Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22/*****************************************************************************/
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched/signal.h>
27#include <linux/slab.h>
28#include <linux/signal.h>
29#include <linux/poll.h>
30#include <linux/module.h>
31#include <linux/string.h>
32#include <linux/usb.h>
33#include <linux/usbdevice_fs.h>
34#include <linux/usb/hcd.h> /* for usbcore internals */
35#include <linux/cdev.h>
36#include <linux/notifier.h>
37#include <linux/security.h>
38#include <linux/user_namespace.h>
39#include <linux/scatterlist.h>
40#include <linux/uaccess.h>
41#include <linux/dma-mapping.h>
42#include <asm/byteorder.h>
43#include <linux/moduleparam.h>
44
45#include "usb.h"
46
47#ifdef CONFIG_PM
48#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
49#else
50#define MAYBE_CAP_SUSPEND 0
51#endif
52
53#define USB_MAXBUS 64
54#define USB_DEVICE_MAX (USB_MAXBUS * 128)
55#define USB_SG_SIZE 16384 /* split-size for large txs */
56
57/* Mutual exclusion for ps->list in resume vs. release and remove */
58static DEFINE_MUTEX(usbfs_mutex);
59
60struct usb_dev_state {
61 struct list_head list; /* state list */
62 struct usb_device *dev;
63 struct file *file;
64 spinlock_t lock; /* protects the async urb lists */
65 struct list_head async_pending;
66 struct list_head async_completed;
67 struct list_head memory_list;
68 wait_queue_head_t wait; /* wake up if a request completed */
69 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 const struct cred *cred;
73 sigval_t disccontext;
74 unsigned long ifclaimed;
75 u32 disabled_bulk_eps;
76 unsigned long interface_allowed_mask;
77 int not_yet_resumed;
78 bool suspend_allowed;
79 bool privileges_dropped;
80};
81
82struct usb_memory {
83 struct list_head memlist;
84 int vma_use_count;
85 int urb_use_count;
86 u32 size;
87 void *mem;
88 dma_addr_t dma_handle;
89 unsigned long vm_start;
90 struct usb_dev_state *ps;
91};
92
93struct async {
94 struct list_head asynclist;
95 struct usb_dev_state *ps;
96 struct pid *pid;
97 const struct cred *cred;
98 unsigned int signr;
99 unsigned int ifnum;
100 void __user *userbuffer;
101 void __user *userurb;
102 sigval_t userurb_sigval;
103 struct urb *urb;
104 struct usb_memory *usbm;
105 unsigned int mem_usage;
106 int status;
107 u8 bulk_addr;
108 u8 bulk_status;
109};
110
111static bool usbfs_snoop;
112module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
113MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
114
115static unsigned usbfs_snoop_max = 65536;
116module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
117MODULE_PARM_DESC(usbfs_snoop_max,
118 "maximum number of bytes to print while snooping");
119
120#define snoop(dev, format, arg...) \
121 do { \
122 if (usbfs_snoop) \
123 dev_info(dev, format, ## arg); \
124 } while (0)
125
126enum snoop_when {
127 SUBMIT, COMPLETE
128};
129
130#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
131
132/* Limit on the total amount of memory we can allocate for transfers */
133static u32 usbfs_memory_mb = 16;
134module_param(usbfs_memory_mb, uint, 0644);
135MODULE_PARM_DESC(usbfs_memory_mb,
136 "maximum MB allowed for usbfs buffers (0 = no limit)");
137
138/* Hard limit, necessary to avoid arithmetic overflow */
139#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
140
141static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
142
143/* Check whether it's okay to allocate more memory for a transfer */
144static int usbfs_increase_memory_usage(u64 amount)
145{
146 u64 lim;
147
148 lim = READ_ONCE(usbfs_memory_mb);
149 lim <<= 20;
150
151 atomic64_add(amount, &usbfs_memory_usage);
152
153 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
154 atomic64_sub(amount, &usbfs_memory_usage);
155 return -ENOMEM;
156 }
157
158 return 0;
159}
160
161/* Memory for a transfer is being deallocated */
162static void usbfs_decrease_memory_usage(u64 amount)
163{
164 atomic64_sub(amount, &usbfs_memory_usage);
165}
166
167static int connected(struct usb_dev_state *ps)
168{
169 return (!list_empty(&ps->list) &&
170 ps->dev->state != USB_STATE_NOTATTACHED);
171}
172
173static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
174{
175 struct usb_dev_state *ps = usbm->ps;
176 unsigned long flags;
177
178 spin_lock_irqsave(&ps->lock, flags);
179 --*count;
180 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
181 list_del(&usbm->memlist);
182 spin_unlock_irqrestore(&ps->lock, flags);
183
184 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
185 usbm->dma_handle);
186 usbfs_decrease_memory_usage(
187 usbm->size + sizeof(struct usb_memory));
188 kfree(usbm);
189 } else {
190 spin_unlock_irqrestore(&ps->lock, flags);
191 }
192}
193
194static void usbdev_vm_open(struct vm_area_struct *vma)
195{
196 struct usb_memory *usbm = vma->vm_private_data;
197 unsigned long flags;
198
199 spin_lock_irqsave(&usbm->ps->lock, flags);
200 ++usbm->vma_use_count;
201 spin_unlock_irqrestore(&usbm->ps->lock, flags);
202}
203
204static void usbdev_vm_close(struct vm_area_struct *vma)
205{
206 struct usb_memory *usbm = vma->vm_private_data;
207
208 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
209}
210
211static const struct vm_operations_struct usbdev_vm_ops = {
212 .open = usbdev_vm_open,
213 .close = usbdev_vm_close
214};
215
216static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
217{
218 struct usb_memory *usbm = NULL;
219 struct usb_dev_state *ps = file->private_data;
220 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
221 size_t size = vma->vm_end - vma->vm_start;
222 void *mem;
223 unsigned long flags;
224 dma_addr_t dma_handle;
225 int ret;
226
227 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
228 if (ret)
229 goto error;
230
231 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
232 if (!usbm) {
233 ret = -ENOMEM;
234 goto error_decrease_mem;
235 }
236
237 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
238 &dma_handle);
239 if (!mem) {
240 ret = -ENOMEM;
241 goto error_free_usbm;
242 }
243
244 memset(mem, 0, size);
245
246 usbm->mem = mem;
247 usbm->dma_handle = dma_handle;
248 usbm->size = size;
249 usbm->ps = ps;
250 usbm->vm_start = vma->vm_start;
251 usbm->vma_use_count = 1;
252 INIT_LIST_HEAD(&usbm->memlist);
253
254 if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
255 if (remap_pfn_range(vma, vma->vm_start,
256 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
257 size, vma->vm_page_prot) < 0) {
258 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
259 return -EAGAIN;
260 }
261 } else {
262 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
263 size)) {
264 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
265 return -EAGAIN;
266 }
267 }
268
269 vma->vm_flags |= VM_IO;
270 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
271 vma->vm_ops = &usbdev_vm_ops;
272 vma->vm_private_data = usbm;
273
274 spin_lock_irqsave(&ps->lock, flags);
275 list_add_tail(&usbm->memlist, &ps->memory_list);
276 spin_unlock_irqrestore(&ps->lock, flags);
277
278 return 0;
279
280error_free_usbm:
281 kfree(usbm);
282error_decrease_mem:
283 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
284error:
285 return ret;
286}
287
288static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
289 loff_t *ppos)
290{
291 struct usb_dev_state *ps = file->private_data;
292 struct usb_device *dev = ps->dev;
293 ssize_t ret = 0;
294 unsigned len;
295 loff_t pos;
296 int i;
297
298 pos = *ppos;
299 usb_lock_device(dev);
300 if (!connected(ps)) {
301 ret = -ENODEV;
302 goto err;
303 } else if (pos < 0) {
304 ret = -EINVAL;
305 goto err;
306 }
307
308 if (pos < sizeof(struct usb_device_descriptor)) {
309 /* 18 bytes - fits on the stack */
310 struct usb_device_descriptor temp_desc;
311
312 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
313 le16_to_cpus(&temp_desc.bcdUSB);
314 le16_to_cpus(&temp_desc.idVendor);
315 le16_to_cpus(&temp_desc.idProduct);
316 le16_to_cpus(&temp_desc.bcdDevice);
317
318 len = sizeof(struct usb_device_descriptor) - pos;
319 if (len > nbytes)
320 len = nbytes;
321 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
322 ret = -EFAULT;
323 goto err;
324 }
325
326 *ppos += len;
327 buf += len;
328 nbytes -= len;
329 ret += len;
330 }
331
332 pos = sizeof(struct usb_device_descriptor);
333 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
334 struct usb_config_descriptor *config =
335 (struct usb_config_descriptor *)dev->rawdescriptors[i];
336 unsigned int length = le16_to_cpu(config->wTotalLength);
337
338 if (*ppos < pos + length) {
339
340 /* The descriptor may claim to be longer than it
341 * really is. Here is the actual allocated length. */
342 unsigned alloclen =
343 le16_to_cpu(dev->config[i].desc.wTotalLength);
344
345 len = length - (*ppos - pos);
346 if (len > nbytes)
347 len = nbytes;
348
349 /* Simply don't write (skip over) unallocated parts */
350 if (alloclen > (*ppos - pos)) {
351 alloclen -= (*ppos - pos);
352 if (copy_to_user(buf,
353 dev->rawdescriptors[i] + (*ppos - pos),
354 min(len, alloclen))) {
355 ret = -EFAULT;
356 goto err;
357 }
358 }
359
360 *ppos += len;
361 buf += len;
362 nbytes -= len;
363 ret += len;
364 }
365
366 pos += length;
367 }
368
369err:
370 usb_unlock_device(dev);
371 return ret;
372}
373
374/*
375 * async list handling
376 */
377
378static struct async *alloc_async(unsigned int numisoframes)
379{
380 struct async *as;
381
382 as = kzalloc(sizeof(struct async), GFP_KERNEL);
383 if (!as)
384 return NULL;
385 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
386 if (!as->urb) {
387 kfree(as);
388 return NULL;
389 }
390 return as;
391}
392
393static void free_async(struct async *as)
394{
395 int i;
396
397 put_pid(as->pid);
398 if (as->cred)
399 put_cred(as->cred);
400 for (i = 0; i < as->urb->num_sgs; i++) {
401 if (sg_page(&as->urb->sg[i]))
402 kfree(sg_virt(&as->urb->sg[i]));
403 }
404
405 kfree(as->urb->sg);
406 if (as->usbm == NULL)
407 kfree(as->urb->transfer_buffer);
408 else
409 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
410
411 kfree(as->urb->setup_packet);
412 usb_free_urb(as->urb);
413 usbfs_decrease_memory_usage(as->mem_usage);
414 kfree(as);
415}
416
417static void async_newpending(struct async *as)
418{
419 struct usb_dev_state *ps = as->ps;
420 unsigned long flags;
421
422 spin_lock_irqsave(&ps->lock, flags);
423 list_add_tail(&as->asynclist, &ps->async_pending);
424 spin_unlock_irqrestore(&ps->lock, flags);
425}
426
427static void async_removepending(struct async *as)
428{
429 struct usb_dev_state *ps = as->ps;
430 unsigned long flags;
431
432 spin_lock_irqsave(&ps->lock, flags);
433 list_del_init(&as->asynclist);
434 spin_unlock_irqrestore(&ps->lock, flags);
435}
436
437static struct async *async_getcompleted(struct usb_dev_state *ps)
438{
439 unsigned long flags;
440 struct async *as = NULL;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 if (!list_empty(&ps->async_completed)) {
444 as = list_entry(ps->async_completed.next, struct async,
445 asynclist);
446 list_del_init(&as->asynclist);
447 }
448 spin_unlock_irqrestore(&ps->lock, flags);
449 return as;
450}
451
452static struct async *async_getpending(struct usb_dev_state *ps,
453 void __user *userurb)
454{
455 struct async *as;
456
457 list_for_each_entry(as, &ps->async_pending, asynclist)
458 if (as->userurb == userurb) {
459 list_del_init(&as->asynclist);
460 return as;
461 }
462
463 return NULL;
464}
465
466static void snoop_urb(struct usb_device *udev,
467 void __user *userurb, int pipe, unsigned length,
468 int timeout_or_status, enum snoop_when when,
469 unsigned char *data, unsigned data_len)
470{
471 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
472 static const char *dirs[] = {"out", "in"};
473 int ep;
474 const char *t, *d;
475
476 if (!usbfs_snoop)
477 return;
478
479 ep = usb_pipeendpoint(pipe);
480 t = types[usb_pipetype(pipe)];
481 d = dirs[!!usb_pipein(pipe)];
482
483 if (userurb) { /* Async */
484 if (when == SUBMIT)
485 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
486 "length %u\n",
487 userurb, ep, t, d, length);
488 else
489 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
490 "actual_length %u status %d\n",
491 userurb, ep, t, d, length,
492 timeout_or_status);
493 } else {
494 if (when == SUBMIT)
495 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
496 "timeout %d\n",
497 ep, t, d, length, timeout_or_status);
498 else
499 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
500 "status %d\n",
501 ep, t, d, length, timeout_or_status);
502 }
503
504 data_len = min(data_len, usbfs_snoop_max);
505 if (data && data_len > 0) {
506 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
507 data, data_len, 1);
508 }
509}
510
511static void snoop_urb_data(struct urb *urb, unsigned len)
512{
513 int i, size;
514
515 len = min(len, usbfs_snoop_max);
516 if (!usbfs_snoop || len == 0)
517 return;
518
519 if (urb->num_sgs == 0) {
520 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
521 urb->transfer_buffer, len, 1);
522 return;
523 }
524
525 for (i = 0; i < urb->num_sgs && len; i++) {
526 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
527 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
528 sg_virt(&urb->sg[i]), size, 1);
529 len -= size;
530 }
531}
532
533static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
534{
535 unsigned i, len, size;
536
537 if (urb->number_of_packets > 0) /* Isochronous */
538 len = urb->transfer_buffer_length;
539 else /* Non-Isoc */
540 len = urb->actual_length;
541
542 if (urb->num_sgs == 0) {
543 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
544 return -EFAULT;
545 return 0;
546 }
547
548 for (i = 0; i < urb->num_sgs && len; i++) {
549 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
551 return -EFAULT;
552 userbuffer += size;
553 len -= size;
554 }
555
556 return 0;
557}
558
559#define AS_CONTINUATION 1
560#define AS_UNLINK 2
561
562static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
563__releases(ps->lock)
564__acquires(ps->lock)
565{
566 struct urb *urb;
567 struct async *as;
568
569 /* Mark all the pending URBs that match bulk_addr, up to but not
570 * including the first one without AS_CONTINUATION. If such an
571 * URB is encountered then a new transfer has already started so
572 * the endpoint doesn't need to be disabled; otherwise it does.
573 */
574 list_for_each_entry(as, &ps->async_pending, asynclist) {
575 if (as->bulk_addr == bulk_addr) {
576 if (as->bulk_status != AS_CONTINUATION)
577 goto rescan;
578 as->bulk_status = AS_UNLINK;
579 as->bulk_addr = 0;
580 }
581 }
582 ps->disabled_bulk_eps |= (1 << bulk_addr);
583
584 /* Now carefully unlink all the marked pending URBs */
585 rescan:
586 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
587 if (as->bulk_status == AS_UNLINK) {
588 as->bulk_status = 0; /* Only once */
589 urb = as->urb;
590 usb_get_urb(urb);
591 spin_unlock(&ps->lock); /* Allow completions */
592 usb_unlink_urb(urb);
593 usb_put_urb(urb);
594 spin_lock(&ps->lock);
595 goto rescan;
596 }
597 }
598}
599
600static void async_completed(struct urb *urb)
601{
602 struct async *as = urb->context;
603 struct usb_dev_state *ps = as->ps;
604 struct pid *pid = NULL;
605 const struct cred *cred = NULL;
606 unsigned long flags;
607 sigval_t addr;
608 int signr, errno;
609
610 spin_lock_irqsave(&ps->lock, flags);
611 list_move_tail(&as->asynclist, &ps->async_completed);
612 as->status = urb->status;
613 signr = as->signr;
614 if (signr) {
615 errno = as->status;
616 addr = as->userurb_sigval;
617 pid = get_pid(as->pid);
618 cred = get_cred(as->cred);
619 }
620 snoop(&urb->dev->dev, "urb complete\n");
621 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
622 as->status, COMPLETE, NULL, 0);
623 if (usb_urb_dir_in(urb))
624 snoop_urb_data(urb, urb->actual_length);
625
626 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
627 as->status != -ENOENT)
628 cancel_bulk_urbs(ps, as->bulk_addr);
629
630 wake_up(&ps->wait);
631 spin_unlock_irqrestore(&ps->lock, flags);
632
633 if (signr) {
634 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
635 put_pid(pid);
636 put_cred(cred);
637 }
638}
639
640static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
641{
642 struct urb *urb;
643 struct async *as;
644 unsigned long flags;
645
646 spin_lock_irqsave(&ps->lock, flags);
647 while (!list_empty(list)) {
648 as = list_last_entry(list, struct async, asynclist);
649 list_del_init(&as->asynclist);
650 urb = as->urb;
651 usb_get_urb(urb);
652
653 /* drop the spinlock so the completion handler can run */
654 spin_unlock_irqrestore(&ps->lock, flags);
655 usb_kill_urb(urb);
656 usb_put_urb(urb);
657 spin_lock_irqsave(&ps->lock, flags);
658 }
659 spin_unlock_irqrestore(&ps->lock, flags);
660}
661
662static void destroy_async_on_interface(struct usb_dev_state *ps,
663 unsigned int ifnum)
664{
665 struct list_head *p, *q, hitlist;
666 unsigned long flags;
667
668 INIT_LIST_HEAD(&hitlist);
669 spin_lock_irqsave(&ps->lock, flags);
670 list_for_each_safe(p, q, &ps->async_pending)
671 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
672 list_move_tail(p, &hitlist);
673 spin_unlock_irqrestore(&ps->lock, flags);
674 destroy_async(ps, &hitlist);
675}
676
677static void destroy_all_async(struct usb_dev_state *ps)
678{
679 destroy_async(ps, &ps->async_pending);
680}
681
682/*
683 * interface claims are made only at the request of user level code,
684 * which can also release them (explicitly or by closing files).
685 * they're also undone when devices disconnect.
686 */
687
688static int driver_probe(struct usb_interface *intf,
689 const struct usb_device_id *id)
690{
691 return -ENODEV;
692}
693
694static void driver_disconnect(struct usb_interface *intf)
695{
696 struct usb_dev_state *ps = usb_get_intfdata(intf);
697 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
698
699 if (!ps)
700 return;
701
702 /* NOTE: this relies on usbcore having canceled and completed
703 * all pending I/O requests; 2.6 does that.
704 */
705
706 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
707 clear_bit(ifnum, &ps->ifclaimed);
708 else
709 dev_warn(&intf->dev, "interface number %u out of range\n",
710 ifnum);
711
712 usb_set_intfdata(intf, NULL);
713
714 /* force async requests to complete */
715 destroy_async_on_interface(ps, ifnum);
716}
717
718/* We don't care about suspend/resume of claimed interfaces */
719static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
720{
721 return 0;
722}
723
724static int driver_resume(struct usb_interface *intf)
725{
726 return 0;
727}
728
729/* The following routines apply to the entire device, not interfaces */
730void usbfs_notify_suspend(struct usb_device *udev)
731{
732 /* We don't need to handle this */
733}
734
735void usbfs_notify_resume(struct usb_device *udev)
736{
737 struct usb_dev_state *ps;
738
739 /* Protect against simultaneous remove or release */
740 mutex_lock(&usbfs_mutex);
741 list_for_each_entry(ps, &udev->filelist, list) {
742 WRITE_ONCE(ps->not_yet_resumed, 0);
743 wake_up_all(&ps->wait_for_resume);
744 }
745 mutex_unlock(&usbfs_mutex);
746}
747
748struct usb_driver usbfs_driver = {
749 .name = "usbfs",
750 .probe = driver_probe,
751 .disconnect = driver_disconnect,
752 .suspend = driver_suspend,
753 .resume = driver_resume,
754 .supports_autosuspend = 1,
755};
756
757static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
758{
759 struct usb_device *dev = ps->dev;
760 struct usb_interface *intf;
761 int err;
762
763 if (ifnum >= 8*sizeof(ps->ifclaimed))
764 return -EINVAL;
765 /* already claimed */
766 if (test_bit(ifnum, &ps->ifclaimed))
767 return 0;
768
769 if (ps->privileges_dropped &&
770 !test_bit(ifnum, &ps->interface_allowed_mask))
771 return -EACCES;
772
773 intf = usb_ifnum_to_if(dev, ifnum);
774 if (!intf)
775 err = -ENOENT;
776 else {
777 unsigned int old_suppress;
778
779 /* suppress uevents while claiming interface */
780 old_suppress = dev_get_uevent_suppress(&intf->dev);
781 dev_set_uevent_suppress(&intf->dev, 1);
782 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
783 dev_set_uevent_suppress(&intf->dev, old_suppress);
784 }
785 if (err == 0)
786 set_bit(ifnum, &ps->ifclaimed);
787 return err;
788}
789
790static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
791{
792 struct usb_device *dev;
793 struct usb_interface *intf;
794 int err;
795
796 err = -EINVAL;
797 if (ifnum >= 8*sizeof(ps->ifclaimed))
798 return err;
799 dev = ps->dev;
800 intf = usb_ifnum_to_if(dev, ifnum);
801 if (!intf)
802 err = -ENOENT;
803 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
804 unsigned int old_suppress;
805
806 /* suppress uevents while releasing interface */
807 old_suppress = dev_get_uevent_suppress(&intf->dev);
808 dev_set_uevent_suppress(&intf->dev, 1);
809 usb_driver_release_interface(&usbfs_driver, intf);
810 dev_set_uevent_suppress(&intf->dev, old_suppress);
811 err = 0;
812 }
813 return err;
814}
815
816static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
817{
818 if (ps->dev->state != USB_STATE_CONFIGURED)
819 return -EHOSTUNREACH;
820 if (ifnum >= 8*sizeof(ps->ifclaimed))
821 return -EINVAL;
822 if (test_bit(ifnum, &ps->ifclaimed))
823 return 0;
824 /* if not yet claimed, claim it for the driver */
825 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
826 "interface %u before use\n", task_pid_nr(current),
827 current->comm, ifnum);
828 return claimintf(ps, ifnum);
829}
830
831static int findintfep(struct usb_device *dev, unsigned int ep)
832{
833 unsigned int i, j, e;
834 struct usb_interface *intf;
835 struct usb_host_interface *alts;
836 struct usb_endpoint_descriptor *endpt;
837
838 if (ep & ~(USB_DIR_IN|0xf))
839 return -EINVAL;
840 if (!dev->actconfig)
841 return -ESRCH;
842 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
843 intf = dev->actconfig->interface[i];
844 for (j = 0; j < intf->num_altsetting; j++) {
845 alts = &intf->altsetting[j];
846 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
847 endpt = &alts->endpoint[e].desc;
848 if (endpt->bEndpointAddress == ep)
849 return alts->desc.bInterfaceNumber;
850 }
851 }
852 }
853 return -ENOENT;
854}
855
856static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
857 unsigned int request, unsigned int index)
858{
859 int ret = 0;
860 struct usb_host_interface *alt_setting;
861
862 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
863 && ps->dev->state != USB_STATE_ADDRESS
864 && ps->dev->state != USB_STATE_CONFIGURED)
865 return -EHOSTUNREACH;
866 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
867 return 0;
868
869 /*
870 * check for the special corner case 'get_device_id' in the printer
871 * class specification, which we always want to allow as it is used
872 * to query things like ink level, etc.
873 */
874 if (requesttype == 0xa1 && request == 0) {
875 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
876 index >> 8, index & 0xff);
877 if (alt_setting
878 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
879 return 0;
880 }
881
882 index &= 0xff;
883 switch (requesttype & USB_RECIP_MASK) {
884 case USB_RECIP_ENDPOINT:
885 if ((index & ~USB_DIR_IN) == 0)
886 return 0;
887 ret = findintfep(ps->dev, index);
888 if (ret < 0) {
889 /*
890 * Some not fully compliant Win apps seem to get
891 * index wrong and have the endpoint number here
892 * rather than the endpoint address (with the
893 * correct direction). Win does let this through,
894 * so we'll not reject it here but leave it to
895 * the device to not break KVM. But we warn.
896 */
897 ret = findintfep(ps->dev, index ^ 0x80);
898 if (ret >= 0)
899 dev_info(&ps->dev->dev,
900 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
901 __func__, task_pid_nr(current),
902 current->comm, index, index ^ 0x80);
903 }
904 if (ret >= 0)
905 ret = checkintf(ps, ret);
906 break;
907
908 case USB_RECIP_INTERFACE:
909 ret = checkintf(ps, index);
910 break;
911 }
912 return ret;
913}
914
915static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
916 unsigned char ep)
917{
918 if (ep & USB_ENDPOINT_DIR_MASK)
919 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
920 else
921 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
922}
923
924static int parse_usbdevfs_streams(struct usb_dev_state *ps,
925 struct usbdevfs_streams __user *streams,
926 unsigned int *num_streams_ret,
927 unsigned int *num_eps_ret,
928 struct usb_host_endpoint ***eps_ret,
929 struct usb_interface **intf_ret)
930{
931 unsigned int i, num_streams, num_eps;
932 struct usb_host_endpoint **eps;
933 struct usb_interface *intf = NULL;
934 unsigned char ep;
935 int ifnum, ret;
936
937 if (get_user(num_streams, &streams->num_streams) ||
938 get_user(num_eps, &streams->num_eps))
939 return -EFAULT;
940
941 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
942 return -EINVAL;
943
944 /* The XHCI controller allows max 2 ^ 16 streams */
945 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
946 return -EINVAL;
947
948 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
949 if (!eps)
950 return -ENOMEM;
951
952 for (i = 0; i < num_eps; i++) {
953 if (get_user(ep, &streams->eps[i])) {
954 ret = -EFAULT;
955 goto error;
956 }
957 eps[i] = ep_to_host_endpoint(ps->dev, ep);
958 if (!eps[i]) {
959 ret = -EINVAL;
960 goto error;
961 }
962
963 /* usb_alloc/free_streams operate on an usb_interface */
964 ifnum = findintfep(ps->dev, ep);
965 if (ifnum < 0) {
966 ret = ifnum;
967 goto error;
968 }
969
970 if (i == 0) {
971 ret = checkintf(ps, ifnum);
972 if (ret < 0)
973 goto error;
974 intf = usb_ifnum_to_if(ps->dev, ifnum);
975 } else {
976 /* Verify all eps belong to the same interface */
977 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
978 ret = -EINVAL;
979 goto error;
980 }
981 }
982 }
983
984 if (num_streams_ret)
985 *num_streams_ret = num_streams;
986 *num_eps_ret = num_eps;
987 *eps_ret = eps;
988 *intf_ret = intf;
989
990 return 0;
991
992error:
993 kfree(eps);
994 return ret;
995}
996
997static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
998{
999 struct device *dev;
1000
1001 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1002 if (!dev)
1003 return NULL;
1004 return to_usb_device(dev);
1005}
1006
1007/*
1008 * file operations
1009 */
1010static int usbdev_open(struct inode *inode, struct file *file)
1011{
1012 struct usb_device *dev = NULL;
1013 struct usb_dev_state *ps;
1014 int ret;
1015
1016 ret = -ENOMEM;
1017 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1018 if (!ps)
1019 goto out_free_ps;
1020
1021 ret = -ENODEV;
1022
1023 /* usbdev device-node */
1024 if (imajor(inode) == USB_DEVICE_MAJOR)
1025 dev = usbdev_lookup_by_devt(inode->i_rdev);
1026 if (!dev)
1027 goto out_free_ps;
1028
1029 usb_lock_device(dev);
1030 if (dev->state == USB_STATE_NOTATTACHED)
1031 goto out_unlock_device;
1032
1033 ret = usb_autoresume_device(dev);
1034 if (ret)
1035 goto out_unlock_device;
1036
1037 ps->dev = dev;
1038 ps->file = file;
1039 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1040 spin_lock_init(&ps->lock);
1041 INIT_LIST_HEAD(&ps->list);
1042 INIT_LIST_HEAD(&ps->async_pending);
1043 INIT_LIST_HEAD(&ps->async_completed);
1044 INIT_LIST_HEAD(&ps->memory_list);
1045 init_waitqueue_head(&ps->wait);
1046 init_waitqueue_head(&ps->wait_for_resume);
1047 ps->disc_pid = get_pid(task_pid(current));
1048 ps->cred = get_current_cred();
1049 smp_wmb();
1050
1051 /* Can't race with resume; the device is already active */
1052 list_add_tail(&ps->list, &dev->filelist);
1053 file->private_data = ps;
1054 usb_unlock_device(dev);
1055 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1056 current->comm);
1057 return ret;
1058
1059 out_unlock_device:
1060 usb_unlock_device(dev);
1061 usb_put_dev(dev);
1062 out_free_ps:
1063 kfree(ps);
1064 return ret;
1065}
1066
1067static int usbdev_release(struct inode *inode, struct file *file)
1068{
1069 struct usb_dev_state *ps = file->private_data;
1070 struct usb_device *dev = ps->dev;
1071 unsigned int ifnum;
1072 struct async *as;
1073
1074 usb_lock_device(dev);
1075 usb_hub_release_all_ports(dev, ps);
1076
1077 /* Protect against simultaneous resume */
1078 mutex_lock(&usbfs_mutex);
1079 list_del_init(&ps->list);
1080 mutex_unlock(&usbfs_mutex);
1081
1082 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1083 ifnum++) {
1084 if (test_bit(ifnum, &ps->ifclaimed))
1085 releaseintf(ps, ifnum);
1086 }
1087 destroy_all_async(ps);
1088 if (!ps->suspend_allowed)
1089 usb_autosuspend_device(dev);
1090 usb_unlock_device(dev);
1091 usb_put_dev(dev);
1092 put_pid(ps->disc_pid);
1093 put_cred(ps->cred);
1094
1095 as = async_getcompleted(ps);
1096 while (as) {
1097 free_async(as);
1098 as = async_getcompleted(ps);
1099 }
1100
1101 kfree(ps);
1102 return 0;
1103}
1104
1105static int do_proc_control(struct usb_dev_state *ps,
1106 struct usbdevfs_ctrltransfer *ctrl)
1107{
1108 struct usb_device *dev = ps->dev;
1109 unsigned int tmo;
1110 unsigned char *tbuf;
1111 unsigned wLength;
1112 int i, pipe, ret;
1113
1114 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1115 ctrl->wIndex);
1116 if (ret)
1117 return ret;
1118 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1119 if (wLength > PAGE_SIZE)
1120 return -EINVAL;
1121 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1122 sizeof(struct usb_ctrlrequest));
1123 if (ret)
1124 return ret;
1125 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1126 if (!tbuf) {
1127 ret = -ENOMEM;
1128 goto done;
1129 }
1130 tmo = ctrl->timeout;
1131 snoop(&dev->dev, "control urb: bRequestType=%02x "
1132 "bRequest=%02x wValue=%04x "
1133 "wIndex=%04x wLength=%04x\n",
1134 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1135 ctrl->wIndex, ctrl->wLength);
1136 if (ctrl->bRequestType & 0x80) {
1137 pipe = usb_rcvctrlpipe(dev, 0);
1138 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0);
1139
1140 usb_unlock_device(dev);
1141 i = usb_control_msg(dev, pipe, ctrl->bRequest,
1142 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1143 tbuf, ctrl->wLength, tmo);
1144 usb_lock_device(dev);
1145 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1146 tbuf, max(i, 0));
1147 if ((i > 0) && ctrl->wLength) {
1148 if (copy_to_user(ctrl->data, tbuf, i)) {
1149 ret = -EFAULT;
1150 goto done;
1151 }
1152 }
1153 } else {
1154 if (ctrl->wLength) {
1155 if (copy_from_user(tbuf, ctrl->data, ctrl->wLength)) {
1156 ret = -EFAULT;
1157 goto done;
1158 }
1159 }
1160 pipe = usb_sndctrlpipe(dev, 0);
1161 snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT,
1162 tbuf, ctrl->wLength);
1163
1164 usb_unlock_device(dev);
1165 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl->bRequest,
1166 ctrl->bRequestType, ctrl->wValue, ctrl->wIndex,
1167 tbuf, ctrl->wLength, tmo);
1168 usb_lock_device(dev);
1169 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1170 }
1171 if (i < 0 && i != -EPIPE) {
1172 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1173 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1174 current->comm, ctrl->bRequestType, ctrl->bRequest,
1175 ctrl->wLength, i);
1176 }
1177 ret = i;
1178 done:
1179 free_page((unsigned long) tbuf);
1180 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1181 sizeof(struct usb_ctrlrequest));
1182 return ret;
1183}
1184
1185static int proc_control(struct usb_dev_state *ps, void __user *arg)
1186{
1187 struct usbdevfs_ctrltransfer ctrl;
1188
1189 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1190 return -EFAULT;
1191 return do_proc_control(ps, &ctrl);
1192}
1193
1194static int do_proc_bulk(struct usb_dev_state *ps,
1195 struct usbdevfs_bulktransfer *bulk)
1196{
1197 struct usb_device *dev = ps->dev;
1198 unsigned int tmo, len1, pipe;
1199 int len2;
1200 unsigned char *tbuf;
1201 int i, ret;
1202
1203 ret = findintfep(ps->dev, bulk->ep);
1204 if (ret < 0)
1205 return ret;
1206 ret = checkintf(ps, ret);
1207 if (ret)
1208 return ret;
1209 if (bulk->ep & USB_DIR_IN)
1210 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1211 else
1212 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1213 if (!usb_maxpacket(dev, pipe, !(bulk->ep & USB_DIR_IN)))
1214 return -EINVAL;
1215 len1 = bulk->len;
1216 if (len1 >= (INT_MAX - sizeof(struct urb)))
1217 return -EINVAL;
1218 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1219 if (ret)
1220 return ret;
1221 tbuf = kmalloc(len1, GFP_KERNEL);
1222 if (!tbuf) {
1223 ret = -ENOMEM;
1224 goto done;
1225 }
1226 tmo = bulk->timeout;
1227 if (bulk->ep & 0x80) {
1228 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1229
1230 usb_unlock_device(dev);
1231 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1232 usb_lock_device(dev);
1233 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1234
1235 if (!i && len2) {
1236 if (copy_to_user(bulk->data, tbuf, len2)) {
1237 ret = -EFAULT;
1238 goto done;
1239 }
1240 }
1241 } else {
1242 if (len1) {
1243 if (copy_from_user(tbuf, bulk->data, len1)) {
1244 ret = -EFAULT;
1245 goto done;
1246 }
1247 }
1248 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1249
1250 usb_unlock_device(dev);
1251 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1252 usb_lock_device(dev);
1253 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1254 }
1255 ret = (i < 0 ? i : len2);
1256 done:
1257 kfree(tbuf);
1258 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1259 return ret;
1260}
1261
1262static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1263{
1264 struct usbdevfs_bulktransfer bulk;
1265
1266 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1267 return -EFAULT;
1268 return do_proc_bulk(ps, &bulk);
1269}
1270
1271static void check_reset_of_active_ep(struct usb_device *udev,
1272 unsigned int epnum, char *ioctl_name)
1273{
1274 struct usb_host_endpoint **eps;
1275 struct usb_host_endpoint *ep;
1276
1277 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1278 ep = eps[epnum & 0x0f];
1279 if (ep && !list_empty(&ep->urb_list))
1280 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1281 task_pid_nr(current), current->comm,
1282 ioctl_name, epnum);
1283}
1284
1285static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1286{
1287 unsigned int ep;
1288 int ret;
1289
1290 if (get_user(ep, (unsigned int __user *)arg))
1291 return -EFAULT;
1292 ret = findintfep(ps->dev, ep);
1293 if (ret < 0)
1294 return ret;
1295 ret = checkintf(ps, ret);
1296 if (ret)
1297 return ret;
1298 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1299 usb_reset_endpoint(ps->dev, ep);
1300 return 0;
1301}
1302
1303static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1304{
1305 unsigned int ep;
1306 int pipe;
1307 int ret;
1308
1309 if (get_user(ep, (unsigned int __user *)arg))
1310 return -EFAULT;
1311 ret = findintfep(ps->dev, ep);
1312 if (ret < 0)
1313 return ret;
1314 ret = checkintf(ps, ret);
1315 if (ret)
1316 return ret;
1317 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1318 if (ep & USB_DIR_IN)
1319 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1320 else
1321 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1322
1323 return usb_clear_halt(ps->dev, pipe);
1324}
1325
1326static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1327{
1328 struct usbdevfs_getdriver gd;
1329 struct usb_interface *intf;
1330 int ret;
1331
1332 if (copy_from_user(&gd, arg, sizeof(gd)))
1333 return -EFAULT;
1334 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1335 if (!intf || !intf->dev.driver)
1336 ret = -ENODATA;
1337 else {
1338 strlcpy(gd.driver, intf->dev.driver->name,
1339 sizeof(gd.driver));
1340 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1341 }
1342 return ret;
1343}
1344
1345static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1346{
1347 struct usbdevfs_connectinfo ci;
1348
1349 memset(&ci, 0, sizeof(ci));
1350 ci.devnum = ps->dev->devnum;
1351 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1352
1353 if (copy_to_user(arg, &ci, sizeof(ci)))
1354 return -EFAULT;
1355 return 0;
1356}
1357
1358static int proc_conninfo_ex(struct usb_dev_state *ps,
1359 void __user *arg, size_t size)
1360{
1361 struct usbdevfs_conninfo_ex ci;
1362 struct usb_device *udev = ps->dev;
1363
1364 if (size < sizeof(ci.size))
1365 return -EINVAL;
1366
1367 memset(&ci, 0, sizeof(ci));
1368 ci.size = sizeof(ci);
1369 ci.busnum = udev->bus->busnum;
1370 ci.devnum = udev->devnum;
1371 ci.speed = udev->speed;
1372
1373 while (udev && udev->portnum != 0) {
1374 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1375 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1376 udev->portnum;
1377 udev = udev->parent;
1378 }
1379
1380 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1381 memmove(&ci.ports[0],
1382 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1383 ci.num_ports);
1384
1385 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1386 return -EFAULT;
1387
1388 return 0;
1389}
1390
1391static int proc_resetdevice(struct usb_dev_state *ps)
1392{
1393 struct usb_host_config *actconfig = ps->dev->actconfig;
1394 struct usb_interface *interface;
1395 int i, number;
1396
1397 /* Don't allow a device reset if the process has dropped the
1398 * privilege to do such things and any of the interfaces are
1399 * currently claimed.
1400 */
1401 if (ps->privileges_dropped && actconfig) {
1402 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1403 interface = actconfig->interface[i];
1404 number = interface->cur_altsetting->desc.bInterfaceNumber;
1405 if (usb_interface_claimed(interface) &&
1406 !test_bit(number, &ps->ifclaimed)) {
1407 dev_warn(&ps->dev->dev,
1408 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1409 number, interface->dev.driver->name, current->comm);
1410 return -EACCES;
1411 }
1412 }
1413 }
1414
1415 return usb_reset_device(ps->dev);
1416}
1417
1418static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1419{
1420 struct usbdevfs_setinterface setintf;
1421 int ret;
1422
1423 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1424 return -EFAULT;
1425 ret = checkintf(ps, setintf.interface);
1426 if (ret)
1427 return ret;
1428
1429 destroy_async_on_interface(ps, setintf.interface);
1430
1431 return usb_set_interface(ps->dev, setintf.interface,
1432 setintf.altsetting);
1433}
1434
1435static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1436{
1437 int u;
1438 int status = 0;
1439 struct usb_host_config *actconfig;
1440
1441 if (get_user(u, (int __user *)arg))
1442 return -EFAULT;
1443
1444 actconfig = ps->dev->actconfig;
1445
1446 /* Don't touch the device if any interfaces are claimed.
1447 * It could interfere with other drivers' operations, and if
1448 * an interface is claimed by usbfs it could easily deadlock.
1449 */
1450 if (actconfig) {
1451 int i;
1452
1453 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1454 if (usb_interface_claimed(actconfig->interface[i])) {
1455 dev_warn(&ps->dev->dev,
1456 "usbfs: interface %d claimed by %s "
1457 "while '%s' sets config #%d\n",
1458 actconfig->interface[i]
1459 ->cur_altsetting
1460 ->desc.bInterfaceNumber,
1461 actconfig->interface[i]
1462 ->dev.driver->name,
1463 current->comm, u);
1464 status = -EBUSY;
1465 break;
1466 }
1467 }
1468 }
1469
1470 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1471 * so avoid usb_set_configuration()'s kick to sysfs
1472 */
1473 if (status == 0) {
1474 if (actconfig && actconfig->desc.bConfigurationValue == u)
1475 status = usb_reset_configuration(ps->dev);
1476 else
1477 status = usb_set_configuration(ps->dev, u);
1478 }
1479
1480 return status;
1481}
1482
1483static struct usb_memory *
1484find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1485{
1486 struct usb_memory *usbm = NULL, *iter;
1487 unsigned long flags;
1488 unsigned long uurb_start = (unsigned long)uurb->buffer;
1489
1490 spin_lock_irqsave(&ps->lock, flags);
1491 list_for_each_entry(iter, &ps->memory_list, memlist) {
1492 if (uurb_start >= iter->vm_start &&
1493 uurb_start < iter->vm_start + iter->size) {
1494 if (uurb->buffer_length > iter->vm_start + iter->size -
1495 uurb_start) {
1496 usbm = ERR_PTR(-EINVAL);
1497 } else {
1498 usbm = iter;
1499 usbm->urb_use_count++;
1500 }
1501 break;
1502 }
1503 }
1504 spin_unlock_irqrestore(&ps->lock, flags);
1505 return usbm;
1506}
1507
1508static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1509 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1510 void __user *arg, sigval_t userurb_sigval)
1511{
1512 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1513 struct usb_host_endpoint *ep;
1514 struct async *as = NULL;
1515 struct usb_ctrlrequest *dr = NULL;
1516 unsigned int u, totlen, isofrmlen;
1517 int i, ret, num_sgs = 0, ifnum = -1;
1518 int number_of_packets = 0;
1519 unsigned int stream_id = 0;
1520 void *buf;
1521 bool is_in;
1522 bool allow_short = false;
1523 bool allow_zero = false;
1524 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1525 USBDEVFS_URB_BULK_CONTINUATION |
1526 USBDEVFS_URB_NO_FSBR |
1527 USBDEVFS_URB_ZERO_PACKET |
1528 USBDEVFS_URB_NO_INTERRUPT;
1529 /* USBDEVFS_URB_ISO_ASAP is a special case */
1530 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1531 mask |= USBDEVFS_URB_ISO_ASAP;
1532
1533 if (uurb->flags & ~mask)
1534 return -EINVAL;
1535
1536 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1537 return -EINVAL;
1538 if (uurb->buffer_length > 0 && !uurb->buffer)
1539 return -EINVAL;
1540 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1541 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1542 ifnum = findintfep(ps->dev, uurb->endpoint);
1543 if (ifnum < 0)
1544 return ifnum;
1545 ret = checkintf(ps, ifnum);
1546 if (ret)
1547 return ret;
1548 }
1549 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1550 if (!ep)
1551 return -ENOENT;
1552 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1553
1554 u = 0;
1555 switch (uurb->type) {
1556 case USBDEVFS_URB_TYPE_CONTROL:
1557 if (!usb_endpoint_xfer_control(&ep->desc))
1558 return -EINVAL;
1559 /* min 8 byte setup packet */
1560 if (uurb->buffer_length < 8)
1561 return -EINVAL;
1562 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1563 if (!dr)
1564 return -ENOMEM;
1565 if (copy_from_user(dr, uurb->buffer, 8)) {
1566 ret = -EFAULT;
1567 goto error;
1568 }
1569 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1570 ret = -EINVAL;
1571 goto error;
1572 }
1573 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1574 le16_to_cpu(dr->wIndex));
1575 if (ret)
1576 goto error;
1577 uurb->buffer_length = le16_to_cpu(dr->wLength);
1578 uurb->buffer += 8;
1579 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1580 is_in = true;
1581 uurb->endpoint |= USB_DIR_IN;
1582 } else {
1583 is_in = false;
1584 uurb->endpoint &= ~USB_DIR_IN;
1585 }
1586 if (is_in)
1587 allow_short = true;
1588 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1589 "bRequest=%02x wValue=%04x "
1590 "wIndex=%04x wLength=%04x\n",
1591 dr->bRequestType, dr->bRequest,
1592 __le16_to_cpu(dr->wValue),
1593 __le16_to_cpu(dr->wIndex),
1594 __le16_to_cpu(dr->wLength));
1595 u = sizeof(struct usb_ctrlrequest);
1596 break;
1597
1598 case USBDEVFS_URB_TYPE_BULK:
1599 if (!is_in)
1600 allow_zero = true;
1601 else
1602 allow_short = true;
1603 switch (usb_endpoint_type(&ep->desc)) {
1604 case USB_ENDPOINT_XFER_CONTROL:
1605 case USB_ENDPOINT_XFER_ISOC:
1606 return -EINVAL;
1607 case USB_ENDPOINT_XFER_INT:
1608 /* allow single-shot interrupt transfers */
1609 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1610 goto interrupt_urb;
1611 }
1612 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1613 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1614 num_sgs = 0;
1615 if (ep->streams)
1616 stream_id = uurb->stream_id;
1617 break;
1618
1619 case USBDEVFS_URB_TYPE_INTERRUPT:
1620 if (!usb_endpoint_xfer_int(&ep->desc))
1621 return -EINVAL;
1622 interrupt_urb:
1623 if (!is_in)
1624 allow_zero = true;
1625 else
1626 allow_short = true;
1627 break;
1628
1629 case USBDEVFS_URB_TYPE_ISO:
1630 /* arbitrary limit */
1631 if (uurb->number_of_packets < 1 ||
1632 uurb->number_of_packets > 128)
1633 return -EINVAL;
1634 if (!usb_endpoint_xfer_isoc(&ep->desc))
1635 return -EINVAL;
1636 number_of_packets = uurb->number_of_packets;
1637 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1638 number_of_packets;
1639 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1640 if (IS_ERR(isopkt)) {
1641 ret = PTR_ERR(isopkt);
1642 isopkt = NULL;
1643 goto error;
1644 }
1645 for (totlen = u = 0; u < number_of_packets; u++) {
1646 /*
1647 * arbitrary limit need for USB 3.1 Gen2
1648 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1649 */
1650 if (isopkt[u].length > 98304) {
1651 ret = -EINVAL;
1652 goto error;
1653 }
1654 totlen += isopkt[u].length;
1655 }
1656 u *= sizeof(struct usb_iso_packet_descriptor);
1657 uurb->buffer_length = totlen;
1658 break;
1659
1660 default:
1661 return -EINVAL;
1662 }
1663
1664 if (uurb->buffer_length > 0 &&
1665 !access_ok(uurb->buffer, uurb->buffer_length)) {
1666 ret = -EFAULT;
1667 goto error;
1668 }
1669 as = alloc_async(number_of_packets);
1670 if (!as) {
1671 ret = -ENOMEM;
1672 goto error;
1673 }
1674
1675 as->usbm = find_memory_area(ps, uurb);
1676 if (IS_ERR(as->usbm)) {
1677 ret = PTR_ERR(as->usbm);
1678 as->usbm = NULL;
1679 goto error;
1680 }
1681
1682 /* do not use SG buffers when memory mapped segments
1683 * are in use
1684 */
1685 if (as->usbm)
1686 num_sgs = 0;
1687
1688 u += sizeof(struct async) + sizeof(struct urb) +
1689 (as->usbm ? 0 : uurb->buffer_length) +
1690 num_sgs * sizeof(struct scatterlist);
1691 ret = usbfs_increase_memory_usage(u);
1692 if (ret)
1693 goto error;
1694 as->mem_usage = u;
1695
1696 if (num_sgs) {
1697 as->urb->sg = kmalloc_array(num_sgs,
1698 sizeof(struct scatterlist),
1699 GFP_KERNEL);
1700 if (!as->urb->sg) {
1701 ret = -ENOMEM;
1702 goto error;
1703 }
1704 as->urb->num_sgs = num_sgs;
1705 sg_init_table(as->urb->sg, as->urb->num_sgs);
1706
1707 totlen = uurb->buffer_length;
1708 for (i = 0; i < as->urb->num_sgs; i++) {
1709 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1710 buf = kmalloc(u, GFP_KERNEL);
1711 if (!buf) {
1712 ret = -ENOMEM;
1713 goto error;
1714 }
1715 sg_set_buf(&as->urb->sg[i], buf, u);
1716
1717 if (!is_in) {
1718 if (copy_from_user(buf, uurb->buffer, u)) {
1719 ret = -EFAULT;
1720 goto error;
1721 }
1722 uurb->buffer += u;
1723 }
1724 totlen -= u;
1725 }
1726 } else if (uurb->buffer_length > 0) {
1727 if (as->usbm) {
1728 unsigned long uurb_start = (unsigned long)uurb->buffer;
1729
1730 as->urb->transfer_buffer = as->usbm->mem +
1731 (uurb_start - as->usbm->vm_start);
1732 } else {
1733 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1734 GFP_KERNEL);
1735 if (!as->urb->transfer_buffer) {
1736 ret = -ENOMEM;
1737 goto error;
1738 }
1739 if (!is_in) {
1740 if (copy_from_user(as->urb->transfer_buffer,
1741 uurb->buffer,
1742 uurb->buffer_length)) {
1743 ret = -EFAULT;
1744 goto error;
1745 }
1746 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1747 /*
1748 * Isochronous input data may end up being
1749 * discontiguous if some of the packets are
1750 * short. Clear the buffer so that the gaps
1751 * don't leak kernel data to userspace.
1752 */
1753 memset(as->urb->transfer_buffer, 0,
1754 uurb->buffer_length);
1755 }
1756 }
1757 }
1758 as->urb->dev = ps->dev;
1759 as->urb->pipe = (uurb->type << 30) |
1760 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1761 (uurb->endpoint & USB_DIR_IN);
1762
1763 /* This tedious sequence is necessary because the URB_* flags
1764 * are internal to the kernel and subject to change, whereas
1765 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1766 */
1767 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1768 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1769 u |= URB_ISO_ASAP;
1770 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1771 u |= URB_SHORT_NOT_OK;
1772 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1773 u |= URB_ZERO_PACKET;
1774 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1775 u |= URB_NO_INTERRUPT;
1776 as->urb->transfer_flags = u;
1777
1778 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1779 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1780 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1781 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1782
1783 as->urb->transfer_buffer_length = uurb->buffer_length;
1784 as->urb->setup_packet = (unsigned char *)dr;
1785 dr = NULL;
1786 as->urb->start_frame = uurb->start_frame;
1787 as->urb->number_of_packets = number_of_packets;
1788 as->urb->stream_id = stream_id;
1789
1790 if (ep->desc.bInterval) {
1791 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1792 ps->dev->speed == USB_SPEED_HIGH ||
1793 ps->dev->speed >= USB_SPEED_SUPER)
1794 as->urb->interval = 1 <<
1795 min(15, ep->desc.bInterval - 1);
1796 else
1797 as->urb->interval = ep->desc.bInterval;
1798 }
1799
1800 as->urb->context = as;
1801 as->urb->complete = async_completed;
1802 for (totlen = u = 0; u < number_of_packets; u++) {
1803 as->urb->iso_frame_desc[u].offset = totlen;
1804 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1805 totlen += isopkt[u].length;
1806 }
1807 kfree(isopkt);
1808 isopkt = NULL;
1809 as->ps = ps;
1810 as->userurb = arg;
1811 as->userurb_sigval = userurb_sigval;
1812 if (as->usbm) {
1813 unsigned long uurb_start = (unsigned long)uurb->buffer;
1814
1815 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1816 as->urb->transfer_dma = as->usbm->dma_handle +
1817 (uurb_start - as->usbm->vm_start);
1818 } else if (is_in && uurb->buffer_length > 0)
1819 as->userbuffer = uurb->buffer;
1820 as->signr = uurb->signr;
1821 as->ifnum = ifnum;
1822 as->pid = get_pid(task_pid(current));
1823 as->cred = get_current_cred();
1824 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1825 as->urb->transfer_buffer_length, 0, SUBMIT,
1826 NULL, 0);
1827 if (!is_in)
1828 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1829
1830 async_newpending(as);
1831
1832 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1833 spin_lock_irq(&ps->lock);
1834
1835 /* Not exactly the endpoint address; the direction bit is
1836 * shifted to the 0x10 position so that the value will be
1837 * between 0 and 31.
1838 */
1839 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1840 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1841 >> 3);
1842
1843 /* If this bulk URB is the start of a new transfer, re-enable
1844 * the endpoint. Otherwise mark it as a continuation URB.
1845 */
1846 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1847 as->bulk_status = AS_CONTINUATION;
1848 else
1849 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1850
1851 /* Don't accept continuation URBs if the endpoint is
1852 * disabled because of an earlier error.
1853 */
1854 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1855 ret = -EREMOTEIO;
1856 else
1857 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1858 spin_unlock_irq(&ps->lock);
1859 } else {
1860 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1861 }
1862
1863 if (ret) {
1864 dev_printk(KERN_DEBUG, &ps->dev->dev,
1865 "usbfs: usb_submit_urb returned %d\n", ret);
1866 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1867 0, ret, COMPLETE, NULL, 0);
1868 async_removepending(as);
1869 goto error;
1870 }
1871 return 0;
1872
1873 error:
1874 kfree(isopkt);
1875 kfree(dr);
1876 if (as)
1877 free_async(as);
1878 return ret;
1879}
1880
1881static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1882{
1883 struct usbdevfs_urb uurb;
1884 sigval_t userurb_sigval;
1885
1886 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1887 return -EFAULT;
1888
1889 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1890 userurb_sigval.sival_ptr = arg;
1891
1892 return proc_do_submiturb(ps, &uurb,
1893 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1894 arg, userurb_sigval);
1895}
1896
1897static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1898{
1899 struct urb *urb;
1900 struct async *as;
1901 unsigned long flags;
1902
1903 spin_lock_irqsave(&ps->lock, flags);
1904 as = async_getpending(ps, arg);
1905 if (!as) {
1906 spin_unlock_irqrestore(&ps->lock, flags);
1907 return -EINVAL;
1908 }
1909
1910 urb = as->urb;
1911 usb_get_urb(urb);
1912 spin_unlock_irqrestore(&ps->lock, flags);
1913
1914 usb_kill_urb(urb);
1915 usb_put_urb(urb);
1916
1917 return 0;
1918}
1919
1920static void compute_isochronous_actual_length(struct urb *urb)
1921{
1922 unsigned int i;
1923
1924 if (urb->number_of_packets > 0) {
1925 urb->actual_length = 0;
1926 for (i = 0; i < urb->number_of_packets; i++)
1927 urb->actual_length +=
1928 urb->iso_frame_desc[i].actual_length;
1929 }
1930}
1931
1932static int processcompl(struct async *as, void __user * __user *arg)
1933{
1934 struct urb *urb = as->urb;
1935 struct usbdevfs_urb __user *userurb = as->userurb;
1936 void __user *addr = as->userurb;
1937 unsigned int i;
1938
1939 compute_isochronous_actual_length(urb);
1940 if (as->userbuffer && urb->actual_length) {
1941 if (copy_urb_data_to_user(as->userbuffer, urb))
1942 goto err_out;
1943 }
1944 if (put_user(as->status, &userurb->status))
1945 goto err_out;
1946 if (put_user(urb->actual_length, &userurb->actual_length))
1947 goto err_out;
1948 if (put_user(urb->error_count, &userurb->error_count))
1949 goto err_out;
1950
1951 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1952 for (i = 0; i < urb->number_of_packets; i++) {
1953 if (put_user(urb->iso_frame_desc[i].actual_length,
1954 &userurb->iso_frame_desc[i].actual_length))
1955 goto err_out;
1956 if (put_user(urb->iso_frame_desc[i].status,
1957 &userurb->iso_frame_desc[i].status))
1958 goto err_out;
1959 }
1960 }
1961
1962 if (put_user(addr, (void __user * __user *)arg))
1963 return -EFAULT;
1964 return 0;
1965
1966err_out:
1967 return -EFAULT;
1968}
1969
1970static struct async *reap_as(struct usb_dev_state *ps)
1971{
1972 DECLARE_WAITQUEUE(wait, current);
1973 struct async *as = NULL;
1974 struct usb_device *dev = ps->dev;
1975
1976 add_wait_queue(&ps->wait, &wait);
1977 for (;;) {
1978 __set_current_state(TASK_INTERRUPTIBLE);
1979 as = async_getcompleted(ps);
1980 if (as || !connected(ps))
1981 break;
1982 if (signal_pending(current))
1983 break;
1984 usb_unlock_device(dev);
1985 schedule();
1986 usb_lock_device(dev);
1987 }
1988 remove_wait_queue(&ps->wait, &wait);
1989 set_current_state(TASK_RUNNING);
1990 return as;
1991}
1992
1993static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1994{
1995 struct async *as = reap_as(ps);
1996
1997 if (as) {
1998 int retval;
1999
2000 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2001 retval = processcompl(as, (void __user * __user *)arg);
2002 free_async(as);
2003 return retval;
2004 }
2005 if (signal_pending(current))
2006 return -EINTR;
2007 return -ENODEV;
2008}
2009
2010static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2011{
2012 int retval;
2013 struct async *as;
2014
2015 as = async_getcompleted(ps);
2016 if (as) {
2017 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2018 retval = processcompl(as, (void __user * __user *)arg);
2019 free_async(as);
2020 } else {
2021 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2022 }
2023 return retval;
2024}
2025
2026#ifdef CONFIG_COMPAT
2027static int proc_control_compat(struct usb_dev_state *ps,
2028 struct usbdevfs_ctrltransfer32 __user *p32)
2029{
2030 struct usbdevfs_ctrltransfer ctrl;
2031 u32 udata;
2032
2033 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2034 get_user(udata, &p32->data))
2035 return -EFAULT;
2036 ctrl.data = compat_ptr(udata);
2037 return do_proc_control(ps, &ctrl);
2038}
2039
2040static int proc_bulk_compat(struct usb_dev_state *ps,
2041 struct usbdevfs_bulktransfer32 __user *p32)
2042{
2043 struct usbdevfs_bulktransfer bulk;
2044 compat_caddr_t addr;
2045
2046 if (get_user(bulk.ep, &p32->ep) ||
2047 get_user(bulk.len, &p32->len) ||
2048 get_user(bulk.timeout, &p32->timeout) ||
2049 get_user(addr, &p32->data))
2050 return -EFAULT;
2051 bulk.data = compat_ptr(addr);
2052 return do_proc_bulk(ps, &bulk);
2053}
2054
2055static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2056{
2057 struct usbdevfs_disconnectsignal32 ds;
2058
2059 if (copy_from_user(&ds, arg, sizeof(ds)))
2060 return -EFAULT;
2061 ps->discsignr = ds.signr;
2062 ps->disccontext.sival_int = ds.context;
2063 return 0;
2064}
2065
2066static int get_urb32(struct usbdevfs_urb *kurb,
2067 struct usbdevfs_urb32 __user *uurb)
2068{
2069 struct usbdevfs_urb32 urb32;
2070 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2071 return -EFAULT;
2072 kurb->type = urb32.type;
2073 kurb->endpoint = urb32.endpoint;
2074 kurb->status = urb32.status;
2075 kurb->flags = urb32.flags;
2076 kurb->buffer = compat_ptr(urb32.buffer);
2077 kurb->buffer_length = urb32.buffer_length;
2078 kurb->actual_length = urb32.actual_length;
2079 kurb->start_frame = urb32.start_frame;
2080 kurb->number_of_packets = urb32.number_of_packets;
2081 kurb->error_count = urb32.error_count;
2082 kurb->signr = urb32.signr;
2083 kurb->usercontext = compat_ptr(urb32.usercontext);
2084 return 0;
2085}
2086
2087static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2088{
2089 struct usbdevfs_urb uurb;
2090 sigval_t userurb_sigval;
2091
2092 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2093 return -EFAULT;
2094
2095 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2096 userurb_sigval.sival_int = ptr_to_compat(arg);
2097
2098 return proc_do_submiturb(ps, &uurb,
2099 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2100 arg, userurb_sigval);
2101}
2102
2103static int processcompl_compat(struct async *as, void __user * __user *arg)
2104{
2105 struct urb *urb = as->urb;
2106 struct usbdevfs_urb32 __user *userurb = as->userurb;
2107 void __user *addr = as->userurb;
2108 unsigned int i;
2109
2110 compute_isochronous_actual_length(urb);
2111 if (as->userbuffer && urb->actual_length) {
2112 if (copy_urb_data_to_user(as->userbuffer, urb))
2113 return -EFAULT;
2114 }
2115 if (put_user(as->status, &userurb->status))
2116 return -EFAULT;
2117 if (put_user(urb->actual_length, &userurb->actual_length))
2118 return -EFAULT;
2119 if (put_user(urb->error_count, &userurb->error_count))
2120 return -EFAULT;
2121
2122 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2123 for (i = 0; i < urb->number_of_packets; i++) {
2124 if (put_user(urb->iso_frame_desc[i].actual_length,
2125 &userurb->iso_frame_desc[i].actual_length))
2126 return -EFAULT;
2127 if (put_user(urb->iso_frame_desc[i].status,
2128 &userurb->iso_frame_desc[i].status))
2129 return -EFAULT;
2130 }
2131 }
2132
2133 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2134 return -EFAULT;
2135 return 0;
2136}
2137
2138static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2139{
2140 struct async *as = reap_as(ps);
2141
2142 if (as) {
2143 int retval;
2144
2145 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2146 retval = processcompl_compat(as, (void __user * __user *)arg);
2147 free_async(as);
2148 return retval;
2149 }
2150 if (signal_pending(current))
2151 return -EINTR;
2152 return -ENODEV;
2153}
2154
2155static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2156{
2157 int retval;
2158 struct async *as;
2159
2160 as = async_getcompleted(ps);
2161 if (as) {
2162 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2163 retval = processcompl_compat(as, (void __user * __user *)arg);
2164 free_async(as);
2165 } else {
2166 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2167 }
2168 return retval;
2169}
2170
2171
2172#endif
2173
2174static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2175{
2176 struct usbdevfs_disconnectsignal ds;
2177
2178 if (copy_from_user(&ds, arg, sizeof(ds)))
2179 return -EFAULT;
2180 ps->discsignr = ds.signr;
2181 ps->disccontext.sival_ptr = ds.context;
2182 return 0;
2183}
2184
2185static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2186{
2187 unsigned int ifnum;
2188
2189 if (get_user(ifnum, (unsigned int __user *)arg))
2190 return -EFAULT;
2191 return claimintf(ps, ifnum);
2192}
2193
2194static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2195{
2196 unsigned int ifnum;
2197 int ret;
2198
2199 if (get_user(ifnum, (unsigned int __user *)arg))
2200 return -EFAULT;
2201 ret = releaseintf(ps, ifnum);
2202 if (ret < 0)
2203 return ret;
2204 destroy_async_on_interface(ps, ifnum);
2205 return 0;
2206}
2207
2208static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2209{
2210 int size;
2211 void *buf = NULL;
2212 int retval = 0;
2213 struct usb_interface *intf = NULL;
2214 struct usb_driver *driver = NULL;
2215
2216 if (ps->privileges_dropped)
2217 return -EACCES;
2218
2219 if (!connected(ps))
2220 return -ENODEV;
2221
2222 /* alloc buffer */
2223 size = _IOC_SIZE(ctl->ioctl_code);
2224 if (size > 0) {
2225 buf = kmalloc(size, GFP_KERNEL);
2226 if (buf == NULL)
2227 return -ENOMEM;
2228 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2229 if (copy_from_user(buf, ctl->data, size)) {
2230 kfree(buf);
2231 return -EFAULT;
2232 }
2233 } else {
2234 memset(buf, 0, size);
2235 }
2236 }
2237
2238 if (ps->dev->state != USB_STATE_CONFIGURED)
2239 retval = -EHOSTUNREACH;
2240 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2241 retval = -EINVAL;
2242 else switch (ctl->ioctl_code) {
2243
2244 /* disconnect kernel driver from interface */
2245 case USBDEVFS_DISCONNECT:
2246 if (intf->dev.driver) {
2247 driver = to_usb_driver(intf->dev.driver);
2248 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2249 usb_driver_release_interface(driver, intf);
2250 } else
2251 retval = -ENODATA;
2252 break;
2253
2254 /* let kernel drivers try to (re)bind to the interface */
2255 case USBDEVFS_CONNECT:
2256 if (!intf->dev.driver)
2257 retval = device_attach(&intf->dev);
2258 else
2259 retval = -EBUSY;
2260 break;
2261
2262 /* talk directly to the interface's driver */
2263 default:
2264 if (intf->dev.driver)
2265 driver = to_usb_driver(intf->dev.driver);
2266 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2267 retval = -ENOTTY;
2268 } else {
2269 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2270 if (retval == -ENOIOCTLCMD)
2271 retval = -ENOTTY;
2272 }
2273 }
2274
2275 /* cleanup and return */
2276 if (retval >= 0
2277 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2278 && size > 0
2279 && copy_to_user(ctl->data, buf, size) != 0)
2280 retval = -EFAULT;
2281
2282 kfree(buf);
2283 return retval;
2284}
2285
2286static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2287{
2288 struct usbdevfs_ioctl ctrl;
2289
2290 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2291 return -EFAULT;
2292 return proc_ioctl(ps, &ctrl);
2293}
2294
2295#ifdef CONFIG_COMPAT
2296static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2297{
2298 struct usbdevfs_ioctl32 ioc32;
2299 struct usbdevfs_ioctl ctrl;
2300
2301 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2302 return -EFAULT;
2303 ctrl.ifno = ioc32.ifno;
2304 ctrl.ioctl_code = ioc32.ioctl_code;
2305 ctrl.data = compat_ptr(ioc32.data);
2306 return proc_ioctl(ps, &ctrl);
2307}
2308#endif
2309
2310static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2311{
2312 unsigned portnum;
2313 int rc;
2314
2315 if (get_user(portnum, (unsigned __user *) arg))
2316 return -EFAULT;
2317 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2318 if (rc == 0)
2319 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2320 portnum, task_pid_nr(current), current->comm);
2321 return rc;
2322}
2323
2324static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2325{
2326 unsigned portnum;
2327
2328 if (get_user(portnum, (unsigned __user *) arg))
2329 return -EFAULT;
2330 return usb_hub_release_port(ps->dev, portnum, ps);
2331}
2332
2333static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2334{
2335 __u32 caps;
2336
2337 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2338 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2339 USBDEVFS_CAP_DROP_PRIVILEGES |
2340 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2341 if (!ps->dev->bus->no_stop_on_short)
2342 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2343 if (ps->dev->bus->sg_tablesize)
2344 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2345
2346 if (put_user(caps, (__u32 __user *)arg))
2347 return -EFAULT;
2348
2349 return 0;
2350}
2351
2352static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2353{
2354 struct usbdevfs_disconnect_claim dc;
2355 struct usb_interface *intf;
2356
2357 if (copy_from_user(&dc, arg, sizeof(dc)))
2358 return -EFAULT;
2359
2360 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2361 if (!intf)
2362 return -EINVAL;
2363
2364 if (intf->dev.driver) {
2365 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2366
2367 if (ps->privileges_dropped)
2368 return -EACCES;
2369
2370 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2371 strncmp(dc.driver, intf->dev.driver->name,
2372 sizeof(dc.driver)) != 0)
2373 return -EBUSY;
2374
2375 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2376 strncmp(dc.driver, intf->dev.driver->name,
2377 sizeof(dc.driver)) == 0)
2378 return -EBUSY;
2379
2380 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2381 usb_driver_release_interface(driver, intf);
2382 }
2383
2384 return claimintf(ps, dc.interface);
2385}
2386
2387static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2388{
2389 unsigned num_streams, num_eps;
2390 struct usb_host_endpoint **eps;
2391 struct usb_interface *intf;
2392 int r;
2393
2394 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2395 &eps, &intf);
2396 if (r)
2397 return r;
2398
2399 destroy_async_on_interface(ps,
2400 intf->altsetting[0].desc.bInterfaceNumber);
2401
2402 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2403 kfree(eps);
2404 return r;
2405}
2406
2407static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2408{
2409 unsigned num_eps;
2410 struct usb_host_endpoint **eps;
2411 struct usb_interface *intf;
2412 int r;
2413
2414 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2415 if (r)
2416 return r;
2417
2418 destroy_async_on_interface(ps,
2419 intf->altsetting[0].desc.bInterfaceNumber);
2420
2421 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2422 kfree(eps);
2423 return r;
2424}
2425
2426static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2427{
2428 u32 data;
2429
2430 if (copy_from_user(&data, arg, sizeof(data)))
2431 return -EFAULT;
2432
2433 /* This is a one way operation. Once privileges are
2434 * dropped, you cannot regain them. You may however reissue
2435 * this ioctl to shrink the allowed interfaces mask.
2436 */
2437 ps->interface_allowed_mask &= data;
2438 ps->privileges_dropped = true;
2439
2440 return 0;
2441}
2442
2443static int proc_forbid_suspend(struct usb_dev_state *ps)
2444{
2445 int ret = 0;
2446
2447 if (ps->suspend_allowed) {
2448 ret = usb_autoresume_device(ps->dev);
2449 if (ret == 0)
2450 ps->suspend_allowed = false;
2451 else if (ret != -ENODEV)
2452 ret = -EIO;
2453 }
2454 return ret;
2455}
2456
2457static int proc_allow_suspend(struct usb_dev_state *ps)
2458{
2459 if (!connected(ps))
2460 return -ENODEV;
2461
2462 WRITE_ONCE(ps->not_yet_resumed, 1);
2463 if (!ps->suspend_allowed) {
2464 usb_autosuspend_device(ps->dev);
2465 ps->suspend_allowed = true;
2466 }
2467 return 0;
2468}
2469
2470static int proc_wait_for_resume(struct usb_dev_state *ps)
2471{
2472 int ret;
2473
2474 usb_unlock_device(ps->dev);
2475 ret = wait_event_interruptible(ps->wait_for_resume,
2476 READ_ONCE(ps->not_yet_resumed) == 0);
2477 usb_lock_device(ps->dev);
2478
2479 if (ret != 0)
2480 return -EINTR;
2481 return proc_forbid_suspend(ps);
2482}
2483
2484/*
2485 * NOTE: All requests here that have interface numbers as parameters
2486 * are assuming that somehow the configuration has been prevented from
2487 * changing. But there's no mechanism to ensure that...
2488 */
2489static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2490 void __user *p)
2491{
2492 struct usb_dev_state *ps = file->private_data;
2493 struct inode *inode = file_inode(file);
2494 struct usb_device *dev = ps->dev;
2495 int ret = -ENOTTY;
2496
2497 if (!(file->f_mode & FMODE_WRITE))
2498 return -EPERM;
2499
2500 usb_lock_device(dev);
2501
2502 /* Reap operations are allowed even after disconnection */
2503 switch (cmd) {
2504 case USBDEVFS_REAPURB:
2505 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2506 ret = proc_reapurb(ps, p);
2507 goto done;
2508
2509 case USBDEVFS_REAPURBNDELAY:
2510 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2511 ret = proc_reapurbnonblock(ps, p);
2512 goto done;
2513
2514#ifdef CONFIG_COMPAT
2515 case USBDEVFS_REAPURB32:
2516 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2517 ret = proc_reapurb_compat(ps, p);
2518 goto done;
2519
2520 case USBDEVFS_REAPURBNDELAY32:
2521 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2522 ret = proc_reapurbnonblock_compat(ps, p);
2523 goto done;
2524#endif
2525 }
2526
2527 if (!connected(ps)) {
2528 usb_unlock_device(dev);
2529 return -ENODEV;
2530 }
2531
2532 switch (cmd) {
2533 case USBDEVFS_CONTROL:
2534 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2535 ret = proc_control(ps, p);
2536 if (ret >= 0)
2537 inode->i_mtime = current_time(inode);
2538 break;
2539
2540 case USBDEVFS_BULK:
2541 snoop(&dev->dev, "%s: BULK\n", __func__);
2542 ret = proc_bulk(ps, p);
2543 if (ret >= 0)
2544 inode->i_mtime = current_time(inode);
2545 break;
2546
2547 case USBDEVFS_RESETEP:
2548 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2549 ret = proc_resetep(ps, p);
2550 if (ret >= 0)
2551 inode->i_mtime = current_time(inode);
2552 break;
2553
2554 case USBDEVFS_RESET:
2555 snoop(&dev->dev, "%s: RESET\n", __func__);
2556 ret = proc_resetdevice(ps);
2557 break;
2558
2559 case USBDEVFS_CLEAR_HALT:
2560 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2561 ret = proc_clearhalt(ps, p);
2562 if (ret >= 0)
2563 inode->i_mtime = current_time(inode);
2564 break;
2565
2566 case USBDEVFS_GETDRIVER:
2567 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2568 ret = proc_getdriver(ps, p);
2569 break;
2570
2571 case USBDEVFS_CONNECTINFO:
2572 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2573 ret = proc_connectinfo(ps, p);
2574 break;
2575
2576 case USBDEVFS_SETINTERFACE:
2577 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2578 ret = proc_setintf(ps, p);
2579 break;
2580
2581 case USBDEVFS_SETCONFIGURATION:
2582 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2583 ret = proc_setconfig(ps, p);
2584 break;
2585
2586 case USBDEVFS_SUBMITURB:
2587 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2588 ret = proc_submiturb(ps, p);
2589 if (ret >= 0)
2590 inode->i_mtime = current_time(inode);
2591 break;
2592
2593#ifdef CONFIG_COMPAT
2594 case USBDEVFS_CONTROL32:
2595 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2596 ret = proc_control_compat(ps, p);
2597 if (ret >= 0)
2598 inode->i_mtime = current_time(inode);
2599 break;
2600
2601 case USBDEVFS_BULK32:
2602 snoop(&dev->dev, "%s: BULK32\n", __func__);
2603 ret = proc_bulk_compat(ps, p);
2604 if (ret >= 0)
2605 inode->i_mtime = current_time(inode);
2606 break;
2607
2608 case USBDEVFS_DISCSIGNAL32:
2609 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2610 ret = proc_disconnectsignal_compat(ps, p);
2611 break;
2612
2613 case USBDEVFS_SUBMITURB32:
2614 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2615 ret = proc_submiturb_compat(ps, p);
2616 if (ret >= 0)
2617 inode->i_mtime = current_time(inode);
2618 break;
2619
2620 case USBDEVFS_IOCTL32:
2621 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2622 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2623 break;
2624#endif
2625
2626 case USBDEVFS_DISCARDURB:
2627 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2628 ret = proc_unlinkurb(ps, p);
2629 break;
2630
2631 case USBDEVFS_DISCSIGNAL:
2632 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2633 ret = proc_disconnectsignal(ps, p);
2634 break;
2635
2636 case USBDEVFS_CLAIMINTERFACE:
2637 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2638 ret = proc_claiminterface(ps, p);
2639 break;
2640
2641 case USBDEVFS_RELEASEINTERFACE:
2642 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2643 ret = proc_releaseinterface(ps, p);
2644 break;
2645
2646 case USBDEVFS_IOCTL:
2647 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2648 ret = proc_ioctl_default(ps, p);
2649 break;
2650
2651 case USBDEVFS_CLAIM_PORT:
2652 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2653 ret = proc_claim_port(ps, p);
2654 break;
2655
2656 case USBDEVFS_RELEASE_PORT:
2657 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2658 ret = proc_release_port(ps, p);
2659 break;
2660 case USBDEVFS_GET_CAPABILITIES:
2661 ret = proc_get_capabilities(ps, p);
2662 break;
2663 case USBDEVFS_DISCONNECT_CLAIM:
2664 ret = proc_disconnect_claim(ps, p);
2665 break;
2666 case USBDEVFS_ALLOC_STREAMS:
2667 ret = proc_alloc_streams(ps, p);
2668 break;
2669 case USBDEVFS_FREE_STREAMS:
2670 ret = proc_free_streams(ps, p);
2671 break;
2672 case USBDEVFS_DROP_PRIVILEGES:
2673 ret = proc_drop_privileges(ps, p);
2674 break;
2675 case USBDEVFS_GET_SPEED:
2676 ret = ps->dev->speed;
2677 break;
2678 case USBDEVFS_FORBID_SUSPEND:
2679 ret = proc_forbid_suspend(ps);
2680 break;
2681 case USBDEVFS_ALLOW_SUSPEND:
2682 ret = proc_allow_suspend(ps);
2683 break;
2684 case USBDEVFS_WAIT_FOR_RESUME:
2685 ret = proc_wait_for_resume(ps);
2686 break;
2687 }
2688
2689 /* Handle variable-length commands */
2690 switch (cmd & ~IOCSIZE_MASK) {
2691 case USBDEVFS_CONNINFO_EX(0):
2692 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2693 break;
2694 }
2695
2696 done:
2697 usb_unlock_device(dev);
2698 if (ret >= 0)
2699 inode->i_atime = current_time(inode);
2700 return ret;
2701}
2702
2703static long usbdev_ioctl(struct file *file, unsigned int cmd,
2704 unsigned long arg)
2705{
2706 int ret;
2707
2708 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2709
2710 return ret;
2711}
2712
2713/* No kernel lock - fine */
2714static __poll_t usbdev_poll(struct file *file,
2715 struct poll_table_struct *wait)
2716{
2717 struct usb_dev_state *ps = file->private_data;
2718 __poll_t mask = 0;
2719
2720 poll_wait(file, &ps->wait, wait);
2721 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2722 mask |= EPOLLOUT | EPOLLWRNORM;
2723 if (!connected(ps))
2724 mask |= EPOLLHUP;
2725 if (list_empty(&ps->list))
2726 mask |= EPOLLERR;
2727 return mask;
2728}
2729
2730const struct file_operations usbdev_file_operations = {
2731 .owner = THIS_MODULE,
2732 .llseek = no_seek_end_llseek,
2733 .read = usbdev_read,
2734 .poll = usbdev_poll,
2735 .unlocked_ioctl = usbdev_ioctl,
2736 .compat_ioctl = compat_ptr_ioctl,
2737 .mmap = usbdev_mmap,
2738 .open = usbdev_open,
2739 .release = usbdev_release,
2740};
2741
2742static void usbdev_remove(struct usb_device *udev)
2743{
2744 struct usb_dev_state *ps;
2745
2746 /* Protect against simultaneous resume */
2747 mutex_lock(&usbfs_mutex);
2748 while (!list_empty(&udev->filelist)) {
2749 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2750 destroy_all_async(ps);
2751 wake_up_all(&ps->wait);
2752 WRITE_ONCE(ps->not_yet_resumed, 0);
2753 wake_up_all(&ps->wait_for_resume);
2754 list_del_init(&ps->list);
2755 if (ps->discsignr)
2756 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2757 ps->disc_pid, ps->cred);
2758 }
2759 mutex_unlock(&usbfs_mutex);
2760}
2761
2762static int usbdev_notify(struct notifier_block *self,
2763 unsigned long action, void *dev)
2764{
2765 switch (action) {
2766 case USB_DEVICE_ADD:
2767 break;
2768 case USB_DEVICE_REMOVE:
2769 usbdev_remove(dev);
2770 break;
2771 }
2772 return NOTIFY_OK;
2773}
2774
2775static struct notifier_block usbdev_nb = {
2776 .notifier_call = usbdev_notify,
2777};
2778
2779static struct cdev usb_device_cdev;
2780
2781int __init usb_devio_init(void)
2782{
2783 int retval;
2784
2785 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2786 "usb_device");
2787 if (retval) {
2788 printk(KERN_ERR "Unable to register minors for usb_device\n");
2789 goto out;
2790 }
2791 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2792 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2793 if (retval) {
2794 printk(KERN_ERR "Unable to get usb_device major %d\n",
2795 USB_DEVICE_MAJOR);
2796 goto error_cdev;
2797 }
2798 usb_register_notify(&usbdev_nb);
2799out:
2800 return retval;
2801
2802error_cdev:
2803 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2804 goto out;
2805}
2806
2807void usb_devio_cleanup(void)
2808{
2809 usb_unregister_notify(&usbdev_nb);
2810 cdev_del(&usb_device_cdev);
2811 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2812}
1/*****************************************************************************/
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/usb.h>
44#include <linux/usbdevice_fs.h>
45#include <linux/usb/hcd.h> /* for usbcore internals */
46#include <linux/cdev.h>
47#include <linux/notifier.h>
48#include <linux/security.h>
49#include <linux/user_namespace.h>
50#include <asm/uaccess.h>
51#include <asm/byteorder.h>
52#include <linux/moduleparam.h>
53
54#include "usb.h"
55
56#define USB_MAXBUS 64
57#define USB_DEVICE_MAX USB_MAXBUS * 128
58
59/* Mutual exclusion for removal, open, and release */
60DEFINE_MUTEX(usbfs_mutex);
61
62struct dev_state {
63 struct list_head list; /* state list */
64 struct usb_device *dev;
65 struct file *file;
66 spinlock_t lock; /* protects the async urb lists */
67 struct list_head async_pending;
68 struct list_head async_completed;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 const struct cred *cred;
73 void __user *disccontext;
74 unsigned long ifclaimed;
75 u32 secid;
76 u32 disabled_bulk_eps;
77};
78
79struct async {
80 struct list_head asynclist;
81 struct dev_state *ps;
82 struct pid *pid;
83 const struct cred *cred;
84 unsigned int signr;
85 unsigned int ifnum;
86 void __user *userbuffer;
87 void __user *userurb;
88 struct urb *urb;
89 unsigned int mem_usage;
90 int status;
91 u32 secid;
92 u8 bulk_addr;
93 u8 bulk_status;
94};
95
96static bool usbfs_snoop;
97module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100#define snoop(dev, format, arg...) \
101 do { \
102 if (usbfs_snoop) \
103 dev_info(dev , format , ## arg); \
104 } while (0)
105
106enum snoop_when {
107 SUBMIT, COMPLETE
108};
109
110#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
111
112/* Limit on the total amount of memory we can allocate for transfers */
113static unsigned usbfs_memory_mb = 16;
114module_param(usbfs_memory_mb, uint, 0644);
115MODULE_PARM_DESC(usbfs_memory_mb,
116 "maximum MB allowed for usbfs buffers (0 = no limit)");
117
118/* Hard limit, necessary to avoid aithmetic overflow */
119#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
120
121static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
122
123/* Check whether it's okay to allocate more memory for a transfer */
124static int usbfs_increase_memory_usage(unsigned amount)
125{
126 unsigned lim;
127
128 /*
129 * Convert usbfs_memory_mb to bytes, avoiding overflows.
130 * 0 means use the hard limit (effectively unlimited).
131 */
132 lim = ACCESS_ONCE(usbfs_memory_mb);
133 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
134 lim = USBFS_XFER_MAX;
135 else
136 lim <<= 20;
137
138 atomic_add(amount, &usbfs_memory_usage);
139 if (atomic_read(&usbfs_memory_usage) <= lim)
140 return 0;
141 atomic_sub(amount, &usbfs_memory_usage);
142 return -ENOMEM;
143}
144
145/* Memory for a transfer is being deallocated */
146static void usbfs_decrease_memory_usage(unsigned amount)
147{
148 atomic_sub(amount, &usbfs_memory_usage);
149}
150
151static int connected(struct dev_state *ps)
152{
153 return (!list_empty(&ps->list) &&
154 ps->dev->state != USB_STATE_NOTATTACHED);
155}
156
157static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
158{
159 loff_t ret;
160
161 mutex_lock(&file->f_dentry->d_inode->i_mutex);
162
163 switch (orig) {
164 case 0:
165 file->f_pos = offset;
166 ret = file->f_pos;
167 break;
168 case 1:
169 file->f_pos += offset;
170 ret = file->f_pos;
171 break;
172 case 2:
173 default:
174 ret = -EINVAL;
175 }
176
177 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
178 return ret;
179}
180
181static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
182 loff_t *ppos)
183{
184 struct dev_state *ps = file->private_data;
185 struct usb_device *dev = ps->dev;
186 ssize_t ret = 0;
187 unsigned len;
188 loff_t pos;
189 int i;
190
191 pos = *ppos;
192 usb_lock_device(dev);
193 if (!connected(ps)) {
194 ret = -ENODEV;
195 goto err;
196 } else if (pos < 0) {
197 ret = -EINVAL;
198 goto err;
199 }
200
201 if (pos < sizeof(struct usb_device_descriptor)) {
202 /* 18 bytes - fits on the stack */
203 struct usb_device_descriptor temp_desc;
204
205 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
206 le16_to_cpus(&temp_desc.bcdUSB);
207 le16_to_cpus(&temp_desc.idVendor);
208 le16_to_cpus(&temp_desc.idProduct);
209 le16_to_cpus(&temp_desc.bcdDevice);
210
211 len = sizeof(struct usb_device_descriptor) - pos;
212 if (len > nbytes)
213 len = nbytes;
214 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
215 ret = -EFAULT;
216 goto err;
217 }
218
219 *ppos += len;
220 buf += len;
221 nbytes -= len;
222 ret += len;
223 }
224
225 pos = sizeof(struct usb_device_descriptor);
226 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
227 struct usb_config_descriptor *config =
228 (struct usb_config_descriptor *)dev->rawdescriptors[i];
229 unsigned int length = le16_to_cpu(config->wTotalLength);
230
231 if (*ppos < pos + length) {
232
233 /* The descriptor may claim to be longer than it
234 * really is. Here is the actual allocated length. */
235 unsigned alloclen =
236 le16_to_cpu(dev->config[i].desc.wTotalLength);
237
238 len = length - (*ppos - pos);
239 if (len > nbytes)
240 len = nbytes;
241
242 /* Simply don't write (skip over) unallocated parts */
243 if (alloclen > (*ppos - pos)) {
244 alloclen -= (*ppos - pos);
245 if (copy_to_user(buf,
246 dev->rawdescriptors[i] + (*ppos - pos),
247 min(len, alloclen))) {
248 ret = -EFAULT;
249 goto err;
250 }
251 }
252
253 *ppos += len;
254 buf += len;
255 nbytes -= len;
256 ret += len;
257 }
258
259 pos += length;
260 }
261
262err:
263 usb_unlock_device(dev);
264 return ret;
265}
266
267/*
268 * async list handling
269 */
270
271static struct async *alloc_async(unsigned int numisoframes)
272{
273 struct async *as;
274
275 as = kzalloc(sizeof(struct async), GFP_KERNEL);
276 if (!as)
277 return NULL;
278 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
279 if (!as->urb) {
280 kfree(as);
281 return NULL;
282 }
283 return as;
284}
285
286static void free_async(struct async *as)
287{
288 put_pid(as->pid);
289 if (as->cred)
290 put_cred(as->cred);
291 kfree(as->urb->transfer_buffer);
292 kfree(as->urb->setup_packet);
293 usb_free_urb(as->urb);
294 usbfs_decrease_memory_usage(as->mem_usage);
295 kfree(as);
296}
297
298static void async_newpending(struct async *as)
299{
300 struct dev_state *ps = as->ps;
301 unsigned long flags;
302
303 spin_lock_irqsave(&ps->lock, flags);
304 list_add_tail(&as->asynclist, &ps->async_pending);
305 spin_unlock_irqrestore(&ps->lock, flags);
306}
307
308static void async_removepending(struct async *as)
309{
310 struct dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_del_init(&as->asynclist);
315 spin_unlock_irqrestore(&ps->lock, flags);
316}
317
318static struct async *async_getcompleted(struct dev_state *ps)
319{
320 unsigned long flags;
321 struct async *as = NULL;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 if (!list_empty(&ps->async_completed)) {
325 as = list_entry(ps->async_completed.next, struct async,
326 asynclist);
327 list_del_init(&as->asynclist);
328 }
329 spin_unlock_irqrestore(&ps->lock, flags);
330 return as;
331}
332
333static struct async *async_getpending(struct dev_state *ps,
334 void __user *userurb)
335{
336 struct async *as;
337
338 list_for_each_entry(as, &ps->async_pending, asynclist)
339 if (as->userurb == userurb) {
340 list_del_init(&as->asynclist);
341 return as;
342 }
343
344 return NULL;
345}
346
347static void snoop_urb(struct usb_device *udev,
348 void __user *userurb, int pipe, unsigned length,
349 int timeout_or_status, enum snoop_when when,
350 unsigned char *data, unsigned data_len)
351{
352 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
353 static const char *dirs[] = {"out", "in"};
354 int ep;
355 const char *t, *d;
356
357 if (!usbfs_snoop)
358 return;
359
360 ep = usb_pipeendpoint(pipe);
361 t = types[usb_pipetype(pipe)];
362 d = dirs[!!usb_pipein(pipe)];
363
364 if (userurb) { /* Async */
365 if (when == SUBMIT)
366 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
367 "length %u\n",
368 userurb, ep, t, d, length);
369 else
370 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
371 "actual_length %u status %d\n",
372 userurb, ep, t, d, length,
373 timeout_or_status);
374 } else {
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
377 "timeout %d\n",
378 ep, t, d, length, timeout_or_status);
379 else
380 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
381 "status %d\n",
382 ep, t, d, length, timeout_or_status);
383 }
384
385 if (data && data_len > 0) {
386 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
387 data, data_len, 1);
388 }
389}
390
391#define AS_CONTINUATION 1
392#define AS_UNLINK 2
393
394static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
395__releases(ps->lock)
396__acquires(ps->lock)
397{
398 struct urb *urb;
399 struct async *as;
400
401 /* Mark all the pending URBs that match bulk_addr, up to but not
402 * including the first one without AS_CONTINUATION. If such an
403 * URB is encountered then a new transfer has already started so
404 * the endpoint doesn't need to be disabled; otherwise it does.
405 */
406 list_for_each_entry(as, &ps->async_pending, asynclist) {
407 if (as->bulk_addr == bulk_addr) {
408 if (as->bulk_status != AS_CONTINUATION)
409 goto rescan;
410 as->bulk_status = AS_UNLINK;
411 as->bulk_addr = 0;
412 }
413 }
414 ps->disabled_bulk_eps |= (1 << bulk_addr);
415
416 /* Now carefully unlink all the marked pending URBs */
417 rescan:
418 list_for_each_entry(as, &ps->async_pending, asynclist) {
419 if (as->bulk_status == AS_UNLINK) {
420 as->bulk_status = 0; /* Only once */
421 urb = as->urb;
422 usb_get_urb(urb);
423 spin_unlock(&ps->lock); /* Allow completions */
424 usb_unlink_urb(urb);
425 usb_put_urb(urb);
426 spin_lock(&ps->lock);
427 goto rescan;
428 }
429 }
430}
431
432static void async_completed(struct urb *urb)
433{
434 struct async *as = urb->context;
435 struct dev_state *ps = as->ps;
436 struct siginfo sinfo;
437 struct pid *pid = NULL;
438 u32 secid = 0;
439 const struct cred *cred = NULL;
440 int signr;
441
442 spin_lock(&ps->lock);
443 list_move_tail(&as->asynclist, &ps->async_completed);
444 as->status = urb->status;
445 signr = as->signr;
446 if (signr) {
447 sinfo.si_signo = as->signr;
448 sinfo.si_errno = as->status;
449 sinfo.si_code = SI_ASYNCIO;
450 sinfo.si_addr = as->userurb;
451 pid = get_pid(as->pid);
452 cred = get_cred(as->cred);
453 secid = as->secid;
454 }
455 snoop(&urb->dev->dev, "urb complete\n");
456 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
457 as->status, COMPLETE,
458 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
459 NULL : urb->transfer_buffer, urb->actual_length);
460 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
461 as->status != -ENOENT)
462 cancel_bulk_urbs(ps, as->bulk_addr);
463 spin_unlock(&ps->lock);
464
465 if (signr) {
466 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
467 put_pid(pid);
468 put_cred(cred);
469 }
470
471 wake_up(&ps->wait);
472}
473
474static void destroy_async(struct dev_state *ps, struct list_head *list)
475{
476 struct urb *urb;
477 struct async *as;
478 unsigned long flags;
479
480 spin_lock_irqsave(&ps->lock, flags);
481 while (!list_empty(list)) {
482 as = list_entry(list->next, struct async, asynclist);
483 list_del_init(&as->asynclist);
484 urb = as->urb;
485 usb_get_urb(urb);
486
487 /* drop the spinlock so the completion handler can run */
488 spin_unlock_irqrestore(&ps->lock, flags);
489 usb_kill_urb(urb);
490 usb_put_urb(urb);
491 spin_lock_irqsave(&ps->lock, flags);
492 }
493 spin_unlock_irqrestore(&ps->lock, flags);
494}
495
496static void destroy_async_on_interface(struct dev_state *ps,
497 unsigned int ifnum)
498{
499 struct list_head *p, *q, hitlist;
500 unsigned long flags;
501
502 INIT_LIST_HEAD(&hitlist);
503 spin_lock_irqsave(&ps->lock, flags);
504 list_for_each_safe(p, q, &ps->async_pending)
505 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
506 list_move_tail(p, &hitlist);
507 spin_unlock_irqrestore(&ps->lock, flags);
508 destroy_async(ps, &hitlist);
509}
510
511static void destroy_all_async(struct dev_state *ps)
512{
513 destroy_async(ps, &ps->async_pending);
514}
515
516/*
517 * interface claims are made only at the request of user level code,
518 * which can also release them (explicitly or by closing files).
519 * they're also undone when devices disconnect.
520 */
521
522static int driver_probe(struct usb_interface *intf,
523 const struct usb_device_id *id)
524{
525 return -ENODEV;
526}
527
528static void driver_disconnect(struct usb_interface *intf)
529{
530 struct dev_state *ps = usb_get_intfdata(intf);
531 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
532
533 if (!ps)
534 return;
535
536 /* NOTE: this relies on usbcore having canceled and completed
537 * all pending I/O requests; 2.6 does that.
538 */
539
540 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
541 clear_bit(ifnum, &ps->ifclaimed);
542 else
543 dev_warn(&intf->dev, "interface number %u out of range\n",
544 ifnum);
545
546 usb_set_intfdata(intf, NULL);
547
548 /* force async requests to complete */
549 destroy_async_on_interface(ps, ifnum);
550}
551
552/* The following routines are merely placeholders. There is no way
553 * to inform a user task about suspend or resumes.
554 */
555static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
556{
557 return 0;
558}
559
560static int driver_resume(struct usb_interface *intf)
561{
562 return 0;
563}
564
565struct usb_driver usbfs_driver = {
566 .name = "usbfs",
567 .probe = driver_probe,
568 .disconnect = driver_disconnect,
569 .suspend = driver_suspend,
570 .resume = driver_resume,
571};
572
573static int claimintf(struct dev_state *ps, unsigned int ifnum)
574{
575 struct usb_device *dev = ps->dev;
576 struct usb_interface *intf;
577 int err;
578
579 if (ifnum >= 8*sizeof(ps->ifclaimed))
580 return -EINVAL;
581 /* already claimed */
582 if (test_bit(ifnum, &ps->ifclaimed))
583 return 0;
584
585 intf = usb_ifnum_to_if(dev, ifnum);
586 if (!intf)
587 err = -ENOENT;
588 else
589 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
590 if (err == 0)
591 set_bit(ifnum, &ps->ifclaimed);
592 return err;
593}
594
595static int releaseintf(struct dev_state *ps, unsigned int ifnum)
596{
597 struct usb_device *dev;
598 struct usb_interface *intf;
599 int err;
600
601 err = -EINVAL;
602 if (ifnum >= 8*sizeof(ps->ifclaimed))
603 return err;
604 dev = ps->dev;
605 intf = usb_ifnum_to_if(dev, ifnum);
606 if (!intf)
607 err = -ENOENT;
608 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
609 usb_driver_release_interface(&usbfs_driver, intf);
610 err = 0;
611 }
612 return err;
613}
614
615static int checkintf(struct dev_state *ps, unsigned int ifnum)
616{
617 if (ps->dev->state != USB_STATE_CONFIGURED)
618 return -EHOSTUNREACH;
619 if (ifnum >= 8*sizeof(ps->ifclaimed))
620 return -EINVAL;
621 if (test_bit(ifnum, &ps->ifclaimed))
622 return 0;
623 /* if not yet claimed, claim it for the driver */
624 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
625 "interface %u before use\n", task_pid_nr(current),
626 current->comm, ifnum);
627 return claimintf(ps, ifnum);
628}
629
630static int findintfep(struct usb_device *dev, unsigned int ep)
631{
632 unsigned int i, j, e;
633 struct usb_interface *intf;
634 struct usb_host_interface *alts;
635 struct usb_endpoint_descriptor *endpt;
636
637 if (ep & ~(USB_DIR_IN|0xf))
638 return -EINVAL;
639 if (!dev->actconfig)
640 return -ESRCH;
641 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
642 intf = dev->actconfig->interface[i];
643 for (j = 0; j < intf->num_altsetting; j++) {
644 alts = &intf->altsetting[j];
645 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
646 endpt = &alts->endpoint[e].desc;
647 if (endpt->bEndpointAddress == ep)
648 return alts->desc.bInterfaceNumber;
649 }
650 }
651 }
652 return -ENOENT;
653}
654
655static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
656 unsigned int request, unsigned int index)
657{
658 int ret = 0;
659 struct usb_host_interface *alt_setting;
660
661 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
662 && ps->dev->state != USB_STATE_ADDRESS
663 && ps->dev->state != USB_STATE_CONFIGURED)
664 return -EHOSTUNREACH;
665 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
666 return 0;
667
668 /*
669 * check for the special corner case 'get_device_id' in the printer
670 * class specification, where wIndex is (interface << 8 | altsetting)
671 * instead of just interface
672 */
673 if (requesttype == 0xa1 && request == 0) {
674 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
675 index >> 8, index & 0xff);
676 if (alt_setting
677 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
678 index >>= 8;
679 }
680
681 index &= 0xff;
682 switch (requesttype & USB_RECIP_MASK) {
683 case USB_RECIP_ENDPOINT:
684 ret = findintfep(ps->dev, index);
685 if (ret >= 0)
686 ret = checkintf(ps, ret);
687 break;
688
689 case USB_RECIP_INTERFACE:
690 ret = checkintf(ps, index);
691 break;
692 }
693 return ret;
694}
695
696static int match_devt(struct device *dev, void *data)
697{
698 return dev->devt == (dev_t) (unsigned long) data;
699}
700
701static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
702{
703 struct device *dev;
704
705 dev = bus_find_device(&usb_bus_type, NULL,
706 (void *) (unsigned long) devt, match_devt);
707 if (!dev)
708 return NULL;
709 return container_of(dev, struct usb_device, dev);
710}
711
712/*
713 * file operations
714 */
715static int usbdev_open(struct inode *inode, struct file *file)
716{
717 struct usb_device *dev = NULL;
718 struct dev_state *ps;
719 int ret;
720
721 ret = -ENOMEM;
722 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
723 if (!ps)
724 goto out_free_ps;
725
726 ret = -ENODEV;
727
728 /* Protect against simultaneous removal or release */
729 mutex_lock(&usbfs_mutex);
730
731 /* usbdev device-node */
732 if (imajor(inode) == USB_DEVICE_MAJOR)
733 dev = usbdev_lookup_by_devt(inode->i_rdev);
734
735 mutex_unlock(&usbfs_mutex);
736
737 if (!dev)
738 goto out_free_ps;
739
740 usb_lock_device(dev);
741 if (dev->state == USB_STATE_NOTATTACHED)
742 goto out_unlock_device;
743
744 ret = usb_autoresume_device(dev);
745 if (ret)
746 goto out_unlock_device;
747
748 ps->dev = dev;
749 ps->file = file;
750 spin_lock_init(&ps->lock);
751 INIT_LIST_HEAD(&ps->list);
752 INIT_LIST_HEAD(&ps->async_pending);
753 INIT_LIST_HEAD(&ps->async_completed);
754 init_waitqueue_head(&ps->wait);
755 ps->discsignr = 0;
756 ps->disc_pid = get_pid(task_pid(current));
757 ps->cred = get_current_cred();
758 ps->disccontext = NULL;
759 ps->ifclaimed = 0;
760 security_task_getsecid(current, &ps->secid);
761 smp_wmb();
762 list_add_tail(&ps->list, &dev->filelist);
763 file->private_data = ps;
764 usb_unlock_device(dev);
765 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
766 current->comm);
767 return ret;
768
769 out_unlock_device:
770 usb_unlock_device(dev);
771 usb_put_dev(dev);
772 out_free_ps:
773 kfree(ps);
774 return ret;
775}
776
777static int usbdev_release(struct inode *inode, struct file *file)
778{
779 struct dev_state *ps = file->private_data;
780 struct usb_device *dev = ps->dev;
781 unsigned int ifnum;
782 struct async *as;
783
784 usb_lock_device(dev);
785 usb_hub_release_all_ports(dev, ps);
786
787 list_del_init(&ps->list);
788
789 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
790 ifnum++) {
791 if (test_bit(ifnum, &ps->ifclaimed))
792 releaseintf(ps, ifnum);
793 }
794 destroy_all_async(ps);
795 usb_autosuspend_device(dev);
796 usb_unlock_device(dev);
797 usb_put_dev(dev);
798 put_pid(ps->disc_pid);
799 put_cred(ps->cred);
800
801 as = async_getcompleted(ps);
802 while (as) {
803 free_async(as);
804 as = async_getcompleted(ps);
805 }
806 kfree(ps);
807 return 0;
808}
809
810static int proc_control(struct dev_state *ps, void __user *arg)
811{
812 struct usb_device *dev = ps->dev;
813 struct usbdevfs_ctrltransfer ctrl;
814 unsigned int tmo;
815 unsigned char *tbuf;
816 unsigned wLength;
817 int i, pipe, ret;
818
819 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
820 return -EFAULT;
821 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
822 ctrl.wIndex);
823 if (ret)
824 return ret;
825 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
826 if (wLength > PAGE_SIZE)
827 return -EINVAL;
828 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
829 sizeof(struct usb_ctrlrequest));
830 if (ret)
831 return ret;
832 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
833 if (!tbuf) {
834 ret = -ENOMEM;
835 goto done;
836 }
837 tmo = ctrl.timeout;
838 snoop(&dev->dev, "control urb: bRequestType=%02x "
839 "bRequest=%02x wValue=%04x "
840 "wIndex=%04x wLength=%04x\n",
841 ctrl.bRequestType, ctrl.bRequest,
842 __le16_to_cpup(&ctrl.wValue),
843 __le16_to_cpup(&ctrl.wIndex),
844 __le16_to_cpup(&ctrl.wLength));
845 if (ctrl.bRequestType & 0x80) {
846 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
847 ctrl.wLength)) {
848 ret = -EINVAL;
849 goto done;
850 }
851 pipe = usb_rcvctrlpipe(dev, 0);
852 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
853
854 usb_unlock_device(dev);
855 i = usb_control_msg(dev, pipe, ctrl.bRequest,
856 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
857 tbuf, ctrl.wLength, tmo);
858 usb_lock_device(dev);
859 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
860 tbuf, max(i, 0));
861 if ((i > 0) && ctrl.wLength) {
862 if (copy_to_user(ctrl.data, tbuf, i)) {
863 ret = -EFAULT;
864 goto done;
865 }
866 }
867 } else {
868 if (ctrl.wLength) {
869 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
870 ret = -EFAULT;
871 goto done;
872 }
873 }
874 pipe = usb_sndctrlpipe(dev, 0);
875 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
876 tbuf, ctrl.wLength);
877
878 usb_unlock_device(dev);
879 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
880 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
881 tbuf, ctrl.wLength, tmo);
882 usb_lock_device(dev);
883 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
884 }
885 if (i < 0 && i != -EPIPE) {
886 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
887 "failed cmd %s rqt %u rq %u len %u ret %d\n",
888 current->comm, ctrl.bRequestType, ctrl.bRequest,
889 ctrl.wLength, i);
890 }
891 ret = i;
892 done:
893 free_page((unsigned long) tbuf);
894 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
895 sizeof(struct usb_ctrlrequest));
896 return ret;
897}
898
899static int proc_bulk(struct dev_state *ps, void __user *arg)
900{
901 struct usb_device *dev = ps->dev;
902 struct usbdevfs_bulktransfer bulk;
903 unsigned int tmo, len1, pipe;
904 int len2;
905 unsigned char *tbuf;
906 int i, ret;
907
908 if (copy_from_user(&bulk, arg, sizeof(bulk)))
909 return -EFAULT;
910 ret = findintfep(ps->dev, bulk.ep);
911 if (ret < 0)
912 return ret;
913 ret = checkintf(ps, ret);
914 if (ret)
915 return ret;
916 if (bulk.ep & USB_DIR_IN)
917 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
918 else
919 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
920 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
921 return -EINVAL;
922 len1 = bulk.len;
923 if (len1 >= USBFS_XFER_MAX)
924 return -EINVAL;
925 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
926 if (ret)
927 return ret;
928 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
929 ret = -ENOMEM;
930 goto done;
931 }
932 tmo = bulk.timeout;
933 if (bulk.ep & 0x80) {
934 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
935 ret = -EINVAL;
936 goto done;
937 }
938 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
939
940 usb_unlock_device(dev);
941 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
942 usb_lock_device(dev);
943 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
944
945 if (!i && len2) {
946 if (copy_to_user(bulk.data, tbuf, len2)) {
947 ret = -EFAULT;
948 goto done;
949 }
950 }
951 } else {
952 if (len1) {
953 if (copy_from_user(tbuf, bulk.data, len1)) {
954 ret = -EFAULT;
955 goto done;
956 }
957 }
958 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
959
960 usb_unlock_device(dev);
961 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
962 usb_lock_device(dev);
963 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
964 }
965 ret = (i < 0 ? i : len2);
966 done:
967 kfree(tbuf);
968 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
969 return ret;
970}
971
972static int proc_resetep(struct dev_state *ps, void __user *arg)
973{
974 unsigned int ep;
975 int ret;
976
977 if (get_user(ep, (unsigned int __user *)arg))
978 return -EFAULT;
979 ret = findintfep(ps->dev, ep);
980 if (ret < 0)
981 return ret;
982 ret = checkintf(ps, ret);
983 if (ret)
984 return ret;
985 usb_reset_endpoint(ps->dev, ep);
986 return 0;
987}
988
989static int proc_clearhalt(struct dev_state *ps, void __user *arg)
990{
991 unsigned int ep;
992 int pipe;
993 int ret;
994
995 if (get_user(ep, (unsigned int __user *)arg))
996 return -EFAULT;
997 ret = findintfep(ps->dev, ep);
998 if (ret < 0)
999 return ret;
1000 ret = checkintf(ps, ret);
1001 if (ret)
1002 return ret;
1003 if (ep & USB_DIR_IN)
1004 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1005 else
1006 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1007
1008 return usb_clear_halt(ps->dev, pipe);
1009}
1010
1011static int proc_getdriver(struct dev_state *ps, void __user *arg)
1012{
1013 struct usbdevfs_getdriver gd;
1014 struct usb_interface *intf;
1015 int ret;
1016
1017 if (copy_from_user(&gd, arg, sizeof(gd)))
1018 return -EFAULT;
1019 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1020 if (!intf || !intf->dev.driver)
1021 ret = -ENODATA;
1022 else {
1023 strncpy(gd.driver, intf->dev.driver->name,
1024 sizeof(gd.driver));
1025 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1026 }
1027 return ret;
1028}
1029
1030static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1031{
1032 struct usbdevfs_connectinfo ci = {
1033 .devnum = ps->dev->devnum,
1034 .slow = ps->dev->speed == USB_SPEED_LOW
1035 };
1036
1037 if (copy_to_user(arg, &ci, sizeof(ci)))
1038 return -EFAULT;
1039 return 0;
1040}
1041
1042static int proc_resetdevice(struct dev_state *ps)
1043{
1044 return usb_reset_device(ps->dev);
1045}
1046
1047static int proc_setintf(struct dev_state *ps, void __user *arg)
1048{
1049 struct usbdevfs_setinterface setintf;
1050 int ret;
1051
1052 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1053 return -EFAULT;
1054 if ((ret = checkintf(ps, setintf.interface)))
1055 return ret;
1056 return usb_set_interface(ps->dev, setintf.interface,
1057 setintf.altsetting);
1058}
1059
1060static int proc_setconfig(struct dev_state *ps, void __user *arg)
1061{
1062 int u;
1063 int status = 0;
1064 struct usb_host_config *actconfig;
1065
1066 if (get_user(u, (int __user *)arg))
1067 return -EFAULT;
1068
1069 actconfig = ps->dev->actconfig;
1070
1071 /* Don't touch the device if any interfaces are claimed.
1072 * It could interfere with other drivers' operations, and if
1073 * an interface is claimed by usbfs it could easily deadlock.
1074 */
1075 if (actconfig) {
1076 int i;
1077
1078 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1079 if (usb_interface_claimed(actconfig->interface[i])) {
1080 dev_warn(&ps->dev->dev,
1081 "usbfs: interface %d claimed by %s "
1082 "while '%s' sets config #%d\n",
1083 actconfig->interface[i]
1084 ->cur_altsetting
1085 ->desc.bInterfaceNumber,
1086 actconfig->interface[i]
1087 ->dev.driver->name,
1088 current->comm, u);
1089 status = -EBUSY;
1090 break;
1091 }
1092 }
1093 }
1094
1095 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1096 * so avoid usb_set_configuration()'s kick to sysfs
1097 */
1098 if (status == 0) {
1099 if (actconfig && actconfig->desc.bConfigurationValue == u)
1100 status = usb_reset_configuration(ps->dev);
1101 else
1102 status = usb_set_configuration(ps->dev, u);
1103 }
1104
1105 return status;
1106}
1107
1108static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1109 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1110 void __user *arg)
1111{
1112 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1113 struct usb_host_endpoint *ep;
1114 struct async *as = NULL;
1115 struct usb_ctrlrequest *dr = NULL;
1116 unsigned int u, totlen, isofrmlen;
1117 int ret, ifnum = -1;
1118 int is_in;
1119
1120 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1121 USBDEVFS_URB_SHORT_NOT_OK |
1122 USBDEVFS_URB_BULK_CONTINUATION |
1123 USBDEVFS_URB_NO_FSBR |
1124 USBDEVFS_URB_ZERO_PACKET |
1125 USBDEVFS_URB_NO_INTERRUPT))
1126 return -EINVAL;
1127 if (uurb->buffer_length > 0 && !uurb->buffer)
1128 return -EINVAL;
1129 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1130 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1131 ifnum = findintfep(ps->dev, uurb->endpoint);
1132 if (ifnum < 0)
1133 return ifnum;
1134 ret = checkintf(ps, ifnum);
1135 if (ret)
1136 return ret;
1137 }
1138 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1139 is_in = 1;
1140 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1141 } else {
1142 is_in = 0;
1143 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1144 }
1145 if (!ep)
1146 return -ENOENT;
1147
1148 u = 0;
1149 switch(uurb->type) {
1150 case USBDEVFS_URB_TYPE_CONTROL:
1151 if (!usb_endpoint_xfer_control(&ep->desc))
1152 return -EINVAL;
1153 /* min 8 byte setup packet */
1154 if (uurb->buffer_length < 8)
1155 return -EINVAL;
1156 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1157 if (!dr)
1158 return -ENOMEM;
1159 if (copy_from_user(dr, uurb->buffer, 8)) {
1160 ret = -EFAULT;
1161 goto error;
1162 }
1163 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1164 ret = -EINVAL;
1165 goto error;
1166 }
1167 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1168 le16_to_cpup(&dr->wIndex));
1169 if (ret)
1170 goto error;
1171 uurb->number_of_packets = 0;
1172 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1173 uurb->buffer += 8;
1174 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1175 is_in = 1;
1176 uurb->endpoint |= USB_DIR_IN;
1177 } else {
1178 is_in = 0;
1179 uurb->endpoint &= ~USB_DIR_IN;
1180 }
1181 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1182 "bRequest=%02x wValue=%04x "
1183 "wIndex=%04x wLength=%04x\n",
1184 dr->bRequestType, dr->bRequest,
1185 __le16_to_cpup(&dr->wValue),
1186 __le16_to_cpup(&dr->wIndex),
1187 __le16_to_cpup(&dr->wLength));
1188 u = sizeof(struct usb_ctrlrequest);
1189 break;
1190
1191 case USBDEVFS_URB_TYPE_BULK:
1192 switch (usb_endpoint_type(&ep->desc)) {
1193 case USB_ENDPOINT_XFER_CONTROL:
1194 case USB_ENDPOINT_XFER_ISOC:
1195 return -EINVAL;
1196 case USB_ENDPOINT_XFER_INT:
1197 /* allow single-shot interrupt transfers */
1198 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1199 goto interrupt_urb;
1200 }
1201 uurb->number_of_packets = 0;
1202 break;
1203
1204 case USBDEVFS_URB_TYPE_INTERRUPT:
1205 if (!usb_endpoint_xfer_int(&ep->desc))
1206 return -EINVAL;
1207 interrupt_urb:
1208 uurb->number_of_packets = 0;
1209 break;
1210
1211 case USBDEVFS_URB_TYPE_ISO:
1212 /* arbitrary limit */
1213 if (uurb->number_of_packets < 1 ||
1214 uurb->number_of_packets > 128)
1215 return -EINVAL;
1216 if (!usb_endpoint_xfer_isoc(&ep->desc))
1217 return -EINVAL;
1218 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1219 uurb->number_of_packets;
1220 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1221 return -ENOMEM;
1222 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1223 ret = -EFAULT;
1224 goto error;
1225 }
1226 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1227 /* arbitrary limit,
1228 * sufficient for USB 2.0 high-bandwidth iso */
1229 if (isopkt[u].length > 8192) {
1230 ret = -EINVAL;
1231 goto error;
1232 }
1233 totlen += isopkt[u].length;
1234 }
1235 u *= sizeof(struct usb_iso_packet_descriptor);
1236 uurb->buffer_length = totlen;
1237 break;
1238
1239 default:
1240 return -EINVAL;
1241 }
1242
1243 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1244 ret = -EINVAL;
1245 goto error;
1246 }
1247 if (uurb->buffer_length > 0 &&
1248 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1249 uurb->buffer, uurb->buffer_length)) {
1250 ret = -EFAULT;
1251 goto error;
1252 }
1253 as = alloc_async(uurb->number_of_packets);
1254 if (!as) {
1255 ret = -ENOMEM;
1256 goto error;
1257 }
1258 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length;
1259 ret = usbfs_increase_memory_usage(u);
1260 if (ret)
1261 goto error;
1262 as->mem_usage = u;
1263
1264 if (uurb->buffer_length > 0) {
1265 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1266 GFP_KERNEL);
1267 if (!as->urb->transfer_buffer) {
1268 ret = -ENOMEM;
1269 goto error;
1270 }
1271 /* Isochronous input data may end up being discontiguous
1272 * if some of the packets are short. Clear the buffer so
1273 * that the gaps don't leak kernel data to userspace.
1274 */
1275 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1276 memset(as->urb->transfer_buffer, 0,
1277 uurb->buffer_length);
1278 }
1279 as->urb->dev = ps->dev;
1280 as->urb->pipe = (uurb->type << 30) |
1281 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1282 (uurb->endpoint & USB_DIR_IN);
1283
1284 /* This tedious sequence is necessary because the URB_* flags
1285 * are internal to the kernel and subject to change, whereas
1286 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1287 */
1288 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1289 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1290 u |= URB_ISO_ASAP;
1291 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1292 u |= URB_SHORT_NOT_OK;
1293 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1294 u |= URB_NO_FSBR;
1295 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1296 u |= URB_ZERO_PACKET;
1297 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1298 u |= URB_NO_INTERRUPT;
1299 as->urb->transfer_flags = u;
1300
1301 as->urb->transfer_buffer_length = uurb->buffer_length;
1302 as->urb->setup_packet = (unsigned char *)dr;
1303 dr = NULL;
1304 as->urb->start_frame = uurb->start_frame;
1305 as->urb->number_of_packets = uurb->number_of_packets;
1306 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1307 ps->dev->speed == USB_SPEED_HIGH)
1308 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1309 else
1310 as->urb->interval = ep->desc.bInterval;
1311 as->urb->context = as;
1312 as->urb->complete = async_completed;
1313 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1314 as->urb->iso_frame_desc[u].offset = totlen;
1315 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1316 totlen += isopkt[u].length;
1317 }
1318 kfree(isopkt);
1319 isopkt = NULL;
1320 as->ps = ps;
1321 as->userurb = arg;
1322 if (is_in && uurb->buffer_length > 0)
1323 as->userbuffer = uurb->buffer;
1324 else
1325 as->userbuffer = NULL;
1326 as->signr = uurb->signr;
1327 as->ifnum = ifnum;
1328 as->pid = get_pid(task_pid(current));
1329 as->cred = get_current_cred();
1330 security_task_getsecid(current, &as->secid);
1331 if (!is_in && uurb->buffer_length > 0) {
1332 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1333 uurb->buffer_length)) {
1334 ret = -EFAULT;
1335 goto error;
1336 }
1337 }
1338 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1339 as->urb->transfer_buffer_length, 0, SUBMIT,
1340 is_in ? NULL : as->urb->transfer_buffer,
1341 uurb->buffer_length);
1342 async_newpending(as);
1343
1344 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1345 spin_lock_irq(&ps->lock);
1346
1347 /* Not exactly the endpoint address; the direction bit is
1348 * shifted to the 0x10 position so that the value will be
1349 * between 0 and 31.
1350 */
1351 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1352 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1353 >> 3);
1354
1355 /* If this bulk URB is the start of a new transfer, re-enable
1356 * the endpoint. Otherwise mark it as a continuation URB.
1357 */
1358 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1359 as->bulk_status = AS_CONTINUATION;
1360 else
1361 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1362
1363 /* Don't accept continuation URBs if the endpoint is
1364 * disabled because of an earlier error.
1365 */
1366 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1367 ret = -EREMOTEIO;
1368 else
1369 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1370 spin_unlock_irq(&ps->lock);
1371 } else {
1372 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1373 }
1374
1375 if (ret) {
1376 dev_printk(KERN_DEBUG, &ps->dev->dev,
1377 "usbfs: usb_submit_urb returned %d\n", ret);
1378 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1379 0, ret, COMPLETE, NULL, 0);
1380 async_removepending(as);
1381 goto error;
1382 }
1383 return 0;
1384
1385 error:
1386 kfree(isopkt);
1387 kfree(dr);
1388 if (as)
1389 free_async(as);
1390 return ret;
1391}
1392
1393static int proc_submiturb(struct dev_state *ps, void __user *arg)
1394{
1395 struct usbdevfs_urb uurb;
1396
1397 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1398 return -EFAULT;
1399
1400 return proc_do_submiturb(ps, &uurb,
1401 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1402 arg);
1403}
1404
1405static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1406{
1407 struct urb *urb;
1408 struct async *as;
1409 unsigned long flags;
1410
1411 spin_lock_irqsave(&ps->lock, flags);
1412 as = async_getpending(ps, arg);
1413 if (!as) {
1414 spin_unlock_irqrestore(&ps->lock, flags);
1415 return -EINVAL;
1416 }
1417
1418 urb = as->urb;
1419 usb_get_urb(urb);
1420 spin_unlock_irqrestore(&ps->lock, flags);
1421
1422 usb_kill_urb(urb);
1423 usb_put_urb(urb);
1424
1425 return 0;
1426}
1427
1428static int processcompl(struct async *as, void __user * __user *arg)
1429{
1430 struct urb *urb = as->urb;
1431 struct usbdevfs_urb __user *userurb = as->userurb;
1432 void __user *addr = as->userurb;
1433 unsigned int i;
1434
1435 if (as->userbuffer && urb->actual_length) {
1436 if (urb->number_of_packets > 0) /* Isochronous */
1437 i = urb->transfer_buffer_length;
1438 else /* Non-Isoc */
1439 i = urb->actual_length;
1440 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1441 goto err_out;
1442 }
1443 if (put_user(as->status, &userurb->status))
1444 goto err_out;
1445 if (put_user(urb->actual_length, &userurb->actual_length))
1446 goto err_out;
1447 if (put_user(urb->error_count, &userurb->error_count))
1448 goto err_out;
1449
1450 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1451 for (i = 0; i < urb->number_of_packets; i++) {
1452 if (put_user(urb->iso_frame_desc[i].actual_length,
1453 &userurb->iso_frame_desc[i].actual_length))
1454 goto err_out;
1455 if (put_user(urb->iso_frame_desc[i].status,
1456 &userurb->iso_frame_desc[i].status))
1457 goto err_out;
1458 }
1459 }
1460
1461 if (put_user(addr, (void __user * __user *)arg))
1462 return -EFAULT;
1463 return 0;
1464
1465err_out:
1466 return -EFAULT;
1467}
1468
1469static struct async *reap_as(struct dev_state *ps)
1470{
1471 DECLARE_WAITQUEUE(wait, current);
1472 struct async *as = NULL;
1473 struct usb_device *dev = ps->dev;
1474
1475 add_wait_queue(&ps->wait, &wait);
1476 for (;;) {
1477 __set_current_state(TASK_INTERRUPTIBLE);
1478 as = async_getcompleted(ps);
1479 if (as)
1480 break;
1481 if (signal_pending(current))
1482 break;
1483 usb_unlock_device(dev);
1484 schedule();
1485 usb_lock_device(dev);
1486 }
1487 remove_wait_queue(&ps->wait, &wait);
1488 set_current_state(TASK_RUNNING);
1489 return as;
1490}
1491
1492static int proc_reapurb(struct dev_state *ps, void __user *arg)
1493{
1494 struct async *as = reap_as(ps);
1495 if (as) {
1496 int retval = processcompl(as, (void __user * __user *)arg);
1497 free_async(as);
1498 return retval;
1499 }
1500 if (signal_pending(current))
1501 return -EINTR;
1502 return -EIO;
1503}
1504
1505static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1506{
1507 int retval;
1508 struct async *as;
1509
1510 as = async_getcompleted(ps);
1511 retval = -EAGAIN;
1512 if (as) {
1513 retval = processcompl(as, (void __user * __user *)arg);
1514 free_async(as);
1515 }
1516 return retval;
1517}
1518
1519#ifdef CONFIG_COMPAT
1520static int proc_control_compat(struct dev_state *ps,
1521 struct usbdevfs_ctrltransfer32 __user *p32)
1522{
1523 struct usbdevfs_ctrltransfer __user *p;
1524 __u32 udata;
1525 p = compat_alloc_user_space(sizeof(*p));
1526 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1527 get_user(udata, &p32->data) ||
1528 put_user(compat_ptr(udata), &p->data))
1529 return -EFAULT;
1530 return proc_control(ps, p);
1531}
1532
1533static int proc_bulk_compat(struct dev_state *ps,
1534 struct usbdevfs_bulktransfer32 __user *p32)
1535{
1536 struct usbdevfs_bulktransfer __user *p;
1537 compat_uint_t n;
1538 compat_caddr_t addr;
1539
1540 p = compat_alloc_user_space(sizeof(*p));
1541
1542 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1543 get_user(n, &p32->len) || put_user(n, &p->len) ||
1544 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1545 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1546 return -EFAULT;
1547
1548 return proc_bulk(ps, p);
1549}
1550static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1551{
1552 struct usbdevfs_disconnectsignal32 ds;
1553
1554 if (copy_from_user(&ds, arg, sizeof(ds)))
1555 return -EFAULT;
1556 ps->discsignr = ds.signr;
1557 ps->disccontext = compat_ptr(ds.context);
1558 return 0;
1559}
1560
1561static int get_urb32(struct usbdevfs_urb *kurb,
1562 struct usbdevfs_urb32 __user *uurb)
1563{
1564 __u32 uptr;
1565 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1566 __get_user(kurb->type, &uurb->type) ||
1567 __get_user(kurb->endpoint, &uurb->endpoint) ||
1568 __get_user(kurb->status, &uurb->status) ||
1569 __get_user(kurb->flags, &uurb->flags) ||
1570 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1571 __get_user(kurb->actual_length, &uurb->actual_length) ||
1572 __get_user(kurb->start_frame, &uurb->start_frame) ||
1573 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1574 __get_user(kurb->error_count, &uurb->error_count) ||
1575 __get_user(kurb->signr, &uurb->signr))
1576 return -EFAULT;
1577
1578 if (__get_user(uptr, &uurb->buffer))
1579 return -EFAULT;
1580 kurb->buffer = compat_ptr(uptr);
1581 if (__get_user(uptr, &uurb->usercontext))
1582 return -EFAULT;
1583 kurb->usercontext = compat_ptr(uptr);
1584
1585 return 0;
1586}
1587
1588static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1589{
1590 struct usbdevfs_urb uurb;
1591
1592 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1593 return -EFAULT;
1594
1595 return proc_do_submiturb(ps, &uurb,
1596 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1597 arg);
1598}
1599
1600static int processcompl_compat(struct async *as, void __user * __user *arg)
1601{
1602 struct urb *urb = as->urb;
1603 struct usbdevfs_urb32 __user *userurb = as->userurb;
1604 void __user *addr = as->userurb;
1605 unsigned int i;
1606
1607 if (as->userbuffer && urb->actual_length) {
1608 if (urb->number_of_packets > 0) /* Isochronous */
1609 i = urb->transfer_buffer_length;
1610 else /* Non-Isoc */
1611 i = urb->actual_length;
1612 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1613 return -EFAULT;
1614 }
1615 if (put_user(as->status, &userurb->status))
1616 return -EFAULT;
1617 if (put_user(urb->actual_length, &userurb->actual_length))
1618 return -EFAULT;
1619 if (put_user(urb->error_count, &userurb->error_count))
1620 return -EFAULT;
1621
1622 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1623 for (i = 0; i < urb->number_of_packets; i++) {
1624 if (put_user(urb->iso_frame_desc[i].actual_length,
1625 &userurb->iso_frame_desc[i].actual_length))
1626 return -EFAULT;
1627 if (put_user(urb->iso_frame_desc[i].status,
1628 &userurb->iso_frame_desc[i].status))
1629 return -EFAULT;
1630 }
1631 }
1632
1633 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1634 return -EFAULT;
1635 return 0;
1636}
1637
1638static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1639{
1640 struct async *as = reap_as(ps);
1641 if (as) {
1642 int retval = processcompl_compat(as, (void __user * __user *)arg);
1643 free_async(as);
1644 return retval;
1645 }
1646 if (signal_pending(current))
1647 return -EINTR;
1648 return -EIO;
1649}
1650
1651static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1652{
1653 int retval;
1654 struct async *as;
1655
1656 retval = -EAGAIN;
1657 as = async_getcompleted(ps);
1658 if (as) {
1659 retval = processcompl_compat(as, (void __user * __user *)arg);
1660 free_async(as);
1661 }
1662 return retval;
1663}
1664
1665
1666#endif
1667
1668static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1669{
1670 struct usbdevfs_disconnectsignal ds;
1671
1672 if (copy_from_user(&ds, arg, sizeof(ds)))
1673 return -EFAULT;
1674 ps->discsignr = ds.signr;
1675 ps->disccontext = ds.context;
1676 return 0;
1677}
1678
1679static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1680{
1681 unsigned int ifnum;
1682
1683 if (get_user(ifnum, (unsigned int __user *)arg))
1684 return -EFAULT;
1685 return claimintf(ps, ifnum);
1686}
1687
1688static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1689{
1690 unsigned int ifnum;
1691 int ret;
1692
1693 if (get_user(ifnum, (unsigned int __user *)arg))
1694 return -EFAULT;
1695 if ((ret = releaseintf(ps, ifnum)) < 0)
1696 return ret;
1697 destroy_async_on_interface (ps, ifnum);
1698 return 0;
1699}
1700
1701static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1702{
1703 int size;
1704 void *buf = NULL;
1705 int retval = 0;
1706 struct usb_interface *intf = NULL;
1707 struct usb_driver *driver = NULL;
1708
1709 /* alloc buffer */
1710 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1711 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1712 return -ENOMEM;
1713 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1714 if (copy_from_user(buf, ctl->data, size)) {
1715 kfree(buf);
1716 return -EFAULT;
1717 }
1718 } else {
1719 memset(buf, 0, size);
1720 }
1721 }
1722
1723 if (!connected(ps)) {
1724 kfree(buf);
1725 return -ENODEV;
1726 }
1727
1728 if (ps->dev->state != USB_STATE_CONFIGURED)
1729 retval = -EHOSTUNREACH;
1730 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1731 retval = -EINVAL;
1732 else switch (ctl->ioctl_code) {
1733
1734 /* disconnect kernel driver from interface */
1735 case USBDEVFS_DISCONNECT:
1736 if (intf->dev.driver) {
1737 driver = to_usb_driver(intf->dev.driver);
1738 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1739 usb_driver_release_interface(driver, intf);
1740 } else
1741 retval = -ENODATA;
1742 break;
1743
1744 /* let kernel drivers try to (re)bind to the interface */
1745 case USBDEVFS_CONNECT:
1746 if (!intf->dev.driver)
1747 retval = device_attach(&intf->dev);
1748 else
1749 retval = -EBUSY;
1750 break;
1751
1752 /* talk directly to the interface's driver */
1753 default:
1754 if (intf->dev.driver)
1755 driver = to_usb_driver(intf->dev.driver);
1756 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1757 retval = -ENOTTY;
1758 } else {
1759 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1760 if (retval == -ENOIOCTLCMD)
1761 retval = -ENOTTY;
1762 }
1763 }
1764
1765 /* cleanup and return */
1766 if (retval >= 0
1767 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1768 && size > 0
1769 && copy_to_user(ctl->data, buf, size) != 0)
1770 retval = -EFAULT;
1771
1772 kfree(buf);
1773 return retval;
1774}
1775
1776static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1777{
1778 struct usbdevfs_ioctl ctrl;
1779
1780 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1781 return -EFAULT;
1782 return proc_ioctl(ps, &ctrl);
1783}
1784
1785#ifdef CONFIG_COMPAT
1786static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1787{
1788 struct usbdevfs_ioctl32 __user *uioc;
1789 struct usbdevfs_ioctl ctrl;
1790 u32 udata;
1791
1792 uioc = compat_ptr((long)arg);
1793 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1794 __get_user(ctrl.ifno, &uioc->ifno) ||
1795 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1796 __get_user(udata, &uioc->data))
1797 return -EFAULT;
1798 ctrl.data = compat_ptr(udata);
1799
1800 return proc_ioctl(ps, &ctrl);
1801}
1802#endif
1803
1804static int proc_claim_port(struct dev_state *ps, void __user *arg)
1805{
1806 unsigned portnum;
1807 int rc;
1808
1809 if (get_user(portnum, (unsigned __user *) arg))
1810 return -EFAULT;
1811 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1812 if (rc == 0)
1813 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1814 portnum, task_pid_nr(current), current->comm);
1815 return rc;
1816}
1817
1818static int proc_release_port(struct dev_state *ps, void __user *arg)
1819{
1820 unsigned portnum;
1821
1822 if (get_user(portnum, (unsigned __user *) arg))
1823 return -EFAULT;
1824 return usb_hub_release_port(ps->dev, portnum, ps);
1825}
1826
1827/*
1828 * NOTE: All requests here that have interface numbers as parameters
1829 * are assuming that somehow the configuration has been prevented from
1830 * changing. But there's no mechanism to ensure that...
1831 */
1832static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1833 void __user *p)
1834{
1835 struct dev_state *ps = file->private_data;
1836 struct inode *inode = file->f_path.dentry->d_inode;
1837 struct usb_device *dev = ps->dev;
1838 int ret = -ENOTTY;
1839
1840 if (!(file->f_mode & FMODE_WRITE))
1841 return -EPERM;
1842
1843 usb_lock_device(dev);
1844 if (!connected(ps)) {
1845 usb_unlock_device(dev);
1846 return -ENODEV;
1847 }
1848
1849 switch (cmd) {
1850 case USBDEVFS_CONTROL:
1851 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1852 ret = proc_control(ps, p);
1853 if (ret >= 0)
1854 inode->i_mtime = CURRENT_TIME;
1855 break;
1856
1857 case USBDEVFS_BULK:
1858 snoop(&dev->dev, "%s: BULK\n", __func__);
1859 ret = proc_bulk(ps, p);
1860 if (ret >= 0)
1861 inode->i_mtime = CURRENT_TIME;
1862 break;
1863
1864 case USBDEVFS_RESETEP:
1865 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1866 ret = proc_resetep(ps, p);
1867 if (ret >= 0)
1868 inode->i_mtime = CURRENT_TIME;
1869 break;
1870
1871 case USBDEVFS_RESET:
1872 snoop(&dev->dev, "%s: RESET\n", __func__);
1873 ret = proc_resetdevice(ps);
1874 break;
1875
1876 case USBDEVFS_CLEAR_HALT:
1877 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1878 ret = proc_clearhalt(ps, p);
1879 if (ret >= 0)
1880 inode->i_mtime = CURRENT_TIME;
1881 break;
1882
1883 case USBDEVFS_GETDRIVER:
1884 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1885 ret = proc_getdriver(ps, p);
1886 break;
1887
1888 case USBDEVFS_CONNECTINFO:
1889 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1890 ret = proc_connectinfo(ps, p);
1891 break;
1892
1893 case USBDEVFS_SETINTERFACE:
1894 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1895 ret = proc_setintf(ps, p);
1896 break;
1897
1898 case USBDEVFS_SETCONFIGURATION:
1899 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1900 ret = proc_setconfig(ps, p);
1901 break;
1902
1903 case USBDEVFS_SUBMITURB:
1904 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1905 ret = proc_submiturb(ps, p);
1906 if (ret >= 0)
1907 inode->i_mtime = CURRENT_TIME;
1908 break;
1909
1910#ifdef CONFIG_COMPAT
1911 case USBDEVFS_CONTROL32:
1912 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1913 ret = proc_control_compat(ps, p);
1914 if (ret >= 0)
1915 inode->i_mtime = CURRENT_TIME;
1916 break;
1917
1918 case USBDEVFS_BULK32:
1919 snoop(&dev->dev, "%s: BULK32\n", __func__);
1920 ret = proc_bulk_compat(ps, p);
1921 if (ret >= 0)
1922 inode->i_mtime = CURRENT_TIME;
1923 break;
1924
1925 case USBDEVFS_DISCSIGNAL32:
1926 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1927 ret = proc_disconnectsignal_compat(ps, p);
1928 break;
1929
1930 case USBDEVFS_SUBMITURB32:
1931 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1932 ret = proc_submiturb_compat(ps, p);
1933 if (ret >= 0)
1934 inode->i_mtime = CURRENT_TIME;
1935 break;
1936
1937 case USBDEVFS_REAPURB32:
1938 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1939 ret = proc_reapurb_compat(ps, p);
1940 break;
1941
1942 case USBDEVFS_REAPURBNDELAY32:
1943 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1944 ret = proc_reapurbnonblock_compat(ps, p);
1945 break;
1946
1947 case USBDEVFS_IOCTL32:
1948 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1949 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1950 break;
1951#endif
1952
1953 case USBDEVFS_DISCARDURB:
1954 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1955 ret = proc_unlinkurb(ps, p);
1956 break;
1957
1958 case USBDEVFS_REAPURB:
1959 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1960 ret = proc_reapurb(ps, p);
1961 break;
1962
1963 case USBDEVFS_REAPURBNDELAY:
1964 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1965 ret = proc_reapurbnonblock(ps, p);
1966 break;
1967
1968 case USBDEVFS_DISCSIGNAL:
1969 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1970 ret = proc_disconnectsignal(ps, p);
1971 break;
1972
1973 case USBDEVFS_CLAIMINTERFACE:
1974 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1975 ret = proc_claiminterface(ps, p);
1976 break;
1977
1978 case USBDEVFS_RELEASEINTERFACE:
1979 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1980 ret = proc_releaseinterface(ps, p);
1981 break;
1982
1983 case USBDEVFS_IOCTL:
1984 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1985 ret = proc_ioctl_default(ps, p);
1986 break;
1987
1988 case USBDEVFS_CLAIM_PORT:
1989 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1990 ret = proc_claim_port(ps, p);
1991 break;
1992
1993 case USBDEVFS_RELEASE_PORT:
1994 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1995 ret = proc_release_port(ps, p);
1996 break;
1997 }
1998 usb_unlock_device(dev);
1999 if (ret >= 0)
2000 inode->i_atime = CURRENT_TIME;
2001 return ret;
2002}
2003
2004static long usbdev_ioctl(struct file *file, unsigned int cmd,
2005 unsigned long arg)
2006{
2007 int ret;
2008
2009 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2010
2011 return ret;
2012}
2013
2014#ifdef CONFIG_COMPAT
2015static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2016 unsigned long arg)
2017{
2018 int ret;
2019
2020 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2021
2022 return ret;
2023}
2024#endif
2025
2026/* No kernel lock - fine */
2027static unsigned int usbdev_poll(struct file *file,
2028 struct poll_table_struct *wait)
2029{
2030 struct dev_state *ps = file->private_data;
2031 unsigned int mask = 0;
2032
2033 poll_wait(file, &ps->wait, wait);
2034 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2035 mask |= POLLOUT | POLLWRNORM;
2036 if (!connected(ps))
2037 mask |= POLLERR | POLLHUP;
2038 return mask;
2039}
2040
2041const struct file_operations usbdev_file_operations = {
2042 .owner = THIS_MODULE,
2043 .llseek = usbdev_lseek,
2044 .read = usbdev_read,
2045 .poll = usbdev_poll,
2046 .unlocked_ioctl = usbdev_ioctl,
2047#ifdef CONFIG_COMPAT
2048 .compat_ioctl = usbdev_compat_ioctl,
2049#endif
2050 .open = usbdev_open,
2051 .release = usbdev_release,
2052};
2053
2054static void usbdev_remove(struct usb_device *udev)
2055{
2056 struct dev_state *ps;
2057 struct siginfo sinfo;
2058
2059 while (!list_empty(&udev->filelist)) {
2060 ps = list_entry(udev->filelist.next, struct dev_state, list);
2061 destroy_all_async(ps);
2062 wake_up_all(&ps->wait);
2063 list_del_init(&ps->list);
2064 if (ps->discsignr) {
2065 sinfo.si_signo = ps->discsignr;
2066 sinfo.si_errno = EPIPE;
2067 sinfo.si_code = SI_ASYNCIO;
2068 sinfo.si_addr = ps->disccontext;
2069 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2070 ps->disc_pid, ps->cred, ps->secid);
2071 }
2072 }
2073}
2074
2075static int usbdev_notify(struct notifier_block *self,
2076 unsigned long action, void *dev)
2077{
2078 switch (action) {
2079 case USB_DEVICE_ADD:
2080 break;
2081 case USB_DEVICE_REMOVE:
2082 usbdev_remove(dev);
2083 break;
2084 }
2085 return NOTIFY_OK;
2086}
2087
2088static struct notifier_block usbdev_nb = {
2089 .notifier_call = usbdev_notify,
2090};
2091
2092static struct cdev usb_device_cdev;
2093
2094int __init usb_devio_init(void)
2095{
2096 int retval;
2097
2098 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2099 "usb_device");
2100 if (retval) {
2101 printk(KERN_ERR "Unable to register minors for usb_device\n");
2102 goto out;
2103 }
2104 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2105 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2106 if (retval) {
2107 printk(KERN_ERR "Unable to get usb_device major %d\n",
2108 USB_DEVICE_MAJOR);
2109 goto error_cdev;
2110 }
2111 usb_register_notify(&usbdev_nb);
2112out:
2113 return retval;
2114
2115error_cdev:
2116 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2117 goto out;
2118}
2119
2120void usb_devio_cleanup(void)
2121{
2122 usb_unregister_notify(&usbdev_nb);
2123 cdev_del(&usb_device_cdev);
2124 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2125}