_in && uurb->buffer_length > 0)
1720 as->userbuffer = uurb->buffer;
1721 as->signr = uurb->signr;
1722 as->ifnum = ifnum;
1723 as->pid = get_pid(task_pid(current));
1724 as->cred = get_current_cred();
1725 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1726 as->urb->transfer_buffer_length, 0, SUBMIT,
1727 NULL, 0);
1728 if (!is_in)
1729 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1730
1731 async_newpending(as);
1732
1733 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1734 spin_lock_irq(&ps->lock);
1735
1736 /* Not exactly the endpoint address; the direction bit is
1737 * shifted to the 0x10 position so that the value will be
1738 * between 0 and 31.
1739 */
1740 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1741 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1742 >> 3);
1743
1744 /* If this bulk URB is the start of a new transfer, re-enable
1745 * the endpoint. Otherwise mark it as a continuation URB.
1746 */
1747 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1748 as->bulk_status = AS_CONTINUATION;
1749 else
1750 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1751
1752 /* Don't accept continuation URBs if the endpoint is
1753 * disabled because of an earlier error.
1754 */
1755 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1756 ret = -EREMOTEIO;
1757 else
1758 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1759 spin_unlock_irq(&ps->lock);
1760 } else {
1761 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1762 }
1763
1764 if (ret) {
1765 dev_printk(KERN_DEBUG, &ps->dev->dev,
1766 "usbfs: usb_submit_urb returned %d\n", ret);
1767 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1768 0, ret, COMPLETE, NULL, 0);
1769 async_removepending(as);
1770 goto error;
1771 }
1772 return 0;
1773
1774 error:
1775 if (as && as->usbm)
1776 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1777 kfree(isopkt);
1778 kfree(dr);
1779 if (as)
1780 free_async(as);
1781 return ret;
1782}
1783
1784static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1785{
1786 struct usbdevfs_urb uurb;
1787
1788 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1789 return -EFAULT;
1790
1791 return proc_do_submiturb(ps, &uurb,
1792 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1793 arg);
1794}
1795
1796static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1797{
1798 struct urb *urb;
1799 struct async *as;
1800 unsigned long flags;
1801
1802 spin_lock_irqsave(&ps->lock, flags);
1803 as = async_getpending(ps, arg);
1804 if (!as) {
1805 spin_unlock_irqrestore(&ps->lock, flags);
1806 return -EINVAL;
1807 }
1808
1809 urb = as->urb;
1810 usb_get_urb(urb);
1811 spin_unlock_irqrestore(&ps->lock, flags);
1812
1813 usb_kill_urb(urb);
1814 usb_put_urb(urb);
1815
1816 return 0;
1817}
1818
1819static void compute_isochronous_actual_length(struct urb *urb)
1820{
1821 unsigned int i;
1822
1823 if (urb->number_of_packets > 0) {
1824 urb->actual_length = 0;
1825 for (i = 0; i < urb->number_of_packets; i++)
1826 urb->actual_length +=
1827 urb->iso_frame_desc[i].actual_length;
1828 }
1829}
1830
1831static int processcompl(struct async *as, void __user * __user *arg)
1832{
1833 struct urb *urb = as->urb;
1834 struct usbdevfs_urb __user *userurb = as->userurb;
1835 void __user *addr = as->userurb;
1836 unsigned int i;
1837
1838 compute_isochronous_actual_length(urb);
1839 if (as->userbuffer && urb->actual_length) {
1840 if (copy_urb_data_to_user(as->userbuffer, urb))
1841 goto err_out;
1842 }
1843 if (put_user(as->status, &userurb->status))
1844 goto err_out;
1845 if (put_user(urb->actual_length, &userurb->actual_length))
1846 goto err_out;
1847 if (put_user(urb->error_count, &userurb->error_count))
1848 goto err_out;
1849
1850 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1851 for (i = 0; i < urb->number_of_packets; i++) {
1852 if (put_user(urb->iso_frame_desc[i].actual_length,
1853 &userurb->iso_frame_desc[i].actual_length))
1854 goto err_out;
1855 if (put_user(urb->iso_frame_desc[i].status,
1856 &userurb->iso_frame_desc[i].status))
1857 goto err_out;
1858 }
1859 }
1860
1861 if (put_user(addr, (void __user * __user *)arg))
1862 return -EFAULT;
1863 return 0;
1864
1865err_out:
1866 return -EFAULT;
1867}
1868
1869static struct async *reap_as(struct usb_dev_state *ps)
1870{
1871 DECLARE_WAITQUEUE(wait, current);
1872 struct async *as = NULL;
1873 struct usb_device *dev = ps->dev;
1874
1875 add_wait_queue(&ps->wait, &wait);
1876 for (;;) {
1877 __set_current_state(TASK_INTERRUPTIBLE);
1878 as = async_getcompleted(ps);
1879 if (as || !connected(ps))
1880 break;
1881 if (signal_pending(current))
1882 break;
1883 usb_unlock_device(dev);
1884 schedule();
1885 usb_lock_device(dev);
1886 }
1887 remove_wait_queue(&ps->wait, &wait);
1888 set_current_state(TASK_RUNNING);
1889 return as;
1890}
1891
1892static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1893{
1894 struct async *as = reap_as(ps);
1895
1896 if (as) {
1897 int retval;
1898
1899 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1900 retval = processcompl(as, (void __user * __user *)arg);
1901 free_async(as);
1902 return retval;
1903 }
1904 if (signal_pending(current))
1905 return -EINTR;
1906 return -ENODEV;
1907}
1908
1909static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1910{
1911 int retval;
1912 struct async *as;
1913
1914 as = async_getcompleted(ps);
1915 if (as) {
1916 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1917 retval = processcompl(as, (void __user * __user *)arg);
1918 free_async(as);
1919 } else {
1920 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1921 }
1922 return retval;
1923}
1924
1925#ifdef CONFIG_COMPAT
1926static int proc_control_compat(struct usb_dev_state *ps,
1927 struct usbdevfs_ctrltransfer32 __user *p32)
1928{
1929 struct usbdevfs_ctrltransfer __user *p;
1930 __u32 udata;
1931 p = compat_alloc_user_space(sizeof(*p));
1932 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1933 get_user(udata, &p32->data) ||
1934 put_user(compat_ptr(udata), &p->data))
1935 return -EFAULT;
1936 return proc_control(ps, p);
1937}
1938
1939static int proc_bulk_compat(struct usb_dev_state *ps,
1940 struct usbdevfs_bulktransfer32 __user *p32)
1941{
1942 struct usbdevfs_bulktransfer __user *p;
1943 compat_uint_t n;
1944 compat_caddr_t addr;
1945
1946 p = compat_alloc_user_space(sizeof(*p));
1947
1948 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1949 get_user(n, &p32->len) || put_user(n, &p->len) ||
1950 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1951 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1952 return -EFAULT;
1953
1954 return proc_bulk(ps, p);
1955}
1956static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1957{
1958 struct usbdevfs_disconnectsignal32 ds;
1959
1960 if (copy_from_user(&ds, arg, sizeof(ds)))
1961 return -EFAULT;
1962 ps->discsignr = ds.signr;
1963 ps->disccontext = compat_ptr(ds.context);
1964 return 0;
1965}
1966
1967static int get_urb32(struct usbdevfs_urb *kurb,
1968 struct usbdevfs_urb32 __user *uurb)
1969{
1970 struct usbdevfs_urb32 urb32;
1971 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1972 return -EFAULT;
1973 kurb->type = urb32.type;
1974 kurb->endpoint = urb32.endpoint;
1975 kurb->status = urb32.status;
1976 kurb->flags = urb32.flags;
1977 kurb->buffer = compat_ptr(urb32.buffer);
1978 kurb->buffer_length = urb32.buffer_length;
1979 kurb->actual_length = urb32.actual_length;
1980 kurb->start_frame = urb32.start_frame;
1981 kurb->number_of_packets = urb32.number_of_packets;
1982 kurb->error_count = urb32.error_count;
1983 kurb->signr = urb32.signr;
1984 kurb->usercontext = compat_ptr(urb32.usercontext);
1985 return 0;
1986}
1987
1988static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1989{
1990 struct usbdevfs_urb uurb;
1991
1992 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1993 return -EFAULT;
1994
1995 return proc_do_submiturb(ps, &uurb,
1996 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1997 arg);
1998}
1999
2000static int processcompl_compat(struct async *as, void __user * __user *arg)
2001{
2002 struct urb *urb = as->urb;
2003 struct usbdevfs_urb32 __user *userurb = as->userurb;
2004 void __user *addr = as->userurb;
2005 unsigned int i;
2006
2007 compute_isochronous_actual_length(urb);
2008 if (as->userbuffer && urb->actual_length) {
2009 if (copy_urb_data_to_user(as->userbuffer, urb))
2010 return -EFAULT;
2011 }
2012 if (put_user(as->status, &userurb->status))
2013 return -EFAULT;
2014 if (put_user(urb->actual_length, &userurb->actual_length))
2015 return -EFAULT;
2016 if (put_user(urb->error_count, &userurb->error_count))
2017 return -EFAULT;
2018
2019 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2020 for (i = 0; i < urb->number_of_packets; i++) {
2021 if (put_user(urb->iso_frame_desc[i].actual_length,
2022 &userurb->iso_frame_desc[i].actual_length))
2023 return -EFAULT;
2024 if (put_user(urb->iso_frame_desc[i].status,
2025 &userurb->iso_frame_desc[i].status))
2026 return -EFAULT;
2027 }
2028 }
2029
2030 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2031 return -EFAULT;
2032 return 0;
2033}
2034
2035static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2036{
2037 struct async *as = reap_as(ps);
2038
2039 if (as) {
2040 int retval;
2041
2042 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2043 retval = processcompl_compat(as, (void __user * __user *)arg);
2044 free_async(as);
2045 return retval;
2046 }
2047 if (signal_pending(current))
2048 return -EINTR;
2049 return -ENODEV;
2050}
2051
2052static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2053{
2054 int retval;
2055 struct async *as;
2056
2057 as = async_getcompleted(ps);
2058 if (as) {
2059 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2060 retval = processcompl_compat(as, (void __user * __user *)arg);
2061 free_async(as);
2062 } else {
2063 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2064 }
2065 return retval;
2066}
2067
2068
2069#endif
2070
2071static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2072{
2073 struct usbdevfs_disconnectsignal ds;
2074
2075 if (copy_from_user(&ds, arg, sizeof(ds)))
2076 return -EFAULT;
2077 ps->discsignr = ds.signr;
2078 ps->disccontext = ds.context;
2079 return 0;
2080}
2081
2082static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2083{
2084 unsigned int ifnum;
2085
2086 if (get_user(ifnum, (unsigned int __user *)arg))
2087 return -EFAULT;
2088 return claimintf(ps, ifnum);
2089}
2090
2091static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2092{
2093 unsigned int ifnum;
2094 int ret;
2095
2096 if (get_user(ifnum, (unsigned int __user *)arg))
2097 return -EFAULT;
2098 ret = releaseintf(ps, ifnum);
2099 if (ret < 0)
2100 return ret;
2101 destroy_async_on_interface(ps, ifnum);
2102 return 0;
2103}
2104
2105static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2106{
2107 int size;
2108 void *buf = NULL;
2109 int retval = 0;
2110 struct usb_interface *intf = NULL;
2111 struct usb_driver *driver = NULL;
2112
2113 if (ps->privileges_dropped)
2114 return -EACCES;
2115
2116 /* alloc buffer */
2117 size = _IOC_SIZE(ctl->ioctl_code);
2118 if (size > 0) {
2119 buf = kmalloc(size, GFP_KERNEL);
2120 if (buf == NULL)
2121 return -ENOMEM;
2122 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2123 if (copy_from_user(buf, ctl->data, size)) {
2124 kfree(buf);
2125 return -EFAULT;
2126 }
2127 } else {
2128 memset(buf, 0, size);
2129 }
2130 }
2131
2132 if (!connected(ps)) {
2133 kfree(buf);
2134 return -ENODEV;
2135 }
2136
2137 if (ps->dev->state != USB_STATE_CONFIGURED)
2138 retval = -EHOSTUNREACH;
2139 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2140 retval = -EINVAL;
2141 else switch (ctl->ioctl_code) {
2142
2143 /* disconnect kernel driver from interface */
2144 case USBDEVFS_DISCONNECT:
2145 if (intf->dev.driver) {
2146 driver = to_usb_driver(intf->dev.driver);
2147 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2148 usb_driver_release_interface(driver, intf);
2149 } else
2150 retval = -ENODATA;
2151 break;
2152
2153 /* let kernel drivers try to (re)bind to the interface */
2154 case USBDEVFS_CONNECT:
2155 if (!intf->dev.driver)
2156 retval = device_attach(&intf->dev);
2157 else
2158 retval = -EBUSY;
2159 break;
2160
2161 /* talk directly to the interface's driver */
2162 default:
2163 if (intf->dev.driver)
2164 driver = to_usb_driver(intf->dev.driver);
2165 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2166 retval = -ENOTTY;
2167 } else {
2168 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2169 if (retval == -ENOIOCTLCMD)
2170 retval = -ENOTTY;
2171 }
2172 }
2173
2174 /* cleanup and return */
2175 if (retval >= 0
2176 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2177 && size > 0
2178 && copy_to_user(ctl->data, buf, size) != 0)
2179 retval = -EFAULT;
2180
2181 kfree(buf);
2182 return retval;
2183}
2184
2185static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2186{
2187 struct usbdevfs_ioctl ctrl;
2188
2189 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2190 return -EFAULT;
2191 return proc_ioctl(ps, &ctrl);
2192}
2193
2194#ifdef CONFIG_COMPAT
2195static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2196{
2197 struct usbdevfs_ioctl32 ioc32;
2198 struct usbdevfs_ioctl ctrl;
2199
2200 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2201 return -EFAULT;
2202 ctrl.ifno = ioc32.ifno;
2203 ctrl.ioctl_code = ioc32.ioctl_code;
2204 ctrl.data = compat_ptr(ioc32.data);
2205 return proc_ioctl(ps, &ctrl);
2206}
2207#endif
2208
2209static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2210{
2211 unsigned portnum;
2212 int rc;
2213
2214 if (get_user(portnum, (unsigned __user *) arg))
2215 return -EFAULT;
2216 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2217 if (rc == 0)
2218 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2219 portnum, task_pid_nr(current), current->comm);
2220 return rc;
2221}
2222
2223static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2224{
2225 unsigned portnum;
2226
2227 if (get_user(portnum, (unsigned __user *) arg))
2228 return -EFAULT;
2229 return usb_hub_release_port(ps->dev, portnum, ps);
2230}
2231
2232static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2233{
2234 __u32 caps;
2235
2236 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2237 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2238 USBDEVFS_CAP_DROP_PRIVILEGES;
2239 if (!ps->dev->bus->no_stop_on_short)
2240 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2241 if (ps->dev->bus->sg_tablesize)
2242 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2243
2244 if (put_user(caps, (__u32 __user *)arg))
2245 return -EFAULT;
2246
2247 return 0;
2248}
2249
2250static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2251{
2252 struct usbdevfs_disconnect_claim dc;
2253 struct usb_interface *intf;
2254
2255 if (copy_from_user(&dc, arg, sizeof(dc)))
2256 return -EFAULT;
2257
2258 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2259 if (!intf)
2260 return -EINVAL;
2261
2262 if (intf->dev.driver) {
2263 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2264
2265 if (ps->privileges_dropped)
2266 return -EACCES;
2267
2268 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2269 strncmp(dc.driver, intf->dev.driver->name,
2270 sizeof(dc.driver)) != 0)
2271 return -EBUSY;
2272
2273 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2274 strncmp(dc.driver, intf->dev.driver->name,
2275 sizeof(dc.driver)) == 0)
2276 return -EBUSY;
2277
2278 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2279 usb_driver_release_interface(driver, intf);
2280 }
2281
2282 return claimintf(ps, dc.interface);
2283}
2284
2285static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2286{
2287 unsigned num_streams, num_eps;
2288 struct usb_host_endpoint **eps;
2289 struct usb_interface *intf;
2290 int r;
2291
2292 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2293 &eps, &intf);
2294 if (r)
2295 return r;
2296
2297 destroy_async_on_interface(ps,
2298 intf->altsetting[0].desc.bInterfaceNumber);
2299
2300 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2301 kfree(eps);
2302 return r;
2303}
2304
2305static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2306{
2307 unsigned num_eps;
2308 struct usb_host_endpoint **eps;
2309 struct usb_interface *intf;
2310 int r;
2311
2312 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2313 if (r)
2314 return r;
2315
2316 destroy_async_on_interface(ps,
2317 intf->altsetting[0].desc.bInterfaceNumber);
2318
2319 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2320 kfree(eps);
2321 return r;
2322}
2323
2324static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2325{
2326 u32 data;
2327
2328 if (copy_from_user(&data, arg, sizeof(data)))
2329 return -EFAULT;
2330
2331 /* This is a one way operation. Once privileges are
2332 * dropped, you cannot regain them. You may however reissue
2333 * this ioctl to shrink the allowed interfaces mask.
2334 */
2335 ps->interface_allowed_mask &= data;
2336 ps->privileges_dropped = true;
2337
2338 return 0;
2339}
2340
2341/*
2342 * NOTE: All requests here that have interface numbers as parameters
2343 * are assuming that somehow the configuration has been prevented from
2344 * changing. But there's no mechanism to ensure that...
2345 */
2346static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2347 void __user *p)
2348{
2349 struct usb_dev_state *ps = file->private_data;
2350 struct inode *inode = file_inode(file);
2351 struct usb_device *dev = ps->dev;
2352 int ret = -ENOTTY;
2353
2354 if (!(file->f_mode & FMODE_WRITE))
2355 return -EPERM;
2356
2357 usb_lock_device(dev);
2358
2359 /* Reap operations are allowed even after disconnection */
2360 switch (cmd) {
2361 case USBDEVFS_REAPURB:
2362 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2363 ret = proc_reapurb(ps, p);
2364 goto done;
2365
2366 case USBDEVFS_REAPURBNDELAY:
2367 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2368 ret = proc_reapurbnonblock(ps, p);
2369 goto done;
2370
2371#ifdef CONFIG_COMPAT
2372 case USBDEVFS_REAPURB32:
2373 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2374 ret = proc_reapurb_compat(ps, p);
2375 goto done;
2376
2377 case USBDEVFS_REAPURBNDELAY32:
2378 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2379 ret = proc_reapurbnonblock_compat(ps, p);
2380 goto done;
2381#endif
2382 }
2383
2384 if (!connected(ps)) {
2385 usb_unlock_device(dev);
2386 return -ENODEV;
2387 }
2388
2389 switch (cmd) {
2390 case USBDEVFS_CONTROL:
2391 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2392 ret = proc_control(ps, p);
2393 if (ret >= 0)
2394 inode->i_mtime = current_time(inode);
2395 break;
2396
2397 case USBDEVFS_BULK:
2398 snoop(&dev->dev, "%s: BULK\n", __func__);
2399 ret = proc_bulk(ps, p);
2400 if (ret >= 0)
2401 inode->i_mtime = current_time(inode);
2402 break;
2403
2404 case USBDEVFS_RESETEP:
2405 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2406 ret = proc_resetep(ps, p);
2407 if (ret >= 0)
2408 inode->i_mtime = current_time(inode);
2409 break;
2410
2411 case USBDEVFS_RESET:
2412 snoop(&dev->dev, "%s: RESET\n", __func__);
2413 ret = proc_resetdevice(ps);
2414 break;
2415
2416 case USBDEVFS_CLEAR_HALT:
2417 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2418 ret = proc_clearhalt(ps, p);
2419 if (ret >= 0)
2420 inode->i_mtime = current_time(inode);
2421 break;
2422
2423 case USBDEVFS_GETDRIVER:
2424 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2425 ret = proc_getdriver(ps, p);
2426 break;
2427
2428 case USBDEVFS_CONNECTINFO:
2429 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2430 ret = proc_connectinfo(ps, p);
2431 break;
2432
2433 case USBDEVFS_SETINTERFACE:
2434 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2435 ret = proc_setintf(ps, p);
2436 break;
2437
2438 case USBDEVFS_SETCONFIGURATION:
2439 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2440 ret = proc_setconfig(ps, p);
2441 break;
2442
2443 case USBDEVFS_SUBMITURB:
2444 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2445 ret = proc_submiturb(ps, p);
2446 if (ret >= 0)
2447 inode->i_mtime = current_time(inode);
2448 break;
2449
2450#ifdef CONFIG_COMPAT
2451 case USBDEVFS_CONTROL32:
2452 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2453 ret = proc_control_compat(ps, p);
2454 if (ret >= 0)
2455 inode->i_mtime = current_time(inode);
2456 break;
2457
2458 case USBDEVFS_BULK32:
2459 snoop(&dev->dev, "%s: BULK32\n", __func__);
2460 ret = proc_bulk_compat(ps, p);
2461 if (ret >= 0)
2462 inode->i_mtime = current_time(inode);
2463 break;
2464
2465 case USBDEVFS_DISCSIGNAL32:
2466 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2467 ret = proc_disconnectsignal_compat(ps, p);
2468 break;
2469
2470 case USBDEVFS_SUBMITURB32:
2471 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2472 ret = proc_submiturb_compat(ps, p);
2473 if (ret >= 0)
2474 inode->i_mtime = current_time(inode);
2475 break;
2476
2477 case USBDEVFS_IOCTL32:
2478 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2479 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2480 break;
2481#endif
2482
2483 case USBDEVFS_DISCARDURB:
2484 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2485 ret = proc_unlinkurb(ps, p);
2486 break;
2487
2488 case USBDEVFS_DISCSIGNAL:
2489 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2490 ret = proc_disconnectsignal(ps, p);
2491 break;
2492
2493 case USBDEVFS_CLAIMINTERFACE:
2494 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2495 ret = proc_claiminterface(ps, p);
2496 break;
2497
2498 case USBDEVFS_RELEASEINTERFACE:
2499 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2500 ret = proc_releaseinterface(ps, p);
2501 break;
2502
2503 case USBDEVFS_IOCTL:
2504 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2505 ret = proc_ioctl_default(ps, p);
2506 break;
2507
2508 case USBDEVFS_CLAIM_PORT:
2509 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2510 ret = proc_claim_port(ps, p);
2511 break;
2512
2513 case USBDEVFS_RELEASE_PORT:
2514 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2515 ret = proc_release_port(ps, p);
2516 break;
2517 case USBDEVFS_GET_CAPABILITIES:
2518 ret = proc_get_capabilities(ps, p);
2519 break;
2520 case USBDEVFS_DISCONNECT_CLAIM:
2521 ret = proc_disconnect_claim(ps, p);
2522 break;
2523 case USBDEVFS_ALLOC_STREAMS:
2524 ret = proc_alloc_streams(ps, p);
2525 break;
2526 case USBDEVFS_FREE_STREAMS:
2527 ret = proc_free_streams(ps, p);
2528 break;
2529 case USBDEVFS_DROP_PRIVILEGES:
2530 ret = proc_drop_privileges(ps, p);
2531 break;
2532 case USBDEVFS_GET_SPEED:
2533 ret = ps->dev->speed;
2534 break;
2535 }
2536
2537 done:
2538 usb_unlock_device(dev);
2539 if (ret >= 0)
2540 inode->i_atime = current_time(inode);
2541 return ret;
2542}
2543
2544static long usbdev_ioctl(struct file *file, unsigned int cmd,
2545 unsigned long arg)
2546{
2547 int ret;
2548
2549 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2550
2551 return ret;
2552}
2553
2554#ifdef CONFIG_COMPAT
2555static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2556 unsigned long arg)
2557{
2558 int ret;
2559
2560 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2561
2562 return ret;
2563}
2564#endif
2565
2566/* No kernel lock - fine */
2567static __poll_t usbdev_poll(struct file *file,
2568 struct poll_table_struct *wait)
2569{
2570 struct usb_dev_state *ps = file->private_data;
2571 __poll_t mask = 0;
2572
2573 poll_wait(file, &ps->wait, wait);
2574 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2575 mask |= EPOLLOUT | EPOLLWRNORM;
2576 if (!connected(ps))
2577 mask |= EPOLLHUP;
2578 if (list_empty(&ps->list))
2579 mask |= EPOLLERR;
2580 return mask;
2581}
2582
2583const struct file_operations usbdev_file_operations = {
2584 .owner = THIS_MODULE,
2585 .llseek = no_seek_end_llseek,
2586 .read = usbdev_read,
2587 .poll = usbdev_poll,
2588 .unlocked_ioctl = usbdev_ioctl,
2589#ifdef CONFIG_COMPAT
2590 .compat_ioctl = usbdev_compat_ioctl,
2591#endif
2592 .mmap = usbdev_mmap,
2593 .open = usbdev_open,
2594 .release = usbdev_release,
2595};
2596
2597static void usbdev_remove(struct usb_device *udev)
2598{
2599 struct usb_dev_state *ps;
2600 struct siginfo sinfo;
2601
2602 while (!list_empty(&udev->filelist)) {
2603 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2604 destroy_all_async(ps);
2605 wake_up_all(&ps->wait);
2606 list_del_init(&ps->list);
2607 if (ps->discsignr) {
2608 clear_siginfo(&sinfo);
2609 sinfo.si_signo = ps->discsignr;
2610 sinfo.si_errno = EPIPE;
2611 sinfo.si_code = SI_ASYNCIO;
2612 sinfo.si_addr = ps->disccontext;
2613 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2614 ps->disc_pid, ps->cred);
2615 }
2616 }
2617}
2618
2619static int usbdev_notify(struct notifier_block *self,
2620 unsigned long action, void *dev)
2621{
2622 switch (action) {
2623 case USB_DEVICE_ADD:
2624 break;
2625 case USB_DEVICE_REMOVE:
2626 usbdev_remove(dev);
2627 break;
2628 }
2629 return NOTIFY_OK;
2630}
2631
2632static struct notifier_block usbdev_nb = {
2633 .notifier_call = usbdev_notify,
2634};
2635
2636static struct cdev usb_device_cdev;
2637
2638int __init usb_devio_init(void)
2639{
2640 int retval;
2641
2642 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2643 "usb_device");
2644 if (retval) {
2645 printk(KERN_ERR "Unable to register minors for usb_device\n");
2646 goto out;
2647 }
2648 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2649 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2650 if (retval) {
2651 printk(KERN_ERR "Unable to get usb_device major %d\n",
2652 USB_DEVICE_MAJOR);
2653 goto error_cdev;
2654 }
2655 usb_register_notify(&usbdev_nb);
2656out:
2657 return retval;
2658
2659error_cdev:
2660 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2661 goto out;
2662}
2663
2664void usb_devio_cleanup(void)
2665{
2666 usb_unregister_notify(&usbdev_nb);
2667 cdev_del(&usb_device_cdev);
2668 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2669}