Loading...
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 */
58static DEFINE_MUTEX(usbfs_mutex);
59
60struct 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
82struct 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
93struct 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
111static bool usbfs_snoop;
112module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
113MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
114
115static unsigned usbfs_snoop_max = 65536;
116module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
117MODULE_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
126enum 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 */
133static u32 usbfs_memory_mb = 16;
134module_param(usbfs_memory_mb, uint, 0644);
135MODULE_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
141static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
142
143/* Check whether it's okay to allocate more memory for a transfer */
144static 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 */
162static void usbfs_decrease_memory_usage(u64 amount)
163{
164 atomic64_sub(amount, &usbfs_memory_usage);
165}
166
167static int connected(struct usb_dev_state *ps)
168{
169 return (!list_empty(&ps->list) &&
170 ps->dev->state != USB_STATE_NOTATTACHED);
171}
172
173static 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
194static 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
204static 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
211static const struct vm_operations_struct usbdev_vm_ops = {
212 .open = usbdev_vm_open,
213 .close = usbdev_vm_close
214};
215
216static 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 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
221 size_t size = vma->vm_end - vma->vm_start;
222 void *mem;
223 unsigned long flags;
224 dma_addr_t dma_handle;
225 int ret;
226
227 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
228 if (ret)
229 goto error;
230
231 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
232 if (!usbm) {
233 ret = -ENOMEM;
234 goto error_decrease_mem;
235 }
236
237 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
238 &dma_handle);
239 if (!mem) {
240 ret = -ENOMEM;
241 goto error_free_usbm;
242 }
243
244 memset(mem, 0, size);
245
246 usbm->mem = mem;
247 usbm->dma_handle = dma_handle;
248 usbm->size = size;
249 usbm->ps = ps;
250 usbm->vm_start = vma->vm_start;
251 usbm->vma_use_count = 1;
252 INIT_LIST_HEAD(&usbm->memlist);
253
254 if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
255 if (remap_pfn_range(vma, vma->vm_start,
256 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
257 size, vma->vm_page_prot) < 0) {
258 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
259 return -EAGAIN;
260 }
261 } else {
262 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
263 size)) {
264 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
265 return -EAGAIN;
266 }
267 }
268
269 vma->vm_flags |= VM_IO;
270 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
271 vma->vm_ops = &usbdev_vm_ops;
272 vma->vm_private_data = usbm;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_add_tail(&usbm->memlist, &ps->memory_list);
276 spin_unlock_irqrestore(&ps->lock, flags);
277
278 return 0;
279
280error_free_usbm:
281 kfree(usbm);
282error_decrease_mem:
283 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
284error:
285 return ret;
286}
287
288static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
289 loff_t *ppos)
290{
291 struct usb_dev_state *ps = file->private_data;
292 struct usb_device *dev = ps->dev;
293 ssize_t ret = 0;
294 unsigned len;
295 loff_t pos;
296 int i;
297
298 pos = *ppos;
299 usb_lock_device(dev);
300 if (!connected(ps)) {
301 ret = -ENODEV;
302 goto err;
303 } else if (pos < 0) {
304 ret = -EINVAL;
305 goto err;
306 }
307
308 if (pos < sizeof(struct usb_device_descriptor)) {
309 /* 18 bytes - fits on the stack */
310 struct usb_device_descriptor temp_desc;
311
312 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
313 le16_to_cpus(&temp_desc.bcdUSB);
314 le16_to_cpus(&temp_desc.idVendor);
315 le16_to_cpus(&temp_desc.idProduct);
316 le16_to_cpus(&temp_desc.bcdDevice);
317
318 len = sizeof(struct usb_device_descriptor) - pos;
319 if (len > nbytes)
320 len = nbytes;
321 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
322 ret = -EFAULT;
323 goto err;
324 }
325
326 *ppos += len;
327 buf += len;
328 nbytes -= len;
329 ret += len;
330 }
331
332 pos = sizeof(struct usb_device_descriptor);
333 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
334 struct usb_config_descriptor *config =
335 (struct usb_config_descriptor *)dev->rawdescriptors[i];
336 unsigned int length = le16_to_cpu(config->wTotalLength);
337
338 if (*ppos < pos + length) {
339
340 /* The descriptor may claim to be longer than it
341 * really is. Here is the actual allocated length. */
342 unsigned alloclen =
343 le16_to_cpu(dev->config[i].desc.wTotalLength);
344
345 len = length - (*ppos - pos);
346 if (len > nbytes)
347 len = nbytes;
348
349 /* Simply don't write (skip over) unallocated parts */
350 if (alloclen > (*ppos - pos)) {
351 alloclen -= (*ppos - pos);
352 if (copy_to_user(buf,
353 dev->rawdescriptors[i] + (*ppos - pos),
354 min(len, alloclen))) {
355 ret = -EFAULT;
356 goto err;
357 }
358 }
359
360 *ppos += len;
361 buf += len;
362 nbytes -= len;
363 ret += len;
364 }
365
366 pos += length;
367 }
368
369err:
370 usb_unlock_device(dev);
371 return ret;
372}
373
374/*
375 * async list handling
376 */
377
378static struct async *alloc_async(unsigned int numisoframes)
379{
380 struct async *as;
381
382 as = kzalloc(sizeof(struct async), GFP_KERNEL);
383 if (!as)
384 return NULL;
385 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
386 if (!as->urb) {
387 kfree(as);
388 return NULL;
389 }
390 return as;
391}
392
393static void free_async(struct async *as)
394{
395 int i;
396
397 put_pid(as->pid);
398 if (as->cred)
399 put_cred(as->cred);
400 for (i = 0; i < as->urb->num_sgs; i++) {
401 if (sg_page(&as->urb->sg[i]))
402 kfree(sg_virt(&as->urb->sg[i]));
403 }
404
405 kfree(as->urb->sg);
406 if (as->usbm == NULL)
407 kfree(as->urb->transfer_buffer);
408 else
409 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
410
411 kfree(as->urb->setup_packet);
412 usb_free_urb(as->urb);
413 usbfs_decrease_memory_usage(as->mem_usage);
414 kfree(as);
415}
416
417static void async_newpending(struct async *as)
418{
419 struct usb_dev_state *ps = as->ps;
420 unsigned long flags;
421
422 spin_lock_irqsave(&ps->lock, flags);
423 list_add_tail(&as->asynclist, &ps->async_pending);
424 spin_unlock_irqrestore(&ps->lock, flags);
425}
426
427static void async_removepending(struct async *as)
428{
429 struct usb_dev_state *ps = as->ps;
430 unsigned long flags;
431
432 spin_lock_irqsave(&ps->lock, flags);
433 list_del_init(&as->asynclist);
434 spin_unlock_irqrestore(&ps->lock, flags);
435}
436
437static struct async *async_getcompleted(struct usb_dev_state *ps)
438{
439 unsigned long flags;
440 struct async *as = NULL;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 if (!list_empty(&ps->async_completed)) {
444 as = list_entry(ps->async_completed.next, struct async,
445 asynclist);
446 list_del_init(&as->asynclist);
447 }
448 spin_unlock_irqrestore(&ps->lock, flags);
449 return as;
450}
451
452static struct async *async_getpending(struct usb_dev_state *ps,
453 void __user *userurb)
454{
455 struct async *as;
456
457 list_for_each_entry(as, &ps->async_pending, asynclist)
458 if (as->userurb == userurb) {
459 list_del_init(&as->asynclist);
460 return as;
461 }
462
463 return NULL;
464}
465
466static void snoop_urb(struct usb_device *udev,
467 void __user *userurb, int pipe, unsigned length,
468 int timeout_or_status, enum snoop_when when,
469 unsigned char *data, unsigned data_len)
470{
471 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
472 static const char *dirs[] = {"out", "in"};
473 int ep;
474 const char *t, *d;
475
476 if (!usbfs_snoop)
477 return;
478
479 ep = usb_pipeendpoint(pipe);
480 t = types[usb_pipetype(pipe)];
481 d = dirs[!!usb_pipein(pipe)];
482
483 if (userurb) { /* Async */
484 if (when == SUBMIT)
485 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
486 "length %u\n",
487 userurb, ep, t, d, length);
488 else
489 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
490 "actual_length %u status %d\n",
491 userurb, ep, t, d, length,
492 timeout_or_status);
493 } else {
494 if (when == SUBMIT)
495 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
496 "timeout %d\n",
497 ep, t, d, length, timeout_or_status);
498 else
499 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
500 "status %d\n",
501 ep, t, d, length, timeout_or_status);
502 }
503
504 data_len = min(data_len, usbfs_snoop_max);
505 if (data && data_len > 0) {
506 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
507 data, data_len, 1);
508 }
509}
510
511static void snoop_urb_data(struct urb *urb, unsigned len)
512{
513 int i, size;
514
515 len = min(len, usbfs_snoop_max);
516 if (!usbfs_snoop || len == 0)
517 return;
518
519 if (urb->num_sgs == 0) {
520 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
521 urb->transfer_buffer, len, 1);
522 return;
523 }
524
525 for (i = 0; i < urb->num_sgs && len; i++) {
526 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
527 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
528 sg_virt(&urb->sg[i]), size, 1);
529 len -= size;
530 }
531}
532
533static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
534{
535 unsigned i, len, size;
536
537 if (urb->number_of_packets > 0) /* Isochronous */
538 len = urb->transfer_buffer_length;
539 else /* Non-Isoc */
540 len = urb->actual_length;
541
542 if (urb->num_sgs == 0) {
543 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
544 return -EFAULT;
545 return 0;
546 }
547
548 for (i = 0; i < urb->num_sgs && len; i++) {
549 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
551 return -EFAULT;
552 userbuffer += size;
553 len -= size;
554 }
555
556 return 0;
557}
558
559#define AS_CONTINUATION 1
560#define AS_UNLINK 2
561
562static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
563__releases(ps->lock)
564__acquires(ps->lock)
565{
566 struct urb *urb;
567 struct async *as;
568
569 /* Mark all the pending URBs that match bulk_addr, up to but not
570 * including the first one without AS_CONTINUATION. If such an
571 * URB is encountered then a new transfer has already started so
572 * the endpoint doesn't need to be disabled; otherwise it does.
573 */
574 list_for_each_entry(as, &ps->async_pending, asynclist) {
575 if (as->bulk_addr == bulk_addr) {
576 if (as->bulk_status != AS_CONTINUATION)
577 goto rescan;
578 as->bulk_status = AS_UNLINK;
579 as->bulk_addr = 0;
580 }
581 }
582 ps->disabled_bulk_eps |= (1 << bulk_addr);
583
584 /* Now carefully unlink all the marked pending URBs */
585 rescan:
586 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
587 if (as->bulk_status == AS_UNLINK) {
588 as->bulk_status = 0; /* Only once */
589 urb = as->urb;
590 usb_get_urb(urb);
591 spin_unlock(&ps->lock); /* Allow completions */
592 usb_unlink_urb(urb);
593 usb_put_urb(urb);
594 spin_lock(&ps->lock);
595 goto rescan;
596 }
597 }
598}
599
600static void async_completed(struct urb *urb)
601{
602 struct async *as = urb->context;
603 struct usb_dev_state *ps = as->ps;
604 struct pid *pid = NULL;
605 const struct cred *cred = NULL;
606 unsigned long flags;
607 sigval_t addr;
608 int signr, errno;
609
610 spin_lock_irqsave(&ps->lock, flags);
611 list_move_tail(&as->asynclist, &ps->async_completed);
612 as->status = urb->status;
613 signr = as->signr;
614 if (signr) {
615 errno = as->status;
616 addr = as->userurb_sigval;
617 pid = get_pid(as->pid);
618 cred = get_cred(as->cred);
619 }
620 snoop(&urb->dev->dev, "urb complete\n");
621 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
622 as->status, COMPLETE, NULL, 0);
623 if (usb_urb_dir_in(urb))
624 snoop_urb_data(urb, urb->actual_length);
625
626 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
627 as->status != -ENOENT)
628 cancel_bulk_urbs(ps, as->bulk_addr);
629
630 wake_up(&ps->wait);
631 spin_unlock_irqrestore(&ps->lock, flags);
632
633 if (signr) {
634 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
635 put_pid(pid);
636 put_cred(cred);
637 }
638}
639
640static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
641{
642 struct urb *urb;
643 struct async *as;
644 unsigned long flags;
645
646 spin_lock_irqsave(&ps->lock, flags);
647 while (!list_empty(list)) {
648 as = list_last_entry(list, struct async, asynclist);
649 list_del_init(&as->asynclist);
650 urb = as->urb;
651 usb_get_urb(urb);
652
653 /* drop the spinlock so the completion handler can run */
654 spin_unlock_irqrestore(&ps->lock, flags);
655 usb_kill_urb(urb);
656 usb_put_urb(urb);
657 spin_lock_irqsave(&ps->lock, flags);
658 }
659 spin_unlock_irqrestore(&ps->lock, flags);
660}
661
662static void destroy_async_on_interface(struct usb_dev_state *ps,
663 unsigned int ifnum)
664{
665 struct list_head *p, *q, hitlist;
666 unsigned long flags;
667
668 INIT_LIST_HEAD(&hitlist);
669 spin_lock_irqsave(&ps->lock, flags);
670 list_for_each_safe(p, q, &ps->async_pending)
671 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
672 list_move_tail(p, &hitlist);
673 spin_unlock_irqrestore(&ps->lock, flags);
674 destroy_async(ps, &hitlist);
675}
676
677static void destroy_all_async(struct usb_dev_state *ps)
678{
679 destroy_async(ps, &ps->async_pending);
680}
681
682/*
683 * interface claims are made only at the request of user level code,
684 * which can also release them (explicitly or by closing files).
685 * they're also undone when devices disconnect.
686 */
687
688static int driver_probe(struct usb_interface *intf,
689 const struct usb_device_id *id)
690{
691 return -ENODEV;
692}
693
694static void driver_disconnect(struct usb_interface *intf)
695{
696 struct usb_dev_state *ps = usb_get_intfdata(intf);
697 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
698
699 if (!ps)
700 return;
701
702 /* NOTE: this relies on usbcore having canceled and completed
703 * all pending I/O requests; 2.6 does that.
704 */
705
706 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
707 clear_bit(ifnum, &ps->ifclaimed);
708 else
709 dev_warn(&intf->dev, "interface number %u out of range\n",
710 ifnum);
711
712 usb_set_intfdata(intf, NULL);
713
714 /* force async requests to complete */
715 destroy_async_on_interface(ps, ifnum);
716}
717
718/* We don't care about suspend/resume of claimed interfaces */
719static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
720{
721 return 0;
722}
723
724static int driver_resume(struct usb_interface *intf)
725{
726 return 0;
727}
728
729/* The following routines apply to the entire device, not interfaces */
730void usbfs_notify_suspend(struct usb_device *udev)
731{
732 /* We don't need to handle this */
733}
734
735void usbfs_notify_resume(struct usb_device *udev)
736{
737 struct usb_dev_state *ps;
738
739 /* Protect against simultaneous remove or release */
740 mutex_lock(&usbfs_mutex);
741 list_for_each_entry(ps, &udev->filelist, list) {
742 WRITE_ONCE(ps->not_yet_resumed, 0);
743 wake_up_all(&ps->wait_for_resume);
744 }
745 mutex_unlock(&usbfs_mutex);
746}
747
748struct usb_driver usbfs_driver = {
749 .name = "usbfs",
750 .probe = driver_probe,
751 .disconnect = driver_disconnect,
752 .suspend = driver_suspend,
753 .resume = driver_resume,
754 .supports_autosuspend = 1,
755};
756
757static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
758{
759 struct usb_device *dev = ps->dev;
760 struct usb_interface *intf;
761 int err;
762
763 if (ifnum >= 8*sizeof(ps->ifclaimed))
764 return -EINVAL;
765 /* already claimed */
766 if (test_bit(ifnum, &ps->ifclaimed))
767 return 0;
768
769 if (ps->privileges_dropped &&
770 !test_bit(ifnum, &ps->interface_allowed_mask))
771 return -EACCES;
772
773 intf = usb_ifnum_to_if(dev, ifnum);
774 if (!intf)
775 err = -ENOENT;
776 else {
777 unsigned int old_suppress;
778
779 /* suppress uevents while claiming interface */
780 old_suppress = dev_get_uevent_suppress(&intf->dev);
781 dev_set_uevent_suppress(&intf->dev, 1);
782 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
783 dev_set_uevent_suppress(&intf->dev, old_suppress);
784 }
785 if (err == 0)
786 set_bit(ifnum, &ps->ifclaimed);
787 return err;
788}
789
790static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
791{
792 struct usb_device *dev;
793 struct usb_interface *intf;
794 int err;
795
796 err = -EINVAL;
797 if (ifnum >= 8*sizeof(ps->ifclaimed))
798 return err;
799 dev = ps->dev;
800 intf = usb_ifnum_to_if(dev, ifnum);
801 if (!intf)
802 err = -ENOENT;
803 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
804 unsigned int old_suppress;
805
806 /* suppress uevents while releasing interface */
807 old_suppress = dev_get_uevent_suppress(&intf->dev);
808 dev_set_uevent_suppress(&intf->dev, 1);
809 usb_driver_release_interface(&usbfs_driver, intf);
810 dev_set_uevent_suppress(&intf->dev, old_suppress);
811 err = 0;
812 }
813 return err;
814}
815
816static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
817{
818 if (ps->dev->state != USB_STATE_CONFIGURED)
819 return -EHOSTUNREACH;
820 if (ifnum >= 8*sizeof(ps->ifclaimed))
821 return -EINVAL;
822 if (test_bit(ifnum, &ps->ifclaimed))
823 return 0;
824 /* if not yet claimed, claim it for the driver */
825 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
826 "interface %u before use\n", task_pid_nr(current),
827 current->comm, ifnum);
828 return claimintf(ps, ifnum);
829}
830
831static int findintfep(struct usb_device *dev, unsigned int ep)
832{
833 unsigned int i, j, e;
834 struct usb_interface *intf;
835 struct usb_host_interface *alts;
836 struct usb_endpoint_descriptor *endpt;
837
838 if (ep & ~(USB_DIR_IN|0xf))
839 return -EINVAL;
840 if (!dev->actconfig)
841 return -ESRCH;
842 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
843 intf = dev->actconfig->interface[i];
844 for (j = 0; j < intf->num_altsetting; j++) {
845 alts = &intf->altsetting[j];
846 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
847 endpt = &alts->endpoint[e].desc;
848 if (endpt->bEndpointAddress == ep)
849 return alts->desc.bInterfaceNumber;
850 }
851 }
852 }
853 return -ENOENT;
854}
855
856static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
857 unsigned int request, unsigned int index)
858{
859 int ret = 0;
860 struct usb_host_interface *alt_setting;
861
862 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
863 && ps->dev->state != USB_STATE_ADDRESS
864 && ps->dev->state != USB_STATE_CONFIGURED)
865 return -EHOSTUNREACH;
866 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
867 return 0;
868
869 /*
870 * check for the special corner case 'get_device_id' in the printer
871 * class specification, which we always want to allow as it is used
872 * to query things like ink level, etc.
873 */
874 if (requesttype == 0xa1 && request == 0) {
875 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
876 index >> 8, index & 0xff);
877 if (alt_setting
878 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
879 return 0;
880 }
881
882 index &= 0xff;
883 switch (requesttype & USB_RECIP_MASK) {
884 case USB_RECIP_ENDPOINT:
885 if ((index & ~USB_DIR_IN) == 0)
886 return 0;
887 ret = findintfep(ps->dev, index);
888 if (ret < 0) {
889 /*
890 * Some not fully compliant Win apps seem to get
891 * index wrong and have the endpoint number here
892 * rather than the endpoint address (with the
893 * correct direction). Win does let this through,
894 * so we'll not reject it here but leave it to
895 * the device to not break KVM. But we warn.
896 */
897 ret = findintfep(ps->dev, index ^ 0x80);
898 if (ret >= 0)
899 dev_info(&ps->dev->dev,
900 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
901 __func__, task_pid_nr(current),
902 current->comm, index, index ^ 0x80);
903 }
904 if (ret >= 0)
905 ret = checkintf(ps, ret);
906 break;
907
908 case USB_RECIP_INTERFACE:
909 ret = checkintf(ps, index);
910 break;
911 }
912 return ret;
913}
914
915static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
916 unsigned char ep)
917{
918 if (ep & USB_ENDPOINT_DIR_MASK)
919 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
920 else
921 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
922}
923
924static int parse_usbdevfs_streams(struct usb_dev_state *ps,
925 struct usbdevfs_streams __user *streams,
926 unsigned int *num_streams_ret,
927 unsigned int *num_eps_ret,
928 struct usb_host_endpoint ***eps_ret,
929 struct usb_interface **intf_ret)
930{
931 unsigned int i, num_streams, num_eps;
932 struct usb_host_endpoint **eps;
933 struct usb_interface *intf = NULL;
934 unsigned char ep;
935 int ifnum, ret;
936
937 if (get_user(num_streams, &streams->num_streams) ||
938 get_user(num_eps, &streams->num_eps))
939 return -EFAULT;
940
941 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
942 return -EINVAL;
943
944 /* The XHCI controller allows max 2 ^ 16 streams */
945 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
946 return -EINVAL;
947
948 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
949 if (!eps)
950 return -ENOMEM;
951
952 for (i = 0; i < num_eps; i++) {
953 if (get_user(ep, &streams->eps[i])) {
954 ret = -EFAULT;
955 goto error;
956 }
957 eps[i] = ep_to_host_endpoint(ps->dev, ep);
958 if (!eps[i]) {
959 ret = -EINVAL;
960 goto error;
961 }
962
963 /* usb_alloc/free_streams operate on an usb_interface */
964 ifnum = findintfep(ps->dev, ep);
965 if (ifnum < 0) {
966 ret = ifnum;
967 goto error;
968 }
969
970 if (i == 0) {
971 ret = checkintf(ps, ifnum);
972 if (ret < 0)
973 goto error;
974 intf = usb_ifnum_to_if(ps->dev, ifnum);
975 } else {
976 /* Verify all eps belong to the same interface */
977 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
978 ret = -EINVAL;
979 goto error;
980 }
981 }
982 }
983
984 if (num_streams_ret)
985 *num_streams_ret = num_streams;
986 *num_eps_ret = num_eps;
987 *eps_ret = eps;
988 *intf_ret = intf;
989
990 return 0;
991
992error:
993 kfree(eps);
994 return ret;
995}
996
997static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
998{
999 struct device *dev;
1000
1001 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1002 if (!dev)
1003 return NULL;
1004 return to_usb_device(dev);
1005}
1006
1007/*
1008 * file operations
1009 */
1010static int usbdev_open(struct inode *inode, struct file *file)
1011{
1012 struct usb_device *dev = NULL;
1013 struct usb_dev_state *ps;
1014 int ret;
1015
1016 ret = -ENOMEM;
1017 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1018 if (!ps)
1019 goto out_free_ps;
1020
1021 ret = -ENODEV;
1022
1023 /* usbdev device-node */
1024 if (imajor(inode) == USB_DEVICE_MAJOR)
1025 dev = usbdev_lookup_by_devt(inode->i_rdev);
1026 if (!dev)
1027 goto out_free_ps;
1028
1029 usb_lock_device(dev);
1030 if (dev->state == USB_STATE_NOTATTACHED)
1031 goto out_unlock_device;
1032
1033 ret = usb_autoresume_device(dev);
1034 if (ret)
1035 goto out_unlock_device;
1036
1037 ps->dev = dev;
1038 ps->file = file;
1039 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1040 spin_lock_init(&ps->lock);
1041 INIT_LIST_HEAD(&ps->list);
1042 INIT_LIST_HEAD(&ps->async_pending);
1043 INIT_LIST_HEAD(&ps->async_completed);
1044 INIT_LIST_HEAD(&ps->memory_list);
1045 init_waitqueue_head(&ps->wait);
1046 init_waitqueue_head(&ps->wait_for_resume);
1047 ps->disc_pid = get_pid(task_pid(current));
1048 ps->cred = get_current_cred();
1049 smp_wmb();
1050
1051 /* Can't race with resume; the device is already active */
1052 list_add_tail(&ps->list, &dev->filelist);
1053 file->private_data = ps;
1054 usb_unlock_device(dev);
1055 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1056 current->comm);
1057 return ret;
1058
1059 out_unlock_device:
1060 usb_unlock_device(dev);
1061 usb_put_dev(dev);
1062 out_free_ps:
1063 kfree(ps);
1064 return ret;
1065}
1066
1067static int usbdev_release(struct inode *inode, struct file *file)
1068{
1069 struct usb_dev_state *ps = file->private_data;
1070 struct usb_device *dev = ps->dev;
1071 unsigned int ifnum;
1072 struct async *as;
1073
1074 usb_lock_device(dev);
1075 usb_hub_release_all_ports(dev, ps);
1076
1077 /* Protect against simultaneous resume */
1078 mutex_lock(&usbfs_mutex);
1079 list_del_init(&ps->list);
1080 mutex_unlock(&usbfs_mutex);
1081
1082 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1083 ifnum++) {
1084 if (test_bit(ifnum, &ps->ifclaimed))
1085 releaseintf(ps, ifnum);
1086 }
1087 destroy_all_async(ps);
1088 if (!ps->suspend_allowed)
1089 usb_autosuspend_device(dev);
1090 usb_unlock_device(dev);
1091 usb_put_dev(dev);
1092 put_pid(ps->disc_pid);
1093 put_cred(ps->cred);
1094
1095 as = async_getcompleted(ps);
1096 while (as) {
1097 free_async(as);
1098 as = async_getcompleted(ps);
1099 }
1100
1101 kfree(ps);
1102 return 0;
1103}
1104
1105static int do_proc_control(struct usb_dev_state *ps,
1106 struct usbdevfs_ctrltransfer *ctrl)
1107{
1108 struct usb_device *dev = ps->dev;
1109 unsigned int tmo;
1110 unsigned char *tbuf;
1111 unsigned wLength;
1112 int i, pipe, ret;
1113
1114 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1115 ctrl->wIndex);
1116 if (ret)
1117 return ret;
1118 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1119 if (wLength > PAGE_SIZE)
1120 return -EINVAL;
1121 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1122 sizeof(struct usb_ctrlrequest));
1123 if (ret)
1124 return ret;
1125 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1126 if (!tbuf) {
1127 ret = -ENOMEM;
1128 goto done;
1129 }
1130 tmo = ctrl->timeout;
1131 snoop(&dev->dev, "control urb: bRequestType=%02x "
1132 "bRequest=%02x wValue=%04x "
1133 "wIndex=%04x wLength=%04x\n",
1134 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1135 ctrl->wIndex, ctrl->wLength);
1136 if (ctrl->bRequestType & 0x80) {
1137 pipe = usb_rcvctrlpipe(dev, 0);
1138 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0);
1139
1140 usb_unlock_device(dev);
1141 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1142 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1143 tbuf, ctrl->wLength, tmo);
1144 usb_lock_device(dev);
1145 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1146 tbuf, max(i, 0));
1147 if ((i > 0) && ctrl->wLength) {
1148 if (copy_to_user(ctrl->data, tbuf, i)) {
1149 ret = -EFAULT;
1150 goto done;
1151 }
1152 }
1153 } else {
1154 if (ctrl->wLength) {
1155 if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) {
1156 ret = -EFAULT;
1157 goto done;
1158 }
1159 }
1160 pipe = usb_sndctrlpipe(dev, 0);
1161 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT,
1162 tbuf, ctrl->wLength);
1163
1164 usb_unlock_device(dev);
1165 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl->bRequest,
1166 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1167 tbuf, ctrl->wLength, tmo);
1168 usb_lock_device(dev);
1169 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1170 }
1171 if (i < 0 && i != -EPIPE) {
1172 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1173 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1174 current->comm, ctrl->bRequestType, ctrl->bRequest,
1175 ctrl->wLength, i);
1176 }
1177 ret = i;
1178 done:
1179 free_page((unsigned long) tbuf);
1180 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1181 sizeof(struct usb_ctrlrequest));
1182 return ret;
1183}
1184
1185static int proc_control(struct usb_dev_state *ps, void __user *arg)
1186{
1187 struct usbdevfs_ctrltransfer ctrl;
1188
1189 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1190 return -EFAULT;
1191 return do_proc_control(ps, &ctrl);
1192}
1193
1194static int do_proc_bulk(struct usb_dev_state *ps,
1195 struct usbdevfs_bulktransfer *bulk)
1196{
1197 struct usb_device *dev = ps->dev;
1198 unsigned int tmo, len1, pipe;
1199 int len2;
1200 unsigned char *tbuf;
1201 int i, ret;
1202
1203 ret = findintfep(ps->dev, bulk->ep);
1204 if (ret < 0)
1205 return ret;
1206 ret = checkintf(ps, ret);
1207 if (ret)
1208 return ret;
1209 if (bulk->ep & USB_DIR_IN)
1210 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1211 else
1212 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1213 if (!usb_maxpacket(dev, pipe, !(bulk->ep & USB_DIR_IN)))
1214 return -EINVAL;
1215 len1 = bulk->len;
1216 if (len1 >= (INT_MAX - sizeof(struct urb)))
1217 return -EINVAL;
1218 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1219 if (ret)
1220 return ret;
1221 tbuf = kmalloc(len1, GFP_KERNEL);
1222 if (!tbuf) {
1223 ret = -ENOMEM;
1224 goto done;
1225 }
1226 tmo = bulk->timeout;
1227 if (bulk->ep & 0x80) {
1228 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1229
1230 usb_unlock_device(dev);
1231 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1232 usb_lock_device(dev);
1233 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1234
1235 if (!i && len2) {
1236 if (copy_to_user(bulk->data, tbuf, len2)) {
1237 ret = -EFAULT;
1238 goto done;
1239 }
1240 }
1241 } else {
1242 if (len1) {
1243 if (copy_from_user(tbuf, bulk->data, len1)) {
1244 ret = -EFAULT;
1245 goto done;
1246 }
1247 }
1248 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1249
1250 usb_unlock_device(dev);
1251 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1252 usb_lock_device(dev);
1253 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1254 }
1255 ret = (i < 0 ? i : len2);
1256 done:
1257 kfree(tbuf);
1258 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1259 return ret;
1260}
1261
1262static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1263{
1264 struct usbdevfs_bulktransfer bulk;
1265
1266 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1267 return -EFAULT;
1268 return do_proc_bulk(ps, &bulk);
1269}
1270
1271static void check_reset_of_active_ep(struct usb_device *udev,
1272 unsigned int epnum, char *ioctl_name)
1273{
1274 struct usb_host_endpoint **eps;
1275 struct usb_host_endpoint *ep;
1276
1277 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1278 ep = eps[epnum & 0x0f];
1279 if (ep && !list_empty(&ep->urb_list))
1280 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1281 task_pid_nr(current), current->comm,
1282 ioctl_name, epnum);
1283}
1284
1285static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1286{
1287 unsigned int ep;
1288 int ret;
1289
1290 if (get_user(ep, (unsigned int __user *)arg))
1291 return -EFAULT;
1292 ret = findintfep(ps->dev, ep);
1293 if (ret < 0)
1294 return ret;
1295 ret = checkintf(ps, ret);
1296 if (ret)
1297 return ret;
1298 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1299 usb_reset_endpoint(ps->dev, ep);
1300 return 0;
1301}
1302
1303static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1304{
1305 unsigned int ep;
1306 int pipe;
1307 int ret;
1308
1309 if (get_user(ep, (unsigned int __user *)arg))
1310 return -EFAULT;
1311 ret = findintfep(ps->dev, ep);
1312 if (ret < 0)
1313 return ret;
1314 ret = checkintf(ps, ret);
1315 if (ret)
1316 return ret;
1317 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1318 if (ep & USB_DIR_IN)
1319 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1320 else
1321 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1322
1323 return usb_clear_halt(ps->dev, pipe);
1324}
1325
1326static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1327{
1328 struct usbdevfs_getdriver gd;
1329 struct usb_interface *intf;
1330 int ret;
1331
1332 if (copy_from_user(&gd, arg, sizeof(gd)))
1333 return -EFAULT;
1334 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1335 if (!intf || !intf->dev.driver)
1336 ret = -ENODATA;
1337 else {
1338 strlcpy(gd.driver, intf->dev.driver->name,
1339 sizeof(gd.driver));
1340 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1341 }
1342 return ret;
1343}
1344
1345static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1346{
1347 struct usbdevfs_connectinfo ci;
1348
1349 memset(&ci, 0, sizeof(ci));
1350 ci.devnum = ps->dev->devnum;
1351 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1352
1353 if (copy_to_user(arg, &ci, sizeof(ci)))
1354 return -EFAULT;
1355 return 0;
1356}
1357
1358static int proc_conninfo_ex(struct usb_dev_state *ps,
1359 void __user *arg, size_t size)
1360{
1361 struct usbdevfs_conninfo_ex ci;
1362 struct usb_device *udev = ps->dev;
1363
1364 if (size < sizeof(ci.size))
1365 return -EINVAL;
1366
1367 memset(&ci, 0, sizeof(ci));
1368 ci.size = sizeof(ci);
1369 ci.busnum = udev->bus->busnum;
1370 ci.devnum = udev->devnum;
1371 ci.speed = udev->speed;
1372
1373 while (udev && udev->portnum != 0) {
1374 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1375 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1376 udev->portnum;
1377 udev = udev->parent;
1378 }
1379
1380 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1381 memmove(&ci.ports[0],
1382 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1383 ci.num_ports);
1384
1385 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1386 return -EFAULT;
1387
1388 return 0;
1389}
1390
1391static int proc_resetdevice(struct usb_dev_state *ps)
1392{
1393 struct usb_host_config *actconfig = ps->dev->actconfig;
1394 struct usb_interface *interface;
1395 int i, number;
1396
1397 /* Don't allow a device reset if the process has dropped the
1398 * privilege to do such things and any of the interfaces are
1399 * currently claimed.
1400 */
1401 if (ps->privileges_dropped && actconfig) {
1402 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1403 interface = actconfig->interface[i];
1404 number = interface->cur_altsetting->desc.bInterfaceNumber;
1405 if (usb_interface_claimed(interface) &&
1406 !test_bit(number, &ps->ifclaimed)) {
1407 dev_warn(&ps->dev->dev,
1408 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1409 number, interface->dev.driver->name, current->comm);
1410 return -EACCES;
1411 }
1412 }
1413 }
1414
1415 return usb_reset_device(ps->dev);
1416}
1417
1418static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1419{
1420 struct usbdevfs_setinterface setintf;
1421 int ret;
1422
1423 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1424 return -EFAULT;
1425 ret = checkintf(ps, setintf.interface);
1426 if (ret)
1427 return ret;
1428
1429 destroy_async_on_interface(ps, setintf.interface);
1430
1431 return usb_set_interface(ps->dev, setintf.interface,
1432 setintf.altsetting);
1433}
1434
1435static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1436{
1437 int u;
1438 int status = 0;
1439 struct usb_host_config *actconfig;
1440
1441 if (get_user(u, (int __user *)arg))
1442 return -EFAULT;
1443
1444 actconfig = ps->dev->actconfig;
1445
1446 /* Don't touch the device if any interfaces are claimed.
1447 * It could interfere with other drivers' operations, and if
1448 * an interface is claimed by usbfs it could easily deadlock.
1449 */
1450 if (actconfig) {
1451 int i;
1452
1453 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1454 if (usb_interface_claimed(actconfig->interface[i])) {
1455 dev_warn(&ps->dev->dev,
1456 "usbfs: interface %d claimed by %s "
1457 "while '%s' sets config #%d\n",
1458 actconfig->interface[i]
1459 ->cur_altsetting
1460 ->desc.bInterfaceNumber,
1461 actconfig->interface[i]
1462 ->dev.driver->name,
1463 current->comm, u);
1464 status = -EBUSY;
1465 break;
1466 }
1467 }
1468 }
1469
1470 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1471 * so avoid usb_set_configuration()'s kick to sysfs
1472 */
1473 if (status == 0) {
1474 if (actconfig && actconfig->desc.bConfigurationValue == u)
1475 status = usb_reset_configuration(ps->dev);
1476 else
1477 status = usb_set_configuration(ps->dev, u);
1478 }
1479
1480 return status;
1481}
1482
1483static struct usb_memory *
1484find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1485{
1486 struct usb_memory *usbm = NULL, *iter;
1487 unsigned long flags;
1488 unsigned long uurb_start = (unsigned long)uurb->buffer;
1489
1490 spin_lock_irqsave(&ps->lock, flags);
1491 list_for_each_entry(iter, &ps->memory_list, memlist) {
1492 if (uurb_start >= iter->vm_start &&
1493 uurb_start < iter->vm_start + iter->size) {
1494 if (uurb->buffer_length > iter->vm_start + iter->size -
1495 uurb_start) {
1496 usbm = ERR_PTR(-EINVAL);
1497 } else {
1498 usbm = iter;
1499 usbm->urb_use_count++;
1500 }
1501 break;
1502 }
1503 }
1504 spin_unlock_irqrestore(&ps->lock, flags);
1505 return usbm;
1506}
1507
1508static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1509 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1510 void __user *arg, sigval_t userurb_sigval)
1511{
1512 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1513 struct usb_host_endpoint *ep;
1514 struct async *as = NULL;
1515 struct usb_ctrlrequest *dr = NULL;
1516 unsigned int u, totlen, isofrmlen;
1517 int i, ret, num_sgs = 0, ifnum = -1;
1518 int number_of_packets = 0;
1519 unsigned int stream_id = 0;
1520 void *buf;
1521 bool is_in;
1522 bool allow_short = false;
1523 bool allow_zero = false;
1524 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1525 USBDEVFS_URB_BULK_CONTINUATION |
1526 USBDEVFS_URB_NO_FSBR |
1527 USBDEVFS_URB_ZERO_PACKET |
1528 USBDEVFS_URB_NO_INTERRUPT;
1529 /* USBDEVFS_URB_ISO_ASAP is a special case */
1530 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1531 mask |= USBDEVFS_URB_ISO_ASAP;
1532
1533 if (uurb->flags & ~mask)
1534 return -EINVAL;
1535
1536 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1537 return -EINVAL;
1538 if (uurb->buffer_length > 0 && !uurb->buffer)
1539 return -EINVAL;
1540 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1541 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1542 ifnum = findintfep(ps->dev, uurb->endpoint);
1543 if (ifnum < 0)
1544 return ifnum;
1545 ret = checkintf(ps, ifnum);
1546 if (ret)
1547 return ret;
1548 }
1549 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1550 if (!ep)
1551 return -ENOENT;
1552 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1553
1554 u = 0;
1555 switch (uurb->type) {
1556 case USBDEVFS_URB_TYPE_CONTROL:
1557 if (!usb_endpoint_xfer_control(&ep->desc))
1558 return -EINVAL;
1559 /* min 8 byte setup packet */
1560 if (uurb->buffer_length < 8)
1561 return -EINVAL;
1562 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1563 if (!dr)
1564 return -ENOMEM;
1565 if (copy_from_user(dr, uurb->buffer, 8)) {
1566 ret = -EFAULT;
1567 goto error;
1568 }
1569 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1570 ret = -EINVAL;
1571 goto error;
1572 }
1573 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1574 le16_to_cpu(dr->wIndex));
1575 if (ret)
1576 goto error;
1577 uurb->buffer_length = le16_to_cpu(dr->wLength);
1578 uurb->buffer += 8;
1579 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1580 is_in = true;
1581 uurb->endpoint |= USB_DIR_IN;
1582 } else {
1583 is_in = false;
1584 uurb->endpoint &= ~USB_DIR_IN;
1585 }
1586 if (is_in)
1587 allow_short = true;
1588 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1589 "bRequest=%02x wValue=%04x "
1590 "wIndex=%04x wLength=%04x\n",
1591 dr->bRequestType, dr->bRequest,
1592 __le16_to_cpu(dr->wValue),
1593 __le16_to_cpu(dr->wIndex),
1594 __le16_to_cpu(dr->wLength));
1595 u = sizeof(struct usb_ctrlrequest);
1596 break;
1597
1598 case USBDEVFS_URB_TYPE_BULK:
1599 if (!is_in)
1600 allow_zero = true;
1601 else
1602 allow_short = true;
1603 switch (usb_endpoint_type(&ep->desc)) {
1604 case USB_ENDPOINT_XFER_CONTROL:
1605 case USB_ENDPOINT_XFER_ISOC:
1606 return -EINVAL;
1607 case USB_ENDPOINT_XFER_INT:
1608 /* allow single-shot interrupt transfers */
1609 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1610 goto interrupt_urb;
1611 }
1612 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1613 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1614 num_sgs = 0;
1615 if (ep->streams)
1616 stream_id = uurb->stream_id;
1617 break;
1618
1619 case USBDEVFS_URB_TYPE_INTERRUPT:
1620 if (!usb_endpoint_xfer_int(&ep->desc))
1621 return -EINVAL;
1622 interrupt_urb:
1623 if (!is_in)
1624 allow_zero = true;
1625 else
1626 allow_short = true;
1627 break;
1628
1629 case USBDEVFS_URB_TYPE_ISO:
1630 /* arbitrary limit */
1631 if (uurb->number_of_packets < 1 ||
1632 uurb->number_of_packets > 128)
1633 return -EINVAL;
1634 if (!usb_endpoint_xfer_isoc(&ep->desc))
1635 return -EINVAL;
1636 number_of_packets = uurb->number_of_packets;
1637 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1638 number_of_packets;
1639 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1640 if (IS_ERR(isopkt)) {
1641 ret = PTR_ERR(isopkt);
1642 isopkt = NULL;
1643 goto error;
1644 }
1645 for (totlen = u = 0; u < number_of_packets; u++) {
1646 /*
1647 * arbitrary limit need for USB 3.1 Gen2
1648 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1649 */
1650 if (isopkt[u].length > 98304) {
1651 ret = -EINVAL;
1652 goto error;
1653 }
1654 totlen += isopkt[u].length;
1655 }
1656 u *= sizeof(struct usb_iso_packet_descriptor);
1657 uurb->buffer_length = totlen;
1658 break;
1659
1660 default:
1661 return -EINVAL;
1662 }
1663
1664 if (uurb->buffer_length > 0 &&
1665 !access_ok(uurb->buffer, uurb->buffer_length)) {
1666 ret = -EFAULT;
1667 goto error;
1668 }
1669 as = alloc_async(number_of_packets);
1670 if (!as) {
1671 ret = -ENOMEM;
1672 goto error;
1673 }
1674
1675 as->usbm = find_memory_area(ps, uurb);
1676 if (IS_ERR(as->usbm)) {
1677 ret = PTR_ERR(as->usbm);
1678 as->usbm = NULL;
1679 goto error;
1680 }
1681
1682 /* do not use SG buffers when memory mapped segments
1683 * are in use
1684 */
1685 if (as->usbm)
1686 num_sgs = 0;
1687
1688 u += sizeof(struct async) + sizeof(struct urb) +
1689 (as->usbm ? 0 : uurb->buffer_length) +
1690 num_sgs * sizeof(struct scatterlist);
1691 ret = usbfs_increase_memory_usage(u);
1692 if (ret)
1693 goto error;
1694 as->mem_usage = u;
1695
1696 if (num_sgs) {
1697 as->urb->sg = kmalloc_array(num_sgs,
1698 sizeof(struct scatterlist),
1699 GFP_KERNEL);
1700 if (!as->urb->sg) {
1701 ret = -ENOMEM;
1702 goto error;
1703 }
1704 as->urb->num_sgs = num_sgs;
1705 sg_init_table(as->urb->sg, as->urb->num_sgs);
1706
1707 totlen = uurb->buffer_length;
1708 for (i = 0; i < as->urb->num_sgs; i++) {
1709 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1710 buf = kmalloc(u, GFP_KERNEL);
1711 if (!buf) {
1712 ret = -ENOMEM;
1713 goto error;
1714 }
1715 sg_set_buf(&as->urb->sg[i], buf, u);
1716
1717 if (!is_in) {
1718 if (copy_from_user(buf, uurb->buffer, u)) {
1719 ret = -EFAULT;
1720 goto error;
1721 }
1722 uurb->buffer += u;
1723 }
1724 totlen -= u;
1725 }
1726 } else if (uurb->buffer_length > 0) {
1727 if (as->usbm) {
1728 unsigned long uurb_start = (unsigned long)uurb->buffer;
1729
1730 as->urb->transfer_buffer = as->usbm->mem +
1731 (uurb_start - as->usbm->vm_start);
1732 } else {
1733 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1734 GFP_KERNEL);
1735 if (!as->urb->transfer_buffer) {
1736 ret = -ENOMEM;
1737 goto error;
1738 }
1739 if (!is_in) {
1740 if (copy_from_user(as->urb->transfer_buffer,
1741 uurb->buffer,
1742 uurb->buffer_length)) {
1743 ret = -EFAULT;
1744 goto error;
1745 }
1746 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1747 /*
1748 * Isochronous input data may end up being
1749 * discontiguous if some of the packets are
1750 * short. Clear the buffer so that the gaps
1751 * don't leak kernel data to userspace.
1752 */
1753 memset(as->urb->transfer_buffer, 0,
1754 uurb->buffer_length);
1755 }
1756 }
1757 }
1758 as->urb->dev = ps->dev;
1759 as->urb->pipe = (uurb->type << 30) |
1760 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1761 (uurb->endpoint & USB_DIR_IN);
1762
1763 /* This tedious sequence is necessary because the URB_* flags
1764 * are internal to the kernel and subject to change, whereas
1765 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1766 */
1767 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1768 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1769 u |= URB_ISO_ASAP;
1770 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1771 u |= URB_SHORT_NOT_OK;
1772 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1773 u |= URB_ZERO_PACKET;
1774 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1775 u |= URB_NO_INTERRUPT;
1776 as->urb->transfer_flags = u;
1777
1778 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1779 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1780 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1781 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1782
1783 as->urb->transfer_buffer_length = uurb->buffer_length;
1784 as->urb->setup_packet = (unsigned char *)dr;
1785 dr = NULL;
1786 as->urb->start_frame = uurb->start_frame;
1787 as->urb->number_of_packets = number_of_packets;
1788 as->urb->stream_id = stream_id;
1789
1790 if (ep->desc.bInterval) {
1791 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1792 ps->dev->speed == USB_SPEED_HIGH ||
1793 ps->dev->speed >= USB_SPEED_SUPER)
1794 as->urb->interval = 1 <<
1795 min(15, ep->desc.bInterval - 1);
1796 else
1797 as->urb->interval = ep->desc.bInterval;
1798 }
1799
1800 as->urb->context = as;
1801 as->urb->complete = async_completed;
1802 for (totlen = u = 0; u < number_of_packets; u++) {
1803 as->urb->iso_frame_desc[u].offset = totlen;
1804 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1805 totlen += isopkt[u].length;
1806 }
1807 kfree(isopkt);
1808 isopkt = NULL;
1809 as->ps = ps;
1810 as->userurb = arg;
1811 as->userurb_sigval = userurb_sigval;
1812 if (as->usbm) {
1813 unsigned long uurb_start = (unsigned long)uurb->buffer;
1814
1815 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1816 as->urb->transfer_dma = as->usbm->dma_handle +
1817 (uurb_start - as->usbm->vm_start);
1818 } else if (is_in && uurb->buffer_length > 0)
1819 as->userbuffer = uurb->buffer;
1820 as->signr = uurb->signr;
1821 as->ifnum = ifnum;
1822 as->pid = get_pid(task_pid(current));
1823 as->cred = get_current_cred();
1824 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1825 as->urb->transfer_buffer_length, 0, SUBMIT,
1826 NULL, 0);
1827 if (!is_in)
1828 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1829
1830 async_newpending(as);
1831
1832 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1833 spin_lock_irq(&ps->lock);
1834
1835 /* Not exactly the endpoint address; the direction bit is
1836 * shifted to the 0x10 position so that the value will be
1837 * between 0 and 31.
1838 */
1839 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1840 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1841 >> 3);
1842
1843 /* If this bulk URB is the start of a new transfer, re-enable
1844 * the endpoint. Otherwise mark it as a continuation URB.
1845 */
1846 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1847 as->bulk_status = AS_CONTINUATION;
1848 else
1849 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1850
1851 /* Don't accept continuation URBs if the endpoint is
1852 * disabled because of an earlier error.
1853 */
1854 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1855 ret = -EREMOTEIO;
1856 else
1857 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1858 spin_unlock_irq(&ps->lock);
1859 } else {
1860 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1861 }
1862
1863 if (ret) {
1864 dev_printk(KERN_DEBUG, &ps->dev->dev,
1865 "usbfs: usb_submit_urb returned %d\n", ret);
1866 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1867 0, ret, COMPLETE, NULL, 0);
1868 async_removepending(as);
1869 goto error;
1870 }
1871 return 0;
1872
1873 error:
1874 kfree(isopkt);
1875 kfree(dr);
1876 if (as)
1877 free_async(as);
1878 return ret;
1879}
1880
1881static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1882{
1883 struct usbdevfs_urb uurb;
1884 sigval_t userurb_sigval;
1885
1886 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1887 return -EFAULT;
1888
1889 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1890 userurb_sigval.sival_ptr = arg;
1891
1892 return proc_do_submiturb(ps, &uurb,
1893 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1894 arg, userurb_sigval);
1895}
1896
1897static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1898{
1899 struct urb *urb;
1900 struct async *as;
1901 unsigned long flags;
1902
1903 spin_lock_irqsave(&ps->lock, flags);
1904 as = async_getpending(ps, arg);
1905 if (!as) {
1906 spin_unlock_irqrestore(&ps->lock, flags);
1907 return -EINVAL;
1908 }
1909
1910 urb = as->urb;
1911 usb_get_urb(urb);
1912 spin_unlock_irqrestore(&ps->lock, flags);
1913
1914 usb_kill_urb(urb);
1915 usb_put_urb(urb);
1916
1917 return 0;
1918}
1919
1920static void compute_isochronous_actual_length(struct urb *urb)
1921{
1922 unsigned int i;
1923
1924 if (urb->number_of_packets > 0) {
1925 urb->actual_length = 0;
1926 for (i = 0; i < urb->number_of_packets; i++)
1927 urb->actual_length +=
1928 urb->iso_frame_desc[i].actual_length;
1929 }
1930}
1931
1932static int processcompl(struct async *as, void __user * __user *arg)
1933{
1934 struct urb *urb = as->urb;
1935 struct usbdevfs_urb __user *userurb = as->userurb;
1936 void __user *addr = as->userurb;
1937 unsigned int i;
1938
1939 compute_isochronous_actual_length(urb);
1940 if (as->userbuffer && urb->actual_length) {
1941 if (copy_urb_data_to_user(as->userbuffer, urb))
1942 goto err_out;
1943 }
1944 if (put_user(as->status, &userurb->status))
1945 goto err_out;
1946 if (put_user(urb->actual_length, &userurb->actual_length))
1947 goto err_out;
1948 if (put_user(urb->error_count, &userurb->error_count))
1949 goto err_out;
1950
1951 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1952 for (i = 0; i < urb->number_of_packets; i++) {
1953 if (put_user(urb->iso_frame_desc[i].actual_length,
1954 &userurb->iso_frame_desc[i].actual_length))
1955 goto err_out;
1956 if (put_user(urb->iso_frame_desc[i].status,
1957 &userurb->iso_frame_desc[i].status))
1958 goto err_out;
1959 }
1960 }
1961
1962 if (put_user(addr, (void __user * __user *)arg))
1963 return -EFAULT;
1964 return 0;
1965
1966err_out:
1967 return -EFAULT;
1968}
1969
1970static struct async *reap_as(struct usb_dev_state *ps)
1971{
1972 DECLARE_WAITQUEUE(wait, current);
1973 struct async *as = NULL;
1974 struct usb_device *dev = ps->dev;
1975
1976 add_wait_queue(&ps->wait, &wait);
1977 for (;;) {
1978 __set_current_state(TASK_INTERRUPTIBLE);
1979 as = async_getcompleted(ps);
1980 if (as || !connected(ps))
1981 break;
1982 if (signal_pending(current))
1983 break;
1984 usb_unlock_device(dev);
1985 schedule();
1986 usb_lock_device(dev);
1987 }
1988 remove_wait_queue(&ps->wait, &wait);
1989 set_current_state(TASK_RUNNING);
1990 return as;
1991}
1992
1993static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1994{
1995 struct async *as = reap_as(ps);
1996
1997 if (as) {
1998 int retval;
1999
2000 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2001 retval = processcompl(as, (void __user * __user *)arg);
2002 free_async(as);
2003 return retval;
2004 }
2005 if (signal_pending(current))
2006 return -EINTR;
2007 return -ENODEV;
2008}
2009
2010static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2011{
2012 int retval;
2013 struct async *as;
2014
2015 as = async_getcompleted(ps);
2016 if (as) {
2017 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2018 retval = processcompl(as, (void __user * __user *)arg);
2019 free_async(as);
2020 } else {
2021 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2022 }
2023 return retval;
2024}
2025
2026#ifdef CONFIG_COMPAT
2027static int proc_control_compat(struct usb_dev_state *ps,
2028 struct usbdevfs_ctrltransfer32 __user *p32)
2029{
2030 struct usbdevfs_ctrltransfer ctrl;
2031 u32 udata;
2032
2033 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2034 get_user(udata, &p32->data))
2035 return -EFAULT;
2036 ctrl.data = compat_ptr(udata);
2037 return do_proc_control(ps, &ctrl);
2038}
2039
2040static int proc_bulk_compat(struct usb_dev_state *ps,
2041 struct usbdevfs_bulktransfer32 __user *p32)
2042{
2043 struct usbdevfs_bulktransfer bulk;
2044 compat_caddr_t addr;
2045
2046 if (get_user(bulk.ep, &p32->ep) ||
2047 get_user(bulk.len, &p32->len) ||
2048 get_user(bulk.timeout, &p32->timeout) ||
2049 get_user(addr, &p32->data))
2050 return -EFAULT;
2051 bulk.data = compat_ptr(addr);
2052 return do_proc_bulk(ps, &bulk);
2053}
2054
2055static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2056{
2057 struct usbdevfs_disconnectsignal32 ds;
2058
2059 if (copy_from_user(&ds, arg, sizeof(ds)))
2060 return -EFAULT;
2061 ps->discsignr = ds.signr;
2062 ps->disccontext.sival_int = ds.context;
2063 return 0;
2064}
2065
2066static int get_urb32(struct usbdevfs_urb *kurb,
2067 struct usbdevfs_urb32 __user *uurb)
2068{
2069 struct usbdevfs_urb32 urb32;
2070 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2071 return -EFAULT;
2072 kurb->type = urb32.type;
2073 kurb->endpoint = urb32.endpoint;
2074 kurb->status = urb32.status;
2075 kurb->flags = urb32.flags;
2076 kurb->buffer = compat_ptr(urb32.buffer);
2077 kurb->buffer_length = urb32.buffer_length;
2078 kurb->actual_length = urb32.actual_length;
2079 kurb->start_frame = urb32.start_frame;
2080 kurb->number_of_packets = urb32.number_of_packets;
2081 kurb->error_count = urb32.error_count;
2082 kurb->signr = urb32.signr;
2083 kurb->usercontext = compat_ptr(urb32.usercontext);
2084 return 0;
2085}
2086
2087static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2088{
2089 struct usbdevfs_urb uurb;
2090 sigval_t userurb_sigval;
2091
2092 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2093 return -EFAULT;
2094
2095 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2096 userurb_sigval.sival_int = ptr_to_compat(arg);
2097
2098 return proc_do_submiturb(ps, &uurb,
2099 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2100 arg, userurb_sigval);
2101}
2102
2103static int processcompl_compat(struct async *as, void __user * __user *arg)
2104{
2105 struct urb *urb = as->urb;
2106 struct usbdevfs_urb32 __user *userurb = as->userurb;
2107 void __user *addr = as->userurb;
2108 unsigned int i;
2109
2110 compute_isochronous_actual_length(urb);
2111 if (as->userbuffer && urb->actual_length) {
2112 if (copy_urb_data_to_user(as->userbuffer, urb))
2113 return -EFAULT;
2114 }
2115 if (put_user(as->status, &userurb->status))
2116 return -EFAULT;
2117 if (put_user(urb->actual_length, &userurb->actual_length))
2118 return -EFAULT;
2119 if (put_user(urb->error_count, &userurb->error_count))
2120 return -EFAULT;
2121
2122 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2123 for (i = 0; i < urb->number_of_packets; i++) {
2124 if (put_user(urb->iso_frame_desc[i].actual_length,
2125 &userurb->iso_frame_desc[i].actual_length))
2126 return -EFAULT;
2127 if (put_user(urb->iso_frame_desc[i].status,
2128 &userurb->iso_frame_desc[i].status))
2129 return -EFAULT;
2130 }
2131 }
2132
2133 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2134 return -EFAULT;
2135 return 0;
2136}
2137
2138static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2139{
2140 struct async *as = reap_as(ps);
2141
2142 if (as) {
2143 int retval;
2144
2145 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2146 retval = processcompl_compat(as, (void __user * __user *)arg);
2147 free_async(as);
2148 return retval;
2149 }
2150 if (signal_pending(current))
2151 return -EINTR;
2152 return -ENODEV;
2153}
2154
2155static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2156{
2157 int retval;
2158 struct async *as;
2159
2160 as = async_getcompleted(ps);
2161 if (as) {
2162 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2163 retval = processcompl_compat(as, (void __user * __user *)arg);
2164 free_async(as);
2165 } else {
2166 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2167 }
2168 return retval;
2169}
2170
2171
2172#endif
2173
2174static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2175{
2176 struct usbdevfs_disconnectsignal ds;
2177
2178 if (copy_from_user(&ds, arg, sizeof(ds)))
2179 return -EFAULT;
2180 ps->discsignr = ds.signr;
2181 ps->disccontext.sival_ptr = ds.context;
2182 return 0;
2183}
2184
2185static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2186{
2187 unsigned int ifnum;
2188
2189 if (get_user(ifnum, (unsigned int __user *)arg))
2190 return -EFAULT;
2191 return claimintf(ps, ifnum);
2192}
2193
2194static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2195{
2196 unsigned int ifnum;
2197 int ret;
2198
2199 if (get_user(ifnum, (unsigned int __user *)arg))
2200 return -EFAULT;
2201 ret = releaseintf(ps, ifnum);
2202 if (ret < 0)
2203 return ret;
2204 destroy_async_on_interface(ps, ifnum);
2205 return 0;
2206}
2207
2208static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2209{
2210 int size;
2211 void *buf = NULL;
2212 int retval = 0;
2213 struct usb_interface *intf = NULL;
2214 struct usb_driver *driver = NULL;
2215
2216 if (ps->privileges_dropped)
2217 return -EACCES;
2218
2219 if (!connected(ps))
2220 return -ENODEV;
2221
2222 /* alloc buffer */
2223 size = _IOC_SIZE(ctl->ioctl_code);
2224 if (size > 0) {
2225 buf = kmalloc(size, GFP_KERNEL);
2226 if (buf == NULL)
2227 return -ENOMEM;
2228 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2229 if (copy_from_user(buf, ctl->data, size)) {
2230 kfree(buf);
2231 return -EFAULT;
2232 }
2233 } else {
2234 memset(buf, 0, size);
2235 }
2236 }
2237
2238 if (ps->dev->state != USB_STATE_CONFIGURED)
2239 retval = -EHOSTUNREACH;
2240 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2241 retval = -EINVAL;
2242 else switch (ctl->ioctl_code) {
2243
2244 /* disconnect kernel driver from interface */
2245 case USBDEVFS_DISCONNECT:
2246 if (intf->dev.driver) {
2247 driver = to_usb_driver(intf->dev.driver);
2248 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2249 usb_driver_release_interface(driver, intf);
2250 } else
2251 retval = -ENODATA;
2252 break;
2253
2254 /* let kernel drivers try to (re)bind to the interface */
2255 case USBDEVFS_CONNECT:
2256 if (!intf->dev.driver)
2257 retval = device_attach(&intf->dev);
2258 else
2259 retval = -EBUSY;
2260 break;
2261
2262 /* talk directly to the interface's driver */
2263 default:
2264 if (intf->dev.driver)
2265 driver = to_usb_driver(intf->dev.driver);
2266 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2267 retval = -ENOTTY;
2268 } else {
2269 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2270 if (retval == -ENOIOCTLCMD)
2271 retval = -ENOTTY;
2272 }
2273 }
2274
2275 /* cleanup and return */
2276 if (retval >= 0
2277 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2278 && size > 0
2279 && copy_to_user(ctl->data, buf, size) != 0)
2280 retval = -EFAULT;
2281
2282 kfree(buf);
2283 return retval;
2284}
2285
2286static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2287{
2288 struct usbdevfs_ioctl ctrl;
2289
2290 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2291 return -EFAULT;
2292 return proc_ioctl(ps, &ctrl);
2293}
2294
2295#ifdef CONFIG_COMPAT
2296static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2297{
2298 struct usbdevfs_ioctl32 ioc32;
2299 struct usbdevfs_ioctl ctrl;
2300
2301 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2302 return -EFAULT;
2303 ctrl.ifno = ioc32.ifno;
2304 ctrl.ioctl_code = ioc32.ioctl_code;
2305 ctrl.data = compat_ptr(ioc32.data);
2306 return proc_ioctl(ps, &ctrl);
2307}
2308#endif
2309
2310static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2311{
2312 unsigned portnum;
2313 int rc;
2314
2315 if (get_user(portnum, (unsigned __user *) arg))
2316 return -EFAULT;
2317 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2318 if (rc == 0)
2319 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2320 portnum, task_pid_nr(current), current->comm);
2321 return rc;
2322}
2323
2324static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2325{
2326 unsigned portnum;
2327
2328 if (get_user(portnum, (unsigned __user *) arg))
2329 return -EFAULT;
2330 return usb_hub_release_port(ps->dev, portnum, ps);
2331}
2332
2333static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2334{
2335 __u32 caps;
2336
2337 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2338 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2339 USBDEVFS_CAP_DROP_PRIVILEGES |
2340 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2341 if (!ps->dev->bus->no_stop_on_short)
2342 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2343 if (ps->dev->bus->sg_tablesize)
2344 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2345
2346 if (put_user(caps, (__u32 __user *)arg))
2347 return -EFAULT;
2348
2349 return 0;
2350}
2351
2352static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2353{
2354 struct usbdevfs_disconnect_claim dc;
2355 struct usb_interface *intf;
2356
2357 if (copy_from_user(&dc, arg, sizeof(dc)))
2358 return -EFAULT;
2359
2360 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2361 if (!intf)
2362 return -EINVAL;
2363
2364 if (intf->dev.driver) {
2365 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2366
2367 if (ps->privileges_dropped)
2368 return -EACCES;
2369
2370 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2371 strncmp(dc.driver, intf->dev.driver->name,
2372 sizeof(dc.driver)) != 0)
2373 return -EBUSY;
2374
2375 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2376 strncmp(dc.driver, intf->dev.driver->name,
2377 sizeof(dc.driver)) == 0)
2378 return -EBUSY;
2379
2380 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2381 usb_driver_release_interface(driver, intf);
2382 }
2383
2384 return claimintf(ps, dc.interface);
2385}
2386
2387static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2388{
2389 unsigned num_streams, num_eps;
2390 struct usb_host_endpoint **eps;
2391 struct usb_interface *intf;
2392 int r;
2393
2394 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2395 &eps, &intf);
2396 if (r)
2397 return r;
2398
2399 destroy_async_on_interface(ps,
2400 intf->altsetting[0].desc.bInterfaceNumber);
2401
2402 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2403 kfree(eps);
2404 return r;
2405}
2406
2407static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2408{
2409 unsigned num_eps;
2410 struct usb_host_endpoint **eps;
2411 struct usb_interface *intf;
2412 int r;
2413
2414 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2415 if (r)
2416 return r;
2417
2418 destroy_async_on_interface(ps,
2419 intf->altsetting[0].desc.bInterfaceNumber);
2420
2421 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2422 kfree(eps);
2423 return r;
2424}
2425
2426static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2427{
2428 u32 data;
2429
2430 if (copy_from_user(&data, arg, sizeof(data)))
2431 return -EFAULT;
2432
2433 /* This is a one way operation. Once privileges are
2434 * dropped, you cannot regain them. You may however reissue
2435 * this ioctl to shrink the allowed interfaces mask.
2436 */
2437 ps->interface_allowed_mask &= data;
2438 ps->privileges_dropped = true;
2439
2440 return 0;
2441}
2442
2443static int proc_forbid_suspend(struct usb_dev_state *ps)
2444{
2445 int ret = 0;
2446
2447 if (ps->suspend_allowed) {
2448 ret = usb_autoresume_device(ps->dev);
2449 if (ret == 0)
2450 ps->suspend_allowed = false;
2451 else if (ret != -ENODEV)
2452 ret = -EIO;
2453 }
2454 return ret;
2455}
2456
2457static int proc_allow_suspend(struct usb_dev_state *ps)
2458{
2459 if (!connected(ps))
2460 return -ENODEV;
2461
2462 WRITE_ONCE(ps->not_yet_resumed, 1);
2463 if (!ps->suspend_allowed) {
2464 usb_autosuspend_device(ps->dev);
2465 ps->suspend_allowed = true;
2466 }
2467 return 0;
2468}
2469
2470static int proc_wait_for_resume(struct usb_dev_state *ps)
2471{
2472 int ret;
2473
2474 usb_unlock_device(ps->dev);
2475 ret = wait_event_interruptible(ps->wait_for_resume,
2476 READ_ONCE(ps->not_yet_resumed) == 0);
2477 usb_lock_device(ps->dev);
2478
2479 if (ret != 0)
2480 return -EINTR;
2481 return proc_forbid_suspend(ps);
2482}
2483
2484/*
2485 * NOTE: All requests here that have interface numbers as parameters
2486 * are assuming that somehow the configuration has been prevented from
2487 * changing. But there's no mechanism to ensure that...
2488 */
2489static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2490 void __user *p)
2491{
2492 struct usb_dev_state *ps = file->private_data;
2493 struct inode *inode = file_inode(file);
2494 struct usb_device *dev = ps->dev;
2495 int ret = -ENOTTY;
2496
2497 if (!(file->f_mode & FMODE_WRITE))
2498 return -EPERM;
2499
2500 usb_lock_device(dev);
2501
2502 /* Reap operations are allowed even after disconnection */
2503 switch (cmd) {
2504 case USBDEVFS_REAPURB:
2505 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2506 ret = proc_reapurb(ps, p);
2507 goto done;
2508
2509 case USBDEVFS_REAPURBNDELAY:
2510 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2511 ret = proc_reapurbnonblock(ps, p);
2512 goto done;
2513
2514#ifdef CONFIG_COMPAT
2515 case USBDEVFS_REAPURB32:
2516 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2517 ret = proc_reapurb_compat(ps, p);
2518 goto done;
2519
2520 case USBDEVFS_REAPURBNDELAY32:
2521 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2522 ret = proc_reapurbnonblock_compat(ps, p);
2523 goto done;
2524#endif
2525 }
2526
2527 if (!connected(ps)) {
2528 usb_unlock_device(dev);
2529 return -ENODEV;
2530 }
2531
2532 switch (cmd) {
2533 case USBDEVFS_CONTROL:
2534 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2535 ret = proc_control(ps, p);
2536 if (ret >= 0)
2537 inode->i_mtime = current_time(inode);
2538 break;
2539
2540 case USBDEVFS_BULK:
2541 snoop(&dev->dev, "%s: BULK\n", __func__);
2542 ret = proc_bulk(ps, p);
2543 if (ret >= 0)
2544 inode->i_mtime = current_time(inode);
2545 break;
2546
2547 case USBDEVFS_RESETEP:
2548 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2549 ret = proc_resetep(ps, p);
2550 if (ret >= 0)
2551 inode->i_mtime = current_time(inode);
2552 break;
2553
2554 case USBDEVFS_RESET:
2555 snoop(&dev->dev, "%s: RESET\n", __func__);
2556 ret = proc_resetdevice(ps);
2557 break;
2558
2559 case USBDEVFS_CLEAR_HALT:
2560 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2561 ret = proc_clearhalt(ps, p);
2562 if (ret >= 0)
2563 inode->i_mtime = current_time(inode);
2564 break;
2565
2566 case USBDEVFS_GETDRIVER:
2567 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2568 ret = proc_getdriver(ps, p);
2569 break;
2570
2571 case USBDEVFS_CONNECTINFO:
2572 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2573 ret = proc_connectinfo(ps, p);
2574 break;
2575
2576 case USBDEVFS_SETINTERFACE:
2577 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2578 ret = proc_setintf(ps, p);
2579 break;
2580
2581 case USBDEVFS_SETCONFIGURATION:
2582 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2583 ret = proc_setconfig(ps, p);
2584 break;
2585
2586 case USBDEVFS_SUBMITURB:
2587 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2588 ret = proc_submiturb(ps, p);
2589 if (ret >= 0)
2590 inode->i_mtime = current_time(inode);
2591 break;
2592
2593#ifdef CONFIG_COMPAT
2594 case USBDEVFS_CONTROL32:
2595 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2596 ret = proc_control_compat(ps, p);
2597 if (ret >= 0)
2598 inode->i_mtime = current_time(inode);
2599 break;
2600
2601 case USBDEVFS_BULK32:
2602 snoop(&dev->dev, "%s: BULK32\n", __func__);
2603 ret = proc_bulk_compat(ps, p);
2604 if (ret >= 0)
2605 inode->i_mtime = current_time(inode);
2606 break;
2607
2608 case USBDEVFS_DISCSIGNAL32:
2609 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2610 ret = proc_disconnectsignal_compat(ps, p);
2611 break;
2612
2613 case USBDEVFS_SUBMITURB32:
2614 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2615 ret = proc_submiturb_compat(ps, p);
2616 if (ret >= 0)
2617 inode->i_mtime = current_time(inode);
2618 break;
2619
2620 case USBDEVFS_IOCTL32:
2621 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2622 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2623 break;
2624#endif
2625
2626 case USBDEVFS_DISCARDURB:
2627 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2628 ret = proc_unlinkurb(ps, p);
2629 break;
2630
2631 case USBDEVFS_DISCSIGNAL:
2632 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2633 ret = proc_disconnectsignal(ps, p);
2634 break;
2635
2636 case USBDEVFS_CLAIMINTERFACE:
2637 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2638 ret = proc_claiminterface(ps, p);
2639 break;
2640
2641 case USBDEVFS_RELEASEINTERFACE:
2642 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2643 ret = proc_releaseinterface(ps, p);
2644 break;
2645
2646 case USBDEVFS_IOCTL:
2647 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2648 ret = proc_ioctl_default(ps, p);
2649 break;
2650
2651 case USBDEVFS_CLAIM_PORT:
2652 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2653 ret = proc_claim_port(ps, p);
2654 break;
2655
2656 case USBDEVFS_RELEASE_PORT:
2657 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2658 ret = proc_release_port(ps, p);
2659 break;
2660 case USBDEVFS_GET_CAPABILITIES:
2661 ret = proc_get_capabilities(ps, p);
2662 break;
2663 case USBDEVFS_DISCONNECT_CLAIM:
2664 ret = proc_disconnect_claim(ps, p);
2665 break;
2666 case USBDEVFS_ALLOC_STREAMS:
2667 ret = proc_alloc_streams(ps, p);
2668 break;
2669 case USBDEVFS_FREE_STREAMS:
2670 ret = proc_free_streams(ps, p);
2671 break;
2672 case USBDEVFS_DROP_PRIVILEGES:
2673 ret = proc_drop_privileges(ps, p);
2674 break;
2675 case USBDEVFS_GET_SPEED:
2676 ret = ps->dev->speed;
2677 break;
2678 case USBDEVFS_FORBID_SUSPEND:
2679 ret = proc_forbid_suspend(ps);
2680 break;
2681 case USBDEVFS_ALLOW_SUSPEND:
2682 ret = proc_allow_suspend(ps);
2683 break;
2684 case USBDEVFS_WAIT_FOR_RESUME:
2685 ret = proc_wait_for_resume(ps);
2686 break;
2687 }
2688
2689 /* Handle variable-length commands */
2690 switch (cmd & ~IOCSIZE_MASK) {
2691 case USBDEVFS_CONNINFO_EX(0):
2692 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2693 break;
2694 }
2695
2696 done:
2697 usb_unlock_device(dev);
2698 if (ret >= 0)
2699 inode->i_atime = current_time(inode);
2700 return ret;
2701}
2702
2703static long usbdev_ioctl(struct file *file, unsigned int cmd,
2704 unsigned long arg)
2705{
2706 int ret;
2707
2708 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2709
2710 return ret;
2711}
2712
2713/* No kernel lock - fine */
2714static __poll_t usbdev_poll(struct file *file,
2715 struct poll_table_struct *wait)
2716{
2717 struct usb_dev_state *ps = file->private_data;
2718 __poll_t mask = 0;
2719
2720 poll_wait(file, &ps->wait, wait);
2721 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2722 mask |= EPOLLOUT | EPOLLWRNORM;
2723 if (!connected(ps))
2724 mask |= EPOLLHUP;
2725 if (list_empty(&ps->list))
2726 mask |= EPOLLERR;
2727 return mask;
2728}
2729
2730const struct file_operations usbdev_file_operations = {
2731 .owner = THIS_MODULE,
2732 .llseek = no_seek_end_llseek,
2733 .read = usbdev_read,
2734 .poll = usbdev_poll,
2735 .unlocked_ioctl = usbdev_ioctl,
2736 .compat_ioctl = compat_ptr_ioctl,
2737 .mmap = usbdev_mmap,
2738 .open = usbdev_open,
2739 .release = usbdev_release,
2740};
2741
2742static void usbdev_remove(struct usb_device *udev)
2743{
2744 struct usb_dev_state *ps;
2745
2746 /* Protect against simultaneous resume */
2747 mutex_lock(&usbfs_mutex);
2748 while (!list_empty(&udev->filelist)) {
2749 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2750 destroy_all_async(ps);
2751 wake_up_all(&ps->wait);
2752 WRITE_ONCE(ps->not_yet_resumed, 0);
2753 wake_up_all(&ps->wait_for_resume);
2754 list_del_init(&ps->list);
2755 if (ps->discsignr)
2756 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2757 ps->disc_pid, ps->cred);
2758 }
2759 mutex_unlock(&usbfs_mutex);
2760}
2761
2762static int usbdev_notify(struct notifier_block *self,
2763 unsigned long action, void *dev)
2764{
2765 switch (action) {
2766 case USB_DEVICE_ADD:
2767 break;
2768 case USB_DEVICE_REMOVE:
2769 usbdev_remove(dev);
2770 break;
2771 }
2772 return NOTIFY_OK;
2773}
2774
2775static struct notifier_block usbdev_nb = {
2776 .notifier_call = usbdev_notify,
2777};
2778
2779static struct cdev usb_device_cdev;
2780
2781int __init usb_devio_init(void)
2782{
2783 int retval;
2784
2785 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2786 "usb_device");
2787 if (retval) {
2788 printk(KERN_ERR "Unable to register minors for usb_device\n");
2789 goto out;
2790 }
2791 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2792 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2793 if (retval) {
2794 printk(KERN_ERR "Unable to get usb_device major %d\n",
2795 USB_DEVICE_MAJOR);
2796 goto error_cdev;
2797 }
2798 usb_register_notify(&usbdev_nb);
2799out:
2800 return retval;
2801
2802error_cdev:
2803 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2804 goto out;
2805}
2806
2807void usb_devio_cleanup(void)
2808{
2809 usb_unregister_notify(&usbdev_nb);
2810 cdev_del(&usb_device_cdev);
2811 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2812}
1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22/*****************************************************************************/
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched/signal.h>
27#include <linux/slab.h>
28#include <linux/signal.h>
29#include <linux/poll.h>
30#include <linux/module.h>
31#include <linux/string.h>
32#include <linux/usb.h>
33#include <linux/usbdevice_fs.h>
34#include <linux/usb/hcd.h> /* for usbcore internals */
35#include <linux/cdev.h>
36#include <linux/notifier.h>
37#include <linux/security.h>
38#include <linux/user_namespace.h>
39#include <linux/scatterlist.h>
40#include <linux/uaccess.h>
41#include <linux/dma-mapping.h>
42#include <asm/byteorder.h>
43#include <linux/moduleparam.h>
44
45#include "usb.h"
46
47#define USB_MAXBUS 64
48#define USB_DEVICE_MAX (USB_MAXBUS * 128)
49#define USB_SG_SIZE 16384 /* split-size for large txs */
50
51/* Mutual exclusion for removal, open, and release */
52DEFINE_MUTEX(usbfs_mutex);
53
54struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
57 struct file *file;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
64 struct pid *disc_pid;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 disabled_bulk_eps;
69 bool privileges_dropped;
70 unsigned long interface_allowed_mask;
71};
72
73struct usb_memory {
74 struct list_head memlist;
75 int vma_use_count;
76 int urb_use_count;
77 u32 size;
78 void *mem;
79 dma_addr_t dma_handle;
80 unsigned long vm_start;
81 struct usb_dev_state *ps;
82};
83
84struct async {
85 struct list_head asynclist;
86 struct usb_dev_state *ps;
87 struct pid *pid;
88 const struct cred *cred;
89 unsigned int signr;
90 unsigned int ifnum;
91 void __user *userbuffer;
92 void __user *userurb;
93 struct urb *urb;
94 struct usb_memory *usbm;
95 unsigned int mem_usage;
96 int status;
97 u8 bulk_addr;
98 u8 bulk_status;
99};
100
101static bool usbfs_snoop;
102module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
103MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
104
105static unsigned usbfs_snoop_max = 65536;
106module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
107MODULE_PARM_DESC(usbfs_snoop_max,
108 "maximum number of bytes to print while snooping");
109
110#define snoop(dev, format, arg...) \
111 do { \
112 if (usbfs_snoop) \
113 dev_info(dev, format, ## arg); \
114 } while (0)
115
116enum snoop_when {
117 SUBMIT, COMPLETE
118};
119
120#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
121
122/* Limit on the total amount of memory we can allocate for transfers */
123static u32 usbfs_memory_mb = 16;
124module_param(usbfs_memory_mb, uint, 0644);
125MODULE_PARM_DESC(usbfs_memory_mb,
126 "maximum MB allowed for usbfs buffers (0 = no limit)");
127
128/* Hard limit, necessary to avoid arithmetic overflow */
129#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
130
131static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
132
133/* Check whether it's okay to allocate more memory for a transfer */
134static int usbfs_increase_memory_usage(u64 amount)
135{
136 u64 lim;
137
138 lim = READ_ONCE(usbfs_memory_mb);
139 lim <<= 20;
140
141 atomic64_add(amount, &usbfs_memory_usage);
142
143 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
144 atomic64_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 return 0;
149}
150
151/* Memory for a transfer is being deallocated */
152static void usbfs_decrease_memory_usage(u64 amount)
153{
154 atomic64_sub(amount, &usbfs_memory_usage);
155}
156
157static int connected(struct usb_dev_state *ps)
158{
159 return (!list_empty(&ps->list) &&
160 ps->dev->state != USB_STATE_NOTATTACHED);
161}
162
163static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
164{
165 struct usb_dev_state *ps = usbm->ps;
166 unsigned long flags;
167
168 spin_lock_irqsave(&ps->lock, flags);
169 --*count;
170 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
171 list_del(&usbm->memlist);
172 spin_unlock_irqrestore(&ps->lock, flags);
173
174 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
175 usbm->dma_handle);
176 usbfs_decrease_memory_usage(
177 usbm->size + sizeof(struct usb_memory));
178 kfree(usbm);
179 } else {
180 spin_unlock_irqrestore(&ps->lock, flags);
181 }
182}
183
184static void usbdev_vm_open(struct vm_area_struct *vma)
185{
186 struct usb_memory *usbm = vma->vm_private_data;
187 unsigned long flags;
188
189 spin_lock_irqsave(&usbm->ps->lock, flags);
190 ++usbm->vma_use_count;
191 spin_unlock_irqrestore(&usbm->ps->lock, flags);
192}
193
194static void usbdev_vm_close(struct vm_area_struct *vma)
195{
196 struct usb_memory *usbm = vma->vm_private_data;
197
198 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
199}
200
201static const struct vm_operations_struct usbdev_vm_ops = {
202 .open = usbdev_vm_open,
203 .close = usbdev_vm_close
204};
205
206static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
207{
208 struct usb_memory *usbm = NULL;
209 struct usb_dev_state *ps = file->private_data;
210 size_t size = vma->vm_end - vma->vm_start;
211 void *mem;
212 unsigned long flags;
213 dma_addr_t dma_handle;
214 int ret;
215
216 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
217 if (ret)
218 goto error;
219
220 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
221 if (!usbm) {
222 ret = -ENOMEM;
223 goto error_decrease_mem;
224 }
225
226 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
227 &dma_handle);
228 if (!mem) {
229 ret = -ENOMEM;
230 goto error_free_usbm;
231 }
232
233 memset(mem, 0, size);
234
235 usbm->mem = mem;
236 usbm->dma_handle = dma_handle;
237 usbm->size = size;
238 usbm->ps = ps;
239 usbm->vm_start = vma->vm_start;
240 usbm->vma_use_count = 1;
241 INIT_LIST_HEAD(&usbm->memlist);
242
243 if (remap_pfn_range(vma, vma->vm_start,
244 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
245 size, vma->vm_page_prot) < 0) {
246 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
247 return -EAGAIN;
248 }
249
250 vma->vm_flags |= VM_IO;
251 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
252 vma->vm_ops = &usbdev_vm_ops;
253 vma->vm_private_data = usbm;
254
255 spin_lock_irqsave(&ps->lock, flags);
256 list_add_tail(&usbm->memlist, &ps->memory_list);
257 spin_unlock_irqrestore(&ps->lock, flags);
258
259 return 0;
260
261error_free_usbm:
262 kfree(usbm);
263error_decrease_mem:
264 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
265error:
266 return ret;
267}
268
269static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
270 loff_t *ppos)
271{
272 struct usb_dev_state *ps = file->private_data;
273 struct usb_device *dev = ps->dev;
274 ssize_t ret = 0;
275 unsigned len;
276 loff_t pos;
277 int i;
278
279 pos = *ppos;
280 usb_lock_device(dev);
281 if (!connected(ps)) {
282 ret = -ENODEV;
283 goto err;
284 } else if (pos < 0) {
285 ret = -EINVAL;
286 goto err;
287 }
288
289 if (pos < sizeof(struct usb_device_descriptor)) {
290 /* 18 bytes - fits on the stack */
291 struct usb_device_descriptor temp_desc;
292
293 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
294 le16_to_cpus(&temp_desc.bcdUSB);
295 le16_to_cpus(&temp_desc.idVendor);
296 le16_to_cpus(&temp_desc.idProduct);
297 le16_to_cpus(&temp_desc.bcdDevice);
298
299 len = sizeof(struct usb_device_descriptor) - pos;
300 if (len > nbytes)
301 len = nbytes;
302 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
303 ret = -EFAULT;
304 goto err;
305 }
306
307 *ppos += len;
308 buf += len;
309 nbytes -= len;
310 ret += len;
311 }
312
313 pos = sizeof(struct usb_device_descriptor);
314 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
315 struct usb_config_descriptor *config =
316 (struct usb_config_descriptor *)dev->rawdescriptors[i];
317 unsigned int length = le16_to_cpu(config->wTotalLength);
318
319 if (*ppos < pos + length) {
320
321 /* The descriptor may claim to be longer than it
322 * really is. Here is the actual allocated length. */
323 unsigned alloclen =
324 le16_to_cpu(dev->config[i].desc.wTotalLength);
325
326 len = length - (*ppos - pos);
327 if (len > nbytes)
328 len = nbytes;
329
330 /* Simply don't write (skip over) unallocated parts */
331 if (alloclen > (*ppos - pos)) {
332 alloclen -= (*ppos - pos);
333 if (copy_to_user(buf,
334 dev->rawdescriptors[i] + (*ppos - pos),
335 min(len, alloclen))) {
336 ret = -EFAULT;
337 goto err;
338 }
339 }
340
341 *ppos += len;
342 buf += len;
343 nbytes -= len;
344 ret += len;
345 }
346
347 pos += length;
348 }
349
350err:
351 usb_unlock_device(dev);
352 return ret;
353}
354
355/*
356 * async list handling
357 */
358
359static struct async *alloc_async(unsigned int numisoframes)
360{
361 struct async *as;
362
363 as = kzalloc(sizeof(struct async), GFP_KERNEL);
364 if (!as)
365 return NULL;
366 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
367 if (!as->urb) {
368 kfree(as);
369 return NULL;
370 }
371 return as;
372}
373
374static void free_async(struct async *as)
375{
376 int i;
377
378 put_pid(as->pid);
379 if (as->cred)
380 put_cred(as->cred);
381 for (i = 0; i < as->urb->num_sgs; i++) {
382 if (sg_page(&as->urb->sg[i]))
383 kfree(sg_virt(&as->urb->sg[i]));
384 }
385
386 kfree(as->urb->sg);
387 if (as->usbm == NULL)
388 kfree(as->urb->transfer_buffer);
389 else
390 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
391
392 kfree(as->urb->setup_packet);
393 usb_free_urb(as->urb);
394 usbfs_decrease_memory_usage(as->mem_usage);
395 kfree(as);
396}
397
398static void async_newpending(struct async *as)
399{
400 struct usb_dev_state *ps = as->ps;
401 unsigned long flags;
402
403 spin_lock_irqsave(&ps->lock, flags);
404 list_add_tail(&as->asynclist, &ps->async_pending);
405 spin_unlock_irqrestore(&ps->lock, flags);
406}
407
408static void async_removepending(struct async *as)
409{
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_del_init(&as->asynclist);
415 spin_unlock_irqrestore(&ps->lock, flags);
416}
417
418static struct async *async_getcompleted(struct usb_dev_state *ps)
419{
420 unsigned long flags;
421 struct async *as = NULL;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 if (!list_empty(&ps->async_completed)) {
425 as = list_entry(ps->async_completed.next, struct async,
426 asynclist);
427 list_del_init(&as->asynclist);
428 }
429 spin_unlock_irqrestore(&ps->lock, flags);
430 return as;
431}
432
433static struct async *async_getpending(struct usb_dev_state *ps,
434 void __user *userurb)
435{
436 struct async *as;
437
438 list_for_each_entry(as, &ps->async_pending, asynclist)
439 if (as->userurb == userurb) {
440 list_del_init(&as->asynclist);
441 return as;
442 }
443
444 return NULL;
445}
446
447static void snoop_urb(struct usb_device *udev,
448 void __user *userurb, int pipe, unsigned length,
449 int timeout_or_status, enum snoop_when when,
450 unsigned char *data, unsigned data_len)
451{
452 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
453 static const char *dirs[] = {"out", "in"};
454 int ep;
455 const char *t, *d;
456
457 if (!usbfs_snoop)
458 return;
459
460 ep = usb_pipeendpoint(pipe);
461 t = types[usb_pipetype(pipe)];
462 d = dirs[!!usb_pipein(pipe)];
463
464 if (userurb) { /* Async */
465 if (when == SUBMIT)
466 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
467 "length %u\n",
468 userurb, ep, t, d, length);
469 else
470 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
471 "actual_length %u status %d\n",
472 userurb, ep, t, d, length,
473 timeout_or_status);
474 } else {
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
477 "timeout %d\n",
478 ep, t, d, length, timeout_or_status);
479 else
480 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
481 "status %d\n",
482 ep, t, d, length, timeout_or_status);
483 }
484
485 data_len = min(data_len, usbfs_snoop_max);
486 if (data && data_len > 0) {
487 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
488 data, data_len, 1);
489 }
490}
491
492static void snoop_urb_data(struct urb *urb, unsigned len)
493{
494 int i, size;
495
496 len = min(len, usbfs_snoop_max);
497 if (!usbfs_snoop || len == 0)
498 return;
499
500 if (urb->num_sgs == 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
502 urb->transfer_buffer, len, 1);
503 return;
504 }
505
506 for (i = 0; i < urb->num_sgs && len; i++) {
507 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
508 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
509 sg_virt(&urb->sg[i]), size, 1);
510 len -= size;
511 }
512}
513
514static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
515{
516 unsigned i, len, size;
517
518 if (urb->number_of_packets > 0) /* Isochronous */
519 len = urb->transfer_buffer_length;
520 else /* Non-Isoc */
521 len = urb->actual_length;
522
523 if (urb->num_sgs == 0) {
524 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
525 return -EFAULT;
526 return 0;
527 }
528
529 for (i = 0; i < urb->num_sgs && len; i++) {
530 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
531 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
532 return -EFAULT;
533 userbuffer += size;
534 len -= size;
535 }
536
537 return 0;
538}
539
540#define AS_CONTINUATION 1
541#define AS_UNLINK 2
542
543static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
544__releases(ps->lock)
545__acquires(ps->lock)
546{
547 struct urb *urb;
548 struct async *as;
549
550 /* Mark all the pending URBs that match bulk_addr, up to but not
551 * including the first one without AS_CONTINUATION. If such an
552 * URB is encountered then a new transfer has already started so
553 * the endpoint doesn't need to be disabled; otherwise it does.
554 */
555 list_for_each_entry(as, &ps->async_pending, asynclist) {
556 if (as->bulk_addr == bulk_addr) {
557 if (as->bulk_status != AS_CONTINUATION)
558 goto rescan;
559 as->bulk_status = AS_UNLINK;
560 as->bulk_addr = 0;
561 }
562 }
563 ps->disabled_bulk_eps |= (1 << bulk_addr);
564
565 /* Now carefully unlink all the marked pending URBs */
566 rescan:
567 list_for_each_entry(as, &ps->async_pending, asynclist) {
568 if (as->bulk_status == AS_UNLINK) {
569 as->bulk_status = 0; /* Only once */
570 urb = as->urb;
571 usb_get_urb(urb);
572 spin_unlock(&ps->lock); /* Allow completions */
573 usb_unlink_urb(urb);
574 usb_put_urb(urb);
575 spin_lock(&ps->lock);
576 goto rescan;
577 }
578 }
579}
580
581static void async_completed(struct urb *urb)
582{
583 struct async *as = urb->context;
584 struct usb_dev_state *ps = as->ps;
585 struct siginfo sinfo;
586 struct pid *pid = NULL;
587 const struct cred *cred = NULL;
588 int signr;
589
590 spin_lock(&ps->lock);
591 list_move_tail(&as->asynclist, &ps->async_completed);
592 as->status = urb->status;
593 signr = as->signr;
594 if (signr) {
595 clear_siginfo(&sinfo);
596 sinfo.si_signo = as->signr;
597 sinfo.si_errno = as->status;
598 sinfo.si_code = SI_ASYNCIO;
599 sinfo.si_addr = as->userurb;
600 pid = get_pid(as->pid);
601 cred = get_cred(as->cred);
602 }
603 snoop(&urb->dev->dev, "urb complete\n");
604 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
605 as->status, COMPLETE, NULL, 0);
606 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
607 snoop_urb_data(urb, urb->actual_length);
608
609 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
610 as->status != -ENOENT)
611 cancel_bulk_urbs(ps, as->bulk_addr);
612
613 wake_up(&ps->wait);
614 spin_unlock(&ps->lock);
615
616 if (signr) {
617 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
618 put_pid(pid);
619 put_cred(cred);
620 }
621}
622
623static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
624{
625 struct urb *urb;
626 struct async *as;
627 unsigned long flags;
628
629 spin_lock_irqsave(&ps->lock, flags);
630 while (!list_empty(list)) {
631 as = list_entry(list->next, struct async, asynclist);
632 list_del_init(&as->asynclist);
633 urb = as->urb;
634 usb_get_urb(urb);
635
636 /* drop the spinlock so the completion handler can run */
637 spin_unlock_irqrestore(&ps->lock, flags);
638 usb_kill_urb(urb);
639 usb_put_urb(urb);
640 spin_lock_irqsave(&ps->lock, flags);
641 }
642 spin_unlock_irqrestore(&ps->lock, flags);
643}
644
645static void destroy_async_on_interface(struct usb_dev_state *ps,
646 unsigned int ifnum)
647{
648 struct list_head *p, *q, hitlist;
649 unsigned long flags;
650
651 INIT_LIST_HEAD(&hitlist);
652 spin_lock_irqsave(&ps->lock, flags);
653 list_for_each_safe(p, q, &ps->async_pending)
654 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
655 list_move_tail(p, &hitlist);
656 spin_unlock_irqrestore(&ps->lock, flags);
657 destroy_async(ps, &hitlist);
658}
659
660static void destroy_all_async(struct usb_dev_state *ps)
661{
662 destroy_async(ps, &ps->async_pending);
663}
664
665/*
666 * interface claims are made only at the request of user level code,
667 * which can also release them (explicitly or by closing files).
668 * they're also undone when devices disconnect.
669 */
670
671static int driver_probe(struct usb_interface *intf,
672 const struct usb_device_id *id)
673{
674 return -ENODEV;
675}
676
677static void driver_disconnect(struct usb_interface *intf)
678{
679 struct usb_dev_state *ps = usb_get_intfdata(intf);
680 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
681
682 if (!ps)
683 return;
684
685 /* NOTE: this relies on usbcore having canceled and completed
686 * all pending I/O requests; 2.6 does that.
687 */
688
689 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
690 clear_bit(ifnum, &ps->ifclaimed);
691 else
692 dev_warn(&intf->dev, "interface number %u out of range\n",
693 ifnum);
694
695 usb_set_intfdata(intf, NULL);
696
697 /* force async requests to complete */
698 destroy_async_on_interface(ps, ifnum);
699}
700
701/* The following routines are merely placeholders. There is no way
702 * to inform a user task about suspend or resumes.
703 */
704static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
705{
706 return 0;
707}
708
709static int driver_resume(struct usb_interface *intf)
710{
711 return 0;
712}
713
714struct usb_driver usbfs_driver = {
715 .name = "usbfs",
716 .probe = driver_probe,
717 .disconnect = driver_disconnect,
718 .suspend = driver_suspend,
719 .resume = driver_resume,
720};
721
722static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
723{
724 struct usb_device *dev = ps->dev;
725 struct usb_interface *intf;
726 int err;
727
728 if (ifnum >= 8*sizeof(ps->ifclaimed))
729 return -EINVAL;
730 /* already claimed */
731 if (test_bit(ifnum, &ps->ifclaimed))
732 return 0;
733
734 if (ps->privileges_dropped &&
735 !test_bit(ifnum, &ps->interface_allowed_mask))
736 return -EACCES;
737
738 intf = usb_ifnum_to_if(dev, ifnum);
739 if (!intf)
740 err = -ENOENT;
741 else
742 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
743 if (err == 0)
744 set_bit(ifnum, &ps->ifclaimed);
745 return err;
746}
747
748static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
749{
750 struct usb_device *dev;
751 struct usb_interface *intf;
752 int err;
753
754 err = -EINVAL;
755 if (ifnum >= 8*sizeof(ps->ifclaimed))
756 return err;
757 dev = ps->dev;
758 intf = usb_ifnum_to_if(dev, ifnum);
759 if (!intf)
760 err = -ENOENT;
761 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
762 usb_driver_release_interface(&usbfs_driver, intf);
763 err = 0;
764 }
765 return err;
766}
767
768static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
769{
770 if (ps->dev->state != USB_STATE_CONFIGURED)
771 return -EHOSTUNREACH;
772 if (ifnum >= 8*sizeof(ps->ifclaimed))
773 return -EINVAL;
774 if (test_bit(ifnum, &ps->ifclaimed))
775 return 0;
776 /* if not yet claimed, claim it for the driver */
777 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
778 "interface %u before use\n", task_pid_nr(current),
779 current->comm, ifnum);
780 return claimintf(ps, ifnum);
781}
782
783static int findintfep(struct usb_device *dev, unsigned int ep)
784{
785 unsigned int i, j, e;
786 struct usb_interface *intf;
787 struct usb_host_interface *alts;
788 struct usb_endpoint_descriptor *endpt;
789
790 if (ep & ~(USB_DIR_IN|0xf))
791 return -EINVAL;
792 if (!dev->actconfig)
793 return -ESRCH;
794 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
795 intf = dev->actconfig->interface[i];
796 for (j = 0; j < intf->num_altsetting; j++) {
797 alts = &intf->altsetting[j];
798 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
799 endpt = &alts->endpoint[e].desc;
800 if (endpt->bEndpointAddress == ep)
801 return alts->desc.bInterfaceNumber;
802 }
803 }
804 }
805 return -ENOENT;
806}
807
808static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
809 unsigned int request, unsigned int index)
810{
811 int ret = 0;
812 struct usb_host_interface *alt_setting;
813
814 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
815 && ps->dev->state != USB_STATE_ADDRESS
816 && ps->dev->state != USB_STATE_CONFIGURED)
817 return -EHOSTUNREACH;
818 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
819 return 0;
820
821 /*
822 * check for the special corner case 'get_device_id' in the printer
823 * class specification, which we always want to allow as it is used
824 * to query things like ink level, etc.
825 */
826 if (requesttype == 0xa1 && request == 0) {
827 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
828 index >> 8, index & 0xff);
829 if (alt_setting
830 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
831 return 0;
832 }
833
834 index &= 0xff;
835 switch (requesttype & USB_RECIP_MASK) {
836 case USB_RECIP_ENDPOINT:
837 if ((index & ~USB_DIR_IN) == 0)
838 return 0;
839 ret = findintfep(ps->dev, index);
840 if (ret < 0) {
841 /*
842 * Some not fully compliant Win apps seem to get
843 * index wrong and have the endpoint number here
844 * rather than the endpoint address (with the
845 * correct direction). Win does let this through,
846 * so we'll not reject it here but leave it to
847 * the device to not break KVM. But we warn.
848 */
849 ret = findintfep(ps->dev, index ^ 0x80);
850 if (ret >= 0)
851 dev_info(&ps->dev->dev,
852 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
853 __func__, task_pid_nr(current),
854 current->comm, index, index ^ 0x80);
855 }
856 if (ret >= 0)
857 ret = checkintf(ps, ret);
858 break;
859
860 case USB_RECIP_INTERFACE:
861 ret = checkintf(ps, index);
862 break;
863 }
864 return ret;
865}
866
867static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
868 unsigned char ep)
869{
870 if (ep & USB_ENDPOINT_DIR_MASK)
871 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
872 else
873 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
874}
875
876static int parse_usbdevfs_streams(struct usb_dev_state *ps,
877 struct usbdevfs_streams __user *streams,
878 unsigned int *num_streams_ret,
879 unsigned int *num_eps_ret,
880 struct usb_host_endpoint ***eps_ret,
881 struct usb_interface **intf_ret)
882{
883 unsigned int i, num_streams, num_eps;
884 struct usb_host_endpoint **eps;
885 struct usb_interface *intf = NULL;
886 unsigned char ep;
887 int ifnum, ret;
888
889 if (get_user(num_streams, &streams->num_streams) ||
890 get_user(num_eps, &streams->num_eps))
891 return -EFAULT;
892
893 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
894 return -EINVAL;
895
896 /* The XHCI controller allows max 2 ^ 16 streams */
897 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
898 return -EINVAL;
899
900 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
901 if (!eps)
902 return -ENOMEM;
903
904 for (i = 0; i < num_eps; i++) {
905 if (get_user(ep, &streams->eps[i])) {
906 ret = -EFAULT;
907 goto error;
908 }
909 eps[i] = ep_to_host_endpoint(ps->dev, ep);
910 if (!eps[i]) {
911 ret = -EINVAL;
912 goto error;
913 }
914
915 /* usb_alloc/free_streams operate on an usb_interface */
916 ifnum = findintfep(ps->dev, ep);
917 if (ifnum < 0) {
918 ret = ifnum;
919 goto error;
920 }
921
922 if (i == 0) {
923 ret = checkintf(ps, ifnum);
924 if (ret < 0)
925 goto error;
926 intf = usb_ifnum_to_if(ps->dev, ifnum);
927 } else {
928 /* Verify all eps belong to the same interface */
929 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
930 ret = -EINVAL;
931 goto error;
932 }
933 }
934 }
935
936 if (num_streams_ret)
937 *num_streams_ret = num_streams;
938 *num_eps_ret = num_eps;
939 *eps_ret = eps;
940 *intf_ret = intf;
941
942 return 0;
943
944error:
945 kfree(eps);
946 return ret;
947}
948
949static int match_devt(struct device *dev, void *data)
950{
951 return dev->devt == (dev_t) (unsigned long) data;
952}
953
954static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
955{
956 struct device *dev;
957
958 dev = bus_find_device(&usb_bus_type, NULL,
959 (void *) (unsigned long) devt, match_devt);
960 if (!dev)
961 return NULL;
962 return to_usb_device(dev);
963}
964
965/*
966 * file operations
967 */
968static int usbdev_open(struct inode *inode, struct file *file)
969{
970 struct usb_device *dev = NULL;
971 struct usb_dev_state *ps;
972 int ret;
973
974 ret = -ENOMEM;
975 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
976 if (!ps)
977 goto out_free_ps;
978
979 ret = -ENODEV;
980
981 /* Protect against simultaneous removal or release */
982 mutex_lock(&usbfs_mutex);
983
984 /* usbdev device-node */
985 if (imajor(inode) == USB_DEVICE_MAJOR)
986 dev = usbdev_lookup_by_devt(inode->i_rdev);
987
988 mutex_unlock(&usbfs_mutex);
989
990 if (!dev)
991 goto out_free_ps;
992
993 usb_lock_device(dev);
994 if (dev->state == USB_STATE_NOTATTACHED)
995 goto out_unlock_device;
996
997 ret = usb_autoresume_device(dev);
998 if (ret)
999 goto out_unlock_device;
1000
1001 ps->dev = dev;
1002 ps->file = file;
1003 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1004 spin_lock_init(&ps->lock);
1005 INIT_LIST_HEAD(&ps->list);
1006 INIT_LIST_HEAD(&ps->async_pending);
1007 INIT_LIST_HEAD(&ps->async_completed);
1008 INIT_LIST_HEAD(&ps->memory_list);
1009 init_waitqueue_head(&ps->wait);
1010 ps->disc_pid = get_pid(task_pid(current));
1011 ps->cred = get_current_cred();
1012 smp_wmb();
1013 list_add_tail(&ps->list, &dev->filelist);
1014 file->private_data = ps;
1015 usb_unlock_device(dev);
1016 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1017 current->comm);
1018 return ret;
1019
1020 out_unlock_device:
1021 usb_unlock_device(dev);
1022 usb_put_dev(dev);
1023 out_free_ps:
1024 kfree(ps);
1025 return ret;
1026}
1027
1028static int usbdev_release(struct inode *inode, struct file *file)
1029{
1030 struct usb_dev_state *ps = file->private_data;
1031 struct usb_device *dev = ps->dev;
1032 unsigned int ifnum;
1033 struct async *as;
1034
1035 usb_lock_device(dev);
1036 usb_hub_release_all_ports(dev, ps);
1037
1038 list_del_init(&ps->list);
1039
1040 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1041 ifnum++) {
1042 if (test_bit(ifnum, &ps->ifclaimed))
1043 releaseintf(ps, ifnum);
1044 }
1045 destroy_all_async(ps);
1046 usb_autosuspend_device(dev);
1047 usb_unlock_device(dev);
1048 usb_put_dev(dev);
1049 put_pid(ps->disc_pid);
1050 put_cred(ps->cred);
1051
1052 as = async_getcompleted(ps);
1053 while (as) {
1054 free_async(as);
1055 as = async_getcompleted(ps);
1056 }
1057
1058 kfree(ps);
1059 return 0;
1060}
1061
1062static int proc_control(struct usb_dev_state *ps, void __user *arg)
1063{
1064 struct usb_device *dev = ps->dev;
1065 struct usbdevfs_ctrltransfer ctrl;
1066 unsigned int tmo;
1067 unsigned char *tbuf;
1068 unsigned wLength;
1069 int i, pipe, ret;
1070
1071 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1072 return -EFAULT;
1073 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1074 ctrl.wIndex);
1075 if (ret)
1076 return ret;
1077 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1078 if (wLength > PAGE_SIZE)
1079 return -EINVAL;
1080 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1081 sizeof(struct usb_ctrlrequest));
1082 if (ret)
1083 return ret;
1084 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1085 if (!tbuf) {
1086 ret = -ENOMEM;
1087 goto done;
1088 }
1089 tmo = ctrl.timeout;
1090 snoop(&dev->dev, "control urb: bRequestType=%02x "
1091 "bRequest=%02x wValue=%04x "
1092 "wIndex=%04x wLength=%04x\n",
1093 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1094 ctrl.wIndex, ctrl.wLength);
1095 if (ctrl.bRequestType & 0x80) {
1096 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1097 ctrl.wLength)) {
1098 ret = -EINVAL;
1099 goto done;
1100 }
1101 pipe = usb_rcvctrlpipe(dev, 0);
1102 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1103
1104 usb_unlock_device(dev);
1105 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1106 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1107 tbuf, ctrl.wLength, tmo);
1108 usb_lock_device(dev);
1109 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1110 tbuf, max(i, 0));
1111 if ((i > 0) && ctrl.wLength) {
1112 if (copy_to_user(ctrl.data, tbuf, i)) {
1113 ret = -EFAULT;
1114 goto done;
1115 }
1116 }
1117 } else {
1118 if (ctrl.wLength) {
1119 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1120 ret = -EFAULT;
1121 goto done;
1122 }
1123 }
1124 pipe = usb_sndctrlpipe(dev, 0);
1125 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1126 tbuf, ctrl.wLength);
1127
1128 usb_unlock_device(dev);
1129 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1130 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1131 tbuf, ctrl.wLength, tmo);
1132 usb_lock_device(dev);
1133 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1134 }
1135 if (i < 0 && i != -EPIPE) {
1136 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1137 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1138 current->comm, ctrl.bRequestType, ctrl.bRequest,
1139 ctrl.wLength, i);
1140 }
1141 ret = i;
1142 done:
1143 free_page((unsigned long) tbuf);
1144 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1145 sizeof(struct usb_ctrlrequest));
1146 return ret;
1147}
1148
1149static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1150{
1151 struct usb_device *dev = ps->dev;
1152 struct usbdevfs_bulktransfer bulk;
1153 unsigned int tmo, len1, pipe;
1154 int len2;
1155 unsigned char *tbuf;
1156 int i, ret;
1157
1158 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1159 return -EFAULT;
1160 ret = findintfep(ps->dev, bulk.ep);
1161 if (ret < 0)
1162 return ret;
1163 ret = checkintf(ps, ret);
1164 if (ret)
1165 return ret;
1166 if (bulk.ep & USB_DIR_IN)
1167 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1168 else
1169 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1170 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1171 return -EINVAL;
1172 len1 = bulk.len;
1173 if (len1 >= (INT_MAX - sizeof(struct urb)))
1174 return -EINVAL;
1175 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1176 if (ret)
1177 return ret;
1178 tbuf = kmalloc(len1, GFP_KERNEL);
1179 if (!tbuf) {
1180 ret = -ENOMEM;
1181 goto done;
1182 }
1183 tmo = bulk.timeout;
1184 if (bulk.ep & 0x80) {
1185 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1186 ret = -EINVAL;
1187 goto done;
1188 }
1189 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1190
1191 usb_unlock_device(dev);
1192 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1193 usb_lock_device(dev);
1194 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1195
1196 if (!i && len2) {
1197 if (copy_to_user(bulk.data, tbuf, len2)) {
1198 ret = -EFAULT;
1199 goto done;
1200 }
1201 }
1202 } else {
1203 if (len1) {
1204 if (copy_from_user(tbuf, bulk.data, len1)) {
1205 ret = -EFAULT;
1206 goto done;
1207 }
1208 }
1209 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1210
1211 usb_unlock_device(dev);
1212 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1213 usb_lock_device(dev);
1214 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1215 }
1216 ret = (i < 0 ? i : len2);
1217 done:
1218 kfree(tbuf);
1219 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1220 return ret;
1221}
1222
1223static void check_reset_of_active_ep(struct usb_device *udev,
1224 unsigned int epnum, char *ioctl_name)
1225{
1226 struct usb_host_endpoint **eps;
1227 struct usb_host_endpoint *ep;
1228
1229 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1230 ep = eps[epnum & 0x0f];
1231 if (ep && !list_empty(&ep->urb_list))
1232 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1233 task_pid_nr(current), current->comm,
1234 ioctl_name, epnum);
1235}
1236
1237static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1238{
1239 unsigned int ep;
1240 int ret;
1241
1242 if (get_user(ep, (unsigned int __user *)arg))
1243 return -EFAULT;
1244 ret = findintfep(ps->dev, ep);
1245 if (ret < 0)
1246 return ret;
1247 ret = checkintf(ps, ret);
1248 if (ret)
1249 return ret;
1250 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1251 usb_reset_endpoint(ps->dev, ep);
1252 return 0;
1253}
1254
1255static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1256{
1257 unsigned int ep;
1258 int pipe;
1259 int ret;
1260
1261 if (get_user(ep, (unsigned int __user *)arg))
1262 return -EFAULT;
1263 ret = findintfep(ps->dev, ep);
1264 if (ret < 0)
1265 return ret;
1266 ret = checkintf(ps, ret);
1267 if (ret)
1268 return ret;
1269 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1270 if (ep & USB_DIR_IN)
1271 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1272 else
1273 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1274
1275 return usb_clear_halt(ps->dev, pipe);
1276}
1277
1278static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1279{
1280 struct usbdevfs_getdriver gd;
1281 struct usb_interface *intf;
1282 int ret;
1283
1284 if (copy_from_user(&gd, arg, sizeof(gd)))
1285 return -EFAULT;
1286 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1287 if (!intf || !intf->dev.driver)
1288 ret = -ENODATA;
1289 else {
1290 strlcpy(gd.driver, intf->dev.driver->name,
1291 sizeof(gd.driver));
1292 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1293 }
1294 return ret;
1295}
1296
1297static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1298{
1299 struct usbdevfs_connectinfo ci;
1300
1301 memset(&ci, 0, sizeof(ci));
1302 ci.devnum = ps->dev->devnum;
1303 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1304
1305 if (copy_to_user(arg, &ci, sizeof(ci)))
1306 return -EFAULT;
1307 return 0;
1308}
1309
1310static int proc_resetdevice(struct usb_dev_state *ps)
1311{
1312 struct usb_host_config *actconfig = ps->dev->actconfig;
1313 struct usb_interface *interface;
1314 int i, number;
1315
1316 /* Don't allow a device reset if the process has dropped the
1317 * privilege to do such things and any of the interfaces are
1318 * currently claimed.
1319 */
1320 if (ps->privileges_dropped && actconfig) {
1321 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1322 interface = actconfig->interface[i];
1323 number = interface->cur_altsetting->desc.bInterfaceNumber;
1324 if (usb_interface_claimed(interface) &&
1325 !test_bit(number, &ps->ifclaimed)) {
1326 dev_warn(&ps->dev->dev,
1327 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1328 number, interface->dev.driver->name, current->comm);
1329 return -EACCES;
1330 }
1331 }
1332 }
1333
1334 return usb_reset_device(ps->dev);
1335}
1336
1337static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1338{
1339 struct usbdevfs_setinterface setintf;
1340 int ret;
1341
1342 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1343 return -EFAULT;
1344 ret = checkintf(ps, setintf.interface);
1345 if (ret)
1346 return ret;
1347
1348 destroy_async_on_interface(ps, setintf.interface);
1349
1350 return usb_set_interface(ps->dev, setintf.interface,
1351 setintf.altsetting);
1352}
1353
1354static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1355{
1356 int u;
1357 int status = 0;
1358 struct usb_host_config *actconfig;
1359
1360 if (get_user(u, (int __user *)arg))
1361 return -EFAULT;
1362
1363 actconfig = ps->dev->actconfig;
1364
1365 /* Don't touch the device if any interfaces are claimed.
1366 * It could interfere with other drivers' operations, and if
1367 * an interface is claimed by usbfs it could easily deadlock.
1368 */
1369 if (actconfig) {
1370 int i;
1371
1372 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1373 if (usb_interface_claimed(actconfig->interface[i])) {
1374 dev_warn(&ps->dev->dev,
1375 "usbfs: interface %d claimed by %s "
1376 "while '%s' sets config #%d\n",
1377 actconfig->interface[i]
1378 ->cur_altsetting
1379 ->desc.bInterfaceNumber,
1380 actconfig->interface[i]
1381 ->dev.driver->name,
1382 current->comm, u);
1383 status = -EBUSY;
1384 break;
1385 }
1386 }
1387 }
1388
1389 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1390 * so avoid usb_set_configuration()'s kick to sysfs
1391 */
1392 if (status == 0) {
1393 if (actconfig && actconfig->desc.bConfigurationValue == u)
1394 status = usb_reset_configuration(ps->dev);
1395 else
1396 status = usb_set_configuration(ps->dev, u);
1397 }
1398
1399 return status;
1400}
1401
1402static struct usb_memory *
1403find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1404{
1405 struct usb_memory *usbm = NULL, *iter;
1406 unsigned long flags;
1407 unsigned long uurb_start = (unsigned long)uurb->buffer;
1408
1409 spin_lock_irqsave(&ps->lock, flags);
1410 list_for_each_entry(iter, &ps->memory_list, memlist) {
1411 if (uurb_start >= iter->vm_start &&
1412 uurb_start < iter->vm_start + iter->size) {
1413 if (uurb->buffer_length > iter->vm_start + iter->size -
1414 uurb_start) {
1415 usbm = ERR_PTR(-EINVAL);
1416 } else {
1417 usbm = iter;
1418 usbm->urb_use_count++;
1419 }
1420 break;
1421 }
1422 }
1423 spin_unlock_irqrestore(&ps->lock, flags);
1424 return usbm;
1425}
1426
1427static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1428 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1429 void __user *arg)
1430{
1431 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1432 struct usb_host_endpoint *ep;
1433 struct async *as = NULL;
1434 struct usb_ctrlrequest *dr = NULL;
1435 unsigned int u, totlen, isofrmlen;
1436 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1437 int number_of_packets = 0;
1438 unsigned int stream_id = 0;
1439 void *buf;
1440 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1441 USBDEVFS_URB_BULK_CONTINUATION |
1442 USBDEVFS_URB_NO_FSBR |
1443 USBDEVFS_URB_ZERO_PACKET |
1444 USBDEVFS_URB_NO_INTERRUPT;
1445 /* USBDEVFS_URB_ISO_ASAP is a special case */
1446 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1447 mask |= USBDEVFS_URB_ISO_ASAP;
1448
1449 if (uurb->flags & ~mask)
1450 return -EINVAL;
1451
1452 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1453 return -EINVAL;
1454 if (uurb->buffer_length > 0 && !uurb->buffer)
1455 return -EINVAL;
1456 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1457 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1458 ifnum = findintfep(ps->dev, uurb->endpoint);
1459 if (ifnum < 0)
1460 return ifnum;
1461 ret = checkintf(ps, ifnum);
1462 if (ret)
1463 return ret;
1464 }
1465 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1466 if (!ep)
1467 return -ENOENT;
1468 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1469
1470 u = 0;
1471 switch (uurb->type) {
1472 case USBDEVFS_URB_TYPE_CONTROL:
1473 if (!usb_endpoint_xfer_control(&ep->desc))
1474 return -EINVAL;
1475 /* min 8 byte setup packet */
1476 if (uurb->buffer_length < 8)
1477 return -EINVAL;
1478 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1479 if (!dr)
1480 return -ENOMEM;
1481 if (copy_from_user(dr, uurb->buffer, 8)) {
1482 ret = -EFAULT;
1483 goto error;
1484 }
1485 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1486 ret = -EINVAL;
1487 goto error;
1488 }
1489 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1490 le16_to_cpup(&dr->wIndex));
1491 if (ret)
1492 goto error;
1493 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1494 uurb->buffer += 8;
1495 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1496 is_in = 1;
1497 uurb->endpoint |= USB_DIR_IN;
1498 } else {
1499 is_in = 0;
1500 uurb->endpoint &= ~USB_DIR_IN;
1501 }
1502 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1503 "bRequest=%02x wValue=%04x "
1504 "wIndex=%04x wLength=%04x\n",
1505 dr->bRequestType, dr->bRequest,
1506 __le16_to_cpup(&dr->wValue),
1507 __le16_to_cpup(&dr->wIndex),
1508 __le16_to_cpup(&dr->wLength));
1509 u = sizeof(struct usb_ctrlrequest);
1510 break;
1511
1512 case USBDEVFS_URB_TYPE_BULK:
1513 switch (usb_endpoint_type(&ep->desc)) {
1514 case USB_ENDPOINT_XFER_CONTROL:
1515 case USB_ENDPOINT_XFER_ISOC:
1516 return -EINVAL;
1517 case USB_ENDPOINT_XFER_INT:
1518 /* allow single-shot interrupt transfers */
1519 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1520 goto interrupt_urb;
1521 }
1522 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1523 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1524 num_sgs = 0;
1525 if (ep->streams)
1526 stream_id = uurb->stream_id;
1527 break;
1528
1529 case USBDEVFS_URB_TYPE_INTERRUPT:
1530 if (!usb_endpoint_xfer_int(&ep->desc))
1531 return -EINVAL;
1532 interrupt_urb:
1533 break;
1534
1535 case USBDEVFS_URB_TYPE_ISO:
1536 /* arbitrary limit */
1537 if (uurb->number_of_packets < 1 ||
1538 uurb->number_of_packets > 128)
1539 return -EINVAL;
1540 if (!usb_endpoint_xfer_isoc(&ep->desc))
1541 return -EINVAL;
1542 number_of_packets = uurb->number_of_packets;
1543 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1544 number_of_packets;
1545 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1546 if (IS_ERR(isopkt)) {
1547 ret = PTR_ERR(isopkt);
1548 isopkt = NULL;
1549 goto error;
1550 }
1551 for (totlen = u = 0; u < number_of_packets; u++) {
1552 /*
1553 * arbitrary limit need for USB 3.0
1554 * bMaxBurst (0~15 allowed, 1~16 packets)
1555 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1556 * sizemax: 1024 * 16 * 3 = 49152
1557 */
1558 if (isopkt[u].length > 49152) {
1559 ret = -EINVAL;
1560 goto error;
1561 }
1562 totlen += isopkt[u].length;
1563 }
1564 u *= sizeof(struct usb_iso_packet_descriptor);
1565 uurb->buffer_length = totlen;
1566 break;
1567
1568 default:
1569 return -EINVAL;
1570 }
1571
1572 if (uurb->buffer_length > 0 &&
1573 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1574 uurb->buffer, uurb->buffer_length)) {
1575 ret = -EFAULT;
1576 goto error;
1577 }
1578 as = alloc_async(number_of_packets);
1579 if (!as) {
1580 ret = -ENOMEM;
1581 goto error;
1582 }
1583
1584 as->usbm = find_memory_area(ps, uurb);
1585 if (IS_ERR(as->usbm)) {
1586 ret = PTR_ERR(as->usbm);
1587 as->usbm = NULL;
1588 goto error;
1589 }
1590
1591 /* do not use SG buffers when memory mapped segments
1592 * are in use
1593 */
1594 if (as->usbm)
1595 num_sgs = 0;
1596
1597 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1598 num_sgs * sizeof(struct scatterlist);
1599 ret = usbfs_increase_memory_usage(u);
1600 if (ret)
1601 goto error;
1602 as->mem_usage = u;
1603
1604 if (num_sgs) {
1605 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1606 GFP_KERNEL);
1607 if (!as->urb->sg) {
1608 ret = -ENOMEM;
1609 goto error;
1610 }
1611 as->urb->num_sgs = num_sgs;
1612 sg_init_table(as->urb->sg, as->urb->num_sgs);
1613
1614 totlen = uurb->buffer_length;
1615 for (i = 0; i < as->urb->num_sgs; i++) {
1616 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1617 buf = kmalloc(u, GFP_KERNEL);
1618 if (!buf) {
1619 ret = -ENOMEM;
1620 goto error;
1621 }
1622 sg_set_buf(&as->urb->sg[i], buf, u);
1623
1624 if (!is_in) {
1625 if (copy_from_user(buf, uurb->buffer, u)) {
1626 ret = -EFAULT;
1627 goto error;
1628 }
1629 uurb->buffer += u;
1630 }
1631 totlen -= u;
1632 }
1633 } else if (uurb->buffer_length > 0) {
1634 if (as->usbm) {
1635 unsigned long uurb_start = (unsigned long)uurb->buffer;
1636
1637 as->urb->transfer_buffer = as->usbm->mem +
1638 (uurb_start - as->usbm->vm_start);
1639 } else {
1640 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1641 GFP_KERNEL);
1642 if (!as->urb->transfer_buffer) {
1643 ret = -ENOMEM;
1644 goto error;
1645 }
1646 if (!is_in) {
1647 if (copy_from_user(as->urb->transfer_buffer,
1648 uurb->buffer,
1649 uurb->buffer_length)) {
1650 ret = -EFAULT;
1651 goto error;
1652 }
1653 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1654 /*
1655 * Isochronous input data may end up being
1656 * discontiguous if some of the packets are
1657 * short. Clear the buffer so that the gaps
1658 * don't leak kernel data to userspace.
1659 */
1660 memset(as->urb->transfer_buffer, 0,
1661 uurb->buffer_length);
1662 }
1663 }
1664 }
1665 as->urb->dev = ps->dev;
1666 as->urb->pipe = (uurb->type << 30) |
1667 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1668 (uurb->endpoint & USB_DIR_IN);
1669
1670 /* This tedious sequence is necessary because the URB_* flags
1671 * are internal to the kernel and subject to change, whereas
1672 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1673 */
1674 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1675 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1676 u |= URB_ISO_ASAP;
1677 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1678 u |= URB_SHORT_NOT_OK;
1679 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1680 u |= URB_ZERO_PACKET;
1681 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1682 u |= URB_NO_INTERRUPT;
1683 as->urb->transfer_flags = u;
1684
1685 as->urb->transfer_buffer_length = uurb->buffer_length;
1686 as->urb->setup_packet = (unsigned char *)dr;
1687 dr = NULL;
1688 as->urb->start_frame = uurb->start_frame;
1689 as->urb->number_of_packets = number_of_packets;
1690 as->urb->stream_id = stream_id;
1691
1692 if (ep->desc.bInterval) {
1693 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1694 ps->dev->speed == USB_SPEED_HIGH ||
1695 ps->dev->speed >= USB_SPEED_SUPER)
1696 as->urb->interval = 1 <<
1697 min(15, ep->desc.bInterval - 1);
1698 else
1699 as->urb->interval = ep->desc.bInterval;
1700 }
1701
1702 as->urb->context = as;
1703 as->urb->complete = async_completed;
1704 for (totlen = u = 0; u < number_of_packets; u++) {
1705 as->urb->iso_frame_desc[u].offset = totlen;
1706 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1707 totlen += isopkt[u].length;
1708 }
1709 kfree(isopkt);
1710 isopkt = NULL;
1711 as->ps = ps;
1712 as->userurb = arg;
1713 if (as->usbm) {
1714 unsigned long uurb_start = (unsigned long)uurb->buffer;
1715
1716 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1717 as->urb->transfer_dma = as->usbm->dma_handle +
1718 (uurb_start - as->usbm->vm_start);
1719 } else if (is_in && uurb->buffer_length > 0)
1720 as->userbuffer = uurb->buffer;
1721 as->signr = uurb->signr;
1722 as->ifnum = ifnum;
1723 as->pid = get_pid(task_pid(current));
1724 as->cred = get_current_cred();
1725 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1726 as->urb->transfer_buffer_length, 0, SUBMIT,
1727 NULL, 0);
1728 if (!is_in)
1729 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1730
1731 async_newpending(as);
1732
1733 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1734 spin_lock_irq(&ps->lock);
1735
1736 /* Not exactly the endpoint address; the direction bit is
1737 * shifted to the 0x10 position so that the value will be
1738 * between 0 and 31.
1739 */
1740 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1741 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1742 >> 3);
1743
1744 /* If this bulk URB is the start of a new transfer, re-enable
1745 * the endpoint. Otherwise mark it as a continuation URB.
1746 */
1747 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1748 as->bulk_status = AS_CONTINUATION;
1749 else
1750 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1751
1752 /* Don't accept continuation URBs if the endpoint is
1753 * disabled because of an earlier error.
1754 */
1755 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1756 ret = -EREMOTEIO;
1757 else
1758 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1759 spin_unlock_irq(&ps->lock);
1760 } else {
1761 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1762 }
1763
1764 if (ret) {
1765 dev_printk(KERN_DEBUG, &ps->dev->dev,
1766 "usbfs: usb_submit_urb returned %d\n", ret);
1767 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1768 0, ret, COMPLETE, NULL, 0);
1769 async_removepending(as);
1770 goto error;
1771 }
1772 return 0;
1773
1774 error:
1775 if (as && as->usbm)
1776 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1777 kfree(isopkt);
1778 kfree(dr);
1779 if (as)
1780 free_async(as);
1781 return ret;
1782}
1783
1784static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1785{
1786 struct usbdevfs_urb uurb;
1787
1788 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1789 return -EFAULT;
1790
1791 return proc_do_submiturb(ps, &uurb,
1792 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1793 arg);
1794}
1795
1796static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1797{
1798 struct urb *urb;
1799 struct async *as;
1800 unsigned long flags;
1801
1802 spin_lock_irqsave(&ps->lock, flags);
1803 as = async_getpending(ps, arg);
1804 if (!as) {
1805 spin_unlock_irqrestore(&ps->lock, flags);
1806 return -EINVAL;
1807 }
1808
1809 urb = as->urb;
1810 usb_get_urb(urb);
1811 spin_unlock_irqrestore(&ps->lock, flags);
1812
1813 usb_kill_urb(urb);
1814 usb_put_urb(urb);
1815
1816 return 0;
1817}
1818
1819static void compute_isochronous_actual_length(struct urb *urb)
1820{
1821 unsigned int i;
1822
1823 if (urb->number_of_packets > 0) {
1824 urb->actual_length = 0;
1825 for (i = 0; i < urb->number_of_packets; i++)
1826 urb->actual_length +=
1827 urb->iso_frame_desc[i].actual_length;
1828 }
1829}
1830
1831static int processcompl(struct async *as, void __user * __user *arg)
1832{
1833 struct urb *urb = as->urb;
1834 struct usbdevfs_urb __user *userurb = as->userurb;
1835 void __user *addr = as->userurb;
1836 unsigned int i;
1837
1838 compute_isochronous_actual_length(urb);
1839 if (as->userbuffer && urb->actual_length) {
1840 if (copy_urb_data_to_user(as->userbuffer, urb))
1841 goto err_out;
1842 }
1843 if (put_user(as->status, &userurb->status))
1844 goto err_out;
1845 if (put_user(urb->actual_length, &userurb->actual_length))
1846 goto err_out;
1847 if (put_user(urb->error_count, &userurb->error_count))
1848 goto err_out;
1849
1850 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1851 for (i = 0; i < urb->number_of_packets; i++) {
1852 if (put_user(urb->iso_frame_desc[i].actual_length,
1853 &userurb->iso_frame_desc[i].actual_length))
1854 goto err_out;
1855 if (put_user(urb->iso_frame_desc[i].status,
1856 &userurb->iso_frame_desc[i].status))
1857 goto err_out;
1858 }
1859 }
1860
1861 if (put_user(addr, (void __user * __user *)arg))
1862 return -EFAULT;
1863 return 0;
1864
1865err_out:
1866 return -EFAULT;
1867}
1868
1869static struct async *reap_as(struct usb_dev_state *ps)
1870{
1871 DECLARE_WAITQUEUE(wait, current);
1872 struct async *as = NULL;
1873 struct usb_device *dev = ps->dev;
1874
1875 add_wait_queue(&ps->wait, &wait);
1876 for (;;) {
1877 __set_current_state(TASK_INTERRUPTIBLE);
1878 as = async_getcompleted(ps);
1879 if (as || !connected(ps))
1880 break;
1881 if (signal_pending(current))
1882 break;
1883 usb_unlock_device(dev);
1884 schedule();
1885 usb_lock_device(dev);
1886 }
1887 remove_wait_queue(&ps->wait, &wait);
1888 set_current_state(TASK_RUNNING);
1889 return as;
1890}
1891
1892static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1893{
1894 struct async *as = reap_as(ps);
1895
1896 if (as) {
1897 int retval;
1898
1899 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1900 retval = processcompl(as, (void __user * __user *)arg);
1901 free_async(as);
1902 return retval;
1903 }
1904 if (signal_pending(current))
1905 return -EINTR;
1906 return -ENODEV;
1907}
1908
1909static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1910{
1911 int retval;
1912 struct async *as;
1913
1914 as = async_getcompleted(ps);
1915 if (as) {
1916 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1917 retval = processcompl(as, (void __user * __user *)arg);
1918 free_async(as);
1919 } else {
1920 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1921 }
1922 return retval;
1923}
1924
1925#ifdef CONFIG_COMPAT
1926static int proc_control_compat(struct usb_dev_state *ps,
1927 struct usbdevfs_ctrltransfer32 __user *p32)
1928{
1929 struct usbdevfs_ctrltransfer __user *p;
1930 __u32 udata;
1931 p = compat_alloc_user_space(sizeof(*p));
1932 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1933 get_user(udata, &p32->data) ||
1934 put_user(compat_ptr(udata), &p->data))
1935 return -EFAULT;
1936 return proc_control(ps, p);
1937}
1938
1939static int proc_bulk_compat(struct usb_dev_state *ps,
1940 struct usbdevfs_bulktransfer32 __user *p32)
1941{
1942 struct usbdevfs_bulktransfer __user *p;
1943 compat_uint_t n;
1944 compat_caddr_t addr;
1945
1946 p = compat_alloc_user_space(sizeof(*p));
1947
1948 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1949 get_user(n, &p32->len) || put_user(n, &p->len) ||
1950 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1951 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1952 return -EFAULT;
1953
1954 return proc_bulk(ps, p);
1955}
1956static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1957{
1958 struct usbdevfs_disconnectsignal32 ds;
1959
1960 if (copy_from_user(&ds, arg, sizeof(ds)))
1961 return -EFAULT;
1962 ps->discsignr = ds.signr;
1963 ps->disccontext = compat_ptr(ds.context);
1964 return 0;
1965}
1966
1967static int get_urb32(struct usbdevfs_urb *kurb,
1968 struct usbdevfs_urb32 __user *uurb)
1969{
1970 struct usbdevfs_urb32 urb32;
1971 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1972 return -EFAULT;
1973 kurb->type = urb32.type;
1974 kurb->endpoint = urb32.endpoint;
1975 kurb->status = urb32.status;
1976 kurb->flags = urb32.flags;
1977 kurb->buffer = compat_ptr(urb32.buffer);
1978 kurb->buffer_length = urb32.buffer_length;
1979 kurb->actual_length = urb32.actual_length;
1980 kurb->start_frame = urb32.start_frame;
1981 kurb->number_of_packets = urb32.number_of_packets;
1982 kurb->error_count = urb32.error_count;
1983 kurb->signr = urb32.signr;
1984 kurb->usercontext = compat_ptr(urb32.usercontext);
1985 return 0;
1986}
1987
1988static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1989{
1990 struct usbdevfs_urb uurb;
1991
1992 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1993 return -EFAULT;
1994
1995 return proc_do_submiturb(ps, &uurb,
1996 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1997 arg);
1998}
1999
2000static int processcompl_compat(struct async *as, void __user * __user *arg)
2001{
2002 struct urb *urb = as->urb;
2003 struct usbdevfs_urb32 __user *userurb = as->userurb;
2004 void __user *addr = as->userurb;
2005 unsigned int i;
2006
2007 compute_isochronous_actual_length(urb);
2008 if (as->userbuffer && urb->actual_length) {
2009 if (copy_urb_data_to_user(as->userbuffer, urb))
2010 return -EFAULT;
2011 }
2012 if (put_user(as->status, &userurb->status))
2013 return -EFAULT;
2014 if (put_user(urb->actual_length, &userurb->actual_length))
2015 return -EFAULT;
2016 if (put_user(urb->error_count, &userurb->error_count))
2017 return -EFAULT;
2018
2019 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2020 for (i = 0; i < urb->number_of_packets; i++) {
2021 if (put_user(urb->iso_frame_desc[i].actual_length,
2022 &userurb->iso_frame_desc[i].actual_length))
2023 return -EFAULT;
2024 if (put_user(urb->iso_frame_desc[i].status,
2025 &userurb->iso_frame_desc[i].status))
2026 return -EFAULT;
2027 }
2028 }
2029
2030 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2031 return -EFAULT;
2032 return 0;
2033}
2034
2035static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2036{
2037 struct async *as = reap_as(ps);
2038
2039 if (as) {
2040 int retval;
2041
2042 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2043 retval = processcompl_compat(as, (void __user * __user *)arg);
2044 free_async(as);
2045 return retval;
2046 }
2047 if (signal_pending(current))
2048 return -EINTR;
2049 return -ENODEV;
2050}
2051
2052static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2053{
2054 int retval;
2055 struct async *as;
2056
2057 as = async_getcompleted(ps);
2058 if (as) {
2059 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2060 retval = processcompl_compat(as, (void __user * __user *)arg);
2061 free_async(as);
2062 } else {
2063 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2064 }
2065 return retval;
2066}
2067
2068
2069#endif
2070
2071static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2072{
2073 struct usbdevfs_disconnectsignal ds;
2074
2075 if (copy_from_user(&ds, arg, sizeof(ds)))
2076 return -EFAULT;
2077 ps->discsignr = ds.signr;
2078 ps->disccontext = ds.context;
2079 return 0;
2080}
2081
2082static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2083{
2084 unsigned int ifnum;
2085
2086 if (get_user(ifnum, (unsigned int __user *)arg))
2087 return -EFAULT;
2088 return claimintf(ps, ifnum);
2089}
2090
2091static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2092{
2093 unsigned int ifnum;
2094 int ret;
2095
2096 if (get_user(ifnum, (unsigned int __user *)arg))
2097 return -EFAULT;
2098 ret = releaseintf(ps, ifnum);
2099 if (ret < 0)
2100 return ret;
2101 destroy_async_on_interface(ps, ifnum);
2102 return 0;
2103}
2104
2105static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2106{
2107 int size;
2108 void *buf = NULL;
2109 int retval = 0;
2110 struct usb_interface *intf = NULL;
2111 struct usb_driver *driver = NULL;
2112
2113 if (ps->privileges_dropped)
2114 return -EACCES;
2115
2116 /* alloc buffer */
2117 size = _IOC_SIZE(ctl->ioctl_code);
2118 if (size > 0) {
2119 buf = kmalloc(size, GFP_KERNEL);
2120 if (buf == NULL)
2121 return -ENOMEM;
2122 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2123 if (copy_from_user(buf, ctl->data, size)) {
2124 kfree(buf);
2125 return -EFAULT;
2126 }
2127 } else {
2128 memset(buf, 0, size);
2129 }
2130 }
2131
2132 if (!connected(ps)) {
2133 kfree(buf);
2134 return -ENODEV;
2135 }
2136
2137 if (ps->dev->state != USB_STATE_CONFIGURED)
2138 retval = -EHOSTUNREACH;
2139 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2140 retval = -EINVAL;
2141 else switch (ctl->ioctl_code) {
2142
2143 /* disconnect kernel driver from interface */
2144 case USBDEVFS_DISCONNECT:
2145 if (intf->dev.driver) {
2146 driver = to_usb_driver(intf->dev.driver);
2147 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2148 usb_driver_release_interface(driver, intf);
2149 } else
2150 retval = -ENODATA;
2151 break;
2152
2153 /* let kernel drivers try to (re)bind to the interface */
2154 case USBDEVFS_CONNECT:
2155 if (!intf->dev.driver)
2156 retval = device_attach(&intf->dev);
2157 else
2158 retval = -EBUSY;
2159 break;
2160
2161 /* talk directly to the interface's driver */
2162 default:
2163 if (intf->dev.driver)
2164 driver = to_usb_driver(intf->dev.driver);
2165 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2166 retval = -ENOTTY;
2167 } else {
2168 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2169 if (retval == -ENOIOCTLCMD)
2170 retval = -ENOTTY;
2171 }
2172 }
2173
2174 /* cleanup and return */
2175 if (retval >= 0
2176 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2177 && size > 0
2178 && copy_to_user(ctl->data, buf, size) != 0)
2179 retval = -EFAULT;
2180
2181 kfree(buf);
2182 return retval;
2183}
2184
2185static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2186{
2187 struct usbdevfs_ioctl ctrl;
2188
2189 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2190 return -EFAULT;
2191 return proc_ioctl(ps, &ctrl);
2192}
2193
2194#ifdef CONFIG_COMPAT
2195static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2196{
2197 struct usbdevfs_ioctl32 ioc32;
2198 struct usbdevfs_ioctl ctrl;
2199
2200 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2201 return -EFAULT;
2202 ctrl.ifno = ioc32.ifno;
2203 ctrl.ioctl_code = ioc32.ioctl_code;
2204 ctrl.data = compat_ptr(ioc32.data);
2205 return proc_ioctl(ps, &ctrl);
2206}
2207#endif
2208
2209static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2210{
2211 unsigned portnum;
2212 int rc;
2213
2214 if (get_user(portnum, (unsigned __user *) arg))
2215 return -EFAULT;
2216 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2217 if (rc == 0)
2218 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2219 portnum, task_pid_nr(current), current->comm);
2220 return rc;
2221}
2222
2223static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2224{
2225 unsigned portnum;
2226
2227 if (get_user(portnum, (unsigned __user *) arg))
2228 return -EFAULT;
2229 return usb_hub_release_port(ps->dev, portnum, ps);
2230}
2231
2232static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2233{
2234 __u32 caps;
2235
2236 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2237 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2238 USBDEVFS_CAP_DROP_PRIVILEGES;
2239 if (!ps->dev->bus->no_stop_on_short)
2240 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2241 if (ps->dev->bus->sg_tablesize)
2242 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2243
2244 if (put_user(caps, (__u32 __user *)arg))
2245 return -EFAULT;
2246
2247 return 0;
2248}
2249
2250static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2251{
2252 struct usbdevfs_disconnect_claim dc;
2253 struct usb_interface *intf;
2254
2255 if (copy_from_user(&dc, arg, sizeof(dc)))
2256 return -EFAULT;
2257
2258 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2259 if (!intf)
2260 return -EINVAL;
2261
2262 if (intf->dev.driver) {
2263 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2264
2265 if (ps->privileges_dropped)
2266 return -EACCES;
2267
2268 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2269 strncmp(dc.driver, intf->dev.driver->name,
2270 sizeof(dc.driver)) != 0)
2271 return -EBUSY;
2272
2273 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2274 strncmp(dc.driver, intf->dev.driver->name,
2275 sizeof(dc.driver)) == 0)
2276 return -EBUSY;
2277
2278 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2279 usb_driver_release_interface(driver, intf);
2280 }
2281
2282 return claimintf(ps, dc.interface);
2283}
2284
2285static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2286{
2287 unsigned num_streams, num_eps;
2288 struct usb_host_endpoint **eps;
2289 struct usb_interface *intf;
2290 int r;
2291
2292 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2293 &eps, &intf);
2294 if (r)
2295 return r;
2296
2297 destroy_async_on_interface(ps,
2298 intf->altsetting[0].desc.bInterfaceNumber);
2299
2300 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2301 kfree(eps);
2302 return r;
2303}
2304
2305static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2306{
2307 unsigned num_eps;
2308 struct usb_host_endpoint **eps;
2309 struct usb_interface *intf;
2310 int r;
2311
2312 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2313 if (r)
2314 return r;
2315
2316 destroy_async_on_interface(ps,
2317 intf->altsetting[0].desc.bInterfaceNumber);
2318
2319 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2320 kfree(eps);
2321 return r;
2322}
2323
2324static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2325{
2326 u32 data;
2327
2328 if (copy_from_user(&data, arg, sizeof(data)))
2329 return -EFAULT;
2330
2331 /* This is a one way operation. Once privileges are
2332 * dropped, you cannot regain them. You may however reissue
2333 * this ioctl to shrink the allowed interfaces mask.
2334 */
2335 ps->interface_allowed_mask &= data;
2336 ps->privileges_dropped = true;
2337
2338 return 0;
2339}
2340
2341/*
2342 * NOTE: All requests here that have interface numbers as parameters
2343 * are assuming that somehow the configuration has been prevented from
2344 * changing. But there's no mechanism to ensure that...
2345 */
2346static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2347 void __user *p)
2348{
2349 struct usb_dev_state *ps = file->private_data;
2350 struct inode *inode = file_inode(file);
2351 struct usb_device *dev = ps->dev;
2352 int ret = -ENOTTY;
2353
2354 if (!(file->f_mode & FMODE_WRITE))
2355 return -EPERM;
2356
2357 usb_lock_device(dev);
2358
2359 /* Reap operations are allowed even after disconnection */
2360 switch (cmd) {
2361 case USBDEVFS_REAPURB:
2362 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2363 ret = proc_reapurb(ps, p);
2364 goto done;
2365
2366 case USBDEVFS_REAPURBNDELAY:
2367 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2368 ret = proc_reapurbnonblock(ps, p);
2369 goto done;
2370
2371#ifdef CONFIG_COMPAT
2372 case USBDEVFS_REAPURB32:
2373 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2374 ret = proc_reapurb_compat(ps, p);
2375 goto done;
2376
2377 case USBDEVFS_REAPURBNDELAY32:
2378 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2379 ret = proc_reapurbnonblock_compat(ps, p);
2380 goto done;
2381#endif
2382 }
2383
2384 if (!connected(ps)) {
2385 usb_unlock_device(dev);
2386 return -ENODEV;
2387 }
2388
2389 switch (cmd) {
2390 case USBDEVFS_CONTROL:
2391 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2392 ret = proc_control(ps, p);
2393 if (ret >= 0)
2394 inode->i_mtime = current_time(inode);
2395 break;
2396
2397 case USBDEVFS_BULK:
2398 snoop(&dev->dev, "%s: BULK\n", __func__);
2399 ret = proc_bulk(ps, p);
2400 if (ret >= 0)
2401 inode->i_mtime = current_time(inode);
2402 break;
2403
2404 case USBDEVFS_RESETEP:
2405 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2406 ret = proc_resetep(ps, p);
2407 if (ret >= 0)
2408 inode->i_mtime = current_time(inode);
2409 break;
2410
2411 case USBDEVFS_RESET:
2412 snoop(&dev->dev, "%s: RESET\n", __func__);
2413 ret = proc_resetdevice(ps);
2414 break;
2415
2416 case USBDEVFS_CLEAR_HALT:
2417 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2418 ret = proc_clearhalt(ps, p);
2419 if (ret >= 0)
2420 inode->i_mtime = current_time(inode);
2421 break;
2422
2423 case USBDEVFS_GETDRIVER:
2424 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2425 ret = proc_getdriver(ps, p);
2426 break;
2427
2428 case USBDEVFS_CONNECTINFO:
2429 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2430 ret = proc_connectinfo(ps, p);
2431 break;
2432
2433 case USBDEVFS_SETINTERFACE:
2434 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2435 ret = proc_setintf(ps, p);
2436 break;
2437
2438 case USBDEVFS_SETCONFIGURATION:
2439 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2440 ret = proc_setconfig(ps, p);
2441 break;
2442
2443 case USBDEVFS_SUBMITURB:
2444 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2445 ret = proc_submiturb(ps, p);
2446 if (ret >= 0)
2447 inode->i_mtime = current_time(inode);
2448 break;
2449
2450#ifdef CONFIG_COMPAT
2451 case USBDEVFS_CONTROL32:
2452 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2453 ret = proc_control_compat(ps, p);
2454 if (ret >= 0)
2455 inode->i_mtime = current_time(inode);
2456 break;
2457
2458 case USBDEVFS_BULK32:
2459 snoop(&dev->dev, "%s: BULK32\n", __func__);
2460 ret = proc_bulk_compat(ps, p);
2461 if (ret >= 0)
2462 inode->i_mtime = current_time(inode);
2463 break;
2464
2465 case USBDEVFS_DISCSIGNAL32:
2466 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2467 ret = proc_disconnectsignal_compat(ps, p);
2468 break;
2469
2470 case USBDEVFS_SUBMITURB32:
2471 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2472 ret = proc_submiturb_compat(ps, p);
2473 if (ret >= 0)
2474 inode->i_mtime = current_time(inode);
2475 break;
2476
2477 case USBDEVFS_IOCTL32:
2478 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2479 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2480 break;
2481#endif
2482
2483 case USBDEVFS_DISCARDURB:
2484 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2485 ret = proc_unlinkurb(ps, p);
2486 break;
2487
2488 case USBDEVFS_DISCSIGNAL:
2489 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2490 ret = proc_disconnectsignal(ps, p);
2491 break;
2492
2493 case USBDEVFS_CLAIMINTERFACE:
2494 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2495 ret = proc_claiminterface(ps, p);
2496 break;
2497
2498 case USBDEVFS_RELEASEINTERFACE:
2499 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2500 ret = proc_releaseinterface(ps, p);
2501 break;
2502
2503 case USBDEVFS_IOCTL:
2504 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2505 ret = proc_ioctl_default(ps, p);
2506 break;
2507
2508 case USBDEVFS_CLAIM_PORT:
2509 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2510 ret = proc_claim_port(ps, p);
2511 break;
2512
2513 case USBDEVFS_RELEASE_PORT:
2514 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2515 ret = proc_release_port(ps, p);
2516 break;
2517 case USBDEVFS_GET_CAPABILITIES:
2518 ret = proc_get_capabilities(ps, p);
2519 break;
2520 case USBDEVFS_DISCONNECT_CLAIM:
2521 ret = proc_disconnect_claim(ps, p);
2522 break;
2523 case USBDEVFS_ALLOC_STREAMS:
2524 ret = proc_alloc_streams(ps, p);
2525 break;
2526 case USBDEVFS_FREE_STREAMS:
2527 ret = proc_free_streams(ps, p);
2528 break;
2529 case USBDEVFS_DROP_PRIVILEGES:
2530 ret = proc_drop_privileges(ps, p);
2531 break;
2532 case USBDEVFS_GET_SPEED:
2533 ret = ps->dev->speed;
2534 break;
2535 }
2536
2537 done:
2538 usb_unlock_device(dev);
2539 if (ret >= 0)
2540 inode->i_atime = current_time(inode);
2541 return ret;
2542}
2543
2544static long usbdev_ioctl(struct file *file, unsigned int cmd,
2545 unsigned long arg)
2546{
2547 int ret;
2548
2549 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2550
2551 return ret;
2552}
2553
2554#ifdef CONFIG_COMPAT
2555static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2556 unsigned long arg)
2557{
2558 int ret;
2559
2560 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2561
2562 return ret;
2563}
2564#endif
2565
2566/* No kernel lock - fine */
2567static __poll_t usbdev_poll(struct file *file,
2568 struct poll_table_struct *wait)
2569{
2570 struct usb_dev_state *ps = file->private_data;
2571 __poll_t mask = 0;
2572
2573 poll_wait(file, &ps->wait, wait);
2574 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2575 mask |= EPOLLOUT | EPOLLWRNORM;
2576 if (!connected(ps))
2577 mask |= EPOLLHUP;
2578 if (list_empty(&ps->list))
2579 mask |= EPOLLERR;
2580 return mask;
2581}
2582
2583const struct file_operations usbdev_file_operations = {
2584 .owner = THIS_MODULE,
2585 .llseek = no_seek_end_llseek,
2586 .read = usbdev_read,
2587 .poll = usbdev_poll,
2588 .unlocked_ioctl = usbdev_ioctl,
2589#ifdef CONFIG_COMPAT
2590 .compat_ioctl = usbdev_compat_ioctl,
2591#endif
2592 .mmap = usbdev_mmap,
2593 .open = usbdev_open,
2594 .release = usbdev_release,
2595};
2596
2597static void usbdev_remove(struct usb_device *udev)
2598{
2599 struct usb_dev_state *ps;
2600 struct siginfo sinfo;
2601
2602 while (!list_empty(&udev->filelist)) {
2603 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2604 destroy_all_async(ps);
2605 wake_up_all(&ps->wait);
2606 list_del_init(&ps->list);
2607 if (ps->discsignr) {
2608 clear_siginfo(&sinfo);
2609 sinfo.si_signo = ps->discsignr;
2610 sinfo.si_errno = EPIPE;
2611 sinfo.si_code = SI_ASYNCIO;
2612 sinfo.si_addr = ps->disccontext;
2613 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2614 ps->disc_pid, ps->cred);
2615 }
2616 }
2617}
2618
2619static int usbdev_notify(struct notifier_block *self,
2620 unsigned long action, void *dev)
2621{
2622 switch (action) {
2623 case USB_DEVICE_ADD:
2624 break;
2625 case USB_DEVICE_REMOVE:
2626 usbdev_remove(dev);
2627 break;
2628 }
2629 return NOTIFY_OK;
2630}
2631
2632static struct notifier_block usbdev_nb = {
2633 .notifier_call = usbdev_notify,
2634};
2635
2636static struct cdev usb_device_cdev;
2637
2638int __init usb_devio_init(void)
2639{
2640 int retval;
2641
2642 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2643 "usb_device");
2644 if (retval) {
2645 printk(KERN_ERR "Unable to register minors for usb_device\n");
2646 goto out;
2647 }
2648 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2649 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2650 if (retval) {
2651 printk(KERN_ERR "Unable to get usb_device major %d\n",
2652 USB_DEVICE_MAJOR);
2653 goto error_cdev;
2654 }
2655 usb_register_notify(&usbdev_nb);
2656out:
2657 return retval;
2658
2659error_cdev:
2660 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2661 goto out;
2662}
2663
2664void usb_devio_cleanup(void)
2665{
2666 usb_unregister_notify(&usbdev_nb);
2667 cdev_del(&usb_device_cdev);
2668 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2669}