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1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22/*****************************************************************************/
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched/signal.h>
27#include <linux/slab.h>
28#include <linux/signal.h>
29#include <linux/poll.h>
30#include <linux/module.h>
31#include <linux/string.h>
32#include <linux/usb.h>
33#include <linux/usbdevice_fs.h>
34#include <linux/usb/hcd.h> /* for usbcore internals */
35#include <linux/usb/quirks.h>
36#include <linux/cdev.h>
37#include <linux/notifier.h>
38#include <linux/security.h>
39#include <linux/user_namespace.h>
40#include <linux/scatterlist.h>
41#include <linux/uaccess.h>
42#include <linux/dma-mapping.h>
43#include <asm/byteorder.h>
44#include <linux/moduleparam.h>
45
46#include "usb.h"
47
48#ifdef CONFIG_PM
49#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50#else
51#define MAYBE_CAP_SUSPEND 0
52#endif
53
54#define USB_MAXBUS 64
55#define USB_DEVICE_MAX (USB_MAXBUS * 128)
56#define USB_SG_SIZE 16384 /* split-size for large txs */
57
58/* Mutual exclusion for ps->list in resume vs. release and remove */
59static DEFINE_MUTEX(usbfs_mutex);
60
61struct usb_dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 struct list_head memory_list;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 const struct cred *cred;
74 sigval_t disccontext;
75 unsigned long ifclaimed;
76 u32 disabled_bulk_eps;
77 unsigned long interface_allowed_mask;
78 int not_yet_resumed;
79 bool suspend_allowed;
80 bool privileges_dropped;
81};
82
83struct usb_memory {
84 struct list_head memlist;
85 int vma_use_count;
86 int urb_use_count;
87 u32 size;
88 void *mem;
89 dma_addr_t dma_handle;
90 unsigned long vm_start;
91 struct usb_dev_state *ps;
92};
93
94struct async {
95 struct list_head asynclist;
96 struct usb_dev_state *ps;
97 struct pid *pid;
98 const struct cred *cred;
99 unsigned int signr;
100 unsigned int ifnum;
101 void __user *userbuffer;
102 void __user *userurb;
103 sigval_t userurb_sigval;
104 struct urb *urb;
105 struct usb_memory *usbm;
106 unsigned int mem_usage;
107 int status;
108 u8 bulk_addr;
109 u8 bulk_status;
110};
111
112static bool usbfs_snoop;
113module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
114MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116static unsigned usbfs_snoop_max = 65536;
117module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(usbfs_snoop_max,
119 "maximum number of bytes to print while snooping");
120
121#define snoop(dev, format, arg...) \
122 do { \
123 if (usbfs_snoop) \
124 dev_info(dev, format, ## arg); \
125 } while (0)
126
127enum snoop_when {
128 SUBMIT, COMPLETE
129};
130
131#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133/* Limit on the total amount of memory we can allocate for transfers */
134static u32 usbfs_memory_mb = 16;
135module_param(usbfs_memory_mb, uint, 0644);
136MODULE_PARM_DESC(usbfs_memory_mb,
137 "maximum MB allowed for usbfs buffers (0 = no limit)");
138
139/* Hard limit, necessary to avoid arithmetic overflow */
140#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145/* Check whether it's okay to allocate more memory for a transfer */
146static int usbfs_increase_memory_usage(u64 amount)
147{
148 u64 lim, total_mem;
149 unsigned long flags;
150 int ret;
151
152 lim = READ_ONCE(usbfs_memory_mb);
153 lim <<= 20;
154
155 ret = 0;
156 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157 total_mem = usbfs_memory_usage + amount;
158 if (lim > 0 && total_mem > lim)
159 ret = -ENOMEM;
160 else
161 usbfs_memory_usage = total_mem;
162 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164 return ret;
165}
166
167/* Memory for a transfer is being deallocated */
168static void usbfs_decrease_memory_usage(u64 amount)
169{
170 unsigned long flags;
171
172 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173 if (amount > usbfs_memory_usage)
174 usbfs_memory_usage = 0;
175 else
176 usbfs_memory_usage -= amount;
177 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178}
179
180static int connected(struct usb_dev_state *ps)
181{
182 return (!list_empty(&ps->list) &&
183 ps->dev->state != USB_STATE_NOTATTACHED);
184}
185
186static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
187{
188 struct usb_dev_state *ps = usbm->ps;
189 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
190 unsigned long flags;
191
192 spin_lock_irqsave(&ps->lock, flags);
193 --*count;
194 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
195 list_del(&usbm->memlist);
196 spin_unlock_irqrestore(&ps->lock, flags);
197
198 hcd_buffer_free_pages(hcd, usbm->size,
199 usbm->mem, usbm->dma_handle);
200 usbfs_decrease_memory_usage(
201 usbm->size + sizeof(struct usb_memory));
202 kfree(usbm);
203 } else {
204 spin_unlock_irqrestore(&ps->lock, flags);
205 }
206}
207
208static void usbdev_vm_open(struct vm_area_struct *vma)
209{
210 struct usb_memory *usbm = vma->vm_private_data;
211 unsigned long flags;
212
213 spin_lock_irqsave(&usbm->ps->lock, flags);
214 ++usbm->vma_use_count;
215 spin_unlock_irqrestore(&usbm->ps->lock, flags);
216}
217
218static void usbdev_vm_close(struct vm_area_struct *vma)
219{
220 struct usb_memory *usbm = vma->vm_private_data;
221
222 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
223}
224
225static const struct vm_operations_struct usbdev_vm_ops = {
226 .open = usbdev_vm_open,
227 .close = usbdev_vm_close
228};
229
230static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
231{
232 struct usb_memory *usbm = NULL;
233 struct usb_dev_state *ps = file->private_data;
234 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
235 size_t size = vma->vm_end - vma->vm_start;
236 void *mem;
237 unsigned long flags;
238 dma_addr_t dma_handle = DMA_MAPPING_ERROR;
239 int ret;
240
241 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
242 if (ret)
243 goto error;
244
245 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
246 if (!usbm) {
247 ret = -ENOMEM;
248 goto error_decrease_mem;
249 }
250
251 mem = hcd_buffer_alloc_pages(hcd,
252 size, GFP_USER | __GFP_NOWARN, &dma_handle);
253 if (!mem) {
254 ret = -ENOMEM;
255 goto error_free_usbm;
256 }
257
258 memset(mem, 0, size);
259
260 usbm->mem = mem;
261 usbm->dma_handle = dma_handle;
262 usbm->size = size;
263 usbm->ps = ps;
264 usbm->vm_start = vma->vm_start;
265 usbm->vma_use_count = 1;
266 INIT_LIST_HEAD(&usbm->memlist);
267
268 /*
269 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
270 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
271 * whether we are in such cases, and then use remap_pfn_range (or
272 * dma_mmap_coherent) to map normal (or DMA) pages into the user
273 * space, respectively.
274 */
275 if (dma_handle == DMA_MAPPING_ERROR) {
276 if (remap_pfn_range(vma, vma->vm_start,
277 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
278 size, vma->vm_page_prot) < 0) {
279 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
280 return -EAGAIN;
281 }
282 } else {
283 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
284 size)) {
285 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
286 return -EAGAIN;
287 }
288 }
289
290 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
291 vma->vm_ops = &usbdev_vm_ops;
292 vma->vm_private_data = usbm;
293
294 spin_lock_irqsave(&ps->lock, flags);
295 list_add_tail(&usbm->memlist, &ps->memory_list);
296 spin_unlock_irqrestore(&ps->lock, flags);
297
298 return 0;
299
300error_free_usbm:
301 kfree(usbm);
302error_decrease_mem:
303 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
304error:
305 return ret;
306}
307
308static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
309 loff_t *ppos)
310{
311 struct usb_dev_state *ps = file->private_data;
312 struct usb_device *dev = ps->dev;
313 ssize_t ret = 0;
314 unsigned len;
315 loff_t pos;
316 int i;
317
318 pos = *ppos;
319 usb_lock_device(dev);
320 if (!connected(ps)) {
321 ret = -ENODEV;
322 goto err;
323 } else if (pos < 0) {
324 ret = -EINVAL;
325 goto err;
326 }
327
328 if (pos < sizeof(struct usb_device_descriptor)) {
329 /* 18 bytes - fits on the stack */
330 struct usb_device_descriptor temp_desc;
331
332 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
333 le16_to_cpus(&temp_desc.bcdUSB);
334 le16_to_cpus(&temp_desc.idVendor);
335 le16_to_cpus(&temp_desc.idProduct);
336 le16_to_cpus(&temp_desc.bcdDevice);
337
338 len = sizeof(struct usb_device_descriptor) - pos;
339 if (len > nbytes)
340 len = nbytes;
341 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
342 ret = -EFAULT;
343 goto err;
344 }
345
346 *ppos += len;
347 buf += len;
348 nbytes -= len;
349 ret += len;
350 }
351
352 pos = sizeof(struct usb_device_descriptor);
353 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
354 struct usb_config_descriptor *config =
355 (struct usb_config_descriptor *)dev->rawdescriptors[i];
356 unsigned int length = le16_to_cpu(config->wTotalLength);
357
358 if (*ppos < pos + length) {
359
360 /* The descriptor may claim to be longer than it
361 * really is. Here is the actual allocated length. */
362 unsigned alloclen =
363 le16_to_cpu(dev->config[i].desc.wTotalLength);
364
365 len = length - (*ppos - pos);
366 if (len > nbytes)
367 len = nbytes;
368
369 /* Simply don't write (skip over) unallocated parts */
370 if (alloclen > (*ppos - pos)) {
371 alloclen -= (*ppos - pos);
372 if (copy_to_user(buf,
373 dev->rawdescriptors[i] + (*ppos - pos),
374 min(len, alloclen))) {
375 ret = -EFAULT;
376 goto err;
377 }
378 }
379
380 *ppos += len;
381 buf += len;
382 nbytes -= len;
383 ret += len;
384 }
385
386 pos += length;
387 }
388
389err:
390 usb_unlock_device(dev);
391 return ret;
392}
393
394/*
395 * async list handling
396 */
397
398static struct async *alloc_async(unsigned int numisoframes)
399{
400 struct async *as;
401
402 as = kzalloc(sizeof(struct async), GFP_KERNEL);
403 if (!as)
404 return NULL;
405 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
406 if (!as->urb) {
407 kfree(as);
408 return NULL;
409 }
410 return as;
411}
412
413static void free_async(struct async *as)
414{
415 int i;
416
417 put_pid(as->pid);
418 if (as->cred)
419 put_cred(as->cred);
420 for (i = 0; i < as->urb->num_sgs; i++) {
421 if (sg_page(&as->urb->sg[i]))
422 kfree(sg_virt(&as->urb->sg[i]));
423 }
424
425 kfree(as->urb->sg);
426 if (as->usbm == NULL)
427 kfree(as->urb->transfer_buffer);
428 else
429 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
430
431 kfree(as->urb->setup_packet);
432 usb_free_urb(as->urb);
433 usbfs_decrease_memory_usage(as->mem_usage);
434 kfree(as);
435}
436
437static void async_newpending(struct async *as)
438{
439 struct usb_dev_state *ps = as->ps;
440 unsigned long flags;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 list_add_tail(&as->asynclist, &ps->async_pending);
444 spin_unlock_irqrestore(&ps->lock, flags);
445}
446
447static void async_removepending(struct async *as)
448{
449 struct usb_dev_state *ps = as->ps;
450 unsigned long flags;
451
452 spin_lock_irqsave(&ps->lock, flags);
453 list_del_init(&as->asynclist);
454 spin_unlock_irqrestore(&ps->lock, flags);
455}
456
457static struct async *async_getcompleted(struct usb_dev_state *ps)
458{
459 unsigned long flags;
460 struct async *as = NULL;
461
462 spin_lock_irqsave(&ps->lock, flags);
463 if (!list_empty(&ps->async_completed)) {
464 as = list_entry(ps->async_completed.next, struct async,
465 asynclist);
466 list_del_init(&as->asynclist);
467 }
468 spin_unlock_irqrestore(&ps->lock, flags);
469 return as;
470}
471
472static struct async *async_getpending(struct usb_dev_state *ps,
473 void __user *userurb)
474{
475 struct async *as;
476
477 list_for_each_entry(as, &ps->async_pending, asynclist)
478 if (as->userurb == userurb) {
479 list_del_init(&as->asynclist);
480 return as;
481 }
482
483 return NULL;
484}
485
486static void snoop_urb(struct usb_device *udev,
487 void __user *userurb, int pipe, unsigned length,
488 int timeout_or_status, enum snoop_when when,
489 unsigned char *data, unsigned data_len)
490{
491 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
492 static const char *dirs[] = {"out", "in"};
493 int ep;
494 const char *t, *d;
495
496 if (!usbfs_snoop)
497 return;
498
499 ep = usb_pipeendpoint(pipe);
500 t = types[usb_pipetype(pipe)];
501 d = dirs[!!usb_pipein(pipe)];
502
503 if (userurb) { /* Async */
504 if (when == SUBMIT)
505 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
506 "length %u\n",
507 userurb, ep, t, d, length);
508 else
509 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
510 "actual_length %u status %d\n",
511 userurb, ep, t, d, length,
512 timeout_or_status);
513 } else {
514 if (when == SUBMIT)
515 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
516 "timeout %d\n",
517 ep, t, d, length, timeout_or_status);
518 else
519 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
520 "status %d\n",
521 ep, t, d, length, timeout_or_status);
522 }
523
524 data_len = min(data_len, usbfs_snoop_max);
525 if (data && data_len > 0) {
526 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
527 data, data_len, 1);
528 }
529}
530
531static void snoop_urb_data(struct urb *urb, unsigned len)
532{
533 int i, size;
534
535 len = min(len, usbfs_snoop_max);
536 if (!usbfs_snoop || len == 0)
537 return;
538
539 if (urb->num_sgs == 0) {
540 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
541 urb->transfer_buffer, len, 1);
542 return;
543 }
544
545 for (i = 0; i < urb->num_sgs && len; i++) {
546 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
547 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
548 sg_virt(&urb->sg[i]), size, 1);
549 len -= size;
550 }
551}
552
553static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
554{
555 unsigned i, len, size;
556
557 if (urb->number_of_packets > 0) /* Isochronous */
558 len = urb->transfer_buffer_length;
559 else /* Non-Isoc */
560 len = urb->actual_length;
561
562 if (urb->num_sgs == 0) {
563 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
564 return -EFAULT;
565 return 0;
566 }
567
568 for (i = 0; i < urb->num_sgs && len; i++) {
569 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
570 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
571 return -EFAULT;
572 userbuffer += size;
573 len -= size;
574 }
575
576 return 0;
577}
578
579#define AS_CONTINUATION 1
580#define AS_UNLINK 2
581
582static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
583__releases(ps->lock)
584__acquires(ps->lock)
585{
586 struct urb *urb;
587 struct async *as;
588
589 /* Mark all the pending URBs that match bulk_addr, up to but not
590 * including the first one without AS_CONTINUATION. If such an
591 * URB is encountered then a new transfer has already started so
592 * the endpoint doesn't need to be disabled; otherwise it does.
593 */
594 list_for_each_entry(as, &ps->async_pending, asynclist) {
595 if (as->bulk_addr == bulk_addr) {
596 if (as->bulk_status != AS_CONTINUATION)
597 goto rescan;
598 as->bulk_status = AS_UNLINK;
599 as->bulk_addr = 0;
600 }
601 }
602 ps->disabled_bulk_eps |= (1 << bulk_addr);
603
604 /* Now carefully unlink all the marked pending URBs */
605 rescan:
606 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
607 if (as->bulk_status == AS_UNLINK) {
608 as->bulk_status = 0; /* Only once */
609 urb = as->urb;
610 usb_get_urb(urb);
611 spin_unlock(&ps->lock); /* Allow completions */
612 usb_unlink_urb(urb);
613 usb_put_urb(urb);
614 spin_lock(&ps->lock);
615 goto rescan;
616 }
617 }
618}
619
620static void async_completed(struct urb *urb)
621{
622 struct async *as = urb->context;
623 struct usb_dev_state *ps = as->ps;
624 struct pid *pid = NULL;
625 const struct cred *cred = NULL;
626 unsigned long flags;
627 sigval_t addr;
628 int signr, errno;
629
630 spin_lock_irqsave(&ps->lock, flags);
631 list_move_tail(&as->asynclist, &ps->async_completed);
632 as->status = urb->status;
633 signr = as->signr;
634 if (signr) {
635 errno = as->status;
636 addr = as->userurb_sigval;
637 pid = get_pid(as->pid);
638 cred = get_cred(as->cred);
639 }
640 snoop(&urb->dev->dev, "urb complete\n");
641 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
642 as->status, COMPLETE, NULL, 0);
643 if (usb_urb_dir_in(urb))
644 snoop_urb_data(urb, urb->actual_length);
645
646 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
647 as->status != -ENOENT)
648 cancel_bulk_urbs(ps, as->bulk_addr);
649
650 wake_up(&ps->wait);
651 spin_unlock_irqrestore(&ps->lock, flags);
652
653 if (signr) {
654 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
655 put_pid(pid);
656 put_cred(cred);
657 }
658}
659
660static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
661{
662 struct urb *urb;
663 struct async *as;
664 unsigned long flags;
665
666 spin_lock_irqsave(&ps->lock, flags);
667 while (!list_empty(list)) {
668 as = list_last_entry(list, struct async, asynclist);
669 list_del_init(&as->asynclist);
670 urb = as->urb;
671 usb_get_urb(urb);
672
673 /* drop the spinlock so the completion handler can run */
674 spin_unlock_irqrestore(&ps->lock, flags);
675 usb_kill_urb(urb);
676 usb_put_urb(urb);
677 spin_lock_irqsave(&ps->lock, flags);
678 }
679 spin_unlock_irqrestore(&ps->lock, flags);
680}
681
682static void destroy_async_on_interface(struct usb_dev_state *ps,
683 unsigned int ifnum)
684{
685 struct list_head *p, *q, hitlist;
686 unsigned long flags;
687
688 INIT_LIST_HEAD(&hitlist);
689 spin_lock_irqsave(&ps->lock, flags);
690 list_for_each_safe(p, q, &ps->async_pending)
691 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
692 list_move_tail(p, &hitlist);
693 spin_unlock_irqrestore(&ps->lock, flags);
694 destroy_async(ps, &hitlist);
695}
696
697static void destroy_all_async(struct usb_dev_state *ps)
698{
699 destroy_async(ps, &ps->async_pending);
700}
701
702/*
703 * interface claims are made only at the request of user level code,
704 * which can also release them (explicitly or by closing files).
705 * they're also undone when devices disconnect.
706 */
707
708static int driver_probe(struct usb_interface *intf,
709 const struct usb_device_id *id)
710{
711 return -ENODEV;
712}
713
714static void driver_disconnect(struct usb_interface *intf)
715{
716 struct usb_dev_state *ps = usb_get_intfdata(intf);
717 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
718
719 if (!ps)
720 return;
721
722 /* NOTE: this relies on usbcore having canceled and completed
723 * all pending I/O requests; 2.6 does that.
724 */
725
726 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
727 clear_bit(ifnum, &ps->ifclaimed);
728 else
729 dev_warn(&intf->dev, "interface number %u out of range\n",
730 ifnum);
731
732 usb_set_intfdata(intf, NULL);
733
734 /* force async requests to complete */
735 destroy_async_on_interface(ps, ifnum);
736}
737
738/* We don't care about suspend/resume of claimed interfaces */
739static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
740{
741 return 0;
742}
743
744static int driver_resume(struct usb_interface *intf)
745{
746 return 0;
747}
748
749#ifdef CONFIG_PM
750/* The following routines apply to the entire device, not interfaces */
751void usbfs_notify_suspend(struct usb_device *udev)
752{
753 /* We don't need to handle this */
754}
755
756void usbfs_notify_resume(struct usb_device *udev)
757{
758 struct usb_dev_state *ps;
759
760 /* Protect against simultaneous remove or release */
761 mutex_lock(&usbfs_mutex);
762 list_for_each_entry(ps, &udev->filelist, list) {
763 WRITE_ONCE(ps->not_yet_resumed, 0);
764 wake_up_all(&ps->wait_for_resume);
765 }
766 mutex_unlock(&usbfs_mutex);
767}
768#endif
769
770struct usb_driver usbfs_driver = {
771 .name = "usbfs",
772 .probe = driver_probe,
773 .disconnect = driver_disconnect,
774 .suspend = driver_suspend,
775 .resume = driver_resume,
776 .supports_autosuspend = 1,
777};
778
779static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
780{
781 struct usb_device *dev = ps->dev;
782 struct usb_interface *intf;
783 int err;
784
785 if (ifnum >= 8*sizeof(ps->ifclaimed))
786 return -EINVAL;
787 /* already claimed */
788 if (test_bit(ifnum, &ps->ifclaimed))
789 return 0;
790
791 if (ps->privileges_dropped &&
792 !test_bit(ifnum, &ps->interface_allowed_mask))
793 return -EACCES;
794
795 intf = usb_ifnum_to_if(dev, ifnum);
796 if (!intf)
797 err = -ENOENT;
798 else {
799 unsigned int old_suppress;
800
801 /* suppress uevents while claiming interface */
802 old_suppress = dev_get_uevent_suppress(&intf->dev);
803 dev_set_uevent_suppress(&intf->dev, 1);
804 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
805 dev_set_uevent_suppress(&intf->dev, old_suppress);
806 }
807 if (err == 0)
808 set_bit(ifnum, &ps->ifclaimed);
809 return err;
810}
811
812static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
813{
814 struct usb_device *dev;
815 struct usb_interface *intf;
816 int err;
817
818 err = -EINVAL;
819 if (ifnum >= 8*sizeof(ps->ifclaimed))
820 return err;
821 dev = ps->dev;
822 intf = usb_ifnum_to_if(dev, ifnum);
823 if (!intf)
824 err = -ENOENT;
825 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
826 unsigned int old_suppress;
827
828 /* suppress uevents while releasing interface */
829 old_suppress = dev_get_uevent_suppress(&intf->dev);
830 dev_set_uevent_suppress(&intf->dev, 1);
831 usb_driver_release_interface(&usbfs_driver, intf);
832 dev_set_uevent_suppress(&intf->dev, old_suppress);
833 err = 0;
834 }
835 return err;
836}
837
838static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
839{
840 if (ps->dev->state != USB_STATE_CONFIGURED)
841 return -EHOSTUNREACH;
842 if (ifnum >= 8*sizeof(ps->ifclaimed))
843 return -EINVAL;
844 if (test_bit(ifnum, &ps->ifclaimed))
845 return 0;
846 /* if not yet claimed, claim it for the driver */
847 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
848 "interface %u before use\n", task_pid_nr(current),
849 current->comm, ifnum);
850 return claimintf(ps, ifnum);
851}
852
853static int findintfep(struct usb_device *dev, unsigned int ep)
854{
855 unsigned int i, j, e;
856 struct usb_interface *intf;
857 struct usb_host_interface *alts;
858 struct usb_endpoint_descriptor *endpt;
859
860 if (ep & ~(USB_DIR_IN|0xf))
861 return -EINVAL;
862 if (!dev->actconfig)
863 return -ESRCH;
864 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
865 intf = dev->actconfig->interface[i];
866 for (j = 0; j < intf->num_altsetting; j++) {
867 alts = &intf->altsetting[j];
868 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
869 endpt = &alts->endpoint[e].desc;
870 if (endpt->bEndpointAddress == ep)
871 return alts->desc.bInterfaceNumber;
872 }
873 }
874 }
875 return -ENOENT;
876}
877
878static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
879 unsigned int request, unsigned int index)
880{
881 int ret = 0;
882 struct usb_host_interface *alt_setting;
883
884 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
885 && ps->dev->state != USB_STATE_ADDRESS
886 && ps->dev->state != USB_STATE_CONFIGURED)
887 return -EHOSTUNREACH;
888 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
889 return 0;
890
891 /*
892 * check for the special corner case 'get_device_id' in the printer
893 * class specification, which we always want to allow as it is used
894 * to query things like ink level, etc.
895 */
896 if (requesttype == 0xa1 && request == 0) {
897 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
898 index >> 8, index & 0xff);
899 if (alt_setting
900 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
901 return 0;
902 }
903
904 index &= 0xff;
905 switch (requesttype & USB_RECIP_MASK) {
906 case USB_RECIP_ENDPOINT:
907 if ((index & ~USB_DIR_IN) == 0)
908 return 0;
909 ret = findintfep(ps->dev, index);
910 if (ret < 0) {
911 /*
912 * Some not fully compliant Win apps seem to get
913 * index wrong and have the endpoint number here
914 * rather than the endpoint address (with the
915 * correct direction). Win does let this through,
916 * so we'll not reject it here but leave it to
917 * the device to not break KVM. But we warn.
918 */
919 ret = findintfep(ps->dev, index ^ 0x80);
920 if (ret >= 0)
921 dev_info(&ps->dev->dev,
922 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
923 __func__, task_pid_nr(current),
924 current->comm, index, index ^ 0x80);
925 }
926 if (ret >= 0)
927 ret = checkintf(ps, ret);
928 break;
929
930 case USB_RECIP_INTERFACE:
931 ret = checkintf(ps, index);
932 break;
933 }
934 return ret;
935}
936
937static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
938 unsigned char ep)
939{
940 if (ep & USB_ENDPOINT_DIR_MASK)
941 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
942 else
943 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
944}
945
946static int parse_usbdevfs_streams(struct usb_dev_state *ps,
947 struct usbdevfs_streams __user *streams,
948 unsigned int *num_streams_ret,
949 unsigned int *num_eps_ret,
950 struct usb_host_endpoint ***eps_ret,
951 struct usb_interface **intf_ret)
952{
953 unsigned int i, num_streams, num_eps;
954 struct usb_host_endpoint **eps;
955 struct usb_interface *intf = NULL;
956 unsigned char ep;
957 int ifnum, ret;
958
959 if (get_user(num_streams, &streams->num_streams) ||
960 get_user(num_eps, &streams->num_eps))
961 return -EFAULT;
962
963 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
964 return -EINVAL;
965
966 /* The XHCI controller allows max 2 ^ 16 streams */
967 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
968 return -EINVAL;
969
970 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
971 if (!eps)
972 return -ENOMEM;
973
974 for (i = 0; i < num_eps; i++) {
975 if (get_user(ep, &streams->eps[i])) {
976 ret = -EFAULT;
977 goto error;
978 }
979 eps[i] = ep_to_host_endpoint(ps->dev, ep);
980 if (!eps[i]) {
981 ret = -EINVAL;
982 goto error;
983 }
984
985 /* usb_alloc/free_streams operate on an usb_interface */
986 ifnum = findintfep(ps->dev, ep);
987 if (ifnum < 0) {
988 ret = ifnum;
989 goto error;
990 }
991
992 if (i == 0) {
993 ret = checkintf(ps, ifnum);
994 if (ret < 0)
995 goto error;
996 intf = usb_ifnum_to_if(ps->dev, ifnum);
997 } else {
998 /* Verify all eps belong to the same interface */
999 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1000 ret = -EINVAL;
1001 goto error;
1002 }
1003 }
1004 }
1005
1006 if (num_streams_ret)
1007 *num_streams_ret = num_streams;
1008 *num_eps_ret = num_eps;
1009 *eps_ret = eps;
1010 *intf_ret = intf;
1011
1012 return 0;
1013
1014error:
1015 kfree(eps);
1016 return ret;
1017}
1018
1019static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1020{
1021 struct device *dev;
1022
1023 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1024 if (!dev)
1025 return NULL;
1026 return to_usb_device(dev);
1027}
1028
1029/*
1030 * file operations
1031 */
1032static int usbdev_open(struct inode *inode, struct file *file)
1033{
1034 struct usb_device *dev = NULL;
1035 struct usb_dev_state *ps;
1036 int ret;
1037
1038 ret = -ENOMEM;
1039 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1040 if (!ps)
1041 goto out_free_ps;
1042
1043 ret = -ENODEV;
1044
1045 /* usbdev device-node */
1046 if (imajor(inode) == USB_DEVICE_MAJOR)
1047 dev = usbdev_lookup_by_devt(inode->i_rdev);
1048 if (!dev)
1049 goto out_free_ps;
1050
1051 usb_lock_device(dev);
1052 if (dev->state == USB_STATE_NOTATTACHED)
1053 goto out_unlock_device;
1054
1055 ret = usb_autoresume_device(dev);
1056 if (ret)
1057 goto out_unlock_device;
1058
1059 ps->dev = dev;
1060 ps->file = file;
1061 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1062 spin_lock_init(&ps->lock);
1063 INIT_LIST_HEAD(&ps->list);
1064 INIT_LIST_HEAD(&ps->async_pending);
1065 INIT_LIST_HEAD(&ps->async_completed);
1066 INIT_LIST_HEAD(&ps->memory_list);
1067 init_waitqueue_head(&ps->wait);
1068 init_waitqueue_head(&ps->wait_for_resume);
1069 ps->disc_pid = get_pid(task_pid(current));
1070 ps->cred = get_current_cred();
1071 smp_wmb();
1072
1073 /* Can't race with resume; the device is already active */
1074 list_add_tail(&ps->list, &dev->filelist);
1075 file->private_data = ps;
1076 usb_unlock_device(dev);
1077 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1078 current->comm);
1079 return ret;
1080
1081 out_unlock_device:
1082 usb_unlock_device(dev);
1083 usb_put_dev(dev);
1084 out_free_ps:
1085 kfree(ps);
1086 return ret;
1087}
1088
1089static int usbdev_release(struct inode *inode, struct file *file)
1090{
1091 struct usb_dev_state *ps = file->private_data;
1092 struct usb_device *dev = ps->dev;
1093 unsigned int ifnum;
1094 struct async *as;
1095
1096 usb_lock_device(dev);
1097 usb_hub_release_all_ports(dev, ps);
1098
1099 /* Protect against simultaneous resume */
1100 mutex_lock(&usbfs_mutex);
1101 list_del_init(&ps->list);
1102 mutex_unlock(&usbfs_mutex);
1103
1104 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1105 ifnum++) {
1106 if (test_bit(ifnum, &ps->ifclaimed))
1107 releaseintf(ps, ifnum);
1108 }
1109 destroy_all_async(ps);
1110 if (!ps->suspend_allowed)
1111 usb_autosuspend_device(dev);
1112 usb_unlock_device(dev);
1113 usb_put_dev(dev);
1114 put_pid(ps->disc_pid);
1115 put_cred(ps->cred);
1116
1117 as = async_getcompleted(ps);
1118 while (as) {
1119 free_async(as);
1120 as = async_getcompleted(ps);
1121 }
1122
1123 kfree(ps);
1124 return 0;
1125}
1126
1127static void usbfs_blocking_completion(struct urb *urb)
1128{
1129 complete((struct completion *) urb->context);
1130}
1131
1132/*
1133 * Much like usb_start_wait_urb, but returns status separately from
1134 * actual_length and uses a killable wait.
1135 */
1136static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1137 unsigned int *actlen)
1138{
1139 DECLARE_COMPLETION_ONSTACK(ctx);
1140 unsigned long expire;
1141 int rc;
1142
1143 urb->context = &ctx;
1144 urb->complete = usbfs_blocking_completion;
1145 *actlen = 0;
1146 rc = usb_submit_urb(urb, GFP_KERNEL);
1147 if (unlikely(rc))
1148 return rc;
1149
1150 expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1151 rc = wait_for_completion_killable_timeout(&ctx, expire);
1152 if (rc <= 0) {
1153 usb_kill_urb(urb);
1154 *actlen = urb->actual_length;
1155 if (urb->status != -ENOENT)
1156 ; /* Completed before it was killed */
1157 else if (rc < 0)
1158 return -EINTR;
1159 else
1160 return -ETIMEDOUT;
1161 }
1162 *actlen = urb->actual_length;
1163 return urb->status;
1164}
1165
1166static int do_proc_control(struct usb_dev_state *ps,
1167 struct usbdevfs_ctrltransfer *ctrl)
1168{
1169 struct usb_device *dev = ps->dev;
1170 unsigned int tmo;
1171 unsigned char *tbuf;
1172 unsigned int wLength, actlen;
1173 int i, pipe, ret;
1174 struct urb *urb = NULL;
1175 struct usb_ctrlrequest *dr = NULL;
1176
1177 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1178 ctrl->wIndex);
1179 if (ret)
1180 return ret;
1181 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1182 if (wLength > PAGE_SIZE)
1183 return -EINVAL;
1184 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1185 sizeof(struct usb_ctrlrequest));
1186 if (ret)
1187 return ret;
1188
1189 ret = -ENOMEM;
1190 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1191 if (!tbuf)
1192 goto done;
1193 urb = usb_alloc_urb(0, GFP_NOIO);
1194 if (!urb)
1195 goto done;
1196 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1197 if (!dr)
1198 goto done;
1199
1200 dr->bRequestType = ctrl->bRequestType;
1201 dr->bRequest = ctrl->bRequest;
1202 dr->wValue = cpu_to_le16(ctrl->wValue);
1203 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1204 dr->wLength = cpu_to_le16(ctrl->wLength);
1205
1206 tmo = ctrl->timeout;
1207 snoop(&dev->dev, "control urb: bRequestType=%02x "
1208 "bRequest=%02x wValue=%04x "
1209 "wIndex=%04x wLength=%04x\n",
1210 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1211 ctrl->wIndex, ctrl->wLength);
1212
1213 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1214 pipe = usb_rcvctrlpipe(dev, 0);
1215 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1216 wLength, NULL, NULL);
1217 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1218
1219 usb_unlock_device(dev);
1220 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1221
1222 /* Linger a bit, prior to the next control message. */
1223 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1224 msleep(200);
1225 usb_lock_device(dev);
1226 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1227 if (!i && actlen) {
1228 if (copy_to_user(ctrl->data, tbuf, actlen)) {
1229 ret = -EFAULT;
1230 goto done;
1231 }
1232 }
1233 } else {
1234 if (wLength) {
1235 if (copy_from_user(tbuf, ctrl->data, wLength)) {
1236 ret = -EFAULT;
1237 goto done;
1238 }
1239 }
1240 pipe = usb_sndctrlpipe(dev, 0);
1241 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1242 wLength, NULL, NULL);
1243 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1244
1245 usb_unlock_device(dev);
1246 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1247
1248 /* Linger a bit, prior to the next control message. */
1249 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1250 msleep(200);
1251 usb_lock_device(dev);
1252 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1253 }
1254 if (i < 0 && i != -EPIPE) {
1255 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1256 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1257 current->comm, ctrl->bRequestType, ctrl->bRequest,
1258 ctrl->wLength, i);
1259 }
1260 ret = (i < 0 ? i : actlen);
1261
1262 done:
1263 kfree(dr);
1264 usb_free_urb(urb);
1265 free_page((unsigned long) tbuf);
1266 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1267 sizeof(struct usb_ctrlrequest));
1268 return ret;
1269}
1270
1271static int proc_control(struct usb_dev_state *ps, void __user *arg)
1272{
1273 struct usbdevfs_ctrltransfer ctrl;
1274
1275 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1276 return -EFAULT;
1277 return do_proc_control(ps, &ctrl);
1278}
1279
1280static int do_proc_bulk(struct usb_dev_state *ps,
1281 struct usbdevfs_bulktransfer *bulk)
1282{
1283 struct usb_device *dev = ps->dev;
1284 unsigned int tmo, len1, len2, pipe;
1285 unsigned char *tbuf;
1286 int i, ret;
1287 struct urb *urb = NULL;
1288 struct usb_host_endpoint *ep;
1289
1290 ret = findintfep(ps->dev, bulk->ep);
1291 if (ret < 0)
1292 return ret;
1293 ret = checkintf(ps, ret);
1294 if (ret)
1295 return ret;
1296
1297 len1 = bulk->len;
1298 if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1299 return -EINVAL;
1300
1301 if (bulk->ep & USB_DIR_IN)
1302 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1303 else
1304 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1305 ep = usb_pipe_endpoint(dev, pipe);
1306 if (!ep || !usb_endpoint_maxp(&ep->desc))
1307 return -EINVAL;
1308 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1309 if (ret)
1310 return ret;
1311
1312 /*
1313 * len1 can be almost arbitrarily large. Don't WARN if it's
1314 * too big, just fail the request.
1315 */
1316 ret = -ENOMEM;
1317 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1318 if (!tbuf)
1319 goto done;
1320 urb = usb_alloc_urb(0, GFP_KERNEL);
1321 if (!urb)
1322 goto done;
1323
1324 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1325 USB_ENDPOINT_XFER_INT) {
1326 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1327 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1328 NULL, NULL, ep->desc.bInterval);
1329 } else {
1330 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1331 }
1332
1333 tmo = bulk->timeout;
1334 if (bulk->ep & 0x80) {
1335 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1336
1337 usb_unlock_device(dev);
1338 i = usbfs_start_wait_urb(urb, tmo, &len2);
1339 usb_lock_device(dev);
1340 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1341
1342 if (!i && len2) {
1343 if (copy_to_user(bulk->data, tbuf, len2)) {
1344 ret = -EFAULT;
1345 goto done;
1346 }
1347 }
1348 } else {
1349 if (len1) {
1350 if (copy_from_user(tbuf, bulk->data, len1)) {
1351 ret = -EFAULT;
1352 goto done;
1353 }
1354 }
1355 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1356
1357 usb_unlock_device(dev);
1358 i = usbfs_start_wait_urb(urb, tmo, &len2);
1359 usb_lock_device(dev);
1360 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1361 }
1362 ret = (i < 0 ? i : len2);
1363 done:
1364 usb_free_urb(urb);
1365 kfree(tbuf);
1366 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1367 return ret;
1368}
1369
1370static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1371{
1372 struct usbdevfs_bulktransfer bulk;
1373
1374 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1375 return -EFAULT;
1376 return do_proc_bulk(ps, &bulk);
1377}
1378
1379static void check_reset_of_active_ep(struct usb_device *udev,
1380 unsigned int epnum, char *ioctl_name)
1381{
1382 struct usb_host_endpoint **eps;
1383 struct usb_host_endpoint *ep;
1384
1385 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1386 ep = eps[epnum & 0x0f];
1387 if (ep && !list_empty(&ep->urb_list))
1388 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1389 task_pid_nr(current), current->comm,
1390 ioctl_name, epnum);
1391}
1392
1393static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1394{
1395 unsigned int ep;
1396 int ret;
1397
1398 if (get_user(ep, (unsigned int __user *)arg))
1399 return -EFAULT;
1400 ret = findintfep(ps->dev, ep);
1401 if (ret < 0)
1402 return ret;
1403 ret = checkintf(ps, ret);
1404 if (ret)
1405 return ret;
1406 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1407 usb_reset_endpoint(ps->dev, ep);
1408 return 0;
1409}
1410
1411static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1412{
1413 unsigned int ep;
1414 int pipe;
1415 int ret;
1416
1417 if (get_user(ep, (unsigned int __user *)arg))
1418 return -EFAULT;
1419 ret = findintfep(ps->dev, ep);
1420 if (ret < 0)
1421 return ret;
1422 ret = checkintf(ps, ret);
1423 if (ret)
1424 return ret;
1425 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1426 if (ep & USB_DIR_IN)
1427 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1428 else
1429 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1430
1431 return usb_clear_halt(ps->dev, pipe);
1432}
1433
1434static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1435{
1436 struct usbdevfs_getdriver gd;
1437 struct usb_interface *intf;
1438 int ret;
1439
1440 if (copy_from_user(&gd, arg, sizeof(gd)))
1441 return -EFAULT;
1442 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1443 if (!intf || !intf->dev.driver)
1444 ret = -ENODATA;
1445 else {
1446 strscpy(gd.driver, intf->dev.driver->name,
1447 sizeof(gd.driver));
1448 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1449 }
1450 return ret;
1451}
1452
1453static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1454{
1455 struct usbdevfs_connectinfo ci;
1456
1457 memset(&ci, 0, sizeof(ci));
1458 ci.devnum = ps->dev->devnum;
1459 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1460
1461 if (copy_to_user(arg, &ci, sizeof(ci)))
1462 return -EFAULT;
1463 return 0;
1464}
1465
1466static int proc_conninfo_ex(struct usb_dev_state *ps,
1467 void __user *arg, size_t size)
1468{
1469 struct usbdevfs_conninfo_ex ci;
1470 struct usb_device *udev = ps->dev;
1471
1472 if (size < sizeof(ci.size))
1473 return -EINVAL;
1474
1475 memset(&ci, 0, sizeof(ci));
1476 ci.size = sizeof(ci);
1477 ci.busnum = udev->bus->busnum;
1478 ci.devnum = udev->devnum;
1479 ci.speed = udev->speed;
1480
1481 while (udev && udev->portnum != 0) {
1482 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1483 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1484 udev->portnum;
1485 udev = udev->parent;
1486 }
1487
1488 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1489 memmove(&ci.ports[0],
1490 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1491 ci.num_ports);
1492
1493 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1494 return -EFAULT;
1495
1496 return 0;
1497}
1498
1499static int proc_resetdevice(struct usb_dev_state *ps)
1500{
1501 struct usb_host_config *actconfig = ps->dev->actconfig;
1502 struct usb_interface *interface;
1503 int i, number;
1504
1505 /* Don't allow a device reset if the process has dropped the
1506 * privilege to do such things and any of the interfaces are
1507 * currently claimed.
1508 */
1509 if (ps->privileges_dropped && actconfig) {
1510 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1511 interface = actconfig->interface[i];
1512 number = interface->cur_altsetting->desc.bInterfaceNumber;
1513 if (usb_interface_claimed(interface) &&
1514 !test_bit(number, &ps->ifclaimed)) {
1515 dev_warn(&ps->dev->dev,
1516 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1517 number, interface->dev.driver->name, current->comm);
1518 return -EACCES;
1519 }
1520 }
1521 }
1522
1523 return usb_reset_device(ps->dev);
1524}
1525
1526static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1527{
1528 struct usbdevfs_setinterface setintf;
1529 int ret;
1530
1531 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1532 return -EFAULT;
1533 ret = checkintf(ps, setintf.interface);
1534 if (ret)
1535 return ret;
1536
1537 destroy_async_on_interface(ps, setintf.interface);
1538
1539 return usb_set_interface(ps->dev, setintf.interface,
1540 setintf.altsetting);
1541}
1542
1543static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1544{
1545 int u;
1546 int status = 0;
1547 struct usb_host_config *actconfig;
1548
1549 if (get_user(u, (int __user *)arg))
1550 return -EFAULT;
1551
1552 actconfig = ps->dev->actconfig;
1553
1554 /* Don't touch the device if any interfaces are claimed.
1555 * It could interfere with other drivers' operations, and if
1556 * an interface is claimed by usbfs it could easily deadlock.
1557 */
1558 if (actconfig) {
1559 int i;
1560
1561 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1562 if (usb_interface_claimed(actconfig->interface[i])) {
1563 dev_warn(&ps->dev->dev,
1564 "usbfs: interface %d claimed by %s "
1565 "while '%s' sets config #%d\n",
1566 actconfig->interface[i]
1567 ->cur_altsetting
1568 ->desc.bInterfaceNumber,
1569 actconfig->interface[i]
1570 ->dev.driver->name,
1571 current->comm, u);
1572 status = -EBUSY;
1573 break;
1574 }
1575 }
1576 }
1577
1578 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1579 * so avoid usb_set_configuration()'s kick to sysfs
1580 */
1581 if (status == 0) {
1582 if (actconfig && actconfig->desc.bConfigurationValue == u)
1583 status = usb_reset_configuration(ps->dev);
1584 else
1585 status = usb_set_configuration(ps->dev, u);
1586 }
1587
1588 return status;
1589}
1590
1591static struct usb_memory *
1592find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1593{
1594 struct usb_memory *usbm = NULL, *iter;
1595 unsigned long flags;
1596 unsigned long uurb_start = (unsigned long)uurb->buffer;
1597
1598 spin_lock_irqsave(&ps->lock, flags);
1599 list_for_each_entry(iter, &ps->memory_list, memlist) {
1600 if (uurb_start >= iter->vm_start &&
1601 uurb_start < iter->vm_start + iter->size) {
1602 if (uurb->buffer_length > iter->vm_start + iter->size -
1603 uurb_start) {
1604 usbm = ERR_PTR(-EINVAL);
1605 } else {
1606 usbm = iter;
1607 usbm->urb_use_count++;
1608 }
1609 break;
1610 }
1611 }
1612 spin_unlock_irqrestore(&ps->lock, flags);
1613 return usbm;
1614}
1615
1616static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1617 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1618 void __user *arg, sigval_t userurb_sigval)
1619{
1620 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1621 struct usb_host_endpoint *ep;
1622 struct async *as = NULL;
1623 struct usb_ctrlrequest *dr = NULL;
1624 unsigned int u, totlen, isofrmlen;
1625 int i, ret, num_sgs = 0, ifnum = -1;
1626 int number_of_packets = 0;
1627 unsigned int stream_id = 0;
1628 void *buf;
1629 bool is_in;
1630 bool allow_short = false;
1631 bool allow_zero = false;
1632 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1633 USBDEVFS_URB_BULK_CONTINUATION |
1634 USBDEVFS_URB_NO_FSBR |
1635 USBDEVFS_URB_ZERO_PACKET |
1636 USBDEVFS_URB_NO_INTERRUPT;
1637 /* USBDEVFS_URB_ISO_ASAP is a special case */
1638 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1639 mask |= USBDEVFS_URB_ISO_ASAP;
1640
1641 if (uurb->flags & ~mask)
1642 return -EINVAL;
1643
1644 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1645 return -EINVAL;
1646 if (uurb->buffer_length > 0 && !uurb->buffer)
1647 return -EINVAL;
1648 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1649 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1650 ifnum = findintfep(ps->dev, uurb->endpoint);
1651 if (ifnum < 0)
1652 return ifnum;
1653 ret = checkintf(ps, ifnum);
1654 if (ret)
1655 return ret;
1656 }
1657 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1658 if (!ep)
1659 return -ENOENT;
1660 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1661
1662 u = 0;
1663 switch (uurb->type) {
1664 case USBDEVFS_URB_TYPE_CONTROL:
1665 if (!usb_endpoint_xfer_control(&ep->desc))
1666 return -EINVAL;
1667 /* min 8 byte setup packet */
1668 if (uurb->buffer_length < 8)
1669 return -EINVAL;
1670 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1671 if (!dr)
1672 return -ENOMEM;
1673 if (copy_from_user(dr, uurb->buffer, 8)) {
1674 ret = -EFAULT;
1675 goto error;
1676 }
1677 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1678 ret = -EINVAL;
1679 goto error;
1680 }
1681 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1682 le16_to_cpu(dr->wIndex));
1683 if (ret)
1684 goto error;
1685 uurb->buffer_length = le16_to_cpu(dr->wLength);
1686 uurb->buffer += 8;
1687 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1688 is_in = true;
1689 uurb->endpoint |= USB_DIR_IN;
1690 } else {
1691 is_in = false;
1692 uurb->endpoint &= ~USB_DIR_IN;
1693 }
1694 if (is_in)
1695 allow_short = true;
1696 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1697 "bRequest=%02x wValue=%04x "
1698 "wIndex=%04x wLength=%04x\n",
1699 dr->bRequestType, dr->bRequest,
1700 __le16_to_cpu(dr->wValue),
1701 __le16_to_cpu(dr->wIndex),
1702 __le16_to_cpu(dr->wLength));
1703 u = sizeof(struct usb_ctrlrequest);
1704 break;
1705
1706 case USBDEVFS_URB_TYPE_BULK:
1707 if (!is_in)
1708 allow_zero = true;
1709 else
1710 allow_short = true;
1711 switch (usb_endpoint_type(&ep->desc)) {
1712 case USB_ENDPOINT_XFER_CONTROL:
1713 case USB_ENDPOINT_XFER_ISOC:
1714 return -EINVAL;
1715 case USB_ENDPOINT_XFER_INT:
1716 /* allow single-shot interrupt transfers */
1717 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1718 goto interrupt_urb;
1719 }
1720 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1721 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1722 num_sgs = 0;
1723 if (ep->streams)
1724 stream_id = uurb->stream_id;
1725 break;
1726
1727 case USBDEVFS_URB_TYPE_INTERRUPT:
1728 if (!usb_endpoint_xfer_int(&ep->desc))
1729 return -EINVAL;
1730 interrupt_urb:
1731 if (!is_in)
1732 allow_zero = true;
1733 else
1734 allow_short = true;
1735 break;
1736
1737 case USBDEVFS_URB_TYPE_ISO:
1738 /* arbitrary limit */
1739 if (uurb->number_of_packets < 1 ||
1740 uurb->number_of_packets > 128)
1741 return -EINVAL;
1742 if (!usb_endpoint_xfer_isoc(&ep->desc))
1743 return -EINVAL;
1744 number_of_packets = uurb->number_of_packets;
1745 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1746 number_of_packets;
1747 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1748 if (IS_ERR(isopkt)) {
1749 ret = PTR_ERR(isopkt);
1750 isopkt = NULL;
1751 goto error;
1752 }
1753 for (totlen = u = 0; u < number_of_packets; u++) {
1754 /*
1755 * arbitrary limit need for USB 3.1 Gen2
1756 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1757 */
1758 if (isopkt[u].length > 98304) {
1759 ret = -EINVAL;
1760 goto error;
1761 }
1762 totlen += isopkt[u].length;
1763 }
1764 u *= sizeof(struct usb_iso_packet_descriptor);
1765 uurb->buffer_length = totlen;
1766 break;
1767
1768 default:
1769 return -EINVAL;
1770 }
1771
1772 if (uurb->buffer_length > 0 &&
1773 !access_ok(uurb->buffer, uurb->buffer_length)) {
1774 ret = -EFAULT;
1775 goto error;
1776 }
1777 as = alloc_async(number_of_packets);
1778 if (!as) {
1779 ret = -ENOMEM;
1780 goto error;
1781 }
1782
1783 as->usbm = find_memory_area(ps, uurb);
1784 if (IS_ERR(as->usbm)) {
1785 ret = PTR_ERR(as->usbm);
1786 as->usbm = NULL;
1787 goto error;
1788 }
1789
1790 /* do not use SG buffers when memory mapped segments
1791 * are in use
1792 */
1793 if (as->usbm)
1794 num_sgs = 0;
1795
1796 u += sizeof(struct async) + sizeof(struct urb) +
1797 (as->usbm ? 0 : uurb->buffer_length) +
1798 num_sgs * sizeof(struct scatterlist);
1799 ret = usbfs_increase_memory_usage(u);
1800 if (ret)
1801 goto error;
1802 as->mem_usage = u;
1803
1804 if (num_sgs) {
1805 as->urb->sg = kmalloc_array(num_sgs,
1806 sizeof(struct scatterlist),
1807 GFP_KERNEL | __GFP_NOWARN);
1808 if (!as->urb->sg) {
1809 ret = -ENOMEM;
1810 goto error;
1811 }
1812 as->urb->num_sgs = num_sgs;
1813 sg_init_table(as->urb->sg, as->urb->num_sgs);
1814
1815 totlen = uurb->buffer_length;
1816 for (i = 0; i < as->urb->num_sgs; i++) {
1817 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1818 buf = kmalloc(u, GFP_KERNEL);
1819 if (!buf) {
1820 ret = -ENOMEM;
1821 goto error;
1822 }
1823 sg_set_buf(&as->urb->sg[i], buf, u);
1824
1825 if (!is_in) {
1826 if (copy_from_user(buf, uurb->buffer, u)) {
1827 ret = -EFAULT;
1828 goto error;
1829 }
1830 uurb->buffer += u;
1831 }
1832 totlen -= u;
1833 }
1834 } else if (uurb->buffer_length > 0) {
1835 if (as->usbm) {
1836 unsigned long uurb_start = (unsigned long)uurb->buffer;
1837
1838 as->urb->transfer_buffer = as->usbm->mem +
1839 (uurb_start - as->usbm->vm_start);
1840 } else {
1841 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1842 GFP_KERNEL | __GFP_NOWARN);
1843 if (!as->urb->transfer_buffer) {
1844 ret = -ENOMEM;
1845 goto error;
1846 }
1847 if (!is_in) {
1848 if (copy_from_user(as->urb->transfer_buffer,
1849 uurb->buffer,
1850 uurb->buffer_length)) {
1851 ret = -EFAULT;
1852 goto error;
1853 }
1854 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1855 /*
1856 * Isochronous input data may end up being
1857 * discontiguous if some of the packets are
1858 * short. Clear the buffer so that the gaps
1859 * don't leak kernel data to userspace.
1860 */
1861 memset(as->urb->transfer_buffer, 0,
1862 uurb->buffer_length);
1863 }
1864 }
1865 }
1866 as->urb->dev = ps->dev;
1867 as->urb->pipe = (uurb->type << 30) |
1868 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1869 (uurb->endpoint & USB_DIR_IN);
1870
1871 /* This tedious sequence is necessary because the URB_* flags
1872 * are internal to the kernel and subject to change, whereas
1873 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1874 */
1875 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1876 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1877 u |= URB_ISO_ASAP;
1878 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1879 u |= URB_SHORT_NOT_OK;
1880 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1881 u |= URB_ZERO_PACKET;
1882 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1883 u |= URB_NO_INTERRUPT;
1884 as->urb->transfer_flags = u;
1885
1886 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1887 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1888 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1889 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1890
1891 as->urb->transfer_buffer_length = uurb->buffer_length;
1892 as->urb->setup_packet = (unsigned char *)dr;
1893 dr = NULL;
1894 as->urb->start_frame = uurb->start_frame;
1895 as->urb->number_of_packets = number_of_packets;
1896 as->urb->stream_id = stream_id;
1897
1898 if (ep->desc.bInterval) {
1899 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1900 ps->dev->speed == USB_SPEED_HIGH ||
1901 ps->dev->speed >= USB_SPEED_SUPER)
1902 as->urb->interval = 1 <<
1903 min(15, ep->desc.bInterval - 1);
1904 else
1905 as->urb->interval = ep->desc.bInterval;
1906 }
1907
1908 as->urb->context = as;
1909 as->urb->complete = async_completed;
1910 for (totlen = u = 0; u < number_of_packets; u++) {
1911 as->urb->iso_frame_desc[u].offset = totlen;
1912 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1913 totlen += isopkt[u].length;
1914 }
1915 kfree(isopkt);
1916 isopkt = NULL;
1917 as->ps = ps;
1918 as->userurb = arg;
1919 as->userurb_sigval = userurb_sigval;
1920 if (as->usbm) {
1921 unsigned long uurb_start = (unsigned long)uurb->buffer;
1922
1923 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1924 as->urb->transfer_dma = as->usbm->dma_handle +
1925 (uurb_start - as->usbm->vm_start);
1926 } else if (is_in && uurb->buffer_length > 0)
1927 as->userbuffer = uurb->buffer;
1928 as->signr = uurb->signr;
1929 as->ifnum = ifnum;
1930 as->pid = get_pid(task_pid(current));
1931 as->cred = get_current_cred();
1932 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1933 as->urb->transfer_buffer_length, 0, SUBMIT,
1934 NULL, 0);
1935 if (!is_in)
1936 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1937
1938 async_newpending(as);
1939
1940 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1941 spin_lock_irq(&ps->lock);
1942
1943 /* Not exactly the endpoint address; the direction bit is
1944 * shifted to the 0x10 position so that the value will be
1945 * between 0 and 31.
1946 */
1947 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1948 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1949 >> 3);
1950
1951 /* If this bulk URB is the start of a new transfer, re-enable
1952 * the endpoint. Otherwise mark it as a continuation URB.
1953 */
1954 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1955 as->bulk_status = AS_CONTINUATION;
1956 else
1957 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1958
1959 /* Don't accept continuation URBs if the endpoint is
1960 * disabled because of an earlier error.
1961 */
1962 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1963 ret = -EREMOTEIO;
1964 else
1965 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1966 spin_unlock_irq(&ps->lock);
1967 } else {
1968 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1969 }
1970
1971 if (ret) {
1972 dev_printk(KERN_DEBUG, &ps->dev->dev,
1973 "usbfs: usb_submit_urb returned %d\n", ret);
1974 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1975 0, ret, COMPLETE, NULL, 0);
1976 async_removepending(as);
1977 goto error;
1978 }
1979 return 0;
1980
1981 error:
1982 kfree(isopkt);
1983 kfree(dr);
1984 if (as)
1985 free_async(as);
1986 return ret;
1987}
1988
1989static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1990{
1991 struct usbdevfs_urb uurb;
1992 sigval_t userurb_sigval;
1993
1994 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1995 return -EFAULT;
1996
1997 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1998 userurb_sigval.sival_ptr = arg;
1999
2000 return proc_do_submiturb(ps, &uurb,
2001 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2002 arg, userurb_sigval);
2003}
2004
2005static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2006{
2007 struct urb *urb;
2008 struct async *as;
2009 unsigned long flags;
2010
2011 spin_lock_irqsave(&ps->lock, flags);
2012 as = async_getpending(ps, arg);
2013 if (!as) {
2014 spin_unlock_irqrestore(&ps->lock, flags);
2015 return -EINVAL;
2016 }
2017
2018 urb = as->urb;
2019 usb_get_urb(urb);
2020 spin_unlock_irqrestore(&ps->lock, flags);
2021
2022 usb_kill_urb(urb);
2023 usb_put_urb(urb);
2024
2025 return 0;
2026}
2027
2028static void compute_isochronous_actual_length(struct urb *urb)
2029{
2030 unsigned int i;
2031
2032 if (urb->number_of_packets > 0) {
2033 urb->actual_length = 0;
2034 for (i = 0; i < urb->number_of_packets; i++)
2035 urb->actual_length +=
2036 urb->iso_frame_desc[i].actual_length;
2037 }
2038}
2039
2040static int processcompl(struct async *as, void __user * __user *arg)
2041{
2042 struct urb *urb = as->urb;
2043 struct usbdevfs_urb __user *userurb = as->userurb;
2044 void __user *addr = as->userurb;
2045 unsigned int i;
2046
2047 compute_isochronous_actual_length(urb);
2048 if (as->userbuffer && urb->actual_length) {
2049 if (copy_urb_data_to_user(as->userbuffer, urb))
2050 goto err_out;
2051 }
2052 if (put_user(as->status, &userurb->status))
2053 goto err_out;
2054 if (put_user(urb->actual_length, &userurb->actual_length))
2055 goto err_out;
2056 if (put_user(urb->error_count, &userurb->error_count))
2057 goto err_out;
2058
2059 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2060 for (i = 0; i < urb->number_of_packets; i++) {
2061 if (put_user(urb->iso_frame_desc[i].actual_length,
2062 &userurb->iso_frame_desc[i].actual_length))
2063 goto err_out;
2064 if (put_user(urb->iso_frame_desc[i].status,
2065 &userurb->iso_frame_desc[i].status))
2066 goto err_out;
2067 }
2068 }
2069
2070 if (put_user(addr, (void __user * __user *)arg))
2071 return -EFAULT;
2072 return 0;
2073
2074err_out:
2075 return -EFAULT;
2076}
2077
2078static struct async *reap_as(struct usb_dev_state *ps)
2079{
2080 DECLARE_WAITQUEUE(wait, current);
2081 struct async *as = NULL;
2082 struct usb_device *dev = ps->dev;
2083
2084 add_wait_queue(&ps->wait, &wait);
2085 for (;;) {
2086 __set_current_state(TASK_INTERRUPTIBLE);
2087 as = async_getcompleted(ps);
2088 if (as || !connected(ps))
2089 break;
2090 if (signal_pending(current))
2091 break;
2092 usb_unlock_device(dev);
2093 schedule();
2094 usb_lock_device(dev);
2095 }
2096 remove_wait_queue(&ps->wait, &wait);
2097 set_current_state(TASK_RUNNING);
2098 return as;
2099}
2100
2101static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2102{
2103 struct async *as = reap_as(ps);
2104
2105 if (as) {
2106 int retval;
2107
2108 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2109 retval = processcompl(as, (void __user * __user *)arg);
2110 free_async(as);
2111 return retval;
2112 }
2113 if (signal_pending(current))
2114 return -EINTR;
2115 return -ENODEV;
2116}
2117
2118static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2119{
2120 int retval;
2121 struct async *as;
2122
2123 as = async_getcompleted(ps);
2124 if (as) {
2125 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2126 retval = processcompl(as, (void __user * __user *)arg);
2127 free_async(as);
2128 } else {
2129 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2130 }
2131 return retval;
2132}
2133
2134#ifdef CONFIG_COMPAT
2135static int proc_control_compat(struct usb_dev_state *ps,
2136 struct usbdevfs_ctrltransfer32 __user *p32)
2137{
2138 struct usbdevfs_ctrltransfer ctrl;
2139 u32 udata;
2140
2141 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2142 get_user(udata, &p32->data))
2143 return -EFAULT;
2144 ctrl.data = compat_ptr(udata);
2145 return do_proc_control(ps, &ctrl);
2146}
2147
2148static int proc_bulk_compat(struct usb_dev_state *ps,
2149 struct usbdevfs_bulktransfer32 __user *p32)
2150{
2151 struct usbdevfs_bulktransfer bulk;
2152 compat_caddr_t addr;
2153
2154 if (get_user(bulk.ep, &p32->ep) ||
2155 get_user(bulk.len, &p32->len) ||
2156 get_user(bulk.timeout, &p32->timeout) ||
2157 get_user(addr, &p32->data))
2158 return -EFAULT;
2159 bulk.data = compat_ptr(addr);
2160 return do_proc_bulk(ps, &bulk);
2161}
2162
2163static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2164{
2165 struct usbdevfs_disconnectsignal32 ds;
2166
2167 if (copy_from_user(&ds, arg, sizeof(ds)))
2168 return -EFAULT;
2169 ps->discsignr = ds.signr;
2170 ps->disccontext.sival_int = ds.context;
2171 return 0;
2172}
2173
2174static int get_urb32(struct usbdevfs_urb *kurb,
2175 struct usbdevfs_urb32 __user *uurb)
2176{
2177 struct usbdevfs_urb32 urb32;
2178 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2179 return -EFAULT;
2180 kurb->type = urb32.type;
2181 kurb->endpoint = urb32.endpoint;
2182 kurb->status = urb32.status;
2183 kurb->flags = urb32.flags;
2184 kurb->buffer = compat_ptr(urb32.buffer);
2185 kurb->buffer_length = urb32.buffer_length;
2186 kurb->actual_length = urb32.actual_length;
2187 kurb->start_frame = urb32.start_frame;
2188 kurb->number_of_packets = urb32.number_of_packets;
2189 kurb->error_count = urb32.error_count;
2190 kurb->signr = urb32.signr;
2191 kurb->usercontext = compat_ptr(urb32.usercontext);
2192 return 0;
2193}
2194
2195static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2196{
2197 struct usbdevfs_urb uurb;
2198 sigval_t userurb_sigval;
2199
2200 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2201 return -EFAULT;
2202
2203 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2204 userurb_sigval.sival_int = ptr_to_compat(arg);
2205
2206 return proc_do_submiturb(ps, &uurb,
2207 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2208 arg, userurb_sigval);
2209}
2210
2211static int processcompl_compat(struct async *as, void __user * __user *arg)
2212{
2213 struct urb *urb = as->urb;
2214 struct usbdevfs_urb32 __user *userurb = as->userurb;
2215 void __user *addr = as->userurb;
2216 unsigned int i;
2217
2218 compute_isochronous_actual_length(urb);
2219 if (as->userbuffer && urb->actual_length) {
2220 if (copy_urb_data_to_user(as->userbuffer, urb))
2221 return -EFAULT;
2222 }
2223 if (put_user(as->status, &userurb->status))
2224 return -EFAULT;
2225 if (put_user(urb->actual_length, &userurb->actual_length))
2226 return -EFAULT;
2227 if (put_user(urb->error_count, &userurb->error_count))
2228 return -EFAULT;
2229
2230 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2231 for (i = 0; i < urb->number_of_packets; i++) {
2232 if (put_user(urb->iso_frame_desc[i].actual_length,
2233 &userurb->iso_frame_desc[i].actual_length))
2234 return -EFAULT;
2235 if (put_user(urb->iso_frame_desc[i].status,
2236 &userurb->iso_frame_desc[i].status))
2237 return -EFAULT;
2238 }
2239 }
2240
2241 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2242 return -EFAULT;
2243 return 0;
2244}
2245
2246static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2247{
2248 struct async *as = reap_as(ps);
2249
2250 if (as) {
2251 int retval;
2252
2253 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2254 retval = processcompl_compat(as, (void __user * __user *)arg);
2255 free_async(as);
2256 return retval;
2257 }
2258 if (signal_pending(current))
2259 return -EINTR;
2260 return -ENODEV;
2261}
2262
2263static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2264{
2265 int retval;
2266 struct async *as;
2267
2268 as = async_getcompleted(ps);
2269 if (as) {
2270 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2271 retval = processcompl_compat(as, (void __user * __user *)arg);
2272 free_async(as);
2273 } else {
2274 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2275 }
2276 return retval;
2277}
2278
2279
2280#endif
2281
2282static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2283{
2284 struct usbdevfs_disconnectsignal ds;
2285
2286 if (copy_from_user(&ds, arg, sizeof(ds)))
2287 return -EFAULT;
2288 ps->discsignr = ds.signr;
2289 ps->disccontext.sival_ptr = ds.context;
2290 return 0;
2291}
2292
2293static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2294{
2295 unsigned int ifnum;
2296
2297 if (get_user(ifnum, (unsigned int __user *)arg))
2298 return -EFAULT;
2299 return claimintf(ps, ifnum);
2300}
2301
2302static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2303{
2304 unsigned int ifnum;
2305 int ret;
2306
2307 if (get_user(ifnum, (unsigned int __user *)arg))
2308 return -EFAULT;
2309 ret = releaseintf(ps, ifnum);
2310 if (ret < 0)
2311 return ret;
2312 destroy_async_on_interface(ps, ifnum);
2313 return 0;
2314}
2315
2316static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2317{
2318 int size;
2319 void *buf = NULL;
2320 int retval = 0;
2321 struct usb_interface *intf = NULL;
2322 struct usb_driver *driver = NULL;
2323
2324 if (ps->privileges_dropped)
2325 return -EACCES;
2326
2327 if (!connected(ps))
2328 return -ENODEV;
2329
2330 /* alloc buffer */
2331 size = _IOC_SIZE(ctl->ioctl_code);
2332 if (size > 0) {
2333 buf = kmalloc(size, GFP_KERNEL);
2334 if (buf == NULL)
2335 return -ENOMEM;
2336 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2337 if (copy_from_user(buf, ctl->data, size)) {
2338 kfree(buf);
2339 return -EFAULT;
2340 }
2341 } else {
2342 memset(buf, 0, size);
2343 }
2344 }
2345
2346 if (ps->dev->state != USB_STATE_CONFIGURED)
2347 retval = -EHOSTUNREACH;
2348 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2349 retval = -EINVAL;
2350 else switch (ctl->ioctl_code) {
2351
2352 /* disconnect kernel driver from interface */
2353 case USBDEVFS_DISCONNECT:
2354 if (intf->dev.driver) {
2355 driver = to_usb_driver(intf->dev.driver);
2356 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2357 usb_driver_release_interface(driver, intf);
2358 } else
2359 retval = -ENODATA;
2360 break;
2361
2362 /* let kernel drivers try to (re)bind to the interface */
2363 case USBDEVFS_CONNECT:
2364 if (!intf->dev.driver)
2365 retval = device_attach(&intf->dev);
2366 else
2367 retval = -EBUSY;
2368 break;
2369
2370 /* talk directly to the interface's driver */
2371 default:
2372 if (intf->dev.driver)
2373 driver = to_usb_driver(intf->dev.driver);
2374 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2375 retval = -ENOTTY;
2376 } else {
2377 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2378 if (retval == -ENOIOCTLCMD)
2379 retval = -ENOTTY;
2380 }
2381 }
2382
2383 /* cleanup and return */
2384 if (retval >= 0
2385 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2386 && size > 0
2387 && copy_to_user(ctl->data, buf, size) != 0)
2388 retval = -EFAULT;
2389
2390 kfree(buf);
2391 return retval;
2392}
2393
2394static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2395{
2396 struct usbdevfs_ioctl ctrl;
2397
2398 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2399 return -EFAULT;
2400 return proc_ioctl(ps, &ctrl);
2401}
2402
2403#ifdef CONFIG_COMPAT
2404static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2405{
2406 struct usbdevfs_ioctl32 ioc32;
2407 struct usbdevfs_ioctl ctrl;
2408
2409 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2410 return -EFAULT;
2411 ctrl.ifno = ioc32.ifno;
2412 ctrl.ioctl_code = ioc32.ioctl_code;
2413 ctrl.data = compat_ptr(ioc32.data);
2414 return proc_ioctl(ps, &ctrl);
2415}
2416#endif
2417
2418static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2419{
2420 unsigned portnum;
2421 int rc;
2422
2423 if (get_user(portnum, (unsigned __user *) arg))
2424 return -EFAULT;
2425 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2426 if (rc == 0)
2427 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2428 portnum, task_pid_nr(current), current->comm);
2429 return rc;
2430}
2431
2432static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2433{
2434 unsigned portnum;
2435
2436 if (get_user(portnum, (unsigned __user *) arg))
2437 return -EFAULT;
2438 return usb_hub_release_port(ps->dev, portnum, ps);
2439}
2440
2441static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2442{
2443 __u32 caps;
2444
2445 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2446 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2447 USBDEVFS_CAP_DROP_PRIVILEGES |
2448 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2449 if (!ps->dev->bus->no_stop_on_short)
2450 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2451 if (ps->dev->bus->sg_tablesize)
2452 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2453
2454 if (put_user(caps, (__u32 __user *)arg))
2455 return -EFAULT;
2456
2457 return 0;
2458}
2459
2460static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2461{
2462 struct usbdevfs_disconnect_claim dc;
2463 struct usb_interface *intf;
2464
2465 if (copy_from_user(&dc, arg, sizeof(dc)))
2466 return -EFAULT;
2467
2468 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2469 if (!intf)
2470 return -EINVAL;
2471
2472 if (intf->dev.driver) {
2473 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2474
2475 if (ps->privileges_dropped)
2476 return -EACCES;
2477
2478 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2479 strncmp(dc.driver, intf->dev.driver->name,
2480 sizeof(dc.driver)) != 0)
2481 return -EBUSY;
2482
2483 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2484 strncmp(dc.driver, intf->dev.driver->name,
2485 sizeof(dc.driver)) == 0)
2486 return -EBUSY;
2487
2488 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2489 usb_driver_release_interface(driver, intf);
2490 }
2491
2492 return claimintf(ps, dc.interface);
2493}
2494
2495static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2496{
2497 unsigned num_streams, num_eps;
2498 struct usb_host_endpoint **eps;
2499 struct usb_interface *intf;
2500 int r;
2501
2502 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2503 &eps, &intf);
2504 if (r)
2505 return r;
2506
2507 destroy_async_on_interface(ps,
2508 intf->altsetting[0].desc.bInterfaceNumber);
2509
2510 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2511 kfree(eps);
2512 return r;
2513}
2514
2515static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2516{
2517 unsigned num_eps;
2518 struct usb_host_endpoint **eps;
2519 struct usb_interface *intf;
2520 int r;
2521
2522 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2523 if (r)
2524 return r;
2525
2526 destroy_async_on_interface(ps,
2527 intf->altsetting[0].desc.bInterfaceNumber);
2528
2529 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2530 kfree(eps);
2531 return r;
2532}
2533
2534static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2535{
2536 u32 data;
2537
2538 if (copy_from_user(&data, arg, sizeof(data)))
2539 return -EFAULT;
2540
2541 /* This is a one way operation. Once privileges are
2542 * dropped, you cannot regain them. You may however reissue
2543 * this ioctl to shrink the allowed interfaces mask.
2544 */
2545 ps->interface_allowed_mask &= data;
2546 ps->privileges_dropped = true;
2547
2548 return 0;
2549}
2550
2551static int proc_forbid_suspend(struct usb_dev_state *ps)
2552{
2553 int ret = 0;
2554
2555 if (ps->suspend_allowed) {
2556 ret = usb_autoresume_device(ps->dev);
2557 if (ret == 0)
2558 ps->suspend_allowed = false;
2559 else if (ret != -ENODEV)
2560 ret = -EIO;
2561 }
2562 return ret;
2563}
2564
2565static int proc_allow_suspend(struct usb_dev_state *ps)
2566{
2567 if (!connected(ps))
2568 return -ENODEV;
2569
2570 WRITE_ONCE(ps->not_yet_resumed, 1);
2571 if (!ps->suspend_allowed) {
2572 usb_autosuspend_device(ps->dev);
2573 ps->suspend_allowed = true;
2574 }
2575 return 0;
2576}
2577
2578static int proc_wait_for_resume(struct usb_dev_state *ps)
2579{
2580 int ret;
2581
2582 usb_unlock_device(ps->dev);
2583 ret = wait_event_interruptible(ps->wait_for_resume,
2584 READ_ONCE(ps->not_yet_resumed) == 0);
2585 usb_lock_device(ps->dev);
2586
2587 if (ret != 0)
2588 return -EINTR;
2589 return proc_forbid_suspend(ps);
2590}
2591
2592/*
2593 * NOTE: All requests here that have interface numbers as parameters
2594 * are assuming that somehow the configuration has been prevented from
2595 * changing. But there's no mechanism to ensure that...
2596 */
2597static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2598 void __user *p)
2599{
2600 struct usb_dev_state *ps = file->private_data;
2601 struct inode *inode = file_inode(file);
2602 struct usb_device *dev = ps->dev;
2603 int ret = -ENOTTY;
2604
2605 if (!(file->f_mode & FMODE_WRITE))
2606 return -EPERM;
2607
2608 usb_lock_device(dev);
2609
2610 /* Reap operations are allowed even after disconnection */
2611 switch (cmd) {
2612 case USBDEVFS_REAPURB:
2613 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2614 ret = proc_reapurb(ps, p);
2615 goto done;
2616
2617 case USBDEVFS_REAPURBNDELAY:
2618 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2619 ret = proc_reapurbnonblock(ps, p);
2620 goto done;
2621
2622#ifdef CONFIG_COMPAT
2623 case USBDEVFS_REAPURB32:
2624 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2625 ret = proc_reapurb_compat(ps, p);
2626 goto done;
2627
2628 case USBDEVFS_REAPURBNDELAY32:
2629 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2630 ret = proc_reapurbnonblock_compat(ps, p);
2631 goto done;
2632#endif
2633 }
2634
2635 if (!connected(ps)) {
2636 usb_unlock_device(dev);
2637 return -ENODEV;
2638 }
2639
2640 switch (cmd) {
2641 case USBDEVFS_CONTROL:
2642 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2643 ret = proc_control(ps, p);
2644 if (ret >= 0)
2645 inode_set_mtime_to_ts(inode,
2646 inode_set_ctime_current(inode));
2647 break;
2648
2649 case USBDEVFS_BULK:
2650 snoop(&dev->dev, "%s: BULK\n", __func__);
2651 ret = proc_bulk(ps, p);
2652 if (ret >= 0)
2653 inode_set_mtime_to_ts(inode,
2654 inode_set_ctime_current(inode));
2655 break;
2656
2657 case USBDEVFS_RESETEP:
2658 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2659 ret = proc_resetep(ps, p);
2660 if (ret >= 0)
2661 inode_set_mtime_to_ts(inode,
2662 inode_set_ctime_current(inode));
2663 break;
2664
2665 case USBDEVFS_RESET:
2666 snoop(&dev->dev, "%s: RESET\n", __func__);
2667 ret = proc_resetdevice(ps);
2668 break;
2669
2670 case USBDEVFS_CLEAR_HALT:
2671 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2672 ret = proc_clearhalt(ps, p);
2673 if (ret >= 0)
2674 inode_set_mtime_to_ts(inode,
2675 inode_set_ctime_current(inode));
2676 break;
2677
2678 case USBDEVFS_GETDRIVER:
2679 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2680 ret = proc_getdriver(ps, p);
2681 break;
2682
2683 case USBDEVFS_CONNECTINFO:
2684 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2685 ret = proc_connectinfo(ps, p);
2686 break;
2687
2688 case USBDEVFS_SETINTERFACE:
2689 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2690 ret = proc_setintf(ps, p);
2691 break;
2692
2693 case USBDEVFS_SETCONFIGURATION:
2694 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2695 ret = proc_setconfig(ps, p);
2696 break;
2697
2698 case USBDEVFS_SUBMITURB:
2699 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2700 ret = proc_submiturb(ps, p);
2701 if (ret >= 0)
2702 inode_set_mtime_to_ts(inode,
2703 inode_set_ctime_current(inode));
2704 break;
2705
2706#ifdef CONFIG_COMPAT
2707 case USBDEVFS_CONTROL32:
2708 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2709 ret = proc_control_compat(ps, p);
2710 if (ret >= 0)
2711 inode_set_mtime_to_ts(inode,
2712 inode_set_ctime_current(inode));
2713 break;
2714
2715 case USBDEVFS_BULK32:
2716 snoop(&dev->dev, "%s: BULK32\n", __func__);
2717 ret = proc_bulk_compat(ps, p);
2718 if (ret >= 0)
2719 inode_set_mtime_to_ts(inode,
2720 inode_set_ctime_current(inode));
2721 break;
2722
2723 case USBDEVFS_DISCSIGNAL32:
2724 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2725 ret = proc_disconnectsignal_compat(ps, p);
2726 break;
2727
2728 case USBDEVFS_SUBMITURB32:
2729 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2730 ret = proc_submiturb_compat(ps, p);
2731 if (ret >= 0)
2732 inode_set_mtime_to_ts(inode,
2733 inode_set_ctime_current(inode));
2734 break;
2735
2736 case USBDEVFS_IOCTL32:
2737 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2738 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2739 break;
2740#endif
2741
2742 case USBDEVFS_DISCARDURB:
2743 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2744 ret = proc_unlinkurb(ps, p);
2745 break;
2746
2747 case USBDEVFS_DISCSIGNAL:
2748 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2749 ret = proc_disconnectsignal(ps, p);
2750 break;
2751
2752 case USBDEVFS_CLAIMINTERFACE:
2753 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2754 ret = proc_claiminterface(ps, p);
2755 break;
2756
2757 case USBDEVFS_RELEASEINTERFACE:
2758 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2759 ret = proc_releaseinterface(ps, p);
2760 break;
2761
2762 case USBDEVFS_IOCTL:
2763 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2764 ret = proc_ioctl_default(ps, p);
2765 break;
2766
2767 case USBDEVFS_CLAIM_PORT:
2768 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2769 ret = proc_claim_port(ps, p);
2770 break;
2771
2772 case USBDEVFS_RELEASE_PORT:
2773 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2774 ret = proc_release_port(ps, p);
2775 break;
2776 case USBDEVFS_GET_CAPABILITIES:
2777 ret = proc_get_capabilities(ps, p);
2778 break;
2779 case USBDEVFS_DISCONNECT_CLAIM:
2780 ret = proc_disconnect_claim(ps, p);
2781 break;
2782 case USBDEVFS_ALLOC_STREAMS:
2783 ret = proc_alloc_streams(ps, p);
2784 break;
2785 case USBDEVFS_FREE_STREAMS:
2786 ret = proc_free_streams(ps, p);
2787 break;
2788 case USBDEVFS_DROP_PRIVILEGES:
2789 ret = proc_drop_privileges(ps, p);
2790 break;
2791 case USBDEVFS_GET_SPEED:
2792 ret = ps->dev->speed;
2793 break;
2794 case USBDEVFS_FORBID_SUSPEND:
2795 ret = proc_forbid_suspend(ps);
2796 break;
2797 case USBDEVFS_ALLOW_SUSPEND:
2798 ret = proc_allow_suspend(ps);
2799 break;
2800 case USBDEVFS_WAIT_FOR_RESUME:
2801 ret = proc_wait_for_resume(ps);
2802 break;
2803 }
2804
2805 /* Handle variable-length commands */
2806 switch (cmd & ~IOCSIZE_MASK) {
2807 case USBDEVFS_CONNINFO_EX(0):
2808 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2809 break;
2810 }
2811
2812 done:
2813 usb_unlock_device(dev);
2814 if (ret >= 0)
2815 inode_set_atime_to_ts(inode, current_time(inode));
2816 return ret;
2817}
2818
2819static long usbdev_ioctl(struct file *file, unsigned int cmd,
2820 unsigned long arg)
2821{
2822 int ret;
2823
2824 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2825
2826 return ret;
2827}
2828
2829/* No kernel lock - fine */
2830static __poll_t usbdev_poll(struct file *file,
2831 struct poll_table_struct *wait)
2832{
2833 struct usb_dev_state *ps = file->private_data;
2834 __poll_t mask = 0;
2835
2836 poll_wait(file, &ps->wait, wait);
2837 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2838 mask |= EPOLLOUT | EPOLLWRNORM;
2839 if (!connected(ps))
2840 mask |= EPOLLHUP;
2841 if (list_empty(&ps->list))
2842 mask |= EPOLLERR;
2843 return mask;
2844}
2845
2846const struct file_operations usbdev_file_operations = {
2847 .owner = THIS_MODULE,
2848 .llseek = no_seek_end_llseek,
2849 .read = usbdev_read,
2850 .poll = usbdev_poll,
2851 .unlocked_ioctl = usbdev_ioctl,
2852 .compat_ioctl = compat_ptr_ioctl,
2853 .mmap = usbdev_mmap,
2854 .open = usbdev_open,
2855 .release = usbdev_release,
2856};
2857
2858static void usbdev_remove(struct usb_device *udev)
2859{
2860 struct usb_dev_state *ps;
2861
2862 /* Protect against simultaneous resume */
2863 mutex_lock(&usbfs_mutex);
2864 while (!list_empty(&udev->filelist)) {
2865 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2866 destroy_all_async(ps);
2867 wake_up_all(&ps->wait);
2868 WRITE_ONCE(ps->not_yet_resumed, 0);
2869 wake_up_all(&ps->wait_for_resume);
2870 list_del_init(&ps->list);
2871 if (ps->discsignr)
2872 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2873 ps->disc_pid, ps->cred);
2874 }
2875 mutex_unlock(&usbfs_mutex);
2876}
2877
2878static int usbdev_notify(struct notifier_block *self,
2879 unsigned long action, void *dev)
2880{
2881 switch (action) {
2882 case USB_DEVICE_ADD:
2883 break;
2884 case USB_DEVICE_REMOVE:
2885 usbdev_remove(dev);
2886 break;
2887 }
2888 return NOTIFY_OK;
2889}
2890
2891static struct notifier_block usbdev_nb = {
2892 .notifier_call = usbdev_notify,
2893};
2894
2895static struct cdev usb_device_cdev;
2896
2897int __init usb_devio_init(void)
2898{
2899 int retval;
2900
2901 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2902 "usb_device");
2903 if (retval) {
2904 printk(KERN_ERR "Unable to register minors for usb_device\n");
2905 goto out;
2906 }
2907 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2908 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2909 if (retval) {
2910 printk(KERN_ERR "Unable to get usb_device major %d\n",
2911 USB_DEVICE_MAJOR);
2912 goto error_cdev;
2913 }
2914 usb_register_notify(&usbdev_nb);
2915out:
2916 return retval;
2917
2918error_cdev:
2919 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2920 goto out;
2921}
2922
2923void usb_devio_cleanup(void)
2924{
2925 usb_unregister_notify(&usbdev_nb);
2926 cdev_del(&usb_device_cdev);
2927 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2928}
1/*****************************************************************************/
2
3/*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35/*****************************************************************************/
36
37#include <linux/fs.h>
38#include <linux/mm.h>
39#include <linux/slab.h>
40#include <linux/signal.h>
41#include <linux/poll.h>
42#include <linux/module.h>
43#include <linux/string.h>
44#include <linux/usb.h>
45#include <linux/usbdevice_fs.h>
46#include <linux/usb/hcd.h> /* for usbcore internals */
47#include <linux/cdev.h>
48#include <linux/notifier.h>
49#include <linux/security.h>
50#include <linux/user_namespace.h>
51#include <linux/scatterlist.h>
52#include <linux/uaccess.h>
53#include <linux/dma-mapping.h>
54#include <asm/byteorder.h>
55#include <linux/moduleparam.h>
56
57#include "usb.h"
58
59#define USB_MAXBUS 64
60#define USB_DEVICE_MAX (USB_MAXBUS * 128)
61#define USB_SG_SIZE 16384 /* split-size for large txs */
62
63/* Mutual exclusion for removal, open, and release */
64DEFINE_MUTEX(usbfs_mutex);
65
66struct usb_dev_state {
67 struct list_head list; /* state list */
68 struct usb_device *dev;
69 struct file *file;
70 spinlock_t lock; /* protects the async urb lists */
71 struct list_head async_pending;
72 struct list_head async_completed;
73 struct list_head memory_list;
74 wait_queue_head_t wait; /* wake up if a request completed */
75 unsigned int discsignr;
76 struct pid *disc_pid;
77 const struct cred *cred;
78 void __user *disccontext;
79 unsigned long ifclaimed;
80 u32 secid;
81 u32 disabled_bulk_eps;
82 bool privileges_dropped;
83 unsigned long interface_allowed_mask;
84};
85
86struct usb_memory {
87 struct list_head memlist;
88 int vma_use_count;
89 int urb_use_count;
90 u32 size;
91 void *mem;
92 dma_addr_t dma_handle;
93 unsigned long vm_start;
94 struct usb_dev_state *ps;
95};
96
97struct async {
98 struct list_head asynclist;
99 struct usb_dev_state *ps;
100 struct pid *pid;
101 const struct cred *cred;
102 unsigned int signr;
103 unsigned int ifnum;
104 void __user *userbuffer;
105 void __user *userurb;
106 struct urb *urb;
107 struct usb_memory *usbm;
108 unsigned int mem_usage;
109 int status;
110 u32 secid;
111 u8 bulk_addr;
112 u8 bulk_status;
113};
114
115static bool usbfs_snoop;
116module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
117MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
118
119static unsigned usbfs_snoop_max = 65536;
120module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
121MODULE_PARM_DESC(usbfs_snoop_max,
122 "maximum number of bytes to print while snooping");
123
124#define snoop(dev, format, arg...) \
125 do { \
126 if (usbfs_snoop) \
127 dev_info(dev, format, ## arg); \
128 } while (0)
129
130enum snoop_when {
131 SUBMIT, COMPLETE
132};
133
134#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
135
136/* Limit on the total amount of memory we can allocate for transfers */
137static unsigned usbfs_memory_mb = 16;
138module_param(usbfs_memory_mb, uint, 0644);
139MODULE_PARM_DESC(usbfs_memory_mb,
140 "maximum MB allowed for usbfs buffers (0 = no limit)");
141
142/* Hard limit, necessary to avoid arithmetic overflow */
143#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
144
145static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
146
147/* Check whether it's okay to allocate more memory for a transfer */
148static int usbfs_increase_memory_usage(unsigned amount)
149{
150 unsigned lim;
151
152 /*
153 * Convert usbfs_memory_mb to bytes, avoiding overflows.
154 * 0 means use the hard limit (effectively unlimited).
155 */
156 lim = ACCESS_ONCE(usbfs_memory_mb);
157 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
158 lim = USBFS_XFER_MAX;
159 else
160 lim <<= 20;
161
162 atomic_add(amount, &usbfs_memory_usage);
163 if (atomic_read(&usbfs_memory_usage) <= lim)
164 return 0;
165 atomic_sub(amount, &usbfs_memory_usage);
166 return -ENOMEM;
167}
168
169/* Memory for a transfer is being deallocated */
170static void usbfs_decrease_memory_usage(unsigned amount)
171{
172 atomic_sub(amount, &usbfs_memory_usage);
173}
174
175static int connected(struct usb_dev_state *ps)
176{
177 return (!list_empty(&ps->list) &&
178 ps->dev->state != USB_STATE_NOTATTACHED);
179}
180
181static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
182{
183 struct usb_dev_state *ps = usbm->ps;
184 unsigned long flags;
185
186 spin_lock_irqsave(&ps->lock, flags);
187 --*count;
188 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
189 list_del(&usbm->memlist);
190 spin_unlock_irqrestore(&ps->lock, flags);
191
192 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
193 usbm->dma_handle);
194 usbfs_decrease_memory_usage(
195 usbm->size + sizeof(struct usb_memory));
196 kfree(usbm);
197 } else {
198 spin_unlock_irqrestore(&ps->lock, flags);
199 }
200}
201
202static void usbdev_vm_open(struct vm_area_struct *vma)
203{
204 struct usb_memory *usbm = vma->vm_private_data;
205 unsigned long flags;
206
207 spin_lock_irqsave(&usbm->ps->lock, flags);
208 ++usbm->vma_use_count;
209 spin_unlock_irqrestore(&usbm->ps->lock, flags);
210}
211
212static void usbdev_vm_close(struct vm_area_struct *vma)
213{
214 struct usb_memory *usbm = vma->vm_private_data;
215
216 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
217}
218
219struct vm_operations_struct usbdev_vm_ops = {
220 .open = usbdev_vm_open,
221 .close = usbdev_vm_close
222};
223
224static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
225{
226 struct usb_memory *usbm = NULL;
227 struct usb_dev_state *ps = file->private_data;
228 size_t size = vma->vm_end - vma->vm_start;
229 void *mem;
230 unsigned long flags;
231 dma_addr_t dma_handle;
232 int ret;
233
234 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
235 if (ret)
236 goto error;
237
238 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
239 if (!usbm) {
240 ret = -ENOMEM;
241 goto error_decrease_mem;
242 }
243
244 mem = usb_alloc_coherent(ps->dev, size, GFP_USER, &dma_handle);
245 if (!mem) {
246 ret = -ENOMEM;
247 goto error_free_usbm;
248 }
249
250 memset(mem, 0, size);
251
252 usbm->mem = mem;
253 usbm->dma_handle = dma_handle;
254 usbm->size = size;
255 usbm->ps = ps;
256 usbm->vm_start = vma->vm_start;
257 usbm->vma_use_count = 1;
258 INIT_LIST_HEAD(&usbm->memlist);
259
260 if (remap_pfn_range(vma, vma->vm_start,
261 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
262 size, vma->vm_page_prot) < 0) {
263 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
264 return -EAGAIN;
265 }
266
267 vma->vm_flags |= VM_IO;
268 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
269 vma->vm_ops = &usbdev_vm_ops;
270 vma->vm_private_data = usbm;
271
272 spin_lock_irqsave(&ps->lock, flags);
273 list_add_tail(&usbm->memlist, &ps->memory_list);
274 spin_unlock_irqrestore(&ps->lock, flags);
275
276 return 0;
277
278error_free_usbm:
279 kfree(usbm);
280error_decrease_mem:
281 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
282error:
283 return ret;
284}
285
286static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
287 loff_t *ppos)
288{
289 struct usb_dev_state *ps = file->private_data;
290 struct usb_device *dev = ps->dev;
291 ssize_t ret = 0;
292 unsigned len;
293 loff_t pos;
294 int i;
295
296 pos = *ppos;
297 usb_lock_device(dev);
298 if (!connected(ps)) {
299 ret = -ENODEV;
300 goto err;
301 } else if (pos < 0) {
302 ret = -EINVAL;
303 goto err;
304 }
305
306 if (pos < sizeof(struct usb_device_descriptor)) {
307 /* 18 bytes - fits on the stack */
308 struct usb_device_descriptor temp_desc;
309
310 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
311 le16_to_cpus(&temp_desc.bcdUSB);
312 le16_to_cpus(&temp_desc.idVendor);
313 le16_to_cpus(&temp_desc.idProduct);
314 le16_to_cpus(&temp_desc.bcdDevice);
315
316 len = sizeof(struct usb_device_descriptor) - pos;
317 if (len > nbytes)
318 len = nbytes;
319 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
320 ret = -EFAULT;
321 goto err;
322 }
323
324 *ppos += len;
325 buf += len;
326 nbytes -= len;
327 ret += len;
328 }
329
330 pos = sizeof(struct usb_device_descriptor);
331 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
332 struct usb_config_descriptor *config =
333 (struct usb_config_descriptor *)dev->rawdescriptors[i];
334 unsigned int length = le16_to_cpu(config->wTotalLength);
335
336 if (*ppos < pos + length) {
337
338 /* The descriptor may claim to be longer than it
339 * really is. Here is the actual allocated length. */
340 unsigned alloclen =
341 le16_to_cpu(dev->config[i].desc.wTotalLength);
342
343 len = length - (*ppos - pos);
344 if (len > nbytes)
345 len = nbytes;
346
347 /* Simply don't write (skip over) unallocated parts */
348 if (alloclen > (*ppos - pos)) {
349 alloclen -= (*ppos - pos);
350 if (copy_to_user(buf,
351 dev->rawdescriptors[i] + (*ppos - pos),
352 min(len, alloclen))) {
353 ret = -EFAULT;
354 goto err;
355 }
356 }
357
358 *ppos += len;
359 buf += len;
360 nbytes -= len;
361 ret += len;
362 }
363
364 pos += length;
365 }
366
367err:
368 usb_unlock_device(dev);
369 return ret;
370}
371
372/*
373 * async list handling
374 */
375
376static struct async *alloc_async(unsigned int numisoframes)
377{
378 struct async *as;
379
380 as = kzalloc(sizeof(struct async), GFP_KERNEL);
381 if (!as)
382 return NULL;
383 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
384 if (!as->urb) {
385 kfree(as);
386 return NULL;
387 }
388 return as;
389}
390
391static void free_async(struct async *as)
392{
393 int i;
394
395 put_pid(as->pid);
396 if (as->cred)
397 put_cred(as->cred);
398 for (i = 0; i < as->urb->num_sgs; i++) {
399 if (sg_page(&as->urb->sg[i]))
400 kfree(sg_virt(&as->urb->sg[i]));
401 }
402
403 kfree(as->urb->sg);
404 if (as->usbm == NULL)
405 kfree(as->urb->transfer_buffer);
406 else
407 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
408
409 kfree(as->urb->setup_packet);
410 usb_free_urb(as->urb);
411 usbfs_decrease_memory_usage(as->mem_usage);
412 kfree(as);
413}
414
415static void async_newpending(struct async *as)
416{
417 struct usb_dev_state *ps = as->ps;
418 unsigned long flags;
419
420 spin_lock_irqsave(&ps->lock, flags);
421 list_add_tail(&as->asynclist, &ps->async_pending);
422 spin_unlock_irqrestore(&ps->lock, flags);
423}
424
425static void async_removepending(struct async *as)
426{
427 struct usb_dev_state *ps = as->ps;
428 unsigned long flags;
429
430 spin_lock_irqsave(&ps->lock, flags);
431 list_del_init(&as->asynclist);
432 spin_unlock_irqrestore(&ps->lock, flags);
433}
434
435static struct async *async_getcompleted(struct usb_dev_state *ps)
436{
437 unsigned long flags;
438 struct async *as = NULL;
439
440 spin_lock_irqsave(&ps->lock, flags);
441 if (!list_empty(&ps->async_completed)) {
442 as = list_entry(ps->async_completed.next, struct async,
443 asynclist);
444 list_del_init(&as->asynclist);
445 }
446 spin_unlock_irqrestore(&ps->lock, flags);
447 return as;
448}
449
450static struct async *async_getpending(struct usb_dev_state *ps,
451 void __user *userurb)
452{
453 struct async *as;
454
455 list_for_each_entry(as, &ps->async_pending, asynclist)
456 if (as->userurb == userurb) {
457 list_del_init(&as->asynclist);
458 return as;
459 }
460
461 return NULL;
462}
463
464static void snoop_urb(struct usb_device *udev,
465 void __user *userurb, int pipe, unsigned length,
466 int timeout_or_status, enum snoop_when when,
467 unsigned char *data, unsigned data_len)
468{
469 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
470 static const char *dirs[] = {"out", "in"};
471 int ep;
472 const char *t, *d;
473
474 if (!usbfs_snoop)
475 return;
476
477 ep = usb_pipeendpoint(pipe);
478 t = types[usb_pipetype(pipe)];
479 d = dirs[!!usb_pipein(pipe)];
480
481 if (userurb) { /* Async */
482 if (when == SUBMIT)
483 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
484 "length %u\n",
485 userurb, ep, t, d, length);
486 else
487 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
488 "actual_length %u status %d\n",
489 userurb, ep, t, d, length,
490 timeout_or_status);
491 } else {
492 if (when == SUBMIT)
493 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
494 "timeout %d\n",
495 ep, t, d, length, timeout_or_status);
496 else
497 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
498 "status %d\n",
499 ep, t, d, length, timeout_or_status);
500 }
501
502 data_len = min(data_len, usbfs_snoop_max);
503 if (data && data_len > 0) {
504 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
505 data, data_len, 1);
506 }
507}
508
509static void snoop_urb_data(struct urb *urb, unsigned len)
510{
511 int i, size;
512
513 len = min(len, usbfs_snoop_max);
514 if (!usbfs_snoop || len == 0)
515 return;
516
517 if (urb->num_sgs == 0) {
518 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
519 urb->transfer_buffer, len, 1);
520 return;
521 }
522
523 for (i = 0; i < urb->num_sgs && len; i++) {
524 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
525 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
526 sg_virt(&urb->sg[i]), size, 1);
527 len -= size;
528 }
529}
530
531static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
532{
533 unsigned i, len, size;
534
535 if (urb->number_of_packets > 0) /* Isochronous */
536 len = urb->transfer_buffer_length;
537 else /* Non-Isoc */
538 len = urb->actual_length;
539
540 if (urb->num_sgs == 0) {
541 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
542 return -EFAULT;
543 return 0;
544 }
545
546 for (i = 0; i < urb->num_sgs && len; i++) {
547 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
548 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
549 return -EFAULT;
550 userbuffer += size;
551 len -= size;
552 }
553
554 return 0;
555}
556
557#define AS_CONTINUATION 1
558#define AS_UNLINK 2
559
560static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
561__releases(ps->lock)
562__acquires(ps->lock)
563{
564 struct urb *urb;
565 struct async *as;
566
567 /* Mark all the pending URBs that match bulk_addr, up to but not
568 * including the first one without AS_CONTINUATION. If such an
569 * URB is encountered then a new transfer has already started so
570 * the endpoint doesn't need to be disabled; otherwise it does.
571 */
572 list_for_each_entry(as, &ps->async_pending, asynclist) {
573 if (as->bulk_addr == bulk_addr) {
574 if (as->bulk_status != AS_CONTINUATION)
575 goto rescan;
576 as->bulk_status = AS_UNLINK;
577 as->bulk_addr = 0;
578 }
579 }
580 ps->disabled_bulk_eps |= (1 << bulk_addr);
581
582 /* Now carefully unlink all the marked pending URBs */
583 rescan:
584 list_for_each_entry(as, &ps->async_pending, asynclist) {
585 if (as->bulk_status == AS_UNLINK) {
586 as->bulk_status = 0; /* Only once */
587 urb = as->urb;
588 usb_get_urb(urb);
589 spin_unlock(&ps->lock); /* Allow completions */
590 usb_unlink_urb(urb);
591 usb_put_urb(urb);
592 spin_lock(&ps->lock);
593 goto rescan;
594 }
595 }
596}
597
598static void async_completed(struct urb *urb)
599{
600 struct async *as = urb->context;
601 struct usb_dev_state *ps = as->ps;
602 struct siginfo sinfo;
603 struct pid *pid = NULL;
604 u32 secid = 0;
605 const struct cred *cred = NULL;
606 int signr;
607
608 spin_lock(&ps->lock);
609 list_move_tail(&as->asynclist, &ps->async_completed);
610 as->status = urb->status;
611 signr = as->signr;
612 if (signr) {
613 memset(&sinfo, 0, sizeof(sinfo));
614 sinfo.si_signo = as->signr;
615 sinfo.si_errno = as->status;
616 sinfo.si_code = SI_ASYNCIO;
617 sinfo.si_addr = as->userurb;
618 pid = get_pid(as->pid);
619 cred = get_cred(as->cred);
620 secid = as->secid;
621 }
622 snoop(&urb->dev->dev, "urb complete\n");
623 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
624 as->status, COMPLETE, NULL, 0);
625 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
626 snoop_urb_data(urb, urb->actual_length);
627
628 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
629 as->status != -ENOENT)
630 cancel_bulk_urbs(ps, as->bulk_addr);
631 spin_unlock(&ps->lock);
632
633 if (signr) {
634 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
635 put_pid(pid);
636 put_cred(cred);
637 }
638
639 wake_up(&ps->wait);
640}
641
642static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
643{
644 struct urb *urb;
645 struct async *as;
646 unsigned long flags;
647
648 spin_lock_irqsave(&ps->lock, flags);
649 while (!list_empty(list)) {
650 as = list_entry(list->next, struct async, asynclist);
651 list_del_init(&as->asynclist);
652 urb = as->urb;
653 usb_get_urb(urb);
654
655 /* drop the spinlock so the completion handler can run */
656 spin_unlock_irqrestore(&ps->lock, flags);
657 usb_kill_urb(urb);
658 usb_put_urb(urb);
659 spin_lock_irqsave(&ps->lock, flags);
660 }
661 spin_unlock_irqrestore(&ps->lock, flags);
662}
663
664static void destroy_async_on_interface(struct usb_dev_state *ps,
665 unsigned int ifnum)
666{
667 struct list_head *p, *q, hitlist;
668 unsigned long flags;
669
670 INIT_LIST_HEAD(&hitlist);
671 spin_lock_irqsave(&ps->lock, flags);
672 list_for_each_safe(p, q, &ps->async_pending)
673 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
674 list_move_tail(p, &hitlist);
675 spin_unlock_irqrestore(&ps->lock, flags);
676 destroy_async(ps, &hitlist);
677}
678
679static void destroy_all_async(struct usb_dev_state *ps)
680{
681 destroy_async(ps, &ps->async_pending);
682}
683
684/*
685 * interface claims are made only at the request of user level code,
686 * which can also release them (explicitly or by closing files).
687 * they're also undone when devices disconnect.
688 */
689
690static int driver_probe(struct usb_interface *intf,
691 const struct usb_device_id *id)
692{
693 return -ENODEV;
694}
695
696static void driver_disconnect(struct usb_interface *intf)
697{
698 struct usb_dev_state *ps = usb_get_intfdata(intf);
699 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
700
701 if (!ps)
702 return;
703
704 /* NOTE: this relies on usbcore having canceled and completed
705 * all pending I/O requests; 2.6 does that.
706 */
707
708 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
709 clear_bit(ifnum, &ps->ifclaimed);
710 else
711 dev_warn(&intf->dev, "interface number %u out of range\n",
712 ifnum);
713
714 usb_set_intfdata(intf, NULL);
715
716 /* force async requests to complete */
717 destroy_async_on_interface(ps, ifnum);
718}
719
720/* The following routines are merely placeholders. There is no way
721 * to inform a user task about suspend or resumes.
722 */
723static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
724{
725 return 0;
726}
727
728static int driver_resume(struct usb_interface *intf)
729{
730 return 0;
731}
732
733struct usb_driver usbfs_driver = {
734 .name = "usbfs",
735 .probe = driver_probe,
736 .disconnect = driver_disconnect,
737 .suspend = driver_suspend,
738 .resume = driver_resume,
739};
740
741static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
742{
743 struct usb_device *dev = ps->dev;
744 struct usb_interface *intf;
745 int err;
746
747 if (ifnum >= 8*sizeof(ps->ifclaimed))
748 return -EINVAL;
749 /* already claimed */
750 if (test_bit(ifnum, &ps->ifclaimed))
751 return 0;
752
753 if (ps->privileges_dropped &&
754 !test_bit(ifnum, &ps->interface_allowed_mask))
755 return -EACCES;
756
757 intf = usb_ifnum_to_if(dev, ifnum);
758 if (!intf)
759 err = -ENOENT;
760 else
761 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
762 if (err == 0)
763 set_bit(ifnum, &ps->ifclaimed);
764 return err;
765}
766
767static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
768{
769 struct usb_device *dev;
770 struct usb_interface *intf;
771 int err;
772
773 err = -EINVAL;
774 if (ifnum >= 8*sizeof(ps->ifclaimed))
775 return err;
776 dev = ps->dev;
777 intf = usb_ifnum_to_if(dev, ifnum);
778 if (!intf)
779 err = -ENOENT;
780 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
781 usb_driver_release_interface(&usbfs_driver, intf);
782 err = 0;
783 }
784 return err;
785}
786
787static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
788{
789 if (ps->dev->state != USB_STATE_CONFIGURED)
790 return -EHOSTUNREACH;
791 if (ifnum >= 8*sizeof(ps->ifclaimed))
792 return -EINVAL;
793 if (test_bit(ifnum, &ps->ifclaimed))
794 return 0;
795 /* if not yet claimed, claim it for the driver */
796 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
797 "interface %u before use\n", task_pid_nr(current),
798 current->comm, ifnum);
799 return claimintf(ps, ifnum);
800}
801
802static int findintfep(struct usb_device *dev, unsigned int ep)
803{
804 unsigned int i, j, e;
805 struct usb_interface *intf;
806 struct usb_host_interface *alts;
807 struct usb_endpoint_descriptor *endpt;
808
809 if (ep & ~(USB_DIR_IN|0xf))
810 return -EINVAL;
811 if (!dev->actconfig)
812 return -ESRCH;
813 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
814 intf = dev->actconfig->interface[i];
815 for (j = 0; j < intf->num_altsetting; j++) {
816 alts = &intf->altsetting[j];
817 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
818 endpt = &alts->endpoint[e].desc;
819 if (endpt->bEndpointAddress == ep)
820 return alts->desc.bInterfaceNumber;
821 }
822 }
823 }
824 return -ENOENT;
825}
826
827static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
828 unsigned int request, unsigned int index)
829{
830 int ret = 0;
831 struct usb_host_interface *alt_setting;
832
833 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
834 && ps->dev->state != USB_STATE_ADDRESS
835 && ps->dev->state != USB_STATE_CONFIGURED)
836 return -EHOSTUNREACH;
837 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
838 return 0;
839
840 /*
841 * check for the special corner case 'get_device_id' in the printer
842 * class specification, which we always want to allow as it is used
843 * to query things like ink level, etc.
844 */
845 if (requesttype == 0xa1 && request == 0) {
846 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
847 index >> 8, index & 0xff);
848 if (alt_setting
849 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
850 return 0;
851 }
852
853 index &= 0xff;
854 switch (requesttype & USB_RECIP_MASK) {
855 case USB_RECIP_ENDPOINT:
856 if ((index & ~USB_DIR_IN) == 0)
857 return 0;
858 ret = findintfep(ps->dev, index);
859 if (ret < 0) {
860 /*
861 * Some not fully compliant Win apps seem to get
862 * index wrong and have the endpoint number here
863 * rather than the endpoint address (with the
864 * correct direction). Win does let this through,
865 * so we'll not reject it here but leave it to
866 * the device to not break KVM. But we warn.
867 */
868 ret = findintfep(ps->dev, index ^ 0x80);
869 if (ret >= 0)
870 dev_info(&ps->dev->dev,
871 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
872 __func__, task_pid_nr(current),
873 current->comm, index, index ^ 0x80);
874 }
875 if (ret >= 0)
876 ret = checkintf(ps, ret);
877 break;
878
879 case USB_RECIP_INTERFACE:
880 ret = checkintf(ps, index);
881 break;
882 }
883 return ret;
884}
885
886static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
887 unsigned char ep)
888{
889 if (ep & USB_ENDPOINT_DIR_MASK)
890 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
891 else
892 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
893}
894
895static int parse_usbdevfs_streams(struct usb_dev_state *ps,
896 struct usbdevfs_streams __user *streams,
897 unsigned int *num_streams_ret,
898 unsigned int *num_eps_ret,
899 struct usb_host_endpoint ***eps_ret,
900 struct usb_interface **intf_ret)
901{
902 unsigned int i, num_streams, num_eps;
903 struct usb_host_endpoint **eps;
904 struct usb_interface *intf = NULL;
905 unsigned char ep;
906 int ifnum, ret;
907
908 if (get_user(num_streams, &streams->num_streams) ||
909 get_user(num_eps, &streams->num_eps))
910 return -EFAULT;
911
912 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
913 return -EINVAL;
914
915 /* The XHCI controller allows max 2 ^ 16 streams */
916 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
917 return -EINVAL;
918
919 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
920 if (!eps)
921 return -ENOMEM;
922
923 for (i = 0; i < num_eps; i++) {
924 if (get_user(ep, &streams->eps[i])) {
925 ret = -EFAULT;
926 goto error;
927 }
928 eps[i] = ep_to_host_endpoint(ps->dev, ep);
929 if (!eps[i]) {
930 ret = -EINVAL;
931 goto error;
932 }
933
934 /* usb_alloc/free_streams operate on an usb_interface */
935 ifnum = findintfep(ps->dev, ep);
936 if (ifnum < 0) {
937 ret = ifnum;
938 goto error;
939 }
940
941 if (i == 0) {
942 ret = checkintf(ps, ifnum);
943 if (ret < 0)
944 goto error;
945 intf = usb_ifnum_to_if(ps->dev, ifnum);
946 } else {
947 /* Verify all eps belong to the same interface */
948 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
949 ret = -EINVAL;
950 goto error;
951 }
952 }
953 }
954
955 if (num_streams_ret)
956 *num_streams_ret = num_streams;
957 *num_eps_ret = num_eps;
958 *eps_ret = eps;
959 *intf_ret = intf;
960
961 return 0;
962
963error:
964 kfree(eps);
965 return ret;
966}
967
968static int match_devt(struct device *dev, void *data)
969{
970 return dev->devt == (dev_t) (unsigned long) data;
971}
972
973static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
974{
975 struct device *dev;
976
977 dev = bus_find_device(&usb_bus_type, NULL,
978 (void *) (unsigned long) devt, match_devt);
979 if (!dev)
980 return NULL;
981 return to_usb_device(dev);
982}
983
984/*
985 * file operations
986 */
987static int usbdev_open(struct inode *inode, struct file *file)
988{
989 struct usb_device *dev = NULL;
990 struct usb_dev_state *ps;
991 int ret;
992
993 ret = -ENOMEM;
994 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
995 if (!ps)
996 goto out_free_ps;
997
998 ret = -ENODEV;
999
1000 /* Protect against simultaneous removal or release */
1001 mutex_lock(&usbfs_mutex);
1002
1003 /* usbdev device-node */
1004 if (imajor(inode) == USB_DEVICE_MAJOR)
1005 dev = usbdev_lookup_by_devt(inode->i_rdev);
1006
1007 mutex_unlock(&usbfs_mutex);
1008
1009 if (!dev)
1010 goto out_free_ps;
1011
1012 usb_lock_device(dev);
1013 if (dev->state == USB_STATE_NOTATTACHED)
1014 goto out_unlock_device;
1015
1016 ret = usb_autoresume_device(dev);
1017 if (ret)
1018 goto out_unlock_device;
1019
1020 ps->dev = dev;
1021 ps->file = file;
1022 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1023 spin_lock_init(&ps->lock);
1024 INIT_LIST_HEAD(&ps->list);
1025 INIT_LIST_HEAD(&ps->async_pending);
1026 INIT_LIST_HEAD(&ps->async_completed);
1027 INIT_LIST_HEAD(&ps->memory_list);
1028 init_waitqueue_head(&ps->wait);
1029 ps->disc_pid = get_pid(task_pid(current));
1030 ps->cred = get_current_cred();
1031 security_task_getsecid(current, &ps->secid);
1032 smp_wmb();
1033 list_add_tail(&ps->list, &dev->filelist);
1034 file->private_data = ps;
1035 usb_unlock_device(dev);
1036 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1037 current->comm);
1038 return ret;
1039
1040 out_unlock_device:
1041 usb_unlock_device(dev);
1042 usb_put_dev(dev);
1043 out_free_ps:
1044 kfree(ps);
1045 return ret;
1046}
1047
1048static int usbdev_release(struct inode *inode, struct file *file)
1049{
1050 struct usb_dev_state *ps = file->private_data;
1051 struct usb_device *dev = ps->dev;
1052 unsigned int ifnum;
1053 struct async *as;
1054
1055 usb_lock_device(dev);
1056 usb_hub_release_all_ports(dev, ps);
1057
1058 list_del_init(&ps->list);
1059
1060 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1061 ifnum++) {
1062 if (test_bit(ifnum, &ps->ifclaimed))
1063 releaseintf(ps, ifnum);
1064 }
1065 destroy_all_async(ps);
1066 usb_autosuspend_device(dev);
1067 usb_unlock_device(dev);
1068 usb_put_dev(dev);
1069 put_pid(ps->disc_pid);
1070 put_cred(ps->cred);
1071
1072 as = async_getcompleted(ps);
1073 while (as) {
1074 free_async(as);
1075 as = async_getcompleted(ps);
1076 }
1077
1078 kfree(ps);
1079 return 0;
1080}
1081
1082static int proc_control(struct usb_dev_state *ps, void __user *arg)
1083{
1084 struct usb_device *dev = ps->dev;
1085 struct usbdevfs_ctrltransfer ctrl;
1086 unsigned int tmo;
1087 unsigned char *tbuf;
1088 unsigned wLength;
1089 int i, pipe, ret;
1090
1091 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1092 return -EFAULT;
1093 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1094 ctrl.wIndex);
1095 if (ret)
1096 return ret;
1097 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1098 if (wLength > PAGE_SIZE)
1099 return -EINVAL;
1100 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1101 sizeof(struct usb_ctrlrequest));
1102 if (ret)
1103 return ret;
1104 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1105 if (!tbuf) {
1106 ret = -ENOMEM;
1107 goto done;
1108 }
1109 tmo = ctrl.timeout;
1110 snoop(&dev->dev, "control urb: bRequestType=%02x "
1111 "bRequest=%02x wValue=%04x "
1112 "wIndex=%04x wLength=%04x\n",
1113 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1114 ctrl.wIndex, ctrl.wLength);
1115 if (ctrl.bRequestType & 0x80) {
1116 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1117 ctrl.wLength)) {
1118 ret = -EINVAL;
1119 goto done;
1120 }
1121 pipe = usb_rcvctrlpipe(dev, 0);
1122 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1123
1124 usb_unlock_device(dev);
1125 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1126 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1127 tbuf, ctrl.wLength, tmo);
1128 usb_lock_device(dev);
1129 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1130 tbuf, max(i, 0));
1131 if ((i > 0) && ctrl.wLength) {
1132 if (copy_to_user(ctrl.data, tbuf, i)) {
1133 ret = -EFAULT;
1134 goto done;
1135 }
1136 }
1137 } else {
1138 if (ctrl.wLength) {
1139 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1140 ret = -EFAULT;
1141 goto done;
1142 }
1143 }
1144 pipe = usb_sndctrlpipe(dev, 0);
1145 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1146 tbuf, ctrl.wLength);
1147
1148 usb_unlock_device(dev);
1149 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1150 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1151 tbuf, ctrl.wLength, tmo);
1152 usb_lock_device(dev);
1153 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1154 }
1155 if (i < 0 && i != -EPIPE) {
1156 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1157 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1158 current->comm, ctrl.bRequestType, ctrl.bRequest,
1159 ctrl.wLength, i);
1160 }
1161 ret = i;
1162 done:
1163 free_page((unsigned long) tbuf);
1164 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1165 sizeof(struct usb_ctrlrequest));
1166 return ret;
1167}
1168
1169static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1170{
1171 struct usb_device *dev = ps->dev;
1172 struct usbdevfs_bulktransfer bulk;
1173 unsigned int tmo, len1, pipe;
1174 int len2;
1175 unsigned char *tbuf;
1176 int i, ret;
1177
1178 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1179 return -EFAULT;
1180 ret = findintfep(ps->dev, bulk.ep);
1181 if (ret < 0)
1182 return ret;
1183 ret = checkintf(ps, ret);
1184 if (ret)
1185 return ret;
1186 if (bulk.ep & USB_DIR_IN)
1187 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1188 else
1189 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1190 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1191 return -EINVAL;
1192 len1 = bulk.len;
1193 if (len1 >= USBFS_XFER_MAX)
1194 return -EINVAL;
1195 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1196 if (ret)
1197 return ret;
1198 tbuf = kmalloc(len1, GFP_KERNEL);
1199 if (!tbuf) {
1200 ret = -ENOMEM;
1201 goto done;
1202 }
1203 tmo = bulk.timeout;
1204 if (bulk.ep & 0x80) {
1205 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1206 ret = -EINVAL;
1207 goto done;
1208 }
1209 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1210
1211 usb_unlock_device(dev);
1212 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1213 usb_lock_device(dev);
1214 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1215
1216 if (!i && len2) {
1217 if (copy_to_user(bulk.data, tbuf, len2)) {
1218 ret = -EFAULT;
1219 goto done;
1220 }
1221 }
1222 } else {
1223 if (len1) {
1224 if (copy_from_user(tbuf, bulk.data, len1)) {
1225 ret = -EFAULT;
1226 goto done;
1227 }
1228 }
1229 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1230
1231 usb_unlock_device(dev);
1232 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1233 usb_lock_device(dev);
1234 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1235 }
1236 ret = (i < 0 ? i : len2);
1237 done:
1238 kfree(tbuf);
1239 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1240 return ret;
1241}
1242
1243static void check_reset_of_active_ep(struct usb_device *udev,
1244 unsigned int epnum, char *ioctl_name)
1245{
1246 struct usb_host_endpoint **eps;
1247 struct usb_host_endpoint *ep;
1248
1249 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1250 ep = eps[epnum & 0x0f];
1251 if (ep && !list_empty(&ep->urb_list))
1252 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1253 task_pid_nr(current), current->comm,
1254 ioctl_name, epnum);
1255}
1256
1257static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1258{
1259 unsigned int ep;
1260 int ret;
1261
1262 if (get_user(ep, (unsigned int __user *)arg))
1263 return -EFAULT;
1264 ret = findintfep(ps->dev, ep);
1265 if (ret < 0)
1266 return ret;
1267 ret = checkintf(ps, ret);
1268 if (ret)
1269 return ret;
1270 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1271 usb_reset_endpoint(ps->dev, ep);
1272 return 0;
1273}
1274
1275static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1276{
1277 unsigned int ep;
1278 int pipe;
1279 int ret;
1280
1281 if (get_user(ep, (unsigned int __user *)arg))
1282 return -EFAULT;
1283 ret = findintfep(ps->dev, ep);
1284 if (ret < 0)
1285 return ret;
1286 ret = checkintf(ps, ret);
1287 if (ret)
1288 return ret;
1289 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1290 if (ep & USB_DIR_IN)
1291 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1292 else
1293 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1294
1295 return usb_clear_halt(ps->dev, pipe);
1296}
1297
1298static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1299{
1300 struct usbdevfs_getdriver gd;
1301 struct usb_interface *intf;
1302 int ret;
1303
1304 if (copy_from_user(&gd, arg, sizeof(gd)))
1305 return -EFAULT;
1306 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1307 if (!intf || !intf->dev.driver)
1308 ret = -ENODATA;
1309 else {
1310 strlcpy(gd.driver, intf->dev.driver->name,
1311 sizeof(gd.driver));
1312 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1313 }
1314 return ret;
1315}
1316
1317static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1318{
1319 struct usbdevfs_connectinfo ci = {
1320 .devnum = ps->dev->devnum,
1321 .slow = ps->dev->speed == USB_SPEED_LOW
1322 };
1323
1324 if (copy_to_user(arg, &ci, sizeof(ci)))
1325 return -EFAULT;
1326 return 0;
1327}
1328
1329static int proc_resetdevice(struct usb_dev_state *ps)
1330{
1331 struct usb_host_config *actconfig = ps->dev->actconfig;
1332 struct usb_interface *interface;
1333 int i, number;
1334
1335 /* Don't allow a device reset if the process has dropped the
1336 * privilege to do such things and any of the interfaces are
1337 * currently claimed.
1338 */
1339 if (ps->privileges_dropped && actconfig) {
1340 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1341 interface = actconfig->interface[i];
1342 number = interface->cur_altsetting->desc.bInterfaceNumber;
1343 if (usb_interface_claimed(interface) &&
1344 !test_bit(number, &ps->ifclaimed)) {
1345 dev_warn(&ps->dev->dev,
1346 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1347 number, interface->dev.driver->name, current->comm);
1348 return -EACCES;
1349 }
1350 }
1351 }
1352
1353 return usb_reset_device(ps->dev);
1354}
1355
1356static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1357{
1358 struct usbdevfs_setinterface setintf;
1359 int ret;
1360
1361 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1362 return -EFAULT;
1363 ret = checkintf(ps, setintf.interface);
1364 if (ret)
1365 return ret;
1366
1367 destroy_async_on_interface(ps, setintf.interface);
1368
1369 return usb_set_interface(ps->dev, setintf.interface,
1370 setintf.altsetting);
1371}
1372
1373static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1374{
1375 int u;
1376 int status = 0;
1377 struct usb_host_config *actconfig;
1378
1379 if (get_user(u, (int __user *)arg))
1380 return -EFAULT;
1381
1382 actconfig = ps->dev->actconfig;
1383
1384 /* Don't touch the device if any interfaces are claimed.
1385 * It could interfere with other drivers' operations, and if
1386 * an interface is claimed by usbfs it could easily deadlock.
1387 */
1388 if (actconfig) {
1389 int i;
1390
1391 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1392 if (usb_interface_claimed(actconfig->interface[i])) {
1393 dev_warn(&ps->dev->dev,
1394 "usbfs: interface %d claimed by %s "
1395 "while '%s' sets config #%d\n",
1396 actconfig->interface[i]
1397 ->cur_altsetting
1398 ->desc.bInterfaceNumber,
1399 actconfig->interface[i]
1400 ->dev.driver->name,
1401 current->comm, u);
1402 status = -EBUSY;
1403 break;
1404 }
1405 }
1406 }
1407
1408 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1409 * so avoid usb_set_configuration()'s kick to sysfs
1410 */
1411 if (status == 0) {
1412 if (actconfig && actconfig->desc.bConfigurationValue == u)
1413 status = usb_reset_configuration(ps->dev);
1414 else
1415 status = usb_set_configuration(ps->dev, u);
1416 }
1417
1418 return status;
1419}
1420
1421static struct usb_memory *
1422find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1423{
1424 struct usb_memory *usbm = NULL, *iter;
1425 unsigned long flags;
1426 unsigned long uurb_start = (unsigned long)uurb->buffer;
1427
1428 spin_lock_irqsave(&ps->lock, flags);
1429 list_for_each_entry(iter, &ps->memory_list, memlist) {
1430 if (uurb_start >= iter->vm_start &&
1431 uurb_start < iter->vm_start + iter->size) {
1432 if (uurb->buffer_length > iter->vm_start + iter->size -
1433 uurb_start) {
1434 usbm = ERR_PTR(-EINVAL);
1435 } else {
1436 usbm = iter;
1437 usbm->urb_use_count++;
1438 }
1439 break;
1440 }
1441 }
1442 spin_unlock_irqrestore(&ps->lock, flags);
1443 return usbm;
1444}
1445
1446static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1447 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1448 void __user *arg)
1449{
1450 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1451 struct usb_host_endpoint *ep;
1452 struct async *as = NULL;
1453 struct usb_ctrlrequest *dr = NULL;
1454 unsigned int u, totlen, isofrmlen;
1455 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1456 int number_of_packets = 0;
1457 unsigned int stream_id = 0;
1458 void *buf;
1459
1460 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1461 USBDEVFS_URB_SHORT_NOT_OK |
1462 USBDEVFS_URB_BULK_CONTINUATION |
1463 USBDEVFS_URB_NO_FSBR |
1464 USBDEVFS_URB_ZERO_PACKET |
1465 USBDEVFS_URB_NO_INTERRUPT))
1466 return -EINVAL;
1467 if (uurb->buffer_length > 0 && !uurb->buffer)
1468 return -EINVAL;
1469 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1470 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1471 ifnum = findintfep(ps->dev, uurb->endpoint);
1472 if (ifnum < 0)
1473 return ifnum;
1474 ret = checkintf(ps, ifnum);
1475 if (ret)
1476 return ret;
1477 }
1478 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1479 if (!ep)
1480 return -ENOENT;
1481 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1482
1483 u = 0;
1484 switch (uurb->type) {
1485 case USBDEVFS_URB_TYPE_CONTROL:
1486 if (!usb_endpoint_xfer_control(&ep->desc))
1487 return -EINVAL;
1488 /* min 8 byte setup packet */
1489 if (uurb->buffer_length < 8)
1490 return -EINVAL;
1491 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1492 if (!dr)
1493 return -ENOMEM;
1494 if (copy_from_user(dr, uurb->buffer, 8)) {
1495 ret = -EFAULT;
1496 goto error;
1497 }
1498 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1499 ret = -EINVAL;
1500 goto error;
1501 }
1502 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1503 le16_to_cpup(&dr->wIndex));
1504 if (ret)
1505 goto error;
1506 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1507 uurb->buffer += 8;
1508 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1509 is_in = 1;
1510 uurb->endpoint |= USB_DIR_IN;
1511 } else {
1512 is_in = 0;
1513 uurb->endpoint &= ~USB_DIR_IN;
1514 }
1515 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1516 "bRequest=%02x wValue=%04x "
1517 "wIndex=%04x wLength=%04x\n",
1518 dr->bRequestType, dr->bRequest,
1519 __le16_to_cpup(&dr->wValue),
1520 __le16_to_cpup(&dr->wIndex),
1521 __le16_to_cpup(&dr->wLength));
1522 u = sizeof(struct usb_ctrlrequest);
1523 break;
1524
1525 case USBDEVFS_URB_TYPE_BULK:
1526 switch (usb_endpoint_type(&ep->desc)) {
1527 case USB_ENDPOINT_XFER_CONTROL:
1528 case USB_ENDPOINT_XFER_ISOC:
1529 return -EINVAL;
1530 case USB_ENDPOINT_XFER_INT:
1531 /* allow single-shot interrupt transfers */
1532 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1533 goto interrupt_urb;
1534 }
1535 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1536 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1537 num_sgs = 0;
1538 if (ep->streams)
1539 stream_id = uurb->stream_id;
1540 break;
1541
1542 case USBDEVFS_URB_TYPE_INTERRUPT:
1543 if (!usb_endpoint_xfer_int(&ep->desc))
1544 return -EINVAL;
1545 interrupt_urb:
1546 break;
1547
1548 case USBDEVFS_URB_TYPE_ISO:
1549 /* arbitrary limit */
1550 if (uurb->number_of_packets < 1 ||
1551 uurb->number_of_packets > 128)
1552 return -EINVAL;
1553 if (!usb_endpoint_xfer_isoc(&ep->desc))
1554 return -EINVAL;
1555 number_of_packets = uurb->number_of_packets;
1556 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1557 number_of_packets;
1558 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1559 if (IS_ERR(isopkt)) {
1560 ret = PTR_ERR(isopkt);
1561 isopkt = NULL;
1562 goto error;
1563 }
1564 for (totlen = u = 0; u < number_of_packets; u++) {
1565 /*
1566 * arbitrary limit need for USB 3.0
1567 * bMaxBurst (0~15 allowed, 1~16 packets)
1568 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1569 * sizemax: 1024 * 16 * 3 = 49152
1570 */
1571 if (isopkt[u].length > 49152) {
1572 ret = -EINVAL;
1573 goto error;
1574 }
1575 totlen += isopkt[u].length;
1576 }
1577 u *= sizeof(struct usb_iso_packet_descriptor);
1578 uurb->buffer_length = totlen;
1579 break;
1580
1581 default:
1582 return -EINVAL;
1583 }
1584
1585 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1586 ret = -EINVAL;
1587 goto error;
1588 }
1589 if (uurb->buffer_length > 0 &&
1590 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1591 uurb->buffer, uurb->buffer_length)) {
1592 ret = -EFAULT;
1593 goto error;
1594 }
1595 as = alloc_async(number_of_packets);
1596 if (!as) {
1597 ret = -ENOMEM;
1598 goto error;
1599 }
1600
1601 as->usbm = find_memory_area(ps, uurb);
1602 if (IS_ERR(as->usbm)) {
1603 ret = PTR_ERR(as->usbm);
1604 as->usbm = NULL;
1605 goto error;
1606 }
1607
1608 /* do not use SG buffers when memory mapped segments
1609 * are in use
1610 */
1611 if (as->usbm)
1612 num_sgs = 0;
1613
1614 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1615 num_sgs * sizeof(struct scatterlist);
1616 ret = usbfs_increase_memory_usage(u);
1617 if (ret)
1618 goto error;
1619 as->mem_usage = u;
1620
1621 if (num_sgs) {
1622 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1623 GFP_KERNEL);
1624 if (!as->urb->sg) {
1625 ret = -ENOMEM;
1626 goto error;
1627 }
1628 as->urb->num_sgs = num_sgs;
1629 sg_init_table(as->urb->sg, as->urb->num_sgs);
1630
1631 totlen = uurb->buffer_length;
1632 for (i = 0; i < as->urb->num_sgs; i++) {
1633 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1634 buf = kmalloc(u, GFP_KERNEL);
1635 if (!buf) {
1636 ret = -ENOMEM;
1637 goto error;
1638 }
1639 sg_set_buf(&as->urb->sg[i], buf, u);
1640
1641 if (!is_in) {
1642 if (copy_from_user(buf, uurb->buffer, u)) {
1643 ret = -EFAULT;
1644 goto error;
1645 }
1646 uurb->buffer += u;
1647 }
1648 totlen -= u;
1649 }
1650 } else if (uurb->buffer_length > 0) {
1651 if (as->usbm) {
1652 unsigned long uurb_start = (unsigned long)uurb->buffer;
1653
1654 as->urb->transfer_buffer = as->usbm->mem +
1655 (uurb_start - as->usbm->vm_start);
1656 } else {
1657 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1658 GFP_KERNEL);
1659 if (!as->urb->transfer_buffer) {
1660 ret = -ENOMEM;
1661 goto error;
1662 }
1663 if (!is_in) {
1664 if (copy_from_user(as->urb->transfer_buffer,
1665 uurb->buffer,
1666 uurb->buffer_length)) {
1667 ret = -EFAULT;
1668 goto error;
1669 }
1670 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1671 /*
1672 * Isochronous input data may end up being
1673 * discontiguous if some of the packets are
1674 * short. Clear the buffer so that the gaps
1675 * don't leak kernel data to userspace.
1676 */
1677 memset(as->urb->transfer_buffer, 0,
1678 uurb->buffer_length);
1679 }
1680 }
1681 }
1682 as->urb->dev = ps->dev;
1683 as->urb->pipe = (uurb->type << 30) |
1684 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1685 (uurb->endpoint & USB_DIR_IN);
1686
1687 /* This tedious sequence is necessary because the URB_* flags
1688 * are internal to the kernel and subject to change, whereas
1689 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1690 */
1691 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1692 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1693 u |= URB_ISO_ASAP;
1694 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1695 u |= URB_SHORT_NOT_OK;
1696 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1697 u |= URB_NO_FSBR;
1698 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1699 u |= URB_ZERO_PACKET;
1700 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1701 u |= URB_NO_INTERRUPT;
1702 as->urb->transfer_flags = u;
1703
1704 as->urb->transfer_buffer_length = uurb->buffer_length;
1705 as->urb->setup_packet = (unsigned char *)dr;
1706 dr = NULL;
1707 as->urb->start_frame = uurb->start_frame;
1708 as->urb->number_of_packets = number_of_packets;
1709 as->urb->stream_id = stream_id;
1710 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1711 ps->dev->speed == USB_SPEED_HIGH)
1712 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1713 else
1714 as->urb->interval = ep->desc.bInterval;
1715 as->urb->context = as;
1716 as->urb->complete = async_completed;
1717 for (totlen = u = 0; u < number_of_packets; u++) {
1718 as->urb->iso_frame_desc[u].offset = totlen;
1719 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1720 totlen += isopkt[u].length;
1721 }
1722 kfree(isopkt);
1723 isopkt = NULL;
1724 as->ps = ps;
1725 as->userurb = arg;
1726 if (as->usbm) {
1727 unsigned long uurb_start = (unsigned long)uurb->buffer;
1728
1729 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1730 as->urb->transfer_dma = as->usbm->dma_handle +
1731 (uurb_start - as->usbm->vm_start);
1732 } else if (is_in && uurb->buffer_length > 0)
1733 as->userbuffer = uurb->buffer;
1734 as->signr = uurb->signr;
1735 as->ifnum = ifnum;
1736 as->pid = get_pid(task_pid(current));
1737 as->cred = get_current_cred();
1738 security_task_getsecid(current, &as->secid);
1739 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1740 as->urb->transfer_buffer_length, 0, SUBMIT,
1741 NULL, 0);
1742 if (!is_in)
1743 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1744
1745 async_newpending(as);
1746
1747 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1748 spin_lock_irq(&ps->lock);
1749
1750 /* Not exactly the endpoint address; the direction bit is
1751 * shifted to the 0x10 position so that the value will be
1752 * between 0 and 31.
1753 */
1754 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1755 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1756 >> 3);
1757
1758 /* If this bulk URB is the start of a new transfer, re-enable
1759 * the endpoint. Otherwise mark it as a continuation URB.
1760 */
1761 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1762 as->bulk_status = AS_CONTINUATION;
1763 else
1764 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1765
1766 /* Don't accept continuation URBs if the endpoint is
1767 * disabled because of an earlier error.
1768 */
1769 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1770 ret = -EREMOTEIO;
1771 else
1772 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1773 spin_unlock_irq(&ps->lock);
1774 } else {
1775 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1776 }
1777
1778 if (ret) {
1779 dev_printk(KERN_DEBUG, &ps->dev->dev,
1780 "usbfs: usb_submit_urb returned %d\n", ret);
1781 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1782 0, ret, COMPLETE, NULL, 0);
1783 async_removepending(as);
1784 goto error;
1785 }
1786 return 0;
1787
1788 error:
1789 if (as && as->usbm)
1790 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1791 kfree(isopkt);
1792 kfree(dr);
1793 if (as)
1794 free_async(as);
1795 return ret;
1796}
1797
1798static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1799{
1800 struct usbdevfs_urb uurb;
1801
1802 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1803 return -EFAULT;
1804
1805 return proc_do_submiturb(ps, &uurb,
1806 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1807 arg);
1808}
1809
1810static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1811{
1812 struct urb *urb;
1813 struct async *as;
1814 unsigned long flags;
1815
1816 spin_lock_irqsave(&ps->lock, flags);
1817 as = async_getpending(ps, arg);
1818 if (!as) {
1819 spin_unlock_irqrestore(&ps->lock, flags);
1820 return -EINVAL;
1821 }
1822
1823 urb = as->urb;
1824 usb_get_urb(urb);
1825 spin_unlock_irqrestore(&ps->lock, flags);
1826
1827 usb_kill_urb(urb);
1828 usb_put_urb(urb);
1829
1830 return 0;
1831}
1832
1833static int processcompl(struct async *as, void __user * __user *arg)
1834{
1835 struct urb *urb = as->urb;
1836 struct usbdevfs_urb __user *userurb = as->userurb;
1837 void __user *addr = as->userurb;
1838 unsigned int i;
1839
1840 if (as->userbuffer && urb->actual_length) {
1841 if (copy_urb_data_to_user(as->userbuffer, urb))
1842 goto err_out;
1843 }
1844 if (put_user(as->status, &userurb->status))
1845 goto err_out;
1846 if (put_user(urb->actual_length, &userurb->actual_length))
1847 goto err_out;
1848 if (put_user(urb->error_count, &userurb->error_count))
1849 goto err_out;
1850
1851 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1852 for (i = 0; i < urb->number_of_packets; i++) {
1853 if (put_user(urb->iso_frame_desc[i].actual_length,
1854 &userurb->iso_frame_desc[i].actual_length))
1855 goto err_out;
1856 if (put_user(urb->iso_frame_desc[i].status,
1857 &userurb->iso_frame_desc[i].status))
1858 goto err_out;
1859 }
1860 }
1861
1862 if (put_user(addr, (void __user * __user *)arg))
1863 return -EFAULT;
1864 return 0;
1865
1866err_out:
1867 return -EFAULT;
1868}
1869
1870static struct async *reap_as(struct usb_dev_state *ps)
1871{
1872 DECLARE_WAITQUEUE(wait, current);
1873 struct async *as = NULL;
1874 struct usb_device *dev = ps->dev;
1875
1876 add_wait_queue(&ps->wait, &wait);
1877 for (;;) {
1878 __set_current_state(TASK_INTERRUPTIBLE);
1879 as = async_getcompleted(ps);
1880 if (as || !connected(ps))
1881 break;
1882 if (signal_pending(current))
1883 break;
1884 usb_unlock_device(dev);
1885 schedule();
1886 usb_lock_device(dev);
1887 }
1888 remove_wait_queue(&ps->wait, &wait);
1889 set_current_state(TASK_RUNNING);
1890 return as;
1891}
1892
1893static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1894{
1895 struct async *as = reap_as(ps);
1896
1897 if (as) {
1898 int retval;
1899
1900 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1901 retval = processcompl(as, (void __user * __user *)arg);
1902 free_async(as);
1903 return retval;
1904 }
1905 if (signal_pending(current))
1906 return -EINTR;
1907 return -ENODEV;
1908}
1909
1910static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1911{
1912 int retval;
1913 struct async *as;
1914
1915 as = async_getcompleted(ps);
1916 if (as) {
1917 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1918 retval = processcompl(as, (void __user * __user *)arg);
1919 free_async(as);
1920 } else {
1921 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1922 }
1923 return retval;
1924}
1925
1926#ifdef CONFIG_COMPAT
1927static int proc_control_compat(struct usb_dev_state *ps,
1928 struct usbdevfs_ctrltransfer32 __user *p32)
1929{
1930 struct usbdevfs_ctrltransfer __user *p;
1931 __u32 udata;
1932 p = compat_alloc_user_space(sizeof(*p));
1933 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1934 get_user(udata, &p32->data) ||
1935 put_user(compat_ptr(udata), &p->data))
1936 return -EFAULT;
1937 return proc_control(ps, p);
1938}
1939
1940static int proc_bulk_compat(struct usb_dev_state *ps,
1941 struct usbdevfs_bulktransfer32 __user *p32)
1942{
1943 struct usbdevfs_bulktransfer __user *p;
1944 compat_uint_t n;
1945 compat_caddr_t addr;
1946
1947 p = compat_alloc_user_space(sizeof(*p));
1948
1949 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1950 get_user(n, &p32->len) || put_user(n, &p->len) ||
1951 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1952 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1953 return -EFAULT;
1954
1955 return proc_bulk(ps, p);
1956}
1957static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1958{
1959 struct usbdevfs_disconnectsignal32 ds;
1960
1961 if (copy_from_user(&ds, arg, sizeof(ds)))
1962 return -EFAULT;
1963 ps->discsignr = ds.signr;
1964 ps->disccontext = compat_ptr(ds.context);
1965 return 0;
1966}
1967
1968static int get_urb32(struct usbdevfs_urb *kurb,
1969 struct usbdevfs_urb32 __user *uurb)
1970{
1971 __u32 uptr;
1972 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1973 __get_user(kurb->type, &uurb->type) ||
1974 __get_user(kurb->endpoint, &uurb->endpoint) ||
1975 __get_user(kurb->status, &uurb->status) ||
1976 __get_user(kurb->flags, &uurb->flags) ||
1977 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1978 __get_user(kurb->actual_length, &uurb->actual_length) ||
1979 __get_user(kurb->start_frame, &uurb->start_frame) ||
1980 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1981 __get_user(kurb->error_count, &uurb->error_count) ||
1982 __get_user(kurb->signr, &uurb->signr))
1983 return -EFAULT;
1984
1985 if (__get_user(uptr, &uurb->buffer))
1986 return -EFAULT;
1987 kurb->buffer = compat_ptr(uptr);
1988 if (__get_user(uptr, &uurb->usercontext))
1989 return -EFAULT;
1990 kurb->usercontext = compat_ptr(uptr);
1991
1992 return 0;
1993}
1994
1995static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1996{
1997 struct usbdevfs_urb uurb;
1998
1999 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2000 return -EFAULT;
2001
2002 return proc_do_submiturb(ps, &uurb,
2003 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2004 arg);
2005}
2006
2007static int processcompl_compat(struct async *as, void __user * __user *arg)
2008{
2009 struct urb *urb = as->urb;
2010 struct usbdevfs_urb32 __user *userurb = as->userurb;
2011 void __user *addr = as->userurb;
2012 unsigned int i;
2013
2014 if (as->userbuffer && urb->actual_length) {
2015 if (copy_urb_data_to_user(as->userbuffer, urb))
2016 return -EFAULT;
2017 }
2018 if (put_user(as->status, &userurb->status))
2019 return -EFAULT;
2020 if (put_user(urb->actual_length, &userurb->actual_length))
2021 return -EFAULT;
2022 if (put_user(urb->error_count, &userurb->error_count))
2023 return -EFAULT;
2024
2025 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2026 for (i = 0; i < urb->number_of_packets; i++) {
2027 if (put_user(urb->iso_frame_desc[i].actual_length,
2028 &userurb->iso_frame_desc[i].actual_length))
2029 return -EFAULT;
2030 if (put_user(urb->iso_frame_desc[i].status,
2031 &userurb->iso_frame_desc[i].status))
2032 return -EFAULT;
2033 }
2034 }
2035
2036 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2037 return -EFAULT;
2038 return 0;
2039}
2040
2041static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2042{
2043 struct async *as = reap_as(ps);
2044
2045 if (as) {
2046 int retval;
2047
2048 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2049 retval = processcompl_compat(as, (void __user * __user *)arg);
2050 free_async(as);
2051 return retval;
2052 }
2053 if (signal_pending(current))
2054 return -EINTR;
2055 return -ENODEV;
2056}
2057
2058static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2059{
2060 int retval;
2061 struct async *as;
2062
2063 as = async_getcompleted(ps);
2064 if (as) {
2065 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2066 retval = processcompl_compat(as, (void __user * __user *)arg);
2067 free_async(as);
2068 } else {
2069 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2070 }
2071 return retval;
2072}
2073
2074
2075#endif
2076
2077static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2078{
2079 struct usbdevfs_disconnectsignal ds;
2080
2081 if (copy_from_user(&ds, arg, sizeof(ds)))
2082 return -EFAULT;
2083 ps->discsignr = ds.signr;
2084 ps->disccontext = ds.context;
2085 return 0;
2086}
2087
2088static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2089{
2090 unsigned int ifnum;
2091
2092 if (get_user(ifnum, (unsigned int __user *)arg))
2093 return -EFAULT;
2094 return claimintf(ps, ifnum);
2095}
2096
2097static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2098{
2099 unsigned int ifnum;
2100 int ret;
2101
2102 if (get_user(ifnum, (unsigned int __user *)arg))
2103 return -EFAULT;
2104 ret = releaseintf(ps, ifnum);
2105 if (ret < 0)
2106 return ret;
2107 destroy_async_on_interface(ps, ifnum);
2108 return 0;
2109}
2110
2111static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2112{
2113 int size;
2114 void *buf = NULL;
2115 int retval = 0;
2116 struct usb_interface *intf = NULL;
2117 struct usb_driver *driver = NULL;
2118
2119 if (ps->privileges_dropped)
2120 return -EACCES;
2121
2122 /* alloc buffer */
2123 size = _IOC_SIZE(ctl->ioctl_code);
2124 if (size > 0) {
2125 buf = kmalloc(size, GFP_KERNEL);
2126 if (buf == NULL)
2127 return -ENOMEM;
2128 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2129 if (copy_from_user(buf, ctl->data, size)) {
2130 kfree(buf);
2131 return -EFAULT;
2132 }
2133 } else {
2134 memset(buf, 0, size);
2135 }
2136 }
2137
2138 if (!connected(ps)) {
2139 kfree(buf);
2140 return -ENODEV;
2141 }
2142
2143 if (ps->dev->state != USB_STATE_CONFIGURED)
2144 retval = -EHOSTUNREACH;
2145 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2146 retval = -EINVAL;
2147 else switch (ctl->ioctl_code) {
2148
2149 /* disconnect kernel driver from interface */
2150 case USBDEVFS_DISCONNECT:
2151 if (intf->dev.driver) {
2152 driver = to_usb_driver(intf->dev.driver);
2153 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2154 usb_driver_release_interface(driver, intf);
2155 } else
2156 retval = -ENODATA;
2157 break;
2158
2159 /* let kernel drivers try to (re)bind to the interface */
2160 case USBDEVFS_CONNECT:
2161 if (!intf->dev.driver)
2162 retval = device_attach(&intf->dev);
2163 else
2164 retval = -EBUSY;
2165 break;
2166
2167 /* talk directly to the interface's driver */
2168 default:
2169 if (intf->dev.driver)
2170 driver = to_usb_driver(intf->dev.driver);
2171 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2172 retval = -ENOTTY;
2173 } else {
2174 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2175 if (retval == -ENOIOCTLCMD)
2176 retval = -ENOTTY;
2177 }
2178 }
2179
2180 /* cleanup and return */
2181 if (retval >= 0
2182 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2183 && size > 0
2184 && copy_to_user(ctl->data, buf, size) != 0)
2185 retval = -EFAULT;
2186
2187 kfree(buf);
2188 return retval;
2189}
2190
2191static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2192{
2193 struct usbdevfs_ioctl ctrl;
2194
2195 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2196 return -EFAULT;
2197 return proc_ioctl(ps, &ctrl);
2198}
2199
2200#ifdef CONFIG_COMPAT
2201static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2202{
2203 struct usbdevfs_ioctl32 __user *uioc;
2204 struct usbdevfs_ioctl ctrl;
2205 u32 udata;
2206
2207 uioc = compat_ptr((long)arg);
2208 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2209 __get_user(ctrl.ifno, &uioc->ifno) ||
2210 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2211 __get_user(udata, &uioc->data))
2212 return -EFAULT;
2213 ctrl.data = compat_ptr(udata);
2214
2215 return proc_ioctl(ps, &ctrl);
2216}
2217#endif
2218
2219static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2220{
2221 unsigned portnum;
2222 int rc;
2223
2224 if (get_user(portnum, (unsigned __user *) arg))
2225 return -EFAULT;
2226 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2227 if (rc == 0)
2228 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2229 portnum, task_pid_nr(current), current->comm);
2230 return rc;
2231}
2232
2233static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2234{
2235 unsigned portnum;
2236
2237 if (get_user(portnum, (unsigned __user *) arg))
2238 return -EFAULT;
2239 return usb_hub_release_port(ps->dev, portnum, ps);
2240}
2241
2242static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2243{
2244 __u32 caps;
2245
2246 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2247 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2248 USBDEVFS_CAP_DROP_PRIVILEGES;
2249 if (!ps->dev->bus->no_stop_on_short)
2250 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2251 if (ps->dev->bus->sg_tablesize)
2252 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2253
2254 if (put_user(caps, (__u32 __user *)arg))
2255 return -EFAULT;
2256
2257 return 0;
2258}
2259
2260static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2261{
2262 struct usbdevfs_disconnect_claim dc;
2263 struct usb_interface *intf;
2264
2265 if (copy_from_user(&dc, arg, sizeof(dc)))
2266 return -EFAULT;
2267
2268 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2269 if (!intf)
2270 return -EINVAL;
2271
2272 if (intf->dev.driver) {
2273 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2274
2275 if (ps->privileges_dropped)
2276 return -EACCES;
2277
2278 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2279 strncmp(dc.driver, intf->dev.driver->name,
2280 sizeof(dc.driver)) != 0)
2281 return -EBUSY;
2282
2283 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2284 strncmp(dc.driver, intf->dev.driver->name,
2285 sizeof(dc.driver)) == 0)
2286 return -EBUSY;
2287
2288 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2289 usb_driver_release_interface(driver, intf);
2290 }
2291
2292 return claimintf(ps, dc.interface);
2293}
2294
2295static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2296{
2297 unsigned num_streams, num_eps;
2298 struct usb_host_endpoint **eps;
2299 struct usb_interface *intf;
2300 int r;
2301
2302 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2303 &eps, &intf);
2304 if (r)
2305 return r;
2306
2307 destroy_async_on_interface(ps,
2308 intf->altsetting[0].desc.bInterfaceNumber);
2309
2310 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2311 kfree(eps);
2312 return r;
2313}
2314
2315static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2316{
2317 unsigned num_eps;
2318 struct usb_host_endpoint **eps;
2319 struct usb_interface *intf;
2320 int r;
2321
2322 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2323 if (r)
2324 return r;
2325
2326 destroy_async_on_interface(ps,
2327 intf->altsetting[0].desc.bInterfaceNumber);
2328
2329 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2330 kfree(eps);
2331 return r;
2332}
2333
2334static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2335{
2336 u32 data;
2337
2338 if (copy_from_user(&data, arg, sizeof(data)))
2339 return -EFAULT;
2340
2341 /* This is an one way operation. Once privileges are
2342 * dropped, you cannot regain them. You may however reissue
2343 * this ioctl to shrink the allowed interfaces mask.
2344 */
2345 ps->interface_allowed_mask &= data;
2346 ps->privileges_dropped = true;
2347
2348 return 0;
2349}
2350
2351/*
2352 * NOTE: All requests here that have interface numbers as parameters
2353 * are assuming that somehow the configuration has been prevented from
2354 * changing. But there's no mechanism to ensure that...
2355 */
2356static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2357 void __user *p)
2358{
2359 struct usb_dev_state *ps = file->private_data;
2360 struct inode *inode = file_inode(file);
2361 struct usb_device *dev = ps->dev;
2362 int ret = -ENOTTY;
2363
2364 if (!(file->f_mode & FMODE_WRITE))
2365 return -EPERM;
2366
2367 usb_lock_device(dev);
2368
2369 /* Reap operations are allowed even after disconnection */
2370 switch (cmd) {
2371 case USBDEVFS_REAPURB:
2372 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2373 ret = proc_reapurb(ps, p);
2374 goto done;
2375
2376 case USBDEVFS_REAPURBNDELAY:
2377 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2378 ret = proc_reapurbnonblock(ps, p);
2379 goto done;
2380
2381#ifdef CONFIG_COMPAT
2382 case USBDEVFS_REAPURB32:
2383 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2384 ret = proc_reapurb_compat(ps, p);
2385 goto done;
2386
2387 case USBDEVFS_REAPURBNDELAY32:
2388 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2389 ret = proc_reapurbnonblock_compat(ps, p);
2390 goto done;
2391#endif
2392 }
2393
2394 if (!connected(ps)) {
2395 usb_unlock_device(dev);
2396 return -ENODEV;
2397 }
2398
2399 switch (cmd) {
2400 case USBDEVFS_CONTROL:
2401 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2402 ret = proc_control(ps, p);
2403 if (ret >= 0)
2404 inode->i_mtime = CURRENT_TIME;
2405 break;
2406
2407 case USBDEVFS_BULK:
2408 snoop(&dev->dev, "%s: BULK\n", __func__);
2409 ret = proc_bulk(ps, p);
2410 if (ret >= 0)
2411 inode->i_mtime = CURRENT_TIME;
2412 break;
2413
2414 case USBDEVFS_RESETEP:
2415 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2416 ret = proc_resetep(ps, p);
2417 if (ret >= 0)
2418 inode->i_mtime = CURRENT_TIME;
2419 break;
2420
2421 case USBDEVFS_RESET:
2422 snoop(&dev->dev, "%s: RESET\n", __func__);
2423 ret = proc_resetdevice(ps);
2424 break;
2425
2426 case USBDEVFS_CLEAR_HALT:
2427 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2428 ret = proc_clearhalt(ps, p);
2429 if (ret >= 0)
2430 inode->i_mtime = CURRENT_TIME;
2431 break;
2432
2433 case USBDEVFS_GETDRIVER:
2434 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2435 ret = proc_getdriver(ps, p);
2436 break;
2437
2438 case USBDEVFS_CONNECTINFO:
2439 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2440 ret = proc_connectinfo(ps, p);
2441 break;
2442
2443 case USBDEVFS_SETINTERFACE:
2444 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2445 ret = proc_setintf(ps, p);
2446 break;
2447
2448 case USBDEVFS_SETCONFIGURATION:
2449 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2450 ret = proc_setconfig(ps, p);
2451 break;
2452
2453 case USBDEVFS_SUBMITURB:
2454 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2455 ret = proc_submiturb(ps, p);
2456 if (ret >= 0)
2457 inode->i_mtime = CURRENT_TIME;
2458 break;
2459
2460#ifdef CONFIG_COMPAT
2461 case USBDEVFS_CONTROL32:
2462 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2463 ret = proc_control_compat(ps, p);
2464 if (ret >= 0)
2465 inode->i_mtime = CURRENT_TIME;
2466 break;
2467
2468 case USBDEVFS_BULK32:
2469 snoop(&dev->dev, "%s: BULK32\n", __func__);
2470 ret = proc_bulk_compat(ps, p);
2471 if (ret >= 0)
2472 inode->i_mtime = CURRENT_TIME;
2473 break;
2474
2475 case USBDEVFS_DISCSIGNAL32:
2476 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2477 ret = proc_disconnectsignal_compat(ps, p);
2478 break;
2479
2480 case USBDEVFS_SUBMITURB32:
2481 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2482 ret = proc_submiturb_compat(ps, p);
2483 if (ret >= 0)
2484 inode->i_mtime = CURRENT_TIME;
2485 break;
2486
2487 case USBDEVFS_IOCTL32:
2488 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2489 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2490 break;
2491#endif
2492
2493 case USBDEVFS_DISCARDURB:
2494 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2495 ret = proc_unlinkurb(ps, p);
2496 break;
2497
2498 case USBDEVFS_DISCSIGNAL:
2499 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2500 ret = proc_disconnectsignal(ps, p);
2501 break;
2502
2503 case USBDEVFS_CLAIMINTERFACE:
2504 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2505 ret = proc_claiminterface(ps, p);
2506 break;
2507
2508 case USBDEVFS_RELEASEINTERFACE:
2509 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2510 ret = proc_releaseinterface(ps, p);
2511 break;
2512
2513 case USBDEVFS_IOCTL:
2514 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2515 ret = proc_ioctl_default(ps, p);
2516 break;
2517
2518 case USBDEVFS_CLAIM_PORT:
2519 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2520 ret = proc_claim_port(ps, p);
2521 break;
2522
2523 case USBDEVFS_RELEASE_PORT:
2524 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2525 ret = proc_release_port(ps, p);
2526 break;
2527 case USBDEVFS_GET_CAPABILITIES:
2528 ret = proc_get_capabilities(ps, p);
2529 break;
2530 case USBDEVFS_DISCONNECT_CLAIM:
2531 ret = proc_disconnect_claim(ps, p);
2532 break;
2533 case USBDEVFS_ALLOC_STREAMS:
2534 ret = proc_alloc_streams(ps, p);
2535 break;
2536 case USBDEVFS_FREE_STREAMS:
2537 ret = proc_free_streams(ps, p);
2538 break;
2539 case USBDEVFS_DROP_PRIVILEGES:
2540 ret = proc_drop_privileges(ps, p);
2541 break;
2542 }
2543
2544 done:
2545 usb_unlock_device(dev);
2546 if (ret >= 0)
2547 inode->i_atime = CURRENT_TIME;
2548 return ret;
2549}
2550
2551static long usbdev_ioctl(struct file *file, unsigned int cmd,
2552 unsigned long arg)
2553{
2554 int ret;
2555
2556 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2557
2558 return ret;
2559}
2560
2561#ifdef CONFIG_COMPAT
2562static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2563 unsigned long arg)
2564{
2565 int ret;
2566
2567 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2568
2569 return ret;
2570}
2571#endif
2572
2573/* No kernel lock - fine */
2574static unsigned int usbdev_poll(struct file *file,
2575 struct poll_table_struct *wait)
2576{
2577 struct usb_dev_state *ps = file->private_data;
2578 unsigned int mask = 0;
2579
2580 poll_wait(file, &ps->wait, wait);
2581 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2582 mask |= POLLOUT | POLLWRNORM;
2583 if (!connected(ps))
2584 mask |= POLLERR | POLLHUP;
2585 return mask;
2586}
2587
2588const struct file_operations usbdev_file_operations = {
2589 .owner = THIS_MODULE,
2590 .llseek = no_seek_end_llseek,
2591 .read = usbdev_read,
2592 .poll = usbdev_poll,
2593 .unlocked_ioctl = usbdev_ioctl,
2594#ifdef CONFIG_COMPAT
2595 .compat_ioctl = usbdev_compat_ioctl,
2596#endif
2597 .mmap = usbdev_mmap,
2598 .open = usbdev_open,
2599 .release = usbdev_release,
2600};
2601
2602static void usbdev_remove(struct usb_device *udev)
2603{
2604 struct usb_dev_state *ps;
2605 struct siginfo sinfo;
2606
2607 while (!list_empty(&udev->filelist)) {
2608 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2609 destroy_all_async(ps);
2610 wake_up_all(&ps->wait);
2611 list_del_init(&ps->list);
2612 if (ps->discsignr) {
2613 memset(&sinfo, 0, sizeof(sinfo));
2614 sinfo.si_signo = ps->discsignr;
2615 sinfo.si_errno = EPIPE;
2616 sinfo.si_code = SI_ASYNCIO;
2617 sinfo.si_addr = ps->disccontext;
2618 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2619 ps->disc_pid, ps->cred, ps->secid);
2620 }
2621 }
2622}
2623
2624static int usbdev_notify(struct notifier_block *self,
2625 unsigned long action, void *dev)
2626{
2627 switch (action) {
2628 case USB_DEVICE_ADD:
2629 break;
2630 case USB_DEVICE_REMOVE:
2631 usbdev_remove(dev);
2632 break;
2633 }
2634 return NOTIFY_OK;
2635}
2636
2637static struct notifier_block usbdev_nb = {
2638 .notifier_call = usbdev_notify,
2639};
2640
2641static struct cdev usb_device_cdev;
2642
2643int __init usb_devio_init(void)
2644{
2645 int retval;
2646
2647 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2648 "usb_device");
2649 if (retval) {
2650 printk(KERN_ERR "Unable to register minors for usb_device\n");
2651 goto out;
2652 }
2653 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2654 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2655 if (retval) {
2656 printk(KERN_ERR "Unable to get usb_device major %d\n",
2657 USB_DEVICE_MAJOR);
2658 goto error_cdev;
2659 }
2660 usb_register_notify(&usbdev_nb);
2661out:
2662 return retval;
2663
2664error_cdev:
2665 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2666 goto out;
2667}
2668
2669void usb_devio_cleanup(void)
2670{
2671 usb_unregister_notify(&usbdev_nb);
2672 cdev_del(&usb_device_cdev);
2673 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2674}