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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 size_t size = vma->vm_end - vma->vm_start;
221 void *mem;
222 unsigned long flags;
223 dma_addr_t dma_handle;
224 int ret;
225
226 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
227 if (ret)
228 goto error;
229
230 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
231 if (!usbm) {
232 ret = -ENOMEM;
233 goto error_decrease_mem;
234 }
235
236 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
237 &dma_handle);
238 if (!mem) {
239 ret = -ENOMEM;
240 goto error_free_usbm;
241 }
242
243 memset(mem, 0, size);
244
245 usbm->mem = mem;
246 usbm->dma_handle = dma_handle;
247 usbm->size = size;
248 usbm->ps = ps;
249 usbm->vm_start = vma->vm_start;
250 usbm->vma_use_count = 1;
251 INIT_LIST_HEAD(&usbm->memlist);
252
253 if (remap_pfn_range(vma, vma->vm_start,
254 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
255 size, vma->vm_page_prot) < 0) {
256 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
257 return -EAGAIN;
258 }
259
260 vma->vm_flags |= VM_IO;
261 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
262 vma->vm_ops = &usbdev_vm_ops;
263 vma->vm_private_data = usbm;
264
265 spin_lock_irqsave(&ps->lock, flags);
266 list_add_tail(&usbm->memlist, &ps->memory_list);
267 spin_unlock_irqrestore(&ps->lock, flags);
268
269 return 0;
270
271error_free_usbm:
272 kfree(usbm);
273error_decrease_mem:
274 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
275error:
276 return ret;
277}
278
279static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
280 loff_t *ppos)
281{
282 struct usb_dev_state *ps = file->private_data;
283 struct usb_device *dev = ps->dev;
284 ssize_t ret = 0;
285 unsigned len;
286 loff_t pos;
287 int i;
288
289 pos = *ppos;
290 usb_lock_device(dev);
291 if (!connected(ps)) {
292 ret = -ENODEV;
293 goto err;
294 } else if (pos < 0) {
295 ret = -EINVAL;
296 goto err;
297 }
298
299 if (pos < sizeof(struct usb_device_descriptor)) {
300 /* 18 bytes - fits on the stack */
301 struct usb_device_descriptor temp_desc;
302
303 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
304 le16_to_cpus(&temp_desc.bcdUSB);
305 le16_to_cpus(&temp_desc.idVendor);
306 le16_to_cpus(&temp_desc.idProduct);
307 le16_to_cpus(&temp_desc.bcdDevice);
308
309 len = sizeof(struct usb_device_descriptor) - pos;
310 if (len > nbytes)
311 len = nbytes;
312 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
313 ret = -EFAULT;
314 goto err;
315 }
316
317 *ppos += len;
318 buf += len;
319 nbytes -= len;
320 ret += len;
321 }
322
323 pos = sizeof(struct usb_device_descriptor);
324 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
325 struct usb_config_descriptor *config =
326 (struct usb_config_descriptor *)dev->rawdescriptors[i];
327 unsigned int length = le16_to_cpu(config->wTotalLength);
328
329 if (*ppos < pos + length) {
330
331 /* The descriptor may claim to be longer than it
332 * really is. Here is the actual allocated length. */
333 unsigned alloclen =
334 le16_to_cpu(dev->config[i].desc.wTotalLength);
335
336 len = length - (*ppos - pos);
337 if (len > nbytes)
338 len = nbytes;
339
340 /* Simply don't write (skip over) unallocated parts */
341 if (alloclen > (*ppos - pos)) {
342 alloclen -= (*ppos - pos);
343 if (copy_to_user(buf,
344 dev->rawdescriptors[i] + (*ppos - pos),
345 min(len, alloclen))) {
346 ret = -EFAULT;
347 goto err;
348 }
349 }
350
351 *ppos += len;
352 buf += len;
353 nbytes -= len;
354 ret += len;
355 }
356
357 pos += length;
358 }
359
360err:
361 usb_unlock_device(dev);
362 return ret;
363}
364
365/*
366 * async list handling
367 */
368
369static struct async *alloc_async(unsigned int numisoframes)
370{
371 struct async *as;
372
373 as = kzalloc(sizeof(struct async), GFP_KERNEL);
374 if (!as)
375 return NULL;
376 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
377 if (!as->urb) {
378 kfree(as);
379 return NULL;
380 }
381 return as;
382}
383
384static void free_async(struct async *as)
385{
386 int i;
387
388 put_pid(as->pid);
389 if (as->cred)
390 put_cred(as->cred);
391 for (i = 0; i < as->urb->num_sgs; i++) {
392 if (sg_page(&as->urb->sg[i]))
393 kfree(sg_virt(&as->urb->sg[i]));
394 }
395
396 kfree(as->urb->sg);
397 if (as->usbm == NULL)
398 kfree(as->urb->transfer_buffer);
399 else
400 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
401
402 kfree(as->urb->setup_packet);
403 usb_free_urb(as->urb);
404 usbfs_decrease_memory_usage(as->mem_usage);
405 kfree(as);
406}
407
408static void async_newpending(struct async *as)
409{
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_add_tail(&as->asynclist, &ps->async_pending);
415 spin_unlock_irqrestore(&ps->lock, flags);
416}
417
418static void async_removepending(struct async *as)
419{
420 struct usb_dev_state *ps = as->ps;
421 unsigned long flags;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 list_del_init(&as->asynclist);
425 spin_unlock_irqrestore(&ps->lock, flags);
426}
427
428static struct async *async_getcompleted(struct usb_dev_state *ps)
429{
430 unsigned long flags;
431 struct async *as = NULL;
432
433 spin_lock_irqsave(&ps->lock, flags);
434 if (!list_empty(&ps->async_completed)) {
435 as = list_entry(ps->async_completed.next, struct async,
436 asynclist);
437 list_del_init(&as->asynclist);
438 }
439 spin_unlock_irqrestore(&ps->lock, flags);
440 return as;
441}
442
443static struct async *async_getpending(struct usb_dev_state *ps,
444 void __user *userurb)
445{
446 struct async *as;
447
448 list_for_each_entry(as, &ps->async_pending, asynclist)
449 if (as->userurb == userurb) {
450 list_del_init(&as->asynclist);
451 return as;
452 }
453
454 return NULL;
455}
456
457static void snoop_urb(struct usb_device *udev,
458 void __user *userurb, int pipe, unsigned length,
459 int timeout_or_status, enum snoop_when when,
460 unsigned char *data, unsigned data_len)
461{
462 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
463 static const char *dirs[] = {"out", "in"};
464 int ep;
465 const char *t, *d;
466
467 if (!usbfs_snoop)
468 return;
469
470 ep = usb_pipeendpoint(pipe);
471 t = types[usb_pipetype(pipe)];
472 d = dirs[!!usb_pipein(pipe)];
473
474 if (userurb) { /* Async */
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
477 "length %u\n",
478 userurb, ep, t, d, length);
479 else
480 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
481 "actual_length %u status %d\n",
482 userurb, ep, t, d, length,
483 timeout_or_status);
484 } else {
485 if (when == SUBMIT)
486 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
487 "timeout %d\n",
488 ep, t, d, length, timeout_or_status);
489 else
490 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
491 "status %d\n",
492 ep, t, d, length, timeout_or_status);
493 }
494
495 data_len = min(data_len, usbfs_snoop_max);
496 if (data && data_len > 0) {
497 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
498 data, data_len, 1);
499 }
500}
501
502static void snoop_urb_data(struct urb *urb, unsigned len)
503{
504 int i, size;
505
506 len = min(len, usbfs_snoop_max);
507 if (!usbfs_snoop || len == 0)
508 return;
509
510 if (urb->num_sgs == 0) {
511 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
512 urb->transfer_buffer, len, 1);
513 return;
514 }
515
516 for (i = 0; i < urb->num_sgs && len; i++) {
517 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
518 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
519 sg_virt(&urb->sg[i]), size, 1);
520 len -= size;
521 }
522}
523
524static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
525{
526 unsigned i, len, size;
527
528 if (urb->number_of_packets > 0) /* Isochronous */
529 len = urb->transfer_buffer_length;
530 else /* Non-Isoc */
531 len = urb->actual_length;
532
533 if (urb->num_sgs == 0) {
534 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
535 return -EFAULT;
536 return 0;
537 }
538
539 for (i = 0; i < urb->num_sgs && len; i++) {
540 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
541 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
542 return -EFAULT;
543 userbuffer += size;
544 len -= size;
545 }
546
547 return 0;
548}
549
550#define AS_CONTINUATION 1
551#define AS_UNLINK 2
552
553static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
554__releases(ps->lock)
555__acquires(ps->lock)
556{
557 struct urb *urb;
558 struct async *as;
559
560 /* Mark all the pending URBs that match bulk_addr, up to but not
561 * including the first one without AS_CONTINUATION. If such an
562 * URB is encountered then a new transfer has already started so
563 * the endpoint doesn't need to be disabled; otherwise it does.
564 */
565 list_for_each_entry(as, &ps->async_pending, asynclist) {
566 if (as->bulk_addr == bulk_addr) {
567 if (as->bulk_status != AS_CONTINUATION)
568 goto rescan;
569 as->bulk_status = AS_UNLINK;
570 as->bulk_addr = 0;
571 }
572 }
573 ps->disabled_bulk_eps |= (1 << bulk_addr);
574
575 /* Now carefully unlink all the marked pending URBs */
576 rescan:
577 list_for_each_entry(as, &ps->async_pending, asynclist) {
578 if (as->bulk_status == AS_UNLINK) {
579 as->bulk_status = 0; /* Only once */
580 urb = as->urb;
581 usb_get_urb(urb);
582 spin_unlock(&ps->lock); /* Allow completions */
583 usb_unlink_urb(urb);
584 usb_put_urb(urb);
585 spin_lock(&ps->lock);
586 goto rescan;
587 }
588 }
589}
590
591static void async_completed(struct urb *urb)
592{
593 struct async *as = urb->context;
594 struct usb_dev_state *ps = as->ps;
595 struct pid *pid = NULL;
596 const struct cred *cred = NULL;
597 unsigned long flags;
598 sigval_t addr;
599 int signr, errno;
600
601 spin_lock_irqsave(&ps->lock, flags);
602 list_move_tail(&as->asynclist, &ps->async_completed);
603 as->status = urb->status;
604 signr = as->signr;
605 if (signr) {
606 errno = as->status;
607 addr = as->userurb_sigval;
608 pid = get_pid(as->pid);
609 cred = get_cred(as->cred);
610 }
611 snoop(&urb->dev->dev, "urb complete\n");
612 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
613 as->status, COMPLETE, NULL, 0);
614 if (usb_urb_dir_in(urb))
615 snoop_urb_data(urb, urb->actual_length);
616
617 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
618 as->status != -ENOENT)
619 cancel_bulk_urbs(ps, as->bulk_addr);
620
621 wake_up(&ps->wait);
622 spin_unlock_irqrestore(&ps->lock, flags);
623
624 if (signr) {
625 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
626 put_pid(pid);
627 put_cred(cred);
628 }
629}
630
631static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
632{
633 struct urb *urb;
634 struct async *as;
635 unsigned long flags;
636
637 spin_lock_irqsave(&ps->lock, flags);
638 while (!list_empty(list)) {
639 as = list_entry(list->next, struct async, asynclist);
640 list_del_init(&as->asynclist);
641 urb = as->urb;
642 usb_get_urb(urb);
643
644 /* drop the spinlock so the completion handler can run */
645 spin_unlock_irqrestore(&ps->lock, flags);
646 usb_kill_urb(urb);
647 usb_put_urb(urb);
648 spin_lock_irqsave(&ps->lock, flags);
649 }
650 spin_unlock_irqrestore(&ps->lock, flags);
651}
652
653static void destroy_async_on_interface(struct usb_dev_state *ps,
654 unsigned int ifnum)
655{
656 struct list_head *p, *q, hitlist;
657 unsigned long flags;
658
659 INIT_LIST_HEAD(&hitlist);
660 spin_lock_irqsave(&ps->lock, flags);
661 list_for_each_safe(p, q, &ps->async_pending)
662 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
663 list_move_tail(p, &hitlist);
664 spin_unlock_irqrestore(&ps->lock, flags);
665 destroy_async(ps, &hitlist);
666}
667
668static void destroy_all_async(struct usb_dev_state *ps)
669{
670 destroy_async(ps, &ps->async_pending);
671}
672
673/*
674 * interface claims are made only at the request of user level code,
675 * which can also release them (explicitly or by closing files).
676 * they're also undone when devices disconnect.
677 */
678
679static int driver_probe(struct usb_interface *intf,
680 const struct usb_device_id *id)
681{
682 return -ENODEV;
683}
684
685static void driver_disconnect(struct usb_interface *intf)
686{
687 struct usb_dev_state *ps = usb_get_intfdata(intf);
688 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
689
690 if (!ps)
691 return;
692
693 /* NOTE: this relies on usbcore having canceled and completed
694 * all pending I/O requests; 2.6 does that.
695 */
696
697 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
698 clear_bit(ifnum, &ps->ifclaimed);
699 else
700 dev_warn(&intf->dev, "interface number %u out of range\n",
701 ifnum);
702
703 usb_set_intfdata(intf, NULL);
704
705 /* force async requests to complete */
706 destroy_async_on_interface(ps, ifnum);
707}
708
709/* We don't care about suspend/resume of claimed interfaces */
710static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
711{
712 return 0;
713}
714
715static int driver_resume(struct usb_interface *intf)
716{
717 return 0;
718}
719
720/* The following routines apply to the entire device, not interfaces */
721void usbfs_notify_suspend(struct usb_device *udev)
722{
723 /* We don't need to handle this */
724}
725
726void usbfs_notify_resume(struct usb_device *udev)
727{
728 struct usb_dev_state *ps;
729
730 /* Protect against simultaneous remove or release */
731 mutex_lock(&usbfs_mutex);
732 list_for_each_entry(ps, &udev->filelist, list) {
733 WRITE_ONCE(ps->not_yet_resumed, 0);
734 wake_up_all(&ps->wait_for_resume);
735 }
736 mutex_unlock(&usbfs_mutex);
737}
738
739struct usb_driver usbfs_driver = {
740 .name = "usbfs",
741 .probe = driver_probe,
742 .disconnect = driver_disconnect,
743 .suspend = driver_suspend,
744 .resume = driver_resume,
745 .supports_autosuspend = 1,
746};
747
748static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
749{
750 struct usb_device *dev = ps->dev;
751 struct usb_interface *intf;
752 int err;
753
754 if (ifnum >= 8*sizeof(ps->ifclaimed))
755 return -EINVAL;
756 /* already claimed */
757 if (test_bit(ifnum, &ps->ifclaimed))
758 return 0;
759
760 if (ps->privileges_dropped &&
761 !test_bit(ifnum, &ps->interface_allowed_mask))
762 return -EACCES;
763
764 intf = usb_ifnum_to_if(dev, ifnum);
765 if (!intf)
766 err = -ENOENT;
767 else
768 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
769 if (err == 0)
770 set_bit(ifnum, &ps->ifclaimed);
771 return err;
772}
773
774static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
775{
776 struct usb_device *dev;
777 struct usb_interface *intf;
778 int err;
779
780 err = -EINVAL;
781 if (ifnum >= 8*sizeof(ps->ifclaimed))
782 return err;
783 dev = ps->dev;
784 intf = usb_ifnum_to_if(dev, ifnum);
785 if (!intf)
786 err = -ENOENT;
787 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
788 usb_driver_release_interface(&usbfs_driver, intf);
789 err = 0;
790 }
791 return err;
792}
793
794static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
795{
796 if (ps->dev->state != USB_STATE_CONFIGURED)
797 return -EHOSTUNREACH;
798 if (ifnum >= 8*sizeof(ps->ifclaimed))
799 return -EINVAL;
800 if (test_bit(ifnum, &ps->ifclaimed))
801 return 0;
802 /* if not yet claimed, claim it for the driver */
803 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
804 "interface %u before use\n", task_pid_nr(current),
805 current->comm, ifnum);
806 return claimintf(ps, ifnum);
807}
808
809static int findintfep(struct usb_device *dev, unsigned int ep)
810{
811 unsigned int i, j, e;
812 struct usb_interface *intf;
813 struct usb_host_interface *alts;
814 struct usb_endpoint_descriptor *endpt;
815
816 if (ep & ~(USB_DIR_IN|0xf))
817 return -EINVAL;
818 if (!dev->actconfig)
819 return -ESRCH;
820 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
821 intf = dev->actconfig->interface[i];
822 for (j = 0; j < intf->num_altsetting; j++) {
823 alts = &intf->altsetting[j];
824 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
825 endpt = &alts->endpoint[e].desc;
826 if (endpt->bEndpointAddress == ep)
827 return alts->desc.bInterfaceNumber;
828 }
829 }
830 }
831 return -ENOENT;
832}
833
834static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
835 unsigned int request, unsigned int index)
836{
837 int ret = 0;
838 struct usb_host_interface *alt_setting;
839
840 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
841 && ps->dev->state != USB_STATE_ADDRESS
842 && ps->dev->state != USB_STATE_CONFIGURED)
843 return -EHOSTUNREACH;
844 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
845 return 0;
846
847 /*
848 * check for the special corner case 'get_device_id' in the printer
849 * class specification, which we always want to allow as it is used
850 * to query things like ink level, etc.
851 */
852 if (requesttype == 0xa1 && request == 0) {
853 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
854 index >> 8, index & 0xff);
855 if (alt_setting
856 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
857 return 0;
858 }
859
860 index &= 0xff;
861 switch (requesttype & USB_RECIP_MASK) {
862 case USB_RECIP_ENDPOINT:
863 if ((index & ~USB_DIR_IN) == 0)
864 return 0;
865 ret = findintfep(ps->dev, index);
866 if (ret < 0) {
867 /*
868 * Some not fully compliant Win apps seem to get
869 * index wrong and have the endpoint number here
870 * rather than the endpoint address (with the
871 * correct direction). Win does let this through,
872 * so we'll not reject it here but leave it to
873 * the device to not break KVM. But we warn.
874 */
875 ret = findintfep(ps->dev, index ^ 0x80);
876 if (ret >= 0)
877 dev_info(&ps->dev->dev,
878 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
879 __func__, task_pid_nr(current),
880 current->comm, index, index ^ 0x80);
881 }
882 if (ret >= 0)
883 ret = checkintf(ps, ret);
884 break;
885
886 case USB_RECIP_INTERFACE:
887 ret = checkintf(ps, index);
888 break;
889 }
890 return ret;
891}
892
893static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
894 unsigned char ep)
895{
896 if (ep & USB_ENDPOINT_DIR_MASK)
897 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
898 else
899 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
900}
901
902static int parse_usbdevfs_streams(struct usb_dev_state *ps,
903 struct usbdevfs_streams __user *streams,
904 unsigned int *num_streams_ret,
905 unsigned int *num_eps_ret,
906 struct usb_host_endpoint ***eps_ret,
907 struct usb_interface **intf_ret)
908{
909 unsigned int i, num_streams, num_eps;
910 struct usb_host_endpoint **eps;
911 struct usb_interface *intf = NULL;
912 unsigned char ep;
913 int ifnum, ret;
914
915 if (get_user(num_streams, &streams->num_streams) ||
916 get_user(num_eps, &streams->num_eps))
917 return -EFAULT;
918
919 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
920 return -EINVAL;
921
922 /* The XHCI controller allows max 2 ^ 16 streams */
923 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
924 return -EINVAL;
925
926 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
927 if (!eps)
928 return -ENOMEM;
929
930 for (i = 0; i < num_eps; i++) {
931 if (get_user(ep, &streams->eps[i])) {
932 ret = -EFAULT;
933 goto error;
934 }
935 eps[i] = ep_to_host_endpoint(ps->dev, ep);
936 if (!eps[i]) {
937 ret = -EINVAL;
938 goto error;
939 }
940
941 /* usb_alloc/free_streams operate on an usb_interface */
942 ifnum = findintfep(ps->dev, ep);
943 if (ifnum < 0) {
944 ret = ifnum;
945 goto error;
946 }
947
948 if (i == 0) {
949 ret = checkintf(ps, ifnum);
950 if (ret < 0)
951 goto error;
952 intf = usb_ifnum_to_if(ps->dev, ifnum);
953 } else {
954 /* Verify all eps belong to the same interface */
955 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
956 ret = -EINVAL;
957 goto error;
958 }
959 }
960 }
961
962 if (num_streams_ret)
963 *num_streams_ret = num_streams;
964 *num_eps_ret = num_eps;
965 *eps_ret = eps;
966 *intf_ret = intf;
967
968 return 0;
969
970error:
971 kfree(eps);
972 return ret;
973}
974
975static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
976{
977 struct device *dev;
978
979 dev = bus_find_device_by_devt(&usb_bus_type, devt);
980 if (!dev)
981 return NULL;
982 return to_usb_device(dev);
983}
984
985/*
986 * file operations
987 */
988static int usbdev_open(struct inode *inode, struct file *file)
989{
990 struct usb_device *dev = NULL;
991 struct usb_dev_state *ps;
992 int ret;
993
994 ret = -ENOMEM;
995 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
996 if (!ps)
997 goto out_free_ps;
998
999 ret = -ENODEV;
1000
1001 /* usbdev device-node */
1002 if (imajor(inode) == USB_DEVICE_MAJOR)
1003 dev = usbdev_lookup_by_devt(inode->i_rdev);
1004 if (!dev)
1005 goto out_free_ps;
1006
1007 usb_lock_device(dev);
1008 if (dev->state == USB_STATE_NOTATTACHED)
1009 goto out_unlock_device;
1010
1011 ret = usb_autoresume_device(dev);
1012 if (ret)
1013 goto out_unlock_device;
1014
1015 ps->dev = dev;
1016 ps->file = file;
1017 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018 spin_lock_init(&ps->lock);
1019 INIT_LIST_HEAD(&ps->list);
1020 INIT_LIST_HEAD(&ps->async_pending);
1021 INIT_LIST_HEAD(&ps->async_completed);
1022 INIT_LIST_HEAD(&ps->memory_list);
1023 init_waitqueue_head(&ps->wait);
1024 init_waitqueue_head(&ps->wait_for_resume);
1025 ps->disc_pid = get_pid(task_pid(current));
1026 ps->cred = get_current_cred();
1027 smp_wmb();
1028
1029 /* Can't race with resume; the device is already active */
1030 list_add_tail(&ps->list, &dev->filelist);
1031 file->private_data = ps;
1032 usb_unlock_device(dev);
1033 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1034 current->comm);
1035 return ret;
1036
1037 out_unlock_device:
1038 usb_unlock_device(dev);
1039 usb_put_dev(dev);
1040 out_free_ps:
1041 kfree(ps);
1042 return ret;
1043}
1044
1045static int usbdev_release(struct inode *inode, struct file *file)
1046{
1047 struct usb_dev_state *ps = file->private_data;
1048 struct usb_device *dev = ps->dev;
1049 unsigned int ifnum;
1050 struct async *as;
1051
1052 usb_lock_device(dev);
1053 usb_hub_release_all_ports(dev, ps);
1054
1055 /* Protect against simultaneous resume */
1056 mutex_lock(&usbfs_mutex);
1057 list_del_init(&ps->list);
1058 mutex_unlock(&usbfs_mutex);
1059
1060 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1061 ifnum++) {
1062 if (test_bit(ifnum, &ps->ifclaimed))
1063 releaseintf(ps, ifnum);
1064 }
1065 destroy_all_async(ps);
1066 if (!ps->suspend_allowed)
1067 usb_autosuspend_device(dev);
1068 usb_unlock_device(dev);
1069 usb_put_dev(dev);
1070 put_pid(ps->disc_pid);
1071 put_cred(ps->cred);
1072
1073 as = async_getcompleted(ps);
1074 while (as) {
1075 free_async(as);
1076 as = async_getcompleted(ps);
1077 }
1078
1079 kfree(ps);
1080 return 0;
1081}
1082
1083static int proc_control(struct usb_dev_state *ps, void __user *arg)
1084{
1085 struct usb_device *dev = ps->dev;
1086 struct usbdevfs_ctrltransfer ctrl;
1087 unsigned int tmo;
1088 unsigned char *tbuf;
1089 unsigned wLength;
1090 int i, pipe, ret;
1091
1092 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1093 return -EFAULT;
1094 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1095 ctrl.wIndex);
1096 if (ret)
1097 return ret;
1098 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1099 if (wLength > PAGE_SIZE)
1100 return -EINVAL;
1101 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1102 sizeof(struct usb_ctrlrequest));
1103 if (ret)
1104 return ret;
1105 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1106 if (!tbuf) {
1107 ret = -ENOMEM;
1108 goto done;
1109 }
1110 tmo = ctrl.timeout;
1111 snoop(&dev->dev, "control urb: bRequestType=%02x "
1112 "bRequest=%02x wValue=%04x "
1113 "wIndex=%04x wLength=%04x\n",
1114 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1115 ctrl.wIndex, ctrl.wLength);
1116 if (ctrl.bRequestType & 0x80) {
1117 if (ctrl.wLength && !access_ok(ctrl.data,
1118 ctrl.wLength)) {
1119 ret = -EINVAL;
1120 goto done;
1121 }
1122 pipe = usb_rcvctrlpipe(dev, 0);
1123 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1124
1125 usb_unlock_device(dev);
1126 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1127 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1128 tbuf, ctrl.wLength, tmo);
1129 usb_lock_device(dev);
1130 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1131 tbuf, max(i, 0));
1132 if ((i > 0) && ctrl.wLength) {
1133 if (copy_to_user(ctrl.data, tbuf, i)) {
1134 ret = -EFAULT;
1135 goto done;
1136 }
1137 }
1138 } else {
1139 if (ctrl.wLength) {
1140 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1141 ret = -EFAULT;
1142 goto done;
1143 }
1144 }
1145 pipe = usb_sndctrlpipe(dev, 0);
1146 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1147 tbuf, ctrl.wLength);
1148
1149 usb_unlock_device(dev);
1150 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1151 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1152 tbuf, ctrl.wLength, tmo);
1153 usb_lock_device(dev);
1154 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1155 }
1156 if (i < 0 && i != -EPIPE) {
1157 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1158 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1159 current->comm, ctrl.bRequestType, ctrl.bRequest,
1160 ctrl.wLength, i);
1161 }
1162 ret = i;
1163 done:
1164 free_page((unsigned long) tbuf);
1165 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1166 sizeof(struct usb_ctrlrequest));
1167 return ret;
1168}
1169
1170static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1171{
1172 struct usb_device *dev = ps->dev;
1173 struct usbdevfs_bulktransfer bulk;
1174 unsigned int tmo, len1, pipe;
1175 int len2;
1176 unsigned char *tbuf;
1177 int i, ret;
1178
1179 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1180 return -EFAULT;
1181 ret = findintfep(ps->dev, bulk.ep);
1182 if (ret < 0)
1183 return ret;
1184 ret = checkintf(ps, ret);
1185 if (ret)
1186 return ret;
1187 if (bulk.ep & USB_DIR_IN)
1188 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1189 else
1190 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1191 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1192 return -EINVAL;
1193 len1 = bulk.len;
1194 if (len1 >= (INT_MAX - sizeof(struct urb)))
1195 return -EINVAL;
1196 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1197 if (ret)
1198 return ret;
1199 tbuf = kmalloc(len1, GFP_KERNEL);
1200 if (!tbuf) {
1201 ret = -ENOMEM;
1202 goto done;
1203 }
1204 tmo = bulk.timeout;
1205 if (bulk.ep & 0x80) {
1206 if (len1 && !access_ok(bulk.data, len1)) {
1207 ret = -EINVAL;
1208 goto done;
1209 }
1210 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1211
1212 usb_unlock_device(dev);
1213 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214 usb_lock_device(dev);
1215 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1216
1217 if (!i && len2) {
1218 if (copy_to_user(bulk.data, tbuf, len2)) {
1219 ret = -EFAULT;
1220 goto done;
1221 }
1222 }
1223 } else {
1224 if (len1) {
1225 if (copy_from_user(tbuf, bulk.data, len1)) {
1226 ret = -EFAULT;
1227 goto done;
1228 }
1229 }
1230 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1231
1232 usb_unlock_device(dev);
1233 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1234 usb_lock_device(dev);
1235 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1236 }
1237 ret = (i < 0 ? i : len2);
1238 done:
1239 kfree(tbuf);
1240 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1241 return ret;
1242}
1243
1244static void check_reset_of_active_ep(struct usb_device *udev,
1245 unsigned int epnum, char *ioctl_name)
1246{
1247 struct usb_host_endpoint **eps;
1248 struct usb_host_endpoint *ep;
1249
1250 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1251 ep = eps[epnum & 0x0f];
1252 if (ep && !list_empty(&ep->urb_list))
1253 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1254 task_pid_nr(current), current->comm,
1255 ioctl_name, epnum);
1256}
1257
1258static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1259{
1260 unsigned int ep;
1261 int ret;
1262
1263 if (get_user(ep, (unsigned int __user *)arg))
1264 return -EFAULT;
1265 ret = findintfep(ps->dev, ep);
1266 if (ret < 0)
1267 return ret;
1268 ret = checkintf(ps, ret);
1269 if (ret)
1270 return ret;
1271 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1272 usb_reset_endpoint(ps->dev, ep);
1273 return 0;
1274}
1275
1276static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1277{
1278 unsigned int ep;
1279 int pipe;
1280 int ret;
1281
1282 if (get_user(ep, (unsigned int __user *)arg))
1283 return -EFAULT;
1284 ret = findintfep(ps->dev, ep);
1285 if (ret < 0)
1286 return ret;
1287 ret = checkintf(ps, ret);
1288 if (ret)
1289 return ret;
1290 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1291 if (ep & USB_DIR_IN)
1292 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1293 else
1294 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1295
1296 return usb_clear_halt(ps->dev, pipe);
1297}
1298
1299static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1300{
1301 struct usbdevfs_getdriver gd;
1302 struct usb_interface *intf;
1303 int ret;
1304
1305 if (copy_from_user(&gd, arg, sizeof(gd)))
1306 return -EFAULT;
1307 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1308 if (!intf || !intf->dev.driver)
1309 ret = -ENODATA;
1310 else {
1311 strlcpy(gd.driver, intf->dev.driver->name,
1312 sizeof(gd.driver));
1313 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1314 }
1315 return ret;
1316}
1317
1318static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1319{
1320 struct usbdevfs_connectinfo ci;
1321
1322 memset(&ci, 0, sizeof(ci));
1323 ci.devnum = ps->dev->devnum;
1324 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1325
1326 if (copy_to_user(arg, &ci, sizeof(ci)))
1327 return -EFAULT;
1328 return 0;
1329}
1330
1331static int proc_conninfo_ex(struct usb_dev_state *ps,
1332 void __user *arg, size_t size)
1333{
1334 struct usbdevfs_conninfo_ex ci;
1335 struct usb_device *udev = ps->dev;
1336
1337 if (size < sizeof(ci.size))
1338 return -EINVAL;
1339
1340 memset(&ci, 0, sizeof(ci));
1341 ci.size = sizeof(ci);
1342 ci.busnum = udev->bus->busnum;
1343 ci.devnum = udev->devnum;
1344 ci.speed = udev->speed;
1345
1346 while (udev && udev->portnum != 0) {
1347 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1348 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1349 udev->portnum;
1350 udev = udev->parent;
1351 }
1352
1353 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1354 memmove(&ci.ports[0],
1355 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1356 ci.num_ports);
1357
1358 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1359 return -EFAULT;
1360
1361 return 0;
1362}
1363
1364static int proc_resetdevice(struct usb_dev_state *ps)
1365{
1366 struct usb_host_config *actconfig = ps->dev->actconfig;
1367 struct usb_interface *interface;
1368 int i, number;
1369
1370 /* Don't allow a device reset if the process has dropped the
1371 * privilege to do such things and any of the interfaces are
1372 * currently claimed.
1373 */
1374 if (ps->privileges_dropped && actconfig) {
1375 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1376 interface = actconfig->interface[i];
1377 number = interface->cur_altsetting->desc.bInterfaceNumber;
1378 if (usb_interface_claimed(interface) &&
1379 !test_bit(number, &ps->ifclaimed)) {
1380 dev_warn(&ps->dev->dev,
1381 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1382 number, interface->dev.driver->name, current->comm);
1383 return -EACCES;
1384 }
1385 }
1386 }
1387
1388 return usb_reset_device(ps->dev);
1389}
1390
1391static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1392{
1393 struct usbdevfs_setinterface setintf;
1394 int ret;
1395
1396 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1397 return -EFAULT;
1398 ret = checkintf(ps, setintf.interface);
1399 if (ret)
1400 return ret;
1401
1402 destroy_async_on_interface(ps, setintf.interface);
1403
1404 return usb_set_interface(ps->dev, setintf.interface,
1405 setintf.altsetting);
1406}
1407
1408static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1409{
1410 int u;
1411 int status = 0;
1412 struct usb_host_config *actconfig;
1413
1414 if (get_user(u, (int __user *)arg))
1415 return -EFAULT;
1416
1417 actconfig = ps->dev->actconfig;
1418
1419 /* Don't touch the device if any interfaces are claimed.
1420 * It could interfere with other drivers' operations, and if
1421 * an interface is claimed by usbfs it could easily deadlock.
1422 */
1423 if (actconfig) {
1424 int i;
1425
1426 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1427 if (usb_interface_claimed(actconfig->interface[i])) {
1428 dev_warn(&ps->dev->dev,
1429 "usbfs: interface %d claimed by %s "
1430 "while '%s' sets config #%d\n",
1431 actconfig->interface[i]
1432 ->cur_altsetting
1433 ->desc.bInterfaceNumber,
1434 actconfig->interface[i]
1435 ->dev.driver->name,
1436 current->comm, u);
1437 status = -EBUSY;
1438 break;
1439 }
1440 }
1441 }
1442
1443 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1444 * so avoid usb_set_configuration()'s kick to sysfs
1445 */
1446 if (status == 0) {
1447 if (actconfig && actconfig->desc.bConfigurationValue == u)
1448 status = usb_reset_configuration(ps->dev);
1449 else
1450 status = usb_set_configuration(ps->dev, u);
1451 }
1452
1453 return status;
1454}
1455
1456static struct usb_memory *
1457find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1458{
1459 struct usb_memory *usbm = NULL, *iter;
1460 unsigned long flags;
1461 unsigned long uurb_start = (unsigned long)uurb->buffer;
1462
1463 spin_lock_irqsave(&ps->lock, flags);
1464 list_for_each_entry(iter, &ps->memory_list, memlist) {
1465 if (uurb_start >= iter->vm_start &&
1466 uurb_start < iter->vm_start + iter->size) {
1467 if (uurb->buffer_length > iter->vm_start + iter->size -
1468 uurb_start) {
1469 usbm = ERR_PTR(-EINVAL);
1470 } else {
1471 usbm = iter;
1472 usbm->urb_use_count++;
1473 }
1474 break;
1475 }
1476 }
1477 spin_unlock_irqrestore(&ps->lock, flags);
1478 return usbm;
1479}
1480
1481static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1482 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1483 void __user *arg, sigval_t userurb_sigval)
1484{
1485 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1486 struct usb_host_endpoint *ep;
1487 struct async *as = NULL;
1488 struct usb_ctrlrequest *dr = NULL;
1489 unsigned int u, totlen, isofrmlen;
1490 int i, ret, num_sgs = 0, ifnum = -1;
1491 int number_of_packets = 0;
1492 unsigned int stream_id = 0;
1493 void *buf;
1494 bool is_in;
1495 bool allow_short = false;
1496 bool allow_zero = false;
1497 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1498 USBDEVFS_URB_BULK_CONTINUATION |
1499 USBDEVFS_URB_NO_FSBR |
1500 USBDEVFS_URB_ZERO_PACKET |
1501 USBDEVFS_URB_NO_INTERRUPT;
1502 /* USBDEVFS_URB_ISO_ASAP is a special case */
1503 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1504 mask |= USBDEVFS_URB_ISO_ASAP;
1505
1506 if (uurb->flags & ~mask)
1507 return -EINVAL;
1508
1509 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1510 return -EINVAL;
1511 if (uurb->buffer_length > 0 && !uurb->buffer)
1512 return -EINVAL;
1513 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1514 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1515 ifnum = findintfep(ps->dev, uurb->endpoint);
1516 if (ifnum < 0)
1517 return ifnum;
1518 ret = checkintf(ps, ifnum);
1519 if (ret)
1520 return ret;
1521 }
1522 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1523 if (!ep)
1524 return -ENOENT;
1525 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1526
1527 u = 0;
1528 switch (uurb->type) {
1529 case USBDEVFS_URB_TYPE_CONTROL:
1530 if (!usb_endpoint_xfer_control(&ep->desc))
1531 return -EINVAL;
1532 /* min 8 byte setup packet */
1533 if (uurb->buffer_length < 8)
1534 return -EINVAL;
1535 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1536 if (!dr)
1537 return -ENOMEM;
1538 if (copy_from_user(dr, uurb->buffer, 8)) {
1539 ret = -EFAULT;
1540 goto error;
1541 }
1542 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1543 ret = -EINVAL;
1544 goto error;
1545 }
1546 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1547 le16_to_cpu(dr->wIndex));
1548 if (ret)
1549 goto error;
1550 uurb->buffer_length = le16_to_cpu(dr->wLength);
1551 uurb->buffer += 8;
1552 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1553 is_in = 1;
1554 uurb->endpoint |= USB_DIR_IN;
1555 } else {
1556 is_in = 0;
1557 uurb->endpoint &= ~USB_DIR_IN;
1558 }
1559 if (is_in)
1560 allow_short = true;
1561 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1562 "bRequest=%02x wValue=%04x "
1563 "wIndex=%04x wLength=%04x\n",
1564 dr->bRequestType, dr->bRequest,
1565 __le16_to_cpu(dr->wValue),
1566 __le16_to_cpu(dr->wIndex),
1567 __le16_to_cpu(dr->wLength));
1568 u = sizeof(struct usb_ctrlrequest);
1569 break;
1570
1571 case USBDEVFS_URB_TYPE_BULK:
1572 if (!is_in)
1573 allow_zero = true;
1574 else
1575 allow_short = true;
1576 switch (usb_endpoint_type(&ep->desc)) {
1577 case USB_ENDPOINT_XFER_CONTROL:
1578 case USB_ENDPOINT_XFER_ISOC:
1579 return -EINVAL;
1580 case USB_ENDPOINT_XFER_INT:
1581 /* allow single-shot interrupt transfers */
1582 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1583 goto interrupt_urb;
1584 }
1585 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1586 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1587 num_sgs = 0;
1588 if (ep->streams)
1589 stream_id = uurb->stream_id;
1590 break;
1591
1592 case USBDEVFS_URB_TYPE_INTERRUPT:
1593 if (!usb_endpoint_xfer_int(&ep->desc))
1594 return -EINVAL;
1595 interrupt_urb:
1596 if (!is_in)
1597 allow_zero = true;
1598 else
1599 allow_short = true;
1600 break;
1601
1602 case USBDEVFS_URB_TYPE_ISO:
1603 /* arbitrary limit */
1604 if (uurb->number_of_packets < 1 ||
1605 uurb->number_of_packets > 128)
1606 return -EINVAL;
1607 if (!usb_endpoint_xfer_isoc(&ep->desc))
1608 return -EINVAL;
1609 number_of_packets = uurb->number_of_packets;
1610 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1611 number_of_packets;
1612 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1613 if (IS_ERR(isopkt)) {
1614 ret = PTR_ERR(isopkt);
1615 isopkt = NULL;
1616 goto error;
1617 }
1618 for (totlen = u = 0; u < number_of_packets; u++) {
1619 /*
1620 * arbitrary limit need for USB 3.1 Gen2
1621 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1622 */
1623 if (isopkt[u].length > 98304) {
1624 ret = -EINVAL;
1625 goto error;
1626 }
1627 totlen += isopkt[u].length;
1628 }
1629 u *= sizeof(struct usb_iso_packet_descriptor);
1630 uurb->buffer_length = totlen;
1631 break;
1632
1633 default:
1634 return -EINVAL;
1635 }
1636
1637 if (uurb->buffer_length > 0 &&
1638 !access_ok(uurb->buffer, uurb->buffer_length)) {
1639 ret = -EFAULT;
1640 goto error;
1641 }
1642 as = alloc_async(number_of_packets);
1643 if (!as) {
1644 ret = -ENOMEM;
1645 goto error;
1646 }
1647
1648 as->usbm = find_memory_area(ps, uurb);
1649 if (IS_ERR(as->usbm)) {
1650 ret = PTR_ERR(as->usbm);
1651 as->usbm = NULL;
1652 goto error;
1653 }
1654
1655 /* do not use SG buffers when memory mapped segments
1656 * are in use
1657 */
1658 if (as->usbm)
1659 num_sgs = 0;
1660
1661 u += sizeof(struct async) + sizeof(struct urb) +
1662 (as->usbm ? 0 : uurb->buffer_length) +
1663 num_sgs * sizeof(struct scatterlist);
1664 ret = usbfs_increase_memory_usage(u);
1665 if (ret)
1666 goto error;
1667 as->mem_usage = u;
1668
1669 if (num_sgs) {
1670 as->urb->sg = kmalloc_array(num_sgs,
1671 sizeof(struct scatterlist),
1672 GFP_KERNEL);
1673 if (!as->urb->sg) {
1674 ret = -ENOMEM;
1675 goto error;
1676 }
1677 as->urb->num_sgs = num_sgs;
1678 sg_init_table(as->urb->sg, as->urb->num_sgs);
1679
1680 totlen = uurb->buffer_length;
1681 for (i = 0; i < as->urb->num_sgs; i++) {
1682 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1683 buf = kmalloc(u, GFP_KERNEL);
1684 if (!buf) {
1685 ret = -ENOMEM;
1686 goto error;
1687 }
1688 sg_set_buf(&as->urb->sg[i], buf, u);
1689
1690 if (!is_in) {
1691 if (copy_from_user(buf, uurb->buffer, u)) {
1692 ret = -EFAULT;
1693 goto error;
1694 }
1695 uurb->buffer += u;
1696 }
1697 totlen -= u;
1698 }
1699 } else if (uurb->buffer_length > 0) {
1700 if (as->usbm) {
1701 unsigned long uurb_start = (unsigned long)uurb->buffer;
1702
1703 as->urb->transfer_buffer = as->usbm->mem +
1704 (uurb_start - as->usbm->vm_start);
1705 } else {
1706 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1707 GFP_KERNEL);
1708 if (!as->urb->transfer_buffer) {
1709 ret = -ENOMEM;
1710 goto error;
1711 }
1712 if (!is_in) {
1713 if (copy_from_user(as->urb->transfer_buffer,
1714 uurb->buffer,
1715 uurb->buffer_length)) {
1716 ret = -EFAULT;
1717 goto error;
1718 }
1719 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1720 /*
1721 * Isochronous input data may end up being
1722 * discontiguous if some of the packets are
1723 * short. Clear the buffer so that the gaps
1724 * don't leak kernel data to userspace.
1725 */
1726 memset(as->urb->transfer_buffer, 0,
1727 uurb->buffer_length);
1728 }
1729 }
1730 }
1731 as->urb->dev = ps->dev;
1732 as->urb->pipe = (uurb->type << 30) |
1733 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1734 (uurb->endpoint & USB_DIR_IN);
1735
1736 /* This tedious sequence is necessary because the URB_* flags
1737 * are internal to the kernel and subject to change, whereas
1738 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1739 */
1740 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1741 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1742 u |= URB_ISO_ASAP;
1743 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1744 u |= URB_SHORT_NOT_OK;
1745 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1746 u |= URB_ZERO_PACKET;
1747 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1748 u |= URB_NO_INTERRUPT;
1749 as->urb->transfer_flags = u;
1750
1751 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1752 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1753 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1754 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1755
1756 as->urb->transfer_buffer_length = uurb->buffer_length;
1757 as->urb->setup_packet = (unsigned char *)dr;
1758 dr = NULL;
1759 as->urb->start_frame = uurb->start_frame;
1760 as->urb->number_of_packets = number_of_packets;
1761 as->urb->stream_id = stream_id;
1762
1763 if (ep->desc.bInterval) {
1764 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1765 ps->dev->speed == USB_SPEED_HIGH ||
1766 ps->dev->speed >= USB_SPEED_SUPER)
1767 as->urb->interval = 1 <<
1768 min(15, ep->desc.bInterval - 1);
1769 else
1770 as->urb->interval = ep->desc.bInterval;
1771 }
1772
1773 as->urb->context = as;
1774 as->urb->complete = async_completed;
1775 for (totlen = u = 0; u < number_of_packets; u++) {
1776 as->urb->iso_frame_desc[u].offset = totlen;
1777 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1778 totlen += isopkt[u].length;
1779 }
1780 kfree(isopkt);
1781 isopkt = NULL;
1782 as->ps = ps;
1783 as->userurb = arg;
1784 as->userurb_sigval = userurb_sigval;
1785 if (as->usbm) {
1786 unsigned long uurb_start = (unsigned long)uurb->buffer;
1787
1788 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1789 as->urb->transfer_dma = as->usbm->dma_handle +
1790 (uurb_start - as->usbm->vm_start);
1791 } else if (is_in && uurb->buffer_length > 0)
1792 as->userbuffer = uurb->buffer;
1793 as->signr = uurb->signr;
1794 as->ifnum = ifnum;
1795 as->pid = get_pid(task_pid(current));
1796 as->cred = get_current_cred();
1797 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1798 as->urb->transfer_buffer_length, 0, SUBMIT,
1799 NULL, 0);
1800 if (!is_in)
1801 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1802
1803 async_newpending(as);
1804
1805 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1806 spin_lock_irq(&ps->lock);
1807
1808 /* Not exactly the endpoint address; the direction bit is
1809 * shifted to the 0x10 position so that the value will be
1810 * between 0 and 31.
1811 */
1812 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1813 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1814 >> 3);
1815
1816 /* If this bulk URB is the start of a new transfer, re-enable
1817 * the endpoint. Otherwise mark it as a continuation URB.
1818 */
1819 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1820 as->bulk_status = AS_CONTINUATION;
1821 else
1822 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1823
1824 /* Don't accept continuation URBs if the endpoint is
1825 * disabled because of an earlier error.
1826 */
1827 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1828 ret = -EREMOTEIO;
1829 else
1830 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1831 spin_unlock_irq(&ps->lock);
1832 } else {
1833 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1834 }
1835
1836 if (ret) {
1837 dev_printk(KERN_DEBUG, &ps->dev->dev,
1838 "usbfs: usb_submit_urb returned %d\n", ret);
1839 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1840 0, ret, COMPLETE, NULL, 0);
1841 async_removepending(as);
1842 goto error;
1843 }
1844 return 0;
1845
1846 error:
1847 kfree(isopkt);
1848 kfree(dr);
1849 if (as)
1850 free_async(as);
1851 return ret;
1852}
1853
1854static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1855{
1856 struct usbdevfs_urb uurb;
1857 sigval_t userurb_sigval;
1858
1859 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1860 return -EFAULT;
1861
1862 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1863 userurb_sigval.sival_ptr = arg;
1864
1865 return proc_do_submiturb(ps, &uurb,
1866 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1867 arg, userurb_sigval);
1868}
1869
1870static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1871{
1872 struct urb *urb;
1873 struct async *as;
1874 unsigned long flags;
1875
1876 spin_lock_irqsave(&ps->lock, flags);
1877 as = async_getpending(ps, arg);
1878 if (!as) {
1879 spin_unlock_irqrestore(&ps->lock, flags);
1880 return -EINVAL;
1881 }
1882
1883 urb = as->urb;
1884 usb_get_urb(urb);
1885 spin_unlock_irqrestore(&ps->lock, flags);
1886
1887 usb_kill_urb(urb);
1888 usb_put_urb(urb);
1889
1890 return 0;
1891}
1892
1893static void compute_isochronous_actual_length(struct urb *urb)
1894{
1895 unsigned int i;
1896
1897 if (urb->number_of_packets > 0) {
1898 urb->actual_length = 0;
1899 for (i = 0; i < urb->number_of_packets; i++)
1900 urb->actual_length +=
1901 urb->iso_frame_desc[i].actual_length;
1902 }
1903}
1904
1905static int processcompl(struct async *as, void __user * __user *arg)
1906{
1907 struct urb *urb = as->urb;
1908 struct usbdevfs_urb __user *userurb = as->userurb;
1909 void __user *addr = as->userurb;
1910 unsigned int i;
1911
1912 compute_isochronous_actual_length(urb);
1913 if (as->userbuffer && urb->actual_length) {
1914 if (copy_urb_data_to_user(as->userbuffer, urb))
1915 goto err_out;
1916 }
1917 if (put_user(as->status, &userurb->status))
1918 goto err_out;
1919 if (put_user(urb->actual_length, &userurb->actual_length))
1920 goto err_out;
1921 if (put_user(urb->error_count, &userurb->error_count))
1922 goto err_out;
1923
1924 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1925 for (i = 0; i < urb->number_of_packets; i++) {
1926 if (put_user(urb->iso_frame_desc[i].actual_length,
1927 &userurb->iso_frame_desc[i].actual_length))
1928 goto err_out;
1929 if (put_user(urb->iso_frame_desc[i].status,
1930 &userurb->iso_frame_desc[i].status))
1931 goto err_out;
1932 }
1933 }
1934
1935 if (put_user(addr, (void __user * __user *)arg))
1936 return -EFAULT;
1937 return 0;
1938
1939err_out:
1940 return -EFAULT;
1941}
1942
1943static struct async *reap_as(struct usb_dev_state *ps)
1944{
1945 DECLARE_WAITQUEUE(wait, current);
1946 struct async *as = NULL;
1947 struct usb_device *dev = ps->dev;
1948
1949 add_wait_queue(&ps->wait, &wait);
1950 for (;;) {
1951 __set_current_state(TASK_INTERRUPTIBLE);
1952 as = async_getcompleted(ps);
1953 if (as || !connected(ps))
1954 break;
1955 if (signal_pending(current))
1956 break;
1957 usb_unlock_device(dev);
1958 schedule();
1959 usb_lock_device(dev);
1960 }
1961 remove_wait_queue(&ps->wait, &wait);
1962 set_current_state(TASK_RUNNING);
1963 return as;
1964}
1965
1966static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1967{
1968 struct async *as = reap_as(ps);
1969
1970 if (as) {
1971 int retval;
1972
1973 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1974 retval = processcompl(as, (void __user * __user *)arg);
1975 free_async(as);
1976 return retval;
1977 }
1978 if (signal_pending(current))
1979 return -EINTR;
1980 return -ENODEV;
1981}
1982
1983static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1984{
1985 int retval;
1986 struct async *as;
1987
1988 as = async_getcompleted(ps);
1989 if (as) {
1990 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1991 retval = processcompl(as, (void __user * __user *)arg);
1992 free_async(as);
1993 } else {
1994 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1995 }
1996 return retval;
1997}
1998
1999#ifdef CONFIG_COMPAT
2000static int proc_control_compat(struct usb_dev_state *ps,
2001 struct usbdevfs_ctrltransfer32 __user *p32)
2002{
2003 struct usbdevfs_ctrltransfer __user *p;
2004 __u32 udata;
2005 p = compat_alloc_user_space(sizeof(*p));
2006 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
2007 get_user(udata, &p32->data) ||
2008 put_user(compat_ptr(udata), &p->data))
2009 return -EFAULT;
2010 return proc_control(ps, p);
2011}
2012
2013static int proc_bulk_compat(struct usb_dev_state *ps,
2014 struct usbdevfs_bulktransfer32 __user *p32)
2015{
2016 struct usbdevfs_bulktransfer __user *p;
2017 compat_uint_t n;
2018 compat_caddr_t addr;
2019
2020 p = compat_alloc_user_space(sizeof(*p));
2021
2022 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
2023 get_user(n, &p32->len) || put_user(n, &p->len) ||
2024 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2025 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2026 return -EFAULT;
2027
2028 return proc_bulk(ps, p);
2029}
2030static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2031{
2032 struct usbdevfs_disconnectsignal32 ds;
2033
2034 if (copy_from_user(&ds, arg, sizeof(ds)))
2035 return -EFAULT;
2036 ps->discsignr = ds.signr;
2037 ps->disccontext.sival_int = ds.context;
2038 return 0;
2039}
2040
2041static int get_urb32(struct usbdevfs_urb *kurb,
2042 struct usbdevfs_urb32 __user *uurb)
2043{
2044 struct usbdevfs_urb32 urb32;
2045 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2046 return -EFAULT;
2047 kurb->type = urb32.type;
2048 kurb->endpoint = urb32.endpoint;
2049 kurb->status = urb32.status;
2050 kurb->flags = urb32.flags;
2051 kurb->buffer = compat_ptr(urb32.buffer);
2052 kurb->buffer_length = urb32.buffer_length;
2053 kurb->actual_length = urb32.actual_length;
2054 kurb->start_frame = urb32.start_frame;
2055 kurb->number_of_packets = urb32.number_of_packets;
2056 kurb->error_count = urb32.error_count;
2057 kurb->signr = urb32.signr;
2058 kurb->usercontext = compat_ptr(urb32.usercontext);
2059 return 0;
2060}
2061
2062static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2063{
2064 struct usbdevfs_urb uurb;
2065 sigval_t userurb_sigval;
2066
2067 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2068 return -EFAULT;
2069
2070 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2071 userurb_sigval.sival_int = ptr_to_compat(arg);
2072
2073 return proc_do_submiturb(ps, &uurb,
2074 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2075 arg, userurb_sigval);
2076}
2077
2078static int processcompl_compat(struct async *as, void __user * __user *arg)
2079{
2080 struct urb *urb = as->urb;
2081 struct usbdevfs_urb32 __user *userurb = as->userurb;
2082 void __user *addr = as->userurb;
2083 unsigned int i;
2084
2085 compute_isochronous_actual_length(urb);
2086 if (as->userbuffer && urb->actual_length) {
2087 if (copy_urb_data_to_user(as->userbuffer, urb))
2088 return -EFAULT;
2089 }
2090 if (put_user(as->status, &userurb->status))
2091 return -EFAULT;
2092 if (put_user(urb->actual_length, &userurb->actual_length))
2093 return -EFAULT;
2094 if (put_user(urb->error_count, &userurb->error_count))
2095 return -EFAULT;
2096
2097 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2098 for (i = 0; i < urb->number_of_packets; i++) {
2099 if (put_user(urb->iso_frame_desc[i].actual_length,
2100 &userurb->iso_frame_desc[i].actual_length))
2101 return -EFAULT;
2102 if (put_user(urb->iso_frame_desc[i].status,
2103 &userurb->iso_frame_desc[i].status))
2104 return -EFAULT;
2105 }
2106 }
2107
2108 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2109 return -EFAULT;
2110 return 0;
2111}
2112
2113static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2114{
2115 struct async *as = reap_as(ps);
2116
2117 if (as) {
2118 int retval;
2119
2120 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2121 retval = processcompl_compat(as, (void __user * __user *)arg);
2122 free_async(as);
2123 return retval;
2124 }
2125 if (signal_pending(current))
2126 return -EINTR;
2127 return -ENODEV;
2128}
2129
2130static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2131{
2132 int retval;
2133 struct async *as;
2134
2135 as = async_getcompleted(ps);
2136 if (as) {
2137 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2138 retval = processcompl_compat(as, (void __user * __user *)arg);
2139 free_async(as);
2140 } else {
2141 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2142 }
2143 return retval;
2144}
2145
2146
2147#endif
2148
2149static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2150{
2151 struct usbdevfs_disconnectsignal ds;
2152
2153 if (copy_from_user(&ds, arg, sizeof(ds)))
2154 return -EFAULT;
2155 ps->discsignr = ds.signr;
2156 ps->disccontext.sival_ptr = ds.context;
2157 return 0;
2158}
2159
2160static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2161{
2162 unsigned int ifnum;
2163
2164 if (get_user(ifnum, (unsigned int __user *)arg))
2165 return -EFAULT;
2166 return claimintf(ps, ifnum);
2167}
2168
2169static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2170{
2171 unsigned int ifnum;
2172 int ret;
2173
2174 if (get_user(ifnum, (unsigned int __user *)arg))
2175 return -EFAULT;
2176 ret = releaseintf(ps, ifnum);
2177 if (ret < 0)
2178 return ret;
2179 destroy_async_on_interface(ps, ifnum);
2180 return 0;
2181}
2182
2183static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2184{
2185 int size;
2186 void *buf = NULL;
2187 int retval = 0;
2188 struct usb_interface *intf = NULL;
2189 struct usb_driver *driver = NULL;
2190
2191 if (ps->privileges_dropped)
2192 return -EACCES;
2193
2194 if (!connected(ps))
2195 return -ENODEV;
2196
2197 /* alloc buffer */
2198 size = _IOC_SIZE(ctl->ioctl_code);
2199 if (size > 0) {
2200 buf = kmalloc(size, GFP_KERNEL);
2201 if (buf == NULL)
2202 return -ENOMEM;
2203 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2204 if (copy_from_user(buf, ctl->data, size)) {
2205 kfree(buf);
2206 return -EFAULT;
2207 }
2208 } else {
2209 memset(buf, 0, size);
2210 }
2211 }
2212
2213 if (ps->dev->state != USB_STATE_CONFIGURED)
2214 retval = -EHOSTUNREACH;
2215 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2216 retval = -EINVAL;
2217 else switch (ctl->ioctl_code) {
2218
2219 /* disconnect kernel driver from interface */
2220 case USBDEVFS_DISCONNECT:
2221 if (intf->dev.driver) {
2222 driver = to_usb_driver(intf->dev.driver);
2223 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2224 usb_driver_release_interface(driver, intf);
2225 } else
2226 retval = -ENODATA;
2227 break;
2228
2229 /* let kernel drivers try to (re)bind to the interface */
2230 case USBDEVFS_CONNECT:
2231 if (!intf->dev.driver)
2232 retval = device_attach(&intf->dev);
2233 else
2234 retval = -EBUSY;
2235 break;
2236
2237 /* talk directly to the interface's driver */
2238 default:
2239 if (intf->dev.driver)
2240 driver = to_usb_driver(intf->dev.driver);
2241 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2242 retval = -ENOTTY;
2243 } else {
2244 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2245 if (retval == -ENOIOCTLCMD)
2246 retval = -ENOTTY;
2247 }
2248 }
2249
2250 /* cleanup and return */
2251 if (retval >= 0
2252 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2253 && size > 0
2254 && copy_to_user(ctl->data, buf, size) != 0)
2255 retval = -EFAULT;
2256
2257 kfree(buf);
2258 return retval;
2259}
2260
2261static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2262{
2263 struct usbdevfs_ioctl ctrl;
2264
2265 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2266 return -EFAULT;
2267 return proc_ioctl(ps, &ctrl);
2268}
2269
2270#ifdef CONFIG_COMPAT
2271static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2272{
2273 struct usbdevfs_ioctl32 ioc32;
2274 struct usbdevfs_ioctl ctrl;
2275
2276 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2277 return -EFAULT;
2278 ctrl.ifno = ioc32.ifno;
2279 ctrl.ioctl_code = ioc32.ioctl_code;
2280 ctrl.data = compat_ptr(ioc32.data);
2281 return proc_ioctl(ps, &ctrl);
2282}
2283#endif
2284
2285static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2286{
2287 unsigned portnum;
2288 int rc;
2289
2290 if (get_user(portnum, (unsigned __user *) arg))
2291 return -EFAULT;
2292 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2293 if (rc == 0)
2294 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2295 portnum, task_pid_nr(current), current->comm);
2296 return rc;
2297}
2298
2299static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2300{
2301 unsigned portnum;
2302
2303 if (get_user(portnum, (unsigned __user *) arg))
2304 return -EFAULT;
2305 return usb_hub_release_port(ps->dev, portnum, ps);
2306}
2307
2308static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2309{
2310 __u32 caps;
2311
2312 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2313 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2314 USBDEVFS_CAP_DROP_PRIVILEGES |
2315 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2316 if (!ps->dev->bus->no_stop_on_short)
2317 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2318 if (ps->dev->bus->sg_tablesize)
2319 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2320
2321 if (put_user(caps, (__u32 __user *)arg))
2322 return -EFAULT;
2323
2324 return 0;
2325}
2326
2327static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2328{
2329 struct usbdevfs_disconnect_claim dc;
2330 struct usb_interface *intf;
2331
2332 if (copy_from_user(&dc, arg, sizeof(dc)))
2333 return -EFAULT;
2334
2335 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2336 if (!intf)
2337 return -EINVAL;
2338
2339 if (intf->dev.driver) {
2340 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2341
2342 if (ps->privileges_dropped)
2343 return -EACCES;
2344
2345 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2346 strncmp(dc.driver, intf->dev.driver->name,
2347 sizeof(dc.driver)) != 0)
2348 return -EBUSY;
2349
2350 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2351 strncmp(dc.driver, intf->dev.driver->name,
2352 sizeof(dc.driver)) == 0)
2353 return -EBUSY;
2354
2355 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2356 usb_driver_release_interface(driver, intf);
2357 }
2358
2359 return claimintf(ps, dc.interface);
2360}
2361
2362static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2363{
2364 unsigned num_streams, num_eps;
2365 struct usb_host_endpoint **eps;
2366 struct usb_interface *intf;
2367 int r;
2368
2369 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2370 &eps, &intf);
2371 if (r)
2372 return r;
2373
2374 destroy_async_on_interface(ps,
2375 intf->altsetting[0].desc.bInterfaceNumber);
2376
2377 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2378 kfree(eps);
2379 return r;
2380}
2381
2382static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2383{
2384 unsigned num_eps;
2385 struct usb_host_endpoint **eps;
2386 struct usb_interface *intf;
2387 int r;
2388
2389 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2390 if (r)
2391 return r;
2392
2393 destroy_async_on_interface(ps,
2394 intf->altsetting[0].desc.bInterfaceNumber);
2395
2396 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2397 kfree(eps);
2398 return r;
2399}
2400
2401static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2402{
2403 u32 data;
2404
2405 if (copy_from_user(&data, arg, sizeof(data)))
2406 return -EFAULT;
2407
2408 /* This is a one way operation. Once privileges are
2409 * dropped, you cannot regain them. You may however reissue
2410 * this ioctl to shrink the allowed interfaces mask.
2411 */
2412 ps->interface_allowed_mask &= data;
2413 ps->privileges_dropped = true;
2414
2415 return 0;
2416}
2417
2418static int proc_forbid_suspend(struct usb_dev_state *ps)
2419{
2420 int ret = 0;
2421
2422 if (ps->suspend_allowed) {
2423 ret = usb_autoresume_device(ps->dev);
2424 if (ret == 0)
2425 ps->suspend_allowed = false;
2426 else if (ret != -ENODEV)
2427 ret = -EIO;
2428 }
2429 return ret;
2430}
2431
2432static int proc_allow_suspend(struct usb_dev_state *ps)
2433{
2434 if (!connected(ps))
2435 return -ENODEV;
2436
2437 WRITE_ONCE(ps->not_yet_resumed, 1);
2438 if (!ps->suspend_allowed) {
2439 usb_autosuspend_device(ps->dev);
2440 ps->suspend_allowed = true;
2441 }
2442 return 0;
2443}
2444
2445static int proc_wait_for_resume(struct usb_dev_state *ps)
2446{
2447 int ret;
2448
2449 usb_unlock_device(ps->dev);
2450 ret = wait_event_interruptible(ps->wait_for_resume,
2451 READ_ONCE(ps->not_yet_resumed) == 0);
2452 usb_lock_device(ps->dev);
2453
2454 if (ret != 0)
2455 return -EINTR;
2456 return proc_forbid_suspend(ps);
2457}
2458
2459/*
2460 * NOTE: All requests here that have interface numbers as parameters
2461 * are assuming that somehow the configuration has been prevented from
2462 * changing. But there's no mechanism to ensure that...
2463 */
2464static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2465 void __user *p)
2466{
2467 struct usb_dev_state *ps = file->private_data;
2468 struct inode *inode = file_inode(file);
2469 struct usb_device *dev = ps->dev;
2470 int ret = -ENOTTY;
2471
2472 if (!(file->f_mode & FMODE_WRITE))
2473 return -EPERM;
2474
2475 usb_lock_device(dev);
2476
2477 /* Reap operations are allowed even after disconnection */
2478 switch (cmd) {
2479 case USBDEVFS_REAPURB:
2480 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2481 ret = proc_reapurb(ps, p);
2482 goto done;
2483
2484 case USBDEVFS_REAPURBNDELAY:
2485 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2486 ret = proc_reapurbnonblock(ps, p);
2487 goto done;
2488
2489#ifdef CONFIG_COMPAT
2490 case USBDEVFS_REAPURB32:
2491 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2492 ret = proc_reapurb_compat(ps, p);
2493 goto done;
2494
2495 case USBDEVFS_REAPURBNDELAY32:
2496 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2497 ret = proc_reapurbnonblock_compat(ps, p);
2498 goto done;
2499#endif
2500 }
2501
2502 if (!connected(ps)) {
2503 usb_unlock_device(dev);
2504 return -ENODEV;
2505 }
2506
2507 switch (cmd) {
2508 case USBDEVFS_CONTROL:
2509 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2510 ret = proc_control(ps, p);
2511 if (ret >= 0)
2512 inode->i_mtime = current_time(inode);
2513 break;
2514
2515 case USBDEVFS_BULK:
2516 snoop(&dev->dev, "%s: BULK\n", __func__);
2517 ret = proc_bulk(ps, p);
2518 if (ret >= 0)
2519 inode->i_mtime = current_time(inode);
2520 break;
2521
2522 case USBDEVFS_RESETEP:
2523 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2524 ret = proc_resetep(ps, p);
2525 if (ret >= 0)
2526 inode->i_mtime = current_time(inode);
2527 break;
2528
2529 case USBDEVFS_RESET:
2530 snoop(&dev->dev, "%s: RESET\n", __func__);
2531 ret = proc_resetdevice(ps);
2532 break;
2533
2534 case USBDEVFS_CLEAR_HALT:
2535 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2536 ret = proc_clearhalt(ps, p);
2537 if (ret >= 0)
2538 inode->i_mtime = current_time(inode);
2539 break;
2540
2541 case USBDEVFS_GETDRIVER:
2542 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2543 ret = proc_getdriver(ps, p);
2544 break;
2545
2546 case USBDEVFS_CONNECTINFO:
2547 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2548 ret = proc_connectinfo(ps, p);
2549 break;
2550
2551 case USBDEVFS_SETINTERFACE:
2552 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2553 ret = proc_setintf(ps, p);
2554 break;
2555
2556 case USBDEVFS_SETCONFIGURATION:
2557 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2558 ret = proc_setconfig(ps, p);
2559 break;
2560
2561 case USBDEVFS_SUBMITURB:
2562 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2563 ret = proc_submiturb(ps, p);
2564 if (ret >= 0)
2565 inode->i_mtime = current_time(inode);
2566 break;
2567
2568#ifdef CONFIG_COMPAT
2569 case USBDEVFS_CONTROL32:
2570 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2571 ret = proc_control_compat(ps, p);
2572 if (ret >= 0)
2573 inode->i_mtime = current_time(inode);
2574 break;
2575
2576 case USBDEVFS_BULK32:
2577 snoop(&dev->dev, "%s: BULK32\n", __func__);
2578 ret = proc_bulk_compat(ps, p);
2579 if (ret >= 0)
2580 inode->i_mtime = current_time(inode);
2581 break;
2582
2583 case USBDEVFS_DISCSIGNAL32:
2584 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2585 ret = proc_disconnectsignal_compat(ps, p);
2586 break;
2587
2588 case USBDEVFS_SUBMITURB32:
2589 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2590 ret = proc_submiturb_compat(ps, p);
2591 if (ret >= 0)
2592 inode->i_mtime = current_time(inode);
2593 break;
2594
2595 case USBDEVFS_IOCTL32:
2596 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2597 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2598 break;
2599#endif
2600
2601 case USBDEVFS_DISCARDURB:
2602 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2603 ret = proc_unlinkurb(ps, p);
2604 break;
2605
2606 case USBDEVFS_DISCSIGNAL:
2607 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2608 ret = proc_disconnectsignal(ps, p);
2609 break;
2610
2611 case USBDEVFS_CLAIMINTERFACE:
2612 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2613 ret = proc_claiminterface(ps, p);
2614 break;
2615
2616 case USBDEVFS_RELEASEINTERFACE:
2617 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2618 ret = proc_releaseinterface(ps, p);
2619 break;
2620
2621 case USBDEVFS_IOCTL:
2622 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2623 ret = proc_ioctl_default(ps, p);
2624 break;
2625
2626 case USBDEVFS_CLAIM_PORT:
2627 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2628 ret = proc_claim_port(ps, p);
2629 break;
2630
2631 case USBDEVFS_RELEASE_PORT:
2632 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2633 ret = proc_release_port(ps, p);
2634 break;
2635 case USBDEVFS_GET_CAPABILITIES:
2636 ret = proc_get_capabilities(ps, p);
2637 break;
2638 case USBDEVFS_DISCONNECT_CLAIM:
2639 ret = proc_disconnect_claim(ps, p);
2640 break;
2641 case USBDEVFS_ALLOC_STREAMS:
2642 ret = proc_alloc_streams(ps, p);
2643 break;
2644 case USBDEVFS_FREE_STREAMS:
2645 ret = proc_free_streams(ps, p);
2646 break;
2647 case USBDEVFS_DROP_PRIVILEGES:
2648 ret = proc_drop_privileges(ps, p);
2649 break;
2650 case USBDEVFS_GET_SPEED:
2651 ret = ps->dev->speed;
2652 break;
2653 case USBDEVFS_FORBID_SUSPEND:
2654 ret = proc_forbid_suspend(ps);
2655 break;
2656 case USBDEVFS_ALLOW_SUSPEND:
2657 ret = proc_allow_suspend(ps);
2658 break;
2659 case USBDEVFS_WAIT_FOR_RESUME:
2660 ret = proc_wait_for_resume(ps);
2661 break;
2662 }
2663
2664 /* Handle variable-length commands */
2665 switch (cmd & ~IOCSIZE_MASK) {
2666 case USBDEVFS_CONNINFO_EX(0):
2667 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2668 break;
2669 }
2670
2671 done:
2672 usb_unlock_device(dev);
2673 if (ret >= 0)
2674 inode->i_atime = current_time(inode);
2675 return ret;
2676}
2677
2678static long usbdev_ioctl(struct file *file, unsigned int cmd,
2679 unsigned long arg)
2680{
2681 int ret;
2682
2683 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2684
2685 return ret;
2686}
2687
2688#ifdef CONFIG_COMPAT
2689static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2690 unsigned long arg)
2691{
2692 int ret;
2693
2694 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2695
2696 return ret;
2697}
2698#endif
2699
2700/* No kernel lock - fine */
2701static __poll_t usbdev_poll(struct file *file,
2702 struct poll_table_struct *wait)
2703{
2704 struct usb_dev_state *ps = file->private_data;
2705 __poll_t mask = 0;
2706
2707 poll_wait(file, &ps->wait, wait);
2708 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2709 mask |= EPOLLOUT | EPOLLWRNORM;
2710 if (!connected(ps))
2711 mask |= EPOLLHUP;
2712 if (list_empty(&ps->list))
2713 mask |= EPOLLERR;
2714 return mask;
2715}
2716
2717const struct file_operations usbdev_file_operations = {
2718 .owner = THIS_MODULE,
2719 .llseek = no_seek_end_llseek,
2720 .read = usbdev_read,
2721 .poll = usbdev_poll,
2722 .unlocked_ioctl = usbdev_ioctl,
2723#ifdef CONFIG_COMPAT
2724 .compat_ioctl = usbdev_compat_ioctl,
2725#endif
2726 .mmap = usbdev_mmap,
2727 .open = usbdev_open,
2728 .release = usbdev_release,
2729};
2730
2731static void usbdev_remove(struct usb_device *udev)
2732{
2733 struct usb_dev_state *ps;
2734
2735 /* Protect against simultaneous resume */
2736 mutex_lock(&usbfs_mutex);
2737 while (!list_empty(&udev->filelist)) {
2738 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2739 destroy_all_async(ps);
2740 wake_up_all(&ps->wait);
2741 WRITE_ONCE(ps->not_yet_resumed, 0);
2742 wake_up_all(&ps->wait_for_resume);
2743 list_del_init(&ps->list);
2744 if (ps->discsignr)
2745 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2746 ps->disc_pid, ps->cred);
2747 }
2748 mutex_unlock(&usbfs_mutex);
2749}
2750
2751static int usbdev_notify(struct notifier_block *self,
2752 unsigned long action, void *dev)
2753{
2754 switch (action) {
2755 case USB_DEVICE_ADD:
2756 break;
2757 case USB_DEVICE_REMOVE:
2758 usbdev_remove(dev);
2759 break;
2760 }
2761 return NOTIFY_OK;
2762}
2763
2764static struct notifier_block usbdev_nb = {
2765 .notifier_call = usbdev_notify,
2766};
2767
2768static struct cdev usb_device_cdev;
2769
2770int __init usb_devio_init(void)
2771{
2772 int retval;
2773
2774 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2775 "usb_device");
2776 if (retval) {
2777 printk(KERN_ERR "Unable to register minors for usb_device\n");
2778 goto out;
2779 }
2780 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2781 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2782 if (retval) {
2783 printk(KERN_ERR "Unable to get usb_device major %d\n",
2784 USB_DEVICE_MAJOR);
2785 goto error_cdev;
2786 }
2787 usb_register_notify(&usbdev_nb);
2788out:
2789 return retval;
2790
2791error_cdev:
2792 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2793 goto out;
2794}
2795
2796void usb_devio_cleanup(void)
2797{
2798 usb_unregister_notify(&usbdev_nb);
2799 cdev_del(&usb_device_cdev);
2800 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2801}
1/*****************************************************************************/
2
3/*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35/*****************************************************************************/
36
37#include <linux/fs.h>
38#include <linux/mm.h>
39#include <linux/slab.h>
40#include <linux/signal.h>
41#include <linux/poll.h>
42#include <linux/module.h>
43#include <linux/string.h>
44#include <linux/usb.h>
45#include <linux/usbdevice_fs.h>
46#include <linux/usb/hcd.h> /* for usbcore internals */
47#include <linux/cdev.h>
48#include <linux/notifier.h>
49#include <linux/security.h>
50#include <linux/user_namespace.h>
51#include <linux/scatterlist.h>
52#include <linux/uaccess.h>
53#include <asm/byteorder.h>
54#include <linux/moduleparam.h>
55
56#include "usb.h"
57
58#define USB_MAXBUS 64
59#define USB_DEVICE_MAX (USB_MAXBUS * 128)
60#define USB_SG_SIZE 16384 /* split-size for large txs */
61
62/* Mutual exclusion for removal, open, and release */
63DEFINE_MUTEX(usbfs_mutex);
64
65struct usb_dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
68 struct file *file;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
74 struct pid *disc_pid;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
78 u32 secid;
79 u32 disabled_bulk_eps;
80};
81
82struct async {
83 struct list_head asynclist;
84 struct usb_dev_state *ps;
85 struct pid *pid;
86 const struct cred *cred;
87 unsigned int signr;
88 unsigned int ifnum;
89 void __user *userbuffer;
90 void __user *userurb;
91 struct urb *urb;
92 unsigned int mem_usage;
93 int status;
94 u32 secid;
95 u8 bulk_addr;
96 u8 bulk_status;
97};
98
99static bool usbfs_snoop;
100module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
102
103#define snoop(dev, format, arg...) \
104 do { \
105 if (usbfs_snoop) \
106 dev_info(dev , format , ## arg); \
107 } while (0)
108
109enum snoop_when {
110 SUBMIT, COMPLETE
111};
112
113#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
114
115/* Limit on the total amount of memory we can allocate for transfers */
116static unsigned usbfs_memory_mb = 16;
117module_param(usbfs_memory_mb, uint, 0644);
118MODULE_PARM_DESC(usbfs_memory_mb,
119 "maximum MB allowed for usbfs buffers (0 = no limit)");
120
121/* Hard limit, necessary to avoid arithmetic overflow */
122#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
123
124static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
125
126/* Check whether it's okay to allocate more memory for a transfer */
127static int usbfs_increase_memory_usage(unsigned amount)
128{
129 unsigned lim;
130
131 /*
132 * Convert usbfs_memory_mb to bytes, avoiding overflows.
133 * 0 means use the hard limit (effectively unlimited).
134 */
135 lim = ACCESS_ONCE(usbfs_memory_mb);
136 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
137 lim = USBFS_XFER_MAX;
138 else
139 lim <<= 20;
140
141 atomic_add(amount, &usbfs_memory_usage);
142 if (atomic_read(&usbfs_memory_usage) <= lim)
143 return 0;
144 atomic_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146}
147
148/* Memory for a transfer is being deallocated */
149static void usbfs_decrease_memory_usage(unsigned amount)
150{
151 atomic_sub(amount, &usbfs_memory_usage);
152}
153
154static int connected(struct usb_dev_state *ps)
155{
156 return (!list_empty(&ps->list) &&
157 ps->dev->state != USB_STATE_NOTATTACHED);
158}
159
160static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
161{
162 loff_t ret;
163
164 mutex_lock(&file_inode(file)->i_mutex);
165
166 switch (orig) {
167 case 0:
168 file->f_pos = offset;
169 ret = file->f_pos;
170 break;
171 case 1:
172 file->f_pos += offset;
173 ret = file->f_pos;
174 break;
175 case 2:
176 default:
177 ret = -EINVAL;
178 }
179
180 mutex_unlock(&file_inode(file)->i_mutex);
181 return ret;
182}
183
184static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
185 loff_t *ppos)
186{
187 struct usb_dev_state *ps = file->private_data;
188 struct usb_device *dev = ps->dev;
189 ssize_t ret = 0;
190 unsigned len;
191 loff_t pos;
192 int i;
193
194 pos = *ppos;
195 usb_lock_device(dev);
196 if (!connected(ps)) {
197 ret = -ENODEV;
198 goto err;
199 } else if (pos < 0) {
200 ret = -EINVAL;
201 goto err;
202 }
203
204 if (pos < sizeof(struct usb_device_descriptor)) {
205 /* 18 bytes - fits on the stack */
206 struct usb_device_descriptor temp_desc;
207
208 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
209 le16_to_cpus(&temp_desc.bcdUSB);
210 le16_to_cpus(&temp_desc.idVendor);
211 le16_to_cpus(&temp_desc.idProduct);
212 le16_to_cpus(&temp_desc.bcdDevice);
213
214 len = sizeof(struct usb_device_descriptor) - pos;
215 if (len > nbytes)
216 len = nbytes;
217 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
218 ret = -EFAULT;
219 goto err;
220 }
221
222 *ppos += len;
223 buf += len;
224 nbytes -= len;
225 ret += len;
226 }
227
228 pos = sizeof(struct usb_device_descriptor);
229 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
230 struct usb_config_descriptor *config =
231 (struct usb_config_descriptor *)dev->rawdescriptors[i];
232 unsigned int length = le16_to_cpu(config->wTotalLength);
233
234 if (*ppos < pos + length) {
235
236 /* The descriptor may claim to be longer than it
237 * really is. Here is the actual allocated length. */
238 unsigned alloclen =
239 le16_to_cpu(dev->config[i].desc.wTotalLength);
240
241 len = length - (*ppos - pos);
242 if (len > nbytes)
243 len = nbytes;
244
245 /* Simply don't write (skip over) unallocated parts */
246 if (alloclen > (*ppos - pos)) {
247 alloclen -= (*ppos - pos);
248 if (copy_to_user(buf,
249 dev->rawdescriptors[i] + (*ppos - pos),
250 min(len, alloclen))) {
251 ret = -EFAULT;
252 goto err;
253 }
254 }
255
256 *ppos += len;
257 buf += len;
258 nbytes -= len;
259 ret += len;
260 }
261
262 pos += length;
263 }
264
265err:
266 usb_unlock_device(dev);
267 return ret;
268}
269
270/*
271 * async list handling
272 */
273
274static struct async *alloc_async(unsigned int numisoframes)
275{
276 struct async *as;
277
278 as = kzalloc(sizeof(struct async), GFP_KERNEL);
279 if (!as)
280 return NULL;
281 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
282 if (!as->urb) {
283 kfree(as);
284 return NULL;
285 }
286 return as;
287}
288
289static void free_async(struct async *as)
290{
291 int i;
292
293 put_pid(as->pid);
294 if (as->cred)
295 put_cred(as->cred);
296 for (i = 0; i < as->urb->num_sgs; i++) {
297 if (sg_page(&as->urb->sg[i]))
298 kfree(sg_virt(&as->urb->sg[i]));
299 }
300 kfree(as->urb->sg);
301 kfree(as->urb->transfer_buffer);
302 kfree(as->urb->setup_packet);
303 usb_free_urb(as->urb);
304 usbfs_decrease_memory_usage(as->mem_usage);
305 kfree(as);
306}
307
308static void async_newpending(struct async *as)
309{
310 struct usb_dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_add_tail(&as->asynclist, &ps->async_pending);
315 spin_unlock_irqrestore(&ps->lock, flags);
316}
317
318static void async_removepending(struct async *as)
319{
320 struct usb_dev_state *ps = as->ps;
321 unsigned long flags;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 list_del_init(&as->asynclist);
325 spin_unlock_irqrestore(&ps->lock, flags);
326}
327
328static struct async *async_getcompleted(struct usb_dev_state *ps)
329{
330 unsigned long flags;
331 struct async *as = NULL;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 if (!list_empty(&ps->async_completed)) {
335 as = list_entry(ps->async_completed.next, struct async,
336 asynclist);
337 list_del_init(&as->asynclist);
338 }
339 spin_unlock_irqrestore(&ps->lock, flags);
340 return as;
341}
342
343static struct async *async_getpending(struct usb_dev_state *ps,
344 void __user *userurb)
345{
346 struct async *as;
347
348 list_for_each_entry(as, &ps->async_pending, asynclist)
349 if (as->userurb == userurb) {
350 list_del_init(&as->asynclist);
351 return as;
352 }
353
354 return NULL;
355}
356
357static void snoop_urb(struct usb_device *udev,
358 void __user *userurb, int pipe, unsigned length,
359 int timeout_or_status, enum snoop_when when,
360 unsigned char *data, unsigned data_len)
361{
362 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
363 static const char *dirs[] = {"out", "in"};
364 int ep;
365 const char *t, *d;
366
367 if (!usbfs_snoop)
368 return;
369
370 ep = usb_pipeendpoint(pipe);
371 t = types[usb_pipetype(pipe)];
372 d = dirs[!!usb_pipein(pipe)];
373
374 if (userurb) { /* Async */
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
377 "length %u\n",
378 userurb, ep, t, d, length);
379 else
380 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
381 "actual_length %u status %d\n",
382 userurb, ep, t, d, length,
383 timeout_or_status);
384 } else {
385 if (when == SUBMIT)
386 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
387 "timeout %d\n",
388 ep, t, d, length, timeout_or_status);
389 else
390 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
391 "status %d\n",
392 ep, t, d, length, timeout_or_status);
393 }
394
395 if (data && data_len > 0) {
396 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
397 data, data_len, 1);
398 }
399}
400
401static void snoop_urb_data(struct urb *urb, unsigned len)
402{
403 int i, size;
404
405 if (!usbfs_snoop)
406 return;
407
408 if (urb->num_sgs == 0) {
409 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
410 urb->transfer_buffer, len, 1);
411 return;
412 }
413
414 for (i = 0; i < urb->num_sgs && len; i++) {
415 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
416 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
417 sg_virt(&urb->sg[i]), size, 1);
418 len -= size;
419 }
420}
421
422static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
423{
424 unsigned i, len, size;
425
426 if (urb->number_of_packets > 0) /* Isochronous */
427 len = urb->transfer_buffer_length;
428 else /* Non-Isoc */
429 len = urb->actual_length;
430
431 if (urb->num_sgs == 0) {
432 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
433 return -EFAULT;
434 return 0;
435 }
436
437 for (i = 0; i < urb->num_sgs && len; i++) {
438 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
439 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
440 return -EFAULT;
441 userbuffer += size;
442 len -= size;
443 }
444
445 return 0;
446}
447
448#define AS_CONTINUATION 1
449#define AS_UNLINK 2
450
451static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
452__releases(ps->lock)
453__acquires(ps->lock)
454{
455 struct urb *urb;
456 struct async *as;
457
458 /* Mark all the pending URBs that match bulk_addr, up to but not
459 * including the first one without AS_CONTINUATION. If such an
460 * URB is encountered then a new transfer has already started so
461 * the endpoint doesn't need to be disabled; otherwise it does.
462 */
463 list_for_each_entry(as, &ps->async_pending, asynclist) {
464 if (as->bulk_addr == bulk_addr) {
465 if (as->bulk_status != AS_CONTINUATION)
466 goto rescan;
467 as->bulk_status = AS_UNLINK;
468 as->bulk_addr = 0;
469 }
470 }
471 ps->disabled_bulk_eps |= (1 << bulk_addr);
472
473 /* Now carefully unlink all the marked pending URBs */
474 rescan:
475 list_for_each_entry(as, &ps->async_pending, asynclist) {
476 if (as->bulk_status == AS_UNLINK) {
477 as->bulk_status = 0; /* Only once */
478 urb = as->urb;
479 usb_get_urb(urb);
480 spin_unlock(&ps->lock); /* Allow completions */
481 usb_unlink_urb(urb);
482 usb_put_urb(urb);
483 spin_lock(&ps->lock);
484 goto rescan;
485 }
486 }
487}
488
489static void async_completed(struct urb *urb)
490{
491 struct async *as = urb->context;
492 struct usb_dev_state *ps = as->ps;
493 struct siginfo sinfo;
494 struct pid *pid = NULL;
495 u32 secid = 0;
496 const struct cred *cred = NULL;
497 int signr;
498
499 spin_lock(&ps->lock);
500 list_move_tail(&as->asynclist, &ps->async_completed);
501 as->status = urb->status;
502 signr = as->signr;
503 if (signr) {
504 sinfo.si_signo = as->signr;
505 sinfo.si_errno = as->status;
506 sinfo.si_code = SI_ASYNCIO;
507 sinfo.si_addr = as->userurb;
508 pid = get_pid(as->pid);
509 cred = get_cred(as->cred);
510 secid = as->secid;
511 }
512 snoop(&urb->dev->dev, "urb complete\n");
513 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
514 as->status, COMPLETE, NULL, 0);
515 if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
516 snoop_urb_data(urb, urb->actual_length);
517
518 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
519 as->status != -ENOENT)
520 cancel_bulk_urbs(ps, as->bulk_addr);
521 spin_unlock(&ps->lock);
522
523 if (signr) {
524 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
525 put_pid(pid);
526 put_cred(cred);
527 }
528
529 wake_up(&ps->wait);
530}
531
532static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
533{
534 struct urb *urb;
535 struct async *as;
536 unsigned long flags;
537
538 spin_lock_irqsave(&ps->lock, flags);
539 while (!list_empty(list)) {
540 as = list_entry(list->next, struct async, asynclist);
541 list_del_init(&as->asynclist);
542 urb = as->urb;
543 usb_get_urb(urb);
544
545 /* drop the spinlock so the completion handler can run */
546 spin_unlock_irqrestore(&ps->lock, flags);
547 usb_kill_urb(urb);
548 usb_put_urb(urb);
549 spin_lock_irqsave(&ps->lock, flags);
550 }
551 spin_unlock_irqrestore(&ps->lock, flags);
552}
553
554static void destroy_async_on_interface(struct usb_dev_state *ps,
555 unsigned int ifnum)
556{
557 struct list_head *p, *q, hitlist;
558 unsigned long flags;
559
560 INIT_LIST_HEAD(&hitlist);
561 spin_lock_irqsave(&ps->lock, flags);
562 list_for_each_safe(p, q, &ps->async_pending)
563 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
564 list_move_tail(p, &hitlist);
565 spin_unlock_irqrestore(&ps->lock, flags);
566 destroy_async(ps, &hitlist);
567}
568
569static void destroy_all_async(struct usb_dev_state *ps)
570{
571 destroy_async(ps, &ps->async_pending);
572}
573
574/*
575 * interface claims are made only at the request of user level code,
576 * which can also release them (explicitly or by closing files).
577 * they're also undone when devices disconnect.
578 */
579
580static int driver_probe(struct usb_interface *intf,
581 const struct usb_device_id *id)
582{
583 return -ENODEV;
584}
585
586static void driver_disconnect(struct usb_interface *intf)
587{
588 struct usb_dev_state *ps = usb_get_intfdata(intf);
589 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
590
591 if (!ps)
592 return;
593
594 /* NOTE: this relies on usbcore having canceled and completed
595 * all pending I/O requests; 2.6 does that.
596 */
597
598 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
599 clear_bit(ifnum, &ps->ifclaimed);
600 else
601 dev_warn(&intf->dev, "interface number %u out of range\n",
602 ifnum);
603
604 usb_set_intfdata(intf, NULL);
605
606 /* force async requests to complete */
607 destroy_async_on_interface(ps, ifnum);
608}
609
610/* The following routines are merely placeholders. There is no way
611 * to inform a user task about suspend or resumes.
612 */
613static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
614{
615 return 0;
616}
617
618static int driver_resume(struct usb_interface *intf)
619{
620 return 0;
621}
622
623struct usb_driver usbfs_driver = {
624 .name = "usbfs",
625 .probe = driver_probe,
626 .disconnect = driver_disconnect,
627 .suspend = driver_suspend,
628 .resume = driver_resume,
629};
630
631static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
632{
633 struct usb_device *dev = ps->dev;
634 struct usb_interface *intf;
635 int err;
636
637 if (ifnum >= 8*sizeof(ps->ifclaimed))
638 return -EINVAL;
639 /* already claimed */
640 if (test_bit(ifnum, &ps->ifclaimed))
641 return 0;
642
643 intf = usb_ifnum_to_if(dev, ifnum);
644 if (!intf)
645 err = -ENOENT;
646 else
647 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
648 if (err == 0)
649 set_bit(ifnum, &ps->ifclaimed);
650 return err;
651}
652
653static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
654{
655 struct usb_device *dev;
656 struct usb_interface *intf;
657 int err;
658
659 err = -EINVAL;
660 if (ifnum >= 8*sizeof(ps->ifclaimed))
661 return err;
662 dev = ps->dev;
663 intf = usb_ifnum_to_if(dev, ifnum);
664 if (!intf)
665 err = -ENOENT;
666 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
667 usb_driver_release_interface(&usbfs_driver, intf);
668 err = 0;
669 }
670 return err;
671}
672
673static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
674{
675 if (ps->dev->state != USB_STATE_CONFIGURED)
676 return -EHOSTUNREACH;
677 if (ifnum >= 8*sizeof(ps->ifclaimed))
678 return -EINVAL;
679 if (test_bit(ifnum, &ps->ifclaimed))
680 return 0;
681 /* if not yet claimed, claim it for the driver */
682 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
683 "interface %u before use\n", task_pid_nr(current),
684 current->comm, ifnum);
685 return claimintf(ps, ifnum);
686}
687
688static int findintfep(struct usb_device *dev, unsigned int ep)
689{
690 unsigned int i, j, e;
691 struct usb_interface *intf;
692 struct usb_host_interface *alts;
693 struct usb_endpoint_descriptor *endpt;
694
695 if (ep & ~(USB_DIR_IN|0xf))
696 return -EINVAL;
697 if (!dev->actconfig)
698 return -ESRCH;
699 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
700 intf = dev->actconfig->interface[i];
701 for (j = 0; j < intf->num_altsetting; j++) {
702 alts = &intf->altsetting[j];
703 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
704 endpt = &alts->endpoint[e].desc;
705 if (endpt->bEndpointAddress == ep)
706 return alts->desc.bInterfaceNumber;
707 }
708 }
709 }
710 return -ENOENT;
711}
712
713static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
714 unsigned int request, unsigned int index)
715{
716 int ret = 0;
717 struct usb_host_interface *alt_setting;
718
719 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
720 && ps->dev->state != USB_STATE_ADDRESS
721 && ps->dev->state != USB_STATE_CONFIGURED)
722 return -EHOSTUNREACH;
723 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
724 return 0;
725
726 /*
727 * check for the special corner case 'get_device_id' in the printer
728 * class specification, which we always want to allow as it is used
729 * to query things like ink level, etc.
730 */
731 if (requesttype == 0xa1 && request == 0) {
732 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
733 index >> 8, index & 0xff);
734 if (alt_setting
735 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
736 return 0;
737 }
738
739 index &= 0xff;
740 switch (requesttype & USB_RECIP_MASK) {
741 case USB_RECIP_ENDPOINT:
742 if ((index & ~USB_DIR_IN) == 0)
743 return 0;
744 ret = findintfep(ps->dev, index);
745 if (ret < 0) {
746 /*
747 * Some not fully compliant Win apps seem to get
748 * index wrong and have the endpoint number here
749 * rather than the endpoint address (with the
750 * correct direction). Win does let this through,
751 * so we'll not reject it here but leave it to
752 * the device to not break KVM. But we warn.
753 */
754 ret = findintfep(ps->dev, index ^ 0x80);
755 if (ret >= 0)
756 dev_info(&ps->dev->dev,
757 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
758 __func__, task_pid_nr(current),
759 current->comm, index, index ^ 0x80);
760 }
761 if (ret >= 0)
762 ret = checkintf(ps, ret);
763 break;
764
765 case USB_RECIP_INTERFACE:
766 ret = checkintf(ps, index);
767 break;
768 }
769 return ret;
770}
771
772static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
773 unsigned char ep)
774{
775 if (ep & USB_ENDPOINT_DIR_MASK)
776 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
777 else
778 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
779}
780
781static int parse_usbdevfs_streams(struct usb_dev_state *ps,
782 struct usbdevfs_streams __user *streams,
783 unsigned int *num_streams_ret,
784 unsigned int *num_eps_ret,
785 struct usb_host_endpoint ***eps_ret,
786 struct usb_interface **intf_ret)
787{
788 unsigned int i, num_streams, num_eps;
789 struct usb_host_endpoint **eps;
790 struct usb_interface *intf = NULL;
791 unsigned char ep;
792 int ifnum, ret;
793
794 if (get_user(num_streams, &streams->num_streams) ||
795 get_user(num_eps, &streams->num_eps))
796 return -EFAULT;
797
798 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
799 return -EINVAL;
800
801 /* The XHCI controller allows max 2 ^ 16 streams */
802 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
803 return -EINVAL;
804
805 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
806 if (!eps)
807 return -ENOMEM;
808
809 for (i = 0; i < num_eps; i++) {
810 if (get_user(ep, &streams->eps[i])) {
811 ret = -EFAULT;
812 goto error;
813 }
814 eps[i] = ep_to_host_endpoint(ps->dev, ep);
815 if (!eps[i]) {
816 ret = -EINVAL;
817 goto error;
818 }
819
820 /* usb_alloc/free_streams operate on an usb_interface */
821 ifnum = findintfep(ps->dev, ep);
822 if (ifnum < 0) {
823 ret = ifnum;
824 goto error;
825 }
826
827 if (i == 0) {
828 ret = checkintf(ps, ifnum);
829 if (ret < 0)
830 goto error;
831 intf = usb_ifnum_to_if(ps->dev, ifnum);
832 } else {
833 /* Verify all eps belong to the same interface */
834 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
835 ret = -EINVAL;
836 goto error;
837 }
838 }
839 }
840
841 if (num_streams_ret)
842 *num_streams_ret = num_streams;
843 *num_eps_ret = num_eps;
844 *eps_ret = eps;
845 *intf_ret = intf;
846
847 return 0;
848
849error:
850 kfree(eps);
851 return ret;
852}
853
854static int match_devt(struct device *dev, void *data)
855{
856 return dev->devt == (dev_t) (unsigned long) data;
857}
858
859static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
860{
861 struct device *dev;
862
863 dev = bus_find_device(&usb_bus_type, NULL,
864 (void *) (unsigned long) devt, match_devt);
865 if (!dev)
866 return NULL;
867 return container_of(dev, struct usb_device, dev);
868}
869
870/*
871 * file operations
872 */
873static int usbdev_open(struct inode *inode, struct file *file)
874{
875 struct usb_device *dev = NULL;
876 struct usb_dev_state *ps;
877 int ret;
878
879 ret = -ENOMEM;
880 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
881 if (!ps)
882 goto out_free_ps;
883
884 ret = -ENODEV;
885
886 /* Protect against simultaneous removal or release */
887 mutex_lock(&usbfs_mutex);
888
889 /* usbdev device-node */
890 if (imajor(inode) == USB_DEVICE_MAJOR)
891 dev = usbdev_lookup_by_devt(inode->i_rdev);
892
893 mutex_unlock(&usbfs_mutex);
894
895 if (!dev)
896 goto out_free_ps;
897
898 usb_lock_device(dev);
899 if (dev->state == USB_STATE_NOTATTACHED)
900 goto out_unlock_device;
901
902 ret = usb_autoresume_device(dev);
903 if (ret)
904 goto out_unlock_device;
905
906 ps->dev = dev;
907 ps->file = file;
908 spin_lock_init(&ps->lock);
909 INIT_LIST_HEAD(&ps->list);
910 INIT_LIST_HEAD(&ps->async_pending);
911 INIT_LIST_HEAD(&ps->async_completed);
912 init_waitqueue_head(&ps->wait);
913 ps->discsignr = 0;
914 ps->disc_pid = get_pid(task_pid(current));
915 ps->cred = get_current_cred();
916 ps->disccontext = NULL;
917 ps->ifclaimed = 0;
918 security_task_getsecid(current, &ps->secid);
919 smp_wmb();
920 list_add_tail(&ps->list, &dev->filelist);
921 file->private_data = ps;
922 usb_unlock_device(dev);
923 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
924 current->comm);
925 return ret;
926
927 out_unlock_device:
928 usb_unlock_device(dev);
929 usb_put_dev(dev);
930 out_free_ps:
931 kfree(ps);
932 return ret;
933}
934
935static int usbdev_release(struct inode *inode, struct file *file)
936{
937 struct usb_dev_state *ps = file->private_data;
938 struct usb_device *dev = ps->dev;
939 unsigned int ifnum;
940 struct async *as;
941
942 usb_lock_device(dev);
943 usb_hub_release_all_ports(dev, ps);
944
945 list_del_init(&ps->list);
946
947 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
948 ifnum++) {
949 if (test_bit(ifnum, &ps->ifclaimed))
950 releaseintf(ps, ifnum);
951 }
952 destroy_all_async(ps);
953 usb_autosuspend_device(dev);
954 usb_unlock_device(dev);
955 usb_put_dev(dev);
956 put_pid(ps->disc_pid);
957 put_cred(ps->cred);
958
959 as = async_getcompleted(ps);
960 while (as) {
961 free_async(as);
962 as = async_getcompleted(ps);
963 }
964 kfree(ps);
965 return 0;
966}
967
968static int proc_control(struct usb_dev_state *ps, void __user *arg)
969{
970 struct usb_device *dev = ps->dev;
971 struct usbdevfs_ctrltransfer ctrl;
972 unsigned int tmo;
973 unsigned char *tbuf;
974 unsigned wLength;
975 int i, pipe, ret;
976
977 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
978 return -EFAULT;
979 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
980 ctrl.wIndex);
981 if (ret)
982 return ret;
983 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
984 if (wLength > PAGE_SIZE)
985 return -EINVAL;
986 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
987 sizeof(struct usb_ctrlrequest));
988 if (ret)
989 return ret;
990 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
991 if (!tbuf) {
992 ret = -ENOMEM;
993 goto done;
994 }
995 tmo = ctrl.timeout;
996 snoop(&dev->dev, "control urb: bRequestType=%02x "
997 "bRequest=%02x wValue=%04x "
998 "wIndex=%04x wLength=%04x\n",
999 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1000 ctrl.wIndex, ctrl.wLength);
1001 if (ctrl.bRequestType & 0x80) {
1002 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1003 ctrl.wLength)) {
1004 ret = -EINVAL;
1005 goto done;
1006 }
1007 pipe = usb_rcvctrlpipe(dev, 0);
1008 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1009
1010 usb_unlock_device(dev);
1011 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1012 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1013 tbuf, ctrl.wLength, tmo);
1014 usb_lock_device(dev);
1015 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1016 tbuf, max(i, 0));
1017 if ((i > 0) && ctrl.wLength) {
1018 if (copy_to_user(ctrl.data, tbuf, i)) {
1019 ret = -EFAULT;
1020 goto done;
1021 }
1022 }
1023 } else {
1024 if (ctrl.wLength) {
1025 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1026 ret = -EFAULT;
1027 goto done;
1028 }
1029 }
1030 pipe = usb_sndctrlpipe(dev, 0);
1031 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1032 tbuf, ctrl.wLength);
1033
1034 usb_unlock_device(dev);
1035 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1036 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1037 tbuf, ctrl.wLength, tmo);
1038 usb_lock_device(dev);
1039 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1040 }
1041 if (i < 0 && i != -EPIPE) {
1042 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1043 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1044 current->comm, ctrl.bRequestType, ctrl.bRequest,
1045 ctrl.wLength, i);
1046 }
1047 ret = i;
1048 done:
1049 free_page((unsigned long) tbuf);
1050 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1051 sizeof(struct usb_ctrlrequest));
1052 return ret;
1053}
1054
1055static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1056{
1057 struct usb_device *dev = ps->dev;
1058 struct usbdevfs_bulktransfer bulk;
1059 unsigned int tmo, len1, pipe;
1060 int len2;
1061 unsigned char *tbuf;
1062 int i, ret;
1063
1064 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1065 return -EFAULT;
1066 ret = findintfep(ps->dev, bulk.ep);
1067 if (ret < 0)
1068 return ret;
1069 ret = checkintf(ps, ret);
1070 if (ret)
1071 return ret;
1072 if (bulk.ep & USB_DIR_IN)
1073 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1074 else
1075 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1076 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1077 return -EINVAL;
1078 len1 = bulk.len;
1079 if (len1 >= USBFS_XFER_MAX)
1080 return -EINVAL;
1081 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1082 if (ret)
1083 return ret;
1084 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1085 ret = -ENOMEM;
1086 goto done;
1087 }
1088 tmo = bulk.timeout;
1089 if (bulk.ep & 0x80) {
1090 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1091 ret = -EINVAL;
1092 goto done;
1093 }
1094 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1095
1096 usb_unlock_device(dev);
1097 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1098 usb_lock_device(dev);
1099 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1100
1101 if (!i && len2) {
1102 if (copy_to_user(bulk.data, tbuf, len2)) {
1103 ret = -EFAULT;
1104 goto done;
1105 }
1106 }
1107 } else {
1108 if (len1) {
1109 if (copy_from_user(tbuf, bulk.data, len1)) {
1110 ret = -EFAULT;
1111 goto done;
1112 }
1113 }
1114 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1115
1116 usb_unlock_device(dev);
1117 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1118 usb_lock_device(dev);
1119 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1120 }
1121 ret = (i < 0 ? i : len2);
1122 done:
1123 kfree(tbuf);
1124 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1125 return ret;
1126}
1127
1128static void check_reset_of_active_ep(struct usb_device *udev,
1129 unsigned int epnum, char *ioctl_name)
1130{
1131 struct usb_host_endpoint **eps;
1132 struct usb_host_endpoint *ep;
1133
1134 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1135 ep = eps[epnum & 0x0f];
1136 if (ep && !list_empty(&ep->urb_list))
1137 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1138 task_pid_nr(current), current->comm,
1139 ioctl_name, epnum);
1140}
1141
1142static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1143{
1144 unsigned int ep;
1145 int ret;
1146
1147 if (get_user(ep, (unsigned int __user *)arg))
1148 return -EFAULT;
1149 ret = findintfep(ps->dev, ep);
1150 if (ret < 0)
1151 return ret;
1152 ret = checkintf(ps, ret);
1153 if (ret)
1154 return ret;
1155 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1156 usb_reset_endpoint(ps->dev, ep);
1157 return 0;
1158}
1159
1160static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1161{
1162 unsigned int ep;
1163 int pipe;
1164 int ret;
1165
1166 if (get_user(ep, (unsigned int __user *)arg))
1167 return -EFAULT;
1168 ret = findintfep(ps->dev, ep);
1169 if (ret < 0)
1170 return ret;
1171 ret = checkintf(ps, ret);
1172 if (ret)
1173 return ret;
1174 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1175 if (ep & USB_DIR_IN)
1176 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1177 else
1178 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1179
1180 return usb_clear_halt(ps->dev, pipe);
1181}
1182
1183static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1184{
1185 struct usbdevfs_getdriver gd;
1186 struct usb_interface *intf;
1187 int ret;
1188
1189 if (copy_from_user(&gd, arg, sizeof(gd)))
1190 return -EFAULT;
1191 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1192 if (!intf || !intf->dev.driver)
1193 ret = -ENODATA;
1194 else {
1195 strlcpy(gd.driver, intf->dev.driver->name,
1196 sizeof(gd.driver));
1197 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1198 }
1199 return ret;
1200}
1201
1202static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1203{
1204 struct usbdevfs_connectinfo ci = {
1205 .devnum = ps->dev->devnum,
1206 .slow = ps->dev->speed == USB_SPEED_LOW
1207 };
1208
1209 if (copy_to_user(arg, &ci, sizeof(ci)))
1210 return -EFAULT;
1211 return 0;
1212}
1213
1214static int proc_resetdevice(struct usb_dev_state *ps)
1215{
1216 return usb_reset_device(ps->dev);
1217}
1218
1219static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1220{
1221 struct usbdevfs_setinterface setintf;
1222 int ret;
1223
1224 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1225 return -EFAULT;
1226 if ((ret = checkintf(ps, setintf.interface)))
1227 return ret;
1228
1229 destroy_async_on_interface(ps, setintf.interface);
1230
1231 return usb_set_interface(ps->dev, setintf.interface,
1232 setintf.altsetting);
1233}
1234
1235static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1236{
1237 int u;
1238 int status = 0;
1239 struct usb_host_config *actconfig;
1240
1241 if (get_user(u, (int __user *)arg))
1242 return -EFAULT;
1243
1244 actconfig = ps->dev->actconfig;
1245
1246 /* Don't touch the device if any interfaces are claimed.
1247 * It could interfere with other drivers' operations, and if
1248 * an interface is claimed by usbfs it could easily deadlock.
1249 */
1250 if (actconfig) {
1251 int i;
1252
1253 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1254 if (usb_interface_claimed(actconfig->interface[i])) {
1255 dev_warn(&ps->dev->dev,
1256 "usbfs: interface %d claimed by %s "
1257 "while '%s' sets config #%d\n",
1258 actconfig->interface[i]
1259 ->cur_altsetting
1260 ->desc.bInterfaceNumber,
1261 actconfig->interface[i]
1262 ->dev.driver->name,
1263 current->comm, u);
1264 status = -EBUSY;
1265 break;
1266 }
1267 }
1268 }
1269
1270 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1271 * so avoid usb_set_configuration()'s kick to sysfs
1272 */
1273 if (status == 0) {
1274 if (actconfig && actconfig->desc.bConfigurationValue == u)
1275 status = usb_reset_configuration(ps->dev);
1276 else
1277 status = usb_set_configuration(ps->dev, u);
1278 }
1279
1280 return status;
1281}
1282
1283static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1284 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1285 void __user *arg)
1286{
1287 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1288 struct usb_host_endpoint *ep;
1289 struct async *as = NULL;
1290 struct usb_ctrlrequest *dr = NULL;
1291 unsigned int u, totlen, isofrmlen;
1292 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1293 int number_of_packets = 0;
1294 unsigned int stream_id = 0;
1295 void *buf;
1296
1297 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1298 USBDEVFS_URB_SHORT_NOT_OK |
1299 USBDEVFS_URB_BULK_CONTINUATION |
1300 USBDEVFS_URB_NO_FSBR |
1301 USBDEVFS_URB_ZERO_PACKET |
1302 USBDEVFS_URB_NO_INTERRUPT))
1303 return -EINVAL;
1304 if (uurb->buffer_length > 0 && !uurb->buffer)
1305 return -EINVAL;
1306 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1307 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1308 ifnum = findintfep(ps->dev, uurb->endpoint);
1309 if (ifnum < 0)
1310 return ifnum;
1311 ret = checkintf(ps, ifnum);
1312 if (ret)
1313 return ret;
1314 }
1315 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1316 if (!ep)
1317 return -ENOENT;
1318 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1319
1320 u = 0;
1321 switch(uurb->type) {
1322 case USBDEVFS_URB_TYPE_CONTROL:
1323 if (!usb_endpoint_xfer_control(&ep->desc))
1324 return -EINVAL;
1325 /* min 8 byte setup packet */
1326 if (uurb->buffer_length < 8)
1327 return -EINVAL;
1328 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1329 if (!dr)
1330 return -ENOMEM;
1331 if (copy_from_user(dr, uurb->buffer, 8)) {
1332 ret = -EFAULT;
1333 goto error;
1334 }
1335 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1336 ret = -EINVAL;
1337 goto error;
1338 }
1339 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1340 le16_to_cpup(&dr->wIndex));
1341 if (ret)
1342 goto error;
1343 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1344 uurb->buffer += 8;
1345 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1346 is_in = 1;
1347 uurb->endpoint |= USB_DIR_IN;
1348 } else {
1349 is_in = 0;
1350 uurb->endpoint &= ~USB_DIR_IN;
1351 }
1352 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1353 "bRequest=%02x wValue=%04x "
1354 "wIndex=%04x wLength=%04x\n",
1355 dr->bRequestType, dr->bRequest,
1356 __le16_to_cpup(&dr->wValue),
1357 __le16_to_cpup(&dr->wIndex),
1358 __le16_to_cpup(&dr->wLength));
1359 u = sizeof(struct usb_ctrlrequest);
1360 break;
1361
1362 case USBDEVFS_URB_TYPE_BULK:
1363 switch (usb_endpoint_type(&ep->desc)) {
1364 case USB_ENDPOINT_XFER_CONTROL:
1365 case USB_ENDPOINT_XFER_ISOC:
1366 return -EINVAL;
1367 case USB_ENDPOINT_XFER_INT:
1368 /* allow single-shot interrupt transfers */
1369 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1370 goto interrupt_urb;
1371 }
1372 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1373 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1374 num_sgs = 0;
1375 if (ep->streams)
1376 stream_id = uurb->stream_id;
1377 break;
1378
1379 case USBDEVFS_URB_TYPE_INTERRUPT:
1380 if (!usb_endpoint_xfer_int(&ep->desc))
1381 return -EINVAL;
1382 interrupt_urb:
1383 break;
1384
1385 case USBDEVFS_URB_TYPE_ISO:
1386 /* arbitrary limit */
1387 if (uurb->number_of_packets < 1 ||
1388 uurb->number_of_packets > 128)
1389 return -EINVAL;
1390 if (!usb_endpoint_xfer_isoc(&ep->desc))
1391 return -EINVAL;
1392 number_of_packets = uurb->number_of_packets;
1393 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1394 number_of_packets;
1395 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1396 return -ENOMEM;
1397 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1398 ret = -EFAULT;
1399 goto error;
1400 }
1401 for (totlen = u = 0; u < number_of_packets; u++) {
1402 /*
1403 * arbitrary limit need for USB 3.0
1404 * bMaxBurst (0~15 allowed, 1~16 packets)
1405 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1406 * sizemax: 1024 * 16 * 3 = 49152
1407 */
1408 if (isopkt[u].length > 49152) {
1409 ret = -EINVAL;
1410 goto error;
1411 }
1412 totlen += isopkt[u].length;
1413 }
1414 u *= sizeof(struct usb_iso_packet_descriptor);
1415 uurb->buffer_length = totlen;
1416 break;
1417
1418 default:
1419 return -EINVAL;
1420 }
1421
1422 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1423 ret = -EINVAL;
1424 goto error;
1425 }
1426 if (uurb->buffer_length > 0 &&
1427 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1428 uurb->buffer, uurb->buffer_length)) {
1429 ret = -EFAULT;
1430 goto error;
1431 }
1432 as = alloc_async(number_of_packets);
1433 if (!as) {
1434 ret = -ENOMEM;
1435 goto error;
1436 }
1437
1438 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1439 num_sgs * sizeof(struct scatterlist);
1440 ret = usbfs_increase_memory_usage(u);
1441 if (ret)
1442 goto error;
1443 as->mem_usage = u;
1444
1445 if (num_sgs) {
1446 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1447 GFP_KERNEL);
1448 if (!as->urb->sg) {
1449 ret = -ENOMEM;
1450 goto error;
1451 }
1452 as->urb->num_sgs = num_sgs;
1453 sg_init_table(as->urb->sg, as->urb->num_sgs);
1454
1455 totlen = uurb->buffer_length;
1456 for (i = 0; i < as->urb->num_sgs; i++) {
1457 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1458 buf = kmalloc(u, GFP_KERNEL);
1459 if (!buf) {
1460 ret = -ENOMEM;
1461 goto error;
1462 }
1463 sg_set_buf(&as->urb->sg[i], buf, u);
1464
1465 if (!is_in) {
1466 if (copy_from_user(buf, uurb->buffer, u)) {
1467 ret = -EFAULT;
1468 goto error;
1469 }
1470 uurb->buffer += u;
1471 }
1472 totlen -= u;
1473 }
1474 } else if (uurb->buffer_length > 0) {
1475 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1476 GFP_KERNEL);
1477 if (!as->urb->transfer_buffer) {
1478 ret = -ENOMEM;
1479 goto error;
1480 }
1481
1482 if (!is_in) {
1483 if (copy_from_user(as->urb->transfer_buffer,
1484 uurb->buffer,
1485 uurb->buffer_length)) {
1486 ret = -EFAULT;
1487 goto error;
1488 }
1489 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1490 /*
1491 * Isochronous input data may end up being
1492 * discontiguous if some of the packets are short.
1493 * Clear the buffer so that the gaps don't leak
1494 * kernel data to userspace.
1495 */
1496 memset(as->urb->transfer_buffer, 0,
1497 uurb->buffer_length);
1498 }
1499 }
1500 as->urb->dev = ps->dev;
1501 as->urb->pipe = (uurb->type << 30) |
1502 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1503 (uurb->endpoint & USB_DIR_IN);
1504
1505 /* This tedious sequence is necessary because the URB_* flags
1506 * are internal to the kernel and subject to change, whereas
1507 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1508 */
1509 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1510 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1511 u |= URB_ISO_ASAP;
1512 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1513 u |= URB_SHORT_NOT_OK;
1514 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1515 u |= URB_NO_FSBR;
1516 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1517 u |= URB_ZERO_PACKET;
1518 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1519 u |= URB_NO_INTERRUPT;
1520 as->urb->transfer_flags = u;
1521
1522 as->urb->transfer_buffer_length = uurb->buffer_length;
1523 as->urb->setup_packet = (unsigned char *)dr;
1524 dr = NULL;
1525 as->urb->start_frame = uurb->start_frame;
1526 as->urb->number_of_packets = number_of_packets;
1527 as->urb->stream_id = stream_id;
1528 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1529 ps->dev->speed == USB_SPEED_HIGH)
1530 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1531 else
1532 as->urb->interval = ep->desc.bInterval;
1533 as->urb->context = as;
1534 as->urb->complete = async_completed;
1535 for (totlen = u = 0; u < number_of_packets; u++) {
1536 as->urb->iso_frame_desc[u].offset = totlen;
1537 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1538 totlen += isopkt[u].length;
1539 }
1540 kfree(isopkt);
1541 isopkt = NULL;
1542 as->ps = ps;
1543 as->userurb = arg;
1544 if (is_in && uurb->buffer_length > 0)
1545 as->userbuffer = uurb->buffer;
1546 else
1547 as->userbuffer = NULL;
1548 as->signr = uurb->signr;
1549 as->ifnum = ifnum;
1550 as->pid = get_pid(task_pid(current));
1551 as->cred = get_current_cred();
1552 security_task_getsecid(current, &as->secid);
1553 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1554 as->urb->transfer_buffer_length, 0, SUBMIT,
1555 NULL, 0);
1556 if (!is_in)
1557 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1558
1559 async_newpending(as);
1560
1561 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1562 spin_lock_irq(&ps->lock);
1563
1564 /* Not exactly the endpoint address; the direction bit is
1565 * shifted to the 0x10 position so that the value will be
1566 * between 0 and 31.
1567 */
1568 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1569 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1570 >> 3);
1571
1572 /* If this bulk URB is the start of a new transfer, re-enable
1573 * the endpoint. Otherwise mark it as a continuation URB.
1574 */
1575 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1576 as->bulk_status = AS_CONTINUATION;
1577 else
1578 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1579
1580 /* Don't accept continuation URBs if the endpoint is
1581 * disabled because of an earlier error.
1582 */
1583 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1584 ret = -EREMOTEIO;
1585 else
1586 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1587 spin_unlock_irq(&ps->lock);
1588 } else {
1589 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1590 }
1591
1592 if (ret) {
1593 dev_printk(KERN_DEBUG, &ps->dev->dev,
1594 "usbfs: usb_submit_urb returned %d\n", ret);
1595 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1596 0, ret, COMPLETE, NULL, 0);
1597 async_removepending(as);
1598 goto error;
1599 }
1600 return 0;
1601
1602 error:
1603 kfree(isopkt);
1604 kfree(dr);
1605 if (as)
1606 free_async(as);
1607 return ret;
1608}
1609
1610static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1611{
1612 struct usbdevfs_urb uurb;
1613
1614 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1615 return -EFAULT;
1616
1617 return proc_do_submiturb(ps, &uurb,
1618 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1619 arg);
1620}
1621
1622static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1623{
1624 struct urb *urb;
1625 struct async *as;
1626 unsigned long flags;
1627
1628 spin_lock_irqsave(&ps->lock, flags);
1629 as = async_getpending(ps, arg);
1630 if (!as) {
1631 spin_unlock_irqrestore(&ps->lock, flags);
1632 return -EINVAL;
1633 }
1634
1635 urb = as->urb;
1636 usb_get_urb(urb);
1637 spin_unlock_irqrestore(&ps->lock, flags);
1638
1639 usb_kill_urb(urb);
1640 usb_put_urb(urb);
1641
1642 return 0;
1643}
1644
1645static int processcompl(struct async *as, void __user * __user *arg)
1646{
1647 struct urb *urb = as->urb;
1648 struct usbdevfs_urb __user *userurb = as->userurb;
1649 void __user *addr = as->userurb;
1650 unsigned int i;
1651
1652 if (as->userbuffer && urb->actual_length) {
1653 if (copy_urb_data_to_user(as->userbuffer, urb))
1654 goto err_out;
1655 }
1656 if (put_user(as->status, &userurb->status))
1657 goto err_out;
1658 if (put_user(urb->actual_length, &userurb->actual_length))
1659 goto err_out;
1660 if (put_user(urb->error_count, &userurb->error_count))
1661 goto err_out;
1662
1663 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1664 for (i = 0; i < urb->number_of_packets; i++) {
1665 if (put_user(urb->iso_frame_desc[i].actual_length,
1666 &userurb->iso_frame_desc[i].actual_length))
1667 goto err_out;
1668 if (put_user(urb->iso_frame_desc[i].status,
1669 &userurb->iso_frame_desc[i].status))
1670 goto err_out;
1671 }
1672 }
1673
1674 if (put_user(addr, (void __user * __user *)arg))
1675 return -EFAULT;
1676 return 0;
1677
1678err_out:
1679 return -EFAULT;
1680}
1681
1682static struct async *reap_as(struct usb_dev_state *ps)
1683{
1684 DECLARE_WAITQUEUE(wait, current);
1685 struct async *as = NULL;
1686 struct usb_device *dev = ps->dev;
1687
1688 add_wait_queue(&ps->wait, &wait);
1689 for (;;) {
1690 __set_current_state(TASK_INTERRUPTIBLE);
1691 as = async_getcompleted(ps);
1692 if (as)
1693 break;
1694 if (signal_pending(current))
1695 break;
1696 usb_unlock_device(dev);
1697 schedule();
1698 usb_lock_device(dev);
1699 }
1700 remove_wait_queue(&ps->wait, &wait);
1701 set_current_state(TASK_RUNNING);
1702 return as;
1703}
1704
1705static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1706{
1707 struct async *as = reap_as(ps);
1708 if (as) {
1709 int retval = processcompl(as, (void __user * __user *)arg);
1710 free_async(as);
1711 return retval;
1712 }
1713 if (signal_pending(current))
1714 return -EINTR;
1715 return -EIO;
1716}
1717
1718static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1719{
1720 int retval;
1721 struct async *as;
1722
1723 as = async_getcompleted(ps);
1724 retval = -EAGAIN;
1725 if (as) {
1726 retval = processcompl(as, (void __user * __user *)arg);
1727 free_async(as);
1728 }
1729 return retval;
1730}
1731
1732#ifdef CONFIG_COMPAT
1733static int proc_control_compat(struct usb_dev_state *ps,
1734 struct usbdevfs_ctrltransfer32 __user *p32)
1735{
1736 struct usbdevfs_ctrltransfer __user *p;
1737 __u32 udata;
1738 p = compat_alloc_user_space(sizeof(*p));
1739 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1740 get_user(udata, &p32->data) ||
1741 put_user(compat_ptr(udata), &p->data))
1742 return -EFAULT;
1743 return proc_control(ps, p);
1744}
1745
1746static int proc_bulk_compat(struct usb_dev_state *ps,
1747 struct usbdevfs_bulktransfer32 __user *p32)
1748{
1749 struct usbdevfs_bulktransfer __user *p;
1750 compat_uint_t n;
1751 compat_caddr_t addr;
1752
1753 p = compat_alloc_user_space(sizeof(*p));
1754
1755 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1756 get_user(n, &p32->len) || put_user(n, &p->len) ||
1757 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1758 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1759 return -EFAULT;
1760
1761 return proc_bulk(ps, p);
1762}
1763static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1764{
1765 struct usbdevfs_disconnectsignal32 ds;
1766
1767 if (copy_from_user(&ds, arg, sizeof(ds)))
1768 return -EFAULT;
1769 ps->discsignr = ds.signr;
1770 ps->disccontext = compat_ptr(ds.context);
1771 return 0;
1772}
1773
1774static int get_urb32(struct usbdevfs_urb *kurb,
1775 struct usbdevfs_urb32 __user *uurb)
1776{
1777 __u32 uptr;
1778 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1779 __get_user(kurb->type, &uurb->type) ||
1780 __get_user(kurb->endpoint, &uurb->endpoint) ||
1781 __get_user(kurb->status, &uurb->status) ||
1782 __get_user(kurb->flags, &uurb->flags) ||
1783 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1784 __get_user(kurb->actual_length, &uurb->actual_length) ||
1785 __get_user(kurb->start_frame, &uurb->start_frame) ||
1786 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1787 __get_user(kurb->error_count, &uurb->error_count) ||
1788 __get_user(kurb->signr, &uurb->signr))
1789 return -EFAULT;
1790
1791 if (__get_user(uptr, &uurb->buffer))
1792 return -EFAULT;
1793 kurb->buffer = compat_ptr(uptr);
1794 if (__get_user(uptr, &uurb->usercontext))
1795 return -EFAULT;
1796 kurb->usercontext = compat_ptr(uptr);
1797
1798 return 0;
1799}
1800
1801static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1802{
1803 struct usbdevfs_urb uurb;
1804
1805 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1806 return -EFAULT;
1807
1808 return proc_do_submiturb(ps, &uurb,
1809 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1810 arg);
1811}
1812
1813static int processcompl_compat(struct async *as, void __user * __user *arg)
1814{
1815 struct urb *urb = as->urb;
1816 struct usbdevfs_urb32 __user *userurb = as->userurb;
1817 void __user *addr = as->userurb;
1818 unsigned int i;
1819
1820 if (as->userbuffer && urb->actual_length) {
1821 if (copy_urb_data_to_user(as->userbuffer, urb))
1822 return -EFAULT;
1823 }
1824 if (put_user(as->status, &userurb->status))
1825 return -EFAULT;
1826 if (put_user(urb->actual_length, &userurb->actual_length))
1827 return -EFAULT;
1828 if (put_user(urb->error_count, &userurb->error_count))
1829 return -EFAULT;
1830
1831 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1832 for (i = 0; i < urb->number_of_packets; i++) {
1833 if (put_user(urb->iso_frame_desc[i].actual_length,
1834 &userurb->iso_frame_desc[i].actual_length))
1835 return -EFAULT;
1836 if (put_user(urb->iso_frame_desc[i].status,
1837 &userurb->iso_frame_desc[i].status))
1838 return -EFAULT;
1839 }
1840 }
1841
1842 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1843 return -EFAULT;
1844 return 0;
1845}
1846
1847static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1848{
1849 struct async *as = reap_as(ps);
1850 if (as) {
1851 int retval = processcompl_compat(as, (void __user * __user *)arg);
1852 free_async(as);
1853 return retval;
1854 }
1855 if (signal_pending(current))
1856 return -EINTR;
1857 return -EIO;
1858}
1859
1860static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1861{
1862 int retval;
1863 struct async *as;
1864
1865 retval = -EAGAIN;
1866 as = async_getcompleted(ps);
1867 if (as) {
1868 retval = processcompl_compat(as, (void __user * __user *)arg);
1869 free_async(as);
1870 }
1871 return retval;
1872}
1873
1874
1875#endif
1876
1877static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1878{
1879 struct usbdevfs_disconnectsignal ds;
1880
1881 if (copy_from_user(&ds, arg, sizeof(ds)))
1882 return -EFAULT;
1883 ps->discsignr = ds.signr;
1884 ps->disccontext = ds.context;
1885 return 0;
1886}
1887
1888static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1889{
1890 unsigned int ifnum;
1891
1892 if (get_user(ifnum, (unsigned int __user *)arg))
1893 return -EFAULT;
1894 return claimintf(ps, ifnum);
1895}
1896
1897static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1898{
1899 unsigned int ifnum;
1900 int ret;
1901
1902 if (get_user(ifnum, (unsigned int __user *)arg))
1903 return -EFAULT;
1904 if ((ret = releaseintf(ps, ifnum)) < 0)
1905 return ret;
1906 destroy_async_on_interface (ps, ifnum);
1907 return 0;
1908}
1909
1910static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1911{
1912 int size;
1913 void *buf = NULL;
1914 int retval = 0;
1915 struct usb_interface *intf = NULL;
1916 struct usb_driver *driver = NULL;
1917
1918 /* alloc buffer */
1919 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1920 buf = kmalloc(size, GFP_KERNEL);
1921 if (buf == NULL)
1922 return -ENOMEM;
1923 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1924 if (copy_from_user(buf, ctl->data, size)) {
1925 kfree(buf);
1926 return -EFAULT;
1927 }
1928 } else {
1929 memset(buf, 0, size);
1930 }
1931 }
1932
1933 if (!connected(ps)) {
1934 kfree(buf);
1935 return -ENODEV;
1936 }
1937
1938 if (ps->dev->state != USB_STATE_CONFIGURED)
1939 retval = -EHOSTUNREACH;
1940 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1941 retval = -EINVAL;
1942 else switch (ctl->ioctl_code) {
1943
1944 /* disconnect kernel driver from interface */
1945 case USBDEVFS_DISCONNECT:
1946 if (intf->dev.driver) {
1947 driver = to_usb_driver(intf->dev.driver);
1948 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1949 usb_driver_release_interface(driver, intf);
1950 } else
1951 retval = -ENODATA;
1952 break;
1953
1954 /* let kernel drivers try to (re)bind to the interface */
1955 case USBDEVFS_CONNECT:
1956 if (!intf->dev.driver)
1957 retval = device_attach(&intf->dev);
1958 else
1959 retval = -EBUSY;
1960 break;
1961
1962 /* talk directly to the interface's driver */
1963 default:
1964 if (intf->dev.driver)
1965 driver = to_usb_driver(intf->dev.driver);
1966 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1967 retval = -ENOTTY;
1968 } else {
1969 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1970 if (retval == -ENOIOCTLCMD)
1971 retval = -ENOTTY;
1972 }
1973 }
1974
1975 /* cleanup and return */
1976 if (retval >= 0
1977 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1978 && size > 0
1979 && copy_to_user(ctl->data, buf, size) != 0)
1980 retval = -EFAULT;
1981
1982 kfree(buf);
1983 return retval;
1984}
1985
1986static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1987{
1988 struct usbdevfs_ioctl ctrl;
1989
1990 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1991 return -EFAULT;
1992 return proc_ioctl(ps, &ctrl);
1993}
1994
1995#ifdef CONFIG_COMPAT
1996static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
1997{
1998 struct usbdevfs_ioctl32 __user *uioc;
1999 struct usbdevfs_ioctl ctrl;
2000 u32 udata;
2001
2002 uioc = compat_ptr((long)arg);
2003 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2004 __get_user(ctrl.ifno, &uioc->ifno) ||
2005 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2006 __get_user(udata, &uioc->data))
2007 return -EFAULT;
2008 ctrl.data = compat_ptr(udata);
2009
2010 return proc_ioctl(ps, &ctrl);
2011}
2012#endif
2013
2014static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2015{
2016 unsigned portnum;
2017 int rc;
2018
2019 if (get_user(portnum, (unsigned __user *) arg))
2020 return -EFAULT;
2021 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2022 if (rc == 0)
2023 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2024 portnum, task_pid_nr(current), current->comm);
2025 return rc;
2026}
2027
2028static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2029{
2030 unsigned portnum;
2031
2032 if (get_user(portnum, (unsigned __user *) arg))
2033 return -EFAULT;
2034 return usb_hub_release_port(ps->dev, portnum, ps);
2035}
2036
2037static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2038{
2039 __u32 caps;
2040
2041 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
2042 if (!ps->dev->bus->no_stop_on_short)
2043 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2044 if (ps->dev->bus->sg_tablesize)
2045 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2046
2047 if (put_user(caps, (__u32 __user *)arg))
2048 return -EFAULT;
2049
2050 return 0;
2051}
2052
2053static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2054{
2055 struct usbdevfs_disconnect_claim dc;
2056 struct usb_interface *intf;
2057
2058 if (copy_from_user(&dc, arg, sizeof(dc)))
2059 return -EFAULT;
2060
2061 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2062 if (!intf)
2063 return -EINVAL;
2064
2065 if (intf->dev.driver) {
2066 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2067
2068 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2069 strncmp(dc.driver, intf->dev.driver->name,
2070 sizeof(dc.driver)) != 0)
2071 return -EBUSY;
2072
2073 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2074 strncmp(dc.driver, intf->dev.driver->name,
2075 sizeof(dc.driver)) == 0)
2076 return -EBUSY;
2077
2078 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2079 usb_driver_release_interface(driver, intf);
2080 }
2081
2082 return claimintf(ps, dc.interface);
2083}
2084
2085static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2086{
2087 unsigned num_streams, num_eps;
2088 struct usb_host_endpoint **eps;
2089 struct usb_interface *intf;
2090 int r;
2091
2092 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2093 &eps, &intf);
2094 if (r)
2095 return r;
2096
2097 destroy_async_on_interface(ps,
2098 intf->altsetting[0].desc.bInterfaceNumber);
2099
2100 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2101 kfree(eps);
2102 return r;
2103}
2104
2105static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2106{
2107 unsigned num_eps;
2108 struct usb_host_endpoint **eps;
2109 struct usb_interface *intf;
2110 int r;
2111
2112 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2113 if (r)
2114 return r;
2115
2116 destroy_async_on_interface(ps,
2117 intf->altsetting[0].desc.bInterfaceNumber);
2118
2119 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2120 kfree(eps);
2121 return r;
2122}
2123
2124/*
2125 * NOTE: All requests here that have interface numbers as parameters
2126 * are assuming that somehow the configuration has been prevented from
2127 * changing. But there's no mechanism to ensure that...
2128 */
2129static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2130 void __user *p)
2131{
2132 struct usb_dev_state *ps = file->private_data;
2133 struct inode *inode = file_inode(file);
2134 struct usb_device *dev = ps->dev;
2135 int ret = -ENOTTY;
2136
2137 if (!(file->f_mode & FMODE_WRITE))
2138 return -EPERM;
2139
2140 usb_lock_device(dev);
2141 if (!connected(ps)) {
2142 usb_unlock_device(dev);
2143 return -ENODEV;
2144 }
2145
2146 switch (cmd) {
2147 case USBDEVFS_CONTROL:
2148 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2149 ret = proc_control(ps, p);
2150 if (ret >= 0)
2151 inode->i_mtime = CURRENT_TIME;
2152 break;
2153
2154 case USBDEVFS_BULK:
2155 snoop(&dev->dev, "%s: BULK\n", __func__);
2156 ret = proc_bulk(ps, p);
2157 if (ret >= 0)
2158 inode->i_mtime = CURRENT_TIME;
2159 break;
2160
2161 case USBDEVFS_RESETEP:
2162 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2163 ret = proc_resetep(ps, p);
2164 if (ret >= 0)
2165 inode->i_mtime = CURRENT_TIME;
2166 break;
2167
2168 case USBDEVFS_RESET:
2169 snoop(&dev->dev, "%s: RESET\n", __func__);
2170 ret = proc_resetdevice(ps);
2171 break;
2172
2173 case USBDEVFS_CLEAR_HALT:
2174 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2175 ret = proc_clearhalt(ps, p);
2176 if (ret >= 0)
2177 inode->i_mtime = CURRENT_TIME;
2178 break;
2179
2180 case USBDEVFS_GETDRIVER:
2181 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2182 ret = proc_getdriver(ps, p);
2183 break;
2184
2185 case USBDEVFS_CONNECTINFO:
2186 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2187 ret = proc_connectinfo(ps, p);
2188 break;
2189
2190 case USBDEVFS_SETINTERFACE:
2191 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2192 ret = proc_setintf(ps, p);
2193 break;
2194
2195 case USBDEVFS_SETCONFIGURATION:
2196 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2197 ret = proc_setconfig(ps, p);
2198 break;
2199
2200 case USBDEVFS_SUBMITURB:
2201 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2202 ret = proc_submiturb(ps, p);
2203 if (ret >= 0)
2204 inode->i_mtime = CURRENT_TIME;
2205 break;
2206
2207#ifdef CONFIG_COMPAT
2208 case USBDEVFS_CONTROL32:
2209 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2210 ret = proc_control_compat(ps, p);
2211 if (ret >= 0)
2212 inode->i_mtime = CURRENT_TIME;
2213 break;
2214
2215 case USBDEVFS_BULK32:
2216 snoop(&dev->dev, "%s: BULK32\n", __func__);
2217 ret = proc_bulk_compat(ps, p);
2218 if (ret >= 0)
2219 inode->i_mtime = CURRENT_TIME;
2220 break;
2221
2222 case USBDEVFS_DISCSIGNAL32:
2223 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2224 ret = proc_disconnectsignal_compat(ps, p);
2225 break;
2226
2227 case USBDEVFS_SUBMITURB32:
2228 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2229 ret = proc_submiturb_compat(ps, p);
2230 if (ret >= 0)
2231 inode->i_mtime = CURRENT_TIME;
2232 break;
2233
2234 case USBDEVFS_REAPURB32:
2235 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2236 ret = proc_reapurb_compat(ps, p);
2237 break;
2238
2239 case USBDEVFS_REAPURBNDELAY32:
2240 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2241 ret = proc_reapurbnonblock_compat(ps, p);
2242 break;
2243
2244 case USBDEVFS_IOCTL32:
2245 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2246 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2247 break;
2248#endif
2249
2250 case USBDEVFS_DISCARDURB:
2251 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2252 ret = proc_unlinkurb(ps, p);
2253 break;
2254
2255 case USBDEVFS_REAPURB:
2256 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2257 ret = proc_reapurb(ps, p);
2258 break;
2259
2260 case USBDEVFS_REAPURBNDELAY:
2261 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2262 ret = proc_reapurbnonblock(ps, p);
2263 break;
2264
2265 case USBDEVFS_DISCSIGNAL:
2266 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2267 ret = proc_disconnectsignal(ps, p);
2268 break;
2269
2270 case USBDEVFS_CLAIMINTERFACE:
2271 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2272 ret = proc_claiminterface(ps, p);
2273 break;
2274
2275 case USBDEVFS_RELEASEINTERFACE:
2276 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2277 ret = proc_releaseinterface(ps, p);
2278 break;
2279
2280 case USBDEVFS_IOCTL:
2281 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2282 ret = proc_ioctl_default(ps, p);
2283 break;
2284
2285 case USBDEVFS_CLAIM_PORT:
2286 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2287 ret = proc_claim_port(ps, p);
2288 break;
2289
2290 case USBDEVFS_RELEASE_PORT:
2291 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2292 ret = proc_release_port(ps, p);
2293 break;
2294 case USBDEVFS_GET_CAPABILITIES:
2295 ret = proc_get_capabilities(ps, p);
2296 break;
2297 case USBDEVFS_DISCONNECT_CLAIM:
2298 ret = proc_disconnect_claim(ps, p);
2299 break;
2300 case USBDEVFS_ALLOC_STREAMS:
2301 ret = proc_alloc_streams(ps, p);
2302 break;
2303 case USBDEVFS_FREE_STREAMS:
2304 ret = proc_free_streams(ps, p);
2305 break;
2306 }
2307 usb_unlock_device(dev);
2308 if (ret >= 0)
2309 inode->i_atime = CURRENT_TIME;
2310 return ret;
2311}
2312
2313static long usbdev_ioctl(struct file *file, unsigned int cmd,
2314 unsigned long arg)
2315{
2316 int ret;
2317
2318 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2319
2320 return ret;
2321}
2322
2323#ifdef CONFIG_COMPAT
2324static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2325 unsigned long arg)
2326{
2327 int ret;
2328
2329 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2330
2331 return ret;
2332}
2333#endif
2334
2335/* No kernel lock - fine */
2336static unsigned int usbdev_poll(struct file *file,
2337 struct poll_table_struct *wait)
2338{
2339 struct usb_dev_state *ps = file->private_data;
2340 unsigned int mask = 0;
2341
2342 poll_wait(file, &ps->wait, wait);
2343 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2344 mask |= POLLOUT | POLLWRNORM;
2345 if (!connected(ps))
2346 mask |= POLLERR | POLLHUP;
2347 return mask;
2348}
2349
2350const struct file_operations usbdev_file_operations = {
2351 .owner = THIS_MODULE,
2352 .llseek = usbdev_lseek,
2353 .read = usbdev_read,
2354 .poll = usbdev_poll,
2355 .unlocked_ioctl = usbdev_ioctl,
2356#ifdef CONFIG_COMPAT
2357 .compat_ioctl = usbdev_compat_ioctl,
2358#endif
2359 .open = usbdev_open,
2360 .release = usbdev_release,
2361};
2362
2363static void usbdev_remove(struct usb_device *udev)
2364{
2365 struct usb_dev_state *ps;
2366 struct siginfo sinfo;
2367
2368 while (!list_empty(&udev->filelist)) {
2369 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2370 destroy_all_async(ps);
2371 wake_up_all(&ps->wait);
2372 list_del_init(&ps->list);
2373 if (ps->discsignr) {
2374 sinfo.si_signo = ps->discsignr;
2375 sinfo.si_errno = EPIPE;
2376 sinfo.si_code = SI_ASYNCIO;
2377 sinfo.si_addr = ps->disccontext;
2378 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2379 ps->disc_pid, ps->cred, ps->secid);
2380 }
2381 }
2382}
2383
2384static int usbdev_notify(struct notifier_block *self,
2385 unsigned long action, void *dev)
2386{
2387 switch (action) {
2388 case USB_DEVICE_ADD:
2389 break;
2390 case USB_DEVICE_REMOVE:
2391 usbdev_remove(dev);
2392 break;
2393 }
2394 return NOTIFY_OK;
2395}
2396
2397static struct notifier_block usbdev_nb = {
2398 .notifier_call = usbdev_notify,
2399};
2400
2401static struct cdev usb_device_cdev;
2402
2403int __init usb_devio_init(void)
2404{
2405 int retval;
2406
2407 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2408 "usb_device");
2409 if (retval) {
2410 printk(KERN_ERR "Unable to register minors for usb_device\n");
2411 goto out;
2412 }
2413 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2414 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2415 if (retval) {
2416 printk(KERN_ERR "Unable to get usb_device major %d\n",
2417 USB_DEVICE_MAJOR);
2418 goto error_cdev;
2419 }
2420 usb_register_notify(&usbdev_nb);
2421out:
2422 return retval;
2423
2424error_cdev:
2425 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2426 goto out;
2427}
2428
2429void usb_devio_cleanup(void)
2430{
2431 usb_unregister_notify(&usbdev_nb);
2432 cdev_del(&usb_device_cdev);
2433 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2434}