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dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / usb / core / devio.c
blob5e0af15aebc4a5e354d3bd682fd3691e0ee50507
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 u32 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 atomic64_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(u64 amount)
128 {
129 u64 lim;
130
131 lim = ACCESS_ONCE(usbfs_memory_mb);
132 lim <<= 20;
133
134 atomic64_add(amount, &usbfs_memory_usage);
135
136 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
137 atomic64_sub(amount, &usbfs_memory_usage);
138 return -ENOMEM;
139 }
140
141 return 0;
142 }
143
144 /* Memory for a transfer is being deallocated */
145 static void usbfs_decrease_memory_usage(u64 amount)
146 {
147 atomic64_sub(amount, &usbfs_memory_usage);
148 }
149
150 static int connected(struct usb_dev_state *ps)
151 {
152 return (!list_empty(&ps->list) &&
153 ps->dev->state != USB_STATE_NOTATTACHED);
154 }
155
156 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
157 {
158 loff_t ret;
159
160 mutex_lock(&file_inode(file)->i_mutex);
161
162 switch (orig) {
163 case 0:
164 file->f_pos = offset;
165 ret = file->f_pos;
166 break;
167 case 1:
168 file->f_pos += offset;
169 ret = file->f_pos;
170 break;
171 case 2:
172 default:
173 ret = -EINVAL;
174 }
175
176 mutex_unlock(&file_inode(file)->i_mutex);
177 return ret;
178 }
179
180 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
181 loff_t *ppos)
182 {
183 struct usb_dev_state *ps = file->private_data;
184 struct usb_device *dev = ps->dev;
185 ssize_t ret = 0;
186 unsigned len;
187 loff_t pos;
188 int i;
189
190 pos = *ppos;
191 usb_lock_device(dev);
192 if (!connected(ps)) {
193 ret = -ENODEV;
194 goto err;
195 } else if (pos < 0) {
196 ret = -EINVAL;
197 goto err;
198 }
199
200 if (pos < sizeof(struct usb_device_descriptor)) {
201 /* 18 bytes - fits on the stack */
202 struct usb_device_descriptor temp_desc;
203
204 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
205 le16_to_cpus(&temp_desc.bcdUSB);
206 le16_to_cpus(&temp_desc.idVendor);
207 le16_to_cpus(&temp_desc.idProduct);
208 le16_to_cpus(&temp_desc.bcdDevice);
209
210 len = sizeof(struct usb_device_descriptor) - pos;
211 if (len > nbytes)
212 len = nbytes;
213 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
214 ret = -EFAULT;
215 goto err;
216 }
217
218 *ppos += len;
219 buf += len;
220 nbytes -= len;
221 ret += len;
222 }
223
224 pos = sizeof(struct usb_device_descriptor);
225 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
226 struct usb_config_descriptor *config =
227 (struct usb_config_descriptor *)dev->rawdescriptors[i];
228 unsigned int length = le16_to_cpu(config->wTotalLength);
229
230 if (*ppos < pos + length) {
231
232 /* The descriptor may claim to be longer than it
233 * really is. Here is the actual allocated length. */
234 unsigned alloclen =
235 le16_to_cpu(dev->config[i].desc.wTotalLength);
236
237 len = length - (*ppos - pos);
238 if (len > nbytes)
239 len = nbytes;
240
241 /* Simply don't write (skip over) unallocated parts */
242 if (alloclen > (*ppos - pos)) {
243 alloclen -= (*ppos - pos);
244 if (copy_to_user(buf,
245 dev->rawdescriptors[i] + (*ppos - pos),
246 min(len, alloclen))) {
247 ret = -EFAULT;
248 goto err;
249 }
250 }
251
252 *ppos += len;
253 buf += len;
254 nbytes -= len;
255 ret += len;
256 }
257
258 pos += length;
259 }
260
261 err:
262 usb_unlock_device(dev);
263 return ret;
264 }
265
266 /*
267 * async list handling
268 */
269
270 static struct async *alloc_async(unsigned int numisoframes)
271 {
272 struct async *as;
273
274 as = kzalloc(sizeof(struct async), GFP_KERNEL);
275 if (!as)
276 return NULL;
277 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
278 if (!as->urb) {
279 kfree(as);
280 return NULL;
281 }
282 return as;
283 }
284
285 static void free_async(struct async *as)
286 {
287 int i;
288
289 put_pid(as->pid);
290 if (as->cred)
291 put_cred(as->cred);
292 for (i = 0; i < as->urb->num_sgs; i++) {
293 if (sg_page(&as->urb->sg[i]))
294 kfree(sg_virt(&as->urb->sg[i]));
295 }
296 kfree(as->urb->sg);
297 kfree(as->urb->transfer_buffer);
298 kfree(as->urb->setup_packet);
299 usb_free_urb(as->urb);
300 usbfs_decrease_memory_usage(as->mem_usage);
301 kfree(as);
302 }
303
304 static void async_newpending(struct async *as)
305 {
306 struct usb_dev_state *ps = as->ps;
307 unsigned long flags;
308
309 spin_lock_irqsave(&ps->lock, flags);
310 list_add_tail(&as->asynclist, &ps->async_pending);
311 spin_unlock_irqrestore(&ps->lock, flags);
312 }
313
314 static void async_removepending(struct async *as)
315 {
316 struct usb_dev_state *ps = as->ps;
317 unsigned long flags;
318
319 spin_lock_irqsave(&ps->lock, flags);
320 list_del_init(&as->asynclist);
321 spin_unlock_irqrestore(&ps->lock, flags);
322 }
323
324 static struct async *async_getcompleted(struct usb_dev_state *ps)
325 {
326 unsigned long flags;
327 struct async *as = NULL;
328
329 spin_lock_irqsave(&ps->lock, flags);
330 if (!list_empty(&ps->async_completed)) {
331 as = list_entry(ps->async_completed.next, struct async,
332 asynclist);
333 list_del_init(&as->asynclist);
334 }
335 spin_unlock_irqrestore(&ps->lock, flags);
336 return as;
337 }
338
339 static struct async *async_getpending(struct usb_dev_state *ps,
340 void __user *userurb)
341 {
342 struct async *as;
343
344 list_for_each_entry(as, &ps->async_pending, asynclist)
345 if (as->userurb == userurb) {
346 list_del_init(&as->asynclist);
347 return as;
348 }
349
350 return NULL;
351 }
352
353 static void snoop_urb(struct usb_device *udev,
354 void __user *userurb, int pipe, unsigned length,
355 int timeout_or_status, enum snoop_when when,
356 unsigned char *data, unsigned data_len)
357 {
358 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
359 static const char *dirs[] = {"out", "in"};
360 int ep;
361 const char *t, *d;
362
363 if (!usbfs_snoop)
364 return;
365
366 ep = usb_pipeendpoint(pipe);
367 t = types[usb_pipetype(pipe)];
368 d = dirs[!!usb_pipein(pipe)];
369
370 if (userurb) { /* Async */
371 if (when == SUBMIT)
372 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
373 "length %u\n",
374 userurb, ep, t, d, length);
375 else
376 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
377 "actual_length %u status %d\n",
378 userurb, ep, t, d, length,
379 timeout_or_status);
380 } else {
381 if (when == SUBMIT)
382 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
383 "timeout %d\n",
384 ep, t, d, length, timeout_or_status);
385 else
386 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
387 "status %d\n",
388 ep, t, d, length, timeout_or_status);
389 }
390
391 if (data && data_len > 0) {
392 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
393 data, data_len, 1);
394 }
395 }
396
397 static void snoop_urb_data(struct urb *urb, unsigned len)
398 {
399 int i, size;
400
401 if (!usbfs_snoop)
402 return;
403
404 if (urb->num_sgs == 0) {
405 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
406 urb->transfer_buffer, len, 1);
407 return;
408 }
409
410 for (i = 0; i < urb->num_sgs && len; i++) {
411 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
412 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
413 sg_virt(&urb->sg[i]), size, 1);
414 len -= size;
415 }
416 }
417
418 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
419 {
420 unsigned i, len, size;
421
422 if (urb->number_of_packets > 0) /* Isochronous */
423 len = urb->transfer_buffer_length;
424 else /* Non-Isoc */
425 len = urb->actual_length;
426
427 if (urb->num_sgs == 0) {
428 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
429 return -EFAULT;
430 return 0;
431 }
432
433 for (i = 0; i < urb->num_sgs && len; i++) {
434 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
435 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
436 return -EFAULT;
437 userbuffer += size;
438 len -= size;
439 }
440
441 return 0;
442 }
443
444 #define AS_CONTINUATION 1
445 #define AS_UNLINK 2
446
447 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
448 __releases(ps->lock)
449 __acquires(ps->lock)
450 {
451 struct urb *urb;
452 struct async *as;
453
454 /* Mark all the pending URBs that match bulk_addr, up to but not
455 * including the first one without AS_CONTINUATION. If such an
456 * URB is encountered then a new transfer has already started so
457 * the endpoint doesn't need to be disabled; otherwise it does.
458 */
459 list_for_each_entry(as, &ps->async_pending, asynclist) {
460 if (as->bulk_addr == bulk_addr) {
461 if (as->bulk_status != AS_CONTINUATION)
462 goto rescan;
463 as->bulk_status = AS_UNLINK;
464 as->bulk_addr = 0;
465 }
466 }
467 ps->disabled_bulk_eps |= (1 << bulk_addr);
468
469 /* Now carefully unlink all the marked pending URBs */
470 rescan:
471 list_for_each_entry(as, &ps->async_pending, asynclist) {
472 if (as->bulk_status == AS_UNLINK) {
473 as->bulk_status = 0; /* Only once */
474 urb = as->urb;
475 usb_get_urb(urb);
476 spin_unlock(&ps->lock); /* Allow completions */
477 usb_unlink_urb(urb);
478 usb_put_urb(urb);
479 spin_lock(&ps->lock);
480 goto rescan;
481 }
482 }
483 }
484
485 static void async_completed(struct urb *urb)
486 {
487 struct async *as = urb->context;
488 struct usb_dev_state *ps = as->ps;
489 struct siginfo sinfo;
490 struct pid *pid = NULL;
491 u32 secid = 0;
492 const struct cred *cred = NULL;
493 int signr;
494
495 spin_lock(&ps->lock);
496 list_move_tail(&as->asynclist, &ps->async_completed);
497 as->status = urb->status;
498 signr = as->signr;
499 if (signr) {
500 memset(&sinfo, 0, sizeof(sinfo));
501 sinfo.si_signo = as->signr;
502 sinfo.si_errno = as->status;
503 sinfo.si_code = SI_ASYNCIO;
504 sinfo.si_addr = as->userurb;
505 pid = get_pid(as->pid);
506 cred = get_cred(as->cred);
507 secid = as->secid;
508 }
509 snoop(&urb->dev->dev, "urb complete\n");
510 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
511 as->status, COMPLETE, NULL, 0);
512 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
513 snoop_urb_data(urb, urb->actual_length);
514
515 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
516 as->status != -ENOENT)
517 cancel_bulk_urbs(ps, as->bulk_addr);
518
519 wake_up(&ps->wait);
520 spin_unlock(&ps->lock);
521
522 if (signr) {
523 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
524 put_pid(pid);
525 put_cred(cred);
526 }
527 }
528
529 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
530 {
531 struct urb *urb;
532 struct async *as;
533 unsigned long flags;
534
535 spin_lock_irqsave(&ps->lock, flags);
536 while (!list_empty(list)) {
537 as = list_entry(list->next, struct async, asynclist);
538 list_del_init(&as->asynclist);
539 urb = as->urb;
540 usb_get_urb(urb);
541
542 /* drop the spinlock so the completion handler can run */
543 spin_unlock_irqrestore(&ps->lock, flags);
544 usb_kill_urb(urb);
545 usb_put_urb(urb);
546 spin_lock_irqsave(&ps->lock, flags);
547 }
548 spin_unlock_irqrestore(&ps->lock, flags);
549 }
550
551 static void destroy_async_on_interface(struct usb_dev_state *ps,
552 unsigned int ifnum)
553 {
554 struct list_head *p, *q, hitlist;
555 unsigned long flags;
556
557 INIT_LIST_HEAD(&hitlist);
558 spin_lock_irqsave(&ps->lock, flags);
559 list_for_each_safe(p, q, &ps->async_pending)
560 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
561 list_move_tail(p, &hitlist);
562 spin_unlock_irqrestore(&ps->lock, flags);
563 destroy_async(ps, &hitlist);
564 }
565
566 static void destroy_all_async(struct usb_dev_state *ps)
567 {
568 destroy_async(ps, &ps->async_pending);
569 }
570
571 /*
572 * interface claims are made only at the request of user level code,
573 * which can also release them (explicitly or by closing files).
574 * they're also undone when devices disconnect.
575 */
576
577 static int driver_probe(struct usb_interface *intf,
578 const struct usb_device_id *id)
579 {
580 return -ENODEV;
581 }
582
583 static void driver_disconnect(struct usb_interface *intf)
584 {
585 struct usb_dev_state *ps = usb_get_intfdata(intf);
586 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
587
588 if (!ps)
589 return;
590
591 /* NOTE: this relies on usbcore having canceled and completed
592 * all pending I/O requests; 2.6 does that.
593 */
594
595 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
596 clear_bit(ifnum, &ps->ifclaimed);
597 else
598 dev_warn(&intf->dev, "interface number %u out of range\n",
599 ifnum);
600
601 usb_set_intfdata(intf, NULL);
602
603 /* force async requests to complete */
604 destroy_async_on_interface(ps, ifnum);
605 }
606
607 /* The following routines are merely placeholders. There is no way
608 * to inform a user task about suspend or resumes.
609 */
610 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
611 {
612 return 0;
613 }
614
615 static int driver_resume(struct usb_interface *intf)
616 {
617 return 0;
618 }
619
620 struct usb_driver usbfs_driver = {
621 .name = "usbfs",
622 .probe = driver_probe,
623 .disconnect = driver_disconnect,
624 .suspend = driver_suspend,
625 .resume = driver_resume,
626 };
627
628 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
629 {
630 struct usb_device *dev = ps->dev;
631 struct usb_interface *intf;
632 int err;
633
634 if (ifnum >= 8*sizeof(ps->ifclaimed))
635 return -EINVAL;
636 /* already claimed */
637 if (test_bit(ifnum, &ps->ifclaimed))
638 return 0;
639
640 intf = usb_ifnum_to_if(dev, ifnum);
641 if (!intf)
642 err = -ENOENT;
643 else
644 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
645 if (err == 0)
646 set_bit(ifnum, &ps->ifclaimed);
647 return err;
648 }
649
650 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
651 {
652 struct usb_device *dev;
653 struct usb_interface *intf;
654 int err;
655
656 err = -EINVAL;
657 if (ifnum >= 8*sizeof(ps->ifclaimed))
658 return err;
659 dev = ps->dev;
660 intf = usb_ifnum_to_if(dev, ifnum);
661 if (!intf)
662 err = -ENOENT;
663 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
664 usb_driver_release_interface(&usbfs_driver, intf);
665 err = 0;
666 }
667 return err;
668 }
669
670 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
671 {
672 if (ps->dev->state != USB_STATE_CONFIGURED)
673 return -EHOSTUNREACH;
674 if (ifnum >= 8*sizeof(ps->ifclaimed))
675 return -EINVAL;
676 if (test_bit(ifnum, &ps->ifclaimed))
677 return 0;
678 /* if not yet claimed, claim it for the driver */
679 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
680 "interface %u before use\n", task_pid_nr(current),
681 current->comm, ifnum);
682 return claimintf(ps, ifnum);
683 }
684
685 static int findintfep(struct usb_device *dev, unsigned int ep)
686 {
687 unsigned int i, j, e;
688 struct usb_interface *intf;
689 struct usb_host_interface *alts;
690 struct usb_endpoint_descriptor *endpt;
691
692 if (ep & ~(USB_DIR_IN|0xf))
693 return -EINVAL;
694 if (!dev->actconfig)
695 return -ESRCH;
696 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
697 intf = dev->actconfig->interface[i];
698 for (j = 0; j < intf->num_altsetting; j++) {
699 alts = &intf->altsetting[j];
700 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
701 endpt = &alts->endpoint[e].desc;
702 if (endpt->bEndpointAddress == ep)
703 return alts->desc.bInterfaceNumber;
704 }
705 }
706 }
707 return -ENOENT;
708 }
709
710 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
711 unsigned int request, unsigned int index)
712 {
713 int ret = 0;
714 struct usb_host_interface *alt_setting;
715
716 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
717 && ps->dev->state != USB_STATE_ADDRESS
718 && ps->dev->state != USB_STATE_CONFIGURED)
719 return -EHOSTUNREACH;
720 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
721 return 0;
722
723 /*
724 * check for the special corner case 'get_device_id' in the printer
725 * class specification, which we always want to allow as it is used
726 * to query things like ink level, etc.
727 */
728 if (requesttype == 0xa1 && request == 0) {
729 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
730 index >> 8, index & 0xff);
731 if (alt_setting
732 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
733 return 0;
734 }
735
736 index &= 0xff;
737 switch (requesttype & USB_RECIP_MASK) {
738 case USB_RECIP_ENDPOINT:
739 if ((index & ~USB_DIR_IN) == 0)
740 return 0;
741 ret = findintfep(ps->dev, index);
742 if (ret < 0) {
743 /*
744 * Some not fully compliant Win apps seem to get
745 * index wrong and have the endpoint number here
746 * rather than the endpoint address (with the
747 * correct direction). Win does let this through,
748 * so we'll not reject it here but leave it to
749 * the device to not break KVM. But we warn.
750 */
751 ret = findintfep(ps->dev, index ^ 0x80);
752 if (ret >= 0)
753 dev_info(&ps->dev->dev,
754 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
755 __func__, task_pid_nr(current),
756 current->comm, index, index ^ 0x80);
757 }
758 if (ret >= 0)
759 ret = checkintf(ps, ret);
760 break;
761
762 case USB_RECIP_INTERFACE:
763 ret = checkintf(ps, index);
764 break;
765 }
766 return ret;
767 }
768
769 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
770 unsigned char ep)
771 {
772 if (ep & USB_ENDPOINT_DIR_MASK)
773 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
774 else
775 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
776 }
777
778 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
779 struct usbdevfs_streams __user *streams,
780 unsigned int *num_streams_ret,
781 unsigned int *num_eps_ret,
782 struct usb_host_endpoint ***eps_ret,
783 struct usb_interface **intf_ret)
784 {
785 unsigned int i, num_streams, num_eps;
786 struct usb_host_endpoint **eps;
787 struct usb_interface *intf = NULL;
788 unsigned char ep;
789 int ifnum, ret;
790
791 if (get_user(num_streams, &streams->num_streams) ||
792 get_user(num_eps, &streams->num_eps))
793 return -EFAULT;
794
795 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
796 return -EINVAL;
797
798 /* The XHCI controller allows max 2 ^ 16 streams */
799 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
800 return -EINVAL;
801
802 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
803 if (!eps)
804 return -ENOMEM;
805
806 for (i = 0; i < num_eps; i++) {
807 if (get_user(ep, &streams->eps[i])) {
808 ret = -EFAULT;
809 goto error;
810 }
811 eps[i] = ep_to_host_endpoint(ps->dev, ep);
812 if (!eps[i]) {
813 ret = -EINVAL;
814 goto error;
815 }
816
817 /* usb_alloc/free_streams operate on an usb_interface */
818 ifnum = findintfep(ps->dev, ep);
819 if (ifnum < 0) {
820 ret = ifnum;
821 goto error;
822 }
823
824 if (i == 0) {
825 ret = checkintf(ps, ifnum);
826 if (ret < 0)
827 goto error;
828 intf = usb_ifnum_to_if(ps->dev, ifnum);
829 } else {
830 /* Verify all eps belong to the same interface */
831 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
832 ret = -EINVAL;
833 goto error;
834 }
835 }
836 }
837
838 if (num_streams_ret)
839 *num_streams_ret = num_streams;
840 *num_eps_ret = num_eps;
841 *eps_ret = eps;
842 *intf_ret = intf;
843
844 return 0;
845
846 error:
847 kfree(eps);
848 return ret;
849 }
850
851 static int match_devt(struct device *dev, void *data)
852 {
853 return dev->devt == (dev_t) (unsigned long) data;
854 }
855
856 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
857 {
858 struct device *dev;
859
860 dev = bus_find_device(&usb_bus_type, NULL,
861 (void *) (unsigned long) devt, match_devt);
862 if (!dev)
863 return NULL;
864 return container_of(dev, struct usb_device, dev);
865 }
866
867 /*
868 * file operations
869 */
870 static int usbdev_open(struct inode *inode, struct file *file)
871 {
872 struct usb_device *dev = NULL;
873 struct usb_dev_state *ps;
874 int ret;
875
876 ret = -ENOMEM;
877 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
878 if (!ps)
879 goto out_free_ps;
880
881 ret = -ENODEV;
882
883 /* Protect against simultaneous removal or release */
884 mutex_lock(&usbfs_mutex);
885
886 /* usbdev device-node */
887 if (imajor(inode) == USB_DEVICE_MAJOR)
888 dev = usbdev_lookup_by_devt(inode->i_rdev);
889
890 mutex_unlock(&usbfs_mutex);
891
892 if (!dev)
893 goto out_free_ps;
894
895 usb_lock_device(dev);
896 if (dev->state == USB_STATE_NOTATTACHED)
897 goto out_unlock_device;
898
899 ret = usb_autoresume_device(dev);
900 if (ret)
901 goto out_unlock_device;
902
903 ps->dev = dev;
904 ps->file = file;
905 spin_lock_init(&ps->lock);
906 INIT_LIST_HEAD(&ps->list);
907 INIT_LIST_HEAD(&ps->async_pending);
908 INIT_LIST_HEAD(&ps->async_completed);
909 init_waitqueue_head(&ps->wait);
910 ps->discsignr = 0;
911 ps->disc_pid = get_pid(task_pid(current));
912 ps->cred = get_current_cred();
913 ps->disccontext = NULL;
914 ps->ifclaimed = 0;
915 security_task_getsecid(current, &ps->secid);
916 smp_wmb();
917 list_add_tail(&ps->list, &dev->filelist);
918 file->private_data = ps;
919 usb_unlock_device(dev);
920 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
921 current->comm);
922 return ret;
923
924 out_unlock_device:
925 usb_unlock_device(dev);
926 usb_put_dev(dev);
927 out_free_ps:
928 kfree(ps);
929 return ret;
930 }
931
932 static int usbdev_release(struct inode *inode, struct file *file)
933 {
934 struct usb_dev_state *ps = file->private_data;
935 struct usb_device *dev = ps->dev;
936 unsigned int ifnum;
937 struct async *as;
938
939 usb_lock_device(dev);
940 usb_hub_release_all_ports(dev, ps);
941
942 list_del_init(&ps->list);
943
944 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
945 ifnum++) {
946 if (test_bit(ifnum, &ps->ifclaimed))
947 releaseintf(ps, ifnum);
948 }
949 destroy_all_async(ps);
950 usb_autosuspend_device(dev);
951 usb_unlock_device(dev);
952 usb_put_dev(dev);
953 put_pid(ps->disc_pid);
954 put_cred(ps->cred);
955
956 as = async_getcompleted(ps);
957 while (as) {
958 free_async(as);
959 as = async_getcompleted(ps);
960 }
961 kfree(ps);
962 return 0;
963 }
964
965 static int proc_control(struct usb_dev_state *ps, void __user *arg)
966 {
967 struct usb_device *dev = ps->dev;
968 struct usbdevfs_ctrltransfer ctrl;
969 unsigned int tmo;
970 unsigned char *tbuf;
971 unsigned wLength;
972 int i, pipe, ret;
973
974 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
975 return -EFAULT;
976 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
977 ctrl.wIndex);
978 if (ret)
979 return ret;
980 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
981 if (wLength > PAGE_SIZE)
982 return -EINVAL;
983 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
984 sizeof(struct usb_ctrlrequest));
985 if (ret)
986 return ret;
987 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
988 if (!tbuf) {
989 ret = -ENOMEM;
990 goto done;
991 }
992 tmo = ctrl.timeout;
993 snoop(&dev->dev, "control urb: bRequestType=%02x "
994 "bRequest=%02x wValue=%04x "
995 "wIndex=%04x wLength=%04x\n",
996 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
997 ctrl.wIndex, ctrl.wLength);
998 if (ctrl.bRequestType & 0x80) {
999 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1000 ctrl.wLength)) {
1001 ret = -EINVAL;
1002 goto done;
1003 }
1004 pipe = usb_rcvctrlpipe(dev, 0);
1005 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1006
1007 usb_unlock_device(dev);
1008 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1009 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1010 tbuf, ctrl.wLength, tmo);
1011 usb_lock_device(dev);
1012 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1013 tbuf, max(i, 0));
1014 if ((i > 0) && ctrl.wLength) {
1015 if (copy_to_user(ctrl.data, tbuf, i)) {
1016 ret = -EFAULT;
1017 goto done;
1018 }
1019 }
1020 } else {
1021 if (ctrl.wLength) {
1022 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1023 ret = -EFAULT;
1024 goto done;
1025 }
1026 }
1027 pipe = usb_sndctrlpipe(dev, 0);
1028 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1029 tbuf, ctrl.wLength);
1030
1031 usb_unlock_device(dev);
1032 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1033 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1034 tbuf, ctrl.wLength, tmo);
1035 usb_lock_device(dev);
1036 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1037 }
1038 if (i < 0 && i != -EPIPE) {
1039 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1040 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1041 current->comm, ctrl.bRequestType, ctrl.bRequest,
1042 ctrl.wLength, i);
1043 }
1044 ret = i;
1045 done:
1046 free_page((unsigned long) tbuf);
1047 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1048 sizeof(struct usb_ctrlrequest));
1049 return ret;
1050 }
1051
1052 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1053 {
1054 struct usb_device *dev = ps->dev;
1055 struct usbdevfs_bulktransfer bulk;
1056 unsigned int tmo, len1, pipe;
1057 int len2;
1058 unsigned char *tbuf;
1059 int i, ret;
1060
1061 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1062 return -EFAULT;
1063 ret = findintfep(ps->dev, bulk.ep);
1064 if (ret < 0)
1065 return ret;
1066 ret = checkintf(ps, ret);
1067 if (ret)
1068 return ret;
1069 if (bulk.ep & USB_DIR_IN)
1070 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1071 else
1072 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1073 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1074 return -EINVAL;
1075 len1 = bulk.len;
1076 if (len1 >= (INT_MAX - sizeof(struct urb)))
1077 return -EINVAL;
1078 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1079 if (ret)
1080 return ret;
1081 tbuf = kmalloc(len1, GFP_KERNEL);
1082 if (!tbuf) {
1083 ret = -ENOMEM;
1084 goto done;
1085 }
1086 tmo = bulk.timeout;
1087 if (bulk.ep & 0x80) {
1088 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1089 ret = -EINVAL;
1090 goto done;
1091 }
1092 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1093
1094 usb_unlock_device(dev);
1095 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1096 usb_lock_device(dev);
1097 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1098
1099 if (!i && len2) {
1100 if (copy_to_user(bulk.data, tbuf, len2)) {
1101 ret = -EFAULT;
1102 goto done;
1103 }
1104 }
1105 } else {
1106 if (len1) {
1107 if (copy_from_user(tbuf, bulk.data, len1)) {
1108 ret = -EFAULT;
1109 goto done;
1110 }
1111 }
1112 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1113
1114 usb_unlock_device(dev);
1115 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1116 usb_lock_device(dev);
1117 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1118 }
1119 ret = (i < 0 ? i : len2);
1120 done:
1121 kfree(tbuf);
1122 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1123 return ret;
1124 }
1125
1126 static void check_reset_of_active_ep(struct usb_device *udev,
1127 unsigned int epnum, char *ioctl_name)
1128 {
1129 struct usb_host_endpoint **eps;
1130 struct usb_host_endpoint *ep;
1131
1132 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1133 ep = eps[epnum & 0x0f];
1134 if (ep && !list_empty(&ep->urb_list))
1135 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1136 task_pid_nr(current), current->comm,
1137 ioctl_name, epnum);
1138 }
1139
1140 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1141 {
1142 unsigned int ep;
1143 int ret;
1144
1145 if (get_user(ep, (unsigned int __user *)arg))
1146 return -EFAULT;
1147 ret = findintfep(ps->dev, ep);
1148 if (ret < 0)
1149 return ret;
1150 ret = checkintf(ps, ret);
1151 if (ret)
1152 return ret;
1153 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1154 usb_reset_endpoint(ps->dev, ep);
1155 return 0;
1156 }
1157
1158 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1159 {
1160 unsigned int ep;
1161 int pipe;
1162 int ret;
1163
1164 if (get_user(ep, (unsigned int __user *)arg))
1165 return -EFAULT;
1166 ret = findintfep(ps->dev, ep);
1167 if (ret < 0)
1168 return ret;
1169 ret = checkintf(ps, ret);
1170 if (ret)
1171 return ret;
1172 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1173 if (ep & USB_DIR_IN)
1174 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1175 else
1176 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1177
1178 return usb_clear_halt(ps->dev, pipe);
1179 }
1180
1181 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1182 {
1183 struct usbdevfs_getdriver gd;
1184 struct usb_interface *intf;
1185 int ret;
1186
1187 if (copy_from_user(&gd, arg, sizeof(gd)))
1188 return -EFAULT;
1189 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1190 if (!intf || !intf->dev.driver)
1191 ret = -ENODATA;
1192 else {
1193 strlcpy(gd.driver, intf->dev.driver->name,
1194 sizeof(gd.driver));
1195 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1196 }
1197 return ret;
1198 }
1199
1200 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1201 {
1202 struct usbdevfs_connectinfo ci;
1203
1204 memset(&ci, 0, sizeof(ci));
1205 ci.devnum = ps->dev->devnum;
1206 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1207
1208 if (copy_to_user(arg, &ci, sizeof(ci)))
1209 return -EFAULT;
1210 return 0;
1211 }
1212
1213 static int proc_resetdevice(struct usb_dev_state *ps)
1214 {
1215 return usb_reset_device(ps->dev);
1216 }
1217
1218 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1219 {
1220 struct usbdevfs_setinterface setintf;
1221 int ret;
1222
1223 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1224 return -EFAULT;
1225 ret = checkintf(ps, setintf.interface);
1226 if (ret)
1227 return ret;
1228
1229 destroy_async_on_interface(ps, setintf.interface);
1230
1231 return usb_set_interface(ps->dev, setintf.interface,
1232 setintf.altsetting);
1233 }
1234
1235 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1236 {
1237 int u;
1238 int status = 0;
1239 struct usb_host_config *actconfig;
1240
1241 if (get_user(u, (int __user *)arg))
1242 return -EFAULT;
1243
1244 actconfig = ps->dev->actconfig;
1245
1246 /* Don't touch the device if any interfaces are claimed.
1247 * It could interfere with other drivers' operations, and if
1248 * an interface is claimed by usbfs it could easily deadlock.
1249 */
1250 if (actconfig) {
1251 int i;
1252
1253 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1254 if (usb_interface_claimed(actconfig->interface[i])) {
1255 dev_warn(&ps->dev->dev,
1256 "usbfs: interface %d claimed by %s "
1257 "while '%s' sets config #%d\n",
1258 actconfig->interface[i]
1259 ->cur_altsetting
1260 ->desc.bInterfaceNumber,
1261 actconfig->interface[i]
1262 ->dev.driver->name,
1263 current->comm, u);
1264 status = -EBUSY;
1265 break;
1266 }
1267 }
1268 }
1269
1270 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1271 * so avoid usb_set_configuration()'s kick to sysfs
1272 */
1273 if (status == 0) {
1274 if (actconfig && actconfig->desc.bConfigurationValue == u)
1275 status = usb_reset_configuration(ps->dev);
1276 else
1277 status = usb_set_configuration(ps->dev, u);
1278 }
1279
1280 return status;
1281 }
1282
1283 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1284 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1285 void __user *arg)
1286 {
1287 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1288 struct usb_host_endpoint *ep;
1289 struct async *as = NULL;
1290 struct usb_ctrlrequest *dr = NULL;
1291 unsigned int u, totlen, isofrmlen;
1292 int i, ret, num_sgs = 0, ifnum = -1;
1293 int number_of_packets = 0;
1294 unsigned int stream_id = 0;
1295 void *buf;
1296 bool is_in;
1297 bool allow_short = false;
1298 bool allow_zero = false;
1299 unsigned long mask = 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 /* USBDEVFS_URB_ISO_ASAP is a special case */
1305 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1306 mask |= USBDEVFS_URB_ISO_ASAP;
1307
1308 if (uurb->flags & ~mask)
1309 return -EINVAL;
1310
1311 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1312 return -EINVAL;
1313 if (uurb->buffer_length > 0 && !uurb->buffer)
1314 return -EINVAL;
1315 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1316 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1317 ifnum = findintfep(ps->dev, uurb->endpoint);
1318 if (ifnum < 0)
1319 return ifnum;
1320 ret = checkintf(ps, ifnum);
1321 if (ret)
1322 return ret;
1323 }
1324 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1325 if (!ep)
1326 return -ENOENT;
1327 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1328
1329 u = 0;
1330 switch (uurb->type) {
1331 case USBDEVFS_URB_TYPE_CONTROL:
1332 if (is_in)
1333 allow_short = true;
1334 if (!usb_endpoint_xfer_control(&ep->desc))
1335 return -EINVAL;
1336 /* min 8 byte setup packet */
1337 if (uurb->buffer_length < 8)
1338 return -EINVAL;
1339 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1340 if (!dr)
1341 return -ENOMEM;
1342 if (copy_from_user(dr, uurb->buffer, 8)) {
1343 ret = -EFAULT;
1344 goto error;
1345 }
1346 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1347 ret = -EINVAL;
1348 goto error;
1349 }
1350 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1351 le16_to_cpup(&dr->wIndex));
1352 if (ret)
1353 goto error;
1354 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1355 uurb->buffer += 8;
1356 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1357 is_in = 1;
1358 uurb->endpoint |= USB_DIR_IN;
1359 } else {
1360 is_in = 0;
1361 uurb->endpoint &= ~USB_DIR_IN;
1362 }
1363 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1364 "bRequest=%02x wValue=%04x "
1365 "wIndex=%04x wLength=%04x\n",
1366 dr->bRequestType, dr->bRequest,
1367 __le16_to_cpup(&dr->wValue),
1368 __le16_to_cpup(&dr->wIndex),
1369 __le16_to_cpup(&dr->wLength));
1370 u = sizeof(struct usb_ctrlrequest);
1371 break;
1372
1373 case USBDEVFS_URB_TYPE_BULK:
1374 if (!is_in)
1375 allow_zero = true;
1376 else
1377 allow_short = true;
1378 switch (usb_endpoint_type(&ep->desc)) {
1379 case USB_ENDPOINT_XFER_CONTROL:
1380 case USB_ENDPOINT_XFER_ISOC:
1381 return -EINVAL;
1382 case USB_ENDPOINT_XFER_INT:
1383 /* allow single-shot interrupt transfers */
1384 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1385 goto interrupt_urb;
1386 }
1387 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1388 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1389 num_sgs = 0;
1390 if (ep->streams)
1391 stream_id = uurb->stream_id;
1392 break;
1393
1394 case USBDEVFS_URB_TYPE_INTERRUPT:
1395 if (!usb_endpoint_xfer_int(&ep->desc))
1396 return -EINVAL;
1397 interrupt_urb:
1398 if (!is_in)
1399 allow_zero = true;
1400 else
1401 allow_short = true;
1402 break;
1403
1404 case USBDEVFS_URB_TYPE_ISO:
1405 /* arbitrary limit */
1406 if (uurb->number_of_packets < 1 ||
1407 uurb->number_of_packets > 128)
1408 return -EINVAL;
1409 if (!usb_endpoint_xfer_isoc(&ep->desc))
1410 return -EINVAL;
1411 number_of_packets = uurb->number_of_packets;
1412 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1413 number_of_packets;
1414 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1415 if (!isopkt)
1416 return -ENOMEM;
1417 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1418 ret = -EFAULT;
1419 goto error;
1420 }
1421 for (totlen = u = 0; u < number_of_packets; u++) {
1422 /*
1423 * arbitrary limit need for USB 3.0
1424 * bMaxBurst (0~15 allowed, 1~16 packets)
1425 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1426 * sizemax: 1024 * 16 * 3 = 49152
1427 */
1428 if (isopkt[u].length > 49152) {
1429 ret = -EINVAL;
1430 goto error;
1431 }
1432 totlen += isopkt[u].length;
1433 }
1434 u *= sizeof(struct usb_iso_packet_descriptor);
1435 uurb->buffer_length = totlen;
1436 break;
1437
1438 default:
1439 return -EINVAL;
1440 }
1441
1442 if (uurb->buffer_length > 0 &&
1443 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1444 uurb->buffer, uurb->buffer_length)) {
1445 ret = -EFAULT;
1446 goto error;
1447 }
1448 as = alloc_async(number_of_packets);
1449 if (!as) {
1450 ret = -ENOMEM;
1451 goto error;
1452 }
1453
1454 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1455 num_sgs * sizeof(struct scatterlist);
1456 ret = usbfs_increase_memory_usage(u);
1457 if (ret)
1458 goto error;
1459 as->mem_usage = u;
1460
1461 if (num_sgs) {
1462 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1463 GFP_KERNEL);
1464 if (!as->urb->sg) {
1465 ret = -ENOMEM;
1466 goto error;
1467 }
1468 as->urb->num_sgs = num_sgs;
1469 sg_init_table(as->urb->sg, as->urb->num_sgs);
1470
1471 totlen = uurb->buffer_length;
1472 for (i = 0; i < as->urb->num_sgs; i++) {
1473 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1474 buf = kmalloc(u, GFP_KERNEL);
1475 if (!buf) {
1476 ret = -ENOMEM;
1477 goto error;
1478 }
1479 sg_set_buf(&as->urb->sg[i], buf, u);
1480
1481 if (!is_in) {
1482 if (copy_from_user(buf, uurb->buffer, u)) {
1483 ret = -EFAULT;
1484 goto error;
1485 }
1486 uurb->buffer += u;
1487 }
1488 totlen -= u;
1489 }
1490 } else if (uurb->buffer_length > 0) {
1491 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1492 GFP_KERNEL);
1493 if (!as->urb->transfer_buffer) {
1494 ret = -ENOMEM;
1495 goto error;
1496 }
1497
1498 if (!is_in) {
1499 if (copy_from_user(as->urb->transfer_buffer,
1500 uurb->buffer,
1501 uurb->buffer_length)) {
1502 ret = -EFAULT;
1503 goto error;
1504 }
1505 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1506 /*
1507 * Isochronous input data may end up being
1508 * discontiguous if some of the packets are short.
1509 * Clear the buffer so that the gaps don't leak
1510 * kernel data to userspace.
1511 */
1512 memset(as->urb->transfer_buffer, 0,
1513 uurb->buffer_length);
1514 }
1515 }
1516 as->urb->dev = ps->dev;
1517 as->urb->pipe = (uurb->type << 30) |
1518 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1519 (uurb->endpoint & USB_DIR_IN);
1520
1521 /* This tedious sequence is necessary because the URB_* flags
1522 * are internal to the kernel and subject to change, whereas
1523 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1524 */
1525 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1526 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1527 u |= URB_ISO_ASAP;
1528 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1529 u |= URB_SHORT_NOT_OK;
1530 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1531 u |= URB_NO_FSBR;
1532 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1533 u |= URB_ZERO_PACKET;
1534 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1535 u |= URB_NO_INTERRUPT;
1536 as->urb->transfer_flags = u;
1537
1538 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1539 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1540 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1541 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1542
1543 as->urb->transfer_buffer_length = uurb->buffer_length;
1544 as->urb->setup_packet = (unsigned char *)dr;
1545 dr = NULL;
1546 as->urb->start_frame = uurb->start_frame;
1547 as->urb->number_of_packets = number_of_packets;
1548 as->urb->stream_id = stream_id;
1549
1550 if (ep->desc.bInterval) {
1551 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1552 ps->dev->speed == USB_SPEED_HIGH ||
1553 ps->dev->speed >= USB_SPEED_SUPER)
1554 as->urb->interval = 1 <<
1555 min(15, ep->desc.bInterval - 1);
1556 else
1557 as->urb->interval = ep->desc.bInterval;
1558 }
1559
1560 as->urb->context = as;
1561 as->urb->complete = async_completed;
1562 for (totlen = u = 0; u < number_of_packets; u++) {
1563 as->urb->iso_frame_desc[u].offset = totlen;
1564 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1565 totlen += isopkt[u].length;
1566 }
1567 kfree(isopkt);
1568 isopkt = NULL;
1569 as->ps = ps;
1570 as->userurb = arg;
1571 if (is_in && uurb->buffer_length > 0)
1572 as->userbuffer = uurb->buffer;
1573 else
1574 as->userbuffer = NULL;
1575 as->signr = uurb->signr;
1576 as->ifnum = ifnum;
1577 as->pid = get_pid(task_pid(current));
1578 as->cred = get_current_cred();
1579 security_task_getsecid(current, &as->secid);
1580 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1581 as->urb->transfer_buffer_length, 0, SUBMIT,
1582 NULL, 0);
1583 if (!is_in)
1584 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1585
1586 async_newpending(as);
1587
1588 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1589 spin_lock_irq(&ps->lock);
1590
1591 /* Not exactly the endpoint address; the direction bit is
1592 * shifted to the 0x10 position so that the value will be
1593 * between 0 and 31.
1594 */
1595 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1596 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1597 >> 3);
1598
1599 /* If this bulk URB is the start of a new transfer, re-enable
1600 * the endpoint. Otherwise mark it as a continuation URB.
1601 */
1602 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1603 as->bulk_status = AS_CONTINUATION;
1604 else
1605 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1606
1607 /* Don't accept continuation URBs if the endpoint is
1608 * disabled because of an earlier error.
1609 */
1610 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1611 ret = -EREMOTEIO;
1612 else
1613 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1614 spin_unlock_irq(&ps->lock);
1615 } else {
1616 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1617 }
1618
1619 if (ret) {
1620 dev_printk(KERN_DEBUG, &ps->dev->dev,
1621 "usbfs: usb_submit_urb returned %d\n", ret);
1622 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1623 0, ret, COMPLETE, NULL, 0);
1624 async_removepending(as);
1625 goto error;
1626 }
1627 return 0;
1628
1629 error:
1630 kfree(isopkt);
1631 kfree(dr);
1632 if (as)
1633 free_async(as);
1634 return ret;
1635 }
1636
1637 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1638 {
1639 struct usbdevfs_urb uurb;
1640
1641 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1642 return -EFAULT;
1643
1644 return proc_do_submiturb(ps, &uurb,
1645 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1646 arg);
1647 }
1648
1649 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1650 {
1651 struct urb *urb;
1652 struct async *as;
1653 unsigned long flags;
1654
1655 spin_lock_irqsave(&ps->lock, flags);
1656 as = async_getpending(ps, arg);
1657 if (!as) {
1658 spin_unlock_irqrestore(&ps->lock, flags);
1659 return -EINVAL;
1660 }
1661
1662 urb = as->urb;
1663 usb_get_urb(urb);
1664 spin_unlock_irqrestore(&ps->lock, flags);
1665
1666 usb_kill_urb(urb);
1667 usb_put_urb(urb);
1668
1669 return 0;
1670 }
1671
1672 static void compute_isochronous_actual_length(struct urb *urb)
1673 {
1674 unsigned int i;
1675
1676 if (urb->number_of_packets > 0) {
1677 urb->actual_length = 0;
1678 for (i = 0; i < urb->number_of_packets; i++)
1679 urb->actual_length +=
1680 urb->iso_frame_desc[i].actual_length;
1681 }
1682 }
1683
1684 static int processcompl(struct async *as, void __user * __user *arg)
1685 {
1686 struct urb *urb = as->urb;
1687 struct usbdevfs_urb __user *userurb = as->userurb;
1688 void __user *addr = as->userurb;
1689 unsigned int i;
1690
1691 compute_isochronous_actual_length(urb);
1692 if (as->userbuffer && urb->actual_length) {
1693 if (copy_urb_data_to_user(as->userbuffer, urb))
1694 goto err_out;
1695 }
1696 if (put_user(as->status, &userurb->status))
1697 goto err_out;
1698 if (put_user(urb->actual_length, &userurb->actual_length))
1699 goto err_out;
1700 if (put_user(urb->error_count, &userurb->error_count))
1701 goto err_out;
1702
1703 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1704 for (i = 0; i < urb->number_of_packets; i++) {
1705 if (put_user(urb->iso_frame_desc[i].actual_length,
1706 &userurb->iso_frame_desc[i].actual_length))
1707 goto err_out;
1708 if (put_user(urb->iso_frame_desc[i].status,
1709 &userurb->iso_frame_desc[i].status))
1710 goto err_out;
1711 }
1712 }
1713
1714 if (put_user(addr, (void __user * __user *)arg))
1715 return -EFAULT;
1716 return 0;
1717
1718 err_out:
1719 return -EFAULT;
1720 }
1721
1722 static struct async *reap_as(struct usb_dev_state *ps)
1723 {
1724 DECLARE_WAITQUEUE(wait, current);
1725 struct async *as = NULL;
1726 struct usb_device *dev = ps->dev;
1727
1728 add_wait_queue(&ps->wait, &wait);
1729 for (;;) {
1730 __set_current_state(TASK_INTERRUPTIBLE);
1731 as = async_getcompleted(ps);
1732 if (as || !connected(ps))
1733 break;
1734 if (signal_pending(current))
1735 break;
1736 usb_unlock_device(dev);
1737 schedule();
1738 usb_lock_device(dev);
1739 }
1740 remove_wait_queue(&ps->wait, &wait);
1741 set_current_state(TASK_RUNNING);
1742 return as;
1743 }
1744
1745 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1746 {
1747 struct async *as = reap_as(ps);
1748 if (as) {
1749 int retval = processcompl(as, (void __user * __user *)arg);
1750 free_async(as);
1751 return retval;
1752 }
1753 if (signal_pending(current))
1754 return -EINTR;
1755 return -ENODEV;
1756 }
1757
1758 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1759 {
1760 int retval;
1761 struct async *as;
1762
1763 as = async_getcompleted(ps);
1764 if (as) {
1765 retval = processcompl(as, (void __user * __user *)arg);
1766 free_async(as);
1767 } else {
1768 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1769 }
1770 return retval;
1771 }
1772
1773 #ifdef CONFIG_COMPAT
1774 static int proc_control_compat(struct usb_dev_state *ps,
1775 struct usbdevfs_ctrltransfer32 __user *p32)
1776 {
1777 struct usbdevfs_ctrltransfer __user *p;
1778 __u32 udata;
1779 p = compat_alloc_user_space(sizeof(*p));
1780 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1781 get_user(udata, &p32->data) ||
1782 put_user(compat_ptr(udata), &p->data))
1783 return -EFAULT;
1784 return proc_control(ps, p);
1785 }
1786
1787 static int proc_bulk_compat(struct usb_dev_state *ps,
1788 struct usbdevfs_bulktransfer32 __user *p32)
1789 {
1790 struct usbdevfs_bulktransfer __user *p;
1791 compat_uint_t n;
1792 compat_caddr_t addr;
1793
1794 p = compat_alloc_user_space(sizeof(*p));
1795
1796 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1797 get_user(n, &p32->len) || put_user(n, &p->len) ||
1798 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1799 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1800 return -EFAULT;
1801
1802 return proc_bulk(ps, p);
1803 }
1804 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1805 {
1806 struct usbdevfs_disconnectsignal32 ds;
1807
1808 if (copy_from_user(&ds, arg, sizeof(ds)))
1809 return -EFAULT;
1810 ps->discsignr = ds.signr;
1811 ps->disccontext = compat_ptr(ds.context);
1812 return 0;
1813 }
1814
1815 static int get_urb32(struct usbdevfs_urb *kurb,
1816 struct usbdevfs_urb32 __user *uurb)
1817 {
1818 __u32 uptr;
1819 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1820 __get_user(kurb->type, &uurb->type) ||
1821 __get_user(kurb->endpoint, &uurb->endpoint) ||
1822 __get_user(kurb->status, &uurb->status) ||
1823 __get_user(kurb->flags, &uurb->flags) ||
1824 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1825 __get_user(kurb->actual_length, &uurb->actual_length) ||
1826 __get_user(kurb->start_frame, &uurb->start_frame) ||
1827 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1828 __get_user(kurb->error_count, &uurb->error_count) ||
1829 __get_user(kurb->signr, &uurb->signr))
1830 return -EFAULT;
1831
1832 if (__get_user(uptr, &uurb->buffer))
1833 return -EFAULT;
1834 kurb->buffer = compat_ptr(uptr);
1835 if (__get_user(uptr, &uurb->usercontext))
1836 return -EFAULT;
1837 kurb->usercontext = compat_ptr(uptr);
1838
1839 return 0;
1840 }
1841
1842 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1843 {
1844 struct usbdevfs_urb uurb;
1845
1846 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1847 return -EFAULT;
1848
1849 return proc_do_submiturb(ps, &uurb,
1850 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1851 arg);
1852 }
1853
1854 static int processcompl_compat(struct async *as, void __user * __user *arg)
1855 {
1856 struct urb *urb = as->urb;
1857 struct usbdevfs_urb32 __user *userurb = as->userurb;
1858 void __user *addr = as->userurb;
1859 unsigned int i;
1860
1861 compute_isochronous_actual_length(urb);
1862 if (as->userbuffer && urb->actual_length) {
1863 if (copy_urb_data_to_user(as->userbuffer, urb))
1864 return -EFAULT;
1865 }
1866 if (put_user(as->status, &userurb->status))
1867 return -EFAULT;
1868 if (put_user(urb->actual_length, &userurb->actual_length))
1869 return -EFAULT;
1870 if (put_user(urb->error_count, &userurb->error_count))
1871 return -EFAULT;
1872
1873 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1874 for (i = 0; i < urb->number_of_packets; i++) {
1875 if (put_user(urb->iso_frame_desc[i].actual_length,
1876 &userurb->iso_frame_desc[i].actual_length))
1877 return -EFAULT;
1878 if (put_user(urb->iso_frame_desc[i].status,
1879 &userurb->iso_frame_desc[i].status))
1880 return -EFAULT;
1881 }
1882 }
1883
1884 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1885 return -EFAULT;
1886 return 0;
1887 }
1888
1889 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1890 {
1891 struct async *as = reap_as(ps);
1892 if (as) {
1893 int retval = processcompl_compat(as, (void __user * __user *)arg);
1894 free_async(as);
1895 return retval;
1896 }
1897 if (signal_pending(current))
1898 return -EINTR;
1899 return -ENODEV;
1900 }
1901
1902 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1903 {
1904 int retval;
1905 struct async *as;
1906
1907 as = async_getcompleted(ps);
1908 if (as) {
1909 retval = processcompl_compat(as, (void __user * __user *)arg);
1910 free_async(as);
1911 } else {
1912 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1913 }
1914 return retval;
1915 }
1916
1917
1918 #endif
1919
1920 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1921 {
1922 struct usbdevfs_disconnectsignal ds;
1923
1924 if (copy_from_user(&ds, arg, sizeof(ds)))
1925 return -EFAULT;
1926 ps->discsignr = ds.signr;
1927 ps->disccontext = ds.context;
1928 return 0;
1929 }
1930
1931 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1932 {
1933 unsigned int ifnum;
1934
1935 if (get_user(ifnum, (unsigned int __user *)arg))
1936 return -EFAULT;
1937 return claimintf(ps, ifnum);
1938 }
1939
1940 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1941 {
1942 unsigned int ifnum;
1943 int ret;
1944
1945 if (get_user(ifnum, (unsigned int __user *)arg))
1946 return -EFAULT;
1947 ret = releaseintf(ps, ifnum);
1948 if (ret < 0)
1949 return ret;
1950 destroy_async_on_interface (ps, ifnum);
1951 return 0;
1952 }
1953
1954 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1955 {
1956 int size;
1957 void *buf = NULL;
1958 int retval = 0;
1959 struct usb_interface *intf = NULL;
1960 struct usb_driver *driver = NULL;
1961
1962 /* alloc buffer */
1963 size = _IOC_SIZE(ctl->ioctl_code);
1964 if (size > 0) {
1965 buf = kmalloc(size, GFP_KERNEL);
1966 if (buf == NULL)
1967 return -ENOMEM;
1968 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1969 if (copy_from_user(buf, ctl->data, size)) {
1970 kfree(buf);
1971 return -EFAULT;
1972 }
1973 } else {
1974 memset(buf, 0, size);
1975 }
1976 }
1977
1978 if (!connected(ps)) {
1979 kfree(buf);
1980 return -ENODEV;
1981 }
1982
1983 if (ps->dev->state != USB_STATE_CONFIGURED)
1984 retval = -EHOSTUNREACH;
1985 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1986 retval = -EINVAL;
1987 else switch (ctl->ioctl_code) {
1988
1989 /* disconnect kernel driver from interface */
1990 case USBDEVFS_DISCONNECT:
1991 if (intf->dev.driver) {
1992 driver = to_usb_driver(intf->dev.driver);
1993 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1994 usb_driver_release_interface(driver, intf);
1995 } else
1996 retval = -ENODATA;
1997 break;
1998
1999 /* let kernel drivers try to (re)bind to the interface */
2000 case USBDEVFS_CONNECT:
2001 if (!intf->dev.driver)
2002 retval = device_attach(&intf->dev);
2003 else
2004 retval = -EBUSY;
2005 break;
2006
2007 /* talk directly to the interface's driver */
2008 default:
2009 if (intf->dev.driver)
2010 driver = to_usb_driver(intf->dev.driver);
2011 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2012 retval = -ENOTTY;
2013 } else {
2014 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2015 if (retval == -ENOIOCTLCMD)
2016 retval = -ENOTTY;
2017 }
2018 }
2019
2020 /* cleanup and return */
2021 if (retval >= 0
2022 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2023 && size > 0
2024 && copy_to_user(ctl->data, buf, size) != 0)
2025 retval = -EFAULT;
2026
2027 kfree(buf);
2028 return retval;
2029 }
2030
2031 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2032 {
2033 struct usbdevfs_ioctl ctrl;
2034
2035 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2036 return -EFAULT;
2037 return proc_ioctl(ps, &ctrl);
2038 }
2039
2040 #ifdef CONFIG_COMPAT
2041 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2042 {
2043 struct usbdevfs_ioctl32 __user *uioc;
2044 struct usbdevfs_ioctl ctrl;
2045 u32 udata;
2046
2047 uioc = compat_ptr((long)arg);
2048 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2049 __get_user(ctrl.ifno, &uioc->ifno) ||
2050 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2051 __get_user(udata, &uioc->data))
2052 return -EFAULT;
2053 ctrl.data = compat_ptr(udata);
2054
2055 return proc_ioctl(ps, &ctrl);
2056 }
2057 #endif
2058
2059 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2060 {
2061 unsigned portnum;
2062 int rc;
2063
2064 if (get_user(portnum, (unsigned __user *) arg))
2065 return -EFAULT;
2066 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2067 if (rc == 0)
2068 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2069 portnum, task_pid_nr(current), current->comm);
2070 return rc;
2071 }
2072
2073 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2074 {
2075 unsigned portnum;
2076
2077 if (get_user(portnum, (unsigned __user *) arg))
2078 return -EFAULT;
2079 return usb_hub_release_port(ps->dev, portnum, ps);
2080 }
2081
2082 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2083 {
2084 __u32 caps;
2085
2086 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2087 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2088 if (!ps->dev->bus->no_stop_on_short)
2089 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2090 if (ps->dev->bus->sg_tablesize)
2091 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2092
2093 if (put_user(caps, (__u32 __user *)arg))
2094 return -EFAULT;
2095
2096 return 0;
2097 }
2098
2099 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2100 {
2101 struct usbdevfs_disconnect_claim dc;
2102 struct usb_interface *intf;
2103
2104 if (copy_from_user(&dc, arg, sizeof(dc)))
2105 return -EFAULT;
2106
2107 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2108 if (!intf)
2109 return -EINVAL;
2110
2111 if (intf->dev.driver) {
2112 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2113
2114 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2115 strncmp(dc.driver, intf->dev.driver->name,
2116 sizeof(dc.driver)) != 0)
2117 return -EBUSY;
2118
2119 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2120 strncmp(dc.driver, intf->dev.driver->name,
2121 sizeof(dc.driver)) == 0)
2122 return -EBUSY;
2123
2124 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2125 usb_driver_release_interface(driver, intf);
2126 }
2127
2128 return claimintf(ps, dc.interface);
2129 }
2130
2131 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2132 {
2133 unsigned num_streams, num_eps;
2134 struct usb_host_endpoint **eps;
2135 struct usb_interface *intf;
2136 int r;
2137
2138 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2139 &eps, &intf);
2140 if (r)
2141 return r;
2142
2143 destroy_async_on_interface(ps,
2144 intf->altsetting[0].desc.bInterfaceNumber);
2145
2146 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2147 kfree(eps);
2148 return r;
2149 }
2150
2151 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2152 {
2153 unsigned num_eps;
2154 struct usb_host_endpoint **eps;
2155 struct usb_interface *intf;
2156 int r;
2157
2158 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2159 if (r)
2160 return r;
2161
2162 destroy_async_on_interface(ps,
2163 intf->altsetting[0].desc.bInterfaceNumber);
2164
2165 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2166 kfree(eps);
2167 return r;
2168 }
2169
2170 /*
2171 * NOTE: All requests here that have interface numbers as parameters
2172 * are assuming that somehow the configuration has been prevented from
2173 * changing. But there's no mechanism to ensure that...
2174 */
2175 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2176 void __user *p)
2177 {
2178 struct usb_dev_state *ps = file->private_data;
2179 struct inode *inode = file_inode(file);
2180 struct usb_device *dev = ps->dev;
2181 int ret = -ENOTTY;
2182
2183 if (!(file->f_mode & FMODE_WRITE))
2184 return -EPERM;
2185
2186 usb_lock_device(dev);
2187
2188 /* Reap operations are allowed even after disconnection */
2189 switch (cmd) {
2190 case USBDEVFS_REAPURB:
2191 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2192 ret = proc_reapurb(ps, p);
2193 goto done;
2194
2195 case USBDEVFS_REAPURBNDELAY:
2196 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2197 ret = proc_reapurbnonblock(ps, p);
2198 goto done;
2199
2200 #ifdef CONFIG_COMPAT
2201 case USBDEVFS_REAPURB32:
2202 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2203 ret = proc_reapurb_compat(ps, p);
2204 goto done;
2205
2206 case USBDEVFS_REAPURBNDELAY32:
2207 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2208 ret = proc_reapurbnonblock_compat(ps, p);
2209 goto done;
2210 #endif
2211 }
2212
2213 if (!connected(ps)) {
2214 usb_unlock_device(dev);
2215 return -ENODEV;
2216 }
2217
2218 switch (cmd) {
2219 case USBDEVFS_CONTROL:
2220 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2221 ret = proc_control(ps, p);
2222 if (ret >= 0)
2223 inode->i_mtime = CURRENT_TIME;
2224 break;
2225
2226 case USBDEVFS_BULK:
2227 snoop(&dev->dev, "%s: BULK\n", __func__);
2228 ret = proc_bulk(ps, p);
2229 if (ret >= 0)
2230 inode->i_mtime = CURRENT_TIME;
2231 break;
2232
2233 case USBDEVFS_RESETEP:
2234 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2235 ret = proc_resetep(ps, p);
2236 if (ret >= 0)
2237 inode->i_mtime = CURRENT_TIME;
2238 break;
2239
2240 case USBDEVFS_RESET:
2241 snoop(&dev->dev, "%s: RESET\n", __func__);
2242 ret = proc_resetdevice(ps);
2243 break;
2244
2245 case USBDEVFS_CLEAR_HALT:
2246 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2247 ret = proc_clearhalt(ps, p);
2248 if (ret >= 0)
2249 inode->i_mtime = CURRENT_TIME;
2250 break;
2251
2252 case USBDEVFS_GETDRIVER:
2253 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2254 ret = proc_getdriver(ps, p);
2255 break;
2256
2257 case USBDEVFS_CONNECTINFO:
2258 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2259 ret = proc_connectinfo(ps, p);
2260 break;
2261
2262 case USBDEVFS_SETINTERFACE:
2263 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2264 ret = proc_setintf(ps, p);
2265 break;
2266
2267 case USBDEVFS_SETCONFIGURATION:
2268 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2269 ret = proc_setconfig(ps, p);
2270 break;
2271
2272 case USBDEVFS_SUBMITURB:
2273 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2274 ret = proc_submiturb(ps, p);
2275 if (ret >= 0)
2276 inode->i_mtime = CURRENT_TIME;
2277 break;
2278
2279 #ifdef CONFIG_COMPAT
2280 case USBDEVFS_CONTROL32:
2281 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2282 ret = proc_control_compat(ps, p);
2283 if (ret >= 0)
2284 inode->i_mtime = CURRENT_TIME;
2285 break;
2286
2287 case USBDEVFS_BULK32:
2288 snoop(&dev->dev, "%s: BULK32\n", __func__);
2289 ret = proc_bulk_compat(ps, p);
2290 if (ret >= 0)
2291 inode->i_mtime = CURRENT_TIME;
2292 break;
2293
2294 case USBDEVFS_DISCSIGNAL32:
2295 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2296 ret = proc_disconnectsignal_compat(ps, p);
2297 break;
2298
2299 case USBDEVFS_SUBMITURB32:
2300 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2301 ret = proc_submiturb_compat(ps, p);
2302 if (ret >= 0)
2303 inode->i_mtime = CURRENT_TIME;
2304 break;
2305
2306 case USBDEVFS_IOCTL32:
2307 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2308 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2309 break;
2310 #endif
2311
2312 case USBDEVFS_DISCARDURB:
2313 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2314 ret = proc_unlinkurb(ps, p);
2315 break;
2316
2317 case USBDEVFS_DISCSIGNAL:
2318 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2319 ret = proc_disconnectsignal(ps, p);
2320 break;
2321
2322 case USBDEVFS_CLAIMINTERFACE:
2323 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2324 ret = proc_claiminterface(ps, p);
2325 break;
2326
2327 case USBDEVFS_RELEASEINTERFACE:
2328 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2329 ret = proc_releaseinterface(ps, p);
2330 break;
2331
2332 case USBDEVFS_IOCTL:
2333 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2334 ret = proc_ioctl_default(ps, p);
2335 break;
2336
2337 case USBDEVFS_CLAIM_PORT:
2338 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2339 ret = proc_claim_port(ps, p);
2340 break;
2341
2342 case USBDEVFS_RELEASE_PORT:
2343 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2344 ret = proc_release_port(ps, p);
2345 break;
2346 case USBDEVFS_GET_CAPABILITIES:
2347 ret = proc_get_capabilities(ps, p);
2348 break;
2349 case USBDEVFS_DISCONNECT_CLAIM:
2350 ret = proc_disconnect_claim(ps, p);
2351 break;
2352 case USBDEVFS_ALLOC_STREAMS:
2353 ret = proc_alloc_streams(ps, p);
2354 break;
2355 case USBDEVFS_FREE_STREAMS:
2356 ret = proc_free_streams(ps, p);
2357 break;
2358 }
2359
2360 done:
2361 usb_unlock_device(dev);
2362 if (ret >= 0)
2363 inode->i_atime = CURRENT_TIME;
2364 return ret;
2365 }
2366
2367 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2368 unsigned long arg)
2369 {
2370 int ret;
2371
2372 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2373
2374 return ret;
2375 }
2376
2377 #ifdef CONFIG_COMPAT
2378 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2379 unsigned long arg)
2380 {
2381 int ret;
2382
2383 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2384
2385 return ret;
2386 }
2387 #endif
2388
2389 /* No kernel lock - fine */
2390 static unsigned int usbdev_poll(struct file *file,
2391 struct poll_table_struct *wait)
2392 {
2393 struct usb_dev_state *ps = file->private_data;
2394 unsigned int mask = 0;
2395
2396 poll_wait(file, &ps->wait, wait);
2397 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2398 mask |= POLLOUT | POLLWRNORM;
2399 if (!connected(ps))
2400 mask |= POLLERR | POLLHUP;
2401 return mask;
2402 }
2403
2404 const struct file_operations usbdev_file_operations = {
2405 .owner = THIS_MODULE,
2406 .llseek = usbdev_lseek,
2407 .read = usbdev_read,
2408 .poll = usbdev_poll,
2409 .unlocked_ioctl = usbdev_ioctl,
2410 #ifdef CONFIG_COMPAT
2411 .compat_ioctl = usbdev_compat_ioctl,
2412 #endif
2413 .open = usbdev_open,
2414 .release = usbdev_release,
2415 };
2416
2417 static void usbdev_remove(struct usb_device *udev)
2418 {
2419 struct usb_dev_state *ps;
2420 struct siginfo sinfo;
2421
2422 while (!list_empty(&udev->filelist)) {
2423 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2424 destroy_all_async(ps);
2425 wake_up_all(&ps->wait);
2426 list_del_init(&ps->list);
2427 if (ps->discsignr) {
2428 memset(&sinfo, 0, sizeof(sinfo));
2429 sinfo.si_signo = ps->discsignr;
2430 sinfo.si_errno = EPIPE;
2431 sinfo.si_code = SI_ASYNCIO;
2432 sinfo.si_addr = ps->disccontext;
2433 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2434 ps->disc_pid, ps->cred, ps->secid);
2435 }
2436 }
2437 }
2438
2439 static int usbdev_notify(struct notifier_block *self,
2440 unsigned long action, void *dev)
2441 {
2442 switch (action) {
2443 case USB_DEVICE_ADD:
2444 break;
2445 case USB_DEVICE_REMOVE:
2446 usbdev_remove(dev);
2447 break;
2448 }
2449 return NOTIFY_OK;
2450 }
2451
2452 static struct notifier_block usbdev_nb = {
2453 .notifier_call = usbdev_notify,
2454 };
2455
2456 static struct cdev usb_device_cdev;
2457
2458 int __init usb_devio_init(void)
2459 {
2460 int retval;
2461
2462 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2463 "usb_device");
2464 if (retval) {
2465 printk(KERN_ERR "Unable to register minors for usb_device\n");
2466 goto out;
2467 }
2468 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2469 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2470 if (retval) {
2471 printk(KERN_ERR "Unable to get usb_device major %d\n",
2472 USB_DEVICE_MAJOR);
2473 goto error_cdev;
2474 }
2475 usb_register_notify(&usbdev_nb);
2476 out:
2477 return retval;
2478
2479 error_cdev:
2480 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2481 goto out;
2482 }
2483
2484 void usb_devio_cleanup(void)
2485 {
2486 usb_unregister_notify(&usbdev_nb);
2487 cdev_del(&usb_device_cdev);
2488 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2489 }
Linux with added FPC-III support