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[thirdparty/linux.git] / drivers / usb / core / devio.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3
4 /*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22 /*****************************************************************************/
23
24 #include <linux/fs.h>
25 #include <linux/mm.h>
26 #include <linux/sched/signal.h>
27 #include <linux/slab.h>
28 #include <linux/signal.h>
29 #include <linux/poll.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/usb.h>
33 #include <linux/usbdevice_fs.h>
34 #include <linux/usb/hcd.h> /* for usbcore internals */
35 #include <linux/cdev.h>
36 #include <linux/notifier.h>
37 #include <linux/security.h>
38 #include <linux/user_namespace.h>
39 #include <linux/scatterlist.h>
40 #include <linux/uaccess.h>
41 #include <linux/dma-mapping.h>
42 #include <asm/byteorder.h>
43 #include <linux/moduleparam.h>
44
45 #include "usb.h"
46
47 #ifdef CONFIG_PM
48 #define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
49 #else
50 #define MAYBE_CAP_SUSPEND 0
51 #endif
52
53 #define USB_MAXBUS 64
54 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
55 #define USB_SG_SIZE 16384 /* split-size for large txs */
56
57 /* Mutual exclusion for ps->list in resume vs. release and remove */
58 static DEFINE_MUTEX(usbfs_mutex);
59
60 struct usb_dev_state {
61 struct list_head list; /* state list */
62 struct usb_device *dev;
63 struct file *file;
64 spinlock_t lock; /* protects the async urb lists */
65 struct list_head async_pending;
66 struct list_head async_completed;
67 struct list_head memory_list;
68 wait_queue_head_t wait; /* wake up if a request completed */
69 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 const struct cred *cred;
73 sigval_t disccontext;
74 unsigned long ifclaimed;
75 u32 disabled_bulk_eps;
76 unsigned long interface_allowed_mask;
77 int not_yet_resumed;
78 bool suspend_allowed;
79 bool privileges_dropped;
80 };
81
82 struct usb_memory {
83 struct list_head memlist;
84 int vma_use_count;
85 int urb_use_count;
86 u32 size;
87 void *mem;
88 dma_addr_t dma_handle;
89 unsigned long vm_start;
90 struct usb_dev_state *ps;
91 };
92
93 struct async {
94 struct list_head asynclist;
95 struct usb_dev_state *ps;
96 struct pid *pid;
97 const struct cred *cred;
98 unsigned int signr;
99 unsigned int ifnum;
100 void __user *userbuffer;
101 void __user *userurb;
102 sigval_t userurb_sigval;
103 struct urb *urb;
104 struct usb_memory *usbm;
105 unsigned int mem_usage;
106 int status;
107 u8 bulk_addr;
108 u8 bulk_status;
109 };
110
111 static bool usbfs_snoop;
112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
114
115 static unsigned usbfs_snoop_max = 65536;
116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
117 MODULE_PARM_DESC(usbfs_snoop_max,
118 "maximum number of bytes to print while snooping");
119
120 #define snoop(dev, format, arg...) \
121 do { \
122 if (usbfs_snoop) \
123 dev_info(dev, format, ## arg); \
124 } while (0)
125
126 enum snoop_when {
127 SUBMIT, COMPLETE
128 };
129
130 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
131
132 /* Limit on the total amount of memory we can allocate for transfers */
133 static u32 usbfs_memory_mb = 16;
134 module_param(usbfs_memory_mb, uint, 0644);
135 MODULE_PARM_DESC(usbfs_memory_mb,
136 "maximum MB allowed for usbfs buffers (0 = no limit)");
137
138 /* Hard limit, necessary to avoid arithmetic overflow */
139 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
140
141 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
142
143 /* Check whether it's okay to allocate more memory for a transfer */
144 static int usbfs_increase_memory_usage(u64 amount)
145 {
146 u64 lim;
147
148 lim = READ_ONCE(usbfs_memory_mb);
149 lim <<= 20;
150
151 atomic64_add(amount, &usbfs_memory_usage);
152
153 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
154 atomic64_sub(amount, &usbfs_memory_usage);
155 return -ENOMEM;
156 }
157
158 return 0;
159 }
160
161 /* Memory for a transfer is being deallocated */
162 static void usbfs_decrease_memory_usage(u64 amount)
163 {
164 atomic64_sub(amount, &usbfs_memory_usage);
165 }
166
167 static int connected(struct usb_dev_state *ps)
168 {
169 return (!list_empty(&ps->list) &&
170 ps->dev->state != USB_STATE_NOTATTACHED);
171 }
172
173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
174 {
175 struct usb_dev_state *ps = usbm->ps;
176 unsigned long flags;
177
178 spin_lock_irqsave(&ps->lock, flags);
179 --*count;
180 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
181 list_del(&usbm->memlist);
182 spin_unlock_irqrestore(&ps->lock, flags);
183
184 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
185 usbm->dma_handle);
186 usbfs_decrease_memory_usage(
187 usbm->size + sizeof(struct usb_memory));
188 kfree(usbm);
189 } else {
190 spin_unlock_irqrestore(&ps->lock, flags);
191 }
192 }
193
194 static void usbdev_vm_open(struct vm_area_struct *vma)
195 {
196 struct usb_memory *usbm = vma->vm_private_data;
197 unsigned long flags;
198
199 spin_lock_irqsave(&usbm->ps->lock, flags);
200 ++usbm->vma_use_count;
201 spin_unlock_irqrestore(&usbm->ps->lock, flags);
202 }
203
204 static void usbdev_vm_close(struct vm_area_struct *vma)
205 {
206 struct usb_memory *usbm = vma->vm_private_data;
207
208 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
209 }
210
211 static const struct vm_operations_struct usbdev_vm_ops = {
212 .open = usbdev_vm_open,
213 .close = usbdev_vm_close
214 };
215
216 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
217 {
218 struct usb_memory *usbm = NULL;
219 struct usb_dev_state *ps = file->private_data;
220 size_t size = vma->vm_end - vma->vm_start;
221 void *mem;
222 unsigned long flags;
223 dma_addr_t dma_handle;
224 int ret;
225
226 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
227 if (ret)
228 goto error;
229
230 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
231 if (!usbm) {
232 ret = -ENOMEM;
233 goto error_decrease_mem;
234 }
235
236 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
237 &dma_handle);
238 if (!mem) {
239 ret = -ENOMEM;
240 goto error_free_usbm;
241 }
242
243 memset(mem, 0, size);
244
245 usbm->mem = mem;
246 usbm->dma_handle = dma_handle;
247 usbm->size = size;
248 usbm->ps = ps;
249 usbm->vm_start = vma->vm_start;
250 usbm->vma_use_count = 1;
251 INIT_LIST_HEAD(&usbm->memlist);
252
253 if (remap_pfn_range(vma, vma->vm_start,
254 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
255 size, vma->vm_page_prot) < 0) {
256 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
257 return -EAGAIN;
258 }
259
260 vma->vm_flags |= VM_IO;
261 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
262 vma->vm_ops = &usbdev_vm_ops;
263 vma->vm_private_data = usbm;
264
265 spin_lock_irqsave(&ps->lock, flags);
266 list_add_tail(&usbm->memlist, &ps->memory_list);
267 spin_unlock_irqrestore(&ps->lock, flags);
268
269 return 0;
270
271 error_free_usbm:
272 kfree(usbm);
273 error_decrease_mem:
274 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
275 error:
276 return ret;
277 }
278
279 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
280 loff_t *ppos)
281 {
282 struct usb_dev_state *ps = file->private_data;
283 struct usb_device *dev = ps->dev;
284 ssize_t ret = 0;
285 unsigned len;
286 loff_t pos;
287 int i;
288
289 pos = *ppos;
290 usb_lock_device(dev);
291 if (!connected(ps)) {
292 ret = -ENODEV;
293 goto err;
294 } else if (pos < 0) {
295 ret = -EINVAL;
296 goto err;
297 }
298
299 if (pos < sizeof(struct usb_device_descriptor)) {
300 /* 18 bytes - fits on the stack */
301 struct usb_device_descriptor temp_desc;
302
303 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
304 le16_to_cpus(&temp_desc.bcdUSB);
305 le16_to_cpus(&temp_desc.idVendor);
306 le16_to_cpus(&temp_desc.idProduct);
307 le16_to_cpus(&temp_desc.bcdDevice);
308
309 len = sizeof(struct usb_device_descriptor) - pos;
310 if (len > nbytes)
311 len = nbytes;
312 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
313 ret = -EFAULT;
314 goto err;
315 }
316
317 *ppos += len;
318 buf += len;
319 nbytes -= len;
320 ret += len;
321 }
322
323 pos = sizeof(struct usb_device_descriptor);
324 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
325 struct usb_config_descriptor *config =
326 (struct usb_config_descriptor *)dev->rawdescriptors[i];
327 unsigned int length = le16_to_cpu(config->wTotalLength);
328
329 if (*ppos < pos + length) {
330
331 /* The descriptor may claim to be longer than it
332 * really is. Here is the actual allocated length. */
333 unsigned alloclen =
334 le16_to_cpu(dev->config[i].desc.wTotalLength);
335
336 len = length - (*ppos - pos);
337 if (len > nbytes)
338 len = nbytes;
339
340 /* Simply don't write (skip over) unallocated parts */
341 if (alloclen > (*ppos - pos)) {
342 alloclen -= (*ppos - pos);
343 if (copy_to_user(buf,
344 dev->rawdescriptors[i] + (*ppos - pos),
345 min(len, alloclen))) {
346 ret = -EFAULT;
347 goto err;
348 }
349 }
350
351 *ppos += len;
352 buf += len;
353 nbytes -= len;
354 ret += len;
355 }
356
357 pos += length;
358 }
359
360 err:
361 usb_unlock_device(dev);
362 return ret;
363 }
364
365 /*
366 * async list handling
367 */
368
369 static struct async *alloc_async(unsigned int numisoframes)
370 {
371 struct async *as;
372
373 as = kzalloc(sizeof(struct async), GFP_KERNEL);
374 if (!as)
375 return NULL;
376 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
377 if (!as->urb) {
378 kfree(as);
379 return NULL;
380 }
381 return as;
382 }
383
384 static void free_async(struct async *as)
385 {
386 int i;
387
388 put_pid(as->pid);
389 if (as->cred)
390 put_cred(as->cred);
391 for (i = 0; i < as->urb->num_sgs; i++) {
392 if (sg_page(&as->urb->sg[i]))
393 kfree(sg_virt(&as->urb->sg[i]));
394 }
395
396 kfree(as->urb->sg);
397 if (as->usbm == NULL)
398 kfree(as->urb->transfer_buffer);
399 else
400 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
401
402 kfree(as->urb->setup_packet);
403 usb_free_urb(as->urb);
404 usbfs_decrease_memory_usage(as->mem_usage);
405 kfree(as);
406 }
407
408 static void async_newpending(struct async *as)
409 {
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_add_tail(&as->asynclist, &ps->async_pending);
415 spin_unlock_irqrestore(&ps->lock, flags);
416 }
417
418 static void async_removepending(struct async *as)
419 {
420 struct usb_dev_state *ps = as->ps;
421 unsigned long flags;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 list_del_init(&as->asynclist);
425 spin_unlock_irqrestore(&ps->lock, flags);
426 }
427
428 static struct async *async_getcompleted(struct usb_dev_state *ps)
429 {
430 unsigned long flags;
431 struct async *as = NULL;
432
433 spin_lock_irqsave(&ps->lock, flags);
434 if (!list_empty(&ps->async_completed)) {
435 as = list_entry(ps->async_completed.next, struct async,
436 asynclist);
437 list_del_init(&as->asynclist);
438 }
439 spin_unlock_irqrestore(&ps->lock, flags);
440 return as;
441 }
442
443 static struct async *async_getpending(struct usb_dev_state *ps,
444 void __user *userurb)
445 {
446 struct async *as;
447
448 list_for_each_entry(as, &ps->async_pending, asynclist)
449 if (as->userurb == userurb) {
450 list_del_init(&as->asynclist);
451 return as;
452 }
453
454 return NULL;
455 }
456
457 static void snoop_urb(struct usb_device *udev,
458 void __user *userurb, int pipe, unsigned length,
459 int timeout_or_status, enum snoop_when when,
460 unsigned char *data, unsigned data_len)
461 {
462 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
463 static const char *dirs[] = {"out", "in"};
464 int ep;
465 const char *t, *d;
466
467 if (!usbfs_snoop)
468 return;
469
470 ep = usb_pipeendpoint(pipe);
471 t = types[usb_pipetype(pipe)];
472 d = dirs[!!usb_pipein(pipe)];
473
474 if (userurb) { /* Async */
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
477 "length %u\n",
478 userurb, ep, t, d, length);
479 else
480 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
481 "actual_length %u status %d\n",
482 userurb, ep, t, d, length,
483 timeout_or_status);
484 } else {
485 if (when == SUBMIT)
486 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
487 "timeout %d\n",
488 ep, t, d, length, timeout_or_status);
489 else
490 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
491 "status %d\n",
492 ep, t, d, length, timeout_or_status);
493 }
494
495 data_len = min(data_len, usbfs_snoop_max);
496 if (data && data_len > 0) {
497 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
498 data, data_len, 1);
499 }
500 }
501
502 static void snoop_urb_data(struct urb *urb, unsigned len)
503 {
504 int i, size;
505
506 len = min(len, usbfs_snoop_max);
507 if (!usbfs_snoop || len == 0)
508 return;
509
510 if (urb->num_sgs == 0) {
511 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
512 urb->transfer_buffer, len, 1);
513 return;
514 }
515
516 for (i = 0; i < urb->num_sgs && len; i++) {
517 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
518 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
519 sg_virt(&urb->sg[i]), size, 1);
520 len -= size;
521 }
522 }
523
524 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
525 {
526 unsigned i, len, size;
527
528 if (urb->number_of_packets > 0) /* Isochronous */
529 len = urb->transfer_buffer_length;
530 else /* Non-Isoc */
531 len = urb->actual_length;
532
533 if (urb->num_sgs == 0) {
534 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
535 return -EFAULT;
536 return 0;
537 }
538
539 for (i = 0; i < urb->num_sgs && len; i++) {
540 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
541 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
542 return -EFAULT;
543 userbuffer += size;
544 len -= size;
545 }
546
547 return 0;
548 }
549
550 #define AS_CONTINUATION 1
551 #define AS_UNLINK 2
552
553 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
554 __releases(ps->lock)
555 __acquires(ps->lock)
556 {
557 struct urb *urb;
558 struct async *as;
559
560 /* Mark all the pending URBs that match bulk_addr, up to but not
561 * including the first one without AS_CONTINUATION. If such an
562 * URB is encountered then a new transfer has already started so
563 * the endpoint doesn't need to be disabled; otherwise it does.
564 */
565 list_for_each_entry(as, &ps->async_pending, asynclist) {
566 if (as->bulk_addr == bulk_addr) {
567 if (as->bulk_status != AS_CONTINUATION)
568 goto rescan;
569 as->bulk_status = AS_UNLINK;
570 as->bulk_addr = 0;
571 }
572 }
573 ps->disabled_bulk_eps |= (1 << bulk_addr);
574
575 /* Now carefully unlink all the marked pending URBs */
576 rescan:
577 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
578 if (as->bulk_status == AS_UNLINK) {
579 as->bulk_status = 0; /* Only once */
580 urb = as->urb;
581 usb_get_urb(urb);
582 spin_unlock(&ps->lock); /* Allow completions */
583 usb_unlink_urb(urb);
584 usb_put_urb(urb);
585 spin_lock(&ps->lock);
586 goto rescan;
587 }
588 }
589 }
590
591 static void async_completed(struct urb *urb)
592 {
593 struct async *as = urb->context;
594 struct usb_dev_state *ps = as->ps;
595 struct pid *pid = NULL;
596 const struct cred *cred = NULL;
597 unsigned long flags;
598 sigval_t addr;
599 int signr, errno;
600
601 spin_lock_irqsave(&ps->lock, flags);
602 list_move_tail(&as->asynclist, &ps->async_completed);
603 as->status = urb->status;
604 signr = as->signr;
605 if (signr) {
606 errno = as->status;
607 addr = as->userurb_sigval;
608 pid = get_pid(as->pid);
609 cred = get_cred(as->cred);
610 }
611 snoop(&urb->dev->dev, "urb complete\n");
612 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
613 as->status, COMPLETE, NULL, 0);
614 if (usb_urb_dir_in(urb))
615 snoop_urb_data(urb, urb->actual_length);
616
617 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
618 as->status != -ENOENT)
619 cancel_bulk_urbs(ps, as->bulk_addr);
620
621 wake_up(&ps->wait);
622 spin_unlock_irqrestore(&ps->lock, flags);
623
624 if (signr) {
625 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
626 put_pid(pid);
627 put_cred(cred);
628 }
629 }
630
631 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
632 {
633 struct urb *urb;
634 struct async *as;
635 unsigned long flags;
636
637 spin_lock_irqsave(&ps->lock, flags);
638 while (!list_empty(list)) {
639 as = list_last_entry(list, struct async, asynclist);
640 list_del_init(&as->asynclist);
641 urb = as->urb;
642 usb_get_urb(urb);
643
644 /* drop the spinlock so the completion handler can run */
645 spin_unlock_irqrestore(&ps->lock, flags);
646 usb_kill_urb(urb);
647 usb_put_urb(urb);
648 spin_lock_irqsave(&ps->lock, flags);
649 }
650 spin_unlock_irqrestore(&ps->lock, flags);
651 }
652
653 static void destroy_async_on_interface(struct usb_dev_state *ps,
654 unsigned int ifnum)
655 {
656 struct list_head *p, *q, hitlist;
657 unsigned long flags;
658
659 INIT_LIST_HEAD(&hitlist);
660 spin_lock_irqsave(&ps->lock, flags);
661 list_for_each_safe(p, q, &ps->async_pending)
662 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
663 list_move_tail(p, &hitlist);
664 spin_unlock_irqrestore(&ps->lock, flags);
665 destroy_async(ps, &hitlist);
666 }
667
668 static void destroy_all_async(struct usb_dev_state *ps)
669 {
670 destroy_async(ps, &ps->async_pending);
671 }
672
673 /*
674 * interface claims are made only at the request of user level code,
675 * which can also release them (explicitly or by closing files).
676 * they're also undone when devices disconnect.
677 */
678
679 static int driver_probe(struct usb_interface *intf,
680 const struct usb_device_id *id)
681 {
682 return -ENODEV;
683 }
684
685 static void driver_disconnect(struct usb_interface *intf)
686 {
687 struct usb_dev_state *ps = usb_get_intfdata(intf);
688 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
689
690 if (!ps)
691 return;
692
693 /* NOTE: this relies on usbcore having canceled and completed
694 * all pending I/O requests; 2.6 does that.
695 */
696
697 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
698 clear_bit(ifnum, &ps->ifclaimed);
699 else
700 dev_warn(&intf->dev, "interface number %u out of range\n",
701 ifnum);
702
703 usb_set_intfdata(intf, NULL);
704
705 /* force async requests to complete */
706 destroy_async_on_interface(ps, ifnum);
707 }
708
709 /* We don't care about suspend/resume of claimed interfaces */
710 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
711 {
712 return 0;
713 }
714
715 static int driver_resume(struct usb_interface *intf)
716 {
717 return 0;
718 }
719
720 /* The following routines apply to the entire device, not interfaces */
721 void usbfs_notify_suspend(struct usb_device *udev)
722 {
723 /* We don't need to handle this */
724 }
725
726 void usbfs_notify_resume(struct usb_device *udev)
727 {
728 struct usb_dev_state *ps;
729
730 /* Protect against simultaneous remove or release */
731 mutex_lock(&usbfs_mutex);
732 list_for_each_entry(ps, &udev->filelist, list) {
733 WRITE_ONCE(ps->not_yet_resumed, 0);
734 wake_up_all(&ps->wait_for_resume);
735 }
736 mutex_unlock(&usbfs_mutex);
737 }
738
739 struct usb_driver usbfs_driver = {
740 .name = "usbfs",
741 .probe = driver_probe,
742 .disconnect = driver_disconnect,
743 .suspend = driver_suspend,
744 .resume = driver_resume,
745 .supports_autosuspend = 1,
746 };
747
748 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
749 {
750 struct usb_device *dev = ps->dev;
751 struct usb_interface *intf;
752 int err;
753
754 if (ifnum >= 8*sizeof(ps->ifclaimed))
755 return -EINVAL;
756 /* already claimed */
757 if (test_bit(ifnum, &ps->ifclaimed))
758 return 0;
759
760 if (ps->privileges_dropped &&
761 !test_bit(ifnum, &ps->interface_allowed_mask))
762 return -EACCES;
763
764 intf = usb_ifnum_to_if(dev, ifnum);
765 if (!intf)
766 err = -ENOENT;
767 else {
768 unsigned int old_suppress;
769
770 /* suppress uevents while claiming interface */
771 old_suppress = dev_get_uevent_suppress(&intf->dev);
772 dev_set_uevent_suppress(&intf->dev, 1);
773 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
774 dev_set_uevent_suppress(&intf->dev, old_suppress);
775 }
776 if (err == 0)
777 set_bit(ifnum, &ps->ifclaimed);
778 return err;
779 }
780
781 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
782 {
783 struct usb_device *dev;
784 struct usb_interface *intf;
785 int err;
786
787 err = -EINVAL;
788 if (ifnum >= 8*sizeof(ps->ifclaimed))
789 return err;
790 dev = ps->dev;
791 intf = usb_ifnum_to_if(dev, ifnum);
792 if (!intf)
793 err = -ENOENT;
794 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
795 unsigned int old_suppress;
796
797 /* suppress uevents while releasing interface */
798 old_suppress = dev_get_uevent_suppress(&intf->dev);
799 dev_set_uevent_suppress(&intf->dev, 1);
800 usb_driver_release_interface(&usbfs_driver, intf);
801 dev_set_uevent_suppress(&intf->dev, old_suppress);
802 err = 0;
803 }
804 return err;
805 }
806
807 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
808 {
809 if (ps->dev->state != USB_STATE_CONFIGURED)
810 return -EHOSTUNREACH;
811 if (ifnum >= 8*sizeof(ps->ifclaimed))
812 return -EINVAL;
813 if (test_bit(ifnum, &ps->ifclaimed))
814 return 0;
815 /* if not yet claimed, claim it for the driver */
816 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
817 "interface %u before use\n", task_pid_nr(current),
818 current->comm, ifnum);
819 return claimintf(ps, ifnum);
820 }
821
822 static int findintfep(struct usb_device *dev, unsigned int ep)
823 {
824 unsigned int i, j, e;
825 struct usb_interface *intf;
826 struct usb_host_interface *alts;
827 struct usb_endpoint_descriptor *endpt;
828
829 if (ep & ~(USB_DIR_IN|0xf))
830 return -EINVAL;
831 if (!dev->actconfig)
832 return -ESRCH;
833 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
834 intf = dev->actconfig->interface[i];
835 for (j = 0; j < intf->num_altsetting; j++) {
836 alts = &intf->altsetting[j];
837 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
838 endpt = &alts->endpoint[e].desc;
839 if (endpt->bEndpointAddress == ep)
840 return alts->desc.bInterfaceNumber;
841 }
842 }
843 }
844 return -ENOENT;
845 }
846
847 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
848 unsigned int request, unsigned int index)
849 {
850 int ret = 0;
851 struct usb_host_interface *alt_setting;
852
853 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
854 && ps->dev->state != USB_STATE_ADDRESS
855 && ps->dev->state != USB_STATE_CONFIGURED)
856 return -EHOSTUNREACH;
857 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
858 return 0;
859
860 /*
861 * check for the special corner case 'get_device_id' in the printer
862 * class specification, which we always want to allow as it is used
863 * to query things like ink level, etc.
864 */
865 if (requesttype == 0xa1 && request == 0) {
866 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
867 index >> 8, index & 0xff);
868 if (alt_setting
869 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
870 return 0;
871 }
872
873 index &= 0xff;
874 switch (requesttype & USB_RECIP_MASK) {
875 case USB_RECIP_ENDPOINT:
876 if ((index & ~USB_DIR_IN) == 0)
877 return 0;
878 ret = findintfep(ps->dev, index);
879 if (ret < 0) {
880 /*
881 * Some not fully compliant Win apps seem to get
882 * index wrong and have the endpoint number here
883 * rather than the endpoint address (with the
884 * correct direction). Win does let this through,
885 * so we'll not reject it here but leave it to
886 * the device to not break KVM. But we warn.
887 */
888 ret = findintfep(ps->dev, index ^ 0x80);
889 if (ret >= 0)
890 dev_info(&ps->dev->dev,
891 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
892 __func__, task_pid_nr(current),
893 current->comm, index, index ^ 0x80);
894 }
895 if (ret >= 0)
896 ret = checkintf(ps, ret);
897 break;
898
899 case USB_RECIP_INTERFACE:
900 ret = checkintf(ps, index);
901 break;
902 }
903 return ret;
904 }
905
906 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
907 unsigned char ep)
908 {
909 if (ep & USB_ENDPOINT_DIR_MASK)
910 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
911 else
912 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
913 }
914
915 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
916 struct usbdevfs_streams __user *streams,
917 unsigned int *num_streams_ret,
918 unsigned int *num_eps_ret,
919 struct usb_host_endpoint ***eps_ret,
920 struct usb_interface **intf_ret)
921 {
922 unsigned int i, num_streams, num_eps;
923 struct usb_host_endpoint **eps;
924 struct usb_interface *intf = NULL;
925 unsigned char ep;
926 int ifnum, ret;
927
928 if (get_user(num_streams, &streams->num_streams) ||
929 get_user(num_eps, &streams->num_eps))
930 return -EFAULT;
931
932 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
933 return -EINVAL;
934
935 /* The XHCI controller allows max 2 ^ 16 streams */
936 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
937 return -EINVAL;
938
939 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
940 if (!eps)
941 return -ENOMEM;
942
943 for (i = 0; i < num_eps; i++) {
944 if (get_user(ep, &streams->eps[i])) {
945 ret = -EFAULT;
946 goto error;
947 }
948 eps[i] = ep_to_host_endpoint(ps->dev, ep);
949 if (!eps[i]) {
950 ret = -EINVAL;
951 goto error;
952 }
953
954 /* usb_alloc/free_streams operate on an usb_interface */
955 ifnum = findintfep(ps->dev, ep);
956 if (ifnum < 0) {
957 ret = ifnum;
958 goto error;
959 }
960
961 if (i == 0) {
962 ret = checkintf(ps, ifnum);
963 if (ret < 0)
964 goto error;
965 intf = usb_ifnum_to_if(ps->dev, ifnum);
966 } else {
967 /* Verify all eps belong to the same interface */
968 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
969 ret = -EINVAL;
970 goto error;
971 }
972 }
973 }
974
975 if (num_streams_ret)
976 *num_streams_ret = num_streams;
977 *num_eps_ret = num_eps;
978 *eps_ret = eps;
979 *intf_ret = intf;
980
981 return 0;
982
983 error:
984 kfree(eps);
985 return ret;
986 }
987
988 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
989 {
990 struct device *dev;
991
992 dev = bus_find_device_by_devt(&usb_bus_type, devt);
993 if (!dev)
994 return NULL;
995 return to_usb_device(dev);
996 }
997
998 /*
999 * file operations
1000 */
1001 static int usbdev_open(struct inode *inode, struct file *file)
1002 {
1003 struct usb_device *dev = NULL;
1004 struct usb_dev_state *ps;
1005 int ret;
1006
1007 ret = -ENOMEM;
1008 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1009 if (!ps)
1010 goto out_free_ps;
1011
1012 ret = -ENODEV;
1013
1014 /* usbdev device-node */
1015 if (imajor(inode) == USB_DEVICE_MAJOR)
1016 dev = usbdev_lookup_by_devt(inode->i_rdev);
1017 if (!dev)
1018 goto out_free_ps;
1019
1020 usb_lock_device(dev);
1021 if (dev->state == USB_STATE_NOTATTACHED)
1022 goto out_unlock_device;
1023
1024 ret = usb_autoresume_device(dev);
1025 if (ret)
1026 goto out_unlock_device;
1027
1028 ps->dev = dev;
1029 ps->file = file;
1030 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1031 spin_lock_init(&ps->lock);
1032 INIT_LIST_HEAD(&ps->list);
1033 INIT_LIST_HEAD(&ps->async_pending);
1034 INIT_LIST_HEAD(&ps->async_completed);
1035 INIT_LIST_HEAD(&ps->memory_list);
1036 init_waitqueue_head(&ps->wait);
1037 init_waitqueue_head(&ps->wait_for_resume);
1038 ps->disc_pid = get_pid(task_pid(current));
1039 ps->cred = get_current_cred();
1040 smp_wmb();
1041
1042 /* Can't race with resume; the device is already active */
1043 list_add_tail(&ps->list, &dev->filelist);
1044 file->private_data = ps;
1045 usb_unlock_device(dev);
1046 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1047 current->comm);
1048 return ret;
1049
1050 out_unlock_device:
1051 usb_unlock_device(dev);
1052 usb_put_dev(dev);
1053 out_free_ps:
1054 kfree(ps);
1055 return ret;
1056 }
1057
1058 static int usbdev_release(struct inode *inode, struct file *file)
1059 {
1060 struct usb_dev_state *ps = file->private_data;
1061 struct usb_device *dev = ps->dev;
1062 unsigned int ifnum;
1063 struct async *as;
1064
1065 usb_lock_device(dev);
1066 usb_hub_release_all_ports(dev, ps);
1067
1068 /* Protect against simultaneous resume */
1069 mutex_lock(&usbfs_mutex);
1070 list_del_init(&ps->list);
1071 mutex_unlock(&usbfs_mutex);
1072
1073 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1074 ifnum++) {
1075 if (test_bit(ifnum, &ps->ifclaimed))
1076 releaseintf(ps, ifnum);
1077 }
1078 destroy_all_async(ps);
1079 if (!ps->suspend_allowed)
1080 usb_autosuspend_device(dev);
1081 usb_unlock_device(dev);
1082 usb_put_dev(dev);
1083 put_pid(ps->disc_pid);
1084 put_cred(ps->cred);
1085
1086 as = async_getcompleted(ps);
1087 while (as) {
1088 free_async(as);
1089 as = async_getcompleted(ps);
1090 }
1091
1092 kfree(ps);
1093 return 0;
1094 }
1095
1096 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1097 {
1098 struct usb_device *dev = ps->dev;
1099 struct usbdevfs_ctrltransfer ctrl;
1100 unsigned int tmo;
1101 unsigned char *tbuf;
1102 unsigned wLength;
1103 int i, pipe, ret;
1104
1105 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1106 return -EFAULT;
1107 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1108 ctrl.wIndex);
1109 if (ret)
1110 return ret;
1111 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1112 if (wLength > PAGE_SIZE)
1113 return -EINVAL;
1114 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1115 sizeof(struct usb_ctrlrequest));
1116 if (ret)
1117 return ret;
1118 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1119 if (!tbuf) {
1120 ret = -ENOMEM;
1121 goto done;
1122 }
1123 tmo = ctrl.timeout;
1124 snoop(&dev->dev, "control urb: bRequestType=%02x "
1125 "bRequest=%02x wValue=%04x "
1126 "wIndex=%04x wLength=%04x\n",
1127 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1128 ctrl.wIndex, ctrl.wLength);
1129 if (ctrl.bRequestType & 0x80) {
1130 if (ctrl.wLength && !access_ok(ctrl.data,
1131 ctrl.wLength)) {
1132 ret = -EINVAL;
1133 goto done;
1134 }
1135 pipe = usb_rcvctrlpipe(dev, 0);
1136 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1137
1138 usb_unlock_device(dev);
1139 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1140 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1141 tbuf, ctrl.wLength, tmo);
1142 usb_lock_device(dev);
1143 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1144 tbuf, max(i, 0));
1145 if ((i > 0) && ctrl.wLength) {
1146 if (copy_to_user(ctrl.data, tbuf, i)) {
1147 ret = -EFAULT;
1148 goto done;
1149 }
1150 }
1151 } else {
1152 if (ctrl.wLength) {
1153 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1154 ret = -EFAULT;
1155 goto done;
1156 }
1157 }
1158 pipe = usb_sndctrlpipe(dev, 0);
1159 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1160 tbuf, ctrl.wLength);
1161
1162 usb_unlock_device(dev);
1163 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1164 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1165 tbuf, ctrl.wLength, tmo);
1166 usb_lock_device(dev);
1167 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1168 }
1169 if (i < 0 && i != -EPIPE) {
1170 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1171 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1172 current->comm, ctrl.bRequestType, ctrl.bRequest,
1173 ctrl.wLength, i);
1174 }
1175 ret = i;
1176 done:
1177 free_page((unsigned long) tbuf);
1178 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1179 sizeof(struct usb_ctrlrequest));
1180 return ret;
1181 }
1182
1183 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1184 {
1185 struct usb_device *dev = ps->dev;
1186 struct usbdevfs_bulktransfer bulk;
1187 unsigned int tmo, len1, pipe;
1188 int len2;
1189 unsigned char *tbuf;
1190 int i, ret;
1191
1192 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1193 return -EFAULT;
1194 ret = findintfep(ps->dev, bulk.ep);
1195 if (ret < 0)
1196 return ret;
1197 ret = checkintf(ps, ret);
1198 if (ret)
1199 return ret;
1200 if (bulk.ep & USB_DIR_IN)
1201 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1202 else
1203 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1204 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1205 return -EINVAL;
1206 len1 = bulk.len;
1207 if (len1 >= (INT_MAX - sizeof(struct urb)))
1208 return -EINVAL;
1209 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1210 if (ret)
1211 return ret;
1212 tbuf = kmalloc(len1, GFP_KERNEL);
1213 if (!tbuf) {
1214 ret = -ENOMEM;
1215 goto done;
1216 }
1217 tmo = bulk.timeout;
1218 if (bulk.ep & 0x80) {
1219 if (len1 && !access_ok(bulk.data, len1)) {
1220 ret = -EINVAL;
1221 goto done;
1222 }
1223 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1224
1225 usb_unlock_device(dev);
1226 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1227 usb_lock_device(dev);
1228 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1229
1230 if (!i && len2) {
1231 if (copy_to_user(bulk.data, tbuf, len2)) {
1232 ret = -EFAULT;
1233 goto done;
1234 }
1235 }
1236 } else {
1237 if (len1) {
1238 if (copy_from_user(tbuf, bulk.data, len1)) {
1239 ret = -EFAULT;
1240 goto done;
1241 }
1242 }
1243 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1244
1245 usb_unlock_device(dev);
1246 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1247 usb_lock_device(dev);
1248 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1249 }
1250 ret = (i < 0 ? i : len2);
1251 done:
1252 kfree(tbuf);
1253 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1254 return ret;
1255 }
1256
1257 static void check_reset_of_active_ep(struct usb_device *udev,
1258 unsigned int epnum, char *ioctl_name)
1259 {
1260 struct usb_host_endpoint **eps;
1261 struct usb_host_endpoint *ep;
1262
1263 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1264 ep = eps[epnum & 0x0f];
1265 if (ep && !list_empty(&ep->urb_list))
1266 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1267 task_pid_nr(current), current->comm,
1268 ioctl_name, epnum);
1269 }
1270
1271 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1272 {
1273 unsigned int ep;
1274 int ret;
1275
1276 if (get_user(ep, (unsigned int __user *)arg))
1277 return -EFAULT;
1278 ret = findintfep(ps->dev, ep);
1279 if (ret < 0)
1280 return ret;
1281 ret = checkintf(ps, ret);
1282 if (ret)
1283 return ret;
1284 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1285 usb_reset_endpoint(ps->dev, ep);
1286 return 0;
1287 }
1288
1289 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1290 {
1291 unsigned int ep;
1292 int pipe;
1293 int ret;
1294
1295 if (get_user(ep, (unsigned int __user *)arg))
1296 return -EFAULT;
1297 ret = findintfep(ps->dev, ep);
1298 if (ret < 0)
1299 return ret;
1300 ret = checkintf(ps, ret);
1301 if (ret)
1302 return ret;
1303 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1304 if (ep & USB_DIR_IN)
1305 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1306 else
1307 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1308
1309 return usb_clear_halt(ps->dev, pipe);
1310 }
1311
1312 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1313 {
1314 struct usbdevfs_getdriver gd;
1315 struct usb_interface *intf;
1316 int ret;
1317
1318 if (copy_from_user(&gd, arg, sizeof(gd)))
1319 return -EFAULT;
1320 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1321 if (!intf || !intf->dev.driver)
1322 ret = -ENODATA;
1323 else {
1324 strlcpy(gd.driver, intf->dev.driver->name,
1325 sizeof(gd.driver));
1326 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1327 }
1328 return ret;
1329 }
1330
1331 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1332 {
1333 struct usbdevfs_connectinfo ci;
1334
1335 memset(&ci, 0, sizeof(ci));
1336 ci.devnum = ps->dev->devnum;
1337 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1338
1339 if (copy_to_user(arg, &ci, sizeof(ci)))
1340 return -EFAULT;
1341 return 0;
1342 }
1343
1344 static int proc_conninfo_ex(struct usb_dev_state *ps,
1345 void __user *arg, size_t size)
1346 {
1347 struct usbdevfs_conninfo_ex ci;
1348 struct usb_device *udev = ps->dev;
1349
1350 if (size < sizeof(ci.size))
1351 return -EINVAL;
1352
1353 memset(&ci, 0, sizeof(ci));
1354 ci.size = sizeof(ci);
1355 ci.busnum = udev->bus->busnum;
1356 ci.devnum = udev->devnum;
1357 ci.speed = udev->speed;
1358
1359 while (udev && udev->portnum != 0) {
1360 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1361 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1362 udev->portnum;
1363 udev = udev->parent;
1364 }
1365
1366 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1367 memmove(&ci.ports[0],
1368 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1369 ci.num_ports);
1370
1371 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1372 return -EFAULT;
1373
1374 return 0;
1375 }
1376
1377 static int proc_resetdevice(struct usb_dev_state *ps)
1378 {
1379 struct usb_host_config *actconfig = ps->dev->actconfig;
1380 struct usb_interface *interface;
1381 int i, number;
1382
1383 /* Don't allow a device reset if the process has dropped the
1384 * privilege to do such things and any of the interfaces are
1385 * currently claimed.
1386 */
1387 if (ps->privileges_dropped && actconfig) {
1388 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1389 interface = actconfig->interface[i];
1390 number = interface->cur_altsetting->desc.bInterfaceNumber;
1391 if (usb_interface_claimed(interface) &&
1392 !test_bit(number, &ps->ifclaimed)) {
1393 dev_warn(&ps->dev->dev,
1394 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1395 number, interface->dev.driver->name, current->comm);
1396 return -EACCES;
1397 }
1398 }
1399 }
1400
1401 return usb_reset_device(ps->dev);
1402 }
1403
1404 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1405 {
1406 struct usbdevfs_setinterface setintf;
1407 int ret;
1408
1409 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1410 return -EFAULT;
1411 ret = checkintf(ps, setintf.interface);
1412 if (ret)
1413 return ret;
1414
1415 destroy_async_on_interface(ps, setintf.interface);
1416
1417 return usb_set_interface(ps->dev, setintf.interface,
1418 setintf.altsetting);
1419 }
1420
1421 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1422 {
1423 int u;
1424 int status = 0;
1425 struct usb_host_config *actconfig;
1426
1427 if (get_user(u, (int __user *)arg))
1428 return -EFAULT;
1429
1430 actconfig = ps->dev->actconfig;
1431
1432 /* Don't touch the device if any interfaces are claimed.
1433 * It could interfere with other drivers' operations, and if
1434 * an interface is claimed by usbfs it could easily deadlock.
1435 */
1436 if (actconfig) {
1437 int i;
1438
1439 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1440 if (usb_interface_claimed(actconfig->interface[i])) {
1441 dev_warn(&ps->dev->dev,
1442 "usbfs: interface %d claimed by %s "
1443 "while '%s' sets config #%d\n",
1444 actconfig->interface[i]
1445 ->cur_altsetting
1446 ->desc.bInterfaceNumber,
1447 actconfig->interface[i]
1448 ->dev.driver->name,
1449 current->comm, u);
1450 status = -EBUSY;
1451 break;
1452 }
1453 }
1454 }
1455
1456 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1457 * so avoid usb_set_configuration()'s kick to sysfs
1458 */
1459 if (status == 0) {
1460 if (actconfig && actconfig->desc.bConfigurationValue == u)
1461 status = usb_reset_configuration(ps->dev);
1462 else
1463 status = usb_set_configuration(ps->dev, u);
1464 }
1465
1466 return status;
1467 }
1468
1469 static struct usb_memory *
1470 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1471 {
1472 struct usb_memory *usbm = NULL, *iter;
1473 unsigned long flags;
1474 unsigned long uurb_start = (unsigned long)uurb->buffer;
1475
1476 spin_lock_irqsave(&ps->lock, flags);
1477 list_for_each_entry(iter, &ps->memory_list, memlist) {
1478 if (uurb_start >= iter->vm_start &&
1479 uurb_start < iter->vm_start + iter->size) {
1480 if (uurb->buffer_length > iter->vm_start + iter->size -
1481 uurb_start) {
1482 usbm = ERR_PTR(-EINVAL);
1483 } else {
1484 usbm = iter;
1485 usbm->urb_use_count++;
1486 }
1487 break;
1488 }
1489 }
1490 spin_unlock_irqrestore(&ps->lock, flags);
1491 return usbm;
1492 }
1493
1494 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1495 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1496 void __user *arg, sigval_t userurb_sigval)
1497 {
1498 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1499 struct usb_host_endpoint *ep;
1500 struct async *as = NULL;
1501 struct usb_ctrlrequest *dr = NULL;
1502 unsigned int u, totlen, isofrmlen;
1503 int i, ret, num_sgs = 0, ifnum = -1;
1504 int number_of_packets = 0;
1505 unsigned int stream_id = 0;
1506 void *buf;
1507 bool is_in;
1508 bool allow_short = false;
1509 bool allow_zero = false;
1510 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1511 USBDEVFS_URB_BULK_CONTINUATION |
1512 USBDEVFS_URB_NO_FSBR |
1513 USBDEVFS_URB_ZERO_PACKET |
1514 USBDEVFS_URB_NO_INTERRUPT;
1515 /* USBDEVFS_URB_ISO_ASAP is a special case */
1516 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1517 mask |= USBDEVFS_URB_ISO_ASAP;
1518
1519 if (uurb->flags & ~mask)
1520 return -EINVAL;
1521
1522 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1523 return -EINVAL;
1524 if (uurb->buffer_length > 0 && !uurb->buffer)
1525 return -EINVAL;
1526 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1527 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1528 ifnum = findintfep(ps->dev, uurb->endpoint);
1529 if (ifnum < 0)
1530 return ifnum;
1531 ret = checkintf(ps, ifnum);
1532 if (ret)
1533 return ret;
1534 }
1535 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1536 if (!ep)
1537 return -ENOENT;
1538 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1539
1540 u = 0;
1541 switch (uurb->type) {
1542 case USBDEVFS_URB_TYPE_CONTROL:
1543 if (!usb_endpoint_xfer_control(&ep->desc))
1544 return -EINVAL;
1545 /* min 8 byte setup packet */
1546 if (uurb->buffer_length < 8)
1547 return -EINVAL;
1548 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1549 if (!dr)
1550 return -ENOMEM;
1551 if (copy_from_user(dr, uurb->buffer, 8)) {
1552 ret = -EFAULT;
1553 goto error;
1554 }
1555 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1556 ret = -EINVAL;
1557 goto error;
1558 }
1559 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1560 le16_to_cpu(dr->wIndex));
1561 if (ret)
1562 goto error;
1563 uurb->buffer_length = le16_to_cpu(dr->wLength);
1564 uurb->buffer += 8;
1565 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1566 is_in = true;
1567 uurb->endpoint |= USB_DIR_IN;
1568 } else {
1569 is_in = false;
1570 uurb->endpoint &= ~USB_DIR_IN;
1571 }
1572 if (is_in)
1573 allow_short = true;
1574 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1575 "bRequest=%02x wValue=%04x "
1576 "wIndex=%04x wLength=%04x\n",
1577 dr->bRequestType, dr->bRequest,
1578 __le16_to_cpu(dr->wValue),
1579 __le16_to_cpu(dr->wIndex),
1580 __le16_to_cpu(dr->wLength));
1581 u = sizeof(struct usb_ctrlrequest);
1582 break;
1583
1584 case USBDEVFS_URB_TYPE_BULK:
1585 if (!is_in)
1586 allow_zero = true;
1587 else
1588 allow_short = true;
1589 switch (usb_endpoint_type(&ep->desc)) {
1590 case USB_ENDPOINT_XFER_CONTROL:
1591 case USB_ENDPOINT_XFER_ISOC:
1592 return -EINVAL;
1593 case USB_ENDPOINT_XFER_INT:
1594 /* allow single-shot interrupt transfers */
1595 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1596 goto interrupt_urb;
1597 }
1598 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1599 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1600 num_sgs = 0;
1601 if (ep->streams)
1602 stream_id = uurb->stream_id;
1603 break;
1604
1605 case USBDEVFS_URB_TYPE_INTERRUPT:
1606 if (!usb_endpoint_xfer_int(&ep->desc))
1607 return -EINVAL;
1608 interrupt_urb:
1609 if (!is_in)
1610 allow_zero = true;
1611 else
1612 allow_short = true;
1613 break;
1614
1615 case USBDEVFS_URB_TYPE_ISO:
1616 /* arbitrary limit */
1617 if (uurb->number_of_packets < 1 ||
1618 uurb->number_of_packets > 128)
1619 return -EINVAL;
1620 if (!usb_endpoint_xfer_isoc(&ep->desc))
1621 return -EINVAL;
1622 number_of_packets = uurb->number_of_packets;
1623 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1624 number_of_packets;
1625 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1626 if (IS_ERR(isopkt)) {
1627 ret = PTR_ERR(isopkt);
1628 isopkt = NULL;
1629 goto error;
1630 }
1631 for (totlen = u = 0; u < number_of_packets; u++) {
1632 /*
1633 * arbitrary limit need for USB 3.1 Gen2
1634 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1635 */
1636 if (isopkt[u].length > 98304) {
1637 ret = -EINVAL;
1638 goto error;
1639 }
1640 totlen += isopkt[u].length;
1641 }
1642 u *= sizeof(struct usb_iso_packet_descriptor);
1643 uurb->buffer_length = totlen;
1644 break;
1645
1646 default:
1647 return -EINVAL;
1648 }
1649
1650 if (uurb->buffer_length > 0 &&
1651 !access_ok(uurb->buffer, uurb->buffer_length)) {
1652 ret = -EFAULT;
1653 goto error;
1654 }
1655 as = alloc_async(number_of_packets);
1656 if (!as) {
1657 ret = -ENOMEM;
1658 goto error;
1659 }
1660
1661 as->usbm = find_memory_area(ps, uurb);
1662 if (IS_ERR(as->usbm)) {
1663 ret = PTR_ERR(as->usbm);
1664 as->usbm = NULL;
1665 goto error;
1666 }
1667
1668 /* do not use SG buffers when memory mapped segments
1669 * are in use
1670 */
1671 if (as->usbm)
1672 num_sgs = 0;
1673
1674 u += sizeof(struct async) + sizeof(struct urb) +
1675 (as->usbm ? 0 : uurb->buffer_length) +
1676 num_sgs * sizeof(struct scatterlist);
1677 ret = usbfs_increase_memory_usage(u);
1678 if (ret)
1679 goto error;
1680 as->mem_usage = u;
1681
1682 if (num_sgs) {
1683 as->urb->sg = kmalloc_array(num_sgs,
1684 sizeof(struct scatterlist),
1685 GFP_KERNEL);
1686 if (!as->urb->sg) {
1687 ret = -ENOMEM;
1688 goto error;
1689 }
1690 as->urb->num_sgs = num_sgs;
1691 sg_init_table(as->urb->sg, as->urb->num_sgs);
1692
1693 totlen = uurb->buffer_length;
1694 for (i = 0; i < as->urb->num_sgs; i++) {
1695 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1696 buf = kmalloc(u, GFP_KERNEL);
1697 if (!buf) {
1698 ret = -ENOMEM;
1699 goto error;
1700 }
1701 sg_set_buf(&as->urb->sg[i], buf, u);
1702
1703 if (!is_in) {
1704 if (copy_from_user(buf, uurb->buffer, u)) {
1705 ret = -EFAULT;
1706 goto error;
1707 }
1708 uurb->buffer += u;
1709 }
1710 totlen -= u;
1711 }
1712 } else if (uurb->buffer_length > 0) {
1713 if (as->usbm) {
1714 unsigned long uurb_start = (unsigned long)uurb->buffer;
1715
1716 as->urb->transfer_buffer = as->usbm->mem +
1717 (uurb_start - as->usbm->vm_start);
1718 } else {
1719 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1720 GFP_KERNEL);
1721 if (!as->urb->transfer_buffer) {
1722 ret = -ENOMEM;
1723 goto error;
1724 }
1725 if (!is_in) {
1726 if (copy_from_user(as->urb->transfer_buffer,
1727 uurb->buffer,
1728 uurb->buffer_length)) {
1729 ret = -EFAULT;
1730 goto error;
1731 }
1732 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1733 /*
1734 * Isochronous input data may end up being
1735 * discontiguous if some of the packets are
1736 * short. Clear the buffer so that the gaps
1737 * don't leak kernel data to userspace.
1738 */
1739 memset(as->urb->transfer_buffer, 0,
1740 uurb->buffer_length);
1741 }
1742 }
1743 }
1744 as->urb->dev = ps->dev;
1745 as->urb->pipe = (uurb->type << 30) |
1746 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1747 (uurb->endpoint & USB_DIR_IN);
1748
1749 /* This tedious sequence is necessary because the URB_* flags
1750 * are internal to the kernel and subject to change, whereas
1751 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1752 */
1753 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1754 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1755 u |= URB_ISO_ASAP;
1756 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1757 u |= URB_SHORT_NOT_OK;
1758 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1759 u |= URB_ZERO_PACKET;
1760 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1761 u |= URB_NO_INTERRUPT;
1762 as->urb->transfer_flags = u;
1763
1764 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1765 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1766 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1767 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1768
1769 as->urb->transfer_buffer_length = uurb->buffer_length;
1770 as->urb->setup_packet = (unsigned char *)dr;
1771 dr = NULL;
1772 as->urb->start_frame = uurb->start_frame;
1773 as->urb->number_of_packets = number_of_packets;
1774 as->urb->stream_id = stream_id;
1775
1776 if (ep->desc.bInterval) {
1777 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1778 ps->dev->speed == USB_SPEED_HIGH ||
1779 ps->dev->speed >= USB_SPEED_SUPER)
1780 as->urb->interval = 1 <<
1781 min(15, ep->desc.bInterval - 1);
1782 else
1783 as->urb->interval = ep->desc.bInterval;
1784 }
1785
1786 as->urb->context = as;
1787 as->urb->complete = async_completed;
1788 for (totlen = u = 0; u < number_of_packets; u++) {
1789 as->urb->iso_frame_desc[u].offset = totlen;
1790 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1791 totlen += isopkt[u].length;
1792 }
1793 kfree(isopkt);
1794 isopkt = NULL;
1795 as->ps = ps;
1796 as->userurb = arg;
1797 as->userurb_sigval = userurb_sigval;
1798 if (as->usbm) {
1799 unsigned long uurb_start = (unsigned long)uurb->buffer;
1800
1801 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1802 as->urb->transfer_dma = as->usbm->dma_handle +
1803 (uurb_start - as->usbm->vm_start);
1804 } else if (is_in && uurb->buffer_length > 0)
1805 as->userbuffer = uurb->buffer;
1806 as->signr = uurb->signr;
1807 as->ifnum = ifnum;
1808 as->pid = get_pid(task_pid(current));
1809 as->cred = get_current_cred();
1810 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1811 as->urb->transfer_buffer_length, 0, SUBMIT,
1812 NULL, 0);
1813 if (!is_in)
1814 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1815
1816 async_newpending(as);
1817
1818 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1819 spin_lock_irq(&ps->lock);
1820
1821 /* Not exactly the endpoint address; the direction bit is
1822 * shifted to the 0x10 position so that the value will be
1823 * between 0 and 31.
1824 */
1825 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1826 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1827 >> 3);
1828
1829 /* If this bulk URB is the start of a new transfer, re-enable
1830 * the endpoint. Otherwise mark it as a continuation URB.
1831 */
1832 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1833 as->bulk_status = AS_CONTINUATION;
1834 else
1835 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1836
1837 /* Don't accept continuation URBs if the endpoint is
1838 * disabled because of an earlier error.
1839 */
1840 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1841 ret = -EREMOTEIO;
1842 else
1843 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1844 spin_unlock_irq(&ps->lock);
1845 } else {
1846 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1847 }
1848
1849 if (ret) {
1850 dev_printk(KERN_DEBUG, &ps->dev->dev,
1851 "usbfs: usb_submit_urb returned %d\n", ret);
1852 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1853 0, ret, COMPLETE, NULL, 0);
1854 async_removepending(as);
1855 goto error;
1856 }
1857 return 0;
1858
1859 error:
1860 kfree(isopkt);
1861 kfree(dr);
1862 if (as)
1863 free_async(as);
1864 return ret;
1865 }
1866
1867 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1868 {
1869 struct usbdevfs_urb uurb;
1870 sigval_t userurb_sigval;
1871
1872 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1873 return -EFAULT;
1874
1875 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1876 userurb_sigval.sival_ptr = arg;
1877
1878 return proc_do_submiturb(ps, &uurb,
1879 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1880 arg, userurb_sigval);
1881 }
1882
1883 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1884 {
1885 struct urb *urb;
1886 struct async *as;
1887 unsigned long flags;
1888
1889 spin_lock_irqsave(&ps->lock, flags);
1890 as = async_getpending(ps, arg);
1891 if (!as) {
1892 spin_unlock_irqrestore(&ps->lock, flags);
1893 return -EINVAL;
1894 }
1895
1896 urb = as->urb;
1897 usb_get_urb(urb);
1898 spin_unlock_irqrestore(&ps->lock, flags);
1899
1900 usb_kill_urb(urb);
1901 usb_put_urb(urb);
1902
1903 return 0;
1904 }
1905
1906 static void compute_isochronous_actual_length(struct urb *urb)
1907 {
1908 unsigned int i;
1909
1910 if (urb->number_of_packets > 0) {
1911 urb->actual_length = 0;
1912 for (i = 0; i < urb->number_of_packets; i++)
1913 urb->actual_length +=
1914 urb->iso_frame_desc[i].actual_length;
1915 }
1916 }
1917
1918 static int processcompl(struct async *as, void __user * __user *arg)
1919 {
1920 struct urb *urb = as->urb;
1921 struct usbdevfs_urb __user *userurb = as->userurb;
1922 void __user *addr = as->userurb;
1923 unsigned int i;
1924
1925 compute_isochronous_actual_length(urb);
1926 if (as->userbuffer && urb->actual_length) {
1927 if (copy_urb_data_to_user(as->userbuffer, urb))
1928 goto err_out;
1929 }
1930 if (put_user(as->status, &userurb->status))
1931 goto err_out;
1932 if (put_user(urb->actual_length, &userurb->actual_length))
1933 goto err_out;
1934 if (put_user(urb->error_count, &userurb->error_count))
1935 goto err_out;
1936
1937 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1938 for (i = 0; i < urb->number_of_packets; i++) {
1939 if (put_user(urb->iso_frame_desc[i].actual_length,
1940 &userurb->iso_frame_desc[i].actual_length))
1941 goto err_out;
1942 if (put_user(urb->iso_frame_desc[i].status,
1943 &userurb->iso_frame_desc[i].status))
1944 goto err_out;
1945 }
1946 }
1947
1948 if (put_user(addr, (void __user * __user *)arg))
1949 return -EFAULT;
1950 return 0;
1951
1952 err_out:
1953 return -EFAULT;
1954 }
1955
1956 static struct async *reap_as(struct usb_dev_state *ps)
1957 {
1958 DECLARE_WAITQUEUE(wait, current);
1959 struct async *as = NULL;
1960 struct usb_device *dev = ps->dev;
1961
1962 add_wait_queue(&ps->wait, &wait);
1963 for (;;) {
1964 __set_current_state(TASK_INTERRUPTIBLE);
1965 as = async_getcompleted(ps);
1966 if (as || !connected(ps))
1967 break;
1968 if (signal_pending(current))
1969 break;
1970 usb_unlock_device(dev);
1971 schedule();
1972 usb_lock_device(dev);
1973 }
1974 remove_wait_queue(&ps->wait, &wait);
1975 set_current_state(TASK_RUNNING);
1976 return as;
1977 }
1978
1979 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1980 {
1981 struct async *as = reap_as(ps);
1982
1983 if (as) {
1984 int retval;
1985
1986 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1987 retval = processcompl(as, (void __user * __user *)arg);
1988 free_async(as);
1989 return retval;
1990 }
1991 if (signal_pending(current))
1992 return -EINTR;
1993 return -ENODEV;
1994 }
1995
1996 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1997 {
1998 int retval;
1999 struct async *as;
2000
2001 as = async_getcompleted(ps);
2002 if (as) {
2003 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2004 retval = processcompl(as, (void __user * __user *)arg);
2005 free_async(as);
2006 } else {
2007 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2008 }
2009 return retval;
2010 }
2011
2012 #ifdef CONFIG_COMPAT
2013 static int proc_control_compat(struct usb_dev_state *ps,
2014 struct usbdevfs_ctrltransfer32 __user *p32)
2015 {
2016 struct usbdevfs_ctrltransfer __user *p;
2017 __u32 udata;
2018 p = compat_alloc_user_space(sizeof(*p));
2019 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
2020 get_user(udata, &p32->data) ||
2021 put_user(compat_ptr(udata), &p->data))
2022 return -EFAULT;
2023 return proc_control(ps, p);
2024 }
2025
2026 static int proc_bulk_compat(struct usb_dev_state *ps,
2027 struct usbdevfs_bulktransfer32 __user *p32)
2028 {
2029 struct usbdevfs_bulktransfer __user *p;
2030 compat_uint_t n;
2031 compat_caddr_t addr;
2032
2033 p = compat_alloc_user_space(sizeof(*p));
2034
2035 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
2036 get_user(n, &p32->len) || put_user(n, &p->len) ||
2037 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2038 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2039 return -EFAULT;
2040
2041 return proc_bulk(ps, p);
2042 }
2043 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2044 {
2045 struct usbdevfs_disconnectsignal32 ds;
2046
2047 if (copy_from_user(&ds, arg, sizeof(ds)))
2048 return -EFAULT;
2049 ps->discsignr = ds.signr;
2050 ps->disccontext.sival_int = ds.context;
2051 return 0;
2052 }
2053
2054 static int get_urb32(struct usbdevfs_urb *kurb,
2055 struct usbdevfs_urb32 __user *uurb)
2056 {
2057 struct usbdevfs_urb32 urb32;
2058 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2059 return -EFAULT;
2060 kurb->type = urb32.type;
2061 kurb->endpoint = urb32.endpoint;
2062 kurb->status = urb32.status;
2063 kurb->flags = urb32.flags;
2064 kurb->buffer = compat_ptr(urb32.buffer);
2065 kurb->buffer_length = urb32.buffer_length;
2066 kurb->actual_length = urb32.actual_length;
2067 kurb->start_frame = urb32.start_frame;
2068 kurb->number_of_packets = urb32.number_of_packets;
2069 kurb->error_count = urb32.error_count;
2070 kurb->signr = urb32.signr;
2071 kurb->usercontext = compat_ptr(urb32.usercontext);
2072 return 0;
2073 }
2074
2075 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2076 {
2077 struct usbdevfs_urb uurb;
2078 sigval_t userurb_sigval;
2079
2080 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2081 return -EFAULT;
2082
2083 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2084 userurb_sigval.sival_int = ptr_to_compat(arg);
2085
2086 return proc_do_submiturb(ps, &uurb,
2087 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2088 arg, userurb_sigval);
2089 }
2090
2091 static int processcompl_compat(struct async *as, void __user * __user *arg)
2092 {
2093 struct urb *urb = as->urb;
2094 struct usbdevfs_urb32 __user *userurb = as->userurb;
2095 void __user *addr = as->userurb;
2096 unsigned int i;
2097
2098 compute_isochronous_actual_length(urb);
2099 if (as->userbuffer && urb->actual_length) {
2100 if (copy_urb_data_to_user(as->userbuffer, urb))
2101 return -EFAULT;
2102 }
2103 if (put_user(as->status, &userurb->status))
2104 return -EFAULT;
2105 if (put_user(urb->actual_length, &userurb->actual_length))
2106 return -EFAULT;
2107 if (put_user(urb->error_count, &userurb->error_count))
2108 return -EFAULT;
2109
2110 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2111 for (i = 0; i < urb->number_of_packets; i++) {
2112 if (put_user(urb->iso_frame_desc[i].actual_length,
2113 &userurb->iso_frame_desc[i].actual_length))
2114 return -EFAULT;
2115 if (put_user(urb->iso_frame_desc[i].status,
2116 &userurb->iso_frame_desc[i].status))
2117 return -EFAULT;
2118 }
2119 }
2120
2121 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2122 return -EFAULT;
2123 return 0;
2124 }
2125
2126 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2127 {
2128 struct async *as = reap_as(ps);
2129
2130 if (as) {
2131 int retval;
2132
2133 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2134 retval = processcompl_compat(as, (void __user * __user *)arg);
2135 free_async(as);
2136 return retval;
2137 }
2138 if (signal_pending(current))
2139 return -EINTR;
2140 return -ENODEV;
2141 }
2142
2143 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2144 {
2145 int retval;
2146 struct async *as;
2147
2148 as = async_getcompleted(ps);
2149 if (as) {
2150 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2151 retval = processcompl_compat(as, (void __user * __user *)arg);
2152 free_async(as);
2153 } else {
2154 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2155 }
2156 return retval;
2157 }
2158
2159
2160 #endif
2161
2162 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2163 {
2164 struct usbdevfs_disconnectsignal ds;
2165
2166 if (copy_from_user(&ds, arg, sizeof(ds)))
2167 return -EFAULT;
2168 ps->discsignr = ds.signr;
2169 ps->disccontext.sival_ptr = ds.context;
2170 return 0;
2171 }
2172
2173 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2174 {
2175 unsigned int ifnum;
2176
2177 if (get_user(ifnum, (unsigned int __user *)arg))
2178 return -EFAULT;
2179 return claimintf(ps, ifnum);
2180 }
2181
2182 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2183 {
2184 unsigned int ifnum;
2185 int ret;
2186
2187 if (get_user(ifnum, (unsigned int __user *)arg))
2188 return -EFAULT;
2189 ret = releaseintf(ps, ifnum);
2190 if (ret < 0)
2191 return ret;
2192 destroy_async_on_interface(ps, ifnum);
2193 return 0;
2194 }
2195
2196 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2197 {
2198 int size;
2199 void *buf = NULL;
2200 int retval = 0;
2201 struct usb_interface *intf = NULL;
2202 struct usb_driver *driver = NULL;
2203
2204 if (ps->privileges_dropped)
2205 return -EACCES;
2206
2207 if (!connected(ps))
2208 return -ENODEV;
2209
2210 /* alloc buffer */
2211 size = _IOC_SIZE(ctl->ioctl_code);
2212 if (size > 0) {
2213 buf = kmalloc(size, GFP_KERNEL);
2214 if (buf == NULL)
2215 return -ENOMEM;
2216 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2217 if (copy_from_user(buf, ctl->data, size)) {
2218 kfree(buf);
2219 return -EFAULT;
2220 }
2221 } else {
2222 memset(buf, 0, size);
2223 }
2224 }
2225
2226 if (ps->dev->state != USB_STATE_CONFIGURED)
2227 retval = -EHOSTUNREACH;
2228 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2229 retval = -EINVAL;
2230 else switch (ctl->ioctl_code) {
2231
2232 /* disconnect kernel driver from interface */
2233 case USBDEVFS_DISCONNECT:
2234 if (intf->dev.driver) {
2235 driver = to_usb_driver(intf->dev.driver);
2236 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2237 usb_driver_release_interface(driver, intf);
2238 } else
2239 retval = -ENODATA;
2240 break;
2241
2242 /* let kernel drivers try to (re)bind to the interface */
2243 case USBDEVFS_CONNECT:
2244 if (!intf->dev.driver)
2245 retval = device_attach(&intf->dev);
2246 else
2247 retval = -EBUSY;
2248 break;
2249
2250 /* talk directly to the interface's driver */
2251 default:
2252 if (intf->dev.driver)
2253 driver = to_usb_driver(intf->dev.driver);
2254 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2255 retval = -ENOTTY;
2256 } else {
2257 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2258 if (retval == -ENOIOCTLCMD)
2259 retval = -ENOTTY;
2260 }
2261 }
2262
2263 /* cleanup and return */
2264 if (retval >= 0
2265 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2266 && size > 0
2267 && copy_to_user(ctl->data, buf, size) != 0)
2268 retval = -EFAULT;
2269
2270 kfree(buf);
2271 return retval;
2272 }
2273
2274 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2275 {
2276 struct usbdevfs_ioctl ctrl;
2277
2278 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2279 return -EFAULT;
2280 return proc_ioctl(ps, &ctrl);
2281 }
2282
2283 #ifdef CONFIG_COMPAT
2284 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2285 {
2286 struct usbdevfs_ioctl32 ioc32;
2287 struct usbdevfs_ioctl ctrl;
2288
2289 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2290 return -EFAULT;
2291 ctrl.ifno = ioc32.ifno;
2292 ctrl.ioctl_code = ioc32.ioctl_code;
2293 ctrl.data = compat_ptr(ioc32.data);
2294 return proc_ioctl(ps, &ctrl);
2295 }
2296 #endif
2297
2298 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2299 {
2300 unsigned portnum;
2301 int rc;
2302
2303 if (get_user(portnum, (unsigned __user *) arg))
2304 return -EFAULT;
2305 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2306 if (rc == 0)
2307 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2308 portnum, task_pid_nr(current), current->comm);
2309 return rc;
2310 }
2311
2312 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2313 {
2314 unsigned portnum;
2315
2316 if (get_user(portnum, (unsigned __user *) arg))
2317 return -EFAULT;
2318 return usb_hub_release_port(ps->dev, portnum, ps);
2319 }
2320
2321 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2322 {
2323 __u32 caps;
2324
2325 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2326 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2327 USBDEVFS_CAP_DROP_PRIVILEGES |
2328 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2329 if (!ps->dev->bus->no_stop_on_short)
2330 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2331 if (ps->dev->bus->sg_tablesize)
2332 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2333
2334 if (put_user(caps, (__u32 __user *)arg))
2335 return -EFAULT;
2336
2337 return 0;
2338 }
2339
2340 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2341 {
2342 struct usbdevfs_disconnect_claim dc;
2343 struct usb_interface *intf;
2344
2345 if (copy_from_user(&dc, arg, sizeof(dc)))
2346 return -EFAULT;
2347
2348 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2349 if (!intf)
2350 return -EINVAL;
2351
2352 if (intf->dev.driver) {
2353 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2354
2355 if (ps->privileges_dropped)
2356 return -EACCES;
2357
2358 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2359 strncmp(dc.driver, intf->dev.driver->name,
2360 sizeof(dc.driver)) != 0)
2361 return -EBUSY;
2362
2363 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2364 strncmp(dc.driver, intf->dev.driver->name,
2365 sizeof(dc.driver)) == 0)
2366 return -EBUSY;
2367
2368 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2369 usb_driver_release_interface(driver, intf);
2370 }
2371
2372 return claimintf(ps, dc.interface);
2373 }
2374
2375 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2376 {
2377 unsigned num_streams, num_eps;
2378 struct usb_host_endpoint **eps;
2379 struct usb_interface *intf;
2380 int r;
2381
2382 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2383 &eps, &intf);
2384 if (r)
2385 return r;
2386
2387 destroy_async_on_interface(ps,
2388 intf->altsetting[0].desc.bInterfaceNumber);
2389
2390 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2391 kfree(eps);
2392 return r;
2393 }
2394
2395 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2396 {
2397 unsigned num_eps;
2398 struct usb_host_endpoint **eps;
2399 struct usb_interface *intf;
2400 int r;
2401
2402 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2403 if (r)
2404 return r;
2405
2406 destroy_async_on_interface(ps,
2407 intf->altsetting[0].desc.bInterfaceNumber);
2408
2409 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2410 kfree(eps);
2411 return r;
2412 }
2413
2414 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2415 {
2416 u32 data;
2417
2418 if (copy_from_user(&data, arg, sizeof(data)))
2419 return -EFAULT;
2420
2421 /* This is a one way operation. Once privileges are
2422 * dropped, you cannot regain them. You may however reissue
2423 * this ioctl to shrink the allowed interfaces mask.
2424 */
2425 ps->interface_allowed_mask &= data;
2426 ps->privileges_dropped = true;
2427
2428 return 0;
2429 }
2430
2431 static int proc_forbid_suspend(struct usb_dev_state *ps)
2432 {
2433 int ret = 0;
2434
2435 if (ps->suspend_allowed) {
2436 ret = usb_autoresume_device(ps->dev);
2437 if (ret == 0)
2438 ps->suspend_allowed = false;
2439 else if (ret != -ENODEV)
2440 ret = -EIO;
2441 }
2442 return ret;
2443 }
2444
2445 static int proc_allow_suspend(struct usb_dev_state *ps)
2446 {
2447 if (!connected(ps))
2448 return -ENODEV;
2449
2450 WRITE_ONCE(ps->not_yet_resumed, 1);
2451 if (!ps->suspend_allowed) {
2452 usb_autosuspend_device(ps->dev);
2453 ps->suspend_allowed = true;
2454 }
2455 return 0;
2456 }
2457
2458 static int proc_wait_for_resume(struct usb_dev_state *ps)
2459 {
2460 int ret;
2461
2462 usb_unlock_device(ps->dev);
2463 ret = wait_event_interruptible(ps->wait_for_resume,
2464 READ_ONCE(ps->not_yet_resumed) == 0);
2465 usb_lock_device(ps->dev);
2466
2467 if (ret != 0)
2468 return -EINTR;
2469 return proc_forbid_suspend(ps);
2470 }
2471
2472 /*
2473 * NOTE: All requests here that have interface numbers as parameters
2474 * are assuming that somehow the configuration has been prevented from
2475 * changing. But there's no mechanism to ensure that...
2476 */
2477 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2478 void __user *p)
2479 {
2480 struct usb_dev_state *ps = file->private_data;
2481 struct inode *inode = file_inode(file);
2482 struct usb_device *dev = ps->dev;
2483 int ret = -ENOTTY;
2484
2485 if (!(file->f_mode & FMODE_WRITE))
2486 return -EPERM;
2487
2488 usb_lock_device(dev);
2489
2490 /* Reap operations are allowed even after disconnection */
2491 switch (cmd) {
2492 case USBDEVFS_REAPURB:
2493 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2494 ret = proc_reapurb(ps, p);
2495 goto done;
2496
2497 case USBDEVFS_REAPURBNDELAY:
2498 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2499 ret = proc_reapurbnonblock(ps, p);
2500 goto done;
2501
2502 #ifdef CONFIG_COMPAT
2503 case USBDEVFS_REAPURB32:
2504 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2505 ret = proc_reapurb_compat(ps, p);
2506 goto done;
2507
2508 case USBDEVFS_REAPURBNDELAY32:
2509 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2510 ret = proc_reapurbnonblock_compat(ps, p);
2511 goto done;
2512 #endif
2513 }
2514
2515 if (!connected(ps)) {
2516 usb_unlock_device(dev);
2517 return -ENODEV;
2518 }
2519
2520 switch (cmd) {
2521 case USBDEVFS_CONTROL:
2522 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2523 ret = proc_control(ps, p);
2524 if (ret >= 0)
2525 inode->i_mtime = current_time(inode);
2526 break;
2527
2528 case USBDEVFS_BULK:
2529 snoop(&dev->dev, "%s: BULK\n", __func__);
2530 ret = proc_bulk(ps, p);
2531 if (ret >= 0)
2532 inode->i_mtime = current_time(inode);
2533 break;
2534
2535 case USBDEVFS_RESETEP:
2536 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2537 ret = proc_resetep(ps, p);
2538 if (ret >= 0)
2539 inode->i_mtime = current_time(inode);
2540 break;
2541
2542 case USBDEVFS_RESET:
2543 snoop(&dev->dev, "%s: RESET\n", __func__);
2544 ret = proc_resetdevice(ps);
2545 break;
2546
2547 case USBDEVFS_CLEAR_HALT:
2548 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2549 ret = proc_clearhalt(ps, p);
2550 if (ret >= 0)
2551 inode->i_mtime = current_time(inode);
2552 break;
2553
2554 case USBDEVFS_GETDRIVER:
2555 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2556 ret = proc_getdriver(ps, p);
2557 break;
2558
2559 case USBDEVFS_CONNECTINFO:
2560 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2561 ret = proc_connectinfo(ps, p);
2562 break;
2563
2564 case USBDEVFS_SETINTERFACE:
2565 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2566 ret = proc_setintf(ps, p);
2567 break;
2568
2569 case USBDEVFS_SETCONFIGURATION:
2570 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2571 ret = proc_setconfig(ps, p);
2572 break;
2573
2574 case USBDEVFS_SUBMITURB:
2575 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2576 ret = proc_submiturb(ps, p);
2577 if (ret >= 0)
2578 inode->i_mtime = current_time(inode);
2579 break;
2580
2581 #ifdef CONFIG_COMPAT
2582 case USBDEVFS_CONTROL32:
2583 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2584 ret = proc_control_compat(ps, p);
2585 if (ret >= 0)
2586 inode->i_mtime = current_time(inode);
2587 break;
2588
2589 case USBDEVFS_BULK32:
2590 snoop(&dev->dev, "%s: BULK32\n", __func__);
2591 ret = proc_bulk_compat(ps, p);
2592 if (ret >= 0)
2593 inode->i_mtime = current_time(inode);
2594 break;
2595
2596 case USBDEVFS_DISCSIGNAL32:
2597 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2598 ret = proc_disconnectsignal_compat(ps, p);
2599 break;
2600
2601 case USBDEVFS_SUBMITURB32:
2602 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2603 ret = proc_submiturb_compat(ps, p);
2604 if (ret >= 0)
2605 inode->i_mtime = current_time(inode);
2606 break;
2607
2608 case USBDEVFS_IOCTL32:
2609 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2610 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2611 break;
2612 #endif
2613
2614 case USBDEVFS_DISCARDURB:
2615 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2616 ret = proc_unlinkurb(ps, p);
2617 break;
2618
2619 case USBDEVFS_DISCSIGNAL:
2620 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2621 ret = proc_disconnectsignal(ps, p);
2622 break;
2623
2624 case USBDEVFS_CLAIMINTERFACE:
2625 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2626 ret = proc_claiminterface(ps, p);
2627 break;
2628
2629 case USBDEVFS_RELEASEINTERFACE:
2630 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2631 ret = proc_releaseinterface(ps, p);
2632 break;
2633
2634 case USBDEVFS_IOCTL:
2635 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2636 ret = proc_ioctl_default(ps, p);
2637 break;
2638
2639 case USBDEVFS_CLAIM_PORT:
2640 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2641 ret = proc_claim_port(ps, p);
2642 break;
2643
2644 case USBDEVFS_RELEASE_PORT:
2645 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2646 ret = proc_release_port(ps, p);
2647 break;
2648 case USBDEVFS_GET_CAPABILITIES:
2649 ret = proc_get_capabilities(ps, p);
2650 break;
2651 case USBDEVFS_DISCONNECT_CLAIM:
2652 ret = proc_disconnect_claim(ps, p);
2653 break;
2654 case USBDEVFS_ALLOC_STREAMS:
2655 ret = proc_alloc_streams(ps, p);
2656 break;
2657 case USBDEVFS_FREE_STREAMS:
2658 ret = proc_free_streams(ps, p);
2659 break;
2660 case USBDEVFS_DROP_PRIVILEGES:
2661 ret = proc_drop_privileges(ps, p);
2662 break;
2663 case USBDEVFS_GET_SPEED:
2664 ret = ps->dev->speed;
2665 break;
2666 case USBDEVFS_FORBID_SUSPEND:
2667 ret = proc_forbid_suspend(ps);
2668 break;
2669 case USBDEVFS_ALLOW_SUSPEND:
2670 ret = proc_allow_suspend(ps);
2671 break;
2672 case USBDEVFS_WAIT_FOR_RESUME:
2673 ret = proc_wait_for_resume(ps);
2674 break;
2675 }
2676
2677 /* Handle variable-length commands */
2678 switch (cmd & ~IOCSIZE_MASK) {
2679 case USBDEVFS_CONNINFO_EX(0):
2680 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2681 break;
2682 }
2683
2684 done:
2685 usb_unlock_device(dev);
2686 if (ret >= 0)
2687 inode->i_atime = current_time(inode);
2688 return ret;
2689 }
2690
2691 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2692 unsigned long arg)
2693 {
2694 int ret;
2695
2696 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2697
2698 return ret;
2699 }
2700
2701 /* No kernel lock - fine */
2702 static __poll_t usbdev_poll(struct file *file,
2703 struct poll_table_struct *wait)
2704 {
2705 struct usb_dev_state *ps = file->private_data;
2706 __poll_t mask = 0;
2707
2708 poll_wait(file, &ps->wait, wait);
2709 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2710 mask |= EPOLLOUT | EPOLLWRNORM;
2711 if (!connected(ps))
2712 mask |= EPOLLHUP;
2713 if (list_empty(&ps->list))
2714 mask |= EPOLLERR;
2715 return mask;
2716 }
2717
2718 const struct file_operations usbdev_file_operations = {
2719 .owner = THIS_MODULE,
2720 .llseek = no_seek_end_llseek,
2721 .read = usbdev_read,
2722 .poll = usbdev_poll,
2723 .unlocked_ioctl = usbdev_ioctl,
2724 .compat_ioctl = compat_ptr_ioctl,
2725 .mmap = usbdev_mmap,
2726 .open = usbdev_open,
2727 .release = usbdev_release,
2728 };
2729
2730 static void usbdev_remove(struct usb_device *udev)
2731 {
2732 struct usb_dev_state *ps;
2733
2734 /* Protect against simultaneous resume */
2735 mutex_lock(&usbfs_mutex);
2736 while (!list_empty(&udev->filelist)) {
2737 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2738 destroy_all_async(ps);
2739 wake_up_all(&ps->wait);
2740 WRITE_ONCE(ps->not_yet_resumed, 0);
2741 wake_up_all(&ps->wait_for_resume);
2742 list_del_init(&ps->list);
2743 if (ps->discsignr)
2744 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2745 ps->disc_pid, ps->cred);
2746 }
2747 mutex_unlock(&usbfs_mutex);
2748 }
2749
2750 static int usbdev_notify(struct notifier_block *self,
2751 unsigned long action, void *dev)
2752 {
2753 switch (action) {
2754 case USB_DEVICE_ADD:
2755 break;
2756 case USB_DEVICE_REMOVE:
2757 usbdev_remove(dev);
2758 break;
2759 }
2760 return NOTIFY_OK;
2761 }
2762
2763 static struct notifier_block usbdev_nb = {
2764 .notifier_call = usbdev_notify,
2765 };
2766
2767 static struct cdev usb_device_cdev;
2768
2769 int __init usb_devio_init(void)
2770 {
2771 int retval;
2772
2773 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2774 "usb_device");
2775 if (retval) {
2776 printk(KERN_ERR "Unable to register minors for usb_device\n");
2777 goto out;
2778 }
2779 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2780 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2781 if (retval) {
2782 printk(KERN_ERR "Unable to get usb_device major %d\n",
2783 USB_DEVICE_MAJOR);
2784 goto error_cdev;
2785 }
2786 usb_register_notify(&usbdev_nb);
2787 out:
2788 return retval;
2789
2790 error_cdev:
2791 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2792 goto out;
2793 }
2794
2795 void usb_devio_cleanup(void)
2796 {
2797 usb_unregister_notify(&usbdev_nb);
2798 cdev_del(&usb_device_cdev);
2799 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2800 }
A mirror of Linus' kernel repository