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