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Merge tag 'iio-fixes-for-4.5a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[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 static unsigned usbfs_snoop_max = 65536;
104 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(usbfs_snoop_max,
106 "maximum number of bytes to print while snooping");
107
108 #define snoop(dev, format, arg...) \
109 do { \
110 if (usbfs_snoop) \
111 dev_info(dev, format, ## arg); \
112 } while (0)
113
114 enum snoop_when {
115 SUBMIT, COMPLETE
116 };
117
118 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
119
120 /* Limit on the total amount of memory we can allocate for transfers */
121 static unsigned usbfs_memory_mb = 16;
122 module_param(usbfs_memory_mb, uint, 0644);
123 MODULE_PARM_DESC(usbfs_memory_mb,
124 "maximum MB allowed for usbfs buffers (0 = no limit)");
125
126 /* Hard limit, necessary to avoid arithmetic overflow */
127 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
128
129 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
130
131 /* Check whether it's okay to allocate more memory for a transfer */
132 static int usbfs_increase_memory_usage(unsigned amount)
133 {
134 unsigned lim;
135
136 /*
137 * Convert usbfs_memory_mb to bytes, avoiding overflows.
138 * 0 means use the hard limit (effectively unlimited).
139 */
140 lim = ACCESS_ONCE(usbfs_memory_mb);
141 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
142 lim = USBFS_XFER_MAX;
143 else
144 lim <<= 20;
145
146 atomic_add(amount, &usbfs_memory_usage);
147 if (atomic_read(&usbfs_memory_usage) <= lim)
148 return 0;
149 atomic_sub(amount, &usbfs_memory_usage);
150 return -ENOMEM;
151 }
152
153 /* Memory for a transfer is being deallocated */
154 static void usbfs_decrease_memory_usage(unsigned amount)
155 {
156 atomic_sub(amount, &usbfs_memory_usage);
157 }
158
159 static int connected(struct usb_dev_state *ps)
160 {
161 return (!list_empty(&ps->list) &&
162 ps->dev->state != USB_STATE_NOTATTACHED);
163 }
164
165 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
166 loff_t *ppos)
167 {
168 struct usb_dev_state *ps = file->private_data;
169 struct usb_device *dev = ps->dev;
170 ssize_t ret = 0;
171 unsigned len;
172 loff_t pos;
173 int i;
174
175 pos = *ppos;
176 usb_lock_device(dev);
177 if (!connected(ps)) {
178 ret = -ENODEV;
179 goto err;
180 } else if (pos < 0) {
181 ret = -EINVAL;
182 goto err;
183 }
184
185 if (pos < sizeof(struct usb_device_descriptor)) {
186 /* 18 bytes - fits on the stack */
187 struct usb_device_descriptor temp_desc;
188
189 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
190 le16_to_cpus(&temp_desc.bcdUSB);
191 le16_to_cpus(&temp_desc.idVendor);
192 le16_to_cpus(&temp_desc.idProduct);
193 le16_to_cpus(&temp_desc.bcdDevice);
194
195 len = sizeof(struct usb_device_descriptor) - pos;
196 if (len > nbytes)
197 len = nbytes;
198 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
199 ret = -EFAULT;
200 goto err;
201 }
202
203 *ppos += len;
204 buf += len;
205 nbytes -= len;
206 ret += len;
207 }
208
209 pos = sizeof(struct usb_device_descriptor);
210 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
211 struct usb_config_descriptor *config =
212 (struct usb_config_descriptor *)dev->rawdescriptors[i];
213 unsigned int length = le16_to_cpu(config->wTotalLength);
214
215 if (*ppos < pos + length) {
216
217 /* The descriptor may claim to be longer than it
218 * really is. Here is the actual allocated length. */
219 unsigned alloclen =
220 le16_to_cpu(dev->config[i].desc.wTotalLength);
221
222 len = length - (*ppos - pos);
223 if (len > nbytes)
224 len = nbytes;
225
226 /* Simply don't write (skip over) unallocated parts */
227 if (alloclen > (*ppos - pos)) {
228 alloclen -= (*ppos - pos);
229 if (copy_to_user(buf,
230 dev->rawdescriptors[i] + (*ppos - pos),
231 min(len, alloclen))) {
232 ret = -EFAULT;
233 goto err;
234 }
235 }
236
237 *ppos += len;
238 buf += len;
239 nbytes -= len;
240 ret += len;
241 }
242
243 pos += length;
244 }
245
246 err:
247 usb_unlock_device(dev);
248 return ret;
249 }
250
251 /*
252 * async list handling
253 */
254
255 static struct async *alloc_async(unsigned int numisoframes)
256 {
257 struct async *as;
258
259 as = kzalloc(sizeof(struct async), GFP_KERNEL);
260 if (!as)
261 return NULL;
262 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
263 if (!as->urb) {
264 kfree(as);
265 return NULL;
266 }
267 return as;
268 }
269
270 static void free_async(struct async *as)
271 {
272 int i;
273
274 put_pid(as->pid);
275 if (as->cred)
276 put_cred(as->cred);
277 for (i = 0; i < as->urb->num_sgs; i++) {
278 if (sg_page(&as->urb->sg[i]))
279 kfree(sg_virt(&as->urb->sg[i]));
280 }
281 kfree(as->urb->sg);
282 kfree(as->urb->transfer_buffer);
283 kfree(as->urb->setup_packet);
284 usb_free_urb(as->urb);
285 usbfs_decrease_memory_usage(as->mem_usage);
286 kfree(as);
287 }
288
289 static void async_newpending(struct async *as)
290 {
291 struct usb_dev_state *ps = as->ps;
292 unsigned long flags;
293
294 spin_lock_irqsave(&ps->lock, flags);
295 list_add_tail(&as->asynclist, &ps->async_pending);
296 spin_unlock_irqrestore(&ps->lock, flags);
297 }
298
299 static void async_removepending(struct async *as)
300 {
301 struct usb_dev_state *ps = as->ps;
302 unsigned long flags;
303
304 spin_lock_irqsave(&ps->lock, flags);
305 list_del_init(&as->asynclist);
306 spin_unlock_irqrestore(&ps->lock, flags);
307 }
308
309 static struct async *async_getcompleted(struct usb_dev_state *ps)
310 {
311 unsigned long flags;
312 struct async *as = NULL;
313
314 spin_lock_irqsave(&ps->lock, flags);
315 if (!list_empty(&ps->async_completed)) {
316 as = list_entry(ps->async_completed.next, struct async,
317 asynclist);
318 list_del_init(&as->asynclist);
319 }
320 spin_unlock_irqrestore(&ps->lock, flags);
321 return as;
322 }
323
324 static struct async *async_getpending(struct usb_dev_state *ps,
325 void __user *userurb)
326 {
327 struct async *as;
328
329 list_for_each_entry(as, &ps->async_pending, asynclist)
330 if (as->userurb == userurb) {
331 list_del_init(&as->asynclist);
332 return as;
333 }
334
335 return NULL;
336 }
337
338 static void snoop_urb(struct usb_device *udev,
339 void __user *userurb, int pipe, unsigned length,
340 int timeout_or_status, enum snoop_when when,
341 unsigned char *data, unsigned data_len)
342 {
343 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
344 static const char *dirs[] = {"out", "in"};
345 int ep;
346 const char *t, *d;
347
348 if (!usbfs_snoop)
349 return;
350
351 ep = usb_pipeendpoint(pipe);
352 t = types[usb_pipetype(pipe)];
353 d = dirs[!!usb_pipein(pipe)];
354
355 if (userurb) { /* Async */
356 if (when == SUBMIT)
357 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
358 "length %u\n",
359 userurb, ep, t, d, length);
360 else
361 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
362 "actual_length %u status %d\n",
363 userurb, ep, t, d, length,
364 timeout_or_status);
365 } else {
366 if (when == SUBMIT)
367 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
368 "timeout %d\n",
369 ep, t, d, length, timeout_or_status);
370 else
371 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
372 "status %d\n",
373 ep, t, d, length, timeout_or_status);
374 }
375
376 data_len = min(data_len, usbfs_snoop_max);
377 if (data && data_len > 0) {
378 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
379 data, data_len, 1);
380 }
381 }
382
383 static void snoop_urb_data(struct urb *urb, unsigned len)
384 {
385 int i, size;
386
387 len = min(len, usbfs_snoop_max);
388 if (!usbfs_snoop || len == 0)
389 return;
390
391 if (urb->num_sgs == 0) {
392 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
393 urb->transfer_buffer, len, 1);
394 return;
395 }
396
397 for (i = 0; i < urb->num_sgs && len; i++) {
398 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
399 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
400 sg_virt(&urb->sg[i]), size, 1);
401 len -= size;
402 }
403 }
404
405 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
406 {
407 unsigned i, len, size;
408
409 if (urb->number_of_packets > 0) /* Isochronous */
410 len = urb->transfer_buffer_length;
411 else /* Non-Isoc */
412 len = urb->actual_length;
413
414 if (urb->num_sgs == 0) {
415 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
416 return -EFAULT;
417 return 0;
418 }
419
420 for (i = 0; i < urb->num_sgs && len; i++) {
421 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
422 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
423 return -EFAULT;
424 userbuffer += size;
425 len -= size;
426 }
427
428 return 0;
429 }
430
431 #define AS_CONTINUATION 1
432 #define AS_UNLINK 2
433
434 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
435 __releases(ps->lock)
436 __acquires(ps->lock)
437 {
438 struct urb *urb;
439 struct async *as;
440
441 /* Mark all the pending URBs that match bulk_addr, up to but not
442 * including the first one without AS_CONTINUATION. If such an
443 * URB is encountered then a new transfer has already started so
444 * the endpoint doesn't need to be disabled; otherwise it does.
445 */
446 list_for_each_entry(as, &ps->async_pending, asynclist) {
447 if (as->bulk_addr == bulk_addr) {
448 if (as->bulk_status != AS_CONTINUATION)
449 goto rescan;
450 as->bulk_status = AS_UNLINK;
451 as->bulk_addr = 0;
452 }
453 }
454 ps->disabled_bulk_eps |= (1 << bulk_addr);
455
456 /* Now carefully unlink all the marked pending URBs */
457 rescan:
458 list_for_each_entry(as, &ps->async_pending, asynclist) {
459 if (as->bulk_status == AS_UNLINK) {
460 as->bulk_status = 0; /* Only once */
461 urb = as->urb;
462 usb_get_urb(urb);
463 spin_unlock(&ps->lock); /* Allow completions */
464 usb_unlink_urb(urb);
465 usb_put_urb(urb);
466 spin_lock(&ps->lock);
467 goto rescan;
468 }
469 }
470 }
471
472 static void async_completed(struct urb *urb)
473 {
474 struct async *as = urb->context;
475 struct usb_dev_state *ps = as->ps;
476 struct siginfo sinfo;
477 struct pid *pid = NULL;
478 u32 secid = 0;
479 const struct cred *cred = NULL;
480 int signr;
481
482 spin_lock(&ps->lock);
483 list_move_tail(&as->asynclist, &ps->async_completed);
484 as->status = urb->status;
485 signr = as->signr;
486 if (signr) {
487 memset(&sinfo, 0, sizeof(sinfo));
488 sinfo.si_signo = as->signr;
489 sinfo.si_errno = as->status;
490 sinfo.si_code = SI_ASYNCIO;
491 sinfo.si_addr = as->userurb;
492 pid = get_pid(as->pid);
493 cred = get_cred(as->cred);
494 secid = as->secid;
495 }
496 snoop(&urb->dev->dev, "urb complete\n");
497 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
498 as->status, COMPLETE, NULL, 0);
499 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
500 snoop_urb_data(urb, urb->actual_length);
501
502 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
503 as->status != -ENOENT)
504 cancel_bulk_urbs(ps, as->bulk_addr);
505 spin_unlock(&ps->lock);
506
507 if (signr) {
508 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
509 put_pid(pid);
510 put_cred(cred);
511 }
512
513 wake_up(&ps->wait);
514 }
515
516 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
517 {
518 struct urb *urb;
519 struct async *as;
520 unsigned long flags;
521
522 spin_lock_irqsave(&ps->lock, flags);
523 while (!list_empty(list)) {
524 as = list_entry(list->next, struct async, asynclist);
525 list_del_init(&as->asynclist);
526 urb = as->urb;
527 usb_get_urb(urb);
528
529 /* drop the spinlock so the completion handler can run */
530 spin_unlock_irqrestore(&ps->lock, flags);
531 usb_kill_urb(urb);
532 usb_put_urb(urb);
533 spin_lock_irqsave(&ps->lock, flags);
534 }
535 spin_unlock_irqrestore(&ps->lock, flags);
536 }
537
538 static void destroy_async_on_interface(struct usb_dev_state *ps,
539 unsigned int ifnum)
540 {
541 struct list_head *p, *q, hitlist;
542 unsigned long flags;
543
544 INIT_LIST_HEAD(&hitlist);
545 spin_lock_irqsave(&ps->lock, flags);
546 list_for_each_safe(p, q, &ps->async_pending)
547 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
548 list_move_tail(p, &hitlist);
549 spin_unlock_irqrestore(&ps->lock, flags);
550 destroy_async(ps, &hitlist);
551 }
552
553 static void destroy_all_async(struct usb_dev_state *ps)
554 {
555 destroy_async(ps, &ps->async_pending);
556 }
557
558 /*
559 * interface claims are made only at the request of user level code,
560 * which can also release them (explicitly or by closing files).
561 * they're also undone when devices disconnect.
562 */
563
564 static int driver_probe(struct usb_interface *intf,
565 const struct usb_device_id *id)
566 {
567 return -ENODEV;
568 }
569
570 static void driver_disconnect(struct usb_interface *intf)
571 {
572 struct usb_dev_state *ps = usb_get_intfdata(intf);
573 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
574
575 if (!ps)
576 return;
577
578 /* NOTE: this relies on usbcore having canceled and completed
579 * all pending I/O requests; 2.6 does that.
580 */
581
582 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
583 clear_bit(ifnum, &ps->ifclaimed);
584 else
585 dev_warn(&intf->dev, "interface number %u out of range\n",
586 ifnum);
587
588 usb_set_intfdata(intf, NULL);
589
590 /* force async requests to complete */
591 destroy_async_on_interface(ps, ifnum);
592 }
593
594 /* The following routines are merely placeholders. There is no way
595 * to inform a user task about suspend or resumes.
596 */
597 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
598 {
599 return 0;
600 }
601
602 static int driver_resume(struct usb_interface *intf)
603 {
604 return 0;
605 }
606
607 struct usb_driver usbfs_driver = {
608 .name = "usbfs",
609 .probe = driver_probe,
610 .disconnect = driver_disconnect,
611 .suspend = driver_suspend,
612 .resume = driver_resume,
613 };
614
615 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
616 {
617 struct usb_device *dev = ps->dev;
618 struct usb_interface *intf;
619 int err;
620
621 if (ifnum >= 8*sizeof(ps->ifclaimed))
622 return -EINVAL;
623 /* already claimed */
624 if (test_bit(ifnum, &ps->ifclaimed))
625 return 0;
626
627 intf = usb_ifnum_to_if(dev, ifnum);
628 if (!intf)
629 err = -ENOENT;
630 else
631 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
632 if (err == 0)
633 set_bit(ifnum, &ps->ifclaimed);
634 return err;
635 }
636
637 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
638 {
639 struct usb_device *dev;
640 struct usb_interface *intf;
641 int err;
642
643 err = -EINVAL;
644 if (ifnum >= 8*sizeof(ps->ifclaimed))
645 return err;
646 dev = ps->dev;
647 intf = usb_ifnum_to_if(dev, ifnum);
648 if (!intf)
649 err = -ENOENT;
650 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
651 usb_driver_release_interface(&usbfs_driver, intf);
652 err = 0;
653 }
654 return err;
655 }
656
657 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
658 {
659 if (ps->dev->state != USB_STATE_CONFIGURED)
660 return -EHOSTUNREACH;
661 if (ifnum >= 8*sizeof(ps->ifclaimed))
662 return -EINVAL;
663 if (test_bit(ifnum, &ps->ifclaimed))
664 return 0;
665 /* if not yet claimed, claim it for the driver */
666 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
667 "interface %u before use\n", task_pid_nr(current),
668 current->comm, ifnum);
669 return claimintf(ps, ifnum);
670 }
671
672 static int findintfep(struct usb_device *dev, unsigned int ep)
673 {
674 unsigned int i, j, e;
675 struct usb_interface *intf;
676 struct usb_host_interface *alts;
677 struct usb_endpoint_descriptor *endpt;
678
679 if (ep & ~(USB_DIR_IN|0xf))
680 return -EINVAL;
681 if (!dev->actconfig)
682 return -ESRCH;
683 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
684 intf = dev->actconfig->interface[i];
685 for (j = 0; j < intf->num_altsetting; j++) {
686 alts = &intf->altsetting[j];
687 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
688 endpt = &alts->endpoint[e].desc;
689 if (endpt->bEndpointAddress == ep)
690 return alts->desc.bInterfaceNumber;
691 }
692 }
693 }
694 return -ENOENT;
695 }
696
697 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
698 unsigned int request, unsigned int index)
699 {
700 int ret = 0;
701 struct usb_host_interface *alt_setting;
702
703 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
704 && ps->dev->state != USB_STATE_ADDRESS
705 && ps->dev->state != USB_STATE_CONFIGURED)
706 return -EHOSTUNREACH;
707 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
708 return 0;
709
710 /*
711 * check for the special corner case 'get_device_id' in the printer
712 * class specification, which we always want to allow as it is used
713 * to query things like ink level, etc.
714 */
715 if (requesttype == 0xa1 && request == 0) {
716 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
717 index >> 8, index & 0xff);
718 if (alt_setting
719 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
720 return 0;
721 }
722
723 index &= 0xff;
724 switch (requesttype & USB_RECIP_MASK) {
725 case USB_RECIP_ENDPOINT:
726 if ((index & ~USB_DIR_IN) == 0)
727 return 0;
728 ret = findintfep(ps->dev, index);
729 if (ret < 0) {
730 /*
731 * Some not fully compliant Win apps seem to get
732 * index wrong and have the endpoint number here
733 * rather than the endpoint address (with the
734 * correct direction). Win does let this through,
735 * so we'll not reject it here but leave it to
736 * the device to not break KVM. But we warn.
737 */
738 ret = findintfep(ps->dev, index ^ 0x80);
739 if (ret >= 0)
740 dev_info(&ps->dev->dev,
741 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
742 __func__, task_pid_nr(current),
743 current->comm, index, index ^ 0x80);
744 }
745 if (ret >= 0)
746 ret = checkintf(ps, ret);
747 break;
748
749 case USB_RECIP_INTERFACE:
750 ret = checkintf(ps, index);
751 break;
752 }
753 return ret;
754 }
755
756 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
757 unsigned char ep)
758 {
759 if (ep & USB_ENDPOINT_DIR_MASK)
760 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
761 else
762 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
763 }
764
765 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
766 struct usbdevfs_streams __user *streams,
767 unsigned int *num_streams_ret,
768 unsigned int *num_eps_ret,
769 struct usb_host_endpoint ***eps_ret,
770 struct usb_interface **intf_ret)
771 {
772 unsigned int i, num_streams, num_eps;
773 struct usb_host_endpoint **eps;
774 struct usb_interface *intf = NULL;
775 unsigned char ep;
776 int ifnum, ret;
777
778 if (get_user(num_streams, &streams->num_streams) ||
779 get_user(num_eps, &streams->num_eps))
780 return -EFAULT;
781
782 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
783 return -EINVAL;
784
785 /* The XHCI controller allows max 2 ^ 16 streams */
786 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
787 return -EINVAL;
788
789 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
790 if (!eps)
791 return -ENOMEM;
792
793 for (i = 0; i < num_eps; i++) {
794 if (get_user(ep, &streams->eps[i])) {
795 ret = -EFAULT;
796 goto error;
797 }
798 eps[i] = ep_to_host_endpoint(ps->dev, ep);
799 if (!eps[i]) {
800 ret = -EINVAL;
801 goto error;
802 }
803
804 /* usb_alloc/free_streams operate on an usb_interface */
805 ifnum = findintfep(ps->dev, ep);
806 if (ifnum < 0) {
807 ret = ifnum;
808 goto error;
809 }
810
811 if (i == 0) {
812 ret = checkintf(ps, ifnum);
813 if (ret < 0)
814 goto error;
815 intf = usb_ifnum_to_if(ps->dev, ifnum);
816 } else {
817 /* Verify all eps belong to the same interface */
818 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
819 ret = -EINVAL;
820 goto error;
821 }
822 }
823 }
824
825 if (num_streams_ret)
826 *num_streams_ret = num_streams;
827 *num_eps_ret = num_eps;
828 *eps_ret = eps;
829 *intf_ret = intf;
830
831 return 0;
832
833 error:
834 kfree(eps);
835 return ret;
836 }
837
838 static int match_devt(struct device *dev, void *data)
839 {
840 return dev->devt == (dev_t) (unsigned long) data;
841 }
842
843 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
844 {
845 struct device *dev;
846
847 dev = bus_find_device(&usb_bus_type, NULL,
848 (void *) (unsigned long) devt, match_devt);
849 if (!dev)
850 return NULL;
851 return container_of(dev, struct usb_device, dev);
852 }
853
854 /*
855 * file operations
856 */
857 static int usbdev_open(struct inode *inode, struct file *file)
858 {
859 struct usb_device *dev = NULL;
860 struct usb_dev_state *ps;
861 int ret;
862
863 ret = -ENOMEM;
864 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
865 if (!ps)
866 goto out_free_ps;
867
868 ret = -ENODEV;
869
870 /* Protect against simultaneous removal or release */
871 mutex_lock(&usbfs_mutex);
872
873 /* usbdev device-node */
874 if (imajor(inode) == USB_DEVICE_MAJOR)
875 dev = usbdev_lookup_by_devt(inode->i_rdev);
876
877 mutex_unlock(&usbfs_mutex);
878
879 if (!dev)
880 goto out_free_ps;
881
882 usb_lock_device(dev);
883 if (dev->state == USB_STATE_NOTATTACHED)
884 goto out_unlock_device;
885
886 ret = usb_autoresume_device(dev);
887 if (ret)
888 goto out_unlock_device;
889
890 ps->dev = dev;
891 ps->file = file;
892 spin_lock_init(&ps->lock);
893 INIT_LIST_HEAD(&ps->list);
894 INIT_LIST_HEAD(&ps->async_pending);
895 INIT_LIST_HEAD(&ps->async_completed);
896 init_waitqueue_head(&ps->wait);
897 ps->discsignr = 0;
898 ps->disc_pid = get_pid(task_pid(current));
899 ps->cred = get_current_cred();
900 ps->disccontext = NULL;
901 ps->ifclaimed = 0;
902 security_task_getsecid(current, &ps->secid);
903 smp_wmb();
904 list_add_tail(&ps->list, &dev->filelist);
905 file->private_data = ps;
906 usb_unlock_device(dev);
907 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
908 current->comm);
909 return ret;
910
911 out_unlock_device:
912 usb_unlock_device(dev);
913 usb_put_dev(dev);
914 out_free_ps:
915 kfree(ps);
916 return ret;
917 }
918
919 static int usbdev_release(struct inode *inode, struct file *file)
920 {
921 struct usb_dev_state *ps = file->private_data;
922 struct usb_device *dev = ps->dev;
923 unsigned int ifnum;
924 struct async *as;
925
926 usb_lock_device(dev);
927 usb_hub_release_all_ports(dev, ps);
928
929 list_del_init(&ps->list);
930
931 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
932 ifnum++) {
933 if (test_bit(ifnum, &ps->ifclaimed))
934 releaseintf(ps, ifnum);
935 }
936 destroy_all_async(ps);
937 usb_autosuspend_device(dev);
938 usb_unlock_device(dev);
939 usb_put_dev(dev);
940 put_pid(ps->disc_pid);
941 put_cred(ps->cred);
942
943 as = async_getcompleted(ps);
944 while (as) {
945 free_async(as);
946 as = async_getcompleted(ps);
947 }
948 kfree(ps);
949 return 0;
950 }
951
952 static int proc_control(struct usb_dev_state *ps, void __user *arg)
953 {
954 struct usb_device *dev = ps->dev;
955 struct usbdevfs_ctrltransfer ctrl;
956 unsigned int tmo;
957 unsigned char *tbuf;
958 unsigned wLength;
959 int i, pipe, ret;
960
961 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
962 return -EFAULT;
963 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
964 ctrl.wIndex);
965 if (ret)
966 return ret;
967 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
968 if (wLength > PAGE_SIZE)
969 return -EINVAL;
970 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
971 sizeof(struct usb_ctrlrequest));
972 if (ret)
973 return ret;
974 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
975 if (!tbuf) {
976 ret = -ENOMEM;
977 goto done;
978 }
979 tmo = ctrl.timeout;
980 snoop(&dev->dev, "control urb: bRequestType=%02x "
981 "bRequest=%02x wValue=%04x "
982 "wIndex=%04x wLength=%04x\n",
983 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
984 ctrl.wIndex, ctrl.wLength);
985 if (ctrl.bRequestType & 0x80) {
986 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
987 ctrl.wLength)) {
988 ret = -EINVAL;
989 goto done;
990 }
991 pipe = usb_rcvctrlpipe(dev, 0);
992 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
993
994 usb_unlock_device(dev);
995 i = usb_control_msg(dev, pipe, ctrl.bRequest,
996 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
997 tbuf, ctrl.wLength, tmo);
998 usb_lock_device(dev);
999 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1000 tbuf, max(i, 0));
1001 if ((i > 0) && ctrl.wLength) {
1002 if (copy_to_user(ctrl.data, tbuf, i)) {
1003 ret = -EFAULT;
1004 goto done;
1005 }
1006 }
1007 } else {
1008 if (ctrl.wLength) {
1009 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1010 ret = -EFAULT;
1011 goto done;
1012 }
1013 }
1014 pipe = usb_sndctrlpipe(dev, 0);
1015 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1016 tbuf, ctrl.wLength);
1017
1018 usb_unlock_device(dev);
1019 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1020 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1021 tbuf, ctrl.wLength, tmo);
1022 usb_lock_device(dev);
1023 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1024 }
1025 if (i < 0 && i != -EPIPE) {
1026 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1027 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1028 current->comm, ctrl.bRequestType, ctrl.bRequest,
1029 ctrl.wLength, i);
1030 }
1031 ret = i;
1032 done:
1033 free_page((unsigned long) tbuf);
1034 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1035 sizeof(struct usb_ctrlrequest));
1036 return ret;
1037 }
1038
1039 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1040 {
1041 struct usb_device *dev = ps->dev;
1042 struct usbdevfs_bulktransfer bulk;
1043 unsigned int tmo, len1, pipe;
1044 int len2;
1045 unsigned char *tbuf;
1046 int i, ret;
1047
1048 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1049 return -EFAULT;
1050 ret = findintfep(ps->dev, bulk.ep);
1051 if (ret < 0)
1052 return ret;
1053 ret = checkintf(ps, ret);
1054 if (ret)
1055 return ret;
1056 if (bulk.ep & USB_DIR_IN)
1057 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1058 else
1059 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1060 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1061 return -EINVAL;
1062 len1 = bulk.len;
1063 if (len1 >= USBFS_XFER_MAX)
1064 return -EINVAL;
1065 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1066 if (ret)
1067 return ret;
1068 tbuf = kmalloc(len1, GFP_KERNEL);
1069 if (!tbuf) {
1070 ret = -ENOMEM;
1071 goto done;
1072 }
1073 tmo = bulk.timeout;
1074 if (bulk.ep & 0x80) {
1075 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1076 ret = -EINVAL;
1077 goto done;
1078 }
1079 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1080
1081 usb_unlock_device(dev);
1082 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1083 usb_lock_device(dev);
1084 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1085
1086 if (!i && len2) {
1087 if (copy_to_user(bulk.data, tbuf, len2)) {
1088 ret = -EFAULT;
1089 goto done;
1090 }
1091 }
1092 } else {
1093 if (len1) {
1094 if (copy_from_user(tbuf, bulk.data, len1)) {
1095 ret = -EFAULT;
1096 goto done;
1097 }
1098 }
1099 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1100
1101 usb_unlock_device(dev);
1102 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1103 usb_lock_device(dev);
1104 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1105 }
1106 ret = (i < 0 ? i : len2);
1107 done:
1108 kfree(tbuf);
1109 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1110 return ret;
1111 }
1112
1113 static void check_reset_of_active_ep(struct usb_device *udev,
1114 unsigned int epnum, char *ioctl_name)
1115 {
1116 struct usb_host_endpoint **eps;
1117 struct usb_host_endpoint *ep;
1118
1119 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1120 ep = eps[epnum & 0x0f];
1121 if (ep && !list_empty(&ep->urb_list))
1122 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1123 task_pid_nr(current), current->comm,
1124 ioctl_name, epnum);
1125 }
1126
1127 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1128 {
1129 unsigned int ep;
1130 int ret;
1131
1132 if (get_user(ep, (unsigned int __user *)arg))
1133 return -EFAULT;
1134 ret = findintfep(ps->dev, ep);
1135 if (ret < 0)
1136 return ret;
1137 ret = checkintf(ps, ret);
1138 if (ret)
1139 return ret;
1140 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1141 usb_reset_endpoint(ps->dev, ep);
1142 return 0;
1143 }
1144
1145 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1146 {
1147 unsigned int ep;
1148 int pipe;
1149 int ret;
1150
1151 if (get_user(ep, (unsigned int __user *)arg))
1152 return -EFAULT;
1153 ret = findintfep(ps->dev, ep);
1154 if (ret < 0)
1155 return ret;
1156 ret = checkintf(ps, ret);
1157 if (ret)
1158 return ret;
1159 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1160 if (ep & USB_DIR_IN)
1161 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1162 else
1163 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1164
1165 return usb_clear_halt(ps->dev, pipe);
1166 }
1167
1168 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1169 {
1170 struct usbdevfs_getdriver gd;
1171 struct usb_interface *intf;
1172 int ret;
1173
1174 if (copy_from_user(&gd, arg, sizeof(gd)))
1175 return -EFAULT;
1176 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1177 if (!intf || !intf->dev.driver)
1178 ret = -ENODATA;
1179 else {
1180 strlcpy(gd.driver, intf->dev.driver->name,
1181 sizeof(gd.driver));
1182 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1183 }
1184 return ret;
1185 }
1186
1187 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1188 {
1189 struct usbdevfs_connectinfo ci = {
1190 .devnum = ps->dev->devnum,
1191 .slow = ps->dev->speed == USB_SPEED_LOW
1192 };
1193
1194 if (copy_to_user(arg, &ci, sizeof(ci)))
1195 return -EFAULT;
1196 return 0;
1197 }
1198
1199 static int proc_resetdevice(struct usb_dev_state *ps)
1200 {
1201 return usb_reset_device(ps->dev);
1202 }
1203
1204 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1205 {
1206 struct usbdevfs_setinterface setintf;
1207 int ret;
1208
1209 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1210 return -EFAULT;
1211 ret = checkintf(ps, setintf.interface);
1212 if (ret)
1213 return ret;
1214
1215 destroy_async_on_interface(ps, setintf.interface);
1216
1217 return usb_set_interface(ps->dev, setintf.interface,
1218 setintf.altsetting);
1219 }
1220
1221 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1222 {
1223 int u;
1224 int status = 0;
1225 struct usb_host_config *actconfig;
1226
1227 if (get_user(u, (int __user *)arg))
1228 return -EFAULT;
1229
1230 actconfig = ps->dev->actconfig;
1231
1232 /* Don't touch the device if any interfaces are claimed.
1233 * It could interfere with other drivers' operations, and if
1234 * an interface is claimed by usbfs it could easily deadlock.
1235 */
1236 if (actconfig) {
1237 int i;
1238
1239 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1240 if (usb_interface_claimed(actconfig->interface[i])) {
1241 dev_warn(&ps->dev->dev,
1242 "usbfs: interface %d claimed by %s "
1243 "while '%s' sets config #%d\n",
1244 actconfig->interface[i]
1245 ->cur_altsetting
1246 ->desc.bInterfaceNumber,
1247 actconfig->interface[i]
1248 ->dev.driver->name,
1249 current->comm, u);
1250 status = -EBUSY;
1251 break;
1252 }
1253 }
1254 }
1255
1256 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1257 * so avoid usb_set_configuration()'s kick to sysfs
1258 */
1259 if (status == 0) {
1260 if (actconfig && actconfig->desc.bConfigurationValue == u)
1261 status = usb_reset_configuration(ps->dev);
1262 else
1263 status = usb_set_configuration(ps->dev, u);
1264 }
1265
1266 return status;
1267 }
1268
1269 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1270 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1271 void __user *arg)
1272 {
1273 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1274 struct usb_host_endpoint *ep;
1275 struct async *as = NULL;
1276 struct usb_ctrlrequest *dr = NULL;
1277 unsigned int u, totlen, isofrmlen;
1278 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1279 int number_of_packets = 0;
1280 unsigned int stream_id = 0;
1281 void *buf;
1282
1283 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1284 USBDEVFS_URB_SHORT_NOT_OK |
1285 USBDEVFS_URB_BULK_CONTINUATION |
1286 USBDEVFS_URB_NO_FSBR |
1287 USBDEVFS_URB_ZERO_PACKET |
1288 USBDEVFS_URB_NO_INTERRUPT))
1289 return -EINVAL;
1290 if (uurb->buffer_length > 0 && !uurb->buffer)
1291 return -EINVAL;
1292 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1293 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1294 ifnum = findintfep(ps->dev, uurb->endpoint);
1295 if (ifnum < 0)
1296 return ifnum;
1297 ret = checkintf(ps, ifnum);
1298 if (ret)
1299 return ret;
1300 }
1301 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1302 if (!ep)
1303 return -ENOENT;
1304 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1305
1306 u = 0;
1307 switch (uurb->type) {
1308 case USBDEVFS_URB_TYPE_CONTROL:
1309 if (!usb_endpoint_xfer_control(&ep->desc))
1310 return -EINVAL;
1311 /* min 8 byte setup packet */
1312 if (uurb->buffer_length < 8)
1313 return -EINVAL;
1314 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1315 if (!dr)
1316 return -ENOMEM;
1317 if (copy_from_user(dr, uurb->buffer, 8)) {
1318 ret = -EFAULT;
1319 goto error;
1320 }
1321 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1322 ret = -EINVAL;
1323 goto error;
1324 }
1325 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1326 le16_to_cpup(&dr->wIndex));
1327 if (ret)
1328 goto error;
1329 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1330 uurb->buffer += 8;
1331 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1332 is_in = 1;
1333 uurb->endpoint |= USB_DIR_IN;
1334 } else {
1335 is_in = 0;
1336 uurb->endpoint &= ~USB_DIR_IN;
1337 }
1338 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1339 "bRequest=%02x wValue=%04x "
1340 "wIndex=%04x wLength=%04x\n",
1341 dr->bRequestType, dr->bRequest,
1342 __le16_to_cpup(&dr->wValue),
1343 __le16_to_cpup(&dr->wIndex),
1344 __le16_to_cpup(&dr->wLength));
1345 u = sizeof(struct usb_ctrlrequest);
1346 break;
1347
1348 case USBDEVFS_URB_TYPE_BULK:
1349 switch (usb_endpoint_type(&ep->desc)) {
1350 case USB_ENDPOINT_XFER_CONTROL:
1351 case USB_ENDPOINT_XFER_ISOC:
1352 return -EINVAL;
1353 case USB_ENDPOINT_XFER_INT:
1354 /* allow single-shot interrupt transfers */
1355 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1356 goto interrupt_urb;
1357 }
1358 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1359 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1360 num_sgs = 0;
1361 if (ep->streams)
1362 stream_id = uurb->stream_id;
1363 break;
1364
1365 case USBDEVFS_URB_TYPE_INTERRUPT:
1366 if (!usb_endpoint_xfer_int(&ep->desc))
1367 return -EINVAL;
1368 interrupt_urb:
1369 break;
1370
1371 case USBDEVFS_URB_TYPE_ISO:
1372 /* arbitrary limit */
1373 if (uurb->number_of_packets < 1 ||
1374 uurb->number_of_packets > 128)
1375 return -EINVAL;
1376 if (!usb_endpoint_xfer_isoc(&ep->desc))
1377 return -EINVAL;
1378 number_of_packets = uurb->number_of_packets;
1379 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1380 number_of_packets;
1381 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1382 if (!isopkt)
1383 return -ENOMEM;
1384 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1385 ret = -EFAULT;
1386 goto error;
1387 }
1388 for (totlen = u = 0; u < number_of_packets; u++) {
1389 /*
1390 * arbitrary limit need for USB 3.0
1391 * bMaxBurst (0~15 allowed, 1~16 packets)
1392 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1393 * sizemax: 1024 * 16 * 3 = 49152
1394 */
1395 if (isopkt[u].length > 49152) {
1396 ret = -EINVAL;
1397 goto error;
1398 }
1399 totlen += isopkt[u].length;
1400 }
1401 u *= sizeof(struct usb_iso_packet_descriptor);
1402 uurb->buffer_length = totlen;
1403 break;
1404
1405 default:
1406 return -EINVAL;
1407 }
1408
1409 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1410 ret = -EINVAL;
1411 goto error;
1412 }
1413 if (uurb->buffer_length > 0 &&
1414 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1415 uurb->buffer, uurb->buffer_length)) {
1416 ret = -EFAULT;
1417 goto error;
1418 }
1419 as = alloc_async(number_of_packets);
1420 if (!as) {
1421 ret = -ENOMEM;
1422 goto error;
1423 }
1424
1425 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1426 num_sgs * sizeof(struct scatterlist);
1427 ret = usbfs_increase_memory_usage(u);
1428 if (ret)
1429 goto error;
1430 as->mem_usage = u;
1431
1432 if (num_sgs) {
1433 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1434 GFP_KERNEL);
1435 if (!as->urb->sg) {
1436 ret = -ENOMEM;
1437 goto error;
1438 }
1439 as->urb->num_sgs = num_sgs;
1440 sg_init_table(as->urb->sg, as->urb->num_sgs);
1441
1442 totlen = uurb->buffer_length;
1443 for (i = 0; i < as->urb->num_sgs; i++) {
1444 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1445 buf = kmalloc(u, GFP_KERNEL);
1446 if (!buf) {
1447 ret = -ENOMEM;
1448 goto error;
1449 }
1450 sg_set_buf(&as->urb->sg[i], buf, u);
1451
1452 if (!is_in) {
1453 if (copy_from_user(buf, uurb->buffer, u)) {
1454 ret = -EFAULT;
1455 goto error;
1456 }
1457 uurb->buffer += u;
1458 }
1459 totlen -= u;
1460 }
1461 } else if (uurb->buffer_length > 0) {
1462 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1463 GFP_KERNEL);
1464 if (!as->urb->transfer_buffer) {
1465 ret = -ENOMEM;
1466 goto error;
1467 }
1468
1469 if (!is_in) {
1470 if (copy_from_user(as->urb->transfer_buffer,
1471 uurb->buffer,
1472 uurb->buffer_length)) {
1473 ret = -EFAULT;
1474 goto error;
1475 }
1476 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1477 /*
1478 * Isochronous input data may end up being
1479 * discontiguous if some of the packets are short.
1480 * Clear the buffer so that the gaps don't leak
1481 * kernel data to userspace.
1482 */
1483 memset(as->urb->transfer_buffer, 0,
1484 uurb->buffer_length);
1485 }
1486 }
1487 as->urb->dev = ps->dev;
1488 as->urb->pipe = (uurb->type << 30) |
1489 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1490 (uurb->endpoint & USB_DIR_IN);
1491
1492 /* This tedious sequence is necessary because the URB_* flags
1493 * are internal to the kernel and subject to change, whereas
1494 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1495 */
1496 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1497 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1498 u |= URB_ISO_ASAP;
1499 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1500 u |= URB_SHORT_NOT_OK;
1501 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1502 u |= URB_NO_FSBR;
1503 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1504 u |= URB_ZERO_PACKET;
1505 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1506 u |= URB_NO_INTERRUPT;
1507 as->urb->transfer_flags = u;
1508
1509 as->urb->transfer_buffer_length = uurb->buffer_length;
1510 as->urb->setup_packet = (unsigned char *)dr;
1511 dr = NULL;
1512 as->urb->start_frame = uurb->start_frame;
1513 as->urb->number_of_packets = number_of_packets;
1514 as->urb->stream_id = stream_id;
1515 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1516 ps->dev->speed == USB_SPEED_HIGH)
1517 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1518 else
1519 as->urb->interval = ep->desc.bInterval;
1520 as->urb->context = as;
1521 as->urb->complete = async_completed;
1522 for (totlen = u = 0; u < number_of_packets; u++) {
1523 as->urb->iso_frame_desc[u].offset = totlen;
1524 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1525 totlen += isopkt[u].length;
1526 }
1527 kfree(isopkt);
1528 isopkt = NULL;
1529 as->ps = ps;
1530 as->userurb = arg;
1531 if (is_in && uurb->buffer_length > 0)
1532 as->userbuffer = uurb->buffer;
1533 else
1534 as->userbuffer = NULL;
1535 as->signr = uurb->signr;
1536 as->ifnum = ifnum;
1537 as->pid = get_pid(task_pid(current));
1538 as->cred = get_current_cred();
1539 security_task_getsecid(current, &as->secid);
1540 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1541 as->urb->transfer_buffer_length, 0, SUBMIT,
1542 NULL, 0);
1543 if (!is_in)
1544 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1545
1546 async_newpending(as);
1547
1548 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1549 spin_lock_irq(&ps->lock);
1550
1551 /* Not exactly the endpoint address; the direction bit is
1552 * shifted to the 0x10 position so that the value will be
1553 * between 0 and 31.
1554 */
1555 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1556 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1557 >> 3);
1558
1559 /* If this bulk URB is the start of a new transfer, re-enable
1560 * the endpoint. Otherwise mark it as a continuation URB.
1561 */
1562 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1563 as->bulk_status = AS_CONTINUATION;
1564 else
1565 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1566
1567 /* Don't accept continuation URBs if the endpoint is
1568 * disabled because of an earlier error.
1569 */
1570 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1571 ret = -EREMOTEIO;
1572 else
1573 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1574 spin_unlock_irq(&ps->lock);
1575 } else {
1576 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1577 }
1578
1579 if (ret) {
1580 dev_printk(KERN_DEBUG, &ps->dev->dev,
1581 "usbfs: usb_submit_urb returned %d\n", ret);
1582 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1583 0, ret, COMPLETE, NULL, 0);
1584 async_removepending(as);
1585 goto error;
1586 }
1587 return 0;
1588
1589 error:
1590 kfree(isopkt);
1591 kfree(dr);
1592 if (as)
1593 free_async(as);
1594 return ret;
1595 }
1596
1597 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1598 {
1599 struct usbdevfs_urb uurb;
1600
1601 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1602 return -EFAULT;
1603
1604 return proc_do_submiturb(ps, &uurb,
1605 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1606 arg);
1607 }
1608
1609 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1610 {
1611 struct urb *urb;
1612 struct async *as;
1613 unsigned long flags;
1614
1615 spin_lock_irqsave(&ps->lock, flags);
1616 as = async_getpending(ps, arg);
1617 if (!as) {
1618 spin_unlock_irqrestore(&ps->lock, flags);
1619 return -EINVAL;
1620 }
1621
1622 urb = as->urb;
1623 usb_get_urb(urb);
1624 spin_unlock_irqrestore(&ps->lock, flags);
1625
1626 usb_kill_urb(urb);
1627 usb_put_urb(urb);
1628
1629 return 0;
1630 }
1631
1632 static int processcompl(struct async *as, void __user * __user *arg)
1633 {
1634 struct urb *urb = as->urb;
1635 struct usbdevfs_urb __user *userurb = as->userurb;
1636 void __user *addr = as->userurb;
1637 unsigned int i;
1638
1639 if (as->userbuffer && urb->actual_length) {
1640 if (copy_urb_data_to_user(as->userbuffer, urb))
1641 goto err_out;
1642 }
1643 if (put_user(as->status, &userurb->status))
1644 goto err_out;
1645 if (put_user(urb->actual_length, &userurb->actual_length))
1646 goto err_out;
1647 if (put_user(urb->error_count, &userurb->error_count))
1648 goto err_out;
1649
1650 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1651 for (i = 0; i < urb->number_of_packets; i++) {
1652 if (put_user(urb->iso_frame_desc[i].actual_length,
1653 &userurb->iso_frame_desc[i].actual_length))
1654 goto err_out;
1655 if (put_user(urb->iso_frame_desc[i].status,
1656 &userurb->iso_frame_desc[i].status))
1657 goto err_out;
1658 }
1659 }
1660
1661 if (put_user(addr, (void __user * __user *)arg))
1662 return -EFAULT;
1663 return 0;
1664
1665 err_out:
1666 return -EFAULT;
1667 }
1668
1669 static struct async *reap_as(struct usb_dev_state *ps)
1670 {
1671 DECLARE_WAITQUEUE(wait, current);
1672 struct async *as = NULL;
1673 struct usb_device *dev = ps->dev;
1674
1675 add_wait_queue(&ps->wait, &wait);
1676 for (;;) {
1677 __set_current_state(TASK_INTERRUPTIBLE);
1678 as = async_getcompleted(ps);
1679 if (as || !connected(ps))
1680 break;
1681 if (signal_pending(current))
1682 break;
1683 usb_unlock_device(dev);
1684 schedule();
1685 usb_lock_device(dev);
1686 }
1687 remove_wait_queue(&ps->wait, &wait);
1688 set_current_state(TASK_RUNNING);
1689 return as;
1690 }
1691
1692 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1693 {
1694 struct async *as = reap_as(ps);
1695
1696 if (as) {
1697 int retval;
1698
1699 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1700 retval = processcompl(as, (void __user * __user *)arg);
1701 free_async(as);
1702 return retval;
1703 }
1704 if (signal_pending(current))
1705 return -EINTR;
1706 return -ENODEV;
1707 }
1708
1709 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1710 {
1711 int retval;
1712 struct async *as;
1713
1714 as = async_getcompleted(ps);
1715 if (as) {
1716 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1717 retval = processcompl(as, (void __user * __user *)arg);
1718 free_async(as);
1719 } else {
1720 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1721 }
1722 return retval;
1723 }
1724
1725 #ifdef CONFIG_COMPAT
1726 static int proc_control_compat(struct usb_dev_state *ps,
1727 struct usbdevfs_ctrltransfer32 __user *p32)
1728 {
1729 struct usbdevfs_ctrltransfer __user *p;
1730 __u32 udata;
1731 p = compat_alloc_user_space(sizeof(*p));
1732 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1733 get_user(udata, &p32->data) ||
1734 put_user(compat_ptr(udata), &p->data))
1735 return -EFAULT;
1736 return proc_control(ps, p);
1737 }
1738
1739 static int proc_bulk_compat(struct usb_dev_state *ps,
1740 struct usbdevfs_bulktransfer32 __user *p32)
1741 {
1742 struct usbdevfs_bulktransfer __user *p;
1743 compat_uint_t n;
1744 compat_caddr_t addr;
1745
1746 p = compat_alloc_user_space(sizeof(*p));
1747
1748 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1749 get_user(n, &p32->len) || put_user(n, &p->len) ||
1750 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1751 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1752 return -EFAULT;
1753
1754 return proc_bulk(ps, p);
1755 }
1756 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1757 {
1758 struct usbdevfs_disconnectsignal32 ds;
1759
1760 if (copy_from_user(&ds, arg, sizeof(ds)))
1761 return -EFAULT;
1762 ps->discsignr = ds.signr;
1763 ps->disccontext = compat_ptr(ds.context);
1764 return 0;
1765 }
1766
1767 static int get_urb32(struct usbdevfs_urb *kurb,
1768 struct usbdevfs_urb32 __user *uurb)
1769 {
1770 __u32 uptr;
1771 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1772 __get_user(kurb->type, &uurb->type) ||
1773 __get_user(kurb->endpoint, &uurb->endpoint) ||
1774 __get_user(kurb->status, &uurb->status) ||
1775 __get_user(kurb->flags, &uurb->flags) ||
1776 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1777 __get_user(kurb->actual_length, &uurb->actual_length) ||
1778 __get_user(kurb->start_frame, &uurb->start_frame) ||
1779 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1780 __get_user(kurb->error_count, &uurb->error_count) ||
1781 __get_user(kurb->signr, &uurb->signr))
1782 return -EFAULT;
1783
1784 if (__get_user(uptr, &uurb->buffer))
1785 return -EFAULT;
1786 kurb->buffer = compat_ptr(uptr);
1787 if (__get_user(uptr, &uurb->usercontext))
1788 return -EFAULT;
1789 kurb->usercontext = compat_ptr(uptr);
1790
1791 return 0;
1792 }
1793
1794 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1795 {
1796 struct usbdevfs_urb uurb;
1797
1798 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1799 return -EFAULT;
1800
1801 return proc_do_submiturb(ps, &uurb,
1802 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1803 arg);
1804 }
1805
1806 static int processcompl_compat(struct async *as, void __user * __user *arg)
1807 {
1808 struct urb *urb = as->urb;
1809 struct usbdevfs_urb32 __user *userurb = as->userurb;
1810 void __user *addr = as->userurb;
1811 unsigned int i;
1812
1813 if (as->userbuffer && urb->actual_length) {
1814 if (copy_urb_data_to_user(as->userbuffer, urb))
1815 return -EFAULT;
1816 }
1817 if (put_user(as->status, &userurb->status))
1818 return -EFAULT;
1819 if (put_user(urb->actual_length, &userurb->actual_length))
1820 return -EFAULT;
1821 if (put_user(urb->error_count, &userurb->error_count))
1822 return -EFAULT;
1823
1824 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1825 for (i = 0; i < urb->number_of_packets; i++) {
1826 if (put_user(urb->iso_frame_desc[i].actual_length,
1827 &userurb->iso_frame_desc[i].actual_length))
1828 return -EFAULT;
1829 if (put_user(urb->iso_frame_desc[i].status,
1830 &userurb->iso_frame_desc[i].status))
1831 return -EFAULT;
1832 }
1833 }
1834
1835 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1836 return -EFAULT;
1837 return 0;
1838 }
1839
1840 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1841 {
1842 struct async *as = reap_as(ps);
1843
1844 if (as) {
1845 int retval;
1846
1847 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1848 retval = processcompl_compat(as, (void __user * __user *)arg);
1849 free_async(as);
1850 return retval;
1851 }
1852 if (signal_pending(current))
1853 return -EINTR;
1854 return -ENODEV;
1855 }
1856
1857 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1858 {
1859 int retval;
1860 struct async *as;
1861
1862 as = async_getcompleted(ps);
1863 if (as) {
1864 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1865 retval = processcompl_compat(as, (void __user * __user *)arg);
1866 free_async(as);
1867 } else {
1868 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1869 }
1870 return retval;
1871 }
1872
1873
1874 #endif
1875
1876 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1877 {
1878 struct usbdevfs_disconnectsignal ds;
1879
1880 if (copy_from_user(&ds, arg, sizeof(ds)))
1881 return -EFAULT;
1882 ps->discsignr = ds.signr;
1883 ps->disccontext = ds.context;
1884 return 0;
1885 }
1886
1887 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1888 {
1889 unsigned int ifnum;
1890
1891 if (get_user(ifnum, (unsigned int __user *)arg))
1892 return -EFAULT;
1893 return claimintf(ps, ifnum);
1894 }
1895
1896 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1897 {
1898 unsigned int ifnum;
1899 int ret;
1900
1901 if (get_user(ifnum, (unsigned int __user *)arg))
1902 return -EFAULT;
1903 ret = releaseintf(ps, ifnum);
1904 if (ret < 0)
1905 return ret;
1906 destroy_async_on_interface (ps, ifnum);
1907 return 0;
1908 }
1909
1910 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1911 {
1912 int size;
1913 void *buf = NULL;
1914 int retval = 0;
1915 struct usb_interface *intf = NULL;
1916 struct usb_driver *driver = NULL;
1917
1918 /* alloc buffer */
1919 size = _IOC_SIZE(ctl->ioctl_code);
1920 if (size > 0) {
1921 buf = kmalloc(size, GFP_KERNEL);
1922 if (buf == NULL)
1923 return -ENOMEM;
1924 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1925 if (copy_from_user(buf, ctl->data, size)) {
1926 kfree(buf);
1927 return -EFAULT;
1928 }
1929 } else {
1930 memset(buf, 0, size);
1931 }
1932 }
1933
1934 if (!connected(ps)) {
1935 kfree(buf);
1936 return -ENODEV;
1937 }
1938
1939 if (ps->dev->state != USB_STATE_CONFIGURED)
1940 retval = -EHOSTUNREACH;
1941 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1942 retval = -EINVAL;
1943 else switch (ctl->ioctl_code) {
1944
1945 /* disconnect kernel driver from interface */
1946 case USBDEVFS_DISCONNECT:
1947 if (intf->dev.driver) {
1948 driver = to_usb_driver(intf->dev.driver);
1949 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1950 usb_driver_release_interface(driver, intf);
1951 } else
1952 retval = -ENODATA;
1953 break;
1954
1955 /* let kernel drivers try to (re)bind to the interface */
1956 case USBDEVFS_CONNECT:
1957 if (!intf->dev.driver)
1958 retval = device_attach(&intf->dev);
1959 else
1960 retval = -EBUSY;
1961 break;
1962
1963 /* talk directly to the interface's driver */
1964 default:
1965 if (intf->dev.driver)
1966 driver = to_usb_driver(intf->dev.driver);
1967 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1968 retval = -ENOTTY;
1969 } else {
1970 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1971 if (retval == -ENOIOCTLCMD)
1972 retval = -ENOTTY;
1973 }
1974 }
1975
1976 /* cleanup and return */
1977 if (retval >= 0
1978 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1979 && size > 0
1980 && copy_to_user(ctl->data, buf, size) != 0)
1981 retval = -EFAULT;
1982
1983 kfree(buf);
1984 return retval;
1985 }
1986
1987 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1988 {
1989 struct usbdevfs_ioctl ctrl;
1990
1991 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1992 return -EFAULT;
1993 return proc_ioctl(ps, &ctrl);
1994 }
1995
1996 #ifdef CONFIG_COMPAT
1997 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
1998 {
1999 struct usbdevfs_ioctl32 __user *uioc;
2000 struct usbdevfs_ioctl ctrl;
2001 u32 udata;
2002
2003 uioc = compat_ptr((long)arg);
2004 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2005 __get_user(ctrl.ifno, &uioc->ifno) ||
2006 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2007 __get_user(udata, &uioc->data))
2008 return -EFAULT;
2009 ctrl.data = compat_ptr(udata);
2010
2011 return proc_ioctl(ps, &ctrl);
2012 }
2013 #endif
2014
2015 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2016 {
2017 unsigned portnum;
2018 int rc;
2019
2020 if (get_user(portnum, (unsigned __user *) arg))
2021 return -EFAULT;
2022 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2023 if (rc == 0)
2024 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2025 portnum, task_pid_nr(current), current->comm);
2026 return rc;
2027 }
2028
2029 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2030 {
2031 unsigned portnum;
2032
2033 if (get_user(portnum, (unsigned __user *) arg))
2034 return -EFAULT;
2035 return usb_hub_release_port(ps->dev, portnum, ps);
2036 }
2037
2038 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2039 {
2040 __u32 caps;
2041
2042 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2043 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2044 if (!ps->dev->bus->no_stop_on_short)
2045 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2046 if (ps->dev->bus->sg_tablesize)
2047 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2048
2049 if (put_user(caps, (__u32 __user *)arg))
2050 return -EFAULT;
2051
2052 return 0;
2053 }
2054
2055 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2056 {
2057 struct usbdevfs_disconnect_claim dc;
2058 struct usb_interface *intf;
2059
2060 if (copy_from_user(&dc, arg, sizeof(dc)))
2061 return -EFAULT;
2062
2063 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2064 if (!intf)
2065 return -EINVAL;
2066
2067 if (intf->dev.driver) {
2068 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2069
2070 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2071 strncmp(dc.driver, intf->dev.driver->name,
2072 sizeof(dc.driver)) != 0)
2073 return -EBUSY;
2074
2075 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2076 strncmp(dc.driver, intf->dev.driver->name,
2077 sizeof(dc.driver)) == 0)
2078 return -EBUSY;
2079
2080 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2081 usb_driver_release_interface(driver, intf);
2082 }
2083
2084 return claimintf(ps, dc.interface);
2085 }
2086
2087 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2088 {
2089 unsigned num_streams, num_eps;
2090 struct usb_host_endpoint **eps;
2091 struct usb_interface *intf;
2092 int r;
2093
2094 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2095 &eps, &intf);
2096 if (r)
2097 return r;
2098
2099 destroy_async_on_interface(ps,
2100 intf->altsetting[0].desc.bInterfaceNumber);
2101
2102 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2103 kfree(eps);
2104 return r;
2105 }
2106
2107 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2108 {
2109 unsigned num_eps;
2110 struct usb_host_endpoint **eps;
2111 struct usb_interface *intf;
2112 int r;
2113
2114 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2115 if (r)
2116 return r;
2117
2118 destroy_async_on_interface(ps,
2119 intf->altsetting[0].desc.bInterfaceNumber);
2120
2121 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2122 kfree(eps);
2123 return r;
2124 }
2125
2126 /*
2127 * NOTE: All requests here that have interface numbers as parameters
2128 * are assuming that somehow the configuration has been prevented from
2129 * changing. But there's no mechanism to ensure that...
2130 */
2131 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2132 void __user *p)
2133 {
2134 struct usb_dev_state *ps = file->private_data;
2135 struct inode *inode = file_inode(file);
2136 struct usb_device *dev = ps->dev;
2137 int ret = -ENOTTY;
2138
2139 if (!(file->f_mode & FMODE_WRITE))
2140 return -EPERM;
2141
2142 usb_lock_device(dev);
2143
2144 /* Reap operations are allowed even after disconnection */
2145 switch (cmd) {
2146 case USBDEVFS_REAPURB:
2147 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2148 ret = proc_reapurb(ps, p);
2149 goto done;
2150
2151 case USBDEVFS_REAPURBNDELAY:
2152 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2153 ret = proc_reapurbnonblock(ps, p);
2154 goto done;
2155
2156 #ifdef CONFIG_COMPAT
2157 case USBDEVFS_REAPURB32:
2158 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2159 ret = proc_reapurb_compat(ps, p);
2160 goto done;
2161
2162 case USBDEVFS_REAPURBNDELAY32:
2163 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2164 ret = proc_reapurbnonblock_compat(ps, p);
2165 goto done;
2166 #endif
2167 }
2168
2169 if (!connected(ps)) {
2170 usb_unlock_device(dev);
2171 return -ENODEV;
2172 }
2173
2174 switch (cmd) {
2175 case USBDEVFS_CONTROL:
2176 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2177 ret = proc_control(ps, p);
2178 if (ret >= 0)
2179 inode->i_mtime = CURRENT_TIME;
2180 break;
2181
2182 case USBDEVFS_BULK:
2183 snoop(&dev->dev, "%s: BULK\n", __func__);
2184 ret = proc_bulk(ps, p);
2185 if (ret >= 0)
2186 inode->i_mtime = CURRENT_TIME;
2187 break;
2188
2189 case USBDEVFS_RESETEP:
2190 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2191 ret = proc_resetep(ps, p);
2192 if (ret >= 0)
2193 inode->i_mtime = CURRENT_TIME;
2194 break;
2195
2196 case USBDEVFS_RESET:
2197 snoop(&dev->dev, "%s: RESET\n", __func__);
2198 ret = proc_resetdevice(ps);
2199 break;
2200
2201 case USBDEVFS_CLEAR_HALT:
2202 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2203 ret = proc_clearhalt(ps, p);
2204 if (ret >= 0)
2205 inode->i_mtime = CURRENT_TIME;
2206 break;
2207
2208 case USBDEVFS_GETDRIVER:
2209 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2210 ret = proc_getdriver(ps, p);
2211 break;
2212
2213 case USBDEVFS_CONNECTINFO:
2214 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2215 ret = proc_connectinfo(ps, p);
2216 break;
2217
2218 case USBDEVFS_SETINTERFACE:
2219 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2220 ret = proc_setintf(ps, p);
2221 break;
2222
2223 case USBDEVFS_SETCONFIGURATION:
2224 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2225 ret = proc_setconfig(ps, p);
2226 break;
2227
2228 case USBDEVFS_SUBMITURB:
2229 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2230 ret = proc_submiturb(ps, p);
2231 if (ret >= 0)
2232 inode->i_mtime = CURRENT_TIME;
2233 break;
2234
2235 #ifdef CONFIG_COMPAT
2236 case USBDEVFS_CONTROL32:
2237 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2238 ret = proc_control_compat(ps, p);
2239 if (ret >= 0)
2240 inode->i_mtime = CURRENT_TIME;
2241 break;
2242
2243 case USBDEVFS_BULK32:
2244 snoop(&dev->dev, "%s: BULK32\n", __func__);
2245 ret = proc_bulk_compat(ps, p);
2246 if (ret >= 0)
2247 inode->i_mtime = CURRENT_TIME;
2248 break;
2249
2250 case USBDEVFS_DISCSIGNAL32:
2251 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2252 ret = proc_disconnectsignal_compat(ps, p);
2253 break;
2254
2255 case USBDEVFS_SUBMITURB32:
2256 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2257 ret = proc_submiturb_compat(ps, p);
2258 if (ret >= 0)
2259 inode->i_mtime = CURRENT_TIME;
2260 break;
2261
2262 case USBDEVFS_IOCTL32:
2263 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2264 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2265 break;
2266 #endif
2267
2268 case USBDEVFS_DISCARDURB:
2269 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2270 ret = proc_unlinkurb(ps, p);
2271 break;
2272
2273 case USBDEVFS_DISCSIGNAL:
2274 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2275 ret = proc_disconnectsignal(ps, p);
2276 break;
2277
2278 case USBDEVFS_CLAIMINTERFACE:
2279 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2280 ret = proc_claiminterface(ps, p);
2281 break;
2282
2283 case USBDEVFS_RELEASEINTERFACE:
2284 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2285 ret = proc_releaseinterface(ps, p);
2286 break;
2287
2288 case USBDEVFS_IOCTL:
2289 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2290 ret = proc_ioctl_default(ps, p);
2291 break;
2292
2293 case USBDEVFS_CLAIM_PORT:
2294 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2295 ret = proc_claim_port(ps, p);
2296 break;
2297
2298 case USBDEVFS_RELEASE_PORT:
2299 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2300 ret = proc_release_port(ps, p);
2301 break;
2302 case USBDEVFS_GET_CAPABILITIES:
2303 ret = proc_get_capabilities(ps, p);
2304 break;
2305 case USBDEVFS_DISCONNECT_CLAIM:
2306 ret = proc_disconnect_claim(ps, p);
2307 break;
2308 case USBDEVFS_ALLOC_STREAMS:
2309 ret = proc_alloc_streams(ps, p);
2310 break;
2311 case USBDEVFS_FREE_STREAMS:
2312 ret = proc_free_streams(ps, p);
2313 break;
2314 }
2315
2316 done:
2317 usb_unlock_device(dev);
2318 if (ret >= 0)
2319 inode->i_atime = CURRENT_TIME;
2320 return ret;
2321 }
2322
2323 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2324 unsigned long arg)
2325 {
2326 int ret;
2327
2328 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2329
2330 return ret;
2331 }
2332
2333 #ifdef CONFIG_COMPAT
2334 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2335 unsigned long arg)
2336 {
2337 int ret;
2338
2339 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2340
2341 return ret;
2342 }
2343 #endif
2344
2345 /* No kernel lock - fine */
2346 static unsigned int usbdev_poll(struct file *file,
2347 struct poll_table_struct *wait)
2348 {
2349 struct usb_dev_state *ps = file->private_data;
2350 unsigned int mask = 0;
2351
2352 poll_wait(file, &ps->wait, wait);
2353 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2354 mask |= POLLOUT | POLLWRNORM;
2355 if (!connected(ps))
2356 mask |= POLLERR | POLLHUP;
2357 return mask;
2358 }
2359
2360 const struct file_operations usbdev_file_operations = {
2361 .owner = THIS_MODULE,
2362 .llseek = no_seek_end_llseek,
2363 .read = usbdev_read,
2364 .poll = usbdev_poll,
2365 .unlocked_ioctl = usbdev_ioctl,
2366 #ifdef CONFIG_COMPAT
2367 .compat_ioctl = usbdev_compat_ioctl,
2368 #endif
2369 .open = usbdev_open,
2370 .release = usbdev_release,
2371 };
2372
2373 static void usbdev_remove(struct usb_device *udev)
2374 {
2375 struct usb_dev_state *ps;
2376 struct siginfo sinfo;
2377
2378 while (!list_empty(&udev->filelist)) {
2379 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2380 destroy_all_async(ps);
2381 wake_up_all(&ps->wait);
2382 list_del_init(&ps->list);
2383 if (ps->discsignr) {
2384 memset(&sinfo, 0, sizeof(sinfo));
2385 sinfo.si_signo = ps->discsignr;
2386 sinfo.si_errno = EPIPE;
2387 sinfo.si_code = SI_ASYNCIO;
2388 sinfo.si_addr = ps->disccontext;
2389 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2390 ps->disc_pid, ps->cred, ps->secid);
2391 }
2392 }
2393 }
2394
2395 static int usbdev_notify(struct notifier_block *self,
2396 unsigned long action, void *dev)
2397 {
2398 switch (action) {
2399 case USB_DEVICE_ADD:
2400 break;
2401 case USB_DEVICE_REMOVE:
2402 usbdev_remove(dev);
2403 break;
2404 }
2405 return NOTIFY_OK;
2406 }
2407
2408 static struct notifier_block usbdev_nb = {
2409 .notifier_call = usbdev_notify,
2410 };
2411
2412 static struct cdev usb_device_cdev;
2413
2414 int __init usb_devio_init(void)
2415 {
2416 int retval;
2417
2418 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2419 "usb_device");
2420 if (retval) {
2421 printk(KERN_ERR "Unable to register minors for usb_device\n");
2422 goto out;
2423 }
2424 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2425 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2426 if (retval) {
2427 printk(KERN_ERR "Unable to get usb_device major %d\n",
2428 USB_DEVICE_MAJOR);
2429 goto error_cdev;
2430 }
2431 usb_register_notify(&usbdev_nb);
2432 out:
2433 return retval;
2434
2435 error_cdev:
2436 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2437 goto out;
2438 }
2439
2440 void usb_devio_cleanup(void)
2441 {
2442 usb_unregister_notify(&usbdev_nb);
2443 cdev_del(&usb_device_cdev);
2444 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2445 }
Linux kernel - Deliverables
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