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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / drivers / usb / core / devio.c
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/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
55
56 #include "usb.h"
57
58 #define USB_MAXBUS 64
59 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
60 #define USB_SG_SIZE 16384 /* split-size for large txs */
61
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct usb_dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
68 struct file *file;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
74 struct pid *disc_pid;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
78 u32 secid;
79 u32 disabled_bulk_eps;
80 };
81
82 struct async {
83 struct list_head asynclist;
84 struct usb_dev_state *ps;
85 struct pid *pid;
86 const struct cred *cred;
87 unsigned int signr;
88 unsigned int ifnum;
89 void __user *userbuffer;
90 void __user *userurb;
91 struct urb *urb;
92 unsigned int mem_usage;
93 int status;
94 u32 secid;
95 u8 bulk_addr;
96 u8 bulk_status;
97 };
98
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102
103 #define snoop(dev, format, arg...) \
104 do { \
105 if (usbfs_snoop) \
106 dev_info(dev , format , ## arg); \
107 } while (0)
108
109 enum snoop_when {
110 SUBMIT, COMPLETE
111 };
112
113 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
114
115 /* Limit on the total amount of memory we can allocate for transfers */
116 static unsigned usbfs_memory_mb = 16;
117 module_param(usbfs_memory_mb, uint, 0644);
118 MODULE_PARM_DESC(usbfs_memory_mb,
119 "maximum MB allowed for usbfs buffers (0 = no limit)");
120
121 /* Hard limit, necessary to avoid arithmetic overflow */
122 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
123
124 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
125
126 /* Check whether it's okay to allocate more memory for a transfer */
127 static int usbfs_increase_memory_usage(unsigned amount)
128 {
129 unsigned lim;
130
131 /*
132 * Convert usbfs_memory_mb to bytes, avoiding overflows.
133 * 0 means use the hard limit (effectively unlimited).
134 */
135 lim = ACCESS_ONCE(usbfs_memory_mb);
136 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137 lim = USBFS_XFER_MAX;
138 else
139 lim <<= 20;
140
141 atomic_add(amount, &usbfs_memory_usage);
142 if (atomic_read(&usbfs_memory_usage) <= lim)
143 return 0;
144 atomic_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 /* Memory for a transfer is being deallocated */
149 static void usbfs_decrease_memory_usage(unsigned amount)
150 {
151 atomic_sub(amount, &usbfs_memory_usage);
152 }
153
154 static int connected(struct usb_dev_state *ps)
155 {
156 return (!list_empty(&ps->list) &&
157 ps->dev->state != USB_STATE_NOTATTACHED);
158 }
159
160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
161 {
162 loff_t ret;
163
164 mutex_lock(&file_inode(file)->i_mutex);
165
166 switch (orig) {
167 case 0:
168 file->f_pos = offset;
169 ret = file->f_pos;
170 break;
171 case 1:
172 file->f_pos += offset;
173 ret = file->f_pos;
174 break;
175 case 2:
176 default:
177 ret = -EINVAL;
178 }
179
180 mutex_unlock(&file_inode(file)->i_mutex);
181 return ret;
182 }
183
184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
185 loff_t *ppos)
186 {
187 struct usb_dev_state *ps = file->private_data;
188 struct usb_device *dev = ps->dev;
189 ssize_t ret = 0;
190 unsigned len;
191 loff_t pos;
192 int i;
193
194 pos = *ppos;
195 usb_lock_device(dev);
196 if (!connected(ps)) {
197 ret = -ENODEV;
198 goto err;
199 } else if (pos < 0) {
200 ret = -EINVAL;
201 goto err;
202 }
203
204 if (pos < sizeof(struct usb_device_descriptor)) {
205 /* 18 bytes - fits on the stack */
206 struct usb_device_descriptor temp_desc;
207
208 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209 le16_to_cpus(&temp_desc.bcdUSB);
210 le16_to_cpus(&temp_desc.idVendor);
211 le16_to_cpus(&temp_desc.idProduct);
212 le16_to_cpus(&temp_desc.bcdDevice);
213
214 len = sizeof(struct usb_device_descriptor) - pos;
215 if (len > nbytes)
216 len = nbytes;
217 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
218 ret = -EFAULT;
219 goto err;
220 }
221
222 *ppos += len;
223 buf += len;
224 nbytes -= len;
225 ret += len;
226 }
227
228 pos = sizeof(struct usb_device_descriptor);
229 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230 struct usb_config_descriptor *config =
231 (struct usb_config_descriptor *)dev->rawdescriptors[i];
232 unsigned int length = le16_to_cpu(config->wTotalLength);
233
234 if (*ppos < pos + length) {
235
236 /* The descriptor may claim to be longer than it
237 * really is. Here is the actual allocated length. */
238 unsigned alloclen =
239 le16_to_cpu(dev->config[i].desc.wTotalLength);
240
241 len = length - (*ppos - pos);
242 if (len > nbytes)
243 len = nbytes;
244
245 /* Simply don't write (skip over) unallocated parts */
246 if (alloclen > (*ppos - pos)) {
247 alloclen -= (*ppos - pos);
248 if (copy_to_user(buf,
249 dev->rawdescriptors[i] + (*ppos - pos),
250 min(len, alloclen))) {
251 ret = -EFAULT;
252 goto err;
253 }
254 }
255
256 *ppos += len;
257 buf += len;
258 nbytes -= len;
259 ret += len;
260 }
261
262 pos += length;
263 }
264
265 err:
266 usb_unlock_device(dev);
267 return ret;
268 }
269
270 /*
271 * async list handling
272 */
273
274 static struct async *alloc_async(unsigned int numisoframes)
275 {
276 struct async *as;
277
278 as = kzalloc(sizeof(struct async), GFP_KERNEL);
279 if (!as)
280 return NULL;
281 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
282 if (!as->urb) {
283 kfree(as);
284 return NULL;
285 }
286 return as;
287 }
288
289 static void free_async(struct async *as)
290 {
291 int i;
292
293 put_pid(as->pid);
294 if (as->cred)
295 put_cred(as->cred);
296 for (i = 0; i < as->urb->num_sgs; i++) {
297 if (sg_page(&as->urb->sg[i]))
298 kfree(sg_virt(&as->urb->sg[i]));
299 }
300 kfree(as->urb->sg);
301 kfree(as->urb->transfer_buffer);
302 kfree(as->urb->setup_packet);
303 usb_free_urb(as->urb);
304 usbfs_decrease_memory_usage(as->mem_usage);
305 kfree(as);
306 }
307
308 static void async_newpending(struct async *as)
309 {
310 struct usb_dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_add_tail(&as->asynclist, &ps->async_pending);
315 spin_unlock_irqrestore(&ps->lock, flags);
316 }
317
318 static void async_removepending(struct async *as)
319 {
320 struct usb_dev_state *ps = as->ps;
321 unsigned long flags;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 list_del_init(&as->asynclist);
325 spin_unlock_irqrestore(&ps->lock, flags);
326 }
327
328 static struct async *async_getcompleted(struct usb_dev_state *ps)
329 {
330 unsigned long flags;
331 struct async *as = NULL;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 if (!list_empty(&ps->async_completed)) {
335 as = list_entry(ps->async_completed.next, struct async,
336 asynclist);
337 list_del_init(&as->asynclist);
338 }
339 spin_unlock_irqrestore(&ps->lock, flags);
340 return as;
341 }
342
343 static struct async *async_getpending(struct usb_dev_state *ps,
344 void __user *userurb)
345 {
346 struct async *as;
347
348 list_for_each_entry(as, &ps->async_pending, asynclist)
349 if (as->userurb == userurb) {
350 list_del_init(&as->asynclist);
351 return as;
352 }
353
354 return NULL;
355 }
356
357 static void snoop_urb(struct usb_device *udev,
358 void __user *userurb, int pipe, unsigned length,
359 int timeout_or_status, enum snoop_when when,
360 unsigned char *data, unsigned data_len)
361 {
362 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363 static const char *dirs[] = {"out", "in"};
364 int ep;
365 const char *t, *d;
366
367 if (!usbfs_snoop)
368 return;
369
370 ep = usb_pipeendpoint(pipe);
371 t = types[usb_pipetype(pipe)];
372 d = dirs[!!usb_pipein(pipe)];
373
374 if (userurb) { /* Async */
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
377 "length %u\n",
378 userurb, ep, t, d, length);
379 else
380 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381 "actual_length %u status %d\n",
382 userurb, ep, t, d, length,
383 timeout_or_status);
384 } else {
385 if (when == SUBMIT)
386 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
387 "timeout %d\n",
388 ep, t, d, length, timeout_or_status);
389 else
390 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
391 "status %d\n",
392 ep, t, d, length, timeout_or_status);
393 }
394
395 if (data && data_len > 0) {
396 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
397 data, data_len, 1);
398 }
399 }
400
401 static void snoop_urb_data(struct urb *urb, unsigned len)
402 {
403 int i, size;
404
405 if (!usbfs_snoop)
406 return;
407
408 if (urb->num_sgs == 0) {
409 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410 urb->transfer_buffer, len, 1);
411 return;
412 }
413
414 for (i = 0; i < urb->num_sgs && len; i++) {
415 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417 sg_virt(&urb->sg[i]), size, 1);
418 len -= size;
419 }
420 }
421
422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
423 {
424 unsigned i, len, size;
425
426 if (urb->number_of_packets > 0) /* Isochronous */
427 len = urb->transfer_buffer_length;
428 else /* Non-Isoc */
429 len = urb->actual_length;
430
431 if (urb->num_sgs == 0) {
432 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
433 return -EFAULT;
434 return 0;
435 }
436
437 for (i = 0; i < urb->num_sgs && len; i++) {
438 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
440 return -EFAULT;
441 userbuffer += size;
442 len -= size;
443 }
444
445 return 0;
446 }
447
448 #define AS_CONTINUATION 1
449 #define AS_UNLINK 2
450
451 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
452 __releases(ps->lock)
453 __acquires(ps->lock)
454 {
455 struct urb *urb;
456 struct async *as;
457
458 /* Mark all the pending URBs that match bulk_addr, up to but not
459 * including the first one without AS_CONTINUATION. If such an
460 * URB is encountered then a new transfer has already started so
461 * the endpoint doesn't need to be disabled; otherwise it does.
462 */
463 list_for_each_entry(as, &ps->async_pending, asynclist) {
464 if (as->bulk_addr == bulk_addr) {
465 if (as->bulk_status != AS_CONTINUATION)
466 goto rescan;
467 as->bulk_status = AS_UNLINK;
468 as->bulk_addr = 0;
469 }
470 }
471 ps->disabled_bulk_eps |= (1 << bulk_addr);
472
473 /* Now carefully unlink all the marked pending URBs */
474 rescan:
475 list_for_each_entry(as, &ps->async_pending, asynclist) {
476 if (as->bulk_status == AS_UNLINK) {
477 as->bulk_status = 0; /* Only once */
478 urb = as->urb;
479 usb_get_urb(urb);
480 spin_unlock(&ps->lock); /* Allow completions */
481 usb_unlink_urb(urb);
482 usb_put_urb(urb);
483 spin_lock(&ps->lock);
484 goto rescan;
485 }
486 }
487 }
488
489 static void async_completed(struct urb *urb)
490 {
491 struct async *as = urb->context;
492 struct usb_dev_state *ps = as->ps;
493 struct siginfo sinfo;
494 struct pid *pid = NULL;
495 u32 secid = 0;
496 const struct cred *cred = NULL;
497 int signr;
498
499 spin_lock(&ps->lock);
500 list_move_tail(&as->asynclist, &ps->async_completed);
501 as->status = urb->status;
502 signr = as->signr;
503 if (signr) {
504 memset(&sinfo, 0, sizeof(sinfo));
505 sinfo.si_signo = as->signr;
506 sinfo.si_errno = as->status;
507 sinfo.si_code = SI_ASYNCIO;
508 sinfo.si_addr = as->userurb;
509 pid = get_pid(as->pid);
510 cred = get_cred(as->cred);
511 secid = as->secid;
512 }
513 snoop(&urb->dev->dev, "urb complete\n");
514 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
515 as->status, COMPLETE, NULL, 0);
516 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
517 snoop_urb_data(urb, urb->actual_length);
518
519 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
520 as->status != -ENOENT)
521 cancel_bulk_urbs(ps, as->bulk_addr);
522 spin_unlock(&ps->lock);
523
524 if (signr) {
525 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
526 put_pid(pid);
527 put_cred(cred);
528 }
529
530 wake_up(&ps->wait);
531 }
532
533 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
534 {
535 struct urb *urb;
536 struct async *as;
537 unsigned long flags;
538
539 spin_lock_irqsave(&ps->lock, flags);
540 while (!list_empty(list)) {
541 as = list_entry(list->next, struct async, asynclist);
542 list_del_init(&as->asynclist);
543 urb = as->urb;
544 usb_get_urb(urb);
545
546 /* drop the spinlock so the completion handler can run */
547 spin_unlock_irqrestore(&ps->lock, flags);
548 usb_kill_urb(urb);
549 usb_put_urb(urb);
550 spin_lock_irqsave(&ps->lock, flags);
551 }
552 spin_unlock_irqrestore(&ps->lock, flags);
553 }
554
555 static void destroy_async_on_interface(struct usb_dev_state *ps,
556 unsigned int ifnum)
557 {
558 struct list_head *p, *q, hitlist;
559 unsigned long flags;
560
561 INIT_LIST_HEAD(&hitlist);
562 spin_lock_irqsave(&ps->lock, flags);
563 list_for_each_safe(p, q, &ps->async_pending)
564 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
565 list_move_tail(p, &hitlist);
566 spin_unlock_irqrestore(&ps->lock, flags);
567 destroy_async(ps, &hitlist);
568 }
569
570 static void destroy_all_async(struct usb_dev_state *ps)
571 {
572 destroy_async(ps, &ps->async_pending);
573 }
574
575 /*
576 * interface claims are made only at the request of user level code,
577 * which can also release them (explicitly or by closing files).
578 * they're also undone when devices disconnect.
579 */
580
581 static int driver_probe(struct usb_interface *intf,
582 const struct usb_device_id *id)
583 {
584 return -ENODEV;
585 }
586
587 static void driver_disconnect(struct usb_interface *intf)
588 {
589 struct usb_dev_state *ps = usb_get_intfdata(intf);
590 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
591
592 if (!ps)
593 return;
594
595 /* NOTE: this relies on usbcore having canceled and completed
596 * all pending I/O requests; 2.6 does that.
597 */
598
599 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
600 clear_bit(ifnum, &ps->ifclaimed);
601 else
602 dev_warn(&intf->dev, "interface number %u out of range\n",
603 ifnum);
604
605 usb_set_intfdata(intf, NULL);
606
607 /* force async requests to complete */
608 destroy_async_on_interface(ps, ifnum);
609 }
610
611 /* The following routines are merely placeholders. There is no way
612 * to inform a user task about suspend or resumes.
613 */
614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
615 {
616 return 0;
617 }
618
619 static int driver_resume(struct usb_interface *intf)
620 {
621 return 0;
622 }
623
624 struct usb_driver usbfs_driver = {
625 .name = "usbfs",
626 .probe = driver_probe,
627 .disconnect = driver_disconnect,
628 .suspend = driver_suspend,
629 .resume = driver_resume,
630 };
631
632 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
633 {
634 struct usb_device *dev = ps->dev;
635 struct usb_interface *intf;
636 int err;
637
638 if (ifnum >= 8*sizeof(ps->ifclaimed))
639 return -EINVAL;
640 /* already claimed */
641 if (test_bit(ifnum, &ps->ifclaimed))
642 return 0;
643
644 intf = usb_ifnum_to_if(dev, ifnum);
645 if (!intf)
646 err = -ENOENT;
647 else
648 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
649 if (err == 0)
650 set_bit(ifnum, &ps->ifclaimed);
651 return err;
652 }
653
654 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
655 {
656 struct usb_device *dev;
657 struct usb_interface *intf;
658 int err;
659
660 err = -EINVAL;
661 if (ifnum >= 8*sizeof(ps->ifclaimed))
662 return err;
663 dev = ps->dev;
664 intf = usb_ifnum_to_if(dev, ifnum);
665 if (!intf)
666 err = -ENOENT;
667 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
668 usb_driver_release_interface(&usbfs_driver, intf);
669 err = 0;
670 }
671 return err;
672 }
673
674 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
675 {
676 if (ps->dev->state != USB_STATE_CONFIGURED)
677 return -EHOSTUNREACH;
678 if (ifnum >= 8*sizeof(ps->ifclaimed))
679 return -EINVAL;
680 if (test_bit(ifnum, &ps->ifclaimed))
681 return 0;
682 /* if not yet claimed, claim it for the driver */
683 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
684 "interface %u before use\n", task_pid_nr(current),
685 current->comm, ifnum);
686 return claimintf(ps, ifnum);
687 }
688
689 static int findintfep(struct usb_device *dev, unsigned int ep)
690 {
691 unsigned int i, j, e;
692 struct usb_interface *intf;
693 struct usb_host_interface *alts;
694 struct usb_endpoint_descriptor *endpt;
695
696 if (ep & ~(USB_DIR_IN|0xf))
697 return -EINVAL;
698 if (!dev->actconfig)
699 return -ESRCH;
700 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
701 intf = dev->actconfig->interface[i];
702 for (j = 0; j < intf->num_altsetting; j++) {
703 alts = &intf->altsetting[j];
704 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
705 endpt = &alts->endpoint[e].desc;
706 if (endpt->bEndpointAddress == ep)
707 return alts->desc.bInterfaceNumber;
708 }
709 }
710 }
711 return -ENOENT;
712 }
713
714 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
715 unsigned int request, unsigned int index)
716 {
717 int ret = 0;
718 struct usb_host_interface *alt_setting;
719
720 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
721 && ps->dev->state != USB_STATE_ADDRESS
722 && ps->dev->state != USB_STATE_CONFIGURED)
723 return -EHOSTUNREACH;
724 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
725 return 0;
726
727 /*
728 * check for the special corner case 'get_device_id' in the printer
729 * class specification, which we always want to allow as it is used
730 * to query things like ink level, etc.
731 */
732 if (requesttype == 0xa1 && request == 0) {
733 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
734 index >> 8, index & 0xff);
735 if (alt_setting
736 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
737 return 0;
738 }
739
740 index &= 0xff;
741 switch (requesttype & USB_RECIP_MASK) {
742 case USB_RECIP_ENDPOINT:
743 if ((index & ~USB_DIR_IN) == 0)
744 return 0;
745 ret = findintfep(ps->dev, index);
746 if (ret < 0) {
747 /*
748 * Some not fully compliant Win apps seem to get
749 * index wrong and have the endpoint number here
750 * rather than the endpoint address (with the
751 * correct direction). Win does let this through,
752 * so we'll not reject it here but leave it to
753 * the device to not break KVM. But we warn.
754 */
755 ret = findintfep(ps->dev, index ^ 0x80);
756 if (ret >= 0)
757 dev_info(&ps->dev->dev,
758 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
759 __func__, task_pid_nr(current),
760 current->comm, index, index ^ 0x80);
761 }
762 if (ret >= 0)
763 ret = checkintf(ps, ret);
764 break;
765
766 case USB_RECIP_INTERFACE:
767 ret = checkintf(ps, index);
768 break;
769 }
770 return ret;
771 }
772
773 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
774 unsigned char ep)
775 {
776 if (ep & USB_ENDPOINT_DIR_MASK)
777 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
778 else
779 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
780 }
781
782 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
783 struct usbdevfs_streams __user *streams,
784 unsigned int *num_streams_ret,
785 unsigned int *num_eps_ret,
786 struct usb_host_endpoint ***eps_ret,
787 struct usb_interface **intf_ret)
788 {
789 unsigned int i, num_streams, num_eps;
790 struct usb_host_endpoint **eps;
791 struct usb_interface *intf = NULL;
792 unsigned char ep;
793 int ifnum, ret;
794
795 if (get_user(num_streams, &streams->num_streams) ||
796 get_user(num_eps, &streams->num_eps))
797 return -EFAULT;
798
799 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
800 return -EINVAL;
801
802 /* The XHCI controller allows max 2 ^ 16 streams */
803 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
804 return -EINVAL;
805
806 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
807 if (!eps)
808 return -ENOMEM;
809
810 for (i = 0; i < num_eps; i++) {
811 if (get_user(ep, &streams->eps[i])) {
812 ret = -EFAULT;
813 goto error;
814 }
815 eps[i] = ep_to_host_endpoint(ps->dev, ep);
816 if (!eps[i]) {
817 ret = -EINVAL;
818 goto error;
819 }
820
821 /* usb_alloc/free_streams operate on an usb_interface */
822 ifnum = findintfep(ps->dev, ep);
823 if (ifnum < 0) {
824 ret = ifnum;
825 goto error;
826 }
827
828 if (i == 0) {
829 ret = checkintf(ps, ifnum);
830 if (ret < 0)
831 goto error;
832 intf = usb_ifnum_to_if(ps->dev, ifnum);
833 } else {
834 /* Verify all eps belong to the same interface */
835 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
836 ret = -EINVAL;
837 goto error;
838 }
839 }
840 }
841
842 if (num_streams_ret)
843 *num_streams_ret = num_streams;
844 *num_eps_ret = num_eps;
845 *eps_ret = eps;
846 *intf_ret = intf;
847
848 return 0;
849
850 error:
851 kfree(eps);
852 return ret;
853 }
854
855 static int match_devt(struct device *dev, void *data)
856 {
857 return dev->devt == (dev_t) (unsigned long) data;
858 }
859
860 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
861 {
862 struct device *dev;
863
864 dev = bus_find_device(&usb_bus_type, NULL,
865 (void *) (unsigned long) devt, match_devt);
866 if (!dev)
867 return NULL;
868 return container_of(dev, struct usb_device, dev);
869 }
870
871 /*
872 * file operations
873 */
874 static int usbdev_open(struct inode *inode, struct file *file)
875 {
876 struct usb_device *dev = NULL;
877 struct usb_dev_state *ps;
878 int ret;
879
880 ret = -ENOMEM;
881 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
882 if (!ps)
883 goto out_free_ps;
884
885 ret = -ENODEV;
886
887 /* Protect against simultaneous removal or release */
888 mutex_lock(&usbfs_mutex);
889
890 /* usbdev device-node */
891 if (imajor(inode) == USB_DEVICE_MAJOR)
892 dev = usbdev_lookup_by_devt(inode->i_rdev);
893
894 mutex_unlock(&usbfs_mutex);
895
896 if (!dev)
897 goto out_free_ps;
898
899 usb_lock_device(dev);
900 if (dev->state == USB_STATE_NOTATTACHED)
901 goto out_unlock_device;
902
903 ret = usb_autoresume_device(dev);
904 if (ret)
905 goto out_unlock_device;
906
907 ps->dev = dev;
908 ps->file = file;
909 spin_lock_init(&ps->lock);
910 INIT_LIST_HEAD(&ps->list);
911 INIT_LIST_HEAD(&ps->async_pending);
912 INIT_LIST_HEAD(&ps->async_completed);
913 init_waitqueue_head(&ps->wait);
914 ps->discsignr = 0;
915 ps->disc_pid = get_pid(task_pid(current));
916 ps->cred = get_current_cred();
917 ps->disccontext = NULL;
918 ps->ifclaimed = 0;
919 security_task_getsecid(current, &ps->secid);
920 smp_wmb();
921 list_add_tail(&ps->list, &dev->filelist);
922 file->private_data = ps;
923 usb_unlock_device(dev);
924 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
925 current->comm);
926 return ret;
927
928 out_unlock_device:
929 usb_unlock_device(dev);
930 usb_put_dev(dev);
931 out_free_ps:
932 kfree(ps);
933 return ret;
934 }
935
936 static int usbdev_release(struct inode *inode, struct file *file)
937 {
938 struct usb_dev_state *ps = file->private_data;
939 struct usb_device *dev = ps->dev;
940 unsigned int ifnum;
941 struct async *as;
942
943 usb_lock_device(dev);
944 usb_hub_release_all_ports(dev, ps);
945
946 list_del_init(&ps->list);
947
948 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
949 ifnum++) {
950 if (test_bit(ifnum, &ps->ifclaimed))
951 releaseintf(ps, ifnum);
952 }
953 destroy_all_async(ps);
954 usb_autosuspend_device(dev);
955 usb_unlock_device(dev);
956 usb_put_dev(dev);
957 put_pid(ps->disc_pid);
958 put_cred(ps->cred);
959
960 as = async_getcompleted(ps);
961 while (as) {
962 free_async(as);
963 as = async_getcompleted(ps);
964 }
965 kfree(ps);
966 return 0;
967 }
968
969 static int proc_control(struct usb_dev_state *ps, void __user *arg)
970 {
971 struct usb_device *dev = ps->dev;
972 struct usbdevfs_ctrltransfer ctrl;
973 unsigned int tmo;
974 unsigned char *tbuf;
975 unsigned wLength;
976 int i, pipe, ret;
977
978 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
979 return -EFAULT;
980 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
981 ctrl.wIndex);
982 if (ret)
983 return ret;
984 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
985 if (wLength > PAGE_SIZE)
986 return -EINVAL;
987 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
988 sizeof(struct usb_ctrlrequest));
989 if (ret)
990 return ret;
991 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
992 if (!tbuf) {
993 ret = -ENOMEM;
994 goto done;
995 }
996 tmo = ctrl.timeout;
997 snoop(&dev->dev, "control urb: bRequestType=%02x "
998 "bRequest=%02x wValue=%04x "
999 "wIndex=%04x wLength=%04x\n",
1000 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1001 ctrl.wIndex, ctrl.wLength);
1002 if (ctrl.bRequestType & 0x80) {
1003 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1004 ctrl.wLength)) {
1005 ret = -EINVAL;
1006 goto done;
1007 }
1008 pipe = usb_rcvctrlpipe(dev, 0);
1009 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1010
1011 usb_unlock_device(dev);
1012 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1013 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1014 tbuf, ctrl.wLength, tmo);
1015 usb_lock_device(dev);
1016 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1017 tbuf, max(i, 0));
1018 if ((i > 0) && ctrl.wLength) {
1019 if (copy_to_user(ctrl.data, tbuf, i)) {
1020 ret = -EFAULT;
1021 goto done;
1022 }
1023 }
1024 } else {
1025 if (ctrl.wLength) {
1026 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1027 ret = -EFAULT;
1028 goto done;
1029 }
1030 }
1031 pipe = usb_sndctrlpipe(dev, 0);
1032 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1033 tbuf, ctrl.wLength);
1034
1035 usb_unlock_device(dev);
1036 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1037 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1038 tbuf, ctrl.wLength, tmo);
1039 usb_lock_device(dev);
1040 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1041 }
1042 if (i < 0 && i != -EPIPE) {
1043 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1044 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1045 current->comm, ctrl.bRequestType, ctrl.bRequest,
1046 ctrl.wLength, i);
1047 }
1048 ret = i;
1049 done:
1050 free_page((unsigned long) tbuf);
1051 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1052 sizeof(struct usb_ctrlrequest));
1053 return ret;
1054 }
1055
1056 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1057 {
1058 struct usb_device *dev = ps->dev;
1059 struct usbdevfs_bulktransfer bulk;
1060 unsigned int tmo, len1, pipe;
1061 int len2;
1062 unsigned char *tbuf;
1063 int i, ret;
1064
1065 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1066 return -EFAULT;
1067 ret = findintfep(ps->dev, bulk.ep);
1068 if (ret < 0)
1069 return ret;
1070 ret = checkintf(ps, ret);
1071 if (ret)
1072 return ret;
1073 if (bulk.ep & USB_DIR_IN)
1074 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1075 else
1076 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1077 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1078 return -EINVAL;
1079 len1 = bulk.len;
1080 if (len1 >= USBFS_XFER_MAX)
1081 return -EINVAL;
1082 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1083 if (ret)
1084 return ret;
1085 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1086 ret = -ENOMEM;
1087 goto done;
1088 }
1089 tmo = bulk.timeout;
1090 if (bulk.ep & 0x80) {
1091 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1092 ret = -EINVAL;
1093 goto done;
1094 }
1095 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1096
1097 usb_unlock_device(dev);
1098 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1099 usb_lock_device(dev);
1100 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1101
1102 if (!i && len2) {
1103 if (copy_to_user(bulk.data, tbuf, len2)) {
1104 ret = -EFAULT;
1105 goto done;
1106 }
1107 }
1108 } else {
1109 if (len1) {
1110 if (copy_from_user(tbuf, bulk.data, len1)) {
1111 ret = -EFAULT;
1112 goto done;
1113 }
1114 }
1115 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1116
1117 usb_unlock_device(dev);
1118 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1119 usb_lock_device(dev);
1120 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1121 }
1122 ret = (i < 0 ? i : len2);
1123 done:
1124 kfree(tbuf);
1125 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1126 return ret;
1127 }
1128
1129 static void check_reset_of_active_ep(struct usb_device *udev,
1130 unsigned int epnum, char *ioctl_name)
1131 {
1132 struct usb_host_endpoint **eps;
1133 struct usb_host_endpoint *ep;
1134
1135 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1136 ep = eps[epnum & 0x0f];
1137 if (ep && !list_empty(&ep->urb_list))
1138 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1139 task_pid_nr(current), current->comm,
1140 ioctl_name, epnum);
1141 }
1142
1143 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1144 {
1145 unsigned int ep;
1146 int ret;
1147
1148 if (get_user(ep, (unsigned int __user *)arg))
1149 return -EFAULT;
1150 ret = findintfep(ps->dev, ep);
1151 if (ret < 0)
1152 return ret;
1153 ret = checkintf(ps, ret);
1154 if (ret)
1155 return ret;
1156 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1157 usb_reset_endpoint(ps->dev, ep);
1158 return 0;
1159 }
1160
1161 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1162 {
1163 unsigned int ep;
1164 int pipe;
1165 int ret;
1166
1167 if (get_user(ep, (unsigned int __user *)arg))
1168 return -EFAULT;
1169 ret = findintfep(ps->dev, ep);
1170 if (ret < 0)
1171 return ret;
1172 ret = checkintf(ps, ret);
1173 if (ret)
1174 return ret;
1175 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1176 if (ep & USB_DIR_IN)
1177 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1178 else
1179 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1180
1181 return usb_clear_halt(ps->dev, pipe);
1182 }
1183
1184 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1185 {
1186 struct usbdevfs_getdriver gd;
1187 struct usb_interface *intf;
1188 int ret;
1189
1190 if (copy_from_user(&gd, arg, sizeof(gd)))
1191 return -EFAULT;
1192 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1193 if (!intf || !intf->dev.driver)
1194 ret = -ENODATA;
1195 else {
1196 strlcpy(gd.driver, intf->dev.driver->name,
1197 sizeof(gd.driver));
1198 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1199 }
1200 return ret;
1201 }
1202
1203 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1204 {
1205 struct usbdevfs_connectinfo ci = {
1206 .devnum = ps->dev->devnum,
1207 .slow = ps->dev->speed == USB_SPEED_LOW
1208 };
1209
1210 if (copy_to_user(arg, &ci, sizeof(ci)))
1211 return -EFAULT;
1212 return 0;
1213 }
1214
1215 static int proc_resetdevice(struct usb_dev_state *ps)
1216 {
1217 return usb_reset_device(ps->dev);
1218 }
1219
1220 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1221 {
1222 struct usbdevfs_setinterface setintf;
1223 int ret;
1224
1225 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1226 return -EFAULT;
1227 if ((ret = checkintf(ps, setintf.interface)))
1228 return ret;
1229
1230 destroy_async_on_interface(ps, setintf.interface);
1231
1232 return usb_set_interface(ps->dev, setintf.interface,
1233 setintf.altsetting);
1234 }
1235
1236 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1237 {
1238 int u;
1239 int status = 0;
1240 struct usb_host_config *actconfig;
1241
1242 if (get_user(u, (int __user *)arg))
1243 return -EFAULT;
1244
1245 actconfig = ps->dev->actconfig;
1246
1247 /* Don't touch the device if any interfaces are claimed.
1248 * It could interfere with other drivers' operations, and if
1249 * an interface is claimed by usbfs it could easily deadlock.
1250 */
1251 if (actconfig) {
1252 int i;
1253
1254 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1255 if (usb_interface_claimed(actconfig->interface[i])) {
1256 dev_warn(&ps->dev->dev,
1257 "usbfs: interface %d claimed by %s "
1258 "while '%s' sets config #%d\n",
1259 actconfig->interface[i]
1260 ->cur_altsetting
1261 ->desc.bInterfaceNumber,
1262 actconfig->interface[i]
1263 ->dev.driver->name,
1264 current->comm, u);
1265 status = -EBUSY;
1266 break;
1267 }
1268 }
1269 }
1270
1271 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1272 * so avoid usb_set_configuration()'s kick to sysfs
1273 */
1274 if (status == 0) {
1275 if (actconfig && actconfig->desc.bConfigurationValue == u)
1276 status = usb_reset_configuration(ps->dev);
1277 else
1278 status = usb_set_configuration(ps->dev, u);
1279 }
1280
1281 return status;
1282 }
1283
1284 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1285 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1286 void __user *arg)
1287 {
1288 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1289 struct usb_host_endpoint *ep;
1290 struct async *as = NULL;
1291 struct usb_ctrlrequest *dr = NULL;
1292 unsigned int u, totlen, isofrmlen;
1293 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1294 int number_of_packets = 0;
1295 unsigned int stream_id = 0;
1296 void *buf;
1297
1298 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1299 USBDEVFS_URB_SHORT_NOT_OK |
1300 USBDEVFS_URB_BULK_CONTINUATION |
1301 USBDEVFS_URB_NO_FSBR |
1302 USBDEVFS_URB_ZERO_PACKET |
1303 USBDEVFS_URB_NO_INTERRUPT))
1304 return -EINVAL;
1305 if (uurb->buffer_length > 0 && !uurb->buffer)
1306 return -EINVAL;
1307 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1308 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1309 ifnum = findintfep(ps->dev, uurb->endpoint);
1310 if (ifnum < 0)
1311 return ifnum;
1312 ret = checkintf(ps, ifnum);
1313 if (ret)
1314 return ret;
1315 }
1316 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1317 if (!ep)
1318 return -ENOENT;
1319 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1320
1321 u = 0;
1322 switch(uurb->type) {
1323 case USBDEVFS_URB_TYPE_CONTROL:
1324 if (!usb_endpoint_xfer_control(&ep->desc))
1325 return -EINVAL;
1326 /* min 8 byte setup packet */
1327 if (uurb->buffer_length < 8)
1328 return -EINVAL;
1329 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1330 if (!dr)
1331 return -ENOMEM;
1332 if (copy_from_user(dr, uurb->buffer, 8)) {
1333 ret = -EFAULT;
1334 goto error;
1335 }
1336 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1337 ret = -EINVAL;
1338 goto error;
1339 }
1340 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1341 le16_to_cpup(&dr->wIndex));
1342 if (ret)
1343 goto error;
1344 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1345 uurb->buffer += 8;
1346 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1347 is_in = 1;
1348 uurb->endpoint |= USB_DIR_IN;
1349 } else {
1350 is_in = 0;
1351 uurb->endpoint &= ~USB_DIR_IN;
1352 }
1353 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1354 "bRequest=%02x wValue=%04x "
1355 "wIndex=%04x wLength=%04x\n",
1356 dr->bRequestType, dr->bRequest,
1357 __le16_to_cpup(&dr->wValue),
1358 __le16_to_cpup(&dr->wIndex),
1359 __le16_to_cpup(&dr->wLength));
1360 u = sizeof(struct usb_ctrlrequest);
1361 break;
1362
1363 case USBDEVFS_URB_TYPE_BULK:
1364 switch (usb_endpoint_type(&ep->desc)) {
1365 case USB_ENDPOINT_XFER_CONTROL:
1366 case USB_ENDPOINT_XFER_ISOC:
1367 return -EINVAL;
1368 case USB_ENDPOINT_XFER_INT:
1369 /* allow single-shot interrupt transfers */
1370 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1371 goto interrupt_urb;
1372 }
1373 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1374 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1375 num_sgs = 0;
1376 if (ep->streams)
1377 stream_id = uurb->stream_id;
1378 break;
1379
1380 case USBDEVFS_URB_TYPE_INTERRUPT:
1381 if (!usb_endpoint_xfer_int(&ep->desc))
1382 return -EINVAL;
1383 interrupt_urb:
1384 break;
1385
1386 case USBDEVFS_URB_TYPE_ISO:
1387 /* arbitrary limit */
1388 if (uurb->number_of_packets < 1 ||
1389 uurb->number_of_packets > 128)
1390 return -EINVAL;
1391 if (!usb_endpoint_xfer_isoc(&ep->desc))
1392 return -EINVAL;
1393 number_of_packets = uurb->number_of_packets;
1394 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1395 number_of_packets;
1396 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1397 return -ENOMEM;
1398 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1399 ret = -EFAULT;
1400 goto error;
1401 }
1402 for (totlen = u = 0; u < number_of_packets; u++) {
1403 /*
1404 * arbitrary limit need for USB 3.0
1405 * bMaxBurst (0~15 allowed, 1~16 packets)
1406 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1407 * sizemax: 1024 * 16 * 3 = 49152
1408 */
1409 if (isopkt[u].length > 49152) {
1410 ret = -EINVAL;
1411 goto error;
1412 }
1413 totlen += isopkt[u].length;
1414 }
1415 u *= sizeof(struct usb_iso_packet_descriptor);
1416 uurb->buffer_length = totlen;
1417 break;
1418
1419 default:
1420 return -EINVAL;
1421 }
1422
1423 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1424 ret = -EINVAL;
1425 goto error;
1426 }
1427 if (uurb->buffer_length > 0 &&
1428 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1429 uurb->buffer, uurb->buffer_length)) {
1430 ret = -EFAULT;
1431 goto error;
1432 }
1433 as = alloc_async(number_of_packets);
1434 if (!as) {
1435 ret = -ENOMEM;
1436 goto error;
1437 }
1438
1439 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1440 num_sgs * sizeof(struct scatterlist);
1441 ret = usbfs_increase_memory_usage(u);
1442 if (ret)
1443 goto error;
1444 as->mem_usage = u;
1445
1446 if (num_sgs) {
1447 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1448 GFP_KERNEL);
1449 if (!as->urb->sg) {
1450 ret = -ENOMEM;
1451 goto error;
1452 }
1453 as->urb->num_sgs = num_sgs;
1454 sg_init_table(as->urb->sg, as->urb->num_sgs);
1455
1456 totlen = uurb->buffer_length;
1457 for (i = 0; i < as->urb->num_sgs; i++) {
1458 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1459 buf = kmalloc(u, GFP_KERNEL);
1460 if (!buf) {
1461 ret = -ENOMEM;
1462 goto error;
1463 }
1464 sg_set_buf(&as->urb->sg[i], buf, u);
1465
1466 if (!is_in) {
1467 if (copy_from_user(buf, uurb->buffer, u)) {
1468 ret = -EFAULT;
1469 goto error;
1470 }
1471 uurb->buffer += u;
1472 }
1473 totlen -= u;
1474 }
1475 } else if (uurb->buffer_length > 0) {
1476 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1477 GFP_KERNEL);
1478 if (!as->urb->transfer_buffer) {
1479 ret = -ENOMEM;
1480 goto error;
1481 }
1482
1483 if (!is_in) {
1484 if (copy_from_user(as->urb->transfer_buffer,
1485 uurb->buffer,
1486 uurb->buffer_length)) {
1487 ret = -EFAULT;
1488 goto error;
1489 }
1490 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1491 /*
1492 * Isochronous input data may end up being
1493 * discontiguous if some of the packets are short.
1494 * Clear the buffer so that the gaps don't leak
1495 * kernel data to userspace.
1496 */
1497 memset(as->urb->transfer_buffer, 0,
1498 uurb->buffer_length);
1499 }
1500 }
1501 as->urb->dev = ps->dev;
1502 as->urb->pipe = (uurb->type << 30) |
1503 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1504 (uurb->endpoint & USB_DIR_IN);
1505
1506 /* This tedious sequence is necessary because the URB_* flags
1507 * are internal to the kernel and subject to change, whereas
1508 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1509 */
1510 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1511 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1512 u |= URB_ISO_ASAP;
1513 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1514 u |= URB_SHORT_NOT_OK;
1515 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1516 u |= URB_NO_FSBR;
1517 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1518 u |= URB_ZERO_PACKET;
1519 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1520 u |= URB_NO_INTERRUPT;
1521 as->urb->transfer_flags = u;
1522
1523 as->urb->transfer_buffer_length = uurb->buffer_length;
1524 as->urb->setup_packet = (unsigned char *)dr;
1525 dr = NULL;
1526 as->urb->start_frame = uurb->start_frame;
1527 as->urb->number_of_packets = number_of_packets;
1528 as->urb->stream_id = stream_id;
1529 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1530 ps->dev->speed == USB_SPEED_HIGH)
1531 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1532 else
1533 as->urb->interval = ep->desc.bInterval;
1534 as->urb->context = as;
1535 as->urb->complete = async_completed;
1536 for (totlen = u = 0; u < number_of_packets; u++) {
1537 as->urb->iso_frame_desc[u].offset = totlen;
1538 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1539 totlen += isopkt[u].length;
1540 }
1541 kfree(isopkt);
1542 isopkt = NULL;
1543 as->ps = ps;
1544 as->userurb = arg;
1545 if (is_in && uurb->buffer_length > 0)
1546 as->userbuffer = uurb->buffer;
1547 else
1548 as->userbuffer = NULL;
1549 as->signr = uurb->signr;
1550 as->ifnum = ifnum;
1551 as->pid = get_pid(task_pid(current));
1552 as->cred = get_current_cred();
1553 security_task_getsecid(current, &as->secid);
1554 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1555 as->urb->transfer_buffer_length, 0, SUBMIT,
1556 NULL, 0);
1557 if (!is_in)
1558 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1559
1560 async_newpending(as);
1561
1562 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1563 spin_lock_irq(&ps->lock);
1564
1565 /* Not exactly the endpoint address; the direction bit is
1566 * shifted to the 0x10 position so that the value will be
1567 * between 0 and 31.
1568 */
1569 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1570 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1571 >> 3);
1572
1573 /* If this bulk URB is the start of a new transfer, re-enable
1574 * the endpoint. Otherwise mark it as a continuation URB.
1575 */
1576 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1577 as->bulk_status = AS_CONTINUATION;
1578 else
1579 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1580
1581 /* Don't accept continuation URBs if the endpoint is
1582 * disabled because of an earlier error.
1583 */
1584 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1585 ret = -EREMOTEIO;
1586 else
1587 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1588 spin_unlock_irq(&ps->lock);
1589 } else {
1590 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1591 }
1592
1593 if (ret) {
1594 dev_printk(KERN_DEBUG, &ps->dev->dev,
1595 "usbfs: usb_submit_urb returned %d\n", ret);
1596 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1597 0, ret, COMPLETE, NULL, 0);
1598 async_removepending(as);
1599 goto error;
1600 }
1601 return 0;
1602
1603 error:
1604 kfree(isopkt);
1605 kfree(dr);
1606 if (as)
1607 free_async(as);
1608 return ret;
1609 }
1610
1611 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1612 {
1613 struct usbdevfs_urb uurb;
1614
1615 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1616 return -EFAULT;
1617
1618 return proc_do_submiturb(ps, &uurb,
1619 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1620 arg);
1621 }
1622
1623 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1624 {
1625 struct urb *urb;
1626 struct async *as;
1627 unsigned long flags;
1628
1629 spin_lock_irqsave(&ps->lock, flags);
1630 as = async_getpending(ps, arg);
1631 if (!as) {
1632 spin_unlock_irqrestore(&ps->lock, flags);
1633 return -EINVAL;
1634 }
1635
1636 urb = as->urb;
1637 usb_get_urb(urb);
1638 spin_unlock_irqrestore(&ps->lock, flags);
1639
1640 usb_kill_urb(urb);
1641 usb_put_urb(urb);
1642
1643 return 0;
1644 }
1645
1646 static int processcompl(struct async *as, void __user * __user *arg)
1647 {
1648 struct urb *urb = as->urb;
1649 struct usbdevfs_urb __user *userurb = as->userurb;
1650 void __user *addr = as->userurb;
1651 unsigned int i;
1652
1653 if (as->userbuffer && urb->actual_length) {
1654 if (copy_urb_data_to_user(as->userbuffer, urb))
1655 goto err_out;
1656 }
1657 if (put_user(as->status, &userurb->status))
1658 goto err_out;
1659 if (put_user(urb->actual_length, &userurb->actual_length))
1660 goto err_out;
1661 if (put_user(urb->error_count, &userurb->error_count))
1662 goto err_out;
1663
1664 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1665 for (i = 0; i < urb->number_of_packets; i++) {
1666 if (put_user(urb->iso_frame_desc[i].actual_length,
1667 &userurb->iso_frame_desc[i].actual_length))
1668 goto err_out;
1669 if (put_user(urb->iso_frame_desc[i].status,
1670 &userurb->iso_frame_desc[i].status))
1671 goto err_out;
1672 }
1673 }
1674
1675 if (put_user(addr, (void __user * __user *)arg))
1676 return -EFAULT;
1677 return 0;
1678
1679 err_out:
1680 return -EFAULT;
1681 }
1682
1683 static struct async *reap_as(struct usb_dev_state *ps)
1684 {
1685 DECLARE_WAITQUEUE(wait, current);
1686 struct async *as = NULL;
1687 struct usb_device *dev = ps->dev;
1688
1689 add_wait_queue(&ps->wait, &wait);
1690 for (;;) {
1691 __set_current_state(TASK_INTERRUPTIBLE);
1692 as = async_getcompleted(ps);
1693 if (as || !connected(ps))
1694 break;
1695 if (signal_pending(current))
1696 break;
1697 usb_unlock_device(dev);
1698 schedule();
1699 usb_lock_device(dev);
1700 }
1701 remove_wait_queue(&ps->wait, &wait);
1702 set_current_state(TASK_RUNNING);
1703 return as;
1704 }
1705
1706 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1707 {
1708 struct async *as = reap_as(ps);
1709 if (as) {
1710 int retval = processcompl(as, (void __user * __user *)arg);
1711 free_async(as);
1712 return retval;
1713 }
1714 if (signal_pending(current))
1715 return -EINTR;
1716 return -ENODEV;
1717 }
1718
1719 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1720 {
1721 int retval;
1722 struct async *as;
1723
1724 as = async_getcompleted(ps);
1725 if (as) {
1726 retval = processcompl(as, (void __user * __user *)arg);
1727 free_async(as);
1728 } else {
1729 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1730 }
1731 return retval;
1732 }
1733
1734 #ifdef CONFIG_COMPAT
1735 static int proc_control_compat(struct usb_dev_state *ps,
1736 struct usbdevfs_ctrltransfer32 __user *p32)
1737 {
1738 struct usbdevfs_ctrltransfer __user *p;
1739 __u32 udata;
1740 p = compat_alloc_user_space(sizeof(*p));
1741 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1742 get_user(udata, &p32->data) ||
1743 put_user(compat_ptr(udata), &p->data))
1744 return -EFAULT;
1745 return proc_control(ps, p);
1746 }
1747
1748 static int proc_bulk_compat(struct usb_dev_state *ps,
1749 struct usbdevfs_bulktransfer32 __user *p32)
1750 {
1751 struct usbdevfs_bulktransfer __user *p;
1752 compat_uint_t n;
1753 compat_caddr_t addr;
1754
1755 p = compat_alloc_user_space(sizeof(*p));
1756
1757 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1758 get_user(n, &p32->len) || put_user(n, &p->len) ||
1759 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1760 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1761 return -EFAULT;
1762
1763 return proc_bulk(ps, p);
1764 }
1765 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1766 {
1767 struct usbdevfs_disconnectsignal32 ds;
1768
1769 if (copy_from_user(&ds, arg, sizeof(ds)))
1770 return -EFAULT;
1771 ps->discsignr = ds.signr;
1772 ps->disccontext = compat_ptr(ds.context);
1773 return 0;
1774 }
1775
1776 static int get_urb32(struct usbdevfs_urb *kurb,
1777 struct usbdevfs_urb32 __user *uurb)
1778 {
1779 __u32 uptr;
1780 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1781 __get_user(kurb->type, &uurb->type) ||
1782 __get_user(kurb->endpoint, &uurb->endpoint) ||
1783 __get_user(kurb->status, &uurb->status) ||
1784 __get_user(kurb->flags, &uurb->flags) ||
1785 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1786 __get_user(kurb->actual_length, &uurb->actual_length) ||
1787 __get_user(kurb->start_frame, &uurb->start_frame) ||
1788 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1789 __get_user(kurb->error_count, &uurb->error_count) ||
1790 __get_user(kurb->signr, &uurb->signr))
1791 return -EFAULT;
1792
1793 if (__get_user(uptr, &uurb->buffer))
1794 return -EFAULT;
1795 kurb->buffer = compat_ptr(uptr);
1796 if (__get_user(uptr, &uurb->usercontext))
1797 return -EFAULT;
1798 kurb->usercontext = compat_ptr(uptr);
1799
1800 return 0;
1801 }
1802
1803 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1804 {
1805 struct usbdevfs_urb uurb;
1806
1807 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1808 return -EFAULT;
1809
1810 return proc_do_submiturb(ps, &uurb,
1811 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1812 arg);
1813 }
1814
1815 static int processcompl_compat(struct async *as, void __user * __user *arg)
1816 {
1817 struct urb *urb = as->urb;
1818 struct usbdevfs_urb32 __user *userurb = as->userurb;
1819 void __user *addr = as->userurb;
1820 unsigned int i;
1821
1822 if (as->userbuffer && urb->actual_length) {
1823 if (copy_urb_data_to_user(as->userbuffer, urb))
1824 return -EFAULT;
1825 }
1826 if (put_user(as->status, &userurb->status))
1827 return -EFAULT;
1828 if (put_user(urb->actual_length, &userurb->actual_length))
1829 return -EFAULT;
1830 if (put_user(urb->error_count, &userurb->error_count))
1831 return -EFAULT;
1832
1833 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1834 for (i = 0; i < urb->number_of_packets; i++) {
1835 if (put_user(urb->iso_frame_desc[i].actual_length,
1836 &userurb->iso_frame_desc[i].actual_length))
1837 return -EFAULT;
1838 if (put_user(urb->iso_frame_desc[i].status,
1839 &userurb->iso_frame_desc[i].status))
1840 return -EFAULT;
1841 }
1842 }
1843
1844 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1845 return -EFAULT;
1846 return 0;
1847 }
1848
1849 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1850 {
1851 struct async *as = reap_as(ps);
1852 if (as) {
1853 int retval = processcompl_compat(as, (void __user * __user *)arg);
1854 free_async(as);
1855 return retval;
1856 }
1857 if (signal_pending(current))
1858 return -EINTR;
1859 return -ENODEV;
1860 }
1861
1862 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1863 {
1864 int retval;
1865 struct async *as;
1866
1867 as = async_getcompleted(ps);
1868 if (as) {
1869 retval = processcompl_compat(as, (void __user * __user *)arg);
1870 free_async(as);
1871 } else {
1872 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1873 }
1874 return retval;
1875 }
1876
1877
1878 #endif
1879
1880 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1881 {
1882 struct usbdevfs_disconnectsignal ds;
1883
1884 if (copy_from_user(&ds, arg, sizeof(ds)))
1885 return -EFAULT;
1886 ps->discsignr = ds.signr;
1887 ps->disccontext = ds.context;
1888 return 0;
1889 }
1890
1891 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1892 {
1893 unsigned int ifnum;
1894
1895 if (get_user(ifnum, (unsigned int __user *)arg))
1896 return -EFAULT;
1897 return claimintf(ps, ifnum);
1898 }
1899
1900 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1901 {
1902 unsigned int ifnum;
1903 int ret;
1904
1905 if (get_user(ifnum, (unsigned int __user *)arg))
1906 return -EFAULT;
1907 if ((ret = releaseintf(ps, ifnum)) < 0)
1908 return ret;
1909 destroy_async_on_interface (ps, ifnum);
1910 return 0;
1911 }
1912
1913 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1914 {
1915 int size;
1916 void *buf = NULL;
1917 int retval = 0;
1918 struct usb_interface *intf = NULL;
1919 struct usb_driver *driver = NULL;
1920
1921 /* alloc buffer */
1922 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1923 buf = kmalloc(size, GFP_KERNEL);
1924 if (buf == NULL)
1925 return -ENOMEM;
1926 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1927 if (copy_from_user(buf, ctl->data, size)) {
1928 kfree(buf);
1929 return -EFAULT;
1930 }
1931 } else {
1932 memset(buf, 0, size);
1933 }
1934 }
1935
1936 if (!connected(ps)) {
1937 kfree(buf);
1938 return -ENODEV;
1939 }
1940
1941 if (ps->dev->state != USB_STATE_CONFIGURED)
1942 retval = -EHOSTUNREACH;
1943 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1944 retval = -EINVAL;
1945 else switch (ctl->ioctl_code) {
1946
1947 /* disconnect kernel driver from interface */
1948 case USBDEVFS_DISCONNECT:
1949 if (intf->dev.driver) {
1950 driver = to_usb_driver(intf->dev.driver);
1951 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1952 usb_driver_release_interface(driver, intf);
1953 } else
1954 retval = -ENODATA;
1955 break;
1956
1957 /* let kernel drivers try to (re)bind to the interface */
1958 case USBDEVFS_CONNECT:
1959 if (!intf->dev.driver)
1960 retval = device_attach(&intf->dev);
1961 else
1962 retval = -EBUSY;
1963 break;
1964
1965 /* talk directly to the interface's driver */
1966 default:
1967 if (intf->dev.driver)
1968 driver = to_usb_driver(intf->dev.driver);
1969 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1970 retval = -ENOTTY;
1971 } else {
1972 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1973 if (retval == -ENOIOCTLCMD)
1974 retval = -ENOTTY;
1975 }
1976 }
1977
1978 /* cleanup and return */
1979 if (retval >= 0
1980 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1981 && size > 0
1982 && copy_to_user(ctl->data, buf, size) != 0)
1983 retval = -EFAULT;
1984
1985 kfree(buf);
1986 return retval;
1987 }
1988
1989 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1990 {
1991 struct usbdevfs_ioctl ctrl;
1992
1993 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1994 return -EFAULT;
1995 return proc_ioctl(ps, &ctrl);
1996 }
1997
1998 #ifdef CONFIG_COMPAT
1999 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2000 {
2001 struct usbdevfs_ioctl32 __user *uioc;
2002 struct usbdevfs_ioctl ctrl;
2003 u32 udata;
2004
2005 uioc = compat_ptr((long)arg);
2006 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2007 __get_user(ctrl.ifno, &uioc->ifno) ||
2008 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2009 __get_user(udata, &uioc->data))
2010 return -EFAULT;
2011 ctrl.data = compat_ptr(udata);
2012
2013 return proc_ioctl(ps, &ctrl);
2014 }
2015 #endif
2016
2017 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2018 {
2019 unsigned portnum;
2020 int rc;
2021
2022 if (get_user(portnum, (unsigned __user *) arg))
2023 return -EFAULT;
2024 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2025 if (rc == 0)
2026 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2027 portnum, task_pid_nr(current), current->comm);
2028 return rc;
2029 }
2030
2031 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2032 {
2033 unsigned portnum;
2034
2035 if (get_user(portnum, (unsigned __user *) arg))
2036 return -EFAULT;
2037 return usb_hub_release_port(ps->dev, portnum, ps);
2038 }
2039
2040 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2041 {
2042 __u32 caps;
2043
2044 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2045 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2046 if (!ps->dev->bus->no_stop_on_short)
2047 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2048 if (ps->dev->bus->sg_tablesize)
2049 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2050
2051 if (put_user(caps, (__u32 __user *)arg))
2052 return -EFAULT;
2053
2054 return 0;
2055 }
2056
2057 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2058 {
2059 struct usbdevfs_disconnect_claim dc;
2060 struct usb_interface *intf;
2061
2062 if (copy_from_user(&dc, arg, sizeof(dc)))
2063 return -EFAULT;
2064
2065 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2066 if (!intf)
2067 return -EINVAL;
2068
2069 if (intf->dev.driver) {
2070 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2071
2072 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2073 strncmp(dc.driver, intf->dev.driver->name,
2074 sizeof(dc.driver)) != 0)
2075 return -EBUSY;
2076
2077 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2078 strncmp(dc.driver, intf->dev.driver->name,
2079 sizeof(dc.driver)) == 0)
2080 return -EBUSY;
2081
2082 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2083 usb_driver_release_interface(driver, intf);
2084 }
2085
2086 return claimintf(ps, dc.interface);
2087 }
2088
2089 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2090 {
2091 unsigned num_streams, num_eps;
2092 struct usb_host_endpoint **eps;
2093 struct usb_interface *intf;
2094 int r;
2095
2096 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2097 &eps, &intf);
2098 if (r)
2099 return r;
2100
2101 destroy_async_on_interface(ps,
2102 intf->altsetting[0].desc.bInterfaceNumber);
2103
2104 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2105 kfree(eps);
2106 return r;
2107 }
2108
2109 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2110 {
2111 unsigned num_eps;
2112 struct usb_host_endpoint **eps;
2113 struct usb_interface *intf;
2114 int r;
2115
2116 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2117 if (r)
2118 return r;
2119
2120 destroy_async_on_interface(ps,
2121 intf->altsetting[0].desc.bInterfaceNumber);
2122
2123 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2124 kfree(eps);
2125 return r;
2126 }
2127
2128 /*
2129 * NOTE: All requests here that have interface numbers as parameters
2130 * are assuming that somehow the configuration has been prevented from
2131 * changing. But there's no mechanism to ensure that...
2132 */
2133 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2134 void __user *p)
2135 {
2136 struct usb_dev_state *ps = file->private_data;
2137 struct inode *inode = file_inode(file);
2138 struct usb_device *dev = ps->dev;
2139 int ret = -ENOTTY;
2140
2141 if (!(file->f_mode & FMODE_WRITE))
2142 return -EPERM;
2143
2144 usb_lock_device(dev);
2145
2146 /* Reap operations are allowed even after disconnection */
2147 switch (cmd) {
2148 case USBDEVFS_REAPURB:
2149 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2150 ret = proc_reapurb(ps, p);
2151 goto done;
2152
2153 case USBDEVFS_REAPURBNDELAY:
2154 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2155 ret = proc_reapurbnonblock(ps, p);
2156 goto done;
2157
2158 #ifdef CONFIG_COMPAT
2159 case USBDEVFS_REAPURB32:
2160 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2161 ret = proc_reapurb_compat(ps, p);
2162 goto done;
2163
2164 case USBDEVFS_REAPURBNDELAY32:
2165 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2166 ret = proc_reapurbnonblock_compat(ps, p);
2167 goto done;
2168 #endif
2169 }
2170
2171 if (!connected(ps)) {
2172 usb_unlock_device(dev);
2173 return -ENODEV;
2174 }
2175
2176 switch (cmd) {
2177 case USBDEVFS_CONTROL:
2178 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2179 ret = proc_control(ps, p);
2180 if (ret >= 0)
2181 inode->i_mtime = CURRENT_TIME;
2182 break;
2183
2184 case USBDEVFS_BULK:
2185 snoop(&dev->dev, "%s: BULK\n", __func__);
2186 ret = proc_bulk(ps, p);
2187 if (ret >= 0)
2188 inode->i_mtime = CURRENT_TIME;
2189 break;
2190
2191 case USBDEVFS_RESETEP:
2192 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2193 ret = proc_resetep(ps, p);
2194 if (ret >= 0)
2195 inode->i_mtime = CURRENT_TIME;
2196 break;
2197
2198 case USBDEVFS_RESET:
2199 snoop(&dev->dev, "%s: RESET\n", __func__);
2200 ret = proc_resetdevice(ps);
2201 break;
2202
2203 case USBDEVFS_CLEAR_HALT:
2204 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2205 ret = proc_clearhalt(ps, p);
2206 if (ret >= 0)
2207 inode->i_mtime = CURRENT_TIME;
2208 break;
2209
2210 case USBDEVFS_GETDRIVER:
2211 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2212 ret = proc_getdriver(ps, p);
2213 break;
2214
2215 case USBDEVFS_CONNECTINFO:
2216 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2217 ret = proc_connectinfo(ps, p);
2218 break;
2219
2220 case USBDEVFS_SETINTERFACE:
2221 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2222 ret = proc_setintf(ps, p);
2223 break;
2224
2225 case USBDEVFS_SETCONFIGURATION:
2226 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2227 ret = proc_setconfig(ps, p);
2228 break;
2229
2230 case USBDEVFS_SUBMITURB:
2231 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2232 ret = proc_submiturb(ps, p);
2233 if (ret >= 0)
2234 inode->i_mtime = CURRENT_TIME;
2235 break;
2236
2237 #ifdef CONFIG_COMPAT
2238 case USBDEVFS_CONTROL32:
2239 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2240 ret = proc_control_compat(ps, p);
2241 if (ret >= 0)
2242 inode->i_mtime = CURRENT_TIME;
2243 break;
2244
2245 case USBDEVFS_BULK32:
2246 snoop(&dev->dev, "%s: BULK32\n", __func__);
2247 ret = proc_bulk_compat(ps, p);
2248 if (ret >= 0)
2249 inode->i_mtime = CURRENT_TIME;
2250 break;
2251
2252 case USBDEVFS_DISCSIGNAL32:
2253 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2254 ret = proc_disconnectsignal_compat(ps, p);
2255 break;
2256
2257 case USBDEVFS_SUBMITURB32:
2258 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2259 ret = proc_submiturb_compat(ps, p);
2260 if (ret >= 0)
2261 inode->i_mtime = CURRENT_TIME;
2262 break;
2263
2264 case USBDEVFS_IOCTL32:
2265 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2266 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2267 break;
2268 #endif
2269
2270 case USBDEVFS_DISCARDURB:
2271 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2272 ret = proc_unlinkurb(ps, p);
2273 break;
2274
2275 case USBDEVFS_DISCSIGNAL:
2276 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2277 ret = proc_disconnectsignal(ps, p);
2278 break;
2279
2280 case USBDEVFS_CLAIMINTERFACE:
2281 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2282 ret = proc_claiminterface(ps, p);
2283 break;
2284
2285 case USBDEVFS_RELEASEINTERFACE:
2286 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2287 ret = proc_releaseinterface(ps, p);
2288 break;
2289
2290 case USBDEVFS_IOCTL:
2291 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2292 ret = proc_ioctl_default(ps, p);
2293 break;
2294
2295 case USBDEVFS_CLAIM_PORT:
2296 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2297 ret = proc_claim_port(ps, p);
2298 break;
2299
2300 case USBDEVFS_RELEASE_PORT:
2301 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2302 ret = proc_release_port(ps, p);
2303 break;
2304 case USBDEVFS_GET_CAPABILITIES:
2305 ret = proc_get_capabilities(ps, p);
2306 break;
2307 case USBDEVFS_DISCONNECT_CLAIM:
2308 ret = proc_disconnect_claim(ps, p);
2309 break;
2310 case USBDEVFS_ALLOC_STREAMS:
2311 ret = proc_alloc_streams(ps, p);
2312 break;
2313 case USBDEVFS_FREE_STREAMS:
2314 ret = proc_free_streams(ps, p);
2315 break;
2316 }
2317
2318 done:
2319 usb_unlock_device(dev);
2320 if (ret >= 0)
2321 inode->i_atime = CURRENT_TIME;
2322 return ret;
2323 }
2324
2325 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2326 unsigned long arg)
2327 {
2328 int ret;
2329
2330 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2331
2332 return ret;
2333 }
2334
2335 #ifdef CONFIG_COMPAT
2336 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2337 unsigned long arg)
2338 {
2339 int ret;
2340
2341 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2342
2343 return ret;
2344 }
2345 #endif
2346
2347 /* No kernel lock - fine */
2348 static unsigned int usbdev_poll(struct file *file,
2349 struct poll_table_struct *wait)
2350 {
2351 struct usb_dev_state *ps = file->private_data;
2352 unsigned int mask = 0;
2353
2354 poll_wait(file, &ps->wait, wait);
2355 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2356 mask |= POLLOUT | POLLWRNORM;
2357 if (!connected(ps))
2358 mask |= POLLERR | POLLHUP;
2359 return mask;
2360 }
2361
2362 const struct file_operations usbdev_file_operations = {
2363 .owner = THIS_MODULE,
2364 .llseek = usbdev_lseek,
2365 .read = usbdev_read,
2366 .poll = usbdev_poll,
2367 .unlocked_ioctl = usbdev_ioctl,
2368 #ifdef CONFIG_COMPAT
2369 .compat_ioctl = usbdev_compat_ioctl,
2370 #endif
2371 .open = usbdev_open,
2372 .release = usbdev_release,
2373 };
2374
2375 static void usbdev_remove(struct usb_device *udev)
2376 {
2377 struct usb_dev_state *ps;
2378 struct siginfo sinfo;
2379
2380 while (!list_empty(&udev->filelist)) {
2381 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2382 destroy_all_async(ps);
2383 wake_up_all(&ps->wait);
2384 list_del_init(&ps->list);
2385 if (ps->discsignr) {
2386 memset(&sinfo, 0, sizeof(sinfo));
2387 sinfo.si_signo = ps->discsignr;
2388 sinfo.si_errno = EPIPE;
2389 sinfo.si_code = SI_ASYNCIO;
2390 sinfo.si_addr = ps->disccontext;
2391 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2392 ps->disc_pid, ps->cred, ps->secid);
2393 }
2394 }
2395 }
2396
2397 static int usbdev_notify(struct notifier_block *self,
2398 unsigned long action, void *dev)
2399 {
2400 switch (action) {
2401 case USB_DEVICE_ADD:
2402 break;
2403 case USB_DEVICE_REMOVE:
2404 usbdev_remove(dev);
2405 break;
2406 }
2407 return NOTIFY_OK;
2408 }
2409
2410 static struct notifier_block usbdev_nb = {
2411 .notifier_call = usbdev_notify,
2412 };
2413
2414 static struct cdev usb_device_cdev;
2415
2416 int __init usb_devio_init(void)
2417 {
2418 int retval;
2419
2420 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2421 "usb_device");
2422 if (retval) {
2423 printk(KERN_ERR "Unable to register minors for usb_device\n");
2424 goto out;
2425 }
2426 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2427 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2428 if (retval) {
2429 printk(KERN_ERR "Unable to get usb_device major %d\n",
2430 USB_DEVICE_MAJOR);
2431 goto error_cdev;
2432 }
2433 usb_register_notify(&usbdev_nb);
2434 out:
2435 return retval;
2436
2437 error_cdev:
2438 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2439 goto out;
2440 }
2441
2442 void usb_devio_cleanup(void)
2443 {
2444 usb_unregister_notify(&usbdev_nb);
2445 cdev_del(&usb_device_cdev);
2446 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2447 }
Linux kernel - Deliverables
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